Characteristic of Low Calorific Fuel Gas Combustion in a Pressurized Porous Burner

2014 ◽  
Vol 1070-1072 ◽  
pp. 1713-1717
Author(s):  
Guan Qing Wang ◽  
Dan Luo ◽  
Ning Ding ◽  
Jiang Rong Xu
Keyword(s):  
Flame Front ◽  
Temperature Profile ◽  
Axial Direction ◽  
Normal Pressure ◽  
Maximum Temperature ◽  
Combustion Characteristic ◽  
Gas Combustion ◽  
Fuel Gas ◽  
Flame Propagation Velocity ◽  
Porous Burner

Combustion characteristic of low calorific fuel gas in a pressurized porous burner was numerically investigated. The two-dimensional temperature profile, flame front, and CO concentration distribution were analyzed under the pressure at the certain operating parameters, and compared with those of the normal pressure. The results shows that the pressured temperature profile is more clear than that of the normal pressure, and maximum temperature distribution region is larger. Compared with the normal pressure, the pressured flame front location is at the downstream, and the flame propagation velocity along with inclination increases with the pressure increasing. The CO distribution is corresponding to the temperature profile. Its maximum locates at the position of the flame front, and gradually decreasing along the axial direction. It decreases with the pressure increasing, which indicates that the pressure contributes to improve the combustion efficiency.

Characteristic of Low Calorific Fuel Gas Combustion in Porous Burner by Preheating Air

2014 ◽  
Vol 624 ◽  
pp. 361-365 ◽  
Author(s):  
Min Hui Fan ◽  
Guan Qing Wang ◽  
Dan Luo ◽  
Ri Zan Li ◽  
Ning Ding ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Flame Propagation ◽  
Reaction Rate ◽  
Combustion Characteristic ◽  
Gas Combustion ◽  
Fuel Gas ◽  
Flame Propagation Velocity ◽  
Co Oxidation Reaction ◽  
Porous Burner ◽  
Reaction Region

The combustion characteristic of low calorific fuel gas was numerically investigated in porous burner by preheating air. Two-dimensional temperature profile, flame propagation precess, and CO reaction rate were analyzed detailly by preheating air, and compared with that of room air. The results showed that when the air is preheated, the combustion flame location locates to upstream, the maximum combustion temperature is higher than that of room air, and flame propagation velocity decreases.The CO oxidation reaction rate increases gradually with the radius distance increaing, but reaction region decreases. CO oxidation region guradually decreases and locates to the upstream with air preheating temperature increasing. Peaks of CO oxidation rate gradually change from two to one.

Flame front stability of low calorific fuel gas combustion with preheated air in a porous burner

Energy ◽  
2019 ◽  
Vol 170 ◽  
pp. 1279-1288 ◽  
Author(s):  
Guanqing Wang ◽  
Pengbo Tang ◽  
Yuan Li ◽  
Jiangrong Xu ◽  
Franz Durst
Keyword(s):  
Flame Front ◽  
Gas Combustion ◽  
Fuel Gas ◽  
Porous Burner ◽  
Front Stability

Ultra-low calorific gas combustion in a gradually-varied porous burner with annular heat recirculation

Energy ◽  
2017 ◽  
Vol 119 ◽  
pp. 497-503 ◽  
Author(s):  
Fuqiang Song ◽  
Zhi Wen ◽  
Zhiyong Dong ◽  
Enyu Wang ◽  
Xunliang Liu
Keyword(s):  
Gas Combustion ◽  
Porous Burner ◽  
Heat Recirculation

A Multi-Dwell Temperature Profile Design for the Cure of Thick CFRP Composite Laminates

2021 ◽  
Author(s):  
Wenchang Zhang ◽  
Yingjie Xu ◽  
Xinyu Hui ◽  
Weihong Zhang
Keyword(s):  
Temperature Profile ◽  
Composite Laminates ◽  
Optimization Method ◽  
Maximum Temperature ◽  
Nsga Ii ◽  
Multi Objective ◽  
Optimization Result ◽  
Design Variables ◽  
Cure Time ◽  
Thick Laminates

