Computer Control of Electroslag Furnace in China Electroslag furnace is one of the main refining equipments for special steel and superalloy. Its equipment structure is relatively simple, the process is not complicated, the control parameters are less, and it is easy to collect. Therefore, it is very suitable for computer control of its smelting process. The earliest computer controlled electroslag furnace in China is a single shaft cable electroslag furnace imported from Germany by Qigang, followed by Shanggang No. 5, Northeastern University and Fushun Special Steel in electroslag. The furnace was researched on computer control, followed by the full-hydraulic computer-controlled ingot electroslag furnace developed by the Changchun Electric Furnace Plant for Taigang Steel Research Institute, and it was industrially tested and put into production.
Qigang and Taigang's electroslag furnaces can realize automatic ignition, automatic maintenance of electrode immersion depth, constant slag resistance, constant melting rate, decreasing melting rate, automatic filling and other control, as well as toxic flue gas purification generated by electroslag furnace smelting process. After processing, etc., satisfactory results have been obtained. Unfortunately, the computer is too backward. The domestically produced machine has already been phased out as soon as it is put into production. Therefore, the computer control system has not been running for a long time, and still uses the traditional control method to control the electroslag furnace. Some steel mills attach importance to the state's call for the use of information technology to transform traditional industries. For the electroslag steelmaking workshop, the electroslag furnace equipment process is very mature. The only thing that needs to be icing on the cake is computer control, soot purification treatment and new high-voltage electricity. Slag furnace and protective atmosphere electroslag furnace. There is no benefit in the treatment of soot, and no one pays attention. Many high-temperature slag furnace plants are not needed or urgently needed. Therefore, only computer control, some factories spend huge sums of money, unfortunately, in addition to the performance of the computer itself, other than the control of the year before.
Century and Century Electroslag Furnace Computer Control Comparison Table Lists Century and Century Electroslag Furnace Computer Controls), male, Jiangsu, associate professor, engaged in electroslag furnace equipment and process research unit, electroslag furnace transmission mode, voltage regulation method, electronic scale water temperature Measurement and control ignition method slag method soot purification recovery smelting control filling method computer furnace investment million yuan production time Qigang mechanical saturated reactor said electrode has automatic constant resistance constant speed variable melting speed automatic Taigang ingot hydraulic loaded multi-grade weighing ingot Automatically has the same automatic domestic Dalian factory mechanical tuning pressure manual constant current automatic microcomputer multi-fushun a factory mechanical magnetic pressure regulation electrode manual automatic constant melting speed automatic microcomputer multi-benxi a hydraulic unloaded multi-stage manual constant current automatic Multi-(computer system) Xingtai factory has a multi-stage microcomputer with multi-stage microcomputers. The computer control status of the electroslag furnace in several factories in China is listed. The equipment configuration, control parameters and production time are listed in the table.
Computer control of electroslag furnace is roughly divided into two types according to the steel produced by electroslag furnace. One type is steel containing easily oxidizable elements. It is required to remove harmful elements and inclusions in steel by electroslag refining, reduce microsegregation of components and improve The carbide distribution in the tool steel increases the density of the steel and improves the longitudinal and transverse mechanical properties of the steel, and is as consistent as possible, improving the uniformity of the quality of the whole ingot and the reproducibility of the quality of different heats. Such steels generally require deceleration of the melt rate control to ensure that the shape of the remelted ingot pool is stable and the depth is reasonable, and the decreasing melt rate is usually about (after entering the steady state). Another type of steel contains more oxidizable elements, and typical steel grades are high-temperature alloys. The change in the process of reoxidation of easily oxidized elements has a considerable relationship with the depth of immersion of the electrode, the temperature of the slag, and the free oxygen in the slag. Therefore, this type of steel requires a remelting process to ensure a constant immersion depth of the electrode, and a constant melting rate control, so as to achieve less flammable element burning loss, and uniform burning, to ensure uniform steel composition and consistent mechanical properties. In order to achieve the above two control basis, the electroslag furnace equipment must be properly configured to achieve true optimal control.
Electroslag furnace computer control equipment configuration and task main control equipment configuration remelting voltage must be continuously adjustable. It can adopt thyristor voltage regulation, saturation reactor voltage regulation or induction voltage regulating transformer, electronic scale and gravity sensor installed on the chuck, soot trapping and purifying device, electrode centering adjusting device, crystallizer, bottom water tank and water flow. And water temperature measurement and control device, electrode current and furnace port voltage sensor, computer system: computer, programmable controller, display, printer, etc.
With the above control system configuration, the electroslag furnace will achieve a highly automated operation. Except for the crystallizer, the bottoming pad, the arc-inducing agent, and the slag-filling material, all the remelting operations can be completed under the computer, as shown in the figure. .
The conclusions reviewed the computer control situation of China's century electroslag furnace, analyzed the current status of computer control of electroslag furnace in China, and proposed the most complete configuration and tasks of computer control equipment for electroslag furnace, and the control characteristics of different steel types. It is the electroslag furnace computer in the future. Control the direction of development.
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