Low-load absorption tower water balance adjusting process system

Abstract

The invention discloses a low-load absorption tower water balance adjusting process system, which belongs to the technical field of wet desulphurization, and comprises an absorption tower, a gypsum cyclone, a dehydrator, a filtrate tank, a return tower filtrate pump, an accident slurry tank, a pressure pump, a filter screen and a demister flushing water tank. According to the invention, the accident slurry tank is used for buffering, part of tower-returning filtrate is shunted to the accident slurry tank, and the problem of overhigh liquid level of the absorption tower in short time is solved.By means of the accident slurry box and the filter screen, filtrate returned to the tower can be used for washing the demister after being filtered, the problem that the liquid level of a long-term absorption tower is too high is solved, and safe and stable operation of a unit is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of wet desulfurization, and in particular relates to a low-load absorption tower water balance adjustment process system. Background technique [0002] The limestone-gypsum wet desulfurization technology is most widely used in the desulfurization process of power plants. The water balance of the absorption tower has an important impact on the safe operation of the desulfurization system. If the liquid level of the absorption tower is too high, the slurry will flow back into the clean flue, which will endanger the unit. safe operation. The water entering the absorption tower includes: water brought in by the original flue gas, water brought in by the oxidized air, demister flushing water, process make-up water, filtrate returned to the tower, and water brought in by limestone slurry; the water brought out of the absorption tower includes: clean smoke The air takes away the water, and the gypsum slurry takes ...

AI Technical Summary

Problems solved by technology

However, during low-load operation, if the water added to the absorption tower is greater than the water taken out, the liquid level of the absorption tower will rise, and it is even difficult to control

The main reason is to ensure that the differential pressure before and after the mist eliminator meets the requirements. When the load is low, the flushing of the mist eliminator still needs to maintain a certain frequency, which causes the amount of water added to the absorption tower to exceed the required water amount, causing the liquid level to be unbalanced.

In recent years, the annual operating hours of thermal power plants have been decreasing year by year, and the entire industry is in a stage of overcapacity. The power plants have been operating at low load for a long time, and the liquid level of the absorption tower is too high in some periods, which seriously threatens the safe operation of the power plant.

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