CN107029532B - Desulfurization and denitrification integrated device and method for flue gas - Google Patents
Desulfurization and denitrification integrated device and method for flue gas Download PDFInfo
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- CN107029532B CN107029532B CN201710361300.6A CN201710361300A CN107029532B CN 107029532 B CN107029532 B CN 107029532B CN 201710361300 A CN201710361300 A CN 201710361300A CN 107029532 B CN107029532 B CN 107029532B
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- desulfurization
- denitrification
- gas
- flue gas
- ozone
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 130
- 230000023556 desulfurization Effects 0.000 title claims abstract description 130
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 94
- 239000003546 flue gas Substances 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 156
- 238000006243 chemical reaction Methods 0.000 claims abstract description 101
- 239000007788 liquid Substances 0.000 claims abstract description 97
- 239000010865 sewage Substances 0.000 claims abstract description 97
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 96
- 238000002156 mixing Methods 0.000 claims abstract description 47
- 230000003647 oxidation Effects 0.000 claims abstract description 43
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 43
- 239000000203 mixture Substances 0.000 claims abstract description 30
- 239000002245 particle Substances 0.000 claims abstract description 21
- 239000007787 solid Substances 0.000 claims abstract description 16
- 238000005507 spraying Methods 0.000 claims abstract description 9
- 230000007246 mechanism Effects 0.000 claims description 43
- 238000003860 storage Methods 0.000 claims description 26
- 238000005520 cutting process Methods 0.000 claims description 23
- 239000000779 smoke Substances 0.000 claims description 18
- 239000007921 spray Substances 0.000 claims description 15
- 239000002893 slag Substances 0.000 claims description 13
- 239000007789 gas Substances 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 9
- 239000003814 drug Substances 0.000 claims description 6
- 229940079593 drug Drugs 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 239000003153 chemical reaction reagent Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 230000009471 action Effects 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000010008 shearing Methods 0.000 abstract description 3
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 24
- 150000003839 salts Chemical class 0.000 description 14
- 239000000126 substance Substances 0.000 description 12
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 10
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 8
- 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 7
- 239000000428 dust Substances 0.000 description 7
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- 230000003009 desulfurizing effect Effects 0.000 description 5
- 229910002651 NO3 Inorganic materials 0.000 description 4
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 4
- ZWWCURLKEXEFQT-UHFFFAOYSA-N dinitrogen pentaoxide Chemical compound [O-][N+](=O)O[N+]([O-])=O ZWWCURLKEXEFQT-UHFFFAOYSA-N 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- 238000010531 catalytic reduction reaction Methods 0.000 description 3
- 238000007667 floating Methods 0.000 description 3
- 239000010440 gypsum Substances 0.000 description 3
- 229910052602 gypsum Inorganic materials 0.000 description 3
- 239000003595 mist Substances 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 239000002910 solid waste Substances 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010894 electron beam technology Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000011859 microparticle Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 description 1
- 235000005979 Citrus limon Nutrition 0.000 description 1
- 244000131522 Citrus pyriformis Species 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 244000061176 Nicotiana tabacum Species 0.000 description 1
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-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
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000011132 calcium sulphate Nutrition 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- YPJKMVATUPSWOH-UHFFFAOYSA-N nitrooxidanyl Chemical compound [O][N+]([O-])=O YPJKMVATUPSWOH-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000001226 reprecipitation Methods 0.000 description 1
- 235000010344 sodium nitrate Nutrition 0.000 description 1
- 239000004317 sodium nitrate Substances 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 229910052979 sodium sulfide Inorganic materials 0.000 description 1
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002351 wastewater 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
- B01D53/75—Multi-step processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/40—Combinations of devices covered by groups B01D45/00 and B01D47/00
-
- 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
- B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
-
- 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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/76—Gas phase processes, e.g. by using aerosols
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/12—Methods and means for introducing reactants
- B01D2259/122—Gaseous reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/12—Methods and means for introducing reactants
- B01D2259/124—Liquid reactants
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biomedical Technology (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Dispersion Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention provides a desulfurization and denitrification integrated device and method for flue gas, wherein the device comprises a flue gas oxidation and gas-liquid mixing system, a desulfurization and denitrification treatment system, a sewage treatment system and an ozone generator, the flue gas is oxidized by mixing the flue gas with ozone, and then the flue gas and the ozone are mixed with water for reaction, and the gas-liquid mixture forms micron-sized gas-liquid mixed particles and microbubbles under the action of shearing force, so that the contact area is increased in the follow-up vortex-step rotation and spraying treatment, solid matters in the flue gas are fully cleaned, the solid matters enter a desulfurization and denitrification reaction tank along with water flow for desulfurization and denitrification treatment, the gaseous matters are discharged, and the sewage after desulfurization and denitrification treatment is further oxidized by the ozone microbubbles so as to reach ultra-clean emission standards. The invention can improve the flue gas desulfurization and denitration efficiency, meet the ultra-clean emission requirement, and realize desulfurization and denitration integrated treatment, thereby saving the production cost.
Description
Technical Field
The invention relates to the technical field of flue gas treatment, in particular to a desulfurization and denitrification integrated device and method for flue gas.
