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

A circulating fluidized bed and control system technology, applied in chemical instruments and methods, program control in sequence/logic controllers, separation methods, etc. degree of effect

Active Publication Date: 2012-05-02
碧水蓝天环保集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

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Embodiment 1

[0034] The tonnage of a circulating fluidized bed boiler in a power plant is designed to be 2×75t / h+1×90t / h, and the desulfurization method of the present invention is adopted, and the process flow is as follows image 3 shown.

[0035] The specific design basis is as follows:

[0036] Sulfur content in coal ≤ 1.7%

[0037] During normal production, the coal consumption of a single boiler is ≤14.5t / h

[0038] Boiler flue gas volume 150000m 3 / h

[0039] SO before desulfurization 2 Emission concentration 2660mg / Nm 3

[0040] Implement the method that the present invention applies PLC control system to implement the calcium spray desulfurization in circulating fluidized bed boiler furnace:

[0041] Purchased desulfurizer --- limestone pressure tanker 1, pneumatically conveyed (0.2MPa) to 100m by the on-board pump 3 In the storage bin 2, the particle size of the desulfurizer is required to be 0.01-1mm. The top of the storage bin is equipped with a pressure release valve 3...

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Abstract

The invention discloses a method for implementing calcium spraying and desulfurization inside a circulating fluidized bed boiler by using a PLC control system, comprising: transporting and storing outsourcing desulfurizer, feeding by a star unloader, measuring by using a solid flowmeter, transporting by using a helicoidal pump, and blowing powder into the boiler by a lobe fan for calcination and desulfurization. A flue gas SO2 sampling device is arranged on a chimney, and 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. A motor of the unloader is controlled by the PLC to rotate in the frequency conversion, 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/83B01D53/50G05B19/05
Inventor 朱学智
Owner 碧水蓝天环保集团有限公司
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