CN201297862Y - Dust remover for rotary kiln - Google Patents

Abstract

The utility model relates to a dust removal device for a rotary kiln, comprising: a first-stage dust collector connected with a waste gas outlet pipe, and the first-stage dust collector includes a multi-layer settling box connected to the waste gas outlet pipe, and the multi-layer settling box is automatically The bottom-up direction is arranged layer by layer to form a baffle structure, and a fan and an air volume controller are connected between the discharge port of the multi-layer settling tank and the chimney through an air flow duct. The device of the utility model can keep the dust removal gas path and the air flow rate of the rotary kiln reasonable and stable, improve the quality of the product, greatly reduce the amount of useful powder retained in the dust removal device, increase the yield of each process, and greatly reduce the production cost of re-investment. It also makes it easy to recycle useful materials, significantly reduces the cost of device maintenance and operation, prevents waste gas from affecting the workshop environment, and achieves cleanliness and compliance, thereby ensuring normal production order and operation.

Description

A rotary kiln dust removal device

technical field

The utility model relates to a kiln equipment, more specifically, the utility model relates to a kiln equipment for burning magnetic materials and parts thereof.

Background technique

At present, soft ferrite magnetic materials must be pre-fired in a rotary kiln under aerobic high-temperature conditions for the initial solid-state reaction. The granulated powder particles, whose particle size is distributed within a certain range, enter from one end of the rotary kiln, and flow out from the tail of the kiln tube after being calcined. Because some of the incoming and outgoing powder particles are broken into powder, dust will be generated during the calcination process, which will not only pollute the production and surrounding environment, but also cause material loss. In order to solve this problem, the traditional technology mostly uses bag filter and electrostatic precipitator to solve the pollution problem in this process and recover useful materials. In practice, due to the high operation and maintenance cost of electrostatic precipitator, the industry rarely adopts it. On the other hand, the bag filter with high material recovery rate and safe dust removal effect is widely used to solve the dust removal problem and material recovery in this process.

However, after long-term use of the bag filter, it has been found that the bag filter has the following major disadvantages: 1) For the bag filter, the exhaust gas of the rotary kiln has the characteristics of humidity and high viscosity, and the dust filter bag is quickly destroyed by moisture and viscosity. Large dust clogging, resulting in the failure of back blowing and cleaning, resulting in a large pressure difference on both sides of the filter bag, a significant increase in ventilation resistance, and a significant decrease in the processing air volume, which seriously affects the effect of aerobic calcination, resulting in high magnetization of pre-calcined powder Can not meet the process requirements. 2) When selecting the air volume of the fan for bag dust removal, the air volume of the exhaust fan is generally too large due to consideration of the air volume when the filter bag is not completely blocked, resulting in a large air volume and small particle size of the dust removal system before the filter bag is blocked A part of it is sucked away by the dust removal system, resulting in a large amount of dust removal fine powder. 3) Due to the variety of powder types produced by the production line, there are many types of useful raw materials that are trapped and stagnant in the bag. In order to ensure the process hygiene, the powder collected in the bag filter cannot continue to be used in this process. In the previous process, it can only be put into use after the formula is corrected. Therefore, the more powder collected in the bag filter, the higher the production cost of re-investment. 4) After the blockage of the cloth bag causes the ventilation resistance to increase, normal ventilation cannot be guaranteed, and the exhaust gas cannot be discharged in time. In addition to making some control process indicators of the pre-burned powder of the rotary kiln fail to meet the process requirements, and the exhaust gas cannot be removed in time However, it permeates inside the workshop to form air pollution, which seriously affects the normal production order and operation. 5) The clogged filter bag can only be used again after manual cleaning and drying. When cleaning the filter bag, the environmental pollution is serious and the operation labor intensity is high. 6) According to statistics, it is found that the clogging period of the dust removal filter bag of the rotary kiln is half a month, and the filter bag must be replaced within 3 months of use, and the high temperature filter bag is expensive, resulting in an increase in production and maintenance costs: each bag filter The annual maintenance and operation cost is as high as about 30,000 yuan.

