The engine speed of the natural gas compressor is unstable. Experts only >>>>>
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Natural gas reciprocating piston compressor. Three-stage compression. Caterpillar G3512 drive. The engine was set to operate at 960 RPM; after running for a while, the speed rose to 1000 RPM before dropping again, resulting in unstable operation. . . . I would like to ask what causes this. .
It should be driven by a gas turbine; the problem lies with the speed control valve, but the direct cause might be fluctuations in the control oil pressure of the unit or excessive fluctuations in the compressor load.
Could it be that there’s a problem with the voltage?
First, is there a problem with the gas control valve? Second, is it due to excessive changes in the gas inlet pressure? Is there also a problem with the set regulating current?
There could be two reasons: 1. Excessive fluctuations in the control oil pressure of the unit cause fluctuations in the control valve； 2. The control valve cannot keep up with the excessive fluctuations in compressor load.
Now the rotation speeds differ by 100 revolutions. It stops operating after running for a day, showing low lubricant pressure; increasing the lubricant pressure doesn’t help either.
The main reason is likely an excessive load; I encountered this issue in Inner Mongolia as well, with compressors of the 2RDSA type driven by G3512, featuring two-stage compression. The instability in operation varies depending on the season – the lower the temperature, the less the load.
There are several possible causes for this issue: (1) Poor ignition in the power cylinders of certain engines; (2) Inappropriate settings for parameters such as the engine governor’s gain and compensation values; (3) Unstable pressure at the engine’s fuel intake pressure regulator; (4) An inappropriate air-fuel ratio in the engine