Trichloropyridin-2-ol sodium production waste gas treatment device

Abstract

The utility model discloses a sodium trichloropyridinol production waste gas treatment device, and belongs to the technical field of waste gas treatment. Comprising a plurality of spray towers, a buffer liquid removal tower and a dry filter, wherein the spray towers are connected in series; the first-stage spray tower is internally and only provided with a spray unit, each stage of spray tower behind the first-stage spray tower is internally provided with a filler and a spray unit, the spray tower is internally provided with a spray unit, the lower part of the spray tower is provided with a circulating water pumping pipeline, the liquid outlet end of the circulating water pumping pipeline is connected with the spray unit, and the liquid outlet end of the circulating water pumping pipeline is connected with the spray unit. The hydrochloric acid gas in the waste gas passing through the first-stage spray tower is greatly reduced, the pressure of the subsequent spray tower can be effectively reduced, the hydrochloric acid gas in the waste gas is effectively removed after the waste gas is absorbed by the subsequent filler spray tower, particulate matters are filtered, the subsequent waste gas enters the buffer liquid removal tower, the buffer liquid removal tower buffers the waste gas, and the waste gas is purified. After the waste gas is treated by the treatment device, the waste gas reaches an emission index, and hydrochloric acid is lower than 30mg / m < 3 >; and particulate matters are lower than 5mg / m < 3 >.

Description

Technical Field

[0001] The utility model belongs to the technical field of waste gas treatment, and specifically relates to a waste gas treatment device for sodium trichloropyridinol production. Background Art

[0002] The waste gas generated during the production of sodium trichloropyridinol is mainly hydrochloric acid gas and particulate matter. Direct discharge causes serious pollution to the surrounding environment. At present, conventional waste gas treatment equipment is used for the waste gas generated during the production of sodium trichloropyridinol. When using the existing equipment to treat the waste gas, the treatment efficiency is low when spraying through the packed spray tower, and the absorption effect of hydrochloric acid is not ideal. In addition, the waste gas after the spray tower treatment directly enters the filter for treatment, and the water vapor carried in the waste gas will reduce the service life of the filter. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a sodium trichloropyridinol production waste gas treatment device, which can improve the filtering effect and prolong the service life of the filter.

[0004] The utility model solves the technical problem by adopting the following technical solution: the sodium trichloropyridinol production waste gas treatment device comprises: a spray tower, wherein a plurality of spray towers are arranged in series;

[0005] A buffer deliquescence tower, wherein the air inlet at the bottom of the buffer deliquescence tower is connected to the exhaust port of the last-stage spray tower, and a deliquescence mechanism is provided in the buffer deliquescence tower;

[0006] A dry filter, wherein the air inlet of the dry filter is connected to the air outlet at the top of the buffer deliquation tower;

[0007] The first-stage spray tower is provided with a spray unit only, and each spray tower after the first-stage spray tower is provided with a filler and a spray unit, and the filler is arranged at the lower side of the spray unit;

[0008] It also includes a circulating water pumping pipeline, the water pumping end of the circulating water pumping pipeline is connected to the lower part of the spray tower, and the liquid outlet end of the circulating water pumping pipeline is connected to the spray unit.

[0009] Preferably, the liquid removal mechanism comprises at least two layers of liquid removal plates, a plurality of liquid removal cones are provided on the lower side of the liquid removal plates, a plurality of air holes are opened on the liquid removal plates, and the air holes of adjacent liquid removal plates are staggered.

[0010] Preferably, the dry filter comprises a filter housing, in which a plate filter element, a primary filter bag and a secondary filter bag are sequentially arranged along the gas flow direction.

[0011] Preferably, it also includes an exhaust chimney, wherein an air inlet at the bottom of the exhaust chimney is connected to an exhaust port of the dry filter, and an induced draft fan is provided on the pipeline between the dry filter and the exhaust chimney.

