Skip to content
LMM Group

Performance and structural analysis of 7.63m coke oven door

Performance and structural analysis of 7.63m coke oven door

TISCO’s 7.63m coke oven is a large coke oven imported from abroad. The knife edge of the coke oven door has a Z-shaped structure. During use of the oven door, flue gas leakage in the oven is easy to occur. In response to this situation, we improved the design of the original coke oven door and trial-produced 2 sets of coke oven doors suitable for TISCO’s 7.63m coke oven. After nearly one year of use and comparison with the original oven door, the new coke oven door has obvious advantages in terms of structure and performance.

Coke oven door structure and characteristics

The structure of the new 7.63m coke oven door mainly has the following features:

1) The sealing knife edge adopts the overall structure of knife edge web plate. The original 7.63m coke oven door blade is a stainless steel Z-shaped blade. Its connection with the cast iron door body is inlaid and hot-fitted. The blade edge is pressed to the surroundings of the coke oven door body through a spring support.

During the use of the coke oven, the temperature of the body and the knife edge is about 200°C. Since the knife edge is made of stainless steel and the coke oven door body is made of cast iron, the thermal expansion coefficients of the two materials are quite different. At 200℃, the linear expansion coefficient of cast iron is about 8.5~11.6×10-6mm/℃, while the linear expansion coefficient of stainless steel is about 17×10-6mm/℃. The length of the coke oven door body is 7755mm, so the minimum thermal expansion difference is 7755×200×(17-11.6)×10-6=8.4mm. That is, the difference in expansion in the length direction between the coke oven door and the knife edge is about 9mm at 200°C, causing a gap to appear between the knife edge and the coke oven door body, causing the leakage of flue gas and tar in the furnace. The original coke oven door structure is shown in Figure 1.

Figure 1 Assembly cross-section of the original 7.63m coke oven door

After the coke oven door is used for a period of time, the coke oven door frame will undergo thermal deformation, and the coke oven door knife edge needs to be adjusted so that the knife edge adapts to the deformation of the coke oven door frame. However, the adjustment screw of the original 7.63m coke oven door spring adjusts the knife edge by about 5mm, which is difficult to fully meet the knife edge adjustment requirements.

The sealing knife edge of the new 7.63m coke oven door adopts a knife-edge web-type integral structure, which overcomes the leakage caused by the different materials of the knife-edge web and the oven door body. The new furnace door structure is shown in Figure 2.

Figure 2 Sectional view of the new 7.63m coke oven door

2) Add the overall adjustment mechanism of the skateboard. This mechanism mainly has the following two functions: First, it eliminates the alternating deformation of the coke oven door knife edge web under working conditions. The second is to adjust the sealing of the coke oven door knife edge from a simple pressure spring adjustment to first adjusting the fit between the sliding plate and the coke oven door through a newly added adjustment mechanism. Then use the pressure spring around the knife edge to adjust the close contact between the knife edge and the coke oven door, thereby greatly improving the sealing performance. The new 7.63m coke oven door structure adopts an integral knife-edge web. By adding the overall adjustment mechanism of the sliding plate, the knife edge web and the coke oven door body float mutually. During the use of the coke oven door, the knife edge web does not deform, which improves the stress state of the knife edge web. This can increase the sealing performance and service life of the knife edge web.

3) Improve the coke oven door top pressure seat structure. The spring support of the original 7.63m coke oven door is fastened to the oven door body through bolts, while the pressing seat of the new structure 7.63m oven door is integrated with the oven door body, which reduces a lot of spring support assembly work. . At the same time, the adjustment amount of the push seat screw plug to the knife edge spring is increased from 5mm to about 25mm.

The spring support of the original 7.63m coke oven door is fastened to the oven door body through bolts. During the use of the oven door, a large amount of daily adjustment and maintenance work is required on the oven door spring support. The pressing seat of the new 7.63m furnace door is integrated with the coke oven door body, which greatly reduces the daily adjustment and maintenance workload of the pressing seat.

4) The knife edge of the small coke oven door adopts an integral knife edge web. After the knife edge of the small coke oven door adopts an integral knife edge web, the sealing performance of the knife edge is greatly improved, the workload of on-site installation and replacement of the knife edge of the small coke oven door is reduced, and the operation is simple.

Furnace door performance

The use of the TISCO 7.63m coke oven shows that the improved coke oven door knife edge web has good sealing performance and is interchangeable with the original coke oven door. The new 7.63m coke oven door is fully applicable to the working requirements of the existing coke oven coke pusher and coke blocker. The new coke oven door has been proven on-site by Taiyuan Iron & Steel Co., Ltd.’s 7.63m coke oven, and all indicators meet the performance parameter requirements.

Conclusion

After careful research on the 7.63m coke oven door structure, Sinosteel Xingji Equipment Co., Ltd. designed and manufactured a new type of coke oven door with design improvements and optimizations in many aspects. The improved 7.63m coke oven door has significant effects in improving the sealing performance of the oven door and increasing the service life of the knife edge web.

Coking Equipment Manufacturer
coke ovens
coke oven door

Leave a Reply

Your email address will not be published. Required fields are marked *

Contact Us