CN108050850B - Yellow phosphorus tail gas boiler flue gas purification system and purification method - Google Patents
Yellow phosphorus tail gas boiler flue gas purification system and purification method Download PDFInfo
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- CN108050850B CN108050850B CN201711065046.1A CN201711065046A CN108050850B CN 108050850 B CN108050850 B CN 108050850B CN 201711065046 A CN201711065046 A CN 201711065046A CN 108050850 B CN108050850 B CN 108050850B
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- flue gas
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- desulfurization
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- 239000007789 gas Substances 0.000 title claims abstract description 152
- 239000003546 flue gas Substances 0.000 title claims abstract description 99
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 98
- OBSZRRSYVTXPNB-UHFFFAOYSA-N tetraphosphorus Chemical compound P12P3P1P32 OBSZRRSYVTXPNB-UHFFFAOYSA-N 0.000 title claims abstract description 94
- 238000000746 purification Methods 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 75
- 230000023556 desulfurization Effects 0.000 claims abstract description 75
- 238000002485 combustion reaction Methods 0.000 claims abstract description 51
- 230000008569 process Effects 0.000 claims abstract description 19
- 239000002737 fuel gas Substances 0.000 claims abstract description 7
- 230000002401 inhibitory effect Effects 0.000 claims abstract description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 36
- 229910052757 nitrogen Inorganic materials 0.000 claims description 35
- 239000011941 photocatalyst Substances 0.000 claims description 22
- 238000011084 recovery Methods 0.000 claims description 19
- 230000008929 regeneration Effects 0.000 claims description 17
- 238000011069 regeneration method Methods 0.000 claims description 17
- 239000002918 waste heat Substances 0.000 claims description 14
- 238000005260 corrosion Methods 0.000 claims description 10
- 239000012717 electrostatic precipitator Substances 0.000 claims description 10
- 235000003599 food sweetener Nutrition 0.000 claims description 10
- 239000003765 sweetening agent Substances 0.000 claims description 10
- 230000003009 desulfurizing effect Effects 0.000 claims description 9
- 238000005352 clarification Methods 0.000 claims description 6
- 238000005192 partition Methods 0.000 claims description 6
- 239000000779 smoke Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 claims 4
- 230000000694 effects Effects 0.000 abstract description 6
- 150000003568 thioethers Chemical class 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 239000000243 solution Substances 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000006872 improvement Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 3
- 239000005864 Sulphur Substances 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- UEZVMMHDMIWARA-UHFFFAOYSA-N Metaphosphoric acid Chemical compound OP(=O)=O UEZVMMHDMIWARA-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 125000001741 organic sulfur group Chemical group 0.000 description 1
- 230000001699 photocatalysis Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
-
- 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
- B01D53/86—Catalytic processes
- B01D53/8603—Removing sulfur compounds
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
-
- 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
- B01D2258/0283—Flue gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/10—Nitrogen; Compounds thereof
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical 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)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Treating Waste Gases (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention discloses a yellow phosphorus tail gas boiler flue gas purification system, which is used for purifying yellow phosphorus electric furnace tail gas and boiler combustion flue gas when the yellow phosphorus tail gas is used as boiler fuel gas, and relates to the field of yellow phosphorus tail gas purification; the denitration system is connected with the outlet of the desulfurization system, is circularly connected with the boiler and is used for inhibiting NO in the heat exchange process of the tail gas combustion process and the boilerxAnd (4) generating. The yellow phosphorus tail gas boiler flue gas purification system can effectively remove sulfides in yellow phosphorus tail gas and inhibit NO in the tail gas combustion and boiler heat exchange processesxThe heat energy of the yellow phosphorus tail gas is effectively utilized while the environmental protection requirement is met, the comprehensive utilization rate of the heat energy of the tail gas is improved, and the effect of reducing the purification cost of the yellow phosphorus tail gas is achieved.
Description
Technical Field
The invention relates to the field of yellow phosphorus tail gas purification, in particular to a yellow phosphorus tail gas boiler flue gas purification system and a yellow phosphorus tail gas boiler flue gas purification method.
Background
At present, the electric furnace method is mainly adopted for yellow phosphorus production in China, and in order to save the heat energy of high-temperature yellow phosphorus tail gas, a production unit often uses the yellow phosphorus tail gas produced by an electric furnace as boiler fuel gas. In the combustion process of using the yellow phosphorus tail gas as the fuel gas of the boiler, in order to ensure that the boiler flue gas after combustion meets the environmental protection requirement, sulfide and NO in the yellow phosphorus tail gas combustion boiler flue gas need to be treatedxAnd (5) performing purification removal treatment.
