CN106731596A - Tail gas treatment method and system - Google Patents
Tail gas treatment method and system Download PDFInfo
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- CN106731596A CN106731596A CN201611046206.3A CN201611046206A CN106731596A CN 106731596 A CN106731596 A CN 106731596A CN 201611046206 A CN201611046206 A CN 201611046206A CN 106731596 A CN106731596 A CN 106731596A
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- Prior art keywords
- tail gas
- spent lye
- wash mill
- washing
- processing system
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 18
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 82
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 29
- 230000023556 desulfurization Effects 0.000 claims abstract description 26
- 238000005406 washing Methods 0.000 claims description 51
- 229910021529 ammonia Inorganic materials 0.000 claims description 39
- 238000010025 steaming Methods 0.000 claims description 20
- 239000003513 alkali Substances 0.000 claims description 19
- 239000003034 coal gas Substances 0.000 claims description 19
- 238000003672 processing method Methods 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 18
- 238000012545 processing Methods 0.000 claims description 18
- 239000007921 spray Substances 0.000 claims description 18
- 150000003863 ammonium salts Chemical class 0.000 claims description 17
- 239000007787 solid Substances 0.000 claims description 14
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 13
- 239000001117 sulphuric acid Substances 0.000 claims description 13
- 235000011149 sulphuric acid Nutrition 0.000 claims description 13
- 239000002699 waste material Substances 0.000 claims description 11
- 238000010521 absorption reaction Methods 0.000 claims description 10
- 230000001276 controlling effect Effects 0.000 claims description 8
- 239000000945 filler Substances 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 239000004743 Polypropylene Substances 0.000 claims description 5
- 230000008901 benefit Effects 0.000 abstract description 5
- 239000010808 liquid waste Substances 0.000 abstract description 5
- 239000003595 mist Substances 0.000 abstract 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 193
- 238000005201 scrubbing Methods 0.000 description 43
- 230000008569 process Effects 0.000 description 13
- RAHZWNYVWXNFOC-UHFFFAOYSA-N sulfur dioxide Inorganic materials O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 10
- 238000007254 oxidation reaction Methods 0.000 description 8
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 7
- 230000003009 desulfurizing effect Effects 0.000 description 6
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 4
- 235000011130 ammonium sulphate Nutrition 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- -1 polypropylene Polymers 0.000 description 4
- 229920001155 polypropylene Polymers 0.000 description 4
- 239000000443 aerosol Substances 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- PQUCIEFHOVEZAU-UHFFFAOYSA-N Diammonium sulfite Chemical compound [NH4+].[NH4+].[O-]S([O-])=O PQUCIEFHOVEZAU-UHFFFAOYSA-N 0.000 description 2
- 239000007832 Na2SO4 Substances 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 229940095054 ammoniac Drugs 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003911 water pollution Methods 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
- B01D53/48—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
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Gas Separation By Absorption (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention provides a tail gas treatment method and a tail gas treatment system. The invention has the advantages of high desulfurization efficiency and no pollution of a large amount of white gas mist, ammonia gas and the like in tail gas; and no liquid waste is generated, and no secondary pollution is caused.
Description
Technical field
The invention belongs to coal chemical technology, and in particular to the processing method and its system of a kind of tail gas.
Background technology
Routinely the general of application has ammonia scrubbing method etc., ammonia scrubbing method to the relieving haperacidity treating tail gas technology of gas desulfurizer
Technological principle with the NH in the aqueous solution3With SO2Based on reaction, the sulfur dioxide in tail gas is absorbed with remained ammonia, generation is sub-
Ammonium sulfate, ammonium sulfate, reaction belong to moment chemical reaction, while ammonium sulfite is ammonium sulfate by the dioxygen oxidation in tail gas, change
Learn reactional equation as follows：
Absorb:SO2+H2O+XNH3→(NH4)XH2-XSO3(ammonium sulfite)
Oxidation:(NH4)XH2-XSO3+1/2O2+(2-X)NH3→(NH4)2SO4(ammonium sulfate)；
Because above-mentioned reaction be weak acid, weak base react, washing, assimilation effect it is poor, easily decompose, release tail gas in still suffer from largely
SO2, Standard is not reached, and accordingly increased sour water.Simultaneously with blue smoke gas and white aerosol, tail in discharge process
Gas causes atypical pollution to air containing ammonia is high, and discharge penetrating odor is still dense, and environmental pollution is still serious.
