CN111701440A - Dry-type denitration ultrafine powder for synergistically realizing ultralow emission of flue gas and preparation method and application thereof - Google Patents
Dry-type denitration ultrafine powder for synergistically realizing ultralow emission of flue gas and preparation method and application thereof Download PDFInfo
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- CN111701440A CN111701440A CN202010554350.8A CN202010554350A CN111701440A CN 111701440 A CN111701440 A CN 111701440A CN 202010554350 A CN202010554350 A CN 202010554350A CN 111701440 A CN111701440 A CN 111701440A
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- 239000000843 powder Substances 0.000 title claims abstract description 138
- 239000003546 flue gas Substances 0.000 title claims abstract description 34
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 69
- 229910052742 iron Inorganic materials 0.000 claims abstract description 30
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 27
- 239000001301 oxygen Substances 0.000 claims abstract description 27
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000002245 particle Substances 0.000 claims abstract description 14
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000011575 calcium Substances 0.000 claims abstract description 13
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 13
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 13
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 13
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 239000004927 clay Substances 0.000 claims abstract description 8
- 239000007787 solid Substances 0.000 claims abstract description 8
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 claims description 33
- 239000011019 hematite Substances 0.000 claims description 32
- 229910052595 hematite Inorganic materials 0.000 claims description 32
- 238000000227 grinding Methods 0.000 claims description 23
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 claims description 23
- 239000011028 pyrite Substances 0.000 claims description 22
- 229910052683 pyrite Inorganic materials 0.000 claims description 22
- 238000006243 chemical reaction Methods 0.000 claims description 19
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 15
- 229910021646 siderite Inorganic materials 0.000 claims description 15
- 230000001590 oxidative effect Effects 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 10
- 239000007800 oxidant agent Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 8
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 8
- 239000012634 fragment Substances 0.000 claims description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000003463 adsorbent Substances 0.000 claims description 6
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 5
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 3
- 239000000292 calcium oxide Substances 0.000 claims description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 3
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims description 3
- 239000000395 magnesium oxide Substances 0.000 claims description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 3
- 239000003595 mist Substances 0.000 claims description 3
- 239000011734 sodium Substances 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- 239000004408 titanium dioxide Substances 0.000 claims description 3
- 238000000746 purification Methods 0.000 claims description 2
- 238000006477 desulfuration reaction Methods 0.000 claims 13
- 230000023556 desulfurization Effects 0.000 claims 13
- HQKMJHAJHXVSDF-UHFFFAOYSA-L magnesium stearate Chemical compound [Mg+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O HQKMJHAJHXVSDF-UHFFFAOYSA-L 0.000 claims 6
- 235000019359 magnesium stearate Nutrition 0.000 claims 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims 1
- 239000007921 spray Substances 0.000 claims 1
- 239000011593 sulfur Substances 0.000 claims 1
- 229910052717 sulfur Inorganic materials 0.000 claims 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 82
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 14
- 239000003638 chemical reducing agent Substances 0.000 abstract description 13
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 abstract description 12
- 238000005516 engineering process Methods 0.000 abstract description 9
- 239000003054 catalyst Substances 0.000 abstract description 7
- 238000010276 construction Methods 0.000 abstract description 7
- 239000007789 gas Substances 0.000 abstract description 7
- 238000007254 oxidation reaction Methods 0.000 abstract description 7
- 125000002887 hydroxy group Chemical group [H]O* 0.000 abstract description 6
- 239000013078 crystal Substances 0.000 abstract description 5
- 230000002195 synergetic effect Effects 0.000 abstract description 5
- 150000003839 salts Chemical class 0.000 abstract description 4
- 239000011573 trace mineral Chemical class 0.000 abstract description 4
- 235000013619 trace mineral Nutrition 0.000 abstract description 4
- 239000002028 Biomass Substances 0.000 abstract description 3
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 3
- 238000013329 compounding Methods 0.000 abstract description 2
- 239000002574 poison Substances 0.000 abstract 1
- 231100000614 poison Toxicity 0.000 abstract 1
- 238000001179 sorption measurement Methods 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 5
- 238000000354 decomposition reaction Methods 0.000 description 5
- 239000000428 dust Substances 0.000 description 5
- -1 hydroxyl radicals Chemical class 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 150000003254 radicals Chemical class 0.000 description 5
- 238000003916 acid precipitation Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- TUJKJAMUKRIRHC-UHFFFAOYSA-N hydroxyl Chemical compound [OH] TUJKJAMUKRIRHC-UHFFFAOYSA-N 0.000 description 4
- 231100000252 nontoxic Toxicity 0.000 description 4
- 230000003000 nontoxic effect Effects 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 206010063385 Intellectualisation Diseases 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N sulfur dioxide Inorganic materials O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 2
- OUUQCZGPVNCOIJ-UHFFFAOYSA-M Superoxide Chemical compound [O-][O] OUUQCZGPVNCOIJ-UHFFFAOYSA-M 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009967 tasteless effect Effects 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 1