[0012] Preferably, the lower part of the first-stage spray tower is also connected to a recovery liquid stratification device through a pipeline.

[0013] Preferably, a horizontally arranged grid plate is provided inside the recovery liquid stratification device.

[0014] Preferably, the spray tower is provided with a water supply port, which is located above the air inlet of the spray tower, wherein the liquid outlet end of the circulating water pumping pipeline of the first-stage spray tower is connected to the water supply port of the first-stage spray tower, the liquid outlet end of the circulating water pumping pipeline of the last-stage spray tower is connected to the water supply port of the previous-stage spray tower through a pipeline, and the water supply port of the last-stage spray tower is connected to the tap water pipeline.

[0015] Preferably, the spray tower comprises a primary spray tower, a secondary spray tower and a tertiary spray tower which are sequentially connected in series.

[0016] Preferably, the volume of the buffer deliquescence tower is the same as the volume of the last-stage spray tower.

[0017] Compared with the prior art, the above technical solution of the sodium trichloropyridinol production waste gas treatment device has the following beneficial effects:

[0018] The waste gas first passes through the first-stage spray tower, which absorbs water from the waste gas and preliminarily absorbs the hydrochloric acid gas in the waste gas. After passing through the first-stage spray tower, the hydrochloric acid gas in the waste gas is greatly reduced, which can effectively reduce the pressure of the subsequent spray tower. After the waste gas is absorbed by the subsequent packing spray tower, the hydrochloric acid gas in the waste gas is effectively removed, and the particulate matter is filtered. The subsequent waste gas enters the buffer deliquification tower, which buffers the waste gas and reduces the impact of the waste gas on the filter. The deliquification mechanism in the buffer deliquification tower separates the water vapor in the waste gas. Finally, the waste gas enters the dry filter to filter the particulate matter. After being treated by the treatment device, the waste gas meets the emission index, and the hydrochloric acid is less than 30mg / m 3 ; Particles less than 5mg / m 3 .

[0019] The lower part of the first-stage spray tower is also connected to a recovery liquid stratification device through a pipeline. The hydrochloric acid is mainly absorbed by the first-stage spray tower, and the hydrochloric acid and the product are recovered through the recovery liquid stratification device. The recovered solution is dilute hydrochloric acid, which can be reused in production, and the precipitate is the product, which can be sold after secondary processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the waste gas treatment device for the production of sodium trichloropyridinol.

[0021] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0022] Figure 3 Schematic diagram of the dry filter structure.

[0023] Wherein: 1. primary spray tower 2, secondary spray tower 3, tertiary spray tower 4, buffer liquid removal tower 5, dry filter 6, exhaust pipe 7, spray unit 8, filler 9, primary circulation pumping pipeline 10, secondary circulation pumping pipeline 11, tertiary circulation pumping pipeline 12, recovered liquid stratification device 13, grid plate 14, liquid removal tray 15, induced draft fan 16, liquid removal cone 17, air hole 18, filter housing 19, plate filter element 20, primary filter bag 21, secondary filter bag. DETAILED DESCRIPTION

[0024] Figures 1 to 3 This is the best embodiment of the sodium trichloropyridinol production waste gas treatment device. Figures 1 to 3 The utility model is further described.

[0025] Reference Figure 1 The sodium trichloropyridinol production waste gas treatment device comprises a spray tower, a buffer deliquation tower 4, a dry filter 5 and an exhaust pipe. The multiple spray towers are arranged in series, the air inlet at the bottom of the buffer deliquation tower 4 is connected to the exhaust port of the last spray tower, the buffer deliquation tower 4 is provided with a deliquation mechanism, the air inlet of the dry filter 5 is connected to the exhaust port at the top of the buffer deliquation tower 4; the air inlet at the bottom of the exhaust pipe 6 is connected to the exhaust port of the dry filter 5, and a draft fan 15 is provided on the pipeline between the dry filter 5 and the exhaust pipe 6.

