CN115305121A - Process method for improving oxygen utilization rate in HPF (high pressure fluidized bed) desulfurization regeneration air - Google Patents
Process method for improving oxygen utilization rate in HPF (high pressure fluidized bed) desulfurization regeneration air Download PDFInfo
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- CN115305121A CN115305121A CN202110499716.0A CN202110499716A CN115305121A CN 115305121 A CN115305121 A CN 115305121A CN 202110499716 A CN202110499716 A CN 202110499716A CN 115305121 A CN115305121 A CN 115305121A
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 168
- 230000023556 desulfurization Effects 0.000 title claims abstract description 168
- 230000008929 regeneration Effects 0.000 title claims abstract description 128
- 238000011069 regeneration method Methods 0.000 title claims abstract description 128
- 238000000034 method Methods 0.000 title claims abstract description 53
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 27
- 239000001301 oxygen Substances 0.000 title claims abstract description 27
- 239000007789 gas Substances 0.000 claims abstract description 45
- 239000003034 coal gas Substances 0.000 claims abstract description 33
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 18
- 230000003647 oxidation Effects 0.000 claims abstract description 16
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 11
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 10
- 230000001172 regenerating effect Effects 0.000 claims abstract description 6
- 238000005507 spraying Methods 0.000 claims abstract description 6
- 238000010521 absorption reaction Methods 0.000 claims abstract description 5
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 5
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 10
- 239000003054 catalyst Substances 0.000 claims description 8
- 239000006260 foam Substances 0.000 claims description 7
- 229910052717 sulfur Inorganic materials 0.000 claims description 7
- 239000011593 sulfur Substances 0.000 claims description 7
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 claims description 6
- 238000007255 decyanation reaction Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 2
- 239000000945 filler Substances 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims 1
- 238000006555 catalytic reaction Methods 0.000 abstract 1
- 238000007599 discharging Methods 0.000 abstract 1
- 230000001590 oxidative effect Effects 0.000 abstract 1
- 238000004064 recycling Methods 0.000 abstract 1
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000003891 ferrous sulphate Nutrition 0.000 description 1
- 239000011790 ferrous sulphate Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- -1 titanium cobalt cyansulfonate ammonium Chemical compound 0.000 description 1
- 238000009279 wet oxidation reaction Methods 0.000 description 1
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- 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
- C10K1/002—Removal of contaminants
- C10K1/003—Removal of contaminants of acid contaminants, e.g. acid gas removal
- C10K1/004—Sulfur containing contaminants, e.g. hydrogen sulfide
-
- 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
- C10K1/002—Removal of contaminants
-
- 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
-
- 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
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/584—Recycling of catalysts
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Gas Separation By Absorption (AREA)
- Industrial Gases (AREA)
Abstract
The invention discloses a process method for improving the utilization rate of oxygen in residual air generated by desulfurization regeneration by an HPF method, which comprises the following steps: 1. coal gas enters a desulfurizing tower through the bottom part of a primary desulfurizing tower, and desulfurizing liquid is sprayed on the top of the tower; 2. delivering the desulfurization solution collected at the bottom of the tower to a first-stage desulfurization regeneration tower, and oxidizing and regenerating the desulfurization solution by compressed air under the catalysis of HPF; 3. the regenerated barren solution is sent to a first-stage desulfurization regeneration tower for cyclic spraying; 4. the regenerated tail gas escaping from the primary desulfurization regeneration tower is forcibly injected into the secondary desulfurization regeneration tower to be used for regenerating desulfurization liquid generated by secondary desulfurization; the regeneration tower is of a tower structure and comprises a lower desulfurization area and an upper regeneration area; 5. delivering the desulfurization solution extracted from the tower bottom of the secondary desulfurization regeneration tower to a regeneration area for oxidation regeneration and cyclic spraying; 6. the gas desulfurized and decyanated by the secondary desulfurization regeneration tower is sent to a subsequent ammonia absorption unit; 7. and (4) recycling the regenerated tail gas from the regeneration area of the secondary desulfurization regeneration tower to a coal gas main pipe behind the secondary desulfurization regeneration tower without discharging.
