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不同的沼气类型都是如何进行脱硫的?

时间:2021-08-20
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沼气中含有硫化氢,分子式为H2S,硫化氢为易燃危化品,与空气混合能形成爆炸性混合物,遇明火、高热能引起燃烧爆炸,加上硫化氢遇水后会对钢材产生较强的腐蚀特性,因此沼气提纯精制生物天然气的预处理工序的核心即是脱除硫化氢。
Biogas contains hydrogen sulfide with the molecular formula of H2S. Hydrogen sulfide is a flammable hazardous chemical. It can form an explosive mixture when mixed with air. It can cause combustion and explosion in case of open fire and high heat. In addition, hydrogen sulfide will have strong corrosion characteristics on steel when it meets water. Therefore, the core of the pretreatment process of biogas purification and refining biogas natural gas is to remove hydrogen sulfide.
不同的有机废弃物在厌氧状态下产生的沼气中的硫化氢浓度有高有低,差异比较大。造纸工业、发酵工业等由于在生产过程中有含硫的介质加入,生产废水产生的沼气含硫化氢的浓度便比较高。
The concentration of hydrogen sulfide in biogas produced by different organic wastes in anaerobic state varies greatly. Due to the addition of sulfur-containing medium in the production process of papermaking industry and fermentation industry, the concentration of hydrogen sulfide in biogas produced by production wastewater is relatively high.
沼气脱硫
如造纸行业的沼气可高达10000-35000ppm,淀粉工业沼气一般在10000ppm左右,生活垃圾填埋沼气则由于产生过程中相对较少有硫介质参与,因此硫化氢含量较低,一般在1000ppm以内。
For example, the biogas in the paper industry can be as high as 10000-35000ppm, the biogas in the starch industry is generally about 10000ppm, and the biogas in the domestic waste landfill is relatively less involved in the production process, so the content of hydrogen sulfide is low, generally within 1000ppm.
在我国,沼气的生产加工技术和商业化运行系统也已经逐渐成熟,通过自主创新、引进并消化吸取了国外成熟先进的高含固量的有机废弃物厌氧消化技术,其中以谷物秸秆、畜禽粪便、城市有机垃圾为处理对象的大型沼气工程也取得了突破性进展,因此,相应的沼气净化工艺技术也得到发展,形成了一系列相对比较成熟的技术。
In China, the production and processing technology and commercial operation system of biogas have gradually matured. Through independent innovation, the introduction and digestion of foreign mature and advanced anaerobic digestion technology of organic waste with high solid content have been absorbed. Among them, the large biogas project with grain straw, livestock manure and urban organic waste as the treatment object has also made breakthrough progress. Therefore, The corresponding biogas purification technology has also been developed, forming a series of relatively mature technologies.
行业内常用的沼气脱硫方法有:干法脱硫、湿法脱硫、络合铁脱硫、生物法脱硫等几种脱硫方法。
The commonly used biogas desulfurization methods in the industry include dry desulfurization, wet desulfurization, complex iron desulfurization, biological desulfurization and other desulfurization methods.

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