Tapping method of walking beam type steel rolling heating furnace

Abstract

The invention relates to the technical field of steel rolling, in particular to a tapping method of a walking beam type steel rolling heating furnace, which comprises the following steps: when a furnace door rises to the middle limit of the furnace door, a tapping machine advances to a blank supporting position, and meanwhile, the furnace door continues to rise to the upper limit of the furnace door; the stepping beam synchronously ascends to the equal-height position of the stepping beam in the ascending process of the furnace door, and the steel billet is supported when the steel discharging machine advances to the billet supporting position; the tapping machine ascends to the upper limit of the tapping machine and begins to retreat, and the stepping beam begins to descend; and after the tapping machine retreats to the rear limit of the tapping machine, the furnace door and the tapping machine descend at the same time until the steel billet is placed on the tapping roller way, and the tapping machine and the furnace door continue to descend to the respective lower limits and stop. The method has the advantages that the waiting time of the tapping machine in a traditional'full-open 'or'half-open' mode is avoided, the opening time of the furnace door is remarkably shortened, the advancing speed of the whole tapping process is increased, the tapping amount of the heating furnace in unit time can be increased, and the steel rolling production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of steel rolling technology, and in particular to a method for tapping steel from a walking beam steel rolling furnace. Background Technology

[0002] The steel rolling heating furnace is one of the core production equipment in a steel rolling mill, and also one of the most energy-intensive. Its main function is to heat steel billets to the temperature required for the rolling process, after which the billets are extracted by the tapping machine and transported to the rolling production line. During the heating process, the furnace not only consumes a large amount of energy, but also causes significant energy waste due to heat loss caused by the opening of the furnace door.

[0003] Specifically, heat loss due to overflow from the furnace door is mainly caused by the following two situations:

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

[0005] During the billet charging and tapping process, opening the furnace door causes high-temperature gases to escape from the furnace, accounting for approximately 2% of the total heat consumption of the furnace. The temperature is even higher on the tapping side, resulting in more severe heat loss.

[0006] 2) Heat loss under accident conditions:

[0007] If a malfunction occurs during the tapping process (such as the tapping machine hitting the billet), causing the furnace door to fail to close in time, the prolonged opening of the furnace door will result in a large loss of heat.

[0008] To compensate for the decrease in furnace temperature caused by heat loss due to overflow from the furnace door, it is usually necessary to increase the gas supply to the heating furnace. This not only increases energy consumption but also reduces the operating efficiency of the heating furnace. Therefore, reducing furnace door opening time, optimizing the steel tapping process, and lowering the accident rate are of great significance for improving the energy efficiency and production stability of the heating furnace.

[0009] Traditional tapping methods mainly include two modes: tapping with the furnace door fully open and tapping with the furnace door partially open, but both have obvious drawbacks:

[0010] 1) Steel tapping with the furnace door fully open:

[0011] The tapping machine only starts operating after the furnace door is fully opened, resulting in a long opening time and significant heat loss.

[0012] 2) Steel tapping with the furnace door half-open:

[0013] After the furnace door rises to the middle position, it pauses and the tapping machine starts to operate. However, the suspended furnace door can easily cause instability in the hydraulic system, which may lead to an accident where the furnace door slides down and hits the tapping machine. At the same time, it is not conducive to the operator observing the situation inside the furnace. Summary of the Invention

[0014] The purpose of this invention is to provide a steel tapping method for a walking beam steel rolling furnace. By optimizing the coordinated operation of the furnace door, tapping machine and walking beam, the furnace door opening time is reduced, heat loss is decreased, and steel tapping accidents are effectively avoided.

[0015] To achieve the above objectives, the present invention provides the following technical solution:

[0016] A method for tapping steel from a walking beam steel rolling furnace, which optimizes the timing of the furnace door, tapping machine, and walking beam, specifically includes the following steps:

[0017] After receiving the steel demand signal from the rolling mill, the furnace door begins to rise. When the furnace door rises to the middle limit of the furnace door, the steel tapping machine moves forward to the billet support position, and at the same time the furnace door continues to rise until the upper limit of the furnace door.

