TWI762331B - Detection device for air leakage ratio of sintering machine and detection method thereof - Google Patents

Abstract

Detection device for air leakage ratio of sintering machine and detection method thereof are provided. The detection device for air leakage ratio of sintering machine includes a sintering bed, a cover assembly, a ventilation device, a recovered hot air pipe and a wind speed detection assembly. The cover assembly is disposed above the sintering bed. The ventilation device is disposed below the sintering bed and includes a main waste air duct and a flue gas circulation duct. The recovered hot air pipe is connected to an auxiliary air supply pipe and a ventilation pipe of the cover assembly. The wind speed detection assembly is arranged at a specific position of the detection device. A detection method of the air leakage ratio detection device of the present invention can immediately and continuously detect the air leakage ratio of sintering machine equipped with the flue gas circulation duct by detecting air volume, wind speed, the moisture content of the flue gas in the main waste air duct and the flue gas circulation duct, followed by calculating with a specific formula.

Description

Air leakage rate detection device and detection method of sintering machine

The present invention relates to an air leakage rate detection device of a sintering machine, in particular to an air leakage rate detection device of a sintering machine equipped with exhaust gas circulation equipment; the present invention relates to a detection method, in particular to a detection method of an air leakage rate detection device of a sintering machine .

Based on the fact that the production of sinter through the iron ore sintering process will emit pollutants such as SO ₂ , dust, nitrogen oxides, etc., the fuel consumption accounts for about 10% to 15% of the steel production, and the sinter waste gas and sinter generated The physical heat taken away accounts for about 50% to 60% of the energy consumption of the entire sintering process. Therefore, in the prior art, an exhaust gas circulation device is installed in the sintering machine to circulate the sintering exhaust gas generated by the iron ore sintering process back to the sintering bed surface. , in order to reduce the total emission of pollutants, and save energy by recycling the sensible heat of the circulating exhaust gas and the combustion heat of the unburned materials.

The air leakage rate of the sintering machine will significantly affect the yield and energy consumption of sintered ore. The air leakage refers to the invalid air volume that does not pass through the sintered material layer and does not participate in the reaction, because the invalid air volume enters the sintering main exhaust pipe through each air leakage point The failure to pass through the sintered material surface will reduce the effective air volume of the sintered material layer, thereby reducing the output of sintered ore and wasting a large amount of electric energy. Therefore, if the air leakage rate of the sintering machine can be detected in real time, the change of the air leakage rate can be monitored at any time, and the maintenance and equipment replacement of the sintering machine can be carried out when the air leakage rate increases, which can effectively keep the sintering machine in high-efficiency operation.

In the prior art, the detection methods for the air leakage rate of the sintering machine without exhaust gas circulation equipment include: (1) Sealing method: The gap between the grate bars of the sintering machine is sealed by using a flat plate, and then the air is exhausted, and the exhausted air volume is the leakage air volume , and the ratio of the leakage air volume to the total exhaust gas volume is the air leakage rate. However, in this method, the sintering machine must be shut down and cannot be operated when the sintering machine is running, so it will affect the production of sintered ore. Air volume detection. However, this method is only limited to detecting local air leakage points, and it is not easy to find multiple air leakage points of the sintering machine. The installation amount is large and the operation is complicated. If the system operation changes, the accuracy will also be affected; (3) Gas balance calculation method : Through the change of the concentration of different components in the flue gas before and after the detected part, the relationship between the ratio of the front and rear air volume and the change of the component concentration is sought, and then the air leakage rate is calculated. However, this method requires synchronous gas sampling, which results in a large workload, long detection time, complicated operation, and inability to specifically determine the air leakage point. Therefore, it is not suitable for long-term continuous detection; and (4) material surface wind speed method: through The anemometer detects the wind speed at each point of the sintered material surface of the sintering machine to measure the total air inlet volume through the sintered material layer of the sintering machine, and the total air volume deducts the amount of water and gas increased by the wet material during the sintering process as the Effective air intake. However, because the anemometer is not easy to install in the hood with exhaust gas circulation sintering machine and the configuration of the air duct is more complicated, therefore, this method is only suitable for the sintering machine without exhaust gas circulation equipment.

