【Q&A Question 045】2016.06.04

Open the medium and low pressure vents, and open the cover for turning the shaft.

Release the load to zero, close the inlet and outlet, vent, and replace with nitrogen

Steam turbine! Ours is a reciprocating type

Verify interlocking; divert medium-pressure steam to vent, divert backpressure steam to vent, close the orbit manual valve, start the booster pump, perform manual shaft rotation, and switch the main seal gas to nitrogen when the pressure is below 0.7.

Maintain maximum flow circulation to bring out the hydrocarbons from the catalyst

The question you’ve come up with is absolutely unbelievable: L

In the event of a power outage, the oil pump stops, oil pressure is lost, and the circulation machine shuts down via interlock. Handle it as a shutdown accident

(1) When the circulator C2101 stops, the interlock shuts off the gas interlock valve of the main burner in the reaction heater F2101, causing the main burner of F2101 to go out； The operator immediately closed the gas control valve PV2105 of F2101, and reduced the flow rate at the preheating air cylinder valve of F2101, in order to prevent the flame of the pilot light from being blown out. The field operator immediately went to the site to confirm that the main burner of F2101 had been extinguished, and then closed the manual valves for each main burner. If the perpetual light goes out, close the hand valve for the perpetual light. (2) Stop the pump via interlock; close the reaction feed flow control valve FV2103 inside the room. Be careful not to let the level in raw material tank V2101 reach full capacity, and close the pump outlet valve on-site by the operator. (3) The interlock opens the emergency pressure relief valve XDV2104 to relieve pressure to the flare. Outdoor personnel shall conduct on-site inspections to confirm whether the pressure relief valve is open; the pressure reduction rate should be ≤ 0.7 MPa/min, and it is necessary to prevent the pressure drop across the bed from increasing too rapidly (pressure drop across the bed ≤ 0.4 MPa). (4) The new hydrogen compressor C2102 should remain in operation, with fresh hydrogen being supplied in full quantity to maintain gas flow inside reactor R2101. Closely monitor the temperature points of each bed layer in the reactor; if there is no significant increase, stop the emergency pressure relief. If the circulation machine can be brought back online in a short time, and the reaction temperature remains under control, the pressure of the reaction system should be maintained as much as possible to reduce the startup time. If the bed temperature shows an upward trend, pressure can be released intermittently until it is reduced to 0.5 MPa. (5) Due to interlock, stop the feed pump; cease receiving crude oil, and contact storage and transportation to stop the feed pump or switch to circulation mode. The operator shall close FV2101. (6) At the beginning of pressure relief, due to the extremely fast rate of pressure release, the oil stored in the reactor and high-pressure pipelines flows rapidly into V2102, causing its liquid level to rise; there is even a risk of the tank becoming full. Therefore, as an emergency measure, it is possible to activate the secondary oil relief system in such critical situations. Be careful to prevent the liquid level from dropping too rapidly, to avoid an accident where high pressure mixes with low pressure. (7) For indoor positions, special attention should be paid to monitoring the liquid levels, interfaces, and pressures of V2102 and V2103, as well as the liquid level of the cold high-pressure separator. (8) If the interface drops too rapidly, it is possible to inform the operators on site to close the upstream valves controlling the liquid flow and the interface. Prevent high voltage from leaking into low voltage. V2103 is in a state of pressure and liquid level maintenance. If the fault in C2101 cannot be resolved after an extended period, close the inlet and outlet manual valves of the compressor on site. If C2101 cannot be started for an extended period, stop the water injection and close the outlet valve of P2102 on site.