Evidence of the rich flammability limit for pulverized pittsburgh seam coal-air mixtures

✍ Scribed by Scott E. Slezak; Richard O. Buckius; Herman Krier

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 443 KB
• Volume: 63
• Category: Article
• ISSN: 0010-2180
• DOI: 10.1016/0010-2180(86)90121-5

✦ Synopsis

Evidence for a rich flammability limit is presented for pulverized Pittsburgh seam coal (36% volatiles, 56.1% fixed carbon, 50 #m mass mean particle diameter). Experiments were conducted in a large (0.3 m diam by 4.5 m long) horizontal tube that generated a vertical dust concentration gradient for the rich mixtures. Horizontally propagating steady state flames were observed only in regions where the concentration was below 1.5 kg/m 3. When the location where the dust concentration exceeded 1.5 kg/m 3 was varied, the edge of the visible flame front moved accordingly. This is interpreted as evidence for a rich limit of 1.5 kg/m 3 for this coal.