CN114525142A - Method and system for treating ammonia-containing tail gas and simultaneously reducing nitrogen oxides in coke oven flue gas - Google Patents
Method and system for treating ammonia-containing tail gas and simultaneously reducing nitrogen oxides in coke oven flue gas Download PDFInfo
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- CN114525142A CN114525142A CN202210337344.6A CN202210337344A CN114525142A CN 114525142 A CN114525142 A CN 114525142A CN 202210337344 A CN202210337344 A CN 202210337344A CN 114525142 A CN114525142 A CN 114525142A
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- China
- Prior art keywords
- coke oven
- main pipe
- tail gas
- gas
- ammonia
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- 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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- 239000000571 coke Substances 0.000 title claims abstract description 112
- 239000007789 gas Substances 0.000 title claims abstract description 77
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 68
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 34
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 239000003546 flue gas Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000002485 combustion reaction Methods 0.000 claims abstract description 28
- 238000005406 washing Methods 0.000 claims abstract description 24
- 239000002253 acid Substances 0.000 claims abstract description 20
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 18
- 230000023556 desulfurization Effects 0.000 claims abstract description 18
- 238000000746 purification Methods 0.000 claims abstract description 17
- 238000003860 storage Methods 0.000 claims abstract description 13
- 239000000779 smoke Substances 0.000 claims abstract description 4
- 238000004140 cleaning Methods 0.000 claims description 12
- 239000003513 alkali Substances 0.000 claims description 5
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 3
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 2
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical group N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 2
- 239000003034 coal gas Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B21/00—Heating of coke ovens with combustible gases
- C10B21/10—Regulating and controlling the combustion
- C10B21/18—Recirculating the flue gases
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
- C10K1/10—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
- C10K1/10—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids
- C10K1/12—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids alkaline-reacting including the revival of the used wash liquors
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Treating Waste Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention relates to a method for treating ammonia-containing tail gas and simultaneously reducing nitrogen oxides in coke oven flue gas, which comprises the following steps: 1) collecting ammonia-containing tail gas generated by a storage tank of a gas purification system, and conveying the collected ammonia-containing tail gas to an acid washing tower through a pipeline for acid washing; 2) sending the tail gas after acid washing into an alkaline washing tower through a pipeline for alkaline washing, and then conveying the tail gas to a coke oven main pipe through a draught fan; 3) conveying the coke oven flue gas treated by the desulfurization and denitrification system to a coke oven main pipe through a pipeline; 4) the tail gas containing ammonia and the coke oven flue gas are merged at a main pipe and then are sent into the original coke oven combustion air system; the invention can treat the ammonia-containing tail gas of the gas purification system, and can reduce the content of nitrogen oxide in the coke oven smoke, thereby achieving two purposes and generating obvious economic benefit and environmental protection benefit.
Description
Technical Field
The invention relates to the technical field of coke oven production and operation, in particular to a method for treating ammonia-containing tail gas and reducing nitrogen oxides in coke oven smoke.
Background
During the production of the coke oven, coke oven gas or blast furnace gas is used as a combustion medium, and in the combustion process, because the temperature in a combustion chamber of the coke oven is high, the content of nitrogen oxides in the discharged flue gas reaches 500mg/m3, the processing load of a desulfurization and denitrification system is increased; on the other hand, in a gas purification system matched with coke oven production, the tail gas containing ammonia in the HPF desulfurization and ammonium sulfate part storage tanks is directly discharged, so that the environmental protection requirement cannot be met, and the equipment of the gas purification system is corroded.
Disclosure of Invention
The invention aims to solve the problems that the content of nitrogen oxides in the coke oven flue gas exceeds the standard and the ammonia-containing tail gas of a coal gas purification system is directly discharged, and provides a method for treating the ammonia-containing tail gas and reducing the nitrogen oxides in the coke oven flue gas.
The specific scheme of the invention is as follows: the method for treating ammonia-containing tail gas and simultaneously reducing nitrogen oxides in coke oven flue gas comprises the following steps:
1) collecting ammonia-containing tail gas generated by a storage tank of a gas purification system, and conveying the collected ammonia-containing tail gas to an acid washing tower through a pipeline for acid washing;
2) sending the tail gas after acid washing into an alkaline washing tower through a pipeline for alkaline washing, and then conveying the tail gas to a coke oven main pipe through a draught fan;
3) conveying the coke oven flue gas treated by the desulfurization and denitrification system to a coke oven main pipe through a pipeline;
4) the tail gas containing ammonia and the coke oven flue gas are merged and then sent into the original coke oven combustion air system.
