Flue gas pretreatment device of converter bag-type dust collector
By designing a flue gas pretreatment device, the flue gas flow rate and temperature are reduced by using a speed reduction tank and thermal conduction rod, the problems of high temperature and large-grain dust density in the converter bag dust collector are solved, extending the service life of the bag and improving the dust removal effect.
Patent Information
- Application Number
- CN202323498309.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-21
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2033-12-21
AI Technical Summary
The converter bag dust collector is easily burned through when dealing with high-temperature flue gas, and the high dust density of large particles causes severe wear of the bag, shortening the service life and affecting the dust removal effect.
A flue gas pretreatment device is designed, including a speed reduction tank, intake pipe, outlet pipe, ash discharge pipe and ash discharge valve. A flue gas cooling device and a heat conducting rod are installed in the speed reduction tank to reduce the flue gas flow rate and temperature. Promote the separation of large particles of solid suspended particles, reduce dust density, and extend the service life of the bag.
It effectively reduces the wear speed of the bag, extends the service life, and improves the dust removal effect, prevents the bag from being burned through, and enhances environmental protection.
Smart Images
Figure CN222139163U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a flue gas pretreatment device installed in front of a converter bag dust collector, belonging to the technical field of metallurgical equipment. Background Art
[0002] Dry dust removal is the mainstream of steelmaking dust removal at this stage, which is divided into bag dust removal and electric dust removal. Bag dust removal is more widely used. In actual production, the solid suspended particles in the flue gas are large, the bag wears seriously, and the service life of the bag is shortened; the converter flue gas temperature is high, and the bag is easily burned through, affecting the dust removal effect and posing a threat to the environment. Therefore, how to reduce the converter flue gas temperature and the density of large dust particles, and improve the bag dust removal effect and service life is a problem faced by relevant personnel. Utility Model Content
[0003] The utility model aims to provide a flue gas pretreatment device for a converter bag filter to improve the dust removal effect of the bag and extend the service life of the bag in view of the drawbacks of the prior art.
[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0005] A flue gas pretreatment device for a converter bag filter comprises a reduction tank, an air inlet duct, an air outlet duct, an ash discharge pipe and an ash discharge valve. An ash accumulation chamber is provided at the bottom of the reduction tank, and the ash outlet at the bottom of the ash accumulation chamber is connected to the ash discharge pipe through the ash discharge valve. The end of the air inlet duct is connected to the air inlet on the upper part of the side wall of the reduction tank to introduce the converter flue gas into the reduction tank. The air inlet end of the air outlet duct is connected to the air outlet on the upper part of the side wall of the reduction tank, and the air outlet end is connected to the bag filter. Inclined air guide plates are provided at the end of the air inlet duct and the air inlet end of the air outlet duct. The upper end of the air guide plate is fixedly connected to the edge of the top plate of the reduction tank, and the lower end is inclined toward the center line of the reduction tank.
[0006] The flue gas pretreatment device of the above-mentioned converter bag dust collector has a flue gas cooling device inside the reduction tank, and the flue gas cooling device includes a water inlet pipe, a water outlet pipe and a plurality of branch pipes. The water inlet pipe and the water outlet pipe are parallel to each other and symmetrically arranged on both sides of the center line of the reduction tank. The water inlet pipe and the water outlet pipe are connected through a plurality of branch pipes. The cooling water inlet of the water inlet pipe is connected to an external cooling water pipe, and the cooling water outlet of the water outlet pipe is connected to an external drain pipe.
[0007] In the flue gas pretreatment device of the above-mentioned converter bag filter, the upper part of the reduction tank is cylindrical or rectangular, the lower part is frustum or quadrangular, and the unit length volume of the reduction tank inner cavity is greater than the unit length volume of the intake pipe inner cavity.
[0008] In the flue gas pretreatment device of the converter bag filter, a plurality of heat conducting rods are fixed on the branch pipe.
[0009] In the flue gas pretreatment device of the converter bag filter, the lower end of the air guide plate is connected to the top plate of the reduction tank through a support rod.
[0010] In the flue gas pretreatment device of the converter bag filter, the air inlet duct and the air outlet duct are symmetrically arranged on both sides of the reduction tank.
[0011] In the flue gas pretreatment device of the converter bag filter, the heat conducting rod is a steel rod.
