Wet electrostatic precipitator rear segment spraying program control optimized water saving method

Abstract

The invention discloses a wet electrostatic precipitator rear segment spraying program control optimized water saving method. The water saving method comprises the steps that firstly, a wet electrostatic precipitator circulating water quality solid containing amount online monitor is additionally arranged, so that the water quality of wet electrostatic precipitator circulating water is ensured; secondly, by automatically reading the current unit load and the spraying duration and period set at the corresponding load, the rear segment spraying water opening duration is automatically increased or decreased; thirdly, by means of newly increased spraying water amount calculated every 30 minutes, the drained waste water amount is synchronously calculated and adjusted, and wet electrostatic precipitator water balance is achieved; and fourthly, on the premise that the wet electrostatic precipitator circulating water quality solid containing amount meets the requirement, the amount of fresh water consumed by a wet electrostatic precipitator is reduced as much as possible, the water amount of an absorption tower is synchronously reduced, and therefore it is guaranteed that a demister of the absorption tower carries out flushing according to requirements, longer flushing duration is provided, the demisting effect of the system demister is ensured, blockage is avoided, the industrial water consumption is reduced to the maximum extent, and the drainage frequency and the drainage waste water amount of the absorption tower are synchronously reduced; and by means of the method, the wet electrostatic precipitator water consumption is reduced, and the method has a remarkable effect on economical and environmental-friendly running of a coal-fired unit.

Description

technical field [0001] The invention relates to a program-controlled optimized water-saving method for post-wet electricity spraying, which is used for reducing the amount of spraying water in the back-stage of wet electricity, and belongs to the technical field of automatic control of post-wet electricity spraying. Background technique [0002] The post-spraying of wet electricity generally adopts regular spraying or continuous spraying, and the newly added wet electric spraying water after spraying is recycled to the spraying water tank for precipitation, and the solid content of the upper overflow water is in the normal range, which is supplied to the circulating water tank The circulating water pump is provided to the front-stage spraying. If the solid content is too high, it is necessary to increase the external drainage at the bottom of the return water tank to the desulfurization absorption tower to reduce the solid content of the wet power circulating water, so as to ...

AI Technical Summary

Problems solved by technology

[0002] The post-spraying of wet electricity generally adopts regular spraying or continuous spraying, and the newly added wet electric spraying water after spraying is recycled to the spraying water tank for precipitation, and the solid content of the upper overflow water is in the normal range, which is supplied to the circulating water tank The circulating water pump is provided to the front-stage spraying. If the solid content is too high, it is necessary to increase the external drainage at the bottom of the return water tank to the desulfurization absorption tower to reduce the solid content of the wet power circulating water, so as to ensure that the spray water of the anode plate in the front part of the wet power does not block the spray. Nozzles; the original design of the wet electricity rear-stage spray mostly adopts "timed spray", the principle is to automatically open the rear-stage spray water valve for 15 minutes every 30 minutes; because the evaporation of the desulfurization absorption tower is small when the unit is under low load , it is easy to cause the water consumption of wet electric spraying to be too large at low load, which will cause a large amount of wastewater discharged to the desulfurization absorption tower, causing the water level of the absorption tower to be too high and causing the demister of the absorption tower to fail to rinse, resulting in wet electricity and The water balance of the desulfurization absorption tower is difficult to control. In order to ensure the liquid level of the system, the amount of wastewater discharged outside the absorption tower is forced to increase. Load automatic adjustment", its water-saving ability is poor, and a large amount of process water is wasted, resulting in "timed spraying" in the actual application process, which often makes the absorption tower mist eliminator unable to wash, the frequency of gypsum slurry discharge in the absorption tower increases, and increases power consumption. The increase in water consumption, equipment wear, and wastewater treatment will also increase the corresponding power consumption, water consumption, and drug costs, and the density of gypsum slurry cannot be maintained within the normal range, making the filter cloth of the gypsum dehydration belt machine easy to be due to the low density of gypsum slurry and too fine particle size The blockage affects the dehydration of gypsum, which leads to the increase of moisture content and chloride ion concentration of gypsum cake, which affects the sales of gypsum and increases the demand for gypsum storage yards.

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