CN220310116U - Acid mist emission reduction system of acid washing production line - Google Patents
Acid mist emission reduction system of acid washing production line Download PDFInfo
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- CN220310116U CN220310116U CN202321649376.6U CN202321649376U CN220310116U CN 220310116 U CN220310116 U CN 220310116U CN 202321649376 U CN202321649376 U CN 202321649376U CN 220310116 U CN220310116 U CN 220310116U
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- acid
- acid mist
- condensation recovery
- tank
- recovery device
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- 239000002253 acid Substances 0.000 title claims abstract description 171
- 239000003595 mist Substances 0.000 title claims abstract description 104
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 238000005406 washing Methods 0.000 title claims abstract description 21
- 238000011084 recovery Methods 0.000 claims abstract description 55
- 238000009833 condensation Methods 0.000 claims abstract description 46
- 230000005494 condensation Effects 0.000 claims abstract description 46
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 28
- 239000010959 steel Substances 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000010521 absorption reaction Methods 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 238000000746 purification Methods 0.000 claims abstract description 5
- 229910002804 graphite Inorganic materials 0.000 claims description 32
- 239000010439 graphite Substances 0.000 claims description 32
- 238000005554 pickling Methods 0.000 claims description 32
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 31
- 239000007789 gas Substances 0.000 claims description 20
- 239000002826 coolant Substances 0.000 claims description 18
- 239000012071 phase Substances 0.000 claims description 7
- 239000007792 gaseous phase Substances 0.000 claims description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 abstract description 46
- 238000004064 recycling Methods 0.000 abstract description 5
- 238000001704 evaporation Methods 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000000498 cooling water Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 238000007789 sealing Methods 0.000 description 3
- 239000002912 waste gas Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000010963 304 stainless steel Substances 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Landscapes
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The utility model relates to an acid mist emission reduction system of an acid washing production line, which comprises an acid washing tank, a circulating tank, an acid washing purification device and an acid mist condensation recovery device, wherein an acid mist collection cover and an acid mist collection pipeline are arranged at the upper part of the acid washing tank, the acid mist collection pipeline is connected with an acid mist inlet at the bottom of the acid mist condensation recovery device, a gas phase outlet at the top of the acid mist condensation recovery device is connected with the acid washing purification device through a pipeline, the acid mist inlet at the bottom of the acid mist condensation recovery device is also connected with the circulating tank through a pipeline, and a height difference exists between the acid mist condensation recovery device and the circulating tank, so that condensed liquid acid can naturally flow into the circulating tank. According to the utility model, a set of hydrochloric acid recovery system is added before hydrochloric acid steam enters the absorption tower, most of the evaporated hydrochloric acid is recovered and recycled, and the residual small amount of the evaporated hydrochloric acid is sent into the absorption tower again to be recovered by absorption water. The recycling rate of acid washing and evaporating acid of the strip steel is improved, the acid gas discharge is reduced, and the environmental protection level is improved.
Description
Technical Field
The utility model relates to the technical field of strip steel pickling, in particular to an acid mist emission reduction system of a pickling production line.
Background
As shown in FIG. 1, the process flow chart of the hot rolled strip steel pickling process in a certain steel mill is shown, and the large-scale strip steel pickling production generally comprises 3 pickling tanks and three acid liquor circulating tanks, wherein the total working area of the acid liquor is 213-267 m 2 The strip steel advances in the acid liquor in the acid tanks in the production, and the total flow rate of the acid liquor circulation of the 3 acid tanks and the 3 acid liquor circulation tanks is 1200m 3 /h。
Because the acid liquor at the temperature of 85-87 ℃ flows at a high speed, the evaporation capacity of the hydrochloric acid per day reaches 17520 kg, the acid mist discharge system in the prior art adopts a water absorption method (shown in figure 2) in an absorption tower, the recovered hydrochloric acid per day reaches 17472 kg, the hydrochloric acid and the absorption water are conveyed to an acid regeneration room to produce new acid liquor, and 48 kg of hydrochloric acid is discharged to the atmosphere through a chimney. The amount of hydrochloric acid discharged into the atmosphere per year reaches 14400 kg calculated on 300 working days.
