CN115709029B - A sintering mixer dust removal method and system based on a double-layer screening belt - Google Patents
A sintering mixer dust removal method and system based on a double-layer screening beltInfo
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- CN115709029B CN115709029B CN202110950381.XA CN202110950381A CN115709029B CN 115709029 B CN115709029 B CN 115709029B CN 202110950381 A CN202110950381 A CN 202110950381A CN 115709029 B CN115709029 B CN 115709029B
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Abstract
一种基于双层筛分式皮带的烧结混合机除尘方法，该方法包括：1)烧结原料通过带筛孔的双层皮带(2)进行筛分，得到筛上粗粒物料和筛下细粒物料；2)筛上粗粒物料经由双层皮带(2)的上层皮带(201)输送至一次混合机(1)内，筛下细粒物料经由双层皮带(2)的下层皮带(202)输送至一次混合机(1)内；3)进入一次混合机(1)内的筛上粗粒物料和筛下细粒物料经过混匀，得到烧结一混料。本发明将传统的进料皮带改造为带筛分的双层皮带，筛分后的粗粒物料置于上层皮带上，细粒物料则落入下层皮带上，粗粒物料和细粒物料分别下料至一次混合机，进而呈现粗粒物料在上、细粒物料在下的物料分布态势，能够有效抑制下料过程中扬尘的产生。
A sintering mixer dust removal method based on a double-layer screening belt comprises the following steps: 1) sintering raw materials are screened through a double-layer belt (2) with sieve holes to obtain coarse particles on the sieve and fine particles under the sieve; 2) the coarse particles on the sieve are transported to a primary mixer (1) via an upper belt (201) of the double-layer belt (2), and the fine particles under the sieve are transported to the primary mixer (1) via a lower belt (202) of the double-layer belt (2); 3) the coarse particles on the sieve and the fine particles under the sieve are mixed to obtain a sintered mixed material. The present invention transforms a traditional feed belt into a double-layer belt with screening, wherein the screened coarse particles are placed on the upper belt, and the fine particles fall onto the lower belt. The coarse particles and the fine particles are discharged to the primary mixer respectively, thereby presenting a material distribution situation in which the coarse particles are on the top and the fine particles are on the bottom, which can effectively suppress the generation of dust during the discharge process.
Description
Technical Field
The invention relates to a dust removal process of a sintering mixer, in particular to a dust removal method and system of a sintering mixer based on a double-layer screening belt, and belongs to the technical field of sintering process equipment.
Background
The mixing process is one of the main processes of the sintering system. The mixing operation aims at firstly carefully and uniformly mixing the components in the batch to obtain the sintering ore with uniform quality, and secondly, adding water for wetting and granulating to obtain the sintering mixture with proper granularity and good air permeability. The two-stage mixing is to sequentially carry out batch materials on two devices. The main task of primary mixing is to add water for wetting and uniformly mixing, so that the moisture, granularity and components in the mixture are uniformly distributed, and when hot return ore is added, the mixture can be preheated. The secondary mixing has the function of continuous mixing, and the main task is pelletization. The granulation in the mixing process is enhanced, so that the fine particle material is adhered to the core particles to form pseudo particles with a certain granularity, the air permeability of the sintering material layer can be improved, and higher sintering productivity is obtained.
In the raw material preparation stage, quicklime (CaO) digestion technology is generally adopted, and then water is added to enable calcium oxide to react with water chemically to generate calcium hydroxide, and a large amount of heat is released in the reaction process. The process can strengthen the sintering process, raise the material temperature, reduce the over-wet phenomenon in the sintering process, and improve the balling performance of the sintering mixture. The sintering primary mixer also has the problem of serious dust pollution when the quicklime slaking process is adopted. The quicklime is digested to generate a large amount of water vapor, and the water vapor diffuses outwards and carries a large amount of dust, so that the surrounding environment is polluted. The dust is characterized by high humidity, high concentration, light specific gravity and fine particles, the part of dust-containing gas is in a saturated state, water vapor condenses into water in a pipeline, the mixture of water and dust is in a colloid state, the adhesive force is high, the dust removing pipeline is easy to block, the dust removing equipment is adhered to the dust removing equipment, the normal operation of the dust removing system is influenced, the whole dust removing system is paralyzed in a short time in severe cases, the dust-containing gas overflows, lime dust is diffused in the air, the human respiratory system is strongly stimulated, and long-term surrounding sites are covered by the white lime dust, so that the environmental hazard is serious.
At present, in order to prevent the pipeline from being blocked, a mode of arranging a water jet on an inlet pipeline of dust removing equipment from a dust removing point is mainly adopted, so that the blocking of the pipeline is relieved, but the mode has the defect of large water consumption, the pipeline blocking cannot be completely avoided, and sediment at a low point or an elbow of the pipeline needs to be cleaned regularly.
Furthermore, the dust collection equipment of choice today is mainly a wet dust collector or a combination of a wet dust collector and a wet dust collector. The highest dust removal efficiency of the wet dust remover is only 97%, if the requirement of 20mg/m 3 of emission is met, the inlet concentration requirement of the dust remover cannot be higher than 670mg/m 3, and the inlet concentration of the actual dust remover is generally 8-15 g/m 3 and is far higher than the value. Therefore, the monopolar wet dust removal cannot guarantee the emission requirement, and a double-stage wet dust remover or a series connection of the wet dust remover and the wet electric dust remover is required to guarantee the dust removal emission requirement, and the arrangement mode obviously increases the equipment cost and the floor area of a field. The existing dust removal technical scheme belongs to wet dust removal, the system maintenance workload is large, and personnel are required to clean the dust removal pipeline regularly. A large amount of sewage is generated in the operation of the wet dust removal system, the generated sewage is generally conveyed into a mixer by a sewage pump, if the water balance of the process cannot be ensured, the sewage treatment problem can be brought, and secondary pollution is possibly caused by the sewage. The adopted wet dust collector has low dust collection efficiency, and is difficult to meet the emission requirements of the prior environment protection.
