Demister flushing system capable of automatically adjusting water balance of desulfurizing tower and control method

Abstract

The invention provides a demister flushing system capable of automatically adjusting water balance of a desulfurization tower. The demister flushing system comprises a process water tank, a desulfurization tower, a multi-stage demister, a flushing system, a parameter measuring device and a DCS controller; the process water tank is connected with the multi-stage demister through a water pipe; the multistage demister is arranged in the desulfurization tower, and a flue gas inlet and a flue gas outlet are respectively formed in the desulfurization tower; the flushing system and the multi-stage demister are arranged adjacently; the parameter measuring device is arranged on the desulfurizing tower; the DCS controller is electrically connected with the parameter measuring device. The invention further provides a demister flushing control method using the flushing system. On the basis that the flushing effect of the demister is guaranteed, the system has the advantages that the flushing wateramount of the demister is adjusted according to the load and the liquid level, and water balance is automatically adjusted. Furthermore, the availability of equipment program automatic control is improved, and the working intensity of operators is reduced.

Description

technical field [0001] The invention relates to the technical field of demister flushing in a coal-fired thermal power plant, in particular to a flushing system and a control method for a demister that automatically adjusts the water balance of a desulfurization tower. Background technique [0002] Thermal power plants burn a large amount of fossil fuels such as coal, and the flue gas contains a large amount of acid gases such as SO2 and SO3, which will cause serious pollution to the environment, and the flue gas needs to be desulfurized. Among them, wet desulfurization technology has become the mainstream technology for gas desulfurization due to its high desulfurization efficiency and relatively cheap and easy-to-obtain raw materials. [0003] Wet desulfurization is mainly based on the limestone-gypsum method, using limestone slurry as the desulfurizer, the desulfurization efficiency is 90% to 95%, the highest can reach 99%, the desulfurization efficiency is stable, and th...

AI Technical Summary

Problems solved by technology

As a result, the normal flushing process is interrupted, and the normal flushing effect cannot be achieved

[0008] Since the current flushing system cannot guarantee the automatic operation of the flushing at high load or high liquid level, the operator can only operate frequently manually. Risk of clogging and fouling of the filter while increasing operator workload

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