Smoke denitration, desulphurization and dust removal process

Abstract

The invention relates to a smoke denitration, desulphurization and dust removal process, and relates to a method for treating smoke. The method comprises the following steps: introducing smoke from aburning apparatus into a coarse-particle desulphurization agent, pre-desulphurizing the smoke, and then enabling the smoke to enter a denitration reactor; enabling the denitrated smoke to enter an air / smoke heat exchanger for cooling; adjusting the humidity of the cooled smoke, and enabling the smoke to enter a dry-type desulphurization tower, wherein a dry powder desulphurization agent is utilized in the dry-type desulphurization tower; and enabling the desulphurized smoke comprising dust such as the reacted desulphurization agent to enter a bag dust collector to remove the dust, mixing hot air from the air / smoke heat exchanger and smoke in front of or behind the dust collector, and guiding the purified smoke mixed with the hot air into a chimney for discharging. By adopting a process disclosed by the invention, fine dust can be prevented from blocking a denitration catalyst pore, and the deactivation caused by the blocking of the denitration catalyst pore can be avoided; by adjustingthe humidity of the smoke, the dry powder desulphurization agent can be directly used in the dry-method desulphurization process; and by mixing the hot air and the smoke, the corrosion of the chimneyand the formation of discharged smoke white mist can be prevented.

Description

technical field [0001] The invention relates to a method for treating industrial flue gas, in particular to a flue gas denitrification, desulfurization, and dust removal process. Background technique [0002] The main pollutants in the flue gas produced by fossil fuel combustion are SO 2 , NOx and dust. In recent years, with the strict requirements of environmental protection standards, the pollution control of industrial furnace flue gas in all walks of life has become increasingly urgent. Due to different fuel sources and combustion conditions, industrial furnaces produce different flue gas components, such as tunnel kilns in the refractory industry, glass kilns, chemical industrial furnaces, and heating furnaces in the metallurgical industry. Low (such as <300 ℃), some contain very fine dust. If the traditional denitration process is adopted, the denitration efficiency is low, and it is easy to cause deactivation of the denitration catalyst. [0003] For most indust...

AI Technical Summary

Problems solved by technology

However, because the untreated flue gas cannot dissipate quickly, especially when the temperature and air pressure in the local area are low or during the period of cloudy weather, the dust and liquid droplets carried in the flue gas gather near the chimney and fall to the ground to form "gypsum rain". ” or acid rain, polluting the factory area and the surrounding environment, and even corroding equipment

At present, many power plants install gas-gas heat exchangers (GGH) to increase the exhaust gas temperature and eliminate white fog in the chimney, but the problems of GGH blockage, corrosion and air leakage are difficult to solve

Images