JAPAN TAPPI JOURNALCONTENTS

6June 2024

Vol. 78, No. 6

Energy Saving Ⅰ
1 Report of the 28th Saving Energy Semiar……Energy Committee, JAPAN TAPPI
4 Green Ammonia Value Chain……Yoshihiro Menju
11 Operation Experience of No. 5 Recycling Boiler……Tatsuhiko Ohira
1621

Go Green with Pumps !

―Realize Energy Saving and Carbon Dioxide Reduction !―……Yota Fujimoto

Energy Saving by Converting Factory Raw Water Pumps to Inverters……Yoshimasa Ikeda and Mitsuhiro Murata

Topics & Information

27Steam Driven Screw-type Air Compressor System for Energy-saving……Masaru Sakakida31

Operating Experience of Biomass Boiler……Shuhei Yomo

35

A Report on Technical Exchange Meeting with IPPTA（Indian Pulp andPaper Technical Association）……Terunobu Fukui

Introduction of Research Laboratories（157）42

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

03
41
44
46

Committee report
Coffee break
Essay on Intellectual Property
Papyrus

47
51
60
61
63

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 June JAPAN TAPPI JOURNAL
Vol.78, No.6 Abstracts

Green Ammonia Value Chain
Yoshihiro Menju
IHI Corporation
Fuel ammonia is in the spotlight as one of the next-generation energies for achieving carbon
neutrality as it does not emit CO₂ during combustion. In the IHI Group, the renewable energy derived green ammonia production business is positioned as the core of future decarbonization
business.
In addition, considering the future mass consumption of fuel ammonia, IHI is engaged in a wide rangeof activities to build a value chain that extends not only to the production of green ammonia, but also tothe transportation, storage, and utilization technology development.
For ammonia production, in other words the upstream part of our value chain, IHI is conducting
surveys and studies for cost-effective green ammonia production in countries such as India and Australia,
as both have abundant renewable energy resources. For transportation and storage, or the midstream
part of the value chain, IHI is developing ammonia fuel ships that do not emit CO₂ during transportation,and the conversion of LPG tanks and large storage tanks for the construction of large ammonia receiving
terminal. Finally, in the downstream part of the value chain, IHI is developing technologies to utilize
ammonia, such as boilers, gas turbines, and gas engines.
IHI Group is determined to contribute to the realization of a sustainable society by establishing a green
ammonia value chain and promoting decarbonization globally.

Operation experience of No.5 Recycling Boiler
Tatsuhiko Ohira
Iwaki Daio Paper Corporation
Iwaki Daio Paper started commercial operation of No.5 recycling boiler (Mitsubishi Heavy Industries
Power IDS Co., Ltd.) on February, 2023.
A feature of the No.5 recycle boiler is that by setting the steam temperature to around 300℃, thetemperature of metal is kept away from the corrosive range, reducing high-temperature corrosion of theboiler tubes caused by chlorine. Its greatest strength is that this allows the use of a wide variety of wastematerials, such as fuel derived from waste that would be difficult to use with conventional equipment
and would otherwise be landfilled or simply incinerated.
During the commissioning run, a big clinker was generated. This is because the co-firing of RPF andheavy fuel oil A locally raised the temperature of the fluidized sand too high around the burner, and themolten fluidized sand mixed with "combustion ash" and "agglomeration generated in the bed." This
problem was resolved by reviewing the fuel combination and has not recurred. Furthermore, thinning of
the thermal spray coating that protects the in-bed evaporator tubes has been showing signs of wear since
the beginning of the test run, and we are working with the manufacturer to take measures to extend thelife of the tubes, with the goal of expected continuous operation.
This article provides an overview of the recycling boiler's equipment, operational experience, andtrouble cases.

