| OCR Text |
Show components, and temperatures, and pressures at various combustor locations. Special diagnostics included gas sampling from several locations and analysis, flame monitoring through pin hole camera-video arrangement, combustion gas temperature measurement by an enthalpy probe and slag recovery determination. Fuel Analysis Four tons of CWM (ARCOAL) were procured from ARC for the combustion test. The CWM was delivered at FETS in seventeen 55 gallon barrels. The coal used in the preparation of the CWM contained 7.16% ash by weight. According to the manufacturers specifications, the CWM contained 69.71% of coal, 1% of additives and the remaining 29.29% water. At least two samples of slurry were taken from each barrel after blending (during the test) and were analyzed for moisture and ash content. Combustion Tests Pulverized coal was used to ignite the CWM in combustion tests. The pulverized coal pintle was introduced below the CWM burner and positioned in such a way that the coal flame directly contacted the atomized CWM. A pinhole camera was positioned at the back end of the combustor so the flame could be continuously monitored. After a few minutes of combustion with pulverized coal, CWM was gradually injected into the combustor. As CWM combustion was established, the pulverized coal feed was shut-off. Approximately 7000 lbs of CWM were burned during the seven runs extending over a total time of 9 hours. Durin the first run, the operating conditions were varied over a wide range to ensure flame sustanance. A stable flame was sustained over the entire range without any difficulty. The effect of the following parameters were investigated. • Stoichiometry, <f> 0.7-1.15 • Preheat, T 700°F - 1900°F o m . • AFR, - r ^ 0 - 0.4 01 CWM • Oxidizer velocity, V 300 - 600 ft/sec o • Loading (or power input) 5 - 15 MM Btu/hr 9 |
