Co-Combustion Mechanism Analysis of Oil Shale Semi-Coke and Rice Straws Blends

2012 ◽  
Vol 614-615 ◽  
pp. 45-48
Author(s):  
Qing Wang ◽  
Xu Dong Wang ◽  
Hong Peng Liu ◽  
Chun Xia Jia
Keyword(s):  
Oil Shale ◽  
Combustion Process ◽  
Reaction Model ◽  
Volatile Matter ◽  
Combustion Characteristic ◽  
Biomass Combustion ◽  
Combustion Mechanism ◽  
Mechanism Analysis ◽  
Heating Rates ◽  
Kinetics Parameters

In this work, a series of combustion experiments for oil shale semi-coke , rice straws as well as their mixture were conducted by the thermogravimetric analyzer at different heating rates (10, 20 and 50 K/min) under atmospheric pressure. Combustion characteristic curves and combustion characteristic parameters were acquired. The results showed that the combustion process of blends can be broadly separated into three stages: combustion of the volatile matter, combustion of fixed carbon and combustion of difficult decomposition substance. The point of ignition and burnout shifted to higher temperature with increasing the heating rates. Furthermore, kinetics parameters were analyzed in the second stage. The result showed feasibility of using the reaction model to solve the kinetic parameters of biomass combustion. Finally, the obtained DTG curves were separated by Gaussian Fitting method. The result showed that the derivative thermogravimetry (DTG) curve displays an overlapping peak consisted of three sub-peaks at 645–900K under heating rate of 20K/min.

scholarly journals Characteristics of Woody Cutting Waste Briquette with Paper Waste Pulp as Binder

2020 ◽  
Vol 190 ◽  
pp. 00030
Author(s):  
Qurrotin Ayunina Maulida Okta Arifianti ◽  
Azmi Alvian Gabriel ◽  
Syarif Hidayatulloh ◽  
Kuntum Khoiro Ummatin
Keyword(s):  
Moisture Content ◽  
Ignition Time ◽  
Combustion Process ◽  
Calorific Value ◽  
Volatile Matter ◽  
Proximate Analysis ◽  
Hydraulic Press ◽  
Combustion Characteristic ◽  
Paper Waste ◽  
Iron Mold

The current research aimed to increase the calorific value of woody cutting waste briquette with paper waste pulp as binder. There were three different binder variation used in this study, they are 5 %, 10 %, and 15 %. To create a briquette, a cylindrical iron mold with diameter of 3.5 cm and height of 3 cm and a hydraulic press with 2 t power were applied. The physical characteristics of the combination woody waste briquette and paper waste pulp, such as moisture content, ash content, volatile matter and carbon fix were examined using proximate analysis. The calorific value of briquetted fuel was tested by bomb calorimeter. The combustion test was performed to determine the combustion characteristic of briquettes, for example initial ignition time, temperature distribution, and combustion process duration. The general result shows that the calorific value of briquette stood in the range of 4 876 kCal kg–1 to 4 993 kCal kg–1. The maximum moisture content of briquette was 5.32 %. The longest burning time was 105 min.

scholarly journals Thermogravimetric Analysis and Kinetics of Mixed Combustion of Waste Plastics and Semicoke

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Xiangdong Xing ◽  
Sha Wang ◽  
Qiuli Zhang
Keyword(s):  
Heating Rate ◽  
Combustion Process ◽  
Calculated Data ◽  
Preexponential Factor ◽  
Combustion Characteristic ◽  
Waste Plastics ◽  
Heating Rates ◽  
Characteristic Index ◽  
Carbon Combustion ◽  
Parallel Reactions

The thermogravimetric method was applied to study the combustion characteristics of waste plastics and semicoke mixture at different heating rates with temperature ranging from room temperature to 1173 K. Also, the kinetic parameters of combustion process were also estimated by fitting the experimental data to the calculated data. The results showed that the mixed combustion process of waste plastics and semicoke could be divided into volatile combustion stage and fixed carbon combustion stage. The addition of waste plastics could increase the comprehensive combustion characteristic index (S) and flammability index (C). It showed synergistic effect in the mixed combustion process. When the additive amount of waste plastics was 60%, the S value and C value reached peak point at the heating rate of 20 K/min. The heating rate had a promotion effect on combustion rate. The mixed combustion process of waste plastics and semicoke could be well simulated by the n-order rate model of double parallel reactions. The activation energies E in the first stage of combustion of the mixture were higher than that in the second stage, and the preexponential factor k was opposite. Meanwhile, a marked kinetic compensation effect was presented between the activation energy and the preexponential factor.