- AVXURJPOCDRRFD-UHFFFAOYSA-N Hydroxylamine Chemical class ON AVXURJPOCDRRFD-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- BVCZEBOGSOYJJT-UHFFFAOYSA-N ammonium carbamate Chemical compound [NH4+].NC([O-])=O BVCZEBOGSOYJJT-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- KXDHJXZQYSOELW-UHFFFAOYSA-N carbonic acid monoamide Natural products NC(O)=O KXDHJXZQYSOELW-UHFFFAOYSA-N 0.000 description 1
- 238000004523 catalytic cracking Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000006356 dehydrogenation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000007337 electrophilic addition reaction Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000005281 excited state Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000010574 gas phase reaction Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 231100001240 inorganic pollutant Toxicity 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002075 main ingredient Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 210000005036 nerve Anatomy 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 229940062054 oxygen 30 % Drugs 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000027756 respiratory electron transport chain Effects 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000000243 solution 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
- B01D53/81—Solid phase processes
- B01D53/83—Solid phase processes with moving reactants
-
- 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
- B01D53/02—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 by adsorption, e.g. preparative gas chromatography
- B01D53/06—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 by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds
-
- 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
- B01D53/565—Nitrogen oxides by treating the gases with solids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses dry denitration superfine powder for synergistically realizing ultralow emission of flue gas, a manufacturing method and application thereof, relates to the field of denitration, and aims to solve the problems that the existing SCR denitration technology is high in cost, complex in construction, easy to poison and lose efficacy of a catalyst and difficult to treat as dangerous waste; the SNCR denitration technology has the problems of low denitration rate and incapability of achieving ultralow emission. The invention is prepared by compounding calcium hydroxide, sodium bicarbonate, calcium-based particle clay, micron amino reducing powder, iron ore and the like. The invention is applied to flue gas denitration of boiler, kiln, power station boiler and biomass boiler. The invention mixes micron amino reducing agent and calcium hydroxide and quickly decomposes and gasifies after being heated to generate high-activity ammonia gas which is decomposed with NO to form hydroxyl free radicals under the synergistic action of the ammonia gas and solid crystal oxygen in the denitration ultramicro powderx gas produces super oxidation reaction to oxidize nitrogen oxide into CO without selectivity2、H2O and trace mineral salt, which can greatly improve the denitration rate.
Description
Technical Field
The invention relates to the field of denitration, and mainly relates to dry-type ultralow-emission denitration ultrafine powder for flue gas of coal-fired boilers, kilns, power station boilers and biomass boilers, in particular to dry-type denitration ultrafine powder for realizing ultralow emission of flue gas in a synergistic manner, and a manufacturing method and application thereof.
Background
Nitrogen Oxides (NO)X) Environmental pollution has become an increasing global problem, and is one of the major atmospheric pollutants. The acid rain and photochemical smog generated by the method can cause crops and forests to wither in large areas, the acid rain can also corrode bridges and buildings and shorten the service life, the photochemical smog has an obvious carcinogenic effect, and ozone in the near-earth atmosphere can cause great damage to the central nerves and the respiratory tract of people. One of the main sources of nitrogen oxides is the harmful components generated by coal combustion and released into the atmosphere, and secondly, the exhaust gas discharged by automobiles also contains a large amount of nitrogen oxides, wherein the nitrogen oxides include NO and NO2、N2O、N2O2、N2O3、N2O4And N2O5And the most serious pollution to the atmosphere is mainly NO and NO2Wherein NO accounts for 95% of NOx in the flue gas of the coal-fired boiler, and the investigation shows that the NOx has the substitution of SO2And the acid rain becomes the main cause of acid rain. With the development of the thermal power industry and the heating of residents in China and the rapid popularization of private cars, the emission total amount of nitrogen oxides is increased to ultralow emission while the emission of the nitrogen oxides is limited, the emission of nitrogen oxide pollution is reduced, and the control of denitration of a coal-fired boiler is an important measure for reducing the emission of the nitrogen oxides.
At present, the denitration technologies commonly used in China include denitration by an SCR (selective catalytic reduction) catalyst method and denitration by an SCNR (selective non-catalytic reduction) wet method. The SCR denitration rate is higher and reaches more than 85%, but the boiler modification project is huge, the construction is complex, the investment is very high, the service life is short, the boiler modification project needs to be repeatedly replaced and modified for two or three years, the operation cost after the investment is converted is very high, if the flue gas contains high arsenic, sodium, potassium and other heavy metals, the catalyst is easy to be poisoned and lose efficacy, the catalyst belongs to dangerous waste products and is not allowed to be randomly disposed or discarded, the qualified treatment cost is very high, and the serious secondary pollution exists. The SNCR wet denitration investment is less, but the operation cost is higher, the denitration rate can only reach 40% -50%, the single technology cannot realize ultralow emission and secondary pollution ammonia escape.
