OCR Text |
Show SOLVENT-REFINED COAL Combustion tests with SRC-I were first carried out in a test tunnel furnace at q Babcock & Wilcox in 1964. In 1976, independent SRC-I tests were conducted in solid fuel combustors at PETC* Combustion Engineering, and Babcock & Wilcox. In 1977, a full-scale utility boiler test was conducted at the Mitchell Plant site of Georgia 12 Power Company. Evaluations of these test results have been summarized in a data book.13 Although SRC-I was burned successfully in a coal-designed utility boiler (Plant Mitchell), the feasibility of using this fuel in more compact oil- or gas-designed units significantly higher heat liberation rates remained uncertain. In 1980, in cooperation with the International Coal Refining Company (ICRC, prime contractor for development of the SRC-I process), a series of SRC-I combustion tests was conducted at PETC using a 100-hp firetube boiler (Figure 2) designed to burn No. 6 fuel oil. Concurrently with the combustion tests, a particulate control device was tested by Wheelabrator-Frye, Inc. SRC-I was fed to the boiler in three different physical forms: 1. A slurry composed of 70 percent by weight SRC-I process solvent and 30 percent by weight solid SRC pulverized to 92 percent minus 200 mesh. The slurry was atomized with air at ambient temperature. 2. A molten liquid at approximately 600°F, using superheated steam at 800°F for atomization, and preheated combustion air at 400 F. 3. A solid, pulverized to 90 percent minus 325 mesh, using preheated secondary air at 550°F. Since the new boiler and its operating parameters had not been fully optimized at the beginning of this program, and the entire series of tests including facility completion and modifications for each form of firing were scheduled within a limited time period of 4j months, the combustion tests were not anticipated to represent a 14-10 |