Notice of Retraction: The Impact of Coal Diameter and Heating Rate to Coal Pyrolysis

2010 ◽  
Author(s):  
Hongxian Liu ◽  
Zichan Zhang
Keyword(s):  
Heating Rate ◽  
Coal Pyrolysis ◽  
The Impact

Effects of CO2 and H2O on coal pyrolysis with the ultrafast heating rate in a concentrating photothermal reactor

2021 ◽  
Author(s):  
Chi Huanying ◽  
Li Hanjian ◽  
Su Sheng ◽  
Abdulmajid Abdullahi Shagali ◽  
An Xiaoxue ◽  
...  
Keyword(s):  
Heating Rate ◽  
Coal Pyrolysis

Research on Pyrolysis Kinetics of Shenhua Coal and Direct Liquefaction Residue

2012 ◽  
Vol 550-553 ◽  
pp. 2758-2762 ◽  
Author(s):  
Xi Jie Chu ◽  
Yong Gang Wang ◽  
Li Hong Zhao
Keyword(s):  
Experimental Data ◽  
Activation Energy ◽  
Kinetic Parameters ◽  
Heating Rate ◽  
Coal Pyrolysis ◽  
Pyrolysis Kinetics ◽  
Differential Heating ◽  
Pyrolysis Behavior ◽  
Direct Liquefaction ◽  
Kinetics Of

The pyrolysis tests of Shenhua coal and Shenhua direct liquefaction residue have been carried out using thermogravimetric at the differential heating rate. The kinetic parameters k and E were calculated using DAEM method. Results show DAME model can describe the pyrolysis behavior of Shenhua coal within the range of 20% to 95%, the activation energy of coal pyrolysis ranges from 53.98 to 279.38 kJ/mol, and DAME model can describe the behavior of Shenhua direct liquefaction residue within the range of 10% to 80%, the activation energy of residue pyrolysis is about 170 kJ/mol. The results of which are basically consistent with the experimental data.

Pyrolysis Characteristics and Kinetics of Low Rank Coal

2011 ◽  
Vol 695 ◽  
pp. 493-496 ◽  
Author(s):  
Yong Hui Song ◽  
Jian Mei She ◽  
Xin Zhe Lan ◽  
Jun Zhou
Keyword(s):  
Weight Loss ◽  
Heating Rate ◽  
Frequency Factor ◽  
Low Rank ◽  
Coal Pyrolysis ◽  
Pyrolysis Characteristics ◽  
Second Stage ◽  
Thermo Gravimetric Analyzer ◽  
Kinetics Of ◽  
Pyrolysis Kinetic

The pyrolysis characteristics of Jianfanggou(JFG) coal was studied using a thermo-gravimetric analyzer and the pyrolysis kinetic parameters were calculated at the different heating rate. The results showed the DTG curves under different heating rate had three peaks and the corresponding temperature were 100°C, 470°C and 750°C, the pyrolysis process can be divided into three stages conclusively. The maximum weight loss rate at 470°C indicated the major weight loss occurred in the second stage. The Tb, Tf and T∞ obtained under experiment situation. The results of the JFG coal pyrolysis kinetic showed the Tb, Tf and T∞ increased gradually with the accretion of the heating rate. In the meantime, the variation of frequency factor was consistent with the trend of activation energy.

scholarly journals Effect of Frequency and Waveform on Inactivation of Escherichia coli O157:H7 and Salmonella enterica Serovar Typhimurium in Salsa by Ohmic Heating

2012 ◽  
Vol 79 (1) ◽  
pp. 10-17 ◽  
Author(s):  
Su-Yeon Lee ◽  
Sangryeol Ryu ◽  
Dong-Hyun Kang
Keyword(s):  
Escherichia Coli ◽  
Electrical Conductivity ◽  
Heating Rate ◽  
Salmonella Enterica ◽  
Treatment Time ◽  
Ohmic Heating ◽  
Content Type ◽  
Significant Difference ◽  
Serovar Typhimurium ◽  
The Impact

