US 11,913,341 B2
Clearance control system for gas turbine
Yuya Fukunaga, Kanagawa (JP); Susumu Wakazono, Kanagawa (JP); and Satoshi Hada, Kanagawa (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
Appl. No. 18/018,698
Filed by MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
PCT Filed Sep. 7, 2021, PCT No. PCT/JP2021/032762
§ 371(c)(1), (2) Date Jan. 30, 2023,
PCT Pub. No. WO2022/054777, PCT Pub. Date Mar. 17, 2022.
Claims priority of application No. 2020-150225 (JP), filed on Sep. 8, 2020.
Prior Publication US 2023/0296030 A1, Sep. 21, 2023
Int. Cl. F01D 11/24 (2006.01); F02C 7/18 (2006.01)
CPC F01D 11/24 (2013.01) [F02C 7/18 (2013.01); F05D 2220/32 (2013.01); F05D 2240/55 (2013.01); F05D 2260/232 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A clearance control system for a gas turbine for controlling, in the gas turbine that includes a compressor for producing compressed air, a combustor for burning fuel with the compressed air, and a turbine driven by a combustion gas generated by burning the fuel in the combustor, a clearance between a stationary part and a rotary part of the turbine, comprising:
a cooling passage which is formed in the stationary part and through which a cooling medium for cooling the stationary part flows;
a combustor internal flow passage which communicates with the cooling passage downstream of the cooling passage in a flow direction of the cooling medium and is formed in the combustor;
a supply device for supplying the cooling medium to at least either the cooling passage or the combustor internal flow passage;
an adjustment device for adjusting a first flow rate which is a flow rate of the cooling medium flowing through the cooling passage, and a second flow rate which is a flow rate of the cooling medium bypassing the cooling passage and flowing through the combustor internal flow passage; and
a control device for detecting a load of the gas turbine and operating the adjustment device on the basis of the load,
wherein the control device operates the adjustment device such that the first flow rate is greater than the second flow rate when a load stable state is entered in which a fluctuation range of the load shifts within a preset range, and operates the adjustment device such that the second flow rate is greater than the first flow rate when a load fluctuation state is entered in which the load falls outside the range.