Experimental Study on Combustion Characteristics of Biomass Charcoal in Air and O2/CO2 Atmosphere

2013 ◽  
Vol 724-725 ◽  
pp. 338-342
Author(s):  
Yong Jia Wang ◽  
Kui Hua Han ◽  
Hui Li ◽  
Jian Li Zhao
Keyword(s):  
Loss Rate ◽  
Combustion Characteristics ◽  
Effect Of Temperature ◽  
Temperature Peak ◽  
Maximum Weight ◽  
Flow Tube ◽  
Weight Loss Rate ◽  
Air Atmosphere ◽  
Better Than ◽  
Maximum Weight Loss

The effect of temperature on the charcoal yield of cornstalk carbonization was investigated in a flow tube furnace. Thermogravimetic analysis was used to study the combustion characteristics of cornstalk and charcoal in air and O2/CO2atmosphere respectively. Characteristics parameters were calculated and analyzed, including ignition temperature, peak temperature, maximum weight loss rate, burnout temperature, average burning rate and burning characteristics index. Results show that the charcoal yield of carbonization decreases with rising temperature. The combustion characteristics of cornstalk in air atmosphere are better than that in O2/CO2atmosphere. However, the combustion characteristics of charcoal are better in O2/CO2atmosphere.

Effects of Catalysts on Pyrolysis of Chlorella

2012 ◽  
Vol 433-440 ◽  
pp. 161-165
Author(s):  
Gui Ju Li ◽  
Ru Yu Zhao ◽  
Li Ping Bai
Keyword(s):  
Weight Loss ◽  
Loss Rate ◽  
Inorganic Compounds ◽  
Optimal Dosage ◽  
Maximum Weight ◽  
Weight Loss Rate ◽  
Two Factors ◽  
Catalytic Effects ◽  
Derivative Thermogravimetry ◽  
Maximum Weight Loss

Sodium compounds, Na2CO3，Na2SO4，NaCl, have been investigated with regard to their catalytic effects on chlorella pyrolysis by thermal analysis experiments. The influence of catalyst categories and dosage on chlorella pyrolysis were studied by the comparison and analysis of the TG（thermogravimetry）and DTG(derivative thermogravimetry) curves derived from tests of differential thermal balance of untreated chlorelal and chlorella mixed with three inorganic compounds of certain scale.The results show that the catalytic effect of the sodium compounds follow Na2CO3>Na2SO4>NaCl, Catalysts of Na2SO4，NaCl decreased the maximum weight loss rates while Na2CO3 increased them. And all the three additives lowered the pyrolysis temperature of chlorella，of which Na2CO3 made the highest conversion of chlorella pyrolysis. As the dosage of carbonate increased, the pyrolysis temperatures decreases and the maximum weight loss rate increases, but the conversion rate of chlorella pyrolysis decreases, considering these two factors, 5%wt is chosen as the optimal dosage of the catalysts.

Hot Air Ignition Characteristics of Cotton and Corn Straw Pellet Based on TG-DTG

2014 ◽  
Vol 672-674 ◽  
pp. 164-167
Author(s):  
Yong Zhang Cui ◽  
Yun Xia Qu ◽  
Ming Tian Tang ◽  
Peng Gao ◽  
Guo Kai Zhang
Keyword(s):  
Weight Loss ◽  
Air Temperature ◽  
Gas Flow ◽  
Loss Rate ◽  
Low Flow ◽  
Maximum Weight ◽  
Weight Loss Rate ◽  
Hot Air ◽  
Ignition Characteristics ◽  
Maximum Weight Loss

In this paper, using TG-DTG and single pellets hot air ignition experiment to study the hot air ignition characteristics of biomass forming granule, analyzes the hot air temperature, velocity, flow rate of its influence on ignition performance. It was found that the weight loss rate of surface material significantly higher than the center materials of the pellet at different heating rates through the experiment, and lignin pyrolysis accelerated leading to substantially coincide of hemicellulose, cellulose and lignin pyrolysis, With the increase of air temperature, maximum weight loss rate increased, the pellet heating rate accelerated, sped up the pellet ignition, the ignition temperature should be above 500°C. As the increase of gas flow, the weight loss of corn stalks is reduced after increased first, little change in the final weight loss. Weight loss rate is decreased first and then increased. The maximum weight loss rate is essentially the same at low flow, but the maximum weight loss rate reduced and the time extension after more than 50ml/min.