The method for detecting the air leakage rate of the sintering machine based on the above is only applicable to the sintering machine without exhaust gas circulation equipment, and cannot detect the air leakage rate in real time and continuously when the sintering machine is running. Therefore, it is an urgent problem to be solved in the art to develop an air leakage rate detection device and a detection method thereof that can detect the air leakage rate of a sintering machine equipped with exhaust gas circulation equipment in real time and continuously when the sintering machine is running.

In order to solve the above-mentioned problems of the prior art, the purpose of the present invention is to provide an air leakage rate detection device for a sintering machine, by setting an anemometer at a specific position of the detection device to detect the air volume and air speed, so as to achieve real-time and continuous detection. The purpose of the air leakage rate of the sintering machine with exhaust gas circulation equipment.

Another object of the present invention is to provide a detection method for an air leakage rate detection device of a sintering machine, by adding the measured air volume, air speed and exhaust water content into a specific formula for calculation, so as to calculate the sintering in real time and continuously The air leakage rate of the machine in the sintering process.

In order to achieve the above object, the present invention provides an air leakage rate detection device for a sintering machine, comprising: a sintering bed with a feed end; a hood assembly, including an ignition hood, an annealing hood and a circulating air hood, the ignition hood, the annealing hood and the circulating air hood are respectively arranged above the sintering bed in sequence from the direction away from the feed end, And the ignition hood is communicated with a gas supply pipeline and an auxiliary air supply pipeline, and the annealing hood is communicated with a ventilation pipeline; a ventilation device, including a main exhaust gas duct and an exhaust gas circulation duct, the main exhaust gas duct and the exhaust gas circulation duct are arranged below the sintering bed; a recovery hot gas pipe in communication with an auxiliary air supply line of the ignition hood and a ventilation line of the annealing hood; and, An anemometer assembly includes a plurality of anemometers, each anemometer has a sensor, and the anemometer is arranged above a material surface on the sintering bed.

In a specific embodiment, the air leakage rate detection device of the sintering machine further includes a feeder, and the feeder is arranged at the feed end of the sintering bed.

In a specific embodiment, the wind speed detection assembly further includes a plurality of bellows, each of which is disposed below the sintering bed and above the main exhaust gas duct and the exhaust gas circulation duct.

In a specific embodiment, the wind speed detection assembly further comprises a plurality of connecting pipes, one end of each connecting pipe is respectively connected with each of the bellows, and the other end of each connecting pipe is respectively connected with the main exhaust air duct and the bellows. The exhaust gas circulation duct is connected.

In a specific embodiment, the ventilation device further includes at least one air extraction device, the at least one air extraction device is arranged at one end of the main exhaust air duct, and the anemometer is located at the at least one air extraction device and is arranged with the main exhaust gas. Between one end of the air duct, or the at least one air extraction device is arranged at one end of the exhaust gas circulating air duct, and the anemometer is located between the at least one air extraction device and one end of the exhaust gas circulating air duct.

In a specific embodiment, the number of the at least one air extraction device is two of the air extraction devices, and the two air extraction devices are respectively arranged at one end of the main exhaust gas duct and one end of the exhaust gas circulating air duct, and the The anemometer is located between the at least one air extraction device and one end of the main air circulation duct, and the anemometer is located between the at least one air extraction device and one end of the exhaust air circulation duct.

In a specific embodiment, the at least one air extraction device includes a windmill.

In a specific embodiment, the wind speed detection assembly further includes a support frame, the support frame includes a plurality of support parts, the support frame is located on a side of the circulating air hood away from the annealing hood, and the two ends of the support frame are The supporting parts are respectively arranged on both sides of the sintering bed, and a free end of the remaining supporting parts is arranged above the sintering bed; the anemometers are respectively arranged on the free ends of the supporting parts.

In a specific embodiment, the wind speed detection assembly further includes a plurality of protection rollers, each of the protection rollers is respectively arranged at the free end of each of the support parts, and the sensors of each of the anemometers are respectively located at the respective of the protection rollers. internal.

