Heat regeneration and storage system of thermal power generating unit used for load response and operating method of heat regeneration and storage system

Abstract

The invention relates to a heat regeneration and storage system of a thermal power generating unit used for load response, and an operating method of the heat regeneration and storage system. Peak load regulating potential is tapped and a load response ratio is increased for the thermal power generating unit, so that market competitiveness of the thermal power generating unit is effectively improved. According to the heat regeneration and storage system disclosed by the invention, a boiler, a steam turbine high-medium-pressure cylinder, a steam turbine low-pressure cylinder, a condenser, a condensate pump, a low-pressure reheating heater, a deaerator, a water feeding pump and a high-pressure reheating heater are sequentially connected; a low-temperature water port of a hot water heat-storage device is separately connected with a water feeding outlet of the condensate pump and a hot water inlet of a steam-water heat exchanger; a high-temperature water outlet of the hot water heat-storage device is separately connected with a water feeding inlet of the deaerator and a hot water outlet of the steam-water heat exchanger; and a steam inlet of the steam-water heat exchanger is connectedwith a steam outlet of the steam turbine high-medium-pressure cylinder. The heat regeneration and storage system avoids work doing ability loss of high-quality electric energy, stores and releases heat by medium-low-temperature steam subjected to work doing in the gas turbine high-medium-pressure cylinder, changes outlet pressure of the gas turbine low-pressure cylinder to realize unit load response, and realizes gradient utilization of high-parameter steam.

Description

technical field [0001] The invention relates to a heat recovery heat storage system and an operation method of a thermal power unit for load response, which belong to the technical field of flexibility improvement of thermal power units, and are especially suitable for 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 space for clean energy consumption should be improved,...

AI Technical Summary

Problems solved by technology

At present, the main technical solutions for peak regulation through heat storage are: (1) The Chinese patent application number 201710774789. In this way, the excess electricity during the low period of electricity consumption is converted into heat for storage, and then released during the peak period of electricity consumption; but its disadvantage is that the conversion of electric energy into heat storage seriously wastes the working ability of high-grade energy

(2) The Chinese patent with the application number 2001610340023.6 "A heat storage system and operation method for thermal power plant peak regulation and heat storage", through the heat storage device, during the low power consumption period, the unit increases steam extraction for heat storage, Thereby reducing the output of the unit; during the peak period of electricity consumption, the stored heat is released for heating, reducing the heating and steam extraction of the unit, thereby increasing the output of the unit; The crew cannot use the technology

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