Energy storage device with steam as energy storage medium

Abstract

The invention discloses an energy storage device with steam as an energy storage medium, and belongs to the field of energy storage and transportation. The device is characterized in that a certain amount of gas-liquid mixed working media are sealed in steam energy storage rods of hollow structures, in the heat absorption and heat release process of the steam energy storage rods, the gas-liquid working media in the structures are gasified or liquefied, the total space where the gas-liquid working media are located is not changed, the pressure in the structures is increased in the heat absorption process, and the pressure in the structures is reduced in the heat release process; and the plurality of variable-pressure constant-volume steam energy storage rods are fixed in the shell type energy storage device through a tube plate, the energy storage device is provided with a shell-and-tube heat exchanger structure, a tube pass is replaced by the steam energy storage rods, a shell pass is provided with two outlets and two inlets, heat release media and heat absorption media alternately flow in a shell of the energy storage device under the control of four valves, when the heat release media flow through, the steam energy storage rods absorb heat, an internal liquid phase is gasified, so that the heat is stored in the steam of the energy storage rods, when the heat in the energy storage device needs to be taken, the heat absorption media flow through the steam energy storage rods, the steam heat of the steam energy storage rods is transferred to the heat absorption media, and an internal gas phase is condensed. Compared with a traditional solid-liquid phase change energy storage device, the energy storage device with the steam as the energy storage medium has the advantages of being large in unit mass energy storage amount, high in heat absorption and release speed, high in heat absorption and release efficiency and stable in working medium thermodynamic property, and the working medium used for energy storage is wide in source.

Description

technical field [0001] An energy storage device using steam as an energy storage medium belongs to the field of energy storage storage and transportation. Background technique [0002] There is often a mismatch between the generation and use of energy. For example, the electricity consumption during the day is significantly greater than the electricity consumption at night, so the designed power plant capacity has redundancy at night. Simply reducing the load of the power plant will generate electricity. The reduced efficiency is also not conducive to its safe and economical operation, so there is a technical demand for energy storage. Energy storage and transportation technology is also widely used in building energy saving, solar energy utilization and waste heat recovery and other occasions. Currently widely used energy storage materials are a variety of organic or inorganic materials based on liquid-solid phase transitions, which have the advantage of small volume chang...

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Problems solved by technology

But at the same time, there are also the disadvantages of low energy storage per unit mass and low solid-phase thermal conductivity, which reduces the rate of heat storage and heat release. In addition, most liquid-solid phase change materials have the problem of overcooling, which requires more cooling during the heat release process. Low ambient fluid temperature, which further reduces system efficiency

However, the gas-liquid phase change heat storage material has the problem of too large a volume change rate, which leads to a complex structure of the heat exchanger containing the material

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