JAPAN TAPPI JOURNALCONTENTS

7July 2024

Vol. 78, No. 7

Energy Saving Ⅱ・Carbon Neutral
1 Activities of Energy-Conservation at Kumagaya Mill……Tatsuya Miyazaki
6 Introduction of Linear Turbine Vacuum Pumps in Jiangmen Xinghui Paper Mill（China）……Noriyuki Fujita
121822

Energy Saving of Compressor Equipment……Hiroaki Fujita
Energy Saving by Adopting High-Efficiency Motor……Hiroomi Ohtajima
Introduction of Energy Saving Cases for Paper Production Part at Sendai Mill……Yuki Iwao

26

Demand-Side Optimization and Cost Reduction Utilizing the Wholesale
Electricity Market……Kenjiro Yagi

31

Development of Gas Combustion Technology for Lime Kiln Toward Realizationof a Carbon-Neutral Society……Hitoshi Inoue

Topics & Information

35

Energy Saving and Operational Improvement for Kraft Pulp Process―Approach Focusing on Processes Involving Black Liquor―……Satoshi Wada

Introduction of Research Laboratories（157）40

Laboratory of Microbial Metabolic Engineering, Department of Materials
Science and Bioengineering, Nagaoka University of Technology

0342

Committee report
Papyrus

48
51
58
5961

Industry News（Domestic and International）
List of Patents issued and Laid-open Publication
Price list of Domestic Logs and Wood Chips by District
Other Monthly Statistics
News from the Association

2024 July JAPAN TAPPI JOURNAL
Vol.78, No.7 Abstracts

Activities of energy-conservation at Kumagaya MillTatsuya Miyazaki
Kumagaya Plant, LINTEC Corporation

It is supposed that greenhouse gas causes various kind of climate change such asincreasing global average temperature. Currently, reducing the amount of greenhouse gasemission is one of the significant issues around the world since greenhouse gas causes sea
level rise, acidification, drought and flood.
New international framework “Paris Agreement” was adopted in the 21st Session of theConference of the Parties to the United Nations Framework Convention on Climate Change(COP 21). Japan set a goal of greenhouse gas reduction 46％ by FY 2030 compared to FY
2013, and companies are taking actions to achieve the goal.
As Energy Saving Act calls for an effort to decrease annual average energy consumption
intensity more than 1 ％ , companies must struggle with energy conservation and CO2
reduction activities.
In above circumstances, this paper introduces a case of contributing to energy saving andCO2 reduction by the CO2 Hot Air Supply Heat Pump Unit, effect of gas turbine CGS
installation with energy service contract and optimized boiler operation.

Introduction of Linear Turbine Vacuum Pumps in Jiangmen Xinghui Paper Mill (China)
Noriyuki Fujita
Kanto Mill (Katsuta), Hokuetsu Corporation

Jiangmen Xinghui Paper Mill Co., Ltd. was launched in June 2011 in Jiangmen City,
Guangdong Province, China, as the first greenfield project among the overseas investments
made by Hokuetsu Corporation. Figure 1 shows the location of the mill. It is a whiteboard
paper mill using recycled paper with annual production capacity of 300,000 tons, that started
commercial operation in January 2015. In the construction of the mill, we adopted the latest
equipment with automatic control technology at the time, and since then we havecontinuously improved the equipment and production technology to stabilize the operationand improve the product quality and reduce the costs.
China is promoting energy conservation as a national policy, and the government sets
energy reduction targets in every five years and each company is required to achieve them,so that we tried various energy-saving projects in the mill.
In this report, we introduce an example of the introduction of linear turbine vacuum pumps
that have achieved great results among them.

Energy saving of compressor equipment
Hiroaki Fujita
IHI Rotating Machinery Engineering Co.,Ltd.*２
In the industrial field, compressed air is widely used as a convenient power source.
Compressor equipment is what produces the compressed air, but the users who operate it have awide range of needs and concerns, such as reducing CO2 emissions and rising electricity costs.
Compressed air trends are constantly changing, and there are many cases where there aretimes when the basic unit (power consumption per unit amount of air) deteriorates due to theinability to operate with the appropriate model or number of units. For this reason, it is ideal forcompressor equipment to be one that does not deteriorate (or change) its basic unit no matter
what the trend situation is, as it is the ultimate energy-saving equipment.
However, given the ever-changing trends in compressed air trends, it is realistically impossible
to operate at the same basic unit throughout the day or throughout the year, but it is possible toapproach the "ultimate energy-saving equipment." be.
First, it is important to know the operating status of the compressor through trend analysis andto confirm whether the compressor's characteristics are being utilized. In addition, we recommend
planning from a broad perspective, including investigating the Control device, piping equipment,
air leaks, maintenance status, etc. There are always hidden hints for improvement.