Background
The existing flue gas desulfurization method comprises the following steps: limestone/lime-gypsum method, lemon absorption method, double alkali method, carbide slag-gypsum method, papermaking white mud-gypsum method, active carbon adsorption method, electron beam radiation method, charged dry absorbent spraying method, metal oxide desulfurization method, sodium sulfide desulfurization method, microorganism desulfurization method, etc. The existing flue gas denitration method comprises the following steps: pre-combustion hydrodenitrogenation, pre-combustion washing denitration, combustion middle-low temperature combustion denitration, low-oxygen combustion denitration, low-nitrogen combustion denitration, coal dust concentration separation, flue gas recirculation technology, selective non-catalytic reduction denitration (SNCR), selective catalytic reduction denitration (SCR), activated carbon adsorption, electron beam denitration technology and the like. Most of the existing boilers in China are coal-fired boilers, and the most widely used and mature processes in China are FGD (flue gas desulfurization) denitration technology and Selective Catalytic Reduction (SCR) denitration technology. The technology and the method have the common defects of low desulfurization and denitrification efficiency and can not meet the ultra-clean emission requirements of implementation in China, and meanwhile, in engineering implementation, the methods have the advantages of large occupied area of a regeneration tank and a clarification tank, large investment and high operation cost, and are mostly single desulfurization and denitrification devices, so that repeated construction of equipment is caused. In order to avoid the above problems and improve the desulfurization and denitrification efficiency and meet the ultra-clean emission requirements, an integrated desulfurization and denitrification process technology with high efficiency and low cost is needed.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention aims to provide a desulfurization and denitrification integrated device and method for flue gas, which are used for solving the problems of low flue gas desulfurization and denitrification efficiency, inability to meet ultra-clean emission requirements, and high investment cost and high operation cost caused by separate desulfurization and denitrification.
To achieve the above and other related objects, the present invention provides an integrated desulfurization and denitrification device for flue gas, comprising at least: the flue gas oxidation and gas-liquid mixing system is used for mixing and oxidizing the flue gas and ozone, mixing and reacting with water to form a gas-liquid mixture, and cutting the gas-liquid mixture to form micron-sized gas-liquid mixed particles and microbubbles; the desulfurization and denitrification treatment system is connected with the flue gas oxidation and gas-liquid mixing system and is used for receiving micron-sized gas-liquid mixed particles and microbubbles generated by the flue gas oxidation and gas-liquid mixing system, rotating and spraying the micron-sized gas-liquid mixed particles and microbubbles so as to separate gas from liquid, discharging the gas and carrying out desulfurization and denitrification treatment on the liquid; the sewage treatment system is connected with the desulfurization and denitrification treatment system and is used for receiving sewage generated after desulfurization and denitrification treatment of the desulfurization and denitrification treatment system, mixing ozone with water to generate ozone microbubbles, and carrying out oxidation treatment on the sewage by utilizing the ozone microbubbles; and the ozone generator is connected with the flue gas oxidation and gas-liquid mixing system and the sewage treatment system and is used for generating ozone and supplying the ozone to the flue gas oxidation and gas-liquid mixing system and the sewage treatment system.
Preferably, the sewage treatment system is further used for supplying treated water to the flue gas oxidation and gas-liquid mixing system and the desulfurization and denitrification treatment system.
Preferably, the flue gas oxidation and gas-liquid mixing system comprises an induced draft fan, a flue, a high-pressure water pump, a flue inlet nozzle, a flue box, a rotating mechanism, a cutting blade and a high-pressure water pipe, wherein the induced draft fan is used for introducing flue gas, one end of the flue box is connected with the induced draft fan and an ozone generator, the other end of the flue box is connected with the flue box, the interior of the flue box is of a cavity structure, the high-pressure water pipe penetrates through the interior cavity of the flue box, the inlet end of the high-pressure water pipe is connected with the high-pressure water pump, the outlet end of the high-pressure water pipe is connected with the desulfurization and denitrification processing system, the flue inlet nozzle is positioned in the interior cavity of the flue box, one end of the high-pressure water pipe is communicated with the interior cavity of the flue box, the other end of the high-pressure water pipe is communicated with the pipe cavity of the high-pressure water pipe, the rotating mechanism and the cutting blade are both positioned in the pipe cavity of the high-pressure water pipe, and the cutting blade is arranged on the outer side surface of the rotating mechanism, and the cutting blade rotates under the driving of the rotating mechanism to cut gas-liquid mixture into micron-level gas-liquid mixture and micro-bubbles.
Preferably, the flue gas oxidation and gas-liquid mixing system further comprises a driving mechanism, wherein the driving mechanism is connected to the rotating mechanism and is used for driving the rotating mechanism to drive the cutting blade to rotate.
Preferably, the desulfurization and denitrification treatment system comprises a vortex-stage cyclone grid, a chimney, a nozzle, a spray water pump and a desulfurization and denitrification reaction tank, wherein the vortex-stage cyclone grid is positioned above the desulfurization and denitrification reaction tank, the inlet end of the vortex-stage cyclone grid is connected with the outlet end of the high-pressure water pipe, the outlet end of the vortex-stage cyclone grid is led to the desulfurization and denitrification reaction tank, the lower end of the chimney is positioned in the desulfurization and denitrification reaction tank, the upper end of the chimney extends out of the desulfurization and denitrification reaction tank, and the nozzle is positioned in the chimney and at the lower end of the chimney and is connected with the spray water pump.
Preferably, the vortex-stage swirl grating is formed by a plurality of rows of grating structures, and the gap between the two rows of grating structures is an inlet.
