| OCR Text |
Show 6. CONCLUSIONS PETCOM, using ultrafine grinding and good atomization techniques, burns similarly to No. 6 or Bunker "C" fuel oils. However, small-scale combustion tests and analytical investigations show that the slurry fuel combustion process is unique. Using typical storage, fuel handling and burner equipment, PETCOM fuels can be used successfully and economically in a variety of boiler applications. Although Cities initial tests with steam atomization provided lower combustion efficiencies and carbon burnout, these results were due to non- optimum nozzle configuration and atomization steam conditions (pressure, temperature and flow-rate). Additional fuel preheat which leads to lower fuel viscosity at the atomizer tip, is the most efficient means of improving atomization. Steam in the particle combustion environment can lead to slightly lower PETCOM flame and particle temperatures. However, at high particle temperatures, endothermic reactions of coke and steam can take place which enhance the rate of coke particle loss. Other gaseous constituents in the particle combustion environment reduce the rate of coke loss due to reduction of oxygen partial pressure. Some chemical reaction of CO, C02, NO and S02 is expected to occur on the coke particle surface, but not at rates as high as oxygen. In conclusion, small-scale test results and analysis indicate a strong potential for PETCOM to be a commercially viable fuel as a replacement of of No. 6 or Bunker "C" fuel oils. Future small-scale and large-scale combustion tests of PETCOM will add to the knowledge of the properties and combustion behavior of these fuels. 19-32 |
