A method for tapping a walking beam type steel rolling heating furnace

Abstract

The present application relates to the field of steel rolling technology, and particularly relates to a steel tapping method of a walking beam type steel rolling heating furnace, when a furnace door is lifted to a middle limit of the furnace door, a steel tapping machine advances to a billet supporting position, and meanwhile the furnace door continues to be lifted until the furnace door reaches an upper limit; a walking beam is synchronously lifted to a walking beam equal height position in the process of lifting the furnace door, and when the steel tapping machine advances to the billet supporting position, the billet is supported; the steel tapping machine is lifted to an upper limit of the steel tapping machine and starts to retreat, and the walking beam starts to descend; after the steel tapping machine retreats to a rear limit of the steel tapping machine, the furnace door and the steel tapping machine simultaneously descend until the billet is placed on a steel tapping roller way, and the steel tapping machine and the furnace door continue to descend to respective lower limits and stop. The present application has the advantages that: the waiting time of the steel tapping machine in the traditional 'full opening' or 'half opening' mode is avoided, the furnace door opening time is significantly shortened, the advancing speed of the whole steel tapping process is accelerated, and then the steel tapping amount per unit time of the heating furnace can be improved, and the efficiency of the steel rolling production is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel rolling, in particular to a steel tapping method of a walking beam type steel rolling heating furnace. BACKGROUND

[0002] The steel rolling heating furnace is one of the core production equipment of the steel rolling plant and also one of the equipment with the largest energy consumption. Its main function is to heat the billet to a temperature meeting the requirements of the rolling process, and then the billet is extracted by the billet extractor and delivered to the rolling production line. During the heating process, the heating furnace not only consumes a large amount of energy, but also causes significant energy waste due to heat overflow caused by the opening of the furnace door.

[0003] Specifically, the furnace door overflow heat loss is mainly caused by the following two cases:

[0004] 1) Heat loss in normal steel tapping process:

[0005] During the billet loading and tapping process, the opening of the furnace door will cause the overflow of high-temperature gas in the furnace, which accounts for about 2% of the total furnace heat consumption. Among them, the temperature on the tapping side is higher and the heat loss is more serious.

[0006] 2) Heat loss in accident state:

[0007] If a failure occurs during the tapping process (such as billet collision of the billet extractor), the furnace door cannot be closed in time, and the long-time opening of the furnace door will cause a large amount of heat loss.

[0008] In order to make up for the reduction of the furnace temperature caused by the furnace door overflow heat loss, it is usually necessary to increase the supply of gas to the heating furnace, which not only increases the energy consumption but also reduces the operating efficiency of the heating furnace. Therefore, how to reduce the opening time of the furnace door, optimize the tapping process and reduce the accident rate is of great significance to improve the energy efficiency and production stability of the heating furnace.

[0009] The traditional tapping methods mainly include two modes of full opening of the furnace door and half opening of the furnace door, but both have obvious defects:

[0010] 1) Full opening of the furnace door:

[0011] The billet extractor starts to act only after the furnace door is completely opened, the furnace door opening time is long, and the heat loss is serious.

[0012] 2) Half opening of the furnace door:

[0013] The furnace door is suspended at the middle position of the furnace door after rising, and the billet extractor starts to act, but the suspension of the furnace door is easy to cause instability of the hydraulic system, which may cause the accident of the furnace door sliding and hitting the billet extractor, and is not conducive to the observation of the furnace by the operator. SUMMARY

[0014] The application aims to provide a tapping method of a walking beam type steel rolling heating furnace, which reduces the opening time of a furnace door, reduces heat loss, and effectively avoids tapping accidents by optimizing the coordinated action of the furnace door, a tapping machine and a walking beam.

[0015] To achieve the above-mentioned purpose, the application is implemented by the following technical solutions.

[0016] A tapping method of a walking beam type steel rolling heating furnace, which optimizes the action time sequence of a furnace door, a tapping machine and a walking beam, and specifically includes the following steps.