Preferably, a reagent for desulfurization and denitrification is added into the desulfurization and denitrification reaction tank.
Preferably, the desulfurization and denitrification treatment system further comprises a dosing guide pipe, a dosing mechanism, a dosing tank, a pH sensor and a pH control unit, wherein the dosing guide pipe is connected with the desulfurization and denitrification reaction tank and the dosing mechanism, the dosing tank is connected with the dosing mechanism, and the pH sensor is positioned in the desulfurization and denitrification reaction tank and is connected with the pH control unit, and the pH control unit is further connected with the dosing mechanism.
Preferably, the sewage treatment system comprises a sewage treatment reaction tank, a sewage conduit, two circulating conduits, a filter, a water storage tank, a water pump, an ozone microbubble reaction tank, a sewage draining tank and a slag extractor, wherein the sewage conduit is connected with the sewage treatment reaction tank and the water storage tank, the filter is connected with the sewage treatment reaction tank and the water storage tank and is used for filtering water treated by the sewage treatment reaction tank and storing the filtered water in the water storage tank, the water storage tank is respectively connected with the spraying water pump and the high-pressure water pump through the two circulating conduits and is used for supplying water to the spraying water pump and the high-pressure water pump, the water pump is connected with the water storage tank, the ozone generator and the ozone microbubble reaction tank and is used for mixing and pumping the water in the water storage tank with ozone generated by the ozone generator to generate ozone microbubbles, the ozone microbubble reaction tank is also connected with the sewage treatment reaction tank and is used for conveying the generated ozone microbubbles to the sewage treatment reaction tank for carrying out sewage treatment, and the slag removing slag extractor is connected with the sewage treatment reaction tank and the slag extractor and is used for discharging the sewage treated materials from the sewage treatment reaction tank and the sewage treatment reaction tank.
In order to achieve the above and other related objects, the present invention provides a method for desulfurizing and denitrating flue gas by using the integrated desulfurization and denitrating device for flue gas, comprising the following steps: 1) Introducing the flue gas and ozone generated by an ozone generator into a flue gas oxidation and gas-liquid mixing system for mixed oxidation, then mixing the flue gas and the ozone with water for reaction to form a gas-liquid mixture, and performing cutting treatment on the gas-liquid mixture to form micron-sized gas-liquid mixed particles and microbubbles; 2) Introducing micron-sized gas-liquid mixed particles and microbubbles into a desulfurization and denitrification treatment system, and carrying out rotation and spraying treatment on the gas-liquid mixed particles and microbubbles so as to separate the gas from the liquid, discharging the gas, and carrying out desulfurization and denitrification treatment on the liquid; 3) Introducing the sewage generated after desulfurization and denitrification treatment of the desulfurization and denitrification treatment system into a sewage treatment system, mixing ozone and water to generate ozone microbubbles, and introducing the ozone microbubbles into the sewage treatment system to treat the sewage.
As described above, the integrated device and method for desulfurizing and denitrating flue gas have the following beneficial effects: according to the invention, the flue gas and ozone are mixed to realize oxidation of the flue gas, and then the mixture is mixed with water to react, and the gas-liquid mixture forms micron-sized gas-liquid mixed particles and microbubbles under the action of shearing force, so that the contact area is increased in subsequent vortex-step rotation and spray treatment, solid matters in the flue gas are sufficiently cleaned, the solid matters enter a desulfurization and denitrification reaction tank along with water flow to carry out desulfurization and denitrification treatment, gaseous matters are discharged, and sewage after desulfurization and denitrification treatment is further subjected to oxidation treatment through ozone microbubbles, so that the ultra-clean emission standard is reached. The invention can improve the flue gas desulfurization and denitration efficiency, meet the ultra-clean emission requirement, and realize desulfurization and denitration integrated treatment, thereby saving the production cost.
Drawings
Fig. 1 shows a schematic diagram of the device structure and the process flow of the integrated device and the method for desulfurizing and denitrating flue gas.
Description of element reference numerals
1. Flue gas oxidation and gas-liquid mixing system
11. Draught fan
12. Flue duct
13. High-pressure water pump
14. Tobacco inlet nozzle
15. Smoke box
16. Rotary mechanism
17. Cutting blade
18. High-pressure water pipe
19. Driving mechanism
2. Desulfurization and denitrification treatment system
21. Vortex-stage swirl flow grid
22. Chimney
23. Nozzle
24. Spray water pump
25. Desulfurization and denitrification reaction tank
26. Dosing catheter
27. Dosing mechanism
28. Medicine storage pot
29 PH sensor
20 PH control unit
3. Sewage treatment system
31. Sewage treatment reaction tank
32. Sewage conduit
33. Circulation catheter
34. Filter device
35. Water storage tank
36. Water pump
37. Ozone microbubble reaction tank
38. Pollution discharge tank
39. Slag extractor
4. Ozone generator
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.
Please refer to fig. 1. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the invention, are not intended to be critical to the essential characteristics of the invention, but are intended to fall within the spirit and scope of the invention. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.
