Process for dust removal and desulfurization through clear water and comprehensive recycling of gas-solid pollutants in flue gas

Abstract

The invention relates to a process for dedusting and desulfurizing by clear water and comprehensively recycling gas-solid pollutants in flue gas, which comprises the following steps: atomizing the clear water in sections and layers in an absorption and conversion device to be in convection contact with the flue gas, absorbing and converting sulfur dioxide in the flue gas into dilute sulphuric acid by water mist, and dissolving smoke dust at the same time; aluminum oxide, ferric oxide and calcium oxide in the smoke are converted into aluminum sulfate, ferric sulfate and calcium sulfate, silicon dioxide of various specifications is sorted through a specific gravity difference separation method, the aluminum sulfate and the ferric sulfate are further changed into polyaluminum sulfate and polyferric sulfate through a polymerization reaction, and the calcium sulfate is dissolved in the polyaluminum sulfate and the polyferric sulfate. Through the steps, an original desulfurization device is utilized, an original operation process is adopted, clear water is used as a desulfurization and dust removal medium, and integrated treatment and resource utilization of gaseous pollutants and solid pollutants are realized while high-efficiency removal of sulfur dioxide and smoke dust in the flue gas is completed, so that coal-fired flue gas treatment becomes a profit creation industry.

Description

technical field [0001] The invention relates to the field of flue gas purification, in particular to the technology of flue gas purification of coal-fired boilers and comprehensive recycling and utilization of flue gas pollutants. Background technique [0002] During the operation of coal-fired boilers, a large amount of pollutants are generated while utilizing the heat generated by coal, including soot, sulfur dioxide, and nitrogen oxides. remove. The dust removal in the conventional method is dominated by bag dust removal and electrostatic precipitator. The dust particles are collected by cloth bags or high-voltage static electricity, and then landfilled or added to building materials for treatment; the desulfurization in the conventional method is dominated by the limestone-gypsum method. , In the three-dimensional desulfurization tower, through the convective contact reaction between the lime slurry and the flue gas, the lime slurry absorbs the sulfur dioxide in the flu...

AI Technical Summary

Problems solved by technology

[0005] The disadvantages of the above methods are: 1. The collected soot becomes fly ash, which has little utility value, and most of them are landfilled, which not only occupies a large area of ​​land, but also forms a secondary pollution source

2. The desulfurizer consumes a large amount of limestone resources, and releases nearly the same amount of carbon dioxide during the desulfurization process, turning resources into secondary pollutants while releasing a huge amount of greenhouse gases, which intensifies global warming