CN219836332U - Tail gas treatment system - Google Patents
Tail gas treatment system Download PDFInfo
- Publication number
- CN219836332U CN219836332U CN202321082493.9U CN202321082493U CN219836332U CN 219836332 U CN219836332 U CN 219836332U CN 202321082493 U CN202321082493 U CN 202321082493U CN 219836332 U CN219836332 U CN 219836332U
- Authority
- CN
- China
- Prior art keywords
- washing tower
- tower
- tail gas
- buffer tank
- washing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000005406 washing Methods 0.000 claims abstract description 77
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 58
- 239000007788 liquid Substances 0.000 claims abstract description 56
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000000872 buffer Substances 0.000 claims abstract description 33
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 29
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 29
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 22
- 238000002425 crystallisation Methods 0.000 claims abstract description 18
- 230000008025 crystallization Effects 0.000 claims abstract description 18
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims description 6
- 239000012452 mother liquor Substances 0.000 claims description 5
- 238000005201 scrubbing Methods 0.000 abstract description 20
- 230000008676 import Effects 0.000 abstract description 8
- 239000007789 gas Substances 0.000 description 36
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 description 6
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 description 6
- 235000019837 monoammonium phosphate Nutrition 0.000 description 6
- 239000006012 monoammonium phosphate Substances 0.000 description 6
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 4
- 230000006641 stabilisation Effects 0.000 description 4
- 238000011105 stabilization Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 3
- 229940053195 antiepileptics hydantoin derivative Drugs 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 description 2
- 150000001469 hydantoins Chemical class 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 2
- 235000017557 sodium bicarbonate Nutrition 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 235000011007 phosphoric acid Nutrition 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
Abstract
The utility model provides a tail gas treatment system, includes first scrubbing tower, second scrubbing tower, crystallization kettle, first buffer tank, the tail gas import at the bottom of the first scrubbing tower is used for linking to each other with the ammonia and contains carbon dioxide tail gas source, and the top of the tower gas vent of first scrubbing tower links to each other with the tail gas import at the bottom of the second scrubbing tower, and the bottom liquid outlet of first scrubbing tower links to each other with the washing liquid import of first scrubbing tower through first circulation pipeline, the bottom liquid outlet of second scrubbing tower links to each other with the washing liquid import of second scrubbing tower through second circulation pipeline, and the top of the tower gas vent of second scrubbing tower feeds to first buffer tank through the compressor, be provided with cooling coil in the first buffer tank. The utility model has simple structure and convenient operation, can effectively recycle ammonia and carbon dioxide in the tail gas containing ammonia and carbon dioxide, and improves the utilization rate of materials.
Description
Technical Field
The utility model relates to the field of chemical industry, in particular to a tail gas treatment system.
Background
Chemical enterprises use cyanohydrin to react with ammonia gas and carbon dioxide to synthesize hydantoin derivatives. The synthesis method requires excessive ammonia and carbon dioxide, so that the mixed tail gas containing ammonia, carbon dioxide and water vapor is inevitably treated, and the carbon dioxide emission amount is large.
At present, after the tail gas treatment system matched with enterprises finishes absorbing ammonia, the rest carbon dioxide is directly discharged, so that the carbon dioxide cannot be effectively utilized, and raw material waste is caused.
Therefore, how to efficiently treat the tail gas containing ammonia and carbon dioxide and improve the utilization rate of components in the tail gas is a problem to be solved by the technicians in the field.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides a tail gas treatment system which has simple structure and convenient operation, can effectively recycle ammonia and carbon dioxide in tail gas containing ammonia and carbon dioxide, and improves the utilization rate of materials.
The technical scheme for realizing the aim of the utility model is as follows: the utility model provides a tail gas treatment system, includes first scrubbing tower, second scrubbing tower, crystallization kettle, first buffer tank, the tail gas import at the bottom of the first scrubbing tower is used for linking to each other with the ammonia and contains carbon dioxide tail gas source, and the top of the tower gas vent of first scrubbing tower links to each other with the tail gas import at the bottom of the second scrubbing tower, and the bottom liquid outlet of first scrubbing tower links to each other with the washing liquid import of first scrubbing tower through first circulation pipeline, the bottom liquid outlet of second scrubbing tower links to each other with the washing liquid import of second scrubbing tower through second circulation pipeline, and the top of the tower gas vent of second scrubbing tower feeds to first buffer tank through the compressor, be provided with cooling coil in the first buffer tank.
