2006年6月 紙パ技協誌

 
Results of the Fy 2005 follow-up to JPA's Voluntary Action Plan and Report of Energy Situation in the Pulp and Paper Industry in Japan

Kunihiko Aida
Japan Paper Association

 The Japan Paper Association (JPA) has been actively working to save energy since 1997 when it established its "Voluntary Action Plan on Environmental Issues". JPA declared its policy of restraining CO2 emissions as one of the actions: By 2010, reduce fossil energy consumption per product unit for paper products by 13% from that of 1990 level.
 Since FY1990, JPA has been following through on the actual results of the unit of energy in the year, and has been publishing its results compared with that in 1990. The following are the results for FY2004 and reports of energy situation in the pulp and paper industry in Japan.
 The survey also reported on energy consumption, CO2 emissions and the position of the pulp and paper industry in Japan as related information.


Reducing Distribution Loss by Control of Reactive Power

Tomoyuki Hosaka
Electric and Instrument Department, Yufutsu Mill, Nippon Paper Industries Co., Ltd.

 Useless energy has been consumed by the inefficiency operation of the departure supply of power distribution equipment in the Yufutsu Mill. The chance to aim the inefficiency operation was to have discovered that receipt point was LEAD10%. Afterwards, No.1 Generator was operating by the Power-Factor limitation control since the departure supply of power distribution flow was investigated, and it turned out that the outflow invalidity Reactive-Power in the receipt point was a surplus. The operation of 100% or more comes to cause the losses such as the generators and transformers though operating it with Power-Factor 100% in the belt because of the Power-Factor discount system in daytime is an ideal in Power-Factor of the receipt point.
 Therefore, the problem that the departure supply of power distribution equipment holds from an electric viewpoint is dug up, and it introduces "Reducing distribution loss by control of Reactive Power" executed in November, 2005 in this announcement.


HITACHI High-Voltage Motor Drive Energy Conservation Service-New Business Model「HDRIVE」

Takashi Yabutani
Information & Control Systems Div. Hitachi, Ltd.

 The industrial world in Japan including the pulp and paper has worked on conservation of energy for a long term after the oil crisis. As a result, it almost comes to the region in the limit about energy conservation by past methods.
 As for the user, the energy conservation was not enforceable because there was an economical restriction though the necessity was recognized. In such a circumstance. We inspired a new business model based on the user's needs.
 As the mechanism of concrete service, the user is do not need an initial cost to introduce the inverter, and, as a result, pays the service fee from a part ob the achieved advantage. It is a scheme to which our company bears a part of risk of the amount of conservation of energy that the user owes. We named this scheme "HDRIVE(R)"
 After it had applied for the patent, the number of the total service exceeded 50. This time, we would like to introduces the detail of HDRIVE.


Operational Experience of the Recycle Boiler

Sadayuki Kawamura
Hachinohe Mill, Mitsubishi Paper Mills Limited

 The promotion of countermeasures for global environmental issues is one of the most important management strategies of Mitsubishi Paper Mills, Ltd. The Mitsubishi Paper Mills Environmental Charter lists "Reducing overall CO2 emissions" as the first item of it's action plan. Before the end of fiscal 2005, our target is to reduce CO2 emissions by 20% of 1999 levels.
 To meet this target we installed a waste boiler at the Hachinohe mill in July 2004. Instead of burning fossil fuel, we used waste tires, waste wood and paper sludge. The operation of this waste boiler significantly reduced CO2 emissions and energy consumption.


Energy Saving on Cold-water Equipment of Chlorine Dioxide Generation System (R8)

Hirobumi Hamamoto
Ebetsu Mill, Oji Specialty Paper Co., Ltd.

 As the environmental issues on dioxin have drawn bigger attention recently in pulp & paper industry, we have been required to adopt the new bleaching method (ECF, TCF etc) which don't use chlorine.
 At Ebetsu mill of OJI SPECIALTY PAPER, we converted the bleaching method into ECF in 2003. Simultaneously, chlorine dioxide generation system was also renewed, altering main bleaching chemical from chlorine to chlorine dioxide.
 In the process of generating chlorine dioxide, gas is generated first, then transformed into liquid by being absorbed in cold water.
 As the conventional steam ejector cooling system requires much energy to cool down the water, we have changed to "CHILLER and Thermo-siphon system", the cold-medium and compressor system, making energy consumption less than before.