Disclosure of Invention
Aiming at the adverse effect of the quicklime digestion process on primary sintering mixing in the prior art, the invention provides a sintering mixer dust removing method and system based on a double-layer screening belt. According to the invention, the traditional feeding belt is changed into the double-layer belt with the sieve holes, the sieved coarse-grain materials are placed on the upper-layer belt, and the fine-grain materials fall on the lower-layer belt, so that the coarse-grain materials are discharged through the upper-layer belt, and the fine-grain materials are discharged through the lower-layer belt, so that the grain size distribution situation of the coarse-grain materials at the upper part and the lower part of the fine-grain materials is presented when the coarse-grain materials are distributed to the primary mixer, and further, the generation of dust in the discharging process can be effectively inhibited, and the dust pollution condition of the whole system is greatly improved.
According to a first embodiment of the present invention, a sinter mixer dust removal method based on a double layer screening belt is provided.
A sintering mixer dust removal method based on a double-layer screening belt, comprising the following steps:
1) The sintering raw materials are screened by a double-layer belt with screen holes, and coarse-grain materials on the screen and fine-grain materials under the screen are obtained.
2) Coarse-grain materials on the screen are conveyed into the primary mixer through an upper layer belt of the double-layer belt, and fine-grain materials under the screen are conveyed into the primary mixer through a lower layer belt of the double-layer belt.
3) And (3) uniformly mixing the coarse-grain materials on the screen and the fine-grain materials under the screen in the primary mixer to obtain a sintered-mixed material.
Preferably, in step 2), the coarse-grained material on the upper belt is subjected to a water-jet treatment.
Preferably, in step 2), the undersize particulate material on the underlying belt is subjected to a water jet treatment.
Preferably, in step 1), the sintering material is subjected to a water spraying treatment before being screened.
Preferably, in step 3), the material during mixing is sprayed with water.
In the present invention, the method further comprises:
4) Dust-containing gas generated in the process of blanking coarse-grain materials on a screen and fine-grain materials under the screen to the primary mixer enters a dust remover through a dust removing pipeline, and the dust-containing gas is discharged to a chimney after being purified in the dust remover.
5) In the dust removal process, the sintering raw material ash collected by the dust remover is returned to the double-layer belt.
In the invention, the discharge amount L 1 of coarse-grained materials on the screen in unit time is detected, and kg/s is detected. The amount of undersize particulate material fed per unit time, L 2 kg/s, was measured. The upper limit of dust concentration in the dust-laden gas entering the dust remover is set to C max,mg/m3. The total water spray amount M, mg required for the sintering material per unit time was calculated.
Wherein D is the average particle size of the sintered mixture and is mm. k 1 is a water spray correction coefficient, and k 1 has a value of 1×10 9～5*109,m.Cmax＜1000mg/m3, preferably C max＜900mg/m3, and more preferably C max＜800mg/m3. In the calculation process of the formula, the logarithmic calculation of the upper limit C max of the dust concentration in the dust-containing gas entering the dust remover only carries out the logarithmic calculation, and the unit does not participate in the logarithmic calculation. And in unit time, the total water spraying amount for spraying water to the sintering raw material is kept not smaller than M, so that the dust concentration at the gas inlet of the dust remover is lower than C max.
In the present invention, the initial total water jet amount to the sintering material was set to be M 0 g/s. And detecting the actual water content W,% > of the sintered first mixed material at the discharge port of the primary mixer. According to the sintering condition, the target water content of the sintered mixture is set to be W 0 percent. Judging the actual water content W and the target water content W 0 of the sintered first mixed material, and adjusting the real-time total water spraying amount M 1 g/s of the sintered raw material. The method comprises the following steps:
when W < W 0, M 1＝[1+k2·(W0-W)]×M0.
When w=w 0, M 1＝M0.
When W > W 0, M 1＝[1-k3·(W-W0)]×M0.
Wherein k 2、k3 is a water spray amount adjusting constant, and the value of k 2 is 3-10. The value of k 3 is 1-8. W 0 is not more than 15%, preferably W 0 is not more than 12%, more preferably W 0 is not more than 10%.
The actual water content W of the sintered mixed material is detected in real time, and the real-time total water spraying amount of the sintered raw material is adjusted to be M 1, so that the water content of the sintered mixed material at the discharge port of the primary mixer is W 0.
Preferably, in the step 4), the dust removing pipeline is of a double-pipe structure, and dust-containing gas generated in the blanking process of coarse-grain materials on the screen and fine-grain materials under the screen enters the dust remover for treatment through an inner layer cavity of the dust removing pipeline. Meanwhile, a heat medium is introduced into the outer layer cavity of the dust removing pipeline.
Preferably, the temperature of the heat medium is higher than the dew point temperature of the dust-containing gas. Preferably, the temperature of the heat medium is 100-300 ℃, preferably 120-280 ℃, more preferably 150-250 ℃. The heat medium is hot air or hot water.
According to a second embodiment of the present invention, a sinter mixer dust removal system based on a double layer screening belt is provided.
A sinter mixer dust removal system based on a double layer screening belt or for use in the method of the first embodiment, the system comprising a primary mixer and a double layer belt. The double-layer belt comprises an upper layer belt and a lower layer belt. The discharge ends of the upper layer belt and the lower layer belt extend into the feed inlet of the primary mixer. The upper layer belt is arranged above the lower layer belt, and sieve holes are formed in the upper layer belt.
In the invention, the double-layer belt is a zigzag screening belt. The zigzag screening type belt comprises an upper layer belt arranged on the outer ring and a lower layer belt arranged on the inner ring. The discharge end of the upper layer belt and the discharge end of the lower layer belt extend into the feed inlet of the primary mixer. And the discharging end of the lower layer belt is also connected with a discharging channel. The discharge opening of the discharge channel extends towards the bottom direction of the primary mixer.
Preferably, the system comprises a first water spraying device. The first water spraying device is arranged above the upper layer belt.
Preferably, the system comprises a second water spraying device. The second water spraying device is arranged on the side part of the double-layer belt, and in the vertical direction, the second water spraying device is positioned above the lower-layer belt, preferably between the lower-layer belt and the upper-layer belt.
Preferably, the system comprises a third water spraying device. The third water spraying device is arranged above the feeding end of the upper layer belt.
Preferably, the system comprises a fourth water spraying device. The fourth water spraying device is arranged in the primary mixer.