，其中，Q _F1為該主廢氣風管之總風量；Q _F2為該尾氣循環風管之總風量；Q _F3為該回收熱氣管之總風量；Q _A為該燒結床之料面的有效進風量；Q _H為該循環風罩與燒結床之縫隙間之風量；Q _{COG 燃燒產氣}為該燃氣燃燒產氣所產生之風量；Q _Bn為該燃氣燃燒之輔助空氣之風量；Q _生料H2O為該燒結生料中的含水分及結晶水所產生之蒸氣量；以及，Q _{COG_H2O}為該燃氣進行燃燒後所產生之氣態水量。 In order to achieve the above object, the present invention further provides a method for detecting the air leakage rate of a sintering machine, comprising the steps of: providing the above-mentioned air leakage rate detecting device for the sintering machine; , the air volume of the ventilation equipment includes the total air volume of the main exhaust air duct, the total air volume of the exhaust gas circulating air duct, the total air volume of the recovered hot air duct, the air volume between the circulating air hood and the sintering bed, and a gas The incoming air volume and the air volume of the auxiliary air for the combustion of the gas; Detect the effective wind speed of the material surface of the sintering bed outside the circulating air hood, to calculate the average effective air speed of the material surface of the sintered bed, and the Multiply the average effective air velocity by the area of the sintered bed to obtain the effective air intake of the material surface of the sintered bed; Detect the moisture content in a sintered raw meal and the amount of steam generated by the crystallization water and the amount of steam generated by the combustion of the gas The amount of gaseous water in

, where Q _F1 is the total air volume of the main exhaust gas duct; Q _F2 is the total air volume of the exhaust gas circulating air duct; Q _F3 is the total air volume of the recovered hot air duct; Q _A is the effective feed rate of the material surface of the sintering bed Air volume; Q _H is the air volume between the circulating hood and the sintering bed; Q _{COG combustion} gas is the air volume produced by the gas combustion; Q _Bn is _the air volume of the auxiliary air for the gas combustion; _{Feed H2O} is the water content in the sintering raw meal and the amount of steam generated by crystal water; and Q _{COG_H2O} is the gaseous water amount generated after the combustion of the gas.

The air leakage rate detection device and the detection method of the sintering machine of the present invention detect the air volume and air speed by setting the anemometer at a specific position of the detection device, and detect the moisture content of the exhaust gas in the main exhaust gas duct and the exhaust gas circulation duct , and calculate with a specific formula to achieve the purpose of real-time and continuous detection of the air leakage rate of the sintering machine equipped with exhaust gas circulation equipment.

The following describes the implementation of the present invention through specific embodiments, and those skilled in the art can understand other advantages and effects of the present invention through the contents disclosed in this specification. However, the exemplary embodiments disclosed in this disclosure are for illustrative purposes only and should not be construed as limiting the scope of the disclosure. In other words, the present invention can also be implemented or applied by other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the spirit of the present invention.

As used in the specification and the appended claims, the singular forms "a" and "the" include plural referents unless otherwise indicated herein. As used in this specification and the appended claims, the term "or" includes "and/or" unless otherwise indicated herein.

Example 1 Derivation of the formula for calculating the air leakage rate of the sintering machine

Referring to FIG. 1 , a sintering machine with exhaust gas circulation equipment includes a sintering bed 10 , a cover assembly 20 , a ventilation device 30 , a wind speed detection assembly 40 , and a recovery hot gas pipe 50 . The sintered bed 10 has a feed end 11 . The hood assembly 20 includes an ignition hood 21 , an annealing hood 22 and a circulating air hood 23 . The ignition hood 21 , the annealing hood 22 and the circulating air hood 23 are respectively arranged in sequence from the direction away from the feed end 11 . Above the sintering bed 10, the ignition cover 21 is communicated with a gas supply line and an auxiliary air supply line, and the annealing cover 22 is communicated with a ventilation line.

The ventilation device 30 includes a plurality of air boxes 31 , a plurality of connecting pipes 32 , a main exhaust air duct 33 , an exhaust gas circulating air duct 34 and two windmills 35 . Each bellows 31 is disposed below the sintered bed 10 , and each bellows 31 is connected to the main exhaust air duct 33 and the exhaust gas circulating air duct 34 through the plurality of connecting pipes 32 , respectively. The windmills 35 are respectively arranged at one end of the main exhaust air duct 33 and one end of the exhaust gas circulating air duct 34 .

