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干法、湿法与生物脱硫工艺比较你知道哪些?

时间:2019-06-20
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  随着节能减排政策不时不得人心,很多企业都打算应用污水站的沼气局部替代自然气,进入锅炉熄灭或发电。那么,沼气应用前的硫化氢脱除工艺(脱硫),就成为工厂和站长们的选择难点。当前,比拟常用的工艺有干法脱硫、湿法脱硫和生物脱硫,本文就将三种工艺为您做一个简单的阐明和比照。
  With the unpopular policy of energy saving and emission reduction from time to time, many enterprises intend to use biogas from sewage stations to replace natural gas partially and enter boilers to extinguish or generate electricity. So, the hydrogen sulfide removal process (desulfurization) before the application of biogas has become a difficult choice for factories and stationmasters. At present, compared with the commonly used processes are dry desulfurization, wet desulfurization and biological desulfurization, this paper will give you a simple explanation and comparison of the three processes.
  一、 常见的脱硫工艺
  I. Common desulfurization processes
  1. 干法脱硫
  1. Dry Desulfurization
  沼气从脱硫塔的一端,经过填料层(主要成分是活性炭和氧化铁)净化后,从另一端流出。硫化氢与填料层的氧化铁发作反响,生成硫化铁;待氧化铁反响完毕后,可停止再生。
  Biogas flows from one end of the desulfurization tower to the other end after being purified by a packed layer (mainly composed of activated carbon and iron oxide). Hydrogen sulfide reacts with iron oxide in the filler layer to form iron sulfide, and the regeneration can be stopped after the reaction of iron oxide is completed.
  脱硫原理:
  Desulfurization principle:
  Fe2O3 · H2O+ 3H2S = Fe2S3 + 4 H2O
  Fe2O3.H_2O+3H_2S = Fe2S_3+4H_2O
  再生原理:
  Regeneration principle:
  Fe2S3 + 3/2 O2+ 3 H2O = Fe2O3 ·H2O + 2 H2O+ 3 S
  Fe2S3+3/2 O 2+3 H 2 = Fe2O3.H 2+2 H 2+3 S
  2. 湿法脱硫
  2. Wet Desulfurization
  湿法脱硫是将沼气送入洗濯塔,经碱性溶液洗濯吸收后流出,洗濯液进入富液槽、再生槽,经过运用化学药剂办法催化、氧化,终将硫化物转化为单质硫(硫泡沫),吸收液能够再生循环运用。
生物脱硫
  Wet desulphurization is to send methane into the washing tower, wash it through alkaline solution, wash it out, wash the liquid into the rich liquid tank and regeneration tank, and then use the chemical method to catalyze and oxidize. Finally, the sulphide is converted into elemental sulfur (sulfur foam), and the absorption liquid can be recycled and recycled.
  工艺流程表示图如下:
  The process flow chart is as follows:
  3. 生物脱硫
  3. Biological Desulfurization
  生物脱硫也是湿法脱硫的一种,与上述湿法脱硫的催化氧化工艺相比,大区别是运用硫杆菌替代化学催化剂,将硫化物直接氧化成硫单质。
  Biological desulfurization is also a kind of wet desulfurization. Compared with the catalytic oxidation process of wet desulfurization mentioned above, the biggest difference is that Thiobacillus is used instead of chemical catalyst to oxidize sulfide directly to sulfur.
  反响原理:
  Reaction Principle:
  H2S + OH-= HS- + H2O
  H2S+OH-= HS-+H2O
  HS- + 1/2O2= So + OH-
  HS-+1/2O2= So+OH-
  1)干法脱硫多用于硫化氢处置负荷小,或者对脱硫效果请求很高的工况。这时,干法脱硫多用于湿法脱硫或者生物脱硫之后,进一步脱硫。
  1) Dry desulfurization is mostly used in the condition of low load of hydrogen sulfide disposal or high requirement for desulfurization effect. At this time, dry desulfurization is mostly used for further desulfurization after wet desulfurization or biological desulfurization.
  2)在制定脱硫效果时,倡议依据后续设备(锅炉或发电机)对硫化氢浓度的限制,以及沼气与自然气耗费量的比例,制定一个合理的脱除效果。我们通常倡议终的硫化氢含量控制在25~100ppm。
  2) In formulating desulfurization effect, it is advocated that a reasonable removal effect be formulated according to the limitation of hydrogen sulfide concentration by follow-up equipment (boiler or generator) and the ratio of biogas consumption to natural gas consumption. Usually we advocate that the final hydrogen sulfide content be controlled at 25-100 ppm.
  以上,我们引见了三种常用的脱硫工艺,这三种工艺各有优缺陷。在实践工作中,请大家依据实践状况,灵敏运用,选择适宜的工艺。若您有任何疑问,欢送和我们联络。我们的网址是http://www.dh-gwsg.com,点击了解更多详情。
  Above all, we have introduced three most commonly used desulfurization processes, each of which has its own advantages and disadvantages. In practical work, please select the appropriate technology according to the practical situation and use it sensitively. If you have any questions, welcome to contact us. Our website is http://www.dh-gwsg.com. Click for more details.
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