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沼气，化学分子式为颁贬4，是简单的有机化合物，甲烷是没有颜色、没有气味的气体，比空气轻，它是很难溶于水的气体，而且是可燃性的，甲烷和空气成适当比例的混合物，遇火会发生爆炸，所以使用沼气的时候要慎重，化学性质相当稳定，跟强酸、强碱或强氧化剂（如碍惭苍翱4）等一般不起反应。

Biogas, with the chemical formula CH4, is a simple organic compound. Methane is a colorless, odorless gas that is lighter than air. It is difficult to dissolve in water and is flammable. When methane is mixed with air in appropriate proportions, it can explode when exposed to fire. Therefore, caution should be exercised when using biogas. Its chemical properties are quite stable and it generally does not react with strong acids, bases, or oxidants (such as KMnO4).

沼气是一种新型的可再生能源， 沼气的燃烧产物中的污染物很少，而且沼气厌氧发酵技术对工厂废水、城市生活垃圾、农业废弃物等有非常好的处理效果， 有积极的环保意义。

Biogas is a new type of renewable energy, and the pollutants in the combustion products of biogas are minimal. Moreover, anaerobic fermentation technology of biogas has excellent treatment effects on factory wastewater, urban household waste, agricultural waste, etc., and has positive environmental significance.

沼气是一种混合气体，它的主要成分是甲烷，其次有二氧化碳、硫化氢（H2S）、氮 及其他 一些成分。沼气的组成中，可燃成分包括甲烷、硫化氢、一氧化碳和重烃等气体；不可燃成 分 包括二氧化碳、氮和氨等气体。在沼气成分中甲烷含量为55%～70%、二氧化碳含量为28%～44%、硫化氢平均含量为0.034%。

Biogas is a mixed gas, mainly composed of methane, followed by carbon dioxide, hydrogen sulfide (H2S), nitrogen, and other components. In the composition of biogas, combustible components include gases such as methane, hydrogen sulfide, carbon monoxide, and heavy hydrocarbons; Non combustible components include gases such as carbon dioxide, nitrogen, and ammonia. The methane content in biogas is 55% to 70%, the carbon dioxide content is 28% to 44%, and the average hydrogen sulfide content is 0.034%.

目前，国内很多废水厌氧处理的沼气，颁贬4含量在50-60%之间，如果选用合适的沼气发电机组，每立方沼气可发电2.2-2.6度，而现在很多公司为节省投资，上容量小的机组，每立方沼气只能发1.8度电。以17000惭3/天，热值为25惭闯/惭3沼气为例，每立方沼气发1.8度电的机组比每方沼气发2.6度电的机组每年少发400多万度电。

At present, many domestic anaerobic wastewater treatment biogas plants have CH4 content between 50-60%. If suitable biogas generators are selected, each cubic meter of biogas can generate 2.2-2.6 kWh of electricity. However, many enterprises now use smaller capacity units to save investment, and each cubic meter of biogas can only generate 1.8 kWh of electricity. Taking 17000M3/day and 25MJ/M3 biogas as an example, a unit that generates 1.8 kWh of electricity per cubic meter of biogas generates more than 4 million kWh of electricity per year less than a unit that generates 2.6 kWh of biogas per cubic meter.

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