CN103521048A - Tail gas treatment method - Google Patents
Tail gas treatment method Download PDFInfo
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- CN103521048A CN103521048A CN201310485441.0A CN201310485441A CN103521048A CN 103521048 A CN103521048 A CN 103521048A CN 201310485441 A CN201310485441 A CN 201310485441A CN 103521048 A CN103521048 A CN 103521048A
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- CN
- China
- Prior art keywords
- tail gas
- treating method
- exhaust gas
- gas
- sent
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000007789 gas Substances 0.000 claims abstract description 98
- 238000006243 chemical reaction Methods 0.000 claims abstract description 18
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000001301 oxygen Substances 0.000 claims abstract description 12
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 12
- 238000002485 combustion reaction Methods 0.000 claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 7
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 7
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 20
- 239000000428 dust Substances 0.000 claims description 19
- 238000000889 atomisation Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 8
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- 238000006479 redox reaction Methods 0.000 claims description 6
- PQUCIEFHOVEZAU-UHFFFAOYSA-N Diammonium sulfite Chemical compound [NH4+].[NH4+].[O-]S([O-])=O PQUCIEFHOVEZAU-UHFFFAOYSA-N 0.000 claims description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 5
- 239000001257 hydrogen Substances 0.000 claims description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims description 5
- 239000012263 liquid product Substances 0.000 claims description 5
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 3
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims description 2
- 238000002309 gasification Methods 0.000 claims description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 14
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 abstract description 8
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 7
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 abstract description 4
- 238000006477 desulfuration reaction Methods 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 abstract 2
- 235000019738 Limestone Nutrition 0.000 abstract 1
- 230000023556 desulfurization Effects 0.000 abstract 1
- 239000006028 limestone Substances 0.000 abstract 1
- 239000007788 liquid Substances 0.000 abstract 1
- 239000000843 powder Substances 0.000 abstract 1
- 238000006722 reduction reaction Methods 0.000 abstract 1
- 230000007613 environmental effect Effects 0.000 description 6
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000003317 industrial substance Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
Abstract
The invention discloses a tail gas treatment method. Nitric oxide and sulfide in tail gas are sufficiently treated, ammonia water is used as a circulation liquid, and through mixing and reacting the ammonia water with the tail gas for multiple times, the sulfide content in the tail gas is greatly reduced; and furthermore due to adoption of a desulfurizing agent, high desulfurization efficiency is achieved, intermedium limestone powder generated in chemical reaction is reasonably utilized, and circulation environment recycling and harmlessness are realized; the nitric oxide in the tail gas is reduced into nitrogen after reduction reaction, and then is absorbed by a net nitrogen tower, so that the resource utilization rate is improved; as a low oxygen combustion technique is adopted, no sulfur dioxide is generated in the combustion process; and the tail gas treatment method is simple in process and low in cost.
Description
Technical field
The present invention relates to exhaust gas treating method, particularly a kind of mixed tail gas processing method.
Background technology
The growth of current industrial chemical field, the exhaust gas treating method of industrial process is more and more received to people's concern, general industry tail gas all contains a large amount of nitrogen oxide and sulfide, most enterprises conventionally only process and reclaim a kind of exhaust gas component wherein, and after causing the exhaust emissions after processing, still comprise toxic and harmful, people's health of the masses is constituted a threat to.
Therefore, need a kind of new technical scheme to address the above problem.
Summary of the invention
The problem and shortage existing for above-mentioned prior art, the object of this invention is to provide a kind of exhaust gas treating method, and integrated treatment mixed type tail gas is simple to operate.
For achieving the above object, the technical solution used in the present invention is a kind of exhaust gas treating method, comprises the following steps:
A) tail gas is carried out to atomization, and send in dissolving tank and carry out dust removal process, form low dust tail gas;
B) by step, the tail gas in a) carries out heat treated, forms high-temperature tail gas;
C) high-temperature tail gas fully contacts with ammoniacal liquor through blower fan, generates ammonium sulfite;
D), after the tail gas after step c) being sent into boiler furnace and fully being mixed with desulfurizing agent agstone, reaction generates calcium sulfate;
E) tail gas of step d) is fully contacted with water, filter the calcium sulfate producing, form liquid product;
F) by the tail gas gasification of step e), and mix in reactor with the reducing gas through preheating, redox reaction occurs;
G) tail gas being reduced in step f) being sent into ammonia-cleaning tower absorbs with desalted water;
H) tail gas in step g) is sent into and in boiler, carried out low oxygen combustion.
Preferably, the ammoniacal liquor in step c) is as circulation fluid, and basicity is 20 ~ 25tt.
Preferably, circulation fluid pressurizes through pump, after atomization, with tail gas after step c) hybrid reaction again.
Preferably, reducing gas is a kind of or both mists in hydrogen or carbon monoxide.
Preferably, step f) reaction temperature is 550 ~ 750 ℃.
Preferably, step h) in boiler, oxygen content is controlled at 5.5 ~ 6.5%.
