Vacuum system of RH furnace

Abstract

The utility model relates to an RH furnace vacuum system which comprises a vacuum pump system, a blanking system and a molten steel processing system, the vacuum pump system is respectively connected to the blanking system and the molten steel processing system through pipelines, and the blanking system is connected with the molten steel processing system through a pipeline. A telescopic joint is arranged between connecting pipelines of the discharging system and the molten steel treatment system, a sealing gasket and a steel plate are pressed tightly when the telescopic joint extends out, and the vacuum pump system and the discharging system form a closed system; the sealing gasket and the steel plate are arranged between the expansion joint and the alloy baffle box, and the sealing gasket and the steel plate are pressed tightly when the expansion joint extends out, so that the vacuum pump system and the blanking system form a closed system, which system leaks can be easily determined, the troubleshooting range can be quickly narrowed, a leakage point can be quickly found, and the troubleshooting time is greatly shortened.

Description

TECHNICAL FIELD

[0001] The utility model relates to metallurgical machinery technical field especially relates to a RH furnace vacuum system. BACKGROUND

[0002] The RH furnace vacuum system is a system with high sealing requirement, and it is easy to overlook the judgment when some stable parts suddenly appear leakage points, and the vacuum degree cannot be quickly restored, the troubleshooting is difficult and takes a long time, which seriously restricts the stability of the vacuum system, therefore, it is urgent to shorten the troubleshooting time and accurately find the leakage position.

[0003] The Chinese patent with the publication number CN113063547B discloses a RH furnace vacuum system leakage finding method, which comprises the following steps: A. macroscopically judging whether the leakage is in the hot zone or the pump zone; B. judging the pump zone when the leakage is in the pump zone, and visually inspecting when the leakage is in the hot zone; C. the pump zone judgment comprises pump zone overall leakage judgment, pump zone external leakage judgment and pump zone internal leakage judgment; D. performing pump zone overall leakage judgment, calculating the leakage flow L of the pump zone, comparing the leakage flow L of the pump zone with the design requirement to determine whether to perform subsequent judgment; E. performing pump zone external leakage judgment: calculating the external leakage flow H of the pump zone and the leakage area S, comparing S with the area of the joints of each device in the pump zone to find the external leakage point; F. performing pump zone internal leakage judgment: closing the valves in the pump zone in sections, pumping the vacuum in each section of the pump zone, and detecting the vacuum degree of each section of the pump zone; but the premise of the patent is macroscopic judgment of the leakage area, and it is not easy to macroscopically judge when the stable part suddenly appears a leakage point or belongs to slow leakage, so a lot of time is still needed for troubleshooting. SUMMARY

[0004] The utility model provides a kind of RH furnace vacuum system, can be easily determined which specific system appears leakage, rapidly narrow the scope of investigation, find leakage point quickly, greatly shorten the troubleshooting time.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A kind of RH furnace vacuum system, including vacuum pump system, discharging system and molten steel processing system, the vacuum pump system is connected to discharging system and molten steel processing system by pipeline respectively, the discharging system is connected to molten steel processing system by pipeline, the connecting pipeline between the discharging system and molten steel processing system is equipped with expansion joint, the expansion joint is sequentially provided with sealing pad and a steel plate with a thickness of 10-15mm at the connection with molten steel processing system, the sealing pad is pressed tightly with the steel plate when the expansion joint is extended, so that the vacuum pump system and the discharging system form a closed system.

[0007] Further, the blanking system comprises an evacuation valve, an air valve, an evacuation pipeline, an upper plunger bin, a lower plunger bin, a horizontal vibrator, an aluminum bucket, a ferrosilicon bucket, a blanking pipeline and a collecting pipe, the lower plunger bin is provided with the horizontal vibrator at the bottom, and the upper part of the lower plunger bin is connected with the evacuation pipeline through a pipeline, the pipeline at the upper part of the lower plunger bin is provided with the evacuation valve and the air valve, the horizontal vibrator, the aluminum bucket and the ferrosilicon bucket are connected to the collecting pipe through the blanking pipeline at the lower part, and the collecting pipe is connected with the expansion joint.

[0008] Further, the vacuum pump system comprises a condenser, an S1 pump and an S2 pump, one end of the condenser is connected with the evacuation pipeline, the other end is connected with the S2 pump, and the S2 pump is connected with the S1 pump.

[0009] Further, the molten steel treatment system comprises an alloy baffle box, a hot top cover, a vacuum chamber, a molten steel tank and a dust valve, one end of the hot top cover covers the top of the vacuum chamber, the other end is connected with the dust valve through a pipeline, the dust valve is connected with the vacuum pump system, the vacuum chamber is provided with the molten steel tank at the lower end, the vacuum chamber is connected with the alloy baffle box through a pipeline, and the sealing gasket and the steel plate are sequentially arranged between the expansion joint and the alloy baffle box.

