HIGH-PRESSURE TEST-RESULTS OF A CATALYTIC COMBUSTOR FOR GAS-TURBINE

Recently, the use of gas turbine systems, such as combined cycle and c ogeneration systems, has gradually increased in the world. Bur even wh en a clean fuel such as LNG ( Iiquefied natural gas) is used, thermal NOx is generated in the high temperature gas turbine combustion proces s. The NOx emission from gas turbines is controlled through selective catalytic reduction processes (SCR) in the Japanese electric industry. If catalytic combustion could be applied to the combustor of the gas turbine, it is expected to lower NOx emission more economically. Under such high temperature and high pressure conditions, as in the gas tur bine, however, the durability of the catalyst is still insufficient. S o it prevents the realization of a high temperature catalytic combusto r. To overcome this difficulty, a catalytic combustor combined with pr emixed combustion for a 1300 degrees C class gas turbine was developed . In this method catalyst temperature is kept below 1000 degrees C, an d a lean premixed gas is injected into the catalytic combustion gas. A s a result, the load on the catalyst is reduced and it is possible to prevent the catalyst deactivation. After a preliminary atmospheric tes t, the design of the combustor was modified and a high pressure combus tion test was conducted. As a result, it was confirmed that NOx emissi on was below 10 ppm (at 16 percent O-2) at a combustor outlet gas temp erature of 1300 degrees C and that the combustion efficiency was almos t 100 percent. This paper presents the design features and test result s of the combustor.