What are the common faults of nitrogen compressors?

2019-11-08

Abnormal temperature Exhaust temperature abnormal means it is higher than the design value. Theoretically, the factors that affect the increase of exhaust gas temperature are: intake air temperature, pressure ratio, and tightening index (about air tightening index K = 1.4). Factors that affect the high suction temperature in actual conditions are as follows: low intercooling power, and maybe the scale in the intercooler affects heat transfer, the suction temperature of the rear stage must be high, and the exhaust temperature will also be high. In addition, air leakage from the valve and air leakage from the piston ring not only affects the increase in exhaust temperature, but also changes the interstage pressure. As long as the pressure ratio is higher than normal, the exhaust temperature will increase. In addition, for water-cooled machines, the lack of water or the lack of water will increase the exhaust temperature.
Abnormal pressure The amount of gas discharged from a nitrogen compressor cannot meet the user's flow requirements under additional pressure, so the exhaust pressure must be reduced. At this point, another machine with the same exhaust pressure and large exhaust volume had to be replaced. The main reason that affects the abnormal pressure between stages is the air leakage of the valve or the wear of the piston ring, so we should find the cause and adopt measures from these aspects.
Abnormal sounds If some components of the nitrogen compressor fail, abnormal sounds will be announced. Generally speaking, the operator can discern abnormal sounds. The gap between the piston and the cylinder head is too small, and they directly hit; the connecting rod of the piston rod and the piston is loose or tripped; the end face of the piston is blocked, and the piston moves up and hits the cylinder head; metal fragments fall into the cylinder and water is accumulated in the cylinder All can be announced in the cylinder. The crankcase bolts, nuts, connecting rod bolts, crosshead bolts in the crankcase are loose, tripped, broken, etc., the shaft diameter is severely worn, the gap is increased, the crosshead pin and the bushing are too large, or the wear is severe, etc. The impact was announced inside the crankcase. The exhaust valve disc is broken, the valve spring is soft or damaged, the load regulator is not adjusted properly, and so on. It can be announced in the valve cavity. Find faults and adopt measures.
Overheating faults Crossheads, slides, packings, piston rods, etc., where the temperature exceeds the rule is called overheating. The result of overheating: one is to accelerate the wear between the friction pairs, and the other is the continuous accumulation of overheating heat energy to burn the friction surface and cause serious machine accidents. The main causes of overheating of the bearing are: uneven contact between the bearing and the journal or too small contact area; deflected bearing crankshaft, lubricating oil viscosity is too small, the oil circuit is blocked, the oil pump is faulty, and the oil is broken. , Did not find a good gap, the main shaft and the motor shaft are not aligned, the two axes are skewed and so on.

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