Gas and steam combined cycle unit steam extraction integrated heating system and operation method thereof

Abstract

The invention relates to a gas and steam combined cycle unit steam extraction integrated heating system and an operation method thereof, and belongs to the technical field of combined heat and power generation. The gas and steam combined cycle unit steam extraction integrated heating system comprises a gas turbine set and a steam turbine set, wherein the gas turbine set comprises a gas turbine compressor, a gas turbine combustion chamber, a gas turbine and a first power generator, and the steam turbine set comprises an exhaust-heat boiler, a steam turbine high-pressure cylinder, a steam turbine intermediate-pressure cylinder, a steam turbine low-pressure cylinder, a second power generator, a condenser, a condensation water pump, a gland heater, a deaerator, a first temperature reduction and pressure reduction device, a second temperature reduction and pressure reduction device, a third temperature reduction and pressure reduction device, acting equipment, power equipment, a heater fora heating network, a drainage heat exchanger and a circulating pump for the heating network. According to the gas and steam combined cycle unit steam extraction integrated heating system and the operation method thereof, on the basis of an energy gradient utilization principle, integrated design of different steam extraction modes is performed, so that the thermoelectric decoupling operation capability of the combined cycle unit is effectively improved, and the heating requirements of residents are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of cogeneration of heat and power, and in particular relates to a heating system for integrated steam extraction of a gas-steam combined cycle unit 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 heat for heating, which not only i...

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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