CN109701373A - A kind of flue gas low-temperature denitration and synchronized desulfuring processing system and its processing method - Google Patents
A kind of flue gas low-temperature denitration and synchronized desulfuring processing system and its processing method Download PDFInfo
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- CN109701373A CN109701373A CN201811651760.3A CN201811651760A CN109701373A CN 109701373 A CN109701373 A CN 109701373A CN 201811651760 A CN201811651760 A CN 201811651760A CN 109701373 A CN109701373 A CN 109701373A
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 239000003546 flue gas Substances 0.000 title claims abstract description 71
- 238000012545 processing Methods 0.000 title claims abstract description 61
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 19
- 238000003672 processing method Methods 0.000 title claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 246
- 239000007921 spray Substances 0.000 claims abstract description 242
- 238000006243 chemical reaction Methods 0.000 claims abstract description 61
- 230000003647 oxidation Effects 0.000 claims abstract description 59
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 53
- 229910001868 water Inorganic materials 0.000 claims abstract description 53
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 51
- 239000007789 gas Substances 0.000 claims abstract description 47
- 239000000779 smoke Substances 0.000 claims abstract description 40
- 239000000126 substance Substances 0.000 claims abstract description 34
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 29
- 239000012530 fluid Substances 0.000 claims abstract description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000012717 electrostatic precipitator Substances 0.000 claims abstract description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 9
- 238000006477 desulfuration reaction Methods 0.000 claims description 53
- 230000023556 desulfurization Effects 0.000 claims description 53
- 230000003197 catalytic effect Effects 0.000 claims description 43
- 239000003513 alkali Substances 0.000 claims description 41
- 239000003814 drug Substances 0.000 claims description 35
- 239000010802 sludge Substances 0.000 claims description 34
- 239000011159 matrix material Substances 0.000 claims description 31
- 238000001914 filtration Methods 0.000 claims description 30
- 238000009826 distribution Methods 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 28
- 238000002425 crystallisation Methods 0.000 claims description 26
- 230000008025 crystallization Effects 0.000 claims description 26
- 238000005189 flocculation Methods 0.000 claims description 25
- 230000016615 flocculation Effects 0.000 claims description 25
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 23
- 238000000746 purification Methods 0.000 claims description 23
- 238000004062 sedimentation Methods 0.000 claims description 22
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 18
- 239000007800 oxidant agent Substances 0.000 claims description 17
- 230000001590 oxidative effect Effects 0.000 claims description 17
- 229920006395 saturated elastomer Polymers 0.000 claims description 15
- 239000003344 environmental pollutant Substances 0.000 claims description 14
- 231100000719 pollutant Toxicity 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 13
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 12
- 229910002651 NO3 Inorganic materials 0.000 claims description 11
- 239000013078 crystal Substances 0.000 claims description 11
- 208000005156 Dehydration Diseases 0.000 claims description 9
- 230000018044 dehydration Effects 0.000 claims description 9
- 238000006297 dehydration reaction Methods 0.000 claims description 9
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 8
- 238000006555 catalytic reaction Methods 0.000 claims description 8
- ZWWCURLKEXEFQT-UHFFFAOYSA-N dinitrogen pentaoxide Chemical compound [O-][N+](=O)O[N+]([O-])=O ZWWCURLKEXEFQT-UHFFFAOYSA-N 0.000 claims description 8
- 239000002699 waste material Substances 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 7
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 7
- 238000010079 rubber tapping Methods 0.000 claims description 7
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 6
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 6
- 239000000920 calcium hydroxide Substances 0.000 claims description 6
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 6
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 6
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 5
- 239000000292 calcium oxide Substances 0.000 claims description 5
- 239000013618 particulate matter Substances 0.000 claims description 5
- HRZFUMHJMZEROT-UHFFFAOYSA-L sodium disulfite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])(=O)=O HRZFUMHJMZEROT-UHFFFAOYSA-L 0.000 claims description 5
- 235000010262 sodium metabisulphite Nutrition 0.000 claims description 5
- 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 claims description 4
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical class OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 claims description 4
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 claims description 4
- 239000011575 calcium Substances 0.000 claims description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 claims description 3
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 3
- 239000011833 salt mixture Substances 0.000 claims description 3
- 239000013049 sediment Substances 0.000 claims description 3
- 235000010265 sodium sulphite Nutrition 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- 239000005708 Sodium hypochlorite Substances 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 239000003517 fume Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 2
- 239000012716 precipitator Substances 0.000 claims description 2
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims description 2
- 239000002562 thickening agent Substances 0.000 claims 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 1
- 238000007210 heterogeneous catalysis Methods 0.000 claims 1
- 239000001301 oxygen Substances 0.000 claims 1
- 229910052760 oxygen Inorganic materials 0.000 claims 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 4
- 239000001569 carbon dioxide Substances 0.000 abstract description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 2
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 abstract description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 27
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 22
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 12
- 230000006872 improvement Effects 0.000 description 9
- 239000000428 dust Substances 0.000 description 8
- 229910021529 ammonia Inorganic materials 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 6
- 239000005864 Sulphur Substances 0.000 description 5
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 5
- 239000006227 byproduct Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 4
- 235000012255 calcium oxide Nutrition 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910002089 NOx Inorganic materials 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- 238000002386 leaching Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 2
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 2
- 235000011130 ammonium sulphate Nutrition 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 235000010216 calcium carbonate Nutrition 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 238000005119 centrifugation Methods 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 2
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 239000010808 liquid waste Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000012855 volatile organic compound Substances 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 238000004056 waste incineration Methods 0.000 description 2
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- BZSXEZOLBIJVQK-UHFFFAOYSA-N 2-methylsulfonylbenzoic acid Chemical compound CS(=O)(=O)C1=CC=CC=C1C(O)=O BZSXEZOLBIJVQK-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 241000790917 Dioxys <bee> Species 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 235000009508 confectionery Nutrition 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- TXKMVPPZCYKFAC-UHFFFAOYSA-N disulfur monoxide Inorganic materials O=S=S TXKMVPPZCYKFAC-UHFFFAOYSA-N 0.000 description 1
- 238000005367 electrostatic precipitation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000003694 hair properties Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 230000029553 photosynthesis Effects 0.000 description 1
- 238000010672 photosynthesis Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 229910052815 sulfur oxide Inorganic materials 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
Abstract
The present invention relates to a kind of flue gas low-temperature denitration and synchronized desulfuring processing systems and its processing method, system includes the electrostatic precipitator being sequentially connected by flue, pretreatment unit, desulfurizing tower, low-temperature denitration reaction tower, wet-type electrocatalytic oxidation tower and air-introduced machine, the first spray equipment is equipped in pretreatment unit, the second spray equipment is equipped in desulfurizing tower, spray liquid inlet and outlet the first spray liquid cyclic processing device of connection of first and second spray equipments, third spray equipment is equipped in low-temperature denitration reaction tower, the spray liquid outlet of third spray equipment connects the inlet of low-temperature denitration reaction tower by spray liquid water inlet pipe, the leakage fluid dram of chemical denitrification tank connects the second spray liquid cyclic processing device by pipeline, second spray liquid cyclic processing device connects the spray liquid entrance of third spray equipment by pipeline.Without spray liquid water outlet when realizing smoke gas treatment using the system, flue gas is converted to non-harmful nitrogen, carbon dioxide and water, without secondary pollution.