ABSTRACT The effect of frequency of alternating current during ohmic heating on electrode corrosion, heating rate, inactivation of food-borne pathogens, and quality of salsa was investigated. The impact of waveform on heating rate was also investigated. Salsa was treated with various frequencies (60 Hz to 20 kHz) and waveforms (sine, square, and sawtooth) at a constant electric field strength of 12.5 V/cm. Electrode corrosion did not occur when the frequency exceeded 1 kHz. The heating rate of the sample was dependent on frequency up to 500 Hz, but there was no significant difference ( P > 0.05) in the heating rate when the frequency was increased above 1 kHz. The electrical conductivity of the sample increased with a rise in the frequency. At a frequency of 60 Hz, the square wave produced a lower heating rate than that of sine and sawtooth waves. The heating rate between waveforms was not significantly ( P > 0.05) different when the frequency was >500 Hz. As the frequency increased, the treatment time required to reduce Escherichia coli O157:H7 and Salmonella enterica serovar Typhimurium to below the detection limit (1 log CFU/g) decreased without affecting product quality. These results suggest that ohmic heating can be effectively used to pasteurize salsa and that the effect of inactivation is dependent on frequency and electrical conductivity rather than waveform.

The Effect of Additive on Temperature Rising Characteristics during Coal Pyrolysis in Microwave Field

2012 ◽  
Vol 512-515 ◽  
pp. 1790-1794
Author(s):  
Quanrun Liu ◽  
Hao Xia
Keyword(s):  
Heating Rate ◽  
Microwave Field ◽  
Pyrolysis Temperature ◽  
Coal Pyrolysis ◽  
Final Temperature ◽  
Absorbing Material ◽  
Microwave Absorbing ◽  
Rapid Pyrolysis

The pesent paper decribed the effects of additive on temperature rising characteristic during coal pyrolysis at different temperature in microwave field. Different mixture rate of carboncoal with coal and different final temperature on coal pyrolysis tempereature rising characteristics were studied in the work. The results indicate: Coal is a poorly microwave absorbing material, and its pyrolysis in microwave field need to add a certain amount of microwave absorbent for higher heating rate; Because carbocoal can be fast heated in microwave field, so it can be used as additive for coal pyrolysis. Carbocoal otained from different pyrolysis temperature have different heating rate, along with the increase of carbocoal pyrolysis temperature, carbocoal heating rate increases in microwave field. Using charcoal as microwave absorbent for coal rapid pyrolysis in microwave field is feasible.

scholarly journals Effects of Heating Rate and Coal Type on Gas Evolution during Coal Pyrolysis

1996 ◽  
Vol 82 (5) ◽  
pp. 388-392 ◽  
Author(s):  
Takayuki TAKARADA ◽  
Nobuyoshi GOTO ◽  
Kayoko MORISHITA ◽  
Koji HAYASHI ◽  
Hidehiro KATAHIRA ◽  
...  
Keyword(s):  
Heating Rate ◽  
Gas Evolution ◽  
Coal Pyrolysis ◽  
Coal Type

scholarly journals Removal of Zinc from Aqueous Solution by Optimized Oil Palm Empty Fruit Bunches Biochar as Low Cost Adsorbent

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Seyed Ali Zamani ◽  
Robiah Yunus ◽  
A. W. Samsuri ◽  
M. A. Mohd Salleh ◽  
Bahareh Asady
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Heating Rate ◽  
Residence Time ◽  
Oil Palm ◽  
Low Cost ◽  
Bet Surface Area ◽  
Independent Variables ◽  
Empty Fruit Bunches ◽  
The Impact

This study aims to produce optimized biochar from oil palm empty fruit bunches (OPEFB), as a green, low cost adsorbent for uptake of zinc from aqueous solution. The impact of pyrolysis conditions, namely, highest treatment temperature (HTT), heating rate (HR), and residence time (RT) on biochar yield and adsorption capacity towards zinc, was investigated. Mathematical modeling and optimization of independent variables were performed employing response surface methodology (RSM). HTT was found to be the most influential variable, followed by residence time and heating rate. Based on the central composite design (CCD), two quadratic models were developed to correlate three independent variables to responses. The optimum production condition for OPEFB biochar was found as follows: HTT of 615°C, HR of 8°C/min, and RT of 128 minutes. The optimum biochar showed 15.18 mg/g adsorption capacity for zinc and 25.49% of yield which was in agreement with the predicted values, satisfactory. Results of the characterization of optimum product illustrated well-developed BET surface area and porous structure in optimum product which favored its sorptive ability.

