Method for spraying calcium and devulcanizing in circulating fluid-bed boiler using PLC control system

Abstract

The invention discloses a method which applies in a PLC control system to implement calcium spraying and desulfurization inside a circulating fluidized bed boiler, comprising the steps that outsourcing desulfurizer is transported and stored; a star unloader is used for feeding, a solid flowmeter is used for measuring, and a helicoidal pump is used for transporting; powder lot is blown into the boiler for calcination and desulfurization by a lobe fan; a flue gas SO2 sampling device is arranged on a chimney, the concentration value of SO2 which is measured by a monitor is uploaded to the monitoring network of environment protecting department in a wireless way by a data collecting instrument, at the same time, the concentration value of SO2 is transmitted to the PLC control system by the on-line monitor of the SO2; the frequency conversion rotating speed of a motor of the unloader in controlled by the PLC, so that the desulfurizer can be automatically added; wherein, the instantaneous and integrated flow of the solid flowmeter is transmitted to the monitoring network of environment protecting department by the PLC for being referred in real time. The method realizes the automatic control of a desulfurization system and on-line monitoring of the usage of limestone powder in real time, at the same time, the desulfurization efficiency is improved, thus remarkably saving the usage of limestone powder, reducing the running cost, and simultaneously lightening the labor intensity of operating staffs.

Description

technical field [0001] The invention relates to a method for dry desulfurization of a circulating fluidized bed boiler, in particular to a method based on flue gas SO 2 On-line monitoring of feedback data, the application of PLC control system to implement the method of automatic control of calcium injection desulfurization in circulating fluidized bed boiler furnace. Background technique [0002] At present, the well-known circulating fluidized bed boiler dry desulfurization technology controls the desulfurization system and SO 2 Concentration monitoring is done manually by the operator. The delivery of limestone powder to the circulating fluidized bed boiler is mainly to simply add desulfurizer powder to the coal conveyor belt, but not to automatically control the operation of the desulfurization system to achieve the purpose of continuously delivering limestone powder to the circulating fluidized bed boiler , resulting in uneven addition of limestone powder, low utiliza...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the deficiency that the existing dry desulfurization technology cannot automatically control the desulfurization system and monitor the amount of desulfurizer in real time, the problem to be solved by the present invention is to provide a 2 On-line monitoring of feedback data, application of PLC control system to implement the method of desulfurization by spraying calcium in the furnace of circulating fluidized bed boiler

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