The present invention compared to existing technology, its advantage is that the present invention fully processes the nitrogen oxide in tail gas and sulfide, ammoniacal liquor is as circulation fluid, by carrying out repeatedly hybrid reaction with tail gas, greatly reduce the sulfide content in tail gas, recycling desulfurizing agent, realize desulfuration efficiency high, rationally utilize the intermediate agstone producing in chemical reaction, realized circulation environment resource and innoxious, nitrogen oxide in tail gas is reduced into nitrogen after redox reaction, pass through again the absorption of clean nitrogen tower, improve resource utilization, the present invention adopts low oxygen combustion technology, prevent from producing sulfur dioxide in combustion process, technique of the present invention is simple, cost is low.
The specific embodiment
Below in conjunction with specific embodiment, technical scheme of the present invention is described in detail.
Embodiment 1:
Tail gas is carried out to atomization, and send in dissolving tank and carry out dust removal process, form low dust tail gas; Low dust tail gas is carried out to heat treated, form high-temperature tail gas, temperature is 85 ℃ of left and right; The ammoniacal liquor that high-temperature tail gas is 20tt through blower fan with basicity fully contacts, and generates ammonium sulfite, and circulation fluid ammoniacal liquor pressurizes through pump, and after atomization, with tail gas hybrid reaction again, this step cycle 1 time, until tail gas medium sulphide content content reaches environmental standard; After tail gas is sent into boiler furnace and fully mixed with desulfurizing agent agstone afterwards, reaction generates calcium sulfate; Tail gas fully contacts with water, filters the calcium sulfate producing, and forms liquid product; Tail gas gasifies, and mixes in reactor with the hydrogen through preheating, and reaction temperature is 550 ℃, and redox reaction occurs, and produces nitrogen; The tail gas being reduced is sent into ammonia-cleaning tower to be absorbed with desalted water; Finally tail gas is sent into oxygen content and be in 5.5% boiler and carry out low oxygen combustion.
Tail gas after mixed tail gas burning meets the relevant environmental protection standard of country, directly enters atmosphere, does not pollute the environment, and due to process dust removal process, tail gas dust content is in 100mg/Nm3.
Embodiment 2:
Tail gas is carried out to atomization, and send in dissolving tank and carry out dust removal process, form low dust tail gas; Low dust tail gas is carried out to heat treated, form high-temperature tail gas, temperature is 85 ℃ of left and right; The ammoniacal liquor that high-temperature tail gas is 23tt through blower fan with basicity fully contacts, and generates ammonium sulfite, and circulation fluid ammoniacal liquor pressurizes through pump, and after atomization, with tail gas hybrid reaction again, this step cycle 2 times, until tail gas medium sulphide content content reaches environmental standard; After tail gas is sent into boiler furnace and fully mixed with desulfurizing agent agstone afterwards, reaction generates calcium sulfate; Tail gas fully contacts with water, filters the calcium sulfate producing, and forms liquid product; Tail gas gasifies, and mixes in reactor with the CO gas through preheating, and reaction temperature is 650 ℃, and redox reaction occurs, and produces nitrogen; The tail gas being reduced is sent into ammonia-cleaning tower to be absorbed with desalted water; Finally tail gas is sent into oxygen content and be in 6.0% boiler and carry out low oxygen combustion.
In tail gas after mixed tail gas burning, sulfur content is 0.01 ~ 0.02%, and amount of nitrogen oxides is less than 150ppm, meets the relevant environmental protection standard of country, directly enters atmosphere, does not pollute the environment, and due to process dust removal process, tail gas dust content is in 100mg/Nm3.
Embodiment 3:
Tail gas is carried out to atomization, and send in dissolving tank and carry out dust removal process, form low dust tail gas; Low dust tail gas is carried out to heat treated, form high-temperature tail gas, temperature is 85 ℃ of left and right; The ammoniacal liquor that high-temperature tail gas is 25tt through blower fan with basicity fully contacts, and generates ammonium sulfite, and circulation fluid ammoniacal liquor pressurizes through pump, after atomization, with tail gas hybrid reaction again, until tail gas medium sulphide content content reaches environmental standard; After tail gas is sent into boiler furnace and fully mixed with desulfurizing agent agstone afterwards, reaction generates calcium sulfate; Tail gas fully contacts with water, filters the calcium sulfate producing, and forms liquid product; Tail gas gasifies, and in reactor, mixes with Co mixed gas with the hydrogen through preheating, and reaction temperature is 650 ℃, and redox reaction occurs, and produces nitrogen, and in mist, hydrogen accounts for 15%, and carbon monoxide accounts for 3%, and other are hydrocarbon; The tail gas being reduced is sent into ammonia-cleaning tower to be absorbed with desalted water; Finally tail gas is sent into oxygen content and be in 6.5% boiler and carry out low oxygen combustion.
Tail gas after mixed tail gas burning meets the relevant environmental protection standard of country, directly enters atmosphere, does not pollute the environment, and due to process dust removal process, tail gas dust content is in 100mg/Nm3.
