US 12,345,213 B2
Gas supply system for a gas engine or dual-fuel engine and method for operating the same
Björn Dirumdam, Ellgau (DE); and Thomas Lindermayr, Motzenhofen (DE)
Assigned to MAN Energy Solutions SE, Augsburg (DE)
Filed by MAN Energy Solutions SE, Augsburg (DE)
Filed on Jun. 18, 2021, as Appl. No. 17/351,599.
Claims priority of application No. 10 2020 116 222.7 (DE), filed on Jun. 19, 2020.
Prior Publication US 2021/0396187 A1, Dec. 23, 2021
Int. Cl. F02D 19/06 (2006.01)
CPC F02D 19/0621 (2013.01) [F02D 19/0628 (2013.01); F02D 19/0642 (2013.01); F02D 19/0681 (2013.01); F02D 2200/0602 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A gas supply system for an engine having cylinders that is designed as a gas engine or a dual fuel engine, comprising:
a gas regulating station configured to supply the engine in a gas fuel operating mode with a gaseous fuel of constant gas pressure as a function of a requested engine output;
a double-walled gas line extending from the gas regulating station to the cylinders, which comprises:
an inner pipe having an uninterrupted surface with outlets only at its axial ends;
an outer pipe having an unobstructed interior space defined by an outer surface of the inner pipe and an inner surface of the outer pipe, which surrounds the inner pipe at least in sections so that the inner pipe is separated from the outer pipe; and
a check valve, only in the inner pipe, provided at the engine-side end radially within the double-walled gas line that is configured to provide a flow towards at least one vent line,
wherein in the gas fuel operating mode of the double-walled gas line, emanating from a gas regulating station-side end of the double-walled gas line, the outer pipe can be flowed through by the gaseous fuel towards an engine-side end of the double-walled gas line,
an inert gas purging line;
a first shut-off valve connected to the inert gas purging line,
wherein in a purging mode of the engine, with the first shut-off valve in an opened state, an inert gas can be fed via the inert gas purging line to the outer pipe of the double-walled gas line at the gas regulating station-side end of the double-walled gas line, the inert gas flows through the outer pipe towards an engine-side end of the double-walled gas line, where the inert gas passes into the inner pipe and, via the inner pipe, flows back towards the gas regulating station-side end of the double-walled gas line where the inert gas then exits.