Thermo‐physical and kinetics parameters determination and gases emissions of self‐ignition of sieved rice husk of different sizes on a hot plate

Abstract

Hot plate self-ignition standard tests at constant temperature have been performed on a paddle rice husk of size 75 to 1500 μm and a sieved rice husk of sizes 75 : 106, 106 : 120, and 120 : 150 μm. Modified tests using insulated metal ring have been investigated and compared with the standard test. Gases emissions showed that CO is the main component, and its maximum percentage occurs at the maximum temperature and depends on the dust layer thickness. It was found that as the thickness of dust layer increases, the maximum temperature and its corresponding time increase. Ring with insulation showed lower maximum and ignition temperature and ignition time compared with that without insulation. The flue gases temperature and CO% and CO 2 % emissions were higher in case of insulated ring. Thermal and physical properties as density, thermal conductivity, heat transfer coefficient, and kinetic parameters as activation energy and frequency factor have been determined. The activation energy of the sieved husk (75 : 106, 106 : 120, 120 : 150 μm) and paddle husk was 174. 76, 183.37, 189.1, and 206.1 kJ/mol, respectively. Also, (QA 0 ) factors were 2.696 × 10 14 , 6.211 × 10 16 , 6.105 × 10 19 and 3.0461 × 10 16 (J/kg s), respectively. It has been noted that as the dust particle size increases, the (E) and (QA 0 ) values increase.

The Flame-Retardant Mechanisms and Preparation of Polymer Composites and Their Potential Application in Construction Engineering

“…In addition, Saad’s group also studied some parameters of rice husk smoldering behavior, including initial temperature, particle size and gas products. By investigating the free diffusion of the rice fuel bed during convective heating, they observed the transformation from smoldering to open flame combustion [ 135 ]. Ying et al [ 136 ] also studied the preparation of straw magnesium cement (SMC) from rice straw, another bio-based isolation material.…”

Bio-based materials for fire-retardant application in construction products: a review

“…Moreover, some parameters on smoldering behavior of rice husk containing initiation temperature, particle size, and gas products were also studied by Saad group [119,120].…”