Session: 17-08-01: Posters Related to Energy

Paper Number: 99769

99769 - 8 Mwth Commercial Unused Biomass Gasifier Development and Demonstration 

Unused biomass such as branches and roots, which are simply thrown away in Korea, are recognized as resources, and many studies are being conducted with interest as a supply fuel for gasification, cogeneration plants, and boilers to produce heat and electricity. In addition, because it is produced in Korea, the supply of unused biomass is easy, and when used after being molded into pellets, it has the advantage of being able to use it as fuel without modification in the existing feeding system.

In this study, the optimal gasification operating conditions were determined through the analysis result of unused biomass pellet used as fuel in 8 MW_th bubbling fluidized bed gasifier system. The silica sand used to the bed material had a particle mean diameter 450 mm. The overall bubbling fluidized bed gasifier system consists of a duct burner; a forced draft (FD) fan; an unused biomass pellet screw feeder; a bubbling fluidized gasifier (3m I.D. x 12 m height); a char recirculation device; an activated carbon bed tar reformer; a cyclone; an air-cooled & water-cooled heat exchanger; an oil scrubber; a cooling, demisting, and filter (CDF) system; an induced draft (ID) fan; a buffer tank; two gas engines; and a combustion furnace and flare stack. The characteristics of unused biomass pellet gasification were investigated at a gasifier temperature of 700-800℃ in a 8MW_th bubbling fluidized bed gasifier system. Afterward, the syngas was passed through a non-dispersive infrared (NDIR) sensor-type gas analyzer (AO2000 Series, ABB) to analyze the syngas composition, lower heating value and cold gas efficiency.

In the case of unused biomass, there are cases where the ash content is 20-30% unlike general woody biomass. Since it also contains a large amount of alkali, the melting temperature of ash is low, so special attention is required to avoid agglomeration during operation. Therefore, the char recirculation device was introduced to periodically discharge the char and remove the inevitable bed agglomerates.

In order to operate the gas engine, tar in the syngas should be removed by the gas cleaning units. Because the tar can cause problems such as fouling and blocked pipes in equipment such as gas engines. In this study, the activated carbon reformer, oil scrubber and CDF were used for tar removal. The final goal of this study is less than 50 mg/Nm³ of tar and more than 2,000 hours of long-term operation performance verification. Syngas power generation efficiency is more than 20%, and the overall system thermal efficiency is more than 80%.

Presenting Author: Sung Jin Park Korea Institute of Energy Research

Presenting Author Biography: I’m a research engineer in Korea Institute of Energy Research (KIER) funded by South Korea<br/>government. My research fields is the gasification of solid fuels (biomass and wastes).

Authors:

Sung Jin Park Korea Institute of Energy Research
Seong-Ju Kim Korea Institute of Energy Research
Soo Hwa Jeong Korea Institute of Industrial Technology
Uen Do Lee Korea Institute of Industrial Technology
Tae-Young Mun Korea Institute of Energy Research
Sang Jun Yoon Korea Institute of Energy Research
Jae-Goo Lee Korea Institute of Energy Research
Ho Won Ra Korea Institute of Energy Research
Sung Min Yoon Korea Institute of Energy Research
Ji Hong Moon Korea Institute of Energy Research