| (11) | EP 2 639 440 A1 |
(12) | EUROPEAN PATENT APPLICATION |
published in accordance with Art. 153(4) EPC |
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(54) | ENGINE EXHAUST GAS PURIFICATION DEVICE |
(57) Provided is an engine exhaust gas purification device which reduces or eliminates the electric power required for raising the pressure of exhaust gas recirculation (EGR) gas extracted from the upstream side of an exhaust gas turbocharger to be used for EGR after cleaning processing by an exhaust gas cleaning unit. An engine exhaust gas purification device (1) for reducing and eliminating air pollution substances contained in exhaust gases discharged from a main engine (10) equipped with an exhaust gas turbocharger (20) includes an exhaust gas cleaning unit (70) that cleans a portion of the exhaust gases introduced as an EGR gas from an exhaust line (L1) located at the upstream side of a turbine unit (21) of the exhaust gas turbocharger (20), and a recirculation exhaust gas turbocharger (60) that raises the pressure of the EGR gas which is caused to pass through the exhaust gas cleaning unit (70) by a recirculation compressor unit (62) coaxial with the recirculation turbine unit (61) which is dispose at the upstream side of the exhaust gas cleaning unit (70) and is driven by using the EGR gas. |
{Technical Field}
{Background Art}
{Citation List}
{Patent Literature}
{PTL 1}
Publication of Japanese Patent No. 3304090
{PTL 2}
Japanese Unexamined Patent Application, Publication No. 2002-332919
{Summary of Invention}
{Technical Problem}
{Solution to Problem}
{Advantageous Effects of Invention}
{Brief Description of Drawings}
{Fig. 1}
Fig. 1 is a schematic diagram showing a structure of a first embodiment of an engine exhaust gas purification device according to the present invention, which is incorporated mainly in an intake/exhaust system of a main engine for ships.
{Fig. 2}
Fig. 2 is a schematic diagram showing a structure of a second embodiment of an engine exhaust gas purification device according to the present invention, which is incorporated mainly in an intake/exhaust system of a main engine for ships.
{Description of Embodiments}
{Reference Signs List}
an exhaust gas cleaning unit that cleans a portion of the exhaust gases introduced as a recirculation exhaust gas from an exhaust line located at the upstream side of a turbine unit in the exhaust gas turbocharger; and
a recirculation exhaust gas turbocharger disposed at the upstream side of the exhaust gas cleaning unit for raising the pressure of the recirculation exhaust gas which is caused to pass through the exhaust gas cleaning unit by a recirculation compressor unit coaxial with a recirculation turbine unit driven by using the recirculation exhaust gas.
REFERENCES CITED IN THE DESCRIPTION
Patent documents cited in the description