CN211712642U - Device for preparing solid ammonium chloride from ammonia-containing waste gas - Google Patents
Device for preparing solid ammonium chloride from ammonia-containing waste gas Download PDFInfo
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- CN211712642U CN211712642U CN202020081853.3U CN202020081853U CN211712642U CN 211712642 U CN211712642 U CN 211712642U CN 202020081853 U CN202020081853 U CN 202020081853U CN 211712642 U CN211712642 U CN 211712642U
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Abstract
The utility model relates to a device of ammonia waste gas preparation solid-state ammonium chloride, include: one-level absorption tower, second grade absorption tower, acid tank and desiccator, the waste gas that contains ammonia that comes from the production line links to each other through tail gas pipe and one-level absorption tower middle part, and the inside top of one-level absorption tower is provided with the annular shower that is used for spraying the acidizing fluid, and the annular shower links to each other with the inside below of one-level absorption tower through setting up at the outside circulating pump of one-level absorption tower, one-level absorption tower its upper portion be provided with the first blast pipe that is used for discharging waste gas and link to each other through first blast pipe and second grade absorption tower middle part, second grade absorption tower upper portion is equipped with the second blast pipe, is equipped with the draught fan that is used for producing the negative pressure on the second blast pipe for discharge through the waste gas after the second grade purifies. The utility model discloses the ammonium chloride solidification after will retrieving, the emission of whole process pollutant reaches national emission standard, has higher environmental protection and economic benefits.
Description
Technical Field
The utility model relates to an ammonia recovery technology specifically is a device that contains ammonia waste gas preparation solid-state ammonium chloride.
Background
In order to reduce environmental pollution, the recycling of aluminum ash, which is slag and floating skin generated during aluminum production, has been a problem which has been receiving attention in recent years. The technical means of scientific recycling of the aluminum ash with fine particles is to prepare the deoxidizer for steelmaking, wherein the key technical problem comprises the removal of nitrogen elements in the aluminum ash, and the existence of the nitrogen elements in the aluminum ash can influence the nitrogen content in steel in the steelmaking process, thereby influencing the quality of the steel, and is an uncontrollable quality factor.
The nitrogen element in the aluminum ash is removed, and ammonia-containing waste gas is generated in the prior art means, so that a new pollution source is formed. The treatment method of the waste gas containing ammonia generally comprises the following steps: absorption and decomposition. The former mainly uses water or dilute acid solution (sulfuric acid or hydrochloric acid) to absorb ammonia-containing waste gas, so that the ammonia-containing waste gas is converted into ammonia water, ammonium sulfate or ammonium chloride. The latter decomposition method decomposes ammonia gas into nitrogen gas and hydrogen gas mainly by the action of a catalyst, but the method has high treatment cost and few manufacturers.
At present, when ammonia-containing waste gas is used for preparing ammonium chloride, the process is that hydrochloric acid is used for absorbing ammonia gas in a spray tower, a sealed acid pool is arranged outdoors for acid circulation of the tower pool, and the ammonia gas is discharged when the content of the ammonium chloride in the acid pool reaches a certain concentration.
Disclosure of Invention
The utility model aims at providing a device that contains ammonia waste gas preparation solid-state ammonium chloride, through designing new containing ammonia waste gas circulation absorbing device, make the acidizing fluid of containing ammonia waste gas in the absorption process volatilize and the ammonia volatilize whole and be in and seal controllable state to the ammonium chloride solidification after will retrieving, whole process does not have the emission of any pollutant, and the absorption efficiency of ammonia is high.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an apparatus for preparing solid ammonium chloride from ammonia-containing waste gas, comprising: the system comprises a primary absorption tower, a secondary absorption tower, an acid tank and a dryer, wherein ammonia-containing waste gas from a production line is connected with the middle part of the primary absorption tower through a tail gas pipe, an annular spray pipe used for spraying acid liquor is arranged above the inside of the primary absorption tower, the annular spray pipe is connected with the lower part of the inside of the primary absorption tower through a circulating pump arranged outside the primary absorption tower, a first exhaust pipe used for discharging the waste gas is arranged at the upper part of the primary absorption tower and connected with the middle part of the secondary absorption tower through a first exhaust pipe, a second exhaust pipe is arranged at the upper part of the secondary absorption tower, a draught fan used for generating negative pressure is arranged on the second exhaust pipe and used for discharging the waste gas after secondary purification, and a first spray nozzle is also arranged above the inside of;
a second spray head is arranged above the inner part of the secondary absorption tower, the second spray head is connected with an external water source through a water pump, the lower part of the secondary absorption tower is connected with a first spray head above the inner part of the primary absorption tower through a supplement pipe, and the supplement pipe is provided with a supplement water pump for conveying ammonia-containing liquid to the first spray head;
a volatilization gas pipe is arranged at the upper part of the acid tank and is connected with a first spray head above the inner part of the primary absorption tower through the volatilization gas pipe, the lower part of the acid tank is connected with the lower part of the primary absorption tower through a first pipeline, and a first pump used for conveying acid liquor to the primary absorption tower is arranged on the first pipeline;
the dryer is connected with the primary absorption tower through a second pipeline, and a second pump for conveying the ammonium chloride mother liquor to the dryer is arranged on the second pipeline.
