A flue gas dust removal device

Abstract

This utility model relates to the technical field of flue gas treatment equipment, specifically disclosing a flue gas dust removal device, including a housing. A dust hopper is connected to the bottom of the housing, and a first valve is connected to the bottom of the dust hopper. A partition is connected to the upper part of the housing, dividing the inner cavity of the housing into an independent upper cavity and a lower cavity. Several dust collection bags are installed inside the partition. A bag-back-blowing device is installed in the upper cavity. An exhaust port is provided at the top of the housing. A lower air inlet is provided on the side of the dust hopper, connected to a second valve. A side air inlet is provided on the side of the housing, with a third valve on the side air inlet. The second valve is connected to a flue gas supply pipe, which branches into a secondary flue gas pipe connected to the third valve. A guide plate is provided at the bottom of the partition near the side air inlet. This dust removal device combines the advantages of both side and lower air inlets.

Description

Technical Field

[0001] This utility model relates to the technical field of flue gas treatment equipment, and in particular to a flue gas dust removal device. Background Technology

[0002] Flue gas from thermal power plants contains a large amount of dust, which needs to be treated by a dust collector before further desulfurization. Currently, baghouse dust collectors are commonly used to filter the dust in the flue gas. Baghouse dust collectors include two types: side-inlet and bottom-inlet. In the side-inlet type, dust-laden gas enters from the side of the baghouse and exits from the top. To prevent faster wear of the filter bags near the inlet, a guide vane is installed beside the inlet. The flue gas flows backward through the guide vane, first moving towards the bottom of the dust collector housing, and then upward towards the filter bags. The side-inlet type produces a lower upward airflow velocity, so when dust falls from the top of the dust collector into the ash hopper, it is less likely to be carried away by the flue gas and generate dust. However, because the inlet is on the side of the dust collector housing, the flue gas cannot be evenly distributed, which also leads to faster wear of the filter bags near the inlet. In the bottom-inlet type, dust-laden gas enters from the bottom of the baghouse and exits from the top. The bottom air intake method can make the dust-laden gas distribution more uniform and avoid some dust collector bags from wearing out too quickly. However, during dust cleaning, the dust settling direction is opposite to the airflow direction, which not only hinders the settling of dust, but also easily generates eddies and "secondary dust". Utility Model Content

[0003] To address the problems mentioned in the background art, the purpose of this utility model is to provide a flue gas dust removal device.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] A flue gas dust removal device includes a housing, a conical ash hopper connected to the bottom of the housing, a first valve connected to the bottom of the ash hopper, a partition plate connected to the upper part of the housing, dividing the inner cavity of the housing into an independent upper cavity and a lower cavity, the lower cavity communicating with the ash hopper, a plurality of dust collector bags installed inside the partition plate, the bag openings of the dust collector bags communicating with the upper cavity, the bag bodies of the dust collector bags located in the lower cavity, a bag back-blowing device installed in the upper cavity, and the top of the housing... The hopper is provided with an exhaust port communicating with the upper cavity. A lower air inlet is provided on the side of the ash hopper. A second valve is connected to the lower air inlet. A side air inlet is provided on the side of the housing corresponding to the lower cavity. A third valve is provided on the side air inlet. The second valve is connected to the flue pipe. A secondary flue pipe is branched on the flue pipe and is connected to the third valve. A guide plate is provided at the bottom of the partition near the side air inlet. The bottom edge of the guide plate is lower than the bottom of the dust collector bag.

[0006] Furthermore, the bag backflushing device includes several jet pipes and several pulse solenoid valves. The jet pipes are arranged horizontally in the upper cavity, and the bottom of each jet pipe is connected to several pulse solenoid valves. Each pulse solenoid valve corresponds to a certain number of dust collector bags. An air tank is installed on the outside of the housing, and each jet pipe is connected to the air tank.

[0007] Furthermore, the dust collector bag is provided with a rigid support frame inside, and the support frame is fixed to the partition.

[0008] Furthermore, the exhaust vent is connected to a fan.

[0009] Furthermore, the first valve, the second valve, and the third valve are all slide gate valves.

[0010] The beneficial effects of this utility model are as follows: When filtering flue gas dust, the second valve is opened and the third valve is closed, allowing the flue gas to enter the housing from the bottom air inlet, so that the flue gas is evenly distributed and some dust collector bags are not worn out quickly. When back-blowing the dust collector bags, the third valve is opened and the second valve is closed, allowing the flue gas to enter the housing from the side air inlet, reducing the flue gas flow rate, avoiding obstruction of dust settling and secondary dust generation. It combines the advantages of the side air inlet and bottom air inlet methods while avoiding their disadvantages. Attached Figure Description