[0010] Further, the sealing gasket is a circular ring sealing gasket with a thickness of 10-15 mm.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0012] 1) The sealing gasket and the steel plate are arranged between the expansion joint and the alloy baffle box, the sealing gasket and the steel plate are pressed tightly when the expansion joint is stretched out, a closed system is formed between the vacuum pump system and the blanking system, it can be determined which system leaks specifically, the range of troubleshooting can be quickly narrowed, the leakage point can be quickly found, and the troubleshooting time is greatly shortened.

[0013] 2) From the time when the vacuum degree cannot be lowered each time, the vacuum degree needs to be checked for about three days to the present, only two hours are needed, the leakage can be quickly found, timely treatment is carried out, production is ensured to proceed smoothly, and the vibrator failure rate is further reduced. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structural schematic view of the RH furnace vacuum system.

[0015] In the drawing: 1. Evacuation valve 2. Air valve 3. Upper plunger bin 4. Lower plunger bin 5. Horizontal vibrator 6. Aluminum bucket 7. Ferrosilicon bucket 8. Blanking pipeline 9. Expansion joint 10. Steel plate 11. Alloy baffle box 12. Vacuum chamber 13. Molten steel tank 14. Hot top cover 15. Dust valve 16. S1 pump 17. S2 pump 18. Evacuation pipeline 19. Condenser DETAILED DESCRIPTION

[0016] The utility model discloses a kind of RH furnace vacuum systems, including vacuum pump system, discharging system and molten steel processing system, the vacuum pump system is connected to discharging system and molten steel processing system respectively by pipeline, the pipeline of discharging system is connected molten steel processing system, expansion joint 9 is equipped between the connecting pipeline of discharging system and molten steel processing system, expansion joint 9 and molten steel processing system connection place are sequentially provided with sealing gasket and a 10mm thick steel plate 10, expansion joint 9 is extruded and sealing gasket and steel plate 10 are pressed tightly, so that vacuum pump system and discharging system form a closed system.

[0017] See Figure 1 , the structure diagram of the RH furnace vacuum system of the utility model. The utility model discloses a kind of RH furnace vacuum systems, including vacuum pump system, discharging system and molten steel processing system, the vacuum pump system is connected to discharging system and molten steel processing system respectively by pipeline, the pipeline of discharging system is connected molten steel processing system, expansion joint 9 is equipped between the connecting pipeline of discharging system and molten steel processing system, expansion joint 9 and molten steel processing system connection place are sequentially provided with sealing gasket and a 10mm thick steel plate 10, expansion joint 9 is extruded and sealing gasket and steel plate 10 are pressed tightly, so that vacuum pump system and discharging system form a closed system.

[0018] The discharging system includes evacuation valve 1, air valve 2, evacuation pipeline 18, upper plunger stock bin 3, lower plunger stock bin 4, horizontal vibrator 5, aluminum bucket 6, ferrosilicon bucket 7, discharging pipeline 8 and summary pipe, the lower plunger stock bin 4 bottom is provided with horizontal vibrator 5, and the upper portion is connected to evacuation pipeline 18 by pipeline, the pipeline of the upper portion of the lower plunger stock bin 4 is provided with evacuation valve 1 and air valve 2, the horizontal vibrator 5, aluminum bucket 6, ferrosilicon bucket 7 lower portion is connected to summary pipe by discharging pipeline 8, and the summary pipe is connected to expansion joint 9.

[0019] The vacuum pump system includes condenser 19, S1 pump 16 and S2 pump 17, one end of the condenser 19 is connected to evacuation pipeline 18, the other end is connected to S2 pump 17, and the S2 pump 17 is connected to S1 pump 16.

[0020] The molten steel processing system includes alloy baffle box 11, hot top cover 14, vacuum chamber 12, molten steel tank 13 and ash valve 15, one end of the hot top cover 14 covers the top of the vacuum chamber 12, and the other end is connected to ash valve 15 by pipeline, the ash valve 15 is connected to vacuum pump system, the lower end of the vacuum chamber 12 is provided with molten steel tank 13, the vacuum chamber 12 is connected to alloy baffle box 11 by pipeline, and 10mm thick sealing gasket and a 10mm thick steel plate 10 are sequentially arranged between expansion joint 9 and alloy baffle box 11.

[0021] Working principle, including the following steps:

[0022] (1) Test the vacuum pump system: The vacuum pump system, plunger bin and discharge pipeline 8 are provided with vacuum gauges, and the vacuum degree of the vacuum pump system is 0.22 Kpa when the evacuation valve 1 is closed. This value is the basic value of the vacuum pump system, and the subsequent troubleshooting is based on this value. When the value exceeds 0.30 Kpa, the vacuum pump system has a leak, and the condenser 19, evacuation pipeline 18 and evacuation valve 1 are checked for leak points.

