|2010 January JAPAN TAPPI JOURNAL
Vol.64, No.1 Abstracts
The Summary of Cl & K Removal System Using Ion Exchange Resin
- Give an Outline of Chloride Ion & Potassium Ion Removal System from Electrical Precipitator Ash Solution-
Specialty Plant & Materials Division, Nippon Rensui Co.
In the Kraft Pulp Production Process, the plugging problem of carryover particles and dust at the Recovery Boiler is one of particular issue for Cooking Chemical Recovery Process in many years. This problem is known it caused by decreasing melting temperature of dust along with increasing concentration of Chloride (Cl) and Potassium (K) in the Black Liquor because of Cl, and K entering with raw-material wood chip are gradually accumulated and concentrated during continuous operation. This manuscript provides outline of constituent of gCl & K Removal System using Ion Exchange Resinh which was developed by Nippon Rensui Co. cooperated with Hokuetsu Paper Mills, Ltd., and installed at Niigata Mill as the first commercial plant, also installed at Nippon Paper Industries Co., Ltd. Iwakuni Mill, Oji Paper Co., Ltd. Tomioka Mill, and awarded gSASAKI PRIZE in 2009h.
ADC Double Conifiner
-The Performance & Benefits-
Technical Sales Department, AIKAWA IRON WORKS CO., LTD.
Continuous Recycling of used paper is changing the target of Refining not only gLowering Freenessh but gKeeping Freeness but better paper strengthh. Further issue is power saving. In almost all cases, this power reduction could be achieved by optimizing the installed equipments.
In this situation, we released gADC Double Conifinerh in 2002 for energy saving at refining process. Since then, we have been receiving good reputation from our customers and our ADC Double Conifiner is running in lots paper mills achieving energy saving and increase in paper strength at stock preparation process. This paper would report the actual operation and achieved merit in some paper mills with our pilot plant trial results.
Possibilities of Bio Information Technology to Tree Plantation
Forestry Research Institute, Research & Development Division, Oji Paper Co., Ltd.
Since 1991, Oji Paper has been advancing the overseas forest plantation business for securing the forest resource and protecting the environment. Generally, one of the main difficulties in the breeding of plantation trees is that tree breeding requires long time. Now, we are challenging to speed up the plantation tree breeding program by new biotechnology.
A biomarker is an indicator of a biologic state of animal and plants. So, we are creating biomarkers to diagnose genetic potential, nutrient, and stress conditions of plantation trees. These biomarkers enable us to predict growth potential and wood quality in the future by measuring biomarkers at the seedling stage. We report our current status of the project.
Operational Experience of New Chip Feed System
Sendai Mill, Chuetsu Pulp and Paper Co., Ltd.
The production of the digester at Sendai mill has been increased from 400ADT/D of original production to 750 ADT/D with several upgrades. On the other hand, since the quality of raw materials has been getting worse and worse, it has been getting more difficult to keep the production. In addition, such low quality chips cause the troubles in the chip feeding line. In order not only to solve these problems but also to upgrade the chip feeding line, COMPACT FEEDTM system was adopted. Even it was experienced some unstable operation in the beginning of start up, COMPACT FEEDTM system enables us to solve those problems and to keep stable operation.
Operating Experience of New Kraft Pulping Plant
Mill, Hokuetsu Kishu Paper Co., Ltd.
The N 9 paper machine with 350,000t/year of the capacity has been built and has started for the commercial production from September 2008 in The Niigata Mill of Hokuetsu Kishu Paper Co., Ltd. With the plan to install the N 9 paper machine it was investigated that the production of LBKP in the mill has to be increased 500t/day based on the total mill balance.
In order to increase the production rate, the chip handling system and the continuous digester together with installation of a new impregnation vessel were modified, one pressure diffuser was added, and also it was constructed that i) a new fiber line including from the washing plant to the bleaching plant, ii) a recausticizing and kiln plant, iii) a oxygen gas generator (PSA), iv) a new evaporator, etc.. All modifications and constructions were finished in May 2008.
