Dry flue gas desulfurizing process with independent feeding, back-returning and water-spraying devices

Abstract

The present invention provides a dry flue gas desulfurizing process with independent feeding, feeding back and water-spraying device. It includes desulfurizing agent preparation digestion system, desulfurizing reaction tower and desulfurizing reaction system and exterior desulfurizing granules separation and recirculating system. The water-spraying atomization device of desulfurizing reaction tower, desulfurizing agent feeding device and granules recirculating feed back device are independently placed, and the different heights of the desulfurizing reaction tower are equipped with respective nozzles, so that the structure can raise the utilization rate of the desulfurizing agent and can raise the desulfurizing effect.

Description

technical field [0001] The invention relates to a dry flue gas desulfurization process with independent feeding, feeding and water spraying, which belongs to the technical field of flue gas desulfurization, and in particular relates to a dry desulfurization system and process in flue gas discharged from various combustion equipment. Background technique [0002] The control of sulfur dioxide gas pollution has always been the focus of environmental protection in most countries in the world, and the pollutants produced by it are the largest source of pollution that has caused damage to the ecological environment in my country. At present, it has become the top priority of air pollution control in my country. [0003] At present, the treatment of sulfur dioxide generally adopts the wet lime-gypsum method (W-FGD) in foreign countries. Although the above-mentioned method has a good removal effect, it has huge investment, large water consumption, large floor area, complex system, ...

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Problems solved by technology

[0006] However, the above-mentioned dry (semi-dry) desulfurization technology does not consider that when the unit is enlarged, due to the increase in the cross-section and height of the desulfurization reaction tower, the entire desulfurization reaction will fail due to the failure of the organization of the flue gas and particle flow field. to desulfurization technical requirements

[0007] From the above introduction, it can be seen that in the dry circulating fluidized flue gas desulfurization system, the mixing methods of feed material, return material and feed water mostly used at present are difficult to meet the high desulfurization efficiency under low calcium sulfur ratio, and the system The operation consumes a lot of water, especially when the capacity of the unit increases, this method is more difficult to meet the requirements of low consumption and high desulfurization rate

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