CN107158918A - A kind of nitrate method phosphoric acid tail gas defluorinate denitration process system and processing method - Google Patents
A kind of nitrate method phosphoric acid tail gas defluorinate denitration process system and processing method Download PDFInfo
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- CN107158918A CN107158918A CN201710574600.2A CN201710574600A CN107158918A CN 107158918 A CN107158918 A CN 107158918A CN 201710574600 A CN201710574600 A CN 201710574600A CN 107158918 A CN107158918 A CN 107158918A
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- defluorinate
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- 238000000034 method Methods 0.000 title claims abstract description 81
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 229910000147 aluminium phosphate Inorganic materials 0.000 title claims abstract description 38
- 230000008569 process Effects 0.000 title claims abstract description 35
- 229910002651 NO3 Inorganic materials 0.000 title claims abstract description 31
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 238000003672 processing method Methods 0.000 title abstract description 7
- 239000007921 spray Substances 0.000 claims abstract description 113
- 230000004087 circulation Effects 0.000 claims abstract description 82
- 238000005201 scrubbing Methods 0.000 claims abstract description 70
- 238000005406 washing Methods 0.000 claims abstract description 53
- 238000004140 cleaning Methods 0.000 claims description 88
- 241000521257 Hydrops Species 0.000 claims description 44
- 206010030113 Oedema Diseases 0.000 claims description 44
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 32
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 19
- 230000008676 import Effects 0.000 claims description 18
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 15
- 229910052731 fluorine Inorganic materials 0.000 claims description 15
- 239000011737 fluorine Substances 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 15
- 238000000746 purification Methods 0.000 claims description 15
- 239000006260 foam Substances 0.000 claims description 13
- 230000008021 deposition Effects 0.000 claims description 9
- 125000004122 cyclic group Chemical group 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000001556 precipitation Methods 0.000 claims description 8
- 238000013461 design Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 230000003321 amplification Effects 0.000 claims 1
- 238000003199 nucleic acid amplification method Methods 0.000 claims 1
- 239000000203 mixture Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 90
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 7
- 239000002250 absorbent Substances 0.000 description 5
- 230000002745 absorbent Effects 0.000 description 5
- 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 4
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 239000011574 phosphorus Substances 0.000 description 4
- 239000011591 potassium Substances 0.000 description 4
- 229910052700 potassium Inorganic materials 0.000 description 4
- 239000011734 sodium Substances 0.000 description 4
- 229910052708 sodium Inorganic materials 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- 239000000920 calcium hydroxide Substances 0.000 description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- AZFNGPAYDKGCRB-XCPIVNJJSA-M [(1s,2s)-2-amino-1,2-diphenylethyl]-(4-methylphenyl)sulfonylazanide;chlororuthenium(1+);1-methyl-4-propan-2-ylbenzene Chemical compound [Ru+]Cl.CC(C)C1=CC=C(C)C=C1.C1=CC(C)=CC=C1S(=O)(=O)[N-][C@@H](C=1C=CC=CC=1)[C@@H](N)C1=CC=CC=C1 AZFNGPAYDKGCRB-XCPIVNJJSA-M 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 239000003337 fertilizer Substances 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 150000002828 nitro derivatives Chemical class 0.000 description 2
- 230000000505 pernicious effect Effects 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- NROKBHXJSPEDAR-UHFFFAOYSA-M potassium fluoride Chemical compound [F-].[K+] NROKBHXJSPEDAR-UHFFFAOYSA-M 0.000 description 2
- 235000010333 potassium nitrate Nutrition 0.000 description 2
- 239000004323 potassium nitrate Substances 0.000 description 2
- 235000010289 potassium nitrite Nutrition 0.000 description 2
- 239000004304 potassium nitrite Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000628997 Flos Species 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 229940087373 calcium oxide Drugs 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229940077441 fluorapatite Drugs 0.000 description 1
- 229910052587 fluorapatite Inorganic materials 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- VSIIXMUUUJUKCM-UHFFFAOYSA-D pentacalcium;fluoride;triphosphate Chemical compound [F-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O VSIIXMUUUJUKCM-UHFFFAOYSA-D 0.000 description 1
- 150000003017 phosphorus Chemical class 0.000 description 1
- 229910000027 potassium carbonate Inorganic materials 0.000 description 1
- 239000011698 potassium fluoride Substances 0.000 description 1
- 235000003270 potassium fluoride Nutrition 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- ABTOQLMXBSRXSM-UHFFFAOYSA-N silicon tetrafluoride Chemical group F[Si](F)(F)F ABTOQLMXBSRXSM-UHFFFAOYSA-N 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000003643 water by type Substances 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
- B01D53/74—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
- 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
