CN211612176U - Hydrogen chloride tail gas absorbing device of by-product high concentration hydrochloric acid - Google Patents
Hydrogen chloride tail gas absorbing device of by-product high concentration hydrochloric acid Download PDFInfo
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- CN211612176U CN211612176U CN201922405517.XU CN201922405517U CN211612176U CN 211612176 U CN211612176 U CN 211612176U CN 201922405517 U CN201922405517 U CN 201922405517U CN 211612176 U CN211612176 U CN 211612176U
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- absorption tower
- tail gas
- hydrochloric acid
- hydrogen chloride
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Abstract
The utility model relates to the technical field of tail gas treatment, and discloses a hydrogen chloride tail gas absorption device with a byproduct of high-concentration hydrochloric acid, which comprises a first-stage absorption tower, a second-stage absorption tower and a third-stage absorption tower, which are arranged in sequence, and is characterized in that a gas circuit conveying line and a water circuit conveying line are arranged among the first-stage absorption tower, the second-stage absorption tower and the third-stage absorption tower, and circulating drip washing mechanisms are arranged in the three groups of absorption towers; this hydrogen chloride tail gas absorbing device is effectively guaranteeing the condition that the tail gas discharge to reach standard, does not use liquid caustic soda or lime wash etc. to do the absorption liquid, has reduced the tail gas and has dealt with the cost, does not produce and contain salt waste water and does not cause secondary pollution, and the wider economic value of byproduct hydrochloric acid usage that can obtain higher concentration is higher.
Description
Technical Field
The utility model relates to a tail gas treatment technical field, concretely relates to hydrogen chloride tail gas absorbing device of by-product high concentration hydrochloric acid.
Background
The hydrogen chloride is a strong acid, has extremely strong volatility when the concentration is high, and can be combined with water vapor in the air to generate small drops of hydrochloric acid to form acid mist. And the hydrochloric acid has extremely strong corrosivity to materials such as carbon steel, 304 stainless steel and the like. The raw material hydrochloric acid is often needed in the production of chemical products, but when the hydrochloric acid is loaded and unloaded, a part of chemical production processes (such as chloroacetic acid and the like) can generate tail gas containing hydrogen chloride.
The existing method for removing the tail gas containing the hydrogen chloride mainly adopts modes of alkali liquor spraying absorption, water spraying absorption and the like, wherein the alkali liquor spraying absorption: the use of lye or limewater, the raw materials require a portion of the cost; a large amount of salt-containing wastewater is generated in the treatment process, and needs desalting treatment, so that the energy consumption is increased. And water spray absorption: the byproduct hydrochloric acid is generally 20-25% of dilute hydrochloric acid, so the economic value is low, and if the concentration of the byproduct hydrochloric acid is controlled to be about 30%, the emission tail gas is difficult to control to reach the standard.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model aims to provide a hydrogen chloride tail gas absorbing device of by-product high concentration hydrochloric acid, this hydrogen chloride tail gas absorbing device is effectively guaranteeing the condition of tail gas discharge to reach standard, does not use liquid caustic soda or lime wash etc. to be the absorption liquid, has reduced tail gas and has dealt with the cost, does not produce and contains salt waste water and does not cause secondary pollution, and the wider economic value of by-product hydrochloric acid usage that can obtain higher concentration is higher.
In order to achieve the above object, the present invention provides the following technical solutions:
the utility model provides a hydrogen chloride tail gas absorbing device of by-product high concentration hydrochloric acid, includes one-level absorption tower, second grade absorption tower and tertiary absorption tower, and the three arranges the setting in proper order, its characterized in that, be equipped with gas circuit transfer chain and water route transfer chain between one-level absorption tower, second grade absorption tower and tertiary absorption tower, and all be equipped with circulation drip washing mechanism in three absorption towers.
Preferably, the gas circuit conveying line is a gas pipeline for conveying tail gas from the gas outlet of the first-stage absorption tower to the gas outlet of the second-stage absorption tower and from the gas outlet of the second-stage absorption tower to the gas outlet of the third-stage absorption tower, and the gas outlet on the third-stage absorption tower is connected with the gas discharging pipeline.
Preferably, the water path conveying line is a pipeline for conveying the leacheate from the third-stage absorption tower to the second-stage absorption tower and from the second-stage absorption tower to the first-stage absorption tower.
Preferably, the circulating leaching mechanism comprises at least one group of distributors and water pumps, wherein the distributors are arranged at the middle upper part of the absorption tower, and the water pumps are connected to the lower leaching liquid area of the absorption tower through water pipes.