The dryer is a cyclone spray dryer.
The secondary absorption tower is internally provided with a top cap, and the top cap is connected with the first exhaust pipe.
The utility model has the advantages that: the utility model discloses a design new ammonia exhaust gas circulation absorption system that contains, the acidizing fluid that makes in the absorption process who contains ammonia exhaust gas volatilizees and ammonia volatilizees wholly and is in the controllable state of sealing to the ammonium chloride solidification after will retrieving, whole process does not have the emission of any pollutant, and the absorption efficiency of ammonia is high, has higher environmental protection and economic benefits.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
In the figure, 1, a first-stage absorption tower, 2, a second-stage absorption tower, 3, an acid tank, 4, a dryer, 5, a tail gas pipe, 6, an annular spray pipe, 7, a circulating pump, 8, a first exhaust pipe, 9, a first spray head, 10, a second spray head, 11, a water pump, 12, a second exhaust pipe, 13, a supplementary pipe, 14, a supplementary water pump, 15, a volatile gas pipe, 16, a first pipeline, 17, a first pump, 18, a second pipeline, 19, a second pump, 20, a top cap, 21 and a draught fan.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, an apparatus for preparing solid ammonium chloride from ammonia-containing waste gas comprises: the device comprises a primary absorption tower 1, a secondary absorption tower 2, an acid tank 3 and a dryer 4, wherein ammonia-containing waste gas from a production line is connected with the middle part of the primary absorption tower 1 through a tail gas pipe 5, an annular spray pipe 6 for spraying acid liquor is arranged above the inside of the primary absorption tower 1, the annular spray pipe 6 is connected with the lower part of the inside of the primary absorption tower 1 through a circulating pump 7 arranged outside the primary absorption tower 1, a first exhaust pipe 8 for exhausting the waste gas is arranged above the primary absorption tower 1 and is connected with the middle part of the secondary absorption tower 2 through the first exhaust pipe 8, a second exhaust pipe 12 is arranged above the secondary absorption tower 2, a draught fan 21 for generating negative pressure is arranged on the second exhaust pipe 12 and is used for exhausting the waste gas after secondary purification, and a first spray nozzle 9 is also arranged above the inside of the primary absorption tower 1;
a second spray head 10 is arranged above the interior of the secondary absorption tower 2, the second spray head 10 is connected with an external water source through a water pump 11, a second exhaust pipe 12 is arranged at the upper part of the secondary absorption tower 2 and used for exhausting waste gas after secondary purification, the lower part of the secondary absorption tower 2 is connected with a first spray head 9 above the interior of the primary absorption tower 1 through a supplementing pipe 13, and the supplementing pipe 13 is provided with a supplementing water pump 14 for conveying ammonia-containing liquid to the first spray head 9;
a volatilization gas pipe 15 is arranged at the upper part of the acid tank 3 and is connected with a first spray head 9 above the inner part of the primary absorption tower 1 through the volatilization gas pipe 15, the lower part of the acid tank 3 is connected with the lower part of the primary absorption tower 1 through a first pipeline 16, and a first pump 17 used for conveying acid liquor to the primary absorption tower 1 is arranged on the first pipeline 16;
the dryer 4 is connected with the first-stage absorption tower 1 through a second pipeline 18, and a second pump 19 for conveying the ammonium chloride mother liquor to the dryer 4 is arranged on the second pipeline 18.
The dryer 4 is a cyclone dryer or a spray dryer.
The secondary absorption tower 2 is internally provided with a top cap 20, and the top cap 20 is connected with the first exhaust pipe 8.
The utility model discloses a use method:
firstly, injecting a certain amount of hydrochloric acid solution from an acid tank 3 into a primary absorption tower 1, wherein the liquid level of the hydrochloric acid solution is lower than an exhaust port of a tail gas pipe 5, and injecting a certain amount of purified water into a secondary absorption tower 2, wherein the liquid level of the purified water is higher than the exhaust port of a top cap 20; then the device is started to carry out purification circulation, at the moment, the tail gas pipe 5 discharges the ammonia-containing waste gas from the production line into the primary absorption tower 1, the circulating pump 7 conveys the hydrochloric acid solution below the inner part of the primary absorption tower 1 to the annular spraying pipe 6 to be sprayed out, the hydrochloric acid solution reacts with the ammonia-containing waste gas to generate ammonium chloride solution, and the ammonium chloride solution returns to the lower part of the inner part of the primary absorption tower 1 to continue circulation; part of unabsorbed ammonia-containing waste gas enters a secondary absorption tower 2 for secondary absorption and purification, and clean tail gas is discharged from a second exhaust pipe 12;
in the secondary absorption tower 2, the purified water absorbing ammonia gas is changed into ammonia-containing liquid, the ammonia-containing liquid can be sprayed out from the first nozzle 9 through the supplementing pipe 13, and reacts with hydrochloric acid to generate ammonium chloride, and the primary absorption tower 1 is cooled; when the liquid level in the secondary absorption tower 2 is too low, water can be supplemented in a spraying mode through the water pump 11;
the volatilized hydrochloric acid gas enters a first nozzle 9 in the primary absorption tower 1 from a volatilizing gas pipe 15 above the acid tank 3 to participate in the synthesis reaction of ammonium chloride, so that the pollution of acid gas is avoided;
when the ammonium chloride solution reaches a certain concentration, the second pump 18 is started to convey the ammonium chloride solution to the cyclone dryer 4, and solid ammonium chloride is prepared.
