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.

Experimental Study on Combustion Characteristics of Biomass and Coal Blended

2013 ◽  
Vol 805-806 ◽  
pp. 200-207
Author(s):  
Bing Zhang ◽  
Guang Wu Lu
Keyword(s):  
Particle Size ◽  
Ignition Temperature ◽  
Combustion Process ◽  
Combustion Characteristics ◽  
Combustion Characteristic ◽  
Thermogravimetric Analyzer ◽  
Rate Of Combustion ◽  
Mixing Proportion ◽  
Biomass Particle Size ◽  
Obvious Weight Loss

Under different conditions,combustion characteristics of the single biomass,the single coal and the mixture of biomass and coal were analyzed by using thermogravimetric analyzer. Combustion characteristic parameters of the sawdust,the rice husk,the rice straw and the Baisha coal of Leiyang were studied,including ignition temperature,the maximum rate of combustion temperature,the burnout temperature and so on. The experimental results show that the biomass burning temperature is lower than the Baisha coal and there are two obvious weight loss phases in the combustion process of the biomass. However,there is only one in the coal. The ignition temperature and time of the coal can be reduced ,the temperature range of the entire combustion can be extended,the coal can be burnout more well and the fuel combustion characteristic can be optimized by blending combustion. With the increase of biomass mixing proportion, the ignition temperature of mixing samples was decreased more obviously. Moreover,when the biomass particle size becomes R200,compared with R90 particle size under the same blending ratio,its ignition temperature is more lower.

Experimental Study on Combustion Characteristics of Three Biomass Components

2014 ◽  
Vol 953-954 ◽  
pp. 309-312
Author(s):  
Gui Qiu Su ◽  
Jian Yang ◽  
Hong Bo Lu
Keyword(s):  
Experimental Study ◽  
Weight Loss ◽  
High Temperature ◽  
Low Temperature ◽  
Combustion Process ◽  
Combustion Characteristics ◽  
Heating Rates ◽  
Biomass Components ◽  
Coke Combustion ◽  
Obvious Weight Loss

Experiments on combustion characteristics of cellulose, xylan and lignin have been done conducted on Pyris1 TGA thermograyimetric analyzer (PE/USA) at different heating rates. The results show that: combustion of cellulose was mainly concentrated in a low temperature range, xylan has two obvious weight loss peaks, while the lignin combustion mainly concentrated in a high temperature coke combustion process.

Co-Combustion Characteristics of Oil Shale Semi-Coke and Corn Stalk

2012 ◽  
Vol 614-615 ◽  
pp. 107-110
Author(s):  
Hong Peng Liu ◽  
Xu Dong Wang ◽  
Chun Xia Jia ◽  
Wei Zhen Zhao ◽  
Qing Wang
Keyword(s):  
Weibull Distribution ◽  
Oil Shale ◽  
Combustion Process ◽  
Combustion Characteristics ◽  
Avrami Equation ◽  
Corn Stalk ◽  
Fixed Carbon ◽  
Thermogravimetric Analyzer ◽  
Blend Ratios

The combustion experiments of oil shale semi-coke and corn stalk mixtures were conducted using thermogravimetric analyzer. The results show that the advance ignition and burnout can be achieved when semi-coke is mixed with corn stalk. The influence of different blend ratios has been studied, and the combustion characteristics were obtained. Comprehensive combustion characteristics get improved with the increase of corn stalk proportion in the mixture. The interaction of mixture in the combustion process occurs mainly in 400-600oC. It can be explained that the combustion of fixed carbon in corn stalk is delayed. What is more, TG curves were simulated by Johnson-Mehl-Avrami equation. The result shows the feasibility of using Weibull distribution to simulate the TG curves of co-combustion.

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.

Performance Evaluation of Thermo Chemical Behavior of PCI Under Optimal Conditions

2018 ◽  
Vol 4 (12) ◽  
pp. 9
Author(s):  
Upendra Kumar ◽  
Avinash Patidar
Keyword(s):  
Mathematical Model ◽  
Performance Evaluation ◽  
Three Dimensional ◽  
Volatile Matter ◽  
Matter Content ◽  
Combustion Characteristics ◽  
Operating Conditions ◽  
Optimal Conditions ◽  
Chemical Behavior ◽  
Volatile Matter Content

In this study, a three-dimensional mathematical model is used to simulate the flow and thermo chemical behavior of the enhanced operation of PCI Victorian lignite under optimal FC conditions. The geometry of the model includes a lance, a blowtorch, a nozzle, a track and a coke bed at the bottom of a BF. Under the same operating conditions, the highest temperature in the main coal pavilion is observed in the brindled lignite container due to its higher volatile matter content. Injecting lignite into briquettes can achieve a higher overall combustion value than the semi-coke container and the carbon container in the ducting. The comparison confirms the possibility of replacing the replacement coal with PCI coal with an improved lignite, as it shows a very similar evolution of the combustion characteristics under the same operating conditions.

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.

EFFECT OF METALLIC FUEL NATURE ON COMBUSTION CHARACTERISTICS OF AMMONIUM PERCHLORATE / BINDER / METAL COMPOSITE SOLID PROPELLANTS

2020 ◽  
Author(s):  
V. A. Poryazov ◽  
◽  
O. G. Glotov ◽  
V. A. Arkhipov ◽  
G. S. Surodin ◽  
...  
Keyword(s):  
Ammonium Perchlorate ◽  
Combustion Process ◽  
Experimental Information ◽  
Combustion Characteristics ◽  
Transformer Oil ◽  
Metal Composite ◽  
Butadiene Rubber ◽  
Solid Propellants ◽  
Metallic Fuel ◽  
Composite Solid Propellants

The goal of this research is to obtain experimental information about combustion characteristics of the composite propellant containing various metallic fuels. The propellant formulations contained two fractions of ammonium perchlorate (64.6%), inert binder (19.7%) - butadiene rubber SKD plastized with transformer oil, and metal fuel (15.7% of aluminum ASD-4, ASD-6, Alex; boron; aluminum diboride; aluminum dodecaboride; some mixtures of above listed ingredients). Experimental information will be used further as a background to develop the physical and mathematical model of combustion process.

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