Abstract

The solid injection system has many advantages, and it is the more remarkable when it is used for dynamo driving. In the case of ordinary air injection system, the quantity and pressure of the injection air as well as the fuel quantity must be controled at the same time when the load is changed. Otherwise, the engine will run out of order, and the parallel running will be broken. In the case of solid injection system, however, the only thing to be done is to control the fuel oil quantity. In this case, the fuel pressure must be kept nearly constant. For this purpose some makers use the automatic fuel injection valve. But, the author used a mechanically operated fuel valve and controled the pressure positively by mechanical means, for he thought this method would be more reliable. According to his design, the angle of fuel valve opening as well as the fuel pump are controled automatically by the governor. To find the relation between the fuel quantity and the fuel valve opening to keep the pressure constant, the coefficients of the nozzle of fuel valve and the fuel pump volumetric loss had been determined from some experiments. 6 sets of 535 B.H.P. engines of this system directly coupled to 350 K.W.A.C. generator were recently installed at "Yeiko" power station of Messrs. Chosen Water Power Plant Co. They are running very smoothly all in parallel producing totally 2,100 K.W. The fuel consumption is good and has a record of 183 gr. per B.H.P. per hour with raw grade Borneo heavy oil having the specific gravity ・95. The governor works so sensitively that it keeps the speed variation below 6% instantaneously at a sudden change of load from full to nothing and at about 1.5% after the speed is settled.