[0026] The spray tower in this embodiment includes a first-stage spray tower 1, a second-stage spray tower 2 and a third-stage spray tower 3 which are connected in series. The first-stage spray tower 1 has and only has a spray unit 7, and the second-stage spray tower 2 and the third-stage spray tower 3 are both provided with a filler 8 and a spray unit 7, and the filler 8 is arranged at the lower side of the spray unit 7.

[0027] A circulating water pumping pipeline is provided at the lower part of the spray tower. Specifically, a primary circulating water pumping pipeline 9 is provided at the lower part of the primary spray tower 1, a secondary circulating water pumping pipeline 10 is provided at the lower part of the secondary spray tower 2, and a tertiary circulating water pumping pipeline 11 is provided at the lower part of the tertiary spray tower 3. The pumping end of each circulating water pumping pipeline is connected to the lower part of the corresponding spray tower, and the liquid outlet end of the circulating water pumping pipeline is connected to the spray unit 7.

[0028] The lower part of the first-stage spray tower is also connected to a recovery liquid stratification device 12 through a pipeline. In addition, a grid plate 13 is provided inside the recovery liquid stratification device 12. The grid plate 13 is arranged horizontally, which can reduce the shock caused by the liquid recovered by the first-stage spray tower 1 entering the recovery liquid stratification device 12, facilitate the recovery of hydrochloric acid, and avoid a large number of particles in the recovered hydrochloric acid. The hydrochloric acid and the product are recovered by the recovery liquid stratification device 12. The recovered solution is dilute hydrochloric acid, which can be reused for production, and the precipitate is the product, which can be sold after secondary processing.

[0029] The spray tower in this embodiment is provided with a water replenishment port, which is located above the air inlet of each level of the spray tower, wherein the liquid outlet end of the primary circulation pumping pipeline 9 is connected to the water replenishment port of the primary spray tower 1, and the liquid outlet end of the tertiary circulation pumping pipeline 11 of the tertiary spray tower 3 is connected to the water replenishment port of the secondary spray tower 2 through a pipeline, and the water replenishment ports of the primary spray tower 1 and the tertiary spray tower 3 are connected to the tap water pipeline.

[0030] See also Figure 2 , the volume of the buffer deliquidation tower 4 is the same as that of the three-stage spray tower 3. The deliquidation mechanism includes at least two layers of deliquidation trays 14, a plurality of deliquidation cones 16 are provided on the lower side of the deliquidation trays 14, a plurality of air holes 17 are opened on the deliquidation trays 14, and the air holes 17 of adjacent deliquidation trays 14 are arranged in a staggered manner. When the gas carrying water vapor enters the buffer deliquidation tower 4, the gas contacts the deliquidation trays 14, and the water vapor condenses at the bottom of the deliquidation trays 14 and drips downward through the deliquidation cones 16. The air holes 17 of adjacent deliquidation trays 14 are arranged in a staggered manner, thereby increasing the resistance of the gas passing through the buffer deliquidation tower 4, achieving the purpose of buffering, and improving the deliquidation effect.

[0031] See also Figure 3 The dry filter 5 includes a filter housing 18, in which a plate filter element 19, a primary filter bag 20 and a secondary filter bag 21 are sequentially arranged along the gas flow direction, and the density of the primary filter bag 20 is less than that of the secondary filter bag 21, so that the exhaust gas is fully filtered through multi-stage filtration.

[0032] The waste gas treatment process is as follows: the waste gas first passes through the first-level spray tower 1, which absorbs water on the waste gas and preliminarily absorbs the hydrochloric acid gas in the waste gas. After passing through the first-level spray tower 1, the hydrochloric acid gas in the waste gas is greatly reduced, which can effectively reduce the pressure of the subsequent spray tower. After the waste gas is absorbed by the subsequent second-level spray tower 2 and the third-level spray tower 3, the hydrochloric acid gas in the waste gas is effectively removed, and the particulate matter is filtered. The subsequent waste gas enters the buffer deliquation tower 4, which buffers the waste gas to reduce the impact of the waste gas on the filter, and the deliquation mechanism in the buffer deliquation tower 4 separates the water vapor in the waste gas. Finally, the waste gas enters the dry filter 5 to filter the particulate matter. After being treated by the treatment device, the waste gas meets the emission index, and the hydrochloric acid is less than 30mg / m 3; Particles less than 5mg / m 3 .

