• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Sulphur dioxide is removed froma gas by (a) contacting the gas with a thin aqs. absorption soln. of sodium, lithium or beryllium sulphite in an absorption column so that sulphur dioxide is absorbed in the gas with conversion of sulphite into bisulphite and formation of used absorption soln. contg. the corresponding metal bisulphite, (b) exposing the used soln. in a desorption zone to temps. high enough to decompose the bisulphute into sulphite, sulphur dioxide and water, (c) removing sulphur dioxide and water from the desorption zone and precipitating the sulphite from the soln. until the formed slurry contains >=25% wt. undissolved solids, (d) passing the slurry from the desorption zone through the tubes of an indirect heat exchanger with supply of heat to the slurry, and (e) recycling the sulphite of the slurry to the absorption zone.
    公开号:SU860679A1
    申请号:SU721751949
    申请日:1972-02-21
    公开日:1981-08-30
    发明作者:Бриан Ирл Кристофер；Хьюз Фред
    申请人:Уэлман Паувэр Инкорпорейтед (Фирма)；
    IPC主号:
    专利说明:

    (54) METHOD OF EXTRACT. Sulfur anhydride
    FROM GASES
    one
    The invention relates to the purification of gases and can be used to extract sulfur dioxide from the waste gases of chemical plants and flue gases.
    A method is known for extracting sulfuric anhydride from gases, including contacting them with an aqueous solution of metal sulfite and subsequent regeneration of the spent absorber by thermal decomposition of the metal bisulfite anhydride formed by sulfite, sulfuric anhydride and water. During the thermal decomposition of bisulfite, metal sulfite precipitates from solution, forming a slurry. When concentrated; With no solid particles in the sludge, 10-15% of it is removed from the regeneration zone for filtration, after which the refined metal sulfite is diluted with water and sent to the absorption zone. Sodium, lithium and beryllium sulfites are used as metal sulfite 11.
    The disadvantages of this method are the deposition of solid particles on the surface of the equipment of the regeneration zone (including heat exchangers), which causes a decrease in the efficiency of the heat exchange and the need to periodically stop the process for cleaning the equipment, as well as the complexity and multi-stage cleaning process.
    The purpose of the invention is to simplify the process and prevent the formation of solid deposits on the surface of the apparatus.
    The goal is achieved by
    10 that the absorption solution is regenerated until the solids content in the sludge formed during regeneration is 25-60% by weight.
    Sludge removed from the regeneration zone
    15 with the indicated sulfite content is diluted with water and sent to the absorption zone.
    The drawing shows a device for implementing the method.
    20
    Example. The flue gas containing, mol%: sulfuric anhydride 0.25, sulfuric anhydride 0.005 and fly ash 0.003, at 170 ° C is directed to the lower part of the absorber 1. The gas is first sent to the pretreatment zone 2 where it is irrigated with water, entering through conduit 3, and passing through filter 4. In the pre-treatment zone, the gas is cleaned from flying ash and sulfuric anhydride.
    The pre-cleaned gas is directed through the plates 5 of the absorption column, where it is irrigated with a water solution coming through pipelines 6 and 7 at and containing, wt%: sodium sulfite 18.8, sodium bisulfite (in terms of pyrosulfite NanSr Oj) 4, 1, sodium sulfate 4.8. The solution flows into the collectors 8 and 9, from which it is discharged through pipelines 10 and 11. The purified gas containing 0.05 mol% sulfuric anhydride is passed through the washer 12 and removed from the column at 60 ° C. coming out of the column through the pipeline 10, is recycled to the column by pump 13. The spent solution containing, wt.%: sulfite 5.8, bisulfite 21.2 and sulfate 5 and leaving the column through pipeline 11, is pumped 14 into the column the pipeline 15 and serves on the regeneration. the pipeline 16. Directed to the regeneration of growth the thief is preheated (heater not shown) to 95 ° C and sent through pipelines 17 and 18 to the recirculation circuits of the regenerators 19 and 20 in equal quantities. In the regenerator 19, the temperature is maintained at 130 ° C and the pressure is 2.3 atm, and in the regenerator 20 - the temperature and pressure is 1.0 atm. In the recirculation circuits of the regenerators 19 and 20, the solution is fed by pumps 21 and 22; respectively, in boilers 23 and 24, in which they heat from 130 to 132 ° C and from 106 to 10 ° C, respectively. Then the solution is fed through pipelines 25 and 26 to regenerators and pipelines 27 and 28 to output slurry containing 40% by weight of solid particles . The volumetric ratio between the sludge discharged from the regenerator via lines 27 and 28 and the spent absorption solution fed through lines 17 and 18 is 320: 1. Sludge heating in boilers is carried out with steam supplied through conduit 29 at a pressure of 4.4 atm and with a stream of steam and sulfur dioxide fed through conduit 30 from a regenerator 19 at 13 ° C. Condensate from boiler 23 is withdrawn through conduit 31, and from boiler 24 at 113 ° C through conduit 32 to tank 33. Non-condensable components containing 60% by weight of sulfurous anhydride, from boiler 24 are withdrawn through conduit 34 into pipeline 35 at. A vapor-gas mixture containing 7.2% by weight of sulfurous anhydride is withdrawn from the regenerator 20 to the pipeline 35. The pipeline 35 it is served in a distillation system for the regeneration of sulfurous anhydride (not shown; -ja).
