CN101816886A - Method for simultaneously desulfurating, denitrating and decarbonizing coal-fired flue gas - Google Patents
Method for simultaneously desulfurating, denitrating and decarbonizing coal-fired flue gas Download PDFInfo
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- CN101816886A CN101816886A CN201010159735A CN201010159735A CN101816886A CN 101816886 A CN101816886 A CN 101816886A CN 201010159735 A CN201010159735 A CN 201010159735A CN 201010159735 A CN201010159735 A CN 201010159735A CN 101816886 A CN101816886 A CN 101816886A
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- adsorbent
- flue
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 239000003546 flue gas Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000010521 absorption reaction Methods 0.000 claims abstract description 32
- 239000003463 adsorbent Substances 0.000 claims abstract description 22
- 239000007789 gas Substances 0.000 claims abstract description 15
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 14
- 238000001179 sorption measurement Methods 0.000 claims abstract description 13
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 11
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 9
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 claims abstract description 6
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000001099 ammonium carbonate Substances 0.000 claims abstract description 6
- 235000012501 ammonium carbonate Nutrition 0.000 claims abstract description 6
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims abstract description 6
- 235000011130 ammonium sulphate Nutrition 0.000 claims abstract description 6
- 238000003795 desorption Methods 0.000 claims description 22
- 230000000274 adsorptive effect Effects 0.000 claims description 21
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 18
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims description 18
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 239000002808 molecular sieve Substances 0.000 claims description 12
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 12
- 230000023556 desulfurization Effects 0.000 claims description 10
- 239000003595 mist Substances 0.000 claims description 10
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 9
- 238000005261 decarburization Methods 0.000 claims description 9
- 239000001569 carbon dioxide Substances 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- 229910021529 ammonia Inorganic materials 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 229910052783 alkali metal Inorganic materials 0.000 claims description 5
- 150000001340 alkali metals Chemical class 0.000 claims description 5
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 5
- 150000001342 alkaline earth metals Chemical class 0.000 claims description 5
- 230000003647 oxidation Effects 0.000 claims description 5
- 238000007254 oxidation reaction Methods 0.000 claims description 5
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 5
- 150000002910 rare earth metals Chemical class 0.000 claims description 5
- 229910052723 transition metal Inorganic materials 0.000 claims description 5
- 150000003624 transition metals Chemical class 0.000 claims description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 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 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 4
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 4
- 229910052788 barium Inorganic materials 0.000 claims description 4
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims description 4
- 229910052791 calcium Inorganic materials 0.000 claims description 4
- 239000011575 calcium Substances 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 229910052677 heulandite Inorganic materials 0.000 claims description 4
- 229910052746 lanthanum Inorganic materials 0.000 claims description 4
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 4
- 229910052749 magnesium Inorganic materials 0.000 claims description 4
- 239000011777 magnesium Substances 0.000 claims description 4
- 229910052700 potassium Inorganic materials 0.000 claims description 4
- 239000011591 potassium Substances 0.000 claims description 4
- 229910052708 sodium Inorganic materials 0.000 claims description 4
- 239000011734 sodium Substances 0.000 claims description 4
- 229910052684 Cerium Inorganic materials 0.000 claims description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 3
- 229910052908 analcime Inorganic materials 0.000 claims description 3
- 229910052792 caesium Inorganic materials 0.000 claims description 3
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 claims description 3