scholarly journals Influence of Thermal and Morphological Behaviour on Biomass Waste Materials during Pyrolysis

2021 ◽  
Vol 321 ◽  
pp. 01005
Author(s):  
Swapan Suman ◽  
Santosh Kumar Rai ◽  
Anand Mohan Yadav ◽  
Awani Bhushan ◽  
Nomendra Tomar ◽  
...  
Keyword(s):  
Reaction Model ◽  
Heating Rates ◽  
Nitrogen Gas ◽  
Thermo Gravimetric ◽  
Sem Images ◽  
Biomass Waste ◽  
Kinetics Parameters ◽  
Biomass Feedstocks ◽  
Different Types ◽  
Pyrolysis Of Biomass

Aim of this study to investigate the thermal and morphological behaviour of different types of biomass feedstock. For investigation of thermal behaviour we used thermo-gravimetric (TG) analysis and derivative thermo-gravimetric (DTG) analysis. The biomass feedstocks were conceded out under vigorous conditions using nitrogen gas at specific heating rates to gradient the temperature from 25°C to 1000°C. The derivative thermo-gravimetric (DTG) results show that thermal decomposition on these feedstocks. First-order reaction model were used to determine the kinetics parameters for the pyrolysis of biomass wastes. This study used Field Emission Scanning Electron Microscopy (FE-SEM) to observe surface morphology properties of the different biomass wastes. The FE-SEM images showed that clearly retained the fibrous structures in the biomass wastes and were rich in macro-pores.

The Kinetic Analysis of Biomass Burning Based on Two-Component Reaction Model

2012 ◽  
Vol 424-425 ◽  
pp. 1301-1304
Author(s):  
Hong Bo Lu ◽  
Ze Hui Wang ◽  
Yu Xin Ma
Keyword(s):  
Kinetic Analysis ◽  
Heating Rate ◽  
Biomass Burning ◽  
Combustion Process ◽  
Reaction Model ◽  
Experimental Results ◽  
Parallel Reaction ◽  
Heating Rates ◽  
Two Component ◽  
Good Agreement

Combustion of sawdust was studied using Pyris-1TGA thermogravimetric apparatus in the heating rates of 20, 40, 60K/min. The combustion process of sawdust includes three steps: losing water, precipitation and combustion of volatile, and carburization. A bicomponent parallel reaction model is created and used to simulate the combustion process of sawdust under the heating rate of 40K/min. Comparison of simulation and experimental results shows that the fitting curves are in good agreement with the experimental results

scholarly journals Investigation of pyrolysis kinetics parameters and thermal behavior of thermochemically modified bagasse for bioenergy potential

2021 ◽  
Vol 3 (3) ◽  
Author(s):  
Christiano Bruneli Peres ◽  
André Henrique Rosa ◽  
Leandro Cardoso de Morais
Keyword(s):  
Sugarcane Bagasse ◽  
Volatile Matter ◽  
Pyrolysis Kinetics ◽  
Heating Rates ◽  
Kinetics Parameters ◽  
Exponential Factor ◽  
Other Substances ◽  
Textural Parameters ◽  
Three Stages ◽  
Morphological Differences

AbstractBiomass is considering a source of organic carbon, which can replace fossil resources by using pyrolysis process, therefore an efficient biomass thermal modification technology has been target of so much research. The objective of this work is to study the potential energy of sugarcane bagasse and thermochemically modified bagasse for bioenergy potential for use in heat generation and energy. The thermal analysis was conducted by powder-shaped exposure of the three study samples (SB, AC-1, and AC-2) at three heating rates of (5, 7.5 and 10 °C min−1), it was possible to identify three stages of thermal degradation and study some thermochemical reactions, using two iso-conversional models, Kissinger–Akahira–Sunose (KAS) and Ozawa–Flynn–Wall (OFW) to calculate some kinetic parameters, such as activation energy (Ea) and pre-exponential factor (A). First step was about the devolatilization of volatile matter, moisture, and other substances. Degradation of hemicellulose, cellulose and lignin were shown in a second step. Characterization analyzes, such as SEM–EDX and textural parameters of the samples, show the presence of carbon in samples SB and AC-1. Due to SEM analyzes, morphological differences between the samples are showing as AC-1 and AC-2 samples present a rougher shape with pores, on the other hand, SB sample show a fibrous shape. In conclusion, sugarcane bagasse and thermochemically modified bagasse, show very promising results, for future studies, such as for bioenergy potential.

