A boiler flue gas deep waste heat recovery device for thermal power plant

Abstract

A kind of boiler exhaust gas depth waste heat recovery device of thermal power plant, including heat preservation shell and flue on boiler and first heat preservation mechanism being arranged in heat preservation shell, and heat preservation mechanism is communicated with flue, heat preservation shell and heat preservation mechanism form heat preservation cavity, heat preservation cavity is communicated with flue, so that the flue gas of delivery can fill the heat preservation cavity, secondly, another heat preservation cavity is formed between the inside of heat preservation cavity and heat preservation mechanism, due to the utility model is equipped with multiple groups of heat exchange pipe fittings with fin from bottom to top in heat exchange box, its both ends extend to the inside of two sides guide box, multiple independent passages are formed by multiple layers of guide plate in guide box, after being forced to enter from bottom delivery port, flue gas must flow through each group of heat exchange pipe fittings in turn and zigzag, form a serpentine elongated flow channel from bottom to top, this structure greatly increases the journey and residence time of high-temperature flue gas in heat exchange box, makes it and the medium outside heat exchange pipe fitting carry out sufficient heat exchange, significantly improves heat exchange efficiency and waste heat recovery rate.

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