CN108730679B - Corrosion-resistant analysis gas exhaust system - Google Patents
Corrosion-resistant analysis gas exhaust system Download PDFInfo
- Publication number
- CN108730679B CN108730679B CN201810904634.8A CN201810904634A CN108730679B CN 108730679 B CN108730679 B CN 108730679B CN 201810904634 A CN201810904634 A CN 201810904634A CN 108730679 B CN108730679 B CN 108730679B
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- Prior art keywords
- valve
- pneumatic
- compressed air
- main pipe
- gas
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- 238000004458 analytical method Methods 0.000 title claims abstract description 31
- 238000005260 corrosion Methods 0.000 title claims abstract description 24
- 230000007797 corrosion Effects 0.000 title claims abstract description 13
- 239000007789 gas Substances 0.000 claims abstract description 61
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000003546 flue gas Substances 0.000 claims abstract description 25
- 230000008929 regeneration Effects 0.000 claims abstract description 21
- 238000011069 regeneration method Methods 0.000 claims abstract description 21
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 19
- 230000023556 desulfurization Effects 0.000 claims abstract description 19
- 239000006227 byproduct Substances 0.000 claims abstract description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 25
- 229910052799 carbon Inorganic materials 0.000 claims description 20
- 239000003054 catalyst Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 12
- 238000005070 sampling Methods 0.000 claims description 11
- 239000002253 acid Substances 0.000 claims description 6
- 230000003111 delayed effect Effects 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 description 11
- 238000001816 cooling Methods 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 5
- 238000004321 preservation Methods 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 239000000112 cooling gas Substances 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 239000003463 adsorbent Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 238000006555 catalytic reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
Abstract
The invention discloses an anti-corrosion analytic gas exhaust system, which comprises a main pipe, a compressed air pipeline and a bypass branch pipe; the two ends of the main pipe are respectively connected with an analytic gas outlet of the regeneration tower and a byproduct system; one end of the bypass branch pipe is connected with the main pipe, the other end of the bypass branch pipe is connected with a flue gas inlet of a desulfurization and denitrification tower in the flue gas desulfurization and denitrification system, and a third pneumatic on-off valve is arranged on the bypass branch pipe; one end of the compressed air pipeline is connected with the main pipe, the other end of the compressed air pipeline is connected with a compressed air source, and a fourth pneumatic on-off valve is arranged on the compressed air pipeline; a first pneumatic on-off valve is arranged on the main pipe and between the analytic gas outlet and the compressed air pipeline; and a second pneumatic on-off valve is arranged on the main pipe and between the compressed air pipeline and the byproduct system. According to the invention, through the arrangement of the compressed air pipeline, compressed air can be led into the main pipe when the system is stopped, residual analysis gas in the main pipe is discharged from the flue gas inlet or the byproduct system, and replacement of the analysis gas is performed, so that corrosion to the valve and the pipeline is prevented.
Description
Technical Field
The invention belongs to the field of environmental engineering, and particularly relates to an anti-corrosion system for exhausting high Wen Jiexi gas in a regeneration process in a boiler flue gas combined desulfurization and denitrification device with a carbon-based catalyst as an adsorbent and a catalyst.
Background
The carbon-based catalyst flue gas desulfurization and denitration technology principle is as follows: SO in flue gas under the adsorption and catalysis actions of carbon-based catalyst 2 And O 2 H and H 2 0 reacts to generate H 2 SO 4 ，H 2 SO 4 Adsorbing on the surface of the carbon-based catalyst; simultaneously, by utilizing the catalytic performance of the carbon-based catalyst, NOx in the flue gas and ammonia gas undergo catalytic reduction reaction to generate N 2 Realize desulfurization and denitrification of flue gas, and recycle the carbon-based catalyst after the adsorption catalytic reaction. Ammonia gas is injected into the desulfurization and denitrification device for realizing the denitrification reaction in the flue gas purification process, and NOx in the flue gas is converted into N 2 。
In the actual production process, the high temperature and high concentration SO are contained 2 Since valves and pipes are extremely corroded during operation, those skilled in the art have been working on developing a system for exhausting the analytic gases which satisfies smooth transportation of the analytic gases and prevents corrosion of the valves and pipes.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides an exhaust system capable of effectively preventing high Wen Jiexi gas from corroding pipelines and valves.
