CN115430280A - Oxynitride waste gas treatment method - Google Patents
Oxynitride waste gas treatment method Download PDFInfo
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- CN115430280A CN115430280A CN202211165024.3A CN202211165024A CN115430280A CN 115430280 A CN115430280 A CN 115430280A CN 202211165024 A CN202211165024 A CN 202211165024A CN 115430280 A CN115430280 A CN 115430280A
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- CN
- China
- Prior art keywords
- waste gas
- oxynitride
- solution
- ammonium thiocyanate
- introducing
- 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.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000002912 waste gas Substances 0.000 title claims abstract description 18
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 36
- SOIFLUNRINLCBN-UHFFFAOYSA-N ammonium thiocyanate Chemical compound [NH4+].[S-]C#N SOIFLUNRINLCBN-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000007789 gas Substances 0.000 claims abstract description 13
- 239000000243 solution Substances 0.000 claims abstract description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 10
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000004202 carbamide Substances 0.000 claims abstract description 8
- 239000011259 mixed solution Substances 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- ZMZDMBWJUHKJPS-UHFFFAOYSA-N hydrogen thiocyanate Natural products SC#N ZMZDMBWJUHKJPS-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 4
- ZMZDMBWJUHKJPS-UHFFFAOYSA-M Thiocyanate anion Chemical compound [S-]C#N ZMZDMBWJUHKJPS-UHFFFAOYSA-M 0.000 claims abstract description 4
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
- 238000001179 sorption measurement Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- CAMXVZOXBADHNJ-UHFFFAOYSA-N ammonium nitrite Chemical compound [NH4+].[O-]N=O CAMXVZOXBADHNJ-UHFFFAOYSA-N 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 150000003839 salts Chemical class 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
Abstract
The invention discloses a nitrogen oxide waste gas treatment method, belongs to the field of atmospheric pollution treatment, and solves the technical problems of high investment, low efficiency and the like of nitrogen oxide waste gas treatment methods in the prior art. The invention relates to a nitrogen oxide waste gas treatment method, which comprises the following steps: (1) introducing oxynitride waste gas into a mixed solution of ammonium thiocyanate and urea with a certain concentration, and reacting to generate nitrogen, water and thiocyanate; (2) introducing ammonia gas into the solution generated in the step (1) to react to generate ammonium thiocyanate; (3) and (3) introducing ammonium thiocyanate generated by the reaction in the step (2) into the solution in the step (1) for circulation, so as to reduce the concentration of the oxynitride in the exhaust gas. The method for treating the oxynitride waste gas is low in investment, high in efficiency and environment-friendly and efficient.
Description
Technical Field
The patent relates to the field of atmospheric pollution treatment, in particular to a nitrogen oxide waste gas treatment method.
Background
The current nitrogen oxide waste gas treatment methods can be divided into three methods, namely a catalytic reduction method and an absorption and adsorption method according to different purification principles. The catalytic reduction method mainly has the functions of reducing oxynitride in the waste gas into pollution-free nitrogen and water under the conditions of high temperature and catalyst, the temperature is higher during reaction, and a catalyst is needed, so the investment of waste gas treatment equipment is larger, and the cost is higher. The adsorption method is mainly to adsorb nitrogen oxides in exhaust gas by using an adsorbent material and an adsorbent, and is only suitable for treating exhaust gas with low nitrogen oxide concentration and small gas amount due to small adsorption capacity. The absorption method uses water or aqueous solution of acid, alkali and salt to absorb nitrogen oxide in the waste gas to purify the waste gas. The method has the advantages of low equipment investment and low cost.
Disclosure of Invention
The invention aims to provide a nitrogen oxide waste gas treatment method which is low in cost, environment-friendly and efficient.
In order to realize the purpose, the invention adopts the following technical scheme:
an oxynitride exhaust gas treatment method, comprising the steps of:
(1) introducing oxynitride waste gas into ammonium thiocyanate and urea solution with certain concentration, and reacting to generate nitrogen, water and thiocyanate;
(2) introducing ammonia gas into the solution generated in the step (1) to react to generate ammonium thiocyanate;
(3) and (3) introducing ammonium thiocyanate generated by the reaction in the step (2) into the solution in the step (1) for circulation, so as to reduce the concentration of the oxynitride in the exhaust gas.
