[특허]Method and apparatus for the two-stage selective oxidation of carbon monoxide in a hydrogen-containing gas mixture

Method and apparatus for the two-stage selective oxidation of carbon monoxide in a hydrogen-containing gas mixture 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	C01B-031/20 B01J-008/00
출원번호	US-0293653 (1994-08-22)
발명자 / 주소	Buswell Richard F. (Glasjonbury CT) Cohen Ronald (Boca Raton FL) McNeilly Leonard (Burnaby CAX) Watkins David S. (Coquitlam CAX)
출원인 / 주소	Ballard Power Systems Inc. (North Vancouver CAX 03)
인용정보	피인용 횟수 : 54 인용 특허 : 0

초록 ▼

An apparatus and method are provided for the two-stage selective oxidation of carbon monoxide to carbon dioxide in a fuel stream comprising hydrogen and carbon monoxide. The apparatus includes primary and secondary reaction chambers, which deliver a hydrogen-rich outlet gas stream having a carbon monoxide concentration of less than about 5 ppm. When an increase in the carbon monoxide concentration in the outlet stream of the primary reaction chamber is detected, then the flow through the primary reaction chamber is reversed. The selective oxidizer employs a temperature-based control strategy as an oxygen-containing gas stream flow rate adjustment around the flow rate initially set in direct proportion to the fuel gas stream flow rate. The control strategy regulates the amount of oxygen-containing gas mixed with the gaseous fuel stream as a function of the difference between the temperature at a location at or near the end of the primary reaction chamber and the temperature at the outlet of the primary reaction chamber.

대표청구항 ▼

A method for controlling the rate of selective oxidation of carbon monoxide to carbon dioxide in a fuel stream comprising hydrogen and carbon monoxide introduced to a reaction chamber having disposed therein an amount of catalyst for promoting oxidation of carbon monoxide to carbon dioxide, said reaction chamber further comprising a fuel stream inlet, an oxygen-containing gas stream inlet having a valve for regulating flow therethrough, an outlet, a first thermocouple which is located in the reactor chamber downstream from said fuel stream inlet a distance that is about 60-90% of the length from the said fuel stream inlet to said reactor outlet for measuring the temperature of said reaction chamber near said outlet, and a second thermocouple for measuring the temperature within said outlet, said method comprising: (a) measuring the flow rate of said fuel gas stream introduced to said reaction chamber at said fuel stream inlet; (b) actuating said oxygen-containing gas stream inlet valve such that an amount of oxygen-containing gas is introduced to said reaction chamber at a flow rate in direct proportion to the flow rate of said fuel gas stream as measured in step (a); (c) actuating said oxygen-containing gas stream inlet valve to increase the flow rate of said oxygen-containing gas stream into said reaction chamber from the flow rate established in step (b) when the difference between the temperature measured by said first thermocouple and the temperature measure by said second thermocouple is greater than a pre-set control temperature difference; and (d) actuating said oxygen-containing gas stream inlet valve to decrease the flow rate of said oxygen-containing gas stream into said reaction chamber from the flow rate established in step (b) when the difference between the temperature measured by said first thermocouple and the temperature measure by said second thermocouple is less than said pre-set control temperature difference.

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Method and apparatus for the two-stage selective oxidation of carbon monoxide in a hydrogen-containing gas mixture 원문보기

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