[Q&A Question 278] 2017.10.06

(1) The operator on duty calls the dispatcher to start the hydrogenation reaction feed pump at the main substation; (2) Once the conditions are met, the operator on duty is instructed to start the high-pressure motor; (3) After starting the high-pressure motor, the operator on duty ensures that the flow rate at the pump inlet remains at least 80 tons per hour, and checks that all temperature sensors related to the pump are functioning properly; (4) The operator on duty listens for normal sounds from the motor and pump, and monitors the increase in lubricating oil pressure (if the pressure does not rise, the vent valve on the pump can be opened; once oil is seen flowing, the valve should be closed). One person shuts down the auxiliary oil pump motor and sets its switch to automatic mode, while another person adjusts the lubricating oil pressure to ensure it remains at least 0.2 MPa; (5) The operator on duty reports that everything is normal at the site, and the operator on duty then checks and closes the feed control valve, informing the other operator to open the feed line; (6) Once the feed line is open, the operator on duty adjusts the opening of the feed control valve according to production needs, slowly closes the return tank control valve, and ensures that the flow rate at the pump inlet remains at least 80 tons per hour, with the motor current not exceeding the rated value; (7) The return tank control valve is set to automatic mode, with the pump inlet flow rate maintained at at least 80 tons per hour. (8) Internal checks show that the lubricating oil pressure and temperatures at all points are normal.

1) Do not introduce the high-temperature liquid into the hydraulic turbine too quickly. 2) If it is difficult to determine the temperature difference between the outer surface of the hydraulic turbine and the internal fluid, as well as the temperature difference between the bottom and top of the turbine, yet the turbine shaft can be rotated smoothly by hand, this can also serve as a reference condition for starting the turbine. 3) Verify that the turbine is fully filled with liquid; once the turbine has reached the desired temperature, close the manual valve on the warm-up pump line. 3. Confirm that the outlet valve is fully open, open the interlock stop valve, set the control valve to manual mode, and initially adjust it to 15% opening. 4. Slightly open the valve on the inlet pipeline (Y-type globe valve) to introduce a small amount of high-pressure reaction product (hot high-boiling fraction oil) to the turbine to drive the rotor. 5. Maintain communication with the reaction and distillation teams, and closely monitor changes in the levels of the high and low liquid phases. Once the turbine rotor is started, do not further increase the opening degree of the inlet valve. 6. Check the operation of the turbine to ensure there are no abnormal noises; once the bearing temperature, seal leakage, and bearing vibration are all within normal ranges, gradually increase the opening degree of the inlet valve until the turbine reaches 2992 revolutions per minute, the inlet and outlet valves are fully open, and the flow control valve switches to automatic mode. 7. Conduct another comprehensive inspection of the turbine’s operation. At this time, the high-pressure liquid level is mainly reduced in pressure through a hydraulic turbine.

Turbine speed, feed flow fluctuations, high-phase liquid level

(1) The operator on duty calls the dispatcher to start the hydrogenation reaction feed pump at the main substation; (2) Once the conditions are met, the operator on duty is instructed to start the high-pressure motor; (3) After starting the high-pressure motor, the operator on duty ensures that the flow rate at the pump inlet remains at least 80 tons per hour, and checks that all temperature sensors related to the pump are functioning properly; (4) The operator on duty listens for normal sounds from the motor and pump, and monitors the increase in lubricating oil pressure (if the pressure does not rise, the vent valve on the pump can be opened; once oil is seen flowing, the valve should be closed). One person shuts down the auxiliary oil pump motor and sets its switch to automatic mode, while another person adjusts the lubricating oil pressure to ensure it remains at least 0.2 MPa; (5) The operator on duty reports that everything is normal at the site, and the operator on duty then checks and closes the feed control valve, informing the other operator to open the feed line; (6) Once the feed line is open, the operator on duty adjusts the opening of the feed control valve according to production needs, slowly closes the return tank control valve, and ensures that the flow rate at the pump inlet remains at least 80 tons per hour, with the motor current not exceeding the rated value; (7) The return tank control valve is set to automatic mode, with the pump inlet flow rate maintained at at least 80 tons per hour. (8) Internal checks show that the lubricating oil pressure and temperatures at all points are normal.

First, pay attention to the current of the pump motor; second, monitor the changes in feed volume and pressure.

For internal operation, first disconnect the minimum flow protection button of the hydraulic turbine pump, set the pump’s minimum flow control to 50% opening, and close the outlet control valve. After starting the pump, monitor the outlet flow and adjust it to a value slightly above the low alarm flow. Once the pump is operating properly, gradually open the outlet control valve; at the same time, adjust the minimum flow control based on changes in the total outlet flow. Once everything is normal, reset the minimum flow protection button.

The current of the motor, changes in feed rate, and changes in pressure.

Pay attention to the liquid level at high levels to prevent large fluctuations; on-site inspection shows normal conditions! Switch slowly