Description
Technical Field
The invention belongs to the technical field of coke oven gas purification, and particularly relates to a process method for improving the utilization rate of oxygen in HPF (high pressure fluidized bed) desulfurization regeneration air.
Background
HPF method [ H (Hydroquinone), P (binuclear titanium cobalt cyansulfonate ammonium), F (ferrous sulfate)]The coke oven gas desulfurization and decyanation process is a wet oxidation method gas desulfurization process widely used in China. In order to improve the desulfurization efficiency of the coal gas, two-stage desulfurization is generally adopted to ensure that the coal gas desulfurization outlet H is 2 The S content is controlled at 50mg/m 3 The following.
Each stage of desulfurization is to introduce compressed air into the regeneration tower respectively, and the desulfurization solution is oxidized and regenerated by using a dispersing bubbling or nozzle, and the oxygen content in the regenerated tail gas is 15-17% by volume concentration.
In the prior art, the regenerated tail gas is generally treated by adopting methods such as acid washing, alkali washing, adsorption and the like and then discharged into the atmosphere. The tail gas treatment mode is difficult to eradicate the influence of the discharged regeneration tail gas on the environment.
Therefore, a new process needs to be developed to improve the utilization rate of oxygen in the regeneration air, reduce the oxygen content in the regeneration tail gas and eliminate the influence of the regeneration tail gas emission on the environment.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects in the prior art, and provide a new process capable of improving the oxygen utilization rate of the air desulfurized and regenerated by the HPF method, so as to reduce the oxygen content in the regenerated tail gas, recycle the regenerated tail gas into coal gas and eliminate the influence of the discharge of the regenerated tail gas on the environment on the premise of ensuring the desulfurization effect.
The technical problem to be solved can be implemented by the following technical scheme.
A process method for improving the utilization rate of oxygen in residual air generated by desulfurization and regeneration of an HPF method is characterized by comprising the following steps:
(1) The coal gas enters a primary HPF desulfurization tower through the bottom of the primary HPF desulfurization tower, and desulfurization liquid is sprayed on the top of the tower;
(2) Sending the desulfurization solution collected at the bottom of the primary HPF desulfurization tower to a primary desulfurization regeneration tower, and carrying out oxidation regeneration on the desulfurization solution by compressed air sent into the tower under the action of an HPF catalyst;
(3) The regenerated barren solution is collected and then pumped to the top of a first-stage desulfurizing tower to be circularly sprayed;
(4) The regenerated tail gas escaping from the top of the primary desulfurization regeneration tower is forcibly injected into the secondary desulfurization regeneration tower and is used for regenerating desulfurization liquid generated by secondary desulfurization; the secondary desulfurization regeneration tower is of a tower structure and comprises a lower desulfurization area and an upper regeneration area;
(5) The desulfurization solution extracted from the tower bottom (desulfurization area) of the secondary desulfurization regeneration tower is sent to the regeneration area at the upper part for oxidation regeneration and cyclic spraying;
(6) And the desulfurized and decyanated coal gas from the secondary desulfurization regeneration tower is sent to a subsequent ammonia absorption unit.
(7) And the regenerated tail gas from the regeneration area of the secondary desulfurization regeneration tower is returned to a coal gas main pipe behind the secondary desulfurization regeneration tower without being discharged.
As a further improvement of the technical scheme, in the step (3), the regenerated barren solution is collected by a bubble separator and then is pumped to the first-stage desulfurization regeneration tower.
As a further improvement of the technical scheme, the method also comprises the step that elemental sulfur generated by oxidation in the first-stage desulfurization regeneration tower floats to the top of the tower to form sulfur foam, and then flows into the buffer tank automatically.
And (3) as a further improvement of the technical scheme, the regenerated tail gas in the step (4) is forcibly injected into a secondary desulfurization regeneration tower, and the desulfurization solution generated by secondary desulfurization is regenerated under the action of an HPF catalyst.
Also as a further improvement of the technical scheme, the coal gas in the step (1) is the coal gas from middle-cooling naphthalene washing.
