The Effects of Oxygen-Enriched Concentration in Combustion Air on Thermal Parameters for Forge Furnace

2014 ◽  
Vol 552 ◽  
pp. 298-303
Author(s):  
Yue Guo ◽  
Fang Qin Dai ◽  
Ni Pan
Keyword(s):  
Fuel Consumption ◽  
Oxygen Concentration ◽  
Thermal Parameter ◽  
Heating Time ◽  
Gas Production ◽  
Fuel Combustion ◽  
Thermal Parameters ◽  
Radiation Coefficient ◽  
Efficient Combustion ◽  
Combustion Technology

Oxygen-enriched combustion technology is an energy efficient combustion technology, which can intensify the flame stability, increase the temperature and reduce fuel consumption. Aiming at forge furnace as research object, the effects of oxygen-enriched concentration in combustion air on thermal parameters is studied. The mainly thermal parameter included the fuel combustion procedure, thermal transfer, heating time and the amount of fuel combustion. The results show that with the oxygen concentration increasing, the gas emission coefficient and radiation coefficient is higher. While the heating time, the volume of combustion air requirement, flue gas production and fuel consumption is decreased. Additionally, the study suggests that forge furnace can obtain maximize economic benefit when oxygen concentration is about 30%.

scholarly journals Design of new clean and efficient combustion mode and thermodynamics research using NSGA-II algorithm

2020 ◽  
Vol 24 (5 Part A) ◽  
pp. 2699-2706
Author(s):  
Guoqing Shen
Keyword(s):  
Natural Gas ◽  
Combustion Chamber ◽  
Fuel Consumption ◽  
Consumption Rate ◽  
Thermodynamic Characteristics ◽  
Dual Fuel ◽  
Combustion Mode ◽  
Nsga Ii ◽  
Fuel Consumption Rate ◽  
Efficient Combustion

In order to study a new clean and efficient combustion mode, which can relieve the pressure of traditional energy and ensure low emissions, in this study, a diesel/natural gas dual fuel engine is designed by non-dominant sorting genetic algorithm (NSGA-?), and its thermodynamic characteristics are studied. The WP10.290 Diesel engine is modified into a diesel/natural gas dual fuel engine. The emissions of harmful substances and thermal efficiency of the modified engine under different working conditions are compared. The combustion chamber structure and adaptability between combustion chamber and injection parameters are optimized by using NSGA-II algorithm and CFD software. The results show that the emission of NOx and CH4 and the fuel consumption rate can be reduced simultaneously by using the composite combustion model compared with the original engine. When the CH4 emission is close to zero, the fuel consumption rate decreases obviously, and NOx slightly increases. When the angle between the injection holes is 141.57? the amount of NOx in the cylinder is large. When the injection advance angle is 21.91?CA, the pressure in the cylinder is the highest, the CH4 production is the lowest, the NOx production is higher, and the oxygen content in the combustion mixture is less. The NOx production is the lowest. diesel/natural gas dual fuel engine can ensure efficient combustion while reducing emissions. In this study, the performance of the dual fuel engine at various speeds can be further studied, which can provide theoretical support for the design of diesel/natural gas dual fuel engine.

Study on the Performance and Exhaust Emissions of Motorcycle Engine Fuelled with Hydrogen-Gasoline Compound Fuel

2012 ◽  
Vol 8 (3) ◽  
pp. 69-81 ◽  
Author(s):  
Chang-Huei Lin ◽  
Li-Ming Chu ◽  
Hsiang-Chen Hsu
Keyword(s):  
Air Pollution ◽  
Performance Test ◽  
Engine Performance ◽  
Combustion Efficiency ◽  
Hydrogen Gas ◽  
Spark Plug ◽  
The People ◽  
Efficient Combustion ◽  
Combustion Technology ◽  
Save Energy