The tail gas purification device containing desulfurization and denitration in the conventional boiler system usually removes sulfides in the tail gas by using equipment such as water washing, alkali washing and the like to remove NO in the flue gasxAdopt and use ammonia process and SCR denitration in the stove, nevertheless because following reason, the tail gas cleanup unit of conventional desulfurization, denitration is difficult to directly purify the flue gas that yellow phosphorus tail gas combustion boiler produced and is handled up to standard, satisfies the environmental protection requirement:
1. the common desulphurization device can only purify SO2Inorganic sulfur such as gas has no purification effect on organic sulfur in complex compounds, and is easy to react to generate other sulfides in the subsequent process to cause secondary pollution.
2. In generalThe desulfurization device carries out desulfurization by using water washing and alkali washing; in general, a denitration device uses urea, ammonia water, SCR (selective catalytic reduction) and the like to denitrate in a furnace, smoke contacts with water in corresponding processes and generates a large amount of water in reaction, and yellow phosphorus smoke contains a large amount of HF and PH3、SO2、P2O5And the gases generate acidic substances such as hydrofluoric acid, sulfuric acid, sulfurous acid, phosphoric acid, metaphosphoric acid and the like after meeting water, and the acidic substances can generate serious electrochemical corrosion on boilers, smoke and air pipelines, induced draft fans and the like.
3. General desulfurization, denitrification facility all sets up at the boiler exit end, purify the flue gas that discharges after the combustion apparatus burning, boiler heat transfer to fuel, through boiler heat transfer earlier, back flue gas purification's traditional approach, but in yellow phosphorus production, because contain a large amount of acid gas in the yellow phosphorus tail gas, adopt this traditional approach can cause boiler heat transfer component to receive the erosion of acid in the flue gas, cause the damage, influence the continuous steady operation of boiler, form the volume of sulphur flue gas volume great increase before simultaneously after the tail gas burning, cause the treatment cost to rise.
In order to solve the problems, related research documents aiming at the yellow phosphorus tail gas catalytic desulfurization method appear in recent years, but the catalytic desulfurization and denitrification method in the prior art is complex in process, high in cost and difficult to implement in practical application; meanwhile, the method aims to purify CO in the tail gas and use the purified CO as the raw material gas of the carbon-chemical industry, only chemical energy of the CO can be used, the purification cost of the method for treating the tail gas is far higher than the economic value of using the tail gas as fuel gas, and the method cannot be applied to the field of comprehensive utilization of heat energy of the yellow phosphorus tail gas.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a yellow phosphorus tail gas boiler flue gas purification system and a purification method, which can effectively reduce the purification cost of the yellow phosphorus tail gas boiler flue gas while ensuring the purification and removal effects of sulfides and NOx in the yellow phosphorus tail gas.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a yellow phosphorus tail gas boiler flue gas purification system is used for purifying yellow phosphorus electric furnace tail gas and boiler combustion flue gas when the yellow phosphorus tail gas is used as boiler fuel gas, and comprises a desulfurization system and a denitration system, wherein the desulfurization system is arranged between a boiler and a yellow phosphorus electric furnace and is used for desulfurizing the yellow phosphorus electric furnace tail gas; the inlet of the denitration system is connected with the outlet of the desulfurization system, and the denitration system is circularly connected with the boiler and used for inhibiting NO in the heat exchange process between the tail gas combustion process and the boilerxAnd (4) generating.
On the basis of the technical scheme, the desulfurization system comprises a tail gas fan, a desulfurization device and a droplet catcher which are connected in sequence;
the denitration system comprises a low-nitrogen combustion device, a flue gas recirculation device, a waste heat recovery device, an induced draft fan and a chimney which are connected in sequence;
the flue gas recirculation device comprises a secondary fan and a primary fan which are connected in sequence, wherein an air inlet of the secondary fan is connected with a pipeline at a flue gas outlet of the boiler, the secondary fan and the boiler form a circulating flue gas passage, and an air outlet of the secondary fan is also communicated with an air inlet of the primary fan; and the air outlet of the primary air fan is connected with the low-nitrogen combustion device.
On the basis of the technical scheme, the low-nitrogen combustion device is a low-nitrogen combustor.