Disclosure of Invention
The utility model aims to provide an acid mist emission reduction system of an acid washing production line, which is characterized in that a set of hydrochloric acid recovery system is added before hydrochloric acid steam enters an absorption tower, most of evaporated hydrochloric acid can be recovered, the recovered hydrochloric acid is directly led into a circulation tank for recycling, and the residual small amount of evaporated hydrochloric acid is sent into the absorption tower again to be recovered by absorption water. The utility model improves the recycling rate of strip steel pickling evaporation acid, effectively reduces the acid gas discharge capacity and improves the environmental protection level of the strip steel pickling production line.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides an acid mist emission reduction system of pickling production line, includes pickling tank, circulation jar, pickling purifier, still includes acid mist condensation recovery unit, pickling tank upper portion is equipped with acid mist collection cover and acid mist collection pipeline, the acid mist inlet of acid mist condensation recovery unit bottom is collected to the acid mist, the gaseous phase export at acid mist condensation recovery unit top is through pipe connection pickling purifier, the acid mist inlet of acid mist condensation recovery unit bottom still passes through pipe connection circulation jar, there is the difference in height between acid mist condensation recovery unit and the circulation jar, can make the natural trickling of condensed liquid acid get into the circulation jar.
The acid mist collecting cover on the upper part of the overflow groove is connected with an acid mist collecting pipeline, and the acid mist collecting pipeline is respectively connected with a connecting pipeline between the acid mist condensing and recycling device and the circulating tank from the side face.
The acid mist condensation recovery device comprises a steel shell and a plurality of graphite pipes, wherein the graphite pipes are fixed in the steel shell, the two ends of each graphite pipe are respectively provided with an acid mist inlet and a gas phase outlet, a cooling medium channel is arranged between each graphite pipe and the steel shell, and the steel shell is provided with a cooling medium inlet and a cooling medium outlet.
The cooling medium is water.
The acid cleaning and purifying device is an acid gas absorption tower.
Compared with the prior art, the utility model has the beneficial effects that:
1. the utility model can basically realize zero emission of hydrochloric acid waste gas in pickling production. The utility model can realize more than 95% of acid gas recovery before the hydrochloric acid waste gas enters the absorption tower, and the residual small amount of hydrochloric acid waste gas can be basically purified and recovered by the absorption tower.
2. According to the utility model, in the design of the recovery device, the tube array type circulating water passes through the outside of the graphite tube, and a water gap is not required to be opened on the whole graphite, so that the graphite processing process is simple. The water quality requirement on the circulating cooling water is low, and desalted water is not needed.
3. Based on the original production system, the utility model adopts three-section recovery according to the design of the three-section pickling tank of the production line, thereby improving the overall recovery efficiency.
4. The acid liquor recovered from each section is directly led into the circulating tank of each section without adding a new storage tank for recovering the acid liquor.
5. The utility model will be about 0.5-0.6m 3 The recovered acid liquor of/h is directly led into an acid liquor circulation tank, so that the pressure for producing and supplying the regenerated acid is relieved to a certain extent. Namely, the acid washing production line can be reduced by 0.5-0.6m 3 And/h, new acid liquid supply.
Drawings
FIG. 1 is a flow chart of strip pickling.
Fig. 2 is a flow chart of a prior art evaporated acid gas recovery process.
FIG. 3 is a flow chart of the evaporated acid gas recovery treatment of the present utility model.
FIG. 4 is a schematic diagram of the acid mist condensing and recycling device in the utility model.
In the figure: 1-acid mist condensation recovery device, 2-acid gas absorption tower, 3-circulation tank, 4-overflow launder, 5-pickling tank, 6-acid mist collecting pipeline, 7-cooling medium outlet, 8-steel shell, 9-graphite pipe, 10-sealing ring, 11-acid mist inlet, 12-cooling medium inlet, 13-gas phase outlet.
Detailed Description
Embodiments of the present utility model are further described below with reference to the accompanying drawings:
as shown in fig. 3 and 4, the acid mist emission reduction system of the acid washing production line comprises an acid washing tank 5, a circulating tank 3 and an acid washing purification device, and further comprises an acid mist condensation recovery device 1, wherein an acid mist collecting cover and an acid mist collecting pipeline 6 are arranged on the upper portion of the acid washing tank 5, the acid mist collecting pipeline 6 is connected with an acid mist inlet 11 at the bottom of the acid mist condensation recovery device 1, a gas phase outlet 13 at the top of the acid mist condensation recovery device 1 is connected with the acid washing purification device through a pipeline, the acid mist inlet 11 at the bottom of the acid mist condensation recovery device 1 is connected with the circulating tank 3 through a pipeline, and a height difference exists between the acid mist condensation recovery device 1 and the circulating tank 3, so that condensed liquid acid naturally flows into the circulating tank 3.