In the present invention, the double-layer belt is preferably a zigzag belt in order to facilitate the transportation of the sintering material. The upper layer belt and the lower layer belt in the double-layer belt are complete one-circle belts, and sieve holes are formed in the upper layer belt, so that the upper layer belt and the lower layer belt form a zigzag screening belt. When the double-layer belt is a zigzag belt, the above of the upper layer belt, the above of the lower layer belt and the above of the upper layer belt are all the upper half-turn belt of the zigzag belt. As shown in fig. 3-5, the sintering material (including coarse and fine particulate material) is also conveyed by the upper two parallel (or substantially parallel) upper and lower belts in the figure.
In addition, the second water spraying device which is arranged between the lower layer belt and the upper layer belt in the vertical direction is arranged at the side part of the double-layer belt, but not just above the lower layer belt, so that the screening of the upper layer belt on the materials and the water spraying treatment of the fine materials is finished on the premise that the fine materials on the lower layer belt are not influenced and the fine materials fall into the lower layer belt after the screening are not influenced.
In the invention, the system also comprises a dust hood and a dust remover. The dust hood is arranged at the position of the feeding port of the primary mixer. A dust removal pipe led out from the dust hood is connected to a gas inlet of the dust remover. Preferably, the dust remover is a cloth bag dust remover.
Preferably, the dust removing pipeline is of a double-pipe structure. The dust removal pipeline comprises a shell and an inner container. The inner space of the inner container forms an inner layer cavity. An outer layer chamber is formed between the outer shell and the inner container. And the outer layer chamber is provided with a heat medium inlet and a heat medium outlet. Preferably, the heat medium inlet is arranged in the upstream section of the housing and the heat medium outlet is arranged in the downstream section of the housing in accordance with the dust-laden gas course.
In the invention, a coarse grain material quality detection device is arranged on an upper layer belt of the double-layer belt. The lower layer belt is provided with a fine material quality detection device. A first moisture detection device is arranged at the discharge hole of the primary mixer. The gas inlet of the dust remover is provided with a dust concentration detection device. Preferably, a second moisture detection device is arranged at the feed inlet of the primary mixer.
Preferably, the first water spraying device is provided with a first water spraying amount detecting device. The second water spraying device is provided with a second water spraying amount detection device. And a third water spraying amount detection device is arranged on the third water spraying device. And a fourth water spraying amount detection device is arranged on the fourth water spraying device.
In the present invention, the system further comprises an exhaust fan and a chimney. The gas outlet of the dust collector is connected to the chimney via a gas discharge conduit. The exhaust fan is arranged on the gas exhaust pipeline.
In the present invention, the size of the sieve holes on the upper belt is 5 to 20mm, preferably 6 to 15mm, more preferably 7 to 10mm.
The invention provides a sintering mixer dust removing method and system based on a double-layer screening type belt. Aiming at the problem of serious dust pollution of a primary sintering mixer in the prior art, the invention provides a double-layer belt with sieving which is used for reforming a traditional feeding belt. The materials are screened simultaneously in the conveying process on the double-layer belt, coarse-grain materials after screening are placed on an upper-layer belt of the double-layer belt, and fine-grain materials fall onto a lower-layer belt through sieve holes. Coarse-grain materials and fine-grain materials are respectively discharged from different positions to a primary mixer, and then the material distribution situation of the coarse-grain materials at the upper part and the lower part is presented. Generally, because the granularity is small, light in weight, often still adsorb one deck air film on its surface, prevent dust particle mutually to agglomerate, consequently be difficult for subsiding in the air, the suspension nature is big, can produce more raise dust when the fine grain material unloading promptly. In contrast, coarse-grained materials are prone to sedimentation due to their large particle size and large specific gravity, and therefore produce less dust than are fine-grained materials. Therefore, the invention screens the sintering raw materials through the double-layer belt, and the coarse grain materials and the fine grain materials after screening are respectively fed so as to realize the grain size distribution situation of the coarse grain materials at the upper part and the fine grain materials, and the coarse grain materials at the upper part can effectively inhibit the dust emission of the fine grain materials at the lower part, thereby greatly reducing the dust concentration of a primary sintering mixer system and solving the problem of serious dust pollution of the sintering mixer in the prior art.
Preferably, the invention also carries out water spraying treatment on coarse grain materials and fine grain materials respectively, namely water spraying points are arranged above the upper layer belt and on the side edges of the lower layer belt, and the water content of the coarse grain materials and the fine grain materials is respectively improved through the water spraying treatment, so that on one hand, the generation of dust in the belt conveying process of the coarse grain materials and the fine grain materials is reduced, and meanwhile, the overall water content of the materials at the feed inlet of the primary mixer is improved, and the generation of dust in the blanking process is reduced. Further preferably, the invention further adds a water spraying point above the feeding end of the double-layer belt, that is to say, the water spraying treatment is carried out before the sintering raw materials are distributed on the double-layer belt through the feeding hopper and the sintering raw materials are screened, so that the generation of dust in the process of feeding the sintering raw materials to the belt can be reduced, and meanwhile, the generation of dust in the screening process of the sintering raw materials is reduced, namely, dust pollution is relieved from the source. More preferably, the invention also provides water spraying points in the primary mixer, namely, water spraying treatment is carried out during the mixing process of coarse-grain materials and fine-grain materials in the primary mixer. The water spraying treatment in the primary mixer is mainly to continuously add water to wet and uniformly mix sintering raw materials on the basis of the water spraying treatment, so that the moisture, granularity and components in the material in the sintering mixture are uniformly distributed, the granulating requirement of the sintering process is met, and meanwhile, the generation of dust is further inhibited, so that the emission level of system dust is ensured.
