| OCR Text |
Show happened to have a similar range to the NOX values, of 200 to 600 ppm, but with slurry #3 generating the higher values (300 to 600 ppm compared with 200 to 300 for //2) . For slurry //2 this represented about 40% of the fired sulfur; for slurry //3 the balance values were much more erratic with a range from 80% to 160% (!) but suggesting by this that the sulfur from this slurry was possibly being converted quantitatively to SO-. If that is a correct conclusion, and the conversion values for slurry ill are relatively correct, it does imply loss of S, presumably by conversion to sulfate. On a thermal basis these values are in the range of 0.5 to 0.6 lb/million Btu, which is a respectable value. (iii) Particulates: measurements were required for determining combustion efficiency from the carbon in the ash, and to determine the increase if any in sulfate in the ash. However, the solid sampling probe never collected sufficient sample for any type of analysis in several hours of sampling in several runs. Some of the ash was deposited in the main furnace chamber, mostly as a light dusting except in corners; it was removed between most runs with a vacuum cleaner. Such samples are useless to determine combustion efficiency by degree of burn-out for obvious reasons. They have not been used so far for sulfate determinations for somewhat similar concerns of time changes after deposition; they also tend to be contaminated to some extent by friable refractory. This is clearly a problem that require.1, much more carefu] attention, however. If the NOX and SOX data are reasonably reliable they do indicate that the emissions could be in compliance or tractable. This conclusion is tenuous at this time being based on a very limited number of measurements; nevertheless, they are certainly encouraging. |