On the basis of the technical scheme, the desulfurization device comprises a desulfurization tower, a pregnant solution tank, a regeneration pump, a desulfurization pump, a barren solution tank, a dosing tank and an injection regeneration tank which are sequentially connected, wherein the pregnant solution tank is communicated with the dosing tank, the desulfurization pump is connected with the top of the desulfurization tower, a liquid level regulator is arranged between the injection regeneration tank and the barren solution tank, an ejector is arranged at the top of the injection regeneration tank, and the outlet of the regeneration pump is connected with the ejector.
On the basis of the technical scheme, the desulfurizing tower comprises a tower body, a demister, a photocatalyst partition plate and an anti-corrosion ultraviolet lamp, wherein the demister, the photocatalyst partition plate and the anti-corrosion ultraviolet lamp are fixed on the tower body, the demister and the photocatalyst partition plate are loaded with the desulfurization photocatalyst, and the anti-corrosion ultraviolet lamp can irradiate the desulfurization photocatalyst.
On above-mentioned technical scheme's basis, still include tail gas deep purification equipment, tail gas deep purification equipment includes electrostatic precipitator device, dephosphorization device, smart sweetener, electrostatic precipitator device, dephosphorization device, smart sweetener are connected in order, tail gas deep purification equipment is located between desulphurization unit and the drip catcher.
The invention also provides a purification method based on the yellow phosphorus tail gas boiler flue gas purification system, which comprises the following steps:
s1, arranging a desulfurization system between the boiler and the yellow phosphorus electric furnace, arranging a denitration system at the outlet of the desulfurization system, and adding a desulfurization photocatalyst into the desulfurization system;
s2, introducing the tail gas of the yellow phosphorus electric furnace into the desulfurization system, introducing the tail gas treated by the desulfurization system into a denitration system, and circularly connecting the denitration system with a boiler, namely directly connecting the denitration system with the boiler through a low-nitrogen combustion device, wherein the tail gas combusted by the low-nitrogen combustion device releases heat and forms high-temperature flue gas to exchange heat in the boiler, and a part of the flue gas led out by the boiler is introduced into a flue gas recirculation device through a circulation pipeline;
s3, introducing the flue gas treated by the denitration system into a waste heat recovery device, and then discharging the flue gas after the flue gas is introduced into a chimney through a draught fan.
On the basis of the technical scheme, the desulfurization system comprises a tail gas fan, a desulfurization device and a droplet catcher which are connected in sequence;
the denitration system comprises a low-nitrogen combustion device, a flue gas recirculation device, a waste heat recovery device, an induced draft fan and a chimney which are connected in sequence; the flue gas recirculation device comprises a secondary fan and a primary fan which are sequentially connected, wherein an air inlet of the secondary fan is connected with a pipeline at a flue gas outlet of the boiler, and an air outlet of the secondary fan is also communicated with an air inlet of the primary fan; and the air outlet of the primary air fan is connected with the low-nitrogen combustion device.
In the step S2, the tail gas of the yellow phosphorus electric furnace sequentially passes through a tail gas fan, a desulphurization device and a droplet catcher, then is introduced into a low-nitrogen combustion device for combustion, releases heat and forms high-temperature flue gas, and a part of the flue gas led out from the boiler sequentially passes through a secondary fan, a primary fan and enters the boiler and the low-nitrogen combustor to form flue gas circulation; and the other part of the smoke gas led out from the boiler is discharged after passing through a waste heat recovery device, a draught fan and a chimney in sequence.
On the basis of above-mentioned technical scheme, the boiler with set up the deep clarification plant of tail gas between the yellow phosphorus electric stove, the deep clarification plant of tail gas includes electrostatic precipitator device, dephosphorization device, smart sweetener, electrostatic precipitator device, dephosphorization device, smart sweetener are connected in order, the deep clarification plant of tail gas is located between desulphurization unit and the drip catcher.
Compared with the prior art, the invention has the advantages that:
(1) the yellow phosphorus tail gas boiler flue gas purification system can effectively and organically combine the tail gas purification device with the tail gas heat energy recovery system, and can ensure that sulfides in the yellow phosphorus tail gas can be effectively removed, and NO in the processes of tail gas combustion and boiler heat exchange is inhibitedxThe heat energy of the yellow phosphorus tail gas is effectively utilized while the environmental protection requirement is met, and the effect of reducing the purification cost of the yellow phosphorus tail gas is achieved.