Claims (6)
1. exhaust gas treating method, is characterized in that: comprise the following steps:
Tail gas is carried out to atomization, and send in dissolving tank and carry out dust removal process, form low dust tail gas;
Tail gas by step in a) carries out heat treated, forms high-temperature tail gas;
High-temperature tail gas fully contacts with ammoniacal liquor through blower fan, generates ammonium sulfite;
After tail gas after step c) is sent into boiler furnace and fully mixed with desulfurizing agent agstone, reaction generates calcium sulfate;
The tail gas of step d) is fully contacted with water, filter the calcium sulfate producing, form liquid product;
By the tail gas gasification of step e), and mix in reactor with the reducing gas through preheating, redox reaction occurs;
The tail gas being reduced in step f) is sent into ammonia-cleaning tower to be absorbed with desalted water;
Tail gas in step g) is sent into and in boiler, carried out low oxygen combustion.
2. exhaust gas treating method according to claim 1, is characterized in that: the ammoniacal liquor in described step c) is as circulation fluid, and basicity is 20 ~ 25tt.
3. exhaust gas treating method according to claim 2, is characterized in that: described circulation fluid pressurizes through pump, after atomization, with tail gas after step c) hybrid reaction again.
4. exhaust gas treating method according to claim 1, is characterized in that: described reducing gas is a kind of or both mists in hydrogen or carbon monoxide.
5. exhaust gas treating method according to claim 1, is characterized in that: described step f) reaction temperature is 550 ~ 750 ℃.
6. exhaust gas treating method according to claim 1, is characterized in that: described step h) in boiler, oxygen content is controlled at 5.5 ~ 6.5%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310485441.0A CN103521048A (en) | 2013-10-17 | 2013-10-17 | Tail gas treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310485441.0A CN103521048A (en) | 2013-10-17 | 2013-10-17 | Tail gas treatment method |
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| Publication Number | Publication Date |
|---|---|
| CN103521048A true CN103521048A (en) | 2014-01-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310485441.0A Pending CN103521048A (en) | 2013-10-17 | 2013-10-17 | Tail gas treatment method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103521048A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104496605A (en) * | 2014-12-24 | 2015-04-08 | 金正大诺泰尔化学有限公司 | Method and device for recycling sulfur dioxide in furnace gas to produce alkali fertilizer |
| CN105783001A (en) * | 2016-04-11 | 2016-07-20 | 范祖联 | Boiler flue gas conversion and combustion device |
| CN113842767A (en) * | 2021-10-23 | 2021-12-28 | 安徽省华鑫铅业集团有限公司 | Tail gas treatment method based on gravity and pulse bag type dust removal |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1068753A (en) * | 1992-02-14 | 1993-02-10 | 殷斌友 | Process and equipment for treating nitric acid tail gas by ammoniated ammonium nitrate absorption method |
| US20030175190A1 (en) * | 2001-12-06 | 2003-09-18 | Powerspan Corp. | NOx, Hg, and SO2 removal using ammonia |
| US20060045802A1 (en) * | 2004-08-27 | 2006-03-02 | Alstom Technology Ltd. | APC process parameter estimation |
| CN101623591A (en) * | 2009-08-10 | 2010-01-13 | 杭州蓝海环保工程有限公司 | Desulfurization and denitrification oxidation process of single-stage catalytic reduction absorption method |
-
2013
- 2013-10-17 CN CN201310485441.0A patent/CN103521048A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1068753A (en) * | 1992-02-14 | 1993-02-10 | 殷斌友 | Process and equipment for treating nitric acid tail gas by ammoniated ammonium nitrate absorption method |
| US20030175190A1 (en) * | 2001-12-06 | 2003-09-18 | Powerspan Corp. | NOx, Hg, and SO2 removal using ammonia |
| US20060045802A1 (en) * | 2004-08-27 | 2006-03-02 | Alstom Technology Ltd. | APC process parameter estimation |
| CN101623591A (en) * | 2009-08-10 | 2010-01-13 | 杭州蓝海环保工程有限公司 | Desulfurization and denitrification oxidation process of single-stage catalytic reduction absorption method |
Non-Patent Citations (2)
| Title |
|---|
| 易思红等: "低浓度二氧化硫烟气脱硫技术进展", 《广西轻工业》, no. 11, 30 November 2007 (2007-11-30) * |
| 曹军: "含氮氧化物（NOx）废气的处理方法", 《河北化工》, vol. 30, no. 3, 31 March 2007 (2007-03-31), pages 45 - 1 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104496605A (en) * | 2014-12-24 | 2015-04-08 | 金正大诺泰尔化学有限公司 | Method and device for recycling sulfur dioxide in furnace gas to produce alkali fertilizer |
| CN105783001A (en) * | 2016-04-11 | 2016-07-20 | 范祖联 | Boiler flue gas conversion and combustion device |
| CN113842767A (en) * | 2021-10-23 | 2021-12-28 | 安徽省华鑫铅业集团有限公司 | Tail gas treatment method based on gravity and pulse bag type dust removal |
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Application publication date: 20140122 |