- 229910017052 cobalt Inorganic materials 0.000 claims description 3
- 239000010941 cobalt Substances 0.000 claims description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 3
- 230000006837 decompression Effects 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052737 gold Inorganic materials 0.000 claims description 3
- 239000010931 gold Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 229910052744 lithium Inorganic materials 0.000 claims description 3
- 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 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 229910052701 rubidium Inorganic materials 0.000 claims description 3
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 239000004332 silver Substances 0.000 claims description 3
- 229910052665 sodalite Inorganic materials 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 239000011701 zinc Substances 0.000 claims description 3
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 4
- 238000000746 purification Methods 0.000 abstract description 3
- 239000003245 coal Substances 0.000 abstract description 2
- 238000005262 decarbonization Methods 0.000 abstract description 2
- 239000002912 waste gas Substances 0.000 abstract description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 abstract 2
- 238000003723 Smelting Methods 0.000 abstract 1
- 238000001816 cooling Methods 0.000 abstract 1
- 238000004064 recycling Methods 0.000 abstract 1
- 230000008569 process Effects 0.000 description 5
- 229910002091 carbon monoxide Inorganic materials 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 4
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical class [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- 239000003905 agrochemical Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- ZMIGMASIKSOYAM-UHFFFAOYSA-N cerium Chemical compound [Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce] ZMIGMASIKSOYAM-UHFFFAOYSA-N 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 1
- 230000007420 reactivation Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Treating Waste Gases (AREA)
Abstract
The invention provides a method for simultaneously desulfurating, denitrating and decarbonizing coal-fired flue gas. The method comprises the following steps: dedusting and cooling the coal-fired flue gas containing SO2, NOx and CO2; leading the gas into an adsorbent for saturated adsorption at the adsorption temperature of 50-100 DEG C and the adsorption pressure of 50-10000Pa; evacuating the coal-fired flue gas, desorbing the adsorbent by means of pressure reduction or temperature rise, and then repeatedly using; leading the desorbed gas into ammonia water for absorption treatment, wherein, the mass ratio of the ammonia water to the mixed gas containing SO2, NOx and CO2 is 2-6:1, the absorption temperature is 30-50 DEG C, and the absorption pressure is 5000-12000Pa; and recycling the gas to generate ammonium sulfate, ammonium nitrate and ammonium carbonate. The method can achieve simultaneouse desulfuration, denitration and decarbonization, and has small investment, low cost and low energy consumption; and the method can be widely applied to purification treatment of SO2, NOx and CO2 in the waste gas discharged from fixed fire coal sources such as thermal power plants, smelting plants, oil refinery, chemical plants and the like.
Description
Technical field
The present invention relates to the method for the desulfurization simultaneously of a kind of coal-fired flue-gas, denitration and decarburization, belong to atmosphere pollution purification techniques field.
Background technology
By SO
2And NO
XThe acid rain and the CO that cause Deng acid-causing substance
2The greenhouse effects that isothermal chamber gas causes are global atmosphere environmental problems of common concern in the world.70% CO2 emission in the air, 90% sulfur dioxide (SO2) emissions and 67% discharged nitrous oxides are the uses that comes from fossil fuel.In view of China is the main one-time-consumption energy with coal, the key of control coal-fired flue-gas discharging becoming protection atmospheric environment.
The method of flue gas simultaneous desulfurization, denitration has liquid phase absorption process, electron beam irradiation method etc. at present, all has the shortcoming that once investment is big, operating cost is high.The method of the industrial application of decarburization also is absorbed as the master with liquid phase, has the huge shortcoming of energy consumption.And the method for sloughing sulphur in the flue gas, nitre and carbon does not simultaneously also have mature technique.
