Only for reference:
The coal gas added in GT++ can use 16 coal+1000L steam in the pyrolysis oven to produce 2880L coal gas and 10 coke in the programming circuit = 22. In addition, you can also use 20 logs + 1000L steam to produce 24 charcoal and 1440L coal gas under the selection circuit = 20.
In GT++, coal gas can only be used as fuel for gas turbine. In fact, it should be able to distill out carbon monoxide, carbon dioxide, hydrogen and less hydrocarbons (such as methane)