TM 5-3895-374-24-1DRYER DRUM GAS ANALYSISFOR NATURAL GAS, OIL AND LP _Gas analyses are used to indicate the air-fuel ratio and to indicate the degree of completeness of combustion. If themixing is poor, an excess of air must be supplied so that every particle of fuel will contact some air and burn. Unburnedfuel is simply wasted since it does not contribute heat to the process.A critical step in every dryer drum gas analysis is the placement of the sample tube. The applicability of the readingsdepends directly on the location from which the sample is drawn. To give you an idea of the recommended placement, wehave included a drawing in this section. Refer to “Typical Sample Tube Installation for Dryer Drum Gas Analysis”.The procedures used to make an accurate gas analysis vary not only with the method employed but also with themanufacturer of the equipment. In most instances good readings require that the manufacturers instructions be adheredto rigidly.Conditionstoperformagoodanalysis.1.Use a reliable gas analyzer.2.Sample pipe must be installed in the dryer drum to eliminate reading stray 02, overheated RAP or overheated AC.3.Sample should be taken with average tonnage, moisture and firing rates.4.Allow at least 10 to 15 minutes running time at production rates before taking readings.5.Sample tubing from the sample pipe to the analyzer should be as short as possible. Tubing should beapproximately ¼ inch I.D. rubber, plastic or silicone.6.Gases should be sampled until instrument settles out, normally a few minutes depending on sample line size,length, and pump volume.Interpretationofgasreadings.EXAMPLEAssuming a drum gas analysis is taken at production rates.Readings Taken: 02 - 4%CO - 2000 PPMCombustibles - 2%Problem: 3% 02 - is too lowCO - is too highCombustibles are too high GJ73F-HAUCK MANUFACTURING CO., P 0 Box 90, Lebanon, PA 17042 717-272-305112/90Fax 717-273-9882 Telex 671-1457(page 3-528)
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