In this paper, it will introduce that the main equipments in the continuous digester, the fiberline, the recausticizing and the kiln as well as how the operation of these systems since start up.
Effective Peroxide Bleaching of Deinked Pulp Adding Catalase Inhibitor
Yufutsu Mill, Nippon Paper Industries Co., Ltd.
Technical and Engineering Div., Nippon Daishowa Paperboard Co., Ltd.
Catalase is a common enzyme found in nearly all living organisms which are exposed to oxygen, where it functions to catalyze the decomposition of hydrogen peroxide to water and oxygen. As is generally known, multiplications of aerobic bacteria may lead to increase of catalaze at pulp plant. Large existences of catalase inhibit pulp from bleaching efficiency, and excessive charges of peroxide will required to achieve the expected brightness, which will increase the cost of production. Sterilization of bacteria by the fungicide, inactivation by heat treatment or application of chelating agent, they can inhibit the activity of the catalase. This paper describes results on catalase inhibitor which performed effective peroxide bleaching at HDIP plant In Ishinomaki mill.
Operating Experience in Cross-direction Moisture Profile Control System for Corrugating Medium on PM7
Yashio Mill, Rengo Co., Ltd.
PM7 of Yashio Mill, Rengo Co., Ltd. produces corrugating medium ranging from 115 to 160gsm. Since the commission of the machine in 1991, over 1000tpd of corrugating medium is distributed Japan-wide. In order to meet paper quality requirement and to improve the machine speed with the increased demands of lower basis weight paper, cross-direction moisture profile control system was installed.
Control actuator selection was based on the compact design for the purpose of saving space. Also, cross-direction moisture profile control system supplied by YOKOGAWA Electric Corporation was installed after duly considering effective profile control at dryer rear part. This system by YOKOGAWA is the first to be used in the Japanese paperboard industry.
Outline of the facilities, operational experience and installation achievements will be introduced below.
Operating Experience of Single Nip Shoe Press
Kasugai Mill, Oji Paper Co., Ltd.
Oji Kasugai PM4 produces many kinds and grades of paper such as uncoated woodfree paper (joushitsu-shi, chushitsu-shi), base paper for A2, A3 and LWC grade. In recent years, we have increased our production of low-density paper in step with the growth market. In order to produce low-density paper on PM4 with tri-nip press, it was needed to reduce nip pressure and to add lots of chemicals which make paper density lower. It caused decreasing of dryness at press section, rising cost by using chemicals, additional loss time for grade change, and increasing consumption of pulp and energy. As a countermeasure for these problems, we have developed new press type in which we could produce not only smooth wood free paper but also low-density paper with effective dewatering and without such chemicals. And finally we installed esingle nip shoe press and belt-smootherf in January 2008.
This paper will present the outline of esingle nip shoe press and belt smootherf especially about the process of development and selection of fabrics for this press type, challenges in operation and solutions for them. And some results of this project will be shown.
Measurement and Analysis of Wet-end Section
Tomohisa Gondo and Manabu Yamamoto
Research & Development Div., Pulp and Paper Research Laboratory, Oji Paper Co., Ltd.
In recent years, papermaking conditions have been changed by the use of various recycled paper, high amount of coated broke usage and closed water system in paper mills. These situations cause wet-end problems such as deposition troubles and deteriorating first-pass retention and drainage, which lead to deterioration in runability and productivity. Therefore, papermakers require accurate solutions for wet-end problems urgently, but these situations complicate them.
In this paper, we suggest a process to solve wet-end problems, and show difficulty of their data analysis.
Operation Experience of Biomass Boiler
Iwakuni Mill, Nippon Paper Industries Co., Ltd.
Nippon Paper Industries Iwakuni Mill is rich in water from the Nishiki River and is in a coastal industrial region. Making use of this good location, we have mainly produced coated paper and information paper. And, we introduced 5KP, No.8 Recovery boiler and No.9 machine, and we started operating a biomass boiler, aiming at the post-heavy oil and a decrease of carbon dioxide emission. I will make a report about the experience of building, commissioning and operating a biomass boiler until now, and about a summary of the equipment and an early trouble with operating.