The two sides of the pickling tank 5 are provided with overflow tanks 4, an acid mist collecting cover at the upper part of the overflow tanks 4 is connected with an acid mist collecting pipeline 6, and the acid mist collecting pipeline 6 is respectively connected with a connecting pipeline between the acid mist condensation recovery device 1 and the circulating tank 3 from the side surface.
The acid mist condensation recovery device 1 comprises a steel shell 8 and graphite pipes 9, wherein a plurality of graphite pipes 9 are fixed in the steel shell 8, two ends of each graphite pipe 9 are respectively provided with an acid mist inlet 11 and a gas phase outlet 13, a cooling medium channel is arranged between each graphite pipe 9 and the steel shell 8, and a cooling medium inlet 12 and a cooling medium outlet 7 are arranged on the steel shell 8.
The cooling medium is water.
The acid cleaning and purifying device is an acid gas absorption tower 2.
Examples:
the strip steel pickling production line of the embodiment is provided with three pickling tanks 5, and each pickling tank 5 is provided with a circulating tank 3 and provides circulating power through a pump. The both sides of every pickling tank 5 all are equipped with acidizing fluid overflow launder 4, are equipped with the acid mist collection cover that prevents acid gas excessive in the top of pickling tank 5 (including overflow launder 4), and acid mist collection cover above overflow launder 4 connects acid mist collection pipe 6, and acid mist collection pipe 6 connects acid mist condensation recovery unit 1. Each pickling tank 5 is provided with an acid mist condensation recovery device 1, and an acid mist inlet 11 at the bottom of the acid mist condensation recovery device 1 is also used as a condensed acid liquid outlet and is communicated with the corresponding circulating tank 3 through a pipeline.
The outside of the acid mist condensation recovery device 1 is a cylindrical steel shell 8. The outer diameter is 1500mm; total length 3020mm; flanges are arranged at two ends of the steel shell 8, and the outer diameter of the flanges is 1600mm; the steel shell 8 is made of 304 stainless steel.
The interior of the acid mist condensation recovery device 1 is provided with a plurality of graphite pipes 9, and the outer diameter of each graphite pipe 9 is 50 mm and the inner diameter is 30mm. The two ends of the graphite tube 9 are provided with cylindrical graphite honeycomb blocks, and the number and the inner diameter of the inner holes of the graphite honeycomb blocks are consistent with those of the graphite tube 9 and are communicated with the graphite tube 9. The cylindrical graphite honeycomb block is fixed in the steel shell 8 and a sealing ring 10 is arranged between the cylindrical graphite honeycomb block and the steel shell 8. The inner holes of the two-end cylindrical graphite honeycomb blocks are respectively used as an inlet and an outlet of acid gas, the inner holes of the graphite tubes 9 are acid gas channels, and the outside of the graphite tubes 9 is a cooling water channel.
The seal ring 10 is made of FRP material for sealing the acid vapor inlet and is connected with an external FRP pipeline.
Two ends of the steel shell 8 are respectively provided with a water gap which is used as a water inlet and a water outlet of circulating cooling water.
The acid mist condensation recovery device 1 is arranged on the operating side of the production line. The acid mist condensation recovery device 1 is uniformly and vertically installed. The acid mist inlet 11 and the cooling water inlet (cooling medium inlet 12) are below, and the gas phase outlet 13 and the cooling water outlet (cooling medium outlet 7) are above.
The hydrochloric acid steam outlets of the pickling tank 5 and the circulating tank 3 are connected with the acid mist inlet 11 of the acid mist condensation recovery device 1 through pipelines, the hydrochloric acid steam outlet pipeline of the circulating tank 3 is directly connected with the acid mist condensation recovery device 1 up and down, the acid mist collecting pipeline 6 of the pickling tank 5 is transversely connected to the side surface of the hydrochloric acid steam outlet pipeline of the circulating tank 3, and therefore the acid mist evaporated in the pickling tank 5 and the circulating tank 3 can be ensured to smoothly enter the acid mist condensation recovery device 1, and the acid liquid condensed in the acid mist condensation recovery device 1 flows back to the circulating tank 3; the gas phase outlet 13 of the acid mist condensation recovery device 1 is connected with the acid gas absorption tower 2 through a main discharge pipeline.
