Method for synergistically realizing efficient removal of PM2.5/SO3 in high-moisture flue gas and zero water consumption in wet desulphurization

Abstract

The invention provides a method for synergistically realizing efficient removal of PM2.5 / SO3 in high-moisture flue gas and zero water consumption in wet desulphurization. The method comprises the following steps: making the high-moisture flue gas pass through a low-temperature heat exchanger before entering an electric precipitator, so that the smoke temperature drops below an acid dew point, gaseous SO3 in the flue gas is condensed and adsorbed onto the surface of fine particulate matters, the PM2.5 removal of the electric precipitator is enhanced, and synergistic removal of SO3 is realized; after the flue gas leaves the electric precipitator, further cooling through a low-low-temperature heat exchanger to obtain high-relative-humidity flue gas, then reaching oversaturation in a desulfurization tower within a low-temperature desulfurization fluid contact process, and nucleating and condensing the oversaturated water vapor on the acid mist surface of the PM2.5 and the SO3, so that the particle size increases, and the removal of the acid mist of the PM2.5 and the SO3 in the desulfurization process is facilitated. At the same time, an oversaturated water vapor environment is established in the tower, so that a part of moisture is condensed from the flue gas to the desulfurization fluid, and zero water consumption in the wet desulphurization is realized synergistically. The method has the characteristics of high efficiency, energy saving, low investment and treatment cost, and the like.

Description

[0001] 1. Technical field [0002] The present invention designs a synergistic realization of PM in high-moisture flue gas 2.5 / SO 3 The invention relates to a method for efficient removal and wet desulfurization with zero water consumption, which belongs to the technical field of dust removal. [0003] 2. Background technology [0004] PM 2.5 It is one of the important factors leading to major environmental problems such as reduced atmospheric visibility, acid rain and haze weather. Controlling PM 2.5 Emissions are a key issue that urgently needs to be addressed. At present, more than 80% of the large and medium-sized coal-fired power plants in my country adopt the dust removal and desulfurization technology of electrostatic precipitator + wet flue gas desulfurization system. In recent years, people have done a lot of research and improvement on the electrostatic precipitator from the aspects of pole distance, pole matching method, dust cleaning method, air flow distributi...

AI Technical Summary

Problems solved by technology

At present, the reduction of water consumption in the flue gas wet desulfurization system is mainly based on the treatment and reuse of discharged wastewater. There are problems such as complex equipment and high operating costs. How to reduce the gaseous water taken away by the desulfurized clean flue gas has not yet attracted attention.

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