Coal hydrogen production uses coal as the reducing agent and steam as the oxidant. At high temperature, carbon is converted into CO and H2-based synthesis gas, and then hydrogen is produced through the main production links such as gas purification, CO conversion and H2 purification. Coal can undergo various vaporization treatments, such as fluidized bed, spouted bed, fixed bed, etc. to realize coal hydrogen production. The basic principle of hydrogen production from coal can be expressed by chemical reaction equations. The chemical reaction process is: C(s)+H2O+heat→CO+H2
This reaction process is an endothermic process, the reforming process requires additional heat, and the heat released by the combustion of coal and air provides the heat required for the reaction. The CO in the product is further converted into CO2 and H2 through the water-gas transfer reaction. The chemical reaction process is: CO+H2O→CO2+H2+ thermal coal hydrogen production technology is quite mature and has been commercialized, but this hydrogen production process is more complicated. , the cost of hydrogen production is high, and the CO2 produced during the preparation process can cause the earth's greenhouse effect. However, due to the abundance of coal reserves in the world, this method is still the main method for producing hydrogen.