A solid-state heat storage and heating characteristic matching design method based on heat transfer rate balance

Abstract

The invention relates to a solid-state heat storage and heating characteristic matching design method based on heat transfer rate balance, which comprises the following steps of 1) obtaining structural data, material data and operating condition parameters of a high-temperature solid-state heat storage device; 2) establishing a heat transfer rate balance model between that high-temperature heat storage material and the electric resistance heating element; 3) establishing a heat transfer model between the high-temperature heat storage material and the electric resistance heating element according to the heat transfer rate balance model; 5) determining a heat transfer couple boundary condition between the air and the surface of the electric resistance heating element; 6) judging whether thesurface temperature of the electric resistance wire is in an operating temperature range. 7) obtaining the air inlet velocity parameter satisfying the design structure of the air duct of the regenerator and the operation temperature range, so that the structure and the performance of the electric heat element and the heat storage device are matched, thereby realizing the optimization of the wholestructure. (1) The rate of change of temperature is constant, according to which the heat transfer equilibrium equation can be calculated. (2) The heat storage material and the resistance wire match.(3) The shortening of the life of the electric heating element caused by the high temperature brittleness is avoided.

Description

technical field [0001] The content of the invention belongs to the field of design optimization of high-temperature solid-state heat storage, and relates to a matching design optimization method of solid-state heat storage heating characteristics based on fluid-solid multi-field heat transfer rate balance. Background technique [0002] Solid-state high-temperature heat storage is a new type of low-cost, large-capacity heat storage method. It has broad application prospects in high-temperature heat storage, thermal power plant peak regulation and other fields. The energy storage conversion system converts electrical energy into thermal energy and stores it in the thermal storage material. The thermal energy is released only during the heat load demand period. In the four energy transfer processes of electrothermal energy conversion, heat storage, heat transfer, and heat exchange, the system effectively realizes Electrothermal decoupling and thermoelectric isolation. In recen...

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Problems solved by technology

[0003] The heat storage energy storage device stores the heat energy generated by surplus electricity or discarded electricity in the heat storage material through the electric heating device. The resistive alloy heating element needs to withstand the high temperature of several hundred degrees Celsius after being energized, and the temperature may drop when the heat is released. Below 100°C, working in a large temperature range, the heating element is prone to overheating and fatigue under repeated heating and cooling, which seriously affects the life of the heating element and causes frequent maintenance.

[0004] In addition, in the design of solid-state heat storage devices, if the design surface load of the electric heating element is higher than the heat transfer rate of the heat storage material, the heat generated by the resistance wire will exceed the absorption rate of the heat storage body, and the accumulated heat energy will be converted into temperature rise, which is too high , which will shorten the service life of the resistance wire and affect the reliability and economical operation of the heat storage device

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