Abstract This paper develops a multi-objective optimization method for the cure of thick composite laminates. The purpose is to minimize the cure time and maximum temperature overshoot in the cure process by designing the cure temperature profile. This method combines the finite element based thermo-chemical coupled cure simulation with the non-dominated sorting genetic algorithm-II (NSGA-II). In order to investigate the influence of the number of dwells on the optimization result, four-dwell and two-dwell temperature profiles are selected for the design variables. The optimization method obtains successfully the Pareto optimal front of the multi-objective problem in thick and ultra-thick laminates. The result shows that the cure time and maximum temperature overshoot are both reduced significantly. The optimization result further illustrates that the four-dwell cure profile is more e ective than the two-dwell, especially for the ultra-thick laminates. Through the optimization of the four-dwell profile, the cure time is reduced by 51.0% (thick case) and 30.3% (ultra-thick case) and the maximum temperature overshoot is reduced by 66.9% (thick case) and 73.1% (ultra-thick case) compared with the recommended cure profile. In addition, Self-organizing map (SOM) is employed to visualize the relationships between the design variables with respect to the optimization result.

Simplified IGCC With Hot Fuel Gas Combustion

1985 ◽  
Author(s):  
M. W. Horner
Keyword(s):  
Data Analysis ◽  
Alkali Metals ◽  
Experimental Testing ◽  
Fixed Bed ◽  
Coal Ash ◽  
Gas Combustion ◽  
Fuel Gas ◽  
Order Of Magnitude ◽  
Program Description ◽  
Particle Separator

Experimental testing and data analysis performed for simulated simplified IGCC system components have been completed. Earlier papers presented the program description and preliminary testing operations. This paper presents a review of the testing accomplishments and the results of data analysis. An air-blown, fixed-bed coal gasifier, and downstream cyclone particle separator were found to retain or remove coal ash particles and alkali metals very effectively. The low calorific fuel gas delivered to a gas turbine combustor was found to be significantly closer to the current “clean fuel” specification than had been anticipated. These results are very encouraging for the further development of simplified IGCC systems utilizing hot gas cleanup. Observed ash deposition rates imply that turbine cleaning would be less frequent by at least an order of magnitude as compared to operation on treated ash-forming petroleum fuels.

Predictive Study of Combustion Temperature of Liquefied Petroleum Gas (LPG) on the Spherical Packed-Bed Porous Burner

2019 ◽  
Vol 805 ◽  
pp. 109-115
Author(s):  
Rapeepong Peamsuwan ◽  
Anucha Klamnoi ◽  
Narongsak Yotha ◽  
Bundit Krittacom
Keyword(s):  
Standard Error ◽  
Gas Flow ◽  
Combustion Temperature ◽  
Packed Bed ◽  
Experimental Results ◽  
Coefficient Of Determination ◽  
Maximum Temperature ◽  
Liquefied Petroleum Gas ◽  
Independent Variables ◽  
Porous Burner

The relation between the significant factors and the combustion temperature (T) of Liquid Petroleum Gas (LPG) on the spherical packed-bed porous burner is investigated. Alumina-Cordierite ceramic balls having the average diameter (d) of 3 mm. and the porosity (ε) of 0.322 are employed as porous media. The multiple-linear and multiple-quadratic regressions are used to analyze the data at the equivalence ratio (F) of 0.58 – 0.66 and volumetric premixed-gas flow rate (Vmix) in a range of 10 – 25 m3/h. The porous thickness (H) is in the range of 2.5 – 7.5 cm. Thus, independent variables are F, Vmix and H. The dependent variable is the maximum temperature (T) of combustion LPG on the porous burner. For statistical analysis, both main and interaction of independent variables effecting to the combustion temperature are investigated. The results showed that, for the case of multiple-linear regression, an equations recommended in prediction of the T on porous burner is T = 1375.603(F) +179.636(H) – 295.028(FH) – 9.628(HVmix) + 16.368(FVmixH) with a coefficient of determination (R2) of 0.998 and the standard error of the estimation of 42.7365. In the case of multiple- quadratic regression, a proper equation used in predicting T on porous burner is T = 2133.184(F)2 + 1.247(Vmix)2 + 17.248(H)2 – 2.916(FVmix )2 – 42.107(FH)2 – 0.049(VmixH)2 + 0.123(FVmixH)2 with R2 of 0.997 and standard error of the estimation of 44.2979. In addition, the comparison between the experimental results and the predicted estimation is reported that different percentage of both regressions and experimental results is satisfied.