Preferably, the concentration of the ammonium thiocyanate in the step (1) is 30-60%, and the content of the urea in the solution is 1-5%.
The method for treating the oxynitride waste gas is low in investment, high in efficiency and environment-friendly and efficient.
Drawings
FIG. 1 is a schematic flow chart of a method for treating an exhaust gas containing nitrogen oxides according to the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in FIG. 1, the method for treating NOx exhaust gas according to the present invention comprises introducing the NOx exhaust gas into a reactor at a concentration of 30% > EIn a mixed solution of 60 percent of ammonium thiocyanate and urea (the content of the urea in the mixed solution is 1 to 5 percent, and the PH value of the mixed solution is controlled between 3 and 6), SCN - The method comprises the steps of rapidly reacting under the promoting action of urea to generate ammonium nitrite and thiocyanate, unstably decomposing the ammonium nitrite into nitrogen and water, introducing a certain amount of ammonia gas into the reacted ammonium thiocyanate solution to generate the ammonium thiocyanate solution for continuous recycling, and finally discharging gas which is low-concentration oxynitride waste gas and is lower than the national emission standard.
Claims (2)
1. A method for treating an exhaust gas containing nitrogen oxides, comprising the steps of:
(1) introducing oxynitride waste gas into a mixed solution of ammonium thiocyanate and urea with a certain concentration, and reacting to generate nitrogen, water and thiocyanate;
(2) introducing ammonia gas into the solution generated in the step (1) to react to generate ammonium thiocyanate;
(3) and (3) introducing ammonium thiocyanate generated by the reaction in the step (2) into the solution in the step (1) for circulation, so as to reduce the concentration of the oxynitride in the exhaust gas.
2. The method for treating nitrogen oxide exhaust gas according to claim 1, wherein the concentration of ammonium thiocyanate in step (1) is 30-60%, the content of urea in the solution is 1-5%, and the pH of the mixed solution is controlled to be 3-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211165024.3A CN115430280A (en) | 2022-09-23 | 2022-09-23 | Oxynitride waste gas treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211165024.3A CN115430280A (en) | 2022-09-23 | 2022-09-23 | Oxynitride waste gas treatment method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115430280A true CN115430280A (en) | 2022-12-06 |
Family
ID=84248320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211165024.3A Withdrawn CN115430280A (en) | 2022-09-23 | 2022-09-23 | Oxynitride waste gas treatment method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115430280A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5229090A (en) * | 1991-07-03 | 1993-07-20 | Nalco Fuel Tech | Process for nitrogen oxides reduction to lowest achievable level |
| CA2125208A1 (en) * | 1994-06-06 | 1995-12-07 | Michael Nisbet | Method of reducing the content of nitrogen oxide in cement kiln exhaust gases |
| JP2008049258A (en) * | 2006-08-24 | 2008-03-06 | Mitsui Chemicals Inc | Nox reducing agent for treating internal combustion engine exhaust gas |
| CN104923045A (en) * | 2014-03-20 | 2015-09-23 | 成都市华能佳源应用技术研究所 | Oxynitride waste gas urea-absorption processing method |
-
2022
- 2022-09-23 CN CN202211165024.3A patent/CN115430280A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5229090A (en) * | 1991-07-03 | 1993-07-20 | Nalco Fuel Tech | Process for nitrogen oxides reduction to lowest achievable level |
| CA2125208A1 (en) * | 1994-06-06 | 1995-12-07 | Michael Nisbet | Method of reducing the content of nitrogen oxide in cement kiln exhaust gases |
| JP2008049258A (en) * | 2006-08-24 | 2008-03-06 | Mitsui Chemicals Inc | Nox reducing agent for treating internal combustion engine exhaust gas |
| CN104923045A (en) * | 2014-03-20 | 2015-09-23 | 成都市华能佳源应用技术研究所 | Oxynitride waste gas urea-absorption processing method |
Non-Patent Citations (1)
| Title |
|---|
| 冶金工业出版社《中国冶金百科全书》编辑部编: "《中国冶金百科全书 炼焦化工》", 冶金工业出版社, pages: 66 * |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20221206 |