According to the invention, the generation of dust in the primary mixer system for sintering can be effectively reduced based on the granule diameter blanking of the double-layer belt and the linkage water spraying of a plurality of water spraying points on the double-layer belt and in the primary mixer. In order to further ensure the emission level of system dust, coarse grain materials and fine grain materials on a double-layer belt are fed into a primary mixer, and dust-containing gas generated when the coarse grain materials and the fine grain materials are fed into a dust remover through a dust removing pipeline for dust removal treatment. Preferably, the dust removing pipeline adopts a double-pipe structure, dust-containing gas generated in the blanking process of coarse-grain materials on a screen and undersize fine-grain materials on a double-layer belt enters the dust remover for treatment through an inner layer cavity of the dust removing pipeline, and meanwhile, a heat medium is introduced into an outer layer cavity of the dust removing pipeline. Because the outer layer chamber of the dust removing pipeline is internally provided with the heat medium, the dust entering the inner layer chamber of the dust removing pipeline and the heat medium are subjected to indirect heat exchange at the moment, so that the dust temperature is improved, and is always kept above the dew point temperature of the dust-containing gas, thereby avoiding the generation of condensed water and effectively preventing hardening. Therefore, the double-pipe structure dust removing pipeline further solves the problems that the dust of the primary sintering mixer is more and the dust removing pipeline is easy to be condensed and blocked, and the dust pollution condition of the whole system is further improved. In the present invention, the dew point temperature of the dust-containing gas is about 60 ℃, and the temperature of the heat medium is higher than the dew point temperature of the dust-containing gas, for example, the temperature of the heat medium is 100 to 300 ℃, preferably 120 to 280 ℃, more preferably 150 to 250 ℃. The heat medium may be hot air (e.g., hot exhaust gas) or hot water, etc.
In the invention, linkage water spraying of a plurality of water spraying points on the double-layer belt and in the primary mixer is needed to meet the dust emission level of the primary mixer system for sintering on one hand, and the requirement of the sintering process condition is needed to be considered on the other hand, so as to meet the water content requirement of the primary mixed material for sintering. In the scheme I, the blanking amount of coarse-grain materials on a screen of a double-layer belt in unit time is detected, the blanking amount of fine-grain materials under the screen of the double-layer belt in unit time is detected, the upper limit of dust concentration in dust-containing gas entering a dust remover is set to be C max,mg/m3, and the total water spraying amount required by sintering raw materials in unit time can be accurately known through calculation by combining the average particle size of a mixed material, so that the dust concentration at a gas inlet of the dust remover is ensured to be lower than C max.
In the second scheme, the initial total water spraying amount of the sintering raw materials is set, the actual water content of the sintering first mixed material at the discharge hole of the primary mixer is detected, and the target water content of the sintering first mixed material is set to be W 0 percent. And comparing the detected actual water content of the sintered first mixed material with the target water content, and adjusting the real-time total water spraying amount of the sintering raw material, so as to ensure that the water content of the sintered first mixed material at the discharge hole of the primary mixer is W 0 (or tends to W 0).
Based on the sintering mixer dust removing method, the invention further provides a sintering mixer dust removing system based on the double-layer screening type belt. The system includes a primary mixer and a double belt. The double-layer belt is preferably a zigzag screening belt and comprises an upper layer belt arranged on the outer ring and a lower layer belt arranged on the inner ring, wherein the upper layer belt and the lower layer belt drive transmission and conveying of the upper layer belt and the lower layer belt respectively through respective rollers. The upper layer belt is provided with sieve holes, and the sintering raw materials are sieved into coarse-grain materials on the sieve (placed on the upper layer belt) and fine-grain materials below the sieve (falling on the lower layer belt) through the sieve holes. The discharge end of the upper layer belt and the discharge end of the lower layer belt extend into the feed inlet of the primary mixer. Because this bilayer belt is the back font, therefore the lower floor's belt of inner circle need connect the discharge channel at the discharge end, the discharge opening of discharge channel extends to the bottom direction of once mixing machine, and then discharges the fine particle material on the lower floor's belt to once mixing machine in. The size of the sieve holes on the upper layer belt is 5-20mm, preferably 6-15mm, and more preferably 7-10mm.
In the invention, a first water spraying device is arranged above the upper layer belt. The first water spraying device is mainly used for spraying water to coarse-grain materials screened by the double-layer belt, so that dust generated in the conveying process and the process of discharging the coarse-grain materials to the primary mixer is reduced. The side part of the double-layer belt is provided with a second water spraying device, and in the vertical direction, the second water spraying device is positioned between the lower-layer belt and the upper-layer belt. The second water spraying device is mainly used for spraying water to the fine-grained materials after double-layer belt screening, so that dust generated in the process of conveying the fine-grained materials and discharging the fine-grained materials to the primary mixer is reduced. A third water spraying device is arranged above the feeding end of the double-layer belt. The third water spraying device mainly sprays water to the sintering raw materials which are distributed on the double-layer belt and are not screened, so that the moisture content of the sintering raw materials is improved, and dust pollution is relieved from the source. A fourth water spraying device is arranged in the primary mixer. The fourth water spraying device mainly sprays water to coarse-grain materials and fine-grain materials in the mixing process, on one hand, supplementary water spraying is carried out under the condition that the water content does not meet the sintering process requirement (the water content can be detected and judged through a second water detection device arranged at the feed inlet of the primary mixer), meanwhile, the generation of dust is further reduced, and the dust pollution condition of the primary sintering mixer system is effectively improved.
The invention also comprises a dust hood and a dust remover which are arranged at the feed inlet of the primary mixer. The dust hood is connected to a gas inlet of the dust remover through a dust removing pipeline, and a gas outlet of the dust remover is sequentially connected with the exhaust fan and the chimney through a gas discharging pipeline. The dust removing pipeline is of a double-pipe structure and comprises a shell and an inner container double-layer structure. The inner space of the inner container forms an inner layer chamber, and an outer layer chamber is arranged between the inner container and the outer shell. The outer layer chamber is used for introducing a heat medium, and the inner layer chamber provides an airflow channel for dust-containing gas. In order to reduce the dust removal load of the dust remover, the heat medium introduced into the outer layer cavity does not enter the dust remover to participate in dust removal treatment, so that the outer layer cavity is provided with a heat medium inlet and a heat medium outlet. In the dust removing process, the dust-containing gas generated in the primary mixer enters the dust remover through the inner layer chamber of the dust removing pipeline to carry out purification treatment, and meanwhile, a heat medium (such as hot water or hot steam and the like) is introduced into the outer layer chamber, so that the temperature of the dust-containing gas in the dust removing pipeline is increased, the temperature of the dust-containing gas is always kept above the dew point temperature, the generation of condensed water is avoided, hardening can be effectively prevented, and the blockage of the dust removing pipeline is avoided. In order to facilitate heat exchange between the heat medium and the dust-containing gas in the inner layer chamber in the whole process of being introduced into the outer layer chamber, the heat medium inlet is arranged at the upstream section of the shell, and the heat medium outlet is arranged at the downstream section of the shell along the trend of the dust-containing gas. The dust remover is not particularly limited, and can meet the dust removal requirement, for example, the dust remover can be a cloth bag dust remover. And returning the sintering raw material ash collected by the dust remover to a feeding belt for recycling.
