W. R. Grace Co.-Conn.

William R Alcorn

William B Retallick

William Alan Whittenberger

Wesley P Bullock

Edward M Smith

A method of making a novel structure for the first stage of a multiple-stage combustion, in which a metal strip is coated with a catalyst on only one side. The strip is also corrugated with a herringbone pattern. The strip is then folded back and forth upon itself to form a reactor of a desired cross-section. The reactor has rows of channels that are formed between the layers of the metal. The single coated side of the metal defines the walls of the channels in every other row. The fuel-air mixture that flows through the coated channels is combusted. The fuel-air mixture that flows through the uncoated channels is not combusted, and cools the catalyzed surfaces. The herringbone corrugations prevent the layers of metal from nesting together, and also define zigzag paths for flow of combustion gas. The one or more stages subsequent to the ignition stage can employ a catalyst capable of operating at the very high temperatures present in gas turbines. The subsequent stages can also be non-catalytic. Thus, the first stage provides catalytic ignition, and the subsequent stages complete the combustion.

Method of making a combustion apparatus for high-temperature environment

This invention includes a multiple-stage combustion apparatus which can be used in a high-temperature environment, such as with a gas turbine. In particular, the invention includes a novel structure for the first stage of such apparatus, and a method of making that first stage. The first stage, which is an ignition stage, is a reactor formed of a metal strip which is coated with a catalyst on only one side. The strip is also corrugated with a herringbone pattern. The strip is then folded back and forth upon itself to form a reactor of a desired cross-section. The reactor has rows of channels that are formed between the layers of the metal. The single coated side of the metal defines the walls of the channels in every other row. The fuel-air mixture that flows through the coated channels is combusted. The fuel-air mixture that flows through the uncoated channels is not combusted, and cools the catalyzed surfaces. The herringbone corrugations prevent the layers of metal from nesting together, and also define zigzag paths for flow of combustion gas. The one or more stages subsequent to the ignition stage can employ a catalyst capable of operating at the very high temperatures present in gas turbines. The subsequent stages can also be non-catalytic. Thus, the first stage provides catalytic ignition, and the subsequent stages complete the combustion.

Combustion apparatus for high-temperature environment

A converter for treating gases to remove pollutants or particulate matter having layers of normally nesting corrugated thin metal foil, with or without a catalyst supported thereon, and characterized by spaced strands of wire or nonvitreous inorganic ceramic thread interposed between the layers to maintain them in spaced relation for the passage of gas, e.g., exhaust gas from an engine or plant, therethrough. The principal advantages are the relatively high particulate trap efficiency, the relatively low back pressure, and the low cost of manufacture.

Converter for removing pollutants from a gas stream

There is provided a process and apparatus for carrying out the process, to remove nitrogen oxides from a gas stream. The process is characterized by passing the gas stream through a first catalytic zone in the absence of added ammonia and in the presence of an oxidation catalyst to convert the NO content thereof to NO.sub.2, thereafter introducing ammonia into the gas stream, and catalytically reducing the NO.sub.2 to nitrogen and water in the presence of a catalyst. Higher conversion to innocuous materials is obtained.

Process for removal of NO.sub.x from fluid streams

A regenerable particulate trap for continuously separating particulates from, for example, the exhaust gas from a diesel engine, is characterized by a rotatable trap member mounted for rotation in the exhaust gas stream. Disposed over the face of the rotatable trap member on the upstream side is an enclosed, stationary chamber which isolates a portion of the rotatable trap member from the exhaust gas stream and directs a regenerating fluid through the rotating trap member, co-currently to the exhaust gas stream, to continuously remove the trapped particles by, e.g. burning in an oxygen-containing gas.

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Chagrin Falls, OH, United States of America

William R Alcorn