In conclusion, at present, there is an urgent need in China to provide a denitration ultrafine powder which is low in construction investment, low in operating cost, simple in construction, long in service life, non-toxic, harmless, free of secondary pollution, high in activity and capable of achieving ultralow emission so as to meet the increasingly stringent ultralow emission requirement of the environmental protection department.
Disclosure of Invention
The invention aims to solve the problems of high construction cost, high operation cost after investment conversion, long construction period, complex construction, easy poisoning and invalidation of a catalyst, difficult treatment and extremely high treatment cost of the catalyst serving as a dangerous waste product in the prior art in the SCR denitration technology, and simultaneously solve the problems of low SNCR wet denitration rate and incapability of realizing ultralow emission. The invention realizes standardization and modularization of manufacturing of denitration ultrafine powder matched denitration equipment and automation and intellectualization of operation of the denitration equipment for the first time in China, and provides a breakthrough feasible scheme for synergistically realizing ultra-low emission of flue gas for the atmosphere control industry, wherein dry denitration is abbreviated as NSDD.
The dry-type denitration ultrafine powder for synergistically realizing ultralow emission of flue gas is characterized by being prepared by compounding 2-5 parts by weight of calcium hydroxide, 12-21 parts by weight of sodium bicarbonate, 2-5 parts by weight of calcium-based granular argil, 40-65 parts by weight of micron amino reducing agent and 4-25 parts by weight of iron ore.
Further, the iron ore is hematite ore with 50-60% of iron content and more than 30% of oxygen content, and the hematite is prepared by carrying out primary crushing, secondary crushing and pre-grinding on a bin, and grinding into superfine powder by using a vibration feeder, a mechanical grinder and a superfine impact grinder.
The primary crusher is an European jaw crusher, and the secondary crusher is a hydraulic cone crusher.
Further, the iron ore is prepared by mixing hematite, pyrite and siderite, wherein hematite coarse powder (5 meshes) with the iron content of 50-60% and the oxygen content of more than 30% is mixed with the pyrite coarse powder and the siderite coarse powder, and then the mixture is ground into superfine powder through a mechanical grinder and a superfine impact grinder; wherein the mass ratio of the hematite, the pyrite and the siderite is 5:3: 2.
Further, the iron element in the hematite ultra-fine powder accounts for 55 percent by mass, the oxygen content accounts for 30 percent by mass, and the balance of the adsorbent and the oxidant; wherein, the adsorbent and the oxidant are both: one or more of calcium oxide, magnesium oxide, manganese dioxide and titanium dioxide.
The adsorbent and the oxidant are used for instantly oxidizing calcium, magnesium, manganese and titanium superfine powder into calcium oxide, magnesium oxide, manganese dioxide and titanium dioxide under the high-temperature and high-oxygen environment of the hearth.
The invention relates to dry-type denitration superfine powder for synergistically realizing ultralow emission of flue gas and a preparation method thereof, which are carried out according to the following steps:
1) weighing 4-25 parts of iron ore fragments in parts by weight, and performing primary crushing and secondary crushing: grinding into coarse powder (5 mesh) by a hydraulic cone crusher, and grinding into fine powder (200 mesh) by a mechanical crusher for later use;
2) weighing 2-5 parts by weight of calcium hydroxide coarse powder, 12-21 parts by weight of sodium bicarbonate coarse powder, 2-5 parts by weight of calcium-based particle clay coarse powder and 40-65 parts by weight of amino reducing agent coarse powder, stirring and mixing, grinding into fine powder of 200 meshes by a mechanical grinder, mixing with the iron ore fine powder obtained in the first step, and grinding into superfine powder by a superfine impact grinder to obtain the dry-type denitration superfine powder.
Further, the grinding temperature of the ultramicro impact pulverizer is lower than 30 ℃.
The invention discloses application of dry-type denitration ultramicro powder for synergistically realizing ultralow emission, which is applied to the field of flue gas denitration.
Further, the method is used for flue gas purification and denitration treatment of coal-fired boilers, kilns, power station boilers and biomass boilers.
Further, the denitration ultramicro powder is sprayed into a 600-1000 ℃ temperature area of a hearth main combustion area according to the proportion that the ammonia nitrogen molecular weight ratio is 0.5:1, and water vapor or water mist with the material volume flow rate of more than 3% at one hundred ℃ is sprayed into a denitration ultramicro powder spraying port.
In order to adjust the pH value of the denitration ultramicro powder sprayed into the hearth, solid crystalline oxygen in the denitration ultramicro powder is sprayed into a high-temperature region of the hearth by spraying a small amount of water vapor or water mist at one hundred ℃, so that the solid crystalline oxygen is converted into active oxygen, and the active oxygen is easily decomposed to form hydroxyl radical (OH-) after being oxidized into an excited state, so that the yield of OH < - > is improved along with the increase of the pH value.
