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煤是我国的主要能源,每年用以燃烧的煤炭约占产量的70%。煤中的硫,随煤的燃烧形成SO_2进入大气,污染环境,影响生态平衡。随着采煤愈往深部进行,高硫煤的比例增大,因而对生态环境的污染也愈大。所以煤的脱硫是人类赖以生存的环境不遭污染的必要措施之一。脱硫有三种途径:烧前脱硫;燃烧过程中脱硫;烧后烟道气脱硫。
Coal is the main energy source in China, accounting for about 70% of the annual output of coal for combustion. Sulfur in coal, with the combustion of coal to form SO_2 into the atmosphere, pollute the environment, affecting the ecological balance. As coal mining goes deeper, the proportion of high-sulfur coal increases, resulting in more pollution to the environment. Therefore, the desulfurization of coal is one of the necessary measures to prevent pollution of the environment on which mankind lives. There are three ways to desulfurization: desulfurization before burning; desulfurization during combustion; desulfurization after burning flue gas.