In the invention, a first water spraying amount detection device is arranged on the first water spraying device and is used for controlling the water spraying amount of the first water spraying device on the upper layer belt to coarse grain materials. The second water spraying device is provided with a second water spraying amount detection device for controlling the water spraying amount of the second water spraying device on the lower layer belt to the fine material. The third water spraying device is provided with a third water spraying amount detection device for controlling the water spraying amount of the third water spraying device at the feeding end of the double-layer belt. The fourth water spraying device is provided with a fourth water spraying amount detection device which is used for controlling the water spraying amount of the fourth water spraying device in the primary mixer. The first moisture detection device and the second moisture detection device are respectively arranged at the feed inlet and the discharge outlet of the primary mixer. The gas inlet of the dust remover is also provided with a dust concentration detection device. The invention carries out real-time detection on the dust concentration at the gas inlet of the dust remover, simultaneously carries out real-time detection on the water content of the material fed and discharged by the primary mixer, evaluates the mixing effect and the dust treatment condition of the primary mixer according to the real-time detection result, and adjusts the water spraying amount of each water spraying device in a linkage way according to the mixing effect, thereby effectively solving the dust pollution problem on the premise of ensuring the mixing effect, and simultaneously controlling the actual water content of the sintered mixed material to be within the target water content range of the sintering process condition.
In addition, the upper layer belt is provided with a coarse grain material quality detection device, and the lower layer belt is provided with a fine grain material quality detection device. The coarse grain material quality detection device can detect the blanking amount of coarse grain materials in unit time, and the fine grain material detection device can detect the blanking amount of fine grain materials in unit time. Based on the analysis described above, more fines will be generated and, conversely, more coarse materials will be generated and less dust will be generated. Accordingly, the water injection amounts are also different for coarse-grained and fine-grained materials. The first water spraying device arranged on the upper layer belt can also adjust the water spraying amount in real time according to the amount of coarse-grain materials. Meanwhile, the second water spraying device arranged on the lower layer belt can also carry out real-time adjustment on the water spraying amount according to the amount of the fine materials.
The invention has the requirement on the water content of the materials at the discharge port of the primary mixer according to the sintering process. The water content of the material at the discharge port of the primary mixer is less than or equal to 15 percent, preferably less than or equal to 12 percent, and more preferably less than or equal to 10 percent. The current dust concentration emission standard is in the range of 20mg/m 3, so the dust concentration of the dust-laden gas at the gas inlet of the dust remover in the present invention is <1000mg/m 3, preferably <900mg/m 3, more preferably <800mg/m 3.
Compared with the prior art, the invention has the following beneficial technical effects:
1. According to the invention, the traditional feeding belt is modified into the double-layer belt with screening, the screened coarse-grain materials are placed on the upper-layer belt, the fine-grain materials fall on the lower-layer belt, the coarse-grain materials and the fine-grain materials are respectively discharged from different positions to the primary mixer, and then the coarse-grain materials are in a material distribution situation of the upper-grain materials and the fine-grain materials, so that dust emission in the discharging process can be effectively inhibited.
2. According to the invention, a plurality of water spraying points are additionally arranged on the double-layer belt and in the primary mixer, and particularly, water spraying is respectively carried out on coarse-grain materials and fine-grain materials, so that the humidity of the materials is improved, dust pollution is relieved from the source, the generation of dust in the material distribution, material conveying and discharging processes is greatly reduced, and the dust pollution problem in a primary sintering mixing system is further improved.
3. The dust removing pipeline adopts a double-pipe structure, dust-containing gas enters the dust remover through the inner layer cavity of the dust removing pipeline for purification treatment in the dust removing process, and meanwhile, a heat medium is introduced into the outer layer cavity, so that the temperature of the dust-containing gas in the dust removing pipeline is increased, the temperature of the dust-containing gas is always kept above the dew point temperature, the generation of condensed water is avoided, hardening can be effectively prevented, and the blockage of the dust removing pipeline is avoided.
4. According to the invention, the dust concentration at the gas inlet of the dust remover is detected in real time, the blanking amount of coarse-grain materials and fine-grain materials in unit time is detected in real time, the water content of the feeding and discharging materials of the primary mixer is detected in real time, the mixing effect and the dust treatment condition of the primary mixer are evaluated according to the real-time detection result, and the water spraying amount of each water spraying device is adjusted in a linkage manner according to the mixing effect, so that the dust pollution problem is effectively solved on the premise of ensuring the mixing effect.
Drawings
FIG. 1 is a process flow diagram of a sintering mixer dust removal method based on a double-layer screening belt of the present invention;
FIG. 2 is a second process flow diagram of a sinter mixer dust removal method based on a double-layer screening belt of the invention;
FIG. 3 is a schematic diagram of a dust removal system of a sintering mixer based on a double-layer screening belt according to the present invention;
FIG. 4 is a schematic view of a double layer screening belt according to the present invention;
FIG. 5 is a left side view of a double layer screening belt and water jet apparatus of the present invention;
Fig. 6 is a schematic structural diagram of a dust removing pipe in the present invention.
Reference numerals:
1, a primary mixer, 2, a double-layer belt, 201, 202, 203, a discharging channel, 3, a dust removing pipeline, 301, 302, a outer layer chamber, 303, a shell, 304, a liner, 305, a heating medium inlet, 306, a heating medium outlet, 4, a dust remover, 5, a chimney, 601, a first water spraying device, 602, a second water spraying device, 603, a third water spraying device, 604, a fourth water spraying device, 7, a dust hood, 801, a coarse grain material quality detecting device, 802, a fine grain material quality detecting device, 901, a first water detecting device, 902, a second water detecting device, 10, a dust concentration detecting device, 1101, a first water spraying amount detecting device, 1102, a second water spraying amount detecting device, 1103, a third water spraying amount detecting device, 1104, a fourth water spraying amount detecting device, 12, an exhaust fan, 13 and a gas discharging pipeline.
