Research on Combustion of Black-Liquor Drops

Published

June 1, 1999

Author(s)

A Macek

Abstract

Black liquor, the major by-product of the kraft process for production of pulp, is one of the most important industrial fuels. It is burned in recovery boilers in the form of large spray drops (mm), with the objective of simultaneous recovery of heat and chemicals (sodium and sulfur). Even though black-liquor combustion in boilers has been practiced for over half a century, research efforts toward improvement of combustion efficiency and abatement of environmental emissions are of much more recent. The present paper addresses a specific aspect of that research, namely, elucidation of processes which occur during combustion of black-liquor drops in boiler-gas streams. The paper (a) gives a brief description of the kraft process, (b) reviews the experimental and theoretical (modeling) research advances on combustion of kraft-liquor drops during the 1980s and 1990s, [c] reexamines the results of an earlier combustion study in which black-liquor drops were observed in free flight at temperatures near those in recovery boilers, and (d) recommends input for the modeling of in-flight combustion of kraft-liquor drops in recovery boilers.

Citation

Progress in Energy and Combustion Science

Volume

25

Issue

No. 3

Pub Type

Journals

Keywords

black liquor, combustion, draft process, pulp & paper processing, recovery boiler

Citation

Macek, A. (1999), Research on Combustion of Black-Liquor Drops, Progress in Energy and Combustion Science (Accessed December 26, 2024)