Description
Technical field
The present invention relates to waste gas pollution control and treatment technical field more particularly to a kind of flue gas low-temperature denitration and synchronized desulfuring processing systems
And its processing method.
Background technique
It can be generated due to coal-fired fuel or respective reaction in the production of the enterprises such as thermal power generation, metal smelt, chemical engineering
Flue gas；The main contributor of atmosphere pollution has been formed containing pollutants, these pollutants such as SO2 and NOx in these flue gases.Change
Nitrogen oxides after stone material combusting in exhaust emissions forms the main source of PM2.5, PM2.5 in an atmosphere through photosynthesis
It is the primary pollutant that nitrogen oxides is formed.
The method of denitration generallyd use at present is that ammonia is sprayed in solid (SCR) ammine selectivity catalytic reduction method and high temperature SNCR furnace
Method.Reducing agent used in above-mentioned two major classes denitration technology is all ammonia or urea, but uses urea and ammonia this kind raw material
The escaping of ammonia that will lead to coal burning system rear portion workshop section as reducing agent rises increase environmental pollution；Moreover, using ammonia as reduction
Agent, extra ammonia can react production ammonium sulfate with the sulfur oxide in combustion gas, and the ammonium sulfate of formation can block flue gas heat-exchange unit
It influences coal-burning boiler to operate normally, and long-term operation is unable to the ultra-clean discharge standard of meet the requirement of environmental protection.According to existing rank
Section SCR technique requires flue-gas temperature at 320 ~ 410 DEG C, catalyst meeting accelerated ageing when flue-gas temperature is excessively high, and temperature is lower than
At 300 DEG C, then side reaction can be generated.SCR technique is constrained in the application of other industry, especially to the rigors of flue-gas temperature
It is heavy polluter's steel sintering pelletizing denitrating flue gas and various Industrial Stoves, since flue-gas temperature is lower, generally only 120 ~
200 DEG C, energy consumption such as need to be increased, operating cost increases by flue gas to 280 DEG C or more using SCR technique.Current each state all exists
Low-temperature denitration catalyst is studied, but is made little progress, there is no the industrial applications of low temperature catalyst.
For how to remove the SO2 (desulfurization) in flue gas, it is known that have disclosed various ways in technology, also disclose more
Kind absorbs the desulfurizing agent of SO2 in flue gas, and such as can be alkaline matter is lime stone (calcium carbonate, CaCO3), quick lime (oxidation
Calcium, CaO) and white lime (calcium hydroxide, Ca (OH) 2), be also possible to include these substances unclassified stores.How flue gas is removed
In the pollutants such as NOx, be still the technical problem currently to be solved.
Summary of the invention
The purpose of the present invention is to provide a kind of flue gas low-temperature denitration and synchronized desulfuring processing systems and its processing method, lead to
Cross system processing flue gas can denitration under cryogenic, while synchronous removal sulfur dioxide, carbon monoxide, hydrogen chloride and
The pollutants such as VOCs.
To achieve the goals above, the technical solution adopted by the present invention is, at a kind of flue gas low-temperature denitration and synchronized desulfuring
Reason system, system includes the electrostatic precipitator being sequentially connected by flue, dust-removal and desulfurizing pretreatment unit, GWTS desulfurizing tower, more
The smoke inlet connection of phase catalysis oxidation low-temperature denitration reaction tower, wet-type electrocatalytic oxidation tower and air-introduced machine, electrostatic precipitator is useless
The air outlet of gas flue, air-introduced machine connects exhaust tube by flue, is equipped with the first spray equipment in dust-removal and desulfurizing pretreatment unit,
Spray liquid inlet and outlet the first spray liquid cyclic processing device of connection of first spray equipment, GWTS desulfurizing tower is interior to be equipped with the second spray
Device, spray liquid inlet and outlet the first spray liquid cyclic processing device of connection of the second spray equipment, heterogeneous catalytic oxidation low temperature are de-
Third spray equipment is equipped in nitre reaction tower, the spray liquid outlet of third spray equipment connects multiphase by spray liquid water inlet pipe and urges
Change the inlet of oxidation low-temperature denitration reaction tower, the leakage fluid dram of heterogeneous catalytic oxidation low-temperature denitration reaction tower connects chemical denitrification
The leakage fluid dram of the inlet of tank, chemical denitrification tank connects the second spray liquid cyclic processing device, the second spray liquid by pipeline
Cyclic processing device connects the spray liquid entrance of third spray equipment by pipeline.
As an improvement of the present invention, the dust-removal and desulfurizing pretreatment unit includes vertical gas pass, horizontal flue, and
One spray equipment includes that matrix form liquid distribution trough, spray liquid pipeline and sludge collect tapping equipment, and the flue gas of vertical gas pass enters
Mouth connects the exhanst gas outlet of electrostatic precipitator by flue, and horizontal flue is connected with vertical gas pass, matrix form liquid distribution trough
It is evenly distributed in cross section in vertical gas pass and horizontal flue, spray liquid pipeline is mounted on the outside of flue along flue direction, dirty
Mud collects tapping equipment and is set to the bottom of horizontal flue and installs along the direction of horizontal flue, and the exhanst gas outlet of horizontal flue is logical
Cross the smoke inlet of flue connection GWTS desulfurizing tower.If the spray liquid pipeline includes Trunk Line and is connected with Trunk Line
A dry by-pass line, Trunk Line connect spray liquid entrance, by-pass line be inserted into vertical gas pass and horizontal flue and with matrix form liquid
Body distributor is connected, and the quantity of matrix form liquid distribution trough and the quantity of by-pass line are consistent, each by-pass line and a liquid
Body distributor is connected, and each liquid distribution trough is equipped with several nozzles, and the spray liquid outlet connection sludge of horizontal flue is collected
The entrance of recyclable device, sludge collect the first spray liquid cyclic processing device of spray liquid outlet connection of recyclable device.
As an improvement of the present invention, the first spray liquid cyclic processing device includes first circulation pond, second
Circulating water pool, filter, flocculation sedimentation tank, sludge concentration tank, plate and frame filter press, fine filtering device, alkali dissolving tank, crystallization reaction
Kettle, centrifugal dehydrator, the inlet connection sludge in first circulation pond collect the spray liquid outlet of recyclable device, first circulation water
The tap hole in pond connects the inlet of filter by pipeline, and the liquid outlet of filter connects the first spray equipment by pipeline
Spray liquid entrance, the waste liquid port of filter, flocculation sedimentation tank, sludge concentration tank, fine filtering device pass sequentially through pipeline and are connected, essence
The liquid outlet of filter device is separately connected alkali dissolving tank and crystallization reactor, is equipped with plate and frame filter press, alkali soluble solution in sludge concentration tank
Slot connects the upper end feed inlet of crystallization reactor by pipeline, and the bottom discharge port of crystallization reactor is de- by pipeline connection centrifugation
Water dispenser, the inlet in the liquid outlet connection second circulation pond of centrifugal dehydrator, the tap hole in second circulation pond pass through pipeline
Connect the inlet of filter.
