High-capacity medium-temperature phase-change heat storage and heat release system for thermal power plant and heat storage and heat release method of system

Abstract

The invention discloses a high-capacity medium-temperature phase-change heat storage and heat release system for a thermal power plant, and relates to a heat storage system. The system comprises a closed circulating system, a constant-pressure system, a draining system, a water supply pipeline, a water return pipeline, flow measuring devices, a steam pipeline and a safety valve; a heat storage heater and a heat release cooler are connected with a heat storage device and are both connected with the first flow measuring device; the heat storage device is sequentially connected with the constant-pressure system, a closed circulating pump and the first flow measuring device; a desalted water system is connected with a high-pressure expansion water tank, and the high-pressure expansion water tank is connected with the heat storage device; one end of each heat supply network draining pump is connected with the heat storage device, and the other end of each heat supply network draining pump is sequentially connected with a second water level adjusting valve set and a water return pipe network. According to the high-capacity medium-temperature phase-change heat storage and heat release system for the thermal power plant, rolling supports arranged at the bottom of the system absorb heat to be expanded, therefore, an expansion joint arranged on the heat storage device is removed, and the effect is good. The invention further relates to a heat storage and heat release method of the high-capacity medium-temperature phase-change heat storage and heat release system for the thermal power plant.

Description

technical field [0001] The invention relates to a heat storage system, in particular to a large-capacity medium-temperature phase-change heat storage and release system for thermal power plants. The invention also relates to the heat storage and release method of the large-capacity medium-temperature phase-change heat storage and release system of the thermal power plant. Background technique [0002] In my country's "Three North Regions" power structure, thermal power and wind power occupy a high proportion. However, wind power and thermal power have not achieved coordinated development, and there is a serious "wind-heat conflict". On the one hand, the heating season in the Sanbei region lasts for more than half a year, and there are a large number of cogeneration units in the power system for heating demand in winter. The combined heat and power unit operates in the mode of "power fixed by heat", and its power generation output is greatly restricted by the heating load in...

AI Technical Summary

Problems solved by technology

However, the existing heat storage system uses a U-shaped tubular pressure vessel, and the two ends of the pressure vessel adopt the structure of an elliptical plug head water chamber. The above-mentioned existing heat storage system is a pressure vessel, which is large in size and difficult to transport. , the finished product is high

At the same time, the flow direction of the fluid in all heat transfer finned tubes of the existing heat storage system is the same, which causes the temperature at the inlet and outlet of the heat storage device to be inconsistent. area remains liquid

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