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen 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
- B01D53/46—Removing components of defined structure
- B01D53/68—Halogens or halogen compounds
-
- 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
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/306—Alkali metal compounds of potassium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/20—Halogens or halogen compounds
- B01D2257/204—Inorganic halogen compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/20—Halogens or halogen compounds
- B01D2257/204—Inorganic halogen compounds
- B01D2257/2047—Hydrofluoric acid
-
- 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
- B01D2258/0225—Other waste gases from chemical or biological warfare
Abstract
The invention provides a kind of nitrate method phosphoric acid tail gas defluorinate denitration process system and processing method, system composition includes Venturi scrubbing subsystem, a spray column and washs subsystem and secondary Venturi scrubbing subsystem；The spray column washing subsystem is made up of spray scrubber and scrubbing tower circulating pump, Venturi scrubbing subsystem includes first circulation dislodger, it is arranged on straight tube washer and first circulation pump on the first Venturi scrubber on first circulation dislodger inlet exhaust gas and outlet, the secondary Venturi scrubbing subsystem includes second circulation dislodger, is arranged on pot type washer and second circulation pump on the second Venturi scrubber and gas outlet on second circulation dislodger air inlet.Defluorinate denitration process is carried out to nitrate method phosphoric acid tail gas using the present invention, defluorinate denitration efficiency is substantially increased, has saved cost of investment, operating cost and floor space.
Description
Technical field
The invention belongs to phosphoric acid by wet process tail gas defluorinate denitration technology field, and in particular to a kind of nitrate method phosphoric acid tail gas defluorinate
Denitration process system and processing method.
Background technology
The production of nitrate method phosphoric acid makees raw material using phosphorus ore mostly, and this phosphorus ore is main by fluorapatite (Ca5F
(PO4)3) composition, also part of silica.Phosphorus ore and nitric acid are after the reaction of acidolysis groove, and the fluorine in gas phase is main with ocratation
(SiF4) form presence, simultaneously containing partially fluorinated hydrogen (HF), the decomposition of concentrated nitric acid can also produce nitrogen dioxide (NO2) gas, because
SiF is mainly contained in this acidolysis groove tail gas4、HF、NO2Deng pernicious gas.These pernicious gases pollute environment and to the health of human body
Huge threat is caused, therefore, in environmental requirement strict today increasingly, processing to nitrate method phosphoric acid tail gas and profit is reclaimed
With particularly important.
The handling process method of current nitrate method phosphoric acid tail gas mainly has calcium method, sodium method and potassium method, and calcium method, which is mainly, uses carbon
Sour calcium and calcium hydroxide make absorbent, because calcium carbonate method absorption efficiency is low, investment big, so chemical industry acid tail gas is main at present
Calcium hydroxide is used for absorbent, but absorbent is made of calcium hydroxide and invests larger, scaling degree is high, easy plug nozzle,
Cause the removal efficiency step-down of spray column.Sodium method, which is mainly, makes absorbent of sodium carbonate and sodium hydroxide, but the raw material of sodium method
Cost is too high, does not typically use sodium method to be used as handling process.Potassium method mainly makees absorbent with potassium carbonate and potassium hydroxide,
Handle that nitrate method phosphoric acid tail gas investment cost is relatively low with potassium method, scaling degree is relatively low, can make full use of having in cleaning solution
Nutrient is imitated to produce nitro-compound fertilizer.
A kind of number of patent application 201520426447.5, the utility model of entitled " efficient phosphoric acid tail gas wash mill " is special
Profit, its structure includes alkali lye configured slot, cleaning solution circulating slot and multiple scrubbing towers etc., although can by valve and circulating pump come
Control washing concentration of slurry, reduces the usage amount of alkali lye, so that some wastes are avoided, but it cannot be guaranteed that washing slurries exist
It is uniformly distributed in multiple scrubbing towers, wastes the efficiency of a part of scrubbing tower, and multiple scrubbing towers are connected and cause floor space
Greatly increase, cost also accordingly increases.
The content of the invention
The purpose of the present invention exactly for it is above-mentioned the problems of in the prior art and not enough there is provided a kind of nitrate method phosphorus
Sour tail gas defluorinate denitration process system and processing method, to improve defluorinate denitration efficiency, spray cleaning solution is dense in system
Spend uniform and controllable, effectively save cost of investment, operating cost and floor space, the nitrate method phosphoric acid tail gas after being handled through system
Defluorinate efficiency >=80%, denitration efficiency >=40%, reach discharging standards.
