Analysis and treatment of anomalous phenomenon of air compressor vibration indication

On February 15, 2010, 254, Fangda Special Steel Technology Co., Ltd. 16300 chemical air separation unit supporting the operation of the air compressor 78 vibration value suddenly produced a large fluctuation from 6.7141 to 2,317,0, and then fluctuated Appeared, the 527600 fluctuated especially frequently up to 38μm. In order to check whether the vibration detection circuit is normal, the instrument maintenance personnel connected the 8 sensor to the Ding 1007 transmitter, and the vibration value returned to stability. However, on the day 18, the original 008 measurement position of the original 007 display position has an abnormal finger, sometimes 2 occurrences, sometimes occur frequently, resulting in unequal spikes or irregular clutter for several minutes.

In 2400, there were 4 fluctuations in succession; on February 17th, the fluctuation of 2200 occurred for 6 minutes and the other time was stable at other times; on February 18, 322 352, the vibration value of this point appeared frequent fluctuations, and 17491752 appeared short-term continuous fluctuation, and 1952 appeared. The 42μm sharp wave, close to the vibration alarm vibration parameter is the main technical parameter for monitoring the operation of the air compressor. When the parameter exceeds the specified alarm stop value, the control system will issue an alarm interlock stop signal to ensure the safe operation of the air compressor. The air pressure GM general machinery 2010 machine is equipped with 8 sets of vibration detecting devices, the purpose of which is to comprehensively monitor the vibration of each axis of the air compressor, wherein the 007008 is the vibration value of the 17-axis. From the operation of similar air compressors, if the mechanical equipment does ask, the detected axis is not abnormal in the direction of the shaft, and the direction of 7 should also change, but the current situation is that only the vibration value is abnormal, which is a kind Abnormal signal. The abnormal vibration value of the air compressor has an intensified trend. This wrong signal not only affects the normal monitoring of the operating parameters of the air compressor, but also may cause the production chain to break due to the interlocking shutdown. To this end, the special organization of relevant professionals from the electromechanical instrument and process and other aspects of the analysis, and finally found the detection flow path that causes the vibration measurement of this phenomenon instrument system is the sensor vibration transmitter, 08 system, air compressor vibration signal cable For the same batch to be placed in parallel, the control cabinet of the 03, after the replacement of 1008 and 007, the flow detection system of the Ming vibrating transmitter 003 system is normal, and the question may only appear on the sensor. If the sensor is loose and damaged, it is impossible to just have an abnormal finger. The sensor is installed inside the air compressor. The sensor should be inspected only when the air compressor is stopped and the cover is removed.

When the vibration value of the lubrication system and the mechanical system is abnormal, the oil temperature and oil pressure bearing temperature and other shaft displacements are all stable values, and the fuel tank heater smoke exhauster works normally; the cooling water flow cooling water water temperature cooling water return water temperature It is also relatively stable and there are no abnormalities.

The process system analyzes the operation of the air separation system. The main factors affecting the operation of the air compressor are the air compressor suction pressure, the intake air temperature, and the air filter resistance. The molecular sieve system is in the charging stage. The molecular sieve system is in the heating stage. When the vibration value is abnormal, the air compressor suction pressure and the air temperature air filter resistance are relatively stable. When the molecular sieve system is pressurized, the air volume of the air compressor will increase; when the molecular sieve system is in the heating stage, the electric heater starts to work and increases the grid load; but from the operating point of view, no matter which stage of the molecular sieve system is in, vibration occurs. The value is abnormal. The factors causing abnormal vibration values ​​due to the air separation process can be basically eliminated.

The air compressor of the air distribution sleeve of the electrical system 300 is a power supply high voltage synchronous motor 88, and a 35 kV high voltage substation specially provided for the air separation is provided inside the oxygen plant. From the electrical background record, the operating voltage of the power supply voltage is very stable; contact with the company's power plant to know that there is no other large power load on the 16300 air-divided power transformer circuit.

