KR860007953A - Monolithic catalytic converter installation device - Google Patents

Abstract

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Description

Monolithic catalytic converter installation device

Since this is an open matter, no full text was included.

1 is a fragmentary equivalent diagram of an apparatus implementing the present invention.

Explanation of symbols on the main parts of the drawings

10 catalyst converter 12 housing

14 entrance 18 ceramic unitary body

20: ceramic fiber layer 22, 23: expandable layer.

Claims (20)

In an apparatus for treating exhaust gas from an internal combustion engine A housing having an inlet at one end and an outlet at the other end, through which exhaust gas flows. A brittle ceramic unit having an outer surface, the inlet end surface of one end communicating with the inlet of the housing and the outlet end surface of the opposite end thereof communicating with the outlet of the housing. A ceramic fiber layer covering and in contact with at least a portion of said outer surface of said monolith; and an expandable layer disposed between said housing and said ceramic fiber layer. The method of claim 1, And the ceramic fiber layer is selected from the group consisting of ceramic fiber mats, ceramic fiber blankets, ceramic fiber felts or ceramic fiber paper. The method of claim 1, And said ceramic fiber layer contains less than 30 percent by weight of vermiculite. The method of claim 1, The ceramic fiber layer is a monolithic catalytic converter installation device characterized in that the ceramic fiber paper without vermiculite. The method of claim 3, Single-piece catalytic converter installation device, characterized in that the ceramic fiber paper is thick enough to limit the maximum temperature of the expandable layer to about 1038 ° C. (1900 ° F.) or less when the monolith is at the planned maximum continuous operating temperature. The method of claim 1, Wherein the ceramic fiber layer is of sufficient thickness to limit the maximum temperature of the contact area between the expandable layer and the ceramic fiber layer to 1010 ° C. (1850 ° F.) or less when the monolith is at the intended maximum continuous operating temperature. . The method of claim 3, And wherein the ceramic fiber paper has an installation nominal thickness of at least 0.889 mm (0.035 inch) and an installation nominal density of at least 0.64 g / cm ³ . The method of claim 4, wherein And wherein the expandable layer contains ion-exchange vermiculite and the ceramic fiber layer limits the exhaust gas up to 1010 ° C. (1850 ° F.) at most during the continuous treatment. The method of claim 8, A monolithic catalytic converter installation apparatus, characterized in that the planned operating temperature of the monolith is greater than 1038 ° C. (1900 ° F.). The method of claim 8, A monolithic catalytic converter installation apparatus, characterized in that the planned operating temperature of the monolith is 1066 ° C (1950 ° F). In the catalytic converter for purifying the exhaust gas of the internal combustion engine, Hollow metallic housing having an inner surface and an inlet at one end and an outlet at the other end: A brittle breathable ceramic unitary catalyst element resiliently installed in said housing having an inlet end surface in communication with said inlet of said housing and an outlet end surface in communication with said outlet end of said housing; Means for thermally insulating and elastically installing said catalytic element in a spaced relation from said housing, comprising: A ceramic fiber layer capable of resisting continuous exposure to a temperature of at least 1093 ° C. (2000 ° F.) covering and contacting at least 70 percent of the outer surfaces of the catalytic elements between its end surfaces: and covering the ceramic fiber layer and And at least one layer of expandable sheet material in contact with the housing. The method of claim 11, Wherein said layer of ceramic fibers is selected from the group consisting of ceramic fiber mats, ceramic fiber blankets, ceramic fiber felts or ceramic fiber paper. The method of claim 11, Said inner layer of ceramic fiber has an uncompressed nominal thickness of at least 1.5875 mm (1/16 inch) and an uncompressed nominal density of at least 0.19 g / cm ³ . The method of claim 11, The catalytic converter layer is characterized in that the ceramic fiber layer has an installation nominal thickness of at least 0.762 mm (0.030 inch) and an installation nominal density of at least 0.64 g / cm ³ . The method of claim 14, The catalytic monolith element is at least 5.08 mm (0.2 inch) spaced from the housing. The method of claim 14, The expandable site material has an uncompressed nominal density of about 0.64 g / cm ³ and an installation ceramic fiber layer of about 0.4 inch, and an expandable sheet material layer of about 6.35 mm (1/4 inch) combined thickness and Catalytic converter characterized by having a combined density of about 1.12 g / cm3. The method of claim 13, Said expandable site material having an uncompressed nominal density of about 6.64 g / cm ³ . The method of claim 17, A catalytic converter comprising two layers of expandable sheet material, each having an uncompressed nominal thickness of about 5.08 mm (0.2 inches). The method of claim 11, The monolithic element is wrapped in a layer of ceramic fiber paper having about 93 weight percent ceramic fibers having a fiber-to-short ratio of about 70/30, the ceramic fibers being alumino-silicate glassy having an alumina content of about 50 weight percent Fiber, the ceramic fiber paper having an installation thickness of about 0.889 mm (0.035 inch) and an installation density of about 0.69 g / cm ³ , wherein the expandable layer is aqueous to actually complete ion exchange with NH ₄ ⁺ cation Comprising two layers of material having from about 40 to about 65 weight percent of unexpanded vermiculite flakes treated from ammonium solution, from about 25 to about 50 weight percent of inorganic fiber material and from about 5 to about 15 percent binder And the expandable layer exposed to heat above 350 ° C. undergoes thermal expansion. A method of installing a breathable ceramic monolithic catalytic element having an inlet and an outlet end surface in a housing, the method comprising: A layer of ceramic fiber paper wraps around the monolith between the inlet and outlet end surfaces, A unitary body enclosed by the ceramic fiber paper layer to form an assembly, wherein the breathable ceramic unity forms a housing around the assembly in which the expandable sheet material is radially compressed between the unitary body and the housing. Method of installation of catalytic elements. ※ Note: The disclosure is based on the initial application.