All publications

Pyrolysis Investigation For Bio-Oil Production From Various Biomass Feedstocks In Thailand

Suneerat Fukuda

International Journal of Green Energy · 2014

This study investigated the bio-oil production from vacuum pyrolysis of potential biomass feedstocks in Thailand. Experiments were carried out on palm empty fruit bunch, rice straw, rice husk, eucalyptus wood, rubber wood (Hevea Brasiliensis), and Teng wood (Shorea Obtuse) in a lab-scale-fixed bed reactor. The results showed that the product distribution was strongly dependent on temperature and biomass properties. Maximum oil yields, i.e., 50–60 wt %, were reached at 450–550°C. Due to mild temperature, most of alkalis originally present in biomass concentrated in product char, and only traces were detected in oil. Two-third of energy in biomass was in the product oil.

Ash and deposit characteristics from oil-palm empty-fruit-bunch (EFB) firing with kaolin additive in a pilot-scale grate-fired combustor

T. Madhiyanon, P. Sathitruangsak, S. Sungworagarn, Suneerat Fukuda, Suvit Tia

Fuel Processing Technology · 2013

Yield and Characteristics of Tar Formed during Biomass Fluidised-Bed Gasification

Kaweewong Wongayara, Suneerat Fukuda

Journal of Sustainable Energy and Environment · 2013

In this study, the behavior of gasification tar formed was investigated in a 100 kWth bubbling fluidized-bed gasifier using rubber woodchip as fuel. Tar yield and characteristics as well as the composition of product gas were monitored and correlated with respective gas residence time, which were varied by means of gas sampling at different positions, i.e. four along the height of the gasifier and one after the cyclone. At selected experimental condition (ER=0.33), the significant concentrations of CO and H2 were formed at 4.8 s, after which the increased concentrations of CO and H2 at longer residence times may be attributed to the tar reforming reactions and thermal cracking. The total gravimetric tar increased from 4.5 to 10.5 g/Nm3, when the residence time was increased from 2.5 to 9.8 s. The increasing gravimetric tar yield as the residence time increased inside the gasifier suggests that more tar was formed as it was exposed to high temperature. The concentrations of all tar major species also increased following the trend of gravimetric tar yield, but the ratio of smaller molecular weight materials increased at extended residence time. This therefore suggests that longer residence time would be preferable as it would allow more time for the reaction of tar vapor to crack into smaller molecular weights and to form more product gases.

Bio-oil Production from Vacuum Pyrolysis of Palm Empty Fruit Bunch: Effect of Operating Conditions and Process Energy Balance

Suneerat Fukuda

Journal of Sustainable Energy and Environment · 2013

This study investigated the effect of temperature, heating rate and particle size on the yields of pyrolysis products from palm empty fruit bunch (EFB). Experiments were carried out in a lab-scale fixed bed pyrolysis system under vacuum condition. Under all conditions studied, the liquid product or known as bio-oil appeared to be dominating. The total liquid (organic + water) yield reached its maximum at 550°C with around two-third being organic and the rest being water. Increasing the particle size generally increased gas yield and decreased liquid yield. However, the catalytic effect of inorganic matters could also have some role during pyrolysis. Higher heating rates increased the yield of organic fraction and overall pyrolysis conversions. The mass and energy balance analysis showed that about two-third of the energy from biomass was concentrated in the liquid product. If not being able to utilize the product char due to the high content of alkalis and only the product gas was used to provide energy for pyrolysis reactions, the net efficiency of the process will largely be affected by the required process energy consumption and the import of external energy may be needed.

Design of a new-generation coal-fired marine steam propulsion plant

Atsuo Fukugaki, Suneerat Fukuda, S. Nakamura, Yuki Sakamoto

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) · 1982

A new-generation coal-fired marine steam propulsion plant, consisting of all-coal fired twin-boiler installations and their associated coal bunkers, daily service hoppers, coal and ash handling systems, ash retention and disposal systems, etc., to drive a main propulsion turbine rated to develop 19,000 shp, was devised for installation in two 74 700-dwt bauxite carriers. Boilers are equipped with a special automatic combustion control system, and coal transfer from the bunkers to daily hoppers is in the dense phase. As part of this project, a training simulator also was devised for training and education of the ship engine room personnel as well as for use in testing of the plant equipment.

STUDY OF TREATMENT OF TANKER DISCHARGED OILY WATER WITH IMPROVED TYPE SLOP TANK

Suneerat Fukuda, Yasuhiko Seike, Makoto Nakajima, H Taniguchi

1976

Although the segregated ballast system adopted at the 1973 Convention of the International Maritime Consultative Organization (IMCO) is effective in preventing seawater pollution by oil, it is applicable only to tankers built after 1972. Far more practical for a large number of existing tankers is the use of load-on-top (LOP) system with some improvements. This paper describes the development of such an improved LOT system, as well as an improved slop tank which facilitates oil and sludge disposal outboard.