Comparison of reaction nozzles
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Currently, there are three types of nozzles used in catalysis: the BTW type, which was jointly developed by the Beijing Research Institute, Jingmen Petrochemical, and Northwestern Polytechnical University； The CS type was developed by Luoyang Institute ； KH type was developed by the Beijing Institute of Mechanics. Our company replaced the KH-type nozzles with CS-type ones in 2005, but the performance was not satisfactory – they had poor wear resistance and required a large amount of steam. In the same year, we switched back to KH-type nozzles. I’m curious about the differences among these three types of nozzles in terms of atomization efficiency, steam consumption, and product distribution Please offer many opinions.
Service life of catalytic cracking nozzles: http://bbs.hcbbs.com/viewthread.php?tid=313413 Changes to the feed material after it enters the nozzles in a catalytic cracking unit: http://bbs.hcbbs.com/viewthread.php?tid=372657 What is the optimal temperature of the feed material at the lift pipe nozzles in a catalytic cracking unit during normal operation? http://bbs.hcbbs.com/viewthread.php?tid=371593 Recent developments in nozzle technology http://bbs.hcbbs.com/viewthread.php?tid=431776
Could you tell me which company it is? How is the wear? Is it the case with air curtain holes, from Qianjiang, Hubei?
Regarding the performance of nozzles, well-designed nozzles can generally be used for three years without any problems, with minimal wear; however, their useful life extends at most to two cycles. KH nozzles offer good performance, resulting in proper coking and product distribution, with a steam percentage ranging between 3% and 5%.
We’re using CS right now; it works very well. The old catalysts have been replaced. The newly built FDFCC units are designed with KH, but the workshop requires CS
We’re using CS; it feels good. I used it for two years; it was almost worn out, so I replaced it – it’s still from CS
Our company has used various types of nozzles, and after comparison we ultimately chose the KH type nozzle from the Beijing Institute of Mechanics. It performs well; the institute designed it based on the data we provided, which made it suitable for our needs. It offers great operational flexibility, results in less vaporization – by 1-2% compared to previous models – and produces less coking. The overall liquid yield has increased by 1.5% compared to before. This nozzle has been in use for nearly three years, and during the most recent inspection, it was found to be in good condition.
After more than two decades of research and development, catalytic atomization nozzles in our country have given rise to three types that are widely used and offer good performance: BWJ, KH, and CS. Based on actual usage, these nozzles are capable of achieving an atomization particle size of around SMD60 microns for the raw materials, thereby ensuring that coking does not occur. When comparing these two key performance indicators, it is difficult to determine with exact data which one is better or worse. However, in terms of the amount of steam used for atomization and the wear resistance of the nozzles, KH nozzles use the energy of steam more efficiently thanks to the use of advanced materials; as a result, they require less steam and have a longer service life. Based on this understanding, we have consistently used KH nozzles.
The selection of nozzles is certainly important; manufacturing conditions, the properties of the raw materials, and design parameters are also crucial. During operation, the quality of steam, precautions for using different nozzles together, pressure drop, and adjustments to line speed are key factors for long-term reliable operation.
Could you provide the manufacturers and contact information for these types of nozzles? QQ385579539