A cascaded peak-shaving system and its operating method for improving thermal power flexibility of thermal power units

Abstract

The invention relates to a stepped peak shaving system for improving thermal power flexibility of a thermoelectric unit and an operating method thereof. A measure for effectively improving the peak shaving capacity of the thermoelectric unit is not available yet at present. The stepped peak shaving system for improving thermal power flexibility of the thermoelectric unit comprises a boiler, a steam turbine, a power generator, an electric stove, a heat consumer, a current and voltage regulating device, a main steam pipe, a heat reheating steam pipe, a cold reheating steam pipe and a heat supply steam extraction pipe. The stepped peak shaving system for improving thermal power flexibility of the thermoelectric unit is characterized in that the stepped peak shaving system further comprises a temperature and pressure decreasing device, a main steam branch, a heat reheating steam branch and a cold reheating steam branch; the heat reheating steam pipe is connected with the temperature and pressure decreasing device through the heat reheating steam branch, and the main steam pipe is connected with the temperature and pressure decreasing device through the main steam branch; one end of the cold reheating steam branch is connected to the cold reheating steam pipe, and the other end of the cold reheating steam branch is connected to the temperature and pressure decreasing device; and the temperature and pressure decreasing device is connected with the heat consumer through a pipeline. The stepped peak shaving system for improving thermal power flexibility of the thermoelectric unit and the operating method thereof are reasonable in design and reliable in performance, and load peak shaving of the thermoelectric unit can be achieved easily.

Description

technical field [0001] The invention belongs to the field of improving the flexibility of thermal power plant units, and in particular relates to a cascaded peak-shaving system and an operation method for improving the thermal power flexibility of thermal power units, and is especially suitable for deep peak-shaving thermal power units. 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. By the end of 2012, my country had installed wind power capacity of 44.8GW. However, wind power has strong randomness, intermittency, uncontrollability and anti-peaking characteristics, which gradually increases the difficulty of thermal power units in power grid peaking. In order to effectively consume new energy resources, the country has gradually increased the policy requirements for peak regulation of thermal power units. The regulations require that the clean ...

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Problems solved by technology

The publication date is January 19, 2011, and the Chinese patent with the publication number CN101950964A discloses a system and scheduling method including combined heat and power units and pure condensing thermal power units, but it has not really improved the flexibility of the units. function of

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