2014 June JAPAN TAPPI JOURNAL
[プリント用ページ]
Vol.68, No.6 Abstracts


Energy Saving by Flue Gas / Water-Heat Exchanger on New Waste Fuel Boiler

Hiroaki Hamada
Hokkaido Mill-Shiraoi, Nippon Paper Industries Co., Ltd.

  While there is an urgent need to act Global Warming Mitigation Measurements, Nippon Paper Group was formulated "Green Action Plan 2015". In this plan, we formulated two amount agendas:
  a)  Reduce CO2 emissions from fossil energy CO2 by 25% versus fiscal 1990.
  b)  Reduce the use of fossil energy by 30% versus fiscal 1990.
  In Hokkaido Mill-Shiraoi,  we've been taking various energy-saving measures. In May 2013, we installed flue gas / water-heat exchanger (GWH)  on the gas exhaust line of #1 new waste fuel boiler . This GWH is sulfuric acid dew point resistance type, and produced by Air Fröhlich Engineering AG, Switzerland. This system reduced steam consumption in deaerator by improving exhaust heat recovery, and the installation made us achieve energy conservation.  In this report, we will introduce the case of energy conservation by installing this GWH.


Energy Saving by Pinch Technology

Yosuke Kado
Chiyoda Corporation

Pinch Technology is an analytical methodology to utilize heat efficiently which enables to identify energy saving potential in plants based on their both heat demand and power demand. Many plants in heavy chemical industries such as refineries and petrochemicals have adopted this methodology to analyze and confirm their energy saving targets and successfully led to reduction in their energy consumption.
  Pulp and paper industries consume a large amount of energy. Energy saving has been studied for long years and great deal of equipment has also been introduced to improve energy efficiency. However its study approach is not based on thermodynamics.
  Since Pinch Technology is completely based on thermodynamic principles, it can be applied to not only heavy chemical industries but also pulp and paper industries to further improve their energy efficiency.


The Air Saving Measure of Paper Machine at Tomakomai-Mill

Satoshi Nakatani, Kazuo Musa, Yukio Urabe, Masaaki Akitaya, Jin Onodera, Takahito Suzuki, Jun Kabasawa and Hidenori Saito
Tomakomai-mill, Oji Paper Co., Ltd.

  The cost reduction  measure is one of the main daily business for those who are engaged in the manufacturing industry. The environment surrounds us is very severe because of the reduction of the domestic paper demand by progress of Information Communication Technology, and the increase of the imported paper. We have to do bolder cost reduction which ever we have done before.
  Under these circumstances, we tackled the save of air consumption in paper making section at Tomakomai- mill, finally, we could stop one air compressor regularly.
  This news reports these contents of a measure.


Low NOx Burner for Coal Fired Steam Generator

Iwamaro Amano and Shigeharu kokuryo
Boiler Engineering Department, Mitsubishi Hitachi Power Systems, LTD.
Keigo Matsumoto
Nagasaki R&D, Mitsubishi Heavy Industries, LTD.

  We were analyzed by CFD the generation mechanism of NOx and unburned carbon in fly ash of conventional low NOx burner. We thought the four concepts of development of new burner from CFD analysis results. The four concepts of development are as below.
  (1)   A large, uniform ignition area is created over the entire surface of the burner nozzle to achieve better ignition performance than a conventional low NOx burner.
  (2)  According to the coal combustion characteristics, the optimum amount of secondary air is supplied at the optimized timing in order to optimize the oxygen concentration in outer flame.
  (3)  As result of (2), the high temperature and high oxygen level area in the outer flame, which causes the formation of NOx, is diminished.
  (4)  By maintaining the reducing atmosphere in the inner flame, NOx is effectively reduced by the existing reducing substances in the inner flame (volatile matter and char) and simultaneously, the combustion of unburned carbon is facilitated.
  We developed new burner (M-PM burner) in accordance with above concepts with the combustion test in the test furnace. From the results of the combustion test in the test furnace, we are able to reduce significantly NOx emission and unburned carbon in fly ash using new burner compared with conventional low NOx burner. We also got the results that NOx emission or unburned carbon in fly ash is possible to reduce about from 25 to 30% respectively compared with the conventional low NOx burner in the field combustion test for industrial steam generator. In this paper we described the concepts of new low NOx burner, the test results in the test furnace, combustion test results of the industrial steam generator and applicable way to energy-saving operation of the steam generator.


Energy Saving by Modification of Medium Pressure Steam Lines at Power Plant

Hitoshi Nakamura
Soka Mill, Nippon Paper Industries Co., Ltd.

  Nowadays, it is urgently necessary to improve profitability as fuel price increases and efforts of energy saving are regarded as important. Due to Japanese economic condition in the past few years, we were not able to invest and renew large-scale equipment. However, we found a new energy saving efficiency to build Medium Pressure Steam Lines that our plant has not owned. The following is the report of construction outline and operating experience.


