CN107837681A - After catalytic cracked regenerated exhuast gas desulfurization in gas desulfurizing agent recovery system and method - Google Patents
After catalytic cracked regenerated exhuast gas desulfurization in gas desulfurizing agent recovery system and method Download PDFInfo
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- CN107837681A CN107837681A CN201711191728.7A CN201711191728A CN107837681A CN 107837681 A CN107837681 A CN 107837681A CN 201711191728 A CN201711191728 A CN 201711191728A CN 107837681 A CN107837681 A CN 107837681A
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- Prior art keywords
- gas
- heat exchanger
- desulfurizing agent
- clarifier
- mechanically decoupled
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- 230000003009 desulfurizing effect Effects 0.000 title claims abstract description 110
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 51
- 230000023556 desulfurization Effects 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000003197 catalytic effect Effects 0.000 title claims abstract description 31
- 238000011084 recovery Methods 0.000 title claims abstract description 22
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 73
- 238000010438 heat treatment Methods 0.000 claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000007789 gas Substances 0.000 claims description 155
- 239000000463 material Substances 0.000 claims description 28
- 239000002245 particle Substances 0.000 claims description 25
- 210000003298 dental enamel Anatomy 0.000 claims description 22
- 239000002912 waste gas Substances 0.000 claims description 20
- 239000000112 cooling gas Substances 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 17
- 238000000746 purification Methods 0.000 claims description 14
- 239000002002 slurry Substances 0.000 claims description 14
- 239000007787 solid Substances 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 13
- 239000000706 filtrate Substances 0.000 claims description 10
- 229910001220 stainless steel Inorganic materials 0.000 claims description 10
- 239000010935 stainless steel Substances 0.000 claims description 10
- 238000009833 condensation Methods 0.000 claims description 9
- 230000005494 condensation Effects 0.000 claims description 9
- 239000005864 Sulphur Substances 0.000 claims description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 7
- 229910000963 austenitic stainless steel Inorganic materials 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 6
- 229910010293 ceramic material Inorganic materials 0.000 claims description 6
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims description 6
- 239000011733 molybdenum Substances 0.000 claims description 6
- 239000010936 titanium Substances 0.000 claims description 6
- 229910052719 titanium Inorganic materials 0.000 claims description 6
- 239000000956 alloy Substances 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims 1
- 239000010931 gold Substances 0.000 claims 1
- 229910052737 gold Inorganic materials 0.000 claims 1
- 239000003054 catalyst Substances 0.000 abstract description 30
- 239000008187 granular material Substances 0.000 abstract description 14
- 238000003912 environmental pollution Methods 0.000 abstract description 7
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 23
- 230000003628 erosive effect Effects 0.000 description 12
- 238000005260 corrosion Methods 0.000 description 11
- 230000007797 corrosion Effects 0.000 description 11
- 238000012545 processing Methods 0.000 description 11
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 10
- 239000003513 alkali Substances 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 10
- 229920006395 saturated elastomer Polymers 0.000 description 10
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 8
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 7
- 238000001914 filtration Methods 0.000 description 7
- 239000011734 sodium Substances 0.000 description 7
- 229910052708 sodium Inorganic materials 0.000 description 7
- 238000005299 abrasion Methods 0.000 description 6
- 238000004523 catalytic cracking Methods 0.000 description 6
- 229910001069 Ti alloy Inorganic materials 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 4
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 4
- 235000011941 Tilia x europaea Nutrition 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 239000004571 lime Substances 0.000 description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical group O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 241000370738 Chlorion Species 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 239000002826 coolant Substances 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 3
- 238000011069 regeneration method Methods 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 239000012065 filter cake Substances 0.000 description 2
- 229910000856 hastalloy Inorganic materials 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- -1 by filtering Substances 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 235000009508 confectionery Nutrition 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 235000003642 hunger Nutrition 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Analytical Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Treating Waste Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The present invention relates to the recovery system and method for desulfurizing agent in gas after catalytic cracked regenerated exhuast gas desulfurization, recovery system, including desulfurizing tower, condensing heat exchanger, mechanically decoupled clarifier, heating heat exchanger and filter, the gas outlet of desulfurizing tower is connected by the first pipeline with the air inlet of mechanically decoupled clarifier, and condensing heat exchanger is arranged in the first pipeline；Heating heat exchanger is arranged in the gas exhaust piping of mechanically decoupled clarifier；Condensing heat exchanger and mechanically decoupled clarifier are connected by the second pipeline with filter respectively.The present invention can effectively reduce the dew point of desulfurizing tower exit gas, the water vapour content in exit gas and the desulfurizing agent and catalyst granules concentration of entrainment are reduced, recyclable most of desulfurizing agent, reduces desulfurizing agent emission loss, operating cost is reduced, while reduces environmental pollution；By setting heating heat exchanger, it can prevent discharge gas from entering temperature and can still be condensed out drop at once less than gas temperature environment, avoid the formation of white haze.
