CN112354328A - Tail gas absorption process and device in melamine production process - Google Patents
Tail gas absorption process and device in melamine production process Download PDFInfo
- Publication number
- CN112354328A CN112354328A CN202011178733.6A CN202011178733A CN112354328A CN 112354328 A CN112354328 A CN 112354328A CN 202011178733 A CN202011178733 A CN 202011178733A CN 112354328 A CN112354328 A CN 112354328A
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- Prior art keywords
- tail gas
- gas
- absorption
- melamine
- acid
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 92
- 229920000877 Melamine resin Polymers 0.000 title claims abstract description 44
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000002253 acid Substances 0.000 claims abstract description 56
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000007788 liquid Substances 0.000 claims abstract description 27
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000004202 carbamide Substances 0.000 claims abstract description 15
- 239000003595 mist Substances 0.000 claims abstract description 8
- 239000000945 filler Substances 0.000 claims abstract description 7
- 238000000926 separation method Methods 0.000 claims abstract description 4
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 claims description 10
- 238000004806 packaging method and process Methods 0.000 claims description 7
- 238000012856 packing Methods 0.000 claims description 7
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 6
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 238000011084 recovery Methods 0.000 claims description 5
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 3
- 229910017604 nitric acid Inorganic materials 0.000 claims description 3
- 238000005829 trimerization reaction Methods 0.000 claims description 2
- 229910021529 ammonia Inorganic materials 0.000 description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 239000003337 fertilizer Substances 0.000 description 4
- 150000002828 nitro derivatives Chemical class 0.000 description 4
- 239000002994 raw material Substances 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 1
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 235000012538 ammonium bicarbonate Nutrition 0.000 description 1
- 239000001099 ammonium carbonate Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 238000012858 packaging process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1418—Recovery of products
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1487—Removing organic compounds
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/18—Nitrates of ammonium
- C01C1/185—Preparation
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C1/00—Ammonium nitrate fertilisers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/406—Ammonia
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Gas Separation By Absorption (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to the technical field of tail gas treatment, in particular to a tail gas absorption process and a tail gas absorption device in a melamine production process. The tail gas absorption process in the melamine production process comprises the following steps: after the tail gas in the melamine production process is boosted by a Roots blower, the tail gas enters a water absorption tower, ammonia gas, urea and melamine in the tail gas are absorbed by water, and then the tail gas enters a cyclone separator for separation; and the separated tail gas enters a filler section of the acid absorption tower, ammonia gas in the tail gas is further absorbed by acid absorption liquid, and then enters a bubble cover section to absorb acid mist by desalted water, and finally the tail gas is separated by the high-efficiency demister and is discharged up to the standard. The tail gas absorption process and the tail gas absorption device in the melamine production process can effectively absorb ammonia gas contained in the tail gas, and the treated tail gas does not contain acid mist, so that the energy is saved, the environment is protected, and the consumption is reduced.
Description
Technical Field
The invention relates to the technical field of tail gas treatment, in particular to a tail gas absorption process and a tail gas absorption device in a melamine production process.
Background
In the production process of melamine, solid urea is used as a raw material, the urea is decomposed in the urea melting process to form mixed gas of ammonia and carbon dioxide, and if the mixed gas is diffused into air, air pollution is caused. In addition, a large amount of off-gas is also generated in the melamine packaging process. The two parts of tail gas contain a large amount of ammonia gas, the concentration of the ammonia gas is about 4%, and the tail gas also contains trace melamine and urea.
The traditional tail gas treatment process uses water to absorb ammonia gas, the partial pressure of the ammonia gas is too low, the absorption efficiency is very low, the tail gas emission requirement cannot be met, the ammonia water recovered by the method is low in concentration and contains carbon dioxide, ammonium bicarbonate crystals can exist in the ammonia water, and the ammonia gas cannot be absorbed thoroughly. The ammonia water has low value, and the storage tank is needed for storage, so that certain waste exists. The melamine packaging tail gas also contains a large amount of ammonia, and if the ammonia is not recycled, the problem of environmental protection can be caused, and the waste of ammonia gas is caused. Therefore, a production process for completely absorbing the effective components of the tail gas is urgently needed.
