Engine-driven electricity generation system using diesel engine from scrapped vehicle capable of using both diesel and lng

Abstract

The present invention relates to an engine-driven electricity generation system and, more particularly, to an engine-driven electricity generation system that can selectively use diesel and LNG as fuel by recycling a diesel engine from a scrapped vehicle. The engine-driven electricity generation system according to the present invention heats intake air with an electric burner to start an engine using LNG and then heats the intake air using heat from a high-temperature exhaust gas after starting the engine, thereby accelerating ignition of LNG. Accordingly, it is possible to use both diesel and LNG in a scrapped diesel engine.

What is claimed is: 
     
         1 . An engine-driven electricity generation system using a diesel engine from a scrapped vehicle capable of using both diesel and LNG, the system comprising:
 a scrapped diesel engine obtained from a scrapped diesel vehicle;   a power generator connected to the scrapped diesel engine and generating electricity;   an LNG tank keeping LNG as fuel for the scrapped diesel engine;   a diesel tank keeping diesel as fuel for the scrapped diesel engine;   an intake pipe for in-taking external air and then supplying the intake external air to the scrapped diesel engine;   an exhaust pipe for discharging an exhaust gas produced by operation of the scrapped diesel engine to the outside;   an electric burner heating intake air flowing through the intake pipe to firstly start the scrapped diesel engine when LNG is used as fuel for the scrapped diesel engine;   a heat exchanger heating the intake air flowing through the intake pipe by restoring a exhaust gas discharged through the exhaust pipe after the scrapped diesel engine is started; and   a controller controlling entire operation.   
     
     
         2 . The system of  claim 1 , wherein the LNG tank and the diesel tank are connected to an injector in the scrapped diesel engine through an LNG supplying pipe and a diesel supplying pipe, respectively, and a 3-way valve is disposed at an intersecting joint of the LNG supplying pipe, the diesel supplying pipe, and the injector. 
     
     
         3 . The system of  claim 2 , wherein when LNG is selected as fuel, the controller controls the 3-way valve to supply LNG to the injector in the scrapped diesel engine, and operates the electric burner to heat the intake air. 
     
     
         4 . The system of  claim 3 , further comprising:
 an engine start-sensing unit sensing whether the scrapped diesel engine has been started; and   a first solenoid valve disposed in a first heat exchange pipe connecting the exhaust pipe and the heat exchanger,   wherein when the engine start-sensing unit senses that the scrapped diesel engine has been started, the controller stops operation of the electric burner and opens the first solenoid valve so that an exhaust gas discharged through the exhaust pipe is supplied to the heat exchanger and thus heats the intake air flowing through the intake pipe.   
     
     
         5 . The system of  claim 1 , wherein the exhaust pipe and an oil pan coupled to the bottom of the scrapped diesel engine are connected through a second heat exchange pipe so that the oil pan is heated by an exhaust gas discharged through the exhaust pipe, and the second heat exchange pipe diverges from the exhaust pipe, turns around the outer side of the oil pan, and then returns to the exhaust pipe.