[0017] After the heating furnace receives a signal of a rolling mill requiring steel, the furnace door starts to rise, and when the furnace door rises to a middle limit of the furnace door, the tapping machine advances to a billet supporting position, and meanwhile the furnace door continues to rise until the upper limit of the furnace door is reached.

[0018] The walking beam rises to a walking beam equal height position synchronously in the process of the furnace door rising, and when the tapping machine advances to the billet supporting position, the billet is supported.

[0019] The tapping machine rises to the upper limit of the tapping machine and starts to retreat, and the walking beam starts to descend.

[0020] After the tapping machine retreats to the lower limit of the tapping machine, the furnace door and the tapping machine simultaneously descend until the billet is placed on a tapping roller way, and then the tapping machine and the furnace door continue to descend to the lower limit of each to stop.

[0021] The tapping process is completed.

[0022] The middle limit height of the furnace door is located between the lower limit of the tapping machine and the upper limit of the furnace door, and is preferably between the roller way elevation-100mm and +100mm.

[0023] The middle limit height of the furnace door is-100mm, -50mm, 0 or 50mm.

[0024] Compared with the prior art, the application has the following beneficial effects:

[0025] 1. By optimizing the coordinated action of the furnace door and the tapping machine, the tapping machine is started when the furnace door rises to the middle limit of the furnace door, and meanwhile the furnace door continues to rise, which avoids the waiting time of the tapping machine in the traditional "full opening" or "half opening" mode, significantly shortens the opening time of the furnace door, accelerates the advancing speed of the whole tapping process, and further improves the tapping amount of the heating furnace per unit time and the efficiency of the steel rolling production.

[0026] 2. Reduces the risk of billet collision during tapping: the walking beam rises to the walking beam equal height position synchronously when the furnace door rises to support the billet, which can support most of the billets that may appear to have a collapsed waist and head due to deformation, avoids the collision between the tapping machine and the billet when the tapping machine extracts the billet, ensures the stable operation of the tapping machine and related equipment, and reduces the downtime and cost caused by equipment failure.

[0027] 3. The furnace door is not suspended at the extreme limit in the middle position. On the one hand, this can avoid the accident of the hydraulic furnace door sliding down and hitting the tapping machine during the tapping process. On the other hand, it can help the operator to observe the position of the tapping machine entering the furnace more clearly, so as to facilitate the operator to accurately control the tapping process, improve the reliability and safety of operation, and reduce the risk of human error.

[0028] 4. The center limit height of the furnace door can be flexibly adjusted according to actual production needs (such as -100mm, 0, +50mm, etc.) to adapt to different billet specifications and process requirements, and improve the applicability of the method.

[0029] 5. Reduce furnace door opening time and effectively reduce heat loss from furnace door overflow. In traditional steel tapping methods, the furnace door opening time is relatively long, and a large amount of heat energy escapes from the furnace door. However, this invention shortens the furnace door opening time by optimizing the coordinated action of the tapping machine and the furnace door, thereby reducing heat energy overflow and reducing the extra consumption of energy such as gas due to heat loss, which helps to improve the energy utilization efficiency of the heating furnace. Attached Figure Description

[0030] Figure 1 This is a schematic diagram showing the location of the tapping area in a walking beam steel rolling furnace.

[0031] Figure 2 This is a schematic diagram showing the location of the tapping area in a walking beam steel rolling furnace.

[0032] Figure 3 This is a schematic diagram showing the location of the tapping area in a walking beam steel rolling furnace.

[0033] Figure 4 This is a schematic diagram of the lifting and limit positions of the furnace door of a walking beam steel rolling heating furnace.

[0034] Figure 5 This is a schematic diagram of the tapping machine operation of a walking beam steel rolling furnace.

[0035] Figure 6 This is a schematic diagram of the walking beam movement during the tapping process of a walking beam steel rolling furnace.

