Results of the Fy2006 follow-up
to JPA's Voluntary Action Plan and Report of Energy Situation in the
Pulp and Paper Industry in Japan
Osamu Inada
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
Fy2010, reduce fossil energy consumption per product unit for paper
products by
13% from that
of Fy1990 level, CO2 emission per product unit for paper
products by 10%.  By
2010, the in-and-outside country afforestation area
owned or managed expand to 600,000 ha.
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 Fy1990. The following are the results for Fy2005
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, and information
related Laws.
Introduction of Save Energy type Cl&K Removal System
- Consideration of Chloride Ion & Potassium Ion
Removal System for Solution of Electrical Precipitator
Ash from the Point View of Save Energy -
Tsunenori Okamura
Specialty Plant & Materials Division, Nippon Rensui Co.
In the process of Kraft Chemical Recovery Cycle, Chloride (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. This manuscript provides actual result from Cl&K
Removal System which are developed and installed at Niigata Mill,
Hokuetsu Paper Mills, Ltd. together with the theory of removal
system using ion exchange resin which are characterized of this
system and advantages from the point view of save energy.
Energy Saving with LP-Screen
Atsushi Nishida
Matsumoto Mill, Oji Paperboard Co., Ltd.
In the stock preparation system to produce the secondary pulp by
recycling of the waste paper, each process of the pulper, screen
and refiner consumes significant energy.
So, how to positively promote the energy saving issues will become
key point to extensively reduce the production cost in such heavy
energy consumption type of pulp and paper industry.
In this paper, some examples of energy saving are introduced which
were achieved by rebuilding the conventional PS Screens into LP
Screens, utilizing the low power and low intensity of LP Screen
technology which was developed by Voith IHI Paper Technology (VIPT).
Steam Stabilization and Energy Conservation for a
Coal Boiler by Using a Model-Driven PID Controller
Michihiro Fujiyama
Yatsushiro Mill, Nippon Paper Industries Co., Ltd.
Hiroshi Egi and Takashi Shigemasa
Toshiba Mitsubishi-Electric Industrial Systems Corporation
Fumio Kojima
Toshiba IT & Control Systems Corporation
The movements of energy conservation in Japan are promoting based
on the Kyoto Protocol concerning the reduction of greenhouse gases
at COP3 held in Kyoto in 1997. According to the energy conservation,
the industrial world is making various efforts for the conservation
of energy. The amount of use of cheap coal for boilers of factories
is increasing especially in spite of recent rising of the energy
cost.
Comparing to gas boilers and oil boilers, coal boilers have long
dead time from the boiler master command to main steam pressure
due to long fuel transportation time and long fuel burning time.
Due to the long dead time, the large control gain is not able to
set, as a result the main steam pressure and the main steam temperature
are fluctuating in the large band
If the fluctuation bands could be reduced, and if there is some
margin at temperature limit, the boiler efficiency can be improved
by setting higher value of the set point of the main steam temperature
control loop.
We have already obtained some excellent results by applying the
model drive PID control (MD-PID) for long dead time processes.
In this paper, after showing the Yatsushiro plant, coal boiler
issues and properties of the MD-PID control system, we show the
result for a coal boiler of 440t/hr level of the main steam flow
rate.
Energy Saving in the OCC Pulping Process
Kenya Horikawa
Yashio Mill, Rengo Co., Ltd.
Recently, increasing the social demands on environmental
conservation, Rengo has established Eco Challenge 009, the document
setting forth
our environmental vision and is implementing resource and energy
savings. Regarding the energy saving, we target reduction of 12%
of CO2 emission from the 1990 level until 2009.
As part of our efforts, Yashio Mill has focused on
energy saving in pulping system of old corrugated container ("OCC"),
the main
material at the mill, and we would like to introduce the way and
result of energy saving as a case.
The Activity of "Energy Saving Team"
Akira Takahashi
Nippon Paper Unitec Co., Ltd.
"Energy Saving Team"@belongs to Technology Research
Section of Nippon Paper@Unitec Co., Ltd. and works to help creating
energy
saving plan for all 12 mills of Nippon Paper Industries Co., Ltd.
The Team started at December 2004 by one person for Power and Environment
division and the other person for Pulp and Paper production division.
We visited all 12 mills and had discussion about our
ideas for energy saving every-year. On the discussion, we proposed
around
30 ideas for each mill last year and the result of our proposal
contributed around 8 of total energy saving cost.
Fiber Properties - Paper Quality
- Multidimensional Fiber Characterization -
Bertil Olsson
BTG Pulp and Paper Sensors AB
Takuya Maekawa
Spectris Co., Ltd. BTG Division
This paper deals with the methods of characterizing fiber properties
in order to get defined paper properties. The reasons for on-line
real time measurement will be discussed as well as the advantage
of pulp characterizing methods based on single fiber properties
compared with traditional laboratory measurement on a hand sheet.
Discussions of some applications involving on-line fiber analyses.
A completely new on-line measuring system, based on the state-of-the-art
today, will be presented. By combining knowledge from next generation
analyzers and use of new tools for control applications a supervisory
control system for optimization of fiber quality will be presented.
