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Parametric study and exergy analysis of the gasification of sugarcane bagasse in a pressurized circulating fluidized bed gasifier

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Abstract

The present work is to study the effect of pressure on the gasification of sugarcane bagasse in a pressurized circulating fluidized bed reactor. The range of operating pressure is maintained at 1–4 bar, and thereby the composition of generated syngas is measured with the help of gas chromatography. The gasification parameters like dry gas yield, lower heating value (LHV), cold gas efficiency (CGE), and carbon conversion efficiency (CCE) have been calculated from the syngas composition. The output yields some interesting results, i.e., with the increase in pressure from 1 to 4 bar, and there is an increment of concentration value by 26% for CH4 as well as CO2. However, a decreasing trend of H2 concentration (7.62–6.75% by volume) is observed for the same pressure rise. In addition, it has been observed a little deviation in the trend for CO (16.39–16.86%), which bears an increasing trend from a pressure of 1–2 bar and a decreasing trend thereafter. Following a similar trend for CO, the LHV first increases from 4013 to 4200 kJ Nm−3 with an increase in pressure from 1 to 2 bar and thereafter decreases gradually to 4081 kJ Nm−3 at a pressure of 4 bar. Apart from these parameters, gas yield, CCE, and CGE values imparted positive effects with pressure rise, and the magnitudes increased from 0.93 to 1.27 Nm3 kg−1, 38.3–57.5 and 23.3–32.3%, respectively, with an increase in pressure from 1 to 4 bar. The exergy destruction and exergy efficiency are observed to be 140 MW and 76% at 4 bar operating pressure.

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Abbreviations

H2 :

Concentration of hydrogen in the syngas

N2 :

Concentration of nitrogen in the syngas

C:

Content of carbon in the feed material

CO:

Concentration of carbon monoxide in the syngas

CO2 :

Concentration of carbon dioxide in the syngas

CH4 :

Concentration of methane in the syngas

CmHn :

Concentration of higher hydrocarbon in the syngas

c p :

Constant pressure specific heat capacity (kJ kmol−1 K−1)

ER:

Equivalence ratio

h :

Specific enthalpy (kJ kmol−1)

X ash :

Ash content of the feed material

Y :

Dry gas yield (Nm3 kg−1)

Q a :

Mass flow rate of air (Nm3 h−1)

M b :

Mass flow rate of feed material (kg h−1)

LHV:

Lower heating value (kJ Nm−3)

HHV:

Higher heating value (kJ Nm−3)

\( {\dot{\text{E}}\text{n}} \) :

Energy rate (MW)

\( {\dot{\text{E}}\text{x}}_{{{\text{feed}}\,{\text{material}}}} \) :

Exergy of feed material

\( {\dot{\text{E}}\text{x}}_{\text{air}} \) :

Exergy of the fluidization air

\( {\dot{\text{E}}\text{x}}_{{{\text{heat}}\,{\text{input}}}} \) :

Exergy of the electrical heat input

\( {\dot{\text{E}}\text{x}}_{\text{Syngas}} \) :

Exergy of the syngas

\( {\dot{\text{E}}\text{x}}_{\text{Char}} \) :

Exergy of the char

\( {\dot{\text{E}}\text{x}}_{\text{tar}} \) :

Exergy of the tar

\( \dot{I}_{\text{gasifier}} \) :

Irreversibility of the gasifier

β :

Quality of feed material

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Authors and Affiliations

  1. Department of Mechanical Engineering, IIT Guwahati, Guwahati, 781039, India

    Abinash Mahapatro & Pinakeswar Mahanta

  2. Department of Mechanical Engineering, NIT Arunachal Pradesh, Yupia, 791112, India

    Alok Kumar & Pinakeswar Mahanta

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  1. Abinash Mahapatro
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Correspondence to Abinash Mahapatro.

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Mahapatro, A., Kumar, A. & Mahanta, P. Parametric study and exergy analysis of the gasification of sugarcane bagasse in a pressurized circulating fluidized bed gasifier. J Therm Anal Calorim 141, 2635–2645 (2020). https://doi.org/10.1007/s10973-020-10108-z

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