As an improvement of the present invention, second spray equipment include matrix form liquid distribution trough and with matrix form liquid
The connected spray liquid water inlet pipe of body distributor, matrix form liquid distribution trough are set to the tower top of GWTS desulfurizing tower, spray liquid water inlet
Pipe connects the inlet of GWTS desulfurizing tower and the liquid outlet of filter, the inlet connection GWTS desulfurizing tower in second circulation pond
Liquid outlet.
As an improvement of the present invention, the third spray equipment include matrix form liquid distribution trough and with matrix form liquid
The connected spray liquid water inlet pipe of body distributor, matrix form liquid distribution trough are set to heterogeneous catalytic oxidation low-temperature denitration reaction tower
Tower top, spray liquid water inlet pipe connects the inlet of heterogeneous catalytic oxidation low-temperature denitration reaction tower, at the second spray liquid circulation
Reason device includes circulating tank, filter, flocculation sedimentation tank, sludge concentration tank, plate and frame filter press, fine filtering device, alkali dissolving tank, knot
Brilliant reaction kettle, centrifugal dehydrator, the leakage fluid dram of the inlet connection chemical denitrification tank of circulating tank, the leakage fluid dram of circulating tank pass through
Pipeline connects the inlet of filter, and the tap hole of circulating tank connects the spray liquid water inlet pipe of third spray equipment, filter
Liquid outlet connects the inlet of heterogeneous catalytic oxidation low-temperature denitration reaction tower by pipeline, and in the liquid outlet and multiphase of filter
Pipeline between the inlet of catalysis oxidation low-temperature denitration reaction tower is equipped with alkaline conditioner and mouth, the waste liquid of filter is added
Mouth, flocculation sedimentation tank, sludge concentration tank, fine filtering device pass sequentially through pipeline and are connected, and the liquid outlet of fine filtering device is separately connected
Alkali dissolving tank and crystallization reactor, sludge concentration tank is interior to be equipped with plate and frame filter press, and alkali dissolving tank connects crystallization reaction by pipeline
The bottom discharge port of the upper end feed inlet of kettle, crystallization reactor connects centrifugal dehydrator by pipeline, and centrifugal dehydrator goes out liquid
The inlet of mouth connection circulating tank.
As an improvement of the present invention, the chemical denitrification tank includes the tank body of top cover and top end opening, top cover lid
Set on the top end opening portion of tank body, gas vent is equipped on top cover, offer on the side wall of tank body inlet, denitration medicament mouth,
Sour mouth is adjusted, is equipped with leakage fluid dram in the bottom of tank body, PH on-line monitoring meter and blender, inlet connection spray are equipped in tank body
Liquid water inlet pipe, denitration medicament mouth connect denitration medicament drug-feeding tube, and sour mouth is adjusted to connect sulfuric acid drug-feeding tube.
As an improvement of the present invention, it is opened in the flue being connected with the smoke inlet of dust-removal and desulfurizing pretreatment unit
Equipped with desulfurization medicament input port, heterogeneous catalytic oxidation low-temperature denitration reaction tower is equipped with denitration oxidant input port, the anti-nitre of chemistry
To change tank and is equipped with denitration medicament (denitrogenation medicament) input port, the flue entrance of GWTS desulfurizing tower is set on the side wall of tower lower end,
The flue outlet of GWTS desulfurizing tower is set on the side wall of tower upper end, the flue entrance of heterogeneous catalytic oxidation low-temperature denitration reaction tower
It is set on the side wall of tower lower end, the flue outlet of heterogeneous catalytic oxidation low-temperature denitration reaction tower is set to the side wall of tower upper end
On.
Low-temperature denitration and synchronization are realized to industrial waste gas using above-mentioned flue gas low-temperature denitration and synchronized desulfuring processing system
The processing method of desulfurization, specifically comprises the following steps:
(1) electrostatic precipitator is dusted operation to the exhaust gas being sent into from exhaust gas flue to remove particulate matter, and will processing gained
First class purification flue gas be sent into dust-removal and desulfurizing pretreatment unit in；
(2) add the desulfurization alkali as desulfurization medicament to flue from desulfurization medicament input port, and by the first spray equipment and
Vertical flue and horizontal flue circulation conveying desulfurization of the first spray liquid cyclic processing device into dust-removal and desulfurizing pretreatment unit
Spray liquid, first class purification flue gas eliminate the pollution such as SO2, particulate matter under the collective effect of desulfurization medicament and desulfurization spray liquid
Object, and secondary purification flue gas is formed, secondary purification flue gas is sent into GWTS desulfurizing tower；Desulfurization spray liquid is through first circulation pond
After collection, the first spray equipment is turned again to after the filtration treatment of filter and is sprayed again, and to obtained by filter process
The spray liquid of sub-saturated state carry out flocculation sedimentation, obtain sulfurous acid salt-mixture with ionic crystal and centrifugal dehydration treatment；
(3) secondary purification flue gas is in GWTS desulfurizing tower, by the second spray equipment and the first spray liquid cyclic processing device to
Circulation conveying desulfurization spray liquid in tower, secondary purification flue gas carry out depth under the action of desulfurization spray liquid and remove remaining SO2
Equal pollutants, and three-level purifying smoke is formed, three-level purifying smoke is sent into heterogeneous catalytic oxidation low-temperature denitration reaction tower；It is de-
Sulphur spray liquid turns again to the second spray equipment after the filtration treatment of filter and sprays again after second circulation pond is collected
Leaching, and flocculation sedimentation is carried out, with ionic crystal and centrifugal dehydration to by the spray liquid of the resulting sub-saturated state of filter process
Processing obtains sulphite；
(4) three-level purifying smoke is in heterogeneous catalytic oxidation low-temperature denitration reaction tower, and three-level purifying smoke by third by being sprayed
By the nitrogen oxygen contained by it under the double action of denitration spray liquid and the denitration oxidant put into tower that device uniformly sprays
Compound is oxidized to nitrogen dioxide, dinitrogen pentoxide, and forms level Four purifying smoke, and level Four purifying smoke is sent into wet type electro-catalysis
In oxidizing tower；Chemical denitrification tank is passed through by the denitration spray liquid that the leakage fluid dram of heterogeneous catalytic oxidation low-temperature denitration reaction tower is discharged
Chemical denitrification processing be collected by feeding circulating tank, after the filtration treatment of filter again by spray liquid in circulating tank
The secondary third spray equipment that returns to sprays again, and it is heavy to carry out flocculation to the spray liquid by the resulting sub-saturated state of filter process
It forms sediment, obtain sulfate with ionic crystal and centrifugal dehydration treatment；
(5) Pyatyi purification is obtained after carrying out wet-type electrocatalytic oxidation processing to level Four purifying smoke in wet-type electrocatalytic oxidation tower
Flue gas, and Pyatyi purifying smoke is delivered to progress high-altitude qualified discharge in exhaust tube by air-introduced machine；
(6) spray liquid containing nitrate being discharged by heterogeneous catalytic oxidation low-temperature denitration reaction tower is sent into chemical denitrification tank,
It is 2-3 that sulfuric acid is first added into chemical denitrification tank by spray liquid tune acid to pH value, and denitration medicament is then added and is stirred to react
1-2h, so that the nitrate transformation in spray liquid containing nitrate is nitrogen discharge, the water after reaction is delivered to by leakage fluid dram to be followed
It is recycled in ring tank.
