A flue gas waste heat recovery system based on membrane absorption

Abstract

The invention belongs to the technical field of gas boiler smoke waste heat recycling and film absorption, and relates to a smoke waste heat recycling system based on film absorption. The system comprises a gas boiler, a vacuum film water recoverer, a film bundle heat exchanger, an indirect heat exchanger, an air preheater, a heat supply pipe net, a chimney and the like. Smoke passes through a vacuum hollow fiber film bundle in the vacuum film water recoverer, water steam in wet smoke is separated from dry smoke, the dry smoke obtained after separation sequentially passes through the indirectheat exchanger and the air preheater, return water and air are heated through waste heat, meanwhile, the separated water steam enters the film bundle heat exchanger, primary heated return water in thewater tightness hollow fiber film bundle is further heated and is sent into the boiler or nearby secondary pipe net users, the water steam obtained after heat exchange is condensed, and water can bedirectly supplemented for the boiler. The system can achieve smoke dry and wet separation, heat energy in the water steam and the dry smoke obtained after separation can be efficiently utilized, waterresources are saved, and the phenomenon of chimney white smoke discharging is reduced.

Description

technical field [0001] The invention belongs to the technical field of gas boiler flue gas waste heat recovery and utilization and membrane absorption, and in particular relates to a flue gas waste heat recovery system based on membrane absorption. Background technique [0002] The main component of natural gas is methane, which will produce a large amount of water vapor after combustion. Since the exhaust gas temperature is generally 180-250 °C, part of the sensible heat and all latent heat in the water vapor will be discharged into the atmosphere together with the exhaust gas, causing heat Loss and waste of water resources, in order to reduce energy waste and save water resources, it is necessary to perform deep heat recovery and water recovery on the waste heat of flue gas. [0003] The current waste heat recovery methods include direct contact heat exchange and indirect heat exchange. The indirect heat exchange has a large footprint, large heat transfer resistance, insuf...

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Problems solved by technology

[0003] The current waste heat recovery methods include direct contact heat exchange and indirect heat exchange. The indirect heat exchange has a large footprint, large heat transfer resistance, insufficient heat exchange, and requires the heat exchanger to have high corrosion resistance. ability

Although direct contact heat exchange can fully recover the sensible heat of the flue gas and most of the condensation heat of the flue gas, the water after the heat exchange between the flue gas and water is acidic and cannot be used directly, resulting in a lot of waste of water resources

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