The Physical Characteristics of Bio-Oil from Fast Pyrolysis of Rice Straw

Author:

Yang Shou Yin1,Wu Chih Yung2,Chen Kun Ho2

Affiliation:

1. National Formosa University

2. Kao Yuan University

Abstract

Rice straw is one of the main renewable energy sources in central and south Taiwan. In this study, bio-oil was produced from rice straw using a bench-scale plant that included a fluidized bed, a char removal system, and an oil collection system using an oil-recycling spray condenser. We investigated the effects of pyrolysis temperature and carrier gas flow rate on the distribution of products and on the properties of the bio-oil obtained. Experiments were conducted at reactor temperatures of 350–500 °C with carrier gas flow rates of 7.5–15 L/min and a feed rate of 1 kg/h. The results indicated that the optimum reaction temperature and carrier gas flow rate for the production of bio-oil were 450 °C and 10 L/min, respectively. The highest percentage of bio-oil in the products in these experiments was 41.3 wt%. The pH value of the bio-oil was ~4.1 and the viscosity was ~9 cSt (at 25 °C), depending on the storage time, temperature, and char content. This study establishes the operating parameters of a biomass fast pyrolysis system and provides some properties of rice straw bio-oil relevant to storage and use.

Publisher

Trans Tech Publications, Ltd.

Subject

General Engineering

Reference11 articles.

1. International Energy Agency: http: /www. iea. org.

2. A. Pütün, E. Apaydin, and E. Pütün: Energy, Vol. 29 (2004), p.2171–2180.

3. D. L. Klass: Biomass for Renewable Energy, Fuel, and Chemicals, Academic Press, San Diego, CA (1998).

4. A. Demirbas: Energy Convers. Manag., Vol. 42 (2001), p.1357–1378.

5. P. McKendry: Bioresour. Technol., Vol. 83 (2002), p.37–46.

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