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Energy efficient bio fuel drying with an open absorption system Parameter study in order to reduce investment costs

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  • Johansson, L.
  • Westerlund, L.

Abstract

A pilot plant using the open absorption system for drying of timber and bio fuel has been realized at a sawmill located in the northern part of Sweden. The technique decreases the energy demand for the dryers considerably and the system has an availability of about 8000 h per year. Compared with other drying techniques, the investment cost is high due to large airflow and therefore large apparatus. The main part of the investment cost, i.e. about 70% originates from the bio fuel dryer and the absorbers. In order to decrease the initial cost a parameter study has been made to investigate the possibilities to reduce the airflow of the drying process, i.e. bio fuel dryer and absorber. Parameters studied are drying temperature, salt concentration and cooling of the airflow during the absorption process. Measured values from the pilot plant have been used as a reference case. The results show that it is possible to decrease the airflow by 31% when using a higher drying temperature. Higher salt concentration decreases the airflow by approximately 32% and cooling during absorption makes it possible to decrease the airflow by 50%. In order to minimize the airflow, the three parameters were combined. In this case it is possible to decrease the airflow by approximately 60%. The electrical input for the plant is also high due to large air and solution flows. By decreasing the airflow, the required electrical input will also decrease since the fan power is proportional to the volume airflow. The results clearly show that it is possible to reduce the airflow and therefore the investment costs compared with the pilot plant.

Suggested Citation

  • Johansson, L. & Westerlund, L., 2000. "Energy efficient bio fuel drying with an open absorption system Parameter study in order to reduce investment costs," Applied Energy, Elsevier, vol. 67(3), pages 231-244, November.
    • Handle: RePEc:eee:appene:v:67:y:2000:i:3:p:231-244
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    References listed on IDEAS

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    1. Westerlund, L. & Dahl, J., 1994. "Absorbers in the open absorption system," Applied Energy, Elsevier, vol. 48(1), pages 33-49.
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    Cited by:

    1. Men, Yiyu & Liu, Xiaohua & Zhang, Tao, 2021. "A review of boiler waste heat recovery technologies in the medium-low temperature range," Energy, Elsevier, vol. 237(C).
    2. Yang, Bo & Yuan, Weixing & Fu, Lin & Zhang, Shigang & Wei, Maolin & Guo, Dongcai, 2020. "Techno-economic study of full-open absorption heat pump applied to flue gas total heat recovery," Energy, Elsevier, vol. 190(C).

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