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Thermoelectric decoupling system and method for gas turbine cogeneration unit

A technology for cogeneration units and gas turbines, which is applied in the field of thermo-decoupling systems, can solve problems such as failure to utilize natural gas in cascade, and achieve the effects of reducing natural gas consumption, avoiding high energy consumption, and reducing steam costs.

Pending Publication Date: 2020-06-05
ZHEJIANG ZHENENG TECHN RES INST +1
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Problems solved by technology

According to statistics, gas-fired steam boilers need to burn 85Nm3 natural gas per ton of steam, and the fuel cost alone exceeds 250 yuan per ton of steam. Natural gas boilers directly burn natural gas to generate steam, and fail to utilize natural gas cascades

Method used

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  • Thermoelectric decoupling system and method for gas turbine cogeneration unit

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Embodiment

[0039] Taking a 9F gas turbine unit as an example, under rated working conditions, the generating power is 340MW, the temperature of the flue gas discharged from the gas turbine is 604°C, the flow rate of flue gas is 2355t / h, the enthalpy of high-temperature flue gas is 653kJ / kg, and the rated heating flow 100t / h, heating parameters of 1.7MPa, 260°C, steam enthalpy of 3010kJ / kg, design a set of capacity of 950MWh gas turbine flue gas heating molten salt heat storage peak-shaving system, the single-time steam production of this system is 1200t, The produced steam is merged into the industrial steam supply pipeline.

[0040] Among them, the heat exchange area of ​​the flue gas molten salt heat exchanger is 1800㎡, the molten salt steam generator is 1200㎡, the molten salt steam superheater is 60㎡, the design flow rate of the low-temperature and high-temperature molten salt pump is 650t / h, and the design flow rate of the water pump is 100t / h. The head is 80m, the radius of the low-...

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Abstract

The invention relates to a thermoelectric decoupling system for a gas turbine cogeneration unit. The thermoelectric decoupling system comprises a molten salt storage and heat release system, a waste heat boiler, a chimney, a gas turbine, a steam turbine medium-pressure cylinder, a steam turbine low-pressure cylinder, a generator and a hot user. The thermoelectric decoupling system has the beneficial effects that molten salt is heated by using high-temperature flue gas after the gas turbine generates power so as to store heat, so that high energy consumption caused by a direct combustion boileris avoided, the consumption of natural gas is reduced, and the steam cost is reduced; compared with an existing peak regulation technique of a heat accumulating type electric boiler, the problem of high energy consumption caused by the change of high-quality power into steam is solved; and according to the thermoelectric decoupling system, the gas turbine and the waste heat boiler are not rebuilt, only one molten salt storage and heat release system is additionally arranged, so that the thermoelectric decoupling of the gas turbine cogeneration unit is realized, and the problem that the directcombustion steam boiler with high energy consumption is forced to adopt due to shutdown of the gas turbine is solved.

Description

technical field [0001] The patent of the present invention relates to a thermoelectric decoupling system and method for gas turbine cogeneration units, which are mainly applicable to gas turbine cogeneration units with different capacities. Background technique [0002] The installed capacity of cogeneration in my country has reached 166.55 million kW, accounting for 24.02% of thermal power units with the same capacity and 17.23% of the total capacity of generating units in the country, most of which are coal-fired heating units. The heat load center gradually adopts gas turbine combined heat and power units, with an installed capacity of more than 12 million kW and a heat supply flow of more than 1900t / h. After the natural gas enters the gas turbine for power generation, the flue gas at 450°C to 620°C is introduced into the waste heat boiler for recovery, and steam is generated for external heating or driving a turbogenerator unit for power generation. , flexible start and ...

Claims

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Application Information

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IPC IPC(8): F22B1/06F22B1/18F22D1/50F22G1/00F02C6/18F01K17/02F01K23/10
CPCF01K17/025F02C6/18F22B1/06F22B1/1892F22D1/50F22G1/00Y02E20/14
Inventor 罗海华翁建明童红政刘文涛沙万里沈强徐云柯董益华孙士恩林俊光张曦赵申轶
Owner ZHEJIANG ZHENENG TECHN RES INST
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