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Control method for blast furnace closed-loop distributing system

A cloth system and control method technology, applied in the field of control, can solve the problems of increased weighing error, affecting the accuracy of cloth, labor and other problems, and achieve the effect of precise control

Active Publication Date: 2013-12-18
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The choice of material distribution mode depends on the shape and distribution of the material surface. Since the inside of the blast furnace is a high-pressure container, it is necessary to perform pressure equalization and release when the blast furnace is distributed. The amount of gas passing through the top of the furnace is as high as 10000m per minute 3 , the gas carries a large amount of dust, and the temperature is as high as 200°C. It is difficult to directly obtain the shape of the furnace top material surface, and the change of the furnace top material surface shape can only be evaluated indirectly through the change of the temperature of the furnace top gas.
Due to the above reasons, although the blast furnace bellless distribution chute can theoretically carry out single-point, fan-shaped, single-ring, multi-ring, spiral and other distribution modes, in fact, single-point and fan-shaped distribution modes for dealing with abnormal furnace conditions are rarely used. Most of the distribution chutes are multi-loop distribution, which is an open-loop distribution mode, which is not only time-consuming and laborious, but also only approximate evaluation, and cannot be precisely controlled

Method used

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  • Control method for blast furnace closed-loop distributing system
  • Control method for blast furnace closed-loop distributing system
  • Control method for blast furnace closed-loop distributing system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The blast furnace closed-loop material distribution system shown in the figure includes a phased array radar, a detection module and a PLC, and its control method steps are as follows:

[0027] S1. Collect the blast furnace airflow status, blast furnace operation furnace type status, hearth working status, and determine the material distribution adjustment;

[0028] S2. According to the formula

[0029] f set =8.5×10 -8 x 5 -1.4×10 -6 x 4 -1.5×10 -4 x 3 +3.5×10 -3 x 2 -0.006x+1.4

[0030] where f set It is a curve in the xof coordinate system with the blast furnace center as the origin, the blast furnace central axis as the ordinate downward, and the blast furnace radial direction as the abscissa,

[0031] Set the material surface shape curve that needs to be achieved;

[0032] S3. The phased array radar obtains the current material level information, and transmits the acquired material level information to the detection module;

[0033] S4. The detection m...

Embodiment 2

[0043] In the solution described in Embodiment 1, steps S1-S4 are performed to determine the current material surface shape as: f now =8.4×10 -8 x5 -1.39×10 -6 x 4 -1.49×10 -4 x 3 +3.47×10 -3 x 2 -0.006x+1.39;

[0044] Execute steps S5-S9;

[0045] S10. Since the calculation result σ=0.376, which is less than the critical value 0.5, there is no need to modify the cloth matrix to be used.

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PUM

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Abstract

The invention relates to a control method for a blast furnace closed-loop distributing system. The blast furnace closed-loop distributing system comprises a phase array radar, a detection module and a PLC (programmable logic controller). The control method comprises the following steps of: determining whether to perform distributing or not; setting a shape of a material surface; acquiring information of the material surface; determining the current shape of the material surface; calculating furnace charge distribution after the material surface is changed; modifying an dip angle and a cylinder number while influence of rolling and deformation is considered, and determining a distributing matrix; transmitting the distributing matrix to the PLC; executing distributing by the PLC; calculating distributing error sigma; and if the sigma is more than 0.5, modifying the distributing matrix, and distributing again. According to the control method provided by the invention, distributing is automatically executed according to the shape of the set material surface by the PLC, and the disturbing matrix is automatically modified according to the actual material surface condition detected by a phase control radar in operation of a blast furnace until the desired material surface is obtained. By adopting the control method provided by the invention, accurate distributing control can be realized, and the blast furnace can operate in the best interval.

Description

technical field [0001] The invention relates to a control method, in particular to a control method for a closed-loop material distribution system of a blast furnace. Background technique [0002] Large blast furnace volume up to 2000-5500m 3 , The charge reacted in the blast furnace every day is as high as tens of thousands of tons, which has the characteristics of huge volume, many influencing factors, long response lag time, etc., and it is difficult to control. Usually, both the upper adjustment and the lower adjustment are used to control the production of the blast furnace. The lower adjustment controls the blast parameters of the tuyere, and the upper adjustment controls the blast furnace material distribution. The upper adjustment is the core of blast furnace control. The blast furnace transports the coke, ore and other furnace materials to the furnace roof through the skip car or the belt, and loads them to the blast furnace roof through the distribution chute to f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B5/00C21B7/00
Inventor 陈令坤胡正刚柏文萍尹腾赵思
Owner 武汉钢铁有限公司