scholarly journals Investigation on the effect of electrode tip on formation of metal droplets and temperature profile in a vibrating electrode electroslag remelting process

Open Physics ◽  
2019 ◽  
Vol 17 (1) ◽  
pp. 743-751 ◽  
Author(s):  
Fang Wang ◽  
Jakov Baleta ◽  
Qiang Wang ◽  
Baokuan Li
Keyword(s):  
Temperature Profile ◽  
Electroslag Remelting ◽  
Temperature Fields ◽  
Maximum Temperature ◽  
Periodic Pattern ◽  
Coupled Modelling ◽  
Frequency Changes ◽  
Volume Method ◽  
Peak Value ◽  
Metal Droplets

Abstract In the present work, a transient full-coupled modelling approach has been put forward to study the effect of electrode tip on formation of metal droplets and temperature profile in the electromagnetically-controlled electroslag-remelting furnace with vibrating electrode. The electromagnetic field, momentum and energy conservation equations are solved simultaneously based on the finite volume method. The interface of slag and metal is traced using the volume of fluid approach. The results show that in the case of cone tip electrode the average dimension of metal droplets is smaller compared to the flat tip electrode. In addition, the bigger and stretched metal droplets are not observed with the cone tip electrode. The temperature fields with the cone tip electrode are distributed in a prominent periodic pattern compared to the case with flat tip electrode. The maximum temperature zone with the cone tip electrode is located along the z axial in the upper part of slag, not in the lower part. When the frequency changes from 0.17 Hz to 1 Hz, the maximum temperature reduces from 2050 K to 1985 K and the peak value of velocity decreases from 0.20 m/s to 0.125 m/s. When the vibration amplitude varies from 3mm to 6mm, the maximum temperature in the slag cover drops by 3.9% and the peak value of velocity rises by 16.7%.

Temperature Profiles in Underground Combustion

1962 ◽  
Vol 2 (01) ◽  
pp. 21-27 ◽  
Author(s):  
P.E. Baker
Keyword(s):  
Flame Front ◽  
Temperature Profile ◽  
Heat Generation ◽  
Oil Recovery ◽  
Combustion Process ◽  
Combustion Method ◽  
Qualitative Description ◽  
System A ◽  
Constant Rate ◽  
Front Advance

Introduction In this paper, approximate analytical expressions are derived for the temperature profile developed in the underground combustion method of oil recovery. A qualitative description of the process may be found in a paper by Tadema. The flame front is regarded as a moving source with a constant rate of heat generation. Heat transfer is by conduction and convection. Previous publications, of which a few are cited here, have also attacked this problem and have presented solutions pertaining to different methods of approximating or idealizing the process studied. The present paper also treats an idealized case: linear flow is assumed for heat and fluids, and vaporization and condensation effects are neglected. The results obtained are similar to those derived by Bailey and Larkin, but are obtained by an entirely different procedure. The method used here should give considerably greater insight into the physics of the in situ combustion process. Four types of cases are considered, distinguished by thermal and fluid-flow properties of the system. A constant rate of heat generation and constant rate of flame-front advance are assumed. Flamefront temperature is determined for each case using a heat balance which involves the entire temperature profile. The applicability of the different solutions to real systems is discussed after they are all presented. Again, this is done for the purpose of understanding better the physics of the process. Consideration of the nonapplicable solutions and of the reasons for their not applying is significant. In a paper by Cooperman, the only case solved is one considered here as not applicable.

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