... : Coal is converted to low BTU coal gas. Sulfur content, nitrogen oxides, dust are removed in the coal gas purification section ... in CGPS. 500rpm~600rpm gas engine and Siemens generator are chosen in our gas generator sets (400KW, 500KW, 800KW, 1000KW, 1200KW). Comparing ... . 6). Less contaminants. CGPS is more environmental friendly. Coal Gasification generator