Study on the NOx emissions mechanism of an HICE under high load

Duan, Junfa; Liu, Fushui; Yang, Zhenzhong; Sun, Baigang; Chen, Weichang; Wang, Lijun

doi:10.1016/j.ijhydene.2017.07.048

Cited by 39 publications

(13 citation statements)

References 26 publications

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“…In the GWO algorithm, A adjusts the balance between global exploration and local development. From equation (6), it can be found that the value of A changes with the change of control parameter α. erefore, the control parameters largely determine the global balance between exploration and local development.…”

Section: Nonlinear Dynamic Weightsmentioning

confidence: 99%

“…e combination of CFB combustion mode and ultrasupercritical parameter technology will be the inevitable development direction of CFB boilers in the future. e original NO X emission concentration of conventional CFB boilers is between 100 and 300 mg/Nm 3 [5,6], which cannot meet the national standard limit of NO X emission concentration below 100 mg/Nm 3 , and the NO X emission concentration in some areas is lower than 50 mg/Nm 3 . e ultralow emission standards, CFB boilers face the problem of having to further reduce NO x emissions.…”

Section: Introductionmentioning

confidence: 99%

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Prediction of Chemical Gas Emissions Based on Ecological Environment

Chen

2020

Journal of Chemistry

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With the serious pollution of the ecological environment, there are a large number of harmful gases in the chemical gases emitted by the industry. Relevant intelligent chemical algorithms control the emission of chemical gases, which can effectively reduce emissions and predict emissions more accurately. This paper proposes a gray wolf optimization algorithm based on chaotic search strategy combined with extreme learning machine to predict chemical emission gases, taking a 330 MW pulverized coal-fired boiler as a test object and establishing chemical emissions of CNGWO-ELM. The prediction model, by using the relevant data collected by DCS as training samples and test samples, trains and tests the model. Simulation experiments show that the chemical emission prediction model of CNGWO-ELM has better accuracy and stronger generalization ability, with higher practical value.

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Section: Nonlinear Dynamic Weightsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Prediction of Chemical Gas Emissions Based on Ecological Environment

Chen

2020

Journal of Chemistry

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“…28 As an engine computational fluid dynamics (CFD) simulation software, CONVERGE shows massive advantages that make it most commonly in practice. [29][30][31][32][33][34][35][36][37][38] In order to calculate the spray in a simulation, CONVERGE introduces drop parcels into the domain at the injector location at a user-specified rate. Parcels represent a group of identical drops (e.g.…”

Section: Simulation Softwarementioning

confidence: 99%

Numerical simulation of performance and emission of marine diesel engine under different gravity conditions

Geng

2014

Advances in Mechanical Engineering

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A computational fluid dynamics model of the marine diesel engine was established and validated, and the simulation studies were carried out using this model. Different gravity conditions were set in the computational fluid dynamics model to investigate their effect on marine diesel emissions and performance. By comparing the simulation results under different basic grid sizes, 1.2 mm was selected as the basic grid size of the computational fluid dynamics model. The model uses the experimental data including cylinder pressure, heat release rate, and nitrogen oxides (NO x) emissions to calibrate and validate the model. The simulation results are very close to the experimental data, and slight errors are also within the allowable range. In particular, when considering the heat transfer of the combustion chamber wall, the simulation results of the heat release rate are closer to the experimental data. The simulation results show that gravity has a slight effect on cylinder pressure and heat release rate, and has a certain degree of effect on fuel spray and atomization. The penetration length of the fuel is proportional to the gravity, and the maximum deviation of the Sauter mean diameter of the droplet is 25.74%. The spray and atomization process of fuel directly affects combustion and emissions. The maximum deviation of NO x emissions is 6.03%, which is reduced from 7.46 to 7.01 g/kW·h. Finally, the three-dimensional simulation results of temperature, equivalence ratio, and NO x emission of different crank angles under different gravity conditions are compared.

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“…Several studies have used CFD software to assess SI ICEs with different configurations and fuels, reducing the experimental effort and expenditures. Hydrogen has been widely studied as combustion fuel using CFD models in direct injection (DI) [34][35][36] and port-fuel injection (PFI) locations [10,[37][38][39]. Besides the analysis of the performance and emissions, the start of injection (SOI) has been studied to reduce the residual H 2 in the intake manifold and to avoid backfire in PFI engines [40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Comprehensive analysis of the combustion of low carbon fuels (hydrogen, methane and coke oven gas) in a spark ignition engine through CFD modeling

Ortiz-Imedio

Ortiz

Ortíz

2022

Energy Conversion and Management

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The use of low carbon fuels (LCFs) in internal combustion engines is a promising alternative to reduce pollution while achieving high performance through the conversion of the high energy content of the fuels into mechanical energy. However, optimizing the engine design requires deep knowledge of the complex phenomena involved in combustion that depend on the operating conditions and the fuel employed. In this work, computational fluid dynamics (CFD) simulation tools have been used to get insight into the performance of a Volkswagen Polo 1.4L port-fuel injection spark ignition engine that has been fueled with three different LCFs, coke oven gas (COG), a gaseous by-product of coke manufacture, H 2 and CH 4 . The comparison is made in terms of power, pressure, temperature, heat release, flame growth speed, emissions and volumetric efficiency. Simulations in Ansys® Forte® were validated with experiments at the same operating conditions with optimal spark advance, wide open throttle, a wide range of engine speed (2000-5000 rpm) and air-fuel ratio (λ) between 1 and 2. A sensitivity analysis of spark timing has been added to assess its impact on combustion variables. COG, with intermediate flame growth speed, produced the greatest power values but with lower pressure and temperature values at λ = 1.5, reducing the emissions of NO and the wall heat transfer. The useful energy released with COG was up to 16.5% and 5.1% higher than CH 4 and H 2 , respectively. At richer and leaner mixtures (λ = 1 and λ = 2), similar performances were obtained compared to CH 4 and H 2 , combining advantages of both pure fuels and widening the λ operation range without abnormal combustion. Therefore, suitable management of the operating conditions maximizes the conversion of the waste stream fuel energy into useful energy while limiting emissions.

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Study on the NOx emissions mechanism of an HICE under high load

Cited by 39 publications

References 26 publications

Prediction of Chemical Gas Emissions Based on Ecological Environment

Prediction of Chemical Gas Emissions Based on Ecological Environment

Numerical simulation of performance and emission of marine diesel engine under different gravity conditions

Comprehensive analysis of the combustion of low carbon fuels (hydrogen, methane and coke oven gas) in a spark ignition engine through CFD modeling

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