- Author
- Clay, D. T. | Lien, S. J. | Grace, T. M. | Brown, C. A. | Macek, A. | Semerjian, H. G. | Amin, N. | Charagundla, S. R.
- Title
- Fundamental Studies of Black Liquor Coambustion. Report No. 3. Phases 1, 2, and 3. December 1986-December 1987.
- Coporate
- Institute of Paper Chemistry, Appleton, WI National Institute of Standards and Technology, Gaithersburg, MD
- Sponsor
- Department of Energy, Washington, DC
- Report
- DOE/CE/40637-T7, April 1989, 180 p.
- Distribution
- Available from National Technical Information Service
- Contract
- DE-AC02-83CE40637
- Keywords
- combustion | drying | drying rate | char | experiments | burning rate | mathematical models
- Abstract
- The fundamentsls of kraft black liquor combustion are being studied in a five year project. The work is being carried out for the U. S. Department of Energy by The Institute of Paper Chemistry (IPC) and the National Bureau of Standards (NBS), now the National Institute of Science and Technology (NIST). This report covers the completion of Phase 1 (In-Flight Processes) and initial results on Phase 2 (Char Burning) and Phase 3 (Fume Processes). The primary in-flight processes are drying and volatiles formation. Drying rate data could be interpreted with simple heat transfer models. Expansion of the drops during drying is significant and has a storng influence on drying rate in a high temperature environment. Char bed burning was studied using a char burning furnace module interfaced with the in-flight module on the IPC flow reactor. Initial experiments were characterized by a lack of a steady-state burning period and by O2 stoichiometric control of the burning rate. Means for overcoming these problems were defined. A nonintrusive laser polarization ratio technique to measure fume particle size was successfully demonstrated. Continuing work on the project will focus on char bed burning (Phase 2), fume production and deposition during bed burning (Phase 3) and on process synthesis. Mathematical models of the burning of individual black liquor drops and 3-dimensional model simulations of recovery furnaces will play a key role in transferring the fundamental knowledge gained in this study to the industry.