■ The boiler for the efficient and clean burning coal-fired boiler environment. ■ Horizontal Style body double drum natural circulation, heat set and air economizer, boiler thermal efficiency up to 80%     Above. ■ application of fuel: Ⅰ type bituminous coal, Ⅱ type low quality coal. ■ boiler capacity of 6-35T / H (4.2-29MW).