And the top exhaust port of the second washing tower supplies materials to the compressor through a second buffer tank.
The first buffer tank is used for providing carbon dioxide raw materials to the outside through the third buffer tank.
The first washing tower and the second washing tower have the same structure, and the top of each washing tower is provided with a liquid distributor.
The second circulating pipeline is provided with a liquid discharge pipe, and the opening and the closing of the liquid discharge pipe are controlled through a valve.
The technical scheme has the following beneficial effects:
1. the tail gas treatment system comprises a first washing tower, a second washing tower, a crystallization kettle and a first buffer tank. The tail gas inlet at the bottom of the first washing tower is used for being connected with a tail gas source containing ammonia and carbon dioxide, the top exhaust port of the first washing tower is connected with the tail gas inlet at the bottom of the second washing tower, the bottom liquid outlet of the first washing tower is used for feeding the crystallization kettle, the first washing tower absorbs ammonia in the tail gas containing ammonia and carbon dioxide through washing liquid, the washing liquid is usually selected as mixed liquid of phosphoric acid and monoammonium phosphate, after absorbing the ammonia, the mixed liquid of phosphoric acid, monoammonium phosphate and monoammonium phosphate is obtained, the mixed liquid is discharged to the crystallization kettle, the monoammonium phosphate is separated out through cooling crystallization, and the crystals are sold as products after being separated, so that the utilization rate of ammonia in the tail gas can be effectively improved. The mother liquor outlet of the crystallization kettle is connected with the washing liquid inlet of the first washing tower through the first circulating pipeline, mother liquor separated by the crystallization kettle returns to the first washing tower and is reused as absorption liquid, the utilization rate of the washing liquid is effectively improved, and the use cost and the wastewater discharge capacity are reduced. The tower bottom liquid outlet of the second washing tower is connected with the washing liquid inlet of the second washing tower through a second circulating pipeline, the second washing tower is usually used for absorbing residual ammonia in tail gas by using sodium bicarbonate as washing liquid, the purity of carbon dioxide is guaranteed to reach a use standard, the second washing tower is connected with the washing liquid inlet of the second washing tower through the second circulating pipeline and is used as absorption liquid for reuse, the utilization rate of the washing liquid is effectively improved, and the use cost and the wastewater discharge capacity are reduced. The top of the second washing tower is provided with a cooling coil, the first buffer tank is internally provided with a cooling coil, the tail gas containing water vapor and carbon dioxide is primarily dehydrated after being compressed and then enters the first buffer tank to expand, the cooling coil is combined to further cool down, so that the residual water vapor is converted into a liquid phase and is trapped in the first buffer tank to obtain dry carbon dioxide gas which can be used as raw materials or other industrial gases, and thus the ammonia and the carbon dioxide in the tail gas are almost 100% utilized.
2. And an air outlet at the top of the second washing tower supplies materials to the compressor through a second buffer tank, so that the air flow discharged to the compressor is ensured to be stable, and the normal operation of the compressor is ensured.
3. The second circulating pipeline is provided with a liquid discharge pipe, and the opening and the closing are controlled through a valve, so that the rich liquid can be discharged through the liquid discharge pipe, the lean liquid can be supplemented and the rich liquid can be recycled after being analyzed.
Further description is provided below with reference to the drawings and detailed description.
Drawings
FIG. 1 is a schematic diagram of the connection of the present utility model.
In the drawing, 1 is a first washing tower, 2 is a second washing tower, 3 is a crystallization kettle, 4 is a first buffer tank, 5 is a first circulation pipeline, 6 is a second circulation pipeline, 7 is a compressor, 8 is a cooling coil, 9 is a second buffer tank, 10 is a third buffer tank, 11 is a liquid distributor, and 12 is a liquid discharge pipe.
