OCR Text |
Show elements are used to maintain pump reliability and ensure material compatability. A special liquid/evaporation feed system was required for this study since the burner can only combust gaseous feedstocks and CH CI exists as a liquid at standard conditions. A pumpless feed system utilizing high pressure N9 was developed to meter and vaporize liquid hazardous feedstocks before introduction to the burner [6]. All fluid streams are metered using conventional rotameters obtained from Matheson. Both temperature and gas sampling probes are stationary (in specific blind flanges fixed to the Pyrex cross) while the burner is translated to provide various profiles. The Pyrex cross is sealed for safety and also for operation at subatmospheric pressures. Ignition is achieved via a coil of Nicrome wire fixed to a ceramic insulator and subsequently fed through a blind flange. All temperature measurements are obtained using uncoated 0.05 mm Pt-10% Rh vs Pt thermocouple wire formed into a standard rake configuration. Typical thermocouple bead diameters approach 0.10 mm. Temperatures are determined using conventional radiation correction techniques. Gas samples are drawn from the flame zone using a 6.0 mm OD, aerody-namically quenched, quartz, micro gas sampling probe. A pressure ratio of 15:1 across the average 80 micron tip orifice is maintained to ensure quenching. The sampling probe is coupled to 100 cc purge through, glass sample bottles located immediately above the cross. Connections to these bottles are of pyrex glass and Teflon. Details of these probes, their exact location, and specific construction techniques are provided in references 6, 9, and 10. 5.3.5 |