Developing integrated coal gasification combined-cycle systems ensures cost-effective and environmentally sound options for supplying future power generation needs. The reduction of NOx emissions and increasing the inlet temperature of gas turbines are the most significant issues in gas turbine development in Integrated Coal Gasification Combined Cycle (IGCC) power generation systems. The coal gasified fuel, which is produced in a coal gasifier of an air-blown entrained-flow type has a calorific value as low as 1/10 of natural gas. Furthermore, the fuel gas contains ammonia when a gas cleaning system is a hot type, and ammonia will be converted to nitrogen oxides in the combustion process of a gas turbine. This study is performed in a 1500°C-class gas turbine combustor firing low-Btu coal-gasified fuel in IGCC systems. An advanced rich-lean combustor of 150-MW class gas turbine was designed to hold stable combustion burning low-Btu gas and to reduce fuel NOx emissions from the ammonia in the fuel. The main fuel and the combustion air are supplied into a fuel-rich combustion chamber with strong swirl flow and make fuel-rich flame to decompose ammonia into intermediate reactants such as NHi and HCN. The secondary air is mixed with primary combustion gas dilatorily to suppress the oxidization of ammonia reactants in fuel-lean combustion chamber and to promote a reducing process to nitrogen. By testing under atmospheric pressure conditions, the authors have obtained a very significant result through investigating the effect of combustor exit gas temperature on combustion characteristics. Since we have ascertained the excellent performance of the tested combustor through our extensive investigation, we wish to report on the results.

1.
Sato
M.
,
Ninomiya
T.
,
Nakata
T.
,
Ishikawa
H.
,
Yoshine
T.
, and
Yamada
M.
, “
Development of a 1300°C-Class Gas Turbine Combustor Burning Coal Derived Low BTU Gaseous Fuels, Third Report
,”
Transactions of the Japan Society of Mechanical Engineers
, Vol.
57
, No.
535
,
1991
, pp.
803
810
.
2.
Sato
M.
,
Nakata
T.
, and
Yamauchi
K.
, “
NOx Emission Characteristics of Coal-Derived Low BTU Gas Fuel
,”
Journal of the Fuel Society of Japan
, Vol.
69
, No.
10
,
1990
, pp.
952
959
.
3.
Ninomiya, T., Sato, M., Nakata, T., Yamauchi, K., Fukazawa, M., Abe, T., Ishikawa, H., Yoshine, T., Yamada, M., Hisa, S., and Hasegawa, H., “Development of a Gas Turbine Combustor for Coal Gasification, Fifth Report,” CRIEPI REPORT, EW89010, Central Research Institute of Electric Power Industry, Yokosuka, Japan, 1990.
4.
Nakata
T.
,
Sato
M.
, and
Hasegawa
T.
, “
Formation Characteristics of Fuel NOx in the Combustion of Coal Gaseous-Fueled Gas Turbine
,”
Transactions of the Japan Society of Mechanical Engineers
, Vol.
59
, No.
564
,
1993
, pp.
2568
2575
.
5.
Nakata, T., Hasegawa, T., Ninomiya, T., and Sato, M., “Development of a 1500°C-Class Gas Turbine Combustor for IGCC, First Report,” CRIEPI REPORT, EW92001, Central Research Institute of Electric Power Industry, Yokosuka, Japan, 1992.
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