Energy storage peak regulation system based on thermal Rankine cycle

Abstract

A Rankine cycle energy storage peak regulation system based on heating power mainly comprises a medium-pressure heat storage tank, a low-temperature water storage tank, a flash tank, a medium-pressure heat storage tank circulating pump, a heat storage water feeding pump and an electric steam boiler. The method is characterized in that steam heat energy during a new energy peak regulation period of a pure condensing power plant boiler is stored in a medium-pressure heat storage tank in a saturated water state; new energy electric power energy is converted into saturated water to be stored in the medium-pressure heat storage tank; in the non-new energy peak regulation period of a pure condensing power plant boiler, saturated water in a medium-pressure heat storage tank is pressurized and mixed into boiler feed water, regenerative extraction steam of a steam turbine heater is squeezed, stored energy is recycled, the power capacity of a steam turbine is increased, the coal burning amount of the boiler is reduced, and energy storage and energy release of boiler steam and new energy electric energy in a thermal Rankine cycle system are achieved; and the system serves deep peak regulation of new energy.

Description

technical field [0001] The invention belongs to the field of thermal power thermal energy and new energy energy energy storage and peak regulation, in particular to a thermal Rankine cycle-based energy storage peak regulation system. Background technique [0002] For power generation bases rich in new energy in desert and Gobi areas, thermal power flexibility transformation, gas power generation, pumped storage, and other new energy storage are all effective means to improve the peak-shaving capacity of the power system, and should be vigorously promoted. However, the proportion of gas-fired power generation, pumped storage, and other new types of energy storage is limited by many factors such as construction conditions, construction and operation costs, construction period, and technological maturity. The main power source of coal power and energy storage capacity play an important role in the improvement of the peak regulation capacity of the power system. [0003] The fl...

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Problems solved by technology

[0003] The flexibility of thermal power operation includes three main parts: peak shaving capacity, climbing speed, and start-stop time. Most of the boilers of thermal power units now use once-through boilers. Due to the limitation of the minimum operating flow rate of the boiler water wall, the minimum load of the boiler dry operation is not low. At 30% of the rated flow, the wet operation of the boiler limits the climbing speed of the unit, and the dry operation of the boiler can meet the flexibility requirements of the unit. During the new energy peak-shaving period, it is necessary to develop the low-load energy storage capacity of thermal power units to reduce the power generation of coal-fired power units. A system that releases energy to increase the power generation of coal-fired power units during non-new energy peak-shaving periods

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