scholarly journals Lyman-α coupling and heating at Cosmic Dawn

2020 ◽  
Author(s):  
Shikhar Mittal ◽  
Girish Kulkarni
Keyword(s):  
Heating Rate ◽  
Background Intensity ◽  
Parameter Study ◽  
Form Expression ◽  
Analytical Expression ◽  
Heating And Cooling ◽  
Scattering Correction ◽  
Close Form ◽  
The Impact ◽  
First Time

Abstract The global 21-cm signal from the cosmic dawn is affected by a variety of heating and cooling processes. We investigate the impact of heating due to Lyman-α (Ly α) photons on the global 21-cm signal at cosmic dawn using an analytical expression of the spectrum around the Ly α resonance based on the so-called ‘wing approximation’. We derive a new expression for the scattering correction and for the first time give a simple close-form expression for the cooling due to injected Ly α photons. We perform a short parameter study by varying the Ly α background intensity by four orders of magnitude and establish that a strong Ly α background is necessary, although not sufficient, in order to reproduce the recently detected stronger-than-expected 21-cm signal by the EDGES Collaboration. We show that the magnitude of this Ly α heating is smaller than previously estimated in the literature by two orders of magnitude or more. As a result, even a strong Ly α background is consistent with the EDGES measurement. We also provide a detailed discussion on different expressions of the Ly α heating rate used in the literature.

scholarly journals The impact of deep convection representation in a global atmospheric model on the warm conveyor belt and jet stream during NAWDEX IOP6

2021 ◽  
Author(s):  
Gwendal Rivière ◽  
Meryl Wimmer ◽  
Philippe Arbogast ◽  
Jean-Marcel Piriou ◽  
Julien Delanoë ◽  
...  
Keyword(s):  
Heating Rate ◽  
Large Scale ◽  
Deep Convection ◽  
Atmospheric Model ◽  
Conveyor Belt ◽  
The Other ◽  
Jet Stream ◽  
Field Campaign ◽  
Global Atmospheric Model ◽  
The Impact

Abstract. The effect of parameterized deep convection on warm conveyor belt (WCB) activity and jet stream is investigated by performing simulations of an explosively-developing large-scale cyclone that occurred during the North Atlantic Waveguide and Downstream Impact Experiment (NAWDEX) field campaign using the Météo-France global atmospheric model ARPEGE. Three simulations differing only from their deep convection representation are analysed. The first one was performed with the Bougeault et al. (1985) scheme (B85), the second one with the Prognostic Condensates Microphysics and Transport (PCMT) scheme of Piriou et al. (2007), and the third one without any parameterized deep convection. In the latter simulation, the release of convective instability at the resolved scales of the model generates localized cells marked by strong heating with few degrees extent in longitude and latitude along the fronts. In runs with active parameterized deep convection (B85, PCMT), the heating rate is more homogeneously distributed along fronts as the instability release happens at sub-grid scales. This difference leads to more rapid and abrupt ascents in the WCB without parameterized deep convection, and more moderate but more sustained ascents with parameterized deep convection. While the number of WCB trajectories does not differ much between the three simulations, the averaged heating rates over the WCB trajectories exhibits distinct behavior. After one day of simulations, the upper-level heating rate is in average larger with B85 scheme leading to stronger potential vorticity (PV) destruction. The difference comes from the large-scale heating and not the parameterized heating.A comparison with (re)analyses and a large variety of airborne observations from the NAWDEX field campaign (Doppler radar, Doppler lidar, dropsondes) made during the coordinated flights of two aircraft in the WCB outflow region shows that B85 performs better in the representation of the double jet structure at 1-day lead time than the other two simulations. That can be attributed to the more active WCB at upper levels. However this effect is too strong and that simulation becomes less realistic at longer forecast range (1.5 to 2 days) than the other ones. The simulation with PCMT scheme has an intermediate behavior between the one with B85 scheme and without parameterized deep convection but its impact on the jet stream is closer to the latter one. Finally, additional numerical experiments show that main differences in the impact on the jet between PCMT and B85 largely come from the chosen closure, the former being based on CAPE and the latter on moisture convergence.

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