For achieving the above object, the present invention is adopted the following technical scheme that.
A kind of nitrate method phosphoric acid tail gas defluorinate denitration process system, including Venturi scrubbing subsystem, a spray column are washed
Wash subsystem and secondary Venturi scrubbing subsystem；The spray column washs subsystem by spray scrubber and scrubbing tower circulating pump
Constitute, the spray scrubber internal upper part spatial design has bottom in spray thrower and the demister above spray thrower, tower empty
Between be designed with cleaning solution hydrops room and the gas distributor above hydrops room, import and the hydrops room of scrubbing tower circulating pump
Circulating cleaning solution outlet, the tail gas after a Venturi scrubbing subsystem defluorinate denitration process is by positioned at hydrops room liquid level
The air inlet of top enters in tower, enters spray washing space by gas distributor, with washing for being sprayed by spray thrower shower nozzle
Wash the fluorine and nitre in liquid haptoreaction abjection tail gas, purification gas after defluorinate denitration after demister foam removal by tower top end row
Outlet discharge, enters secondary Venturi scrubbing subsystem by pipeline, has adsorbed fluorine, the cleaning solution of nitre component by gas distributor
Into hydrops room；
Venturi scrubbing subsystem includes first circulation dislodger, is arranged on first circulation dislodger tail gas and enters
The straight tube washer and first circulation pump on the first Venturi scrubber and outlet on mouth, the first circulation dislodger is set
Interface tube, cleaning solution loop exit and precipitation outlet that subsystem hydrops room is connected, first circulation are washed in respect of with spray column
The outlet of pump is connected with the shower nozzle set in two washers, and import and the cleaning solution loop exit of first circulation dislodger connect
Logical, the air inlet of the first Venturi scrubber is connected with pending fluorinated tail gas source, and the gas outlet of straight tube washer passes through pipeline
The inlet exhaust gas for washing subsystem hydrops room ullage with spray column is connected, and pending fluorinated tail gas is washed through the first venturi
Wash after primary wash defluorinate denitration of device, straight tube washer is entered by first circulation dislodger, through secondary primary wash defluorinate
Enter spray column after denitration and wash subsystem, the cleaning solution after washing flows into first circulation dislodger；
The secondary Venturi scrubbing subsystem includes second circulation dislodger, is arranged on second circulation dislodger air inlet
On the second Venturi scrubber and gas outlet on pot type washer and second circulation pump, the second circulation dislodger sets
Interface tube, cleaning solution loop exit and precipitation outlet that subsystem hydrops room is connected, second circulation are washed in respect of with spray column
The outlet of pump is connected with the shower nozzle set in two washers, and import and the cleaning solution loop exit of second circulation dislodger connect
Logical, the air inlet of the second Venturi scrubber is connected with spray column washing subsystem purified gas outlet, from spray column washing
The purified gas of subsystem is washed after washing defluorinate denitration purification through the second Venturi scrubber by second circulation dislodger into pot type
Device is washed, the purified gas after washing defluorinate denitration purification again, by the demister foam removal for being arranged on pot type washer shower nozzle rear
Heel row amplifies gas.
Above-mentioned processing system is additionally provided with the cleaning solution being made up of cleaning solution make-up tank and delivery pump and adds system, delivery pump
Import connected with cleaning solution make-up tank, outlet is washed subsystem hydrops room with spray column and connected, or with secondary Venturi scrubbing
Subsystem second circulation dislodger is connected.
Above-mentioned first Venturi scrubber and straight tube washer, which are erect, to be arranged on first circulation dislodger top cover.
Above-mentioned second Venturi scrubber and pot type washer, which are erect, to be arranged on second circulation dislodger top cover.
Of first circulation dislodger and secondary Venturi scrubbing subsystem in an above-mentioned Venturi scrubbing subsystem
Two cyclic deposition grooves can be two independent cyclic deposition grooves, or same cyclic deposition groove be separated into by dividing plate two
Individual part, two logical positions of even same cyclic deposition groove.
Spray thrower in above-mentioned spray column washing subsystem is made up of 2-3 layers of spray head layer, if every layer of spray head layer respectively by
Dry equally distributed shower nozzle is constituted.Upper lower nozzle mutual dislocation is set between adjacent spray head layer.Each spray head layer of spray thrower respectively by
The circulating pump being each equipped with provides cleaning solution.
