CN214635372U - Device is administered in urea production ammonia unloading - Google Patents
Device is administered in urea production ammonia unloading Download PDFInfo
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- CN214635372U CN214635372U CN202120073578.5U CN202120073578U CN214635372U CN 214635372 U CN214635372 U CN 214635372U CN 202120073578 U CN202120073578 U CN 202120073578U CN 214635372 U CN214635372 U CN 214635372U
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- pipeline
- heat exchanger
- pump
- sulfuric acid
- solution
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The utility model discloses an ammonia gas emptying treatment device in urea production, a sulfuric acid solution tank is connected with a sulfuric acid pump through a pipeline, the sulfuric acid pump is connected with an emptying cylinder through a pipeline, the top of the emptying cylinder is connected with a cylindrical demister through a pipeline, the top of the cylindrical demister is connected with a fan through a pipeline, and the fan is connected with a chimney through a pipeline; the desalting water tank is connected with a desalting water pump through a pipeline, the desalting water pump is connected with a heat exchanger through a pipeline, and the heat exchanger is connected with the desalting water tank through a pipeline to form a loop; the heat exchanger is connected with the emptying cylinder through a pipeline; the bottom of the heat exchanger is converged with a pipeline at the bottom of the cylindrical demister through a pipeline and then is connected with a desalting water tank; the solution discharged from the pipeline at the bottom of the emptying cylinder is divided into two paths: one path of the washing liquid is returned to the emptying cylinder through a second stop valve along the pipeline for circular washing when the solution concentration is low; and one path is discharged to a compound fertilizer workshop through a solution pump through a pipeline when the concentration of the solution is high. The utility model discloses can get rid of the ammonia completely, can fall to the liquid measure to the minimum again.
Description
Technical Field
The utility model belongs to the technical field of the environmental protection, a carry out entrapment recovery unit to ammonia before being used for ammonia to discharge into the atmosphere behind high low pressure absorber in urea production.
Background
In the production process of domestic urea, the urea is mainly composed of the parts of compression synthesis of raw materials of ammonia and carbon dioxide, low-pressure decomposition and absorption, evaporation, granulation and the like. The low-pressure absorption tower positioned in the low-pressure decomposition and absorption section absorbs ammonia gas and carbon dioxide gas discharged from the high-pressure decomposition tower, and a small amount of unabsorbed ammonia gas and carbon dioxide gas are decompressed by an ammonia gas emptying cylinder and then emptied.
At present, the content of ammonia in tail gas before entering an emptying cylinder in urea production reaches 3-5 ten thousand mg/m3And the environmental protection requirement is less than 30mg/m3The ammonia gas unloading section of thick bamboo generally adopts the washing tower of packing to add water washing, and the limitation of packing self, if add water can not too much, add water too much and cause the flooding, caused the ammonia can not be absorbed completely in the tail gas, the ammonia that comes too late to react is taken the gas outlet and is discharged, reaches environmental protection requirement and polluted environment.
The ammonia gas in the traditional ammonia gas emptying cylinder is washed by desalted water and then discharged into the atmosphere, and the desalted water cannot completely absorb the ammonia gas with a large content, so that the ammonia content in the tail gas discharged into the atmosphere exceeds the standard, and the air pollution is caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a device is administered in urea production ammonia unloading can get rid of the ammonia completely, can fall to the minimum with the liquid measure again.
The technical scheme of the utility model is that the ammonia gas emptying treatment device for urea production is characterized by comprising a sulfuric acid solution tank, a sulfuric acid pump, a solution pump, a desalting water tank, a desalting water pump, a heat exchanger, an emptying cylinder, a cylindrical demister, a fan and a chimney;
the sulfuric acid solution tank is connected with the sulfuric acid pump through an eleventh pipeline, the sulfuric acid pump is connected with the emptying cylinder through a ninth pipeline, the top of the emptying cylinder is connected with the cylindrical demister through a third pipeline, the top of the cylindrical demister is connected with the fan through a fourth pipeline, and the fan is connected with the chimney through a pipeline;
the desalting water tank is connected with the desalting water pump through a pipeline, the desalting water pump is connected with the heat exchanger through a fifth pipeline, and the heat exchanger is connected with the desalting water tank through a sixth pipeline to form a loop;
the heat exchanger is connected with the emptying cylinder through a second pipeline; the bottom of the heat exchanger is converged with a tenth pipeline at the bottom of the cylindrical demister through a seventh pipeline and then is connected with the desalting water tank;
the eighth pipeline at the bottom of the emptying cylinder is divided into two pipelines: one path is connected with the emptying cylinder through a second stop valve, a twelfth pipeline and a ninth pipeline; the other path is sent to a compound fertilizer workshop through a thirteenth pipeline and a solution pump.
The utility model has the characteristics that:
1. a demister is added for demisting independently, so that a small amount of gas passing through an emptying cylinder is completely removed before entering a chimney, and the ammonia in the tail gas before being discharged into the atmosphere is ensured to be completely trapped. The ammonia content in the outlet gas is less than 10mg/m3Less than the national environmental requirement value of less than 30mg/m3。
2. The solution at the bottom of the emptying cylinder can be recycled, the circulating liquid is pumped to a compound fertilizer workshop by the solution pump after reaching the set concentration, the dilute solution which does not reach the concentration is recycled, and the use amount of the sulfuric acid solution is reduced.
3. A sulfuric acid solution tank, a sulfuric acid pump, a desalting water tank, a desalting water pump, a heat exchanger, a fan, a chimney and a matched pipeline are added.