The content of the invention
For drawbacks described above of the prior art, it is a primary object of the present invention to provide a kind of tail gas processing method and
Its system, can significantly improve the SO of tail gas2Removal efficiency, and liquid wastes are not produced, do not result in secondary pollution.
In order to achieve the above object, the present invention is adopted the following technical scheme that：A kind of processing method of tail gas, is to take off coal gas
The spent lye of sulphur device alkali wash section is used to wash the tail gas of coal gas desulfurization sulphuric acid plant, and the spent lye after the washing delivers to ammonia still process
System is decomposed for solid ammonium-salt.
As further preferably, the tail gas is the relieving haperacidity tail gas in the absorption tower of the gas desulfurizer.
As further preferably, the spent lye after the washing is circulated for washing the tail gas again.
A kind of processing system of tail gas, including wash mill, the tail gas are entered inside the wash mill by spent lye
Row washing, the wash mill includes gas inlet, outlet and spent lye entrance, outlet.
As further preferably, the gas inlet is arranged on the wash mill bottom, inside the wash mill
Top be provided with spray equipment, the spent lye is passed through in the spray equipment.
As further preferred, also including circulation washing pump, it is connected with spent lye pipeline, for controlling spent lye in institute
State the addition of wash mill interior circulation.
As further preferably, the spent lye porch is provided with regulating valve, enter in wash mill for adjusting
The salkali waste flow quantity in portion.
As further preferred, flowmeter is provided with the spent lye pipeline.
As further preferred, liquid level gauge is provided with the wash mill, for controlling inside the wash mill
The liquid level of spent lye.
As further preferably, a part of spent lye that the spent lye outlet is obtained is recycled into wash mill again
Interior, a part of spent lye is delivered to ammonia steaming system and is decomposed for solid ammonium-salt.
As further preferably, the wash mill is internally provided with polypropylene Bao ear ring filler.
As further preferably, the particle diameter of the polypropylene Pall ring filler is 25mm, and specific surface area is 238m2/m3,
Voidage is 0.73.
The beneficial effects of the invention are as follows：
(1) processing method of tail gas of the present invention, is to be used to the spent lye of gas desulfurizer (desulfurizing tower) alkali wash section wash
Relieving haperacidity tail gas is washed, the spent lye after the washing is delivered to ammonia steaming system and decomposed for solid ammonium-salt, compared with ammonia scrubbing method,
Have the advantages that desulfuration efficiency is high, in tail gas without a large amount of atypical pollutions of white aerosols and ammonia etc.；And do not produce liquid to give up
Thing, does not result in secondary pollution.
(2) processing method of tail gas of the present invention, technological process is simple, only need to set up washing tail gas device and washing pump, accounts for
Ground area is small, and investment and operating cost are relatively low.The relieving haperacidity tail gas in absorption tower using spent lye to coal gas desulfurization sulphuric acid plant
Washed, system SO can be significantly improved2Removal efficiency, without increasing extra alkali lye consumption, the spent lye after washing can be again
Return ammonia steaming system and be fixed ammonium salt decomposition, without further oxidation reaction, the treatment of wastes with processes of wastes against one another, non-secondary pollution.Investment reduction and
Operating cost is 5,000,000/year.
Brief description of the drawings
Fig. 1 is the structural representation of the processing system of the tail gas of the embodiment of the present invention 1.
Fig. 2 is the structural representation of the processing system of the tail gas of the embodiment of the present invention 2.
Fig. 3 is the structural representation of the processing system of the tail gas of the embodiment of the present invention 3.
Fig. 4 is the structural representation of the processing system of the tail gas of the embodiment of the present invention 4.
What is marked in accompanying drawing is described as follows：1- scrubbing towers, 11- gas inlets, 12- offgas outlets, 13- spent lyes entrance,
The outlet of 14- spent lyes, 15- spray equipments, 16- regulating valves, 17- chimneys, 18- flowmeters, 19- fillers, 2- desulfurizers, 21-
Gas entry, 22- gas exits, 23- spent lyes pipeline, 24- distilled ammonia wastewaters pipeline, 25-40% NaOH pipeline, 3- washings
Pump.
