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A kind of control method of blast furnace pulverized coal injection amount

A technology of pulverized coal injection and control method, which is applied to blast furnaces, blast furnace details, furnaces, etc., can solve problems such as difficult to meet the control accuracy of blast furnace coal injection volume, difficulty in detection of injection volume, and small self-adaptive ability, and achieve outstanding essence Unique characteristics, reliable design principles, and the effect of improving control accuracy

Inactive Publication Date: 2015-11-11
JIGANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the control of coal injection, stable pulverized coal injection and accurate injection volume are the basic requirements for the adjustment operation of coal injection volume in blast furnaces; since pulverized coal injection is the pneumatic conveying of gas-solid two-phase flow, the detection of injection volume becomes difficult , and the injection quantity adjustment system is a dynamic and random interference serious multi-input single-output nonlinear object. The traditional pulverized coal injection quantity control technology has the defects of large error and small self-adaptive ability, and it is difficult to meet the blast furnace coal injection quantity adjustment. control accuracy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0028] A method for controlling the amount of pulverized coal injection in a blast furnace, comprising the following steps:

[0029] Step (1): Start the coal injection tank for coal injection;

[0030] Step (2): Judging the coal injection time, if it is 5 minutes before the start of coal injection, go to step (3), if it is 5 minutes after the start of coal injection, go to step (4);

[0031] Step (3): Record the initial weight value of the current injection tank at the moment when coal injection starts. After coal injection starts, record the current weight value of the current injection tank every 5 seconds, and subtract the current weight value from the initial weight value to get Divide the difference by the injection time to obtain the instantaneous coal injection speed within 5 minutes before the start of coal injection;

[0032] Step (4): Sampling the weight value of the spray tank every 5 seconds, and storing the sampling results in 60 shift registers. The shift regist...

Embodiment approach 2

[0042] A method for controlling the amount of pulverized coal injection in a blast furnace, comprising the following steps:

[0043] Step (1): Start the coal injection tank for coal injection;

[0044]Step (2): Judging the coal injection time, if it is 5 minutes before the start of coal injection, go to step (3), if it is 5 minutes after the start of coal injection, go to step (4);

[0045] Step (3): Record the initial weight value of the current injection tank at the moment when coal injection starts. After coal injection starts, record the current weight value of the current injection tank every 5 seconds, and subtract the current weight value from the initial weight value to get Divide the difference by the injection time to obtain the instantaneous coal injection speed within 5 minutes before the start of coal injection;

[0046] Step (4): Sampling the weight value of the spray tank every 5 seconds, and storing the sampling results in 60 shift registers. The shift registe...

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Abstract

The invention relates to a control method of the pulverized coal injection quantity of a blast furnace. The method comprises the following steps: (1) determining an injection tank for injecting coal; (2) judging the instant coal injection speed; if it is 5 minutes before coal injection, entering into the step (3), and if it is 5 minutes after coal injection, entering into the step (4); (3) calculating the instant coal injection speed 5 minutes before coal injection; (4) calculating the instant coal injection speed 5 minutes after coal injection; (5) comparing the instant coal injection speeds in the steps (3) and (4) with the actual coal injection speed, and adjusting the coal injection quantity of the current injection tank according to comparison results; (6) storing current accumulative coal injection quantity, namely the instant coal injection speed within 5 minutes before injecting the coal to the injection tank and the instant coal injection speed 5 minutes after injecting the coal to the injection tank. According to the method, the calculated instant coal injection speed is relatively close to the actual instant coal injection speed, and the control precision of the coal injection quantity is improved.

Description

technical field [0001] The invention belongs to the technical field of blast furnace coal injection control, and relates to a calculation method, in particular to a control method for blast furnace pulverized coal injection amount. Background technique [0002] Blast furnace coal injection is an important technical measure with energy-saving and environmental protection effects vigorously promoted by the state. It not only conforms to the economic interests of production enterprises, but also conforms to the national industrial policy. [0003] The purpose of blast furnace coal injection is to save coke to the greatest extent and improve the technical and economic indicators of blast furnace ironmaking; in order to achieve this goal, it is necessary to increase the amount of coal injection as much as possible and maintain a high replacement ratio; , to reasonably control the amount of coal injection. [0004] In the blast furnace pulverized coal injection process, the injec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B5/00C21B7/24
Inventor 梁丽桢季陆伟
Owner JIGANG GRP