What the present invention was provided carries out defluorinate denitration process method with above-mentioned nitrate method phosphoric acid tail gas defluorinate denitration process system,
Be using potassium hydroxide solution as defluorinate denitration cleaning solution, take Venturi scrubbing subsystem, spray column washing subsystem and
The tail gas that secondary Venturi scrubbing subsystem is produced to nitrate method production process of phosphoric acid carries out defluorinate denitration；Washed in a venturi
Wash in subsystem, using the straight tube on the first Venturi scrubber and outlet conduit being arranged in first circulation dislodger import
Cleaning solution, the scrubbed device of shower nozzle circulative convection set in two washers is pumped into using first circulation pump and comes from nitre by washer
The fluorine-containing nitre tail gas that acid system production process of phosphoric acid is produced is washed；
In spray column washing subsystem, the tail gas from the preliminary defluorinate denitration purification of a Venturi scrubbing subsystem enters
Enter spray scrubber lower wash liquid hydrops room superjacent air space, cleaning solution is added to positioned at the cleaning solution hydrops room of tower inner bottom part
Interior, the tail gas into spray scrubber bottom hydrops room ullage space enters through being located at the gas distributor above hydrops room
Defluorinate space is washed, cleaning solution is pumped into the spray thrower positioned at tower internal upper part space by scrubbing tower circulating pump, equal by constituting spray thrower
The shower nozzle of even distribution sprays, the abundant haptoreaction of tail gas with entering washing defluorinate space, fluorine in washing abjection tail gas,
Nitre, defluorinate denitration purified gas is discharged into secondary text after the demister foam removal above spray thrower by purified gas outlet
Subsystem is washed in mound, the cleaning solution after washing enters hydrops room by gas distributor；
In secondary Venturi scrubbing subsystem, using the Venturi scrubber being arranged in second circulation dislodger import
With the pot type washer in outlet, cleaning solution is pumped into the shower nozzle circulative convection set in two washers using second circulation pump
Scrubbed device carries out further defluorinate purification from spray column washing subsystem purified gas, again purified gas
Air is discharged through foam removal, cleaning solution flows into the second circulation dislodger being located at below washer.
When the pH value of cleaning solution in the cleaning solution hydrops room of spray scrubber is less than 5.2, after circulation defluorinate denitration
Cleaning solution is discharged from defluorinate denitration process system, adds fresh cleaning solution, to strengthen washing mass transfer power.
The purified gas again discharges air through foam removal, refers to that the tail gas for being up to discharge standard is sent into by blower fan
Tail gas funnel is emitted into air.
The potassium hydroxide wash configured in cleaning solution make-up tank, its mass concentration general control is in 18~22% models
Enclose.
During the present invention carries out defluorinate denitration using potassium hydroxide wash to phosphoric acid tail gas, the HF in phosphoric acid tail gas
The SiF in potassium fluoride, phosphoric acid tail gas is generated with potassium hydroxide reaction4With potassium hydroxide reaction generation potassium fluosilicate precipitation, phosphoric acid
NO in tail gas2With potassium hydroxide reaction generation potassium nitrate and potassium nitrite, potassium nitrite meeting under conditions of air capacity is more
Oxidation generation potassium nitrate.
The present invention has the advantages that：
1. the present invention washs subsystem by Venturi scrubbing subsystem, spray column and secondary Venturi scrubbing point is
System carries out defluorinate denitration process to phosphoric acid tail gas, and tail gas is washed through five circulations, nitrogen oxides and fluoride is handled more
Thoroughly, the treatment effeciency of whole system is also greatly improved.
2. the spray thrower of washer is made up of 2-3 layers of spray head layer in spray column washing subsystem of the present invention, adjacent spray head layer
Between upper lower nozzle mutual dislocation set, each spray head layer provides cleaning solution by the circulating pump being each equipped with respectively, cleaning solution is existed
The flow for being uniformly distributed in scrubbing tower and flowing through each spray head layer is equal, and makes almost completely homogeneously to enter on scrubbing tower section
Row spray, effectively improves operating efficiency, improves the utilization rate of cleaning solution.
3. the system that the present invention is provided is compared with multitower train, reduces floor space and greatly reduce, saved sky
Between.
