Flue gas waste heat recovery element and device capable of breaking through low temperature dew point

Abstract

The invention relates to a flue gas waste heat recovery element and device capable of breaking through the low temperature dew point. The flue gas waste heat recovery element and device is characterized in that a heat exchange element is formed by an aluminum flat-oval-tube-shaped fin and aluminum fluid tubes; corrosion resistant, abrasion resistant and high temperature resistant ceramic glaze materials are composited on the surface of the heat exchange element; and an unsaturated contraction high polymer heat-shrink tube is wrapped on the outer surfaces of the ceramic glaze materials. The heat exchange element is fixed through an enameled steel plate to form a single module, a plurality of the single modules are combined in parallel connection mode to form a heat exchanger assembly, and all the fluid tubes of the heat exchange element are welded in series connection mode through bends. Liquid cold fluid is filled into the fluid tubes of the heat exchange element, three air cold fluid channels are arranged between the flat-oval-tube-shaped fin and the aluminum fluid tubes, and air hot fluid flows through the outer side of the flat-oval-tube-shaped fin. The flue gas waste heat recovery element and device has the advantages that a heat exchange tube is formed in once extruding mode, the fin is sufficiently contacted with the fluid tubes, accordingly heat exchange efficiency is improved and a large amount of labor work is reduced; the inner walls of the fluid tubes are designed to be tooth-shaped, the internal surface heat exchange areas of the fluid tubes are increased, and the heat exchange efficiency is led to be high; the heat exchange channels are additionally arranged so that use functions of a heat exchanger are increased; the surface is subjected to enameling processing and high polymer heat-shrink tube processing so that corrosion resistance, abrasion resistance and high temperature resistance are greatly improved; and the self-cleaning purpose is achieved, and normal and efficient heat exchange is ensured.

Description

technical field [0001] The invention relates to a HVAC heat exchange element, in particular to a flue gas waste heat recovery element and device that breaks through the low temperature dew point. Background technique [0002] With the deepening of energy-saving work, the exhaust gas temperature of heating furnaces and boilers is required to be lower and lower. As a result, strong low-temperature dew point corrosion often occurs on the heat exchange surfaces of waste heat recovery equipment such as air preheaters and economizers. Seriously affected the safe operation of heating furnace and boiler. Therefore, low temperature dew point corrosion has become the main obstacle to reduce boiler exhaust gas temperature and further improve boiler thermal efficiency. [0003] Mechanism of low temperature dew point corrosion Generally, fuels contain a small amount of sulfur, and all sulfur will generate SO after combustion 2 . Due to the presence of excess oxygen in the combustion c...

AI Technical Summary

Problems solved by technology

The main heat exchange element of the surface heat exchanger is the heat exchange tube. At present, the technology of the heat exchange tube is limited to the welding of various finned tubes, or the fins are wound on the steel pipe. The welding requirements of the former are high and large-scale equipment is required for welding. , it is easy to deform after welding, the material of the tube sheet is thickened, the cost is high, and the heating area is limited; the latter is wound on the steel pipe, due to the small spacing, it is not conducive to the compounding of non-metallic materials, and it is impossible to coat and prevent corrosion. Severe dust accumulation, unable to operate safely for a long time in acid-base corrosive gas / liquid

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