[0012] The utility model utilizes a deceleration tank to reduce the flue gas flow rate, promotes the separation of large solid suspended particles from the flue gas, reduces the density of large dust particles in the flue gas, reduces the wear rate of the bags, thereby extending the service life of the bags and improving the dust removal effect of the bags.
[0013] The flue gas cooling device can reduce the flue gas temperature and prevent the bags from being burned through, further extending the service life of the bags and improving the dust removal effect of the bags. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0015] Figure 1 It is a structural schematic diagram of the utility model;
[0016] Figure 2 yes Figure 1 A view in the figure.
[0017] The numbers in the figure are as follows: 1. ash discharge pipe, 2. ash unloading valve, 3. ash accumulation chamber, 4. reduction tank, 5. air outlet pipe, 6. air guide plate, 7. support rod, 8. top plate, 9. water inlet pipe, 10. branch pipe, 11. heat conduction rod, 12. water outlet pipe, 13. air inlet pipe. DETAILED DESCRIPTION
[0018] In order to overcome the shortcomings of the prior art, the utility model provides a flue gas pretreatment device for a converter bag filter to reduce the influence of flue gas temperature and large solid suspended particles on the life of the bag filter.
[0019] See also Figure 1The utility model mainly includes an ash discharge pipe 1, an ash discharge valve 2, an ash accumulation chamber 3, a speed reduction tank 4, an air outlet pipe 5, an air guide plate 6, a support rod 7, a top plate 8, an air inlet pipe 13, a water inlet pipe 9, a water outlet pipe 12, a branch pipe 10, and a heat conducting rod 11; the upper part of the speed reduction tank 4 is cylindrical or rectangular, and the lower part is a truncated cone or a quadrangular cone. The edge of the top plate 8 of the speed reduction tank 4 is welded to the top edge of the side wall of the speed reduction tank 4. The air inlet pipe 13 and the air outlet pipe 5 are symmetrically arranged on both sides of the speed reduction tank 4. The pipe 13 is connected to the air inlet on the upper part of the side wall of the reduction tank 4 to introduce the converter flue gas into the reduction tank 4. The air inlet end of the exhaust pipe 5 is connected to the air outlet on the upper part of the side wall of the reduction tank 4, and the exhaust end is connected to the bag dust collector. The water inlet pipe 9 and the water outlet pipe 12 are arranged in the lower middle part of the reduction tank 4. The water inlet pipe 9 and the water outlet pipe 12 are connected through multiple branch pipes 10. The lower part of the inner cavity of the reduction tank 4 is a truncated cone or quadrangular pyramid shaped ash accumulation chamber 3. The ash outlet at the bottom of the ash accumulation chamber 3 is connected to the ash discharge pipe 1 through an ash discharge valve 2.
[0020] See also Figure 2 The water inlet pipe 9 and the water outlet pipe 12 are parallel to each other and symmetrically arranged on both sides of the center line of the reduction tank 4. The water inlet pipe 9 and the water outlet pipe 12 are connected through a plurality of branch pipes 10, and a large number of heat conducting rods 11 are welded above and below the branch pipes 10.
[0021] The unit length volume of the inner cavity of the reduction tank 4 is much larger than the unit length volume of the inner cavity of the air intake pipe 13. Two air guide plates 6 and a plurality of support rods 7 are arranged on the inner side of the top plate 8 of the reduction tank 4. One end of the support rod 7 is connected to the air guide plate 6 and the other end is connected to the top plate 8. One end of one air guide plate 6 is welded to the upper part (top plate edge) of the connection between the reduction tank 4 and the air intake pipe 13 and the other end is connected to the support rod 7. Another end of another air guide plate 6 is welded to the upper part (top plate edge) of the connection between the reduction tank 4 and the air outlet pipe 5 and the other end is connected to the support rod 7.