In short, the dust removal problem of the rotary kiln has been plagued by the production and equipment departments of the magnetic material industry.

Contents of the invention

In view of the above-mentioned shortcomings of the prior art, the purpose of this utility model is to provide a rotary kiln dust removal device, which has the following significant advantages: it can keep the dust removal gas path and the air flow of the rotary kiln reasonable and stable, and improve the quality of the product. Significantly reduce the amount of useful powder retained in the dust removal device, increase the yield of each process, greatly reduce the cost of re-investment production, and make it easy to recycle useful materials, significantly reduce the cost of device maintenance and operation, avoid the impact of exhaust gas on the workshop environment, and achieve cleanliness. In order to ensure the normal production order and operation.

For this reason, the technical solution of the utility model is a rotary kiln dedusting device, which includes: the exhaust gas outlet pipe of the rotary kiln, a primary dust collector connected with the exhaust gas outlet pipe, an air flow pipe, a dust collector, a chimney , and the first-stage dust collector includes a multi-layer settling box directly connected to the exhaust gas outlet pipe, the multi-layer settling box is arranged layer by layer according to the direction of the airflow from bottom to top to form a baffle structure, and each layer of the settling box It includes a horizontal settling space, a longitudinal baffle plate that impels the airflow to fold down, and the adjacent layers are communicated through air holes. The dust collector includes a box door provided on the shell of each layer of settling box; the number of layers of the multi-layer settling box is 2-9 floors, a fan and an air volume controller are connected between the discharge port of the multi-layer settling tank and the chimney through an airflow duct.

The dust removal device of the utility model adopts the baffle type settling box arranged layer by layer and from bottom to top as the dust removal equipment connected to the rotary kiln, because the humidity of the exhaust gas of the rotary kiln and the characteristic of high viscosity of the powder material are used to promote The adhesion of the liquid droplets and the powder makes it easier and more for the powder to settle in the gas path of the settling box with a bottom-up baffle structure, which avoids the adhering of the rotary kiln exhaust gas in the dust bag in one fell swoop. The air path resistance of the settling box of the utility model has shortcomings such as sharp increase and fluctuation, and the separation efficiency and dust removal efficiency of useful powders are improved by means of moisture condensation and gravity sedimentation; since the air path resistance fluctuation of the settling box of the utility model is very small, the air path resistance fluctuation On the basis of the substantial reduction, the fan and air volume controller are used to control the air pressure in the kiln tube to a slight negative pressure through the air volume controller, which can ensure that the air volume of the rotary kiln is controlled more reasonably and stably: it is neither too large nor too large. It is just enough, so that it can not only improve the quality of the product, but also greatly reduce the occurrence of excessive useful powder retention in the device due to air volume fluctuations. Practice has proved that the retention of powder in each process of the device is reduced to 10% of the bag filter , thereby improving the yield of each process and greatly reducing the production cost of reinvestment; moreover, the structure of the door opened on the shell of each layer of settling tank is simple and effective, which makes the recovery operation of useful materials simple and easy, and the labor intensity is greatly reduced; The settling box made of stainless steel or glass steel can significantly reduce the maintenance and operation cost of the device. The cost calculation shows that the utility model device is only 1/3 of the bag filter; and the utility model device’s daily maintenance cost is basically zero, which greatly saves daily The cost of maintenance operation; because the utility model device makes the air volume of the rotary kiln reasonable and appropriate, the gas in the rotary kiln will not escape. The trial proves that the utility model device can ensure the air quality in the workshop and well ensure the normal production order and operation and the health of workers.

The utility model device also includes the following specific improvements:

In order to further improve the control accuracy and sensitivity of the air pressure in the kiln, ensure better product quality, workshop environment, and lower powder retention:

The air volume controller includes an electric control valve connected in series with the air flow pipeline, the electric control valve is connected to an air pressure sensor through a control circuit, and the probe of the air pressure sensor is arranged at the tail of the kiln tube of the rotary kiln.

