Characteristics of chars produced from lignites by pyrolysis at 808 °C following rapid heating
✍ Scribed by Nsakala Ya Nsakala; Robert H. Essenhigh; Philip L. Walker Jr
- Publisher
- Elsevier Science
- Year
- 1978
- Tongue
- English
- Weight
- 876 KB
- Volume
- 57
- Category
- Article
- ISSN
- 0016-2361
No coin nor oath required. For personal study only.
✦ Synopsis
Closely size graded lignite particles were pyrolysed at 808°C in a laminar flow furnace for times up to 1 s following heating up at 8 x 103'C/s.
Following pyrolysis, the chars were rapidly cooled -at about 3 x 104"C/s.
Weight losses were measured as a function of pyrolysis time. The following measurements were made on the chars: (1) nitrogen and carbon dioxide specific surface areas, using adsorption data at 77 and 298 K, respectively;
(2) apparent and true densities obtained from mercury and helium displacements;
(3) total open-pore volumes and porosities; and (4) particle size distributions. Results show, with increasing pyrolysis time, that: (i) specific surface areas increase, (ii) helium densities increase, (iii) mercury densities decrease, (iv) open-pore volumes increase, and (v) weight-mean particle size decreases. Chars produced following rapid heating have higher open-pore volumes than those produced following slow heating.