Boiler feed pump is an important part of the boiler automatic level control system, once the feed pump failure will seriously endanger the operation of the boiler safety, serious will lead to major accidents. Therefore, to strengthen routine maintenance and repair of boiler feed water pump has become an important work of modern boiler maintenance department. Only the elimination of fault causes can avoid the recurrence of the same type of fault. Analysis and Elimination of Common Faults of Boiler Feedwater Pumps The routine maintenance of modern boiler feedwater pumps must be based on fault prevention and set up a scientific conservation system and system to guide the daily maintenance work of feedwater pumps. To set up pump parts failure and replacement records, a detailed grasp of the damage time of various components, in order to facilitate the replacement of components in time before the end of life, to avoid damage to components (such as bearings, etc.) and found not timely damage to the unit. Common boiler feed pump failure is mainly concentrated in the lubricating oil system, shelter system, speed control system, auxiliary motor overheating and insufficient flow and other aspects. Boiler feed pump common fault analysis and troubleshooting 1. Electric feed pump motor overheating For the use of motor-driven feed pump, the motor is the most common overheating. The cause of motor overheating is mainly due to the voltage is high or low, poor transmission, ventilation system failure or unit failure caused motor overheating. Serious motor overheating will cause insulation burnout, broken rotor bar and so on. Therefore, in the discovery of motor overheating should be used when the other pneumatic power, downtime maintenance. Overheating of the motor due to voltage causes the motor power system to be checked, and overheating of the boiler feed pump motor is resolved by recovering a stable power supply. In addition, poor transmission can cause overheating of the motor. As a result of poor transmission between the motor and the feed pump, the load of the motor is too large, causing the phenomenon of a small horse-drawn cart. The overload of the motor causes the temperature to rise. This situation must be timely maintenance, causing the unit failure. A thorough investigation of the traditional system of electric motor and feed pump, the common traditional poor mainly due to the lack of transmission system bearing rotation, bearing damage caused. Find the point where the fault can be replaced or lubricated. As the same sub-system caused by motor failure when the motor is one of the most common failure, which is mainly due to fan damage, ventilation blockage, bearing wear and other reasons make the ventilation system can not complete the work to be done, causing the motor overheating, serious will burn Coil. This situation must be itemized to find out the cause of the malfunction, smooth ventilation holes, repair the fan, replace the bearing to solve the problem. 2. Pump pump overheating boiler feed pump overheating common cause is due to friction caused by bearing friction, or due to lack of lubrication system, poor oil quality caused. Therefore found to pump overheating after the pump should first check whether the lack of lubrication system or oil contains impurities, etc., followed by inspection bearing damage. Overheating of the pump body that has just undergone an overhaul should also check whether the clearance of the rolling bearing or bracket cover is too small. After the above inspection, the pump body still appears fever should check the pump shaft is bent or two axes are not the same, check the impeller balance, adjust the pump shaft or adjust the concentricity of the two shafts, clear the impeller balance hole, in order to ensure the pump shaft and impeller rotation Balance, troubleshoot 3. Boiler feed pump flow less than the main reason for the boiler feed pump flow pump damage, pipe blockage or leakage caused. For the use of belt-driven pump also consider whether due to belt slip caused by low speed caused by insufficient flow. After checking the belt to check the pipeline, the flow blockage is still inadequate leakage should consider whether the impeller damage. Check the impeller and bearings and other parts of the lubrication, to avoid poor lubrication due to poor lubrication or damage caused by insufficient flow. 4. Boiler feed pump system vibration failure to exclude boiler feed pump bearing system failure will result in insufficient flow, the pump heat, running sluggish and so on, one of the reasons for the failure is due to lack of lubrication or lubricating oil due to impurities , On the one hand the vibration of the unit will also cause the bearing system failure to increase. The vibration of the feedwater pump system has an important impact on the safety of the entire unit, seriously endangering the safe and stable operation of the unit, and the excessive vibration has an important impact on the unit and the foundation of the unit. In the event of excessive vibration of the unit is mainly due to the shaft or motor rotor shaft deformation, bearing damage and the base fixing bolts loose. Occurrence of unit vibration is too large, you should first check whether the fixed base bolt is solid, followed by checking whether the bearing parts overheating and poor rotation and so on. Such as over-the-line situation can be determined to cause excessive vibration caused by bearing damage. Excluding other reasons after the unit vibration is still, you can think of the shaft or motor rotor shaft deformation caused by excessive vibration. Deformation of the shaft of the pump shaft or the rotor of the electric motor is mostly a temporary deformation, which is caused by partial overheating caused by damage to the bearing of the unit. Can stop the temperature equilibrium deformation can disappear. Further Reading: pump valve pipe fittings Exhibition Water Expo Xiamen exhibition of marine equipment Internet + Forum Yiwu Fair 2016 exhibition mold top ten brands of the Internet information industry (Xiamen) Technology Co., Ltd. Author: Asian pumps Network Editor: Yao Xiaoxia (QQ / WeChat:) http://beng.liuti.cn/ (Service Hotline:)
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