4. the addition of fresh potassium hydroxide wash is the pH value by cleaning solution in scrubbing tower in processing method of the present invention
Automatically control, be precisely controlled the quantity delivered of potassium hydroxide wash, it is ensured that carry out to system steady and continuous, effectively
Cost is reduced, the utilization rate of cleaning solution is improved, power consumption is reduced.
5. discharging fluorine-containing nitre cleaning solution in processing method of the present invention, resource can be realized for production nitro-compound fertilizer
Comprehensive utilization.
Brief description of the drawings
Fig. 1 is the overall structure diagram of nitrate method phosphoric acid tail gas defluorinate denitration process system of the present invention.
In figure, the Venturi scrubbers of 1- first, 2A- first circulation dislodgers, 2B- second circulation dislodgers, 3- delivery pumps,
4- cleaning solution make-up tanks, 4A- medicaments addition mouth, 5- spray scrubbers, 5A- gas distributors, 5B- spray throwers, 5C- demisters,
5D- scrubbing tower circulating pumps, 6- straight tube washers, the Venturi scrubbers of 7- second, 8- pot type washers, 9- blower fans, 10- exhaust smokes
Chimney, 11- flow valves, 12- process waters addition mouth.
Embodiment
Embodiment is provided below in conjunction with the accompanying drawings and the present invention is described in further detail by embodiment.But need to refer to
Go out, embodiment is not meant to be any restriction to the scope of the present invention.
As shown in figure 1, a kind of nitrate method phosphoric acid tail gas defluorinate denitration process system, including a Venturi scrubbing point is
System, spray column washing subsystem, secondary Venturi scrubbing subsystem and the washing being made up of cleaning solution make-up tank 4 and delivery pump 3
Liquid adds system.
The spray column washing subsystem is made up of spray scrubber 5 and scrubbing tower circulating pump 5D, the spray scrubber 5
Internal upper part spatial design has lower space in spray thrower 5B and the demister 5C above spray thrower, tower to be designed with cleaning solution product
Liquid room and the gas distributor 5A above hydrops room, are provided between gas distributor 5A and spray thrower 5B and supply adding technology water
Process water addition mouth 12；Cleaning solution hydrops room is designed with fresh wash liquid and adds mouth, and liquid precipitate is washed in circulating cleaning solution outlet
Floss hole and it is designed with inlet exhaust gas in cleaning solution ullage space；Scrubbing tower circulating pump 5D import and the circulation of hydrops room
Cleaning solution outlet, outlet and spray thrower inlet communication；Spray thrower 5B in spray column washing subsystem is by 2 layers of spray head layer structure
Into every layer of spray head layer is respectively made up of some equally distributed shower nozzles, and upper lower nozzle mutual dislocation is set between adjacent spray head layer
Put, each spray head layer of spray thrower provides cleaning solution by the circulating pump being each equipped with respectively, through a Venturi scrubbing subsystem defluorinate
Tail gas after denitration process enters spray washing by entering positioned at the air inlet of hydrops room ullage in tower by gas distributor
Space, with sprayed by spray thrower 5B shower nozzles cleaning solution haptoreaction abjection tail gas in fluorine and nitre, after defluorinate denitration
Purification gas is discharged after demister 5C foam removals by the outlet at tower top end, and entering secondary Venturi scrubbing point by pipeline is
System, has adsorbed fluorine, the cleaning solution of nitre component enters hydrops room by gas distributor；
Venturi scrubbing subsystem includes first circulation dislodger 2A, is arranged on first circulation dislodger tail gas
The straight tube washer 6 and first circulation pump on the first Venturi scrubber 1 and outlet in import, the first Venturi scrubber
1 and straight tube washer 6 erect and be arranged on first circulation dislodger 2A top covers, the first circulation dislodger 2A be designed with
Interface tube, cleaning solution loop exit and the precipitation outlet of spray column washing subsystem hydrops room connection, first circulation pump goes out
Mouth is connected with the shower nozzle set in two washers, and import is connected with first circulation dislodger 2A cleaning solution loop exit, the
The air inlet of one Venturi scrubber 1 is connected with pending fluorinated tail gas source, and the gas outlet of straight tube washer 6 passes through pipeline and spray
The inlet exhaust gas connection of tower washing subsystem hydrops room ullage is drenched, pending fluorinated tail gas is through the first Venturi scrubber
After 1 primary wash defluorinate denitrations, straight tube washer 6 is entered by first circulation dislodger 2A, through secondary primary wash defluorinate
Enter spray column after denitration and wash subsystem, the cleaning solution after washing flows into first circulation dislodger 2A；
The secondary Venturi scrubbing subsystem includes second circulation dislodger 2B, is arranged on second circulation dislodger 2B and enters
The second Venturi scrubber 7 on gas port and pot type washer 8 and second circulation pump on gas outlet, the second Venturi scrubbing
Device 7 and pot type washer 8, which are erect, to be arranged on second circulation dislodger 2B top covers, and the second circulation dislodger 2B is designed with
Interface tube, cleaning solution loop exit that subsystem hydrops room is connected are washed with spray column, and in a Venturi scrubbing subsystem
First circulation dislodger 2A and secondary Venturi scrubbing subsystem second circulation dislodger 2B be same cyclic deposition groove
Two positions, share one precipitation outlet, second circulation pump outlet with two washers in setting shower nozzle connect, enter
Mouth is connected with second circulation dislodger 2B cleaning solution loop exit, and the air inlet of the second Venturi scrubber 7 is washed with spray column
The connection of subsystem purified gas outlet is washed, the purified gas for washing subsystem from spray column is washed through the second Venturi scrubber 7
Pot type washer 8 is entered by second circulation dislodger 2B after defluorinate denitration purification, it is net after washing defluorinate denitration purification again
Change gas, gas is amplified by the demister foam removal heel row for being arranged on the shower nozzle rear of pot type washer 8.
