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First version of this book was created as postgraduate lecture notes for Lappeenranta University of Technology’s special course of steam power plants. Kraft recovery has a special interest for that area. Around Lappeenranta there is more than three million tonns of kraft pulp produced each year.But as with anything ever written the contents of this book have nurtured for a long time. Ideas presented in the chapters have appeared elsewhere as individual papers or work documents. One of the most helpful episodes have been presentations and discussions during Pohto Operator training seminars and meetings of Finnish Recovery Boiler Committee. Input from those sessions can be seen in chapters dealing with high solids black liquor firing and handling. You who run recovery boilers, I salute you.
The purpose of this text is to give the reader an overview of modern recovery boiler operation and design. Most parts of the recovery boiler operation are common to boilers burning other biofuels. The furnace operation is significantly different. Oxygen rich atmosphere is needed to burn fuel efficiently. But the main function of recovery boiler is to reduce spent cooking chemicals. Reduction reactions happen best in oxygen deficient atmosphere. This dual, conflicting nature of recovery furnace makes understanding it so challenging.
Content:-
Preface
About the author
Nomenclature
1. PRINCIPLES OF KRAFT RECOVERY
2. RECOVERY BOILER DESIGN
3. MATERIAL AND ENERGY BALANCE
4. COMBUSTION OF BLACK LIQUOR
5. CHEMICAL PROCESSES IN FURNACE
6. DIMENSIONING OF HEAT TRANSFER SURFACES
7. RECOVERY BOILER PROCESSES
8. FOULING
9. FIRING BLACK LIQUOR
10. HANDLING OF HIGH SOLIDS LIQUOR
11. MATERIAL SELECTION AND CORROSION
12. EMISSIONS
INDEX
Appendices
Author Details
"Esa Vakkilainen" is a graduate of Lappeenranta University. He made his M.Sc., Licentiate and Ph.D there. He concluded his graduate studies by enrolling to Institute of Paper Science and Technology in Atlanta, USA. Esa Vakkilainen started his professional career in Lappeenranta University as an assistant professor (yliassistentti) of Power plants teaching and researching furnace heat transfer, optimization of combined cycle processes, district heating (a Finnish specialty) and combustion of biofuels.
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