System and method for removing sulfur and mercury out of flue gas by adding organic catalyst to wet spraying absorption tower

Abstract

The invention discloses a system for removing sulfur and mercury out of flue gas by adding an organic catalyst to a wet spraying absorption tower. The system comprises flue gas absorption equipment, ammonia water storage and supply equipment, dust separation and catalyst recycling equipment, evaporative crystallization equipment and process water equipment, wherein the ammonia water storage and supply equipment and the dust separation and catalyst recycling equipment are respectively communicated with the flue gas absorption equipment; the dust separation and catalyst recycling equipment is connected with the evaporative crystallization equipment; and the evaporative crystallization equipment is connected with the process water equipment. The invention simultaneously discloses a method for removing sulfur and mercury by utilizing the system. The mixture of the organic catalyst and emulsion comes into countercurrent contact with flue gas in the wet spraying absorption tower and purify and absorb the flue gas and then desulfurization saline solution is sent to a three-phase separator and the evaporative crystallization equipment to produce ammonium sulfate, thus reaching the aims of multi-effect control of the flue gas, energy conservation, consumption reduction and cost reduction.

Description

technical field [0001] The invention relates to a system and method for flue gas desulfurization and mercury removal by adding an organic catalyst to a wet spray absorption tower. Background technique [0002] At present, air pollution is very serious. In order to protect the atmospheric environment, flue gas desulfurization technology has been widely used in recent years. There are mainly the following methods: 1. Limestone-gypsum wet method: powdered limestone is used as the desulfurizer, and the desulfurization efficiency is 90-95%. The removal components are single, the by-product gypsum is unstable and cannot be widely used, and there are wastewater pollution and pipeline blockage problems; 2. Fluidized bed (semi) dry method: calcium oxide or calcium hydroxide is used as the desulfurizer, and the desulfurization efficiency is 88% -92%, the removal of components is single, the by-product components are complex, unstable, secondary pollution, and there are problems such ...

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Problems solved by technology

Because ammonium bisulfite has poor stability and is not easy to oxidize, it is necessary to ensure sufficient forced oxidation intensity and oxidation time. At the same time, the oxidation process of ammonium sulfite causes the effective ammonia concentration in the tower to decrease, and the forward reaction speed of desulfurization is limited, which is not conducive to SO 2 removal of

The evaporation and crystallization system of ammonium sulfate adopts the existing evaporation heater and crystallizer technology, which has the problem of large steam consumption. At the same time, the system has large ammonia loss, large ammonia escape and aerosol phenomenon, and the removal rate of nitrogen oxides is not high. The denitrification rate is only 30-40%, and it does not have the function of mercury removal

The existing filtration technology cannot guarantee that ammonium sulfate does not contain sintering dust impurities, etc., which will affect the quality of ammonium sulfate

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