| 摘要 |
The present invention relates to an EGR system of a natural gas engine. According to the present invention, the EGR system of a natural gas engine comprises: a turbo charger (10) comprising a turbine (11) rotated by exhaust gas combusted in an engine (1) and discharged through a first exhaust gas pipe (21), a rotary shaft (12) connected to the center of the turbine (11), and a compressor (13) to share the rotary shaft (12) with the turbine (11) and compress air sucked from the outside; and a recirculation pipe (40) to recirculate the exhaust gas passing through the turbine (11) from a second exhaust gas pipe (22) to a first intake air pipe (31) on the front end of the compressor (13). According to the present invention, the EGR system of the natural gas engine recirculates the exhaust gas from the front end of a postprocessing device, and comprises the asymmetric turbo charger whose turbine has a larger diameter than the diameter of the compressor to increase recirculation rate and intake efficiency. |