The wind speed detection assembly 40 includes a support frame 41 , a plurality of protection rollers 42 , and a plurality of anemometers 43 . The support frame 41 includes a plurality of support parts 411 , and the support frame 41 is located on one side of the circulating air hood 23 away from the annealing hood 22 . The free end of the support portion 411 is disposed above the sintering bed 10 . Each protection roller 42 is disposed at the free end of the support portion 411 located above the sintering bed 10 . Each anemometer 43 has a sensor, a part of the anemometers 43 is arranged above the sintering bed 10 and the sensor is arranged inside the protection drum 42 , and the other part of the anemometers 43 is arranged on the circulating air hood 23 and the sintering bed 10, in the gas supply pipeline and the auxiliary air supply pipeline connected with the ignition cover 21, in the ventilation pipeline connected with the annealing cover 22, between the main exhaust air duct 33 and the windmill 35, and between the exhaust gas circulating air duct 34 and the windmill 35 .

The recovered hot gas pipe 50 is communicated with the auxiliary air supply pipeline of the ignition cover 21 and the ventilation pipeline of the annealing cover 22 , and an anemometer 43 is arranged in the recovered hot gas pipe 50 .

O ₂→ H ₂O CO+

O ₂→ CO ₂CH ₄+2O ₂→ CO ₂+2H ₂O C ₂H ₄+3O ₂→ 2CO ₂+2H ₂O During the iron ore sintering process, the sintered raw meal is distributed on the sintered bed 10 from the feeding port 11 and the ignition procedure is performed. Moisture and crystal water will be converted into water vapor due to the high temperature of sintering, and flow into the bellows 31 and the connecting pipe 32 along with the pumping process. Therefore, the moisture and crystal water in the sintering raw meal should be deducted from the vaporization. wind volume. In addition, the ignition process uses gas, also known as coke oven gas (COG), and is continuously ignited through auxiliary air. After COG is burned, H ₂ O and CO ₂ will be generated, so it should also be deducted By-products of COG combustion. As shown in Table 1, the typical components of COG mainly include H ₂ , CO, CH ₄ , C ₂ H ₄ , N ₂ , CO ₂ and O ₂ , among which the combustible components (H ₂ , CO, CH ₄ and C The reaction equation for combustion of ₂ H ₄ ) is shown below. H ₂ +

O ₂ → H ₂ O CO+

O ₂ → CO ₂ CH ₄ +2O ₂ → CO ₂ +2H ₂ O C ₂ H ₄ +3O ₂ → 2CO ₂ +2H ₂ O

Table 1 Typical components of COG composition Percentage (vol%) H ₂ 54.94 CO 6.27 CH ₄ 25.37 C ₂ H ₄ 3.13 N ₂ 7.96 CO ₂ 2.19 O ₂ 0.14

It is evident from the above reaction equation that consuming 1 mol of H ₂ , CH ₄ and C ₂ H ₄ will generate 1 mol, 2 mol and 2 mol of H ₂ O, respectively, based on the same pressure and temperature conditions , the gas mass is proportional to the volume, therefore, the gaseous water (Q _{COG_H2O} ) produced by COG combustion is: Q _{COG_H2O} = ((H ₂ +2×CH ₄ +2×C ₂ H ₄ )/100)×Q _COG ), where Q _COG is the flow of COG.

Figure 2 shows a schematic diagram of the water mass balance of the sintering machine during the sintering process. It can be seen from Figure 2 that: Q _L =Q _F1 -Q _H -Q _A -Q _COG -Q _F3 -Q _{raw meal H2O} , where Q _L is the invalid air intake air volume; Q _F1 is the total air volume of the main exhaust air duct 33; Q _H is the air volume between the gap between the circulating air _hood 23 and the sintering bed 10; Q _COG is the flow rate of COG; Q _F3 is the total air volume of the recovery hot gas pipe 50 ; and Q _{raw meal H2O} is the amount of steam generated by the moisture and crystallization water in the sintered raw meal. Therefore, the mass balance of water entering and leaving the sintering machine is: Q _F1 ×M _F1 %+Q _F2 ×M _F2 %=Q _F2 ×M _F2 %+Q _{raw meal H2O} + (Q _F3+ Q _H +Q _A +Q _L )× M _A %+Q _{COG_H2O} , wherein, M _F1 % is the moisture content of the exhaust gas in the main exhaust gas duct 33; Q _F2 is the total air volume of the exhaust gas circulating duct 34; M _F2 % is the moisture content of the exhaust gas in the exhaust gas circulating duct; Also, M _A % is the moisture content of the air surrounding the sintering machine system during the measurement. After sorting out the water mass balance in and out of the sintering machine, the water content in the sintered raw meal and the amount of steam generated by the crystallization water (Q _{raw meal H2O} ) can be obtained as Q _{raw meal H2O} =

