Discussion on overhaul of refractory structure of dry coke quenching device

Yes, the design generally does not require overhaul once a year, but due to various reasons, maintenance is basically required. Problems often occur with the refractory bricks of the ramp support beams.

Overhaul has a specialized construction team such as Wuye Metallurgical Engineering Co., Ltd.

Based on the actual operation of the CDQ system for many years, I think the annual maintenance cycle of CDQ is 1.5 to 2 years, which is more scientific. Among them, 2 to 3 short-stop maintenance periods are arranged to deal with defects that affect the CDQ system (including replacement of wire ropes).

The overhaul time of dry coke quenching after 340 days of operation is about 20-25 days. It should be noted that if there is no problem with dry coke quenching, then it is a serious problem. Therefore, generally speaking, the annual maintenance of dry coke quenching is basically over-repair, that is, replacement of all the coke regardless of whether it is broken or not is about 1.5 million.

I agree with the 4th floor that the current dry quenching system is generally overhauled every two years. Of course, regular maintenance is indispensable. However, the 5th floor is also right. The dry quenching device cannot afford accidents, so when building the furnace, we must pay attention to quality control, and strengthen employee training to control the smooth operation of the device to avoid accidents.

The service life of the refractory lining of the dry quenching furnace is the key to the long-term operation of the dry quenching system. Only by solving the problem in the design structure can a breakthrough be achieved.

When the dry coke quenching device was first introduced to China, it was generally overhauled once a year. The main overhaul was on the furnace body. With the improvement of domestic refractory materials, it is now generally overhauled once every 1.5 years. For dry coke quenching devices, each overhaul is a rare opportunity to comprehensively maintain the system. Therefore, a reasonable maintenance plan must be formulated based on daily operation conditions, and arrangements must be comprehensively considered based on the availability of accessories. Other manufacturers' overhaul plans are not suitable for different manufacturers. If you want to refer to it, you can refer to reference books such as "Inspection and Maintenance of Dry Coke Oven" and "Operation and Maintenance of Dry Coke Equipment". Double chute technology is SPCO's patented technology. The patent fee for each device of this technology is probably more than 3 million. However, the domestic Sino-Japanese Federation is also promoting its own double chute technology. The biggest difference between Sino-Japanese Federation and SPCO is that Sino-Japanese Federation uses stainless steel products, while SPCO uses double ramps made of refractory materials. Different dry quenching furnaces are designed based on air flow distribution, production capacity, etc. There may not be many old dry quenching furnaces converted into double chute in China, so you can consult the design department. According to an authoritative domestic design institute, dry quenching furnaces above 160 tons use double chute technology, and the use of double chute technology for the following ones has little significance. It seems to be related to air flow velocity, flow rate, etc.

The current situation is that many companies have used 120~160t/h dry coke quenching machines for many years. Most of the problems are that the refractory structure has a too short service life. Many companies want to change the refractory structure to a double chute structure during overhaul!

This is possible. It is no problem to redesign the dry quenching furnace and use double chute technology. It is best to count the number of 120-160 dry quenching coke reused in China and how many coke suspensions appear. Personally, I think the most critical issue with dry quenching furnaces is the refractory materials. For example, Japanese refractory materials can guarantee no problems for 5 years, but this is not possible in China now, but the price is also much different.

The problem is that the transformation does not change the CDQ furnace shell, but only modifies the refractory structure. This needs to be demonstrated! Also, by the way, could you please tell me which domestic companies use CDQ refractory materials imported from Japan and have a service life of more than 5 years? Thanks!

Nowadays, the use of dry coke quenching is closely related to the operating environment. Currently, according to the operation conditions of various dry coke quenchings, some have major repairs in less than half a year, and some have minor repairs after 3 years of operation. It is recommended that the boiler needs to be shut down for maintenance in 1.5 to 2 years. It can also be decided based on the analysis of the operating conditions. However, the reality depends a lot on market conditions. Technicians working on dry coke quenching believe that the boiler needs to be shut down for maintenance, but unit leaders often consider many factors before deciding to delay maintenance. The consequence of delay is that a minor problem turns into a major one.