Furthermore, the tower of the first-stage HPF desulfurization tower is filled with HELIEX packing.
By adopting the technical scheme, the process method for improving the utilization rate of the oxygen in the residual air of the HPF desulfurization regeneration is used for cascade desulfurization of the regenerated tail gas of the primary desulfurization for the secondary desulfurization, can effectively control the oxygen concentration in the regenerated tail gas after the secondary desulfurization regeneration to be less than 13%, and then the regenerated tail gas is mixed into the coal gas, so that the use safety requirement that the oxygen content in the coal gas is less than or equal to 1% can be met, and the influence of the regenerated tail gas emission on the environment is fundamentally solved.
And because the secondary desulfurization does not use new air any more, the process method can reduce the running cost of the HPF desulfurization and decyanation process.
Drawings
FIG. 1 is a schematic diagram of the new process for increasing the oxygen utilization rate of the residual air in the desulfurization regeneration by HPF method according to the present invention;
in the figure: 1 is one-level desulfurizing tower import coal gas, 2 is one-level HPF desulfurizing tower, 3 is one-level desulfurizing tower export coal gas, 4 is one-level desulfurization regenerator tower export tail gas, 5 is one-level desulfurization regenerator tower, 6 is second grade desulfurization regenerator tower, 61 is the desulfurization region (of second grade desulfurization regenerator tower), 62 is the regeneration region (of second grade desulfurization regenerator tower), 7 is one-level desulfurization regeneration liquid circulating pump, 8 is second grade desulfurization regeneration liquid circulating pump, 9 is compressed air for regeneration, 10 is one-level desulfurization liquid circulating pump, 11 is the bubble separator.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Referring to fig. 1, the process method for improving the utilization rate of oxygen in the residual air generated by desulfurization and regeneration by the HPF method provided by the invention comprises the following steps:
the coal gas (inlet coal gas 1 of the first-stage desulfurizing tower in the figure) from middle-cold naphthalene washing enters a first-stage HPF desulfurizing tower 2, HELIEX filler is filled in the tower, the coal gas is in countercurrent contact with desulfurizing liquid sprayed from the top of the tower, and H in the coal gas 2 S, HCN is absorbed while NH is present 3 Is also partially absorbed.
The desulfurization solution at the bottom of the tower is sent to a first-stage desulfurization regeneration tower 5 through a first-stage desulfurization solution circulating pump 10, the desulfurization solution is oxidized and regenerated by compressed air (see compressed air for regeneration 9 in the figure) under the action of an HPF catalyst, the regenerated lean solution after regeneration is collected by a bubble separator 11, the regeneration solution is sent to the top of the first-stage HPF desulfurization tower 2 through a first-stage desulfurization regeneration solution circulating pump 7 to be circularly sprayed, elemental sulfur generated by oxidation in the first-stage desulfurization regeneration tower 5 floats to the top of the tower through air to form sulfur foam, and then the sulfur foam automatically flows into a buffer tank.
The gas (namely, the outlet gas 3 of the primary desulfurization tower in the figure) from the primary desulfurization tower 2 enters a secondary HPF-tower type desulfurization tower (namely, a 'tower type' secondary desulfurization regeneration tower 6 in the figure), and the 'tower type' secondary desulfurization regeneration tower 6 integrates desulfurization and regeneration in one tower relative to the split structure of the primary HPF desulfurization tower 2 and the primary desulfurization regeneration tower 5 and comprises a lower desulfurization area 61 and an upper regeneration area 62.
The desulfurization solution extracted from the bottom of the second desulfurization regeneration tower 6 is sent to a regeneration tower (i.e., a regeneration area 62) at the upper part of a tower-type desulfurization tower through a second desulfurization regeneration solution circulating pump 8 for oxidation regeneration, the regeneration tail gas at the top of the first desulfurization regeneration tower 5 (i.e., the outlet tail gas 4 of the first desulfurization regeneration tower in the figure) is forcibly sprayed into the second desulfurization regeneration tower (i.e., the regeneration area 62), and the second desulfurization solution is regenerated under the action of the HPF catalyst. The regenerated liquid (or called barren solution) automatically flows into a secondary desulfurization tower for circulating spraying, and H in the coal gas is further removed 2 S and HCN, and sulfur foam floating out of the upper part of the oxidation regeneration tank automatically flows to a buffer tank for primary desulfurization. And the coal gas which is discharged from the secondary desulfurizing tower and subjected to desulfurization and decyanation is sent to a subsequent ammonia absorption unit.