(2) The yellow phosphorus tail gas boiler flue gas purification system can be used for carrying out desulfurization treatment on yellow phosphorus tail gas before boiler combustion, compared with the traditional method for desulfurizing flue gas produced after tail gas combustion, the volume of the treated gas is reduced by more than 80%, the volume and the material cost of a desulfurization device are reduced, and the total cost of yellow phosphorus tail gas treatment is further reduced.
(3) The yellow phosphorus tail gas boiler flue gas purification system and the purification method can respectively treat yellow phosphorus tail gas before boiler combustion and yellow phosphorus flue gas after tail gas combustion, and respectively remove sulfide by photocatalyst catalysis and remove NO by a low-nitrogen combustorxThe method has the advantages that the tail gas is purified, the contact between the yellow phosphorus tail gas and water is avoided in the whole process, and the corrosion of gas to the boiler in the yellow phosphorus tail gas purification and heat energy utilization processes is reduced.
(4) The yellow phosphorus tail gas of the inventionThe boiler flue gas purification system is arranged by a low-nitrogen combustor, a flue gas recirculation device and the like which surround the boiler to form a flue gas circulation pipeline, high-temperature flue gas can be repeatedly subjected to low-nitrogen combustion, and the heat efficiency and NO are improved while the heat source is repeatedly utilizedxThe removal rate of the catalyst further reduces the overall cost of the yellow phosphorus tail gas treatment.
(5) The high-temperature flue gas discharged by the boiler in the yellow phosphorus tail gas boiler flue gas purification system is subjected to heat energy recovery by the waste heat recovery device, and the recovered heat is used for production, so that the comprehensive utilization rate of the heat energy of the tail gas is improved.
Drawings
FIG. 1 is a schematic structural diagram of a flue gas purification system of a yellow phosphorus tail gas boiler in an embodiment of the present invention;
FIG. 2 is a diagram of the apparatus of the sulfur removal system for flue gas of a yellow phosphorus tail gas boiler in the embodiment of the present invention.
The system comprises a desulfurizing tower 1, a droplet catcher 2, a pregnant solution tank 3, a regeneration pump 4, a desulfurizing pump 5, a barren solution tank 6, a dosing tank 7, a dosing pump 8, a liquid level regulator 10, an ejector 11, an ejection regeneration tank 12 and an anti-corrosion ultraviolet lamp 13.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1, an embodiment of the present invention provides a yellow phosphorus tail gas boiler flue gas purification system, which is used for purifying yellow phosphorus electric furnace tail gas and boiler combustion flue gas when the yellow phosphorus tail gas is used as a boiler fuel gas, and includes a desulfurization system and a denitration system, wherein the desulfurization system is arranged between a boiler and a yellow phosphorus electric furnace, and is used for desulfurizing the yellow phosphorus electric furnace tail gas; the inlet of the denitration system is connected with the outlet of the desulfurization system, and the denitration system is circularly connected with the boiler and used for inhibiting NO in the heat exchange process between the tail gas combustion process and the boilerxAnd (4) generating.
The denitration system is circularly connected with the boiler, namely the connecting pipeline of the denitration system and the boiler comprises at least one circulating loop, the air inlet and the air outlet of the boiler are both connected to a device in the denitration system, and part of flue gas led out from the air outlet of the boiler can pass through the circulating loop in the denitration system and then returns to the boiler through the air inlet of the boiler for heat exchange again. As in the present example, the boiler-overfire air-boiler forms the first circulation loop, and the boiler-overfire air-once air-low nitrogen burner-boiler forms the second circulation loop.
Wherein, the desulfurization system can be provided with a tail gas fan, a desulfurization device and a drop catcher which are connected in sequence; the denitration system can be a low-nitrogen combustion device, a flue gas recirculation device, a waste heat recovery device, an induced draft fan and a chimney which are connected in sequence; the flue gas recirculation device comprises a secondary fan and a primary fan which are connected in sequence, wherein an air inlet of the secondary fan is connected with a pipeline at a flue gas outlet of the boiler, the secondary fan and the boiler form a circulating flue gas passage, and an air outlet of the secondary fan is also communicated with the air inlet of the primary fan; the air outlet of the primary air fan is connected with the low-nitrogen combustion device.
