Engine exhaust gas heat exchanger and energy supplying device using the same

摘要

Regarding an engine exhaust gas heat exchanger that allows exhaust gas to collide with a coolant passage through apertures, a configuration that can improve efficiency of heat exchange is provided. The engine exhaust gas heat exchanger 1 is provided with multiple stages of unit exhaust gas passages 3a, 3b, 3c that are configured with a first exhaust gas passage A in which a plane facing an inlet is blocked and that has a plurality of apertures 30 in a circumferential direction and in a flow direction, and a second exhaust gas passage B that has a dividing wall facing the apertures 30 and also serving as the coolant passage 20 and an outlet that also serves as an inlet of the first exhaust gas passage A of a next stage or an outlet 26 of the engine exhaust gas heat exchanger 1.

主权项

1. An engine exhaust gas heat exchanger that is an exchanger of heat between engine exhaust gas and coolant and in which a plurality of apertures facing a coolant passage are provided in a circumferential direction and in an exhaust gas flow direction of an exhaust gas passage to allow the entire amount of exhaust gas to collide with the coolant passage,
the engine exhaust gas heat exchanger being provided with multiple stages of a unit exhaust gas passage that is configured with a first exhaust gas passage in which a plane facing an inlet is blocked and that has a plurality of apertures in a circumferential direction and in a flow direction, and a second exhaust gas passage that has a dividing wall facing the apertures and also serving as the coolant passage and an outlet that also serves as an inlet of the first exhaust gas passage of a next stage or an outlet of the engine exhaust gas heat exchanger, wherein, a total area of the apertures in each unit exhaust gas passage is decreased in all stages as it goes toward the lower stage by reducing the number of the apertures or respective diameters of the apertures, or the total area of the apertures in each unit exhaust gas passage is decreased in some stages as it goes toward the lower stage by reducing the number of the apertures or the respective diameters of the apertures.