Sulfur recovery issue
Thread Content
How are the blowers in the sulfur recovery unit switched?
1. Start the standby fan in accordance with the fan startup procedure, and check whether the fan is operating normally. Once the fan is functioning properly, gradually open the outlet valve of the standby fan slowly, while at the same time closing the vent valve of the standby fan. Also, close the outlet valve of the fan that is currently in use, and open the vent valve of that fan. 3. The speed at which these valves are operated must be slow; adjust the inlet air volume to minimize fluctuations based on the pressure and flow rates at the fan outlet. If there is a pressure-flow interlock mechanism, it can be temporarily disabled to avoid such interlocks. After the switchover is complete, keep using the fan that was previously in operation
1 Start the backup fan according to the operating procedures, vent through the outlet relief valve, and keep the outlet interlock valve in the manually closed position. 2 Change the fan outlet interlock to manual. Then close the outlet and open the empty one, while the backup action is the opposite. During this process, the pressure should be kept as stable as possible. 3 After the switch is completed, the previously in-use fan stops operating, and the fan outlet interlock is changed to automatic mode.
Follow the fan switching procedure! First, start up the standby fan and drain it completely. Gradually introduce the air from the started standby fan into the system, while gradually reducing the airflow from the fan that is currently in use. Once all the air from the standby fan has been introduced and the fan currently in use has been completely drained, shut down that fan!