Energy-saving control system and method for wet desulphurization Roots blower

Abstract

The invention provides an energy-saving control system and method for a wet desulphurization Roots blower. The method comprises the following steps: automatically calculating a theoretical oxygen demand according to the total amount of SO2 removed by a wet desulphurization device or the amount of flue gas at the inlet of the desulphurization device, the concentration of SO2 in the flue gas at the inlet, the amount of flue gas at the outlet and the emission concentration value of SO2 in the flue gas at the outlet; and the motor frequency of an oxidation fan is automatically adjusted through double limiting conditions of the flow speed of an oxidation air pipeline and the gypsum quality, so that the optimal energy-saving effect is achieved. The energy-saving control method for the wet desulphurization Roots blower is high in automation degree, overcomes the defects that according to a traditional desulphurization slurry oxidation control method, the oxygen demand of desulphurization slurry sulfite is not matched with the actual air volume of an oxidation blower, and the peroxidation phenomenon occurs frequently; the gypsum quality and the safe and stable operation of the desulfurization device are ensured, and meanwhile, the energy conservation of the oxidation fan is realized.

Description

technical field [0001] The invention relates to the field of wet desulfurization environmental protection island control, in particular to an energy-saving control system and method for wet desulfurization Roots fan. Background technique [0002] Limestone-gypsum wet desulfurization is the most widely used flue gas desulfurization technology at this stage, and it is mainly used for sulfur dioxide in flue gas. The technical principle is that SO in flue gas 2 Chemically react with limestone slurry, oxidize and crystallize to form gypsum. During the desulfurization process, a large amount of oxidizing air needs to be blown in during the oxidation reaction of calcium sulfite to calcium sulfate. Conventional desulfurization systems adopt the method of blowing excess air to promote the reaction between calcium sulfite and oxygen. [0003] At present, the desulfurization system is put into operation, and the oxidation fan adopts the mode of continuous operation. Some power plan...

AI Technical Summary

Problems solved by technology

Some power plants, iron and steel plants, and coking plants have carried out some energy-saving transformations for the oxidation system, replacing the oxidation fan motor with a variable frequency motor and a permanent magnet variable frequency motor, which indeed have some energy-saving effects, but the effect is not very obvious, and often requires manual work. Adjustment, the degree of oxidation of the desulfurization slurry cannot be accurately controlled, so over-oxidation or under-oxidation often occurs, which brings safety hazards to the safe and stable operation of the desulfurization system

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