Energy Saving at the Power Plant

Yoshiyuki Nagao
Mishima Mill, Daio Paper Corporation

 The power plant at Mishima Mill consists of 18 boilers and 14 turbines with a total rated output of 531 MW. It supplies all electricity used at the mill and the surplus is sold to the market.
 After the 1970s oil crisis, Daio Paper converted from heavy oil to coal. Since 1985 we have also made the power plant more efficient by installing more boilers and turbines that create higher steam temperatures and operate at higher pressures. In addition, we have increased utilization of recycled pulp, which has a low energy consumption rate. As a result, we accomplished a 12% reduction in fossil fuel energy consumption, as measured tonnage of paper produced, in 2004 compared with that of 1990.
 In a situation where we are striving to help prevent global warming, we set a voluntary target of a 20% reduction in carbon dioxide emission per tonnage by 2010 compared with that of 1990. We are making further efforts in the area of energy saving and conversion of fuel to achieve that target and reduce our energy costs.
 Details of energy saving procedures at Mishima Mill are discussed in the following section.


Technical Trend of Mechanical Seals for Pulp & Paper Plants
- The Cartridge Outside Mounted Mechanical Seal -

Hidekazu Takahashi
EAGLE INDUSTRY Co., Ltd., Customer Service Dept.

 A mechanical seal prevents or reduces outboard leakage of toxic chemicals and saves energy and resources. Therefore, it can be deemed as one of the important environmental instruments that is directly and indirectly contributing environmental preservation. In a pulp & paper plant, many numbers of varieties of pumps are utilized such as water pumps, pulp pumps and chemical pumps all through the production processes from digesting to painting. In recent years, a mechanical seal has been selected as a standard sealing device for such pumps. Accordingly, ease of maintenance and foolproof design are getting of the essence. Anther interest is interchangeability that cuts down spare needs. A new outside mounted cartridge seal having such features is presented.


Efficient Mixing of Papermaking Chemicals with TrumpJet™ System
- Without Any Fresh Water -

Jouni Matula
Wetend Technologies Ltd.
Akira Ejima
Matsubo Corporation

 A new innovation, developed TrumpJet™ Technology is used to inject papermaking chemicals efficiently into headbox stock. The mixing is greatly improved and consumption of chemical is reduced. The injection liquid is circulated headbox stock or white water instead of fresh water. Several installations operate with good results and improved quality of production.


Energy Saving for Refiner
― The Latest Refining Technology for Saving Energy ―

Kazuo Aoshima
Aikawa iron Works Co., Ltd.

 The saving energy is a worldwide request and one of the most important subjects in Pulp & Paper industry. This paper reports how to improve energy saving for the existing refiner and the latest development for refiner, which is called as "ADC" Aikawa Double ConiFiner.


Operational Results of Neutral Deinking for Old Newsprint and Potential Application in Asia-Pacific Recycle Mills

Jim Merza, R. Daniel Haynes
Eka Chemicals Inc., USA
Johan Allen and Christine Chezick
Bowater Canadian Forest Products Inc.
Jamie McMullen
Tembec Paper Group, Pine Falls Operations
Myra Fong
Tembec - Spruce Falls Operations
Kozo Ibara and Yoshikazu Sonehara
Eka Chemicals K.K.

 Earlier work has shown the success of a 10 day sulphite based neutral deinking trial. The neutral deinking process has now been successfully introduced into several recycle mills. Evaluation of free ink content and Lab scale studies showing the potential of this technology for the Asia-Pacific Region.
 The objective of this paper is to document similarity and changes in plant operations by a survey of the recycle plant process and comparison of mill data before and after conversion. The mill survey includes information on pH, brightness, ink impairing brightness measured by ERIC, ink removal efficiency, water brightness of grey water, ash content, and solids loss at flotation. In addition, a review of each mill's operational changes in ERIC and ISO Brightness values is made after about 1 year of neutral deinking.
 The results found all three mills able to match or to have a similar ERIC value after flotation despite a higher ink fragmentation going into flotation. Two of the three mills were able to reach or exceed their target brightness based on average mill data. The third mill averaged within one point of the target brightness and had a lower final ERIC value. Based on these three mills it can be concluded that sulphite based neutral pulper chemistry is able to operate continuously under the varied mill operating conditions typically experienced in the industry.


