Gas-fired boiler flue gas waste heat utilization and white mist removal system and method

Abstract

The invention discloses a gas boiler smoke waste heat utilization and white mist removal system and a method. The system comprises a gas boiler and a combustor, a smoke outlet of the gas boiler is connected with a main smoke flue and a branch smoke flue, the main smoke flue is connected with a waste heat depth utilization device, an air / smoke mixing, condensing and dehumidifying device and a heating and humidity reduction device, the waste heat depth utilization device and air / smoke mixing, condensing and dehumidifying device are connected with a condensed water recycling device, and the branch smoke flue is connected with an air / smoke mixing and preheating device. The method comprises the following steps that a first valve is opened, a second valve is closed, a U-shaped heat exchange headis controlled to move towards the interior of the heating and humidity reduction device, after heat exchange is carried out, the U-shaped heat exchange head is moved out, the second valve is opened,the cooled smoke enters the air / smoke mixing and preheating device, and all the above steps are repeated. The invention aims to provide the gas boiler smoke waste heat utilization and white mist removal system and the method, and the purposes of saving gas, reducing emission and recovering water resources can be achieved.

Description

technical field [0001] The invention relates to the field of natural gas boiler energy saving and emission reduction technology and flue gas clean emission, in particular to a gas boiler flue gas waste heat utilization and white mist removal system and method that can simultaneously realize energy saving, low nitrogen emission reduction, and water resource recovery and utilization . Background technique [0002] With the in-depth advancement of my country's industrialization and urbanization, energy consumption continues to increase, the situation of reducing air pollution is severe, and atmospheric environmental problems are becoming increasingly prominent. Beijing took the lead in completing the coal-to-gas conversion of the heat source of the heating system, realizing the coal-free urban area of ​​Beijing, controlling the content of soot and sulfur in the air, and greatly improving the air quality. Subsequently, Tianjin, Hebei, Shanxi, Xinjiang and other major heating ar...

AI Technical Summary

Problems solved by technology

[0007] Through the analysis of gas composition, it can be known that 1m³ of natural gas can produce about 1.55kg of water vapor after combustion, that is to say, the amount of water vapor discharged by each ton of boilers is about 2.6 tons per day, resulting in a great waste of water resources

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