[0018] The walking beam rises synchronously to the same height position as the furnace door during the rising process, and lifts the billet when the tapping machine advances to the billet support position;

[0019] The steel tapping machine rises to its upper limit and begins to retreat, while the walking beam begins to descend.

[0020] After the tapping machine retracts to its rear limit, the furnace door and the tapping machine descend simultaneously until the steel billet is placed on the tapping roller conveyor. The tapping machine and the furnace door then continue to descend to their respective lower limits and stop.

[0021] Complete the steel tapping process.

[0022] The center limit height of the furnace door is located at any position between the lower limit of the tapping machine and the upper limit of the furnace door, preferably between -100mm and +100mm of the roller conveyor elevation.

[0023] The maximum height of the furnace door center position is -100mm, -50mm, 0 or 50mm.

[0024] Compared with the prior art, the present invention 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, while the furnace door continues to rise. This avoids the waiting time of the tapping machine in the traditional "fully open" or "half open" mode, significantly shortens the furnace door opening time, speeds up the progress of the entire tapping process, and thus increases the amount of steel tapped per unit time in the heating furnace, thereby improving the efficiency of steel rolling production.

[0026] 2. Reduce the risk of billet collision during steel tapping: When the furnace door rises, the walking beam rises synchronously to the same height as the walking beam to support the billet. This can lift most of the billets that may collapse due to deformation, thus avoiding collision between the tapping machine and the billet when the billet is being pulled out. This ensures the stable operation of the tapping machine and related equipment, and reduces downtime and maintenance time and costs 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 Implementation

[0037] Example 1:

[0038] A method for tapping steel from a walking beam steel rolling furnace, which optimizes the timing of the furnace door, tapping machine, and walking beam, specifically includes the following steps:

[0039] Step S1, Steel tapping preparation stage:

[0040] After receiving the steel demand signal from the rolling mill, the furnace door 7 begins to rise.

[0041] Step S2, Synchronization Operation Phase:

[0042] When the furnace door 7 rises to the middle limit 12, the tapping machine advances to the billet support position 5, and at the same time the furnace door 7 continues to rise until the upper limit 19.

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

[0044] Flexible setting of furnace door center limit 12 height: The furnace door center limit 12 height can be set at any position between the lower limit 13 of the tapping machine and the upper limit 19 of the furnace door. Generally, it is selected between -100mm and +100mm of the roller conveyor 10 elevation. The furnace door center limit 12 height is -100mm, -50mm, 0 or 50mm, and the furnace door center limit 12 height is -50mm.

[0045] Step S3, Steel tapping execution stage:

[0046] When the steel tapping machine advances to the billet support position 5, it lifts the billet.

[0047] The walking beam 1 stops at the walking beam level 17, which is ±0mm. The furnace door 7 is suspended at the upper limit 19 of the furnace door. The tapping machine rises to the upper limit 16 of the tapping machine and begins to move backward. The walking beam 1 begins to descend.

[0048] Step S4, Reset Phase:

[0049] After the tapping machine retracts to its rear limit 8, the furnace door 7 and the tapping machine descend simultaneously until the billet is placed on the tapping roller conveyor 10. The tapping machine and the furnace door 7 then continue to descend to their respective lower limits and stop.

[0050] Complete the steel tapping process.

[0051] According to actual measurements by operators, the opening time of furnace door 7 was reduced from 12 seconds to 8 seconds, and gas consumption was reduced by 1.5%.

[0052] All heights involved are based on the roller conveyor elevation 10 as ±0.

[0053] Example 2:

[0054] In this embodiment, the steel tapping method of a walking beam type 1 steel rolling heating furnace is the same as that in Embodiment 1, but an additional steel tapping process of the walking beam type 1 steel rolling heating furnace is added.

