Desulfurization and denitrification method for streamer discharge plasma free radical injected flue gas

Abstract

The invention discloses a desulfurization and denitrification method for streamer discharge plasma free radical injected flue gas. The method comprises the following steps of: 1) discharging oxygen or air to produce plasma free radicals by using a streamer discharge plasma reactor; 2) injecting the gas containing the plasma free radicals into a flue, and mixing the gas and flue gas containing sulfur oxides and nitrogen oxides, wherein the sulfur oxides and the nitrogen oxides in the flue gas are converted into high-valent oxides by the plasma free radicals; 3) delivering the flue gas in the last step to a desulfurization tower for circular spraying absorption, so that the sulfur oxides and the nitrogen oxides enter a liquid phase; and 4) demisting the flue gas subjected to the circular spraying absorption, and discharging through a chimney. The method has synchronous desulfurization and denitrification capability; a catalyst and a special reaction temperature requirement are not required in the denitrification process; desulfurization and denitrification are integrated, so that the investment is low, and a small space is occupied; and the system is low in resistance and low in energy consumption.

Description

technical field [0001] The invention relates to a desulfurization and denitrification method for injecting streamer discharge plasma radicals into flue gas. Background technique [0002] Coal accounts for more than 75% of my country's total primary energy consumption. During the combustion of coal, a large amount of sulfur dioxide and nitrogen oxides are produced, forming acid rain and photochemical smog, which cause air pollution. According to the Bulletin of the First National Survey of Pollution Sources published by the Ministry of Environmental Protection on February 6, 2010, the emissions of sulfur dioxide and nitrogen oxides in 2007 were 23.2 million tons and 17.977 million tons. It is estimated that by 2020, my country's energy demand may reach 3 billion to 3.4 billion tons of standard coal, and the sulfur dioxide, soot, and nitrogen oxides emitted by thermal power plants will reach 21 million tons, 5 million tons, and 12 million tons. Emissions cause direct economic ...

AI Technical Summary

Problems solved by technology

SCR technology has problems such as expensive catalysts and easy poisoning, high operating costs; formation of sulfuric acid such as ammonium sulfate to block equipment; secondary pollution caused by ammonia leakage

The temperature required for the SNCR reaction is above 900°C and does not require a catalyst, but the consumption of the reducing agent is large, the denitrification efficiency is not high, and there is also ammonia leakage and the generation of N 2 O, CO and other secondary pollution problems

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