Specific embodiment
The present invention is by providing the processing method and its system of a kind of tail gas, and it is low to solve prior art desulfuration efficiency, dirty
The serious problem of dye, the present invention can significantly improve tail gas SO2Removal efficiency, and liquid wastes are not produced, do not result in secondary dirt
Dye.
In order to solve the above problems, main thought of the invention is：The processing method of embodiment of the present invention tail gas, is by coal
The spent lye of desulfurization device alkali wash section is used to wash tail gas, and the spent lye after the washing can deliver to ammonia steaming system for fixing
Ammonium salt decomposition.
The processing system of embodiment of the present invention desulfurization relieving haperacidity tail gas, including wash mill, the tail gas is in the washing dress
Put inside to be washed by spent lye, the wash mill includes gas inlet, outlet and spent lye entrance, outlet.
The problem of administering method and presence before embodiment of the present invention synthesis, it is considered to reduce improvement cost, utilize as far as possible
Existing equipment, optimize technique makes full use of internal salkali waste source in production process, i.e., using gas desulfurizer (desulfurizing tower) alkali cleaning
Spent lye washing tail gas after section, so that tail gas desulfurization effect is obviously improved.In addition, the spent lye after washing can deliver to ammonia still process
System removes solid ammonium-salt, without further oxidation reaction, does not produce liquid wastes, causes secondary pollution.
In addition, during treatment desulfurization relieving haperacidity tail gas, typically can be using the SO in 40% sodium hydroxide solution removing tail gas2、SO3,
With NaOH reaction generations Na2SO3、NaHSO3、Na2SO4.As directly discharge can cause water pollution.Being usually in a conventional method will
Absorbing liquid by No.1 oxidation troughs, No.2 oxidation troughs, is passed through air by Na again2SO3、NaHSO3It is oxidized to Na2SO4Afterwards, will discharge
Liquid gives water channel specialty.But thus complex process, floor space is big, investment and operating cost are high, need to consume substantial amounts of alkali
Raw material, and the concentrate of final oxidation need to transport outward treatment.
The large desulfurization device of coal gas desulfurization is referred to as desulfurizing tower, and is used for the small of coal-burned industrial boiler and kiln coal gas desulfurization
Being referred to as desulfurizing dust-collector type desulfation dust-extraction device more；Gas desulfurizer i.e. described in the embodiment of the present invention；In desulfurizing tower or de-
In sulphur deduster, typically containing SO2Tail gas, reply tail gas in SO2Carry out chemical absorbing.It is common in desulfurizer mainly to set
Standby is the capital equipments such as absorption tower, flue, chimney, desulfurization pump, booster fan.
Ammonia steaming system production described in the embodiment of the present invention is mainly by the remained ammonia from blasting condensation post in ammonia still process
Distillation treatment is carried out in tower, after steaming the volatilization ammonia in remained ammonia, is sent back in coal gas to increase coal gas ammon amount, and then
The yield of sulfate of ammoniac is improved, and distilled ammonia wastewater is delivered into biochemical sewage treatment process and processed.In ammoniacal liquor containing volatilization ammonia and
Stagnant ammonium, in order to decompose the Stagnant ammonium in remained ammonia, should add alkaline solution before ammonia still process, and Stagnant ammonium is resolved into volatilization ammonia
After steam.The embodiment of the present invention is decomposed using the spent lye after washing tail gas for solid ammonium-salt, further increases salkali waste
The utilization rate of liquid.
In order to above and other purpose, feature and the advantage of the present invention can be become apparent, number cited below particularly is implemented
Example illustrates the processing method and its system of tail gas of the present invention.
Embodiment 1
As shown in figure 1, the processing method of embodiment of the present invention tail gas, is by the spent lye of the alkali wash section of gas desulfurizer 2
Tail gas for washing coal gas desulfurization sulphuric acid plant, the spent lye after the washing delivers to ammonia steaming system for Stagnant ammonium salinity
Solution.The tail gas is the relieving haperacidity tail gas in the coal gas desulfurization sulphuric acid plant absorption tower.