Further, the optimal temperature of the main combustion area of the hearth is 800-900 ℃; the optimum flow rate of flue gas is 15 meters per second.
The technical principle of the invention is as follows:
the micron amino reducing agent and calcium hydroxide are mixed and sprayed into the hearth to be quickly decomposed and gasified after being heated to generate high-activity ammonia gas and high-activity ammonia gas (NH)3) With NO and NO in the flue gas2The components are fully mixed and form a gas phase reaction, namely a gas-gas reaction, the reaction products are water, nitrogen and trace mineral salt, the products are nontoxic, harmless and pollution-free, the reaction is rapid and thorough, and the denitration rate can be greatly improved. The reaction formula is as follows:
Ca(OH)2+CO(NH2)2＝CaCO3+2NH3；2NH3+NO+NO2＝2H2O+N2。
in addition, hematite ore in iron ore contains iron as main component 55%, small amount of acid gas eliminating components such as calcium, magnesium, manganese, titanium, etc. and solid oxygen 30%, i.e. naturally formed solid crystal oxygen, which is crystal of oxygen and potentially important active oxygen, and is formed by losing one electron from hydroxyl radical (OH-) in view of molecular formula, i.e. hydroxyl radical. It has strong capability of oxidizing and decomposing harmful gases such as nitrogen oxide, and is a super oxidant which is second only to fluorine and is discharged at the second place in nature. Ammonia gas (NH) after gasification of hydroxyl radicals and micron amino reducing agents3) Under the synergistic effect, the catalyst has extremely strong removal effects of oxidation, decomposition, adsorption, neutralization reaction and the like on NOx gas.
In order to further improve the denitration effect of the hematite, the invention adds the pyrite ultra-fine powder and the siderite ultra-fine powder on the basis of the original hematite ultra-fine powder. The characteristic that Fe (II) sites on the surface of the pyrite superfine powder are easy to generate hydroxyl free radicals with high active oxygen is utilized, the Fe (II) sites and the hematite superfine powder are mixed, the characteristic that the hematite contains a large amount of active oxygen is utilized, the Fe (II) sites and the hematite superfine powder react with the pyrite superfine powder, and the hematite superfine powder contains a proper amount of ferrous iron, so that a proper amount of reaction precursor substances can be provided, and the reaction is accelerated. The added siderite ultrafine powder contains a proper amount of carbonate, so that the amount of hydroxyl free radicals generated by the reaction is greatly increased, and the reaction rate is accelerated. After the denitration ultra-fine powder containing hematite, pyrite and siderite is mixed with steam with the temperature of over one hundred ℃, hydroxyl free radicals are instantly generated and sprayed to a main combustion area of a hearth, and the effects of oxidation, decomposition and adsorption are achieved to remove nitrogen oxides.
The reaction mechanism is as follows:
when high active oxygen in hematite is used as an oxidant for the reaction of the pyrite superfine powder, the active oxygen gradually obtains 4 electrons at Fe (II) sites on the surface of the pyrite superfine powder and is reduced into water molecules, and the specific process is as follows: oxygen gets 1 electron from Fe (II) site and is reduced to superoxide radical (. O)2-，)，·O2-and H+Generation of binding H2O2。H2O2Getting 1 electron from Fe (II) site to generate adsorption state OH and releasing OH-(hydroxyl free radical), finally the adsorbed OH and the pyrite ultra-fine powder generate strong oxidation reaction to release OH-(as in equation 1). The rate of oxygen oxidation of pyrite with O2Increase in concentration or pH. Under acidic conditions, O2Directly obtaining electrons from the surface of the pyrite superfine powder to be reduced into H2O。
The reaction process is simply shown as follows:
pyrite micropowder → Fe (II) → O2→ pyrite micropowder → Fe (III) →. O2 -(1)。
In the denitration process, the method comprises the following steps: the hearth temperature has great influence on the denitration rate of the denitration ultrafine powder, 600-1000 ℃ is effective denitration reaction temperature, and is inversely proportional to the denitration rate when the temperature is raised to 1000 ℃ upwards, and is proportional to the denitration rate when the temperature is lowered to 600 ℃. Under the condition that the length of a boiler flue is fixed, the faster the flue gas flow speed is, the lower the denitration rate is, because the ammonia nitrogen reaction time is short and the reaction is insufficient, and on the contrary, the slower the flue gas flow speed is, the more the ammonia nitrogen reaction is sufficient, and the denitration rate is higher. The fineness of the denitration superfine powder determines the denitration rate, and 1340-2000 meshes are effective denitration grain sizes. The larger the particle size, the inversely proportional to the denitration rate.
