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生物脱硫法进行脱硫的具体方法是什么?

首页- 新闻资讯 > 行业资讯 > 2022-06-20

生物脱硫法

Biological desulfurization
生物脱硫法主要是通过培育出针对含硫化合物的菌类,与煤中含硫化合物发生生物化学反应使其氧化,再通过酸洗、过滤等方法实现煤中硫的脱除。目前煤的生物法脱硫主要有生物浸出法和表面处理法。生物浸出法装置简单,针对性强及对煤中有机质破坏小,但处理时间较长,废液处理不及时容易造成二次污染。微生物表面处理法是把煤粉碎成微粒与水进行混合,在其下面吹进微细泡,煤和黄铁矿表面都附着气泡。将微生物加入到水溶液中,由于微生物附着与黄铁矿表面使其由疏水性变为亲水性,而煤粒表面仍保持其疏水性的特点。从而利用浮选柱使其分离,显着缩短脱硫时间。针对煤中不同形态硫的脱除,需要不同种类的微生物菌种,而且生物法仅能脱除一定的有机硫。另外,考虑到微生物菌种的选择性及有效性,反应器类型,脱硫工艺稳定性,脱硫周期等因素,目前还无法在工业实际生产过程中应用微生物技术对煤中硫进行脱除。
The biological desulfurization method is mainly to cultivate bacteria for sulfur-containing compounds, make them oxidized by biochemical reaction with sulfur-containing compounds in coal, and then remove sulfur from coal by acid washing, filtration and other methods. At present, biological desulfurization of coal mainly includes bioleaching and surface treatment. The bioleaching method has the advantages of simple device, strong pertinence and little damage to the organic matter in the coal, but the treatment time is long, and the waste liquid treatment is not timely, which is easy to cause secondary pollution. Microbial surface treatment method is to crush coal into particles and mix them with water, and blow micro bubbles under them. Bubbles are attached to the surface of coal and pyrite. When microorganisms are added to the aqueous solution, the hydrophobicity of pyrite changes to hydrophilicity due to the attachment of microorganisms to the surface of pyrite, while the surface of coal particles still maintains its hydrophobicity. Thus, the flotation column is used to separate them, and the desulfurization time is significantly shortened. For the removal of different forms of sulfur in coal, different kinds of microbial strains are required, and the biological method can only remove a certain amount of organic sulfur. In addition, considering the selectivity and effectiveness of microbial strains, reactor type, desulfurization process stability, desulfurization cycle and other factors, it is not possible to apply microbial technology to remove sulfur from coal in the actual industrial production process.
对于高硫炼焦煤,物理脱硫方法仅能脱除煤中无机硫,化学、生物等方法虽能脱除煤中部分有机硫,但有机硫伴生于煤的整个有机体中,这类方法在对煤中有机硫进行脱除的过程中不可避免地改变煤的有机化学结构,从而破坏炼焦煤的黏结性和结焦性,对炼焦得到的焦炭质量和强度造成不利影响。在热转化过程中调控硫的变迁行为,使硫更多的随挥发分释放,减少硫在焦中的滞留,降低焦中硫含量,成为合理利用高硫炼焦煤,增加炼焦配煤中高硫煤配比,降低配煤成本一行之有效的方法。
For high sulfur coking coal, physical desulfurization method can only remove inorganic sulfur from coal. Although chemical and biological methods can remove some organic sulfur from coal, organic sulfur is associated with the whole organism of coal. Such methods inevitably change the organic chemical structure of coal in the process of removing organic sulfur from coal, thus destroying the adhesion and coking of coking coal, and adversely affecting the quality and strength of coking coke. In the process of thermal conversion, the changing behavior of sulfur is regulated to make more sulfur release with volatile matter, reduce the retention of sulfur in coke, and reduce the sulfur content in coke. It has become an effective method to make rational use of high sulfur coking coal, increase the proportion of high sulfur coal in coking coal blending, and reduce the cost of coal blending.
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