Study on Co-Combustion of Oil Shale Semi-Coke and Corn Stalk

2012 ◽  
Vol 614-615 ◽  
pp. 103-106
Author(s):  
Hong Peng Liu ◽  
Wei Yi Li ◽  
Xu Dong Wang ◽  
Hao Xu ◽  
Guan Yi Chen ◽  
...  
Keyword(s):  
Activation Energy ◽  
High Temperature ◽  
Low Temperature ◽  
Oil Shale ◽  
Combustion Process ◽  
Combustion Characteristics ◽  
Corn Stalk ◽  
Kinetics Parameters ◽  
High Temperature Stage ◽  
Blend Ratios

Co-combustion experiment of oil shale semi-coke and corn stalk at different blend ratios was performed using thermogravimetric analyzer. The influence of different blend ratios has been studied. The combustion characteristics are obtained under the heating rates of 20oC/min and the experimental temperature range of 40-850oC. The combustion process of the blends is divided into three stages: low-temperature stage, transition stage and high-temperature stage. With the increasing of corn stalk in the blends, the reaction of combustion mainly shifts from high-temperature stage to low-temperature stage, and there is no obvious change for the ignition temperature, but the burn out temperature comes down. The combustion kinetics parameters of the blends were analyzed using Flynn-Wall-Ozawa model. The result shows that the activation energy of the volatile matter stage increases and the activation energy of semi-coke combustion stage decreases. The combustion characteristics of the oil shale semi-coke get improved significantly with the mixture of corn stalk.

scholarly journals A Comparison of Combustion Properties in Biomass–Coal Blends Using Characteristic and Kinetic Analyses

2021 ◽  
Vol 18 (24) ◽  
pp. 12980
Author(s):  
Yalin Wang ◽  
Beibei Yan ◽  
Yu Wang ◽  
Jiahao Zhang ◽  
Xiaozhong Chen ◽  
...  
Keyword(s):  
Raw Materials ◽  
Thermal Reaction ◽  
Biomass Combustion ◽  
Test Results ◽  
Corn Straw ◽  
Heating Rates ◽  
Kinetics Parameters ◽  
Combustion Properties ◽  
Fwo Method ◽  
Better Than

This paper presents comparative research on the combustion of coal, wheat, corn straw (CS), beet residues after extracting sugar (BR), and their blends, coal–corn straw blends (CCSBs), coal–wheat blends (CWBs), and coal–beet residue blends (CBRBs), using thermogravimetric (TG) analysis under 10, 20, 30, 40 and 50 °C/min. The test results indicate that CS and wheat show better combustion properties than BR, which are recommended to be used in biomass combustion. Under the heating rate of 20 °C/min, the coal has the longest thermal reaction time when compared with 10 and 30 °C/min. Adding coal to the biomass can improve the burnout level of biomass materials (BM), reduce the burning speed, and make the reaction more thorough. The authors employed the Flynn–Wall–Ozawa (FWO) method and the Kissinger–Akahira–Sunose (KAS) method to calculate kinetics parameters. It was proven that overall, the FWO method is better than the KAS method for coal, BM, and coal–biomass blends (CBBs), as it provides higher correlations in this study. It is shown that adding coal to wheat and BR decreases the activation energy and makes conversion more stable under particular α. The authors selected a wider range of biomass raw materials, made more kinds of CBB, and conducted more studies on different heating rates. This research can provide useful insights into how to choose agricultural residuals and how to use them.

scholarly journals In-situ Combustion Simulation from Laboratory to Field Scale

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Zhouyuan Zhu ◽  
Canhua Liu ◽  
Yajing Chen ◽  
Yuning Gong ◽  
Yang Song ◽  
...  
Keyword(s):  
Combustion Process ◽  
Reaction Model ◽  
Field Scale ◽  
Arrhenius Kinetics ◽  
Kinetics Parameters ◽  
In Situ Combustion ◽  
Temperature Oxidation ◽  
Reservoir Volume ◽  
Combustion Simulation