The regeneration air required by the primary desulfurization is sent out by a regeneration air compressor (refer to the compressed air for regeneration 9 in the figure), mixed with the desulfurization solution by a premixing nozzle at the bottom of the primary desulfurization regeneration tower 5 and then enters the tower, the regeneration tail gas escapes from the top of the primary desulfurization regeneration tower 5 and is forcibly sprayed and sucked into a secondary regeneration tower of the secondary desulfurization tower to regenerate the secondary desulfurization solution, and finally, the secondary desulfurization solution is returned into a coal gas system without being discharged; namely, the first-stage desulfurization regeneration tail gas is recycled by the first-tower second-stage desulfurization regeneration section and then is returned to the gas system without being discharged.
Namely, the novel process for improving the oxygen utilization rate of the HPF desulfurization regeneration air comprises the following important steps and characteristics:
(1) Air sent by the air compressor is sprayed into the first-stage desulfurization regeneration tower through a nozzle;
(2) The regeneration air is used for the oxidation regeneration of the primary desulfurization solution in a primary desulfurization regeneration tower under the action of an HPF catalyst;
(3) The regeneration tail gas from the top of the primary regeneration tower is introduced into the secondary desulfurization regeneration tower by a forced nozzle and is used for regenerating desulfurization solution generated by secondary desulfurization;
(4) The oxygen content in the regenerated tail gas after secondary utilization is less than 13 percent, and then the regenerated tail gas is returned to a gas system without being discharged;
(5) The secondary desulfurization regeneration tower is of a tower structure and comprises a lower desulfurization area and an upper regeneration area;
(6) The second-stage desulfurization uses the first-stage desulfurization to regenerate tail gas, and no new air is used.
The following are further specific examples.
Example 1:
the specific implementation mode of the novel process for improving the utilization rate of oxygen in the residual air generated by desulfurization regeneration by the HPF method is as follows:
1. the coal gas (coal gas 3 at the outlet of the first-stage desulfurizing tower) from the first-stage desulfurizing tower 2 enters a first-tower type second-stage desulfurizing regeneration tower 6;
2. the circulating desulfurization solution extracted from the bottom of the first-tower secondary desulfurization regeneration tower 6 is sent to a tower top secondary oxidation tower (namely, a regeneration area 62) for oxidation regeneration;
3. meanwhile, the air (namely the tail gas 4 at the outlet of the primary desulfurization regeneration tower) after primary regeneration from the top of the primary desulfurization regeneration tower 5 is forcibly injected and introduced into a secondary oxidation tower (namely a regeneration area 62) at the top of a first-tower-type secondary desulfurization regeneration tower 6, under the action of an HPF catalyst, the desulfurization solution generated by secondary desulfurization is oxidized and regenerated, the oxygen content in the regenerated tail gas from the secondary regeneration tower is below 13 percent, and the regenerated tail gas is returned to a coal gas system behind the secondary desulfurization regeneration tower and is not discharged outside.
4. The regenerated barren solution automatically flows into a lower secondary desulfurization tower from an oxidation regeneration groove at the top of a first tower type secondary desulfurization regeneration tower 6, and further flows into a lower secondary desulfurization towerAbsorbing H in coal gas 2 S and HCN;
5. the sulfur foam floating out of the upper part of the oxidation regeneration tank at the top of the first-tower type second-stage desulfurization regeneration tower 6 automatically flows into a buffer tank for first-stage desulfurization;
6. the desulfurized and decyanated coal gas from the lower desulfurizing tower (namely the desulfurizing area 61) of the one-tower type two-stage desulfurizing and regenerating tower 6 is sent to a subsequent ammonia absorption unit.
