Waste heat recovery based flexible peak regulation system and method for thermal power generating unit

Abstract

The invention relates to a waste heat recovery based flexible peak regulation system and method for a thermal power generating unit. The system comprises a steam turbine, a generator, a compression type heat pump, a heat user, a heat storage tank, a cold storage tank and a heater for heating network, wherein the steam turbine is connected with the heater for heating network, and the heater for heating network is connected with the compression type heat pump to form a peak heating system; the heat user is connected with the heat storage tank and the cold storage tank to form a heat storage and cold release system; the compression type heat pump is connected with the generator to form a heat pump driving system; and the compression type heat pump is connected with the heat storage tank and the cold storage tank through a hot water pipeline to form a waste heat recovery and cold storage system. According to the waste heat recovery based flexible peak regulation system and method for the thermal power generating unit, heating network high-temperature return water is combined with the compression type heat pump system, the purpose of flexible peak regulation of the heat supply unit is achieved by consuming the on-grid electric quantity at an outlet of the generator of the unit, reducing the heating steam extraction flow of the unit and reducing the output capacity and the on-grid electric quantity of the unit, the overall peak regulation capacity and the waste heat utilization space of the unit are further improved, new energy consumption is promoted, and the use efficiency of primary energy is enhanced.

Description

technical field [0001] The invention belongs to the technical field of thermal power generation, and in particular relates to a flexible peak-shaving system and method for thermal power units based on waste heat recovery. Background technique [0002] At present, in order to vigorously promote the clean reform of the energy structure, the installed capacity of wind power (wind power) and solar power has grown rapidly, but new energy has the characteristics of randomness, intermittentity, and instability. After its proportion increases to a certain extent, it will inevitably lead to The difficulty of peak regulation in the power grid, coupled with the overcapacity of traditional coal-fired power generation, requires the active thermal power units to improve their flexibility and deep peak regulation capabilities to maintain the stability of the power grid. Capabilities are contradictory, so realize the flexible peak regulation of thermal power units with waste heat recovery, ...

AI Technical Summary

Problems solved by technology

[0002] At present, in order to vigorously promote the clean reform of the energy structure, the installed capacity of wind power (wind power) and solar power has grown rapidly, but new energy has the characteristics of randomness, intermittentity, and instability. After its proportion increases to a certain extent, it will inevitably lead to The difficulty in peak regulation of the power grid, coupled with the overcapacity of traditional coal-fired power generation, requires the active thermal power units to improve their flexibility and deep peak regulation capabilities to maintain the stability of the power grid. Capabilities are contradictory, so realize the flexible peak regulation of thermal power units with waste heat recovery, solve the increasingly prominent problems of grid load overload, excess wind power, and insufficient heating of thermal power units, improve the overall peak regulation capacity of units and space for waste heat utilization, and promote new energy Consumption, enhancing the efficiency of primary energy use has become an urgent need

Images