• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
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    • 专利摘要:
    1413684 Removing sulphur oxides from gases MITSUBISHI JUKOGYO KK 13 Nov 1972 [11 Nov 1971] 52302/72 Heading C1A In a method for the removal of sulphur oxides from effluent gas using a calciferous wash liquor from which a calcium sulphate slurry is formed by oxidation, the supernatant liquid from the slurry is filtered to remove metal containing impurities arising from the dust in the gas, and also from the wash liquor, and the carbon dust collected from the gas is utilized as nuclei for flocculation of metal hydroxides prior to said filtration. The process may be continuous, with the above filtrate being recycled, thus eliminating the need for waste disposal.
    公开号:SU795448A3
    申请号:SU721847379
    申请日:1972-11-10
    公开日:1981-01-07
    发明作者:Ацукава Масуми；Синода Наохару；Кувобара Харуо
    申请人:Мицубиси Дзукогио Кабусики Кайся (Фирма)；
    IPC主号:
    专利说明:

    (54) METHOD FOR CLEANING EXHAUST GAS FROM SOJ
    The present invention relates to a method for purifying waste gases from the SOj with a lime method with obtaining gypsum as a marketable product.
    Known limestone methods for cleaning waste gases from SOj are based on the absorption of 50 lime suspension.
    All these methods do not allow the filtrate to be recycled. That is, they do not allow the process to be closed. In most cases, the resulting gypsum is highly contaminated and does not find application.
    The closest to the present invention in technical essence and the achieved result is a method of cleaning exhaust gases from SO with lime method with obtaining gypsum as a commercial product, which consists in cooling gases, previously purified from dust, absorption of SOj lime suspension, oxidation of sulphite formed by water Calcium to Kg sulfate (gypsum) and separation of gypsum by filtration ClJ
    The disadvantage of this method
    It is impossible to use a contaminated filtrate after the separation of gypsum, i.e., to organize a closed process, and a large resistivity during filtration.
    The aim of the invention is to perform a closed process without discharging wastewater.
    The goal is achieved by the fact that the waste gases containing; So,., Without pretreatment, is cooled by washing with water, then SOj is absorbed by lime suspension, the resulting calcium sulfite is oxidized to calcium sulfate (gypsum), the gypsum is separated by filtration, and the filtrate is mixed with washing cooling water, containing coal dust, and with a suspension of lime, followed by the separation of precipitated metal hydroxides and recycled purified: filtrate into the process, for example, at the stage of washing the gases for the absorption of the scavenger.
    The drawing shows a process flow diagram, the scheme of purification of waste gases OTlSO-j and Well. method with obtaining commodity gypsum. It consists of a column 1 of water washing to cool the gases, moisten them and remove dust, an absorber 2 to absorb the Soda lime slurry.
    oxidizing column 3 for oxidizing calcium sulfite to sulfate, settling tank 4, neutralizing agent 5 for neutrifying the clarified liquid from the settling tank, filter 6, and absorber tank 7.
    Waste gases from a low power boiler plant operating on fuel oil were used. The waste gas flow rate was about 2000. Sampling for analysis was carried out after the unit was set to steady state.
    After mixing the wash water from the water wash column (liquid c) with the clarified liquid (liquid e) and fresh lime slurry (liquid c) in a volume ratio of 10: 7, 9: 1, the deposited precipitate is filtered off. The pH of the liquids is accordingly:
    C 1.85 D 2.2 V 12.6
    The resistivity during filtering out is:
    С + Д + В 7,010 m / kg. Content of impurities in liquids, mg / l:
    Mg At S (0,
    Ni
    V
    Fe
    2
    C + D 125 7.04 4.59 17.5 5.55 18.0
    C + blend filtrate
    D + B 4.60 L, 6 0.58 0, 0 12.0 Degree of impurity removal,
    % 96.0 77 87 97 45 33
    For comparison, the filtered wash liquid with soluble impurities coming out of the water wash column and the filtrate is mixed with the clarified liquid from the sump. In a volume ratio of the filtrate, the clarified liquid is 1: 6.5. To this mixture (liquid A) a fresh lime slurry (liquid B) is added in bulk. The mixture of A and B is filtered. With
    This pH of fluids is accordingly:
    A 2.1
    12.6
    A + B 12.6
    "The resistivity in filtering the A + B mixture is 7.26 10 m / kg.
