Spray absorbing and drying-dry powder activating large multiplying power circulating flue gas desulfurization process

Abstract

The invention relates to a spray absorbing and drying-dry powder activation magnification recycling flue gas desulfurization technique, which is characterized in that: after being evenly distributed by a flue gas-recycling dry powder distributor on the top of a spray absorbing and drying tower, flue gas containing sulfur dioxide enters the tower; grout of desulfurizing agent is conveyed to an atomizer on the top of the tower by a slurry pump, is atomized into fine fog drops to fully touch the flue gas and absorb sulfur dioxide in the flue gas, and is dried into solid powder which enters a desulfurizing agent powder storage tank; part of the dry powders in the desulfurizing agent powder storage tank are conveyed to an atomizing area at the top of the tower by a gas circulator, wet and activated by the fog drops atomized by the atomizer so as to continue to take part in the desulphurization; other part of the powders are directly discharged from the desulfurizing agent powder storage tank; cooling flue gas containing fine powder leaves the tower and enters a bag-type dust collector to separate the fine powder; the purified flue gas is conveyed to a chimney by an induced draft fan for discharging. The invention has the advantages of simple technique, small systemic resistance, high desulfurization efficiency, high utilization rate of desulfurizing agent, no emission of waste water, small investment in equipment, great operational flexibility, etc.

Description

technical field [0001] The invention belongs to the technical field of removing sulfur dioxide from industrial flue gas, and relates to a spray absorption drying-dry powder activation large-rate circulating flue gas desulfurization process. Background technique [0002] At present, many technologies for removing sulfur dioxide from flue gas have been developed, the typical ones are limestone-gypsum wet desulfurization technology, circulating fluidized bed desulfurization technology, spray absorption drying desulfurization technology, etc. The wet desulfurization technology based on the limestone-gypsum method is widely used in the boiler flue gas desulfurization devices of thermal power plants. Its main advantage is high desulfurization efficiency; but its disadvantages are also obvious. For the same processing capacity, other The device is huge, the amount of waste water produced is large and the equipment is severely corroded. The circulating fluidized bed method adopts d...

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Problems solved by technology

The wet desulfurization technology based on the limestone-gypsum method is widely used in the boiler flue gas desulfurization devices of thermal power plants. Its main advantage is high desulfurization efficiency; but its disadvantages are also obvious. For the same processing capacity, other The device is huge, the amount of wastewater generated is large and the equipment is severely corroded

The circulating fluidized bed method adopts dry powder desulfurization agent to be humidified and activated, and then recycled. , the desulfurization efficiency is low, the activation of the dry powder used in the system is not uniform enough, the system resistance is large, and the load of the dust recovery system is large

The desulfurization agent is made into a slurry by the spray absorption drying method, atomized by an atomizer and contacted with flue gas to absorb sulfur dioxide in the flue gas, and at the same time, dry it into a powder product. Under comparable conditions, the desulfurization efficiency of this method is lower than that of Wet method, but it is higher than circulating fluidized bed and other processes that use dry powder as desulfurizing agent. The equipment investment and equipment area are smaller than circulating fluidized bed, but the utilization rate of desulfurizing agent is low

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