The motorcycle plays an important role in the life for the people of Taiwan. However, the motorcycles’ emissions are the main moving air pollution sources. Therefore, it’s important to develop more efficient combustion technology in order to save energy and reduce air pollution. In this paper, a novel technology of hydrogen-gasoline compound fuel is developed. Hydrogen gas is released from solid state hydrogen storage tank and then mixed with the incoming gasoline. The intake valve in manifold sucks the hydrogen-gasoline compound fuel into the cylinder for combustion. A series of performance test is conducted by motorcycle chassis dynamometers. The results reveal that this technology can increase the power and torque, and decrease fuel consumption per kilo-power due to promote combustion efficiency. In addition, the hydrogen has greater heat value, so the oil temperature and spark plug temperature increase. This technique can reduce CO and HC, but increase CO2 and NOx. The engine performance is improved at rarefied hydrogen-gasoline compound fuel. Therefore, the engine performance with M.J. #98 is better than that with M.J. #110. This technique can achieve energy saving and environment-friendly purpose.

scholarly journals Thermal Effect of Different Laying Modes on Cross-Linked Polyethylene (XLPE) Insulation and a New Estimation on Cable Ampacity

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2994 ◽  
Author(s):  
Zhu ◽  
Zhao ◽  
Han ◽  
Wang ◽  
Wang ◽  
...  
Keyword(s):  
Thermal Effect ◽  
Thermal Parameter ◽  
Thermal Parameters ◽  
Breakdown Field ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Modeling Software ◽  
The Relationship ◽  
Insulation Condition ◽  
Xlpe Insulation

This paper verifies the fluctuation on thermal parameters and ampacity of the high-voltage cross-linked polyethylene (XLPE) cables with different insulation conditions and describes the results of a thermal aging experiment on the XLPE insulation with different operating years in different laying modes guided by Comsol Multiphysics modeling software. The thermal parameters of the cables applied on the models are detected by thermal parameter detection control platform and differential scanning calorimetry (DSC) measurement to assure the effectivity of the simulation. Several diagnostic measurements including Fourier infrared spectroscopy (FTIR), DSC, X-ray diffraction (XRD), and breakdown field strength were conducted on the treated and untreated specimens in order to reveal the changes of properties and the relationship between the thermal effect and the cable ampacity. Moreover, a new estimation on cable ampacity from the perspective on XLPE insulation itself has been proposed in this paper, which is also a possible way to judge the insulation condition of the cable with specific aging degree in specific laying mode for a period of time.

Effect of oxygen concentration on oxy-fuel combustion characteristic and interactions of coal gangue and pine sawdust

2019 ◽  
Vol 87 ◽  
pp. 288-294 ◽  
Author(s):  
Yuanyuan Zhang ◽  
Jiangting Zhao ◽  
Zhibin Ma ◽  
Fengling Yang ◽  
Fangqin Cheng
Keyword(s):  
Oxygen Concentration ◽  
Fuel Combustion ◽  
Coal Gangue ◽  
Combustion Characteristic ◽  
Pine Sawdust ◽  
Effect Of Oxygen

scholarly journals Development of Electrically Aerated Stove for Pyrolyzed Briquettes

2020 ◽  
pp. 37-43
Author(s):  
O. K. Fadele ◽  
M. B. Usman ◽  
O. C. Ariyo ◽  
U. U. Emeghara ◽  
D. O. Adelani ◽  
...  
Keyword(s):  
Combustion Chamber ◽  
Burning Rate ◽  
Fuel Consumption ◽  
Power Output ◽  
Thermal Efficiency ◽  
Thermal Parameters ◽  
Specific Fuel Consumption ◽  
Mean Values ◽  
Wood Shavings ◽  
The Mean

In this study, an electrically aerated stove was developed using locally available materials. The performance of the stove was evaluated by utilizing briquettes produced from pyrolyzed jatropha shell and Eucalyptus camadulensis wood shavings. Thermal parameters such as thermal efficiency, power output, specific fuel consumption and burning rate were determined. The mean values obtained for the thermal efficiency, power output, specific fuel consumption and burning rate were 7.62 %, 1685 J/s, 0.2377 g/g, 330.90 g/hr respectively. The performance of the briquette stove was considered to not be suboptimal. The thermal efficiency can further be improved by proper insulation and adequate utilization of the heat generated in the combustion chamber.

