|2011 July JAPAN TAPPI JOURNAL
Vol.65 No.7 Abstracts
The Activities for Energy Saving in Tomioka Mill
Tomioka Division, Oji Engineering Co., Ltd.
Oji Paper Group work for reducing the amount of CO2 emission derived from the fossil energy and effort to conserve energy and switch to an alternative fuel. Although paper production is on the decrease, we’ve succeeded in reducing 6% energy compared with 2008. Energy-saving extraordinary team has been organized for activity energy saving at Tomioka Mill since August 2009.
This report presents an outline of the energy-saving sectional meeting and our energy saving efforts on several cases at Tomioka Mill.
The Activity of Energy Saving in Niigata Mill
-Energy Saving at Large Paper Machine-
Niigata Mill, Hokuetsu Kishu Paper Co, Ltd.
Recent years, the global warming is the one of the biggest issue for us. Especially, reducing carbon dioxide emissions which are well known as a greenhouse gas is our main concern. Because of these movements, we need to expedite both the reducing fossil fuel consumption and the saving other energy consumptions at the same time. In order to approach these issues, we have started the energy saving program at Niigata mill since 1980’s and these works have brought great success. However, after we installed the new paper making machine PM9 and converted the other related processes such as the pulping, the bleaching and the chemical recovery facilities, the energy consumption surged and that cost put pressure on our profit. In this report, we introduce the energy saving program at the Niigata mill and give the detail of our achievements after we installed and converted the new processes.
Oil Saving by the Mixture Combustion of Wood Chip Dust Fuel in the Recovery Boiler
Sendai Mill, Chuetsu Pulp & Paper Co., Ltd.
Recently, many people concern about environmental issue especially global warming effects, it is important for us to reduce greenhouse gas CO2 emission.
Sendai Mill is managed by single boiler system - No.6 recovery boiler (6RB), produces sufficient amount of steam to maintain the mill operation. RB main fuel is black liquor though we have to use crude oil additionally due to lack of steam amount and control the pressure, accordingly the oil mixture ratio reaches up to 20% in calorie basis.
As follow, we introduce 6RB oil consumption saving method by utilizing wood dust fiber screening away from our own material wood chips and purchasing wood dust fuel.
Power Plant Optimization by Using Steam Generated from No.5 Boiler (PS Boiler) as Middle Pressure Steam for Process Use
Iwanuma Mill, Nippon Paper Industries Co., Ltd.
The PS Boiler (No.5 Boiler) plays an important part in Iwanuma mill. This boiler burns up all of paper sludge and DIP dregs that are generated during pulp production process. No.5 Boiler steam has been supplied to the condensing Turbine-Generator (4T/G), so we have examined whether we can utilize No.5 Boiler steam as the moderate pressure steam for supply to process in our mill. Because the power generation efficiency of condensing Turbine-Generator is generally low comparison with that of condensing extraction Turbine-Generator (3T/G, 6T/G). This means that increase of power supply to process by decreasing the moderate extraction steam increasing condensate flow in 3T/G or 6T/G.
In this time, we will introduce how we have optimized generation power and steam in our mill by utilizing No.5 Boiler steam as the moderate pressure steam for supply to process.
Energy Saving by Turbine Load Optimization System
Yatsushiro Mill, Nippon Paper Industries Co., Ltd.
Power plants of most paper mills consist of plural boilers and turbines, which supply steam and power to meet the process requirements. In our mill operators are controlling the balance of the turbine loads with as much load as possible of the high efficiency turbine. However, it is difficult to keep the cost minimum operation all the time manually responding to the process conditions. In order to further improve the efficiency we studied the Turbine Load Optimization System with simulations and some actual tests together with the vendor. The results made us expect the reduction of the steam consumption. We installed the system last September in Yatsusiro mill to realize the supposed improvement.
This article introduces a case study of the system, current problems and countermeasures against them.
Energy Saving of Compressor Driven by Assisting in Steam Turbine
Tonegawa Board Mill, Rengo Co., Ltd.
Rengo established “Eco Challenge 009” in 2001 as the company’s environmental objective and has strenuously worked on energy saving, reduction of wastes and effective utilization of resource toward the year 2009, the 100th anniversary of the company.