In order to achieve the above object, the present invention provides an anti-corrosion analytic gas exhaust system, which is connected to a regeneration tower in a flue gas desulfurization and denitrification system, and is used for exhausting analytic gas formed in a carbon-based catalyst regeneration process after adsorbing flue gas to a byproduct system; the anti-corrosion analytic gas exhaust system comprises a main pipe, a compressed air pipeline and a bypass branch pipe; the two ends of the main pipe are respectively connected with an analytic gas outlet of the regeneration tower and a byproduct system; one end of the bypass branch pipe is connected with the main pipe, the other end of the bypass branch pipe is connected with a flue gas inlet of a desulfurization and denitrification tower in the flue gas desulfurization and denitrification system, and a third pneumatic on-off valve is arranged on the bypass branch pipe; one end of the compressed air pipeline is connected with the main pipe, the other end of the compressed air pipeline is connected with a compressed air source, and a fourth pneumatic on-off valve is arranged on the compressed air pipeline; a first pneumatic on-off valve is arranged on the main pipe and between the analytic gas outlet and the compressed air pipeline; and a second pneumatic on-off valve is arranged on the main pipe and between the compressed air pipeline and the byproduct system.
Through the arrangement of the compressed air pipeline, when the system is stopped, compressed air can be led into the main pipe, residual analysis gas in the main pipe is discharged from the flue gas inlet or the byproduct system, and replacement of the analysis gas is carried out, so that corrosion to the valve and the pipeline is prevented. And meanwhile, due to the arrangement of the bypass branch pipe, when a byproduct system fails, the analysis gas can be introduced into the desulfurization and denitrification tower.
Further, the anti-corrosion analytic gas exhaust system also comprises a sampling branch pipe; one end of the sampling branch pipe is connected with the main pipe, and a manual valve is arranged on the sampling branch pipe.
The setting of this sampling branch pipe conveniently draws the analysis gas and carries out the chemical examination.
Further, heat preservation layers are arranged outside the main pipe and the bypass branch pipe.
Further, the outside of the sampling branch pipe and the compressed air pipeline is provided with an insulating layer.
Through the arrangement of the pipeline heat insulation layer, the corrosion to the pipeline caused by the reduction of the high Wen Jiexi gas temperature can be avoided. The arrangement of the heat preservation layer can also be replaced by other heat preservation measures.
Further, electric heaters are arranged on the first pneumatic on-off valve, the second pneumatic on-off valve, the third pneumatic on-off valve, the fourth pneumatic on-off valve and the manual valve.
The electric heaters of all valves are started in advance before the system is started, the valves are heated to the temperature close to the temperature of the analysis gas, and the high-temperature analysis gas is prevented from contacting the valves at normal temperature in the starting process to generate acid dew corrosion valves.
Compared with the prior art, the invention has the following advantages:
according to the invention, through the arrangement of the compressed air pipeline, compressed air can be led into the main pipe when the system is stopped, residual analysis gas in the main pipe is discharged from the flue gas inlet or the byproduct system, and replacement of the analysis gas is performed, so that corrosion to the valve and the pipeline is prevented. And meanwhile, due to the arrangement of the bypass branch pipe, when a byproduct system fails, the analysis gas can be introduced into the desulfurization and denitrification tower.
Drawings
Fig. 1 is a schematic diagram of the structure of the corrosion-resistant analysis gas exhaust system of the present invention.
In the figure, 1-nitrogen gas first inlet; a 2-nitrogen second inlet; 3-a heating gas inlet; 4-a heating gas outlet; 5-cooling gas inlet; 6-a cooling gas outlet; 7-a resolving gas outlet; 8-resolving a gas header; 9-bypass branch pipe; 10-a third pneumatic on-off valve; 11-a first pneumatic on-off valve; 12-compressed air line; 13-fourth pneumatic on-off valve; 14-a manual valve for sampling; 15-a second pneumatic on-off valve; 16-a regeneration tower; 17-a desulfurization and denitrification tower; 18-a heating section; 19-transition section; 20-cooling section; 21-a byproduct system; 22-compressed air source.
Detailed Description
The following examples are illustrative only. The invention is capable of numerous modifications and variations in detail within the spirit and scope of the present invention. And the carbon-based catalyst mentioned in the present invention is modified activated carbon, belonging to one kind of activated carbon, and all the adsorbents belonging to the class of activated carbon include: conventional activated carbon, activated coke, carbon-based adsorbents, etc. are included within the scope of the present invention.
The following detailed description refers to the accompanying drawings.
As shown in fig. 1, an anti-corrosion analytic gas exhaust system of the present invention is connected to a regeneration tower 16 in a flue gas desulfurization and denitrification system, and is used for exhausting analytic gas formed in a carbon-based catalyst regeneration process after adsorbing flue gas to a byproduct system 21.