    From the regenerator 19, pipeline 130 at 130 ° C is fed to the regenerator 20 with sludge containing, in wt%: sulphite 23, sulphate 12 and bisulphate (in terms of pyrosulphite) 21. From the regenerator 20 through conduit 37 at - 107 ° tsamsam containing weight. % sulfite 34, bisulfite (in terms of pyrosulfite) 21 and sulfate 12 when the content of undissolved particles 40 wt.% and served in the tank 33, where
    0 also serves an additional amount of water through pipeline 38. Pipelines 39 and 40 from tank 33 remove a stream of liquid containing, in wt%: sulphite 14.1; bisulfite 8,6
    5 and sulfate 5.
    Sodium hydroxide solution is fed through line 42 to the feed tank. 41 and the same is passed through the pump. 43, an absorption solution containing, in wt%, sulphite 18.8; bisulfite (based on pyrosulfite) 4.1 and sulfate 4.8.
    Production in the regeneration zone of sludge with a high content of solids
    j particles reduces their deposition on the surface of the apparatus, which increases the duration of its continuous operation and reduces losses due to. account reduced the efficiency of heat transfer. In addition, the increased solids content in WJ1aME makes it possible to simplify the process by eliminating from it the stage of separating solid particles from the mother liquor by centrifuging.
    权利要求:
    Claims (2)
    [1]
    1. Method for the recovery of sulfur
    0 anhydride from gases, which includes contacting them with an aqueous solution of metal sulfite and the subsequent regeneration of the spent absorber by thermal decomposition of the metal bisulfite anhydride formed during the absorption of sulfite, sulfur dioxide and water, so as to simplify the process and prevent solid deposits
     on the surface of the apparatus, the absorption of the absorption solution is carried out until the solids content in the sludge formed during regeneration is 25-60% by weight.
    five
    [2]
    2. A method according to claim 1, characterized in that the sludge discharged from the regeneration zone is diluted with water and sent to the absorption zone.
    0 Sources of information
    taken into account in the examination
    1. US Patent No. 3653812, cl. 23-2, 07.07.69.
    类似技术:
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    同族专利:
    公开号 | 公开日
    SE382966B|1976-02-23|
    NO130978C|1975-03-19|
    ES400063A1|1974-12-16|
    JPS5137631B1|1976-10-16|
    NO130978B|1974-12-09|
    BR7200876D0|1973-05-24|
    BE779632A|1972-08-21|
    ZA7245B|1972-09-27|
    IT948632B|1973-06-11|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JPS51157922U|1975-06-10|1976-12-16|
    JPS5384718U|1976-12-15|1978-07-13|
    FI73603C|1985-06-17|1987-11-09|Catena Oy|Process for collecting and utilizing the sulfur dioxide in sulfur-containing gases such as flue gases.|
    WO1993001881A1|1991-07-23|1993-02-04|Rauma Wood International Ltd.|Method and apparatus for recovery of sulfur and/or nitrogen oxides from gases containing such oxides|
    CN105771532A|2016-04-26|2016-07-20|中冶南方工程技术有限公司|Flue gas desulfurizer through condensation|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US11738371A| true| 1971-02-22|1971-02-22|
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