Description
Technical field
The present invention relates to environment-protective process technical field, and in particular to is taken off after a kind of catalytic cracked regenerated exhuast gas desulfurization in gas
The recovery system and method for sulphur agent.
Background technology
Catalytic cracking is the important process process in oil refining production.The catalyst of catalytic cracking needs periodically to carry out again
Raw, waste gas caused by regenerative process contains the pollutants such as sulfur dioxide, it is necessary to could be discharged after being purified by sulfur removal technology.
Desulfurization typically uses wet desulfurizing process, and desulfurizing agent is alkali lye, and desulfurizing agent contacts with gas, and sulfur dioxide reacts, and removes
The sulfur dioxide gone in gas.Alkali lye can be lime, sodium hydroxide or sodium carbonate, ammonia etc., and corresponding sulfur removal technology is distinguished
Referred to as calcium method, sodium alkali, ammonia desulfurizing process.In gas after desulfurization in addition to containing saturated steam, the desulfurization also carried secretly
Agent, the catalyst granules of residual.It is the vapor of entrainment, catalyst granules, de- because catalytic cracked regenerated caused exhausted air quantity is big
The total amounts such as sulphur agent are larger, if environmental pollution can be caused by not handling.The desulfurizing agent of entrainment can also cause to take off in addition to polluting
Sulphur agent is lost, it has to is additionally supplemented desulfurizing agent, is increased operating cost.
The main component of catalytic cracking catalyst is aluminum oxide and silicate, and the main component is not soluble in water, and granularity is small, grain
Footpath typically at 40~80 μm, is easily carried secretly by gas, and hardness is big, has obvious erosion to act on to equipment wall.This is that catalysis is split
The significant difference of gas and gas after other exhuast gas desulfurizations after change regeneration off gases desulfurization.Therefore need to consider high rigidity catalyst particles
The erosion effect of grain, special transformation or design are carried out to equipment.
Passed through in sulfur removal technology frequently with flue gas-smoke re-heater (GGH) technology.Be into desulfurizing tower hot waste gas and go out desulfurization
The purified gas of tower carries out gas-gas heat exchange, is cooled using rotary regenerative heat exchange mode to entering desulfurizing tower hot waste gas, goes out desulfurization
Tower purified gas heat temperature raising.By this technology, the gas temperature of desulfurizing tower is lowered into, improves absorption efficiency, while improve out
The gas temperature of desulfurizing tower, eliminate drop and produce, to reduce the corrosion to follow-up equipment.But the technology is due to heat smoke
The solid dust of middle carrying is easily deposited in heat storage, is resulted in blockage and operation problem；And heating desulfurizing tower exit gas,
Gas dew point can not be effectively reduced, the vapor and desulfurizing agent of the entrainment of one side gas still can largely lose, and be passed through air
After pollute, it is still larger that another aspect gas condenses probability in temperature is compared with low environment, and easily corrosion and deposition block pipeline
And equipment.
The content of the invention
The technical problems to be solved by the invention are to be directed to problem of the prior art, there is provided a kind of catalytic cracked regenerated waste gas
After desulfurization in gas desulfurizing agent recovery system and method.
The technical scheme that the present invention solves above-mentioned technical problem is as follows：Desulfurization in gas after catalytic cracked regenerated exhuast gas desulfurization
The recovery system of agent, including desulfurizing tower, condensing heat exchanger, mechanically decoupled clarifier, heating heat exchanger and filter, the desulfurization
The gas outlet of tower is connected by the first pipeline with the air inlet of the mechanically decoupled clarifier, and the condensing heat exchanger is arranged on
In first pipeline；The heating heat exchanger is arranged in the gas exhaust piping of the mechanically decoupled clarifier；The condensation is changed
Hot device and mechanically decoupled clarifier are connected by the second pipeline with the filter respectively.
The beneficial effects of the invention are as follows：The present invention can effectively reduce desulfurizing tower exit gas by setting condensing heat exchanger
Dew point, reduce exit gas in water vapour content and entrainment desulfurizing agent and catalyst granules concentration, recyclable major part
Desulfurizing agent, desulfurizing agent emission loss is reduced, reduces operating cost, while reduce environmental pollution；By setting heating heat exchange
Device, it can prevent discharge gas from entering temperature and can still be condensed out drop at once less than gas temperature environment, avoid the formation of white haze.
