Anti-surge control method of blast furnace blower

An anti-surge and blower technology, used in pump control, mechanical equipment, machines/engines, etc., can solve the problems of inability to guarantee fans, waste of energy, etc., to eliminate pressure fluctuations and energy waste, and eliminate anti-surge curve offset. Effect

Active Publication Date: 2012-07-11
HANGZHOU ZETA TECH
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  • Claims
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Problems solved by technology

If the opening is too large and too fast, it will not only produce large flow and pressure fluctuations, which are unacceptable in the normal production of the blast furna

Method used

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  • Anti-surge control method of blast furnace blower
  • Anti-surge control method of blast furnace blower
  • Anti-surge control method of blast furnace blower

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Embodiment Construction

[0028] figure 1 Schematic representation of blast furnace blower operation. The blower is driven by an electric motor or a steam turbine. When in normal operation, the blower is in a safe area, the anti-surge valve is fully closed, and all the air enters the hot blast stove for heating. As the blower approaches the anti-surge curve, the anti-surge valve opens, venting air into the atmosphere, allowing the blower to increase its flow rate away from the anti-surge curve.

[0029] figure 2 is the dimensionless blast furnace blower anti-surge curve. Where p2 / p1 is the blast furnace blower compression ratio, for similar speeds, is a dimensionless flow. It can be seen from the figure that when the dimensionless calculation is adopted, the anti-surge curve does not change with the intake conditions.

[0030] image 3 The dimensionless flow representing the operating point is , the dimensionless flow at the anti-surge point is q s , so the distance between the actual ope...

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Abstract

The invention relates to the anti-surge control of a blower and aims at providing an anti-surge control method of a blast furnace blower. The anti-surge control method comprises the steps of: 1) conducting dimensionless treatment to an anti-surge curve to obtain the anti-surge curve which is not changed with an inlet condition and a structure; 2) obtaining real-time operating parameters, making a comparison with the dimensionless value of an anti-surge point after the dimensionless treatment and determining whether a current operating point is in a safe area or not; 3) determining the distance between the current operating point and the anti-surge curve and change speed in the current dimensionless flow direction and determining proportional-integral-derivative (PID) control parameters by taking the change speed as an input valve; and 4) transmitting the PID control parameters to the controller of an anti-surge valve to realize the control over the anti-surge valve. The anti-surge control method of the blast furnace blower has the advantages that the anti-surge curve offset caused by the change of the inlet condition and the structure is eliminated and the safe operating area can be accurately judged during operation; and the problems of pressure fluctuation and energy wastage caused by a reason that the anti-surge valve is opened too large or too small because the control parameters are fixed can be eliminated.

Description

technical field [0001] The invention relates to a blast furnace blower anti-surge method. More specifically, it is anti-surge control for blast furnace blowers in ironmaking blast furnaces. Background technique [0002] The blast furnace blower is the core power equipment in the ironmaking process, and the blast furnace blower is the heart of the blast furnace equipment. The high-pressure air flow delivered by the blower is heated to 1100-1200°C by the hot blast stove, and is blown into the blast furnace through the circular air duct installed in the lower abdomen of the blast furnace through the tuyeres installed around the blast furnace. On the one hand, it supports the charging bell from the furnace top. On the other hand, molten iron and slag are formed at the bottom of the furnace through chemical reduction reaction. If the air supply is cut off, the blast furnace cannot continue to produce molten iron. At the same time, because the force supporting the charge in the ...

Claims

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Application Information

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IPC IPC(8): F04D27/00F04D29/66
Inventor 吴平王小华杨春节麻剑锋郁辉球黄龙诚
Owner HANGZHOU ZETA TECH
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