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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, which is applied to chemical instruments and methods, program control in sequence/logic controllers, separation methods, etc., can solve problems such as the inability to automatically control the amount of desulfurization agent in the desulfurization system, and achieve change trust degree of effect

Active Publication Date: 2008-12-31
碧水蓝天环保集团有限公司
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  • Abstract
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  • Application Information

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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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  • 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. The process flow is shown in Figure 3.

[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, a STD-34J-1...

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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...

Claims

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Application Information

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