System and process for desulfuration and denitration by pure oxygen dielectric barrier discharge in flue

Abstract

The invention relates to a system and a process for desulfuration and denitration by pure oxygen dielectric barrier discharge in a flue, and belongs to the technical field of the desulfuration and denitration of flue gas in heat-engine plants. In the process, air is separated by an air separator, and separated oxygen enters a dielectric barrier discharge reactor; O2 molecules are activated, cracked or ionized in the reactor to form free radicals O or O3 and the like which have high oxidability; the oxidizing gas which is subjected to discharging is mixed with the flue gas quickly and fully through a spray device to be subjected to reaction, so that NO and SO2 in the flue gas are oxidized to form high-valence nitric oxides and high-valence sulfur oxides; and the oxidized flue gas enters an alkali liquor absorption tower, and is washed by alkali liquor to fulfill the aims of removing the nitric oxides and the sulfur oxides. In the process, due to pure oxygen discharging, the cost of producing the free radicals is low, the free radicals and the flue gas are mixed early, the removal efficiency of pollutants is high, the economic benefit is higher, and nitrates, nitrites, sulfates and the like are used as products to be recovered to realize the environment-friendly recycling of the pollutants.

Description

technical field [0001] The invention belongs to the technical field of flue gas desulfurization and denitrification in thermal power plants, and in particular relates to a pure oxygen dielectric barrier discharge desulfurization and denitrification system and process in a flue. Background technique [0002] SO in flue gas of thermal power plant 2 NOx and NOx are the main gas pollutants in the atmosphere, which not only bring various hazards to the human body, but also have a great impact on the growth of animals and plants, as well as on the weather and climate, so measures must be taken to control them. An excellent flue gas purification technology not only needs to meet the high-efficiency removal rate, but also considers the technical economy and the simple operability of the system. At present, many researchers agree that SO 2 and NOx integrated removal. [0003] At present, thermal power plants generally use two sets of devices to desulfurize and denitrify the flue ga...

AI Technical Summary

Problems solved by technology

[0012] (1) The system is complex and requires a large amount of operation and maintenance;

[0013] (2) The initial investment cost is high, and the equipment cost is high;

[0014] (3) Due to the high sulfur content in coal combustion in my country, it is easy to cause catalyst poisoning in the SCR system and dust accumulation and blockage of the air preheater;

[0015] (4) It is not conducive to the transformation of old power plants

[0016] Although the removal efficiency of the ozone desulfurization and denitrification process is high, because the ozone generator is set outside the flue, after the ozone is generated, it takes a certain distance to enter the flue and mix with the flue gas, and the strong oxidizing ozone is mixed with the flue gas. Before the mixed reaction, it will partially react with other substances, and the ozone itself will also partially decompose, resulting in unnecessary consumption of ozone, corrosion of equipment and pipelines, and high operating costs

Images