A condensing gas flue gas waste heat recovery device

Abstract

The invention relates to a condensed gas waste heat recovery device which is an energy-saving environment-friendly product related to a gas boiler. The condensed gas waste heat recovery device adopts an A, B and C three-level integrated structure, condensation and heat exchange are perfumed level by level, the A level is used for heating supplied water of the boiler, the B level is used for heating blowing air of the boiler, and the C level adopts a low temperature heat transfer element and is subject to forcible convection and heat exchange with outdoor cold air, exhaust smoke temperature of the boiler is reduced to 32 DEG C, most vapor in the smoke becomes condensed water, and harmful substances such as CO2, NOx, SO2 and dust in the smoke are dissolved in the condensed water which is timely drained by a drainage system, thus greatly reducing the emission of pollutants, solving the problem of white smoke of the boiler in the prior art, achieving obvious energy-saving consumption reduction, emission reduction and atmosphere protection, and effectively weakening the urban heat island effect.

Description

technical field [0001] The invention relates to a condensing gas flue gas waste heat recovery device, which is an energy-saving and environmentally friendly product related to boilers, and is suitable for reducing the exhaust gas temperature of gas boilers, recovering flue gas waste heat, improving boiler efficiency, and reducing CO in flue gas. 2 , NOx, SO 2 , smoke and dust and other harmful substances to the atmosphere, and eliminate the gas flue gas condensation equipment that emits white smoke from the boiler. Background technique [0002] The exhaust gas temperature of gas-fired boilers is generally 120-250°C. The flue gas contains 8%-15% sensible heat and 11% latent heat of water vapor. If it cannot be recycled, it will lead to low efficiency of the boiler and a large resource waste. waste, while the flue gas contains CO 2 , NOx, SO 2 Hazardous substances such as smoke and dust, if discharged into the atmosphere, will have a bad impact on the environment. [0003]...

AI Technical Summary

Problems solved by technology

[0002] The exhaust gas temperature of gas-fired boilers is generally 120-250°C. The flue gas contains 8%-15% sensible heat and 11% latent heat of water vapor. If it cannot be recycled, it will lead to low efficiency of the boiler and a large resource waste. waste, while the flue gas contains CO 2 , NOx, SO 2 Hazardous substances such as smoke and dust, if discharged into the atmosphere, will have a bad impact on the environment

[0003] Before the present invention was made, heat pump technology was used to solve this kind of problem, but the use of heat pump requires expensive equipment investment, consumes a lot of electric energy, and the amount of flue gas treatment is limited, so it is difficult to popularize and apply

The flue gas condenser is a mature equipment for reducing the exhaust gas temperature. The current flue gas condenser is not very effective in exchanging heat with low-temperature flue gas with low thermal quality, and is restricted by the flue gas dew point corrosion. When the exhaust gas temperature drops above the flue gas dew point temperature (about 57°C), there is still a large amount of heat loss, and the problem of pollutant emission cannot be effectively solved.

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