The low-nitrogen combustion device can be arranged as a low-nitrogen burner which can realize the processes of ensuring stable ignition combustion of fuel and complete combustion of fuel and can inhibit NO in the combustion processxThe amount of production of (c). The low-nitrogen burner described in the present patent application document corresponds to the one described in the "burner for burning yellow phosphorus off-gas" that was a previous chinese patent application by the present company.
Preferably, as shown in fig. 2, the desulfurization device may be configured as a desulfurization tower, a rich solution tank, a regeneration pump, a desulfurization pump, a lean solution tank, a dosing tank and a spray regeneration tank which are connected in sequence, and the bottom of the rich solution tank is communicated with the dosing tank, the desulfurization pump is connected with the top of the desulfurization tower, a liquid level regulator is arranged between the spray regeneration tank and the lean solution tank, an ejector is arranged at the top of the spray regeneration tank, and the outlet of the regeneration pump is connected with the ejector.
The desulfurizing tower includes tower body, defroster, photocatalyst baffle and anticorrosion ultraviolet lamp, and defroster, photocatalyst baffle and anticorrosion ultraviolet lamp are fixed on the tower body, and defroster, photocatalyst baffle carry the sulphur removal photocatalyst, and the sulphur removal photocatalyst of placing on the photocatalyst baffle can be shone to the anticorrosion ultraviolet lamp.
Can set up tail gas deep purification equipment between yellow phosphorus electric stove and tail gas boiler, tail gas deep purification equipment includes electrostatic precipitator, dephosphorization device, smart sweetener, and electrostatic precipitator, dephosphorization device, smart sweetener are connected in order, and tail gas deep purification equipment is located between desulphurization unit and the drip catcher, further promotes yellow phosphorus electric stove tail gas clean-up treatment effect.
The embodiment of the invention also provides a yellow phosphorus tail gas boiler flue gas purification method based on the yellow phosphorus tail gas boiler flue gas purification system, which comprises the following steps:
s1, arranging a desulfurization system between the boiler and the yellow phosphorus electric furnace, arranging a denitration system at the outlet of the desulfurization system and the flue gas outlet of the boiler, and adding a desulfurization photocatalyst into the desulfurization system;
s2, introducing the tail gas of the yellow phosphorus electric furnace into a desulfurization system, introducing the tail gas treated by the desulfurization system into a denitration system, and circularly connecting the denitration system with a boiler, wherein the specific connection mode is that the tail gas is directly connected with the boiler through a low-nitrogen combustion device, the tail gas is combusted by the low-nitrogen combustion device, heat is released and high-temperature flue gas is formed for heat exchange in the boiler, and a part of the flue gas discharged from the boiler is introduced into a flue gas recirculation device through a recirculation device;
s3, carrying out secondary heat recovery on the high-temperature flue gas discharged by the boiler after the denitration system is processed, and then carrying out secondary heat recovery on the high-temperature flue gas by the waste heat recovery device, wherein the recovered heat is used for production, so that the comprehensive utilization rate of the energy tail gas heat energy is improved.
S4, introducing the flue gas treated by the denitration system into a waste heat recovery device for secondary heat recovery, and then draining the flue gas to finally discharge the flue gas into a chimney.
In step S2, the method for purifying yellow phosphorus tail gas and boiler flue gas can be further adapted and adjusted according to the improvement and setting mode of the actual device, for example, the yellow phosphorus electric furnace tail gas is led into a low-nitrogen combustion device for combustion after sequentially passing through a tail gas fan, a desulfurizing tower and a droplet catcher, heat is released and high-temperature flue gas is formed, and a part of the flue gas led out from the boiler sequentially passes through a secondary fan, a primary fan and enters the boiler and the low-nitrogen combustor to form circulation; and the other part of the smoke gas led out from the boiler is discharged after passing through a waste heat recovery device, a draught fan and a chimney in sequence. Thus, sulfide removal and NO suppression by low-nitrogen burners can be achieved by photocatalytic removal using a photocatalyst, respectivelyxMode of generation of tail gasThe purification treatment avoids the contact of the yellow phosphorus tail gas and water in the whole process, and reduces the corrosion of gas to the boiler in the purification and heat energy utilization processes of the yellow phosphorus tail gas.
