Start-up and shutdown procedures for the transformation section
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I would like to ask everyone about the sequence of steps for starting up and shutting down the conversion unit
1. First, the catalyst should be heated for reduction. (Nitrogen heating or steam heating) 2. Raise the bed temperature to the catalyst’s initial activity temperature. 3. Introduce the feed gas; at first, the flow rate should be low, and the gas-to-gas ratio can be set a bit higher, with the flow rate gradually increased depending on the circumstances. 4. Pay attention to the bed temperature, which shows a trend of first decreasing and then increasing, to avoid overheating. 5. Improve system drainage. 6. Once the bed temperature reaches the normal operating temperature, the analysis sample is considered satisfactory. When stopping, 1. gradually reduce the load. Reduce the amount of feed gas and steam used; 2. Cut off the feed gas. 3. Cut off the steam. 4. Close the transformation outlet valve. 5. System pressure holding.
Thank you for your help. I was wondering if anyone could explain in detail the sequence for turning equipment on and off. For example, when shutting down the system, which equipment should be turned off first?
Now, many manufacturers use sulfur-resistant catalysts, and crude gas is used to heat the gas; the first step is to sulfurize and activate the catalyst. As for parking, the converter also requires nitrogen protection.