Preferably, a filler layer is arranged below the distributor.
Preferably, a defogging plate is further arranged above the distributor.
Preferably, the circulating leaching mechanism further comprises a filter, and the filter is arranged between the water outlet of the absorption tower and the water pump.
Preferably, the third-stage absorption tower is provided with a water replenishing pipeline.
Preferably, the bottom of the first-stage absorption tower is further provided with a hydrochloric acid recovery pipeline.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses a hydrogen chloride tail gas absorbing device does not use liquid caustic soda or lime wash etc. to do the absorption liquid effectively guaranteeing the condition that tail gas discharge to reach standard, has reduced tail gas and has dealt with the cost, does not produce and contain salt waste water and does not cause secondary pollution, and the wider economic value of byproduct hydrochloric acid usage that can obtain higher concentration is higher.
Drawings
Fig. 1 is a schematic structural view of a hydrogen chloride tail gas absorption apparatus for by-producing high-concentration hydrochloric acid in example 1.
Fig. 2 is a schematic structural view of a hydrogen chloride off-gas absorption apparatus that produces by-product high-concentration hydrochloric acid in example 2.
Fig. 3 is a schematic structural view of a hydrogen chloride tail gas absorption apparatus for by-producing high-concentration hydrochloric acid in example 3.
In the drawings: 10-a first-stage absorption tower, 20-a second-stage absorption tower, 30-a third-stage absorption tower, 40-a gas path conveying line, 50-a water path conveying line, 60-a circulating leaching mechanism, 61-a distributor, 62-a water pump, 63-a filler layer, 64-a demisting plate, 65-a filter and 70-a water replenishing pipeline.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1: please refer to fig. 1, a preferred embodiment of the present invention provides a hydrogen chloride tail gas absorption apparatus for by-producing high concentration hydrochloric acid, which comprises an one-level absorption tower 10, a second-level absorption tower 20 and a third-level absorption tower 30, which are arranged in sequence, and is characterized in that a gas circuit conveying line 40 and a water circuit conveying line 50 are arranged between the one-level absorption tower 10, the second-level absorption tower 20 and the third-level absorption tower 30, and a circulation leaching mechanism 60 is arranged in each of the three groups of absorption towers. Further, the circulating leaching mechanism 60 comprises at least one group of distributors 61 and water pumps 62, wherein the distributors 61 are arranged at the middle upper part of the absorption tower, and the water pumps 62 are connected to a leaching liquid area at the lower part of the absorption tower through water pipes; a packing layer 63 is arranged below the distributor 61, and the packing layer 63 is used for increasing the contact area and the contact time of the leacheate and the tail gas and improving the absorption rate of the leacheate on the hydrogen chloride; a demisting plate 64 is further arranged above the distributor 61, and the demisting plate 64 is used for effectively separating the discharged tail gas from the leacheate.
In this embodiment, the circulating washing mechanism 60 further includes a filter 65, the filter 65 is disposed between the water outlet of the absorption tower and the water pump 62 to prevent the washing liquid from fixing the particle urban water pump 62, and the water pump 62 is a glass fiber reinforced plastic pump.
In this embodiment, the first-stage absorption tower 10, the second-stage absorption tower 20, and the third-stage absorption tower 30 have air inlets in the middle of the tower body, and have air outlets at the top thereof, the air path conveying line 40 is an air pipeline for conveying tail gas from the air outlet of the first-stage absorption tower 10 to the air outlet of the second-stage absorption tower 20 and from the air outlet of the second-stage absorption tower 20 to the air outlet of the third-stage absorption tower 30, and the air outlets on the third-stage absorption tower 30 are connected to the exhaust pipeline. Tail gas containing hydrogen chloride enters the primary absorption tower 10 from the gas inlet of the primary absorption tower 10, and is leached and absorbed under the action of the circulating leaching mechanism 60, so that most hydrogen chloride is absorbed; the tail gas enters the secondary absorption tower 20 from the gas outlet of the primary absorption tower 10 to the gas outlet of the secondary absorption tower 20, and is leached and absorbed again; and finally, the tail gas enters the third-stage absorption tower 30 from the gas outlet of the second-stage absorption tower 20 to the gas outlet of the third-stage absorption tower 30, and is leached and absorbed again, and the hydrogen chloride in the tail gas is washed to a washing solution by leaching for at least three times, so that the tail gas is convenient to recycle.
