A new approach to design a commercial-scale bubbling fluidisedbed gasifier to gasify char derived from a gasification plant

  • Nguyen Van Luc Technical Instrument and Consultant Technology JSC
  • Le Dinh Chien University of Mining and Geology
Keywords: Design, char, gasification, fluidised-bed, biomass, Refgas

Abstract

To maximise energy recovery, a methodology for designing a bubbling fluidised-bed gasifier to gasify the char was established based on a combination of experimental kinetic data of gasification reactions on the char particles and the residence-time-design method to determine the bed height. The principal parameters of the fuidised-bed gasifier for char gasification reaction drawn from previous researches and the results collected when using the method proposed in the current research at the same input flowrate are quite similar. However, this method is not suitable to calculate and design fluidised-bed gasifier with diameter of less than 0.2 m. For pilot-scale or full-scale fluidised-bed gasifier (with diameter of over 0.2 m), this method can design the principal parameters of the equipment more easily and quicker than previous methods with a similar level of accuracy. For a flowrate of 500 kg char per hour, a bubbling fluidised-bed gasifier with height of 5.2 m and diameter of 1.22 m was chosen, with a power output of 3,359.52 kW (~ 74.83% ) at an operating condition of 850 oC and atmospheric pressure. The obtained energy value can be used to generate electricity to increase the overall efficiency of a biomass gasification process.

References

J.J.Ramírez, J.D.Martínez, S.L.Petro. Basic design of a fluidized bed gasifier for rice husk on a pilot scale. Latin American Applied Research. 2007; 37(4): p. 299 - 306.

Harish Jagat Pant, V.K.Sharma, M.Vidya Kamudu, S.G.Prakash, S.Krishanamoorthy, G.Anandam, P.Seshubabu Rao, N.V.S.Ramani, Gursharan Singh, R.R.Sonde. Investigation of flow behaviour of coal particles in a pilotscale fluidized bed gasifier (FBG) using radiotracer technique. Applied Radiation and Isotopes. 2009; 67(9): p. 1609 - 1615.

Fudong Ju, Hanping Chen, Haiping Yang, Xianhua Wang, Shihong Zhang, Dechang Liu. Experimental study of a commercial circulated fluidized bed coal gasifier. Fuel Processing Technology. 2010; 91(8): p. 818 - 822.

Le Dinh Chien. Gasifi cation of biomass: An investigation of key challenges to advance acceptance of the technology. PhD thesis, University of Bath, United Kingdom. 2012.

Refgas. www.refgas-uk.com.

S.Septien, F.J.Escudero Sanz, S.Salvador, S.Valin. Steam gasification of char from wood chips fast pyrolysis: Development of a semi-empirical model for a fluidized bedreactor application. Biomass and Bioenergy. 2015; 77: p. 64 - 74.

Prabir Basu. Biomass gasification and pyrolysis: Practical design and theory. 2010.

CARBO Ceramics Inc. www.carboceramics.com.

D.Kunii, O.Levenspiel. Fluidization engineering (2nd edition). Butterworth-Heinemann. 1991.

Trần Xoa, Nguyễn Trọng Khuông, Hồ Lê Viên. Sổ tay quá trình và thiết bị công nghệ hóa chất (Tập 1). Nhà xuất bản Khoa học và Kỹ thuật.

Byungho Song, Xueyan Zhu, Woongsig Moon, WonYang. Steam gasification of low rank coal chars in a thermobalance reactor and a fluidized bed reactor. 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering, Gyeong-ju, Korea. 16 - 21 May, 2010.

Colomba Di Blasi. Combustion and gasification rates of lignocellulosic chars. Progress in Energy and Combustion Science. 2009; 35(2): p. 121 - 140.

Chiều cao của thiết bị tầng sôi: Hbed là chiều cao đệm, Hf là chiều cao khoảng không bên trên đệm, TDH là chiều cao tới hạn thu hồi chất rắn, Dt là đường kính trong của thiết bị
Published
2015-12-27
How to Cite
Nguyen, V. L., & Le, D. C. (2015). A new approach to design a commercial-scale bubbling fluidisedbed gasifier to gasify char derived from a gasification plant. Petrovietnam Journal, 12, 38 - 44. Retrieved from http://tapchidaukhi.vn/index.php/TCDK/article/view/743
Section
Articles