A boiler flue gas waste heat recovery device

Abstract

The invention relates to a boiler flue gas waste heat recovery device. The device comprises a direct spraying type flue gas heat recovery unit communicated with a flue gas outlet of a boiler, and a rotary solid moisture absorption agent heat recovery unit; the flue gas flowing out of the direct spraying type flue gas heat recovery unit is firstly subjected to heat and mass transfer with the solid moisture absorption agent heat recovery unit, and heat and moisture of the flue gas are absorbed by the solid moisture absorption agent heat recovery unit to become exhaust smoke; then the solid moisture absorption agent heat recovery unit is rotated to be subjected to heat and mass transfer with outdoor air, and the outdoor air is heated and humidified by the solid moisture absorption agent heat recovery unit to form boiler inflow air and is sent to the boiler. The direct spraying type flue gas heat recovery unit is used for directly making contact with flue gas for heat recovery, and the solid moisture absorption agent heat recovery unit is used for carrying out heat and mass transfer with the flue gas and the outdoor air, so that the latent heat of water vapor in the flue gas is effectively recycled; the recycled heat is used for preheating returned water of a heat supply network, so that the gradient recycling of the heat of the flue gas is achieved, and the energy utilization efficiency of a heat supply system of the boiler is effectively improved.

Description

technical field [0001] The invention relates to a waste heat recovery device, in particular to a boiler flue gas waste heat recovery device, which belongs to the field of HVAC systems. Background technique [0002] Heating energy consumption in northern cities and towns is an important component of my country's building energy consumption, accounting for about 40% of the current total building energy consumption. How to effectively reduce heating energy consumption in northern cities and towns is an important issue facing the development of ecological civilization construction and building energy conservation. problem. With the promotion of natural gas clean heating, natural gas boiler heating and gas-driven combined heat and power heating have been more and more used in northern my country, becoming an important form of heat source for central heating systems in northern cities and towns. Judging from the chemical composition of natural gas, the flue gas formed after combus...

AI Technical Summary

Problems solved by technology

However, the current flue gas waste heat recovery system usually has a high degree of complexity in the process of recovering flue gas sensible heat and latent heat at the same time. How to further build a simple and compact flue gas waste heat recovery system to realize efficient recovery and utilization of flue gas heat , which is an important problem to be solved to improve the utilization efficiency of natural gas in the actual heating system

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