Current Status of the CGT301, Ceramic Gas Turbine

Abstract

CGT301 ceramic gas turbine is being developed under a contract from NEDO as a part of the New Sunshine Program of MITI to improve the performance of gas turbine for co-generation through the replacement of the hot section components with ceramic parts. CGT301 is a recuperated, single-shaft ceramic gas turbine. We have been developing some unique technologies, such as the “hybrid” rotor, composed of a metal disk and inserted ceramic blades, considering the future applicability to larger gas turbines. We could attain the good engine performance with the primary type CGT at a TIT of 1,200°C. The reliability of the hybrid rotor was confirmed at a TIT of 1,350°C on the test rig. We conducted preliminary tests using the primary type CGT to extract the possible problems derived from the higher TIT. Some modifications were made and the engine operation at a TIT of 1,280°C was conducted successfully. On the basis of those experiences we finished the design and fabrication of the pilot CGT. This paper presents the progress in the development of CGT301.

Development of the Ceramic Gas Turbine Engine System (CGT301)

“…The test result by the turbine performance test rig in Primary type COT is shown in Fig.3 The seal damper made of ceramic fiber was developed to prevent gas leakage between the blade platform and the disk spot.[Ref. 5,6] Further the turbine disk was modified for decreasing gas leakage. [Ref.6] The rim of the disk was shaped -> to minimize the clearance with the blade platform.…”

“…In hot spin testing the hybrid rotor was successfully tested at TIT of 1,200*C. Then the engine equipped with the hybrid rotor was operated successfully in Phase2. [Ref.2,3,5,6) By these technology development of the hybrid rotor, the development of the turbine has been conducted to increase TIT and to improve the performance and the reliability in The blade height is 10% higher than that of the Primary type CGT(Type-A) to decrease the clearance loss.…”

“…It has been developed by Ishikawajima-Harima Heavy Industries Co., Ltd in collaboration with NGK Insulators, Ltd., and NGK Spark Plug Co., Ltd. [Ref. [1][2][3][4][5][6] The schedule of the project is shown in Table 1. The project was conducted in three phases.…”