The hydroxyl free radicals formed by decomposing the denitration ultramicro powder have the following characteristics:
1. the hydroxyl radical has extremely strong oxidation capacity, has extremely high oxidation potential of 2.80V, and is just next to fluorine in nature to rank the second super oxide;
2. the reaction rate constant is large and very active;
3. low selectivity to the reactant species and independent of reactant concentration;
4. hydroxyl radicals are highly reactive and are degraded to harmless substances by direct interaction with various organic or inorganic compounds, mainly through electron transfer, electrophilic addition, dehydrogenation reactions and the like, without choice.
5. Can generate rapid chain reaction with most organic pollutants and inorganic pollutants, and can oxidize harmful substances into CO without selectivity2、H2O and trace mineral salts or nitrogen, and has no secondary pollution.
The calcium-based granular clay (sodium-based granular clay is not selected) is nontoxic, tasteless, corrosion-free and pollution-free, has catalytic cracking and removal of acidic nitrogen oxides, has adsorption activity and high adsorption speed, and can simultaneously play a role in enhancing the flowability of powder. Can increase the adsorption effect and remove the odor of ammonia gas.
Micron reducing agent (ammonium carbamate synthesized by carbon dioxide and ammonia in high temperature and high pressure container, after decomposition, absorption and conversion, crystallization, separation and drying), and micron reducing agent (calcium hydroxide) is sprayed into furnace chamber and gasified at high temperature to form high activity ammonia gas (NH)3) Both with NO and NO2Reaction of ammonia with strippingUnder the synergistic effect of hydroxyl free radicals formed by decomposition of solid oxygen in hematite in the ultrafine denitration powder under certain conditions, the denitration rate can be obviously improved, the average denitration rate reaches 96 percent, the highest denitration rate can reach 98 percent, and because the mixed molecular weight of the ultrafine denitration powder is 60, 95 percent of nitrogen oxide is NO (the molecular weight is 30) and 5 percent of nitrogen oxide is NO2(molecular weight 46), the mixed molecular weight of the two is approximately equal to 30.8. As is clear from the above, since the mixed molecular weight of the ultrafine denitration powder is 60 and the mixed molecular weight of the nitrogen oxide is 30.8, 0.5 ultrafine denitration powder corresponds to 1 nitrogen oxide, which means that a large amount of nitrogen oxide can be removed by using a small amount of the ultrafine denitration powder. Therefore, the dosage and the cost of the denitration ultramicro powder are greatly reduced.
Hematite micropowder (containing pyrite micropowder and siderite micropowder) contains 55% of iron as main ingredient, small amount of adsorbent and oxidant such as calcium, magnesium, manganese and titanium, and 30% of naturally-formed solid crystalline oxygen, which is crystal of oxygen and is a potentially important high-activity oxygen, and is composed of hydroxide radical (OH) in view of molecular formula-) The high active oxygen which loses an electron to form is decomposed to form hydroxyl free radical under certain conditions, and then has extremely strong capability of oxidizing and decomposing harmful gases such as nitrogen oxide and the like, and is a super oxidant which is discharged at the second place in nature.
The invention has the following beneficial effects:
the denitration ultramicro powder contains calcium-based granular argil, is nontoxic, tasteless, corrosion-free and pollution-free, is catalytically cracked and removed of acidic oxides, has adsorption activity and high adsorption speed, and can simultaneously play a role in enhancing the flowability of powder. Can enhance the adsorption effect and remove the odor of ammonia gas.
The micron amino reducing agent is sprayed into a hearth to form ammonia gas (NH) when the micron amino reducing agent is gasified at high temperature3) Both with NO and NO2The denitration rate can be obviously improved under the synergistic effect of hydroxyl radicals formed by decomposition of the denitration ultrafine powder under certain conditions, so that the average denitration rate reaches 96%, and the highest denitration rate reaches 98%. Since the mixed molecular weight of the ultrafine denitration powder is 60 and the mixed molecular weight of the nitrogen oxide is 30.8, the method has the advantages of high efficiency, low cost and low costTherefore, more nitrogen oxides can be removed by using less denitration ultramicro powder, and the operation cost of denitration is greatly reduced.
The denitration ultramicro powder is convenient to manufacture, when in application, the denitration ultramicro powder is mainly sprayed to a main combustion area of a boiler through a powder pneumatic conveying complete equipment, so that an ultralow emission effect can be stably achieved for a long time, and water, nitrogen and trace mineral salt microparticles exist in a product after denitration of the denitration ultramicro powder, so that the denitration ultramicro powder has no influence on normal use of a cloth bag of a dust collector.
Detailed Description
The beneficial effects of the present invention are demonstrated by the following examples:
example 1:
the dry-type denitration superfine powder for synergistically realizing ultralow emission of flue gas comprises the following components:
iron ore; the iron ore is prepared by mixing hematite, pyrite and siderite according to the mass ratio of 5:3: 2.
