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4. Production of clean synthetic gas from palm shell in a fixed bed gasifier with recycle system of producer gas

Author

Pranolo Sunu Herwi, Khoir Muhammad Tasmiul, and Pradhana Muhammad Fahreza

Subjects
Engineering (General). Civil engineering (General), TA1-2040
Abstract

Tar as side product of biomass gasification could potentially degrade internal combustion engine performance if syngas is used for the fuel. Tar reduction may be achievable with recycling of outlet producer gas back into the gasifier. This research studied the effects of recycle system to tar content in syngas as product of palm shell gasification in a fixed bed gasifier. The effects of recycling system were examined using gasification of palm shell with primary air at 3.30 Nm3/h, mixture of primary air at 1.80 Nm3/h and secondary air at 1.50 Nm3/h, and mixture of primary air and recycled gas. Volumetric rate of recycle gas were varied at 0.90 and 1.20 Nm3/h respectively. Gasification performance evaluation was based on Specific Gasification Rate. Syngas quality was rated with tar content, CO, CH4, H2, CO2, and N2 composition. The highest Specific Gasification Rate of 111.71 kg/m2h and tar reduction up to 61.95% were achieved using recycle system at volumetric rate of 0.90 Nm3/h with temperature of operation is 750°C. The highest heating value of 6.34 MJ/Nm3 was attained using recycled gas volumetric rate at 1.20 Nm3/h.

Published
2018
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8. Application of Recycle System on a Cocoa Pod Husks Gasification in a Fixed-Bed Downdraft Gasifier to Produce Low Tar Fuel Gas

Author

The Fundamental Research Program of PNBP Funds (Contract Number: 543/UN27.21/PP/2018), Pranolo, Sunu Herwi, Waluyo, Joko, Prasetiyo, Jenni, Hanif, Muhammad Ibrahim, The Fundamental Research Program of PNBP Funds (Contract Number: 543/UN27.21/PP/2018), Pranolo, Sunu Herwi, Waluyo, Joko, Prasetiyo, Jenni, and Hanif, Muhammad Ibrahim

Abstract

Biomass gasification is potentially generating not only producer gas but also tarry components. Practically, the gas may substitute traditional fuel in an internal combustion engine after reducing the tar. This research examined a producer gas recycle system to reduce tar component of producer gas generated with cocoa pod husks gasification using air as gasifying agent in a fixed-bed downdraft gasifier. Cocoa pod husks feed sizes were +1” sieve, -1”+ 0.5” sieve, and -0.5” sieve. The gasification process was operated at the temperature range of 491 – 940oC and at various gasifying agent volumetric rates of 62.84; 125,68; and 188.53 NL/min or at equivalent ratio range of 0.014 – 0.042. A recycle system of outlet producer gas to gasifier was set at volumetric rates of 0.139; 0.196; and 0.240 L/min. The performance of the system was evaluated with analyzing the tar component using gravimetric method of ASTM D5068-13, and the gas component of CO, H2, CO2 and CH4 compositions in producer gas were analyzed using Gas Chromatography GC-2014 Shimadzu sensor TCD-14. This recycle system succeeded in reducing tar content as much as 97.19% at 0.139 L/min of recycle volumetric rate and at biomass feed size of -1”+0.5” sieve. The producer gas contained CO, H2, CO2 and CH4 of 23.29%, 2.66%, 13.30%, and 14.18% respectively. The recycle system cold gas efficiency was observed 65.24% at gasifying agent volumetric rate of 188.53 L/min and at biomass feed size of +1” sieve.

Published
2019

11. Modeling and Simulation of a Separate Line Calciner Fueled with a Mixture of Coal and Rice Husk

Author

Pranolo, Sunu Herwi, Bindar, Yazid, Sasongko, Dwiwahju, and Susanto, Herri

Subjects
calcination, coal, rice husk, co-combustion
Abstract

A model has been made to predict performance of a calciner in a cement plant for the use of rice husk as partial substitution of coal. The calciner was assumed as a plug flow reactor with no-mass and heat transfer limitations. The model was composed of three equations of calcination, coal and rice husk combustions with kinetic parameters obtained from literature. Two of 20 sets of operation data were used as base-lines for simulations, namely: Case-A from operation at a capacity of 532 ton h-1 of kiln feed (KF) with coal as a fuel; and Case-B at 530 ton h-1 with 20% rice husk in a mixed fuel. Two simulations were executed at constant total fuel mass flow-rate (21.94 ton h-1 of Case-A and 27.39 ton h-1 of Case-B) and at constant total energy supplied (0.946 and 1.188 GJ ton-1 KF for Case-A and Case-B respectively). Our simulation showed that a target CaCO3 conversion could be obtained using mixed fuel with maintaining constant total energy supplied instead of constant total fuel mass flow-rate. In Case-A as base-line, the use of mixed fuel with 20% rice husk with maintaining constant supplied energy would give a coal saving of 11.8%. This operation however would require an increase in specific fuel consumption from 0.0412 to 0.0455 ton ton-1 of KF. In Case-B as base-line, the CaCO3 conversion of 95% could be obtained with a mixed fuel with rice husk mass fraction up to 40%.

Published
2010

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