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Hearth negative pressure control method and control system

A technology of furnace negative pressure and control method, which is applied in furnace negative pressure control system and furnace negative pressure control field, and can solve the problems of large throttling loss of baffle plates and the like

Inactive Publication Date: 2014-06-18
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The negative pressure state of the furnace is maintained by the induced draft fan installed in the boiler ventilation system. In the prior art, the negative pressure of the furnace is controlled by adjusting the opening of the induced draft fan baffle under the condition that the motor speed of the induced draft fan is kept constant. The size is regulated, but this will cause a large throttling loss of the baffle, so it is necessary to carry out energy-saving transformation of the induced draft fan

Method used

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  • Hearth negative pressure control method and control system
  • Hearth negative pressure control method and control system
  • Hearth negative pressure control method and control system

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Embodiment 4

[0071] Based on Embodiment 4, Embodiment 5 of the present invention discloses another furnace negative pressure control system to realize energy-saving transformation of induced draft fans. See Figure 5 , including a furnace negative pressure measuring device 101, a frequency converter 102, a rotational speed measuring device 103, a controller 104, an induced draft fan baffle 105, an induced draft fan baffle actuator 106, a frequency conversion control switch K1, and an actuator connected to the induced draft fan baffle 106 and the power frequency control switch K2 between the common end of the induced draft fan motor M and the power supply, wherein:

[0072] The induced fan baffle actuator 106 is connected to the induced fan baffle 105, and is used to provide the induced fan baffle 105 with a driving force for adjusting the opening of the baffle;

[0073] The controller 104 is also connected to the industrial frequency control switch K2 and the induced draft fan baffle actua...

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Abstract

The embodiment of the invention discloses a hearth negative pressure control method. The hearth negative pressure control method comprises the steps of obtaining a measurement value furnace negative pressure; calculating deviation between the measurement value and a given expected value of furnace negative pressure; when the deviation is judged not to meet a preset allowable deviation range, adjusting the revolving speed of a motor of an induced draft fan till the motor of the induced draft fan operates at expected revolving speed, so as to realize the energy-saving reformation of the induced draft fan. Besides, the invention additionally discloses a hearth negative pressure control system.

Description

technical field [0001] The invention relates to the technical field of boiler control, and more specifically, to a furnace negative pressure control method and a furnace negative pressure control system. Background technique [0002] Furnace negative pressure is an important parameter related to the safe and economical operation of the boiler. When the furnace negative pressure is kept within the normal pressure range, it can significantly increase the residence time of suspended coal particles in the furnace, increase settlement, reduce fly ash, and improve combustion efficiency. coal efficiency. [0003] The negative pressure state of the furnace is maintained by the induced draft fan installed in the boiler ventilation system. In the prior art, the negative pressure of the furnace is controlled by adjusting the opening of the induced draft fan baffle under the condition that the motor speed of the induced draft fan is kept constant. The size is regulated, but this will c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23N3/00
Inventor 赵忠华杨建东何明生
Owner LAIWU IRON & STEEL GRP
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