Internal-combustion engine exhaust gas purification system, and internal-combustion engine exhaust gas purification method

Abstract

An internal-combustion engine exhaust gas purification system 1 in which a fine particle collecting unit with a catalyst 21 is disposed in an exhaust gas passage 15 of an internal-combustion engine 10, wherein the configuration of a filter in the fine particle collecting unit with a catalyst 21 comprises a partial filter 21a, without an exhaust gas purification unit supporting an oxidation catalyst being disposed in the exhaust gas passage 15 upstream of the fine particle collecting unit with a catalyst 21, and a catalyst 21b supported by the partial filter 21a is a precious-metal-free catalyst that does not include a precious metal.

Description

technical field [0001] This patent relates to an internal combustion engine exhaust gas purification system and an internal combustion engine exhaust gas purification method. More specifically, an internal combustion engine exhaust gas purification system and an internal combustion engine exhaust gas purification method are disclosed, in which pressure loss in an exhaust gas purification unit for purifying PM (particulate matter) is reduced, thereby making regeneration of PM zero or regenerating PM The frequency of PM is significantly reduced, even if the fuel used has a high content of sulfur, the incidence of sulfur poisoning caused by noble metal catalysts will be reduced, and thus the amount of fuel consumed to purify PM will also be reduced. Background technique [0002] Generally speaking, in a vehicle equipped with an internal combustion engine such as a diesel engine, such as image 3 As shown, a PM purifying device 30 is used to remove PM (particulate matter) in exh...

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Problems solved by technology

[0010] Then, since the exhaust gas purification filter uses the second exhaust gas purification catalyst containing precious metals, in areas where high-sulfur fuel is used, the sulfur components removed from the exhaust gas cause sulfur poisoning, the oxidation function is weakened, and the PM purification function is also reduced. will be weakened

Moreover, in the desulfurization treatment to solve sulfur poisoning, a high-temperature rich combustion environment is required, so that the fuel consumed for sulfur poisoning regeneration increases, so the efficiency of fuel utilization also decreases.

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