Water balance control method based on desulfurization double-tower circulation low load of thermal power plant

Abstract

The invention relates to the technical field of desulfurization double-tower water balance control. The invention further discloses a water balance control method based on the desulfurization double-tower circulation low load of a thermal power plant. A desulfurization process is subjected to technical transformation, a water mechanical seal of a desulfurization slurry pump is changed into a water-free mechanical seal, and the process water supplementing amount of the whole system is reduced. A limestone slurry tank is changed into filtrate water for slurry preparation, cooling water of a slurry circulating pump speed reducer and cooling water of an oxidation fan flow back to an industrial water tank from a process water tank for closed circulation, the liquid level of an absorption tower,all boxes, tanks and pits is reduced, and favorable conditions are created for vigorously flushing a demister. According to the water balance control method based on the desulfurization double-towercirculation low load of a thermal power plant, water balance is controlled through six steps, the problems that flushing of a demister is affected and even the water balance is damaged due to the factthat too much water enters the system are effectively solved, normal operation of the system is guaranteed, the overall steps are simple and convenient, popularization is easy, use is convenient, andthe method is suitable for various conditions.

Description

technical field [0001] The invention relates to the technical field of desulfurization double-tower water balance control, in particular to a water balance control method based on the low-load cycle of a thermal power plant desulfurization double-tower cycle. Background technique [0002] Water balance refers to the dynamic balance between the water entering the system and the water dissipated or discharged from the system when the FGD system is in normal operation. . [0003] In the dual-tower dual-cycle flue gas desulfurization system, water balance is an important parameter of operation management, and the adjustment of water balance is an important aspect of the stable operation of the system. The cooling water entering the desulfurization system will cause too much water in the system, which will affect the flushing of the mist eliminator, and even destroy the water balance. The components are seriously blocked, the differential pressure of the system increases, the i...

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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a water balance control method based on the low-load desulfurization double-tower cycle of a thermal power plant, which has the advantages of controlling water balance, and solves the problem of using the closed cooling water cycle of the power plant as much as possible for the cooling water of large equipment Use, because a large amount of cooling water enters the desulfurization system, causing too much water in the system, affecting the flushing of the demister, and even destroying the water balance. When the water balance is positive, the liquid level of the absorption tower remains high, and the demister rarely Opportunities for flushing, serious blockage of components, increased differential pressure of the system, frequent surge of induced draft fan, failure to open the movable blade, loss of control of liquid level in the absorption tower, low concentration of slurry, difficulty in dehydration of gypsum, and can only be discharged to the emergency slurry tank to solve the urgent need In the end, the tanks, tanks and pits in the system are full of water, and this vicious circle eventually leads to the forced shutdown of the FGD system

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