2013 June JAPAN TAPPI JOURNAL
 
2013 June JAPAN TAPPI JOURNAL

Vol.67, No.6 Abstracts


The Improvement of Boiler Efficiency on Our Pulverized Coal Fired Boiler
| Introduction of Coal Additive to Control Clinker Generation to the Boiler |

Kazunobu Kawaharagi
Kushiro Mill, Nippon Paper Industries Co., Ltd.

  This paper presents the energy saving effect which was gotten by introducing the Fe-based coal additive to prevent Clinker generation to solve troubles on our pulverized boiler.
  Nippon Paper Industries installed the new pulverized boiler which called N1 boiler and the new steam turbine which called N1 turbine in Kushiro mill in 2004, and has begun electric power wholesale business with accumulated know-how to operate pulverized boilers.
  After into commercial operation, we had been suffered from the following problems on the N1 boiler.
  · Huge clinker growth which is over the furnace wall bottom. And peeling off of it had made unexpected halting the boiler operation due to the bottom ash conveyor trip.
  · Plugging trouble on the heating element of the Ljungstrom type air preheater caused by ash and sticky acid ammonium sulfate (NH4HSO4) which was produced by ammonia leakage from the NOx removal reactor combined with SOx. And also the acid ammonium sulfate sticks discharge electrodes and collecting electrodes in the electrostatic precipitator that have possibility of making the precipitator trips due to short-circuit.
  And we have thought that above problems has made reducing the boiler efficiency due to the insufficient heat exchange in the air preheater and the short supply of the combustion air. So, to solve the problems, we have started inject Fe-based coal additive with Clinker generation prevention effect. As a result, we achieved an enough problem solving and energy saving.


Heat Exchange Paint  NeOCOAT

Yoshiyuki Fujioka
EcoloTec Corporation

  NeOCOAT is a next generation eco-paint which consumes heat by converting thermal energy to kinetic energy using eheat-exchange molecules’ in paint. NeOCOAT can be applied to a wide range of surfaces including roofs, pathways, sports grounds, parking areas, indoor surfaces, and play equipment.
  In addition, it is effective in reducing air-conditioning costs and controlling condensation.


Energy Conservation Examples of Initiatives Manufacturing Department Futatsuka

Tatsurou Okada
Takaoka Mill-Futatsuka, Chuetsu Pulp & Paper Co. Ltd.

  In recent years, oil prices have been rising. Furthermore, after the Tohoku Earthquake (2011) , energy-saving is important challenge for not only at a company but at the home. A company must make an effort more by shortage of electric power supply.
Also, in the Manufactuaring department Futatsuka, the energy-saving committee was established in 1990, and we have been implementing energy saving activities every day.
And now, a large-scale investment is reduced and it is not expected improvements in equipment replacement. We are going to build up small results to achieve the target in the difficult situation.
  This report introduces the contents of a measure and the examples in energy-saving activities.


Energy Saving Method by JBIC

Yasuhiko Shirota
JBIC:Japan Business Innovation Consulting Co., Ltd.

  The important point of energy saving activities is constituted with the seven contents and explained that know-how.
  1)  Understanding how to catch energy losses.
  2)  To grasp the injection actual condition of energy. (Check the facts).
  3)  Consider the results of the analysis, and find losses item.
  4)  Create a theme in the management by objective according to phase, and the group way of thinking.
  5)  Examine a concrete method and clarify the formation evidence.
  6)  Makes a determination of compatibility organizationally.
  7)  Draw up an execution plan and establish the next activity.


Energy Saving by Stopping the Production Equipment Industrial Water in the Daytime

Youichi Usukubo
Osaka Mill, Hokuetsu Kishu Paper Co., Ltd.

  The nuclear power plant disaster after the Tohoku Earthquake in 2011 had especially caused concern about power shortage in summer, and power saving & measures against power shortage had taken not only at factories but at home.
Among others, Kansai region (area) has highly relied on nuclear power generation and also any nuclear power plants in this area didn't operate in first half of 2012. Therefore, power shortage had been increasing serious problem.
Under the circumstances, as measures for energy saving, we're introducing our cases such as resuming operations of gas cogeneration facilities which had been halted in response to the power company’s request, and energy saving activities at the industrial water facilities which showed the effect through steady efforts of small group movement.


