Electric heat pump and heat storage device combined thermal station system

Abstract

The invention belongs to the field of thermoelectricity and relates to a thermal station system adopting a water-water heat exchanger, an electric heat pump and a heat storage system which are combined for usage. The basic component elements of the system include the water-water heat exchanger, the electric heat pump and the heat storage system. It can be achieved that primary grid return water temperature is lower than secondary grid return water temperature by adopting the water-water heat exchanger, the electric heat pump and step-by-step release of primary grid hot water heat. A heat storage device is added and adopts a heat storage mode and a heat release mode according to peak and valley electric charges of a power grid in different time periods. The electric heat pump is intermittently opened and closed, an intermittent operating mode is adopted, the operating cost of the system is reduced, and meanwhile lower primary grid return water temperature is ensured. Compared with a conventional thermal station, the primary grid return water temperature is remarkably reduced, the temperature difference of supplied water and return water is increased, accordingly the primary grid water heat supply capability is improved, and the heat storage device is added and has the positive effect on relieving of large peak and valley difference of electrical loads of the urban power grid during the day and night.

Description

technical field [0001] The invention belongs to the technical field of thermoelectricity, and in particular relates to a heat station system in which an electric heat pump and a heat storage device are combined. Background technique [0002] my country's urbanization is developing very rapidly. In northern my country, the heating industry belongs to the people's livelihood industry. The contradiction between the rapidly growing urban heating demand and the increasingly saturated heating pipeline network is becoming increasingly prominent. Therefore, improving the transmission capacity of the heating pipeline network has become an important research. topic. Although further increasing the water supply temperature of the primary network can increase the temperature difference between the supply and return water, thereby increasing the heat transfer capacity of the heating network, but the current water supply temperature of the urban heating network mostly reaches the upper lim...

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Problems solved by technology

Although further increasing the water supply temperature of the primary network can increase the temperature difference between the supply and return water, thereby increasing the heat transfer capacity of the heating network, but the current water supply temperature of the urban heating network mostly reaches the upper limit of the heating temperature, and continuing to increase the heating temperature will exceed the pipe material. Temperature limit

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