The cleaning solution being made up of cleaning solution make-up tank 4 and delivery pump 3 adds system, and import and the cleaning solution of delivery pump 3 are matched somebody with somebody
Groove 4 processed is connected, and outlet is connected and provided with flow valve 11 with spray column washing subsystem hydrops room；Cleaning solution make-up tank 4 is provided with
Medicament addition mouth 4A.
Above-mentioned nitrate method phosphoric acid tail gas defluorinate denitration process system carries out defluorinate denitration process method, is molten with potassium hydroxide
Liquid is defluorinate denitration cleaning solution, takes Venturi scrubbing subsystem, a spray column to wash subsystem and secondary Venturi scrubbing
The tail gas that subsystem is produced to nitrate method production process of phosphoric acid carries out defluorinate denitration；In a Venturi scrubbing subsystem, adopt
With the straight tube washer 6 on the first Venturi scrubber 1 and outlet conduit being arranged in first circulation dislodger 2A imports, make
Cleaning solution is pumped into the scrubbed device of shower nozzle circulative convection set in two washers with first circulation pump and comes from nitrate method phosphoric acid
The fluorine-containing nitre tail gas that production process is produced is washed；
In spray column washing subsystem, the tail gas from the preliminary defluorinate denitration purification of a Venturi scrubbing subsystem enters
Enter the lower wash liquid hydrops room superjacent air space of spray scrubber 5, fresh wash liquid is added to the cleaning solution product positioned at tower inner bottom part
In liquid room, the tail gas into the bottom hydrops room ullage space of spray scrubber 5 is through being located at the gas distribution above hydrops room
Device 5A enters washing defluorinate space, and cleaning solution is pumped into the spray thrower 5B positioned at tower internal upper part space by scrubbing tower circulating pump 5D, by
Constitute the equally distributed shower nozzles of spray thrower 5B to spray, the abundant haptoreaction of tail gas with entering washing defluorinate space, washing
Deviate from fluorine, the nitre in tail gas, defluorinate denitration purified gas is after the demister 5C foam removals above spray thrower 5B by purified gas
Outlet is discharged into secondary Venturi scrubbing subsystem, and the cleaning solution after washing enters hydrops room by gas distributor, via
The cleaning solution internal circulating load of scrubbing tower circulating pump supply is 28~30m3/h；
In secondary Venturi scrubbing subsystem, using the Venturi scrubbing being arranged in second circulation dislodger 2B imports
Cleaning solution, the shower nozzle circulation set in two washers is pumped into using second circulation pump by the pot type washer 8 on device 7 and outlet
The scrubbed device of convection current carries out further defluorinate purification from spray column washing subsystem purified gas, after purifying again
Gas is sent into tail gas funnel 10 by blower fan 9 through foam removal and is emitted into air, and cleaning solution flows into second be located at below washer and followed
Ring dislodger 2B.
When the pH value of cleaning solution in the cleaning solution hydrops room of spray scrubber 5 is less than 5.2, after circulation defluorinate denitration
Cleaning solution is discharged from defluorinate denitration process system, adds fresh cleaning solution, to strengthen washing mass transfer power, potassium hydroxide washing
Liquid concentration is 18~22%, and intake is 9~11kg/h.