Detailed Description
Referring to FIG. 1, an embodiment of an exhaust treatment system is shown. The tail gas treatment system comprises a first washing tower 1, a second washing tower 2, a crystallization kettle 3 and a first buffer tank 4. The tail gas inlet at the bottom of the first washing tower is used for being connected with an ammonia-containing carbon dioxide-containing tail gas source, the top exhaust port of the first washing tower is connected with the tail gas inlet at the bottom of the second washing tower, the bottom liquid outlet of the first washing tower supplies materials to the crystallization kettle 3, the mother liquor outlet of the crystallization kettle is connected with the washing liquid inlet of the first washing tower through a first circulating pipeline 5, and in the embodiment, the top of the first washing tower is provided with a liquid distributor 11 which is connected with the washing liquid inlet. The liquid outlet at the bottom of the second washing tower is connected with the washing liquid inlet of the second washing tower through a second circulation pipeline 6, specifically, the structure of the second washing tower is the same as that of the first washing tower, that is, a liquid distributor is also arranged at the top of the second washing tower and is connected with the washing liquid inlet, in this embodiment, a liquid discharge pipe 12 is arranged on the second circulation pipeline 6, and the opening and the closing are controlled through a valve. The top exhaust port of the second washing tower feeds the first buffer tank 4 through the compressor 7, a cooling coil 8 is arranged in the first buffer tank 4, in this embodiment, the top exhaust port of the second washing tower 2 feeds the compressor through the second buffer tank 9, and the first buffer tank 4 provides carbon dioxide raw material to the outside through the third buffer tank 10.
The working principle of the utility model is that the tail gas containing ammonia, carbon dioxide and water vapor generated in the process of synthesizing hydantoin derivatives by using cyanohydrin, ammonia gas and carbon dioxide in chemical enterprises enters a first washing tower, and mixed liquid of phosphoric acid and monoammonium phosphate is selected as washing liquid to absorb ammonia in the tail gas. After absorbing ammonia gas, mixed liquid rich solution of phosphoric acid, monoammonium phosphate and ammonium hydrogen phosphate is obtained and discharged to a crystallization kettle, the ammonium hydrogen phosphate is separated out through cooling crystallization, the crystals are separated and sold as products, and mother liquor separated by the crystallization kettle is returned to a first washing tower and is reused as absorption liquid. The tail gas of the separated ammonia gas enters a second washing tower, sodium bicarbonate is selected as washing liquid for absorbing residual ammonia in the tail gas, the purity of the carbon dioxide is guaranteed to reach a use standard, the obtained rich liquid after washing is connected with a washing liquid inlet of the second washing tower through a second circulating pipeline and is used as absorption liquid for reuse, the tail gas containing water vapor and carbon dioxide is subjected to pressure stabilization and flow stabilization through a second buffer tank, is subjected to compression and preliminary water removal, then enters a first buffer tank for expansion, is combined with a cooling coil pipe for further cooling, enables the residual water vapor to be converted into a liquid phase, is trapped in the first buffer tank, and is used as raw material or other industrial gases after being subjected to pressure stabilization and speed stabilization through a third buffer tank, so that dry carbon dioxide gas is obtained.
Claims (5)
1. An exhaust gas treatment system, characterized in that: comprises a first washing tower (1), a second washing tower (2), a crystallization kettle (3) and a first buffer tank (4),
the tail gas inlet at the bottom of the first washing tower is used for being connected with a tail gas source containing ammonia and carbon dioxide, the top gas outlet of the first washing tower is connected with the tail gas inlet at the bottom of the second washing tower, the bottom liquid outlet of the first washing tower supplies material to the crystallization kettle (3), the mother liquor outlet of the crystallization kettle is connected with the washing liquid inlet of the first washing tower through a first circulating pipeline (5),
the tower bottom liquid outlet of the second washing tower is connected with the washing liquid inlet of the second washing tower through a second circulating pipeline (6), the tower top air outlet of the second washing tower supplies materials to the first buffer tank (4) through a compressor (7), and a cooling coil (8) is arranged in the first buffer tank (4).
2. The exhaust gas treatment system of claim 1, wherein: the top exhaust port of the second washing tower (2) feeds the compressor through a second buffer tank (9).
3. The exhaust gas treatment system of claim 1, wherein: the first buffer tank (4) provides carbon dioxide raw materials to the outside through the third buffer tank (10).
4. The exhaust gas treatment system of claim 1, wherein: the first washing tower (1) and the second washing tower (2) have the same structure, and the top of each washing tower is provided with a liquid distributor (11).
5. The exhaust gas treatment system of claim 1, wherein: the second circulation pipeline (6) is provided with a liquid discharge pipe (12) and is controlled to be opened and closed by a valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321082493.9U CN219836332U (en) | 2023-05-08 | 2023-05-08 | Tail gas treatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321082493.9U CN219836332U (en) | 2023-05-08 | 2023-05-08 | Tail gas treatment system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219836332U true CN219836332U (en) | 2023-10-17 |
Family
ID=88302314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321082493.9U Active CN219836332U (en) | 2023-05-08 | 2023-05-08 | Tail gas treatment system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219836332U (en) |
-
2023
- 2023-05-08 CN CN202321082493.9U patent/CN219836332U/en active Active
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