Detailed Description
According to a second embodiment of the present invention, a sinter mixer dust removal system based on a double layer screening belt is provided.
A sinter mixer dust removal system based on a double layer screening belt or for use in the method of the first embodiment, the system comprising a primary mixer 1 and a double layer belt 2. The double-layered belt 2 includes an upper belt 201 and a lower belt 202. The discharge ends of the upper belt 201 and the lower belt 202 extend into the feed inlet of the primary mixer 1. The upper belt 201 is disposed above the lower belt 202, and the upper belt 201 is provided with mesh holes.
In the invention, the double-layer belt 2 is a zigzag screening belt. The zigzag screening belt comprises an upper layer belt 201 arranged on the outer ring and a lower layer belt 202 arranged on the inner ring. The discharge end of the upper belt 201 and the discharge end of the lower belt 202 extend into the feed inlet of the primary mixer 1. And the discharge end of the lower belt 202 is also connected with a discharge channel 203. The discharge opening of the discharge channel 203 extends in the direction of the bottom of the primary mixer 1.
Preferably, the system comprises a first water spraying device 601. The first water spraying device 601 is disposed above the upper belt 201.
Preferably, the system includes a second water jet 602. The second water spraying device 602 is disposed at a side of the double-layered belt 2, and the second water spraying device 602 is located above the lower belt 202, preferably between the lower belt 202 and the upper belt 201 in the vertical direction.
Preferably, the system comprises a third water spraying device 603. The third water spraying device 603 is disposed above the feeding end of the upper belt 201.
Preferably, the system includes a fourth water jet 604. The fourth water spraying device 604 is arranged in the primary mixer 1.
In the present invention, the system further comprises a dust hood 7 and a dust collector 4. The dust hood 7 is arranged at the position of the feed inlet of the primary mixer 1. The dust removal pipe 3 led out from the dust hood 7 is connected to the gas inlet of the dust remover 4. Preferably, the dust remover 4 is a bag-type dust remover.
Preferably, the dust removing pipeline 3 has a double-pipe structure. The dust removing pipe 3 includes a housing 303 and a liner 304. The inner space of the liner 304 constitutes the inner chamber 301. An outer chamber 302 is formed between the outer shell 303 and the inner container 304. The outer chamber 302 is provided with a heat medium inlet 305 and a heat medium outlet 306. Preferably, the heat medium inlet 305 is arranged in an upstream section of the housing 303 and the heat medium outlet 306 is arranged in a downstream section of the housing 303 in terms of the dust-laden gas profile.
In the invention, the upper layer belt 201 of the double layer belt 2 is provided with a coarse grain material quality detection device 801. The lower belt 202 is provided with a fine material quality detection device 802. A first moisture detection device 901 is arranged at the discharge port of the primary mixer 1. The dust concentration detection device 10 is arranged at the gas inlet of the dust remover 4. Preferably, a second moisture detecting device 902 is provided at the inlet of the primary mixer 1.
Preferably, the first water spraying device 601 is provided with a first water spraying amount detecting device 1101. The second water spraying device 602 is provided with a second water spraying amount detecting device 1102. The third water spraying device 603 is provided with a third water spraying amount detecting device 1103. The fourth water spraying device 604 is provided with a fourth water spraying amount detecting device 1104.
In the present invention, the system further comprises an exhaust fan 12 and a chimney 5. The gas outlet of the dust separator 4 is connected to the stack 5 via a gas discharge duct 13. The suction fan 12 is arranged on the gas discharge duct 13.
In the present invention, the mesh size of the upper belt 201 is 5 to 20mm, preferably 6 to 15mm, and more preferably 7 to 10mm.
Example 1
As shown in fig. 3, a sintering mixer dust removal system based on a double-layer screening belt comprises a primary mixer 1 and a double-layer belt 2. The double-layered belt 2 includes an upper belt 201 and a lower belt 202. The discharge ends of the upper belt 201 and the lower belt 202 extend into the feed inlet of the primary mixer 1. The upper belt 201 is disposed above the lower belt 202, and the upper belt 201 is provided with mesh holes.
Example 2
As shown in fig. 4, example 1 was repeated except that the double belt 2 was a zigzag screening belt. The zigzag screening belt comprises an upper layer belt 201 arranged on the outer ring and a lower layer belt 202 arranged on the inner ring. The discharge end of the upper belt 201 and the discharge end of the lower belt 202 extend into the feed inlet of the primary mixer 1. And the discharge end of the lower belt 202 is also connected with a discharge channel 203. The discharge opening of the discharge channel 203 extends in the direction of the bottom of the primary mixer 1.
Example 3
Example 2 is repeated except that the system includes a first water spraying device 601. The first water spraying device 601 is disposed above the upper belt 201.
Example 4
As shown in fig. 5, example 3 is repeated, and the system includes a second water jet 602. The second water spraying device 602 is disposed at a side of the double-layered belt 2, and in a vertical direction, the second water spraying device 602 is located between the lower belt 202 and the upper belt 201.
Example 5
Example 4 is repeated except that the system includes a third water spraying device 603. The third water spraying device 603 is disposed above the feeding end of the upper belt 201.
Example 6
Example 5 is repeated except that the system includes a fourth water jet 604. The fourth water spraying device 604 is arranged in the primary mixer 1.
Example 7
Example 6 is repeated except that the system further comprises a suction hood 7 and a dust separator 4. The dust hood 7 is arranged at the position of the feed inlet of the primary mixer 1. The dust removal pipe 3 led out from the dust hood 7 is connected to the gas inlet of the dust remover 4. The dust remover 4 is a cloth bag dust remover.
Example 8
As shown in fig. 6, example 7 is repeated except that the dust removing pipe 3 has a double pipe structure. The dust removing pipe 3 includes a housing 303 and a liner 304. The inner space of the liner 304 constitutes the inner chamber 301. An outer chamber 302 is formed between the outer shell 303 and the inner container 304. The outer chamber 302 is provided with a heat medium inlet 305 and a heat medium outlet 306. The heat medium inlet 305 is arranged in the upstream section of the housing 303 and the heat medium outlet 306 is arranged in the downstream section of the housing 303 in terms of the dust-laden gas course.
