Development of Gas Turbine for Air-Blown Gasification

The development progress and operation results with the gas turbine developed for the first coal gasification pilot plant (200T/D) in Japan are reported hereafter. The gas turbine based on the scale down of the commercial machine (H25), is called H14. To deal with coal gasification, the development of the combustor is main subject because of the low caloric value of fuel. We developed the combustor through many combustion tests with simulation gas, and the selected combustor was supplied to the actual gas test at the pilot plant. We could grasp the limit of stable combustion of the combustor because the fuel characteristics of actual fluctuated sharply. In addition, we could experience phenomena peculiar to the gasification such as the back fire problem and finally succeeded in air extraction linkage operation by no means inferior to the used coal fired thermal power generation. Thus we established the gas turbine technology for coal gasification and opened a way to future large gasification plants.