Comparing the Thermo-Physical Properties of Rice Husk and Rice Straw as Feedstock for Thermochemical Conversion and Characterization of their Waste Ashes from Combustion

Abstract

The thermogravimetric characterization and gas emission properties during the pyrolysis of rice husk (RH) and rice straw (RS) were compared, and the properties of waste rice husk ash (RHA) and rice straw ash (RSA) from the combustion process were investigated. The results showed that the pyrolysis of RH and RS followed a four-step mechanism. Comparing the emission properties of small molecule bio-syngas in the pyrolysis of these two biomass wastes implied that RS was more suitable for use as feedstock for thermochemical conversion. Chemical and phase analysis results indicated that the RSA was rich in K, Ca, and P and had good potential for use as a soil amendment or as a material for silicate ceramics. The RHA was rich in SiO2 and could be an ideal silica source for silicon compound preparation or a pozzolan source for blended cement concrete production. Morphology analysis on the ash samples revealed that the high content of alkali metals may cause the higher agglomeration tendency of RSA with respect to RHA. The contrast in pore properties of biomass char wastes isolated from the ashes indicated that the char wastes recovered from RHA would be better used as a low-cost precursor in activated carbon production.

Assessing the Effects of Different Process Parameters on the Pyrolysis Behaviors and Thermal Dynamics of Corncob Fractions

“…A quantitative method on the MS was implemented by calibration for the following species: CO, CO2, CH4, and H2, based on the quantitative analysis on signals for their mass numbers. Details of this method can be found in a previous paper (Yao et al 2016a). The calibration is taken on the MS spectrometer directly to obtain the method file before the measurement.…”

“…The pyrolysis behaviors of a variety of agricultural wastes, such as apple pomace (Baray et al 2014), hardwood residues (Mazlan et al 2015), corn stalk (Pittman et al 2012), peanut shells (Yao et al 2016a), grape residues (Xu et al 2009), rice husk and straw (Worasuwannarak et al 2007), wheat and corn straw (Lanzetta and Di Blasi 1998), and cherry seeds (Duman et al 2011), have been investigated for different purposes. Miura and Maki (1998) and Arora et al (2009) have focused on developing mathematical dynamic models for predicting the pyrolysis characteristics of various biomass wastes.…”

Rice straw as a feedstock for biofuels: Availability, recalcitrance, and chemical properties

“…The proximate analysis of rice straw is compared with wheat straw and sugarcane bagasse (Table ). It showed that ash and silica content of rice straw is significantly higher in comparison to wheat straw and sugarcane bagasse …”

“…It showed that ash and silica content of rice straw is signifi cantly higher in comparison to wheat straw and sugarcane bagasse. [47][48][49][50][51][52][53][54]…”

Causation Analysis of Risk Coupling of Gas Explosion Accident in Chinese Underground Coal Mines

“…The serious consequences of these gas explosions resulted in the Chinese government and the coal industry establishing countermeasures. Since 2006, policies for energy conservation, emission reduction, and adjusting and upgrading infrastructure restricted the development of high coal consumption and contributed to the development of clean and renewable energy sources (Yao, Xu, & Liang, ). Simultaneously, the Chinese government and SACMS gradually improved safety regulations, strengthened enforcement, researched new technology and equipment for gas control, and closed coal mines that were unsafe.…”