Limestone-gypsum method based oxidation control method for flue gas desulfurization slurry

Abstract

The invention belongs to the field of oxidation process control of desulfurization slurry, and relates to a limestone-gypsum method based oxidation control method for flue gas desulfurization slurry.A coarse regulation strategy for oxidation air volume is calculated on the basis of SO2 concentration of flue gas and flue gas flow, actual ORP value of the desulfurization slurry in an absorption tower is taken as a precise regulation strategy, and whole desulfurization oxidation is controlled. With the adoption of one intelligent automatic control method for the oxidation process of the desulfurization slurry, the problems that oxygen demand of sulfite of the desulfurization slurry is not matched with the actual air volume of an oxidation fan and overoxidation and underoxidation phenomena occur frequently in the traditional desulfurization slurry oxidation control method are solved, and timeliness and safety of oxidation control are enhanced.

Description

technical field [0001] The invention belongs to the field of desulfurization slurry oxidation process control and relates to a limestone-gypsum flue gas desulfurization slurry oxidation control method. Background technique [0002] Limestone-gypsum wet desulfurization is the most widely used flue gas desulfurization technology at this stage, and it is mainly used to remove sulfur dioxide produced by the massive combustion of fossil fuels such as coal. Sulfur dioxide can not only directly cause harm to the ecological environment, but also is an important precursor for the formation of acid rain and haze. Therefore, "ultra-low emission" with stricter requirements on pollutants has also been promoted and implemented in recent years. The mechanism of limestone-gypsum desulfurization is that the SO in the flue gas in the absorption tower 2 Limestone (CaCO 3 ) reaction, and then oxidized by blown air to form by-product gypsum (CaSO 4 2H 2 O) Crystals. At present, there is onl...

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Problems solved by technology

[0004] The problem to be solved by the present invention is that in the current desulfurization system, the pH of the desulfurization slurry is only controlled in real time from the perspective of desulfurization efficiency and the concentration of exhaust gas pollutants, but the stage of sulfite oxidation to sulfate radical is not accurately controlled. The oxygen demand of sulfite does not match the actual air volume of the oxidation fan, and over-oxidation and under-oxidation occur frequently, resulting in excessive sulfite content in the desulfurization slurry, causing system fouling, affecting the quality of the desulfurization by-product gypsum or the air volume of the oxidation fan Excessive energy waste

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