In the step 4), the mixed gas after being converged is divided into two parts, one part is sent to the machine side of the coke oven, and the other part is sent to the coke side of the coke oven.
The ratio of the coke oven smoke to the tail gas containing ammonia is 2:1, and the ratio of the mixed gas to the air sucked by the original coke oven combustion-supporting air system is 1: 3.
The invention also provides a system for treating ammonia-containing tail gas and simultaneously reducing nitrogen oxides in coke oven flue gas by adopting the method, which comprises a gas purification system storage tank, an acid cleaning tower, an alkali cleaning tower, a desulfurization and denitrification system and a coke oven combustion chamber, wherein the gas purification system storage tank, the acid cleaning tower and the alkali cleaning tower are sequentially connected through a conveying pipeline A, the output end of the desulfurization and denitrification system is provided with a conveying pipeline B, the conveying pipeline A and the conveying pipeline B are jointly connected to a coke oven main pipe, the coke oven main pipe is provided with a flow meter, the conveying pipeline B is provided with an adjusting valve, the flow meter is in signal connection with the adjusting valve, and the flow meter monitors the flow of mixed gas input into the coke oven and feeds back to control the opening of the adjusting valve; the coke oven main pipe is provided with two branch pipes, the two branch pipes are respectively connected to the machine side and the coke side of the coke oven combustion system, the tail gas of the coke oven combustion system is provided with a drainage pipe, and the drainage pipe is connected to the input end of the desulfurization and denitrification system.
The coke oven main pipe is provided with a main pipe A and a main pipe B, one end of the main pipe A and one end of the main pipe B are connected with the coke oven main pipe together, the main pipe A is provided with two branch pipes A, the main pipe B is provided with two branch pipes B, the two branch pipes A are connected to the coke oven side and the coke side respectively, the two branch pipes B are connected to the coke oven side and the coke side respectively, the branch pipes A are connected with single-number combustion systems of the coke oven side and the coke side, the branch pipes B are connected with double-number combustion systems of the coke oven side and the coke side, a single-number valve is arranged on the main pipe A, and a double-number valve is arranged on the main pipe B.
Compared with the prior art, the invention has the following advantages: 1. tail gas obtained after collection treatment of the ammonia-containing tail gas in the HPF desulfurization and ammonium sulfate partial storage tank and 20-30% of coke oven exhaust gas are conveyed into a coke oven heating system waste gas shutter through a pipeline and used as part of combustion-supporting air, so that the oxygen content of the combustion-supporting air of a combustion system is reduced, the combustion intensity during combustion is controlled, the generation amount of nitrogen oxides is reduced by 30% -40%, and the nitrogen oxide generation amount is reduced to below 300mg/m 3; 2. the treatment load of a desulfurization and denitrification system is reduced, the direct discharge of tail gas of a gas purification system is avoided, and the cost of an exhaust funnel is reduced; 3. the temperature of the flue gas is about 230 ℃, and after the flue gas is mixed with the tail gas of the coal gas purification system, the temperature of the partial mixed gas reaches more than 150 ℃, so that the waste heat of the flue gas is fully utilized.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
in the figure: 1-a gas purification system storage tank, 2-an acid washing tower, 3-an alkali washing tower, 4-an induced draft fan, 5-a flowmeter, 6-an adjusting valve, 7-the induced draft fan, 8-a desulfurization and denitrification system, 9-a single valve, 10-a double valve, 11-a branch pipe A, 12-a branch pipe B, 13-a coke oven combustion chamber, 14-a combustion system, 15-a conveying pipeline A, 16-a conveying pipeline B, 17-a coke oven main pipe.
Detailed Description
The method for treating ammonia-containing tail gas and reducing nitrogen oxides in coke oven flue gas comprises the following steps:
1) collecting ammonia-containing tail gas generated by a storage tank of a gas purification system, and conveying the collected ammonia-containing tail gas to an acid washing tower through a pipeline for acid washing;
2) sending the tail gas after acid washing into an alkaline washing tower through a pipeline for alkaline washing, removing impurities such as tar, naphthalene, ammonia, H2S and the like in the tail gas after acid washing and alkaline washing, and then conveying the tail gas to a coke oven main pipe through a draught fan;
3) conveying part of coke oven flue gas treated by the desulfurization and denitrification system to a coke oven main pipe through a pipeline;
4) the tail gas containing ammonia and the coke oven flue gas are merged and then sent into the original coke oven combustion air system.
