Enhancement of the use of wood fuels in heat and power production in integrated pulp and paper mills

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Doctoral thesis (article-based)
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Date
2003-12-12
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Language
en
Pages
49, [65]
Series
Energiatalous ja voimalaitostekniikka. A, 11
Abstract
The drying of moist biofuels such as wood-based biomasses should be as effluent-free and as energy-efficient as possible in order to ensure the safe and economical operation of industrial CHP plants. This work presents a multistage drying system (MSDS), which provides significant benefits in comparison with earlier conventional single dryer systems. This new application is installed most promisingly in integrated pulp and paper mills. The MSDS, which simultaneously uses secondary process energy, as well as backpressure and extraction steam as the drying energy, enables a smaller volume flow of drying air than single dryer systems. Depending on the structure of the system, up to 100 % of the exhaust drying air can be utilized as combustion air. The use of MSDSs enables an increase in CHP plant boiler capacity, which in turn boosts the production of power and heat in combined heat and power (CHP) plants. Additionally, the improvement in CHP can be achieved with reduced organic emissions from moist biomass drying. Also, the amount of unburned organic compounds and of CO in flue gases from combustion is reduced as a result of the improved quality of the biofuels. When compared to direct steam drying, the MSDS also better minimizes, or even eliminates, the formation of organically loaded condensates in the drying operation.
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Keywords
multistage drying system, energy efficiency, combined heat and power production (CHP)
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Parts
  • Additional errata file available.
  • Spets J.-P., 2001. A new multistage drying system. Proceedings of the 1st Nordic Drying Conference. Trondheim, Norway, 27-29 June 2001, Paper no. 13. [article1.pdf] © 2001 SINTEF. By permission.
  • Spets J.-P. and Ahtila P., 2001. Preliminary economical examinations for a new multistage biofuel drying system integrated in industrial CHP-power plant. Proceedings of the 1st Nordic Drying Conference. Trondheim, Norway, 27-29 June 2001, Paper no. 14. [article2.pdf] © 2001 SINTEF. By permission.
  • Spets J.-P. and Ahtila P., 2001. A new multistage biofuel drying system integrated into an industrial CHP-power plant: description of process and performance calculations. Proceedings of 2001 ACEEE Summer Study on Energy Efficiency in Industry. New York, USA, 24-27 July 2001, Vol. 2, pages 67-78. [article3.pdf] © 2001 American Council for an Energy-Efficient Economy (ACEEE). By permission.
  • Spets J.-P. and Ahtila P., 2002. Improving the power-to-heat ratio in CHP plants by means of a biofuel multistage drying system. Applied Thermal Engineering 22, No. 10, pages 1175-1180. [article4.pdf] © 2002 Elsevier Science. By permission.
  • Spets J.-P. and Ahtila P., Reduction of organic emissions by using a multistage drying system for wood-based biomasses. Drying Technology – An International Journal, accepted for publication. [article5.pdf] © 2003 by authors and © 2003 Marcel Dekker, Inc. By permission.
Citation
Permanent link to this item
https://urn.fi/urn:nbn:fi:tkk-000937