ガスタービン用セラミック燃焼器の開発 : 模擬石炭ガス燃料による実圧燃焼試験結果

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Tokyo Electric Power Company and Toshiba Corporation have been conducting a cooperative research program to develop a ceramic combustor for a power generating gas turbine. The objective of program is the development of a ceramic combustor for 20MW, 1300℃ class gas turbine in coal gasification combined cycle power generation. The combustor liner is composed of six stages of ceramic rings and three stages of ceramic tiles. Ceramic rings are supported by soft insulation materials which are filled into the space between ceramics and metal outer casing. Ceramic tiles are adopted to reduce the thermal stresses for the portion around the air intake holes where the temperature gradient is expected to be steep. As for the transition piece, ceramics are divided into four pieces to avoid the generation of excess thermal stresses. Pressureless sintered SiC is selected for both ceramic rings and ceramic tiles. The ceramic combustors were tested under the 1300℃ and 15ata conditions using pseudo coal gasified fuel having a calorific value of 93lkcal/Nm^3 to evaluate combustor performance and ceramic material reliability. A highly satisfactory combustion efficiency was obtained over a broad range of load condition with a pressure loss of about 3% and an outlet temperature nonuniformity (i.e., patern factor) of about 10% at the rated load condition. The obtained results of NO_x exhaust characteristics were highly satisfactory for not only thermal NO_x but fuel NO_x as well. In addition to the tests to evaluate combustion characteris-tics, the load-rejection test and trip test were also carried out, in which the fuel was shut off instantaneously and severe thermal stresses were generated due to the thermal shock. It was confirmed that the ceramics parts were healthy and sound after the trip tests.
社団法人日本ガスタービン学会の論文
1991-03-10

ガスタービン用セラミック燃焼器の開発 : 模擬石炭ガス燃料による実圧燃焼試験結果

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