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Distributing Hydrogen and Other Hazardous Gases Uniformly in Dual Exhaust Systems

IP.com Disclosure Number: IPCOM000084583D
Original Publication Date: 1975-Dec-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Chappelow, RE: AUTHOR [+3]

Abstract

Described is a method for distributing hazardous gases uniformly in dual-exhaust systems.

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Distributing Hydrogen and Other Hazardous Gases Uniformly in Dual Exhaust Systems

Described is a method for distributing hazardous gases uniformly in dual- exhaust systems.

Safety requirements impose upper limits on the concentration of hazardous materials in the facility exhaust flow. In the figure, a reacting gas stream 10 is shown as flowing in a reactor 11 across heated substrates 12, which results in desired deposits being formed on the substrates. Frequently, a major component of the stream is hydrogen gas. This hydrogen effluent must be exhausted from the reaction chamber 11. Because, however, the hydrogen concentration in the exhaust flow should be less than one percent for safety reasons, exhaust flow rates on the order of 1500 cubic feet per minute must be provided when the hydrogen flow through the reaction chamber 11 is on the order of 15 cubic feet per minute. Such exhaust rates can be achieved only with ductings of a diameter of approximately 15 inches.

However, such ducting sizes are usually outside of the allowable diameters permitted by modern processing lines.

To circumvent these difficulties, it is convenient to provide several smaller ducts 13 and 14 and to distribute the reaction effluent uniformly among them. However, the physical properties of hydrogen are such that the distribution of hydrogen among the several ducts is difficult. For, in response to minor imbalances in flow among the several ducts, the hydrogen will preferentially flow into one but not into the others. This problem...