US 12,258,902 B2
Gas turbine cogeneration system, method of operating gas turbine cogeneration system, and method of modifying gas turbine cogeneration system
Takashi Asao, Tokyo (JP); Kazuhiko Sato, Tokyo (JP); Shohei Yoshida, Tokyo (JP); and Ryo Akiyama, Tokyo (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
Filed by MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
Filed on Nov. 16, 2023, as Appl. No. 18/510,997.
Claims priority of application No. 2022-189714 (JP), filed on Nov. 29, 2022.
Prior Publication US 2024/0175395 A1, May 30, 2024
Int. Cl. F02C 6/18 (2006.01); F02C 3/22 (2006.01); F02C 3/30 (2006.01); F02C 9/28 (2006.01)
CPC F02C 6/18 (2013.01) [F02C 3/22 (2013.01); F02C 3/30 (2013.01); F02C 9/28 (2013.01); F05D 2240/35 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method of operating a gas turbine cogeneration system, the gas turbine cogeneration system comprising:
a gas turbine including a compressor, a combustor, and a turbine;
a first fuel supply facility for supplying a first fuel to the combustor;
a second fuel supply facility for supplying a second fuel to the combustor, the second fuel having a calorific value per mass that is lower than that of the first fuel;
a heat recovery steam generator for generating steam using exhaust gas discharged from the turbine;
a steam supply line for supplying the steam discharged from the heat recovery steam generator to a steam consumer; and
a steam extraction line for supplying steam extracted from the steam supply line to both a head end side of the combustor and a turbine side of the combustor, the turbine side of the combustor being closer to the turbine than the head end,
the method comprising;
acquiring a consumer steam increase command to increase a consumer steam supply amount, the consumer steam supply amount being a supply amount of the steam supplied to the steam consumer;
controlling the steam supply line to achieve the consumer steam supply amount indicated by the consumer steam increase command;
controlling the steam extraction line to reduce an extraction amount of the steam extracted by the steam extraction line in response to the increased consumer steam supply amount;
controlling the first fuel supply facility so that a supply amount of the first fuel decreases in response to the decrease in the extraction amount of the steam by the steam extraction line; and
controlling the second fuel supply facility so that a supply amount of the second fuel increases in response to the decrease in the extraction amount of the steam by the steam extraction line.
 
3. A gas turbine cogeneration system, comprising:
a gas turbine including a compressor, a combustor, and a turbine;
a first fuel supply facility for supplying a first fuel to the combustor;
a second fuel supply facility for supplying a second fuel to the combustor, the second fuel having a calorific value per mass that is lower than that of the first fuel;
a heat recovery steam generator for generating steam using exhaust gas discharged from the turbine;
a steam supply line for supplying the steam discharged from the heat recovery steam generator to a steam consumer;
a steam extraction line for supplying steam extracted from the steam supply line to both a head end side of the combustor and a turbine side of the combustor, the turbine side of the combustor being closer to the turbine than the head end; and
a controller comprising a processor communicatively coupled with a memory, the memory having instructions programmed therein which, when executed by the processor, cause the controller to:
acquire a consumer steam increase command to increase a consumer steam supply amount, the consumer steam supply amount being a supply amount of the steam supplied to the steam consumer;
control the steam supply line to achieve the consumer steam supply amount indicated by the consumer steam increase command;
control the steam extraction line to reduce an extraction amount of the steam extracted by the steam extraction line in response to the increased consumer steam supply amount;
control the first fuel supply facility so that a supply amount of the first fuel decreases in response to a decrease in the extraction amount of the steam by the steam extraction line; and
control the second fuel supply facility so that a supply amount of the second fuel increases in response to the decrease in the extraction amount of the steam by the steam extraction line.