The main fan in catalytic cracking is an axial flow fan, while the backup fan is a centrifugal fan. Are there any problems with this configuration?
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The main fan in catalytic cracking is an axial flow fan, while the backup fan is a centrifugal fan. Are there any problems with this configuration? For various reasons, our factory needs to use fans from other manufacturers as backup units; however, these fans are centrifugal fans, while our main fans are axial flow fans. I would like to ask if there are manufacturers with the same configuration; what problems might arise with such a configuration, and what should be taken into consideration regarding its operation?
In catalytic cracking units of moderate scale, the standby units are generally of the centrifugal type, as these units are mainly used at the beginning of operation, with limited frequency and duration of use, so this approach is acceptable
Mainly, both the primary and backup units of our #1 catalyst system are of the axial flow type. We have not actually used a combination of axial flow and centrifugal designs before, so we would like to ask if there are any particular points to keep in mind regarding the operational procedures? Or rather, what is the biggest difference in terms of process operation when both the primary and backup units are axial flow fans?
No special attention is required; just follow the startup procedures for the centrifuge. When making adjustments, be careful to control the outlet pressure and flow rate to avoid surge
1. Both axial flow compressors and centrifugal compressors can be used as the main catalytic fans. 2. Generally, centrifugal compressors are simple to control, have relatively low costs, but offer a relatively narrow range of flow rates. 3. Each type can be operated independently without any problems. 4. If online switching is required, attention must be paid to the balance between flow rate and pressure: the flow rate through both machines should be roughly the same, with the exit pressure of the incoming machine being slightly higher than that of the outgoing machine. When making the switch, it is necessary to have emergency plans in place to prevent downtime of any one unit; without an adequate control system, accidents are likely to occur. In such cases, it is advisable to quickly shut down the other compressor and let the system valves operate according to the emergency shutdown procedure.
Our company uses this kind of configuration: axial flow fans are used for normal operation, while centrifugal fans are used during startup/shutdown or when switching smoke exhaust fans