On the basis of above-mentioned technical proposal, the present invention can also do following improvement.
Further, the condensing heat exchanger is plate type heat exchanger or finned heat exchanger or tubular heat exchanger.
Further, the material of the condensing heat exchanger is austenitic stainless steel or two phase stainless steel or high silicon iron containing molybdenum or Kazakhstan
Formula alloy or titanium alloy or titanium.
Further, inlayed on the windward side of the condensing heat exchanger or covered with enamel piece or potsherd.
It is using the above-mentioned further beneficial effect of scheme：Because the windward side of condensing heat exchanger front end contacts with gas,
Because condensate is few, moisture film is not yet formed, erosion effect of the catalyst particles in gas to equipment surface is obvious, using enamel
Piece or potsherd are inlayed or are covered at the air inlet windward side of condensing heat exchanger, can effectively reduce abrasion and corrosion.
Further, the mechanically decoupled clarifier is sieve plate or screen or louvered baffle plate.
It is using the above-mentioned further beneficial effect of scheme：Using sieve plate, screen or baffle plate, the liquid carried secretly in gas and
Granule impact is fixed to the silk screen, screen or baffle plate of sieve plate, after being polymerized to bulky grain or drop, due to the flowing of drop, is collected
To after the container of lower section, can periodically discharge.
Further, the material of the mechanically decoupled clarifier is enamel or ceramic material.
It is using the above-mentioned further beneficial effect of scheme：Using mechanically decoupled purification made of enamel or ceramic material
Device, erosive wear of the catalyst granules that can effectively avoid carrying in gas to mechanically decoupled clarifier.
A kind of method using desulfurizing agent in gas after the above-mentioned catalytic cracked regenerated exhuast gas desulfurization of recovery system recovery, bag
Include following steps：
S1, catalytic cracked regenerated waste gas are entered in the desulfurizing tower after progress desulfurization process, the processed gas row of generation
Go out into the condensing heat exchanger；
S2, the processed gas are cooled in the condensing heat exchanger, and condensation contains water and desulfurizing agent
Mixed liquor A, obtain the gas that cools；
S3, the cooling gas is discharged into the mechanically decoupled clarifier, isolated mixed in the cooling gas
Liquid B is closed, is purified gas；
S4, the slurry obtained after the mixed liquor A and mixed liquid B are mixed are all discharged into the filter, cross and filter out
Solid particle therein is removed, and after the desulphurizer mixing that the filtrate containing desulfurizing agent is back in the desulfurizing tower and newly added
Recycling；
S5, the purification gas is discharged into after carrying out heat temperature raising in the heating heat exchanger and discharged.
The beneficial effects of the invention are as follows：The method of present invention recovery desulfurizing agent, the gas that can be discharged to desulfurizing tower drop
Temperature processing, the saturated vapour pressure of gas reduces after cooling, and one side saturated steam condenses, and reduces the dew point of gas；Separately
On the one hand, the desulfurizing agent and catalyst granules that the water of condensation is formed in moisture film absorption adhesion gas, recyclable useful desulfurizing agent；
Slurry carried out using filter to be filtered to remove solid particle therein, and the filtrate containing desulfurizing agent is returned in desulfurizing tower
With being re-used after the desulphurizer mixing that newly adds, the dosage of desulfurizing agent can be effectively reduced, also less desulfurizing agent discharge causes
Problem of environmental pollution.
Further, for the processed gas after cooling, its temperature reduces at least 3 DEG C.
Further, for the purification gas after heat temperature raising, its temperature increases at least 5 DEG C.
Brief description of the drawings
Fig. 1 is the process flow diagram of recovery system of the present invention.
In accompanying drawing, the list of parts representated by each label is as follows：
1st, desulfurizing tower；11st, the first pipeline；2nd, condensing heat exchanger；3rd, mechanically decoupled clarifier；31st, gas exhaust piping；4th, heat
Heat exchanger；5th, filter；51st, the second pipeline.
Embodiment
The principle and feature of the present invention are described below in conjunction with accompanying drawing, the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the present invention.
As shown in figure 1, after the catalytic cracked regenerated exhuast gas desulfurization of the present invention in gas desulfurizing agent recovery system, it is including de-
Sulphur tower 1, condensing heat exchanger 2, mechanically decoupled clarifier 3, heating heat exchanger 4 and filter 5, the gas outlet of the desulfurizing tower 1 lead to
The air inlet that the first pipeline 11 is crossed with the mechanically decoupled clarifier 3 is connected, and the condensing heat exchanger 2 is arranged on described first
In pipeline 11；The heating heat exchanger 4 is arranged in the gas exhaust piping 31 of the mechanically decoupled clarifier 3；The condensing heat-exchange
Device 2 and mechanically decoupled clarifier 3 are connected by the second pipeline 51 with the filter 5 respectively.