As an improvement of the present invention, the desulfurization alkali includes but is not limited to sodium hydroxide, calcium hydroxide and calcium oxide
Equal water soluble alkalis, for the denitration oxidant using oxidants such as the dedicated alkali of denitration, the oxidants such as dedicated alkali of denitration include hydroxide
The one or more of sodium, calcium hydroxide, sodium hypochlorite and hydrogen peroxide.The denitration medicament includes sodium pyrosulfite, sodium sulfite
And one or more of iron powder etc..
Compared with the existing technology, the overall construction design of smoke processing system proposed by the invention is ingenious, structurally reasonable
To stablize, it is easy to accomplish manufacture, production cost is low, can be realized a whole set of complete smoke gas treatment processing scheme using the system,
Meet the discharge standard that " consumer waste incineration contamination control standard " (GB 18485-2014) is required after fume treatment, and whole
A treatment process is without spray liquid water outlet, and flue gas is converted to non-harmful nitrogen, carbon dioxide and water, without secondary pollution；It is logical
Cross heterogeneous catalytic oxidation low-temperature denitration reaction tower, first to third spray equipment, the first to the second spray liquid cyclic processing device,
Chemical denitrification tank and wet-type electrocatalytic oxidation tower are applied in combination, and provide a kind of new flue gas nitrogen oxide processing method,
Water body denitration technology is applied in waste gas pollution control and treatment, first by the conversion of nitrogen oxides Cheng Shuizhong nitrate nitrogen in flue gas, is completed
Denitrating flue gas, then nitrate nitrogen is converted to by nitrogen by chemical denitrification, flue gas nitrogen oxide is completed under cryogenic
Removal, solves the problems, such as that the high temperature denitrating technique such as traditional SCR high energy consumption, performance are unstable；It is taken off used by treatment method
Nitre technique can remove denitrification at low ambient temperatures, and removal rate is up to 90%, and denitration spray liquid recycles in system, no spray
Liquid outlet, it can be achieved that low-temperature denitration spray liquid waste water " zero-emission ", and prepare commodity level sulphate byproduct；Due to use
Heterogeneous catalytic oxidation technology is a kind of tower-type spray device, can be existed with other conventional lye spraying techniques, acid spraying technique
It synchronizes and is reacted in tower, or be used in series, while realizing that nitrogen oxides is administered, can synchronize to other sour gas, wave
Hair property organic exhaust gas VOCs is administered；And while removing removing exhaust gas sulfur dioxide, commerical grade sulphite by-product can be prepared
Product reduce operating cost.It can be seen that provided by the present invention using low-temperature denitration technique as the smoke comprehensive governing system of core
And process, there are the advantages such as low operating cost, non-wastewater discharge, without secondary pollution, and pollutant is converted to by-product
Product fundamentally solve the handling problems of nitrogen oxides and sulfur dioxide pollution object.
Detailed description of the invention
Fig. 1 is the process flow chart of flue gas low-temperature denitration of the invention and synchronized desulfuring processing method.
Specific embodiment
In order to deepen the understanding of the present invention and recognize, the invention will be further described below in conjunction with the accompanying drawings and introduces.
As shown in Figure 1, a kind of flue gas low-temperature denitration and synchronized desulfuring processing system, quiet including being sequentially connected by flue
Electric precipitator, dust-removal and desulfurizing pretreatment unit, GWTS desulfurizing tower, heterogeneous catalytic oxidation low-temperature denitration reaction tower, wet type electro-catalysis
Oxidizing tower and air-introduced machine, the smoke inlet of electrostatic precipitator connect exhaust gas flue, and the air outlet of air-introduced machine is connected by flue to be arranged
Inflator, air-introduced machine provide the power and rate of flow of flue gas, and sampling monitoring point, dedusting are arranged in the pipeline after air-introduced machine
Desulfurization pretreatment device is the first order in this system in two-step desulfurization device, can remove most of oxysulfide and remaining
Dust etc., is equipped with the first spray equipment in dust-removal and desulfurizing pretreatment unit, and the spray liquid of the first spray equipment imports and exports connection
First spray liquid cyclic processing device, GWTS desulfurizing tower is interior to be equipped with the second spray equipment, and the spray liquid of the second spray equipment passes in and out
Mouth connects the first spray liquid cyclic processing device, and third spray equipment is equipped in heterogeneous catalytic oxidation low-temperature denitration reaction tower, the
The spray liquid outlet of three spray equipments connects the inlet of heterogeneous catalytic oxidation low-temperature denitration reaction tower by spray liquid water inlet pipe,
The inlet of the leakage fluid dram connection chemical denitrification tank of heterogeneous catalytic oxidation low-temperature denitration reaction tower, the drain of chemical denitrification tank
Mouth connects the second spray liquid cyclic processing device by pipeline, and the second spray liquid cyclic processing device passes through pipeline and connects third spray
The spray liquid entrance of shower device.
Wherein, electrostatic precipitator is to differ biggish gold in two radius of curvature using the dust in electric power trapping flue gas
Belong in anode and cathode, by high voltage direct current, maintain an electric field for being enough to make gas ionization, after gas ionization caused by
Electronics: anion and cation are adsorbed on the dust by electric field, and dust is made to obtain charge.The different dust of charged polarity
Under the action of electric field force, respectively to the electrode movement of opposed polarity, deposition on the electrode, and reaches dust and gas separation
Purpose.
Preferably, the dust-removal and desulfurizing pretreatment unit include vertical gas pass (for stainless steel material), horizontal flue (for
Carbon steel serves as a contrast FRP material), the first spray equipment includes that matrix form liquid distribution trough, spray liquid pipeline and sludge collect tapping equipment,
The smoke inlet of vertical gas pass connects the exhanst gas outlet of electrostatic precipitator by flue, and horizontal flue is connected with vertical gas pass,
Matrix form liquid distribution trough is evenly distributed in cross section in vertical gas pass and horizontal flue, and spray liquid pipeline is pacified along flue direction
On the outside of flue, sludge collects tapping equipment and is set to the bottom of horizontal flue and installs along the direction of horizontal flue, horizontal
The exhanst gas outlet of flue connects the smoke inlet of GWTS desulfurizing tower by flue.The spray liquid pipeline include Trunk Line and with
Several by-pass lines that Trunk Line is connected, spray liquid pipeline are equipped with valve, and Trunk Line connects spray liquid entrance, and by-pass line is inserted
Enter in vertical gas pass and horizontal flue and with matrix form liquid distribution trough and is connected, the quantity and branch pipe of matrix form liquid distribution trough
The quantity of line is consistent, and each by-pass line is connected with a liquid distribution trough, and each liquid distribution trough is equipped with several sprays
Mouth, the spray liquid outlet connection sludge of horizontal flue collect the entrance of recyclable device, and the spray liquid that sludge collects recyclable device goes out
Mouth the first spray liquid cyclic processing device of connection.
Flue gas after electrostatic precipitation enters flue from vertical gas pass tower top, opens the valve in spray liquid pipeline, spray
Leaching liquid enters matrix form liquid distribution trough by spray liquid pipeline and is uniformly sprayed in flue, and flue gas enters level through vertical gas pass
Flue, whole spray liquid spray, removes sulphur and dust, flue gas is discharged into next process, liquid from horizontal flue tail end after purification
It mutually flows, collected through sludge collection recyclable device and is discharged in the first spray liquid cyclic processing device in stack base.
