A new method for desulfurization, denitrification, decarbonization and dust removal of coal-fired flue gas combined with dry and wet methods

Abstract

Belonging to the field of environmental protection, the invention particularly relates to technologies for smoke prevention and dust control as well as flue gas purification of industrial waste gas and coal-fired flue gas. The invention discloses a dry process-wet process combined new method for desulfurization, denitration, decarbonization and dedusting purification of coal-fired flue gas. A flue gas purification system composed of a fire coal burner, a dry particle separator, an active micro-alkali soil feeder, a mixing draught fan, a pH value adjustment groove, a spraying circulating device and a flue gas purifier forms a complete dry process-wet process combined new technological scheme for desulfurization, denitration, decarbonization and dedusting purification of coal-fired flue gas. The method provided by the invention makes full use of the dry-process cyclone separation dedusting principle, wet-process flue gas spray purification, impact purification and water membrane purification principles, reduces the resistance and operating cost, and at the same time increases the dedusting efficiency of coal-fired flue gas, and also has good purifying effects on SO2, NOx, CO2 and other gaseous pollutants in flue gas, thus fully meeting the national flue gas first-class emission standards or stricter emission standards.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to the smoke and dust removal and flue gas purification technology of industrial waste gas and coal-fired flue gas. Background technique [0002] The pollution caused by the discharge of industrial waste gas and coal-burning flue gas has reached the point of destroying the ecological environment and affecting human health. Protecting the environment and controlling air pollution have become our national policies, which have been valued by the country and governments at all levels. Therefore, in the country With the support of governments at all levels, various smoke and dust removal and flue gas purification technologies have also developed. However, the previous dry dust removal or wet flue gas purification products generally have excessive resistance, high operating costs, and fan belts. The troubles caused by serious water and wet corrosion and different degree...

AI Technical Summary

Problems solved by technology

[0002] The pollution caused by the discharge of industrial waste gas and coal-burning flue gas has reached the point of destroying the ecological environment and affecting human health. Protecting the environment and controlling air pollution have become our national policies, which have been valued by the country and governments at all levels. Therefore, in the country With the support of governments at all levels, various smoke and dust removal and flue gas purification technologies have also developed. However, the previous dry dust removal or wet flue gas purification products generally have excessive resistance, high operating costs, and fan belts. The troubles caused by serious water and wet corrosion and different degrees of blockage of equipment have caused the effect of dust removal and flue gas purification to plummet, causing problems such as sick work and increased consumption of industrial and civil equipment, as well as the previous dry dust removal Or wet flue gas purification products all focus on dust removal, often ignoring the purification and treatment of gaseous pollutants such as sulfur, nitrate, and carbon dioxide in the flue gas. Even if the purification and treatment of sulfur-containing flue gas is considered, dust removal belongs to dust removal , purifying belongs to purifying, but ignores that the flue dust contains a large amount of positive ions, and the slag water after soaking and burning also contains a large amount of free to purify negative ions such as SO2 in the flue gas. The invention discloses a dry, wet The new method of coal-fired flue gas desulfurization, denitrification, decarbonization and dust removal and purification combined with the new method not only has low resistance, low operating cost, but also has a good purification effect on smoke and dust, and has a good effect on gaseous pollutants such as SO2, NOx, and CO2 in the flue gas. Also has a good purification effect

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