In-situ combustion simulation from laboratory to field scale has always been challenging, due to difficulties in deciding the reaction model and Arrhenius kinetics parameters, together with erroneous results observed in simulations when using large-sized grid blocks. We present a workflow of successful simulation of heavy oil in-situ combustion process from laboratory to field scale. We choose the ongoing PetroChina Liaohe D block in-situ combustion project as a case of study. First, we conduct kinetic cell (ramped temperature oxidation) experiments, establish a suitable kinetic reaction model, and perform corresponding history match to obtain Arrhenius kinetics parameters. Second, combustion tube experiments are conducted and history matched to further determine other simulation parameters and to determine the fuel amount per unit reservoir volume. Third, we upscale the Arrhenius kinetics to the upscaled reaction model for field-scale simulations. The upscaled reaction model shows consistent results with different grid sizes. Finally, field-scale simulation forecast is conducted for the D block in-situ combustion process using computationally affordable grid sizes. In conclusion, this work demonstrates the practical workflow for predictive simulation of in-situ combustion from laboratory to field scale for a major project in China.

Investigation on the Co-Combustion Characteristics of Pulverized Coal and Paper Mill Sludge

2011 ◽  
Vol 55-57 ◽  
pp. 1132-1137 ◽  
Author(s):  
Ning Zhang ◽  
Xu Nan Ning ◽  
Jian Bo Zhou ◽  
Pei Tao Wei ◽  
Hai Jian Luo
Keyword(s):  
Combustion Process ◽  
Paper Mill ◽  
Combustion Characteristics ◽  
Combustion Characteristic ◽  
Heating Rates ◽  
Paper Mill Sludge ◽  
Ignition Point ◽  
Characteristic Index ◽  
Coal Blend ◽  
Carbon Combustion

The combustion characteristics of the mixtures, which are made from different proportions of paper mill sludge and coal, were studied by the thermogravimetric analysis (TG-DTG) at different heating rates. The results showed that there were obviously three temperature zones in the paper mill sludge combustion curves, which is respectively corresponding to two devolatilization stages and a fixed carbon combustion stage. In these stages, the weight of sludge was lost promptly. When the proportions of sludge – coal blends were rather different, ignition point obviously shifted to the larger proportions, and DTG curve was more closed to the larger proportions. During the combustion process of the mixture, the paper mill sludge and the coal had basically maintained their own devolatilisation characteristics. And the comprehensive combustion characteristic index S of sludge-coal blend declined, demonstrating that higher volatility had better combustion characteristics. As the heating rate and the proportions of coal increasing, total weight loss rate increased, while burnout index Cbraised.

Combustion Characteristics of Coal and Biomass Blends with Adding Absorbing Sulfur Agent

2011 ◽  
Vol 236-238 ◽  
pp. 441-447 ◽  
Author(s):  
Hui Xin Jin ◽  
Fu Zhong Wu ◽  
Shui E Li
Keyword(s):  
Weight Loss ◽  
Combustion Process ◽  
Volatile Matter ◽  
Matter Content ◽  
Combustion Characteristics ◽  
Kinetics Parameters ◽  
Linear Temperature ◽  
Thermogravimetric Analyzer ◽  
Linear Temperature Gradient ◽  
Large Heat

The combustion characteristics of coal and biomass blends with adding adsorbing sulfur agent was investigated using thermogravimetric analyzer. The results indicated that the combustion process of the blends were similar to that of pure coal and biomass, which there were two apparent weight-loss peaks--one for volatile burning and another for char burning. The combustion stages could be divided into the dewatering period, volatilization and burning, char burning and burnout. Nevertheless, the combustion characteristics of blends varied with the biomass blending ratio and Ca/S ratio. Due to the increase of biomass blending ratio, the volatile matter content of blends increased, which leaded to the increase of peak value for volatile burning stage. In this stage, due to the lower reaction temperature, less SO2was produced and the reaction to CaO was slower. With the progress proceeding, char began to be burned and large heat was released and the adsorbing sulfur reactions were becoming stronger. Although the mass of blends reduced fastly, the mass of CaSO3and CaSO4increased compared to CaO, Which leaded to a wider temperature range of weight-loss for the char burning period. At the same linear temperature gradient, an increase of Ca/S decreased the temperature of volatilization and char burning, and the residue was increased due to more CaO additive. Therefore, the appropriate ratio of Ca/S was necessary to improve the combustion and adsorbing sulfur efficiency. In this study, a basic kinetics analysis for coal and biomass blends is provided. The kinetics parameters reveal that the combustion process of coal and biomass blends with adding absorbing sulfur agent can be described by a first order reaction equation.

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