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Control method of mechanical vacuum pump system based on RH refining process

A mechanical vacuum pump and control method technology, applied in pump control, mechanical equipment, liquid variable capacity machinery, etc., can solve the problems of low control efficiency, high energy consumption, weak responsiveness, etc., and achieve high control efficiency and good safety. , responsive effect

Active Publication Date: 2020-11-03
CHINA NAT HEAVY MACHINERY RES INSTCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the control method of the mechanical vacuum pump system based on the RH refining process provided by the present invention is to overcome the mechanical vacuum pump pumping capacity that is not seen in the prior art due to changes in the RH refining operation, RH refining mode, molten steel waste gas volume and production steel grades The mechanical vacuum pump system needs intelligent adaptability and protective control adjustment; the second purpose is to overcome the weak response to the RH refining process changes in the prior art, low control efficiency, high energy consumption, poor safety, and no Intelligent problem

Method used

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  • Control method of mechanical vacuum pump system based on RH refining process
  • Control method of mechanical vacuum pump system based on RH refining process
  • Control method of mechanical vacuum pump system based on RH refining process

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Such as figure 1 As shown, a control method of a mechanical vacuum pump system based on the RH refining process, the specific steps are as follows:

[0031] 1) Pre-draw after the preparation work is completed;

[0032] 2) After the pre-pumping is finished, select a mode; the control mode includes one or more of free mode, light treatment mode, deep degassing mode, oxygen blowing decarburization mode and pumping mode;

[0033] 3) Select the selected control mode according to the mode, and start the vacuum treatment;

[0034] 4) Start and stop the pumps at all levels and adjust the pump frequency until the treatment is completed;

[0035] 5) Enter the standby process;

[0036] 6) Determine whether to stop according to the shutdown conditions: if it is judged not to stop, then enter the mode selection again, if it judges to stop, then enter the shutdown process to stop;

[0037] 7) The steps 1) to 6) all need fault monitoring.

[0038] The invention is applicable to a...

Embodiment 2

[0042] On the basis of Example 1, the specific method of the pre-pumping is as follows: compare the rated pumping time of the pump with the set pre-pumping time, compare the vacuum system pressure of the pump with the set pre-pumping pressure in real time, and if it is greater than the set When the deviation value is reached, the frequency conversion speed regulation and quantity regulation of the multi-stage pump are carried out and the target pressure is reached, and the pre-pumping ends.

[0043] The pre-pumping is carried out through the pre-pumping module, and the target pressure can be reached through the pre-pumping of the pre-pumping module, and the pre-pumping module is an existing intelligent control module for consumption reduction.

[0044]Such as figure 2 As shown, the specific method of the free mode is: set the target pressure, determine the number of pump operation stages, and start the vacuum. When the target pressure is reached, enter the pressure closed-lo...

Embodiment 3

[0059] On the basis of Example 2, the method of the standby process is: when the vacuum shut-off valve is closed and the vacuum chamber is repressurized, during the process of replacing the molten steel, according to the pump stop conditions, the mechanical vacuum pump is gradually turned off from the front stage to the rear stage , to maintain the low-frequency operation of the final mechanical vacuum pump, to carry out nitrogen cleaning of the dust collector and to remove dust and cool down the pump chamber step by step. When the actual standby time is greater than the set time and the molten steel is replaced, the mechanical vacuum pump is controlled according to the selected control mode. The standby process performs standby processing of the mechanical vacuum pump system through the existing standby control module.

[0060] Further, the method of shutting down the process is as follows: when the vacuum cut-off valve is closed and the vacuum chamber is repressurized, after ...

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Abstract

The invention belongs to the technical field of automatic control over molten steel external refining equipment, and particularly provides a control method of a mechanical vacuum pump system based onan RH refining process. The control method comprises the following specific steps of conducting pre-pumping after preparation work is finished; after pre-pumping is finished, conducting mode selection; starting vacuum treatment according to a control mode selected by mode selection; starting and stopping each stage of pump and adjusting the pump frequency until the treatment is finished; enteringa standby process; and judging whether shutdown is needed or not according to a shutdown condition, if it is judged that shutdown is not needed, entering mode selection again, and if it is judged thatshutdown is needed, entering the shutdown process to achieve shutdown. The steps all need fault monitoring, the problems that an existing RH refining process is poor in responsiveness to changes, lowin control efficiency, high in energy consumption, poor in safety and not intelligent are solved; mechanical pump system adaptability adjustment conducted due to influences of an RH refining processmethod and molten steel waste gas amount changes on the air exhaust capacity of the mechanical vacuum pumps is achieved; and meanwhile, the protection function of long-term stable operation of the mechanical vacuum pumps is achieved.

Description

technical field [0001] The invention belongs to the technical field of automatic control of refining equipment outside a molten steel furnace, and in particular relates to a control method of a mechanical vacuum pump system based on an RH refining process. Background technique [0002] As we all know, vacuum refining is widely used in the molten steel treatment process, which is a necessary process for the production of high-quality steel and an important means of producing high value-added steel. The process of RH vacuum refining is that under vacuum condition, the molten steel is circulated and degassed in the vacuum tank, and the exhaust gas passes through the vacuum tank, the exhaust pipe, the gas cooling dust collector in turn, and then is discharged to the atmosphere through the mechanical vacuum pump system, and finally reaches the goal of purifying the molten steel. Purpose. The mechanical vacuum pump system is the core system for establishing a vacuum environment. ...

Claims

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Application Information

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IPC IPC(8): F04B49/06F04B41/06F04B37/14F04B51/00C21C7/10
CPCF04B49/06F04B41/06F04B37/14F04B51/00C21C7/10
Inventor 吴建龙任彤杨洪音方杞青马正锋
Owner CHINA NAT HEAVY MACHINERY RES INSTCO
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