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Focusing on coal industry transformation and upgrading, and social responsibility performance, Yankuang Group started the "Blue-Sky Project", initially forming a technology system of coal combustion controls, and consequently explored a new path of coal clean and efficient utilization. A clean coal production plant with an annual output of 1 million tons, a compound additives production plant with an annual output of 500 thousand tons, and a production line with an annual output of 100 thousand stoves have been constructed and put into operation.