Device and method for deep waste heat recovery and collaborative removal of pollutants in flue gas

Abstract

The invention relates to a device and method for recycling deep waste heat combined with removing pollutants, including SO<2>, smoke dust, PM2.5, SO<3> and Hg in flue gas. By means of the device and method, the SO<2>, smoke dust, PM2.5, SO<3> and Hg in the flue gas are comprehensively reduced, meanwhile, through a primary waste heat recycling system and a deep waste heat recycling system, waste heat of a boiler is recycled totally, the thermal efficiency of the boiler is raised, the coal consumption of the boiler is reduced, thereby the environmental protection goal is achieved, meanwhile, the energy conservation effect is achieved, and the purposes of saving energy and reducing consumption are achieved in real sense; through a deep waste heat recycling and smoke dust, PM2.5, SO<3> and Hg removing device at the tail of the coal-burning boiler, the pollutants (SO<2>, SO<3>, Hg, PM2.5) are disposed, SO<2> emission in the fuel gas is reduced by 98-99%, smoke dust emission in the fuel gas is reduced by 99.9-99.99%, Hg emission in the fuel gas is reduced by 50-80%, PM2.5 emission in the fuel gas is reduced by 50-70%, and meanwhile coal consumption can be reduced by 3-6 g / kWh.

Description

technical field [0001] The invention belongs to the field of thermal power generation, and specifically relates to a deep waste heat recovery and collaborative removal of pollutants in flue gas such as SO 2 , soot, PM2.5, SO 3 and Hg devices and methods. Background technique [0002] According to GB13223-2011 "Standards for Emission of Air Pollutants from Thermal Power Plants", the existing thermal power boilers have comprehensively increased the emission limit requirements of sulfur dioxide, nitrogen oxides, and smoke; for smog control, coal-fired power plants in key areas are also proposed At the same time, the new emission standard also proposes 0.03mg / m of mercury and compounds for existing thermal power boilers. 3 emission standards. In addition, the National Development and Reform Commission, the Ministry of Environmental Protection, and the National Energy Administration have issued the "Coal Power Energy Conservation and Emission Reduction Upgrading and Transforma...

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Problems solved by technology

[0006] The purpose of this patent is to overcome the deficiency that the existing environmental protection transformation technology cannot achieve energy saving and emission reduction at the same time, and provides a deep waste heat recovery and collaborative removal of pollutants in the flue gas, including SO 2 , soot, PM2.5, SO 3 and Hg devices, while controlling the emission of soot and PM2.5, further increase the SO 2 and mercury removal rate, to achieve PM2.5, SO 3 and mercury removal, while further reducing coal consumption

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