及燃燒後所產生的煙氣量（G ⁰）可分別由下列式1及式2推算而得。

=4.76（0.5

H ₂+ 0.5

CO + 2

CH ₄+ 3

C ₂H ₂–O ₂）              …式1 G ⁰=（

）+0.79

…式2 Since COG enters the ignition hood 21 with the auxiliary air, the combustion reaction is carried out, and the flue gas generated by combustion passes through the sintered bed 10 and is collected by the bellows 31 and enters the main exhaust gas duct 33 and the exhaust gas circulation duct 34 . Therefore, it is necessary to analyze the proportional relationship between the amount of (COG + auxiliary air) and the amount of flue gas generated by combustion, and to estimate the amount of flue gas that actually passes through the sintering bed 10, so as to accurately calculate the air leakage rate of the subsequent sintering machine . Based on Table 1 and the above-mentioned theoretical reaction equation for combustion of combustible components, the theoretical air requirement for combustion (

and the amount of flue gas (G ⁰ ) produced after combustion can be calculated from the following equations 1 and 2, respectively.

=4.76 (0.5

H ₂ + 0.5

CO + 2

_CH4 +3

C ₂ H ₂ -O ₂ ) ... Formula 1 G ⁰ =(

)+0.79

…Formula 2

…式3 Therefore, according to the information of Equation 1, Equation 2 and excess air ratio, the following Equation 3 can be used to deduce the actual amount of flue gas (G _r ) when COG is passed into the sintering machine: G _r =G ⁰ + (excess air ratio - 1)

…Formula 3

In addition, after COG ignites the coke in the sintered raw meal, the sintering reaction is immediately initiated, and the difference between the amount of gas generated by the sintering reaction and the amount of gas consumed is the increased amount of gas. Because the sintering reaction consumes O ₂ in the air, as shown in the following reaction equation, the sintering reaction produces CO, CO ₂ , and a very small amount of SO ₂ and other gases. C＋O ₂ → CO ₂ 2C+O ₂ → 2CO C+CO ₂ → 2CO S+O ₂ → SO ₂

It can be seen from the reaction equation that 1 mol of O ₂ is needed to generate 1 mol of CO ₂ and 1 mol of SO ₂ respectively, and 1/2 mol of O ₂ is needed to generate 1 mol of CO . Based on the same pressure and temperature conditions, the gas mass is proportional to the volume, so the amount of gas increased by the sintering reaction is 1/2 of the volume of CO in the exhaust gas. However, it was found that the volume content of CO in the exhaust gas was about 0.15% to 0.7% by detecting the composition of the exhaust gas. Therefore, the amount of gas added by the sintering reaction accounted for about 0.08% to 0.35% of the volume of the exhaust gas. Since its content is very small, it can be ignored. The amount of gas added to the sintering reaction is not considered.

