# US 2014/0190173 A1 · Power generation system and method of stopping power generation system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0190173 A1 - Document ID: US20140190173A1 - Status: Published application - Kind: A1 - Application number: 14/140,385 - Filed: 2013-12-24 - Published: 2014-07-10 - Earliest claimed: 2012-12-25 - Assignees: Mitsubishi Heavy Industries, Ltd. - Applicants: Mitsubishi Heavy Industries, Ltd. - Inventors: Hiroyuki OZAWA - Web page: https://patentgrep.com/patent/US20140190173A1 ## CPC - F01D 21/00: Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for - F02C 3/14: characterised by the arrangement of the combustion chamber in the plant (combustion chambers per se F23R; F02C3/205 takes precedence) - F02C 9/00: Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants (controlling air intakes F02C7/057; controlling turbines F01D; controlling compressors F04D27/00; controlling in general G05) - H01M 2250/20: Fuel cells in motive systems, e.g. vehicle, ship, plane - H01M 2250/402: Combination of fuel cell with other electric generators - Y02B 90/10: Applications of fuel cells in buildings - Y02E 20/16: Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT] - Y02E 60/50: Fuel cells - Y02T 90/40: Application of hydrogen technology to transportation, e.g. using fuel cells - F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D) - F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00) - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A gas turbine including a compressor and a combustor, an SOFC including an air electrode (cathode) and a fuel electrode (anode), a first compressed air supply line adapted to supply a compressed air compressed by the compressor to the combustor, a second compressed air gas supply line adapted to supply a part of a compressed air compressed by the compressor to the air electrode (cathode), a first fuel gas supply line adapted to supply a fuel gas to the combustor, a second fuel gas supply line adapted to supply a fuel gas to the fuel electrode (anode), a fuel gas recirculation line adapted to return an exhausted fuel gas discharged from the fuel electrode (anode) to the fuel electrode (anode), a cooler provided in the fuel gas recirculation line are provided. ## Claims ### Claim 1 A power generation system comprising: a gas turbine including a compressor and a combustor; a fuel cell including an cathode and a anode; a first compressed oxidant supply line adapted to supply a compressed oxidant compressed by the compressor to the combustor; a second compressed oxidant supply line adapted to supply a part of the compressed oxidant compressed by the compressor to the cathode; a first fuel gas supply line adapted to supply a fuel gas to the combustor; a second fuel gas supply line adapted to supply a fuel gas to the anode; a fuel gas recirculation line adapted to return an exhausted fuel gas discharged from the anode to the anode; a cooler provided in the fuel gas recirculation line; and a control unit adapted to operate the cooler when the control unit has stopped the fuel cell and has cut the compressor and the second compressed oxidant supply line. ### Claim 2 (depends on 1) The power generation system according to claim 1, wherein a recirculation blower is provided in the fuel gas recirculation line, and the control unit operates the cooler at the same time as the control unit causes the fuel cell stop. ### Claim 3 (depends on 1) The power generation unit according to claim 1, wherein a reductant supply line adapted to supply a reductant to the anode, and a discharge line adapted to discharge an exhausted fuel gas discharged from the anode to an outside are provided, and the control unit supplies a predetermined amount of the reductant to the anode through the reductant supply line and discharges the exhausted fuel gas from the anode to an outside through the discharged line, at the same time as the control unit causes the fuel cell stop. ### Claim 4 (depends on 3) The power generation system according to claim 3, wherein a purge gas supply line adapted to supply a purge gas to the anode is provided, and when the temperature of the fuel cell is decreased to a predetermined temperature set in advance, the control unit stops suppling the reductant through the reductant supply line to the fuel cell, and supplies the purge gas through the purge gas supply line to the fuel cell. ### Claim 5 (depends on 1) The power generation system according to claim 1, wherein the cooler includes a heat exchanger. ### Claim 6 (depends on 1) The power generation system according to claim 1, wherein the cooler includes a spray nozzle or an ejector adapted to supply water to the fuel gas recirculation line. ### Claim 7 (depends on 1) The power generation system according to claim 1, wherein a third compressed oxidant supply line adapted to supply compressed oxidant to the second compressed oxidant supply line, and a discharge line adapted to discharge an exhausted oxidant discharged from the cathode to outside are provided, and the control unit requests to supply the compressed oxidant through the third compressed oxidant supply line and discharges the exhausted oxidant to outside through the discharge line at the same time as the control unit causes the fuel cell stop. ### Claim 8 (depends on 1) The power generation system according to claim 1, wherein the cooler includes a nozzle adapted to supply a mixed liquid of hydrophilic hydrocarbon and water to the fuel gas recirculation line. ### Claim 9 (depends on 8) The power generation system according to claim 8, wherein the cooler supplies the mixed liquid to the fuel gas recirculation line by its own weight. ### Claim 10 A method of stopping a power generation system, the method comprising the steps of: stopping supply of a compressed oxidant from a compressor of a gas turbine to a fuel cell; stopping supply of a fuel gas to an anode of the fuel cell; recirculating an exhausted fuel gas discharged from the anode to the anode; and cooling the exhausted fuel gas discharged from the anode.