Influence of short-term variations on energy-saving opportunities in a pulp mill |
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Authors: | Jörgen Persson Thore Berntsson |
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Institution: | 1. Department of Endocrinology, Affiliated Hospital of Weifang Medical University, Weifang, China;2. Department of Pathology, Affiliated Hospital of Weifang Medical University, Weifang, China;1. Departments of Psychiatry, Chonnam National University Medical School, Republic of Korea;2. Departments of Caridology, Chonnam National University Medical School, Republic of Korea |
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Abstract: | Significant opportunities for energy savings have been identified in the hot and warm water system of a kraft pulp mill. The energy-saving opportunities found at the mill studied, 15.7 MW of steam savings and 24.8 MW of usable excess heat, correspond to 18% of the mill's total steam use. Short-term variations in the process have been studied in order to identify and quantify the influence of these variations on the energy-saving opportunities. Daily and 10-min averages of measured data were used as varying input data in the retrofitted heat exchanger network. When the short-term variations were considered, the total energy-saving opportunities fell by 8% when daily averages are used and by 11% when 10-min averages are used. At least 65% of the influence of short-term variations was detected when seasonal variations are considered. |
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