Deep peak shaving system of thermal power plant

Abstract

The invention discloses a deep peak shaving system of a thermal power plant. The deep peak shaving system comprises a superheater, a reheater, a high-pressure cylinder, a reheating steam electric regulating valve, a main steam electric regulating valve, a medium-pressure cylinder, a low-pressure cylinder, a condenser, a condensation water pump, a low-pressure heating water feeding heat exchanger,a water feeding pump set, a deaerator, a high-pressure heating water feeding heat exchanger, a steam turbine low-pressure steam extraction system, four-stage extraction, a steam turbine high-pressuresteam extraction system, a high-temperature molten salt water feeding heat exchanger, a high-temperature molten salt pump, a high-temperature molten salt storage tank, a low-temperature molten salt storage tank, a low-temperature molten salt pump, a molten salt preheater, a steam condensation type heat exchanger, a steam non-condensation type heat exchanger, a steam pressure reduction device and the like. According to the system, the molten salt heat storage technology is utilized, redundant steam heat is stored during load reducing peak shaving of a unit, in the process of load increasing peak shaving of the unit, high-temperature molten salt is used for heating high-pressure fed water to reduce steam extraction of a steam turbine, the output of the steam turbine is increased, the heat efficiency of the unit is improved, and the flexible and deep peak shaving of the thermal power plant is realized.

Description

technical field [0001] The invention relates to a flexible reconstruction scheme of a thermal power plant, in particular to a deep peak-shaving system of a thermal power plant capable of realizing deep peak-shaving of a thermal power plant. Background technique [0002] The domestic power energy structure is constantly being adjusted, and the installed capacity of renewable energy is increasing. The intermittent and unstable nature of renewable energy poses a certain degree of hidden danger to the safe operation of the power grid. In order to increase the consumption of renewable energy, it is necessary to increase the thermal power unit. Flexibility to ensure the stability of electricity load. In addition, the single-unit capacity of thermal power units continues to increase, resulting in an increase in the range from low load to high load of the unit, and poor power regulation performance during peak and valley regulation. Especially during the nighttime peak shaving proc...

AI Technical Summary

Problems solved by technology

In addition, the single-unit capacity of thermal power units continues to increase, which leads to an increase in the range from low load to high load of the unit, and poor power regulation performance during peak and valley adjustments.

Especially during the peak-shaving process of the unit at night, the load of the power grid is less than the minimum stable combustion load of the boiler, resulting in a waste of energy. How to use this part of energy is the key task of current research

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