Summary of the invention
Be shortcoming such as the method that overcomes desulfurization, denitration is once invested greatly, operating cost is high and the decarbonization method energy consumption is huge, the present invention proposes the purification method of the desulfurization simultaneously of a kind of coal-fired flue-gas, denitration and decarburization, it is realized by following technical proposal, to reach the purpose that cost is low, efficient is high:
The method of the desulfurization simultaneously of a kind of coal-fired flue-gas, denitration and decarburization is characterized in that through the following step:
A. will contain SO
2, NO
xAnd CO
2Coal-fired flue-gas carry out dedusting;
B. again the flue-gas temperature after the dedusting is reduced to 10～100 ℃, and flue gas fed in the adsorbent, at adsorption temp is 50～100 ℃, adsorptive pressure is to be adsorbed to saturatedly under the condition of 50～10000Pa, and adsorbent is one or more the molecular sieve that is equipped with in alkali metal, alkaline-earth metal, transition metal or the rare earth metal;
C. the flue tail gas that is adsorbed to after saturated through step B directly is discharged in the atmosphere, is adsorbed to saturated adsorbent decompression or heats up, and makes the SO of absorption
2, NO
xAnd CO
2The mist desorption, the adsorbent behind the desorption is recycled;
D. will the gas behind the desorption feed in the ammoniacal liquor and absorb processing, ammonia volume with contain SO
2, NO
xAnd CO
2The mass ratio of mist be 2～6: 1, absorbing temperature is 30～50 ℃, absorption pressure is 5000～12000Pa;
E. step D being absorbed the ammonium sulfate, ammonium nitrate, the ammonium carbonate that generate recycles.
The dedusting of described steps A is conventional bag-type dust or electric precipitation, or other dedusting.
Described step B absorption be such: when adsorptive pressure is 50～200Pa, first adsorption and oxidation nitrogen, when adsorptive pressure is 100～500Pa absorption sulfur dioxide, absorbing carbon dioxide when adsorptive pressure is 5000～10000Pa.
The molecular sieve of described step B is X type, Y type, A type, ZSM-5 type, modenite, chabasie, analcime, sodalite or heulandite molecular sieve.
The alkali metal that the molecular sieve of described step B uses is in lithium, sodium, potassium, rubidium, the caesium one or more; Alkaline-earth metal is one or more in calcium, magnesium, the barium; Transition metal is one or more in copper, cobalt, manganese, iron, nickel, zinc, the gold, silver; Rare earth metal is one or more in lanthanum, the cerium.
The desorption of described step C is conventional decompression desorption or desorption by heating.
NO in the described coal-fired flue-gas
xFor NO or/and NO
2
Effect of the present invention and advantage: SO
2, NO
xAnd CO
2Removing process simple, be easy to control, efficient is good.Owing to when using identical adsorbents adsorb, only, promptly increase gradually, can adsorb sulfur dioxide, nitrogen oxide (NO successively by the change of adsorptive pressure
XIn 90% content be NO, and NO
2Relatively NO has the character that better is adsorbed, processed easily), and carbon dioxide, sulphur, nitrogen, carbon in the coal-fired flue-gas are removed simultaneously, lower energy consumption to greatest extent, desorption after the absorption is easy, and the adsorbent reactivation performance is good, can use repeatedly, removal efficiency height not only, and invest for a short time, and cost is low, energy consumption is little, and method provided by the invention is widely used in SO in the coal-fired institute of stationary sources such as steam power plant, smeltery, oil plant, the chemical plant discharging waste gas
2, NO
xAnd CO
2Purified treatment, the sulfur dioxide in the coal-fired flue-gas, nitrogen oxide and carbon dioxide enter ammoniacal liquor liquid phase absorption system again after adsorbing separation is purified, can utilize ammonia to absorb that carbon dioxide prepares the carbonic hydroammonium agrochemical in the coal-fired flue-gas.Because ammoniacal liquor can effectively absorb above-mentioned three kinds of sour gas, can prepare compound agrochemical by technique improvement, will solve gaseous contamination problem and chemical fertilizer production problem effectively, reaches the purpose of doulbe-sides' victory.
The specific embodiment
Below in conjunction with embodiment the present invention is described further.
