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Diagnosis of abnormal vibration of the exhaust gas turbine of the air compressor unit.
Li Hua Abstract uses the Tuo predictive maintenance system to periodically monitor the operating status of the air compressor unit, analyze and diagnose the cause of the turbine turbine vibration fault and take corresponding measures to make the unit run smoothly.
This indicates the role of predictive maintenance technology in equipment management.
Key words predict maintenance monitoring vibration fault diagnosis air compressor unit from the main steam turbine (position number one) to drive high and low pressure compressor work, plus tail gas turbine (position number is auxiliary drive equipment.
From the beginning of the year, we used the American Science Corporation Computerized Predictive Maintenance System (referred to as the system) to perform offline periodic operation monitoring of the unit.
In the first month of the year, it was found that the turbine turbine vibration increased, and tracking monitoring was performed thereafter.
The schematic diagram of the unit and the position of the measuring point are as shown in Figure 1. The parameter setting of the unit is established. According to the requirements of the system, the relevant data of the unit is input into the computer, and the unit diagram and measuring point arrangement table of the unit is established. The t parameter sets the appropriate measurement parameters, and the computer transmits the detection path to the data collector.
Parameter setting monitoring situation Exhaust gas turbine rotor has been set by parameter name parameter unit measuring point identification measuring direction horizontal vertical machine speed eight seedling signal input mode one measuring quantity and unit displacement worship m signal type peak-peak calibration coefficient maximum frequency printing ratio The number of spectral lines ç²¼X) the average number of window function types Haning blade fracture and other reasons have been repaired several times, and then stopped due to poor operating conditions.
The replacement of the imported rotor in the year and month is not very satisfactory.
As the operating conditions change, the vibration amplitude is always between 27 and a mix.
On the day of the month, the vibration amplitude of the measuring point reached the level and the monitoring was strengthened.
The vibration spectrum of the year, month and day is shown in Figure 36.
Day X Wei].
From the spectrum diagram, the vibration is mainly based on the power frequency, the frequency of the double frequency component is obvious, and there are high-order harmonics.
Combined with the actual operation of the unit, it is believed that there are two main reasons for causing abnormal vibration.
The rotor is unevenly loaded. The rotor has been strictly tested before installation. The indexes are excellent. The full-speed dynamic balance accuracy is good and the maintenance is always good. There is no inherent imbalance and permanent bending deformation of the rotor.
The installation quality meets the requirements.
This shows that the machine itself is in good condition.
Since the top inlet valve of the unit level cannot be opened due to the process, the intake air mainly depends on the bottom nozzle, so the rotor is unevenly stressed during operation and is unbalanced.
(2) Poor alignment of the machine connection The unit is all connected by a toothed coupling. One of the advantages is that when the coupling has a slight misalignment during operation, it has a certain compensation and adjustment function.
However, when there is a large angle misalignment, the axial force and the positive contact pressure of the tooth surface contact point are formed on the contact surface of the tooth. When the torque is transmitted, the tooth surface is relatively slipped and the friction occurs on the rotating coupling. Force, which causes self-excitation, resulting in rotor instability.
Generally, the coupling will normally have parallel misalignment and misalignment at the same time, and the toothed coupling is due to its structural characteristics and connection form, even if it is parallel misalignment, but the inner and outer sleeves and the toothed case are fastened. After that, it still shows that the angle is not right.
The unit has been in operation for many years and has been using the cold calibration standard data provided by foreign companies. Due to the deformation of the casing, etc., the vibration diagnosis method for the diesel engine knocking cylinder failure has not been managed by Chinese equipment. Zhang Zhiqin, Wang Honghai, Yuan Weibao Abstract This paper proposes a method for judging the knocking failure of a cylinder by measuring and analyzing four characteristic parameters during the operation of the diesel engine.
Key words vibration diagnosis method knocking cylinder diesel engine diesel engine knocking cylinder is a common fault, the causes are more complicated, generally have the following.
Excessive fuel injection advance angle, excessive accumulation of diesel fuel in the combustion chamber during the combustion period, causing rough combustion (2) excessive oil supply of individual cylinders and dripping of fuel injectors, poor atomization) clearance between cylinder and piston Large, the piston hits the cylinder wall during the movement.
The knocking cylinder failure not only exacerbates the vibration but also shortens the life of the diesel engine.
Under normal circumstances, you can find the knocking fault by listening to the sound. In some occasions, such as the engine room of the locomotive diesel engine, it is difficult to distinguish whether the knocking has occurred, and certain testing and diagnostic methods are needed.
The vibration diagnosis method is an effective method for diesel engine fault diagnosis by testing and analyzing the vibration signal during the operation of the machine to determine the operating state of the machine.
A knocking cylinder fault vibration analysis Diesel engine is a complex dynamic mechanical machine. The internal rotary motion and the reciprocating motion have both gas pressure and inertial force and friction.
The following forms of excitation response are included in the measured cylinder head vibration signal.
(1) The effect of gas combustion expansion on the cylinder head and the cylinder block. The bow piston knocks the cylinder. The piston crosses the cylinder wall. The valve mechanism sports impact. Other mechanism excitation and some random excitation.
Among them, the lateral impact of the piston on the cylinder wall is the main incentive for the knocking of the diesel engine.
It can be seen from the figure that due to the existence of the gap between the cylinder and the piston, when the piston moves over the top dead center to the bottom dead center, it hits the cylinder wall under the action of the side pressure.
It can keep the unit in optimal operation.
It can be seen from the spectrogram that the second-frequency component is obvious, and the poor alignment is also one of the main causes of the vibration.
According to the above analysis, the measures taken by the three have taken two corresponding measures.
Carry out process modification.
Improve the heat transfer conditions, so that the intake air temperature meets the process requirements, so that the upper and lower parts of the equipment are simultaneously inhaled, and the rotor tends to be evenly distributed to reduce the power frequency vibration component.
Since the cold part has been re-determined, the unit operation tends to be stable, the amplitude is reduced, and the double-frequency component is also significantly changed. After the adjustment, the tail gas turbine vibration spectrum meter unit is cold-corrected and the factory is adjusted before the adjustment.
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Factory entry.
Face-to-face one-on-one and one less trembling (the soil position is looking for positive data.
According to the thermal deformation of the unit, the cold calibration data is calculated to improve the hot state alignment.
After the maintenance and renovation of the four units, the operating conditions have decreased since the year and the expected results have been achieved.
The spectrum is shown in Figure o3 Reference Entek Predicted Maintenance System Operation Manual.
Entek Science Company Li Yuwen and so on.
Principles and techniques for the diagnosis of electromechanical equipment.
South China University of Technology Press.
Shen Qinggen.
Chemical machine fault diagnosis technology.
Zhejiang University Press.
Author unit Yangzi Petrochemical Co., Ltd. Chemical Plant Mobile Co., Ltd. Address: Nanjing, Jiangsu Province, China Postcode China Equipment Management
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