The next cycle is then performed.
The part of the utility model not detailed is prior art.
Claims (3)
1. An apparatus for preparing solid ammonium chloride from ammonia-containing waste gas, comprising: one-level absorption tower (1), second grade absorption tower (2), acid tank (3) and desiccator (4), the waste gas that contains ammonia that comes from the production line passes through tail gas pipe (5) and links to each other with one-level absorption tower (1) middle part, and one-level absorption tower (1) inside top is provided with annular shower (6) that are used for spraying acidizing fluid, and annular shower (6) link to each other with one-level absorption tower (1) inside below through setting up at outside circulating pump (7) of one-level absorption tower (1), characterized by: a first exhaust pipe (8) for discharging waste gas is arranged at the upper part of the primary absorption tower (1) and is connected with the middle part of the secondary absorption tower (2) through the first exhaust pipe (8), a second exhaust pipe (12) is arranged at the upper part of the secondary absorption tower (2), a draught fan (21) for generating negative pressure is arranged on the second exhaust pipe (12) and is used for discharging the waste gas after secondary purification, and a first spray head (9) is also arranged above the inner part of the primary absorption tower (1);
a second spray head (10) is arranged above the inner part of the secondary absorption tower (2), the second spray head (10) is connected with an external water source through a water pump (11), the lower part of the secondary absorption tower (2) is connected with a first spray head (9) above the inner part of the primary absorption tower (1) through a supplement pipe (13), and the supplement pipe (13) is provided with a supplement water pump (14) for conveying ammonia-containing liquid to the first spray head (9);
a volatilization gas pipe (15) is arranged at the upper part of the acid tank (3) and is connected with a first spray head (9) above the inner part of the primary absorption tower (1) through the volatilization gas pipe (15), the lower part of the acid tank (3) is connected with the lower part of the primary absorption tower (1) through a first pipeline (16), and a first pump (17) used for conveying acid liquor to the primary absorption tower (1) is arranged on the first pipeline (16);
the dryer (4) is connected with the primary absorption tower (1) through a second pipeline (18), and a second pump (19) used for conveying the ammonium chloride mother liquor to the dryer (4) is arranged on the second pipeline (18).
2. The apparatus for preparing solid ammonium chloride from ammonia-containing waste gas as claimed in claim 1, wherein: the dryer (4) is a cyclone spray dryer.
3. The apparatus for preparing solid ammonium chloride from ammonia-containing waste gas as claimed in claim 1, wherein: the secondary absorption tower (2) is internally provided with a top cap (20), and the top cap (20) is connected with the first exhaust pipe (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020081853.3U CN211712642U (en) | 2020-01-15 | 2020-01-15 | Device for preparing solid ammonium chloride from ammonia-containing waste gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020081853.3U CN211712642U (en) | 2020-01-15 | 2020-01-15 | Device for preparing solid ammonium chloride from ammonia-containing waste gas |
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| CN211712642U true CN211712642U (en) | 2020-10-20 |
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| CN202020081853.3U Active CN211712642U (en) | 2020-01-15 | 2020-01-15 | Device for preparing solid ammonium chloride from ammonia-containing waste gas |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110963508A (en) * | 2020-01-15 | 2020-04-07 | 河南申越检测技术有限公司 | Device and process for preparing solid ammonium chloride from ammonia-containing waste gas |
| CN113735135A (en) * | 2021-09-08 | 2021-12-03 | 先导薄膜材料有限公司 | Ammonium chloride recycling device and method |
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2020
- 2020-01-15 CN CN202020081853.3U patent/CN211712642U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110963508A (en) * | 2020-01-15 | 2020-04-07 | 河南申越检测技术有限公司 | Device and process for preparing solid ammonium chloride from ammonia-containing waste gas |
| CN110963508B (en) * | 2020-01-15 | 2024-05-14 | 河南申越检测技术有限公司 | Device and process for preparing solid ammonium chloride from ammonia-containing waste gas |
| CN113735135A (en) * | 2021-09-08 | 2021-12-03 | 先导薄膜材料有限公司 | Ammonium chloride recycling device and method |
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