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for achieving savings. We conclude that the drying section has three of the most important fuel-saving technologies: cost-effective and significant energy and CO 2 emissions savings in the steam and condensate loop and enclosure hood. Calvo and Domingo [40] analyzed the importance of the monitoring and control of the drying parameters to achieve an efficient use of the energy in the drying process of the paper and the savings obtained in both energy used and CO 2 emissions by improving the control of the parameters involved in drying enclosure hood sections. A stricter environmental legislative framework can achieve emissions reductions if it considers the implications of the regulatory framework on industrial activity. Silvo et al. [41] studied the influence of European IPPC regulations in Finnish pulp and paper mills with regard to BATs. Wang et al. [42] studied the effect of stricter environmental regulations in Shandong Province and found that most of the efficiency indicators (except CO 2 emissions) improved significantly with the implementation of stricter regulations. These facts necessitate a review of the equipment and operating parameters associated with papermaking, particularly with regard to the energy efficiency of the drying process. Control of the CO 2 emissions associated with energy consumption is even more necessary. As illustrated above, CO 2 emissions are significantly affected by the condition and operating parameters of the drying process. Placing a limit on CO 2 emissions may represent an actual limit on facility use. Thus, the importance of monitoring and controlling such emissions is clear. In addition, we need to know the influence of maintenance tasks in this type of facility, which has been studied by analyzing the evolution of some typical indicators such as the overall equipment efficiency and mean time to failure [43] or the influence of downtimes on CO 2 emissions [21]. Although Nakajima [44] showed the advantages of involving workers in maintenance tasks, the effect of the involvement of workers on the definition of new indicators and the analysis of its evolution has not been considered in the literature on papermaking. 1.2. Objectives In 2017, the deficit of the rights of issuance in the industrial sectors, the verified emissions in 2017 versus the allocation in 2017 increased to 8.3% according to the European Commission [45]. This trend will increase due to a progressive reduction in allocation. Reductions in emissions have been frequently associated with the adoption of new technologies and/or the replacement of fossil fuels with renewable energy sources. Approximately 70% of the total primary energy in China comes from coal according to Zhang and Liu [46]. In China, Peng et al. [47] pointed out that the savings in total energy consumption was due mainly to technology updates, policy changes, and fuel substitution. Another measure for reducing emissions and improving energy efficiency is declaring many plants obsolete and decommissioning production facilities. Regarding the pulp and paper industry in China, the authors indicate the potential for CO 2 reductions through energy efficiency improvements and the application of wide-scale development of the BAT [48]. The predominant fuel used in China is coal. A priority strategy for reducing CO 2 emissions is fuel substitution. The implementation of maintenance related to the improvement in production indi- cators [7,8] and the relationship of sustainability with OEEs analyzed by Domingo and Aguado [9] do not specify maintenance guidelines that jointly improve the efficiency and sustainability of the production process. This article adopts the methodology of the case study to identify methods for reduc- ing emissions without substituting machinery or fuel sources. The case study is widely accepted in the scientific literature, and Fidel [49] recommends its use when there are many factors and relationships in the phenomenon to be studied and when the factors or relationships can be directly observed or measured, and without these premises, you can determine its importance. The systematic collection of data provides rigor to research and avoids biases in interpretation, the lack of which is a weakness sometimes attributed to this methodology, but this can be addressed, according to Flyvbjerg [50].
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