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piping systems
Variables effecting the combustion process

TM-5-3895-374-24-1 Paving Machine Bituminous Material: Crawler Mounted Diesel Engine Driven Manual
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TM 5-3895-374-24-1 DRYER DRUM GAS ANALYSIS FOR 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  the mixing is poor, an excess of air must be supplied so that every particle of fuel will contact some air and burn.  Unburned fuel 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  readings depends directly on the location from which the sample is drawn.  To give you an idea of the recommended placement, we have 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  the manufacturer of the equipment.  In most instances good readings require that the manufacturers instructions be adhered to rigidly. Conditions to perform a good analysis. 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  be approximately 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. Interpretation of gas readings. EXAMPLE Assuming a drum gas analysis is taken at production rates. Readings Taken:  02  - 4% CO - 2000 PPM Combustibles - 2% Problem: 3% 02 - is too low CO - is too high Combustibles are too high GJ73F- HAUCK MANUFACTURING CO., P 0 Box 90, Lebanon, PA 17042 717-272-3051 12/90 Fax 717-273-9882 Telex 671-1457 (page 3-528)







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