Example 9
Example 8 was repeated except that the upper belt 201 of the double-layer belt 2 was provided with coarse-grain material quality detecting means 801. The lower belt 202 is provided with a fine material quality detection device 802. A first moisture detection device 901 is arranged at the discharge port of the primary mixer 1. The dust concentration detection device 10 is arranged at the gas inlet of the dust remover 4.
Example 10
Example 9 was repeated except that a second moisture detecting means 902 was provided at the feed inlet of the primary mixer 1.
Example 11
Embodiment 10 is repeated except that the first water spraying device 601 is provided with a first water spraying amount detecting device 1101. The second water spraying device 602 is provided with a second water spraying amount detecting device 1102. The third water spraying device 603 is provided with a third water spraying amount detecting device 1103. The fourth water spraying device 604 is provided with a fourth water spraying amount detecting device 1104.
Example 12
Example 11 is repeated except that the system further comprises an exhaust fan 12 and a chimney 5. The gas outlet of the dust separator 4 is connected to the stack 5 via a gas discharge duct 13. The suction fan 12 is arranged on the gas discharge duct 13.
Example 13
Example 12 was repeated except that the size of the mesh hole on the upper belt 201 was 5mm.
Example 14
Example 12 was repeated except that the size of the mesh hole on the upper belt 201 was 8mm.
Example 15
Example 12 was repeated except that the size of the mesh hole on the upper belt 201 was 10mm.
Example 16
A sintering mixer dust removal method based on a double-layer screening belt, comprising the following steps:
1) The sintering raw material is screened by a double-layer belt 2 with screen holes, so as to obtain coarse-grain materials on the screen and fine-grain materials under the screen.
2) Coarse-grained matter on the screen is conveyed into the primary mixer 1 via the upper belt 201 of the double-deck belt 2 and fine-grained matter under the screen is conveyed into the primary mixer 1 via the lower belt 202 of the double-deck belt 2.
3) The coarse-grain material on the screen and the fine-grain material under the screen which enter the primary mixer 1 are evenly mixed to obtain a sintered-mixed material.
Example 17
A sintering mixer dust removal method based on a double-layer screening belt, comprising the following steps:
1) The sintering raw material is screened by a double-layer belt 2 with screen holes, so as to obtain coarse-grain materials on the screen and fine-grain materials under the screen.
2) Coarse-grained matter on the screen is conveyed into the primary mixer 1 via the upper belt 201 of the double-deck belt 2 and fine-grained matter under the screen is conveyed into the primary mixer 1 via the lower belt 202 of the double-deck belt 2. Meanwhile, in the material conveying process, water spraying treatment is respectively carried out on coarse-grain materials on the screen and fine-grain materials under the screen on the double-layer belt 2.
3) The coarse-grain material on the screen and the fine-grain material under the screen which enter the primary mixer 1 are evenly mixed to obtain a sintered-mixed material.
Example 18
A sintering mixer dust removal method based on a double-layer screening belt, comprising the following steps:
1) The sintering raw materials are distributed on the double-layer belt 2 through the feeding hopper, and water spraying treatment is carried out on the sintering raw materials in the distribution process. The sintering raw material is screened by a double-layer belt 2 with screen holes, so as to obtain coarse-grain materials on the screen and fine-grain materials under the screen.
2) Coarse-grained matter on the screen is conveyed into the primary mixer 1 via the upper belt 201 of the double-deck belt 2 and fine-grained matter under the screen is conveyed into the primary mixer 1 via the lower belt 202 of the double-deck belt 2. Meanwhile, in the material conveying process, water spraying treatment is respectively carried out on coarse-grain materials on the screen and fine-grain materials under the screen on the double-layer belt 2.
3) The coarse-grain material on the screen and the fine-grain material under the screen which enter the primary mixer 1 are evenly mixed to obtain a sintered-mixed material.
Example 19
A sintering mixer dust removal method based on a double-layer screening belt, comprising the following steps:
1) The sintering raw materials are distributed on the double-layer belt 2 through the feeding hopper, and water spraying treatment is carried out on the sintering raw materials in the distribution process. The sintering raw material is screened by a double-layer belt 2 with screen holes, so as to obtain coarse-grain materials on the screen and fine-grain materials under the screen.
2) Coarse-grained matter on the screen is conveyed into the primary mixer 1 via the upper belt 201 of the double-deck belt 2 and fine-grained matter under the screen is conveyed into the primary mixer 1 via the lower belt 202 of the double-deck belt 2. Meanwhile, in the material conveying process, water spraying treatment is respectively carried out on coarse-grain materials on the screen and fine-grain materials under the screen on the double-layer belt 2.
3) The coarse-grain material on the screen and the fine-grain material under the screen after the water spraying treatment are uniformly mixed in the primary mixer 1, and meanwhile, the water spraying treatment is carried out on the materials in the uniformly mixing process. And uniformly mixing the coarse-grain materials on the sieve and the fine-grain materials under the sieve to obtain a sintered-mixed material.
Example 20
A sintering mixer dust removal method based on a double-layer screening belt, comprising the following steps:
1) The sintering raw materials are distributed on the double-layer belt 2 through the feeding hopper, and water spraying treatment is carried out on the sintering raw materials in the distribution process. The sintering raw material is screened by a double-layer belt 2 with screen holes, so as to obtain coarse-grain materials on the screen and fine-grain materials under the screen.
2) Coarse-grained matter on the screen is conveyed into the primary mixer 1 via the upper belt 201 of the double-deck belt 2 and fine-grained matter under the screen is conveyed into the primary mixer 1 via the lower belt 202 of the double-deck belt 2. Meanwhile, in the material conveying process, water spraying treatment is respectively carried out on coarse-grain materials on the screen and fine-grain materials under the screen on the double-layer belt 2.
3) The coarse-grain material on the screen and the fine-grain material under the screen after the water spraying treatment are uniformly mixed in the primary mixer 1, and meanwhile, the water spraying treatment is carried out on the materials in the uniformly mixing process. And uniformly mixing the coarse-grain materials on the sieve and the fine-grain materials under the sieve to obtain a sintered-mixed material.