This contributes to an added value from both lower production cost
and more stable quality. Some typical applications set up by using
this new analyzer in combination with adopted control package will
be presented.
Improved Runnability and Drying Capacity through New Technology
Kari Juppi
Metso Paper Inc.
Kouichi Yuuki
Metso Paper Japan Co., Ltd.
Firstly, new efficient runnability components are introduced and
their effect on runnability and paper quality are discussed. Results
from pilot and production machine installations are described.
Secondly, new drying concept is presented. This concept utilizes
impingement air technology in paper or board drying. Impingement
drying is presented as a short view to history in this field. High-speed
paper machines tend to have runnability problems at the beginning
of dryer section. A high draw is often needed which leads to poor
paper quality. A draw decrease can be implemented utilizing efficient
blow boxes. However, when the sheet dry content before cylinder
drying must be increased, a good choice is to dry paper with impingement
drying before cold paper web contacts the hot cylinder surface.
A new solution has been created for meet this challenge. This new
concept utilizes impingement drying right after press section by
increasing web dry content remarkably before the first drying cylinder.
As paper dry content and also paper temperature has been increased,
paper strength is higher and runnability is better than normally.
The New Contactless Level Gauge and Density Meter: Accurate Measurement
by Using a Weak Gamma Source
Hiraku Miyashita
Nanogray Inc.
Gamma-ray ( -ray)
level gauge TH-1000 and -ray
density meter PM-1000 have the latest detecting system which is
the fruit
of our technologies
on industrial measurements with radiation over 10 years. Although
TH-1000 has only a 100MBq (2.7mCi) source which is a one-several
thousandth strength compared with the conventional -ray level
gauge, TH-1000 can apply for 1.5m-span level gauging and 10m-span
level switch. The minimum response time is only 0.5sec which provide
quick process control. PM-1000 has only }0.4`0.7% error @ 2 ,
although PM-1000 also has only 3.66MBq (0.1mCi) source which is
a one-several
thousandth strength compared with the conventional -ray
density meter. PM-1000 can attach easily on a pipe of the existing
line.
PM-1000 can apply density measurement of black liquor, green liquor,
lime mud, calcium carbonate, and white carbon etc.
Bearing Solution for Paper Plant
Kunio Osaki
HI Sales Dept., Schaeffler Japan Co., Ltd.
INA group Company integrated FAG and LUK few years ago. After integration,
Schaeffler Group started and now has been producing selling bearing
and making technical service.
Schaeffler has many experiences of bearing solution for pulp and
paper industries. Schaeffer would like to report about 4-cases
of special bearing solutions for mainly paper mill application.
Performance and Function that are Demanded of Next Generation Inspection System
Terumasa Miyamoto
W.I.S. Grope, IT Solution Division, Omron Corporation
An initial Web Inspection System, if it detects the defect, was the one only
of simple information of it with the buzzer and the lamp, and marking to the
defect location. Afterwards, defect information on the defect position, the size,
and the classification name is added. It became a very usual function there was
a defect recording system that Omron developed in 1988 now, too. Moreover, by
transmitting inspection data to the next process like FCS (Fault Control System)
and WCS (Winder Control System), it got to do the productivity improvement and
the product management of the next process, too. Also, at present, it became
possible by the improvement and the generalization of the PC and the network
technology to handle a large-volume defect image, too. As a result, it is possible
to say that the volume of information of the inspection data became big drastically
and that the existence value, too, became bigger. In this way, Web Inspection
System was placed in the nucleus of the solution to place as of the paper maker.
It introduces about Performance and Function that are demanded of "Next Generation
Inspection System".
Characterization of Coating Color Penetration by Laser Scanning Microscopy
Kenji Hirai
Research and Development Dept., Product Development Research Lab.
Nippon Paper Industries Co., Ltd.
Douglas W. Bousfield
University of Maine
The quality of a coating layer and the efficiency of a coating process, depend
in large part on the penetration of coating color into the base paper. However,
methods to characterize this penetration are limited. This paper proposes a new
technique that combines Confocal Laser Scanning Microscopy (CLSM) and the image
analysis to characterize the coating penetration into the substrate without any
sample destruction and with little sample preparation.
In this paper, two methods to stain samples were tested to achieve the quantitative
analysis of the coating layer thickness variation and the liquid phase penetration
into the base paper. The results were compared to those obtained from cross sections
using Scanning Electron Microscopy (SEM). Coatings applied onto a plastic film
calibrated the measured thickness with this technique and demonstrated the limitations
of the CLSM method in terms of depth resolution.
As a result of the experiments, the method to stain the coated sample with fluorescence
dye gave the coating layer thickness variation that were consistent with those
from SEM, while the liquid phase penetration depth, which was larger than the
coating layer thickness, could be measured when the dye had been added to the
coating color before the application. These results demonstrate a possible method
to characterize the coating layer thickness and the penetration depth of the
liquid phase into the base paper.
Keywords: coating penetration, confocal scanning laser microscopy |
|