[0011] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0012] Explanation of the attached diagram numbers: 1. Box body, 11. Partition plate, 111. Guide plate, 12. Upper cavity, 13. Lower cavity, 14. Exhaust port, 15. Side air inlet, 2. Ash hopper, 21. Lower air inlet, 3. First valve, 4. Dust collector bag, 5. Air manifold, 51. Jet pipe, 52. Pulse solenoid valve, 6. Second valve, 7. Third valve, 8. Smoke supply pipe, 81. Secondary smoke pipe, 9. Support keel, 10. Fan. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0014] like Figure 1As shown, a flue gas dust removal device includes a housing 1. A conical ash hopper 2 is connected to the bottom of the housing 1, and a first valve 3 is connected to the bottom of the ash hopper 2. A partition 11 is connected to the upper part of the housing 1, dividing the inner cavity of the housing 1 into an independent upper cavity 12 and a lower cavity 13. The lower cavity 13 is connected to the ash hopper 2. The partition 11 is provided with several mounting holes, and a dust collector bag 4 is fixed in each mounting hole. The bag opening of the dust collector bag 4 is connected to the upper cavity 12, and the bag body of the dust collector bag 4 is located in the lower cavity 13. A bag back-blowing device is installed in the upper cavity 12. The bag back-blowing device includes several jet pipes 51 and several pulse solenoid valves 52. The several jet pipes 51 are arranged horizontally in the upper cavity 12, and several pulse solenoid valves 52 are connected to the bottom of the jet pipes 51. The several pulse solenoid valves 52 correspond to several dust collector bags 4. The dust bag 4 is installed, and an air tank 5 is installed on the outside of the box 1. Several air jet pipes 51 are connected to the air tank 5. The top of the box 1 is provided with an exhaust port 14 that communicates with the upper cavity 12. The side of the ash hopper 2 is provided with a lower air inlet 21, and a second valve 6 is connected to the lower air inlet. The side of the box 1 is provided with a side air inlet 15 corresponding to the position of the lower cavity 13. A third valve 7 is provided on the side air inlet 15. The second valve 6 is connected to the smoke supply pipe 8. The smoke supply pipe 8 is branched with a secondary smoke pipe 81, which is connected to the third valve 7. A guide plate 111 is provided at the bottom of the partition plate 11 near the side air inlet 15. The guide plate 111 separates the side air inlet 15 from the dust bag 4. The bottom edge of the guide plate 111 is lower than the bottom of the dust bag 4. The guide plate 111 and the inner wall of the box 1 form a flow channel for the flue gas to flow downward.

[0015] In actual operation, when backflushing the dust collector bags 4 is not required, open the second valve 6 and close the third valve 7 to allow the flue gas to enter the housing 1 through the lower air inlet 21, ensuring even distribution of the flue gas and preventing some dust collector bags 4 from wearing out too quickly. When backflushing the dust collector bags 4 is required, open the third valve 7 and close the second valve 6 to allow the flue gas to enter the housing 1 through the side air inlet 15, reducing the flue gas velocity. At the same time, open the pulse solenoid valve 52 to spray high-pressure gas onto the dust collector bags 4 for backflushing. Since the flue gas velocity is reduced, it will not hinder dust settling and generate secondary dust.

[0016] In this embodiment, the dust collector bag 4 is provided with a rigid support keel 9 inside. The support keel 9 is fixed on the partition 11. The support keel 9 can effectively prevent the dust collector bag 4 from deforming.

[0017] In this embodiment, the exhaust port 14 is connected to the fan 10, which can increase the flow rate of the flue gas.

[0018] In this embodiment, the first valve 3, the second valve 6, and the third valve 7 are all slide gate valves, which are less prone to clogging and jamming.

[0019] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A flue gas dust removal device, comprising a housing (1), wherein a conical ash hopper (2) is connected to the bottom of the housing (1), a first valve (3) is connected to the bottom of the ash hopper (2), a partition (11) is connected to the upper part of the housing (1), the partition (11) divides the inner cavity of the housing (1) into an independent upper cavity (12) and a lower cavity (13), the lower cavity (13) is connected to the ash hopper (2), a plurality of dust collector bags (4) are installed in the partition (11), the bag openings of the dust collector bags (4) are connected to the upper cavity (12), the bag bodies of the dust collector bags (4) are located in the lower cavity (13), a bag back-blowing device is installed in the upper cavity (12), and an exhaust port (14) connected to the upper cavity (12) is provided at the top of the housing (1), characterized in that, The ash hopper (2) is provided with a lower air inlet (21) on its side, and a second valve (6) is connected to the lower air inlet. The side of the box (1) is provided with a side air inlet (15) corresponding to the position of the lower cavity (13). A third valve (7) is provided on the side air inlet (15). The second valve (6) is connected to the smoke supply pipe (8). The smoke supply pipe (8) is branched with a secondary smoke pipe (81). The secondary smoke pipe (81) is connected to the third valve (7). A guide plate (111) is provided at the bottom of the partition plate (11) near the side air inlet (15). The bottom edge of the guide plate (111) is lower than the bottom end of the dust collector bag (4).

2. The flue gas dust removal device according to claim 1, characterized in that, The bag backflushing device includes several jet pipes (51) and several pulse solenoid valves (52). Several jet pipes (51) are arranged horizontally in the upper cavity (12). Several pulse solenoid valves (52) are connected to the bottom of the jet pipes (51). Several pulse solenoid valves (52) are respectively arranged for several dust collector bags (4). An air bag (5) is installed on the outside of the housing (1). Several jet pipes (51) are all connected to the air bag (5).

3. The flue gas dust removal device according to claim 1, characterized in that, The dust collector bag (4) is provided with a rigid support keel (9) inside, and the support keel (9) is fixed on the partition (11).

4. The flue gas dust removal device according to claim 1, characterized in that, The exhaust port (14) is connected to the fan (10).

5. The flue gas dust removal device according to claim 1, characterized in that, The first valve (3), the second valve (6) and the third valve (7) are all slide gate valves.

Images