Go green with pumps!
-Realize energy saving and carbon dioxide reduction!Yota Fujimoto
Torishima Pump Mfg. Co., Ltd.
Due to soaring fuel prices and the promotion of carbon neutrality, interest in energy saving
within factories is increasing. Particularly in the paper industry a large amount of water isconsumed such as raw water in the pulping process, boiler water, and various types of coolingwater, and therefore the pumps that transport the water consume a large amount of electricity.
This shows that it is important to achieve energy savings with pumps in factories. However,pumps are not often considered as means for energy saving, because it is difficult for user to selectoptimum pumps which are not standard products and lifespan of pumps is so long that they are
rarely replaced.
Our company has greatly contributed to energy saving with developing high-efficiency pumpand giving advice for energy saving with pumps. Based on our experience, we will introduce inthis article our activities of proposal for energy-saving and methods for energy saving with pumps
used in the paper industry for three systems: the white water system, the boiler area and thecooling water system, such as adopting high-efficiency pumps and optimizing pump specifications.

Energy saving by converting factory raw water pumps to inverters
Yoshimasa Ikeda and Mitsuhiro Ｍurata
Iwakuni Mill Nippon Paper Industries Co., Ltd*１
Nippon Paper Group operates under the slogan “Shaping the future with trees” as a comprehensive
biomass company with the goal of creating new value never seen before and contributing to better living
and cultural progress. As part of our activities, we are working to reduce greenhouse gas emissions by
54% compared to FY2013 in FY2030, with the aim of achieving carbon neutrality in FY2050.
This paper reports on the significant energy savings achieved by converting two raw water pumps(wire-wound high voltage motor) used at a water source from commercial power supply drive to inverter
drive. It also introduces the troubleshooting measures taken for vibration, noise, and instantaneousvoltage drops during lightning strikes that occurred when the two pumps were upgraded one by one.

Steam Driven screw-type air Compressor system for Energy-saving
Masaru Sakakida
Industrial Machinery Dept.3 Gr.1atsubo Corporation
The recent rise in electricity costs due to the high cost of electricity and fuel has placed a heavy burden
on industry.
This paper introduces a technology for operating compressors using waste steam.
This technology was developed more than 10 years ago and has many installations.
Due to the recent high energy prices, the cost benefits are now even greater than before, so a faster returnon investment can be expected.

Operating experience of Biomass boiler
Shuhei YomoTonegawa Division Paper Mills Rengo Co.,Ltd.
Environmental initiatives are becoming increasingly important for all companies. Rengo
formulated “Eco Challenge 2030” that targets reduction of CO2 emissions derived from fossil
energy by 46% by FY 2030 compared to FY 2013.
To achieve this target, Tonegawa Division commenced operation a new biomass boiler for power
generation that utilizes fuel source such as waste woodchips, RPF, and scrap tires in October2022.
The steam conditions of new boiler were planned to be equivalent to the existing gas boiler, andthe existing boiler is currently utilized as a backup.
This report shows overall of the new biomass boiler, operational experiences and trouble cases sincecommissioning.

A report on technical exchange meeting with IPPTA (Indian Pulp and Paper Technical Association)
Terunobu Fukui*２
JAPAN TAPPI*１
39 people from the Indian Pulp and Paper Technical Association (IPPTA) came to Japan and technicalexchange events that included mill tours, theme presentations, and a social gathering were held. For themill tours, from March 4th to 6th, they visited Rengo Co., Ltd. Yashio Mill, Ichikawa Co., Ltd. Kashiwa
Mill, Oji Materia Co., Ltd. Fuji Mill, Nippon Paper Crecia Co., Ltd. Koyo Mill and Hokuetsu Corporation
Niigata Mill. The theme presentation and social gathering were held on March 7th at the Kmiparupukaikan in Ginza, Tokyo.
In the theme presentation, IPPTA made a presentation regarding the status of India's pulp and paperindustry, with the following main points:
・There are 569 paper mills in India.
・Production capacity in 2022-23 is 32 million tons, and both production and demand are approximately
26.5 million tons.
・By raw material used, recycled fiber accounts for approximately 80%.
・Paper demand will grow significantly in line with future growth in GDP.
The Japanese side made presentations on the following seven themes.
(1) Issues in the Japanese paper industry and initiatives towards net zero CO2(2) Measures to secure fiber (wood and recovered paper) for future(3) Measures to improve the industry image(4) Water management strategies, Water saving initiatives(5) Equipment reliability measures and initiatives towards predictive maintenance(6) Initiatives to improve automation using AI and operator skills(7) Collaboration with Government, Industry, Institutions and Society