The internal power supply on February 14th 540, with 163, the outer space is arranged side by side to run a set of 3 air separation 1 transformer, so the 000m3h empty distribution set of 2s transformer power supply. L2 transformers are alternately powered, and are powered by 47 power supply open circuits. The 16303 air separation is not the power supplied by the main road. From the perspective of the power grid, it will not affect the air compressor operation of the 16300 air separation configuration. 1 Before the transformer fails, its power supply only includes 1 process argon pump of its own unit, 1 stage, 1 pass 甩 mechanical pump 3 cooling water pump 18 expansion machine oil pump air compressor auxiliary oil pump air compressor smoke exhauster oxygen hood and Lighting and air conditioning in the main control building. The lighting and air conditioning of the main control building are normal, and the probability of affecting the abnormal fluctuation of the vibration value is relatively low.

5. Analysis of the law of abnormal values ​​of values ​​From the time when the vibration value anomalies occur in a few days, although it sometimes appears in a few hours, it occurs in the afternoon from 5 pm to 6 am, during which only the change is to increase the illumination. There are mainly the lighting of the main building of the air compressor room, the air separation tower area and the road of the factory area. For this reason, through the test, it is found that as long as the illumination of the air separation tower area does not open, the abnormal vibration value disappears.

There are more than 40 lights in the 300m3h air separation tower area. The working voltage of the reflective high-pressure sodium lamp is 220, divided into 5 circuit breakers, and the 4-core cable is used to supply the phase line power. After checking, there are 2 lights that are constantly flashing, and only the blue light is constantly flashing, and only the yellow and blue light is flashing. When the bulb that is constantly flashing blue light is removed, the abnormal vibration value still exists. When the bulb with the flashing yellow and blue light is removed, the abnormal vibration value disappears. The bulb keeps flashing, and the electronic trigger matched with the bright reflective high-pressure sodium lamp is constantly triggering the work. The bulb with the flashing yellow and blue phase light is about 40 high in the air separation cold box, and the linear distance from the air compressor is at least 70, the air compressor is installed. In a soundproof room with a metal inner casing, the vibration measuring sensor is mounted inside the air compressor and has a multi-layer metal shield. The probability that the electronic trigger triggers the light emitted by the bulb to directly affect the vibration value is extremely low. For reference, the configured electronic trigger generates a certain high-frequency harmonic to the line when it is triggered, and the harmonic cannot be The trigger itself absorbs. What causes the vibration measurement system to receive this high-frequency harmonic, check the direction of the lighting power supply line in the air-divided tower area, and find that the power line borrows the segment cable bridge. There is an abnormal change in the vibration value, which is likely to be the influence of high-frequency harmonics on the lighting line. For this reason, the temporary power line is separately discharged to supply the light of the flashing yellow-blue phase light. After the test, the vibration value is no longer abnormal. occur.

That is to say, under the specific conditions of the electronic trigger of the reflective high-pressure sodium lamp triggering the flashing of the bulb and the coexistence of the electric line and the relatively sensitive vibration measuring device, the vibration value is abnormal, as long as the item is avoided, the abnormal phenomenon is disappear.

In the engineering design, the electrical circuit is required to be isolated from the signal line of the instrument. However, in actual construction, there is a certain difficulty in truly completely isolating. Of course, there are also factors that do not pay enough attention to the isolation of the low-voltage electrical circuit and the signal line. Through the analysis of this example, the author has a little experience that the design unit supervision unit should emphasize the electrical line and the signal signal line in the design supervision. The construction unit should strictly follow the technical requirements to avoid the mixed line of electrical lines and instrument signals. The phenomenon is especially parallel, or take relevant measures such as shielded cable for power line, reduce interference through cable shield; use 2-core cable for single-phase power, reduce interference caused by phase imbalance; use maintenance personnel in equipment When there is a question, only by expanding the thinking, we can find out that the problem is separated as soon as possible, and the vibration value of the air compressor is restored to stability. However, why the lighting circuit only affects the vibration value of the midpoint, which is limited to the author's level, and cannot be further explored theoretically. Here, we only introduce the analysis process, and hope to learn from similar situations.

3, 1 pass. Using machinery

I:Summany

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