Energy Saving by Adopting High-Efficiency Motor
Hiroomi Ohtajima
Tokai Mill, Oji F-Tex Co. Ltd.

In September 2020, the Oji Group formulated an Environmental Action Program 2030
with fiscal year 2030 being the target achievement year and Environmental Vision 2050, a30-year long-term vision from now. In Tokai Mill as well, to achieve the target, we areworking to improve our energy efficiency with a target reduction in energy consumption
intensity of at least 1% per year, averaged over five years.
In this paper, we focus on the fact that many motors on operating in plant are standardefficiency induction motors and introduce an example of replacing them with high-efficiency
motors.

Introduction of energy saving cases for paper production part at Sendai mill
Yuki Iwao
Sendai Mill, Chuetsu Pulp & Paper Co.LtdCarbon neutrality trials are currently being actively carried out around the world, andour mill has been engaged in energy-saving activities for long term. The present trends
are also reflected to quality demands, and many variations are also required to theoperations of the papermaking process.
Changes in operations are bringing companies the opportunity to achieve improvements topreviously common operating patterns and get energy-saving without affecting the quality.
This paper introduces trials of energy-saving case implemented in the papermaking
process at our mill.

Demand-side optimization and cost reduction utilizing the wholesale electricity market
Kenjiro Yagi
Tokushu Tokai Paper Co., Ltd.

TOKUSHU TOKAI PAPER CO., LTD.'s Mishima Plant participated in the wholesale
electricity market and began adjusting the operation of its own power generation facilities
according to market prices and power supply and demand conditions. In addition to achieving
cost reductions by purchasing electricity at low prices and selling electricity at high prices, it
has also achieved "optimization of electricity demand" through upward and low DR. It isconsidered to be an initiative that will contribute to the elimination of the duck curve
phenomenon, which has become a global issue due to the expansion of renewable energy.

Development of Gas combustion technology for Lime Kiln towardrealization of a Carbon-neutral society
Hitoshi Inoue
Business Development Department, Daigas Energy Co., Ltd.

Efforts to reduce CO2 emissions are accelerating toward the realization of a carbon-neutral
society by 2050, but fuel oil C and other fuel oils are mainly used for Lime Kiln in the paperindustry in Japan. These emit more CO2 per calorific value than Natural gas, but they are
generally cheaper. Therefore, simple fuel conversion to Natural gas has been a challenging
situation. In this problem, we’ve been working to improve our customers' specific energy
consumption and reduce CO2 emissions by advancing our existing technologies including
energy-saving and others.
Gas atomizing combustion is one of the mixed combustion technologies of fuel oil andNatural gas without changing the existing burner. By designing the nozzle and optimizing
the flame shape according to the customer's facility, we have succeeded in improving theLime firing rate, lowering NOx emissions and so on. Our gas atomizing combustion
technologies are already adopted in four Kilns at two customers, and that contributes toapproximately 20% CO2 emission reduction compared to fuel oil combustion.
Regarding the gas firing burner technology, we have developed a new gas burner with ahigh-brightness flame for Lime Kiln. We can optimize the flame shape and temperature
distribution by introducing main gas burner and auxiliary burners around the main burnerand adjusting each input balance and gas jet velocity. We plan to conduct combustion tests
of gas firing burners in our customer’s furnace during 2023 and to promote their introduction.
It is important to steadily promote low carbon emissions by converting fuels to Natural gas
through the introduction of gas atomizing and gas combustion technologies. In addition,
carbon neutrality can be achieved in the future by methanation to customers that alreadyuse natural gas. With these technologies, we’d like to contribute to the realization of a carbonneutral society in 2050.

Energy saving and operational improvement for kraft pulp process- processes involving black liquorSatoshi Wada
Pulp & Paper Technology Section, Kurita Water Industries Ltd.

At pulp and paper mills, the demand for improved production efficiency and energy
conservation continues to increase due to various factors such as fluctuations in raw material
prices and soaring fuel prices in recent years.
Here, the cooking process and the evaporator are processes that use a lot of energy in the KP
process, and stable operation and productivity maintenance are very important processes.
In these processes, the adhesion of deposits causes a decrease in productivity and energyloss.
As a countermeasure against deposits, as a countermeasure using water treatment chemicals,
it is ideal to wash with a cleaning agent and maintain a clean state with a preventive agent.
Since deposits have different components depending on where they are generated, it isnecessary to use appropriate chemicals according to the components and where they aregenerated.
This report introduces the theory and application of detergents and scale inhibitors toimprove scale and organic matter adhering to digesters and evaporators as methods ofimproving operations and reducing energy loss related to deposits.