scholarly journals Medium-Energy Synthesis Gases from Waste as an Energy Source for an Internal Combustion Engine

2021 ◽  
Vol 12 (1) ◽  
pp. 98
Author(s):  
Andrej Chríbik ◽  
Marián Polóni ◽  
Ľuboš Magdolen ◽  
Matej Minárik
Keyword(s):  
Internal Combustion Engine ◽  
Fuel Consumption ◽  
Synthesis Gas ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Gas Production ◽  
Inert Gases ◽  
Basic Material ◽  
Medium Energy ◽  
Gasification Process

The aim of the presented article is to analyse the influence of synthesis gas composition on the power, economic, and internal parameters of an atmospheric two-cylinder spark-ignition internal combustion engine (displacement of 686 cm3) designed for a micro-cogeneration unit. Synthesis gases produced mainly from waste contain combustible components as their basic material (methane, hydrogen, and carbon monoxide), as well as inert gases (carbon dioxide and nitrogen). A total of twelve synthesis gases were analysed that fall into the category of medium-energy gases with lower heating value in the range from 8 to 12 MJ/kg. All of the resulting parameters from the operation of the combustion engine powered by synthesis gases were compared with the reference fuel methane. The results show a decrease in the performance parameters for all operating loads and an increase in hourly fuel consumption. Specifically, for the operating speed of the micro-cogeneration unit (1500 L/min), the decrease in power parameters was in the range of 7.1–23.5%; however, the increase in hourly fuel consumption was higher by 270% to 420%. The decrease in effective efficiency ranged from 0.4 to 4.6%, which in percentage terms represented a decrease from 1.3% to 14.5%. The process of fuel combustion was most strongly influenced by the proportion of hydrogen and inert gases in the mixture. It can be concluded that setting up the synthesis gas production in the waste gasification process in order to achieve optimum performance and economic parameters of the combustion engine for a micro cogeneration unit has an influential role and is of crucial importance.

scholarly journals USE OF TWO-STAGE FUEL COMBUSTION TECHNOLOGY TO MINIMIZE HAZARDOUS EMISSIONS AT KAZAKHSTAN TPP

2021 ◽  
Vol 335 (1) ◽  
pp. 74-80
Author(s):  
A.S. Askarova ◽  
P. Safarik ◽  
S.A. Bolegenova ◽  
V.Yu. Maximov ◽  
A.O. Nugymanova ◽  
...  
Keyword(s):  
Combustion Chamber ◽  
Mass Transfer Process ◽  
Fuel Combustion ◽  
Low Grade ◽  
Two Stage ◽  
Entire Volume ◽  
Coal Fuel ◽  
Air Supply ◽  
Stage Combustion ◽  
Combustion Technology

Studies have been carried out using numerical modeling methods to determine the effect of the introduction of a two-stage combustion technology (OFA technology) of high-ash Karaganda coal on the characteristics of combustion processes: aerodynamics of flows, temperature and concentration (COх, NOх) fields throughout the entire volume of the combustion chamber of the BKZ-75 boiler at Shakhtinskaya TPP and at the outlet from it. Comparison with the basic regime of combustion of pulverized coal fuel, when there is no air supply through additional injectors (OFA = 0%). To implement the technology of two-stage combustion, various regimes of additional air supply through injectors were chosen: OFA equals 0% (basic version, conventional combustion), 5%, 10%, 15%, 18%, 20%, 25% and 30% of total air volume required for fuel combustion. A comparative analysis of the main characteristics of the heat and mass transfer process in the combustion chamber for the investigated modes is carried out. It is shown that an increase in the volume of additional air supplied through the injectors up to 18% leads to a decrease in the concentration of nitrogen oxide NO by 25% in comparison with traditional combustion. A further increase in the volume of additional air leads to a deterioration in these indicators. The results obtained will make it possible to optimize the combustion of low-grade fuel in the combustion chamber of the BKZ-75 boiler, increase the efficiency of fuel burnout, reduce harmful emissions and introduce a two-stage combustion technology at other coal-fired TPPs.

