| 摘要 |
The engine cylinder 20 has an intake 22 which receives a biogas-air mixture from carburettor 24. An acid-neutralizing lubricating oil is supplied to the intake 22 by pump 34 from reservoir 36 each time the ignition is switched off to prevent corrosion of the engine by acid residues when not in use. A timing circuit connected to the ignition system energises the pump 34 and keeps the engine turning for three seconds to ensure that all the cylinders are coated with the oil. Hydrogen sulfides and mercaptans are removed from the biogas by filter 50 and water vapour is removed by a coalescer 44. The filter may take the form of two 208 litre drums mounted on a wooden skid and filled with a porous medium through which the biogas flows from top to bottom. |
