Combined circulating device based on coupling of heat supply and electric power peak regulation and operating method thereof

Abstract

The invention relates to a combined circulating device based on coupling of heat supply and electric power peak regulation and an operating method thereof, and belongs to the technical field of combined heat and power generation. The combined circulating device comprises a gas turbine unit and a steam turbine unit; based on the energy gradient utilization principle, integrated design of differentsteam extraction modes is conducted, the operating capacity of a thermal electrolysis coupler of a combined circulating unit is effectively improved, and the heating requirements of residents are ensured; and meanwhile, a steam heat storage system is coupled with the combined circulating unit, collaborative matching of electric power peak regulation and heat supply of the combined circulating unitis achieved, and moreover, the electric power peak regulation capacity of the combined circulating unit operating in the pure solidification working condition is improved. After the combined circulating device is applied, the working capacity loss in the heat supply process is effectively reduced while the external heat supply capacity of the combined circulating unit is deeply exploited, in addition, the current severe electric power peak regulation policy requirements are met, the deep peak regulation capacity of a thermal power generating unit is achieved, the requirement of a power grid for unit peak regulation is met, and the high practical application value is achieved.

Description

technical field [0001] The invention belongs to the technical field of cogeneration of heat and power, and in particular relates to a combined cycle device based on the coupling of heat supply and power peak regulation and an operation 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 heat for heating, which not onl...

AI Technical Summary

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

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