[0033] The above is only the preferred embodiment of the utility model, and does not limit the utility model in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.

Claims

1. A sodium trichloropyridinol production waste gas treatment device, characterized in that: include: Spray tower, multiple spray towers are arranged in series; A buffer deliquescence tower (4), wherein an air inlet at the bottom of the buffer deliquescence tower (4) is connected to an exhaust port of a last-stage spray tower, and a deliquescence mechanism is provided in the buffer deliquescence tower (4); A dry filter (5), wherein an air inlet of the dry filter (5) is connected to an exhaust port at the top of the buffer deliquescence tower (4); The first-stage spray tower has and only has a spray unit (7), and each stage of the spray tower after the first-stage spray tower is provided with a filler (8) and a spray unit (7), and the filler (8) is arranged on the lower side of the spray unit (7); It also includes a circulating water pumping pipeline, the water pumping end of the circulating water pumping pipeline is connected to the lower part of the spray tower, and the liquid outlet end of the circulating water pumping pipeline is connected to the spray unit (7).

2. The sodium trichloropyridinol production waste gas treatment device according to claim 1, characterized in that: The liquid removal mechanism comprises at least two layers of liquid removal plates (14), a plurality of liquid removal cones (16) are arranged on the lower side of the liquid removal plates (14), a plurality of air holes (17) are opened on the liquid removal plates (14), and the air holes (17) of adjacent liquid removal plates (14) are arranged in a staggered manner.

3. The sodium trichloropyridinol production waste gas treatment device according to claim 1, characterized in that: The dry filter (5) comprises a filter housing (18), in which a plate filter element (19), a primary filter bag (20) and a secondary filter bag (21) are arranged in sequence along the gas flow direction.

4. The sodium trichloropyridinol production waste gas treatment device according to claim 1, characterized in that: It also includes an exhaust pipe (6), the air inlet at the bottom of the exhaust pipe (6) is connected to the exhaust port of the dry filter (5), and an induced draft fan (15) is provided on the pipeline between the dry filter (5) and the exhaust pipe (6).

5. The sodium trichloropyridinol production waste gas treatment device according to claim 1, characterized in that: The lower part of the first-stage spray tower is also connected to a recovery liquid stratification device (12) via a pipeline.

6. The sodium trichloropyridinol production waste gas treatment device according to claim 5, characterized in that: A horizontally arranged grid plate (13) is provided on the inner side of the recovery liquid stratification device (12).

7. The sodium trichloropyridinol production waste gas treatment device according to claim 1 or 5, characterized in that: The spray tower is provided with a water replenishment port, which is located above the air inlet of the spray tower, wherein the liquid outlet end of the circulating water pumping pipeline of the first-stage spray tower is connected to the water replenishment port of the first-stage spray tower, the liquid outlet end of the circulating water pumping pipeline of the last-stage spray tower is connected to the water replenishment port of the previous-stage spray tower through a pipeline, and the water replenishment port of the last-stage spray tower is connected to the tap water pipeline.

8. The sodium trichloropyridinol production waste gas treatment device according to claim 1, characterized in that: The spray tower comprises a first-stage spray tower (1), a second-stage spray tower (2) and a third-stage spray tower (3) which are sequentially connected in series.

9. The sodium trichloropyridinol production waste gas treatment device according to claim 1, characterized in that: The volume of the buffer deliquescence tower (4) is the same as the volume of the last-stage spray tower.

Images