OCR Text |
Show percent) in SRC-I. Particulate emissions were high, ranging from 0.52 lb/hr, or 0.122 lb/MBtu, to 3.6 lb/hr, or 0.849 lb/MBtu, but results of the field comparator tests conducted by Wheelabrator-Frye, Inc., concurrently with the combustion tests indicate that fabric filters can be used to reduce emissions to within acceptable limits. ' COAL-WATER MIXTURES Interest in coal-water mixtures, as with coal-oil mixtures, has been sporadic in the United States until recently. Coal-water mixtures were used as fuels earlier in 1 R 1 9 20 99 Germany • and the Soviet Union • in pulverized-coal-designed boilers. Recently, 23 24 in this country, the Atlantic Research Corporation ' conducted tests with specially prepared CWM in a refractory test tunnel; Babcock and Wilcox has also burned two 25 differently prepared CWM's in its four million Btu/hr test furnace. The Department of Energy and The Electric Power Research Institute (EPRI) have embarked on a major program to develop CWM technology. The overall DOE CWM R&D plan provides for a part of the industrial and commercial "package" boiler application work to be done at the test facilities of PETC. A DOE solicitation will supplement and extend the work being done at PETC. The coal-water mixture combustion program at PETC was initiated in February 1981 in the 100-hp Alternative Fuel Combustion Test Facility. The near-term objective of the program has been to prepare CWM with coal concentrations that result in acceptable mixing and transport characteristics, and to achieve stable CWM flames in the oil-designed 100-hp firetube boiler. A comprehensive CWM test program will be conducted in the 700-hp watertube boiler. The midterm objectives are to establish CWM combustion characteristics in the oil-designed boilers as related to carbon burnout, boiler performance, pollutant emissions, ash deposition, and corrosion and erosion; to screen commercially available burners; and to determine the effects of different levels of beneficiated coals on CWM utilization. 14-14 |