Pilot-scale experimental and CFD modeling investigations of oxy-fuel combustion of Victorian brown coal

The article considers the role and place of water and water vapor in combustion processes with the purpose of reduction the effluents of nitrogen oxides and carbon oxide. We have carried out the complex of theoretical and computational researches on reduction of harmful nitrogen and carbon oxides by gas fuel combustion in dependence on humidity of atmospheric air by two approaches: CFD modeling with attraction of DRM 19 chemical kinetics mechanism of combustion for 19 components along with Bowman’s mechanism used as “postprocessor” to determine the [NO] concentration; different thermodynamic models of predicting the nitrogen oxides NO formation. The numerical simulation of the transport processes for momentum, mass and heat being solved simultaneously in the united equations’ system with the chemical kinetics equations in frame of GRI methane combustion mechanism and NO formation calculated afterwards as “postprocessor” allow calculating the absolute actual [CO] and [NO] concentrations in dependence on combustion operative conditions and on design of furnace facilities. Prediction in frame of thermodynamic equilibrium state for combustion products ensures only evaluation of the relative value of [NO] concentration by wet combustion the gas with humid air regarding that in case of dry air – oxidant. We have developed the methodology and have revealed the results of numerical simulation of impact of the relative humidity of atmospheric air on harmful gases formation. Range of relative air humidity under calculations of atmospheric air under impact on [NO] and [CO] concentrations at the furnace chamber exit makes φ = 0 – 100%. The results of CFD modeling have been verified both by author’s experimental data and due comparing with the trends stated in world literature. We have carried out the complex of the experimental investigations regarding atmospheric air humidification impact on flame structure and environmental characteristics at natural gas combustion with premixed flame formation in open air. The article also proposes the methodology for evaluation of the nitrogen oxides formation in dependence on moisture content of burning mixture. The results of measurements have been used for verification the calculation data. Coincidence of relative change the NO (NOx) yield due humidification the combustion air revealed by means of CFD prediction has confirmed the qualitative and the quantitative correspondence of physical and chemical kinetics mechanisms and the CFD modeling procedures with the processes to be studied. A sharp, more than an order of reduction in NO emissions and simultaneously approximately a two-fold decrease in the CO concentration during combustion of the methane-air mixture under conditions of humidification of the combustion air to a saturation state at a temperature of 325 K.

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Demonstration of 0.1 MWth pilot-scale pressurized oxy-fuel combustion for unpurified natural gas without CO2 dilution

Energy ◽

10.1016/j.energy.2021.120021 ◽

2021 ◽

Vol 223 ◽

pp. 120021

Author(s):

Donghee Kim ◽

Won Yang ◽

Kang Y. Huh ◽

Youngjae Lee

Keyword(s):

Natural Gas ◽

Pilot Scale ◽

Fuel Combustion

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Experimentation and CFD modeling of continuous degradation of formaldehyde by immobilized Ralstonia eutropha in a semi-pilot-scale plug flow bioreactor

Bioprocess and Biosystems Engineering ◽

10.1007/s00449-018-2052-7 ◽

2018 ◽

Vol 42 (3) ◽

pp. 485-497 ◽

Cited By ~ 4

Author(s):

Alireza Habibi ◽

Mehran Nalband ◽

Elham Jalilnejad

Keyword(s):

Ralstonia Eutropha ◽

Plug Flow ◽

Pilot Scale ◽

Cfd Modeling

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CFD modeling and optimal design of SiC deposition on the fuel combustion nozzle in a commercial CVD reactor

Ceramics International ◽

10.1016/j.ceramint.2021.12.324 ◽

2022 ◽

Author(s):

Yogesh S. Bijjargi ◽

Vijay M. Shinde ◽

Abhisek Mudgal ◽

Harish Kumar ◽

N Eswara Prasad

Keyword(s):

Optimal Design ◽

Fuel Combustion ◽

Cfd Modeling

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Pilot-Scale Evaluation of a Permeable Reactive Barrier with Compost and Brown Coal to Treat Groundwater Contaminated with Trichloroethylene

Water ◽

10.3390/w11091922 ◽

2019 ◽

Vol 11 (9) ◽

pp. 1922 ◽

Cited By ~ 1

Author(s):

S. Johana Grajales-Mesa ◽

Grzegorz Malina

Keyword(s):

Brown Coal ◽

Reductive Dechlorination ◽

Experimental Period ◽

Pilot Scale ◽

Permeable Reactive Barrier ◽

Residence Times ◽

Contaminated Aquifer ◽

Scale Evaluation ◽

Mixing Ratios ◽

Reactive Barrier

This study evaluates, under field conditions, the efficiency of a permeable reactive barrier (PRB) with compost and brown coal to remove trichloroethylene (TCE) (109 µg/L) from contaminated groundwater. Three stainless steel boxes (1.2 × 0.5 × 0.5 m) with the brown coal-compost mixture at three different mixing ratios of 1:1, 1:3, and 1:5 (by volume) were installed to simulate the PRB. Groundwater from the TCE-contaminated aquifer was pumped into the system at a flow rate of 3.6 L/h. Residence times in the boxes were of: 25, 20, 10 h, respectively. Effluent samples were analyzed for TCE and its daughter products: dichloroethylene (DCE), vinyl chloride (VC) and ethane. During the 198-day experimental period TCE concentrations in groundwater decreased below ≤1.1 µg/L, i.e., much lower than groundwater and drinking water standards in Poland. After 16 days cis-1,2-DCE was monitored indicating possible reductive dechlorination of TCE. However, complete transformation of TCE into non-toxic byproducts was not evidenced during the time of experiments, indicating that reductive dechlorination slowed down or stopped at DCE, and that the designed residence times were not long enough to allow the complete dechlorination process.

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