The condensing heat exchanger 2 of the present invention is plate type heat exchanger or finned heat exchanger or tubular heat exchanger.
The material of the condensing heat exchanger 2 of the present invention for austenitic stainless steel or two phase stainless steel or high silicon iron containing molybdenum or
Kazakhstan formula alloy or titanium alloy or titanium.
The material of the mechanically decoupled clarifier 3 of the present invention is enamel or ceramic material.Using enamel or ceramic material
Manufactured mechanically decoupled clarifier, erosion mill of the catalyst granules that can effectively avoid carrying in gas to mechanically decoupled clarifier
Damage.
Inlay on the windward side of the condensing heat exchanger 2 of the present invention or covered with enamel piece or potsherd, that is, condensing
One layer of ceramics or enamel structure are set on the windward side of the air inlet of heat exchanger.For example, enamel piece or potsherd are set complete
Structure, it can be directly sleeved on the windward side of condensing heat exchanger.Because the windward side of condensing heat exchanger front end contacts with gas, due to
Condensate is few, not yet forms moisture film, and erosion effect of the catalyst particles in gas to equipment surface is obvious, using enamel piece or
Potsherd is inlayed or is covered at the air inlet windward side of condensing heat exchanger, can effectively reduce abrasion and corrosion.
The mechanically decoupled clarifier 3 of the present invention is sieve plate or screen or louvered baffle plate.Using sieve plate, screen or gear
Plate, the liquid carried secretly in gas and fixed granule impact are polymerized to bulky grain or drop on the silk screen, screen or baffle plate of sieve plate
Afterwards, due to the flowing of drop, after being pooled to the container of lower section, can periodically discharge.
A kind of side that desulfurizing agent in gas after catalytic cracked regenerated exhuast gas desulfurization is reclaimed using above-mentioned recovery system of the present invention
Method, comprise the following steps：
S1, catalytic cracked regenerated waste gas are entered in the desulfurizing tower after progress desulfurization process, the processed gas row of generation
Go out into the condensing heat exchanger；
S2, the processed gas are cooled in the condensing heat exchanger, and condensation contains water and desulfurizing agent
Mixed liquor A, obtain the gas that cools；The temperature of the cooling is 3-40 DEG C；
S3, the cooling gas is discharged into the mechanically decoupled clarifier, isolated mixed in the cooling gas
Liquid B is closed, is purified gas；
S4, the slurry obtained after the mixed liquor A and mixed liquid B are mixed are all discharged into the filter, cross and filter out
Solid particle therein is removed, and after the desulphurizer mixing that the filtrate containing desulfurizing agent is back in the desulfurizing tower and newly added
Recycling；
S5, the purification gas is discharged into after carrying out heat temperature raising in the heating heat exchanger and discharged；The heating rises
The temperature of temperature is 5-50 DEG C.
Because catalytic cracking process is important refining process, catalytic cracking catalyst needs frequent regeneration, regeneration
Contain carbon dioxide, sulfur dioxide and nitrogen oxide and catalyst particles in caused waste gas, waste gas is by denitration, desulfurizing and purifying
It could be discharged after technique, desulfurization uses the technique that alkali lye neutralizes；Calcium hydroxide is typically used suitable for catalytic cracked regenerated waste gas
(calcium method), sodium hydroxide or sodium carbonate (sodium alkali), ammoniacal liquor (ammonia process) carry out desulfurization.Desulfurizing tower is generally spray column, desulfurizing agent
Contacted by rear under tower top spray with back flow of gas, neutralization reaction generation sulphite occurs for sulfur dioxide and desulfurizing agent, by absorbing
After processing, gas is discharged from top.The catalyst that the gas flowing of atm number can carry alkali lye, saturated steam and residual secretly is micro-
Grain, although have passed through the processing such as demister of desulfurization column overhead, because tolerance is very big and gas contains saturated steam, gas folder
Band drains a large amount of water and desulfurizing agent.When desulfurizing agent uses sodium hydroxide, unreacted desulfurizing agent can recycle, due to hydrogen-oxygen
A small amount of chlorion can be contained by changing in sodium, caused chlorion to add up, therefore, can be entrained with containing chlorine in desulfurizing tower top discharge gas
The drop of ion.Chloride ion corrosion is big in drop, obvious to carbon steel, austenite stainless steel corrosion, using sodium hydroxide as
During vulcanizing agent, condensing heat exchanger needs the material using anti-chlorine ion corrosion with gas contact portion, such as can select to contain molybdenum
High silicon iron, two phase stainless steel, breathe out formula alloy, titanium alloy and titanium etc..Because catalytic cracked regenerated tail gas is in desulfurizing tower desulfurization heel row
The gas gone out carries substantial amounts of vapor and desulfurizing agent, causes desulfurizing agent loss and environmental pollution.
