Fujinomiya offi ce, belonging to Fuji mill, Oji Materia, is located in 8 km northern area from Fuji mill. After two paper machines stopped operation at Fujinomiya offi ce in 2014, industrial water which had used to make paper production was left over and discharged into the river, therefore, we had to consider how to use this left water eff ectively in another way. As a result of consideration, we introduced Micro hydro power plant manufactured by ANDRITZ K.K, a leading supplier for hydraulic power generation, and have been able to obtain electric power since 2017.
In this paper, we will explain our experience of introduction of this plant.
The kraft pulp mill is consisting of various fi berline processes, recovery processes and various sub–systems as well as auxiliary equipment.
By upgrading and integrating the mill process and through optimization, it will be possible to create more green energy and more effi ciently from the biomass. The modern kraft pulp mill is also producing bioproducts that are also integrating the mill process. Andritz has the sate of art for the integrating the mill process to produce more green energy and bio products that contributes to the reduction of greenhouse gases and pulp economy.
In order to reduce the energy cost, we introduced a MPC（Model Predictive Control）as a multivariable model predictive control system for the automatically avoiding operation constraints and the maximizing power generation output. As a result, we got more than 3,000 kW output compared with last year.
In the private power utility, there are various restrictions under the operation due to the seasonal factor and the demand change of manufacturing process and the operators are always required to adjust the output balance. However, it is difficult to keep fine-tuning constantly while the operator doing other several taske, so there is inherent loss of operation opportunity that “it cannot be operated even if it is physically possible to increase”.
In our case, we developed the control system which maximize the output of the facility constantly and keep the each parameter within the upper and lower limit range, such as steam, condensate, fuel, power etc. We succeeded in increasing the amount of power generation by systemizing the operational know-how and reducing the loss of operational opportunities.
To remove dusts on the boiler heating surface is effective to improve the efficiency of power generation in municipal solid waste incineration plants. But it is difficult to remove dusts on the radiation and convection chamber of the boiler during operation, so that the flue gas temperature at outlet of radiation chamber becomes high and high. To solve these problems, We tried two types new boiler cleaning systems and have good effects.
We Kishu mill has three boilers, biomass boiler（N2 boiler）and recovery boiler（No. 6 boiler） for daily operation and heavy oil boiler（N1 boiler）for preliminary. The steam generated from the boiler is used in whole mill through turbine（N1 turbine）．In regard to power, we also use purchased power due to lack of power generation.
The biomass boiler（N2 boiler）started operation in July 2008, and has been in operation for 10 years. As we have implemented some energy saving activities, we will introduce some of examples that a great effect has obtained.
Utilization of renewable energy, which is included in the main measures in the Fifth Energy Basic Plan announced by the Agency for Natural Resources and Energy on July 3, 2018.
In order for many paper manufacturers to support their contribution to the regional economy through “entry into new businesses and development” as set forth in their business plans, we can propose to build an overall fuel storage, transportation and supply system that covers large–capacity storage silos for biomass power generation fuels（wood chips, wood pellets, PKS, etc.）and design of a transportation system that integrates necessary functions within a limited site and completion of large silo construction using a proprietary spiral welding method in a shortest fabrication period make it possible to greatly reduce the cost of plant construction.
In addition, this paper introduces the economic effect of the feed water preheating system by waste heat recovery from boilers, which makes it possible to realize energy saving by high–efficiency operation of fossil fuels, which is also one of the main measures.
We expect that by building a system with utilizing those original technologies and extensive knowledge, we can contribute to the sustainability of the globally expanding pulp and paper industry through the revitalization of local economies.
Enzyme has been used in various process of paper making. For example, xylanase is used in pulp bleaching, amylase is used for viscosity modifi cation of size press starch, laccase is used to remove lignin for bio︲bleaching, and cellulase is used in refi ning and drainage of paper making.
Hercobond 8922 is a cellulase enzyme developed by Solenis which accelerates fi brillation of pulp fi ber, and improves paper strength. Consequently, we succeeded in saving of energy cost by reduction of DDR load and in improving of pulp quality as well. This article explains the results of improvement of paper strength at laboratory test and case histories at mill trial.
OREGE S.A., founded in 2006 in Paris, France, is an engineering and manufacturing company of wastewater and sludge treatment equipment. Orege spent 8 years in the research and development of their system before launching the sales of their equipment in the global market in the year 2015. Their［SLG］technology has 7 patents which enables to reform sludge in waste water, improves the efficiency of dewatering in latter process, and reduces the sludge volume as well as the coagulant agent consumption. ITOCHU Machine-Technos Corporation hereby introduces Orege’s technology for various applications including but not limited to those in the Pulp and Paper industries where a number of companies are trying to reduce coagulant agents.
Mino-gami（Japanese kozo paper） has been utilized in various ways to conserve cultural properties for many years. Especially, usu（thin）-mino-gami is frequently used as the first back lining paper of hanging scrolls in order to support the main paper with a painting or a work of calligraphy on it. Improvement of the usu-mino-gami quality will more contribute to preservation. In the first stage of our research, the purpose is to clarify the manufacturing conditions of high-quality usu-mino-gami produced with different sheet forming techniques. As a lining paper, usability and feedback from users were considered in this study. The results showed that the sheet formation measured based on light transmission homogeneity was ranked as papermaking experts Furuta, Hasegawa and a papermaking beginner in descending order of quality. This sheet formation result agreed well with the wet tensile strength of usu-mino-gami both sensorially evaluated and measured by a tensile tester with the Finch device. The wet tensile strength decreased as the concentration of alkali solution for moistening paper samples increased. Paper prepared from fibers after net washing and from a top portion of kozo branches had a relatively low wet tensile strength. About the relationship between the order of sheet forming and wet tensile strength, the sheet formation and wet tensile strength of paper improved in the sheet forming order presumably because long fibers were filtered and formed into sheets in early sheet forming and remaining short fibers and parenchyma cells composed the paper in late sheet forming.