生物滴滤法去除焦炉煤气中的硫化物研究

发布时间：2018-10-30 15:30

【摘要】：近年来,随着我国大气环境污染的不断加剧,一些大气污染物的排放和化石能源的清洁利用变得越来越重要。煤炭是我国最主要的能源物质,其中硫元素在煤的燃烧利用时会在大气中形成硫酸盐,并引发酸雨、雾霾等环境问题。本文所研究的对象是在煤的炼焦过程中大量产生的副产品焦炉煤气,因其含有较多的硫化物杂质导致难以资源化利用,既浪费了能源利用价值,也形成了环境污染。焦炉煤气的脱硫难点在于其成分复杂,既有无机硫化物H2S,也有较多难以去除的硫醚、噻吩、羰基硫等有机硫化物,而生物脱硫是一种工艺简单、能耗小、安全环保的脱硫工艺,并且特定的微生物菌种能够去除不同的硫化物组分,经过长期的研究和发展,被认为是当前最具有应用潜力的脱硫工艺之一。本文使用一株最新分离纯化得到的鞘氨醇单胞菌Sphingomonas sp. PL1研究其用于焦炉气脱硫的可行性和发展前景。首先本文通过向液体培养基中添加Na2S作为模型化合物测试了微生物对无机硫的代谢去除能力,得出模拟实验得出不同S浓度负荷、pH下的去除效果,以及代谢过程中代谢产物的检测,推测出其代谢途径和主要中间产物。然后通过添加有机硫的模型化合物DBT测试其对有机硫化物的代谢能力,通过诱导驯化加强其代谢能力,并得出微生物在不同浓度、pH及含有有机碳和无机硫等复杂环境下的有机硫代谢效果。最后将该微生物接种到一个有机玻璃材料制成的小型生物滴滤塔中进行气体中硫化物的实验,对COS和甲硫醚三种硫化物进行单组分和多组分的去除实验,得出各组分的去除率,去除负荷等参数,并得出EBRT和pH等条件对微生物脱硫系统的影响,以及长时间运行时脱硫效率的稳定性等进行了研究。
[Abstract]:In recent years, the emission of some air pollutants and the clean utilization of fossil energy have become more and more important with the increasing pollution of air environment in China. Coal is the most important energy material in China. When sulfur is burned and used in coal, sulphate is formed in the atmosphere, which causes acid rain, haze and other environmental problems. The research object of this paper is coke-oven gas, which is produced in large quantities in coking process of coal. Because of its high sulfide impurity, it is difficult to make use of resources, which not only wastes the value of energy utilization, but also forms environmental pollution. The difficulty of desulphurization of coke oven gas lies in its complex composition, including inorganic sulfides H _ 2S and some organic sulfides such as sulfide, thiophene and carbonyl sulfur, which are difficult to remove. However, biological desulphurization is a simple process and low energy consumption. The desulfurization process of safety and environmental protection, and the specific microbial bacteria can remove different sulfide components, after a long period of research and development, is considered to be one of the most potential desulfurization processes. A newly isolated and purified sphingomonas Sphingomonas sp. was used in this paper. PL1 is used to study the feasibility and development prospect of coke oven gas desulfurization. Firstly, the removal ability of inorganic sulfur was tested by adding Na2S to the liquid medium as model compound, and the results of simulation experiment showed that the removal effect of pH under different S concentration load was obtained. The metabolic pathway and main intermediates were deduced from the detection of metabolites in the course of metabolism. Then the metabolic ability of organic sulfide was tested by DBT, and the metabolic ability of organic sulfide was enhanced by induction and acclimation, and the microbial concentration was obtained at different concentrations. Effects of pH and organic sulfur metabolism in complex environments such as organic carbon and inorganic sulfur. Finally, the microorganism was inoculated into a small bio-trickling tower made of plexiglass to carry out the experiment of sulfides in the gas. The removal rate of each component was obtained by the single-component and multi-component removal experiments of COS and methyl sulfide. The influence of EBRT and pH on microbial desulfurization system and the stability of desulfurization efficiency during long time operation were studied.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X784

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