Disclosure of Invention
The invention aims to provide a tail gas absorption process in the melamine production process, which not only effectively absorbs ammonia gas contained in the tail gas, but also does not contain acid mist in the treated tail gas, thereby saving energy, protecting environment and reducing consumption, and the absorbed ammonium nitrate solution can be used as a raw material for producing a nitro-compound fertilizer, so that the economic benefit is high; the invention also provides an absorption device, which has simple structure and convenient operation and realizes the complete absorption and utilization of ammonia gas in tail gas.
The tail gas absorption process in the melamine production process comprises the following steps:
(1) water absorption: after the tail gas in the melamine production process is boosted by a Roots blower, the tail gas enters a water absorption tower, ammonia gas, urea and melamine in the tail gas are absorbed by water, and then the tail gas enters a cyclone separator for separation;
(2) acid absorption: and the separated tail gas enters a filler section of the acid absorption tower, ammonia gas in the tail gas is further absorbed by acid absorption liquid, and then enters a bubble cover section to absorb acid mist by desalted water, and finally the tail gas is separated by the high-efficiency demister and is discharged up to the standard.
The tail gas in the production process of melamine comprises trimerization packaging tail gas and urea melting tail gas, the absolute pressure of the tail gas is 101.3KPa, and the ammonia content is 2-4 wt%.
In the water absorption tower, the concentration of ammonia water is controlled to be 6-8 wt%.
The pH value of the acid absorption liquid is 2-5.
The acid absorption liquid is nitric acid with the concentration of 5-6 wt%.
The flow rate of the desalted water is 0.5-2 t/h.
The device used in the tail gas absorption process in the melamine production process comprises a Roots blower, a water absorption tower, a cyclone separator and an acid absorption tower which are connected in sequence; the acid absorption tower is sequentially provided with a filler section, a bubble cap section and a demister from bottom to top; the lower end gas inlet of the packing section of the acid absorption tower is connected with a gas outlet of the cyclone separator, and the upper end liquid inlet is connected with an acid absorption liquid pipeline; the top of the acid absorption tower is connected with a tail gas discharge pipeline.
The Roots blower is connected with the melamine packaging tail gas pipeline and the urea melting tail gas pipeline.
A liquid outlet at the lower end of the packing section of the acid absorption tower is connected with a liquid inlet at the upper end of the packing section through a circulating pipeline.
The circulating pipeline is also connected with an ammonium nitrate recovery pipeline.
A dilute acid pump is arranged on the acid absorption liquid pipeline; the circulating pipeline is provided with a circulating pump and a cooler.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the tail gas absorption process in the melamine production process, water absorption and acid absorption are combined, so that ammonia gas contained in the tail gas is effectively absorbed, the treated tail gas does not contain acid mist, energy is saved, environmental protection and consumption reduction are realized, and the absorbed ammonium nitrate solution can be used as a raw material for producing the nitro-compound fertilizer, so that the economic benefit is high;
(2) the tail gas absorption device in the melamine production process has a simple structure, is convenient to operate, and realizes the complete absorption and utilization of ammonia gas in the tail gas by combining the water absorption tower and the acid absorption tower;
(3) the tail gas absorption process and the device in the melamine production process are combined, ammonia gas with the content of 2-4% in the tail gas can be completely recycled and used for producing ammonium nitrate and nitro compound fertilizer, the ammonia content in the absorbed tail gas is 0, and the absorption efficiency is 100%.
Drawings
FIG. 1 is a schematic view of the structure of an off-gas absorption unit in the melamine production process according to the invention;
in the figure: 1. a melamine packaging tail gas pipeline; 2. a urea melting tail gas pipeline; 3. a Roots blower; 4. a water absorption tower; 5. a cyclone separator; 6. a tail gas discharge pipeline; 7. an acid absorption tower; 8. a demister; 9. a blister section; 10. a filler section; 11. a circulation line; 12. an ammonium nitrate recovery pipeline; 13. a dilute acid pump; 14. a cooler; 15. a circulation pump; 16. an acid absorption liquid pipeline.