It may further be preferable that the first spray liquid cyclic processing device includes first circulation pond, second circulation water
Pond, filter, flocculation sedimentation tank, sludge concentration tank, plate and frame filter press, fine filtering device, alkali dissolving tank, crystallization reactor, centrifugation
Dewaterer, the inlet connection sludge in first circulation pond collect the spray liquid outlet of recyclable device, and first circulation pond is put
Liquid mouth connects the inlet of filter by pipeline, and the liquid outlet of filter connects the spray liquid of the first spray equipment by pipeline
Entrance, the waste liquid port of filter, flocculation sedimentation tank, sludge concentration tank, fine filtering device pass sequentially through pipeline and are connected, fine filtering device
Liquid outlet be separately connected alkali dissolving tank and crystallization reactor, plate and frame filter press is equipped in sludge concentration tank, alkali dissolving tank passes through
Pipeline connects the upper end feed inlet of crystallization reactor, and the bottom discharge port of crystallization reactor connects centrifugal dehydrator by pipeline,
The inlet in the liquid outlet connection second circulation pond of centrifugal dehydrator, the tap hole in second circulation pond were connected by pipeline
The inlet of filter.It is equipped with water circulating pump in the first circulation pond and second circulation pond, realizes desulfurization spray liquid
It is recycled, and the configuration of desulfurization spray liquid is specifically to carry out in first circulation pond and second circulation pond.
Desulfurization spray liquid part after use returns to spray liquid pipeline and continues to use, and after recycling certain number to use
Desulfurization spray liquid concentration to sub-saturated state when (being in practice sulfite concentration), will not be recycled, and pass through
Flocculation sedimentation tank collects the sub-saturated desulfurization spray liquid from filter waste liquid port, and sub-saturated desulfurization spray liquid is through flocculation sedimentation
Enter sludge concentration tank afterwards, is removed sludge from water by plate and frame filter press, water phase enters fine filtering device and further goes to remove water
Small particles object, water phase a part after refined filtration enter alkali dissolving tank dissolution alkali, and another part enters crystallization reactor, after dissolution
Alkali be added crystallization reactor, sulphite is precipitated by same ionic crystal, finally enter back into centrifugal dehydrator carry out thing liquid
Centrifuge separation, to prepare sulphite byproduct, the centrifugal clear liquid of centrifugal dehydrator is back to use second circulation pond, to realize
" zero-emission " of spray liquid waste water.
It is even furthermore preferable that second spray equipment includes matrix form liquid distribution trough and divides with matrix form liquid
The connected spray liquid water inlet pipe of cloth device, matrix form liquid distribution trough are set to the tower top of GWTS desulfurizing tower, and spray liquid water inlet pipe connects
The inlet of GWTS desulfurizing tower and the liquid outlet of filter are connect, the inlet connection GWTS desulfurizing tower in second circulation pond goes out liquid
Mouthful.GWTS desulfurizing tower is the second level in this system in two-step desulfurization device, can further remove remaining oxysulfide and
Remaining dust etc..
It is even furthermore preferable that the third spray equipment includes matrix form liquid distribution trough and divides with matrix form liquid
The connected spray liquid water inlet pipe of cloth device, matrix form liquid distribution trough are set to the tower of heterogeneous catalytic oxidation low-temperature denitration reaction tower
Top, spray liquid water inlet pipe connect the inlet of heterogeneous catalytic oxidation low-temperature denitration reaction tower, the second spray liquid circular treatment
Device includes circulating tank, filter, flocculation sedimentation tank, sludge concentration tank, plate and frame filter press, fine filtering device, alkali dissolving tank, crystallization
Reaction kettle, centrifugal dehydrator, the leakage fluid dram of the inlet connection chemical denitrification tank of circulating tank, the leakage fluid dram of circulating tank pass through pipe
Road connects the inlet of filter, the spray liquid water inlet pipe of the tap hole connection third spray equipment of circulating tank, and filter goes out
Liquid mouth connects the inlet of heterogeneous catalytic oxidation low-temperature denitration reaction tower by pipeline, and urges in the liquid outlet of filter with multiphase
Change oxidation low-temperature denitration reaction tower inlet between pipeline be equipped with alkaline conditioner be added mouth, the waste liquid port of filter,
Flocculation sedimentation tank, sludge concentration tank, fine filtering device pass sequentially through pipeline and are connected, and the liquid outlet of fine filtering device is separately connected alkali soluble
Slot and crystallization reactor are solved, plate and frame filter press is equipped in sludge concentration tank, alkali dissolving tank connects crystallization reactor by pipeline
The bottom discharge port of upper end feed inlet, crystallization reactor connects centrifugal dehydrator by pipeline, and the liquid outlet of centrifugal dehydrator connects
Connect the inlet of circulating tank.
Denitration spray liquid after use is expelled to from the leakage fluid dram of heterogeneous catalytic oxidation low-temperature denitration reaction tower is set to it
It is stored in the receiving tank of bottom, while being delivered to the inlet of chemical denitrification tank by receiving tank, in chemical denitrification tank
It is delivered in circulating tank after carrying out chemical denitrification processing, and the concentration of the denitration spray liquid after recycling certain number to use
, will not be recycled when to sub-saturated state (being in practice sulfate concentration), and by flocculation sedimentation tank collect from
The sub-saturated denitration spray liquid of filter waste liquid port, sub-saturated denitration spray liquid enter sludge concentration tank after flocculation sedimentation, lead to
It crosses plate and frame filter press and removes sludge from water, water phase enters fine filtering device and further removes water removal small particles object, after refined filtration
Water phase a part enters alkali dissolving tank dissolution alkali, and another part enters crystallization reactor, and crystallization reactor is added in dissolved alkali,
Sulfuric acid is salted out by same ionic crystal, centrifugal dehydrator is finally entered back into and carries out thing liquid separation, to prepare sulfate by-product
The centrifugal clear liquid of product, centrifugal dehydrator is back to use circulating tank.
It is even furthermore preferable that the chemical denitrification tank includes the tank body of top cover and top end opening, top cover is covered on
The top end opening portion of tank body is equipped with gas vent on top cover, and inlet is offered on the side wall of tank body, denitration medicament mouth, adjusts acid
Mouthful, the bottom of tank body be equipped with leakage fluid dram, in tank body be equipped with PH on-line monitoring meter and blender, inlet connect spray liquid into
Water pipe, denitration medicament mouth connect denitration medicament drug-feeding tube, and sour mouth is adjusted to connect sulfuric acid drug-feeding tube.
Spray liquid containing nitrate is added in chemical denitrification tank from inlet, and sulphur is added from the sour mouth of tune by sulfuric acid drug-feeding tube
The pH value of acid adjusting spray liquid stops adding sulfuric acid when meter detects that pH value is 2-3, then passes through denitration until formerly monitoring in PH
Denitration medicament is added from denitration medicament mouth in medicament drug-feeding tube, 1-2h is stirred to react by blender, so that nitrate nitrogen is converted into
Nitrogen is discharged from gas vent, and the water after reaction is delivered in circulating tank by leakage fluid dram to be recycled.