The gas of desulfurizing tower discharge carries out cooling processing, condensing heat exchanger by the condensing heat exchanger set in pipeline first
For plate type heat exchanger or plate-fin heat exchanger or tubular heat exchanger.Cooling medium is cooling water.The sweet gas of desulfurizing tower discharge
The temperature of body is generally 50-80 DEG C, 3 DEG C less is down to after condensing heat exchanger cools down, at a temperature of processed gas, preferably 5
More than DEG C.Due to containing saturated steam, water vapor condensation after cooling, the sodium hydroxide of entrainment in the processed gas of desulfurizing tower discharge
Also settle and be dissolved in condensate liquid therewith Deng desulfurizing agent.Condensation generation drop particulate is smaller, if without processing, it is easy to
Carried secretly by gas, be discharged into air.Therefore, it is necessary to by mechanically decoupled net after condensing heat exchanger carries out cooling processing to gas
Change device to be handled.Mechanically decoupled clarifier is gas-solid separator or gas-liquid separator, for separate the liquid in gas and
Solid constituent.The form of mechanically decoupled clarifier is sieve plate or screen or baffle-type.Liquid and solid particle impact exist
On the silk screen of sieve plate or the grid of screen or baffle plate, coalescence, due to droplet flow, is collected into after bulky grain or drop
After the container of lower section, periodically discharge.Because carrying catalyst granules in gas, hardness is big, quick abrasion.Mechanically decoupled clarifier
It is made of enamel or ceramic material, it is possible to reduce the erosive wear of catalyst particles.
Wherein, the arrangement of sieve plate, screen and louvered baffle plate is respectively：Sieve plate is porous plate, and the shape in hole can be with
It is arranged as required to as arbitrary shape, such as can is slotted hole, delthyrium, circular hole, square hole etc.；Screen is by multiple screen bar phases
Mutually interweave the network structure being fixedly connected to form；Louvered baffle plate includes the louver of fix bar and some parallel arrangements, will be some
Louver is all vertically fixed in fix bar, and some louvers are all in tilted layout and are all parallel to each other, when containing drop and fixed
When the gas of grain is impacted on louver, fixed particle and drop are retained by louver, and are flowed in filter and carried out along louver
Filter.
Because the windward side of condensing heat exchanger front end contacts with gas, because condensate is few, moisture film is not yet formed, in gas
Erosion effect of the catalyst particles to equipment surface it is obvious, inlayed using enamel piece or potsherd or be covered in condensing heat exchanger
Air inlet windward side at, can effectively reduce abrasion and corrosion.The catalyst granules of catalytic cracking is very tiny, and general granularity exists
Between 40-80 μm, easily carried secretly by gas.The main component of catalyst is aluminum oxide and silicate, and hardness is high, to the mill of equipment
Damage corrosion is larger, and the impact being subject to for the heat exchanger fin of the heat exchanger windward side relative with air-flow is more, and abrasion is maximum.Therefore, exist
Either covering ceramics or enamel shielding plate are inlayed in heat exchanger fin windward side, can reduce the abrasion of this part, improve the use of equipment
Life-span.
Gas is purified after condensed heat exchanger cooling, the processing of mechanically decoupled purification utensil, although purification gas is warm
Degree is reduced, and solid particle therein has been removed, but wherein still contains saturated steam, is less than gas temperature into temperature
Environment can still be condensed out drop at once, form white haze.Therefore need to carry out heating treatment to purification gas, make containing insatiable hunger
With the gas of vapor, such a gas contacts with low temperature environment, will not be condensed out drop at once, but pass through one section of temperature-fall period
Dew-point temperature can be just reduced to afterwards, and due to diffusion, water vapour content has been reduced so as to which dew point reduces in gas, is formed white
The probability of mist greatly reduces, and it is less to form white haze.Gas heating is more, and white haze generation probability is smaller.But heating consumption heat energy,
Running cost raises, therefore increasing extent of temperature is unsuitable excessive.Warming temperature is not less than 3 DEG C, preferably not less than 5 DEG C.
Gas after cooling, isolation of purified, heating treatment, it can discharge.And condensed out by condensation purifier
Liquid, by filtering, liquid contains soluble desulfurizing agent, can return to desulfurizing tower with making again after fresh desulphurizer mixing
With, and the desulfurizing agent that filter cake is mainly catalyst particles not soluble in water and a small amount of crystallization separates out, it can return to other techniques and carry out
Recycling, or as fixed-end forces.
