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Method for controlling air volume of air blower

A technology for air volume control and blower, applied in the field of control, can solve the problems of unsolved measurement device signal distortion, control loop fluctuation, sudden change of blast furnace air supply air volume blower unit, etc., to improve stability and automatic input rate, improve signal stability, Avoid the effect of large fluctuations

Active Publication Date: 2016-03-30
SHANGHAI MEISHAN IRON & STEEL CO LTD
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Problems solved by technology

[0004] The devices and control methods used in the above two patents have been widely used in blower units, but they have not solved the problem that the measuring device is susceptible to environmental influences and signal distortion, causing fluctuations in the control loop, resulting in sudden changes in the air supply volume of the blast furnace and even causing the blower unit to enter surge running technical problems

Method used

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  • Method for controlling air volume of air blower
  • Method for controlling air volume of air blower
  • Method for controlling air volume of air blower

Examples

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Embodiment 1

[0050] Example 1: A blower air volume control method, the control method is as follows: Take Meishan Iron and Steel 2# blower as an example,

[0051] Step 1. Introduce the concept of air volume at the inlet of blower 1, and use the throat differential pressure to initially reflect the air volume at the inlet of the axial flow compressor according to the working principle of the blower;

[0052] Step two, such as figure 1 As shown, the flow calculation is performed by using the throat differential pressure 8, throat differential pressure 9, throat differential pressure 10, inlet air pressure 11, and inlet air temperature 12 to calculate the air volume at the inlet of the blower unit.

[0053] (Formula 1);

[0054] Among them, Fa: predicted inlet air volume;

[0055] ?p: Throat differential pressure, sent to the DCS control system 18 through the throat differential pressure transmitter, and the final throat differential pressure value is obtained by taking the median value...

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Abstract

The invention relates to a method for controlling the air volume of an air blower. According to the method, the idea that automatic control over a stationary blade is conducted by means of the inlet air volume of the air blower is provided for the first time. A calculation method for the inlet air volume is provided. Measurement signals obtained through indoor measurement devices and slightly restrained by environment factors can be accurately used for calculating the inlet air volume. The measurement effect that the inlet air volume is consistent with the outlet air volume is achieved. The stability and the automatic input rate of an automatic air volume control loop are increased.

Description

technical field [0001] The invention relates to a control method, in particular to a control method for stably supplying air to a blast furnace by controlling the air volume at the inlet or outlet of a blower. Background technique [0002] The blower is a power station that uses a gas compressor to pressurize the atmosphere to supply the air required for blast furnace smelting. When the blower supplies air to the blast furnace, stable air supply is very important for blast furnace tapping. Production experience shows that a constant air volume into the furnace is beneficial to the blast furnace to maintain the normal falling speed of the charge, uniform combustion, and active hearth, which is an important condition for the stable, high-quality and high-yield of the blast furnace. Therefore, the use of constant air volume automatic control is a necessary measure to improve the quality of air supply. Most domestic blast furnace blowers are still difficult to realize the stab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00
Inventor 顾蓉艾军邢莉华曾大光
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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