It is even furthermore preferable that being offered in the flue being connected with the smoke inlet of dust-removal and desulfurizing pretreatment unit
Desulfurization medicament input port, heterogeneous catalytic oxidation low-temperature denitration reaction tower are equipped with denitration oxidant input port, chemical denitrification tank
It is equipped with denitration medicament input port, the flue entrance of GWTS desulfurizing tower is set on the side wall of tower lower end, the cigarette of GWTS desulfurizing tower
Road outlet be set on the side wall of tower upper end, desulfurization spray liquid sprays downwards in GWTS desulfurization column overhead, spray liquid from top to bottom,
Flue gas flows from top to bottom, and the desulfurization effect of flue gas can be improved；The flue entrance of heterogeneous catalytic oxidation low-temperature denitration reaction tower is set
It being placed on the side wall of tower lower end, the flue outlet of heterogeneous catalytic oxidation low-temperature denitration reaction tower is set on the side wall of tower upper end,
Denitration spray liquid sprays downwards in GWTS desulfurization column overhead, and from top to bottom, flue gas flows spray liquid from top to bottom, and flue gas can be improved
Denitration effect.
Low-temperature denitration and synchronization are realized to industrial waste gas using above-mentioned flue gas low-temperature denitration and synchronized desulfuring processing system
The processing method of desulfurization, specifically comprises the following steps:
(1) electrostatic precipitator is dusted operation to the exhaust gas being sent into from exhaust gas flue to remove particulate matter, and will processing gained
First class purification flue gas be sent into dust-removal and desulfurizing pretreatment unit in；
(2) the desulfurization alkali as desulfurization medicament is added to flue from desulfurization medicament input port, is specifically configured to desulfurization alkali
Alkali spray liquid is added in liquid form in pretreatment unit flue, and is recycled by the first spray equipment and the first spray liquid
Vertical flue and horizontal flue circulation conveying desulfurization spray liquid of the processing unit into dust-removal and desulfurizing pretreatment unit, first class purification
Flue gas eliminates the pollutants such as SO2, particulate matter under the collective effect of desulfurization medicament and desulfurization spray liquid, and forms secondary purification
Secondary purification flue gas is sent into GWTS desulfurizing tower by flue gas；Desulfurization spray liquid is after first circulation pond is collected, by filter
Filtration treatment after turn again to the first spray equipment and spray again, and to the spray by the resulting sub-saturated state of filter process
Liquid carries out flocculation sedimentation, obtains sulfurous acid salt-mixture with ionic crystal and centrifugal dehydration treatment；
(3) secondary purification flue gas is in GWTS desulfurizing tower, by the second spray equipment and the first spray liquid cyclic processing device to
Circulation conveying desulfurization spray liquid in tower, secondary purification flue gas carry out depth under the action of desulfurization spray liquid and remove remaining SO2
Equal pollutants, and three-level purifying smoke is formed, three-level purifying smoke is sent into heterogeneous catalytic oxidation low-temperature denitration reaction tower；It is de-
Sulphur spray liquid turns again to the second spray equipment after the filtration treatment of filter and sprays again after second circulation pond is collected
Leaching, and flocculation sedimentation is carried out, with ionic crystal and centrifugal dehydration to by the spray liquid of the resulting sub-saturated state of filter process
Processing obtains sulphite；
(4) three-level purifying smoke is in heterogeneous catalytic oxidation low-temperature denitration reaction tower, and three-level purifying smoke by third by being sprayed
By the nitrogen oxygen contained by it under the double action of denitration spray liquid and the denitration oxidant put into tower that device uniformly sprays
Compound is oxidized to nitrogen dioxide, dinitrogen pentoxide, and forms level Four purifying smoke, and level Four purifying smoke is sent into wet type electro-catalysis
In oxidizing tower；Chemical denitrification tank is passed through by the denitration spray liquid that the leakage fluid dram of heterogeneous catalytic oxidation low-temperature denitration reaction tower is discharged
Chemical denitrification processing be collected by feeding circulating tank, after the filtration treatment of filter again by spray liquid in circulating tank
The secondary third spray equipment that returns to sprays again, and it is heavy to carry out flocculation to the spray liquid by the resulting sub-saturated state of filter process
It forms sediment, obtain sulfate with ionic crystal and centrifugal dehydration treatment；By adding the oxidants such as the dedicated alkali of denitration in tower, by nitrogen oxidation
Object is oxidized to nitrogen dioxide, dinitrogen pentoxide, then is converted to nitrate and water by the effect of the dedicated alkali of denitration, reaches smoke abatement
The purpose of gas nitrogen oxides；
(5) Pyatyi purification is obtained after carrying out wet-type electrocatalytic oxidation processing to level Four purifying smoke in wet-type electrocatalytic oxidation tower
Flue gas, and Pyatyi purifying smoke is delivered to progress high-altitude qualified discharge in exhaust tube by air-introduced machine；
(6) spray liquid containing nitrate being discharged by heterogeneous catalytic oxidation low-temperature denitration reaction tower is sent into chemical denitrification tank,
It is 2-3 that sulfuric acid is first added into chemical denitrification tank by spray liquid tune acid to pH value, and denitration medicament is then added and is stirred to react
1-2h, so that the nitrate transformation in spray liquid containing nitrate is that non-harmful nitrogen is discharged from gas vent, the water after reaction is logical
It crosses leakage fluid dram and is delivered in circulating tank and recycled.
Preferably, the desulfurization alkali includes but is not limited to the water soluble alkalis such as sodium hydroxide, calcium hydroxide and calcium oxide, institute
Denitration oxidant is stated using the oxidants such as the dedicated alkali of denitration, the oxidants such as dedicated alkali of denitration include sodium hydroxide, calcium hydroxide, secondary
The one or more of sodium chlorate and hydrogen peroxide.The denitration medicament includes one in sodium pyrosulfite, sodium sulfite and iron powder etc.
Kind is several.
Embodiment
The main oil-containing SOX, NOX of flue gas that certain company's waste incineration workshop generates, HCL, CO, the main pollution such as dirt because
Son.Exhaust-gas treatment amount: 120000 m3/h, 200 DEG C of house outlet temperature.Flue gas initial concentration: sulfur dioxide 500mg/m3,
Nitrogen oxides 500mg/m3, other pollutants are exceeded.Desulfurization spray liquid select 10% sodium hydroxide solution, the dedicated alkali of denitration and
Oxidant selects 5% sodium hydroxide and 30% hydrogen peroxide, and reduction denitration medicament selects iron powder and sodium pyrosulfite confection, wherein
Iron powder accounts for 10%, and sodium pyrosulfite accounts for 90%, dosage 60kg/h.Sampling monitoring analysis is carried out in sampling monitoring point, wherein dioxy
Change sulphur concentration is 7mg/L, and nitrous oxides concentration 17mg/L, removal rate is respectively 98.6% and 96.6%, the outlet of other pollutants
Concentration is up to standard.Specific data are as follows:
| Serial number | Pollutant title | Unit | Import value | Export value | GB18485 standard value | Remarks |
| 1 | Flue dust | (mg/Nm3) | 300-400 | 8 | 20 | |
| 2 | HCl | (mg/Nm3) | 200 | 5 | 50 | |
| 3 | HF | (mg/Nm3) | - | - | - | |
| 4 | SOx | (mg/Nm3) | 500 | 7 | 80 | |
| 5 | NOx | (mg/Nm3) | 500 | 17 | 250 | |
| 6 | CO | (mg/Nm3) | 2000 | 52 | 80 | |
| 7 | TOC | (mg/Nm3) | - | - | - | |
| 8 | Hg | (mg/Nm3) | 0.05 | 0.01 | 0.05 | |
| 9 | Cd+Ti | (mg/Nm3) | 0.1 | 0.04 | 0.1 | |
| 10 | Other heavy metals | (mg/Nm3) | 1 | 0.56 | 1 | |
| 11 | Dioxin | (ngTEQ/NM3) | 1 | 0.02 | 0.1 |
In addition, take chemical denitrification tank Inlet and outlet water concentration mensuration nitrate nitrogen, influent concentration 2400mg/L, aqueous concentration is
138mg/L, removal rate 94.25%.Water after removal nitrate anion returns to heterogeneous catalytic oxidation tower as spray liquid after adjusting.
