A Prototype Downdraft Gasifier Design with Mechanical Stirrer for Rice Straw Gasification and Comparative Performance Evaluation for Two Different Airflow Paths

Year 2018, Volume: 24 Issue: 3, 329 - 339, 05.09.2018

İbrahim Savaş Dalmış , Birol Kayişoğlu Serkan Tuğ Türkan Aktaş Mehmet Recai Durgut Figen Daşçı Durgut

https://doi.org/10.15832/ankutbd.456649

Cited By: 3

Abstract

In this research, a prototype downdraft throatless gasifier was designed with a mechanical stirrer. The gasifier was designed for gasification of rice straw pellets. The diameter of the reactor was 350 mm and a nominal value for the heat power of biomass input was 70 kW. Rice straws which were collected from Thrace Region of Turkey gasified for determination of the designed gasifier performance in Namik Kemal University Biosystem Engineering Laboratories. The effects of airflow path and stirring process on the gasification efficiency during the gasification process were investigated. Temperatures and airflow rates observed and adjusted by controlling the air flow rate in the automation system constantly. Pellets were gasified using two different airflow paths with the same equivalence ratio of 0.2 and these were compared. Air inlet from the top showed better results than air inlet from tuyeres. For the air inlet from the top, the higher heating value of producer gas was determined as 5.047 MJ Nm-3 and cold gas efficiency was calculated as 65.4%. H2/CO ratio was found as 1.385 which was higher than the air inlet from tuyeres. 

Keywords

Biomass gasification; Rice straw; Stirrer; Throatless; Downdraft; Gasifier design

References

• Anis S & Zainal Z A (2011). Tar reduction in biomass producer gas via mechanical, catalytic and thermal methods: A review. Renewable and Sustainable Energy Reviews 15(5): 2355-2377
• Anonymous (2017). Kiltas Refractory Materials Industry Inc. Refractory Materials, Concretes, Hycast® 70. Retrieved in March, 25, 2017, from http://www.kiltas. com.tr
• Balat M, Balat M, Kırtay E & Balat H (2009). Main routes for the thermo-conversion of biomass into fuels and chemicals. Part 2: Gasification systems. Energy Conversion and Management 50(12): 3158-3168
• Basu P (2013). Biomass gasification, pyrolysis and torrefaction: Practical design and theory. Academic press. ISBN 978-0-12-396488
• Demirbas A (2004). Combustion characteristics of different biomass fuels. Progress in Energy and Combustion Science 30(2): 219-230
• Jain A K (2006). Design parameters for a rice husk throatless gasifier. Agricultural Engineering International: The CIGR Ejournal 8: Manuscript EE 05 012
• Jain A K & Goss J R (2000). Determination of reactor scaling factors for throatless rice husk gasifier. Biomass and Bioenergy 18(3): 249-256
• Lin S K, Wang H P, Lin C J & Juch C (1998). A process development for gasification of rice husk. Fuel Processing Technology 55(3): 185-192
• Ma Z, Zhang Y, Zhang Q, Qu Y, Zhou J & Qin H (2012). Design and experimental investigation of a 190 kW e biomass fixed bed gasification and polygeneration pilot plant using a double air stage downdraft approach.
• Energy 46(1): 140-147 Manguiat N A S, Marco O C, Miranda C M N, Moren K O & Magnaye R L R R C (2015). Design and development of a wood-fired gasifier prototype for synthesis gas production and analysis. Asia Pacific Journal of Multidisciplinary Research 3(5): 160-166
• Mondal P, Dang G S & Garg M O (2011). Syngas production through gasification and cleanup for downstream applications-recent developments. Fuel Processing Technology 92(8): 1395-1410
• Nwokolo N, Mamphweli S & Makaka G (2016). An investigation into heat recovery from the surface of a cyclone dust collector attached to a downdraft biomass gasifier. Applied Thermal Engineering 98: 1158-1164
• Patra T K & Sheth P N (2015). Biomass gasification models for downdraft gasifier: A state-of-the-art review. Renewable and Sustainable Energy Reviews 50: 583-593
• Reed T B & Das A (1988). Handbook of Biomass Downdraft Gasifier Engine Systems. Solar Technical Information Program Operated for U.S. Energy Department, Colorado
• Striūgas N, Zakarauskas K, Džiugys A, Navakas R & Paulauskas R (2014). An evaluation of performance of automatically operated multi-fuel downdraft gasifier for energy production. Applied Thermal Engineering 73(1): 1151-1159
• Tiangco V M, Jenkins B M & Goss J R (1996). Optimum specific gasification rate for static bed rice hull gasifiers. Biomass and Bioenergy 11(1): 51-62 Waldheim L & Nilsson T (2001). Heating value of gases from biomass gasification. Report prepared for: IEA Bioenergy Agreement, Task 20-Thermal Gasification Process. Report no TPS-01/16 TPS Termiska Processer AB, Studsvik, 611 82
• Nyköping Yoon S J, Son Y, Kim Y K & Lee J G (2012). Gasification and power generation characteristics of rice husk and rice husk pellet using a downdraft fixed-bed gasifier. Renewable Energy 42: 163-167
• Zhang Y, Zhao Y, Gao X, Li B & Huang J (2015). Energy and exergy analyses of syngas produced from rice husk gasification in an entrained flow reactor. Journal of Cleaner Production 95: 273-280
• Zhu X & Venderbosch R (2005). A correlation between stochiometrical ratio of fuel and its higher heating value. Fuel 84(7): 1007-101