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Hokkaido, Japan

Maeda N.,Takuma Co.
Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B | Year: 2013

We have developed a new exhaust-gas treatment system using ceramic filters with a sodium reactant that removes particulates and acid gases in the temperature range of 300 C. This system has been applied to a kiln-type pyrolysis gas melting plant for MSW (70t/24h x 2 units). As the heat source for the pyrolysis, this plant uses the exhaust from burning the combustible gas generated by the pyrolysis process. This new filtration system has been applied to this exhaust gas at the temperature range of 300 C for the removal of the particulates and acid gases. The filter element is made of sintered materials (produced by Kyocera Co.) and is stronger than those made of fabrics. This plant began an operation with load in June of 2005 The pressure loss of ceramic filter is approximately 3 1 kPa at the filtration speed of 1.5 mlmin, approximately 7 years after startup, and the operation has been continuing in a stabilized manner. Also, used filter is renewable by washing, so the filter can be used for long period. © 2013 The Japan Society of Mechanical Engineers. Source

Matsumoto K.,Chuo University | Sakaguchi T.,Takuma Co. | Tsubaki D.,Chuo University | Kubota H.,Chuo University | And 2 more authors.
International Journal of Refrigeration | Year: 2015

There has been considerable research on reducing the force of ice adhesion to cooling solid surfaces. One of the present authors has also studied various methods of reducing or increasing the ice adhesion force. One promising method involves the use of a thin silane-coupler film coated on the solid surface. Using this method, the ice adhesion force can be controlled by altering the organic functional groups of the silane-couplers. However, the characteristics of such thin films usually depend on their formation conditions. Therefore, in this work, two kinds of silane-couplers were investigated. The thin film coating thickness and ice adhesion force to the coated test plate were measured for two kinds of test plate materials, test plate immersion times in the silane-coupler mixtures, and silane-coupler concentrations. Moreover, a durability of surface modification effect due to the thin film and a mechanical durability of the thin films were also investigated. © 2015 Elsevier Ltd and IIR. Source

Takaoka M.,Kyoto University | Takeda N.,Ritsumeikan University | Yamagata N.,Kobe Steel | Masuda T.,Takuma Co.
Journal of Material Cycles and Waste Management | Year: 2011

We discuss the current status of waste to power generation (WPG) in Japan and various scenarios involving indirect reduction of carbon dioxide emissions by WPG. The number of WPG facilities domestically as of 2005 was 286. Power generation capacity attained 1,515 MW and power generation 7,050 GWh/year. This amount substitutes energy otherwise acquired from natural resources such as fossil fuels in thermal power plants. If the basic unit of carbon dioxide is 0.555 kg-CO 2/kWh, then the corresponding carbon dioxide emission reduction is calculated to be 3.9 million tons, equivalent to 26.7% of the 14.6 million tons emitted by municipal solid waste incinerators (MSWI) in 2005. Using various existing technological options, the power generation efficiency could reach more than 20% in MSWI facilities with capacity of 300 tons/day, although present efficiency is only 12.0%. If about 85% of MSW were incinerated in MSWI with power generation efficiency of 20% as a feasible assumption, the total power generation and the corresponding carbon dioxide reduction would be 16,540 GWh/year and 9.18 million tons, respectively, equivalent to 62.7% of the carbon dioxide emitted by MSWI. Also, the ratio of the additional reduction of carbon dioxide emissions by WPG to the total additional reduction (20,000 ktons/year) in Japan during the first commitment period would be 26.3%, suggesting that promotion of WPG in MSWI is an effective option for prevention of global warming. © 2011 Springer. Source

Takuma Co. | Date: 2000-10-24

filters for use in purifying air and gases.

Yang S.,Kyushu University | Saffarzadeh A.,Kyushu University | Shimaoka T.,Kyushu University | Kawano T.,Takuma Co.
Journal of Hazardous Materials | Year: 2014

Municipal solid waste incineration (MSWI) is widely used in Japan, through which large amount of incineration residues are produced. The recycle/reuse of the incineration residues is troubled by many factors. This paper studied the MSWI bottom ash with the principal focus on Cl. Both bulk analysis and microanalysis methods have been carried out. The bulk analysis disclosed a particle-size dependent pattern of the Cl content in the bottom ash and the insoluble Cl is essentially in the form of Friedel's salt (3CaO·Al2O3·CaCl2·10H2O). The microanalysis revealed that Cl preferentially exists in the quench phase of the individual bottom ash particle. Since Friedel's salt and the other quench products are thermally unstable, a series of thermal treatments were carried out to decompose such Cl-bearing phases. The experimental results showed the total Cl content in the MSWI bottom ash was reduced by 55.46% after a 4-h heating process at 1000°C. The removal of the soluble Cl (originally as alkali salts) by the thermal process was found to be more effective. However, the insoluble Cl content in the heated sample was barely lowered owing to the formation of calcium chlorocalumite (11CaO·7Al2O3·CaCl2) in the course of heating. © 2013 Elsevier B.V. Source

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