Detailed Description
Example 1
As shown in fig. 1, the apparatus for absorbing tail gas in melamine production according to the present invention comprises a roots blower 3, a water absorption tower 4, a cyclone separator 5 and an acid absorption tower 7, which are connected in sequence; the acid absorption tower 7 is sequentially provided with a filler section 10, a bubble cap section 9 and a demister 8 from bottom to top; the lower end gas inlet of the packing section 10 of the acid absorption tower 7 is connected with the gas outlet of the cyclone separator 5, and the upper end liquid inlet is connected with an acid absorption liquid pipeline 16; the top of the acid absorption tower 7 is connected with a tail gas discharge pipeline 6.
The Roots blower 3 is connected with the melamine packaging tail gas pipeline 1 and the urea melting tail gas pipeline 2.
A liquid outlet at the lower end of the packing section 10 of the acid absorption tower 7 is connected with a liquid inlet at the upper end of the packing section 10 through a circulating pipeline 11.
The recycle line 11 is also connected to an ammonium nitrate recovery line 12.
A dilute acid pump 13 is arranged on the acid absorption liquid pipeline 16; the circulation line 11 is provided with a circulation pump 15 and a cooler 14.
Example 2
The tail gas absorption device in the embodiment 1 is adopted to absorb the tail gas in the melamine production process of the company, the absolute pressure of the tail gas is 101.3KPa, the ammonia content is 2-4%, and the tail gas contains trace melamine and urea, and the steps are as follows:
(1) water absorption: after the tail gas is boosted by a Roots blower, the tail gas enters a water absorption tower, ammonia gas, urea and melamine in the tail gas are absorbed by water, the concentration of ammonia water in the water absorption tower is controlled to be 6-8 wt%, and then the tail gas enters a cyclone separator for separation;
(2) acid absorption: the separated tail gas enters a filler section of an acid absorption tower, ammonia in the tail gas is further absorbed by 5 wt% of nitric acid, acid absorption liquid is recycled through a circulating pump, the pH value of the acid absorption liquid is controlled to be 2-5, when the pH value of the acid absorption liquid is larger than 5, the acid absorption liquid is discharged and collected through an ammonium nitrate recovery pipeline, desalted water enters a bubble cap section after acid absorption to absorb acid mist, the flow of the desalted water is controlled to be 1t/h, and finally the desalted water is separated by a high-efficiency demister and is discharged up to the standard.
The final exhaust tail gas is detected, the ammonia gas content is 0, and 100% of ammonia gas is recycled; and the tail gas discharged does not contain acid mist, and has no pollution to the environment.
The device and the process are used for treating tail gas in 2 sets of 3 ten thousand ton melamine production processes of the company, 2000 tons of ammonia gas are recycled annually, and the byproduct ammonium nitrate solution is used for producing ammonium nitrate and nitro compound fertilizer, so that the economic benefit is high.
Claims (10)
1. A tail gas absorption process in a melamine production process is characterized in that: the method comprises the following steps:
(1) water absorption: after the tail gas in the melamine production process is boosted by a Roots blower, the tail gas enters a water absorption tower, ammonia gas, urea and melamine in the tail gas are absorbed by water, and then the tail gas enters a cyclone separator for separation;
(2) acid absorption: and the separated tail gas enters a filler section of the acid absorption tower, ammonia gas in the tail gas is further absorbed by acid absorption liquid, and then enters a bubble cover section to absorb acid mist by desalted water, and finally the tail gas is separated by the high-efficiency demister and is discharged up to the standard.
2. Process for the absorption of off-gas in the production of melamine according to claim 1, characterized in that: the tail gas in the production process of melamine comprises trimerization packaging tail gas and urea melting tail gas, and the content of ammonia gas is 2-4 wt%.
3. Process for the absorption of off-gas in the production of melamine according to claim 1, characterized in that: in the water absorption tower, the concentration of ammonia water is controlled to be 6-8 wt%.
