Boiler flue gas pollution discharge and waste heat recovery heat pump heating system and application method thereof

Abstract

The invention discloses a boiler flue gas pollution discharge and waste heat recovery heat pump heating system and an application method thereof. The boiler flue gas pollution discharge and waste heat recovery heat pump heating system is characterized in that a boiler is a gas-fired boiler, and the boiler flue gas pollution discharge and waste heat recovery heat pump heating system comprises a main flue, a chimney, a flue gas waste heat recovery device, a hot water box and a high-temperature heat pump unit, wherein one end of the main flue is connected with the gas-fired boiler, the other end of the main flue is connected with the chimney, the main flue is also provided with a bypass flue, the main flue is communicated with the flue gas waste heat recovery device through the bypass flue, and the main flue and the bypass flue are both provided with changing-over valves. The boiler flue gas pollution discharge and waste heat recovery heat pump heating system disclosed by the invention has the advantages that the structure is simple and reasonable, the flue gas waste heat recovery ratio is high, and the overhaul and maintenance are convenient through changing over the valves; due to the condensation action, the hazardous substance discharged to the atmosphere is also greatly reduced, the waste heat is recycled, the flue gas temperature is reduced, and a greenhouse effect is reduced, meanwhile, the hazardous gas discharged by the gas-fired boiler to the atmosphere is reduced, and the environment is protected.

Description

[0001] technical field [0002] The invention belongs to the field of energy technology, and in particular relates to a flue gas waste heat recovery heat pump heating system for a gas boiler and a use method thereof. [0003] Background technique [0004] In order to reduce the pollution of boiler flue gas to urban air, many cities restrict coal-fired boilers and vigorously develop gas-fired boilers fueled by clean natural gas. The main component of natural gas is methane, which generates a large amount of water vapor after combustion, and the water content of the flue gas is about 20%. The heat loss of the exhaust gas includes not only a large amount of sensible heat loss, but also the latent heat loss of water vapor vaporization. The exhaust gas temperature at the tail of small and medium-sized gas-fired boilers is generally 170-210°C, and the potential for waste heat recovery is relatively large. However, gas-fired boilers are usually not equipped with heat exchange equi...

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Problems solved by technology

[0005] At present, most of the structural schemes of the few boilers equipped with waste heat recovery systems are to directly connect the gas-fired boiler flue gas waste heat recovery device between the boiler exhaust port and the chimney to recover the flue gas waste heat. The resistance to the flue gas discharged from the boiler is relatively large, which will have a certain impact on the combustion conditions inside the boiler; the boiler flue gas waste heat recovery device is directly installed between the boiler smoke exhaust port and the chimney, which is not convenient for the boiler flue gas waste heat recovery device Maintenance and cleaning, when the waste heat recovery device is maintained and cleaned, the gas-fired boiler needs to be shut down; when the boiler is regularly discharged, the heat in the sewage is wasted and not recycled, resulting in energy waste

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