Heat storage coupling steam extraction integrated system used for combined cycle energy gradient utilization and operation method of heat storage coupling steam extraction integrated system

Abstract

The invention relates to a heat storage coupling steam extraction integrated system used for combined cycle energy gradient utilization and an operation method of the heat storage coupling steam extraction integrated system. The heat storage coupling steam extraction integrated system comprises a waste heat boiler, a steam turbine high pressure cylinder, a steam turbine low pressure cylinder, an electric generator, a condenser, a condensate pump, a hot water exchanger, a shaft sealing heater, a deaerator, a first temperature and pressure reduction device, working equipment, power equipment, aheating network heater, a hydrophobic heat exchanger, a heating network circulating pump, a hot water heat accumulator, a first circulating pump, a second circulating pump and a radiator. According tothe heat storage coupling steam extraction integrated system used for combined cycle energy gradient utilization and the operation method of the heat storage coupling steam extraction integrated system, based on the principle of energy gradient utilization, combined with the mode of steam waste energy utilization, integrated design of different steam extraction modes is conducted, the hot electrolysis coupling operation capacity of a 6FA type combined cycle unit is effectively improved, meanwhile the hot water heat accumulator is used, the peak load regulation capacity of the combined cycle unit is improved, and the external heating supply capacity of the combined cycle unit under full 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 heat storage coupled steam extraction integrated system for cascade utilization of combined cycle energy 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...

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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 (Application 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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