4. Process for the absorption of off-gas in the production of melamine according to claim 1, characterized in that: the pH value of the acid absorption liquid is 2-5.
5. Process for the absorption of off-gas in the production of melamine according to claim 1, characterized in that: the acid absorption liquid is nitric acid with the concentration of 5-6 wt%.
6. Process for the absorption of off-gas in the production of melamine according to claim 1, characterized in that: the flow rate of the desalted water is 0.5-2 t/h.
7. An apparatus for the off-gas absorption process in the melamine production process according to any one of claims 1 to 6, characterized in that: comprises a Roots blower (3), a water absorption tower (4), a cyclone separator (5) and an acid absorption tower (7) which are connected in sequence; the acid absorption tower (7) is sequentially provided with a filling section (10), a bubble cap section (9) and a demister (8) from bottom to top; the lower end gas inlet of the packing section (10) of the acid absorption tower (7) is connected with the gas outlet of the cyclone separator (5), and the upper end liquid inlet is connected with an acid absorption liquid pipeline (16); the top of the acid absorption tower (7) is connected with a tail gas discharge pipeline (6).
8. Device for the absorption of off-gas in melamine production according to claim 7, characterized in that: a liquid outlet at the lower end of a filling section (10) of the acid absorption tower (7) is connected with a liquid inlet at the upper end of the filling section (10) through a circulating pipeline (11); the circulating pipeline (11) is also connected with an ammonium nitrate recovery pipeline (12).
9. Device for the absorption of off-gas in melamine production according to claim 7, characterized in that: a dilute acid pump (13) is arranged on the acid absorption liquid pipeline (16); the circulating pipeline (11) is provided with a circulating pump (15) and a cooler (14).
10. Device for the absorption of off-gas in melamine production according to claim 7, characterized in that: the Roots blower (3) is connected with the melamine packaging tail gas pipeline (1) and the urea melting tail gas pipeline (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011178733.6A CN112354328A (en) | 2020-10-29 | 2020-10-29 | Tail gas absorption process and device in melamine production process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011178733.6A CN112354328A (en) | 2020-10-29 | 2020-10-29 | Tail gas absorption process and device in melamine production process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112354328A true CN112354328A (en) | 2021-02-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011178733.6A Pending CN112354328A (en) | 2020-10-29 | 2020-10-29 | Tail gas absorption process and device in melamine production process |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120324789A1 (en) * | 2008-10-17 | 2012-12-27 | Alchem Environmental Ip Llc | Hydroponics Applications and Ancillary Modifications to a Polyphasic Pressurized Homogenizer |
| CN103785263A (en) * | 2014-02-14 | 2014-05-14 | 赣州华茂钨材料有限公司 | Ammonia-containing tail gas treatment recycling method |
| CN108144385A (en) * | 2018-01-18 | 2018-06-12 | 邯郸钢铁集团有限责任公司 | A kind of circulating water membranous type acid mist purifying tower |
| CN210057821U (en) * | 2019-03-15 | 2020-02-14 | 华强化工集团股份有限公司 | Treatment system for melamine packaging tail gas |
-
2020
- 2020-10-29 CN CN202011178733.6A patent/CN112354328A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120324789A1 (en) * | 2008-10-17 | 2012-12-27 | Alchem Environmental Ip Llc | Hydroponics Applications and Ancillary Modifications to a Polyphasic Pressurized Homogenizer |
| CN103785263A (en) * | 2014-02-14 | 2014-05-14 | 赣州华茂钨材料有限公司 | Ammonia-containing tail gas treatment recycling method |
| CN108144385A (en) * | 2018-01-18 | 2018-06-12 | 邯郸钢铁集团有限责任公司 | A kind of circulating water membranous type acid mist purifying tower |
| CN210057821U (en) * | 2019-03-15 | 2020-02-14 | 华强化工集团股份有限公司 | Treatment system for melamine packaging tail gas |
Non-Patent Citations (1)
| Title |
|---|
| 刘靖, 中国矿业大学出版社 * |
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Application publication date: 20210212 |