From experimental data as can be seen that flue gas is after purification, pollutant meets discharge standard, can be with direct emission, nitrogen
Oxide is converted to nitrate nitrogen in water, is then reduced into nitrogen discharge.
The technical means disclosed in the embodiments of the present invention is not limited only to technological means disclosed in above embodiment, further includes
Technical solution consisting of any combination of the above technical features.It should be pointed out that for those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (9)
1. a kind of flue gas low-temperature denitration and synchronized desulfuring processing system, it is characterised in that: quiet including being sequentially connected by flue
Electric precipitator, dust-removal and desulfurizing pretreatment unit, GWTS desulfurizing tower, heterogeneous catalytic oxidation low-temperature denitration reaction tower, wet type electro-catalysis
Oxidizing tower and air-introduced machine, the smoke inlet of electrostatic precipitator connect exhaust gas flue, and the air outlet of air-introduced machine is connected by flue to be arranged
Inflator is equipped with the first spray equipment, the spray liquid inlet and outlet connection first of the first spray equipment in dust-removal and desulfurizing pretreatment unit
Spray liquid cyclic processing device, GWTS desulfurizing tower is interior to be equipped with the second spray equipment, and the spray liquid of the second spray equipment, which is imported and exported, to be connected
The first spray liquid cyclic processing device is connect, third spray equipment, third spray are equipped in heterogeneous catalytic oxidation low-temperature denitration reaction tower
The spray liquid outlet of shower device connects the inlet of heterogeneous catalytic oxidation low-temperature denitration reaction tower, multiphase by spray liquid water inlet pipe
The inlet of the leakage fluid dram connection chemical denitrification tank of catalysis oxidation low-temperature denitration reaction tower, the leakage fluid dram of chemical denitrification tank are logical
Piping connects the second spray liquid cyclic processing device, and the second spray liquid cyclic processing device connects third spray dress by pipeline
The spray liquid entrance set.
2. a kind of flue gas low-temperature denitration as described in claim 1 and synchronized desulfuring processing system, which is characterized in that the dedusting
Desulfurization pretreatment device includes vertical gas pass, horizontal flue, and the first spray equipment includes matrix form liquid distribution trough, spray liquid pipe
Line and sludge collect tapping equipment, and the smoke inlet of vertical gas pass connects the exhanst gas outlet of electrostatic precipitator by flue, horizontal
Flue is connected with vertical gas pass, and matrix form liquid distribution trough is evenly distributed in cross section in vertical gas pass and horizontal flue, spray
Liquid showering tube line is mounted on the outside of flue along flue direction, and sludge collects tapping equipment and is set to the bottom of horizontal flue and along water
The direction of flat flue is installed, and the exhanst gas outlet of horizontal flue connects the smoke inlet of GWTS desulfurizing tower by flue；The spray
Liquid pipe line includes Trunk Line and several by-pass lines being connected with Trunk Line, and Trunk Line connects spray liquid entrance, by-pass line
It is inserted into vertical gas pass and horizontal flue and is connected with matrix form liquid distribution trough, the quantity and branch of matrix form liquid distribution trough
The quantity of pipeline is consistent, and each by-pass line is connected with a liquid distribution trough, and each liquid distribution trough is equipped with several
Nozzle, the spray liquid outlet connection sludge of horizontal flue collect the entrance of recyclable device, and sludge collects the spray liquid of recyclable device
The first spray liquid cyclic processing device of outlet connection.
3. a kind of flue gas low-temperature denitration as claimed in claim 2 and synchronized desulfuring processing system, which is characterized in that described first
Spray liquid cyclic processing device include first circulation pond, second circulation pond, filter, flocculation sedimentation tank, sludge concentration tank,
Plate and frame filter press, fine filtering device, alkali dissolving tank, crystallization reactor, centrifugal dehydrator, the inlet in first circulation pond connect dirty
Mud collects the spray liquid outlet of recyclable device, and the tap hole in first circulation pond connects the inlet of filter, mistake by pipeline
The liquid outlet of filter connects the spray liquid entrance of the first spray equipment, the waste liquid port of filter, flocculation sedimentation tank, dirt by pipeline
Mud thickener, fine filtering device pass sequentially through pipeline and are connected, and the liquid outlet of fine filtering device is separately connected alkali dissolving tank and crystallization is anti-
Kettle is answered, plate and frame filter press is equipped in sludge concentration tank, alkali dissolving tank connects the upper end feed inlet of crystallization reactor, knot by pipeline
The bottom discharge port of brilliant reaction kettle connects centrifugal dehydrator by pipeline, and the liquid outlet of centrifugal dehydrator connects second circulation pond
Inlet, the tap hole in second circulation pond passes through the inlet that pipeline connects filter.
4. a kind of flue gas low-temperature denitration as claimed in claim 3 and synchronized desulfuring processing system, which is characterized in that described second
Spray equipment includes matrix form liquid distribution trough and the spray liquid water inlet pipe being connected with matrix form liquid distribution trough, matrix form liquid
Distributor is set to the tower top of GWTS desulfurizing tower, and spray liquid water inlet pipe connects the inlet of GWTS desulfurizing tower and the liquid out of filter
Mouthful, the liquid outlet of the inlet connection GWTS desulfurizing tower in second circulation pond.