As shown in fig. 1, the invention provides an integrated desulfurization and denitrification device and method for flue gas, wherein the device comprises: the flue gas oxidation and gas-liquid mixing system 1 is used for mixing and oxidizing flue gas and ozone, mixing and reacting the mixture with water to form a gas-liquid mixture, and cutting the gas-liquid mixture to form micron-sized gas-liquid mixed particles and microbubbles; the desulfurization and denitrification treatment system 2 is connected with the flue gas oxidation and gas-liquid mixing system 1 and is used for receiving micron-sized gas-liquid mixed particles and micro-bubbles generated by the flue gas oxidation and gas-liquid mixing system 1, rotating and spraying the micron-sized gas-liquid mixed particles and micro-bubbles so as to separate gas from liquid, discharging the gas and carrying out desulfurization and denitrification treatment on the liquid; the sewage treatment system 3 is connected with the desulfurization and denitrification treatment system 2 and is used for receiving sewage generated after desulfurization and denitrification treatment of the desulfurization and denitrification treatment system 2, mixing ozone with water to generate ozone microbubbles, and carrying out oxidation treatment on the sewage by utilizing the ozone microbubbles; an ozone generator 4 connected to the flue gas oxidation and gas-liquid mixing system 1 and the sewage treatment system 3 for generating ozone and supplying ozone to the flue gas oxidation and gas-liquid mixing system 1 and the sewage treatment system 3.
As shown in fig. 1, the sewage treatment system 3 is further used for supplying treated water to the flue gas oxidation and gas-liquid mixing system 1 and the desulfurization and denitrification treatment system 2 so as to realize recycling water and save energy. Of course, when the sewage treatment system 3 cannot meet the requirement of the water consumption of the flue gas oxidation and gas-liquid mixing system 1 and the desulfurization and denitrification treatment system 2, the water consumption of the flue gas oxidation and gas-liquid mixing system 1 and the desulfurization and denitrification treatment system 2 needs to be additionally supplied by other modes so as to meet the requirement of flue gas treatment.
The flue gas oxidation and gas-liquid mixing system 1 comprises a draught fan 11, a flue 12, a high-pressure water pump 13, a flue inlet nozzle 14, a flue box 15, a rotary mechanism 16, a cutting blade 17 and a high-pressure water pipe 18, wherein the draught fan 11 is used for introducing flue gas, one end of the flue 12 is connected with the draught fan 11 and an ozone generator 4, the other end of the flue 12 is connected with the flue box 15, the interior of the flue box 15 is of a cavity structure, the high-pressure water pipe 18 penetrates through the interior cavity of the flue box 15, the inlet end of the high-pressure water pipe 18 is connected with the high-pressure water pump 13, the outlet end of the high-pressure water pipe is connected with the desulfurization and denitrification processing system 2, the flue inlet nozzle 14 is positioned in the interior cavity of the flue box 15, one end of the high-pressure water pipe 14 is communicated with the interior cavity of the flue box 15, the other end of the high-pressure water pipe 18 is communicated with the pipe cavity of the high-pressure water pipe 18, the ozone generator 4 has the functions of generating ozone and supplying ozone, preferably, the ozone is arranged in the ozone generator 4, the flue gas and the flue box 15 are mixed and oxidized, the high-pressure water pump 13 pumps water into the high-pressure water pipe 18 and flows through the flue box 15 at a high speed to form a high-speed water column, the flue 15 is sucked into the flue box 15 through the high-pressure water column through the high-pressure water inlet nozzle 14 under the action of the high-pressure water inlet nozzle 14, and the high-pressure water flow state is sucked into the flue box 15 through the high-pressure water pipe through the nozzle 15In the tube 18, the ozone is mixed with the flue gas to oxidize nitric oxide in the flue gas into water-soluble nitrogen dioxide (NO) 2 ) And dinitrogen pentoxide (N) 2 O 5 )，NO 2 And N 2 O 5 Nitrate is generated when meeting water, and sulfur dioxide (SO 2 ) Is partially oxidized to sulfur trioxide (SO) when encountering ozone 3 ) Sulfur dioxide and sulfur trioxide are produced to dilute sulfuric acid (H) 2 SO 4 ). As shown in fig. 1, the smoke inlet nozzles 14 are tubular bodies and are distributed along the periphery of the high-pressure water pipe 18 in the smoke box 15, and the longitudinal center line of the smoke inlet nozzles 14 is preferably at a non-right angle with the longitudinal center line of the high-pressure water pipe 18, so that the smoke and ozone are fully mixed and mixed with the high-pressure water. The rotating mechanism 16 and the cutting blade 17 are both positioned in the pipe cavity of the high-pressure water pipe 18 positioned outside the smoke box 15, the cutting blade 17 is arranged on the outer side surface of the rotating mechanism 16, and the cutting blade 17 is driven by the rotating mechanism 16 to rotate and is used for cutting the gas-liquid mixture into micron-sized gas-liquid mixture and microbubbles. The rotating mechanism 16 is connected with a driving mechanism 19, the rotating mechanism 16 drives the cutting blade 17 to rotate at a high speed under the driving of the driving mechanism 19, and the rotating speed of the cutting blade 17 is controlled by the driving mechanism 19, so that the gas-liquid mixture can be cut into a micron-sized gas-liquid mixture and micro bubbles.
