A simplified fuel-NOx model based on regression analysis

Xu, Minghou; Fan, Yuanchao; Yuan, Jianwei; Sheng, Changdong; Yao, Hong

doi:10.1002/(sici)1099-114x(199902)23:2<157::aid-er470>3.0.co;2-x

Cited by 5 publications

(2 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Monitoring the whole process resulted in the moisture content being recorded over a period of time, and based on these results, we created an equation. In all cases and throughout our experiment the volume of fuel and mass remain constant [18][19][20][21].…”

Section: Resultsmentioning

confidence: 93%

Implementation of Basic Principles of Econometric Analysis in Petroleum Technology: A Review of the Econometric Evidence

Tsanaktsidis¹,

Spinthiropoulos²

2019

Petroleum Chemicals - Recent Insight

View full text Add to dashboard Cite

In the present study we give the opportunity to understand the physicochemical parameters of distilling petroleum products applying the basic principles of econometric analysis. The quality of the different fuels is expressed by a series of physical, chemical or other characteristics. The connection between production process and quality of fuel is crucial in the field of petroleum technology. It is remarkable that the used method of the regression analysis perfectly illustrates the relationships between the variables in all applied models. Econometrics is one the best methods to study the variation of the physicochemical properties of the oil. The use of econometrics methods in petroleum chemistry turned out to be useful tool in order to prove that there is indeed strong rates volatility and correlation between physicochemical properties of oils with their mixes. In Petroleum Industry the most common types of Diesel fuels are the biodiesel, biomass to liquid or gas to liquid Diesel. The results of our research can be an important tool for the development of software that can anticipate changes of physicochemical properties of petroleum distillate products, taking into account specific parameters.

show abstract

Section: Resultsmentioning

confidence: 93%

Implementation of Basic Principles of Econometric Analysis in Petroleum Technology: A Review of the Econometric Evidence

Tsanaktsidis¹,

Spinthiropoulos²

2019

Petroleum Chemicals - Recent Insight

View full text Add to dashboard Cite

show abstract

“…However, new direct injection (DI) diesel engine strategies (involving high injection pressure, multiple injections, and high turbocharger levels) have led to a very fast combustion process (which takes place mostly on the diesel jet contour) due to the improvement of the atomization, evaporation, and air entrainment phenomena. Thus, despite of the high local burnt temperature inside the combustion chamber, more complex kinetic reaction mechanisms are required to obtain more reliable results due to several reasons: the lack of time to reach the equilibrium state (mainly for the radical species controlling the combustion process, such as H, OH, and HO 2 ), the kinetically controlled autoignition of some part of the fuel when pilot and/or postinjections are used (as occurs in HCCI engines, where the H 2 O 2 plays also an important role), the current observed destruction of NO through reaction with unburnt hydrocarbons (reburning) derived from the use of high EGR rates (as occurs in low temperature combustion (LTC) processes), – and the use of NO x control techniques based on kinetic aspects (such as selective noncatalytic reduction (SNCR), which involves the addition of urea (CO(NH 2 ) 2 ) or ammonia (NH 3 ) to the combustion products at the end of the engine expansion stroke , ).…”

Section: Introductionmentioning

confidence: 99%

Role of the Chemical Kinetics on Modeling NO_x Emissions in Diesel Engines

2007

View full text Add to dashboard Cite

New diesel engine strategies (involving high injection pressure and multiple injections) have been proposed in recent years aiming to reduce pollutant emissions (mainly NO x and particulate matter). These strategies have led to very fast combustion processes as a consequence of the improvement on the fuel atomization, evaporation, and air entrainment phenomena. Although NO x emissions models for diesel engines usually assume equilibrium and/or the steady state hypothesis together with the consideration of very simplified kinetic reaction mechanisms (such as the Lavoie method based on the extended Zeldovich reaction mechanism), modern diesel engine combustion models require more complex chemical kinetic approaches due mainly to the lack of time to reach the equilibrium state. These kinetic considerations are even more important for simulating new diesel combustion concepts (such as homogeneous charge compression ignition (HCCI) and low temperature combustion (LTC)), which are well-known to be kinetically controlled. In such a frame, this work shows, through a reaction mechanism which considers 83 reactions and 38 chemical compounds, the role of the kinetics on the local NO formation/destruction paths under typical diesel engine conditions. The analysis has been carried out for different combustion and dilution rates, showing that equilibrium assumptions overestimate the engine NO emissions. Reactions controlling NO formation during both the combustion and dilution processes have been identified through a sensitivity analysis carried out by using the chemical package CHEMKIN 4.0. This analysis suggests a coupling between the fuel oxidation process and the thermal NO mechanism, which is not considered in most of the diesel engine NO x models. Finally, the differences in modeled engine NO emissions caused by the uncertainties derived from the different kinetic rate values used in the literature are also presented, showing a significant need for more reliable experimental kinetic data obtained under engine pressure and temperature conditions.

show abstract