Alternatively, the air volume controller includes a frequency converter for controlling the speed of the fan, the frequency converter is connected to an air pressure sensor through a control circuit, and the probe of the air pressure sensor is arranged at the tail of the kiln tube of the rotary kiln.

As a practical and better box structure:

The number of layers of the multi-layer settling tank is 3-5 layers. The longitudinal baffle is arranged near the air hole and before the ascending path of the lower airflow.

In the multi-layer settling box, the air holes of two adjacent layers of settling boxes are staggered from each other and are respectively located at opposite ends of the settling box.

In order to further improve the dust removal efficiency and recovery efficiency, the residual fine dust after the first stage of dust removal by the settling box can be dusted again by a simple wet dust collector to meet the national air standard emission standards:

The dust removal device also includes a wet dust collector, which is connected in series between the discharge port of the primary dust collector and the chimney.

The wet dust collector includes a water tank with automatic constant water level, an air inlet pipe, and an air outlet pipe. The lower end of the air inlet pipe is inserted into the bottom of the water tank, and the upper part of the water tank is provided with an air filter hole plate, and the upper part of the air filter hole plate is provided with an outlet connected to the chimney. Tracheal mouth.

The opening positions of the air outlet pipe and the air filter hole plate are mutually staggered.

The dust collector also includes a dust cleaning port opened on the bottom of the wet dust collector and/or on the side of the casing.

Below in conjunction with accompanying drawing and specific embodiment the utility model is described further.

Description of drawings

FIG. 1 is a schematic diagram of the overall structure of an embodiment of the device of the present invention.

Fig. 2 is the main schematic diagram of the settling tank in Fig. 1 .

FIG. 3 is a schematic partial sectional view along the line A-A of FIG. 2 .

Fig. 4 is a main schematic diagram of the wet dust collector in Fig. 1 .

FIG. 5 is a schematic partial sectional view taken along the line B-B of FIG. 4 .

Detailed ways

Fig. 1 is a schematic structural view of an embodiment of the dust removal device of the present invention. The embodiment of the dust removal device includes: the exhaust gas outlet pipe 11 of the rotary kiln 10, the primary dust collector 20 connected to the exhaust gas outlet pipe 11, the air flow pipe 30, the dust collector, and the chimney 40, and the primary dust collector 20 It includes a multi-layer settling tank 21 connected to the exhaust gas outlet pipe 11. The lower part of the lowermost layer of the settling tank 21 is provided with an inlet 21A that is directly connected to the exhaust gas outlet pipe 11. The multi-layer settling tank 21 is arranged layer by layer according to the direction of the air flow from bottom to top. Formed as a baffle structure, each layer of settling boxes 21 includes a horizontal settling space 21B, a longitudinal baffle 22 that promotes downward folding of the airflow, and adjacent layers are communicated through air holes 23, and the dust collector includes each layer of settling boxes 21 The chamber door 24 (referring to Fig. 2,3) that offers on the shell; The number of layers of this multi-layer settling tank 21 is 3, is connected with the airflow duct 30 between the discharge port 21C of the described multi-layer settling tank 21 and the described chimney. Fan 50, air volume controller. The dust removal device also includes a wet dust collector 60 connected in series between the discharge port 21C of the primary dust collector and the chimney 40 .

The air volume controller includes an electronically controlled valve 51 connected in series on the airflow duct 30, the electrically controlled valve 51 is connected to an air pressure sensor 52 through a control circuit (not shown), and the probe of the air pressure sensor 52 is located at the Describe the tail of the kiln tube of the rotary kiln.

In FIG. 1 , the downward vertical arrows in the multi-layer settling tank 21 indicate the settled powder, and the bold arrows indicate the flowing dusty waste gas.

Figures 2 and 3 show the main schematic diagram of the settling tank in Figure 1 and the partial cross-sectional schematic diagram of A-A respectively.

