【Weekly Topic】Everyone please discuss the existing problems and solutions in their own coke dry quenching operations (February 14 to February 20, 2011)
Thread Content
This post was last edited by Desert Poplar on 2011-2-16 at 20:11. This topic has been reviewed by the moderators; my forum has chosen it as this week’s topic, so I encourage everyone to participate actively. All participants will receive a reward, with big prizes for those who answer well! & F2 U+ K- _6 Nowadays, more and more coking plants are adopting dry quenching of coke, which not only helps to save energy and reduce emissions but also improves the quality of coke – achieving two benefits at once. However, many problems arise in actual operation; colleagues might as well share the issues encountered in their own plants as well as the measures taken to address them.
The key to dry quenching of coke lies in the maintenance of equipment; the parts where problems are likely to occur are mainly the lifting device and the charging device
The particle size of dry quenched coke is significantly smaller than that of wet quenched coke. I wonder if anyone else faces this issue?
Many coking plants have now adopted dry quenching of coke. Since the adoption of this technology in our plant, it has not only improved the quality of coke and allowed more sensible heat to be recovered for use in boiler power generation, but more importantly, it has helped reduce environmental pollution. But there are also quite a few problems. The boiler inlet temperature is too high, and large temperature differences often occur in the four directions at the same temperature measurement point in the cooling chamber. The coke discharge temperature is too high, and floating coke occurs from time to time. Based on the conditions at the site and my personal work experience, it is likely that there is some blockage in the furnace’s annular gas passage. Another possible scenario is that the coke oven is operating under overload; sometimes, the standard temperature of the coke oven is too high, or issues such as unripe coke can also affect dry quenching of coke. I’ve not been in this industry for long, so if there are any misunderstandings, I hope everyone can point them out for me. I also invite everyone to share their thoughts on dry quenching of coke.
Reply to 3# Dopoda: That’s indeed the case. During the dry quenching process, the relative movement of the material layer increases the friction and collisions between coke pieces, causing cracks in larger coke pieces to open up earlier. This helps to improve the uniformity of the coke pieces.
The main issue is the high coking temperature; the temperatures at the four points in the cooling section vary greatly, with the highest values exceeding 600 and the lowest around 100
Reply to 4# wust: Hey brother, which school are you from? I’m quite familiar with WUST, haha. Our dust removal system has been in use for a long time, and its efficiency is poor; it’s practically impossible to enter the coke discharge basement. Moreover, the dust removal, humidification, and mixing functions of the equipment aren’t effective, which leads to secondary dust generation. The worst part is that the drag cables of our elevators are of the traditional friction type, and due to sudden changes in weather, the chain plates tend to crack easily. If this isn’t detected in time, it can lead to serious accidents. In the half year since I arrived here, there have already been two such incidents... Ugh, it’s frustrating
It's mainly a problem with the equipment (lifting mechanism, alignment, and coke discharge)
Dry quenching of coke is also a continuous process; the rhythm of coke loading and the rhythm of coke removal are each influenced by the coke oven and the blast furnace
Reply to 7# megatron747: Are you from Wuhan University of Science and Technology? I graduated from the coal chemical engineering program in 2007. What about you?
Our problem is that the pressure in the pre-storage section fluctuates greatly when loading coke, by 500 Pa either way. Does anyone else experience this issue? How was it solved?