其中，Q _F1為主廢氣風管33之總風量；Q _F2為尾氣循環風管34之總風量；Q _F3為回收熱氣管50之總風量；Q _A為燒結床10之料面的有效進風量；Q _H為循環風罩23與燒結床10之縫隙間之風量；Q _{COG 燃燒產氣}為COG燃燒產氣所產生之風量；Q _Bn為COG燃燒之輔助空氣之風量；Q _生料H2O為燒結生料中的含水分及結晶水所產生之蒸氣量；以及，Q _{COG_H2O}為COG進行燃燒後所產生之水量。 Based on the above and referring to Figures 1 and 3, the method for detecting the air leakage rate of the sintering machine includes the following steps: S1: Detecting the air volume of the ventilation equipment entering and leaving the material surface of the sintering bed 10 during the sintering process, the air volume of the ventilation equipment is included in the arrow The total air volume of the main exhaust air duct 33 detected at P1, the total air volume of the exhaust gas circulating air duct 34 detected at the arrow P2, the total air volume of the recovery hot air duct 50 detected at the arrow P3, and the circulating air detected at the arrow P4 The air volume between the gap between the hood 23 and the sintering bed 10, the COG gas air volume detected at the arrow P5 and the air volume generated by the COG combustion are calculated from equations 1 to 3, and the COG combustion auxiliary air detected at the arrow P6. Air volume; S2: Use an anemometer to detect the effective air speed of the material surface of the sintering bed 10 outside the circulating air hood 23 to calculate the average effective air speed of the material surface of the sintering bed 10, and multiply the average effective air speed by the area of the sintering bed 10, In order to obtain the effective air intake volume of the material surface of the sintered bed 10; S3: use the flue gas moisture meter to detect the moisture content in the sintered raw meal, the amount of steam generated by the crystallization water, and the amount of water generated after the COG is burned; S4: step The values measured from S1 to S3 are sent to the computer and calculated by the following formula to obtain the air leakage rate of the sintering machine: Air leakage rate (%) =

Among them, Q _F1 is the total air volume of the main exhaust air duct 33 ; Q _F2 is the total air volume of the exhaust gas circulating air duct 34 ; Q _F3 is the total air volume of the recovered hot air duct 50 ; Q _A is the effective air inlet volume of the material surface of the sintering bed 10 ; Q _H is the air volume between the circulating air hood 23 and the sintering bed 10; Q _{COG combustion gas is the air volume produced} by COG combustion gas; Q _Bn is the air volume of the auxiliary air for COG combustion; Q _{raw meal H2O} is the sintering gas volume. The water content in the raw meal and the amount of steam produced by the crystallization water; and, Q _{COG_H2O} is the amount of water produced by the combustion of COG.

Example 2 Detection of air leakage rate of sintering machine equipped with exhaust gas circulation equipment

Referring to Fig. 3, according to the steps S1 to S4 described in Example 1, the air volume of the ventilation equipment entering and leaving the material surface of the sintered bed 10 and the material of the sintered bed 10 are detected from the 0th hour to the 24th hour of the iron ore sintering process. The effective air intake of the noodles, the water content in the sintered raw meal, the steam produced by the crystallization water, and the water produced by the combustion of COG, the measured values are shown in Table 2 and Figure 4. Finally, the values from the 0th hour to the 24th hour are respectively brought into the formula of the air leakage rate of the sintering machine in step S4, so as to calculate the air leakage rate of the sintering machine in each hour of the sintering process in real time and continuously. Table 2 From the 0th hour to the 24th hour of the iron ore sintering process, the air volume of the ventilation equipment, the effective air inlet volume of the material surface, the water content in the sintered raw meal and the steam generated by the crystallization water, and the COG generated after combustion amount of water time (hours) Q _F1 Q _F2 Q _F3 Q _Bn Q _H Q _A Q _{COG combustion gas} Q _{raw meal H2O} Q _{COG_H2O} Air leakage rate (%) 0 11681.89 6797.72 503.91 158.58 77.40 2231.10 170.51 287.38 19.25 47.05 1 11596.18 6639.00 511.38 154.75 76.90 2233.09 166.44 285.42 18.85 47.17 2 11576.75 6829.92 474.41 131.51 75.00 2242.87 142.27 285.89 16.96 46.79 3 11528.53 6560.60 460.97 122.92 76.00 2086.54 133.26 285.08 16.20 48.31 4 11538.28 7032.89 472.32 123.66 76.10 1988.05 134.08 285.26 16.30 47.56 5 11540.42 7051.99 475.73 122.55 76.80 2149.06 132.91 285.38 16.19 46.62 6 11544.12 6987.81 476.53 118.74 77.80 2122.12 128.90 285.68 15.84 46.93 7 11593.45 7112.82 470.11 116.31 77.30 1870.02 126.38 287.04 15.65 48.16 8 11523.30 7159.75 567.44 135.93 75.00 1964.74 146.96 284.22 17.44 46.81 9 11802.09 7094.09 546.66 149.57 77.00 1894.01 161.15 290.82 18.55 48.22 10 11578.33 6647.80 552.32 137.82 77.60 2140.53 148.84 285.66 17.49 47.39 11 11476.63 6758.75 538.94 123.85 78.20 1993.19 134.28 283.65 16.33 47.70 12 11447.83 6783.42 521.29 114.69 75.80 2181.82 124.65 283.42 15.46 46.62 13 11396.00 6616.59 517.30 120.87 76.00 2492.64 131.19 281.70 16.09 45.17 14 11324.96 6489.35 519.07 120.85 77.95 2134.98 131.16 279.88 16.08 47.30 15 11402.39 6315.89 520.10 117.88 75.80 2172.00 128.05 282.02 15.82 47.80 16 11562.11 6791.72 522.86 129.60 76.80 2247.27 140.40 285.45 16.95 46.54 17 11621.68 6922.98 540.94 159.57 77.00 2356.45 171.56 285.76 19.36 45.67 18 11690.11 6732.98 536.59 152.84 77.80 2017.75 164.49 287.89 18.73 48.24 19 11691.01 7298.71 540.29 141.75 78.80 2092.15 152.91 288.40 17.80 46.36 20 11678.65 7378.07 532.13 126.63 75.00 2054.95 137.10 288.82 16.47 46.40 twenty one 11609.00 7021.13 510.91 118.40 75.20 1907.43 128.55 287.37 15.80 48.03 twenty two 11579.15 6786.24 525.20 119.43 77.80 2202.77 129.59 286.58 15.86 46.84 twenty three 11570.28 6516.95 521.83 110.31 78.50 2279.08 119.91 286.96 14.90 47.11 twenty four 11579.55 6420.43 540.62 124.05 76.80 2084.60 134.33 286.48 16.16 48.39 Air volume unit: Nm ³ /min

