Evaporation treatment controlling method for wastewater from wet flue gas desulfurization

Abstract

The invention discloses an evaporation treatment controlling method for wastewater from wet flue gas desulfurization, and belongs to the technical field of desulfurization wastewater treatment. The method comprises the steps as follows: flue gas is extracted from the front and the back of an air preheater respectively, and is mixed and then sent into an evaporation tower, and mixed flue gas is used for achieving evaporation treatment on desulfurization wastewater; a control system adopts feedforward control and cascade control to form control over the whole evaporation treatment process together. According to the evaporation treatment controlling method, cascade control is adopted, and automatic control and intelligent adjustment can be performed on the whole evaporation process according to the mixed flue gas flow and the flue temperature in an inlet of a dust collector, so that the system fault tolerance is improved, the response to abnormal changes of the flue temperature in the whole evaporation treatment process is timely, the response hysteresis is greatly reduced, real-time monitoring and adjustment can be performed, and the system operation safety is guaranteed.

Description

technical field [0001] The invention relates to an evaporation treatment method for wet flue gas desulfurization wastewater, which belongs to the technical field of environmental protection. Background technique [0002] Limestone gypsum wet desulfurization technology is currently the most common method for flue gas desulfurization in power plants, and in the process of using this method, there will be a certain amount of desulfurization wastewater, which often contains suspended solids and excessive heavy metal substances. It is weakly acidic. Therefore, if it is discharged directly, it will seriously harm the environment, and it needs to be treated and discharged after reaching the standard. At present, there is a desulfurization wastewater treatment method is evaporation treatment: the desulfurization wastewater is introduced into the waste water tank, and the wastewater is sprayed into the evaporation tower with a wastewater metering pump, and the flue gas is extracted f...

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Problems solved by technology

Its disadvantage is that the simple fuzzy processing of information will lead to the reduction of control accuracy and dynamic quality of the system, and the stability of the system cannot be guaranteed.

If you want to improve the accuracy, you must increase the number of quantization series, which will lead to the expansion of the rule search range, reduce the decision-making speed, and even make real-time control impossible.

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