2005年6月 紙パ技協誌


Development of Large Scale Nickel-metal Hydride Battery

Kazuo Tsutsumi
Advanced Battery Project Section, Planning & Control Department,
Corporate Technology Division, Kawasaki Heavy Industries, Ltd.

 Large scale nickel-metal hydride battery is developed for industrial use as a power source and a energy storage. Nickel-metal hydride battery can discharge at high rate and discharge most of energy stored in the battery with long life.
 When using this battery for several kind of electric power generator we can obtain high total generating efficiency, for example, wind power generator.
 Large scale nickel-metal hydride battery has no dangerous substance, toxic metal and welding so recycling of battery is safe and easy.

The Latest Technologies for Energy Saving
―Reduction of Energy Consumption for Pulper, Screen and Refiner and Stock Preparation System to Contribute to Energy Reduction―

Takeshi Kanazawa
Aikawa Iron Works Co., Ltd.

 In Japanese pulp and paper industry, various examinations have been performed for the purpose of 10% of further energy-saving achievement by 2010, which was scheduled based on the commitment at the Kyoto International Environmental Meeting at several years ago. This paper introduces new technologies for energy saving for pulping, refining and screening, which are key components to achieve further power reduction at stock preparation field, and also proposes some stock preparation systems to contribute further energy-saving.

The Design Concept of the Saving Energy for OCC Screening System

Toshio Dousaka and Iwashige Naoyuki
Voith IHI Paper Technology Co., Ltd.

 VIPT can offer the most suitable engineering for customer's needs through the advanced technology which is integrated with VPT's. world-wide defacto standard technology and IIM's good experience and know-how created under the long term marketing.
 This time, we wish to present a new OCC system which is focused on energy-saving with our integrated technology. We believe, we can present a new design concept of modern OCC system which can execute not only the low-energy-consumption but the high-quality too.

Energy-Saving by Introduction of High Efficiency Refiner for RGP
- Energy-Saving Examples by Low Speed Refiner -

Keisuke Irikawa
Iwanuma Mill, Nippon Paper Industries Co., Ltd.

 With recent rise of market demand for environmental protection and saving resources, Nippon Paper Industries Iwanuma Mill has set up an environmental action plan concerning "the achievement of sustainable society."
 This mill produces 55,000t of paper mainly newsprint per month based on this environmental action plan. Our newsprint contains kraft pulp, recycled pulp, and mechanical pulp as main materials resulting 75% or more of recycled pulp, 5-10% of kraft pulp (NBKP), and the remaining is mechanical pulp which is produced on site as RGP (Refining-GroundWood-Pulp).
 Mechanical pulp, such as RGP, is pulp which needs an enormous amount of electric power as a feature of its production. However, power consumption was greatly reduced through repeated reconstructions, including stock flow change and introduction of new equipment.
 This report describes a series of energy-saving examples achieved by reconstruction of RGP process.

Energy Saving with Cl & K Removal System Using Ion-Exchange Resin

Youichi Kataoka
Niigata Mill, Hokuetsu Paper Mills, Ltd.

 In the process of Kraft Chemical Recovery Cycle, Chlorine (Cl) and Potassium (K) entering with raw-material wood chip are gradually accumulated and concentrated during continuous operation. The plugging issue of carryover particles and dust in the Recovery Boiler is caused by decreasing melting temperature of dust along with increasing concentration of Cl and K in the Black Liquor. At the same time, fouling and corrosion at the super heater of Recovery Boiler is apprehended.
 To avoid above problem, proper portion of recovered Electrical Precipitator Ash was deserted from recovery cycle. We have investigated conventional crystallizing method system, however, this system is required to operate large sized freezing machine and spend huge amount of electrical energy. Therefore, we have developed new method expected lower energy consumption.
 In this manuscript, actual operation data from Cl & K Removal System using Ion-exchange Resin developed and installed at Niigata Mill are introduced. As the result of operation, plugging issue at the tube of the Super-heater was excellently decreased and large amount of steam reduction for the Sootblower have been confirmed.

Energy Saving by Introduction of the Gas Engine Generating System

Tadashi Arifuku
Yashio Mill, Rengo Co., Ltd.

 Recently, increasing the demands on environmental conservation, Rengo has been working actively on resource and energy savings based on ‘Eco-Challenge009’ which is our environmental target. As part of our efforts, the Paperboard Manufacturing Department has set the target to reduce the ratio of CO2 emission at the rate of 1% every year.
  Since Yashio Mill introduced gas engine generating system instead of conventional and low efficiency gas boiler and steam turbine generating system, we introduce the way and result of energy saving by taking this system as a case.

Steam Turbin for Driving Fan of Incinerator

Masaaki Koito
Fuji Mill Oji Paperboard Co., Ltd.

 Our Fuji-Plant is located in Fuji-City, the central part of Japan, near Mt. Fuji on the north side, near Suruga Bay on the south side. Our Plant is also a main production factory which has two sets of NO.8・10 M/C and is a large-scale factory with the quantity of production representing Japan.
 In addition, we have a fluidized-bed type garbage incineration plant for the waste generated at a materials process which capability is BD40 t/day (includes waste heat boiler with max flow rate 5.7t/h). Steam from the waste heat boiler had been controlled at constant pressure (1.75Mpa) by the valve in drum to be used for dry process of M/C line. This time we tried to improve to save energy by another method. There we observed the electricity to look into the fan motor which needs much energy in some facilities.
 We present a new method as below of more effective use for steam that 2 steam turbines are installed and connected to the FDF(110kw-2P) motor and IDF (90kw-4P) motor to assist the power. It brought the good effects to save energy.
 This system has very superior points in that we can use the rest of steam effectively and can save big energy under rated condition. In addition, it also has the characteristics of easy maintenance and easy start-up.
 Now although the capability of 100% cannot be demonstrated from short of rated steam condition, we will be able to save the energy for the amount of electric power 130kw/h equal to 10,000,000 yen if the combustion of an incinerator would be stabilized, the amount of steam would be secured and could be run during a year.
 We are willing to try more to save energy in the near future because the increase of the energy cost gives the large influence to the factory profit.
 We would like to improve factory employee's consciousness further in the future and to promote the energy-saving activities.