The processing system of embodiment of the present invention desulfurization relieving haperacidity tail gas, including wash mill, the tail gas is in the washing dress
Put inside to be washed by spent lye, the wash mill is scrubbing tower 1, the scrubbing tower 1 includes gas inlet 11, outlet 12
And spent lye entrance 13, outlet 14.
Embodiment 2
As shown in Fig. 2 the processing method of embodiment of the present invention tail gas, is by the spent lye of the alkali wash section of gas desulfurizer 2
Tail gas for washing gas desulfurizer, the spent lye after the washing is delivered to ammonia steaming system and is decomposed for solid ammonium-salt.Institute
It is the relieving haperacidity tail gas in the coal gas desulfurization sulphuric acid plant absorption tower to state tail gas.Spent lye after the washing circulates be used for again
Wash the tail gas.
The processing system of embodiment of the present invention desulfidation tail gas, including wash mill, the tail gas is in the wash mill
Portion is washed by spent lye, the wash mill be scrubbing tower 1, the scrubbing tower 1 include gas inlet 11, outlet 12 and
Spent lye entrance 13, outlet 14.
The gas inlet 11 is arranged on the bottom of the scrubbing tower 1, and the top inside the scrubbing tower 1 is provided with spray dress
15 are put, the spent lye is passed through in the spray equipment 15.
Embodiment of the present invention exhaust treatment system also includes circulation washing pump 3, is connected with spent lye pipeline, for controlling to give up
Alkali lye sprays in the interior circulation of the scrubbing tower 1.
A part of spent lye that the spent lye outlet is obtained is recycled into scrubbing tower 1 again, another part spent lye
Ammonia steaming system is delivered to be decomposed for solid ammonium-salt.
Embodiment 3
As shown in figure 3, the processing method of embodiment of the present invention tail gas, is by the spent lye of the alkali wash section of gas desulfurizer 2
Tail gas for washing coal gas desulfurization sulphuric acid plant, the spent lye after the washing delivers to ammonia steaming system for Stagnant ammonium salinity
Solution.The tail gas is the relieving haperacidity tail gas in the coal gas desulfurization sulphuric acid plant absorption tower.Spent lye after the washing is followed again
Ring is used to wash the tail gas.
The processing system of embodiment of the present invention desulfurization relieving haperacidity tail gas, including wash mill, the tail gas is in the washing dress
Put inside to be washed by spent lye, the wash mill is scrubbing tower 1, the scrubbing tower 1 includes gas inlet 11, outlet 12
And spent lye entrance 13, outlet 14.
The gas inlet 11 is arranged on the bottom of the scrubbing tower 1, and the top inside the scrubbing tower 1 is provided with spray dress
15 are put, the spent lye is passed through in the spray equipment 15.
Embodiment of the present invention exhaust treatment system also includes circulation washing pump 3, is connected with spent lye pipeline, for controlling to give up
Alkali lye sprays in the interior circulation of the scrubbing tower 1.
A part of spent lye that the spent lye outlet is obtained is recycled into scrubbing tower 1 again, another part spent lye
Ammonia steaming system is delivered to be decomposed for solid ammonium-salt.
The spent lye porch is provided with regulating valve 16, for adjusting the salkali waste flow quantity entered inside wash mill,
The liquid level of spent lye in scrubbing tower 1 can also be adjusted.
Embodiment 4
As shown in figure 4, the processing method of embodiment of the present invention tail gas, is by the spent lye of the alkali wash section of gas desulfurizer 2
Tail gas for washing coal gas desulfurization sulphuric acid plant, the spent lye after the washing delivers to ammonia steaming system for Stagnant ammonium salinity
Solution.The tail gas is the relieving haperacidity tail gas in the coal gas desulfurization sulphuric acid plant absorption tower.Spent lye after the washing is followed again
Ring is used to wash the tail gas.
The processing system of embodiment of the present invention desulfurization relieving haperacidity tail gas, including wash mill, the tail gas is in the washing dress
Put inside to be washed by spent lye, the wash mill is scrubbing tower 1, the scrubbing tower 1 includes gas inlet 11, outlet 12
And spent lye entrance 13, outlet 14, tail gas enters chimney 17.
The gas inlet 11 is arranged on the bottom of the scrubbing tower 1, and the top inside the scrubbing tower 1 is provided with spray dress
15 are put, the spent lye is passed through in the spray equipment 15.