The desulfurization and denitrification treatment system 2 comprises a vortex-stage cyclone grating 21, a chimney 22, a nozzle 23, a spray water pump 24, a desulfurization and denitrification reaction tank 25, a dosing guide pipe 26, a dosing mechanism 27, a drug storage tank 28, a pH sensor 29 and a pH control unit 20, wherein the vortex-stage cyclone grating 21 is positioned above the desulfurization and denitrification reaction tank 25, the inlet end of the vortex-stage cyclone grating is connected with the outlet end of the high-pressure water pipe 18, the outlet end of the vortex-stage cyclone grating is led to the desulfurization and denitrification reaction tank 25, the lower end of the chimney 22 is positioned in the desulfurization and denitrification reaction tank 25, the upper end of the chimney 22 extends out of the desulfurization and denitrification reaction tank 25, and the nozzle 23 is positioned in the chimney 22 and at the lower end of the chimney and is connected with the spray water pump 24. The micron-sized gas-liquid mixture and micro-bubbles are sprayed into a vortex-stage cyclone grid 21 of the desulfurization and denitrification treatment system 2 at high speed through a high-pressure water pipe 18, the vortex-stage cyclone grid 21 is formed by a plurality of rows of grid-shaped structures, and gaps between the two rows of grid-shaped structures are inletsThe high-speed sprayed micron-sized gas-liquid mixture and micro-bubbles have higher speed when entering the vortex-stage cyclone grid 21, and perform rotary motion when touching the grid wall surface to form vortex, rapidly rotate and downwards flush to the upper water surface of the desulfurization and denitrification reaction tank 25, splash micro-particles and bubbles, liquid substances in the micro-particles automatically fall when encountering vaporific liquid sprayed by the upper nozzle 23, and gaseous substances float upwards in a micro-bubble shape to enter the chimney 22 and are discharged, and solid substances such as dust, crystalline salt and the like floating in the liquid substances enter the desulfurization and denitrification reaction tank 25 under the action of gravity. As the gas-liquid mixture particles and bubbles reach the micro-scale or even micro-nano-scale, the contact surface of the gas-liquid mixture particles and bubbles is very large, the contact is very sufficient, the solubility is very high, so that the solid matters in the flue gas are sufficiently cleaned out and fall into the desulfurization and denitrification reaction tank 25, and the aim of ultra-clean discharge of the flue gas is achieved. The desulfurization and denitrification reaction tank 25 is added with an agent for desulfurization and denitrification, which is alkali liquor, such as Ca (OH) 2 Or NaOH, reacts with nitrate to produce Ca (NO) 3 ) 2 Crystalline salt, naNO 3 Crystalline salts, reacting with sulfate to form CaSO 4 Crystalline salt, na 2 SO 4 Crystalline salts, which may also be other organic species capable of reacting with nitrate and sulfate, e.g. NH formation 4 NO 3 Crystalline salts, (NH) 4 ) 2 SO 4 A crystalline salt. The dosing guide pipe 26 is connected to the desulfurization and denitrification reaction tank 25 and the dosing mechanism 27, the dosing mechanism 27 is used for dosing the desulfurization and denitrification reaction tank 25 with a medicament through the dosing guide pipe 26, the medicament storage tank 28 is connected to the dosing mechanism 27, the pH sensor 29 is located in the desulfurization and denitrification reaction tank 25 and connected with the pH control unit 20, and the pH control unit 20 is also connected to the dosing mechanism 27. The pH control unit 20 regulates the dosing amount of the chemical dosing mechanism 27 according to the pH value in the desulfurization and denitrification reaction tank 25 detected by the pH sensor 29 so that the pH value in the desulfurization and denitrification reaction tank 25 is maintained at a predetermined value, preferably, the pH value in the sulfur and denitrification reaction tank 25 is maintained at 7. The emission content of nitrogen oxides can be controlled by controlling the input amount of ozone to the flue gas oxidation and gas-liquid mixing system 1, and SO can be controlled by controlling the input amount of a reagent for desulfurization and denitrification to the sulfur denitration reaction tank 25 2 Is contained in the waste water. The invention can reach the standard of ultra-clean emission value, namely: per cubic meter of discharged flue gas: the dust content is less than 10 mg; sulfur dioxide content less than 30 mg; the nitrogen oxide content is less than 50 mg.