Energy Saving Project by Renovation of Stock Preparation System

Hidetsugu Ueda and Seiji Tomita
Nippon Daishowa Paperboard Kanto Co., Ltd.

 Nippon Daishowa Paperboard Kanto (NDB Kanto) Co., Ltd., Soka Mill, has completed modification project of the existing OCC recycling system for the purpose of the power saving.
 As result of reconstruction of the production map in NDB's four production companies, No.1 Paper Machine in Soka Mill has been changed to produce the corrugating medium only.
 In this paper, two topics are presented in connection with the above modification;
1) Field test report of newly developed Low Power (LP) Screen of which trial was carried out     jointly with the screen manufacturing company.
2) At the same time that LP Screen has been adopted in the existing OCC line, not only the      current MF (Multi Function) Screen has been relocated but also the other fine screens have been  modified to the bar basket type, and as the result, the extensive energy saving has been       achieved.

Recent Paper Dryer Enclosed Hood
- High Dew Point Enclosed Hood and Machine Room Ventilation System -

Haruo Tanaka

 Pulp and paper industries are the typical industry of plenty energy consumption type. Therefore, every paper mills have been endeavoring all efforts for the higher efficiencies in production, energy saving in all processes as well as high yields and waste paper recycles etc.
 However, the more severe energy managements have been required owing to the high speed production under the broaden width of paper by giant paper machines.
 Simultaneously, the long-life renovation of main machine and environmental improvement in machine room shall be considered according to the recent change of operation condition.
 Siratori have been endeavoring to cultivate new technologies and know-how based on many delivery results regarding High Dew Point Enclosed Hood and Environment Improvement System by Machine Room Ventilation System.

Advanced Press Felt Management for Improved Quality and Paper Machine Performance

Hideomi Uchikawa
Voith Paper Automation Japan Ltd.
Raymond P. Shead
Voith Paper Automation GmbH & Co. KG

 This paper describes a new press felt measurement system that is designed to assist the papermaker optimise the press section set-up and its routine operations.
 The measurement provides both profile and trend information for water weight, permeability and temperature of the individual felts. By combining this information with moisture measurement directly following the press section, it can help improve product quality, felt performance and process efficiency while reducing the energy consumption of the pressing and drying operations.

Treatment Capacity of Rotary Press Filter
-Result of Operational Research on Actual Facilities-

Koji Matsumoto
Application Development Section Process Engineering Department Machinery & Equipment Division, TOMOE ENGINEERING CO., LTD.

 Several years have passed since the Rotary Press Filter was first introduced to Japan and Tomoe Engineering started its production and sales, and its high dewaterability has been proved through test data of various materials. Further, the Rotary Press Filter has features superior to other dewatering machines such as simple structure, space saving, low power and less washing water requirement, besides dewaterability. Number of installation of the Rotary Press Filter is increasing year by year and we have installed 5 units for papermaking wastewater and 27 units for other kinds of applications in Japan. We expect its number will increase further.
 In this report I will introduce a result of research made for about a month on the treatment capacity of the Rotary Press Filter in operation at papermaking company “A.” I will also introduce a result of research on changes of the feed sludge condition and cake moisture for two days during the one-month research period. This is the first time to release the dewatering data of papermaking wastewater sludge obtained at the actual facilities.

Application of SAQR to Modified Cooking Processes (PARTU)

Junji Tanaka
Kawasaki Kasei Chemicals Ltd.

 SAQR has been used as a cooking additive in many KP mills. This process is known as “Quinone Cooking”. In order to apply SAQ to recent modified cooking process, more effective condition for SAQ is investigated. The following results have become clear with the small digester developed by KKC in which addition and extraction of cooking liquors are possible.
1) SAQ’s effect in each combination of penetrating conditions (alkali concentration, temperature,   and time) was observed as the same as in conventional one (non-separating liquors). Also SAQ  will possibly be more effective than in conventional process under some combinations of the    penetrating conditions.
2) SAQ penetrated enough into chip even at low temperature and short time. Most amount of SAQ  remained in chip after black liquor was extracted from the digester. But dispersed anthraquinone  was extracted more than SAQ into black liquor.

Production Methods of High Viscosity Kenaf Bast Pulp for Papermaking

Wiwin Suwinarti, Yu Wang and Kazuhiko Sameshima
Faculty of Agriculture, Kochi University
Zhou Cheng
School of Life Science and Technology, Tongji University (Shanghai)

 Kenaf bast fiber was treated successively by ammonium oxalate, sodium hydroxide and sodium chlorite at different order and conditions in three methods, A, B and C (Table 1). The characteristics of pulp and paper were determined by various methods including TAPPI test methods. The Kenaf-B, derived from the method B, showed the longest fiber length as length weighted average which confirmed that this treatment is the best preparation method for fiber length measurement. However, the viscosity and the paper strength properties of Kenaf-A was the highest if compared to the other two methods. Comparison of the viscosity and the strength properties with other pulps (commercial kenaf bast and wood pulps) indicated that all the three methods have superior properties but the Kenaf-A is the best pulp so far.

Keywords: kenaf, bast fiber, viscosity, fiber length, paper strength