Method for preparing two-stage slaked lime in use for flue gas desulfurization system and equipment

Abstract

This invention relates to the process and device for preparing two-stage hydrated lime used in the flue gas desulphurization system, which belongs to the field of flue gas desulphurization. In the device of this invention, the bottom of the first-stage lime reaction column is connected with the raw material carbine through a Venturi sector. On the top of the raw material carbine is a quicklime inlet, and on the cone at the bottom of the raw material carbine is an air stream inlet. A water injector is fixed in the first-stage lime reaction column, whose upper outlet is connected with the inlet of the second-stage lime-slaking column. An air nozzle is fixed in the second-stage lime-slaking column, whose lower outlet is connected with the inlet of the lower discharge cyclone separator. Discharging pipes are fixed on the oblique plane on the top of the lower discharge cyclone separator, and a dual channel is fixed at the bottom of the oblique plane. One end of the dual channel is connected with an air oblique slot whose top end is connected with the bottom of the first-stage lime reaction column, and a feeding pipe that is connected with the bottom of the second-stage lime-slaking column. The other end of the dual channel is connected with a winch that conveys the products. The process of this invention is easy to operate and the design of the device is rational.

Description

technical field [0001] The invention belongs to the technical field of flue gas desulfurization, in particular to a two-stage slaked lime preparation method and device for a flue gas desulfurization system. Background technique [0002] Sulfur dioxide is one of the main pollutants that cause environmental pollution such as greenhouse effect and acid rain. Coal has always accounted for more than 70% of my country's energy structure for a long time. In the foreseeable future, my country's energy structure with coal as the main energy source will not be fundamentally changed. A large amount of coal burning will produce a large amount of pollutants such as sulfur dioxide. At present, my country's annual emission of sulfur dioxide ranks first in the world, seriously affecting the sustainable development of my country's national economy. [0003] Flue gas desulfurization in the prior art can be divided into two categories: wet method and dry method (semi-dry method). Although th...

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Problems solved by technology

These slaked lime powders are not only expensive, but also have large particle sizes and poor surface activity. The utilization rate of the desulfurizer particles reacted in the desulfurization tower is very low, and the desulfurization rate is not high at the same time, which increases the operating cost of the desulfurization system.

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