Co-Combustion Characteristics of Semi-Coke and Coal Under Air Condition

2018 ◽  
Author(s):  
Pengqian Wang ◽  
Chang'an Wang ◽  
Zichen Tao ◽  
Maobo Yuan ◽  
Yongbo Du ◽  
...  
Keyword(s):  
Bituminous Coal ◽  
Combustion Process ◽  
Coke Coal ◽  
Interaction Coefficient ◽  
Combustion Characteristics ◽  
Linear Superposition ◽  
Combustion Behavior ◽  
Two Stages ◽  
Blended Fuels ◽  
Relative Root

In this work, the combustion characteristics of semi-coke, coal, and their blends under air conditions were studied. The influence of blending ratio on the combustion characteristics of blended fuels were investigated by thermogravimetric analysis. It was found that the co-combustion of semi-coke and bituminous coal was a complicated process rather than a simple linear superposition, with interaction effect occurring in the co-combustion process. The synergy occurred in the whole combustion process and it was analyzed quantitatively by comparing the interaction coefficient f and the relative root mean square error RMS. The combustion of semi-coke and the blends can be divided to three stages, as well as two stages of coal. In addition, the blends show better combustion behavior with enhancing bituminous coal proportion, and bituminous coal can improve the combustion behavior of semi-coke.

Oxygen-Enriched Combustion Characteristics of Solid Fuel - The Lignite

2016 ◽  
Vol 693 ◽  
pp. 594-596
Author(s):  
X.Y. Chen ◽  
Yong Feng Zhang ◽  
Q.C. Zhang ◽  
Q. Zhou
Keyword(s):  
Combustion Rate ◽  
Solid Fuel ◽  
Combustion Process ◽  
Combustion Characteristics ◽  
Thermo Gravimetric ◽  
Combustion Behavior ◽  
Thermo Gravimetric Analyzer ◽  
Combustion Tests ◽  
Application Scope

Oxygen-enriched Combustion behavior of indigenous lignite was investigated by using thermo gravimetric analyzer (TG). Combustion tests were carried out in six different atmospheres. The experiment results showed the oxygen–enriched atmosphere can improve the combustion rate of the lignite and expand the application scope of the lignite. Determine the Combustibility index to reveal the oxygen-enriched combustion process in detail.

Experimental Study on the Combustion Characteristics of Municipal Solid Waste

2011 ◽  
Vol 204-210 ◽  
pp. 1351-1356 ◽  
Author(s):  
Yong Hua Li
Keyword(s):  
Municipal Solid Waste ◽  
Solid Waste ◽  
Combustion Process ◽  
High Water ◽  
Combustion Characteristics ◽  
High Water Content ◽  
Element Analysis ◽  
Ignition Point ◽  
Heating Value ◽  
Two Stages

In China, municipal solid waste (MSW) of low heating value and high water content are always burnt in their original forms. Based on the constituent of Shijiazhuang City’s MSW, nine typical constituent of wastes were blended as actual MSW. In this paper, MSW were chosen to carry out element analysis, industrial analysis and thermogravimetric analysis. Analysis combustion characteristics of MSW and the mixture of MSW and coal adopt WCT-2 High Temperature Computer Differential Thermal Balance. The kinetic parameters of MSW and the mixture of MSW and coal were obtained through the law of Arrhenius and the thermogravimentric curve. The final result indicates that ignition point and activation energy of MSW are obviously lower than those of the coal, and the ignition point of the mixture of MSW and coal are not high. It can be combusted completely below 850°C. And the combustion process of MSW or the mixture of MSW and coal can be separate into two stages, the first stage is water in the MSW evaporated, the second stage is combustion of combustible. There are four stage of weightlessness in the combustion of combustible, it shows that there are influence between each constituent of MSW. All this will offer help for incineration MSW of low-heating-valued.

Modeling on Combustion Characteristics of Biocoalbriquettes

2000 ◽  
Vol 123 (1) ◽  
pp. 27-31 ◽  
Author(s):  
Hee-Joon Kim ◽  
Guo-Qing Lu ◽  
Ichiro Naruse ◽  
Jianwei Yuan ◽  
Kazutomo Ohtake
Keyword(s):  
Combustion Process ◽  
Reaction Model ◽  
Combustion Characteristics ◽  
Core Mode ◽  
Compression Pressure ◽  
Char Combustion ◽  
Volume Model ◽  
Shrinking Core ◽  
Two Stages ◽  
Core Reaction

A biocoalbriquette, a new artificial solid fuel, is manufactured by a mixture of coal and biomass under a high-compression pressure. The combustion characteristics of biocoalbriquettes were investigated in this study experimentally and numerically. The combustion process of biocoalbriquettes appears in two stages: the volatile combustion stage followed by the char combustion stage. It was found that the volatile combustion happens over the whole pellet of biocoalbriquette, whereas the char combustion proceeds in a shrinking-core mode. A volume model and a shrinking-core reaction model were introduced and modified here to simulate the two stages of combustion process. The simulation results are found to be consistent with the experimental results.

