Cyclic fluidizing dry flue desurlfurizing and duct collecting process by electric bag dust collector

Abstract

A circulating fluidized dry technology using electric bag cleaner for desulfurizing and dusting fume features that the great-diameter dust in the fume discharged from desulfurizing reaction tower is collected by the electrostatic dusting area of electric bag cleaner and then returned back to said desulfurizing reaction tower and the small-diameter dust is collected by the bag dusting area of electric bag cleaner and then returned back to the desulfurizing reaction tower for the most of it or exhausted for its rest. Said electrostatic and bag dusting areas are isolated by the metallic lattice. Its advantage is high desulfurizing effect under low Ca / S ratio.

Description

technical field [0001] The invention relates to a circulating fluidized dry flue gas desulfurization and dust removal process using an electric cloth bag filter, which belongs to the technical field of flue gas desulfurization and dust removal, and particularly relates to a dry flue gas desulfurization system and process for flue gas exhausted by 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 it produces are also the largest source of pollution that causes damage to my country's ecological environment, and it has become the top priority of my country's current air pollution control. At present, the limestone-gypsum method is generally used in the early stage of sulfur dioxide treatment, which belongs to the wet desulfurization method. This method is relatively mature and stable, and the desu...

AI Technical Summary

Problems solved by technology

With the current increasing requirements for dust removal in power plants, it is difficult for a single dust removal method to meet the dust emission standards formulated by the country, because it has the following defects: First, due to the use of a single dust collector, the particle size of the recirculated particles varies within the range Larger, resulting in the collision between solid particles in the desulfurization tower and insufficient contact between solid particles and flue gas, and the mixing of flue gas and desulfurizer particles is weakened, which in turn affects the utilization rate and desulfurization efficiency of desulfurizer

Secondly, it is difficult to separate ultra-fine dust with a single dust collector. Since ultra-fine dust is usually composed of desulfurization reaction products that have completed the desulfurization reaction, if such ultra-fine dust is sent back to the desulfurization tower, it will lead to invalid particles in the tower. The concentration rises sharply, thereby destroying the reaction process of fresh desulfurizer particles and affecting the desulfurization reaction efficiency in the tower. Third, due to the above reasons, the ratio of ultrafine dust in the outlet flue gas will become higher and higher. According to the current best The performance parameters of the electrostatic precipitator will also cause the dust concentration of the flue gas discharged into the atmosphere after dust removal to reach 150mg / Nm 3 Above, this has been fully reflected in the flue gas desulfurization operation practice of some power plants at home and abroad

In addition, when the dry flue gas desulfurization unit is large-scaled, the amount of recycled materials will increase a lot, and the use of a single dust removal method will greatly increase the burden on the dust removal system, thereby affecting the dust removal effect of the dust removal system, and will also make it difficult for the dust emission to meet the standard

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