The sewage treatment system 3 comprises a sewage treatment reaction tank 31, a sewage conduit 32, two circulating conduits 33, a filter 34, a water storage tank 35, a water pump 36, an ozone microbubble reaction tank 37, a sewage discharge tank 38 and a slag extractor 39, wherein the sewage conduit 32 is connected with a sewage inlet at the lower end of the sewage treatment reaction tank 31 and a sewage outlet at the bottom end of the desulfurization and denitrification reaction tank 25, is used for introducing sewage containing various solid matters such as crystal salt, dust and the like generated after desulfurization and denitrification treatment in the desulfurization and denitrification reaction tank 25 into the sewage treatment reaction tank 31 for further treatment, the filter 34 is connected with a water outlet at the upper end of the sewage treatment reaction tank 31 and the water storage tank 35, is used for filtering water treated by the sewage treatment reaction tank 31, stores the filtered water in the water storage tank 35, and is respectively connected with a spray water pump 24 and a high-pressure water pump 13 through the two circulating conduits 33, for supplying water to the spray water pump 24 and the high-pressure water pump 13, the water pump 36 is connected with the water storage tank 35, the ozone generator 4 and the ozone microbubble reaction tank 37, for mixing the water in the water storage tank 35 with ozone generated by the ozone generator 4 and pumping the mixture to the ozone microbubble reaction tank 37 to generate ozone microbubbles, the ozone microbubble reaction tank 37 is also connected with the sewage treatment reaction tank 31, for delivering the generated ozone microbubbles to the sewage treatment reaction tank 31 for sewage treatment, the water and the ozone are mixed by the water pump 36 and pumped under the high-pressure pump into the ozone microbubble reaction tank 37 and generate ozone microbubbles, the ozone microbubble reaction tank 37 delivers the ozone microbubbles to the sewage treatment reaction tank 31, the solid-liquid mixture in the sewage treatment reaction tank 31 is subjected to the action of the ozone microbubbles, further oxidation and solid-liquid separation reactions take place. The treated water is discharged from the upper water outlet to the filter 34 for further filtering treatment, the water outlet can adopt an overflow weir structure, solid matters separated from solid and liquid are discharged from the bottom water outlet, the sewage tank 38 is connected to the bottom water outlet of the sewage treatment reaction tank 31 and the slag extractor 39, and is used for receiving the solid matters discharged from the sewage treatment reaction tank 31, and delivering the solid matters to the slag extractor 39 for treatment and then discharging. The sewage outlet of the sewage treatment reaction tank 31 is arranged at the bottom of the tank, dust, crystalline salt and other solid matters flow out from the bottom of the reaction tank 31 and enter the sewage discharge tank 38 to be naturally precipitated, and the precipitated solid waste residues are subjected to filter pressing treatment by the slag extractor 39 and then are transported outwards. The filter 34 is preferably air-floating plate type.
The method for desulfurizing and denitrating the flue gas by adopting the integrated desulfurizing and denitrating device provided by the invention comprises the following steps: the flue gas led from the induced draft fan 11 and the ozone sent from the ozone generator 4 sequentially enter the flue 12 and the flue box 15 for mixed oxidation, and the nitric oxide in the flue gas is oxidized into nitrogen dioxide (NO) which is soluble in water under the action of the ozone 2 ) And dinitrogen pentoxide (N) 2 O 5 ) Sulfur dioxide (SO) in flue gas 2 ) Is partially oxidized to sulfur trioxide SO when encountering ozone 3 Under the impact of high-speed water column pumped by the high-pressure water pump 13, the smoke box 15 is in a negative pressure state, and the mixed smoke in the smoke box 15 is quickly sucked into the high-pressure water pipe 18 through the smoke inlet spray pipe 14, wherein NO in the smoke 2 And N 2 O 5 Nitrate radical and SO are generated when meeting water 2 And SO 3 Dilute sulfuric acid is generated when meeting water. In the high-pressure water pipe 18 penetrating out of the smoke box 15, the gas-liquid mixture is cut into micron-sized gas-liquid mixture and micro-bubbles by the cutting blade 17 rotating at high speed, the micron-sized gas-liquid mixture and the micro-bubbles are quickly sent into the vortex-stage cyclone grid 21 in the desulfurization and denitrification treatment system 2, vortex is formed in the cyclone grid by rotating at high speed to be impacted to the upper water surface of the desulfurization and denitrification reaction tank 25, the gas and the liquid are more fully contacted and mixed, tiny particles and the water bubbles splashed from the upper water surface of the desulfurization and denitrification reaction tank 25 and water mist sprayed from the nozzle 3 collide and explode, micron-sized mixed bubble mist is formed above the desulfurization and denitrification reaction tank 25, gaseous substances escape from the bubble mist and upwards enter the chimney 22 and are discharged to the next treatment process or are emptied, and liquid substances enter the desulfurization and denitrification reaction tank 25 under the action of gravity. The sulfuric acid and the nitric acid in the liquid state react with the chemical agent in the desulfurization and denitrification reaction tank 25 to generate sulfate or nitrate crystal salt, and the crystal salt andthe dust in the liquid state sinks to the bottom of the desulfurization and denitrification reaction tank 25, and is discharged to the sewage treatment reaction tank 31 through the sewage conduit 32. The PH value in the desulfurization and denitrification reaction tank 25 is measured by a PH value sensor 29, the data measured by the PH value sensor 29 is transmitted to a PH value control unit 20, and the PH value control unit 20 controls the dosing amount of the chemical dosing mechanism 27 according to the PH measured value.
The sewage flowing into the sewage treatment reaction tank 31 from the sewage conduit 32 contains dust, calcium sulfate or sodium sulfate or ammonium sulfate crystal salt, calcium nitrate or sodium nitrate or ammonium nitrate crystal salt and other solid wastes, and the sewage treatment reaction tank 31 is filled with ozone microbubbles. Under the action of ozone microbubbles, substances which are not oxidized are further oxidized, solid wastes are rapidly and fully precipitated, all the precipitated solid substances such as dust, crystalline salt and the like are discharged into a sewage disposal tank 38 through a sewage disposal outlet positioned at the bottom of the sewage treatment reaction tank 31, and are then conveyed outside after filter pressing treatment through a slag extractor 39. The treated liquid in the sewage treatment reaction tank 31 floats upwards and enters the filter 34, oily substances and floating substances in the liquid are filtered in the filter 34, the filtered water is led into the water storage tank 35 for reprecipitation, the water in the water storage tank 35 is pumped into the ozone microbubble reaction tank 37 by the water pump 36 together with ozone supplied by the ozone generator 4 to generate ozone microbubbles, the ozone microbubbles are then conveyed into the sewage treatment reaction tank 31 for oxidation treatment of sewage, and on the other hand, water is respectively supplied to the spray water pump 24 and the high-pressure water pump 13 through the two circulating pipes 33 so as to meet the requirements of high-pressure water of the flue gas oxidation and gas-liquid mixing system 1 and spray water of the desulfurization and denitrification treatment system 2, and further realize energy-saving and environment-friendly water.