In the step 4) of the embodiment, the mixed gas after being merged is divided into two parts, one part is sent to the machine side of the coke oven, and the other part is sent to the coke side of the coke oven.
In the embodiment, the ratio of the coke oven flue gas to the tail gas containing ammonia is 2:1, and the ratio of the mixed gas to the air sucked by the original coke oven combustion air system is 1: 3.
The embodiment also provides a system for treating ammonia-containing tail gas and simultaneously reducing nitrogen oxides in coke oven flue gas by adopting the method, which comprises a gas purification system storage tank 1, an acid cleaning tower 2, an alkaline cleaning tower 3, a desulfurization and denitrification system 8 and a coke oven combustion chamber 13, wherein a tail gas end of the coke oven combustion chamber is provided with a drainage pipe, the drainage pipe is connected to an 8 input end of the desulfurization and denitrification system, the gas purification system storage tank 1, the acid cleaning tower 2 and the alkaline cleaning tower 3 are sequentially connected through a conveying pipeline A15, a draught fan 4 is arranged on a conveying pipeline A15, an output end of the desulfurization and denitrification system 8 is provided with a conveying pipeline B16, a draught fan 7 is arranged on a conveying pipeline B16, the conveying pipeline A15 and the conveying pipeline B16 are jointly connected to a coke oven main pipe 17, a flow meter 5 is arranged on the coke oven main pipe 17, an adjusting valve 6 is arranged on the conveying pipeline B16, the flow meter 5 is in signal connection with the adjusting valve 6, the flow meter 5 monitors the flow of the mixed gas input into the coke oven and feeds back to control the opening degree of the adjusting valve 6 so that the mixed gas and the air The ratio is maintained within a suitable range; the coke oven main pipe 17 is provided with a main pipe A and a main pipe B, one end of the main pipe A and one end of the main pipe B are connected with the coke oven main pipe 17 together, the main pipe A is provided with two branch pipes A11, the main pipe B is provided with two branch pipes B12, the two branch pipes A11 are connected to the coke oven side and the coke side respectively, the two branch pipes B12 are connected to the coke oven side and the coke side respectively, the branch pipe A11 is connected with a single-number combustion system 14 of the coke oven side and the coke side, the branch pipe B12 is connected with a double-number combustion system 14 of the coke oven side and the coke side, the main pipe A is provided with a single-number valve 9, the main pipe B is provided with a double-number valve 10, the single-number valve 9 and the double-number valve 10 are interlocked through a switch and are matched with the original heating system of the coke oven in a reversing action, and when the control system controls the single-number valve 9 to enter air, the double-number valve 10 is closed; when the double valve 10 is in air inlet, the single valve 9 is closed, and the single valve and the double valve are switched on and off for 1 time every 30 minutes.
Claims (5)
1. The method for treating ammonia-containing tail gas and simultaneously reducing nitrogen oxides in coke oven flue gas is characterized by comprising the following steps: the method comprises the following steps:
1) collecting ammonia-containing tail gas generated by a storage tank of a gas purification system, and conveying the collected ammonia-containing tail gas to an acid washing tower through a pipeline for acid washing;
2) sending the tail gas after acid washing into an alkaline washing tower through a pipeline for alkaline washing, and then conveying the tail gas to a coke oven main pipe through a draught fan;
3) conveying the coke oven flue gas treated by the desulfurization and denitrification system to a coke oven main pipe through a pipeline;
4) the tail gas containing ammonia and the coke oven flue gas are merged and then sent into the original coke oven combustion air system.
2. The method for treating ammonia-containing tail gas and simultaneously reducing nitrogen oxides in coke oven flue gas according to claim 1, which is characterized by comprising the following steps of: and 4) dividing the merged mixed gas into two parts, wherein one part is sent to the machine side of the coke oven, and the other part is sent to the coke side of the coke oven.
3. The method for treating ammonia-containing tail gas and simultaneously reducing nitrogen oxides in coke oven flue gas according to claim 1, which is characterized by comprising the following steps of: the ratio of the coke oven smoke to the tail gas containing ammonia is 2:1, and the ratio of the mixed gas to the air sucked by the original coke oven combustion air system is 1: 3.
