Technical informationTECHNOLOGY

VOL.18 NO.2 (published in Dec-2010)

Photo in Cover :RPF-fired fluidized-bed boiler plant
VOL.18 NO.2 (published in Dec-2010)
Introduction of the Approach to Biomass Taken by the Ministry of Agriculture, Forestry and Fisheries
Chiyo INOUE*
(*International Operations Division, Sales Dept.)


With its lack of oil reserves, Japan has long been concerned about the potential impact depletion of global oil supplies will have on energy and petrochemical products. On the other hand, however, with an abundant supply of fresh water and fertile soil, Japan is rich in biomass resources. It is considered that development of advanced utilization technologies for Japan's biomass resources should be encouraged not only as a solution for issues associated with energy security and green house gases arising from fossil fuels, but also as a means to contribute to the revitalization of rural communities. The following summarizes the state of biomass utilization subsequent to the publication of "Biomass Nippon Strategy" by the Japanese Government and outlines measures taken by the Ministry of Agriculture, Forestry and Fisheries to promotion of utilization.

Chemical Agent Reduction Effect by Circulation of Fly-Ash containing Slaked Lime
Masaharu OUE*,Satoshi YOSHIMOTO*,Akihiro MATSUMOTO*,
Masaaki KURATA**,and Norio MAEDA**
(*Energy & Environmental Development Dept., **Mechanical Design & Engineering Dept.)


In order to evaluate a fly-ash circulation system being widespread in Europe, a verification test using an actual gas was conducted after confirming an acid gas elimination effect by fly-ash circulation in a laboratory test. In the laboratory test, it was confirmed that the un-reacted slaked lime is remained inside slaked lime particles in the fly ash discharged from a bag house, and the reaction with the acid gas is further promoted by shaking. In the verification test, a reduction effect on the usage of chemical agents by fly-ash circulation was noticed in the elimination of HCI and SOx respectively. These findings proved that the introduction of the fly-ash circulation system can reduce the usage of chemical agents and running costs.

Operational Report on Joint Sanitary Treatment Union Recycle Center of Higashine City, and Two Other Cities and One Town
Hiroki UENO*
(*Environmental Engineering Dept. Ⅱ)


Because of deteriorated disposal capabilities consequent upon aging of an existing waste disposal facility, which has been running since March 1984, to dispose of recyclable waste produced from three cities and one town, namely, Higashine City, Murayama City, Tendou City, and Kawakita-cho, and in order to comply with the "Act on the Promotion of Sorted Garbage Collection and Recycling of Containers and Packaging (Containers and Packaging Recycling Act)," which was fully enforced in April 2000, we received a construction order from the Joint Sanitary Treatment Union of Higashine City, and Two Other Cities and One Town in May 2008, and we completed this Recycle Center on March 10, 2010. The disposal capability of the Recycle Center is 28 ton/5 h. It has three lines: a bottles/cans, PET bottles, and other plastics containers/packaging disposal line, a waste fluorescent tubes disposal facility, and a waste batteries storage facility. A manual sorting line is arranged in each line to sort out and eliminate hazardous objects, nonconforming objects, and collection bags from among disposal waste and to sort out and collect cullet items by color in the bottles/cans disposal line. Steel cans and aluminum cans are mechanically sorted out and then compressed. For PET bottles and other plastics containers/packaging, special-purpose devices are installed in order to reduce their volume or compress them based on a collecting quality guideline provided by the Japan Containers and Packaging Recycling Association. The following describes the outline and the operational results of the Recycle Center.

Operational Performance of Low-Power Vertical Agitator
-Operational Example of TAKUMA Bio Blade Mix-
Tomoyuki DOI*and Masanobu FUKUZAWA*
(*Sewerage Engineering Dept.)


Since 2005, we have developed and produced low-power agitator (herein referred to as Bio Blade Mix) and we have been incorporating low-power measures into our products. Based on the actual operation data of the facilities where we delivered Bio Blade Mix, it was found that agitating power density, i.e., power consumption per tank capacity, was 1 W/m3. It was confirmed that it could be reduced to 0.15 W/m3 by further intermittent operation. It was also confirmed that activated sludge had larger grain diameter and was more sedimentary in a lower-speed agitator than in a higher-speed one due to the difference in their rotating speeds.

Report on Installation of RPF-fired Boiler with Power-Generation Equipments
Kosaku OMORI*,Hisaaki HIDAKA*and Keiji MUKAI*
(*Energy Engineering Dept. Ⅰ)


The utilization of woody biomass fuel has spread as an alternative for fossil fuels, but RPF is now the focus of attention because of a recent tight supply of woody biomass. The newly revised Containers and Packaging Recycling Law has added recycling as a fuel as a recommercialization method for plastics containers and packaging. The JIS provisions on the quality and grade of RPF have been enacted to prepare an environment for the utilization of RPF, anticipating further expansion in the utilization. This paper reports the RPF-fired fluidized-bed boiler plant delivered to TOYAMA SEISHI CO., LTD. in July 2010. The performance test of the plant confirmed the realization of successful combustion of RPF and exhibition of designed cogeneration capabilities. It also confirmed that the plant satisfied the regulation values related to exhaust gas and incineration ash.