Example 2:
the dry-type denitration superfine powder for synergistically realizing ultralow emission of flue gas comprises the following components:
example 3:
the dry-type denitration superfine powder for synergistically realizing ultralow emission of flue gas comprises the following components:
iron ore; the iron ore is prepared by mixing hematite, pyrite and siderite according to the mass ratio of 5:3: 2.
The method for producing the ultrafine denitration powder of the above embodiment is carried out according to the following steps:
weighing iron ore fragments, and grinding the iron ore fragments into fine powder (200 meshes: 75 microns) through a primary crushing (European jaw crusher), a secondary crushing (hydraulic cone crusher), a pre-grinding bin, a vibration feeder and a mechanical crusher for later use;
wherein the iron ores of the embodiments 2 and 3 are formed by mixing hematite, pyrite and siderite, and the mass ratio of the hematite fine powder, the pyrite fine powder and the siderite fine powder is 5:3: 2;
and secondly, weighing calcium hydroxide, sodium bicarbonate, calcium-based particle clay and an amino reducing agent, stirring and mixing, grinding into coarse powder (5 meshes) by using a hydraulic cone crusher, grinding into fine powder (200 meshes are equal to 75 microns) by using a mechanical grinder, stirring and mixing with the iron ore fine powder obtained in the first step, and grinding into superfine powder by using a superfine impact grinder to obtain the dry-type denitration superfine powder, wherein the particle size of the superfine powder is 10-6.5 microns, namely 1340-2000 meshes.
Because the micron amino reducing agent and the sodium bicarbonate are both crystals and have light specific gravity, when the micron amino reducing agent and the sodium bicarbonate are crushed to 1340 meshes, the micron amino reducing agent and the sodium bicarbonate are blown into the dust removal collector together with the calcium hydroxide, the calcium-based particle clay and the iron ore which are crushed to 1800 meshes by air separation.
The process flow of the hematite (containing pyrite and siderite) ultra-fine powder crushing in the embodiment is as follows:
1) and (3) initially crushing, namely crushing 35-50 mm hematite by using an European jaw crusher. The working principle is as follows:
the forklift is loaded to a feeding hole of the crusher, the motor drives the belt and the belt pulley, the movable jaw swings forwards and backwards and upwards through the eccentric shaft, and when the movable jaw pushes the movable jaw to move towards the jaw-fixed plate, the material is crushed or split. When the jaw and the jaw plate are retreated under the action of the eccentric shaft and the spring, the hematite ore which is crushed or split is discharged from the lower discharge port of the jaw plate. The crusher can periodically crush and discharge the fine stone along with the continuous rotation of the motor, thereby realizing continuous batch production. The specification of the discharge port is 5-10 mm;
2) and secondly, further crushing 5-10 mm hematite ore by using a hydraulic cone crusher. The working principle is as follows:
when the hydraulic cone crusher works, the motor drives the eccentric sleeve to rotate through the triangular belt, the transmission shaft and the bevel gear, and the movable cone performs rotary swing motion under the action of the eccentric sleeve to enable the movable cone and the fixed cone to approach each other or deviate from each other. The stone is crushed in the crushing chamber by being continuously pressed and impacted, and the crushed hematite stone is discharged from the lower part. The minimum discharge specification 5 mesh-4000 micron coarse powder.
3) And (3) a powder cabin before grinding, and conveying the coarse powder with the 5-mesh-4000-micrometer size obtained after secondary crushing to the powder cabin before grinding.
4) And conveying the powder from the pre-grinding powder bin to a vibrating feeder, also called a vibrating feeder. The device is used for uniformly, continuously or quantitatively feeding powdery materials from a pre-grinding powder bin to a feeding hole of a mechanical pulverizer in a production flow. The mill was continuously and uniformly fed and the material was initially sieved to a fine powder (200 mesh 75 microns).
5) An ultramicro impact pulverizer and a working principle:
the five kinds of fine powder are sucked into an ultramicro impact pulverizer to be pulverized, and the ultrafine impact pulverizer, a cyclone separator, a dust removal collector and a draught fan form a whole set of ultramicro pulverizing system. The high-speed rotating crushing disc and the gear ring form a shearing crushing area when colliding, materials are crushed in the crushing area under the superposition of a plurality of crushing forces such as friction, shearing, collision and the like, the crushed materials are thrown upwards to a grading area along with the attraction of ascending air flow under the action of the attraction of an induced draft fan, under the action of strong centrifugal force generated by a grading turbine rotating at high speed, the coarse and fine materials are separated, the denitration superfine powder meeting the particle size requirement enters a cyclone separator or a dust removal collector through a grading wheel, and the coarse particles descend to the crushing area to be continuously crushed until the denitration superfine powder (10 micrometers-6.5 micrometers which are 1340 meshes-2000 meshes) is formed.
