The engine power of biogas generator set is insufficient and the speed is uneven. There are thick black smoke in the exhaust pipe. There are two kinds: one is black smoke in the continuous exhaust pipe; the other is intermittent black smoke and engine vibration.
The lack of engine power and continuous emission of black smoke are caused by excessive oil supply in most or all engine cylinders, mixture of misportion fuel and air. During severe anoxic combustion, diesel combustion is incomplete, and the formation of free carbon elements together with the emission of exhaust gas is suspended. If the exhaust pipe emits black smoke intermittently with a "beep" sound, it means that the combustion of individual cylinders is incomplete. The reasons are as follows:
(1) the fuel injection pump is not adjusted properly, resulting in too much oil supply and incomplete combustion.
The injection quality of most syringes is poor.
There is not enough oil supply.
(4) the opening height of the intake valve is low and the opening time is delayed, resulting in insufficient intake.
The air filter element is too dirty or the air filter is installed incorrectly, which makes the air not smooth.
6. Poor fuel quality.
7. Booster efficiency decreases.
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