Claims (10)
1. a kind of nitrate method phosphoric acid tail gas defluorinate denitration process system, it is characterised in that including Venturi scrubbing subsystem,
Spray column washs subsystem and secondary Venturi scrubbing subsystem；Spray column washing subsystem by spray scrubber (5) and
Scrubbing tower circulating pump (5D) is constituted, and spray scrubber (5) the internal upper part spatial design has spray thrower (5B) and positioned at spray thrower
Lower space is designed with cleaning solution hydrops room and the gas distributor above hydrops room in the demister (5C) of top, tower
(5A), the import of scrubbing tower circulating pump (5D) and the circulating cleaning solution outlet of hydrops room, be through a Venturi scrubbing point
Tail gas after defluorinate denitration process of uniting is entered by gas distributor and sprayed by entering positioned at the air inlet of hydrops room ullage in tower
Scrubbing space is drenched, the fluorine and nitre in tail gas, defluorinate are deviate from cleaning solution haptoreaction spray by spray thrower (5B) shower nozzle
Purification gas after denitration is discharged after demister (5C) foam removal by the outlet at tower top end, enters secondary venturi by pipeline
Subsystem is washed, fluorine has been adsorbed, the cleaning solution of nitre component enters hydrops room by gas distributor；
Venturi scrubbing subsystem includes first circulation dislodger (2A), is arranged on first circulation dislodger tail gas and enters
The straight tube washer (6) and first circulation pump on the first Venturi scrubber (1) and outlet on mouth, the first circulation is sunk
Product groove (2A) is designed with washs interface tube, cleaning solution loop exit and precipitation discharge that subsystem hydrops room is connected with spray column
Mouthful, the outlet of first circulation pump is connected with the shower nozzle set in two washers, and import is washed with first circulation dislodger (2A's)
The connection of liquid loop exit is washed, the air inlet of the first Venturi scrubber (1) is connected with pending fluorinated tail gas source, straight tube washer
(6) inlet exhaust gas that subsystem hydrops room ullage is washed in gas outlet by pipeline and spray column is connected, and pending contains
Fluorine tail gas enters straight after (1) the primary wash defluorinate denitration of the first Venturi scrubber by first circulation dislodger (2A)
Pipe washer (6), spray column is entered after secondary primary wash defluorinate denitration and washs subsystem, and cleaning solution after washing flows into the
One cyclic deposition groove (2A)；
The secondary Venturi scrubbing subsystem includes second circulation dislodger (2B), is arranged on second circulation dislodger (2B) and enters
The pot type washer (8) and second circulation pump on the second Venturi scrubber (7) and gas outlet on gas port, described second follows
Ring dislodger (2B) is designed with washs interface tube, cleaning solution loop exit and precipitation row that subsystem hydrops room is connected with spray column
Outlet, the outlet of second circulation pump is connected with the shower nozzle set in two washers, import and second circulation dislodger (2B)
Cleaning solution loop exit is connected, and air inlet and the spray column of the second Venturi scrubber (7) wash subsystem purified gas outlet
Connection, the purified gas for washing subsystem from spray column defluorinate denitration purification is washed through the second Venturi scrubber (7) after by the
Two cyclic deposition grooves (2B) enter pot type washer (8), the purified gas after washing defluorinate denitration purification again, by being arranged on tank
The demister foam removal heel row amplification gas at formula washer (8) shower nozzle rear.
2. nitrate method phosphoric acid tail gas defluorinate denitration process system according to claim 1, it is characterised in that be provided with by washing
Wash the cleaning solution addition system that liquid make-up tank (4) and delivery pump (3) are constituted, import and the cleaning solution make-up tank (4) of delivery pump (3)
Connection, outlet is washed subsystem hydrops room with spray column and connected, or with secondary Venturi scrubbing subsystem second circulation dislodger
(2A) is connected.
3. nitrate method phosphoric acid tail gas defluorinate denitration process system according to claim 1, it is characterised in that the first venturi
Washer (1) and straight tube washer (6) are erect and are arranged on first circulation dislodger (2A) top cover.
4. nitrate method phosphoric acid tail gas defluorinate denitration process system according to claim 1, it is characterised in that the second venturi
Washer (7) and pot type washer (8) are erect and are arranged on second circulation dislodger (2B) top cover.