Embodiment 1
A. will contain SO
2, NO and CO
2Coal-fired flue-gas carry out bag-type dust;
B. the flue-gas temperature of above-mentioned steps A dedusting is reduced to 90 ℃, and flue gas fed be equipped with in the X type molecular sieve of potassium, calcium, copper adsorbent, at adsorption temp is 70 ℃, adsorptive pressure is increased to gradually by 50Pa in the process of 10000Pa and adsorbs, that is: when adsorptive pressure was 50～200Pa, first adsorption and oxidation nitrogen adsorbed sulfur dioxide when adsorptive pressure is 100～500Pa, absorbing carbon dioxide when adsorptive pressure is 5000～10000Pa is saturated until absorption;
C. the step B absorption flue tail gas after saturated directly is discharged in the atmosphere, with the saturated adsorbent of the absorption desorption that reduces pressure routinely, makes the SO of absorption
2, NO and CO
2The mist desorption, the adsorbent behind the desorption is recycled;
D. will the gas behind the step C desorption feed in the ammoniacal liquor and absorb processing, ammonia volume with contain SO
2, NO and CO
2The mass ratio of mist be 2: 1, absorbing temperature is 50 ℃, absorption pressure is 8000Pa;
E. ammonium sulfate, ammonium nitrate, the ammonium carbonate that step D absorption finishing back is generated recycled.
SO among this embodiment
2, NO and CO
2Removal efficiency be respectively: 80%, 20%, 50%.
Embodiment 2
A. will contain SO
2, NO, NO
2And CO
2Coal-fired flue-gas carry out electric precipitation;
B. will reduce to 10 ℃ through the flue-gas temperature of steps A dedusting, and flue gas fed be equipped with in the type ZSM 5 molecular sieve of sodium, magnesium, lanthanum adsorbent, at adsorption temp is 100 ℃, adsorptive pressure is increased to gradually by 50Pa in the process of 10000Pa and adsorbs, that is: when adsorptive pressure was 50～200Pa, first adsorption and oxidation nitrogen adsorbed sulfur dioxide when adsorptive pressure is 100～500Pa, absorbing carbon dioxide when adsorptive pressure is 5000～10000Pa is saturated until absorption;
C. the step B absorption flue tail gas after saturated directly is discharged in the atmosphere, and the saturated adsorbent of absorption is carried out desorption by heating routinely, makes the SO of absorption
2, NO, NO
2And CO
2The mist desorption, the adsorbent behind the desorption is recycled;
D. will the gas behind the step C desorption feed in the ammoniacal liquor and absorb processing, ammonia volume with contain SO
2, NO, NO
2And CO
2The mass ratio of mist be 4: 1, absorbing temperature is 30 ℃, absorption pressure is 12000Pa;
E. ammonium sulfate, ammonium nitrate, the ammonium carbonate that step D absorption finishing back is generated recycled.
SO among this embodiment
2, NO
xAnd CO
2Removal efficiency be respectively: 89%, 32%, 56%.
Embodiment 3
A. will contain SO
2, NO, NO
2And CO
2Coal-fired flue-gas carry out electric precipitation;
B. will reduce to 60 ℃ through the flue-gas temperature of steps A dedusting, and flue gas fed be equipped with in the heulandite molecular sieve of barium adsorbent, at adsorption temp is 50 ℃, adsorptive pressure is increased to gradually by 50Pa in the process of 10000Pa and adsorbs, that is: when adsorptive pressure was 50～200Pa, first adsorption and oxidation nitrogen adsorbed sulfur dioxide when adsorptive pressure is 100～500Pa, absorbing carbon dioxide when adsorptive pressure is 5000～10000Pa is saturated until absorption;
C. the step B absorption flue tail gas after saturated directly is discharged in the atmosphere, with the saturated adsorbent of the absorption desorption that reduces pressure routinely, makes the SO of absorption
2, NO, NO
2And CO
2The mist desorption, the adsorbent behind the desorption is recycled;
D. will the gas behind the step C desorption feed in the ammoniacal liquor and absorb processing, ammonia volume with contain SO
2, NO, NO
2And CO
2The mass ratio of mist be 6: 1, absorbing temperature is 40 ℃, absorption pressure is 5000Pa;
E. ammonium sulfate, ammonium nitrate, the ammonium carbonate that step D absorption finishing back is generated recycled.
