A deep recovery device for boiler flue gas waste heat

Abstract

The invention relates to a deep recovery device for boiler flue gas waste heat, comprising a boiler, a steam-water heat exchanger, a flue gas-water heat exchanger, an air-water heat exchanger and an air reheater; the flue gas outlet of the boiler is connected to the steam-water heat exchange The flue gas inlet of the steam-water heat exchanger is connected to the flue gas inlet of the flue gas-water heat exchanger, and the air outlet of the air-water heat exchanger is connected to the air inlet of the air reheater. The air outlet is connected to the air inlet of the boiler; one water outlet of the steam-water heat exchanger is used for outward overflow, the other water outlet is connected to the water inlet of the boiler, and the water outlet of the boiler is connected to the return water inlet of the steam-water heat exchanger through the heat network; One water outlet of the air-water heat exchanger is used for outward overflow, the other water outlet is connected to the water inlet of the air-water heat exchanger, and the water outlet of the air-water heat exchanger is connected to the inlet of the flue gas-water heat exchanger. water outlet. The invention can increase the dew point temperature of the flue gas, recover more waste heat of the flue gas, lower the combustion temperature and reduce the NOx emission at the same time.

Description

technical field [0001] The invention relates to an energy recovery device, in particular to a deep recovery device for boiler flue gas waste heat recovery and reduction of nitrogen oxide emissions, belonging to the technical field of energy. Background technique [0002] Natural gas, oil, biomass and other fuels contain a large amount of hydrogen, and boiler combustion produces a large amount of water vapor, such as 1m 3 The combustion of natural gas will generate 1.55kg of water vapor, and the latent heat is about 3600kJ, accounting for 10% of the low-level calorific value of natural gas, but this part of the heat is often directly discharged into the atmosphere with the flue gas, causing waste of flue gas waste heat. Therefore, if the temperature of the flue gas can be lowered below the dew point and the part of the latent heat can be recovered, it will play an important role in saving fuel consumption. On the other hand, the flue gas generated by the boiler combustion con...

AI Technical Summary

Problems solved by technology

[0006] In view of the above problems, the purpose of the present invention is to provide a boiler flue gas waste heat that can not only increase the equivalent heat capacity of the air by humidifying the combustion air, recover more flue gas waste heat, but also solve the problem of unstable combustion caused by air droplets. Deep Recovery Unit

Images