The specific process of recycling the carbon-based catalyst comprises the following steps: the flue gas enters the carbon-based catalyst adsorption layer from the inlet smoke box of the desulfurization and denitrification tower 17, and the purified flue gas is discharged into a chimney through the outlet smoke box. The carbon-based catalyst with saturated adsorption enters the regeneration tower 16 through a material circulation system; in the heating section 18 of the regeneration tower 16, circulating hot air passes through a shell pass, enters from a heating gas inlet 3 and is discharged from a heating gas outlet 4, a carbon-based catalyst passes through a tube pass and enters into the heating section from the upper part, when the heating section 18 carries out heating regeneration and reaches a transition section 19, the carbon-based catalyst is regenerated, analysis gas is separated from the carbon-based catalyst, analysis gas is discharged from an analysis gas outlet 7, and the carbon-based catalyst enters into a cooling section 20; in the cooling section 20 of the regeneration tower, cooling air passes through a shell pass, enters from a cooling gas inlet 5 and is discharged from a cooling gas outlet 6, a carbon-based catalyst passes through a tube pass, enters into the cooling section from the upper part, is cooled and is discharged out of the regeneration tower, and the material is circulatedThe ring system is transported to a desulfurization and denitrification tower for recycling; simultaneously, the upper part of the heating section 18 and the lower part 20 of the cooling section of the regeneration tower 16 respectively pass through the nitrogen first inlet 1 and the ammonia second inlet 2 and simultaneously introduce nitrogen into the tube side of the regeneration tower to protect the carbon-based catalyst, reduce burning loss and prevent fire in the heating regeneration process, and discharge the analysis gas released in the regeneration process from the analysis gas outlet 7 as carrier gas SO as to release SO 2 The volume ratio of the analysis gas is more than 20 percent, and the temperature is higher than 400 ℃, and the analysis gas is conveyed to a byproduct treatment system through the anti-corrosion analysis gas discharge system, so that the recycling utilization of sulfur is realized.
As shown in fig. 1, in the anti-corrosion analytic gas exhaust system, a first pneumatic on-off valve 11 and a second pneumatic on-off valve 15 are arranged on a main pipe 8, compressed air provides a gas source as driving power to control the on-off of a branch pipe, and the on-off control of an outlet of analytic flue gas of a regeneration tower and an inlet of a byproduct system can be realized respectively. The bypass branch pipe 9 is arranged on the main pipe 8, a third pneumatic on-off valve 10 is arranged on the bypass branch pipe 9, compressed air provides an air source as driving power, the on-off of the branch pipe is controlled, and the analysis gas can be introduced into the inlet of the desulfurization and denitrification tower when a byproduct system fails. And a manual valve 14 for sampling is arranged on the main pipe 8 and is used for extracting analysis gas to perform an assay. The compressed air pipeline 12 is arranged on the main pipe 8, a fourth pneumatic on-off valve 13 is arranged on the compressed air pipeline 12, the compressed air provides an air source as driving power, the on-off of the branch pipe is controlled, and the compressed air is used for replacing residual acid analysis gas in the main pipe 8 after stopping and preventing corrosion to valves and pipelines.
The main pipe 8 and the bypass branch pipe 9 take heat preservation measures to prevent the corrosion of the pipeline caused by the reduction of the high Wen Jiexi gas temperature.
The first pneumatic on-off valve 8, the second pneumatic on-off valve 15, the third pneumatic on-off valve 10, the fourth pneumatic on-off valve 13 and the manual valve 14 are all provided with electric heaters, and heat preservation measures are taken.
The electric heaters of all valves are started in advance before the system is started, the valves are heated to the temperature close to the temperature of the analysis gas, and the high-temperature analysis gas is prevented from contacting the valves at normal temperature in the starting process to generate acid dew corrosion valves.
And after the system is closed, the electric heaters of all valves are turned off in a delayed manner, and after the replacement of the residual acid analysis gas in the main pipe 8 is finished, the electric heaters are turned off, so that the valves are prevented from being corroded in the shutdown process of the system.