Energy Saving Case by Facilities Improvement in the Takaoka Mill

Masatoshi Sekii
Takaoka Mill, Chuetsu Pulp & Paper Co., Ltd.

  The Takaoka mill has home electricity generation facilities such as recovery boiler power plants, wood-fuel boiler, and fluidized bed boiler, accordingly total mill energy balance is constituted by these facilities. For the purpose of energy resource saving and cost reduction, we keep going to reduce fossil-fuel consumption and CO2 emission, then to use more biomass energy, waste paper, and wood resources, while trying to adopt next generation new technology. In this paper, I introduce the case of old power plant facility improvement for trying to recover its original capacity.


Energy Saving Effect by Steel Yankee Dryer
― Manufacturer: Hergen Paper Machinery ―

Makoto Matsushita
KGK Engineering Corp.
Takefumi Ide
TAIZEN CO., LTD.

  Aiming to develop an alternative to conventional cast iron Yankee dryers and based on the evident technical benefits such as reduction of investment and operational costs, Hergen Paper Machinery offers to the Tissue & Toilet Paper producers the most advanced line of Steel Yankee Dryers. We would like to introduce the detailed feature and the energy saving effect achieved by the Steel Yankee Dryer manufactured by Hergen, which has already been proven by the end users.


The History of Paper Machine Development: 100 Years from Robert's Invention
Part 2: The Development of Fourdrinier Machine

Kiyoaki Iida

  Paper machine, which was invented by Donkin, became complete from head box to reel with further improvements in its design. Then, it grew bigger and ran faster, and in around 1900 it was 160 inches wide and was operated at the speed of 600 feet /min. The history of improvements and those who made them were reviewed in the part 2.
  There existed a favorable spiral acceleration of technological development. Once infrastructure of technology was prepared, it stimulated new technologies, which in turn increased the level of the infrastructure.
  For instance, a bigger and faster machine needed higher power drive, which was supplied by water wheel at that time. To satisfy the need, water turbine was invented. To invent water turbine, high level of metal work was necessary, and it was accomplished by development in machine tools in the precedent days.
  As paper was manufactured with higher productivity and less cost by technological developments, it helped transferring information in society efficiently and contributed to prepare the higher level of technological infrastructure.


Corporate Profile & Products Information (12)

ICHIKAWA CO.,LTD.

  Founded in 1918, Ichikawa Co., Ltd. has dedicated to develop cutting edge technology to optimize performance for paper production specialized at its press-part section. We acquired ISO9001 in 2003, striving for far better quality than ever. We are a global leading supplier of equipments used in paper manufacturing, press-felt, shoe press belt, and transfer belt, with best tailored solutions for every paper manufacturer around the globe. Forty two percent of our sales comes from overseas market. The products highly satisfy our clients in whatever country with its unrivalled performance as well as the inimitable quality.
  In the following, we are happy to explain a lot more about us, our company profile, product features, production process, and so forth.
  The head quarter is located in Bunkyo Ward, Tokyo, while two production mills are stationed in Kashiwa, Chiba, and Iwama, Ibaraki, both from 30 to 70km away in northeast of Tokyo. Our Research and Development Centre sits in Kasama, Ibaraki.


−Peer Reviewed−
Precise Determination of Lignin in Residue Obtained from Enzymatic Hydrolysis of Phyllostachys Pubescens Stem Alkaline Sulfite Pulp

Yi Zhang Akiko Nakagawa-izumi and Hiroshi Ohi
Graduate School of Life and Environmental Sciences, University of Tsukuba

  Previous research has shown that bamboo stem alkaline sulfite pulp is enzymatically hydrolyzed with a much greater enzymatic saccharification ratio than larch pulp and cellulose filter paper. In order to investigate the residual lignin and saccharification behavior of pulp during enzymatic hydrolysis, it is necessary to precisely determine the lignin content of the pulp after enzymatic hydrolysis. To investigate the behavior during enzymatic hydrolysis and the residual lignin of these pulps, methods that can precisely determine the lignin content after enzymatic hydrolysis were considered. One of the widely used methods for determining lignin content is the acetyl bromide method, by which it was shown that the xylan in bamboo pulp affected the determination of the residual lignin due to the UV absorption by the reaction products. Furthermore, the amount of water in the reaction system also affected the UV absorbance. The application of the acetyl bromide method to bamboo alkaline pulp is difficult. On the< other hand, using a pyrolysis-gas chromatography/mass spectrometry method, the lignin content of the pulp after enzymatic hydrolysis can be precisely estimated.
  It was shown that bamboo alkaline sulfite and soda pulps produced much more glucose than cellulose filter paper during enzymatic hydrolysis, and the residue ratios were found to be low. The determination of the lignin content of the residue after enzymatic hydrolysis showed that the lignin content decreased as the enzymatic hydrolysis of the pulp proceeded. Conversely, the lignin content of the soda pulp during enzymatic hydrolysis was almost constant. It was also suggested that lignin dissolved from bamboo pulp during the enzymatic hydrolysis enhanced the enzymatic saccharification ratio.