In the conventional flow that the boiler of catalytic cracked regenerated waste gas is handled, waste gas is before desulfurizing tower is entered through flue gas heat exchange
Device (GGH) cools, and is discharged again after flue gas heat-exchange unit (GGH) is warming up to 70~80 DEG C after demister removes water after desulfurization.Row
Due to not cooling before putting, actual water vapour content is constant, and demister can only remove the liquid of the drop being in a liquid state, i.e. gas entrainment
Drop, saturated steam can not remove, and can only also remove the desulfurizing agent and catalyst particles in particulate carried on a small quantity.It is existing
The GGH technologies used by boiler waste gas desulfurizing tower gas treatment, operating cost is higher, and easily blocks, and discharge gas is still
It can produce " white haze " caused by droplets agglomerate and desulfurizing agent, and easily liquid is condensed into chimney etc., cause equipment and materials rotten
Erosion.Such a technique is only capable of eliminating " white haze " in discharge gas, but can not reclaim desulfurizing agent therein, and easily blocks, be rotten
Erosion.And the technology used using the present invention, desulfurizing agent can be not only reclaimed, reduces exhaust emission, reduces operating cost；Recovery
Desulfurizing agent can return to desulfurizing tower with being reused after fresh desulphurizer mixing, and filter cake is mainly that catalyst not soluble in water is micro-
The desulfurizing agent that grain and a small amount of crystallization separate out, can return to other techniques and is recycled, or as fixed-end forces.
The present invention carries out cooling processing using condensing heat exchanger to the processed gas that desulfurizing tower is discharged, and obtains the gas that cools,
The saturated vapor pressure of cooling gas reduces, and one side saturated steam condenses, and reduces the dew point of gas, on the other hand, coagulates
The water formation moisture film of knot can adsorb and absorb desulfurizing agent and catalyst granules in gas, reclaim useful desulfurizing agent.Due to de-
Sulphur agent is water-soluble alkaline matter, and catalyst granules is aluminum oxide not soluble in water, silicate etc., be mixed with desulfurizing agent,
The lime set of catalyst particles, can remove catalyst particles therein by modes such as filterings, and the filtrate of acquisition is to contain desulfurization
The aqueous solution of agent.This aqueous solution can be back to desulfurizing tower and reuse, and so as to reduce doctor solution consumption, decrease desulfurization
Problem of environmental pollution caused by agent discharge.
Further, since discharge gas caused by the desulfurization discharge gas of catalytic cracked regenerated waste gas and boiler flue gas desulfurization is not
Together.Contain catalyst particles in the desulfurization discharge gas of catalytic cracked regenerated waste gas, main component is aluminum oxide and silicate, firmly
Degree is big, pipeline erosion is acted on obvious.And and particle less containing the big inorganic matter component of hardness is larger easily in boiler smoke
Removed in wet desulfurizing process, therefore relative to Gas-treating processes after other desulfurization, after catalytic cracked regenerated tail gas desulfurization
Gas needs the erosion effect for taking technology to reduce or eliminate particulate for catalyst particles.During using sodium alkali desulfurization, desulfurization
Contain chlorine in agent, chlorion is contained in lime set, corrosivity is strong, requires high to the material of separation and cleaning equipment.
For heating heat exchanger of the present invention because no lime set produces, corrosion is smaller, and the corrosion resistance requirement to material is relatively
It is low, austenitic stainless steel can be used, either two phase stainless steel or high silicon iron containing molybdenum, either Hastelloy or titanium alloy,
Or titanium.Because both rear prices are high, this two kinds of materials are not used preferably, equipment cost is reduced to reduce investment outlay.Heating heat exchange
Device can also use enamel material.Heating heat exchanger can use steam, conduction oil also may be used as heating medium, heating heat exchanger
To be combined with the cooling heat exchanger of desulfurizing tower entrance, heat is taken by the latter, for the former heating, is situated between using water or other heat transfers
Matter, such as conduction oil, ethylene glycol.
The cooling medium of condensing heat exchanger of the present invention can be recirculated cooling water, chilled water or cool brine.Cooling medium
Temperature should not be higher than 40 DEG C, preferably not higher than 30 DEG C.
The present invention can effectively reduce the dew point of desulfurizing tower exit gas by setting condensing heat exchanger, reduce exit gas
In water vapour content and entrainment desulfurizing agent and catalyst granules concentration, recyclable most of desulfurizing agent, reduce desulfurizing agent row
Loss is put, reduces operating cost, while reduce environmental pollution；By setting heating heat exchanger, it can prevent discharge gas from entering
Drop can be still condensed out at once less than gas temperature environment by entering temperature, avoid the formation of white haze.
