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Kraft black liquor recovery in a fluidized bed: Part I — A review
Author(s) -
Fallavollita J. A.,
Mujumdar A. S.,
Avedesian M. M.
Publication year - 1987
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450650515
Subject(s) - black liquor , kraft paper , waste management , dewatering , kraft process , boiler (water heating) , sulfur , chemistry , pulp and paper industry , fluidized bed , pyrolysis , combustion , environmental science , process engineering , engineering , lignin , organic chemistry , geotechnical engineering
The Tomlinson recovery boiler has been the mainstay of the kraft pulping industry for over fifty years. It is clear, however, that the main drawbacks to this process are the large capital costs of new plant and the smelt‐water explosion hazard. This paper examines some of the fundamental scientific information which supports the concept of fluid bed gasification as an alternative to the Tomlinson boiler. It is shown that a knowledge of thermodynamics is useful but insufficient to completely understand the behaviour of the inorganic sulfur species during pyrolysis and gasification of kraft black liquor. Recent key experimental investigations at McGill have demonstrated that solid state reduction of sodium sulfate to sodium sulfide is feasible.