SO among this embodiment
2, NO
xAnd CO
2Removal efficiency be respectively: 76%, 38%, 60%.
The invention is not restricted to above embodiment, adsorbent can correspondingly replace with X type, Y type, A type, ZSM-5 type, modenite, chabasie, analcime, sodalite or the heulandite molecular sieve that one or more are housed in alkali metal (lithium, sodium, potassium, rubidium, caesium), alkaline-earth metal (calcium, magnesium, barium), transition metal (copper, cobalt, manganese, iron, nickel, zinc, gold, silver) or the rare earth metal (lanthanum, cerium).
Claims (4)
1. the method for coal-fired flue-gas desulfurization simultaneously, denitration and decarburization is characterized in that through the following step:
A. will contain SO
2, NO
xAnd CO
2Coal-fired flue-gas carry out dedusting;
B. again the flue-gas temperature after the dedusting is reduced to 10～100 ℃, and flue gas fed in the adsorbent, at adsorption temp is 50～100 ℃, adsorptive pressure is to be adsorbed to saturatedly under the condition of 50～10000Pa, and adsorbent is one or more the molecular sieve that is equipped with in alkali metal, alkaline-earth metal, transition metal or the rare earth metal;
C. the flue tail gas that is adsorbed to after saturated through step B directly is discharged in the atmosphere, is adsorbed to saturated adsorbent decompression or heats up, and makes the SO of absorption
2, NO
xAnd CO
2The mist desorption, the adsorbent behind the desorption is recycled;
D. will the gas behind the desorption feed in the ammoniacal liquor and absorb processing, ammonia volume with contain SO
2, NO
xAnd CO
2The mass ratio of mist be 2～6: 1, absorbing temperature is 30～50 ℃, absorption pressure is 5000～12000Pa;
E. step D being absorbed the ammonium sulfate, ammonium nitrate, the ammonium carbonate that generate recycles.
2. the method for while desulfurization according to claim 1, denitration and decarburization, it is characterized in that: described step B absorption be such: when adsorptive pressure is 50～200Pa, elder generation's adsorption and oxidation nitrogen, absorption sulfur dioxide when adsorptive pressure is 100～500Pa, absorbing carbon dioxide when adsorptive pressure is 5000～10000Pa.
3. the method for while desulfurization according to claim 1, denitration and decarburization is characterized in that: described molecular sieve is X type, Y type, A type, ZSM-5 type, modenite, chabasie, analcime, sodalite or heulandite molecular sieve.
4. the method for while desulfurization according to claim 1, denitration and decarburization is characterized in that: the alkali metal that the molecular sieve of described step B uses is in lithium, sodium, potassium, rubidium, the caesium one or more; Alkaline-earth metal is one or more in calcium, magnesium, the barium; Transition metal is one or more in copper, cobalt, manganese, iron, nickel, zinc, the gold, silver; Rare earth metal is one or more in lanthanum, the cerium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101597350A CN101816886B (en) | 2010-04-29 | 2010-04-29 | Method for simultaneously desulfurating, denitrating and decarbonizing coal-fired flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101597350A CN101816886B (en) | 2010-04-29 | 2010-04-29 | Method for simultaneously desulfurating, denitrating and decarbonizing coal-fired flue gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101816886A true CN101816886A (en) | 2010-09-01 |
| CN101816886B CN101816886B (en) | 2012-01-25 |
Family
ID=42652252
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101597350A Expired - Fee Related CN101816886B (en) | 2010-04-29 | 2010-04-29 | Method for simultaneously desulfurating, denitrating and decarbonizing coal-fired flue gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101816886B (en) |
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| CN106914214B (en) * | 2017-03-15 | 2019-08-16 | 中国科学院上海高等研究院 | Gas cleaning adsorbent and reclamation of salinep-alkali soil method for the reclamation of salinep-alkali soil |
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