New Concept, High Efficiency Turbo Blower

Hiroyuki Hosoya and Naoki Tani
ITOCHU SANKI CORPORATION

 Korean company, Kturbo Inc, has developed high efficiency Turbo Blower (TB) series. TB series are the perfect turbo blowers with semi-permanent foil air bearings, high speed motor. They can save more than 30% of energy consumption compared with roots blowers. TB series are oil-free and noise-free turbo blowers which are directly driven by permanent magnet high speed motors supported by hydrodynamic air foil bearings. Direct drive of the rotating shaft without mechanical contact reduces the noise level up to 85dB@1m, and total product weight and volume by 1/3 and eliminates the construction of basement for vibration isolation.
 Kturbo blowers can be used for waste water treatment, conveying system of cement factory, process air supply for paper and fiber factories, etc. In particular, they are the best solution for food/beverage and cement factories which need perfectly clean air.


Treatment of Waste Water from a Paper Manufactory by Magnetic Separation
-Production of Reused Water-

Koushi Fukunishi, Hiroshi Ida and Yoshiyuki Kakihara
MS Engineerings (Futaba Shouji Co., Ohsaka Chemical Izuo Labo.)

 Purification of waste water from a paper factory was attempted by super-conductive high gradient magnetic separation (HGMS) in a pilot-plant scale of 2000 ton a day. The plant of 2000 ton/day drainage consists of three main tanks, ie., a reaction tank, a separation tank (thickener), and a magnetic-separation tank. In the reaction tank suspended and resolved substances in waste water were magnetized with magnetite particles and aluminum sulfate as coagulant (magnetic seeding). The resulting heavy magnetic flock precipitated smoothly in the separation tank and the remained magnetic flocks were captured by magnetic filters in the magnetic-separation tank.
 The original COD (Mn) values (chemical oxygen demand) of waste water from a paper mill were in the range of 60〜200 mg/L. The COD values reduced to 30〜60mg/L by the sedimentation process and by the following magnetic-separation process. Their transparency was also raised prominently (turbidity=5〜10 NTU).
 In the magnetic-separation part, a super-conductive magnet of 3 Tesla was set, and a filter container with 400mm-bore in diameter was filled with magnetic filters. Floating magnetic flocks were trapped at the magnetic filters in high efficiency of more than 98%. An exchange and a washing system of the mud filters were developed by building up a continuous push out system. A production test of 2000 ton a day gave reasonable results with a continuous automatic operation.


A Report on International Symposium on Wood Science and Technologies 2005

Takayuki Okayama
Tokyo University of Agriculture and Technology
Shigenori Kuga
The University of Tokyo

 International Symposium on Wood Science and Technologies (IAWPS2005) was held in Yokohama on November 27-30, 2005 under co-organization of The Japan Wood Research Society (JWRS) and The International Association of Wood Products Societies (IAWPS). Total participants were more than 500 including 149 from outside of Japan. 395 papers including 4 plenary lectures, 163 oral presentations and 228 poster presentations were presented at 10 sessions. 33 papers including 12 oral presentations dealt with pulp and paper science and technology.


Study on the Water Retention of Coating Color by Sandas Method (Pressurized Filtration) Suggests that Using a Filter of 0.4m Pore Size is More Reliable to Predict Performance of Color in Coating Operation and Resultant Product Quality

Yuichi Shiba
Corporate Research Center, Mitsubishi Paper Mills Limited

 AA-GWR water retention meter is a very popular and useful test method for water reduction of pigment slurries. It is based on pressure filtration of coating colors under an air pressure and suitable for estimating a penetration phenomenon of a water phase from a coating color into a base paper under a practical coating process. In this study various plastic filters with specific pore sizes (5.0 to 0.05 m) were used for filtration of colors on AA-GWR. The dewatering amount of the colors was compared to the runnability of the color on a pilot blade coater. Some factors such as finer pigments and nonionic materials made an amount of filtrated materials increase much. And the reasonable correlativity between the runnability of coater and the dewatering amount was spoiled. The unreasonable water retention values on 5.0 m pore size filter were found on the evaluation of specific coating colors which contained nonionic water soluble binders such as Polyvinylalcohol (PVA) and Hydroxyethyl starch (HES) and finer pigments of TiO2 and CaCO3. These materials were not trapped by the filter and reached the test paper. However it was found that the 0.4m pore size filter was possible to be used to measure reasonable penetration of water phase of such colors and to estimate the runnability on a coater. Additionally water retention values measured by 5.0 and 0.4 m for common coating colors were almost the same.

Keywords: AA-GWR, water retention, coating color, blade coater, filtration