Abstract
Thermogravimetric analysis experiment to understand thermal decomposition behavior of water hyacinth during the pyrolysis has been performed. Water hyacinth was taken randomly from 2 places, i.e., Selorejo and Sengguruh Dam, district of Malang, Indonesia. Those raw materials were thoroughly cleaned by using the water, then cut and dried in an oven with a temperature range of 80-90 °C for 6 hours. Subsequently, the dried samples were crushed and then filtered to a mesh size of 60. Thermal behavior of the sample was observed through the instrumentality of thermal analyzer at a constant heating rate of 10 °C/min with a nitrogen flow rate of 100 ml/min and a temperature range of 25-1000 °C. The kinetics of active pyrolysis zone were evaluated by Coats-Redfern integral method. The thermogravimetric test results show that the water hyacinth biomass decomposed into four stages during the pyrolysis process. The kinetic parameters in term of activation energy (E), logarithmic frequency factor (log A) and reaction order (n) were 60.74 kJ/mol, 4.77/min and 1.9, respectively.
Highlights
The increased consumption of energy in Indonesia occurs annually from 2000 to 2014, except in 2005and 2006
water hyacinth (WH), which is often regarded as a weed, to be a daunting challenge to examine its practicability as an alternative energy source for future life
The thermal behavior of WH biomass was studied by using a thermal analyzer (METTLER TOLEDO TGA/DSC1) of which nitrogen carrier gas flowed at a constant rate of 100 ml/min
Summary
The increased consumption of energy in Indonesia occurs annually from 2000 to 2014, except in 2005and 2006. In Selorejo dam, Malang, East Java, Indonesia, 100 hectares of the total reservoir area of 650 hectares is covered by WH This reservoir with a maximum water capacity of 62 million m3 is used to drive a turbine’s power plant of 45 million kWh per year. Understanding the thermal behavior of biomass thoroughly during the pyrolysis conversion process is essential in order to be able to design suitable reactor and temperature control systems, resulting in optimal pyrolysis products. For this purpose, thermogravimetric (TG) analysis come to be a technique which is generally used by researchers. Estimation of kinetic parameters is conducted by using the Coats-Redfern method
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