A method for detecting and controlling the oxidation rate of desulfurization absorption liquid

Abstract

A method for detecting and controlling the oxidation rate of the desulfurization absorption liquid: 1) selecting a material point in the desulfurization absorption equipment that needs to detect and control the oxidation rate of the desulfurization absorption liquid, and setting temperature, pH, density, redox potential and other detection instruments at the material point; 2) Establish the relationship between the temperature, pH, density, redox potential real-time data and the ratio of the amount of sulfate in the desulfurization absorption liquid to the sum of the amount of sulfite and sulfate obtained by chemical analysis, that is, the oxidation rate; The oxidation-reduction potential of the absorption liquid solution is obtained to obtain the corresponding relationship between the oxidation rate of the desulfurization absorption liquid and the oxidation-reduction potential under the conditions of temperature, pH, and density; Reduction potential, calculate the oxidation rate of the desulfurization absorption liquid through the calculation model between the oxidation rate and the redox potential. The method solves the problems that the analysis cycle of the absorption liquid oxidation liquid is long and the production cannot be guided in time.

Description

technical field [0001] The invention belongs to the field of environmental protection, and relates to a method for detecting and controlling the oxidation rate of desulfurization absorption liquid in the process of wet flue gas desulfurization, and is especially suitable for ammonia method, sodium method, double alkali method, seawater method, calcium method and other wet flue gas desulfurization methods. Control of technological processes such as gas desulfurization. Background technique [0002] Wet flue gas desulfurization technology has high gas purification efficiency and is mainly used for desulfurization in thermal power plants, as well as desulfurization and dust removal in metallurgical and chemical enterprises. For a long time, due to the difficulty in detecting the oxidation rate of the desulfurization absorption liquid in the wet flue gas desulfurization process, the oxidation rate of the desulfurization absorption liquid cannot be adjusted in real time and canno...

AI Technical Summary

Problems solved by technology

For a long time, due to the difficulty in detecting the oxidation rate of the desulfurization absorption liquid in the wet flue gas desulfurization process, the oxidation rate of the desulfurization absorption liquid cannot be adjusted in real time and cannot be automatically controlled

[0003] The oxidation rate of the desulfurization absorption liquid cannot be controlled in real time, resulting in the following problems: 1) The operating flow rate of the oxidizing air is large, and the energy consumption cannot be optimized, resulting in energy waste; 2) The liquid-gas ratio is large, and energy saving cannot be optimized

3) The performance of the desulfurization process that mainly relies on sulfite to absorb sulfur dioxide, such as the ammonia method, cannot be stabilized and the operation is difficult

[0011] Although the desulfurization process such as the calcium method has no volatility problem, in order to ensure the quality of the by-products, the oxidation is generally overoxidized, and the oxidizing air has been running excessively, which consumes a lot of energy.

[0012] Therefore, it is necessary to control the oxidation rate of the desulfurization absorption liquid, but because the oxidation rate is mainly obtained by manual assay detection and analysis, there is no suitable on-line component analysis instrument, and there has been no means for detecting and controlling the oxidation rate in desulfurization projects for a long time. The requirements for improving and operating economy are increasing, and there is an urgent need to develop technologies for detecting and controlling oxidation rates

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