Effects of mustard husk, wheat straw and flaxseed residue blending on combustion behavior of high ash coal and petroleum coke blends

2022 ◽  
pp. 1-22
Author(s):  
Pritam Kumar ◽  
Barun Kumar Nandi
Keyword(s):  
Wheat Straw ◽  
Thermodynamic Parameters ◽  
Petroleum Coke ◽  
Coal Combustion ◽  
Combustion Process ◽  
Combustion Characteristics ◽  
Maximum Temperature ◽  
Combustion Behavior ◽  
Combustion Properties ◽  
The Impact

Abstract This present work reports the combustion studies of coal, petroleum coke (PC) and biomass blends to assess the effects of the mustard husk (MH), wheat straw (WS) and flaxseed residue (FR) blending towards improvement of coal combustion characteristics. Ignition temperature (TS), maximum temperature (TP), burnout temperature (TC), activation energy (AE) and thermodynamic parameters (ΔH, ΔG and ΔS) were analyzed to evaluate the impact of biomass and PC blending on coal combustion. Experimental results indicate that coal and PC have inferior combustion characteristics compared to MH, WS and FR. With the increase in WS content in blends from 10 to 30%, TS reduced from 371 to 258OC, TP decreased from 487 to 481OC, inferring substantial enhancements in combustion properties. Kinetic analysis inferred that blended fuel combustion could be explained mostly using reaction models, followed by diffusion-controlled and contracting sphere models. Overall, with the increase in FR mass in blends from 10 to 30%, AE decreased from 108.97 kJ/mol to 70.15 kJ/mol signifying ease of combustion. Analysis of synergistic effects infers that higher biomass addition improves coal and PC blends' combustion behavior through catalytic effects of alkali mineral matters present in biomass. Calculation of thermodynamic parameters signified that combustion of coal and PC is challenging than biomasses, however, blending of biomass makes the combustion process easier.

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.

An experimental study on optimal spark timing control for improved performance of a flex fuel vehicle engine

2019 ◽  
Vol 234 (5) ◽  
pp. 1294-1303
Author(s):  
Junsang Yoo ◽  
Taeyong Lee ◽  
Pyungsik Go ◽  
Yongseok Cho ◽  
Kwangsoon Choi ◽  
...  
Keyword(s):  
Empirical Equation ◽  
Interpolation Method ◽  
Linear Interpolation ◽  
Combustion Characteristics ◽  
Combustion Stability ◽  
Timing Control ◽  
Vehicle Engine ◽  
Spark Timing ◽  
Linear Interpolation Method ◽  
Blended Fuels

In the American continent, the most frequently used alternative fuel is ethanol. Especially in Brazil, various blends of gasoline–ethanol fuels are widely spread. The vehicle using blended fuel is called flexible fuel vehicle. Because of several selections for the blending ratios in gas stations, the fuel properties may vary after refueling depending on a driver’s selection. Also, the combustion characteristics of the flexible fuel vehicle engine may change. In order to respond to the flexible fuel vehicle market in Brazil, a study on blended fuels is performed. The main purpose of this study is to enhance performance of the flexible fuel vehicle engine to target Brazilian market. Therefore, we investigated combustion characteristics and optimal spark timings of the blended fuels with various blending ratios to improve the performance of the flexible fuel vehicle engine. As a tool for prediction of the optimal spark timing for the 1.6L flexible fuel vehicle engine, the empirical equation was suggested. The validity of the equation was investigated by comparing the predicted optimal spark timings with the stock spark timings through engine tests. When the stock spark timings of E0 and E100 were optimal, the empirical equation predicted the actual optimal spark timings for blended fuels with a good accuracy. In all conditions, by optimizing spark timing control, performance was improved. Especially, torque improvements of E30 and E50 fuels were 5.4% and 1.8%, respectively, without affecting combustion stability. From these results, it was concluded that the linear interpolation method is not suitable for flexible fuel vehicle engine control. Instead of linear interpolation method, optimal spark timing which reflects specific octane numbers of gasoline–ethanol blended fuels should be applied to maximize performance of the flexible fuel vehicle engine. The results of this study are expected to save the effort required for engine calibration when developing new flexible fuel vehicle engines and to be used as a basic strategy to improve the performance of other flexible fuel vehicle engines.

Combustion characteristics of semicokes derived from pyrolysis of low rank bituminous coal

2012 ◽  
Vol 22 (5) ◽  
pp. 645-650 ◽  
Author(s):  
Wei Qian ◽  
Qiang Xie ◽  
Yuyi Huang ◽  
Jiatao Dang ◽  
Kaidi Sun ◽  
...  
Keyword(s):  
Bituminous Coal ◽  
Combustion Characteristics ◽  
Low Rank

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.

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