The Optimal Operation and Business Improvement by BTG Management System -FEMS-

Tomohiro Umino and Keiji Aoki
Energy Systems Center, Mitsubishi Electric Corporation

  Interest in FEMS (Factory Energy Management System) which performs energy optimization of the whole factory is increasing because of issue of global environment and electric power shortage. FEMS makes it possible to reduce energy and satisfy the demand of a factory. The past results show about 0.5`1% of fuel cost and greenhouse gas can be reduced by FEMS. The effect by FEMS is not only an economic aspect. It can be said that greenhouse gas was reduced, because the fuel to burn is reduced.
  We developed FEMS in 2003. After that, we have suggested and supplied FEMS to many customers. We have continued development based on a customer's demand and improvement. As a result, FEMS became high-precision control and a system which has an attractive support function. This paper introduces the concept and System configuration of FEMS, the function of On-line FEMS and Off-line FEMS. After that, it explains some features of our specific technologies which are calculation method of cost merit and multi-objective particle swarm optimization method. Multi-objective particle swarm optimization method makes it possible to become cost optimization and Greenhouse gas minimization simultaneously.


Activities for Energy Saving in Yonago Mill

Koji Ishitoya
Yonago Mill, Oji Paper Co., Ltd.

  At our YONAGO mill, all members are working on the target "1.5% reduction of the total energy of our mill".
  However, it is becoming more and more difficult year by year to find new or drastic energy-saving matters.
  In spite of this difficult situation, by focusing on several projects, we have been successful in reducing the energy consumption of our mill continuously.
  This paper reports how we can achieve our target, and our energy-saving cases.


Corporate Profile & Product Information (2)
ARAKAWA CHEMICAL INDUSTRIES, LTD.

  Arakawa Chemical was established as a natural medicine manufacture and wholesaler in 1876 in Osaka. For over 130 years, we have made continued efforts to take advantage of the most flexible thinking and state-of-the-art technology available at the time, to offer our customers the rosin-based chemical products commonly called pine chemicals.
  Arakawa Chemical Industries, LTD. manufactures various paper chemicals including water-repellents, sizing agents that prevent printed matter from blurring and feathering, paper strengthening agents to increase the strength of paper and corrugated cardboard, and fortifying the water resistance of tissue or paper towels, and these chemicals in turn may facilitate the advancement or appearance of new papermaking technologies. Our company has the largest sales of paper chemicals in Japan, and it is steadily expanding into the Asian market especially China.


Basic Lecture of Paper Board (2)
Used Paper Recycling in the Pulping Process

Akihiro Yamamori and Taku Uchiumi
Oji Materia Co. , Ltd.

  Used paper has been the main raw material for papermaking. In particular, the percentage of used paper accounts for more than 63% in Japan. Among a variety of used paper, by establishing the used paper processing technology in accordance with the application, we have attempted to increase in used paper utilization.
  Used paper recycling in Japan has a long history as it can be found it in the recording of the Heian era. As raw material for paper, used paper came to be used in earnest, it is 1950’s that began to blend the recycled newsprint into paperboard. Then we came to blend the used paper into newsprint paper and low grade printing paper from 1970’s. In Japan, for the following reasons, it began to use large amount of the used paper. a) Preparing for the depletion of the wood resources in the future, b) Energy consumption for pulp production process and the cost of the raw material is lower than fresh pulp. Moreover, with the development of the ink removal techniques from used pulp, the amount of the used paper has grown rapidly. This time, we outlines how to process the used paper into pulp through pulping process and stock preparation process. I


Cellulose Nanofibers Prepared from Wood Pulps, Their Characteristics and Potential Applications

Akira Isogai
Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences,
The University of Tokyo

  Fundamental characteristics and potential applications of cellulose nanofibers prepared from wood bleached chemical pulps by TEMPO-mediated oxidation are reviewed based on the results obtained in our laboratory up to now and during collaboration studies with companies and university laboratories. Significant amounts of C6-sodium carboxylate groups can be formed selectively on crystalline cellulose microfibril surfaces in wood pulps by TEMPO-mediated oxidation in water at pH 10 within 2 h. The TEMPO-oxidized pulps with sufficient amounts of carboxyl groups are then convertible to highly crystalline nanofibers uniform 3-4 nm in width and > 1 µm in length, which are individually dispersed in water, by mild mechanical disintegration. Electrostatic repulsion and/or osmotic effect works well between anionically charged TEMPO-oxidized cellulose microfibrils (TOCNs) in water, thus resulting in the complete and efficient individualization of wood cellulose microfibrils. Transparent and flexible films with high strength, low oxygen permeability and low coefficient of thermal expansion are obtained by casting the TOCN/water dispersions on a plate. The TOCNs are expected to be used as new environmentally-compatible and bio-based nanofibers in the fields of high-performance packaging components and other high-tech devices.