Honeycomb regenerator
First Claim
1. A honeycomb regenerator for recovering waste heat in an exhaust gas by passing an exhaust gas and a gas to be heated alternately therethrough, said honeycomb structural regenerator, comprising:
- first honeycomb structural bodies comprising aluminum-titanate as a main crystal phase or a combination of aluminum-titanate and mullite and being stable at a temperature of at least 1250°
C.; and
second honeycomb structural bodies, arranged adjacent said first honeycomb structural bodies in a direction parallel to a gas passing direction, comprising cordierite and/or mullite as a main crystal phase.
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Accused Products
Abstract
A honeycomb regenerator is constructed by (a) honeycomb structural bodies arranged in a high temperature portion, in which a temperature is over 1250° C. during a normal operation, made of aluminum-titanate or a combination of aluminum-titanate and mullite, and (b) honeycomb structural bodies arranged in a low temperature portion, made of cordierite and/or mullite, or by (a) honeycomb structural bodies arranged in a high temperature portion, to which an exhaust gas having a high temperature is contacted, made of aluminum-titanate or a combination of aluminum-titanate and mullite, (b) honeycomb structural bodies arranged in a middle temperature portion made of alumina and (c) honeycomb structural bodies arranged in a low temperature portion made of one material or a combination of materials selected from a group of cordierite, mullite and a porcelain. The honeycomb regenerator according to the invention can perform a heat exchanging operation effectively even in an exhaust gas having a high temperature and also in an exhaust gas having a high temperature and a corrosive property.
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Citations
9 Claims
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1. A honeycomb regenerator for recovering waste heat in an exhaust gas by passing an exhaust gas and a gas to be heated alternately therethrough, said honeycomb structural regenerator, comprising:
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first honeycomb structural bodies comprising aluminum-titanate as a main crystal phase or a combination of aluminum-titanate and mullite and being stable at a temperature of at least 1250°
C.; and
second honeycomb structural bodies, arranged adjacent said first honeycomb structural bodies in a direction parallel to a gas passing direction, comprising cordierite and/or mullite as a main crystal phase. - View Dependent Claims (2, 3)
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4. A honeycomb regenerator for recovering waste heat in an exhaust gas by passing an exhaust gas and a gas to be heated alternately therethrough, said honeycomb structural regenerator, comprising:
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first honeycomb structural bodies arranged in a first portion and comprising aluminum-titanate as a main crystal phase or a combination of aluminum-titanate and mullite;
second honeycomb structural bodies, arranged in a second portion adjacent said first honeycomb structural bodies in a direction parallel to a gas passing direction, comprising alumina as a main crystal phase and being stable at a temperature of at least 1250°
C.; and
third honeycomb structural bodies, arranged in a third portion adjacent said second honeycomb structural bodies in a direction parallel to a gas passing direction, comprising at least one material selected from the group consisting of cordierite, mullite and a porcelain having a corrosion resistivity. - View Dependent Claims (5, 6, 7, 8, 9)
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Specification