In this embodiment, the waterway transmission line 50 is a pipeline for transmitting the leacheate from the third absorption tower 30 to the second absorption tower 20 and from the second absorption tower 20 to the first absorption tower 10, the leacheate in the third absorption tower 30 is transmitted to the second absorption tower 20, the leacheate in the second absorption tower 20 is transmitted to the first absorption tower 10, the first absorption tower 10 repeatedly leaches the tail gas under the action of the circulating leaching mechanism 60, so that the hydrogen chloride in the tail gas can be effectively collected, the higher-concentration byproduct hydrochloric acid can be obtained from the leacheate in the first absorption tower 10, and meanwhile, the tail gas can reach the emission standard in the third leaching process.
In the embodiment, a hydrochloric acid recovery pipeline is further arranged at the bottom of the first-stage absorption tower 10, a pH meter is arranged in the first-stage absorption tower 10, or the leacheate in the first-stage absorption tower 10 is detected, and when the hydrochloric acid concentration of the leacheate is higher than 30%, the leacheate in the first-stage absorption tower 10 is recovered and used, so that the economic value is higher.
In the present embodiment, the three-stage absorption tower 30 is provided with a water replenishing pipeline 70, the water replenishing pipeline 70 is communicated with the circulating leaching mechanism 60, and clean water is sprayed out of the three-stage absorption tower 30 under the action of the water pump 62 so as to replenish the absorption liquid in time.
Example 2: referring to fig. 1, a preferred embodiment of the present invention provides a hydrogen chloride tail gas absorption apparatus with a high concentration hydrochloric acid byproduct, which is different from embodiment 1 only in that: two groups of circulating leaching mechanisms 60 which are sequentially arranged are arranged in the third-stage absorption tower 30, and the circulating leaching mechanism 60 positioned below circularly sprays leaching liquid in the third-stage absorption tower 30 into the third-stage absorption tower 30 under the action of a water pump 62 to leach the tail gas; the circulating leaching mechanism 60 positioned above is connected with the water replenishing pipeline 70 under the action of the water pump 62, and leaches the tail gas in the three-stage absorption tower 30 for two times, so that the tail gas reaches the emission standard when being discharged out of the three-stage absorption tower 30.
Example 3: referring to fig. 1, a preferred embodiment of the present invention provides a hydrogen chloride tail gas absorption apparatus with a high concentration hydrochloric acid byproduct, which is different from embodiment 2 only in that: two groups of circulating leaching mechanisms 60 which are sequentially arranged are arranged on the inner page of the first-stage absorption tower 10, and the two groups of circulating leaching mechanisms 60 are used for leaching the tail gas twice, so that the contact between the leaching water and the tail gas in the first-stage absorption tower 10 is increased, and the absorption rate of the leaching solution to the hydrogen chloride is improved.
The working principle is as follows:
when in use:
(1) an initial operation stage:
certain liquid level leacheate is supplemented in the first-stage absorption tower 10, the second-stage absorption tower 20 and the third-stage absorption tower 30, tail gas containing hydrogen chloride enters the first-stage absorption tower 10 through the gas inlet of the first-stage absorption tower 10, is leached and absorbed under the action of the circulating leaching mechanism 60, and is absorbed by the first-stage absorption tower 10, and then enters the second-stage absorption tower 20 from the gas outlet of the first-stage absorption tower 10 to the gas outlet of the second-stage absorption tower 20 for leaching and absorption again; and finally, the tail gas enters the third-stage absorption tower 30 from the gas outlet of the second-stage absorption tower 20 to the gas outlet of the third-stage absorption tower 30, is leached and absorbed again, and is led out from the top of the third-stage absorption tower 30 and discharged.
(2) A continuous operation stage:
the hydrogen chloride-containing tail gas trend is consistent with that of the initial operation stage.
And supplementing new water into the third-stage absorption tower 30, conveying the leacheate in the third-stage absorption tower 30 into the second-stage absorption tower 20 by using a glass fiber reinforced plastic pump, conveying the leacheate in the second-stage absorption tower 20 into the first-stage absorption tower 10, repeatedly leaching tail gas by using the three absorption towers under the action of the circulating leaching mechanism 60, and discharging hydrogen chloride in the absorption liquid of the first-stage absorption tower 10 after reaching a certain concentration to be sold or used as a byproduct hydrochloric acid.