Embodiment of the present invention exhaust treatment system also includes circulation washing pump 3, is connected with spent lye pipeline, for controlling to give up
Alkali lye sprays in the interior circulation of the scrubbing tower 1.
A part of spent lye that the spent lye outlet is obtained is recycled into scrubbing tower 1 again, another part spent lye
Ammonia steaming system is delivered to be decomposed for solid ammonium-salt.
The spent lye porch is provided with regulating valve 16, for adjusting the salkali waste flow quantity entered inside scrubbing tower 1, also
The liquid level of spent lye in scrubbing tower 1 can be adjusted.
Flowmeter 18 is provided with the spent lye pipeline.
Liquid level gauge is provided with the wash mill, the liquid level for measuring the inside spent lye of the scrubbing tower 1.
Embodiment 5
As shown in figure 4, the processing method of embodiment of the present invention tail gas, is by the spent lye of the alkali wash section of gas desulfurizer 2
Tail gas for washing coal gas desulfurization sulphuric acid plant, the spent lye after the washing delivers to ammonia steaming system for Stagnant ammonium salinity
Solution.The tail gas is the relieving haperacidity tail gas in the coal gas desulfurization sulphuric acid plant absorption tower.Spent lye after the washing is followed again
Ring is used to wash the tail gas.
The processing system of embodiment of the present invention desulfidation tail gas, including wash mill, the tail gas is in the wash mill
Portion is washed by spent lye, the wash mill be scrubbing tower 1, the scrubbing tower 1 include gas inlet 11, outlet 12 and
Spent lye entrance 13, outlet 14, tail gas enters chimney 17.
The gas inlet 11 is arranged on the bottom of the scrubbing tower 1, and the top inside the scrubbing tower 1 is provided with spray dress
15 are put, the spent lye is passed through in the spray equipment 15.
Embodiment of the present invention exhaust treatment system also includes circulation washing pump 3, is connected with spent lye pipeline, for controlling to give up
Alkali lye sprays in the interior circulation of the scrubbing tower 1.
A part of spent lye that the spent lye outlet is obtained is recycled into scrubbing tower 1 again, another part spent lye
Ammonia steaming system is delivered to be decomposed for solid ammonium-salt.
The spent lye porch is provided with regulating valve 16, for adjusting the salkali waste flow quantity entered inside wash mill,
The liquid level of spent lye in scrubbing tower 1 can also be adjusted.
Flowmeter 18 is provided with the spent lye pipeline.
Liquid level gauge is provided with the scrubbing tower 1, the liquid level for measuring the inside spent lye of the scrubbing tower 1.
The scrubbing tower 1 is internally provided with polypropylene Bao ear ring filler 19, and the particle diameter of the polypropylene Pall ring filler is
25mm, specific surface area is 238m2/m3, voidage is 0.73.
The embodiment of the present invention sets up relieving haperacidity tail gas washing tower and circulation washing pumping system, on the basis of existing process pipeline
Transformation is optimized, the spent lye of the alkali wash section of desulfurizer 2 is caused in scrubbing tower 1, install 3 meters high poly- additional inside scrubbing tower
Propylene Bao ear ring filler 19 increases vapour-liquid contact area, and relieving haperacidity tail gas enters from bottom of towe, tail gas is followed by washing pump 3
Ring spray is spilt, reverse contact, and mass transport process is completed by packing layer, it is scrubbed after tail gas entered greatly into chimney 17 through tower top
Gas, part spent lye is emitted into ammonia steaming system and decomposes solid ammonium-salt.
Increase corresponding liquid level gauge, regulating valve and flowmeter on scrubbing tower 1 and part spent lye pipeline and implement automation control
System, so that the liquid level to vent gas washing system, circulation sprinkling flow regulate and control.
The technical parameter of the embodiment of the present invention is as follows：
Device parameter：
Scrubbing tower DN1600*9000 1
Circulating pump Q=40m3/ h H=20m 2.