In summary, the invention realizes the oxidation of the flue gas by mixing the flue gas with ozone, then mixing the flue gas with water for reaction, and forming micron-sized gas-liquid mixed particles and microbubbles by the gas-liquid mixture under the action of shearing force, thereby being beneficial to increasing the contact area in the subsequent vortex-step rotation and spray treatment, leading the solid matters in the flue gas to be fully cleaned out, entering a desulfurization and denitrification reaction tank along with water flow for desulfurization and denitrification treatment, discharging the gaseous matters, and further oxidizing the sewage after desulfurization and denitrification treatment by ozone microbubbles so as to reach the ultra-clean discharge standard. The invention can improve the flue gas desulfurization and denitration efficiency, meet the ultra-clean emission requirement, and realize desulfurization and denitration integrated treatment, thereby saving the production cost.
Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (9)
1. An integrated desulfurization and denitrification device for flue gas, the device comprising at least:
the flue gas oxidation and gas-liquid mixing system (1), wherein the flue gas oxidation and gas-liquid mixing system (1) comprises a flue gas inlet nozzle (14), a flue box (15), a rotating mechanism (16), a cutting blade (17) and a high-pressure water pipe (18), the interior of the flue box (15) is of a cavity structure, and the high-pressure water pipe (18) penetrates through the internal cavity of the flue box (15); the smoke inlet nozzle (14) is positioned in the inner cavity of the smoke box (15), one end of the smoke inlet nozzle is communicated with the inner cavity of the smoke box (15) in an opening way, and the other end of the smoke inlet nozzle is communicated with the pipe cavity of the high-pressure water pipe (18) in an opening way; the flue gas and the ozone are respectively sent into the flue box (15) for mixed oxidation, and the high-pressure water pipe (18) is internally provided with water flow flowing at high speed to enable the flue box (15) to be in a negative pressure state, so that the mixed gas of the flue gas and the ozone is sucked into the high-pressure water pipe (18) to be mixed with the high-speed water flow to form a gas-liquid mixture; the rotary mechanism (16) and the cutting blade (17) are both positioned in a pipe cavity of the high-pressure water pipe (18) positioned outside the smoke box (15), the cutting blade (17) is arranged on the outer side surface of the rotary mechanism (16), and the cutting blade (17) rotates under the drive of the rotary mechanism (16) to cut the gas-liquid mixture into micron-sized gas-liquid mixed particles and microbubbles;
the desulfurization and denitrification treatment system (2) is connected to the high-pressure water pipe (18) of the flue gas oxidation and gas-liquid mixing system (1) and is used for receiving the micron-sized gas-liquid mixed particles and microbubbles, rotating and spraying the micron-sized gas-liquid mixed particles and microbubbles so as to separate gas from liquid, discharging the gas and carrying out desulfurization and denitrification treatment on the liquid; the desulfurization and denitrification treatment system (2) comprises a vortex-stage cyclone grid (21), a chimney (22), a nozzle (23), a spray water pump (24) and a desulfurization and denitrification reaction tank (25), wherein the vortex-stage cyclone grid (21) is positioned above the desulfurization and denitrification reaction tank (25), the inlet end of the vortex-stage cyclone grid is connected with the outlet end of the high-pressure water pipe (18), the outlet end of the vortex-stage cyclone grid is led to the desulfurization and denitrification reaction tank (25), the lower end of the chimney (22) is positioned in the desulfurization and denitrification reaction tank (25), the upper end of the chimney extends out of the desulfurization and denitrification reaction tank (25), and the nozzle (23) is positioned in the chimney (22) and at the lower end of the chimney and is connected with the spray water pump (24);
the sewage treatment system (3) is connected with the desulfurization and denitrification treatment system (2) and is used for receiving sewage generated after desulfurization and denitrification treatment of the desulfurization and denitrification treatment system (2), mixing ozone with water to generate ozone microbubbles, and carrying out oxidation treatment on the sewage by utilizing the ozone microbubbles;
and the ozone generator (4) is connected with the flue gas oxidation and gas-liquid mixing system (1) and the sewage treatment system (3) and is used for generating and supplying ozone to the flue gas oxidation and gas-liquid mixing system (1) and the sewage treatment system (3).
2. The integrated desulfurization and denitrification device for flue gas according to claim 1, wherein: the sewage treatment system (3) is also used for supplying the treated water to the flue gas oxidation and gas-liquid mixing system (1) and the desulfurization and denitrification treatment system (2).
3. The integrated desulfurization and denitrification device for flue gas according to claim 2, wherein: the flue gas oxidation and gas-liquid mixing system (1) further comprises an induced draft fan (11), a flue (12) and a high-pressure water pump (13), wherein the induced draft fan (11) is used for introducing flue gas, one end of the flue (12) is connected with the induced draft fan (11) and the ozone generator (4), the other end of the flue is connected with the flue box (15), and the inlet end of the high-pressure water pipe (18) is connected with the high-pressure water pump (13).
