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Feedforward control method of furnace top pressure of blast furnace

A feedforward control, blast furnace technology, applied in blast furnaces, blast furnace details, furnaces, etc., can solve the problem of low precision of large-lag control objects, and achieve the effect of overcoming slow response speed, forward running and increasing output, and improving control accuracy.

Inactive Publication Date: 2012-07-11
WISDRI ENG & RES INC LTD
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a feed-forward control method for blast furnace roof pressure to overcome the defect of low accuracy of the existing PID technology for large lag control objects

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  • Feedforward control method of furnace top pressure of blast furnace
  • Feedforward control method of furnace top pressure of blast furnace
  • Feedforward control method of furnace top pressure of blast furnace

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the embodiments and accompanying drawings.

[0020] The feed-forward control method for blast furnace roof pressure provided by the present invention is specifically as follows: by analyzing the technological process of the blast furnace, it is considered that the pressure equalization of the furnace roof distribution and the distribution tank is the main factor affecting the stability of the furnace roof pressure in the normal production process of the blast furnace. The internal relationship of its relevant parameters is used to establish the top pressure feed-forward control mathematical model of the furnace top distribution and pressure equalization process, and the corresponding stator vane angle control value in the process is calculated as the feed-forward amount, using the PID+feed-forward mathematical model method to control the top pressure; the top pressure feedforward control can act on...

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Abstract

The invention relates to a feedforward control method of furnace top pressure of a blast furnace, comprising the following steps: furnace top distribution and pressure equalizing of a material distributing tank are considered to be main disturbance factors affecting the stability of the furnace top pressure during normal production of the blast furnace through analysis of a blast furnace technical process, a feedforward control mathematical model for furnace top distribution and top pressure and a feedforward control mathematical model for pressure equalizing and top pressure of the material distributing tank are established through analysis of internal relations of relevant parameters, the corresponding static blade angle control value is computed by the models as feedforward amount, and the top pressure is controlled by a PID (Proportion Integration Differentiation) and the feedforward mathematical models; the top pressure feedforward control is performed after beginning of furnace top distribution and pressure equalizing of the material distributing tank, before the top pressure is changed, the feedforward amount acts on a TRT (top gas pressure recovery turbine) static blade in advance, so that the disturbance of the top pressure is eliminated during emergence, and top pressure fluctuation caused by disturbance is reduced. In the invention, the disturbance of the top pressure can be eliminated during emergence, so that the control precision of the top pressure of the blast furnace can be effectively improved and the smooth operation and output of the blast furnace can be facilitated to be improved.

Description

technical field [0001] The invention relates to the field of furnace top pressure control for blast furnace ironmaking, in particular to a feedforward control method for blast furnace top pressure. Background technique [0002] Among the control parameters of blast furnace ironmaking, furnace top pressure is one of the very important parameters. The control accuracy of furnace top pressure directly affects the smooth production and output of blast furnace. At present, the top pressure control methods at home and abroad mostly adopt the independent PID closed-loop control technology, because there are many disturbance factors of the top pressure, and the TRT top pressure control is a large lag control system, so the control accuracy can only be controlled at 4kPa or even above 5kPa. The forward movement and production of the blast furnace had a great impact. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a feed-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00
Inventor 李清忠万磊叶理德
Owner WISDRI ENG & RES INC LTD
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