OPERATION METHOD FOR RECIPROCATING INTERNAL COMBUSTION ENGINE AND SYSTEM THEREOF

摘要

PROBLEM TO BE SOLVED: To provide an internal combustion prime mover system capable of increasing a fuel injection amount while keeping a maximum combustion temperature in a cylinder at a conventional level to increase an output and improve thermal efficiency and reducing an NOx exhaust level simultaneously. SOLUTION: A feedback compound system for a reciprocating internal combustion engine is constituted in such a way that a heat exchanger is provided in an exhaust air rear stream from an exhaust turbine provided on the rear stream side of an exhaust collective pipe of the reciprocating internal combustion engine with an exhaust supercharger to generate subcritical water having pressure of 18 MPa or more and a critical point or less and a temperature of 250 deg.C or more and 500 deg.C or less or supercritical water having pressure exceeding the critical point and a temperature exceeding a critical point and of 500 deg.C or less by heat exchange with water supplied into the heat exchanger and the generated subcritical or supercritical water is injected into the cylinder within a scope of 90 deg. before a top dead center to 30 deg. after the top dead center to inject fuel so that an air excess rate becomes 1 to 2.5 and the maximum combustion temperature becomes 1,600 to 2,000 deg.C when the maximum output is obtained.