When or under what conditions should the catalyst be screened?
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This post was last edited by mkp369 on 2018-5-16 at 10:59. The device has been in operation since August, for nearly two years now. To determine whether it’s necessary to carry out screening at various stages, I found documents indicating that screening may be done after two years, as well as after four, six, or eight years. Experts, how do you determine the timing for screening in your devices? Do you base it on the operating time, the pressure difference across the bed layers, or the amount of acid product produced?
The effective content of the catalyst can be measured, and the next steps can then be determined based on the actual operating conditions and experience
The capacity of the fan design is fixed; if the system resistance increases, the air flow rate decreases, and as a result, the output will inevitably drop. For example: if the target is a daily production of 600 tons, the use of new catalysts can enable a production capacity of 630 tons. If it is not possible to achieve a daily output of 600 tons at present, then the catalysts need to be replaced —— Nanjing Yungao Technical Service Team
Evaluate comprehensively by considering the degree of increase in the pressure drop across the converter bed and the conversion rate
If you have time, it’s useful to go through and check whether there are any benefits or drawbacks. It is recommended to consider various factors comprehensively
During the annual maintenance, it’s best to screen those with a significant increase in resistance and replace them with new ones
This topic is quite broad; a comprehensive assessment is required by taking into account factors such as resistance at various levels, conversion rates, temperature increases, and inspections after shutdown. Generally speaking, it is better to screen each layer during the conversion process (there are many things to keep in mind); the movement of the catalyst should proceed from low temperature to high temperature, and the external heat exchangers as well as the absorption tower must be in place to achieve optimal results.