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Daily maintenance measures of water pumps for multi-stage boilers

11 Jun 2021Email

The operating efficiency of modern boilers water pumps is the focus of troubleshooting. For the daily failure prevention and maintenance of the equipment, the minimum flow valve must be controlled well. During the operation of the feed water pump, the normal operation and safe maintenance of the water filling pump must be ensured.

(1) First of all, we must establish a scientific and reasonable system guarantee system and maintenance system. Through scientific guidance on the operation of multi-stage boilers pumps, the level of component failures in the operation of the equipment should be divided, detailed records, and wear conditions Carry out analysis by category to ensure that the service life can be improved through maintenance work. Make timely inspections and replacements so that the entire unit can operate normally. Strengthen the maintenance of the lubrication system of the feedwater pump, frequently check whether the amount of lubricating oil is maintained at a normal level, and carry out regular maintenance and inspection of the bearings to ensure that the bearings operate normally and will not malfunction due to wear. Before carrying out the lubrication inspection of the equipment, it is necessary to determine the quality of the lubricating oil and the safety of the oil quality, and clean the addition port to prevent the system from being paralyzed due to the entry of impurities during the addition process and destroying the operation of the bearing.

(2) In the daily maintenance of the boiler equipment, attention should be paid to the inspection of the pipes of the water pumping system to avoid pipe blockages and prevent leaks from occurring in the anti-rust coating on the outside of the pipes. Spalling occurs and it is easy to cause leakage. Therefore, it is necessary to regularly spray paint to ensure the corrosion resistance of the pipeline, ensure unobstructed flow, and improve the working efficiency of the boiler feed water pump. At the same time of maintenance, regular inspections of the water source treatment system should be carried out to ensure that the safety of the system starts from the source.

(3) For the troubleshooting and treatment of the air leakage fault, the technician uses a sealing sleeve to seal, and starts the welding operation next to the vent hole of the top cover of the coupler, and connects the inlet of the vacuum oil filter to the outlet of the oil discharge pipe at the bottom of the coupler The tube is bundled at the opening to form an oil filter circuit structure. For the case where high pressure water cannot enter the bearing chamber due to too low pressure, use a sealing ring to fasten the outside of the sleeve, leaving a breathing hole exposed. Welded stainless steel pipe (length is about 15mm, diameter is about 45mm), the end welding method is difficult to connect with the stainless steel pipe, supplemented by PTFE gasket for paving. Designed according to this principle, water cannot enter the bearing chamber in a sealed state, and even a small amount of sealing water leakage is normal. However, if there is still serious water leakage in the sealed state, the reasons for this situation are that the pressure of the sealing water supply is too large, and the water vapor formed at high temperature enters the bearing chamber and mixes with the oil under the action of high pressure. Another possibility is that the performance of the sealing water regulating valve is poor and the pressure difference is not accurately measured. When the return water volume increases, there is no timely alarm, resulting in a large amount of return water not being processed in time.

(4) During the inspection, the staff found that the water in the multi-stage boiler water pump is easily absorbed by the exhaust device, causing internal negative pressure. After obtaining the design drawings for research, the explanation for this situation may be due to serious defects in the design of the water seal structure at the design stage. The original multi-stage water seal was arranged on the ground of the machine room, and the outlet pipeline was located at 2m. There are many places, but the elevation of the return pipe is only less than lm, and the probability of negative pressure forming in the drainage process is very high. As a result, the water cannot be smoothly sucked into the exhaust device, and the leaked water is discharged to the trench, causing a lot of waste of salt water. The multi-stage pump can be designed as a four-stage series structure to ensure that the total height of the multi-stage pump is higher than the height of the vacuum water column in the exhaust device. The rabbit avoidance design is too simple, resulting in poor stability of the water seal, for example, the degree of each stage is less than 2m, once the first-stage water seal is destroyed, the remaining water seals will be difficult to escape. The troubleshooting and treatment of multi-stage pump faults must be to ensure that the air is blocked and drained. The air is isolated above the water surface of the multi-stage water seal and the seal is smoothly sealed. Water is sucked into the exhaust device and the balance between the two is maintained, so that the water at the bottom of the multi-stage water wind can flow into the exhaust device.

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