Preparation of integrated desulfurizing agent during the two-stage digestible and separating process and its system thereof

Abstract

A process for preparing desulfurizing agent includes such steps as stage-one digestion of calcium lime in spiral stirrer, stage-two digestion by saturated high-temp steam in the digestive tower, separating large-granularity impurity particles in conic-ring flow region, separating coarse particles by a coarse particle separator, and separating fine particles from dead gas. Its system is composed of digestive tower, coarse particle separator, internal conic separating and circulating unit, material circulating cabin, fine particle separator, spiral stirrer and fluidizing blower.

Description

technical field [0001] The invention relates to a preparation technology of slaked lime desulfurization agent in a flue gas desulfurization system of a coal-fired power station, in particular to a desulfurization agent preparation process integrated with two-stage digestion and separation processes and a system thereof. Background technique [0002] my country is one of the few countries in the world that use coal as the main energy source. Coal has always accounted for more than 70% of the primary energy production and consumption in my country. It is imperative to control the emission of sulfur dioxide pollution. [0003] Circulating fluidized bed flue gas desulfurization technology is a semi-dry flue gas desulfurization method developed in the 1980s. Since this method has the characteristics of less investment, small footprint, simple system, and high desulfurization efficiency, it has become the focus of research, development and promotion in the power environmental prot...

AI Technical Summary

Problems solved by technology

Since most of these methods and devices adopt the fluidization air input with a small diameter at the bottom, large particles of impurities are easy to block here during the lime digestion process, hindering the normal operation of the entire digestion system, so the disadvantage is that the quality of quicklime is very strict. High, it is generally required that the average particle size of quicklime is less than 1mm, and the content of quicklime is more than 85%; moreover, large particles of impurities and water are mixed into a viscous slurry, which is easy to cause scaling on the inner wall of the lime digestion reactor. Particulate impurities are more likely to be blocked, forming a vicious circle, which will eventually lead to the ineffective operation of the digestive system; at the same time, lime raw material particles whose particle size does not meet the requirements require one or more external separators for separation and treatment, and then sent back to the digestion reaction tower Circulation, making the footprint of the entire digestive equipment too large

In the Chinese utility model patent specification with the notification number CN2577942Y, the slurry made of lime is sprayed into the desulfurization reaction tower to react with the sulfur dioxide in the flue gas, but this method makes the whole process and equipment more complex and occupies too much area , the slurry pipeline is easy to corrode, scale and block, and the slurry nozzle is easy to wear

The quicklime digester introduced in the Chinese utility model patent specifications with the announcement numbers CN2542658Y and CN2518861Y uses mechanical agitation and water spraying to digest quicklime. Although this type of device can digest quicklime continuously, the quicklime in the raw material Mixed with impurities such as gravel, sand, clay, etc., it is impossible to obtain high-quality slaked lime desulfurizer with large surface area and small particle diameter, and there is no effective way to remove large particles of impurities such as sand, gravel, clay, etc., and its digestion reaction is not efficient

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