Exhaust gas purification device for internal combustion engine

Abstract

An inlet chamber 40 and outlet chamber 50 for exhaust gas are integrated as an inflow / outflow section 80, and a first post treatment device 10 equipped with a DPF 13 at its central portion and second post-treatment device 20 equipped with a urea DeNOx catalyst 23 on its outer periphery side are integrated as a catalyst installation section 70. The catalyst installation section 70, the inflow / outflow section 80, and a communication chamber forming section 30 are provided separately and detachably from one another, and the catalyst installation section 70 is made installable in a reversible manner. As a result, by reversing the catalyst installation section 70, it is possible to easily reverse the DPF 13 without having to extract it from the central part. Further, since the urea DeNOx catalyst 23 is reversed simultaneously, it is possible to change the direction in which the exhaust gas flows therein, thereby enabling to prevent unbalanced deterioration of the urea DeNOx catalyst 23.

Description

technical field [0001] The present invention relates to an exhaust gas purification device of an internal combustion engine, and in detail, relates to an exhaust gas purification device of an internal combustion engine for purifying exhaust gas provided in an exhaust flow path of the internal combustion engine. Background technique [0002] Conventionally, it is known to install an exhaust gas purification device in an exhaust flow path of an internal combustion engine in order to trap particulates (particulate matter) in exhaust gas discharged from an internal combustion engine such as a diesel engine or to reduce the amount of NOx. [0003] As an exhaust gas purification device for trapping particulates, a device equipped with a diesel particulate filter (hereinafter referred to as DPF (Diesel Particulate Filter)) was developed, and as an exhaust gas purification device for reducing the amount of NOx, a device equipped with a NOx reduction Catalysts, NOx absorption and red...

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Problems solved by technology

[0009] However, in the exhaust gas purifying device described in Patent Document 1, since the DeNOx catalyst is arranged around the DPF and the entire body is covered with a can, in order to reverse the DPF, it is necessary to pull out the DEF surrounded by the DeNOx catalyst after opening the can. , then reverse and insert again, thus taking time, very cumbersome

[0010] In addition, since the DeNOx catalyst is always fixed in the same direction, the closer to the inflow side of the exhaust gas, the easier it is to deteriorate, and the performance of the catalyst varies between the inflow side and the outflow side, resulting in a problem that the utilization efficiency of the DeNOx catalyst is poor.

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