Converter for exhaust gases of internal combustion engines
A technology for converters and internal combustion engines, which is applied to machines/engines, exhaust devices, mechanical equipment, etc., and can solve the problems of not very wide catalytic surface, inability to utilize catalysts to the best degree, and limited conversion efficiency.
Inactive Publication Date: 2008-10-01
SAES GETTERS SPA
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Problems solved by technology
There are basically two problems with this device: firstly, the entire surface available for contact with the gas corresponding to the expansion of the helical structure is not particularly wide, and the ratio between the volume of the device and the geometric surface on which the catalyst is laid is not Favorable; secondly, the strictly linear geometry of the grooves is such that the gas flow through the structure is generally laminar, thereby not utilizing the catalyst to the optimum extent
In this case, however, the available catalytic surface is not very wide and thus the conversion efficiency is limited
Method used
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[0014] figure 1 Shown is an exploded view of a converter 10 according to the invention comprising a conversion system 11 comprising a plurality of panels 12; the converter 10 comprising a housing 13 in a known manner having at least one inlet 14 for the exhaust gas from the internal combustion engine to be treated, and at least one outlet 15 for the exhaust gas treated by the system 11 . These panels are preferably surrounded by metal elements 16 (not shown in this figure) which form a frame which is fixed on the edges of the panels by any suitable means, for example by mechanical crimping: this frame helps to keep the panels 12 Flatness is maintained during cycles (both heat treatment to oxidize and functionalize the panels, and thermal cycling due to operations downstream of the internal combustion engine) and fiber loss at the panel edges is avoided. Converter 10 may include a flange (not shown in this figure) around the periphery of outlet 15 .
[0015] According to the ...
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It is described a converter for exhaust gases of internal combustion engines, comprising a housing which is provided with at least one inlet opening for the exhaust gases to be converted and with at least one outlet opening for the converted gases and includes a converting system, in which the converting system comprises a plurality of panels of fibers comprising a metallic center covered with a layer of oxides carrying catalytically active metals, said panels being arranged with an edge facing the inlet opening and with another edge facing the outlet opening, essentially parallel to each other, and kept spaced apart by means of metallic spacers.
Description
technical field [0001] This invention relates to a converter for internal combustion engines, and more particularly to a device which can be used to oxidize the exhaust gases of these internal combustion engines. Background technique [0002] Exhaust gases from internal combustion engines are known to contain incompletely oxidized gases such as CO and unburned hydrocarbons; these gases are a source of environmental pollution and current regulations require systems to eliminate these emissions, e.g. combustion of the gas. [0003] US Patent 5294411 discloses a device for treating exhaust gases comprising a helically rolled honeycomb structure having a catalytically active continuous surface on a ceramic or metal substrate, in which surface, The exhaust gas flow follows a linear path, flowing in a plurality of grooves defined by the structure itself, all parallel to each other and to the direction of said exhaust gas flow. There are basically two problems with this device: f...
Claims
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IPC IPC(8): F01N3/28
Inventor P·德拉波塔G·萨尔瓦戈S·齐里奥G·韦尔加尼
Owner SAES GETTERS SPA