Streamer corona plasma flue gas denitrification method

Abstract

The invention discloses a streamer corona plasma flue gas denitrification method which comprises the following steps of: 1, sending boiler flue gas containing nitric oxide to a streamer corona oxidation reactor after being subjected to dust removal, and under an environment of streamer corona discharge, oxidizing low valent nitric oxide into high valent nitric oxide; 2, enabling the boiler flue gas after passing through the streamer corona oxidization reactor to enter an absorption tower for circularly spraying and absorbing, and enabling the high valent nitric oxide in the flue gas to enter a liquid phase; and 3, discharging the flue gas subjected to circular spraying and absorbing through a chimney after being subjected to defogging. The streamer corona plasma flue gas denitrification method has the advantages of high denitrification efficiency, denitrification capacity, no need of catalysts, wild reaction conditions, little resistance and low energy consumption; and NOx is recycled, and a byproduct of an NH3NO3 fertilizer is obtained.

Description

technical field [0001] The invention relates to a streamer discharge plasma flue gas denitrification method. Background technique [0002] At present, NO in coal-fired flue gas X There are mainly two kinds of control methods: pre-combustion control and post-combustion control. The pre-combustion control is mainly low-nitrogen combustion technology, which reduces the formation of nitrogen oxides by improving the combustion state and fuel denitrification, such as the use of low-nitrogen oxide boilers; but due to some control of combustion process NO X The generated technology often reduces thermal efficiency, increases incomplete combustion loss, and increases equipment scale, while NO X The amount of reduction is limited, therefore, it has not yet fully reached the practical stage. Post-combustion control mainly includes: Selective Catalytic Reduction (SCR), Selective Non-Catalytic Reduction (SNCR) and biological filtration denitrification methods. SCR technology has the ...

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Problems solved by technology

SCR technology has the following problems: the catalyst is expensive, easy to poison and lose reactivity, resulting in high operating costs; ammonia remains in the reactor, forming sulfuric acid such as ammonium sulfate to block equipment, ammonia leakage forms secondary pollution; carbon monoxide is used as catalyst, the same will reduce thermal efficiency

The temperature required for the SNCR reaction is above 900°C, no catalyst is required, old equipment can be used for transformation, and the investment is low, but the consumption of reducing agent is large, the denitrification efficiency is not high, and there are also ammonia leakage and the generation of N 2 O, CO and other secondary pollution problems

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