4. The integrated desulfurization and denitrification device for flue gas according to claim 3, wherein: the flue gas oxidation and gas-liquid mixing system (1) further comprises a driving mechanism (19), wherein the driving mechanism (19) is connected to the rotating mechanism (16) and is used for driving the rotating mechanism (16) to drive the cutting blade (17) to rotate.
5. The integrated desulfurization and denitrification device for flue gas according to claim 4, wherein: the vortex-stage swirl grating (21) is formed by a plurality of rows of grating structures, and gaps between the two rows of grating structures are inlets.
6. The integrated desulfurization and denitrification device for flue gas according to claim 5, wherein: the desulfurization and denitrification reaction tank (25) is added with a reagent for desulfurization and denitrification.
7. The integrated desulfurization and denitrification device for flue gas according to claim 6, wherein: the desulfurization and denitrification treatment system (2) further comprises a dosing guide pipe (26), a dosing mechanism (27), a drug storage tank (28), a pH sensor (29) and a pH control unit (20), wherein the dosing guide pipe (26) is connected to the desulfurization and denitrification reaction tank (25) and the dosing mechanism (27), the drug storage tank (28) is connected to the dosing mechanism (27), and the pH sensor (29) is located in the desulfurization and denitrification reaction tank (25) and connected with the pH control unit (20), and the pH control unit (20) is further connected to the dosing mechanism (27).
8. The integrated desulfurization and denitrification device for flue gas according to claim 7, wherein: the sewage treatment system (3) comprises a sewage treatment reaction tank (31), a sewage conduit (32), two circulating conduits (33), a filter (34), a water storage tank (35), a water pump (36), an ozone microbubble reaction tank (37), a pollution discharge tank (38) and a slag extractor (39), wherein the sewage conduit (32) is connected with the sewage treatment reaction tank (31) and the desulfurization and denitrification reaction tank (25), the filter (34) is connected with the sewage treatment reaction tank (31) and the water storage tank (35) for filtering water treated by the sewage treatment reaction tank (31) and storing the filtered water in the water storage tank (35), the water storage tank (35) is connected with the spray water pump (24) and the high-pressure water pump (13) through the two circulating conduits respectively, the water pump (36) is connected with the water storage tank (35), the ozone generator (4) and the ozone microbubble reaction tank (37) for generating ozone bubbles by pumping the ozone in the water storage tank (35) and the ozone microbubble reaction tank (37), the sewage treatment device is used for conveying generated ozone microbubbles into the sewage treatment reaction tank (31) for sewage treatment, and the sewage discharge tank (38) is connected with the sewage treatment reaction tank (31) and the slag extractor (39) and is used for receiving solid matters discharged from the sewage treatment reaction tank (31) and conveying the solid matters to the slag extractor (39) for treatment and then discharging.
9. A method for desulfurization and denitrification using the integrated desulfurization and denitrification device for flue gas according to any one of claims 1 to 8, comprising the steps of:
1) Introducing the flue gas and ozone generated by an ozone generator (4) into a flue gas oxidation and gas-liquid mixing system (1) for mixed oxidation, then mixing the flue gas and the ozone with water for reaction to form a gas-liquid mixture, and cutting the gas-liquid mixture to form micron-sized gas-liquid mixed particles and microbubbles;
2) Introducing micron-sized gas-liquid mixed particles and microbubbles into a desulfurization and denitrification treatment system (2), and carrying out rotation and spraying treatment on the gas-liquid mixed particles and microbubbles so as to separate the gas from the liquid, discharging the gas, and carrying out desulfurization and denitrification treatment on the liquid;
3) Introducing sewage generated after desulfurization and denitrification treatment of the desulfurization and denitrification treatment system (2) into a sewage treatment system (3), mixing ozone and water to generate ozone microbubbles, and introducing the ozone microbubbles into the sewage treatment system (3) to treat the sewage.
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| CN108404616A (en) * | 2018-02-02 | 2018-08-17 | 东华大学 | A kind of wet denitration system and method absorbing flue gas based on ozone oxidation |
| CN108465376B (en) * | 2018-02-02 | 2021-06-04 | 东华大学 | Wet denitration system and method based on air catalytic oxidation absorption of flue gas |
| CN108434967A (en) * | 2018-02-02 | 2018-08-24 | 东华大学 | A kind of wet denitration system and method absorbing flue gas based on air oxidation |
| CN108889070A (en) * | 2018-07-19 | 2018-11-27 | 江苏安纳泰环保科技有限公司 | A kind of chemical emission adsorption tower |
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| CN203916431U (en) * | 2014-05-13 | 2014-11-05 | 浙江天蓝环保技术股份有限公司 | A kind of gaseous oxidation is in conjunction with the flue gas combined desulfurization and denitration device of wet absorption |
| CN205313163U (en) * | 2016-01-18 | 2016-06-15 | 北京国电龙源环保工程有限公司 | Reduce ozone oxidation processing system of COD concentration in organic amine waste water |
| CN205903779U (en) * | 2016-07-27 | 2017-01-25 | 广东惟一水务工程有限公司 | Micro -nano bubbles system of advanced oxidation method exhaust gas purification device |
| CN206965477U (en) * | 2017-05-19 | 2018-02-06 | 安徽未名科键环境有限公司 | A kind of denitration integrated device for flue gas |
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