In this embodiment, the improvement of the above apparatus is to install a deep purification apparatus for tail gas between the yellow phosphorus electric furnace and the tail gas boiler. The tail gas deep purification equipment comprises an electrostatic dust removal device, a dephosphorization device and fine desulfurization equipment, wherein the electrostatic dust removal device, the dephosphorization device and the fine desulfurization equipment are sequentially connected, and the tail gas deep purification equipment is positioned between the desulfurization device and the drop catcher. Therefore, in step S2 of the method for purifying flue gas of a yellow phosphorus tail gas boiler in this embodiment, the tail gas of the yellow phosphorus electric furnace is sequentially passed through the electrostatic dust removal device, the dephosphorization device, and the fine desulfurization device, so as to achieve the purpose of further enhancing the tail gas purification effect. Similarly, other reasonable step modifications according to system device changes are included in the protection scope of the present invention.
In the process of carrying out yellow phosphorus tail gas and tail gas combustion boiler flue gas by the yellow phosphorus tail gas boiler flue gas purification system provided by the embodiment of the invention, the tail gas generated by the yellow phosphorus electric furnace is subjected to the treatment process of desulfurization, low-nitrogen combustion, boiler heat exchange, denitration and waste heat recovery, so that the comprehensive utilization rate of heat energy of the yellow phosphorus tail gas is effectively improved, and compared with the traditional process for carrying out desulfurization on the flue gas generated after tail gas combustion, the process has the advantages that the volume of the treated gas is reduced by more than 80%, the volume of the desulfurization device is greatly reduced, and the material cost is greatly reduced, so that the yellow phosphorus tail gas purification cost is further reduced.
Meanwhile, through the arrangement of the special sulfur removal photocatalyst, the yellow phosphorus tail gas or the combustion flue gas is prevented from being washed by water and washed by alkali, the process flow is shortened, the desulfurization cost is reduced, and meanwhile, the corrosion of the flue gas to the boiler during the heat energy utilization of the yellow phosphorus tail gas is reduced.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (6)
1. The utility model provides a yellow phosphorus tail gas boiler gas cleaning system for yellow phosphorus electric stove tail gas and boiler burning gas cleaning when yellow phosphorus tail gas is used as boiler fuel gas handles its characterized in that: the system comprises a desulfurization system and a denitration system, wherein the desulfurization system is arranged between the boiler and the yellow phosphorus electric furnace and is used for desulfurizing the tail gas of the yellow phosphorus electric furnace; the inlet of the denitration system is connected with the outlet of the desulfurization system, and the denitration system is circularly connected with the boiler and used for inhibiting NO in the heat exchange process between the tail gas combustion process and the boilerxGenerating;
the desulfurization system comprises a desulfurization tower, a pregnant solution tank, a regeneration pump, a desulfurization pump, a barren solution tank, a dosing tank and a jet regeneration tank which are connected in sequence, wherein the bottom of the pregnant solution tank is communicated with the dosing tank, the desulfurization pump is connected with the top of the desulfurization tower, a liquid level regulator is arranged between the jet regeneration tank and the barren solution tank, an ejector is arranged at the top of the jet regeneration tank, and the outlet of the regeneration pump is connected with the ejector;
the desulfurization tower comprises a tower body, a demister, a photocatalyst partition plate and an anti-corrosion ultraviolet lamp, wherein the demister, the photocatalyst partition plate and the anti-corrosion ultraviolet lamp are fixed on the tower body, the demister and the photocatalyst partition plate are loaded with a desulfurization photocatalyst, and the anti-corrosion ultraviolet lamp can irradiate the desulfurization photocatalyst; the desulfurization system comprises a tail gas fan, a desulfurization device and a droplet catcher which are connected in sequence;
the denitration system comprises a low-nitrogen combustion device, a flue gas recirculation device, a waste heat recovery device, an induced draft fan and a chimney which are connected in sequence;
the flue gas recirculation device comprises a secondary fan and a primary fan which are sequentially connected, wherein an air inlet of the secondary fan is connected with a pipeline at a flue gas outlet of the boiler, the secondary fan and the boiler form a circulating flue gas passage through a secondary connecting pipeline, and an air outlet of the secondary fan is also communicated with an air inlet of the primary fan; the air outlet of the primary fan is connected with the low-nitrogen combustion device through a primary connecting pipeline;
the flue gas recirculation device is connected to form double circulation, wherein one circulation path directly enters a boiler furnace through a secondary connecting pipeline through the secondary fan, the other circulation path directly enters the primary fan through a branch formed behind the secondary fan, and the primary fan mixes air with flue gas introduced by the secondary fan and then enters the combustor through the primary connecting pipeline.
