Technological process suitable for coal based city gas should be chosen accord ing to the quality of coal and the scale of the factory and the coproduction of chemical products.

• 以煤为原料制取城市煤气，要根据煤质、工厂规模、联产化工产品等不同特点，来选择适宜的工艺路线，可以是煤的完全气化，也可以是煤的焦化。