Wet-type ammonia process flue gas purifying technique for jointly removing multipollutant and system thereof

Abstract

A damp ammonia smoke and gas purifying techniques and system which deprives plurality kinds of infectant is provided. The technique uses the dual functions of high gradient magnetic field and grain conglobation accelerator firstly, which makes small grains in smoke and gas reunite large grains. Then deprives the reunited large grains by a static dedusting device, adopts oxydol to proceed oxidation on nitric oxide in the smoke and gas to convert to nitrogen dioxide, finally adsorbs sulfur dioxide and nitrogen dioxide in smoke and gas by damp ammonia smoke and gas purifying techniques. The system is composed of a high gradient magnetic field generator, a grains conglobation accelerator spaying device, a static dust catcher, an oxidant spaying device and a reaction adsorption tower which are laid in series one by one. A draining opening of the reaction adsorption tower can be connected with an outgrowth process system which is composed of a rotary stream separator, an evaporator and a desiccator. The invention can improve the utilization rate of absorbent effectively, deprives the respirable grains, oxysulfide and nitrogen oxides in smoke and gas, and has simple technics, simplified system and low investment and operating cost.

Description

technical field [0001] The invention relates to a flue gas purification treatment technology of a coal-fired power station, in particular to a wet-type ammonia flue gas purification process and system for jointly removing multiple pollutants. Background technique [0002] Coal is the main fuel for power stations in China at present and for a long time to come. While pulverized coal combustion provides the necessary heat and power resources, it will bring serious inhalable particulate matter (particulate matter with an aerodynamic diameter less than 10 μm, referred to as PM 10 ), sulfur dioxide SO 2 and nitrogen oxides NO x pollute. According to statistics: In 2005, my country's coal-fired power plants emitted inhalable particulate matter PM 10 The total amount accounts for 1.2-1.5% of the coal used for power generation, about 63,400-79,200 tons; in the same year, coal-fired power plants emitted sulfur dioxide SO 2 The total amount is as high as 25.49 million tons. Nitr...

AI Technical Summary

Problems solved by technology

Limestone-gypsum method and seawater desulfurization method have the defects of large area, complex system, high energy consumption and high operating cost

Although the circulating fluidized bed dry flue gas desulfurization method has a simple system, a small footprint, and low operating costs, it has high requirements on the quality of the desulfurizer, and the desulfurization by-product calcium sulfite is difficult to comprehensively utilize

Wet ammonia desulfurization technology has the advantages of small footprint, low investment and operating costs, and desulfurization by-products are valuable chemical raw materials and crop fertilizers, but its denitrification efficiency is very low

[0007] In order to solve the above problems, the Chinese utility model patent specifications with the announcement numbers CN2712446Y and CN2746971Y proposed a "Flue Gas Desulfurization and Denitrification Device" and "Desulfurization and Denitrification Integrated Flue Gas Purification Tower", but the desulfurization and denitrification equipment are all bulky. Large packing device, and directly use ammonia solution to absorb nitrogen oxide NO in flue gas x , not only greatly increases the resistance of the entire desulfurization and denitrification equipment, but also cannot effectively remove NO in the flue gas x

This is because NO x More than 90% of the components are nitric oxide NO, and NO is difficult to dissolve in water, and it is difficult to absorb NO by simple washing method

[0008] It can be seen that the use of more than two sets of independent desulfurization and denitrification systems is not only complicated in flue gas purification equipment, large in floor area, and high in construction and operation costs, but also the rational combination of these independent desulfurization, denitrification and dust removal systems to achieve comprehensive and efficient operation there are still many difficulties

Images