Entity

Time filter

Source Type

Kanazawa-shi, Japan

Nakamura S.,Tokyo Institute of Technology | Kitano S.,Maywa Co. | Yoshikawa K.,Tokyo Institute of Technology
Applied Energy | Year: 2016

We develop tar removal technologies by using byproducts (bio-oil and char) in order to achieve low-cost and highly effective tar removal using only secondary removal methods in a pilot-scale gasification facility. The tar removal performance of a 100-L bio-oil scrubber and a 13-kg char filter is investigated with an up-draft gasifier. The tar removal rate of the bio-oil scrubber at 40, 50, and 60 °C is measured; the highest removal rate is 64.5% at 50 °C. Furthermore, even though the tar removal performance of water/oily scrubber generally degrades, that of the bio-oil scrubber does not decrease even after use for 22.5 h. The char can also be used as a tar adsorbent, like activated carbon, because of its high porosity. The char bed filter removes 81.5% of the tar from the producer gas at the beginning of the operation. The entire tar removal system, including the bio-oil scrubber and the char bed filter, exhibits a 98% tar removal rate. © 2016 Elsevier Ltd. Source


Miyawaki O.,Ishikawa Prefectural University | Gunathilake M.,Sudan University of Science and Technology | Omote C.,Ishikawa Prefectural University | Koyanagi T.,Ishikawa Prefectural University | And 6 more authors.
Journal of Food Engineering | Year: 2016

Progressive freeze-concentration (PFC) by a tubular ice system was successfully applied to concentrate apple juice from 13.7 to 25.5 oBrix under a program controlled operation for the coolant temperature and the circulation pumping speed. The organic acid distribution and the flavor profile analysis revealed that no substantial differences were observed for the juice before and after concentration both in organic acids and flavor components showing the high quality concentration by PFC. This was also confirmed by electronic taste and flavor analyzers. The PFC-concentrated apple juice was fermented to obtain a new type apple wine with alcohol content as high as 13.7 vol-% without chaptalization. The organic acid distribution was slightly changed before and after fermentation while the flavor profile changed drastically. The present technique will be applicable to produce new type of wine from many other fruits. © 2015 Elsevier Ltd. Source


Nakamura S.,Tokyo Institute of Technology | Siriwat U.,Tokyo Institute of Technology | Yoshikawa K.,Tokyo Institute of Technology | Kitano S.,Maywa Co.
Energy Procedia | Year: 2015

The technical obstacle of biomass gasification technology is the effective removal of tar, which will cause the clogging of pipes and engines. In this research, in order to develop the low-cost and high-efficiency tar removal technologies, the tar removal performances of bio-oil and char, which are the by-products of biomass gasification processes, were investigated. For this research, the scrubber with 100L of bio-oil and the char bed with 10 kg of char and 3 kg of activated carbon were prepared in the pilot-scale gasification plant. The results show that the bio-oil scrubber and the char bed were effective for tar removal and both of them removed about 60% of tar from the producer gas. It is noteworthy that the tar removal performance of the bio-oil scrubber did not decrease with the passage of time. This implies that the bio-oil scrubber had some big advantages, such as no cost for purchase and transportation of absorbent and no need to change the absorbent inside the scrubber. © 2015 The Authors. Published by Elsevier Ltd. Source


Miyawaki O.,Ishikawa Prefectural University | Omote C.,Ishikawa Prefectural University | Gunathilake M.,Sudan University of Science and Technology | Ishisaki K.,Ishikawa Agriculture and Forestry Research Center | And 3 more authors.
Journal of Food Engineering | Year: 2016

A 25L-scale tubular ice system for progressive freeze-concentration was constructed and combined with a 75L-scale partial ice-melting system for yield improvement. From the measurement of freezing point of various fruits juices, nine standard operation programs were prepared in cooling and circulation flow rate for the tubular ice system. The standard programs were successfully tested for progressive freeze-concentration of sucrose solutions with concentration varied from 3 to 30%. By choosing one of the standard program, apple juice was effectively concentrated from 12.8 to 21.0 °Brix with 79.0% yield, which was improved to 90% by recovering the 30% of the initially-melted fractions by using the partial ice-melting system. The tubular ice system can be easily scaled-up more, if necessary, simply by increasing the number of tubes. © 2016 Elsevier Ltd. Source


Nakamura S.,Tokyo Institute of Technology | Unyaphan S.,Tokyo Institute of Technology | Yoshikawa K.,Tokyo Institute of Technology | Kitano S.,Maywa Co. | And 3 more authors.
Biofuels | Year: 2014

Biomass gasification is an attractive power generation technology that can generate electricity without any increase of CO2 concentration in the atmosphere. However, many technical problems have still to be overcome. The biggest technical obstacle for the operation of a commercial gasification plant is the elimination of tar in the producer gas. Tar will condense at the ambient temperature and will cause clogging of pipes and engines. Therefore, effective and economical tar removal methods are required. In this paper, the bio-oil, which was obtained from the existing pilot-scale gasification plant, was utilized as an absorbent for removing tar from the syngas. The result showed that the bio-oil absorbent was effective for tar removal and 73.3% of the gravimetric tar was removed by the bio-oil absorbent at 50°. © 2015 Taylor & Francis. Source

Discover hidden collaborations