Weekly Topic for Ammonia Production: How Should the Compressor Be Managed During Dry Gas Sealing? July 24 – July 30

Reply to 1# 90423042: 1. Parking operation: a. Set the energy adjustment knob to the “Energy –” position to reduce the energy indicator to “0”, then move the knob to the “Positioning” position. 　　b. Close the inhalation stop valve. 　　c. Press the main unit stop button to shut down the main unit and close the exhaust valve. 　　d. Oil pump stopper. 　　e. Turn off the power switch. 2 Precautions during normal operation a. During operation, the suction pressure, exhaust pressure, oil temperature, and oil pressure should be monitored, with records taken once per hour. 　　b. Main control parameters: Inlet pressure: 0–0.433 MPa; Exhaust pressure: ≤1.56 MPa. Inlet temperature: 0–5°C; Exhaust temperature: ≤80°C. Oil temperature: ≤65°C; Oil pressure: 0.15–0.30 MPa higher than the exhaust pressure. Cooling water pressure: 0.2–0.4 MPa; Motor current: ≤rated current. c. In the event of a sudden power outage that causes the main unit to stop, the compressor may reverse due to the difference in pressure between the exhaust and inlet sides. In such cases, the inlet shut-off valve should be closed promptly, which helps to balance the pressures at the exhaust and inlet ends of the compressor in a short time and thereby reduces the risk of reversal. 　　d. During operation, if the machine stops automatically due to some safety protection mechanism, it must be restarted only after the cause of the fault has been identified ； Under no circumstances should the machine be started again by arbitrarily changing its setting value. 　　e. Adjust the discharge pressure of the oil pump so that the oil pressure is 0.15–0.30 MPa higher than the exhaust pressure of the compressor. If the oil pump’s discharge pressure is low, reduce the oil pressure control valve ； If the oil pressure is too high, increase the oil pressure control valve to bring the discharge pressure of the oil pump to the required value. 　　f. If the vehicle is parked for an extended period during colder seasons, the water stored in cooling devices such as the oil cooler in the system should be drained completely. 　　g. When the compressor is operating normally, if the oil level is found to be below the specified value, oil must be added immediately. There are two ways to refuel: one is refueling while the engine is running. Slightly adjust the suction shut-off valve so that the suction pressure is slightly lower than atmospheric pressure. Open the filling valve on the compressor oil filter, but be sure to add oil slowly and carefully to avoid damaging the machine. Pay attention to any changes in the machine’s sound during oil filling to prevent vibrations. After adding the oil, close the filling valve and adjust the suction shut-off valve to its normal operating position. The second is parking to refuel. 　　h. In systems equipped with backup machines, switch them over for operation on a regular basis: every three days during spring or in rainy weather, and once a week at other times ； Or switch over immediately upon shutdown. 　　i. For machines that have been shut down for more than 5 days, an electrician must check the motor’s insulation before restarting them. 　　j. When the compressor is operating with liquid ammonia present, slightly reduce the opening of the evaporator throttle valve to lower the suction pressure ； In more severe cases, close the throttle valve and reduce or close the suction valve; then gradually open the suction valve based on the suction pressure until all the ammonia in the system has been removed. Open the suction valve slowly until the ammonia pressure in the system returns to normal, after which restore the opening degree of the throttle valve. An additional chiller can also be added to speed up the ammonia extraction process. 3 Driving Operations a. Ensure that the freezer is in good condition. When starting the vehicle again after a parking period of 5 days or more, it is necessary to have an electrician check the motor’s insulation before driving. 　　b. Rotate the shaft 3–5 times to check for any jamming. 　　c. Ensure that the selector switch is turned to the manual position, open the shut-off valve beneath the safety valve, and close the electromagnetic bypass valve. 　　d. The energy indicator pointer is at the “0” position, which corresponds to a 15% load level. 　　e. Start the oil pump by pressing the oil pump start button. 　　f. After 5 to 10 seconds, the pressure difference between the oil pressure and the exhaust pressure can reach 0.15 to 0.30 MPa. 　　g. Contact the main controller, and once it is confirmed that the host can be started, press the host start button to initiate the compressor. 　　h. Open the compressor’s exhaust shut-off valve, observe the suction pressure gauge, and gradually open the suction shut-off valve. 　　i. The compressor starts operating. Adjust the oil pressure control valve so that the oil pressure difference (the difference between the injection pressure and the exhaust pressure) is 0.15 to 0.30 MPa. 　　j. Set the energy adjustment knob to the “Energy+” position to raise the energy indicator to 100%, then move the knob to the “Position” position. 　　k. Check the pressure and temperature difference during compressor operation; if anything is abnormal, stop the machine for inspection.

When the oil system stops, the compressor also stops; the high-level oil tank or the emergency oil pump begins to supply oil to the bearings, thereby starting the shaft rotation! !

There’s no isolation gas left at the back – can the emergency oil pump be used? The purpose of the rear isolation gas is to prevent oil from entering the compressor.