The results show that the air leakage rate of the sintering machine equipped with exhaust gas circulation equipment is about 45% to 48%, and the value of these air leakage rates is compared with the current of the windmill of the main exhaust gas duct and the windmill of the exhaust gas circulation duct , showing a highly positive correlation. It can be seen from this that the present invention provides a device for detecting air leakage rate of a sintering machine with simple equipment and easy maintenance, and the method for detecting air leakage rate provided by the present invention is simple, time-saving and labor-saving, and can detect the sintering machine in real time and continuously. Air leakage rate during sintering process.

The above-mentioned embodiments are only illustrative to illustrate the air leakage rate detection device and the detection method of the sintering machine of the present invention, but are not intended to limit the present invention. Any person skilled in the art can modify and change the above embodiments without departing from the spirit and scope of the present invention. Therefore, the protection scope of the right of the present invention should be as set forth in the patent application scope described later.

10: Sintering bed 11: Feed end 20: Cover assembly 21: Ignition cover 22: Annealing hood 23: Circulating hood 30: Ventilation equipment 31: Bellows 32: connecting pipe 33: Main exhaust air duct 34: Exhaust gas circulation duct 35: Windmill 40: Wind speed detection components 41: Support frame 411: Support Department 42: Protect the roller 43: Anemometer 50: Recycle hot gas pipe P1: Arrow P2: Arrow P3: Arrow P4: Arrow P5: Arrow P6: Arrow S1: Step S2: Step S3: Step S4: Steps

Fig. 1 is a schematic perspective view of the air leakage rate detection device of the sintering machine of the present invention. Figure 2 is a schematic diagram of the water mass balance in the sintering process of the air leakage rate detection device of the sintering machine of the present invention. Fig. 3 is a schematic diagram of the steps of the method for detecting the air leakage rate of a sintering machine according to the present invention. FIG. 4 is a graph of the air leakage rate calculated from the 0th hour to the 24th hour in the sintering process by using the method for detecting the air leakage rate of the sintering machine of the present invention.