Embodiment 1
30000m3The catalytic cracked regenerated waste gas of/h, using sodium alkali after desulfurizing tower carries out processing desulfurization, what is obtained is de-
Sulphur gas temperature is 50~55 DEG C, and condensed heat exchanger cools down 3 DEG C, obtains the cooling gas that temperature is 47~52 DEG C.Will cooling
Drop in the gas that cools and solid particle are separated, are purified by the mechanically decoupled clarifier of screen mesh type by gas
Gas；Condensed water caused by the slurries and condensing heat exchanger isolated in cooling gas forms slurries together, and containing after filtering is de-
Sulphur agent filtrate returns to desulfurizing tower and is continuing with.Purification gas finally enters heating heat exchanger and heated, and is discharged after 5 DEG C of heating.
Condensing heat exchanger uses plate-fin heat exchanger made of titanium alloy material, and there is enamel piece plate-fin heat exchanger windward side.Screen mesh type
Separator material is enamel.Heating heat exchanger material is austenitic stainless steel.
Embodiment 2
50000m3The catalytic cracked regenerated waste gas of/h, using calcium method after desulfurizing tower carries out processing desulfurization, obtained desulfurization
Gas temperature is 50~55 DEG C, and condensed heat exchanger cools down 20 DEG C, obtains the cooling gas that temperature is 30~35 DEG C.By the gas that cools
Drop in the gas that cools and solid particle are separated by the mechanically decoupled clarifier of screen mesh type, are purified gas by body
Body；Condensed water caused by the slurries and condensing heat exchanger isolated in cooling gas forms slurries together, contains desulfurization after filtering
Agent filtrate returns to desulfurizing tower and is continuing with.Purification gas finally enters heating heat exchanger and heated, and is discharged after 40 DEG C of heating.It is cold
Solidifying heat exchanger uses plate-fin heat exchanger made of two-phase stainless steel material, and there is potsherd plate-fin heat exchanger windward side.Screen cloth
Formula separator material is enamel.Heating heat exchanger material is austenitic stainless steel.
Embodiment 3
50000m3The catalytic cracked regenerated waste gas of/h, using ammonia process after desulfurizing tower carries out desulfurization process, obtained desulfurization
Gas temperature is 70~80 DEG C, and condensed heat exchanger cools down 40 DEG C, obtains the cooling gas that temperature is 30~40 DEG C.By the gas that cools
Drop in the gas that cools and solid particle are separated by the mechanically decoupled clarifier of grid type, are purified gas by body
Body；Condensed water caused by the slurries and condensing heat exchanger isolated in cooling gas forms slurries together, contains desulfurization after filtering
Agent filtrate returns to desulfurizing tower and is continuing with.Purification gas finally enters heating heat exchanger and heated, and is discharged after 45 DEG C of heating.It is cold
Solidifying heat exchanger uses plate type heat exchanger made of austenite stainless steel material, and there is enamel piece plate type heat exchanger windward side.Grid type
Separator material is enamel.Heating heat exchanger material is austenitic stainless steel.
Embodiment 4
100000m3The catalytic cracked regenerated waste gas of/h, using sodium alkali after desulfurizing tower carries out processing desulfurization, obtains temperature
The cooling gas for 55~65 DEG C is spent, condensed heat exchanger cools down 15 DEG C, obtains the cooling gas that temperature is 40~50 DEG C.Will drop
Drop in the gas that cools and solid particle are separated, obtained net by the mechanically decoupled clarifier of baffle-type by wet body
Change gas；Condensed water caused by the slurries and condensing heat exchanger isolated in cooling gas forms slurries together, containing after filtering
Desulfurizing agent filtrate returns to desulfurizing tower and is continuing with.Purification gas finally enters heating heat exchanger and heated, and heat up 20 DEG C of heel row
Put.Condensing heat exchanger uses tubular heat exchanger made of Hastelloy material, and there is potsherd tubular heat exchanger windward side.Gear
Plate separator material is ceramics.Heating heat exchanger material is two phase stainless steel.
Embodiment 5
100000m3The catalytic cracked regenerated waste gas of/h, using sodium alkali after desulfurizing tower carries out desulfurization process, obtain
Processed gas temperature is 50~55 DEG C, and condensed heat exchanger cools down 4 DEG C, obtains the cooling gas that temperature is 46~51 DEG C.Will drop
Drop in the gas that cools and solid particle are separated, obtained net by the mechanically decoupled clarifier of baffle-type by wet body
Change gas；Condensed water caused by the slurries and condensing heat exchanger isolated in cooling gas forms slurries together, containing after filtering
Desulfurizing agent filtrate returns to desulfurizing tower and is continuing with.Purification gas finally enters heating heat exchanger and heated, and heat up 50 DEG C of heel row
Put.Condensing heat exchanger has enamel piece using tubular heat exchanger, tubular heat exchanger windward side made of the material of high silicon iron containing molybdenum.
