Step heat storage temperature control system and temperature control method based on phase change energy storage technology

Abstract

The invention provides a step heat storage temperature control system and temperature control method based on a phase change energy storage technology, and belongs to the technical field of phase change heat storage. According to the technical scheme, the step heat storage temperature control system comprises a high-temperature heat source, a solar heat collector, a normal-temperature water source and a temperature control system. The high-temperature heat source flows out of an evaporator through a waste heat pipe, an inlet and an outlet of the evaporator are connected through a heat exchange circulating pipe, and the heat exchange circulating pipe is sequentially connected with a compressor, a step heat storage device and a liquid storage tank; an inlet and an outlet of the solar heat collector are connected through a heat collection circulating pipe, and the heat collection circulating pipe is connected with the step heat storage device. The normal-temperature water source flows out through the step heat storage device and to-be-heated equipment through a heat supply circulating pipe; the temperature control system comprises a controller, a temperature control ball valve and a temperature sensor, wherein the temperature control ball valve and the temperature sensor are arranged on the heat supply circulating pipe. The step heat storage temperature control system and temperature control method based on the phase change energy storage technology has the beneficial effects that through the heat exchange design of different temperature gradients, the storage rate of heat energy is increased, the performance and efficiency of a phase change energy storage device are greatly improved, the heat exchange speed of the heat energy is increased, and the application performance of the phase change energy storage device is improved.

Description

technical field [0001] The invention relates to the field of phase change heat storage technology, in particular to a cascaded heat storage temperature control system and temperature control method based on phase change energy storage technology. Background technique [0002] The basis of phase change heat storage technology is phase change materials, which occur under isothermal or near-isothermal conditions during phase change. Therefore, during the process of energy storage and energy discharge, the temperature and heat flow are basically constant, and accompanied by Lots of heat absorbed / released. Phase change heat storage mainly relies on the latent heat of phase change materials, which has the characteristics of large latent heat and high heat storage density, which is an order of magnitude larger than sensible heat. Since the oil crisis in the 1970s, thermal energy storage technology has been widely used in industrial energy conservation and new energy fields. The ap...

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Problems solved by technology

[0003]In industrial production, a large amount of waste heat is usually generated, which is generally discharged directly into the atmosphere, and a large amount of heat will be directly dissipated in the air, which not only It will seriously reduce the thermal efficiency of the system, and will cause thermal pollution to the environment; solar energy is a green new energy, which has the advantages of renewability, universality and huge energy, but its disadvantages are discontinuity and volatility

Especially in the petroleum industry, due to the high temperature of wellhead crude oil, flash evaporation usually occurs, which not only leads to the complete loss of part of the crude oil, but also wastes most of the heat

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