Kazunori Takai

Pyrolysis decomposition of tamarind seed for alternative fuel.

The conversion of tamarind seed into bio-oil by pyrolysis has been taken into consideration in the present work. The major components of the system were fixed bed fire-tube heating reactor, liquid condenser and collector. The crushed tamarind seed in particle form was pyrolyzed in an electrically heated fixed bed reactor. The products were liquid, char and gasses. The parameters varied were reactor temperature, running time, gas flow rate and feed particle size. The maximum liquid yield was 45 wt% at 400°C for a feed size of 3200 μm diameter at a gas flow rate of 6l/min with a running time of 30 min. The obtained pyrolysis liquid at these optimum process conditions were analyzed for physical and chemical properties to be used as an alternative fuel. The results show the potential of tamarind seed as an important source of alternative fuel and chemicals as well.

Feasibility study for thermal treatment of solid tire wastes in Bangladesh by using pyrolysis technology.

In this study on the basis of lab data and available resources in Bangladesh, feasibility study has been carried out for pyrolysis process converting solid tire wastes into pyrolysis oils, solid char and gases. The process considered for detailed analysis was fixed-bed fire-tube heating pyrolysis reactor system. The comparative techno-economic assessment was carried out in US

Response Characteristics and Suppression of Flow-Induced Vibrations of Rectangular Prisms with Rotary Oscillation (2nd Report, Suppression of Flow-Induced Vibration)

for three different sizes plants: medium commercial scale (144 tons/day), small commercial scale (36 tons/day), pilot scale (3.6 tons/day). The assessment showed that medium commercial scale plant was economically feasible, with the lowest unit production cost than small commercial and pilot scale plants for the production of crude pyrolysis oil that could be used as boiler fuel oil and for the production of upgraded liquid-products.

Response characteristics and suppression of torsional vibration of rectangular prisms with various width-to-depth ratios

The present study was experimentally investigated on suppression and characteristics of nowinduced vibrations of rectangular prisms with various width-to-height ratios. ln the previous report, the response characteristics and generation nlechanism of now-induced vibrations of rotary osciHat, ing rectangular prisms were examined. The present report was made on the suppression ofHowinduced vibrations of the redangular prisms with rotary oscillation. As a result of previous paper, it can be seemed that the prevention of rolling up the shear layer separating from the leading edge of the rectangular prism is the most effedive f()r suppressing now-induced vibrations()f it. ln this study,we therefore attempted to prevent the rolhng up of the shear layer by the fonowing three method : placement of a small normal plate at upstream of the prism,attachment of four perforated normal plates on upper and lower side surface,and attachment of triangle fairings on front and rear surface. lmportant results from the present study were that(i)the generation of low-speed and high speed torsion tiutterwere completely suppressed by a normal plate placed at upstream of the prisms,(io the generation of vortex excitation was completely suppressed by four perforated plates attached to upper and loxverside surface,(iii)thegeneration of low-speed and high-speed torsion 面tter were complete】y suppressed by triangle fairing attached to front and rear surface,and(iv) vortex excitation newly generated at the different reduced velodty び。when a normal plate or fairings was set up was completely suppressed by increasing from the threshold value of the reduced mass damping factor Cη。