Mitsubishi Heavy Industries Limited

Mitsubishi Heavy Industries Engine & Turbocharger, Ltd.

Michiyasu Ishida

Hideki Nishio

Satoru Murata

Hirotoshi Kitagawa

Hideaki Okumura

Kimihiko Maehata

Shoji Namekawa

Minoru Esaki

Kenjiro Oda

Sota Watanabe

Embodiments may provide a starting device for a gas internal combustion engine whereby non-combusted gas accumulating in the gas internal combustion engine and an exhaust channel is discharged before ignition startup of the gas internal combustion engine and abnormal combustion of the gas internal combustion engine is prevented so as to improve safety, breakage prevention, durability and reliability. A starting device of a gas internal combustion enginehaving an air starting deviceincludes a rotation-speed detection unit of the gas internal combustion engine, a compressed-air introduction unitfor supplying compressed air to each of cylinders according to an order of an ignition timing of the gas internal combustion engine, a compressed-air supply unitfor supplying the compressed air to the compressed-air introduction unit, and a control deviceincluding a cumulative rotation-speed setting devicewhereby an operator can set a threshold value of a cumulative rotation speed optionally, the control devicebeing configured to halt supply of the compressed air by the compressed-air supply unitif a set cumulative rotation speed is achieved on the basis of the rotation speed detected by the rotation-speed detection unit.

Starting device for gas internal combustion engine

An object of the present invention is to provide a gas leakage checking device and a method for the same, for checking fuel-gas leakage of safety shutoff valves simply and securely by measuring a pressure in a fuel supply pipe. The gas-leakage checking deviceincludes a first safety shutoff valvedisposed in a fuel-gas supply pipeof the gas internal combustion enginefor permitting or shutting off a flow of the fuel gas, a second safety shutoff valvedisposed on a downstream side of the first safety shutoff valve, a gas-leakage checking pipebranched from between the first and second safety shutoff valves, a gas-discharge valvedisposed in the gas-leakage checking pipeand configured to discharge the fuel gas between the first and second safety shutoff valves, a first pressure meter Pfor detecting a pressure of the fuel gas in the gas-leakage checking pipe, and second pressure meters P, Pdisposed on a downstream side of the second safety shutoff valve, for detecting the pressure of the fuel gas in the fuel-gas supply pipe

Gas internal combustion engine gas leak checking device and method for same

In particular embodiments, a starting device for a gas internal combustion engine whereby non-combusted gas accumulating in the gas internal combustion engine and an exhaust channel is discharged during ignition startup of the gas engine and abnormal combustion is reduced in the occurrence so as to improve safety, breakage prevention, durability and reliability. An exhaust purge device for a gas internal combustion engine, which operates using flammable gas as fuel, includes an exhaust channelforming an exhaust channel of the gas internal combustion engine, a blast pipeconnected to an upstream portion of the exhaust pipe at a first end, an exhaust purge fanconnected to a second end of the blast pipeand configured to send ambient air to the exhaust channel, and a control devicefor performing a control to drive the exhaust purge fan

Exhaust purge device for gas internal combustion engine

It is an object of the invention to achieve a stable idling revolution speed in a short time and to prevent easily the occurrence of abnormal combustion, misfire, or the like by effectively controlling a gas flow rate adjustment valve even in a case where a fuel gas which tends to fluctuate in fuel gas concentration, as represented by a coal mine gas, is used. The invention includes a revolution speed detection partdetecting the revolution speed of a gas engine, a gas concentration detection unitdetecting the gas concentration of a fuel gas, a gas flow rate adjustment valvedisposed in a fuel gas pipelinesupplying a fuel gas to the gas engine, a governor actuatorfor operating the gas flow rate adjustment valve, and an operation amount computation partcomputing the operation amount of the governor actuatoraccording to the gas concentration of the fuel gas detected by the gas concentration detection unit; and a governor controlleroperating the governor actuatorbased on the operation amount computed by the operation amount computation partis further provided.

Gas engine control device

Provided is a gas engine having a spark plug provided with a pre-combustion chamber and a check valve, the gas engine, in which the check valve is arranged in the neighborhood of the pre-combustion chamber, being capable of preventing adhesion of a solenoid controlled valve provided at an upstream side of the check valve due to soot accumulation, and dead volume in a fuel inlet passage. In a gas engine in which fuel gas is supplied to the pre-combustion chamber through the fuel gas inlet passage and the fuel gas supplied in the pre-combustion chamber is ignited by spark discharge at the spark plug that is fitted to a mounting hardware piece via a seat surface, a solenoid valve for performing open-close control of the fuel gas is provided, and a first check valve is also provided posterior to a discharge side of the solenoid valve so as to prevent back flow of the combustion gas from the pre-combustion chamber to the solenoid controlled valve.

Gas engine

Provided is a check valve structure capable of preventing soot accumulation in a check valve arranged in a pre-combustion chamber () due to incomplete combustion of fuel gas and preventing malfunction the check valve () for a gas engine having an pre-combustion chamber with a spark plug. An arrangement for supplying fuel gas to the pre-combustion chamber () has a multiple bore-cooling holes () disposed around the spark plug () for cooling a gasket () formed in a mounting hardware piece (), the holes having an lateral bore-cooling hole (), and a lateral bore-cooling hole () with the gasket () therebetween. Each of the holes further has a multiple bore-cooling holes () parallel to the center axis () of the spark plug. The mounting hardware piece () further has a check valve () communicating with a fuel gas inlet slot () between the lateral bore-cooling hole () (inlet side) and the lateral bore-cooling hole () (outlet side) for cooling water so that the check valve is cooled. A first check valve () is provided upstream of a fuel gas inlet location (the junction) () of the mounting hardware piece () with respect to the fuel flow to prevent reversed flow of fuel gas.

Growing community of inventors

Tokyo, Japan

Michiyasu Ishida