Vol.67, No.1 Abstracts

Benefits of Introducing Optical Caliper Sensor

Motonori Tahara
Paper and Web Solution Dept., Yokogawa Electric Corporation

  Caliper measurement is unique from others in the sense that it pinches the paper web between the sensing planes for the measurement purpose although a paper quality control system is associated with various measurement functions. This has often become the issues in paper production process making holes and marks by sensing plane touching the paper. In order to solve these issues, non-contacting caliper sensors has been introduced applying measurement principles such as laser measurement. However, these sensors are yet to be utilized for the continuous measurement and control of production lines because they still have some essential technical issues have to be solved.
  In such background, Yokogawa Electric Corporation started the development of Optical Caliper Sensor applying the confocal technology and a chromatic aberration for the measurement principle of the sensor. Since the Optical Caliper has actually been tested on line at one of paper mills in Japan during January 2008, increasing the number of customers has approved this sensor as the solution to solve their issues. Currently in Japan, all the Optical Caliper installed in Newsprint and White board Machines are utilized for the caliper profile control and have achieved zero-holes, zero-marking and zero-curl related sheet brake.
  This paper introduces starting with the history of the caliper sensor, explains the measurement principle and tuning method of the Optical Caliper Sensor, and finalizing with the benefits of introducing this sensor in Newsprint and White Board applications.

High Dew Point Type of Totally Enclosed Hood System and Relative Equipments

Takashi Hatogai
Engineering dept., SHIRATORI Engineering Co., Ltd.

  The Paper & Pulp Industry is obviously one of the most energy consuming one among all of the industries. It has been pursuing both recycling of waste paper and utilizing natural resources in various aspects. Especially, gHow to save energy efficientlyh is a vital target because of the recent rise of material cost and crude oil price.
  Above all, energy consumption in dryer part in the paper production machine is the most focused whose consumption rate occupies more than half of the total energy consumed. Every paper manufacturing company is repeating its full efforts so that energy consumption rate may be minimized. Also they are pursuing longer life-time of their facilities as well as higher efficiency of maintenance and improvement of their environmental condition. Under such tendency, upsizing of machines with higher speed for wide papers has been widely promoted. Also, it sometimes required remolding of facilities such as hood system and ventilation equipment for reinforcement.
  We, Shiratori Engineering, who has cultivated lots of technologies and know-how, have sufficient delivery experiences of the hood system to various customers. We herewith would like to explain the essence of gHigh Dew point type of Totally Enclosed Hood System and Relative Equipmentsh.

Technological Transition of Quality Control System

Tomohiro Mineo
Paper and Web Solution Dept., Yokogawa Electric Corporation

  QCS(Quality Control System) was developed in the end of 1960s, and it had come into wide use in Japan during 1970s through 1980s. Although QCS has started as a mere measuring instrument, its first installation has drastically changed the works related to the paper production. Therefore, in some cases, people even refers to QCS as, gThe instrument that has altered the paper manufacturing procedure.h QCS has now become an indispensable system for manufacturing the paper in the modern days of paper production.
  This report introduces technological transition of QCS focusing on recent 30 years after it has come into wide use, and also mentions on the origin and foresight of this equipment.

Technological Advance of Drive System for Paper Manufacturing Facilities

Mitsuhiro Shibata
Paper & Material Handling Systems Engineering Department, Industrial Automation & Drive Systems Division, TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION -TMEIC-

  There are a large number and a wide range of capacity of motors and drives applied to pulp and paper industries. Variable-speed drives are widely used for not only line-drive applications such as paper machine, winder and off-machine coater but also single-drive applications as boiler and paper machine auxiliary equipment. High performance and large-capacity variable-speed drives have been developed with advanced technology and innovation, changing from DC to AC, analog to digital control. This technological innovation includes digital technology with power device, main circuit and microprocessor, control technology with AC vector control and system network technology with high-speed communication.
  This article describes the technological advance and history of drive system in the field of paper manufacturing facilities, introducing the latest AC drive system.

Kishu Mill: Reconstruction of Flood Damage from Typhoon No.12, September 2011

Tomoya Segawa
Kishu Mill,Hokuetsu Kishu Paper Co.,Ltd.

  On September 3rd of year 2011,the typhoon No.12 which landed on east of Kochi Pref. caused unpredictable amount of rain on Kii peninsula. The rain affected discharging of dam built upstream of Kumano River and record-breaking water level flooded the intake facility of industrial water, placed approximately 6km from the mill, and in house facilities such as KP, electric room and equipment of boiler. Mill had stopped its operation for 16 days.
  In this report, we will put focus on restoration and countermeasure to the flood.

