Abstract
The maize cob biomass is one of important biomass crops in Thailand. Nowadays, the use of the biomass as renewable resource is increasing, especially residue agriculture waste. As we know that the biomass properties impact combustion, in order to achieve boiler efficiency, its energy characteristics of biomass was required immediately before burning. This work uses the FT-near infrared spectroscopy to estimate gross calorific value (GCV) of maize cob as the rapid method. Each sample was scanned using diffuse reflectance mode at a wavenumber range between 12500-3600 cm-1. The scanning was done with a resolution of 8 cm-1 and completed 32 scans per sample, then averaged to be one spectrum. The results showed that this technique could decrease a processing time to 1-2 minutes per sample to determine GCV whereas alternatively the current method used a processing time of 25-30 minutes per sample. The capacity of the model gave root mean square error of cross validation (RMSECV) of 91.1 Jg-1, which was low. Hence, the model was acceptable and cloud be used for screening.
Highlights
Maize cob is a waste from agricultural process after the seed is removed from the cob
The results showed that this technique could decrease a processing time to 1-2 minutes per sample to determine gross calorific value (GCV) whereas alternatively the current method used a processing time of 25-30 minutes per sample
3.2 Reference data of the GCV Statistical data of calibration set, and external sample set for GCV of rice husk was demonstrated in Table 1 which shows the maximum, minimum, average, and standard deviation (SD)
Summary
Maize cob is a waste from agricultural process after the seed is removed from the cob. Maize cob can become a habitat of bird and rat and bad smell could happen as well. This is the important problem of traders. The maize cob was used as a fertilizer but it was not popular for farmer because it takes a long time for decomposition. When the maize cob is burned, it has calorific value approximately 17,000 kJ/kg, and it takes a long time to burn before becoming the ash. This implies that it has a characteristic of good fuel
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