Boiler feed pump is related to the safe and stable operation of the boiler system is the key to the use of modern automatic control technology to design and set up the boiler automatic level control system is an important part. At present, China has more than 400,000 sets of boiler equipment, most of which are boilers for industrial enterprises and boiler systems for power plants. A small part is used in commercial areas such as residential bathhouses. The basis for the steady operation of the feedwater boiler during operation of the boiler is an important part of the modern boiler 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 the routine maintenance and repair of the boiler system feed pump has become an important work of the modern boiler maintenance department.

1 to the failure prevention-based daily maintenance

The daily maintenance of the modern boiler feed water pump must take fault prevention as the goal and establish a scientific maintenance system and system to guide the daily maintenance work of the feed water pump. 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. In addition, but also to strengthen the pump lubrication system maintenance, regular inspection of the amount of lubricant, lubrication of parts in a timely manner to avoid "dry grinding" and so on. Lubricant before adding to pay attention to check the oil and add cleanliness of the mouth, to avoid adding impurities into the bearing damage. In the conservation should pay attention to the feed pump system piping inspection and maintenance, timely leakage of plugging, rust-proof coating on the outside of the pipeline should always be inspected on the coating spalling timely spraying, in order to ensure that the tube Road corrosion resistance. Maintenance also need to pay attention to the pump water treatment system inspection and maintenance.

2 boiler feed pump failure analysis and troubleshooting

2.1 boiler feed pump analysis and troubleshooting

2.1.1 Electric Feed Pump Motor Overheating Analysis and Troubleshooting For the use of motor-driven feed pump, the most common fault is the motor 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.

2.1.2 feed pump overheating boiler feed pump pump overheating common cause is due to friction caused by damage to the bearings, 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 axis is not the same heart, at the same time 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

2.2.3 Boiler Feed Pump Flow Boiler Feed Pump flow mainly due to pump damage, pipeline 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.

2.2 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 increase of bearing system failure. 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.

3 boiler feed pump failure reason analysis

Modern large boiler feed pump system consists of multiple feed pumps, from two to three start to feed the main pump, one or two electric feed pumps as a backup or auxiliary. Such a feed pump configuration is conducive to the feed pump host system failure or can not meet the boiler operation needs, start standby feed pump system inadequate to avoid due to feed pump failure caused boiler downtime. 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. Through the scientific analysis and troubleshooting of the cause of the trouble to find out and solve the boiler feed pump basis, only to eliminate the cause of the malfunction in order to avoid the recurrence of the same type of fault. The following types of causes of different types of exclusion, etc. are discussed.

Boiler feed pump is the basis of safe and stable operation of boiler. With the application of automation technology in boiler feed water, the modern boiler level automatic regulation system has become the key to safe and stable operation. In recent years, due to boiler feed pump failure caused by downtime of the boiler is common, the reason is that the equipment maintenance department did not properly grasp the cause of the boiler feed pump failure.

Boiler feed pump is an important part of modern boilers, the boiler safe and stable operation has an important impact. Therefore, the boiler maintenance and management department must pay attention to the boiler feed pump system maintenance and management, to prevent the problem for the purpose of scientific conservation, with the replacement of the service life of the parts in time to avoid damage to the components caused by the larger damage. The establishment of feed pump system maintenance records, according to the boiler operation and record of scientific analysis, to determine the replacement time, in order to protect the feed pump system stable operation. This requires the maintenance department to strengthen the training of professional and technical personnel, requiring professional and technical personnel not only have a high boiler feed pump expertise and skills, but also with modern equipment management concepts and methods. With scientific management and a high level of professional skills to ensure the safe and stable operation of the boiler.

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