Power Supply Strategy of Nippon Paper Group

Hideharu Yoshimura
Technology Research & Development Div., Nippon Paper Group,Inc.

  The Nippon Paper group started the energy business promotion office for the purpose of using surplus electric power effectively in December, last year.
  The strategy of the electric power business of the contents examined in order to promote the energy enterprise which harnessed the strong point of the group, and a group is introduced.

Outline of the Tomakomai Mill Hydropower Station

Luning Zhang
Tomakomai Mill, Oji paper Co., Ltd.

  Oji paper Tomakomai mill has nine hydropower stations in Hokkaido. Five of them are located in Chitose, two of them in Eniwa and other two of them in Niseko. The oldest one, Chitose No.1 power station was built as a power source of the Tomakomai mill in 1910. With expansion of the mill, other four power stations were added in downstream, in 1916 to 1941.
  Even now these power plants are still working for power supply to the Tomakomai mill by executing careful maintenance. However, the plants have been deteriorating because they have been operated for 70-100 years. In order to intensify power generation business and contribute to low carbon society, Oji paper will refresh those hydropower stations in coming years.
  The refresh construction includes renewal of control drive unit, inlet-valve, guide-vane and runner. In this report, we introduce outline of each power station and brief overview of the refresh construction.

A Summary and Operating Experience of Biomass Incinerator Plant

Daisuke Ishimura
Tonegawa Division, Rengo Co., Ltd.

  With the aim of reducing CO2, saving energy and preserving the environment, we installed a biomass incineration plant within the Tonegawa Division in 2012.
  At the former rotary kiln incinerator plant, waste heat from incinerating industrial wastes was not recovered and energy was not used efficiently. However, at the biomass incineration plant, energy is recovered by steam. This has allowed fuel (LNG) for boilers used as in-house power generators to be reduced and CO2 emissions to be cut significantly. After starting the operation of the biomass incineration plant, the volume of fly ash and bottom ash has increased, but total volume of industrial wastes has been reduced.
  We intend to work hard to see to the safe operation of the plant.

Technology Development of Bioethanol Production from Woody Biomass

Atsushi Furujyo
Bioethanol Research Section, Oji Paper Co., Ltd.

  Bioethanol produced from biomass is expected to become a sustainable energy source in the future since bioethanol has advantages over fossil fuels. Namely, bioethanol is a natural and renewable form of energy that does not increase atmospheric carbon dioxide levels, because burning biomass releases carbon dioxide that is largely balanced by the carbon dioxide absorbed in its own growth. In Brazil and the United States, bioethanol produced from sugarcane, corn and other crops is already being used as automobile fuel by blending with gasoline. Increase in bioethanol production may, however, leads to increase in food prices due to the competition with food production. For this reason, research on cellulosic bioethanol is being conducted, mainly in Europe and the United States, with the objective of realizing its production.
  We report herein our companyfs research on development of bioethanol production technology with the combination of a mechanochemical pulping pretreatment technology, a simultaneous saccharification and fermentation technology using own heat tolerant yeast and an enzyme recycling technology, in which woody biomass (e.g., fast-growing trees and forestry residues) is used as a raw material to obviate competition with food production.

Development of Methane Fermentation Technology for Wastewater Treatment
-Investigation of Method to Prevent Flocculated Methanogens from Becoming Smaller by Addition of Starchy Wastewater-

Isao Onodera
NPI Research Lab., Nippon Paper Industries Co., Ltd.

Lately methane fermentation technology is widely applied in many industries because of the recent development in this technology has made wastewater treatment highly effective. One of the advantages of this technology is to recover energy as biogas from organic compounds in wastewater. This paper describes application of methane fermentation technology to KP mill evaporate condensate at Nippon Paperfs two KP (kraft pulp) mills, the Yufutsu plant of Hokkaido mill and Iwakuni mill. Through the experience in actual operation of methane fermentation, it was recognized that there was a problem of overflowing granule from the reactor caused by upward flow in the reactor.
  In order to look into the problem, we compared the properties of granule in Yufutsu plant with those in food mill which already established a stable process in methane fermentation treatment. As a result, filamentous acetic acid-degrading methanogens (Methanosaeta) was mainly observed in food millfs granule, while spherical methanol-degrading methanogens (Metanosarsina) was mainly observed in Yufutsu plantfs granule. This difference of methanogen species, which was caused by methanol treatment, is presumed to weaken the cohesive force of granule, consequently making the granule remarkably fine. On the basis of the result of this investigation, we studied of method to prevent flocculated methanogens from becoming smaller by lab.-experiment. It was found that the addition of starchy wastewater was very effective. Trial at commercial plant showed that the addition of starchy wastewater increased Methanosaeta and granule became bigger and heavier.