OCR Text |
Show -5- The different axial positions in between catalyst blocks represent different space velocities. The sample was transported via a 3/8" Teflon heated sample line to an ammonia scrubber, an impinger filled with 0.02 N sulfuric acid solution. It was necessary to scrub the ammonia out of the gas stream prior to entering the NOx analyzer, since any ammonia that is present is converted in the chemiluminescent analyzers stainless steel NOx to NO converter resulting in a false reading of the NOx concentration. After ammonia scrubbing, the gas stream was transported to the continuous emission monitoring instrumentation via a second 3/8" Teflon heated sample line. Before passing through the analyzers, the sample is dried in a refrigerated dryer. The dried sample was analyzed for NO, NOx' N02, O2, CO, and CO2 using the continuous gas analyzers listed in Table 2. Table 2 Continuous Gas Analysis Instrumentation Species Analyzer Analyzer Method Range Span NO/NOx TEC010 Chemiluminescent 1-100 ppm 74 ppm 0-250 ppm 152 ppm O2 Teledyne 326 Electrochemical 0-10% 9.05% CO Horiba PIR 2000 Nondispersive 0-1000 ppm 400 ppm Infrared (injection location) CO2 Horiba PIR 2000 Nondispersive 20% 200/0 Infrared N20 Horiba VIA 500 Nondispersive 0-100 ppm 74 ppm Infrared NH3 Siemens SF Infrared Absorption 0-200 ppm 150 ppm 0-1000 ppm -- In addition to the continuous ammonia monitor shown in Figure 1 and listed in Table 2, ammonia concentrations were determined using a wet chemical technique. A two to three cubic foot sample was extracted at a rate of approximately 0.2 cfm. The NH3 was scrubbed from the sample by a pair of 100 ml impingers containing 0.02 N H2S04• After |