Technical scheme in above-mentioned the embodiment of the present application, at least has the following technical effect that or advantage：
(1) processing method of tail gas of the present invention, is to be used to the spent lye of gas desulfurizer (desulfurizing tower) alkali wash section wash
Tail gas is washed, the spent lye after the washing is delivered to ammonia steaming system and decomposed for solid ammonium-salt, compared with ammonia scrubbing method, has
Desulfuration efficiency is high, in tail gas without the advantages of a large amount of atypical pollutions of white aerosols and ammonia etc.；And liquid wastes are not produced, no
Secondary pollution can be caused.
(2) processing method of tail gas of the present invention, technological process is simple, only need to set up washing tail gas device and washing pump, accounts for
Ground area is small, and investment and operating cost are relatively low.The relieving haperacidity tail gas in absorption tower using spent lye to coal gas desulfurization sulphuric acid plant
Washed, system SO can be significantly improved2Removal efficiency, without increasing extra alkali lye consumption, the spent lye after washing can be again
Return ammonia steaming system and be fixed ammonium salt decomposition, without further oxidation reaction, the treatment of wastes with processes of wastes against one another, non-secondary pollution.Investment reduction and
Operating cost is 5,000,000/year.
, but those skilled in the art once know basic creation although preferred embodiments of the present invention have been described
Property concept, then can make other change and modification to these embodiments.So, appended claims are intended to be construed to include excellent
Select embodiment and fall into having altered and changing for the scope of the invention.Obviously, those skilled in the art can be to the present invention
Carry out various changes and modification without departing from the spirit and scope of the present invention.So, if these modifications of the invention and modification
Belong within the scope of the claims in the present invention and its equivalent technologies, then the present invention is also intended to exist comprising these changes and modification
It is interior.
Claims (10)
1. a kind of processing method of tail gas, it is characterised in that：Methods described is to use the spent lye of gas desulfurizer alkali wash section
In the tail gas of washing coal gas desulfurization sulphuric acid plant, the spent lye after the washing is delivered to ammonia steaming system and is decomposed for solid ammonium-salt.
2. the processing method of tail gas according to claim 1, it is characterised in that：The tail gas is the coal gas desulfurization relieving haperacidity
Relieving haperacidity tail gas in the absorption tower of device.
3. the processing method of tail gas according to claim 1, it is characterised in that：Spent lye after the washing is circulated again
For washing the tail gas.
4. the processing system of the tail gas as described in claim any one of 1-3, it is characterised in that：Including wash mill, the tail
Gas is washed inside the wash mill by spent lye, and the wash mill includes gas inlet, outlet and spent lye
Entrance, outlet.
5. the processing system of tail gas according to claim 4, it is characterised in that：The gas inlet is arranged on the washing
Device bottom, the top inside the wash mill is provided with spray equipment, and the spent lye is passed through in the spray equipment.
6. the processing system of tail gas according to claim 4, it is characterised in that：Also include circulation washing pump, with spent lye
Pipeline is connected, for controlling spent lye to be added in the wash mill interior circulation.
7. the processing system of tail gas according to claim 4, it is characterised in that：The spent lye porch is provided with regulation
Valve, the regulating valve is used to adjust the salkali waste flow quantity entered inside wash mill.
8. the processing system of tail gas according to claim 4, it is characterised in that：Flow is provided with the spent lye pipeline
Meter, liquid level gauge is provided with the wash mill, the liquid level for controlling wash mill inside spent lye.
9. the processing system of tail gas according to claim 4, it is characterised in that：The part that the spent lye outlet is obtained
Spent lye is recycled into wash mill again, and a part of spent lye is delivered to ammonia steaming system and is decomposed for solid ammonium-salt.
10. the processing system of tail gas according to claim 4, it is characterised in that：The wash mill is internally provided with poly-
Propylene Bao ear ring filler.
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| CN201611046206.3A CN106731596A (en) | 2016-11-22 | 2016-11-22 | Tail gas treatment method and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611046206.3A CN106731596A (en) | 2016-11-22 | 2016-11-22 | Tail gas treatment method and system |
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| CN201611046206.3A Pending CN106731596A (en) | 2016-11-22 | 2016-11-22 | Tail gas treatment method and system |
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| CN111097273A (en) * | 2018-10-26 | 2020-05-05 | 中国石油化工股份有限公司 | Method and device for treating FCC (fluid catalytic cracking) regenerated flue gas |
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