OCR Text |
Show container-oxygen samples be taken for the duration of the test which would provide both an integrated average oxygen sample as well as an instantaneous oxygen readout. The first test at twenty-eight thousand pounds per hour steam flow rate was run for two hours from 12 noon to 2 p.m. Data were collected during this time firing Number 6 fuel oil. The furnace was adjusted for stack appearance and at this reduced boiler load rate, the oxygen analyzer read 6.4 to 9 percent oxygen inside the furnace. At the completion of this test, an integrated reading on the furnace of the complete run averaged 10.1 percent. Their integrated sample taken from the stack for the duration of this run yielded an oxygen reading of 12.3 percent. The results show, as had been previously proposed, that percent oxygen recorded as the stack would be slightly higher due to air infiltration between the furnace and the stack. At 2 p.m., the half-load test was concluded and then, for a period of thirty minutes, the boiler was loaded to fifty-six thousand pounds per hour to settle out at this flow rate. Data were once again recorded for a two-hour duration and the combustion was adjusted for stack appearance, although the best looking stack obtained was a dark-grey, smokey stack when firing oil at this flow rate. Data were recorded for this test and the instantaneous analyzer reading taken from the furnace was set at 7-9 percent oxygen. The integrated bag sample from the stack for this run was recorded at 7.3 percent oxygen. During the day, it was calculated that the biomass pellets would be fired on the boiler for approximately six hours. Therefore, twenty-five thousand seven hundred fifty pounds of biomass pellets were loaded into the coal silo for the following day's testing. 26-17 |