On 2009, the final year for the Challenge, the company achieved to reduce carbon emissions by 26.8% compared to 1990 levels, considerably exceeding the targeted value of “Eco Challenge 009” by 22%. Under “Eco Challenge 020”, the company follows its slogan of “Less Weight, Less Carbon” and aims to reduce carbon emissions by 32% compared to 1990 levels.
The paper will introduce energy saving made possible by changing the control of air compressor operation by using the steam turbine and motor drive combination system, which was newly installed to replace the aging air compressor of Tonegawa PM1.
Energy Saving & CO2 Reduction by High Efficient Steam System
-High Efficiency Control Method of Once Through Boilers in Multiple Installation and Air Compressor Utilizing Process Steam Differential Pressure-
Masahiko Murakami, Tomohiro Okubo and Yasukuni Tanaka
MIURA Co., Ltd.
MIURA as a leading manufacturer of small once-through boilers has adopted “Plant infrastructure total solution” as a slogan and is promoting various eco-friendly proposal activities through water treatment devices for industrial water and compressors using in-plant process steam, and so on. This paper explains following technologies;
〉Small once-through boilers with very high efficiency and multiple boiler installation system by using each boiler’s most efficient operation point
〉Features and energy-saving effects of the steam-driven air compressor with compression heat recovery unit
Energy Saving by Replace of the Aeration Device and the Energy Saving Type Blower Introduction
Osaka Mill, Oji Paperboard Co., Ltd.
The long recession causes the big profit decrease in the paper manufacture industry. The paper manufacture industry uses a lot of energy. Therefore we can get big profit by energy saving. In addition, I have to do energy saving to prevent global warming. In our company, the energy saving is one of the most important problems.
The observance of the environmental conservation is important now, too. The improvement of the facilities which balance energy saving with processing capacity stabilization about the facilities of the drainage processing is demanded. We introduce a high efficiency aeration pipe and an energy saving type aeration blower as an energy saving example this time. These introduced it for energy saving of the aeration tank in facilities of the drainage processing and stabilization.
Successful Cases of Energy Conservation
The Energy Conservation Center, Japan
Successful cases study workshop in Japan was started as an opportunity to report the results of desperate energy conservation efforts which had been made mostly by the industrial community since the first oil crisis of 1973. The first convention called Energy Conservation Excellent Instance Workshop was held in 1978 by Japan Thermal Energy Engineering Association (sponsored by then-Ministry of International Trade and Industry). When experienced the second oil crises in 1978, Japanese industry and economy were forced to address further energy saving to overcome the crisis.
Later on the Energy Conservation Center, Japan took over as an organizer, but it was continued and held 35 times so.
Principle of Measurement of 3D Coordinate Measuring System MONMOS and Its Application
Katsuyuki Nagai and Hajime Honda
SOKKIA TOPCON has produced a 3-D coordinate measuring system, “MONMOS”, using the NET series, an instrument based on a surveying total station. The original purpose of the system is measurement in the construction, plant facilities and tunnel management fields but is also widely used for precise measurements of bridge parts and alignment of machine installation, fields in which it is now highly valued by customers. In this report, we explain the principals and specifications of our “MONMOS” system and introduce an example of use thereof in the field of paper manufacturing in Germany.
Preparation of Visible-light Responsive Photocatalyst from Paper Sludge Ash (PS ash)
Ehime Institute of Industrial Technology
Naoto Matsue and Teruo Henmi
Agriculture Facility of Ehime University
Visible-light responsive TiO2 photocatalyst were prepared by calcinations with NH4Cl after alkali hydrothermal reaction of PS ash containing TiO2. Obtained samples showed the absorption in the visible light religion of 400nm to 500nm by UV-Vis diffuse reflectance spectrometer analysis. Gaseous acetaldehyde removal experiments were carried out to evaluate photocatalyic activity for treated PS ash under visible-light irradiation. The treated samples have ability of decomposing acetaldehyde to carbon dioxide under visible-light irradiation.
Key words: PS ash, visible-light response, photocatalysis, acetaldehyde