Full liquid type medium and high temperature heat accumulator and application thereof in flue gas waste heat recovery

Abstract

A full liquid type medium and high temperature heat accumulator comprises a box body, a plurality of trays, a plurality of screens, multi-hole quality composite phase change heat storage layers and a heat exchanging pipe, wherein the inner portion of the box body is filled with saturation liquid of working medium, the plurality of trays are respectively and horizontally fixed on the inner wall of the lower portion of the box body, the plurality of screens are respectively arranged at the bottom of each tray, the multi-hole quality composite phase change heat storage layers are respectively paved on the screens, the multi-hole quality composite phase change heat storage layers are formed by composite phase change heat storage materials in an accumulating mode and completely immersed in the saturation liquid of the working medium, the heat exchanging pipe is arranged in an inner cavity of the upper portion of the box body, a pipe cavity of the heat exchanging pipe is isolated from the inner portion of the box body and communicated with the outer portion of the box body, and the heat conducting working medium is in the box body in a flowing mode. The invention further discloses a medium and high temperature flue gas waste heat utilization heat collecting or heat storage system composed of the full liquid type medium and high temperature heat accumulator, and a lower level heat exchanger is used for continuously supplying heat in the range of 200 DEG C to 400 DEG C. The full liquid type medium and high temperature heat accumulator and application of the full liquid type medium and high temperature heat accumulator in flue gas waste heat recovery has the advantages of being excellent in heat exchanging ability, simple in structure and long in service life.

Description

technical field [0001] The invention relates to equipment for utilizing waste heat of high-temperature flue gas in industry, in particular to a liquid-filled type medium-high temperature heat accumulator and its application in recovery of waste heat of flue gas, belonging to the technical field of energy. Background technique [0002] Energy conservation is an important part of my country's basic national policy of energy conservation and emission reduction, and a long-term strategic task for the sustainable development of my country's national economy and society. As a large energy consumption country, my country has low energy utilization rate and serious waste. Reasonable use of industrial flue gas waste heat can improve energy utilization efficiency and effectively save energy. For example, using waste heat to preheat furnace materials and combustion air can improve the combustion efficiency of boilers. Flue gas waste heat can also be used to produce medium-high temperat...

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Problems solved by technology

However, the overall heat storage performance of the above devices is not high

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