5. the nitrate method phosphoric acid tail gas defluorinate denitration process system according to one of Claims 1-4, it is characterised in that one
The second circulation deposition of first circulation dislodger (2A) and secondary Venturi scrubbing subsystem in secondary Venturi scrubbing subsystem
Groove (2B) is two positions of same cyclic deposition groove, shares a precipitation outlet.
6. the nitrate method phosphoric acid tail gas defluorinate denitration process system according to one of Claims 1-4, it is characterised in that spray
The spray thrower (5B) drenched in tower washing subsystem is made up of 2-3 layers of spray head layer, and every layer of spray head layer is respectively uniformly distributed by some
Shower nozzle constitute.
7. nitrate method phosphoric acid tail gas defluorinate denitration process system according to claim 6, it is characterised in that adjacent spray head layer
Between upper lower nozzle mutual dislocation set.
8. nitrate method phosphoric acid tail gas defluorinate denitration process system according to claim 7, it is characterised in that spray thrower respectively sprays
Head layer provides cleaning solution by the circulating pump being each equipped with respectively.
9. defluorinate denitration process method is carried out using nitrate method phosphoric acid tail gas defluorinate denitration process system described in claim 1 to 8,
Characterized in that, using potassium hydroxide solution as defluorinate denitration cleaning solution, taking Venturi scrubbing subsystem, a spray column washing
The tail gas that subsystem and secondary Venturi scrubbing subsystem are produced to nitrate method production process of phosphoric acid carries out defluorinate denitration；Once
In Venturi scrubbing subsystem, using the first Venturi scrubber (1) being arranged in first circulation dislodger (2A) import and
Cleaning solution, the shower nozzle set in two washers is pumped into using first circulation pump and is followed by the straight tube washer (6) on outlet conduit
The scrubbed device of ring convection current is washed from the fluorine-containing nitre tail gas that nitrate method production process of phosphoric acid is produced；
In spray column washing subsystem, the tail gas from the preliminary defluorinate denitration purification of a Venturi scrubbing subsystem enters spray
Scrubbing tower (5) lower wash liquid hydrops room superjacent air space is drenched, cleaning solution is added in the cleaning solution hydrops room of tower inner bottom part,
The gas distributor (5A) passed through into the tail gas of spray scrubber (5) bottom hydrops room ullage space above hydrops room
Into washing defluorinate space, cleaning solution is pumped into the spray thrower (5B) positioned at tower internal upper part space by scrubbing tower circulating pump (5D), by
Constitute spray thrower (5B) equally distributed shower nozzle to spray, the abundant haptoreaction of tail gas with entering washing defluorinate space is washed
Wash abjection tail gas in fluorine, nitre, defluorinate denitration purified gas after demister (5C) foam removal above spray thrower (5B) by
Purified gas outlet is discharged into secondary Venturi scrubbing subsystem, and the cleaning solution after washing enters hydrops by gas distributor
Room；
In secondary Venturi scrubbing subsystem, using the Venturi scrubber being arranged in second circulation dislodger (2B) import
(7) and outlet on pot type washer (8), cleaning solution is pumped into the shower nozzle set in two washers using second circulation pump and followed
The scrubbed device of ring convection current carries out further defluorinate purification from spray column washing subsystem purified gas, after purifying again
Gas through foam removal discharge air, cleaning solution flow into be located at washer below second circulation dislodger (2B).
10. nitrate method phosphoric acid tail gas defluorinate denitration process method according to claim 9, it is characterised in that when spray is washed
When the pH value for washing cleaning solution in the cleaning solution hydrops room of tower (5) is less than 5.2, the cleaning solution circulated after defluorinate denitration is taken off from defluorinate
Nitre processing system is discharged, and adds fresh cleaning solution, to strengthen washing mass transfer power.
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| CN201710574600.2A CN107158918A (en) | 2017-07-10 | 2017-07-10 | A kind of nitrate method phosphoric acid tail gas defluorinate denitration process system and processing method |
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Cited By (3)
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| CN110270197A (en) * | 2019-06-28 | 2019-09-24 | 贵州开磷集团矿肥有限责任公司 | A kind of washing system of phosphoric acid extraction tail gas |
| CN110482557A (en) * | 2019-09-20 | 2019-11-22 | 瓮福达州化工有限责任公司 | A kind of fluorine recovery system in phosphoric acid production technique |
| CN113521929A (en) * | 2021-08-20 | 2021-10-22 | 骏化生态工程有限公司 | Method for washing particles in tail gas of compound fertilizer |
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Application publication date: 20170915 |