Wet desulfurization synergized fine particle and SO3 acid mist removing method and device

Abstract

The invention discloses a wet desulfurization synergized fine particle and SO3 acid mist removing method and device. The device comprises a flue gas cooling and humidifying device, a wet desulfurization tower, a desulfurization washing solution heat exchanger and a cold water spray layer at the top of the desulfurization tower. The method comprises the following steps: spraying atomized water to the inlet flue duct of the desulfurization tower for cooling and humidifying; performing heat exchange and cooling on the desulfurization washing solution; carrying out once trapping with the desulfurization washing solution when high-humidity flue gas in the desulfurization tower is over saturated in the desulfurization washing process and fine particles and SO3 acid mist are coagulated and grow up; setting a cold water spray layer between the desulfurizing liquid spray layer at the top of the tower and a high-efficient demister, and spraying and cooling with cold water to enable the flue gas to be over saturated once again, coagulating and growing the fine particles and SO3 acid mist once again, and trapping with the high-efficient demister. The method can be used for effectively reinforcing the trapping effect of a wet desulfurization system on fine particles and SO3 acid mist, the desulfurization water consumption can be reduced, and the desulfurization efficiency can be improved. The method and device are suitable for coal-fired boiler with a wet flue gas desulfurization system.

Description

[0001] 1. Technical Field [0002] The invention belongs to fine particles of coal-fired flue gas and SO 3 The technical field of acid mist emission control, in particular to an application of water vapor phase change technology to improve the wet flue gas desulfurization system for fine particulate matter and SO 3 Method and device for removing acid mist. [0003] 2. Background technology [0004] Fine particulate matter and SO 3 Acid fog pollution has become a prominent atmospheric environmental problem in my country, and it is an important factor leading to major environmental problems such as reduced atmospheric visibility, acid rain, haze weather, and global climate change. At present, more than 80% of large and medium-sized coal-fired power stations in my country adopt wet desulfurization technology. Due to the scrubbing effect of the desulfurization scrubber, the wet flue gas desulfurization system can synergistically remove some of the larger fine particles and SO in the flue...

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Problems solved by technology

The invention patent with application number 200710132250.0 discloses a method of using water vapor phase change to promote PM in wet flue gas desulfurization 2.5 The removal method adopts two methods of adding steam to the tower inlet flue gas and desulfurization and purification flue gas to make the flue gas supersaturated in the desulfurization washing process and desulfurization and purification flue gas respectively; but only by adding steam to achieve supersaturation The establishment of water vapor environment, the energy consumption is too high

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