The number of layers of the multi-layer settling tank 21 is 3, and the shell of the 3-layer settling tank 21 is provided with a plurality of reinforcing ribs 21D in the vertical and horizontal directions. The longitudinal baffle 22 is arranged near the air hole 23 and before the ascending path of the lower airflow. In the multi-layer settling tank 21, the air holes 23 of two adjacent layers of settling tanks are staggered from each other and located at opposite ends of the settling tank 21 respectively. Offer the box door 24 as dust collector on every layer of settling box 21 shells.

Figures 4 and 5 show the main schematic diagram of the wet dust collector in Figure 1 and the partial cross-sectional schematic diagram of B-B respectively. Described wet dust collector 60 (also referring to Fig. 1 ) comprises water tank 61, air inlet pipe 62, outlet pipe mouth 63 with liquid level automatic constant device 66, and the lower end of air inlet pipe 62 is inserted into the bottom of described water tank 61, and water tank 61 top An air filter hole plate 64 is provided, and an air outlet pipe opening 63 communicating with the chimney 40 is arranged on the upper part of the air filter hole plate 64 . The opening positions of the air outlet pipe opening 63 and the air filter hole plate 64 are staggered from each other. The dust collector also includes a dust removal port 65 opened on the bottom of the wet dust collector and/or on the side of the casing.

Claims (10)

1. A dust removal device for a rotary kiln, comprising: a waste gas outlet pipe of the rotary kiln, a first-stage dust collector connected to the waste gas outlet pipe, an air flow pipe, a dust collector, and a chimney, characterized in that: the first-stage The dust collector includes a multi-layer settling box connected to the exhaust gas outlet pipe. The multi-layer settling box is arranged layer by layer according to the direction of the airflow from bottom to top to form a baffle structure. The vertical baffles are folded, and the adjacent layers are communicated through air holes. The dust collector includes a door on the shell of each layer of settling boxes; A blower fan and an air volume controller are connected between the discharge port of the layer settling box and the chimney through an airflow duct. 2. The dust removal device of the rotary kiln according to claim 1, characterized in that: the air volume controller includes an electric control valve connected in series on the air flow pipeline, the electric control valve is connected to the air pressure sensor through the control circuit, and The probe of the air pressure sensor is arranged at the tail of the kiln tube of the rotary kiln. 3. The dust removal device of the rotary kiln according to claim 1, characterized in that: the air volume controller includes a frequency converter for controlling the speed of the fan, the frequency converter is connected to the air pressure sensor through the control circuit, and the probe of the air pressure sensor is set at The kiln tube tail of the rotary kiln. 4. The dust removal device for a rotary kiln according to any one of claims 1, 2, and 3, characterized in that: the number of layers of the multi-layer settling tank is 3-5. 5. The dust removal device of the rotary kiln according to any one of claims 1, 2, and 3, characterized in that: the longitudinal baffle is arranged near the air hole and before the ascending passage of the lower airflow. 6. The dust removal device for a rotary kiln according to any one of claims 1, 2, and 3, characterized in that: in the multi-layer settling box, the air holes of two adjacent layers of settling boxes are staggered from each other and are respectively located on the opposite two sides of the settling box. end. 7. The dust removal device for a rotary kiln according to any one of claims 1, 2, and 3, characterized in that: the dust removal device also includes a wet dust collector, which is connected in series between the discharge port of the first-stage dust collector and the between the chimneys. 8. The dust removal device of the rotary kiln according to claim 7, characterized in that: the wet dust collector includes a water tank with automatic constant water level, an air inlet pipe, and an air outlet pipe, the lower end of the air inlet pipe is inserted into the bottom of the water tank, and the upper part of the water tank An air filter orifice plate is provided, and an air outlet pipe connected to the chimney is arranged on the top of the air filter orifice plate. 9. The dust removal device of the rotary kiln according to claim 8, characterized in that: the opening positions of the air outlet pipe and the orifice plate of the air filter are staggered from each other. 10. The dust removal device of the rotary kiln according to claim 8, characterized in that: the dust collector also includes a dust cleaning port opened at the bottom and/or the side of the shell of the wet dust collector.

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