초록 ▼

A gas sampling apparatus includes a probe tube having a tip positionable in a stream of products of combustion and a sample dryer tube connected in fluid communication with an end of the probe tube opposite the tip. The sample dryer tube is received in a purge gas tube along a lengthwise axis thereo

A gas sampling apparatus includes a probe tube having a tip positionable in a stream of products of combustion and a sample dryer tube connected in fluid communication with an end of the probe tube opposite the tip. The sample dryer tube is received in a purge gas tube along a lengthwise axis thereof. The purge gas tube and the sample dryer tube define therebetween a space through which a purge gas pump urges a purge gas in a first direction. A sample pump connected in fluid communication with the sample dryer tube urges therethrough in a second direction opposite the first direction a sample of gas obtained from the stream of products of combustion via the probe tube. A sensor is positioned to detect a constituent of the sample of gas exhausted from the sample dryer tube. The sample dryer tube is formed at least in part of a hydrophilic membrane and the purge gas entering the space contains less water vapor than the sample of gas. Water vapor contained in the sample of gas is conveyed through the hydrophilic membrane part of the sample dryer tube to the purge gas flowing in the space so that the purge gas exhausted from the space contains more water vapor than the purge gas entering the space and the sample of gas exhausted from the sample dryer tube contains less water vapor than the sample of gas entering the sample dryer tube.

대표청구항 ▼

[ We claim:] [1.] A method of sampling gas obtained from a stream of products of combustion, the method comprising the steps of:(a) obtaining a sample of gas from a stream of products of combustion;(b) urging the sample of gas through a sample dryer tube disposed inside a purge gas tube;(c) urging a

[ We claim:] [1.] A method of sampling gas obtained from a stream of products of combustion, the method comprising the steps of:(a) obtaining a sample of gas from a stream of products of combustion;(b) urging the sample of gas through a sample dryer tube disposed inside a purge gas tube;(c) urging a purge gas through a space formed between the purge gas tube and the sample dryer tube in a direction opposite the sample of gas in the sample dryer tube;(d) maintaining the sample dryer tube adjacent an end thereof which receives the sample of gas therein one of at and above a temperature above the dew point temperature of water in the sample of gas; and(e) sensing a constituent in the sample of gas exhausted from the sample dryer tube, wherein:the purge gas entering the space contains less water vapor than the sample of gas entering the sample dryer tube; andthe sample dryer tube is formed at least in part from a hydrophilic membrane which enables water vapor to be conveyed from the sample of gas to the purge gas whereby the purge gas exhausted from the sample dryer tube contains more water vapor than the purge gas entering the space, and the sample of gas exhausted from the space contains less water vapor than the sample of gas entering the sample dryer tube.