The hematite ore has an iron content of 55% and an oxygen content of more than 30%, and the main production areas are Hebei, Henan, Shanxi, Shandong, Hunan, Guangdong, Sichuan and the like. Oolitic hematite ore containing quartz can be selected as the raw material.
The components are proportioned according to the formula in the embodiments 1-3, and are crushed together or respectively to prepare the denitration ultra-fine powder A1, A2 and A3.
Because the specific gravity of each component is different, in order to ensure that each component of the denitration ultramicro powder can be synchronously sprayed into a proper temperature area of a hearth, the uniform particle size and specific gravity of each component need to be ensured, and therefore, the particle size of each component needs to be distinguished.
A1 is the denitration ultra-fine powder prepared according to the mixture ratio in the embodiment 1, and the optimal particle size of each component is as follows:
a2 is the denitration ultra-fine powder prepared according to the mixture ratio in the embodiment 2, and the optimal particle size of each component is as follows:
a3 is the denitration ultra-fine powder prepared according to the mixture ratio in the embodiment 3, and the optimal particle size of each component is as follows:
respectively spraying the A1, A2 and A3 with the optimal grain size of the denitration ultra-fine powder to a proper temperature area of a boiler hearth by using pneumatic conveying complete equipment through a pipeline. The pneumatic conveying equipment realizes the standardization and modularization of equipment manufacturing and the automation and intellectualization (PLC combined on-line monitor) of equipment operation for the first time, realizes the automatic feeding, automatic stirring, automatic crushing, automatic conveying, automatic monitoring and intelligent control of the injection amount of the desulfurized ultrafine powder, and realizes the long-term stable ultra-low emission.
The initial emission of the denitration ultra-fine powder provided in example 1 is used as an experimental group, the emission value after removing nitrogen oxides in flue gas in a hearth is used as a control group, parameters of the nitrogen oxides before and after denitration by A1, A2 and A3 are adopted, and the comparison table is shown in the following table 1:
table 1: table for comparing emission values of nitrogen oxides before and after denitration
| A1 | A2 | A3 | Control denitration mean | |
| NOXInitial emission value (mg/Nm)3) | 580 | 550 | 520 | 550 |
| Denitrated NOXEmission value (mg/Nm)3) | 10 | 20 | 30 | 20 |
| Denitration rate (%) | 98 | 96 | 94 | 96 |
From top to bottomIt can be seen that, after denitration, the emission values of nitrogen oxides in the flue gas treated by the method of the above embodiment are all lower than the ultra-low emission standard specified by the current environmental protection act. The specific standard is as follows: 35mg/Nm of sulfur dioxide3Nitrogen oxides 50mg/Nm3Dust 10mg/Nm3。
After the denitration treatment by the method of the embodiment, the average denitration rate reaches 96%, the highest denitration rate reaches 98%, and compared with the existing commonly used SCR technology and SNCR combined denitration technology, the denitration rate is improved to some extent, and the ultralow emission is achieved.
Engineering cases: the boiler flue gas dry denitration superfine powder consumption and cost calculation process comprises the following steps:
2x100 tons/h stoker furnace, initial emission value of NOx concentration 550 mg standard cubic meter,
after denitration, the content is reduced to below 20 mg per cubic unit (the sale price of the denitration ultra-fine powder is 2300 yuan/ton)
Calculating the consumption amount and the operating cost of the denitration superfine powder:
flue gas amount: 220000Nm3/h
Mass of NOx to be removed:
220000 × (550-20) ÷ 1000000 ═ 116kg of nitroxide
The molecular weight of the denitration ultramicro powder is 60, and 0.5 denitration ultramicro powder corresponds to 1 NOx (molecular weight is 30.8)
The weight of the denitration superfine powder consumed in hours: 116kg × 60 × 0.5 ÷ 30.8 ÷ 112kg/h
Consuming the amount of the denitration superfine powder in hours: 112kg × 2.3 yuan 257 yuan/h
Daily consumption of denitration ultra-fine powder weight: 112kg × 24h 2.7 t/day
Daily consumption of the amount of the denitration ultrafine powder: 2.7t × 2300 yuan 6210 yuan/day
Monthly consumption of denitration ultra-fine powder weight: 2.7t × 30 days 81 t/month
Monthly consumption of the amount of the denitration ultrafine powder: 81t x 2300 yuan ═ 18 ten thousand yuan/month
Note: (assuming 24 hours of continuous full load operation of the boiler).
According to the calculation, the 100t/h chain boiler only consumes 112kg of denitration ultrafine powder in one hour, the cost is only 257 yuan, and the cost is reduced by a lot compared with the conventional SCR technology and SNCR wet denitration technology. The denitration ultramicro powder of this embodiment still reduces the consumption of denitration ultramicro powder when reaching the minimum discharge, has reduced the running cost of denitration.