[0022] During operation, the cooling water is connected to the water inlet pipe 9, and the cooling water enters the branch pipe 10 through the water inlet pipe 9 and then flows out through the water outlet pipe 12. The ash discharge valve 2 is closed, and the high-temperature converter flue gas with solid suspended particles enters the reduction tank 4 through the air inlet pipe 13. After encountering the wind guide plate 6 on the side of the air inlet pipe 13, the direction changes and it begins to flow downward. After hitting the branch pipe 10 and the heat conducting rod 11, it passes through the wind guide plate 6 on the side of the air outlet pipe 5 and enters the air outlet pipe 5, and then enters the bag filter. Due to the large diameter of the reduction tank 4, the high-temperature flue gas slows down after entering the reduction tank 4, and the large particles of solid suspended particles are blocked by the heat conducting rod 11 and the branch pipe 10. At the same time, the branch pipe 10 and the heat conducting rod 11 can take away part of the heat of the flue gas. The blocked solid suspended particles fall into the ash accumulation chamber 3. After a period of aggregation, the ash discharge valve 2 is opened to discharge the solid suspended particles through the ash discharge pipe 1. After the solid suspended particles are discharged, the ash discharge valve 2 is closed.
[0023] The utility model has the following beneficial effects:
[0024] Due to the special structure of the utility model, the utility model does not increase the wind resistance too much in the process of dust removal and cooling, and has little effect on the dust removal fan. The dense heat conduction rods and branch pipes not only cool the flue gas but also play a role in dust removal. The large-volume reduction tank reduces the wind speed of the flue gas in the reduction tank, which is convenient for the sinking of large particles of smoke and dust, and solves the problems of high temperature and high density of large particles of dust before the converter flue gas enters the bag dust collector in the prior art, thereby extending the service life of the bag and enhancing the dust removal effect.
Claims
1. A flue gas pretreatment device for a converter bag filter, characterized in that: The invention comprises a reduction tank (4), an air inlet pipe (13), an air outlet pipe (5), an ash discharge pipe (1), and an ash discharge valve (2). The reduction tank (4) is provided with an ash accumulation chamber (3) at the bottom. The ash discharge port at the bottom of the ash accumulation chamber (3) is connected to the ash discharge pipe (1) through the ash discharge valve (2). The end of the air inlet pipe (13) is connected to the air inlet at the upper part of the side wall of the reduction tank (4) to introduce converter flue gas into the reduction tank (4). The air inlet end of the air outlet pipe (5) is connected to the air outlet at the upper part of the side wall of the reduction tank (4), and the air outlet end is connected to a bag filter. Inclined air guide plates (6) are provided at the end of the air inlet pipe (13) and the air inlet end of the air outlet pipe (5). The upper end of the air guide plate (6) is fixedly connected to the edge of the top plate (8) of the reduction tank (4), and the lower end is inclined toward the center line of the reduction tank (4).
2. The flue gas pretreatment device of the converter bag filter according to claim 1 is characterized in that: A flue gas cooling device is provided inside the deceleration tank (4), and the flue gas cooling device comprises a water inlet pipe (9), a water outlet pipe (12) and a plurality of branch pipes (10). The water inlet pipe (9) and the water outlet pipe (12) are parallel to each other and symmetrically arranged on both sides of the center line of the deceleration tank (4). The water inlet pipe (9) and the water outlet pipe (12) are connected to each other through the plurality of branch pipes (10). The cooling water inlet of the water inlet pipe (9) is connected to an external cooling water pipe, and the cooling water outlet of the water outlet pipe (12) is connected to an external drainage pipe.
3. The flue gas pretreatment device of the converter bag filter according to claim 2 is characterized in that: The upper portion of the deceleration tank (4) is cylindrical or rectangular, and the lower portion is truncated cone or quadrangular cone. The volume per unit length of the inner cavity of the deceleration tank (4) is greater than the volume per unit length of the inner cavity of the air intake pipe (13).
4. The flue gas pretreatment device of the converter bag filter according to claim 3 is characterized in that: A plurality of heat conducting rods (11) are fixed on the branch pipeline (10).
5. The flue gas pretreatment device of the converter bag filter according to claim 4 is characterized in that: The lower end of the air guide plate (6) is connected to the top plate (8) of the reduction tank (4) via a support rod (7).
6. The flue gas pretreatment device for a converter bag filter according to claim 5 is characterized in that: The air inlet pipe (13) and the air outlet pipe (5) are symmetrically arranged on both sides of the reduction tank (4).
7. The flue gas pretreatment device of the converter bag filter according to claim 6 is characterized in that: The heat conducting rod (11) is a steel rod.