Influence of the kinetic scheme and heat balance on the modelling of biomass combustion in a conical spouted bed

Use of Biochar from Rice Husk Pyrolysis: Part A: Recovery as an Adsorbent in the Removal of Emerging Compounds

“…To study the different types of biochars obtained, and based on previous experience, ,,, rice husk was used because of its physicochemical properties. The moisture contents of the four biochars were measured (according to the ISO 589 standard and by means of a halogen moisture analyzer HR83, Mettler Toledo), and the following analyses were done: proximate analysis (in a TA Instruments Discovery 5500 TGA according to the ASTM D5142 standard), ultimate analysis (Vario–Macro of Elementar, according to the ASTM D5373 and ISO 19579 standards), and HHV (Parr 6200 isoperibolic bomb calorimeter following the ASTM D5865 standard).…”

“…Rice husk can be converted into energy through different processes such as combustion, pyrolysis, or gasification. Of these, pyrolysis is the most promising for rice husks because it has been shown to have high yields in the production of liquids fuel (called bio-oil), − gases, and solid (biochar). ,, The bio-oil obtained from pyrolysis has been widely investigated due to its potential use as a second-generation biofuel (after the upgrading process) or as a starting material for chemical compounds. , The biochar produced comprises typically about 15 wt % of the products, and it is used mainly as a product for the heat treatment process by combustion or it can be separated. It has also received attention in environmental restoration due to its ability to fix carbon and improve soil fertility. , At present, the biochar that comes mainly from wood chips, crop stalks, animal carcasses, manure, sludge, and leaves − is characterized by its high carbon content.…”

Use of biochar from rice husk pyrolysis: assessment of reactivity in lime pastes

“…Biochar has unique properties such as porous structure, large specific surface area, complex surface groups, and stable chemical properties [ 1 , 2 ]. Biochar comes from the pyrolysis process, in which the volatile matter, constituted mainly by hemicellulose, cellulose, and polysaccharides, is mostly eliminated, and its degradation depends on the temperatures of the process [ 3 , 4 , 5 , 6 , 7 , 8 ]; making the biochar mainly composed of lignin. Biochar has been found to be the only one subproduct among the thermal technologies that can provide the potential to address some problems that happen in the cement industry, such as the reduction of CO 2 emissions in the world [ 9 ].…”

Mathematical Modeling and Pointwise Validation of a Spouted Bed Using an Enhanced Bed Elasticity Approach

“…Since the early development of spouted beds in 1954 [1,2], these gas-solid contactors have been widely used for several industrial application-such as fast catalytic reactions, gasification, catalytic polymerization, pyrolysis, coating, drying, and granulation [3][4][5][6][7]-due to their enhanced efficiency in gas-solid contact and efficient handling of coarse solid particles, when compared with fluidized beds [3,8]. In the last decades, vast studies have been conducted to gain a deeper insight into the two-phase flow phenomena and the kinetic throughput of these systems, in order to advance the knowledge for troubleshooting, design, and scale-up tasks [7,9].…”