    Content of impurities in liquids, mg / l:
    Fe V Ni Mg At S i Oj, Liquid
    A 49.4 49.4 3.65 22.5 75.8 5.00 Filtrate S of mixture A + B 4.0341.6 0/83 5.00 3.07 35
    Analysis of the above results shows that the proposed method 0 removes more than 95% of iron and magnesium with a specific resistance during filtration, which is only 10% of the specific resistance in a known method.
    权利要求:
    Claims (1)
    [1]
    1. Vilesov N. G. and Kostyukovska A.A. cleaning of exhaust gases, Kiev, Technique, 02D1.71, - p. 64-66 (prototype).
    Purified gas
     t ..,.
    shh-igpsh-shi
    g
    Pr9mm / nvm. / 9dv with p / ineslmi
    Otzhvzlchy vaz
    Essential fifu3ifocfn
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    同族专利:
    公开号 | 公开日
    FR2159528B1|1975-03-28|
    DE2256109C2|1982-03-04|
    JPS5210838B2|1977-03-26|
    FR2159528A1|1973-06-22|
    US3888968A|1975-06-10|
    DE2256109A1|1973-05-17|
    IT983209B|1974-10-31|
    GB1413684A|1975-11-19|
    JPS4853994A|1973-07-28|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EA010270B1|2006-12-26|2008-08-29|Юрий Петрович Шаповалов|Method of waste gas purification of organic compounds and device therefor|
    RU2458014C2|2006-09-20|2012-08-10|Юнайтед Стэйтс Джипсам Компани|Method of producing mixture of very low consistency alpha and beta gypsum plaster|
    RU2459655C2|2007-10-23|2012-08-27|Бабкок Ноэлль Гмбх|Device and method of smoke fumes|
    RU2559493C2|2010-11-10|2015-08-10|Сименс Акциенгезелльшафт|Conditioning amine solvent contaminated with introduced sulphur oxides|US2080779A|1937-05-18|Purification of combustion gases |
    US2090142A|1933-12-28|1937-08-17|Ici Ltd|Wet purification of gases|
    US2021672A|1934-02-02|1935-11-19|Charles H Spaulding|Method and apparatus for conditioning precipitates and separating same from liquids|
    US2155853A|1937-03-29|1939-04-25|Pease Anthony Equipment Compan|Method of purifying flue gases|
    US2301429A|1940-04-22|1942-11-10|Coal Proc Corp|Method of and composition for treating water|JPS5072870A|1973-10-31|1975-06-16|
    JPS5217824B2|1974-04-19|1977-05-18|
    JPS5140379A|1974-10-04|1976-04-05|Babcock Hitachi Kk|HAIGASUNOSHORIHOHO|
    JPS5252871A|1975-10-28|1977-04-28|Mitsubishi Heavy Ind Ltd|Method of treating exhaust gas|
    JPS5293672A|1976-02-03|1977-08-06|Sumitomo Metal Ind Ltd|Desulfurization process of exhaust gas|
    JPS55124530A|1979-03-19|1980-09-25|Babcock Hitachi Kk|Method for desulfurization of combustion exhaust gas|
    US5266287A|1991-11-12|1993-11-30|The Babcock & Wilcox Company|Regenerable flue gas desulfurization system|
    US5384111A|1994-02-03|1995-01-24|Dravo Lime Company|Magnesium-enhanced lime scrubbing of sulfur dioxide with production of a high solids content sludge|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    JP46090115A|JPS5210838B2|1971-11-11|1971-11-11|
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