Summary of shutdown and emergency repair of molten salt pump failure

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This post was last edited by Black Gold at 2011-11-8 19:50 P8129 fault shutdown emergency repair summary 2007.07.02 1. Fault occurrence: Summer is coming. Based on past experience, in order to reduce the P8129 lubricating oil temperature, PA cooling is added to the lower side of the P8129 bearing to maintain the P8129 lubricating oil temperature at 81°C in summer and around 75°C in winter. (1) During the day shift on June 27, 2007, it was found that the oil temperature of P8129 lubricating oil TI87023 was at 97°C. The technicians connected the hoses at the inlet and outlet of the lubricating oil cooling water, used DW to reversely flush the oil cooler, and then used PA to purge and put CW into use. TI87023 rose to 100°C in a short time and then returned to 97°C. If the treatment has no effect, the upper side of the bearing is purged and cooled with PA on site. (2) During the day shift on June 28, the P8129 lubricating oil tank was sprayed with water to cool down, and the PA on the upper side of the bearing was changed to purge the lubricating oil tank. ； TI87023 is maintained at 93°C. (3) At 9:05 on June 29, it was found that TI87023 dropped rapidly, and the main control trend found that it dropped from 8: Started to fall at 50, 9: 40 hours dropped to 32℃ ； On-site inspection showed that the temperature of the lubricating oil tank was relatively low, and the temperature difference between the inlet and outlet oil pipelines of the bearings was small. ； The oil level in the oil tank is high. 2. Analyze the cause and confirm the solution: Reason 1: The oil level is high. Disassemble the breathing cap and open the oil drain wire on the underside of the sight glass to drain the oil, which is lower than the oil return port. Reason 2: The lubricating oil hose is clogged. Disassemble the union at the end of the oil return pipe and find that no lubricating oil flows out. Even after lowering the outlet position, there is still no lubricating oil flowing out. ； Add a little PA from the air lift cap of the lubricating oil tank. If oil is discharged from the lubricating oil outlet, the cause of pipeline blockage is eliminated. Reason 3: Pump wheel failure. The failure of the pump wheel prevents the lubricating oil from circulating. The on-site temperature measurement showed that the shaft temperature was 200℃ and the upper side of the bearing was 100℃. Can keep running. 3. Parking: June 29 12: At 00:00, the system stops and R8101 sublimates. July 2nd 01: P8129 small cycle at 02 hours, the current has no obvious change. Start to cool down. 07: Stop P8129 at 18:00 and the temperature drops to 290℃. Instrument, electrical 1.P8129 replacement: (1) Lift out the old pump: V8122 keeps a small amount of nitrogen added. roof removal ； Insulation removal ； Removing coupling bolts ； Pump outlet bolt removal ； Cooling water and packing nitrogen pipelines are removed. The motor is lifted out. Blow away debris and dust around the pump. Lift out the pump body. V8122 is covered with a temporary stainless steel cover. In order to prevent MN from solidifying, flush the pump body with LS and DW immediately after lifting it out. (2) New pump treatment: rust removal: Remove rust and debris from the new pump body and pump body. Inspect:: Disc pumps are flexible. (There is one less nut at the connection between the pump body and the flange. Mechanical repair removes the reinstallation on the old pump. ) The pump body is connected to steam for preheating. (Reduce the temperature difference between the pump body and MN) Reinstall the pump suction pipe. (3) Lift in the new pump: Clean the debris and dust around the V8122 temporary cover. The new pump is hoisted into the flange port and lowered slowly, stopping when the pump body is close to the liquid level. There is about 1.2 meters between the pump body flange and the flange mouth. Use a marker to draw vertical straight lines on the pump body, and divide the flange and flange mouth into 12 equal parts. Continue to drop the pump body, staying for 5 minutes each time it falls, until the pump body is in place. ―――Falling slowly allows the pump body components to be heated evenly, the heating rate is stable, and the longer pump shaft is not easily deformed. (4) Motor reassembly: After the new motor is hoisted in place, due to the large distance (7mm) between the motor and the pump body, the coupling cannot be reinstalled, so the new motor is hoisted out for processing. It was difficult to remove the positioning wire of the backrest wheel of the new motor, so I decided to reinstall the old motor. The backrest wheel of the old motor is pulled out 7mm ； Motor air duct and hood cleaning ； Oil the bearings. The new motor is put back in place. (5) Outlet flange, pump coupling, pump body * * Blue, packing nitrogen, etc. are reset. 2. Come on: Disconnect the CW flange of the oil cooler and take out the oil cooler coil. Clean the oil tank. Add Glycole 22 lubricating oil into the oil tank, and the oil level is located in the middle of the lubricating oil inlet and outlet. Loosen the far end of the oil return pipe or the joint, and turn the machine forward until the oil return pipe continuously drains oil without bubbles. ―――You can reinstall the coil, open the air lift cap, cover the return port of the oil cooler with your hand, and add a little PA to the air lift cap until the oil is discharged. ―――It is strictly forbidden to leave lubricating oil or rags behind during the entire operation. Reinstall the return pipe, coil pipe, and CW pipeline. Open the refueling hole on the top of the oil tank and replenish the oil level until the oil level is 5~10mm below the oil return port. When the oil level is high, drain the oil through the small plug on the lower side of the sight glass. After the oil level is replenished, mark it on the sight glass for reference during inspection. 3. Test drive: F8101 is ignited and preheated, and the preheating temperature is equal to the MN temperature in the V8122 tank (280°C). Process inspection nitrogen, cooling water, etc. are ready for start-up. Crank the car, test the motor, and check the motor steering. Start the motor: first: It was found that there was a lot of smoke and a small amount of liquid coming out of the packing after the pump started. It was judged that grease was used when filling the packing. After running for 3 minutes, there was still a lot of smoke. Stop the pump and tighten the packing. second time: If there is still a lot of smoke after startup, run monitoring. On-site measurement: The return oil temperature is 75℃, the motor shaft temperature is 140℃, the packing gland temperature is 180℃, and the main control oil temperature rises evenly. If there is no improvement after running for 5 minutes, stop the machine. Loosen the stuffing. third time: After being out of service for 30 minutes, it started and improved. Stop and check after running for 30 minutes. The inspection found that the pump packing nitrogen purge union joint had a large air leakage, and nitrogen was not added to the pump body. After taking it apart, it was found that there was no expansion ring installed in the slip knot. After disassembling the old pump pipeline and reassembling it, only add 10Kg/H after the nitrogen is fully turned on. A small amount of loose packing will have no effect. fourth time: After starting, check all parameters of the pump to see if they are running normally. After running for 30 minutes, the packing will become less loose, and the amount of nitrogen added will be larger, and it will be adjusted to 15Kg/H on site. After running for 1 hour, check that all parameters are normal and the oil temperature is stable at around 73°C. PA is added to the oil tank for cooling. 4. Feeding: P8129 small cycle, F8101 heats up. When the temperature of V8122 is close to the temperature of R8101, P8129 is cycled, and the temperature of F8101 is raised to 400~420℃, which is suitable for feeding. Process feeding. 5. Check after the system is running normally: Oil temperature is relatively stable: 78℃ during the day and 73℃ at night, running well. The motor coil temperature and bearing temperature are normal.