S1: Step

S2: Step

S3: Step

S4: Steps

Claims (10)

An air leakage rate detection device for a sintering machine, comprising: a sintering bed with a feed end; a cover body assembly, including an ignition cover, an annealing cover and a circulating air cover, the ignition cover, the annealing cover and the circulating air cover The air hoods are respectively arranged above the sintering bed in sequence from the direction away from the feed end, and the ignition hood is connected with a gas supply pipeline and an auxiliary air supply pipeline, and the annealing hood is connected with a ventilation pipeline. a ventilation device, including a main exhaust gas duct and a tail gas circulation duct, the main exhaust gas duct and the exhaust gas circulation duct are arranged below the sintering bed; a recovery hot gas duct, and an auxiliary of the ignition cover The air supply pipeline and the ventilation pipeline of the annealing cover are communicated; Several of the anemometers in the sinter bed are positioned above a level of the sinter bed. The detection device according to claim 1, further comprising a feeder, the feeder being arranged at the feed end of the sintered bed. The detection device according to claim 1, wherein the wind speed detection component further comprises a plurality of bellows, each of the bellows is disposed below the sintered bed and above the main exhaust gas duct and the exhaust gas circulation duct. The detection device according to claim 3, wherein the wind speed detection assembly further comprises a plurality of connecting pipes, one end of each connecting pipe is respectively connected with each of the bellows, and the other end of each connecting pipe is respectively connected with the main exhaust gas The air duct is connected with the exhaust gas circulating air duct. The detection device according to claim 1, wherein the ventilation device further comprises at least one air extraction device, the at least one air extraction device is disposed at one end of the main exhaust air duct, and the other anemometers in the plurality of anemometers One is located between the at least one air extraction device and one end of the main exhaust air duct, or the at least one air extraction device is arranged at one end of the exhaust gas circulating air duct, and the remaining anemometers in the plurality of anemometers are The other one is located between the at least one air extraction device and one end of the exhaust gas circulating air duct. The detection device according to claim 5, wherein the number of the at least one air extraction device is two of the air extraction devices, and the two air extraction devices are respectively arranged at one end of the main exhaust gas duct and at the end of the exhaust gas circulating air duct. one end, and one of the remaining anemometers in the plurality of anemometers is located between the at least one air extraction device and one end of the main exhaust air duct, and the other of the remaining anemometers in the plurality of anemometers The first one is located between the at least one air extraction device and one end of the exhaust gas circulating air duct. The detection device of claim 5 or 6, wherein the at least one air extraction device comprises a windmill. The detection device according to claim 6, wherein the wind speed detection assembly further comprises a support frame, the support frame includes a plurality of support parts, the support frame is located on a side of the circulating air hood away from the annealing hood, and the support The supporting parts at both ends of the frame are respectively arranged on both sides of the sintering bed, and a free end of the remaining supporting parts is arranged above the sintering bed; several anemometers in the plurality of anemometers are respectively arranged on the free end of each of the support parts. The detection device according to claim 8, wherein the wind speed detection component further comprises a plurality of protection rollers, each of the protection rollers is respectively arranged at the free end of each of the support parts, and each of the plurality of wind speed meters in the plurality of wind speed meters The sensors of the meter are respectively located inside each of the protection rollers. A method for detecting the air leakage rate of a sintering machine, comprising the steps of: providing the air leakage rate detecting device of the sintering machine according to any one of claims 1 to 9; Air volume, the air volume of the ventilation equipment includes the total air volume of the main exhaust air duct, the total air volume of the exhaust gas circulating air duct, the total air volume of the recovered hot air duct, the air volume between the circulating air hood and the sintering bed, and the The air volume of the gas inlet and the air volume of the auxiliary air for the combustion of the gas; the effective wind speed of the material surface of the sintered bed outside the circulating air hood is detected to calculate the average effective air speed of the material surface of the sintered bed, and the The average effective air velocity is multiplied by the area of the sintered bed to obtain the effective air intake of the material surface of the sintered bed; the moisture content in a sintered raw meal and the amount of steam generated by the crystallization water and the amount of steam generated by the combustion of the gas are detected. The amount of gaseous water produced; and, calculating through a formula to obtain the air leakage rate of the sintering machine, the formula is:

, where Q _F1 is the total air volume of the main exhaust gas duct; Q _F2 is the total air volume of the exhaust gas circulating air duct; Q _F3 is the total air volume of the recovered hot air duct; Q _A is the effective feed rate of the material surface of the sintering bed Air volume; Q _H is the air volume between the circulating hood and the sintering bed; Q _{COG combustion} gas is the air volume produced by the gas combustion; Q _Bn is _the air volume of the auxiliary air for the gas combustion; _{Feed H2O} is the water content in the sintering raw meal and the amount of steam generated by crystal water; and Q _{COG_H2O} is the gaseous water amount generated after the combustion of the gas.

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