Is the fouling of the smoke extractor wheel related to the amount of steam supplied?

Orifice plates are installed on the purge steam, so this amount will have no impact. Is the regenerator still in poor condition, and are there any leaks in the external tube bundle?

Assuming there is no orifice plate in the purge steam, will having the DN10 valve fully open have an impact?

I think it has more to do with the temperature of the steam used for cooling the rotor; when the temperature of this steam is high (200–260°C), in order to prevent the rotor from exceeding its maximum temperature limit of ≯370°C, it becomes necessary to use more steam for cooling the rotor. When the amount of steam is high, no matter how good the quality of the steam is, it will inevitably contain some water. This water acts as a binder, directly increasing the likelihood of scaling forming on the blades of the rotor. As for the sealed steam, it basically has no effect on blade scaling; firstly, the amount is relatively small, and secondly, since it is sealed behind the rotor disc, this steam never reaches the blades at all. Therefore, to ensure the long-term stable operation of the smoke extraction system, it is necessary to focus on the recovery efficiency of the first three rotors. The triple spin has a high recovery efficiency, and the catalyst dust concentration at the inlet of the flue gas extractor is low; everything else isn’t an issue.

The problem of fouling in flue gas exhaust systems was most prevalent during the 7-8 years around the year 2000. Our facility also struggled with this issue for a long time; I personally reviewed a large amount of information on flue gas exhaust system fouling from various organizations, and there was also plenty of relevant material shared on forums. The causes of such fouling were analyzed from various perspectives, including catalysts, equipment, and manufacturing processes, and various organizations developed different methods to reduce fouling in these systems. In 2009, I was participating in training related to a certain position within a group company, and I discussed this issue with colleagues from various departments; everyone had their own opinions, making it difficult to determine the right answer. We also made adjustments based on the actual conditions of our own equipment. Things would improve at first, but that improvement didn’t last long; it was very frustrating. After three months to half a year, operations had to be stopped – the machines had to be shut down! Later, a Dafour mixed oil was developed, and a catalyst was created specifically for this purpose; as a result, the flue equipment never suffered from scaling again. Moreover, that cycle even broke the operating time record of our facility. So, what on earth were we doing all that for? {:3_62:}

Is the catalyst really that important? Are its performance parameters significantly different from those of the original one?

Although they didn’t say it explicitly, I’ve looked up a lot of information and the composition of the catalyst has been changed; I won’t go into details!

Got it. I’ll check some more information to see if there’s a connection, and I’ll examine the various additives we use to see if there are significant changes in each group

The cooling steam for the rotor is superheated steam; fouling in the flue gas system has little to do with the steam used for the rotor