Science and technology forum financial technology letter, air compressor often faults are excluded from Zhenxing Qihua Group Co., Ltd., Qiqihar, Heilongjiang, 16100, 1 steam turbine, frequent failures and troubleshooting methods, steam turbine drive air compressor turbine process flow description, pressure is 5.03, temperature is 420 The steam flows through the main valve steam filter quick-closing valve and the shut-off valve at the inlet of the regulating steam valve to the steam evaporation chamber. When the regulating steam valve is opened, the steam passes through the steam chamber and enters the expansion space of the steam turbine through the nozzle, where the steam will The child can be released to the rotor and expanded to the final pressure, then enters the condenser, condenses into water in the condenser, and forms a constant degree of vacuum, which is sent out by the condensate pump for recycling. In order to maintain the vacuum degree of the condenser, a steam aspirator is provided to extract the non-condensable gas in the condenser, and the extractor power steam is cooled and recovered to the condenser.

1.1 Turbine abnormal vibration and abnormal sound 1 è…§ suddenly strong vibration or clear friction sound, should break the vacuum, emergency stop 1.12 in the case of load changes, the unit does not have strong vibration or suspicious sound, Reduce the load until the vibration is eliminated, and analyze the cause of the vibration. For this reason, check whether the lubricating oil pressure is reduced. Whether the inlet oil temperature is too high or too low, is the bearing oil temperature too high; 1 Is the main steam temperature too high? Whether the main steam temperature is reduced to the extent that the wet steam enters the steam turbine. The cylinder cylinder expansion condition should be ascertained when the cylinder expands in one direction. Whether it is affected by the cold air flow, if necessary, close the doors and windows to eliminate it in time.

1.13 If it is started, the shaft seal or the circulation part of both ends can be heard clearly. 1.1.4 When the machine is shut down, if the shaft seal or the circulation part can hear clear friction sound, it must be repaired before the next start.

1.15 If there is not much vibration during start-up, reduce the speed until the vibration is removed and warm up for 15 minutes at this speed, then gradually increase the speed. If the vibration still occurs, the speed needs to be reduced. This operation must not exceed minutes.

1.1.6 If the one-way expansion of the cylinder occurs during startup, check whether the speed control steam valve is fully open, and ensure that the start and warm-up work is carried out under the full open state of the speed control steam valve.

7 If the spleen is present due to the above vibration, the vibration may be caused by the following reasons: the impeller is broken and the shaft is loose. The unbalanced shaft of the rotor is bent; the shaft seal is damaged; the front end of the shaft is broken. In addition to the vibration, sparks may emerge from the steam seal part; some parts of the steam turbine are deformed, and there is a flow between the rotating part and the fixed part of the turbocharger compressor and the fixed part of the steam turbine. Not correct; oil film is unstable.

For the above reasons, only when the machine is shut down, it can be checked clearly after being partially disassembled or completely disassembled.

The vacuum degree of the 12 steam turbine condenser decreases, and the vacuum finger decreases, while the exhaust gas temperature rises and the condenser temperature difference increases significantly. The principle of vacuum reduction is first to check the exhaust pressure and exhaust steam temperature, to confirm that the vacuum has decreased; then adjust the load and take corresponding measures according to its characteristics to eliminate the fault and return the vacuum to normal, as follows: 12.1 circulating water interruption or insufficient circulating water When the circulating water pressure returns to zero, the circulating water is interrupted, the unit load should be quickly reduced, and if the vacuum falls, the vacuum will slowly fall, the circulating water temperature will rise more, and the clear circulating water will be insufficient. .

122 shaft seal steam supply interruption When the load is reduced, the shaft seal supply steam is not adjusted in time to cause vacuum drop. The shaft seal should be adjusted into the steam boy and pressure in time.

The mountain vacuum system pipeline is seriously leaking or the valve is not tight, the pipe is uneven, causing the vacuum system pipe to rupture or the flange leaking steam. 12.4 Condenser full of water or water level rise If the condensate pump is abnormal, the standby water should stop the accident record; Check if the condenser fill valve is accidentally opened.

125 Check whether the following atmospheric safety is broken; the condenser water level gauge is not strict. The vacuum valve on the vacuum line is not strict. 13 The displacement of the steam shaft is increased. 13.1 When the axial displacement exceeds the normal value, the load should be quickly reduced to reduce the axial displacement. Below the rated value; check the outlet temperature of the thrust bearing and the temperature of the thrust bearing; monitor the presence or absence of abnormal sound vibration, and whether there is abnormal friction sound at the shaft seal; measure the vibration of the eye bearing of the turbine.

132 If the shaft displacement increases, accompanied by abnormal noise and vibration, or the axial displacement exceeds the stop value under the condition of empty load operation, the leg should be vacuumed and emergency stop.