(3) A deactivation phase:
stopping inputting the tail gas containing the hydrogen chloride, completely discharging the absorption liquid in the primary absorption tower 10, completely conveying the absorption liquid in the secondary absorption tower 20 to the primary absorption tower 10, completely conveying the absorption liquid in the tertiary absorption tower 30 to the secondary absorption tower 20, and supplementing enough new water to the tertiary absorption tower 30; waiting for the next tail gas treatment process.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The above description is for the detailed description of the preferred possible embodiments of the present invention, but the embodiments are not intended to limit the scope of the present invention, and all equivalent changes or modifications accomplished under the technical spirit suggested by the present invention should fall within the scope of the present invention.
Claims (9)
1. The utility model provides a hydrogen chloride tail gas absorbing device of by-product high concentration hydrochloric acid, includes one-level absorption tower (10), second grade absorption tower (20) and tertiary absorption tower (30), and the three arranges the setting in proper order, its characterized in that, be equipped with gas circuit transfer chain (40) and water route transfer chain (50) between one-level absorption tower (10), second grade absorption tower (20) and tertiary absorption tower (30), and all be equipped with circulation drip washing mechanism (60) in the three absorption towers.
2. The hydrogen chloride tail gas absorption device for by-producing high-concentration hydrochloric acid as claimed in claim 1, wherein the first absorption tower (10), the second absorption tower (20) and the third absorption tower (30) are provided with gas inlets at the middle parts thereof and gas outlets at the top parts thereof, the gas path conveying line (40) is a gas line for conveying tail gas from the gas outlet of the first absorption tower (10) to the gas outlet of the second absorption tower (20) and from the gas outlet of the second absorption tower (20) to the gas outlet of the third absorption tower (30), and the gas outlets on the third absorption tower (30) are connected with an exhaust pipeline.
3. The hydrogen chloride tail gas absorption device for by-producing high-concentration hydrochloric acid according to claim 1, wherein the water path conveying line (50) is a pipeline for conveying the leacheate from the third absorption tower (30) to the second absorption tower (20) and from the second absorption tower (20) to the first absorption tower (10).
4. The absorption apparatus for hydrogen chloride tail gas with byproduct of high concentration hydrochloric acid according to claim 1, wherein the circulating leaching mechanism (60) comprises at least one set of distributor (61) and water pump (62), the distributor (61) is disposed at the middle upper part of the absorption tower, and the water pump (62) is connected to the lower leaching solution area of the absorption tower through a water pipe.
5. The absorption apparatus for hydrogen chloride tail gas with byproduct of high concentration hydrochloric acid according to claim 4, wherein a packing layer (63) is arranged below the distributor (61).
6. The absorption apparatus for hydrogen chloride tail gas with byproduct of high concentration hydrochloric acid according to claim 4, wherein a demisting plate (64) is further disposed above the distributor (61).
7. The absorption apparatus for tail gas of hydrogen chloride with byproduct of high concentration hydrochloric acid according to claim 4, wherein the circulating washing mechanism (60) further comprises a filter (65), and the filter (65) is disposed between the water outlet of the absorption tower and the water pump (62).
8. The absorption apparatus for hydrogen chloride tail gas with byproduct of high concentration hydrochloric acid according to claim 1, wherein the tertiary absorption tower (30) is provided with a water replenishing pipeline (70).
9. The absorption apparatus for hydrogen chloride tail gas with byproduct of high concentration hydrochloric acid according to claim 1, wherein the bottom of the primary absorption tower (10) is further provided with a hydrochloric acid recovery pipeline.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922405517.XU CN211612176U (en) | 2019-12-27 | 2019-12-27 | Hydrogen chloride tail gas absorbing device of by-product high concentration hydrochloric acid |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922405517.XU CN211612176U (en) | 2019-12-27 | 2019-12-27 | Hydrogen chloride tail gas absorbing device of by-product high concentration hydrochloric acid |
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| CN211612176U true CN211612176U (en) | 2020-10-02 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113666535A (en) * | 2021-08-24 | 2021-11-19 | 山东昊邦化学有限公司 | Chlorobenzene alkaline waste water treatment method |
| CN114452805A (en) * | 2022-02-09 | 2022-05-10 | 山西凯宇化工股份有限公司 | Second-stage absorption system of hydrochloric acid tower for chemical synthetic materials |
-
2019
- 2019-12-27 CN CN201922405517.XU patent/CN211612176U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113666535A (en) * | 2021-08-24 | 2021-11-19 | 山东昊邦化学有限公司 | Chlorobenzene alkaline waste water treatment method |
| CN114452805A (en) * | 2022-02-09 | 2022-05-10 | 山西凯宇化工股份有限公司 | Second-stage absorption system of hydrochloric acid tower for chemical synthetic materials |
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