[0036] In the diagram: 1. Walking beam; 2. Heating furnace side wall; 3. Fixed beam; 4. Slab; 5. Slab support position; 6. Slab centerline; 7. Furnace door; 8. Rear limit of tapping machine; 9. Centerline of discharge roller conveyor; 10. Roller conveyor; 11. Lower limit of furnace door; 12. Mid-position limit of furnace door; 13. Lower limit of tapping machine; 14. Lower limit of walking beam; 15. Elevation of fixed beam; 16. Upper limit of tapping machine; 17. Elevation of walking beam; 18. Tapping machine stroke; 19. Upper limit of furnace door; 20. Tapping machine support rod; 21. Discharge end wall; 22. Water tank for discharge. DETAILED DESCRIPTION

[0037] Example 1

[0038] A method for tapping a walking beam type steel rolling heating furnace, by optimizing the action time sequence of the furnace door, the taphole and the walking beam, specifically comprising the following steps:

[0039] Step S1, tapping preparation stage:

[0040] After the heating furnace receives the signal of the rolling mill requiring steel, the furnace door 7 starts to rise.

[0041] Step S2, synchronous operation stage:

[0042] When the furnace door 7 rises to the furnace door middle limit 12, the taphole advances to the billet supporting position 5, and at the same time, the furnace door 7 continues to rise until the furnace door upper limit 19;

[0043] The walking beam 1 rises to the walking beam equal height position 17 during the rising of the furnace door 7.

[0044] Flexible setting of the height of the furnace door middle limit 12: the height of the furnace door middle limit 12 can be set at any position between the equal height position of the taphole lower limit 13 and the furnace door upper limit 19, generally between -100mm and +100mm of the level of the roller 10, the height of the furnace door middle limit 12 is -100mm, -50mm, 0 or 50mm, and the height of the furnace door middle limit 12 is -50mm.

[0045] Step S3, tapping execution stage:

[0046] When the taphole advances to the billet supporting position 5 to support the billet;

[0047] The walking beam 1 stops at the walking beam equal height position 17, the walking beam equal height position 17 is ±0mm, the furnace door 7 hovers at the furnace door upper limit 19 position, the taphole rises to the taphole upper limit 16 and starts to retreat, and the walking beam 1 starts to descend.

[0048] Step S4, reset stage:

[0049] After the taphole retreats to the taphole rear limit 8, the furnace door 7 and the taphole descend at the same time until the billet is placed on the tapping roller 10, and the taphole and the furnace door 7 continue to descend to the respective lower limits and stop;

[0050] The tapping process is completed.

[0051] According to the actual measurement by the operator, the opening time of the furnace door 7 is shortened from 12 seconds to 8 seconds, and the gas consumption is reduced by 1.5%.

[0052] The heights involved are all ±0 of the level of the roller 10.

[0053] Example 2:

[0054] In this embodiment, the tapping method of the walking beam 1 type steel rolling heating furnace is the same as that of example 1, and on the basis thereof, a tapping process of the walking beam 1 type steel rolling heating furnace is added.

[0055] See Figures 1-3 The relative positions of the related equipment and materials such as the tundish 20 of the tapping machine, the furnace door 7, the walking beam 1, and the position of the slab 4 are schematically shown.

[0056] Figure 4 The process of the operation of the furnace door 7 in the tapping process and the corresponding positions of the lower limit 11, the middle limit 12, and the upper limit 19 of the furnace door 7 are shown. In the tapping process, the furnace door 7 is raised from the lower limit 11 of the furnace door 7 to the middle limit 12 of the furnace door 7, the tapping machine starts to advance, the furnace door 7 continues to rise to the upper limit 19 of the furnace door 7 to hover, when the tapping machine retreats to the rear limit 8 of the tapping machine, the furnace door 7 starts to descend and stops at the position of the lower limit 11 of the furnace door 7.

