Combined cycle device for steam extraction integration and heat storage peak-load shaving coupling and operation method of combined cycle device

Abstract

The invention relates to a combined cycle device for steam extraction integration and heat storage peak-load shaving coupling and an operation method of the combined cycle device. The combined cycle device comprises a gas turbine unit and a steam turbine unit; the gas turbine unit comprises a gas turbine air compressor, a gas turbine combustion chamber, a gas turbine body and a first generator, and the steam turbine unit comprises a waste heat boiler, a steam turbine high-pressure cylinder, a steam turbine low-pressure cylinder, a second generator, a steam condenser, a condensate water pump, agland heater, a deaerator, a first temperature and pressure reducing device, a second temperature and pressure reducing device, a steam heat accumulator, working equipment, power equipment, a heaterfor heating a network, a dewatering heat exchanger and a circular pump of a heat supply network. Based on the principle of gradient energy utilization and combined with a steam surplus energy utilization mode, integrated design of different steam extraction modes is carried out, and the thermoelectric decoupling operation capacity of a 6FA type combined cycle unit is effectively improved; the steam heat accumulator is utilized to improve the peak-load shaving and frequency modulation capacity of the combined cycle unit, and meanwhile, the outward heating capacity of the combined cycle unit under all conditions is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of improving the flexibility of thermal power units, and in particular relates to a combined cycle device for coupling steam extraction integration and heat storage peak regulation and an operating method thereof. Background technique [0002] At present, my country's policies are gradually emphasizing the promotion of new energy sources and reducing the proportion of thermal power units, which makes the development of thermal power units face severe challenges. At present, in order to improve the comprehensive energy utilization efficiency of thermal power units and strive for more utilization hours of power generation, deeply excavating the heating capacity of thermal power units has attracted more and more attention from all walks of life. Gas-fired cogeneration is a form of energy utilization that produces heat and electricity at the same time. It uses high-grade heat for power generation and low-grade h...

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Problems solved by technology

[0003] At present, the main problem faced by the central heating system of gas-fired cogeneration is that the heat-to-power ratio is low. The heat-to-power ratio generated by conventional gas-fired cogeneration combinations has certain limitations. The smaller it is, taking a 100,000 kW unit as an example, its heat-to-electricity ratio is about 0.7

Especially in the face of the current severe situation of deep peak regulation of thermal power, the units often operate under low load conditions. At this time, the external heating capacity of the units is lower, which has a serious impact on the safety of heating supply.

However, the existing technology such as the patent "A Combined Cycle Heat and Power Cogeneration System (Patent No. 201310401252.0)" is to use high exhaust steam extraction to reduce temperature and reduce pressure to supply heat to the outside. The technical defects are: (1) No consideration of energy The cascade utilization of direct temperature reduction and pressure reduction has a large loss of working capacity; (2) The need for deep peak regulation of thermal power is not considered. In order to meet the external heat supply, the unit needs to operate at a high load, and the peak regulation capacity of the unit is poor

Existing technologies such as the patented "gas-steam combined cycle heating system (Patent No. 201710534092.5)" use mid-exhaust steam extraction or low-pressure supplementary steam from waste heat boilers to provide the outside world with the steam required for heating and cooling. The low-pressure supplementary steam can be transported to the steam pipe of the adjacent machine. The characteristic of this technology is that it only considers the external heating demand, but does not consider the power peak-shaving demand of the unit. The peak shaving capacity of the excavator

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