Absorption solution for NO in coal-fired flue gas and preparation method and application thereof

Abstract

The invention discloses absorption solution for NO in coal-fired flue gas and a preparation method and application thereof. The active ingredient of the absorption solution is dimethyl glyoxime cobalt ions ([Co(dmgH)2(H2O)2]<2+>). The preparation method comprises the following three steps of: preparing aqueous solution of bivalent cobalt salt, preparing ethanol solution of dimethyl glyoxime (dmgH), and mixing the aqueous solution of bivalent cobalt salt and the ethanol solution of dimethyl glyoxime (dmgH) to form the absorption solution for the NO in the coal-fired flue gas. The absorption solution for the NO in the coal-fired flue gas is used for removing the NO from the coal-fired flue gas in a coal-fired power plant. The absorption solution for the NO in the coal-fired flue gas is NO absorption solution which is difficult to volatilize and is nontoxic and environmental-friendly. The absorption solution can increase the solubility of the NO in a liquid phase and removes the NO by complexation and oxidation; the removal rate of the NO is over 70 percent; and secondary pollution is avoided in the absorption process.

Description

Technical field [0001] The invention relates to an absorbing liquid for NO in coal-burning flue gas, and a preparation method and application thereof. Background technique [0002] my country's energy is mainly coal-fired. Raw coal, which accounts for 75% of coal production, is used for direct combustion. NO produced during combustion is the main source of NOx in the atmosphere. It can cause human body poisoning, plant damage, acid rain formation, ozone depletion, and photochemical smog when it reacts with hydrocarbons. Endanger human health and cause huge economic losses. In 2004, the state promulgated the "Emission Standard of Air Pollutants for Thermal Power Plants", which imposed stricter requirements on NO emissions. Therefore, the denitrification of coal-fired flue gas in my country is very important. [0003] Since the mature desulfurization method widely used at present is the wet method, the improvement of the existing wet desulfurization process so that the desulfuriza...

AI Technical Summary

Problems solved by technology

[0004] In the cobalt complex denitrification methods that have been developed so far, the ligands generally use ammonia water or polyamines. These ligands are volatile, have certain toxicity, and are easy to form secondary pollution. The chemical absorbent consumes a lot and suffers serious losses. As a liquid, there are certain difficulties in transportation and use