[0023] (2) Test the plunger bin: If the vacuum degree of the vacuum pump system is not a problem, open the evacuation valve 1, and also evacuate the upper plunger bin 3 and the lower plunger bin 4. This step can check whether the plunger seal and the bin body are tight, and also check whether the air valve 2 has a leak. The bin can be evacuated with the evacuation pipeline 18, and the bin gauge can reach about 0.40 Kpa. This value indicates that the bin has no leak. At the same time, the bin gauge value can be observed by closing the evacuation valve 1. If the vacuum degree rises by 0.1-0.2 Kpa per minute, it represents a slight leak that can be ignored. If the bin gauge value rises to 20-90 Kpa within 1-5 minutes after the evacuation valve 1 is closed, it means that the plunger seal or the air valve 2 or the bin body has a leak, and these points need to be checked. After checking, if there is no problem, close the evacuation valve 1, open the air valve 2, and restore the normal atmospheric pressure of the bin. Then, test whether the discharge pipeline 8 has a leak.

[0024] (3) Test the discharge pipeline 8: Lift the lower plunger, then open the evacuation valve 1, and also evacuate the discharge pipeline 8. The evacuation of the discharge pipeline 8 can reflect whether the discharge pipeline 8, aluminum bucket 6, silicon-iron bucket 7 and horizontal vibrator 5 have a leak. If the vacuum degree value is very high, reaching 0.5 Kpa or more, it means that the telescopic joint 9, discharge pipeline 8, aluminum bucket 6, silicon-iron bucket 7 and horizontal vibrator 5 have a leak. If the vacuum degree is normal, it means that the discharge system and the pump system are normal, and the molten steel treatment system needs to be checked, focusing on the sealing section, top gun oxygen and gas pipeline, lens air, hot top cover 14 and vacuum chamber 12.

[0025] During the inspection, the telescopic joint is stretched out under the action of the cylinder, and the sealing gasket is pressed against the steel plate 10, so that the vacuum pump system and the discharge system form a closed system. The system can be segmented and detected by opening or closing the evacuation valve 1 and the plunger. It is easy to find out whether there is a leak point in the segmented system. After checking, the specific leak point can be found and repaired in time, which greatly improves the time for finding the leak point of the vacuum system and ensures the smooth production.

[0026] The above examples are implemented on the premise of the technical scheme of the utility model, detailed implementation modes and specific operation processes are given, but the protection scope of the utility model is not limited to the above examples. The methods used in the above examples are all conventional methods if not specially stated.

Claims

1. A RH furnace vacuum system, characterized in that, The system comprises a vacuum pump system, a discharging system and a molten steel treatment system, the vacuum pump system is connected to the discharging system and the molten steel treatment system through pipelines respectively, the discharging system is connected to the molten steel treatment system through a pipeline, a flexible joint is arranged between the pipeline of the discharging system and the molten steel treatment system, a sealing gasket and a steel plate with a thickness of 10-15 mm are arranged in sequence at the connection between the flexible joint and the molten steel treatment system, the sealing gasket and the steel plate are pressed tightly when the flexible joint is extended, so that the vacuum pump system and the discharging system form a closed system.

2. A vacuum system for RH furnace according to claim 1, characterized in that, The discharging system comprises an evacuation valve, an air valve, an evacuation pipeline, an upper plunger bin, a lower plunger bin, a horizontal vibrator, an aluminum bucket, a ferrosilicon bucket, a discharging pipeline and a collecting pipeline, the horizontal vibrator is arranged at the bottom of the lower plunger bin, the upper plunger bin is connected to the evacuation pipeline through a pipeline, the pipeline at the upper plunger bin is provided with the evacuation valve and the air valve, the horizontal vibrator, the aluminum bucket and the ferrosilicon bucket are connected to the collecting pipeline through the discharging pipeline, and the collecting pipeline is connected to the flexible joint.

3. A vacuum system for a RH furnace according to claim 2, characterized in that The vacuum pump system comprises a condenser, an S1 pump and an S2 pump, one end of the condenser is connected to the evacuation pipeline, and the other end is connected to the S2 pump, the S2 pump is connected to the S1 pump.

4. A vacuum system for RH furnace according to claim 1, characterized in that, The molten steel treatment system comprises an alloy baffle box, a hot top cover, a vacuum chamber, a molten steel tank and a dust valve, one end of the hot top cover covers the top of the vacuum chamber, and the other end is connected to the dust valve through a pipeline, the dust valve is connected to the vacuum pump system, the vacuum chamber is provided with the molten steel tank at the lower end, the vacuum chamber is connected to the alloy baffle box through a pipeline, and the sealing gasket and the steel plate are arranged in sequence between the flexible joint and the alloy baffle box.

5. A vacuum system for RH furnace according to claim 1, characterized in that, The sealing gasket is a circular ring-shaped sealing gasket with a thickness of 10-15 mm.

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