Advanced combustion system for industrial boilers. Phase 2, Quarterly technical progress report, January--March 1990
During Phase I of the project, a coal injector was designed, fabricated, and tested. It is a direct replacement for the oil gun in the original equipment of a 200 hp CleaverBmoks fire-tube boiler. The system was tested at coal-firing rates in the range of 2 to 6 million Btu`s per hour, firing Upper Elkhorn No. 3 (eastern bituminous, ``UE3``) coal supplied by Energy International, Incorporated. For these tests, propane was used to preheat the boiler before initiation of coal firing. The propane flow was turned off after coal combustion was established. No combustion air preheat was used. During these tests, boiler efficiency was typically about 85 to 86 percent, while carbon conversion efficiency was approximately 94 percent. Concentrations of CO were less than 150 ppm. The NO{sub x} emissions were less than 0.6 pounds per million Btu`s. Following a series of laser-illuminated cold-flow-visualization tests, a new burner was also designed, fabricated, and tested during Phase 1. The arrangement is shown in Figure 1.2. It is a two-stage, swirl burner which fits in the space previously occupied by the original Cleaver-Brooks burner, and uses the existing section of refractory. Air flow can be regulated independently into each of the two stages. Additionally, the angle is adjustable for individual swirl blades. Upper Elkhorn No. 3 ultra fine coal was used as the standard fuel for most UTSI-burner tests. Firing rates were in the range of 2 to 6 million Btu`s per hour. Upper Elkhorn No. 3 coals were tested with three levels of ash. These were approximately 1.4%, 2.7%, and 4.8% ash, on an as-fired basis. The 2.7%-ash UE3 coal was used for most tests because it exhibited a good balance between ash content and ash-fusion characteristics.
- Research Organization:
- Tennessee Univ., Tullahoma, TN (United States). Space Inst.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC22-87PC79653
- OSTI ID:
- 10121441
- Report Number(s):
- DOE/PC/79653-T10; ON: DE94006413; BR: AA3520100
- Resource Relation:
- Other Information: PBD: [1990]
- Country of Publication:
- United States
- Language:
- English
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