Effect of Pressure on the Length of Cavity and Cavitation Damage Behind Circular Cylinders in a Venturi

1973 ◽  
Vol 95 (2) ◽  
pp. 197-205 ◽  
Author(s):  
D. V. Chandrasekhara ◽  
B. C. Syamala Rao
Keyword(s):  
Weight Loss ◽  
Pressure Range ◽  
Loss Rate ◽  
Circular Cylinders ◽  
Maximum Weight ◽  
Weight Loss Rate ◽  
Cavitation Damage ◽  
Effect Of Pressure ◽  
Damage Data ◽  
Maximum Weight Loss

The effect of pressure on the length of cavity and cavitation damage is investigated with a venturi for cavities in water behind circular cylinders. The pressure range covered is 2.45 kgm/cm2 to 5.50 kgm/cm2 gage. Damage data are obtained for two sizes of cavitation sources of diameters 1.90 cm and 2.22 cm. Damage increased to a peak and decreased further with decrease in pressure. The studies on the length of cavity were extended to eight source diameters ranging from 0.95 cm to 3.18 cm. The increase in the length of cavity was slow up to about the length equal to 3 to 4 diameters and was rapid thereafter with decrease in pressure. The influence of test section boundaries on the phenomenon was investigated by observing the incipient, desinent, and choke cavitation conditions for fourteen blockage ratios ranging from 0.09 to 0.50. The boundary effects were less significant for blockage ratios less than 0.30. Attempts for unified correlations of the observed data by using weight loss at the beginning of steady-state zone corresponding to a maximum weight-loss rate in correlating the normalized volume of erosion with the normalized cavitation parameter, indicated peak damage at the same value of the normalized cavitation parameter.

Thermogravimetric Analysis on the Combustion Characteristics of the Blend of Organic Waste Liquid and Coal

2013 ◽  
Vol 316-317 ◽  
pp. 23-27
Author(s):  
Han Fu ◽  
Shu Zhong Wang ◽  
Ming Luo
Keyword(s):  
Activation Energy ◽  
Weight Loss ◽  
Organic Waste ◽  
Loss Rate ◽  
Combustion Characteristic ◽  
Maximum Weight ◽  
Temperature Zone ◽  
Weight Loss Rate ◽  
Ignition Characteristic ◽  
Maximum Weight Loss

The characteristics of ignition and combustion and activation energy of YiMin coal and organic waste liquid and their blends in different blending ratio are studied by thermogravimetric analysis. The experimental results show that ignition and burning characteristics of coal are better than organic waste liquid. The ignition temperature of organic waste liquid will decrease, while the maximum weight loss rate will increase and the time corresponded to maximum weight loss rate will get earlier with the increase amount of the coal added. Activation energy of samples is calculated. Compared with the coal, the activation energy of the low temperature zone of organic waste liquid is lower and its ignition characteristic is better. The activation energy of the high temperature zone is bigger and its combustion characteristic is worse. The coal added will reduce the ignition characteristic but promote the combustion characteristic of organic waste liquid. The analysis of the combustion index S indicates that the comprehensive combustion characteristic of the organic waste improves significantly when coal is blended, and the best blending ratio is 2:3.

scholarly journals Co-Combustion Characteristics of Typical Biomass and Coal Blends by Thermogravimetric Analysis

2021 ◽  
Vol 9 ◽  
Author(s):  
Ye Yuan ◽  
Yong He ◽  
Jiaxin Tan ◽  
Yongmeng Wang ◽  
Sunel Kumar ◽  
...  
Keyword(s):  
Thermogravimetric Analysis ◽  
Loss Rate ◽  
Mass Loss Rate ◽  
Reaction Model ◽  
Combustion Characteristics ◽  
Corn Straw ◽  
Weight Loss Rate ◽  
Exponential Factor ◽  
Maximum Mass Loss ◽  
Maximum Weight Loss