[0055] See Figures 1-3 The diagram illustrates the relative positions of the steel tapping machine support rod 20, furnace door 7, walking beam 1, slab 4, and other related equipment and materials in the steel tapping area.

[0056] Figure 4 This indicates the operation of the furnace door 7 during 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. During the tapping process, the furnace door 7 rises from the lower limit 11 to the middle limit 12, and the tapping machine begins to move forward. The furnace door 7 continues to rise until it hovers at the upper limit 19. When the tapping machine retreats to the rear limit 8, the furnace door 7 begins to descend and stops at the lower limit 11.

[0057] Figure 5 This indicates the entire steel tapping process of the tapping machine. When the furnace door 7 rises to the furnace door center limit 12, the tapping machine begins to move forward. When it reaches the billet support position 5, the tapping machine rises. When it rises to the upper limit 16 of the tapping machine, it lifts the billet 4 and moves back to the rear limit 8 of the tapping machine, then lowers it and places the billet 4 onto the discharge roller conveyor 10, thus completing the steel tapping process.

[0058] Figure 6 This indicates the movement of the walking beam 1 during the tapping process. When the furnace door 7 begins to rise, the walking beam 1 rises to the same height position 17 to support the slab 4. When the tapping machine lifts the slab 4 and begins to retreat, the walking beam 1 descends to the lower limit 14 of the walking beam.

[0059] This invention optimizes the coordinated action of the furnace door and the tapping machine. The tapping machine starts when the furnace door reaches its mid-position limit, while the furnace door continues to rise. This avoids the waiting time of the tapping machine in traditional "fully open" or "half open" modes, significantly shortening the furnace door opening time and accelerating the entire tapping process. This increases the steel output per unit time in the heating furnace, improving the efficiency of steel rolling production. It also reduces the risk of billet collisions during tapping: the walking beam rises synchronously to its height level with the furnace door, supporting the billet. This lifts most billets that may collapse due to deformation, preventing collisions between the tapping machine and the billet during extraction. This ensures stable operation of the tapping machine and related equipment, reducing downtime and maintenance costs due to equipment failure. Furthermore, the furnace door does not hover at its mid-position limit, thus avoiding hydraulic pressure during tapping. While preventing the furnace door from sliding down and hitting the tapping machine, this invention also allows operators to more clearly observe the position of the tapping machine entering the furnace, facilitating precise control of the tapping process, improving operational reliability and safety, and reducing the risk of human error. 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, improving the applicability of the method. Reducing the furnace door opening time effectively lowers heat loss due to heat leakage. In traditional tapping methods, the furnace door opening time is long, resulting in a large amount of heat escaping from the door. This invention, by optimizing the coordinated action of the tapping machine and the furnace door, shortens the furnace door opening time, thereby reducing heat leakage and minimizing the additional consumption of gas and other energy due to heat loss, thus helping to improve the energy utilization efficiency of the heating furnace.

Claims

1. A method for tapping steel from a walking beam steel rolling furnace, characterized in that, The optimization of the timing of the furnace door, tapping machine, and walking beam involves the following steps: After receiving the steel demand signal from the rolling mill, the furnace door begins to rise. When the furnace door rises to the middle limit of the furnace door, the steel tapping machine moves forward to the billet support position, and at the same time the furnace door continues to rise until the upper limit of the furnace door. The walking beam rises synchronously to the same height position as the furnace door during the rising process, and lifts the billet when the tapping machine advances to the billet support position; The steel tapping machine rises to its upper limit and begins to retreat, while the walking beam begins to descend. After the tapping machine retracts to its rear limit, the furnace door and the tapping machine descend simultaneously until the steel billet is placed on the tapping roller conveyor. The tapping machine and the furnace door then continue to descend to their respective lower limits and stop. Complete the steel tapping process.

2. The tapping method of a walking beam steel rolling furnace according to claim 1, characterized in that, The furnace door center limit height is located at any position between the lower limit of the tapping machine and the upper limit of the furnace door, preferably between -100mm and +100mm of the roller conveyor elevation.

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

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