The above-mentioned embodiments are only preferred embodiments, and the protection scope is not limited thereto, and any person skilled in the art can make various substitutions or changes according to the technical solution and idea of the present invention without departing from the scope of the technical idea of the present invention, which belongs to the protection scope of the present invention.
In summary, the invention has the advantages of high denitration rate, less equipment investment, low operation cost, simple process, small occupied area, easy realization of ultralow emission and no secondary pollution. The user can set the target value of the nitrogen oxide emission on a computer optionally according to the requirement, and the nitrogen oxide emission can be high or low. The denitration ultramicro powder realizes standardization and modularization of denitration equipment manufacturing and automation and intellectualization of equipment operation, and is a preferred technical scheme for boiler flue gas treatment in the future.
Claims (10)
1. The dry type desulfurization superfine powder is characterized in that the solid superfine powder consists of 40-65 parts by weight of a mixture of sodium bicarbonate and calcium hydroxide, 3-5 parts by weight of magnesium stearate, 2-5 parts by weight of calcium-based particle clay and 10-30 parts by weight of iron ore.
2. The dry-type desulfurization ultra-fine powder for synergistically realizing ultra-low emission of flue gas according to claim 1, characterized in that the iron ore contains 40% -65% of hematite iron and more than 30% of oxygen, wherein the hematite is prepared by grinding into ultra-fine powder through a primary crushing bin, a secondary crushing bin and a pre-grinding bin and utilizing a vibrating feeder, a mechanical crusher and an ultra-fine impact crusher.
3. The dry-type desulfurization ultra-fine powder for synergistically realizing ultra-low emission of flue gas according to claim 1 or 2, characterized in that the iron ore is prepared by mixing hematite, pyrite and siderite, wherein after the hematite fragments with the iron content of 50% -65% and the oxygen content of more than 30% are mixed with the pyrite fragments and the siderite fragments, the mixture is subjected to primary crushing, secondary crushing and pre-grinding, and is ground into ultra-fine powder by using a vibrating feeder, a mechanical grinder and an ultra-fine impact grinder; wherein the mass ratio of the hematite, the pyrite and the siderite is 5:3: 2.
4. The dry-type desulfurization ultra-fine powder for synergistically realizing ultra-low emission of flue gas according to claim 1 or 2, characterized in that iron element accounts for 55% by mass, oxygen content accounts for 30% by mass, and the balance is adsorbent and oxidant; wherein, the adsorbent and the oxidant are one or more of calcium oxide, magnesium oxide, manganese dioxide and titanium dioxide.
5. The method for manufacturing the dry desulfurization ultra-fine powder for realizing the ultra-low emission of flue gas synergistically according to claim 1 is characterized by comprising the following steps of:
weighing 10-30 parts of iron ore fragments in parts by weight, passing the iron ore fragments through a primary crushing bin, a secondary crushing bin and a pre-grinding bin, and grinding the iron ore fragments into fine powder through a vibrating feeder and a mechanical grinder for later use;
weighing 40-65 parts of a mixture of sodium bicarbonate fine powder and calcium hydroxide fine powder, 3-5 parts of magnesium stearate fine powder and 2-5 parts of calcium-based particle clay fine powder according to parts by weight for later use; wherein the mass ratio of the sodium bicarbonate fine powder to the calcium hydroxide fine powder is 10: 2;
and thirdly, conveying the mixture of the sodium bicarbonate and the calcium hydroxide, the magnesium stearate, the calcium-based granular argil and the iron ore fine powder into a high-speed stirrer at normal temperature and normal pressure, uniformly mixing and stirring, and grinding into superfine powder by a superfine impact grinder to obtain the dry-type desulfurization superfine powder.
6. The method for preparing ultra-fine dry desulfurization powder capable of achieving ultra-low emission of flue gas synergistically according to claim 5, wherein the temperature of the grinding treatment of the ultra-fine impact pulverizer is less than 30 ℃.
7. The use of the ultrafine dry desulfurization powder for synergistically achieving ultra-low emission of flue gas according to claim 1, characterized in that it is used for desulfurization of flue gas.
8. The use according to claim 7, characterized in that it is used for the flue gas desulfurization purification treatment of coal-fired boilers, kilns, utility boilers.
9. The use of claim 8, characterized in that the ultra-fine desulfurization powder of claim 1 is sprayed into a burnout zone or a tail flue or a reactor of a hearth according to the ratio of sodium to sulfur of 1.2:1, and water vapor or water mist with the volume flow rate of 3 percent of the material volume flow rate of over one hundred ℃ is sprayed towards a spray port of the ultra-fine desulfurization powder.
10. The use according to claim 7 or 8, characterized in that the reaction temperature of the ultra fine desulfurization powder is 120 ℃ to 170 ℃ and the flue gas flow rate is 15 meters per second.
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