In this study, the co-combustion characteristics of coal and biomass blends (20, 40, 60, 80, and 100 wt%) were investigated by thermogravimetric analysis. All the samples were operated under an oxidative atmosphere, with a heating rate of 20 C/min. The reaction stages, ignition and burnout temperature, maximum weight loss rate, and different combustion indices were determined. When the percentage of biomass in the blends was increased, the maximum mass loss rate was enhanced in the second region, and the ignition and burnout temperature was lowered, indicating the higher reactivity and better combustion performance of the samples. The comprehensive performance index presented an N shape with the increasing biomass blending ratio. Based on various combustion indices, 20% was an optimum percentage for the co-utilization of coal-biomass blends. A significant promoting interaction was observed between corn straw and rice straw blends, while inhibiting effects occurred between rice husk and coal. The kinetic parameters of the blends were evaluated by the Coats and Redfern method using the nth-order reaction model. The value of activation energy and the pre-exponential factor increased with the decreasing biomass percentage in the blends.

scholarly journals Thermogravimetric analysis of empty fruit bunch

2018 ◽  
Vol 225 ◽  
pp. 02002 ◽  
Author(s):  
Girma T. Chala ◽  
Ying P. Lim ◽  
Shaharin A. Sulaiman ◽  
Chin L. Liew
Keyword(s):  
Thermogravimetric Analysis ◽  
Heat Flow ◽  
Loss Rate ◽  
Renewable Energy Sources ◽  
Thermal Reaction ◽  
Maximum Temperature ◽  
Empty Fruit Bunch ◽  
Weight Loss Rate ◽  
Minimum Heat ◽  
Maximum Weight Loss

This paper presents the characteristics of empty fruit bunch (EFB) using thermogravimetric analysis (TGA) and shows its potential as a renewable energy sources. A set of data were collected from the thermal reaction and plotted in mass or percentage of the initial mass against either temperature or time, respectively. In the thermogravimetric analysis, mass, temperature and time were considered as base measurements and important data for derivative thermogravimetric (DTG) curve were analysed while many additional measures could be derived from these three base measurements. It was observed that heating rate of 8.5°C/min and air flow rate of 85mL/min provided a maximum weight loss rate of 0.209%/°C at the temperature of 313.5°C and the derivative weight peak of -0.1895mg/°C at 292°C. The time taken to reach the maximum temperature of 899.9°C was 46.74 minutes, and ΔT endo-up reflected minimum point of -0.2°C at 15.82 minutes and maximum ΔT endo-up of 888°C at 42 minutes. Heat flow endo-up also showed that the minimum heat flow was 15.39mW at 15.85 minutes and reaching the peak heat flow endo-up of 47.73mW at 43.27 minutes.

The Effect of Corn Stalk Microcrystalline Cellulose on Thermal and Mechanical Properties of Chitosan Composites

2012 ◽  
Vol 174-177 ◽  
pp. 1038-1041 ◽  
Author(s):  
Chun Guang Li ◽  
Xiang Ping Wang ◽  
Lei Liu ◽  
Jie Hu Cui ◽  
Rui Zhang
Keyword(s):  
Thermal Properties ◽  
Tensile Properties ◽  
Microcrystalline Cellulose ◽  
Loss Rate ◽  
Composite Films ◽  
Corn Stalk ◽  
Weight Loss Rate ◽  
Elongation At Break ◽  
Biodegradable Composite ◽  
Maximum Weight Loss

The biodegradable composite films were prepared from corn stalk microcrystalline cellulose as filler and chitosan as polymeric matrix. The crystallinity, the tensile properties and the thermal properties of the composites were tested. The results show that the tensile properties and thermal properties were improved with the addition of corn stalk microcrystalline cellulose. When corn stalk microcrystalline cellulose account for 10% of the chitosan quality, the initial decomposition and maximum weight loss rate temperature was raised by 13.19°C and 38.84°C, tensile strength increased by 83.55% and elongation at break increased by 77.38% compared to those of pure chitosan