The cooling water inlet and the cooling water outlet of the acid mist condensation recovery device 1 are connected with a circulating water inlet main pipeline.
The working process is as follows:
the acid mist condensation recovery device 1 is filled with circulating cooling water, and the water inlet temperature is 15-26 ℃; the temperature of the discharged water is 20-35 ℃. The water pressure is 0.4-0.5 Mpa. The flow velocity of circulating water in the acid mist condensation recovery device 1 is 60m 3 /h。
The acid steam with the temperature of 80-100 ℃ in the pickling tank 5 and the circulating tank 3 enters an acid mist inlet 11 of the acid mist condensation recovery device 1 through a pipeline, more than 95% of hydrochloric acid steam in the graphite pipe 9 is condensed into acid liquor, and the condensed acid liquor flows back into the circulating tank 3 through the pipeline by means of self weight, so that recovery is realized. The residual small amount of hydrochloric acid steam enters the acid gas absorption tower 2 through a pipeline to be completely purified and recovered and then is discharged to the atmosphere.
The working principle of the acid mist condensation recovery device 1 is as follows:
the low-temperature circulating water enters from the cooling medium inlet 12 of the acid mist condensation recovery device 1, and the higher-temperature circulating water flows out from the cooling medium outlet 7 of the acid mist condensation recovery device 1. The graphite tube 9 is completely immersed in the circulating water flowing; the high-temperature acid steam is subjected to heat exchange with circulating water outside the graphite tube 9 in the graphite tube 9, and the acid steam is condensed into liquid state to flow back into the circulating tank 3, so that the recovery of hydrochloric acid is realized.
Claims (5)
1. The utility model provides an acid mist emission reduction system of pickling production line, includes pickling tank, circulation jar, pickling purifier, its characterized in that still includes acid mist condensation recovery unit, pickling tank upper portion is equipped with acid mist collection cover and acid mist collection pipeline, the acid mist inlet of acid mist condensation recovery unit bottom is connected to acid mist collection pipeline, the gaseous phase export at acid mist condensation recovery unit top is through pipe connection pickling purifier, the acid mist inlet of acid mist condensation recovery unit bottom still passes through pipe connection circulation jar, there is the difference in height between acid mist condensation recovery unit and the circulation jar, can make the liquid acid of condensation naturally flow get into the circulation jar.
2. The acid mist emission reduction system of the acid washing production line according to claim 1, wherein overflow tanks are arranged on two sides of the acid washing tank, an acid mist collecting cover on the upper portion of the overflow tank is connected with an acid mist collecting pipeline, and the acid mist collecting pipeline is respectively connected with connecting pipelines between an acid mist condensation recovery device and a circulating tank from the side face.
3. The acid mist emission reduction system of the acid washing production line according to claim 1, wherein the acid mist condensation recovery device comprises a steel shell and a plurality of graphite pipes, the graphite pipes are fixed in the steel shell, the two ends of each graphite pipe are respectively provided with an acid mist inlet and a gas phase outlet, a cooling medium channel is arranged between each graphite pipe and the steel shell, and the steel shell is provided with a cooling medium inlet and a cooling medium outlet.
4. The acid mist emission reduction system of an acid washing production line according to claim 3, wherein the cooling medium is water.
5. The acid mist emission reduction system of an acid washing production line according to claim 1, wherein the acid washing purification device is an acid gas absorption tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321649376.6U CN220310116U (en) | 2023-06-27 | 2023-06-27 | Acid mist emission reduction system of acid washing production line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321649376.6U CN220310116U (en) | 2023-06-27 | 2023-06-27 | Acid mist emission reduction system of acid washing production line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220310116U true CN220310116U (en) | 2024-01-09 |
Family
ID=89422588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321649376.6U Active CN220310116U (en) | 2023-06-27 | 2023-06-27 | Acid mist emission reduction system of acid washing production line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220310116U (en) |
-
2023
- 2023-06-27 CN CN202321649376.6U patent/CN220310116U/en active Active
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