If the dry gas seal fails, follow the emergency shutdown procedure. The turning of the shaft can be done manually.

This post was last edited by 654262293 on 2011-7-24 20:46. 1. Parking procedure: a. Set the energy adjustment knob to the “Energy –” position to reduce the energy indicator to “0”, then move the knob to the “Positioning” position. b. Close the intake stop valve. 　c. Press the main unit stop button to shut down the main unit and close the exhaust valve. 　d. Oil pump stopper. 　e. Turn off the power switch. 2. Precautions during normal operation) a. During operation, the suction pressure, exhaust pressure, oil temperature, and oil pressure should be monitored, with records taken once per hour. 　　b. Main control parameters: Inlet pressure: 0–0.433 MPa; Outlet pressure: ≤1.56 MPa. Inlet temperature: 0–5°C; Outlet temperature: ≤80°C. Oil temperature: ≤65°C; Oil pressure: 0.15–0.30 MPa higher than the outlet pressure. Cooling water pressure: 0.2–0.4 MPa; Motor current: ≤rated current. c. In the event of a sudden power outage that causes the main unit to stop, the compressor may reverse due to the difference in pressure between the outlet and inlet sides. In such cases, the inlet shut-off valve should be closed promptly, which helps to balance the pressures at the compressor’s outlet and inlet sides in a short time and thus reduces the risk of reversal. ) d. During operation, if the machine stops automatically due to some safety protection mechanism, it is necessary to identify the cause of the fault before restarting it ； Under no circumstances should the machine be started again by arbitrarily changing its setting value. 　　e. Adjust the discharge pressure of the oil pump so that the oil pressure is 0.15–0.30 MPa higher than the exhaust pressure of the compressor. If the oil pump’s discharge pressure is low, reduce the oil pressure control valve ； If the oil pressure is too high, increase the opening of the oil pressure control valve to ensure that the discharge pressure of the oil pump reaches the required value. f. If the machine is parked for an extended period during colder seasons, drain all the water from the cooling devices such as the oil coolers in the system. 　g. When the compressor is operating normally, if the oil level is found to be below the specified value, oil must be added immediately. There are two ways to refuel: one is refueling while the engine is running. Slightly adjust the suction shut-off valve so that the suction pressure is slightly lower than atmospheric pressure. Open the filling valve on the compressor oil filter, but be sure to add oil slowly and carefully to avoid damaging the machine. Pay attention to any changes in the machine’s sound during oil filling to prevent vibrations. After adding the oil, close the filling valve and adjust the suction shut-off valve to its normal operating position. The second is parking to refuel. 　h. In systems equipped with backup machines, switch them over for operation on a regular basis: every three days during spring or in rainy weather, and once a week at other times ； Or switch over immediately upon shutdown. i. For machines that have been shut down for more than 5 days, an electrician must check the motor’s insulation before restarting them. 　　j. When the compressor is operating with liquid ammonia present, slightly reduce the opening of the evaporator throttle valve to lower the suction pressure ； In more severe cases, close the throttle valve and reduce or close the suction valve; then gradually open the suction valve based on the suction pressure until all the ammonia in the system has been removed. Open the suction valve slowly until the ammonia pressure in the system returns to normal, after which restore the opening degree of the throttle valve. An additional chiller can also be added to speed up the ammonia extraction process. 　　a. Ensure that the freezer is in good condition. When starting the vehicle again after a parking period of 5 days or more, it is necessary to have an electrician check the motor’s insulation before driving. 6 m. [; x2 p- Q, K P9 M 　　b. Rotate the disk 3–5 times to check for any signs of jamming. c. Ensure that the selector switch is turned to the manual position, open the shut-off valve beneath the safety valve, and close the electromagnetic bypass valve. 　　d. The energy indicator pointer is at the “0” position, which corresponds to a 15% load level. 　　e. Start the oil pump by pressing the oil pump start button. 　f. After 5 to 10 seconds, the pressure difference between the oil pressure and the exhaust pressure can reach 0.15 to 0.30 MPa. 　　g. Contact the chief operator; once it is confirmed by the chief operator that it is safe to start the compressor, press the start button for the compressor, and the compressor will begin to operate. 　h. Open the exhaust stop valve of the compressor, observe the suction pressure gauge, and gradually open the suction stop valve. 　i. The compressor enters operational mode. Adjust the oil pressure control valve so that the oil pressure difference (the difference between the injection pressure and the exhaust pressure) is 0.15 to 0.30 MPa. 　 j. Set the energy adjustment knob to the “Energy+” position to raise the energy indicator to 100%, then move the knob to the “Position” position. 　　k. Check the pressure and temperature difference during compressor operation; if anything is abnormal, stop the machine for inspection.

A storage tank can be set up to hold some nitrogen for use in emergency situations.

Good, you can learn a lot by coming in

It is essential to address the backup gas sources for the secondary and isolation gases; this is an obstacle that cannot be bypassed.