4) Dust-containing gas generated in the process of blanking the coarse-grain materials on the screen and the fine-grain materials under the screen into the primary mixer 1 enters the dust remover 4 through the dust removing pipeline 3, and the dust-containing gas is discharged to the chimney 5 after being purified in the dust remover 4.
5) During the dust removal process, the sintering material ash collected by the dust remover 4 is returned to the double-layer belt 2.
Example 21
Example 20 was repeated as shown in FIG. 1, except that the amount of coarse material discharged on the screen per unit time L 1 kg/s was measured. The amount of undersize particulate material fed per unit time, L 2 kg/s, was measured. The upper limit of the dust concentration in the dust-laden gas entering the dust remover 4 is set to C max,mg/m3. The total water spray amount M, mg required for the sintering material per unit time was calculated.
Wherein D is the average particle size of the sintered mixture and is mm. k 1 is a water spray amount correction coefficient, and k 1 is 2 x 10 9,m.Cmax＜800mg/m3.
And in unit time, the total water spraying amount for spraying water to the sintering raw materials is kept not smaller than M, so that the dust concentration at the gas inlet of the dust remover 4 is lower than C max.
Example 22
As shown in FIG. 2, example 20 was repeated except that the initial total water injection amount to the sintering material was set to M 0 g/s. And detecting the actual water content W,% > of the sintered first mixed material at the discharge port of the primary mixer 1. According to the sintering condition, the target water content of the sintered mixture is set to be W 0 percent. Judging the actual water content W and the target water content W 0 of the sintered first mixed material, and adjusting the real-time total water spraying amount M 1 and g/s of water spraying treatment on the sintering raw material. The method comprises the following steps:
when W < W 0, M 1＝[1+k2·(W0-W)]×M0.
When w=w 0, M 1＝M0.
When W > W 0, M 1＝[1-k3·(W-W0)]×M0.
Wherein k 2、k3 is a water spray amount adjusting constant, and the value of k 2 is 3-10. The value of k 3 is 1-8. W 0 is less than or equal to 10 percent.
The actual water content W of the sintering-mixed material is detected in real time, and the real-time total water spraying amount of the sintering raw material is adjusted to be M 1, so that the water content of the sintering-mixed material at the discharge hole of the primary mixer 1 is W 0.
Example 23
Example 20 was repeated except that in step 4), the dust removal pipe 3 had a double pipe structure, and dust-containing gas generated during the blanking process of coarse-grained material on the screen and fine-grained material under the screen was introduced into the dust remover 4 via the inner chamber 301 of the dust removal pipe 3 for treatment. At the same time, the outer layer chamber 302 of the dust removing pipe 3 is filled with a heat medium.
Example 24
Example 23 is repeated except that the temperature of the heat medium is higher than the dew point temperature of the dust-containing gas. The temperature of the heat medium was 200 ℃. The heat medium is hot exhaust gas.
Example 25
Example 23 is repeated except that the temperature of the heat medium is higher than the dew point temperature of the dust-containing gas. The temperature of the heat medium was 100 ℃. The heat medium is hot water.
Application example 1
The method described in example 21 was used for a sintering one-shot mix dust removal process to detect the amount of coarse material on the screen to be fed per unit time L 1 =3.6 kg/s. The undersize fines material was tested for a discharge amount per unit time of L 2 =2 kg/s. The upper limit of the dust concentration in the dust-laden gas entering the dust remover 4 is set to C max＝670mg/m3. The total water spray amount M, mg required for the sintering material per unit time (1 s) was calculated.
Wherein D is the average particle size of the sintered mixture, and D=8mm. k 1 is a water spray amount correction coefficient, k 1＝2×109 m.
The total water spraying amount of water spraying treatment on the sintering raw material is kept to be not less than 462.74g in unit time, so that the dust concentration at the gas inlet of the dust remover 4 is lower than C max.
Application example 2
The method described in example 22 was used for the sintering one-shot hybrid dust removal process, setting the initial total water injection to the sintering material to M 0 =680 g/s. The actual water content w=11% of the sintered-mixed material at the discharge port of the primary mixer 1 was detected. According to the sintering condition requirement, the target water content of the sintering-mixed material is set to be W 0 = 9%. Judging the actual water content W and the target water content W 0 of the sintered first mixed material, and adjusting the real-time total water spraying amount M 1 and g/s of water spraying treatment on the sintering raw material. The method comprises the following steps:
Since W > W 0, M 1＝[1-k3·(W-W0)]×M0 = 598.4g/s.
Wherein k 3 is a water spray amount adjustment constant, k 3 =6.
The real-time total water spraying amount of the sintering raw material is adjusted to 598.4g/s, so that the water content of the sintering-mixing material at the discharge port of the primary mixer 1 tends to W 0.
Application example 3
The method described in example 22 was used for the sintering one-shot hybrid dust removal process, setting the initial total water injection to the sintering material to M 0 =560 g/s. The actual water content w=9% of the sintered-mixed material at the discharge port of the primary mixer 1 was detected. According to the sintering condition requirement, the target water content of the sintering-mixed material is set to be W 0 = 9%. Judging the actual water content W and the target water content W 0 of the sintered first mixed material, and adjusting the real-time total water spraying amount M 1 and g/s of water spraying treatment on the sintering raw material. The method comprises the following steps:
Since w=w 0, M 1＝M0.
The real-time total water spraying amount of the sintering raw material is 560g/s, so that the water content of the sintering-mixing material at the discharge port of the primary mixer 1 is W 0.
Application example 4
The method described in example 22 was used for the sintering one-shot hybrid dust removal process, setting the initial total water injection to the sintering material to M 0 =500 g/s. The actual water content w=8% of the sintered-mixed material at the discharge port of the primary mixer 1 was detected. According to the sintering condition requirement, the target water content of the sintering-mixed material is set to be W 0 = 9%. Judging the actual water content W and the target water content W 0 of the sintered first mixed material, and adjusting the real-time total water spraying amount M 1 and g/s of water spraying treatment on the sintering raw material. The method comprises the following steps:
since W < W 0, M 1＝[1+k2·(W0-W)]×M0 =540 g/s.
Wherein k 2 is a water spray amount adjustment constant, k 2 =8.
The real-time total water spraying amount of the sintering raw materials is adjusted to be 540g/s, so that the water content of the sintering-mixing material at the discharge port of the primary mixer 1 is W 0.
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