PAPERmaking! FROM THE PUBLISHERS OF PAPER TECHNOLOGY Volume 5, Number 2, 2019
Industrial verification of energy saving for the single-tier cylinder based paper drying process, Xiaobin Chen et al, Energy , 170, pp.261-272. The paper drying process has the highest level of energy consumption in the pulp and paper production process. Analysis and optimization of the energy system during the paper drying process is critical for improving the energy efficiency of the entire paper mill. In the existing model for the paper drying process, the solution requires accurate boundary conditions such as the air temperature and humidity of the pocket area and the cylinder surface temperature, which are very difficult to obtain in the papermaking process. This can result in significant deviations between the model solution and the actual production process. This paper focuses on the single-tier dryer cylinder-based paper drying process that has been widely used with high-speed papermaking machines in recent years. A mathematical model is proposed based on real-time data. The verification via industrial production demonstrates that the proposed model is reliable for the paper drying process. Based on the simulation results, two optimization operations have been proposed. The energy consumption decreases from 1.51 t steam/t paper to 1.44 t steam/t paper, 4.6% of the steam and 1.26 × 10 6 RMB can be saved for a medium-scale paper mill with the annual production capacity of 10 5 t paper. Life cycle analyses of alternative fibers for paper, Alice Favero et al, Journal of Advanced Manufacturing and Processing , 1 (3), e10023. This study provides a quantitative and qualitative review of life cycle analyses of alternative fibers for paper production. Alternative fibers include both virgin fibers from rapidly renewable sources (hemp, flax, Arundo donax , bamboo, kenaf) and agricultural residues (wheat straw and bagasse). A comparison is made with conventional wood fibers, including northern and southern softwood and eucalyptus, and with recycled fiber. The evaluation characterizes the major environmental impacts of alternative fibers that have been identified in previous studies. The assessment of the literature indicates that a substantial portion of the environmental impacts of paper products is associated with the pulping and paper Ǧ making processes across all fiber types. Alternative fibers may have somewhat different pulping impacts, although the differences are generally not large in the overall impacts of the life cycle. Resource value flow analysis of paper-making enterprises: A Chinese case study, Zhen Li et al, Journal of Cleaner Production , 213, pp.577-587 . Papermaking enterprises are currently under both environmental pressure and economic pressure for sustainable development in China. Thus, the efficiency, effectiveness, and benefits of resource utilization need to be improved. High-consumption and high-pollution companies should manufacture paper using sustainable methods. This study highlights a resource value flow analysis from the circular economy perspective, developing an extension of material flow cost accounting and modifying it by accounting for environmental damage as well as economic benefits. With reference to the Plan-Do-Check-Act cycle, this specific case study was conducted to verify the comprehensive utility of resource value flow analysis by establishing decision-making prioritization according to the dualistic diagnosis of “internal resource loss–external environmental damage costs.” In general, applying a resource value flow analysis can both reduce resource consumption and minimize environmental damage, enhancing the sustainable development of a process industry with limited resources.
Technical Abstracts
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