Baffle separator material is ceramics.Heating heat exchanger material is two phase stainless steel.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " up time
The orientation or position relationship of the instruction such as pin ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " be based on orientation shown in the drawings or
Position relationship, it is for only for ease of and describes the present invention and simplify description, rather than indicates or imply that signified device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally；Can be that machinery connects
Connect or electrically connect；Can be joined directly together, can also be indirectly connected by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements, limited unless otherwise clear and definite.For one of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature can be with "above" or "below" second feature
It is that the first and second features directly contact, or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature are directly over second feature or oblique upper, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward, or is merely representative of fisrt feature level height and is less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment or example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.Moreover, specific features, structure, material or the feature of description can be with office
Combined in an appropriate manner in one or more embodiments or example.In addition, in the case of not conflicting, the skill of this area
Art personnel can be tied the different embodiments or example and the feature of different embodiments or example described in this specification
Close and combine.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changed, replacing and modification.
Claims (9)
1. after catalytic cracked regenerated exhuast gas desulfurization in gas desulfurizing agent recovery system, it is characterised in that including desulfurizing tower, condensation
Heat exchanger, mechanically decoupled clarifier, heating heat exchanger and filter, the gas outlet of the desulfurizing tower by the first pipeline with it is described
The air inlet of mechanically decoupled clarifier is connected, and the condensing heat exchanger is arranged in first pipeline；The heating heat exchange
Device is arranged in the gas exhaust piping of the mechanically decoupled clarifier；The condensing heat exchanger and mechanically decoupled clarifier pass through respectively
Second pipeline is connected with the filter.
2. according to claim 1 after catalytic cracked regenerated exhuast gas desulfurization in gas desulfurizing agent recovery system, its feature exists
In the condensing heat exchanger is plate type heat exchanger or finned heat exchanger or tubular heat exchanger.
3. according to claim 1 after catalytic cracked regenerated exhuast gas desulfurization in gas desulfurizing agent recovery system, its feature exists
In the material of the condensing heat exchanger for austenitic stainless steel or two phase stainless steel or high silicon iron containing molybdenum or breathes out formula alloy or titanium conjunction
Gold or titanium.
4. according to claim 1 after catalytic cracked regenerated exhuast gas desulfurization in gas desulfurizing agent recovery system, its feature exists
In being inlayed on the windward side of the condensing heat exchanger or covered with enamel piece or potsherd.
5. according to claim 1 after catalytic cracked regenerated exhuast gas desulfurization in gas desulfurizing agent recovery system, its feature exists
In the mechanically decoupled clarifier is sieve plate or screen or louvered baffle plate.
6. according to claim 1 after catalytic cracked regenerated exhuast gas desulfurization in gas desulfurizing agent recovery system, its feature exists
In the material of the mechanically decoupled clarifier is enamel or ceramic material.
7. taken off after a kind of catalytic cracked regenerated exhuast gas desulfurization of recovery system recovery using any one of claim 1 to 6 in gas
The method of sulphur agent, it is characterised in that comprise the following steps：
S1, catalytic cracked regenerated waste gas are entered in the desulfurizing tower after progress desulfurization process, and the processed gas of generation is discharged to
In the condensing heat exchanger；
S2, the processed gas are cooled in the condensing heat exchanger, and condensation contains the mixing of water and desulfurizing agent
Liquid A, obtain the gas that cools；
S3, the cooling gas is discharged into the mechanically decoupled clarifier, isolates the mixed liquor in the cooling gas
B, it is purified gas；
S4, the slurry obtained after the mixed liquor A and mixed liquid B are mixed are all discharged into the filter, are filtered to remove it
In solid particle, and the filtrate containing desulfurizing agent is back in the desulfurizing tower with being repeated after the desulphurizer mixing that newly adds
Utilize；
S5, the purification gas is discharged into after carrying out heat temperature raising in the heating heat exchanger and discharged.
8. according to the method for claim 7, it is characterised in that in the S2, the processed gas is after cooling, its temperature
Degree reduces at least 3 DEG C.
9. according to the method for claim 7, it is characterised in that in the S5, the purification gas after heat temperature raising,
Its temperature increases at least 5 DEG C.
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| CN107837681B (en) | 2021-02-05 |
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