2006年3月 紙パ技協誌

[プリント用ページ]
One Duty Support System
- We Find You Safely How -

Hiroshi Nakano
Toshiba Mitsubishi-electric industrial systems Co., Ltd.

 The labor saving and making work a few operators are promoted in a recent process industry system for making to the conserve cost. Doing the work done by two or more operators alone increases so far, and how worker's safety is secured becomes a problem.
 We Built One duty support system equipped with the life sensor jointly developed with AJINOMOTO Co., Inc. as the solution. We introduce one duty support system while appropriating the focus to the development of the life sensor.


Applying Today's PLC to Process Automation Systems

Jun Ueda
Mitsubishi Electric Corporation, Industrial Products Marketing Division,
Industrial Products Engineering Department

 PLCs as a whole are widely used in the process automation industry. The process control industry has experienced a constant change, such as downsizing, reduced costs, and standardization, as the forefront for process control.
 This article addresses the issues of how today's PLCs in its form are applied to process automation systems.


Application of PLC for PA and Future Evolution of PLC-based Process Controller

Masaki Namie
OMRON Corporation Analog Controller Division

 Some users have utilized the PLC for PA since the first half of the 1980s; however, it started to be used broadly in late 1990's.
 At the beginning, the PLC-based process controller was used for only small-scale batch plants. As the introduction records increases, the application of PLC-based process controller has expanded. The duplex controller system accelerated the application expansion and the PLC-based process controller is introduced for continuous operation plants, these days.
 In this writing, I will introduce some concrete application cases of PLC-based process controller for PA, the evolution concept of Omron's PLC "Smart Platform", and the concept of PLC-based process controller "SMARTPROCESS".


The Most Suitable Management and Cost Reduction Measures of Air for Instruments

Susumu Murayama
Oji Paper Co., Ltd., KUSHIRO Mill

 Enlargement of instrumentation machinery of 2000 loops was expected by large-scale construction from 1999. I accomplished consumption up of air for instrumentation with this without building more compressors.
 We had promotion of further cost reduction measure after 2003 and I started a new action toward reduction of compressors. As a result, I realized reduction of annual electricity 2 million kWh, quantity of coolant 77thousand metric ton and got a big energy saving effect.
 This paper shows overviews of this action. At the same time, I introduce valve-positioner developed with SP DEVELOPMENT LABORATORY CO., LTD. toward vibration-proof structure and stability control, which played a big role of reducing air consumption.


About a Maintenance Effect of Instrumentation Equipment by Air Leak Check

Satoshi Muramatsu
Tech Tokai Co., Ltd.

 Pulp & paper mill selected DCS instead of old controller system now, instrumentation equipment also became electronics type.
 However, many pneumatic device still exist, such as a control valve, a field type controller, and an automatic guide.
 This time, we will make a report on "Air leak check of pneumatic instruments" which was performed by Tech Tokai as a part of energy conservation activities for two years since April, 2003, from the view point of effects on preventive maintenance of pneumatic instrumentation apparatus.


Operational Record of Paper Sludge Carbonizing Plant with the Compact PLC Control System

Kinya Kanda
Hokuetsu Paper Mills, Ltd.

 The PLC control system has replaced the DCS or the personal computer DCS in recent years. In this situation the Nagaoka Mill of Hokuetsu Paper Mills, Ltd applied the compact PLC control system to the paper sludge carbonizing plant that had started the test operation since July, 2003.
 This plant was the first one for the maker. We applied the PLC control system to this plant, because we could change the sequence and the control easily.
 It was the first time for us to install the PLC control system. This report shows the process of installation and the engineering. Especially we designed the part of the engineering by our selves from the first time. Therefore we had a lot of trouble with the interface between the ladder sequence and the control loop, the interface between PLC and HMI in comparison with the DCS. This report also shows the above trouble.


Foundation Fieldbus System Construction by a PC Method

Hiroyuki Nonomura
Yufutsu Mill, Nippon Paper Industries Co., Ltd.

 It aimed at "Establishment of the Fieldbus that everyone was able to treat at a low price" last year in July, and it set it up in the new establishment plant of draining the anaerobic equipment by the composition "General-purpose personal computer + Ethernet + Linking Device + Field equipment " without the adoption case at all at that time. It reports on the development in the obtained finding and the future, because it was possible to be in normal operation.


It is Quickly for Investigate the Cause the Trouble by PLC's Monitor

Kouetu Narita
Nippon Daishowa Paperboard Tohoku Co., Ltd.

