How much does the calorific value of coal relate to the choice of gasification process?

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This post was last edited by lflsedin on 2012-5-19 08:50. Today, I came across a presentation PPT on the Datang Keqi coal-to-gas project in the database; it states that for the Datang project, the designed lower heating value of the fuel coal used in the power generation area is 2850 KCal/kg, while the designed lower heating value of the raw coal used in the gasification furnace is 3200 KCal/kg. Recently, I’ve noticed that many posts discuss the selection and matching of coal types and gasification methods, which leads me to wonder: is there really a relationship between the calorific value of coal and the choice of gasification process? If it is related, what would the extent of the impact be? For example, the low-calorific value of coal in the Zhundong region of Xinjiang is 5000 KCal per unit mass or more. Compared to the coal crushing and pressurization technology used at Datang Keqi, the difference in calorific value of the coal used in design is quite significant. If gasification units of the same scale are used with coal from the Zhundong region, wouldn’t the amount of heat generated by such systems be much higher? In that case, what are the advantages and disadvantages of choosing pulverized coal pressurized gasification for coal-to-natural gas projects in East China or other regions of Xinjiang? I just had this idea out of the blue, as I’ve only recently started dealing with these things and don’t have any theoretical data to back it up. If there’s anything wrong in what I say, I hope everyone will feel free to point it out.