5. a kind of flue gas low-temperature denitration as claimed in claim 4 and synchronized desulfuring processing system, which is characterized in that the third
Spray equipment includes matrix form liquid distribution trough and the spray liquid water inlet pipe being connected with matrix form liquid distribution trough, matrix form liquid
Distributor is set to the tower top of heterogeneous catalytic oxidation low-temperature denitration reaction tower, and spray liquid water inlet pipe connects heterogeneous catalytic oxidation low temperature
The inlet of denitration reaction tower, the second spray liquid cyclic processing device include circulating tank, filter, flocculation sedimentation tank, dirt
The inlet of mud thickener, plate and frame filter press, fine filtering device, alkali dissolving tank, crystallization reactor, centrifugal dehydrator, circulating tank connects
The leakage fluid dram of chemical denitrification tank is connect, the leakage fluid dram of circulating tank connects the inlet of filter, the tapping of circulating tank by pipeline
The spray liquid water inlet pipe of mouth connection third spray equipment, the liquid outlet of filter connect heterogeneous catalytic oxidation low temperature by pipeline and take off
The inlet of nitre reaction tower, and between the liquid outlet of filter and the inlet of heterogeneous catalytic oxidation low-temperature denitration reaction tower
Pipeline is equipped with alkaline conditioner and mouth is added, and the waste liquid port of filter, flocculation sedimentation tank, sludge concentration tank, fine filtering device are successively
It is connected by pipeline, the liquid outlet of fine filtering device is separately connected alkali dissolving tank and crystallization reactor, is equipped in sludge concentration tank
Plate and frame filter press, alkali dissolving tank connect the upper end feed inlet of crystallization reactor, the bottom discharge port of crystallization reactor by pipeline
Centrifugal dehydrator, the inlet of the liquid outlet connection circulating tank of centrifugal dehydrator are connected by pipeline.
6. a kind of flue gas low-temperature denitration as claimed in claim 5 and synchronized desulfuring processing system, which is characterized in that the chemistry
Denitrification tank includes the tank body of top cover and top end opening, and top cover is covered on the top end opening portion of tank body, and exhaust is equipped on top cover
Hole, inlet, denitration medicament mouth are offered on the side wall of tank body, adjusts sour mouth, leakage fluid dram are equipped in the bottom of tank body, in tank body
Meter and blender are monitored on-line equipped with PH, inlet connects spray liquid water inlet pipe, and denitration medicament mouth connects denitration medicament drug-feeding tube,
Sour mouth is adjusted to connect sulfuric acid drug-feeding tube.
7. a kind of flue gas low-temperature denitration as claimed in any one of claims 1 to 6 and synchronized desulfuring processing system, which is characterized in that
Desulfurization medicament input port, heterogeneous catalysis oxygen are offered in the flue being connected with the smoke inlet of dust-removal and desulfurizing pretreatment unit
Change low-temperature denitration reaction tower and be equipped with denitration oxidant input port, chemical denitrification tank is equipped with denitration medicament input port, GWTS
The flue entrance of desulfurizing tower is set on the side wall of tower lower end, and the flue outlet of GWTS desulfurizing tower is set to the side wall of tower upper end
On, the flue entrance of heterogeneous catalytic oxidation low-temperature denitration reaction tower is set on the side wall of tower lower end, heterogeneous catalytic oxidation low temperature
The flue outlet of denitration reaction tower is set on the side wall of tower upper end.
8. the method for carrying out fume treatment using flue gas low-temperature denitration as claimed in claim 7 and synchronized desulfuring processing system,
It is characterized in that, this method specifically comprises the following steps:
(1) electrostatic precipitator is dusted operation to the exhaust gas being sent into from exhaust gas flue to remove particulate matter, and will processing gained
First class purification flue gas be sent into dust-removal and desulfurizing pretreatment unit in；
(2) add the desulfurization alkali as desulfurization medicament to flue from desulfurization medicament input port, and by the first spray equipment and
Vertical flue and horizontal flue circulation conveying desulfurization of the first spray liquid cyclic processing device into dust-removal and desulfurizing pretreatment unit
Spray liquid, first class purification flue gas eliminate SO2 and Particulate Pollution object under the collective effect of desulfurization medicament and desulfurization spray liquid,
And secondary purification flue gas is formed, secondary purification flue gas is sent into GWTS desulfurizing tower；Desulfurization spray liquid is received through first circulation pond
After collection, the first spray equipment is turned again to after the filtration treatment of filter and is sprayed again, and to resulting by filter process
The spray liquid of sub-saturated state carries out flocculation sedimentation, obtains sulfurous acid salt-mixture with ionic crystal and centrifugal dehydration treatment；
(3) secondary purification flue gas is in GWTS desulfurizing tower, by the second spray equipment and the first spray liquid cyclic processing device to
Circulation conveying desulfurization spray liquid in tower, secondary purification flue gas carry out depth under the action of desulfurization spray liquid and remove remaining SO2
Pollutant, and three-level purifying smoke is formed, three-level purifying smoke is sent into heterogeneous catalytic oxidation low-temperature denitration reaction tower；Desulfurization
Spray liquid turns again to the second spray equipment after the filtration treatment of filter and sprays again after second circulation pond is collected,
And flocculation sedimentation is carried out, with ionic crystal and centrifugal dehydration treatment to by the spray liquid of the resulting sub-saturated state of filter process
Obtain sulphite；
(4) three-level purifying smoke is in heterogeneous catalytic oxidation low-temperature denitration reaction tower, and three-level purifying smoke by third by being sprayed
By the nitrogen oxygen contained by it under the double action of denitration spray liquid and the denitration oxidant put into tower that device uniformly sprays
Compound is oxidized to nitrogen dioxide, dinitrogen pentoxide, and forms level Four purifying smoke, and level Four purifying smoke is sent into wet type electro-catalysis
In oxidizing tower；Chemical denitrification tank is passed through by the denitration spray liquid that the leakage fluid dram of heterogeneous catalytic oxidation low-temperature denitration reaction tower is discharged
Chemical denitrification processing be collected by feeding circulating tank, after the filtration treatment of filter again by spray liquid in circulating tank
The secondary third spray equipment that returns to sprays again, and it is heavy to carry out flocculation to the spray liquid by the resulting sub-saturated state of filter process
It forms sediment, obtain sulfate with ionic crystal and centrifugal dehydration treatment；
(5) Pyatyi purification is obtained after carrying out wet-type electrocatalytic oxidation processing to level Four purifying smoke in wet-type electrocatalytic oxidation tower
Flue gas, and Pyatyi purifying smoke is delivered to progress high-altitude qualified discharge in exhaust tube by air-introduced machine；
(6) spray liquid containing nitrate being discharged by heterogeneous catalytic oxidation low-temperature denitration reaction tower is sent into chemical denitrification tank,
It is 2-3 that sulfuric acid is first added into chemical denitrification tank by spray liquid tune acid to pH value, and denitration medicament is then added and is stirred to react
1-2h, so that the nitrate transformation in spray liquid containing nitrate is nitrogen discharge, the water after reaction is delivered to by leakage fluid dram to be followed
It is recycled in ring tank.
9. processing method as claimed in claim 8, which is characterized in that the desulfurization alkali include sodium hydroxide, calcium hydroxide and
Calcium oxide, the denitration oxidant use the dedicated alkali oxidant of denitration, and the dedicated alkali oxidant of denitration includes sodium hydroxide, hydroxide
The one or more of calcium, sodium hypochlorite and hydrogen peroxide, the denitration medicament include in sodium pyrosulfite, sodium sulfite and iron powder
It is one or more of.
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| WO2021088525A1 (en) * | 2019-11-05 | 2021-05-14 | 中冶长天国际工程有限责任公司 | Flue gas multi-pollutant collaborative purification process method and apparatus |
| CN115193233A (en) * | 2022-08-25 | 2022-10-18 | 金川集团股份有限公司 | A system and method for processing smelting flue gas |
| CN115463540A (en) * | 2022-09-26 | 2022-12-13 | 广东青扬环保科技有限公司 | Micro-object dynamic catalytic desulfurization, denitration and whitening integrated device |
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