scholarly journals Experimental Study on NOx Reduction in Oxy-fuel Combustion Using Synthetic Coals with Pyridinic or Pyrrolic Nitrogen

2018 ◽  
Vol 8 (12) ◽  
pp. 2499 ◽  
Author(s):  
Chang’an Wang ◽  
Pengqian Wang ◽  
Lin Zhao ◽  
Yongbo Du ◽  
Defu Che
Keyword(s):  
Oxygen Content ◽  
Power Plants ◽  
Large Scale ◽  
Nox Reduction ◽  
Fuel Combustion ◽  
Combustion Technology ◽  
Carbon Dioxide Co2 ◽  
No2 Formation ◽  
The Impact ◽  
Pyridinic Nitrogen

Oxy-fuel combustion technology can capture carbon dioxide (CO2) in the large-scale and greatly lower nitrogen oxides (NOx) emission in coal-fired power plants. However, the influence of inherent minerals on NOx reduction still remains unclear and the impact of oxy-fuel combustion on the transformation of different nitrogen functional groups has yet to be fully understood. The present work aims to obtain a further understanding of the NOx reduction during oxy-fuel combustion using synthetic coals with pyrrolic or pyridinic nitrogen. Compared to pyridinic nitrogen, more of the pyrrolic nitrogen in synthetic coal was converted to NOx. The conversion ratio of nitric oxide (NO) first increased significantly with the rising oxygen content and then trended to an asymptotically constant as the oxygen (O2) content varied between 10–50%. The nitrogen dioxide (NO2) formation was roughly proportional to the oxygen content. The NO2 conversion was increased with particle size but the case of NO showed a non-monotonic variation. The catalytic effects of sodium carbonate (Na2CO3), calcium carbonate (CaCO3), and ferric oxide (Fe2O3) on the transformation of pyridinic nitrogen to NO were independent of the combustion atmosphere, while the alteration from air to the oxy-fuel combustion led to a change of mineral catalytic effect on the oxidation of pyrrolic nitrogen within the coal matrix.

Recent Advances in Coherent Anti-Stokes Raman Scattering of Carbon Dioxide for Combustion Diagnostic. (Article Review)

2021 ◽  
Vol 6 (1) ◽  
pp. 42-47
Author(s):  
Henry Misoi ◽  
Josephat Tanui ◽  
Patrick Wanjiru
Keyword(s):  
Carbon Dioxide ◽  
Raman Scattering ◽  
Measurement Techniques ◽  
Fuel Combustion ◽  
Probe Molecule ◽  
Detailed Knowledge ◽  
Recent Advances ◽  
Combustion Properties ◽  
Combustion Technology ◽  
Anti Stokes

The rising climatic degradation due to the emission of greenhouse gases is leading to emergence of clean combustion technology, oxy-fuel combustion to minimize the emissions of carbon dioxide into the atmosphere in combustion. Nitrogen molecules are used as probe molecule in laser-based combustion diagnostic in nitrogen rich air combustion. However, with the introduction of oxy-fuel combustion, carbon dioxide becomes the dominant molecule and has to be considered as probe molecule in combustion diagnostic. A detailed knowledge about thermodynamic properties: temperature, pressure and species concentration are necessary in optimization of combustion and minimizing the emission into the atmosphere. The non-intrusive spectroscopic measurement techniques are the most accurate methods to determine the combustion properties. The purpose of this review is to provide a brief overview of the recent advances made in application of coherent anti-Stokes Raman scattering of carbon dioxide for development of models for thermometry. However, there is no sufficient empirical data of time-domain S-branch Raman linewidth dependence on temperature that has been determined for pure-rotational coherent anti-Stokes Raman scattering of carbon dioxide and its mixtures for development of models for thermometry.

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