4. A system for treating ammonia-containing tail gas and simultaneously reducing nitrogen oxides in coke oven flue gas by adopting any one of claims 1 to 3, which is characterized in that: the device comprises a gas purification system storage tank, an acid cleaning tower, an alkali cleaning tower, a desulfurization and denitrification system and a coke oven combustion chamber, wherein the gas purification system storage tank, the acid cleaning tower and the alkali cleaning tower are sequentially connected through a conveying pipeline A, the output end of the desulfurization and denitrification system is provided with a conveying pipeline B, the conveying pipeline A and the conveying pipeline B are jointly connected to a coke oven main pipe, a flow meter is arranged on the coke oven main pipe, an adjusting valve is arranged on the conveying pipeline B, the flow meter is in signal connection with the adjusting valve, and the flow meter monitors the flow of mixed gas input into a coke oven and controls the opening of the adjusting valve in a feedback manner; the coke oven main pipe is provided with two branch pipes, the two branch pipes are respectively connected to the machine side and the coke side of the coke oven combustion system, the tail gas of the coke oven combustion system is provided with a drainage pipe, and the drainage pipe is connected to the input end of the desulfurization and denitrification system.
5. The system for treating tail gas containing ammonia and simultaneously reducing nitrogen oxides in coke oven flue gas according to claim 4, is characterized in that: the coke oven main pipe is provided with a main pipe A and a main pipe B, one ends of the main pipe A and the main pipe B are connected with the coke oven main pipe together, the main pipe A is provided with two branch pipes A, the main pipe B is provided with two branch pipes B, the two branch pipes A are connected to the coke oven side and the coke side respectively, the two branch pipes B are connected to the coke oven side and the coke side respectively, the branch pipes A are connected with a single number combustion system of the coke oven side and the coke side, the branch pipes B are connected with a double number combustion system of the coke oven side and the coke side, a single number valve is arranged on the main pipe A, and a double number valve is arranged on the main pipe B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210337344.6A CN114525142A (en) | 2022-04-01 | 2022-04-01 | Method and system for treating ammonia-containing tail gas and simultaneously reducing nitrogen oxides in coke oven flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210337344.6A CN114525142A (en) | 2022-04-01 | 2022-04-01 | Method and system for treating ammonia-containing tail gas and simultaneously reducing nitrogen oxides in coke oven flue gas |
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| Publication Number | Publication Date |
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| CN114525142A true CN114525142A (en) | 2022-05-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210337344.6A Pending CN114525142A (en) | 2022-04-01 | 2022-04-01 | Method and system for treating ammonia-containing tail gas and simultaneously reducing nitrogen oxides in coke oven flue gas |
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| CN (1) | CN114525142A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6349603A (en) * | 1986-08-18 | 1988-03-02 | Sumitomo Metal Ind Ltd | Heating furnace facility |
| DE3911295A1 (en) * | 1988-04-24 | 1989-11-09 | Still Otto Gmbh | Process and equipment for reducing the nitrogen oxide content of flue gases from coke oven batteries |
| CN105295962A (en) * | 2014-07-28 | 2016-02-03 | 宝山钢铁股份有限公司 | Method and device for reducing emission of NOx in waste flue gas of coke oven |
| CN109847546A (en) * | 2019-02-15 | 2019-06-07 | 邢台恒禄科技有限公司 | A kind of environmental protection zero-emission tail gas treatment process |
| CN110841461A (en) * | 2019-12-11 | 2020-02-28 | 陕西黑猫焦化股份有限公司 | Coking chemical production area VOCs purification environment-friendly recovery process and system |
-
2022
- 2022-04-01 CN CN202210337344.6A patent/CN114525142A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6349603A (en) * | 1986-08-18 | 1988-03-02 | Sumitomo Metal Ind Ltd | Heating furnace facility |
| DE3911295A1 (en) * | 1988-04-24 | 1989-11-09 | Still Otto Gmbh | Process and equipment for reducing the nitrogen oxide content of flue gases from coke oven batteries |
| CN105295962A (en) * | 2014-07-28 | 2016-02-03 | 宝山钢铁股份有限公司 | Method and device for reducing emission of NOx in waste flue gas of coke oven |
| CN109847546A (en) * | 2019-02-15 | 2019-06-07 | 邢台恒禄科技有限公司 | A kind of environmental protection zero-emission tail gas treatment process |
| CN110841461A (en) * | 2019-12-11 | 2020-02-28 | 陕西黑猫焦化股份有限公司 | Coking chemical production area VOCs purification environment-friendly recovery process and system |
Non-Patent Citations (1)
| Title |
|---|
| MAHIN RAMESHNI等: "硫磺回收装置复杂原料气的处理", 《硫酸工业》 * |
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Application publication date: 20220524 |