[0057] Figure 5 The whole tapping process of the tapping machine is shown. When the furnace door 7 is raised to the middle limit 12 of the furnace door 7, the tapping machine starts to advance, and when it reaches the tundish position 5, the tapping machine is raised, and when it reaches the upper limit 16 of the tapping machine, the slab 4 is lifted and retreated to the rear limit 8 of the tapping machine to be lowered, and the slab 4 is placed on the discharge roller 10 to complete the tapping.

[0058] Figure 6 The action process of the walking beam 1 in the tapping process is shown. When the furnace door 7 starts to rise, the walking beam 1 is raised to the walking beam equal height position 17 to support the slab 4, and when the tapping machine starts to retreat with the slab 4 lifted, the walking beam 1 is lowered to the lower limit 14 of the walking beam.

[0059] The present application optimizes the coordinated action of the furnace door and the tundish, starts the tundish when the furnace door rises to the middle limit of the furnace door, and continues to rise, avoids the waiting time of the tundish in the traditional "full open" or "half open" mode, significantly shortens the opening time of the furnace door, speeds up the whole tundish process, and further improves the tundish quantity per unit time of the heating furnace and the efficiency of the rolling production; reduces the risk of tundish collision: the walking beam rises to the walking beam level position when the furnace door rises, holds the steel billet, lifts most of the steel billet that may collapse due to deformation, avoids the collision between the tundish and the steel billet when the tundish pulls out the steel billet, ensures the stable operation of the tundish and related equipment, reduces the downtime and cost caused by equipment failure; the furnace door does not hover at the middle limit of the furnace door, which can avoid the accident of the hydraulic furnace door sliding down and colliding with the tundish during tundish, and is conducive to the operator to observe the position of the tundish entering the furnace more clearly, facilitates the accurate control of the tundish process by the operator, improves the reliability and safety of the operation, and reduces the risk caused by human error; the middle limit height of the furnace door can be flexibly adjusted according to the actual production demand (such as-100mm, 0, +50mm, etc.), to adapt to different steel billet specifications and process requirements, improve the applicability of the method; reduce the opening time of the furnace door, effectively reduce the heat loss of the furnace door overflow, in the traditional tundish mode, the furnace door opening time is long, a large amount of heat energy escapes from the furnace door, and the present application optimizes the coordinated action of the tundish and the furnace door, shortens the opening time of the furnace door, thereby reducing the heat energy overflow, reducing the additional consumption of energy such as coal gas caused by heat loss, and helping to improve the energy utilization efficiency of the heating furnace.

Claims

1. A method of tapping a walking beam steel rolling heating furnace, characterized in that, By optimizing the action time sequence of the furnace door, the tundish and the walking beam, the method comprises the following steps: After the heating furnace receives the signal of the rolling mill requiring steel, the furnace door starts to rise, and when the furnace door rises to the middle limit of the furnace door, the tundish advances to the billet supporting position, and meanwhile the furnace door continues to rise until the upper limit of the furnace door is reached; The walking beam rises to the equal height position of the walking beam synchronously during the rising of the furnace door, and when the tundish advances to the billet supporting position, the billet is supported by the tundish; The tundish rises to the upper limit of the tundish and starts to retreat, and the walking beam starts to descend; After the tundish retreats to the lower limit of the tundish, the furnace door and the tundish descend simultaneously until the billet is placed on the steel outlet roller way, and then the tundish and the furnace door continue to descend to the lower limit of each and stop; The outsteeling process is completed.

2. A method of tapping a walking beam steel rolling furnace according to claim 1, characterized in that, The middle limit height of the furnace door is located between the lower limit of the tundish and the upper limit of the furnace door, and the height of the roller way is between-100mm and +100mm.

3. A method of tapping a walking beam steel rolling furnace according to claim 2, characterized in that, The middle limit height of the furnace door is-100mm, -50mm, 0 or 50mm.

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