2 Air compressor oil circuit, common faults and troubleshooting methods Air compressor oil circuit system process flow description Oil supply system consists of fuel tank group oil pump two oil coolers 4 oil filter accumulator 1 high tank and necessary pipeline It consists of connectors and electrical components. The oil in the main tank in the whole process is pressurized by the main oil, cooled and filtered, and then divided into roads and sent to the bearings of the steam turbine air compressor for lubricating oil; the oil pressure control system sent to the steam turbine; Go to the car device. Each return oil returns to the fuel tank. During normal operation, the high fuel tank is filled and a small amount of overflow is maintained. Once the Italian North occurs, the lubricating oil can be supplied to the bearings of the unit for a short time.

21 Main oil pump malfunctions If the sound of the oil pump is abnormal, start the auxiliary oil pump, stop the main oil pump, and cut off the interlock. Close the main oil pump inlet outlet valve and check the main oil pump.

22 system oil leakage 22.1 fuel tank oil level and oil pressure simultaneously reduce oil pipe rupture, there is oil leakage at the flange valve, oil should be added and the leakage point should be eliminated; check the cooling water in the oil cooler, if there is oily oil oil cooler For oil leakage, the group standby oil cooler should be switched to operate.

222 oil level is unchanged but the oil pressure is reduced. The suction filter of the main oil pump suction side is blocked. The spare oil pump should be started. Check whether the oil pump check valve is tight while cleaning the main oil recording filter. If the speed control oil pressure is not maintained, the oil pressure can not be maintained. In normal operation, a downtime should be performed.

223 oil tank oil level is reduced and the oil pressure is unchanged. First check whether the oil level gauge is malfunctioning. If it is normal, it is caused by oil leakage or mis-opening of the oil valve, such as various connecting pipes and bearing return pipes of the fuel tank. Handling and replenishing the lubricating oil to the normal level If the oil system leaks oil and cannot be eliminated after taking measures, the auxiliary oil pump should be started before the oil level drops to the minimum allowable oil level to stop the machine.

23 bearing temperature rise If a bearing temperature rise may be caused by impurities entering the bearing, or the oil pipe is reduced, etc., if the adjustment of the oil inlet valve can not be normal, it should be stopped; the oil in the dirty oil should be stopped. Filter oil or oil change treatment; if all bearing temperature rises, é—° oil pressure, if the oil pressure is normal, check the oil temperature of the lubricating oil, the oil temperature is too high, the oil cooler cooling water valve should be opened, if it is oil The cooler heat exchange effect is poor, and the 4 spare oil cooler should be switched.

When the oil system fails to extinguish in the fire system, the fire emergency stop should be destroyed, and the firefighters should be notified to the site to stop the fire. When the oil is on fire during the start-up process, the oil pump should be stopped.

25 oil system water inlet failure is caused by excessive leakage of the shaft seal of the high pressure section or improper adjustment of the shaft seal supply pressure. The steam enters the oil system through the bearing and causes the oil cooler to rupture and the water enters the oil system. In order to prevent the oil system from entering the water, the following measures can be taken to keep the oil pressure of the oil cooler larger than the water pressure and maintain a good shaft seal clearance; adjust the proper steam supply pressure and ensure that the shaft seal pipe is unblocked, regularly test the oil quality, and find the oil. When there are water and impurities, the oil should be filtered and dehydrated in time. When adding new oil to the fuel tank, the oil machine should be touched to prevent impurities from entering.

3 Air compressor common faults and troubleshooting methods Air compressor system process brief description After the raw air is removed by air filter to remove dust and impurities, first enter the air compressor, after the stage compression 12 cooling, the final pressure is about 0.63 discharge temperature 96 The clean air is sent to the air cooling tower for cooling and then sent to the rear system.

3. Ningchen 3.1.1 air compressor occurs, the phenomenon of 1 flow is greatly reduced, the outlet pressure fluctuates, strong vibration occurs, and there is a low humming sound or a whistling sound of the airflow. When the pressure is slightly surged, the flow pressure fluctuates and the sound is not obvious. Strict, 1 Pan will cause damage to the unit.

3.12 Causes of Surge 1 Export pressure is too high 9 Insufficient air intake 沁 Shaft end seal interstage seal damage failure, interstage gas leaking child plus nine make interstage flow boy insufficient; reduce load over 恍 improper operation anti-vibration Adjustment, failure or regulation automatically.

32 Cooling water flow rate drop 321 Cooling water flow rate drop will cause the lubricating oil temperature to rise. Common causes are system pipelines, blocked pipelines, and low water pressure.

322 According to the actual situation, the cleaning filter can be used to open the large water inlet valve, and the parking should be stopped for serious leakage.

In short, if an abnormal phenomenon occurs in the operation of the air compressor, it is necessary to immediately find out the cause of the fault, and immediately eliminate the fault. After the repair, it can be used continuously. Do not blindly use it, resulting in unpredictable loss. To ensure the long-term safe and stable operation of the air compressor, it is necessary to make a scientific and systematic system for daily operation and maintenance.

Zheng Song, Wang Longnan, Pan Yuhua. Distributed control system standardization of the era of heavy electric, 5 Li Zheng, 03 in the application of air separation equipment Gong mechanical and electrical engineering Wu Jianping, Wang Jian 13 system in the application and operation of air turbine compressors cryogenic technology 12006

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