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Tham khảo sách 'advances in gas turbine technology_2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Part 4 Combustion 11 Developments of Gas Turbine Combustors for Air-Blown and Oxygen-Blown IGCC Takeharu Hasegawa Central Research Institute of Electric Power Industry Japan 1. Introduction From the viewpoints of securing a stable supply of energy and protecting our global environment in the future the integrated gasification combined cycle IGCC power generation of various gasifying methods has been introduced in the world. Gasified fuels are chiefly characterized by the gasifying agents and the synthetic gas cleanup methods and can be divided into four types. The calorific value of the gasified fuel varies according to the gasifying agents and feedstocks of various resources and ammonia originating from nitrogenous compounds in the feedstocks depends on the synthetic gas clean-up methods. In particular air-blown gasified fuels provide low calorific fuel of 4 MJ m3 and it is necessary to stabilize combustion. In contrast the flame temperature of oxygen-blown gasified fuel of medium calorie between approximately 9-13 MJ m3 is much higher so control of thermal-NOx emissions is necessary. Moreover to improve the thermal efficiency of IGCC hot dry type synthetic gas clean-up is needed. However ammonia in the fuel is not removed and is supplied into the gas turbine where fuel-NOx is formed in the combustor. For these reasons suitable combustion technology for each gasified fuel is important. In this paper I will review our developments of the gas turbine combustors for the three type gasified fuels produced from the following gasification methods through experiments using a small diffusion burner and the designed combustors tests of the simulated gasified fuels. Air-blown gasifier Hot Dry type synthetic gas clean-up method. Oxygen-blown gasifier Wet type synthetic gas clean-up method. Oxygen-blown gasifier Hot Dry type synthetic gas clean-up method. Figure 1 provides an outline of a typical oxygen-blown IGCC system. In this system raw materials such as coal and crude .