2. The yellow phosphorus tail gas boiler flue gas purification system of claim 1, wherein: the low-nitrogen combustion device is a low-nitrogen combustor.
3. The yellow phosphorus tail gas boiler flue gas purification system of claim 1, wherein: still include tail gas deep purification equipment, tail gas deep purification equipment includes electrostatic precipitator, dephosphorization device, smart sweetener, electrostatic precipitator, dephosphorization device, smart sweetener are connected in order, tail gas deep purification equipment is located between desulphurization unit and the drip catcher.
4. A cleaning method based on the yellow phosphorus tail gas boiler flue gas cleaning system of any one of claims 1 to 3, characterized by comprising the following steps:
s1, arranging a desulfurization system between the boiler and the yellow phosphorus electric furnace, arranging a denitration system at the outlet of the desulfurization system, and adding a desulfurization photocatalyst into the desulfurization system;
s2, introducing the tail gas of the yellow phosphorus electric furnace into the desulfurization system, introducing the tail gas treated by the desulfurization system into a denitration system, and circularly connecting the denitration system with a boiler, namely, the denitration system is directly connected with the boiler through a low-nitrogen combustion device and a secondary connecting pipeline, the tail gas combusted by the low-nitrogen combustion device releases heat and forms high-temperature flue gas to exchange heat in the boiler, and a part of the flue gas led out by the boiler is introduced into a flue gas recirculation device through a circulation pipeline;
s3, introducing the flue gas treated by the denitration system into a waste heat recovery device, and then discharging the flue gas after the flue gas is introduced into a chimney through a draught fan.
5. The method for purifying the flue gas of the yellow phosphorus tail gas boiler as claimed in claim 4, characterized in that: the desulfurization system comprises a tail gas fan, a desulfurization device and a droplet catcher which are connected in sequence;
the denitration system comprises a low-nitrogen combustion device, a flue gas recirculation device, a waste heat recovery device, an induced draft fan and a chimney which are connected in sequence; the flue gas recirculation device comprises a secondary fan and a primary fan which are sequentially connected, an air inlet of the secondary fan is connected with a flue gas outlet of the boiler through a secondary connecting pipeline, and an air outlet of the secondary fan is also communicated with an air inlet of the primary fan; the air outlet of the primary fan is connected with the low-nitrogen combustion device through a primary connecting pipeline;
in the step S2, the tail gas of the yellow phosphorus electric furnace sequentially passes through a tail gas fan, a desulphurization device and a droplet catcher, then is introduced into a low-nitrogen combustion device for combustion, releases heat and forms high-temperature flue gas, and a part of the flue gas led out from the boiler sequentially passes through a secondary fan, a primary fan and enters the boiler and the low-nitrogen combustor to form flue gas circulation; and the other part of the smoke gas led out from the boiler is discharged after passing through a waste heat recovery device, a draught fan and a chimney in sequence.
6. The method for purifying the flue gas of the yellow phosphorus tail gas boiler as claimed in claim 4, characterized in that: the boiler with set up the dark clarification plant of tail gas between the yellow phosphorus electric stove, the dark clarification plant of tail gas includes electrostatic precipitator device, dephosphorization device, smart sweetener, electrostatic precipitator device, dephosphorization device, smart sweetener are connected in order, the dark clarification plant of tail gas is located between desulphurization unit and the drip catcher.
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| CN109603530A (en) * | 2019-01-03 | 2019-04-12 | 飞潮（无锡）过滤技术有限公司 | A kind of hot exhaust gas is interior to recycle composite purifying process |
| CN111396901A (en) * | 2020-03-26 | 2020-07-10 | 中材节能股份有限公司 | Integrated incineration device capable of realizing pollution-free treatment of yellow phosphorus tail gas and energy recovery |
| CN112377930A (en) * | 2020-10-16 | 2021-02-19 | 雷波凯瑞磷化工有限责任公司 | Method and equipment for reducing nitrogen oxide emission by yellow phosphorus tail gas combustion |
| CN112393229A (en) * | 2020-10-16 | 2021-02-23 | 雷波凯瑞磷化工有限责任公司 | Boiler capable of reducing nitrogen oxide emission during combustion of yellow phosphorus tail gas |
| CN116510497A (en) * | 2023-06-26 | 2023-08-01 | 昆明理工大学 | Method and system for removing sulfur, phosphorus and nitrogen oxides in yellow phosphorus tail gas boiler by using phosphorus ore powder |
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