Effects of Calcium Carbonate on the Thermal Properties of Acrylonitrile-Butadiene-Styrene/Calcium Carbonate Composites

2013 ◽  
Vol 834-836 ◽  
pp. 276-280
Author(s):  
Xiao Juan Bai ◽  
Ling Wang
Keyword(s):  
Thermal Properties ◽  
Calcium Carbonate ◽  
Loss Rate ◽  
Acrylonitrile Butadiene Styrene ◽  
Mixed Gas ◽  
Scanning Calorimetry ◽  
Weight Loss Rate ◽  
Thermal Stability Of ◽  
Butadiene Styrene ◽  
Maximum Weight Loss

Calcium carbonate (CaCO3) is a filler widely used in plastics. In this study, the effects of CaCO3content and size on the thermal properties of acrylonitrile-butadiene-styrene (ABS)/CaCO3composites were determined by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). TGA results in nitrogen showed that the maximum weight loss rate of the composites gradually decreased with increasing CaCO3content. TGA results in a mixed gas containing oxygen showed that CaCO3addition facilitated the degradation of ABS, and ABS degradation was completed at relatively low temperatures. The effect of nano-CaCO3on the thermal stability of the composites was similar to that of microsized CaCO3.

Thermogravimetric Study on the Combustion Characteristics of Corn Stalk and Low Volatile Coal

2014 ◽  
Vol 1008-1009 ◽  
pp. 277-280
Author(s):  
Dong Yang ◽  
Zai Qiang Lou ◽  
Meng Zhang
Keyword(s):  
Coal Combustion ◽  
Loss Rate ◽  
Combustion Characteristics ◽  
Main Stage ◽  
Corn Stalk ◽  
Heating Rates ◽  
Moisture Evaporation ◽  
Tg And Dtg ◽  
Combustion Processes ◽  
Better Than

The combustion characteristics of corn stalk and low volatile coal were carried out through the thermogravimetric experiments.The heating rates is 40°C/min.We used the Q50.It is found that the combustion processes of corn stalk and the low volatile coal combustion include moisture evaporation,volatile evolution and combustion,char combustion three stages.The main stage of corn stalk is volatile evolution and combustion and the main stage of low volatile coal is char combustion.Compare the TG and DTG curves of the corn stalk and the low volatile coal combustion we find the corn stalk is easy to be ignited and fires quickly at the atmosphere of pure oxygen.The corn stalk weightlessness mainly happens between 120~300°C,the biggest weight loss rate is 252%/min while the low volatile’s is 56%/min.The firing effect of corn stalk is better than the low volatile’s.

scholarly journals Effect of Carbon Nanotubes on the Microstructure and Thermal Property of Phenolic/Graphite Composite

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
The Huu Nguyen ◽  
Minh Thanh Vu ◽  
Van Thu Le ◽  
Tuan Anh Nguyen
Keyword(s):  
Carbon Nanotubes ◽  
Weight Loss ◽  
Thermal Property ◽  
Carbon Fibers ◽  
Loss Rate ◽  
Graphite Powder ◽  
Weight Loss Rate ◽  
Graphite Composite ◽  
Graphite Composites ◽  
Maximum Weight Loss

In this work, composites based on phenolic resin (P), graphite powder (G), carbon fibers (CFs), and carbon nanotubes (CNTs) were prepared by using hot compression molding. The effect of CNTs on the microstructure and thermal property of these composites was investigated. FESEM analysis indicated that the surface structure of phenolic/graphite composites became more dense and homogeneous with the presence of CNTs. The carbonization behavior of composites was characterized by using thermal gravimetric analyses (TGAs). TGA data showed that the presence of CNTs in phenolic/graphite composites enhanced their thermal stability, by increasing the temperature of maximum weight loss rate (Tm) during pyrolysis and decreasing the weight loss after pyrolysis. In addition, incorporation of CNTs into phenolic/graphite composites reduced significantly their open porosity.

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