The utility model provides a pair of device is administered in urea production ammonia unloading adds appropriate amount dilute sulfuric acid before the ammonia is emptied, makes dilute sulfuric acid and ammonia react completely and generates ammonium sulfate solution, and ammonia in the tail gas can be absorbed completely, will accord with the clean gas emission atmosphere of national environmental protection requirement, and the product ammonium sulfate that the reaction generated is sent reciprocal fertile workshop of combining after being collected, as the raw materials of production compound fertilizer.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
The reference numbers illustrate: 1-13 are first to thirteenth pipes; 14-a fan; 15-a chimney; 16-a filler; 17-a first stop valve; 18-sulfuric acid solution tank; 19-sulfuric acid pump; 20-a second stop valve; 21-a third stop valve; 22-solution pump; 23-a fourth stop valve; 24-a desalination water tank; 25-a desalted water pump; 26-a fifth stop valve; 27-a heat exchanger; 28-emptying the cylinder; 29-cylinder demister.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the scope protected by the present invention.
As shown in fig. 1, the desalted water is led to a desalted water tank 24 through a fourth stop valve 23; the dilute sulfuric acid is led to the sulfuric acid solution tank 18 through a first shut-off valve 17.
The tail gas containing ammonia from the absorption tower enters a heat exchanger 27 from a first pipeline 1 at the upper part of the heat exchanger to exchange heat with desalted water from a fifth pipeline 5, and a fifth stop valve 26 is arranged on the fifth pipeline 5 to control the concentration of the desalted water. The tail gas with lower temperature after heat exchange is discharged from the second pipeline 2, the desalted water after heat absorption is discharged from the sixth pipeline 6 and enters the desalting water tank 24, and a small part of condensed water in the tail gas passing through the heat exchanger 27 enters the bottom of the heat exchanger 27 and flows back to the desalting water tank 24 through the seventh pipeline 7 for recycling.
The tail gas from the heat exchanger 27 enters the emptying cylinder 28 from the second pipeline 2 and reversely contacts with the dilute sulfuric acid solution from the ninth pipeline 9, the dilute solution is pumped to the ninth pipeline 9 from the sulfuric acid solution tank 18 by the sulfuric acid pump 19 and then enters the emptying cylinder 28, the gas-liquid exchange is completed on the surface of the packing 16 in the emptying cylinder 28, the dilute sulfuric acid solution reacts with ammonia gas in the tail gas to generate ammonium sulfate, the ammonium sulfate solution is settled to the bottom of the emptying cylinder 28 through gravity and is discharged through the eighth pipeline 8 after reaching a certain height, and the solution discharged from the eighth pipeline 8 is divided into two paths: and one path of the solution is returned to the ninth pipeline 9 for circular washing through the second stop valve 20 along the twelfth pipeline 12 when the concentration of the solution is low, the other path of the solution is discharged to a compound fertilizer workshop through the thirteenth pipeline 13 by the solution pump 22 when the concentration of the solution is high, a sampling port is arranged at the thirteenth pipeline 13, and the solution is discharged after reaching the set concentration through sampling analysis.
The tail gas which is discharged from the emptying cylinder 28 and contains a little acid mist liquid drops after being washed enters the lower part of the cylinder demister 29 through the third pipeline 3, the residual ammonia gas and acid mist are further collected through the cylinder demister 29, and the tail gas without ammonia gas is pumped from the upper part of the cylinder demister 29 to the chimney 15 through the fourth pipeline 4 and is discharged into the atmosphere. The mist droplets intercepted by the cylindrical mist eliminator 29 are settled down to the lower part of the cylindrical mist eliminator 29 by gravity and discharged to the desalination water tank 24 through the tenth pipe 10.
Claims (1)
1. A device for emptying and treating ammonia gas in urea production is characterized by comprising a sulfuric acid solution tank (18), a sulfuric acid pump (19), a solution pump (22), a desalting water tank (24), a desalting water pump (25), a heat exchanger (27), an emptying cylinder (28), a cylindrical demister (29), a fan (14) and a chimney (15);
the sulfuric acid solution tank (18) is connected with the sulfuric acid pump (19) through an eleventh pipeline (11), the sulfuric acid pump (19) is connected with the emptying cylinder (28) through a ninth pipeline (9), the top of the emptying cylinder (28) is connected with the cylindrical demister (29) through a third pipeline (3), the top of the cylindrical demister (29) is connected with the fan (14) through a fourth pipeline (4), and the fan (14) is connected with the chimney (15) through a pipeline;
the desalting water tank (24) is connected with the desalting water pump (25) through a pipeline, the desalting water pump (25) is connected with the heat exchanger (27) through a fifth pipeline (5), and the heat exchanger (27) is connected with the desalting water tank (24) through a sixth pipeline (6) to form a loop;
the heat exchanger (27) is connected with the emptying cylinder (28) through a second pipeline (2); the bottom of the heat exchanger (27) is converged with a tenth pipeline (10) at the bottom of the cylindrical demister (29) through a seventh pipeline (7) and then is connected with the desalination water tank (24);
the eighth pipeline (8) at the bottom of the emptying cylinder (28) is divided into two paths: one path of the pipeline is connected with the emptying cylinder (28) through a second stop valve (20), a twelfth pipeline (12) and a ninth pipeline (9); the other path is sent to a compound fertilizer workshop through a thirteenth pipeline (13) and a solution pump (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120073578.5U CN214635372U (en) | 2021-01-12 | 2021-01-12 | Device is administered in urea production ammonia unloading |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120073578.5U CN214635372U (en) | 2021-01-12 | 2021-01-12 | Device is administered in urea production ammonia unloading |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214635372U true CN214635372U (en) | 2021-11-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120073578.5U Active CN214635372U (en) | 2021-01-12 | 2021-01-12 | Device is administered in urea production ammonia unloading |
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| Country | Link |
|---|---|
| CN (1) | CN214635372U (en) |
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2021
- 2021-01-12 CN CN202120073578.5U patent/CN214635372U/en active Active
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