Fuel injection characteristics of diesel-stimulated natural gas combustion

In the electric arc furnace (EAF) process, post-combustion (PC) technology is applied to utilize the chemical energy in the CO and H2 evolving off of the steel bath through the injection of oxygen. PC technology also improves productivity and helps to optimize the benefits of oxygen and fuel injection. In order to obtain insight on the characteristics of PC inside an electric-arc furnace, a computational fluid dynamics (CFD) model was developed to investigate the combustion characteristics in the EAF with a flat bath assumption. The natural gas is used in EAF operation process, however, the natural gas combustion is not included in this CFD model to simplify the model towards examining the effect of CO post-combustion. The eddy-dissipation (ED) was employed to model the combustion reactions. The CFD model was validated with literature on the flow velocity and temperature profiles. The effects of CO post-combustion and the oxygen mass flow rate on the furnace heat transfer efficiency in the EAF were studied.

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Co-Firing of Kerosene and Biodiesel With Natural Gas in a Low NOx Radial Swirl Combustor

Volume 1: Aircraft Engine; Ceramics; Coal, Biomass and Alternative Fuels; Controls, Diagnostics and Instrumentation ◽

10.1115/gt2012-68597 ◽

2012 ◽

Cited By ~ 3

Author(s):

Mohamed A. Altaher ◽

Hu Li ◽

Gordon E. Andrews

Keyword(s):

Natural Gas ◽

Fuel Injection ◽

Liquid Fuels ◽

Inlet Temperature ◽

Nox Emissions ◽

Fuel Injector ◽

Gas Combustion ◽

Swirl Combustor ◽

Low Nox Combustion ◽

Natural Gas Combustion

Co-firing of biodiesel with natural gas, using a low NOx gas turbine combustor was investigated and compared with the equivalent natural gas and kerosene co-firing. The work was carried out at atmospheric pressure with 600K air inlet temperature and used an 8 vane radial swirler. Well mixed natural gas combustion was achieved using radially inward gas fuel injection through the wall of the swirler outlet throat. The biofuel was injected centrally using an eight hole radial fuel injector. This central fuel injector location forms a good pilot flame for natural gas low NOx combustion and was the only fuel injection location that biodiesel combustion could be stabilised. This was because central fuel injection was into the hot recirculating gases on the centreline that is a feature of radial swirl lean low NOX combustion. The biodiesel results were compared with equivalent tests for kerosene as the central injection fuel. Co-firing was investigated with a low level of main natural gas combustion that was held constant and the equivalence ratio was increased using the central injection of biodiesel or kerosene. Operation on kerosene with no acoustic problem was demonstrated up to Ø = 0.95. Three natural gas initial equivalence ratios were investigated with co-firing of liquid fuels, Ø = 0.18, 0.22 and 0.34. A key benefit of operating with hotter premixed combustion with natural gas was that the overall Ø at which stable low CO and HC operation could be achieved with biodiesel was extended to leaner overall Ø. The NOx emissions in this co-firing mode were remarkably low for relatively rich overall mixtures, where conventional single fuel main injection on natural gas gave higher NOx emissions.

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Research of pressure influence in the gas supply system on the energy consuption level of gas devices

JOURNAL OF HYDROCARBON POWER ENGINEERING ◽

10.31471/2311-1399-2019-2(12)-56-63 ◽

2019 ◽

Vol 6 (2) ◽

pp. 56-63

Author(s):

L. D. Pylypiv ◽

І. І. Maslanych

Keyword(s):

Natural Gas ◽

Residential Buildings ◽

Supply System ◽

Normal Operation ◽

Gas Combustion ◽

Efficient Operation ◽

Gas Consumption ◽

Natural Gas Combustion ◽

Gas Supply

There are investigated the influence of operating pressures in the gas supply system on the level of such energy indicators as efficiency, gas flow and gas overrun by gas equipment in residential buildings. There is established a relationship between the values of operating pressures in the gas supply system and the gas consumption level of household appliances. The causes of insufficient pressure in the gas networks of settlements are analyzed in the article. There is also developed an algorithm for calculating the change in the efficiency of gas appliances depending on the operational parameters of the gas network. It has been found that the most efficient operation of gas appliances is observed at an overpressure at the inlet of gas appliances of about 1200 Pa.To ensure the required quality of natural gas combustion among consumers and minimize gas consumption there are justified the following measures in the article: coordinating a domestic regulatory framework for assessing the quality of natural gas with international norms and standards; improving the preparation of gas coming from local wells before supplying it to gas distribution networks; auditing low pressure gas pipelines and reconstructing areas affected by corrosion; ensuring standard gas pressure in the network for the normal operation of domestic gas appliances; stating quality indicators of natural gas combustion by gas sales organizations.

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Development of environment-friendly dual fuel pulverized coal-natural gas combustion technology for the co-firing power plant boiler: Experimental and numerical analysis

Energy ◽

10.1016/j.energy.2021.120550 ◽

2021 ◽

Vol 228 ◽

pp. 120550

Author(s):

Iman Rahimipetroudi ◽

Kashif Rashid ◽

Je Bok Yang ◽

Sang Keun Dong

Keyword(s):

Numerical Analysis ◽

Power Plant ◽

Natural Gas ◽

Dual Fuel ◽

Environment Friendly ◽

Gas Combustion ◽

Power Plant Boiler ◽

Combustion Technology ◽

Natural Gas Combustion ◽

Plant Boiler

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The effect of nitrogen content in oxy-natural gas combustion on the CO concentration in premixed flame

Journal of the Energy Institute ◽

10.1016/j.joei.2015.11.003 ◽

2017 ◽

Vol 90 (1) ◽

pp. 21-29 ◽

Cited By ~ 1

Author(s):

Wojciech Jerzak

Keyword(s):

Natural Gas ◽

Nitrogen Content ◽

Premixed Flame ◽

Gas Combustion ◽

Co Concentration ◽

Natural Gas Combustion

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Multiflame Patterns in Swirl-Driven Partially Premixed Natural Gas Combustion

Journal of Engineering for Gas Turbines and Power ◽

10.1115/1.1520159 ◽

2002 ◽

Vol 125 (1) ◽

pp. 40-45 ◽

Cited By ~ 5

Author(s):

K. P. Vanoverberghe ◽

E. V. Van den Bulck ◽

M. J. Tummers ◽

W. A. Hu¨bner

Keyword(s):

Natural Gas ◽

Combustion Chamber ◽

Gas Flow ◽

State Transition ◽

Gas Combustion ◽

Bifurcation Phenomena ◽

Major Species ◽

Partially Premixed ◽

Natural Gas Combustion ◽

Low Nox Emission

Five different flame states are identified in a compact combustion chamber that is fired by a 30 kW swirl-stabilized partially premixed natural gas burner working at atmospheric pressure. These flame states include a nozzle-attached tulip shaped flame, a nonattached torroidal-ring shaped flame (SSF) suitable for very low NOx emission in a gas turbine combustor and a Coanda flame (CSF) that clings to the bottom wall of the combustion chamber. Flame state transition is generated by changing the swirl number and by premixing the combustion air with 70% of the natural gas flow. The flame state transition pathways reveal strong hysteresis and bifurcation phenomena. The paper also presents major species concentrations, temperature and velocity profiles of the lifted flame state and the Coanda flame and discusses the mechanisms of flame transition and stabilization.

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