FUEL GAS SUPPLY METHOD AND DEVICE FOR GAS ENGINE

摘要

The present invention is characterized in that in a gas engine in which a gas supply pipe (35) branches into a supercharger-side gas supply pipe (33) and a cylinder-side gas supply pipe (37) and which is provided with a supercharger-side gas quantity adjustment valve (43) and a cylinder-side gas quantity adjustment valve (45) which control the flow rates in the passages of the respective gas supply pipes, when the concentration of fuel gas is changed, while the ratio (Q1/Q2) between the fuel gas quantity (Q1) of the supercharger-side gas supply pipe (33) and the fuel gas quantity (Q2) of the cylinder-side gas supply pipe (37) has a constant relationship, a gas supply controller (63) first controls the cylinder-side gas quantity adjustment valve (45) so as to maintain a constant engine output, and then controls the supercharger-side gas quantity adjustment valve (43) so as to achieve the fuel gas quantity (Q1) based on the constant ratio.