Claims (1)
1. An anti-corrosion analytic gas discharge system is connected with a regeneration tower in a flue gas desulfurization and denitrification system and is used for discharging analytic gas formed in the regeneration process of a carbon-based catalyst after adsorbing flue gas to a byproduct system; the method is characterized in that: the anti-corrosion analytic gas discharge system comprises a main pipe, a compressed air pipeline and a bypass branch pipe; the two ends of the main pipe are respectively connected with an analytic gas outlet of the regeneration tower and a byproduct system; one end of the bypass branch pipe is connected with the main pipe, the other end of the bypass branch pipe is connected with a flue gas inlet of a desulfurization and denitrification tower in the flue gas desulfurization and denitrification system, and a third pneumatic on-off valve is arranged on the bypass branch pipe; one end of the compressed air pipeline is connected with the main pipe, the other end of the compressed air pipeline is connected with a compressed air source, and a fourth pneumatic on-off valve is arranged on the compressed air pipeline; a first pneumatic on-off valve is arranged on the main pipe and positioned between the analytic gas outlet and the compressed air pipeline; a second pneumatic on-off valve is arranged on the main pipe and between the compressed air pipeline and the byproduct system; the anti-corrosion analytic gas exhaust system further comprises a sampling branch pipe; one end of the sampling branch pipe is connected with the main pipe, and a manual valve is arranged on the sampling branch pipe; an insulation layer is arranged outside the main pipe and the bypass branch pipe; the outside of the sampling branch pipe and the compressed air pipeline is provided with an insulating layer; the first pneumatic on-off valve, the second pneumatic on-off valve, the third pneumatic on-off valve, the fourth pneumatic on-off valve and the manual valve are all provided with electric heaters; all valves before the system is started, namely a first pneumatic on-off valve, a second pneumatic on-off valve, a third pneumatic on-off valve, a fourth pneumatic on-off valve and an electric heater of a manual valve are started in advance, the valves are heated to a temperature close to that of the analysis gas, and the analysis gas with high temperature is prevented from contacting the valves at normal temperature in the starting process to generate acid exposure corrosion valves; and after the system is closed, the electric heaters of all valves are turned off in a delayed manner, and after the replacement of the residual acid analysis gas in the main pipe is finished, the electric heaters are turned off, so that the valves are prevented from being corroded in the shutdown process of the system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810904634.8A CN108730679B (en) | 2018-08-09 | 2018-08-09 | Corrosion-resistant analysis gas exhaust system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810904634.8A CN108730679B (en) | 2018-08-09 | 2018-08-09 | Corrosion-resistant analysis gas exhaust system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108730679A CN108730679A (en) | 2018-11-02 |
| CN108730679B true CN108730679B (en) | 2023-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810904634.8A Active CN108730679B (en) | 2018-08-09 | 2018-08-09 | Corrosion-resistant analysis gas exhaust system |
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| CN (1) | CN108730679B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IN141353B (en) * | 1973-06-29 | 1977-02-19 | Bundy Corp | |
| JPH01130715A (en) * | 1987-11-17 | 1989-05-23 | Toho Kako Kensetsu Kk | Adsorption and desorption device |
| CN105865853A (en) * | 2016-05-16 | 2016-08-17 | 威海捷诺曼自动化科技有限公司 | Online analysis system of ship exhaust emission |
| CN106178811A (en) * | 2015-04-29 | 2016-12-07 | 湖南中冶长天节能环保技术有限公司 | Prevent from resolving activated carbon Thermal desorption method and the device thereof of gas line clogging |
| CN207371539U (en) * | 2017-10-20 | 2018-05-18 | 国电科学技术研究院 | Three-stage carbon base catalyst regenerates Tower System |
| CN108096988A (en) * | 2018-02-09 | 2018-06-01 | 中冶长天国际工程有限责任公司 | A kind of flue gas purifying method and system for realizing wastewater zero discharge |
| CN208719688U (en) * | 2018-08-09 | 2019-04-09 | 国电环境保护研究院有限公司 | A kind of anticorrosion parsing gas discharge system |
-
2018
- 2018-08-09 CN CN201810904634.8A patent/CN108730679B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IN141353B (en) * | 1973-06-29 | 1977-02-19 | Bundy Corp | |
| JPH01130715A (en) * | 1987-11-17 | 1989-05-23 | Toho Kako Kensetsu Kk | Adsorption and desorption device |
| CN106178811A (en) * | 2015-04-29 | 2016-12-07 | 湖南中冶长天节能环保技术有限公司 | Prevent from resolving activated carbon Thermal desorption method and the device thereof of gas line clogging |
| CN105865853A (en) * | 2016-05-16 | 2016-08-17 | 威海捷诺曼自动化科技有限公司 | Online analysis system of ship exhaust emission |
| CN207371539U (en) * | 2017-10-20 | 2018-05-18 | 国电科学技术研究院 | Three-stage carbon base catalyst regenerates Tower System |
| CN108096988A (en) * | 2018-02-09 | 2018-06-01 | 中冶长天国际工程有限责任公司 | A kind of flue gas purifying method and system for realizing wastewater zero discharge |
| CN208719688U (en) * | 2018-08-09 | 2019-04-09 | 国电环境保护研究院有限公司 | A kind of anticorrosion parsing gas discharge system |
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| CN108730679A (en) | 2018-11-02 |
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