What are the coal-to-gas concept stocks?

According to the industrial chain, listed companies related to coal chemical industry in China currently include Datang Power Generation (60 199 1), a coal chemical investor. China Chemical (60 1 17), Donghua Science and Technology (002 140) and 3D Engineering 002469 engaged in EPC project and engineering consultation of coal chemical industry; Hangyang (002430), zhanghua Machinery (002564) and Hailu Heavy Industry (002255) which provide coal chemical equipment; Wanbangda (300055) engaged in sewage treatment of coal chemical industry, etc. From a fundamental point of view, analysts believe that at present, we can pay due attention to equipment manufacturing companies, such as Hailu Heavy Industry and zhanghua Machinery.