Method for generating power through low heating value coal gas

The invention relates to a method for generating power through low heating value coal gas. The method includes the following steps that (1) the low heating value coal gas is fed into a boiler for burning, smoke generated by burning exchanges heat with a heat exchange face in the boiler, and high-temperature ultrahigh-pressure superheated steam is generated in a superheater and is fed into a high pressure cylinder of a turbine for generating power; (2) steam discharged from the high pressure cylinder enters a reheater, and reheated steam enters a low pressure cylinder for generating power; (3) steam discharged from the low pressure cylinder condensates to enter an, and water discharged from the economizer enters a steam pocket; and (4) in the steam pocket, the water enters a water cooling wall of the boiler and is heated into steam or a steam-water mixture which then returns to the steam pocket, and saturated steam enters the superheater. The low heating value coal gas is fed into boiler for burning, high-temp