Condensation-type air-preheating flue gas waste heat recycling device

Abstract

The invention provides a condensation-type air-preheating flue gas waste heat recycling device. The device comprises a flue component for collecting flue gas generated by a combustion module; by structural cooperation of a condensation outer shell and a condensation inner shell of the flue component, an air inlet, a condensation inner chamber, a gas outlet and a gas exhausting opening form an air passing passage for replenishing air to the combustion module; a flue gas opening, a condensation chamber and a condensation pipe form a flue gas passing passage for heat exchange of flue gas and air which is in the air passing passage; when the fuel in the combustion module is combusted, the condensation outer shell and the condensation inner shell are in a negative pressure state, so air can be replenished to the combustion module in time along the air passing passage so as to guarantee that the fuel in the combustion module can be fully combusted. Meanwhile, under the effect of an exhaust fan, high-temperature exhausted flue gas and water steam generated after production of a gas module can flow outwards along the flue gas passing passage at equal pressure uniformly to realize that sensible heat in the high-temperature exhausted flue gas generated by the gas module and latent heat released from condensation of the water steam can be used for uniformly preheating the replenished air, so the thermal efficiency of the gas module is improved, energy consumption is reduced, the temperature of the flue gas can also be reduced, and an expected energy-saving environmental protection effect can be played.

Description

technical field [0001] The invention relates to the field of gas boilers, in particular to a condensing air preheating flue gas waste heat recovery device. Background technique [0002] Condensing gas modular furnace is a new type of central heating equipment, which has remarkable energy-saving and environmental protection effects. It is widely used in large-scale central heating and heating in factories, office buildings, commercial and residential areas, hospitals, supermarkets, hotels, bath centers, swimming pools, etc. water. [0003] Several gas modules are installed in the furnace body of the gas module, and the gas modules communicate with the smoke outlet above the furnace body through the smoke collecting pipe. Because the gas module mainly uses natural gas or coal gas as fuel. According to the fuel combustion formula (for example, natural gas CH4+2O2=CO2+2H2O) and the ratio of air and oxygen: when the gas module is working, it needs more than 10 times the air s...

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Problems solved by technology

[0006] The use of condensing heat exchangers can absorb more flue gas sensible heat and part of the latent heat of water vapor condensation. However, in the actual application of building heating, due to the restriction of the lower limit of the heating return water temperature, the use of heating return water condensation heat exchange, It is difficult for the exhaust gas temperature of the boiler to drop below 60 degrees. According to the relationship between condensate precipitation and temperature, some condensate water does not precipitate at an exhaust gas temperature of 60 degrees.

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