Through the specific implementation of the novel process, the regenerated tail gas of the primary desulfurization is cascaded for the secondary desulfurization, the oxygen concentration in the regenerated tail gas after the secondary desulfurization regeneration can be controlled to be less than 13%, the regenerated tail gas is returned into the coal gas, the use safety requirement that the oxygen content in the coal gas is less than or equal to 1% is met, and the influence of the regenerated tail gas emission on the environment is fundamentally solved. Because the secondary desulfurization does not use new air, the operation cost of the HPF desulfurization and decyanation process can be reduced.
Claims (6)
1. A process method for improving the utilization rate of oxygen in residual air generated by desulfurization and regeneration of an HPF method is characterized by comprising the following steps:
(1) The coal gas enters a primary HPF desulfurization tower through the bottom part of the primary HPF desulfurization tower, and desulfurization liquid is sprayed on the top of the tower;
(2) Sending the desulfurization solution collected at the bottom of the primary HPF desulfurization tower to a primary desulfurization regeneration tower, and carrying out oxidation regeneration on the desulfurization solution by compressed air sent into the tower under the action of an HPF catalyst;
(3) Collecting the regenerated barren solution, and pumping the barren solution to the top of the primary desulfurizing tower for circular spraying;
(4) The regenerated tail gas escaping from the top of the primary desulfurization regeneration tower is forcibly injected into the secondary desulfurization regeneration tower and is used for regenerating desulfurization liquid generated by secondary desulfurization; the secondary desulfurization regeneration tower is of a tower structure and comprises a lower desulfurization area and an upper regeneration area;
(5) The desulfurization solution extracted from the desulfurization area at the bottom of the secondary desulfurization regeneration tower is sent to the regeneration area at the upper part for oxidation regeneration and cyclic spraying;
(6) The coal gas which is discharged from the secondary desulfurization regeneration tower and subjected to desulfurization and decyanation is sent to a subsequent ammonia absorption unit;
(7) And the regenerated tail gas from the regeneration area of the secondary desulfurization regeneration tower is returned to a coal gas main pipe behind the secondary desulfurization regeneration tower without being discharged.
2. The process for improving the oxygen utilization rate of the residual air from the desulfurization and regeneration by the HPF method according to claim 1, wherein in the step (3), the regenerated barren solution is collected by a bubble separator and then is pumped to the primary desulfurization and regeneration tower.
3. The process method for improving the utilization rate of oxygen in the residual air after desulfurization and regeneration by the HPF method according to claim 1, further comprising the step of floating elemental sulfur generated by oxidation in the primary desulfurization and regeneration tower to the top of the tower to form sulfur foam, and then feeding the sulfur foam into a buffer tank by self-flow.
4. The process method for improving the oxygen utilization rate of the residual air from the desulfurization and regeneration by the HPF method according to claim 1, wherein the regeneration tail gas in the step (4) is forcibly injected into a secondary desulfurization regeneration tower, and the desulfurization solution generated by the secondary desulfurization is regenerated under the action of an HPF catalyst.
5. The process method for improving the oxygen utilization rate of the residual air from the desulfurization and regeneration by the HPF method according to claim 1, wherein the coal gas in the step (1) is the coal gas from middle-cooling naphthalene washing.
6. The process method for improving the oxygen utilization rate of the residual air generated by the desulfurization and regeneration of the HPF method in the claim 1, wherein a HELIEX filler is filled in the tower of the primary HPF desulfurization tower.
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| CN111088083A (en) * | 2020-01-20 | 2020-05-01 | 中冶焦耐(大连)工程技术有限公司 | System and process for reducing desulfurization regeneration tail gas emission |
| CN211771109U (en) * | 2020-01-20 | 2020-10-27 | 中冶焦耐(大连)工程技术有限公司 | System for reducing desulfurization regeneration tail gas emission |
| CN212476648U (en) * | 2020-05-27 | 2021-02-05 | 宁波中科远东催化工程技术有限公司 | Desulfurization regeneration tower |
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