Desulfurization methods can be divided into wet method, semi dry method and dry method. Wet desulfurization accounts for 98% in Japan, 92% in the United States, 90% in Germany, 91% in China, and 85% in the world. Most large coal-fired units use wet desulfurization. At present, coal-fired power generation accounts for more than 70% of the whole power generation industry in China. The vast majority of coal-fired power plants adopt the "limestone gypsum wet desulfurization process".
Wet desulfurization is a very efficient, stable and low investment desulfurization process. However, affected by the dehumidification and whitening policies of some domestic central governments, semi dry and dry methods are currently favored in the steel and coking industries, and there is a trend to gradually replace wet desulfurization. With the further understanding of the formation mechanism of haze, the Ministry of ecological environment issued a document requesting that enterprises should not be forced to manage wet plumes ". Therefore, there is still room for wet desulfurization.
湿法脱硫和干法、半干法脱硫的副产物差别很大，不同的脱硫工艺，副产物也不尽相同。
The by-products of wet desulfurization, dry desulfurization and semi dry desulfurization are very different, and the by-products are also different in different desulfurization processes.
(1) At present, the commonly used desulfurization processes include calcium method, sodium method, ammonia method, magnesium method and activated carbon method. The varieties and states of by-products are different. Among them, calcium method has the largest output of desulfurization by-products (gypsum) and high application rate.
(2)在中小范围的烟气脱硫中，钠法、镁法、氨法运用较多，其脱硫副产物回收缺乏，致使传统多为丢弃法。
(2) In the small and medium-sized flue gas desulfurization, sodium method, magnesium method and ammonia method are used more, and the recovery of desulfurization by-products is lack, resulting in the traditional method of discarding.
(3)半干法和干法脱硫副产物由于反响不完好、成分复杂，处置明显比湿法工艺艰难，目前应用率很低。
(3) The semi dry and dry desulfurization by-products are obviously more difficult to dispose than the wet process due to incomplete response and complex composition, and the current application rate is very low.
(4) The selection of desulfurization process is largely affected by desulfurization by-products. At present, desulfurization has the trend of changing wet to dry, which will lead to the further increase of desulfurization by-products, and the disposal of desulfurization ash is difficult; Therefore, it is necessary to increase the discussion on the disposal of desulfurization ash.
The above is a detailed introduction about biogas desulfurization, which I hope will be helpful to you If you have any questions, please contact us We will provide you with professional service https://www.hneee.net
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