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高硫煤产区,如印第安纳州、伊利诺斯州和俄亥俄州,正面临着1990年颁布的大气净化法修正案(CAAA)的挑战。这三个位于美国中西部的州,其煤炭消费量和现有储量都名列前10位。这些州开采的高硫煤即使经过常规选煤厂洗选,仍然达不到CAAA规定的2000年排放标准,即SO_2为o0.52kg/GJ或1.2磅/MMBtu。许多公用公司提出改用美国西部和阿帕拉契亚山脉中心地区的低硫煤或安装涤气装置的计划。因燃煤电厂占全国电力近60％,公用事业部门耗煤量占全国的80％,所以,
High-sulfur coal-producing regions, such as Indiana, Illinois and Ohio, are facing the challenge of the Atmospheric Purification Amendment (CAAA), enacted in 1990. The three states located in the Midwest of the United States rank the top 10 coal consumers and existing reserves. High-sulfur coal mined in these states can not meet the CAAA’s 2000 annual discharge standard of SOp2 at 0.52 kg / GJ or 1.2 lb / MMBtu, even after being washed at a conventional coal preparation plant. Many utility companies have proposed to switch to low-sulfur coal or to install scrubbers in the western United States and the heart of the Appalachian Mountains. Because coal-fired power plants account for nearly 60% of the national electricity and the coal consumption of public utilities accounts for 80% of the national total,