 In 1992, NDBTohoku introduced the Voith shoepress due to raise dehydration up at press part for the first time in Japan. This press was remodel from import facility, and the control logic had not established. Therefore we constructed the control logic with manufacturer (IHI).
 But, we complained about analyze the factor of sequence delay, because of complicate systems and less operation experience.
 For speed up of the failure factor analysis, we observed this shoepress control logic in 2003, using by PLC observation monitor.


Supervisory Improvement by DCS-PLC Integration

Hidekazu Morimoto
Mishima Mill, Daio Paper Corporation

 We have renewed the DCS and PLCs for our LKP bleaching & washing plant which has been running since 1984.
 Latest models of DCS have the ability to communicate with PLCs of various vendors in high speed owing to protocols adopted.
 We have integrated the DCS with the PLCs aiming not only operational improvement, but plant diagnoses through PLCs internal data access availability.


Introduction of PLC Instrumentation and Application Example

Hiroshi Omura
Ohnest Co., Ltd.

 In the field of process instrumentation and control field, EI integrated functionality and excelled cost per performance furnished "PLC instrumentation system" has been expanding the application field where mid to small DCS traditionally has been serving.
 It is expected that PLC instrumentation system could be deployed rapidly for environmental satellite control such as utility/waste water control and monitoring particularly in pulp and paper factories.
 We have developed the pH control system to overcome non linear process characteristics by adding fuzzy control function as an advanced control to PLC instrumentation system and applying continuous flow pump for the actuator.
 We expect that these technologies could be utilized as key for the environment monitoring/waste water processing system, which are expected to be replaced actively hereafter.


Toward Optimization/High Promotion of Efficiency of Control Valve Maintenance
- Control Valve Maintenance Support System "Valstaff" -

Minoru Fukuda
Marketing Department, Advanced Automation Company, Yamatake Corporation

 Since the operation of control valve has direct influence on a process, control valve maintenance has the very important role same with turn apparatuses such as a pump, a turbine, a compressor. The control valve maintenance is dependent on experience of an expert. Since the expert's age is high, if technical succession is not carried out to the next generation, a possibility that a plant will become unusual will become high. Therefore, the following is needed, additional data for determining the optimal maintenance cycle of control valve, the tool for performing a prompt action when a plant becomes unusual, and the diagnosis system which can detect failure of control valve before the abnormalities of a plant occur.
 In this report, Control Valve Maintenance Support System "Valstaff" developed in our company for optimization and high promotion of efficiency of control valve maintenance is proposed.


Performance Improvement of Consistency Profile Control by the Latest CD Adaptive Control

Hironobu Maruno and Takashi Sasaki
P&W Solution Dept., Industrial Automation Systems Business Division,
Yokogawa Electric Corporation

 In this paper, we introduce the concept of consistency profile control in B/M9000CS. It is composed of mainly the following four parts. 1) Virtual actuator corresponding optimizing control. 2) Model predictive control. 3) Auto tuning tool. 4) CD adaptive control. Especially, CD adaptive control has succeeded to realize world first fully automated identification of mapping. CD adaptive control constantly and automatically executes analysis and adjustment of mapping during profile control.


Water Vapor Transmission Behavior through Porous and Dense Enthalpy Exchange Sheets Treated with CaCl2, LiCl and Colloidal Silica

Bong-Yeol Yeom and Byoung-Ryul Min
Department of chemical engineering, Yonsei University, Seoul, Korea

 This report is concerning the sheet to be utilized to the air-to-air heat exchanger. Observation on the characters of the moisture permeation for two types of the enthalpy sheet (porous and dense enthalpy sheets) has been conducted. To improve the efficiency of the moisture permeation through the enthalpy sheet, the moisture absorbents CaCl2, LiCl and colloidal silica have been used. Throughout the wet cup test according to the ASTM standards, the tests of the moisture permeation according to the changes of the air gap have been conducted. For both of the porous and dense enthalpy sheets, it showed 2 to 2.5 times of increase for the permeability of water vapor when the air gap reduced from 13 mm to 6 mm. Also, according to the treatment of the moisture absorbent, the permeability of water vapor increased, but after the certain amount of the processing no further increase of the permeability was shown. For the dense enthalpy sheet compared with the porous enthalpy sheet, it showed more increase of permeability of water vapor due to the moisture absorbent and also it was seen that the dense enthalpy sheet has the similar permeability of water vapor to the porous enthalpy sheet’s when processing the moisture absorbent.

Keywords: air-to-air heat exchanger, enthalpy sheet, wet cup test, air gap, permeability, moisture absorbent