Studying the effects of hydrogen addition on the second-law balance of a biogas-fuelled spark ignition engine by use of a quasi-dimensional multi-zone combustion model

Abstract

Although a first-law analysis can show the improvement that hydrogen addition impacts on the performance of a biogas-fuelled spark-ignition (SI) engine, additional benefits can be revealed when the second law of thermodynamics is brought into perspective. It is theoretically expected that hydrogen enrichment in biogas can increase the second-law efficiency of engine operation by reducing the combustion-generated irreversibilities, because of the fundamental differences in the mechanism of entropy generation between hydrogen and traditional hydrocarbon combustion. In this study, an experimentally validated closed-cycle simulation code, incorporating a quasi-dimensional multi-zone combustion model that is based on the combination of turbulent entrainment theory and flame stretch concepts for the prediction of burning rates, is further extended to include second-law analysis for the purpose of quantifying the respective improvements. The analysis is applied for a single-cylinder homogeneous charge SI engine, fuelled with biogas—hydrogen blends, with up to 15 vol% hydrogen in the fuel mixture, when operated at 1500r/min, wide-open throttle, fuel-to-air equivalence ratio of 0.9, and ignition timing of 20° crank angle before top dead centre. Among the major findings derived from the second-law balance during the closed part of the engine cycle is the increase in the second-law efficiency from 40.85 per cent to 42.41 per cent with hydrogen addition, accompanied by a simultaneous decrease in the combustion irreversibilities from 18.25 per cent to 17.18 per cent of the total availability of the charge at inlet valve closing. It is also illustrated how both the increase in the combustion temperatures and the decrease in the combustion duration with increasing hydrogen content result in a reduction in the combustion irreversibilities. The degree of thermodynamic perfection of the combustion process from the second-law point of view is quantified by using two (differently defined) combustion exergetic efficiencies, whose maximum values during the combustion process increase with hydrogen enrichment from 49.70 per cent to 53.45 per cent and from 86.01 per cent to 87.33 per cent, respectively.

Keywords

second-law analysis irreversibilities spark ignition engine hydrogen enrichment biogas quasi-dimensional multi-zone combustion model

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References

Kowalewicz

Wojtyniak

Alternative fuels and their application to combustion engines. Proc. IMechE, Part D: J. Automobile Engineering, 2005, 219, 103–125.

Mustafi

N. N.

Raine

R. R.

Bansal

P. K.

The use of biogas in internal combustion engines: a review. In Proceedings of 2006 ASME Internal Combustion Engine Division Spring Technical Conference, Aachen, Germany, 8-10 May 2006, paper ICES2006–1306 (American Society of Mechanical Engineers, New York).

Porpatham

Ramesh

Nagalingam

Effect of hydrogen addition on the performance of a biogas fuelled spark ignition engine. Int. J. Hydrogen Energy, 2007, 32, 2057–2065.

Sierens

Rosseel

Variable composition hydrogen/natural gas mixtures for increased engine efficiency and decreased emissions. Trans. ASME, J. Engng Gas Turbines Power, 2000, 122, 135–140.

Dimopoulos

Rechsteiner

Soltic

Laemmle

Boulouchos

Increase of passenger car engine efficiency with low engine-out emissions using hydrogen-natural gas mixtures: A thermodynamic analysis. Int. J. Hydrogen Energy, 2007, 32, 3073–3083.

Moran

M. J.

Availability analysis: a guide to efficient energy use, 1982 (Prentice-Hall, Englewood Cliffs, New Jersey).

Bejan

Advanced engineering thermodynamics, 1988 (John Wiley, New York).

Moran

M. J.

Shapiro

H. N.

Fundamentals of engineering thermodynamics, 2000 (John Wiley, New York).

Gyftopoulos

E. P.

Beretta

G. P.

Thermodynamics: fundamentals and applications, 1991 (Macmillan, London).

10.

Alkidas

A. C.

The application of availability and energy balances to a diesel engine. Trans. ASME, J. Engng Gas Turbines Power, 1988, 110, 462–469.

11.

Alkidas

A. C.

The use of availability and energy balances in diesel engines. SAE paper 890822, 1989.

12.

Rakopoulos

C. D.

Giakoumis

E. G.

Parametric study of transient turbocharged diesel engine operation from the second-law perspective. SAE paper 2004–01–1679, 2004.

13.

Rakopoulos

C. D.

Giakoumis

E. G.

Availability analysis of a turbocharged diesel engine operating under transient load conditions. Energy, 2004, 29, 1085–1104.

14.

Rakopoulos

C. D.

Giakoumis

E. G.

Second-law analysis of indirect injection turbocharged diesel engine operation under steady-state and transient conditions. SAE paper 2005–01–1131, 2005.

15.

Rakopoulos

C. D.

Giakoumis

E. G.

Second-law analyses applied to internal combustion engines operation. Prog. Energy Combust. Sci., 2006, 32, 2–47.

16.

Giakoumis

E. G.

Cylinder wall insulation effects on the first- and second-law balances of a turbo-charged diesel engine operating under transient load conditions. Energy Conversion Managmt, 2007, 48, 2925–2933.

17.

Caton

J. A.

A cycle simulation including the second law of thermodynamics for a spark-ignition engine: implications of the use of multiple-zones for combustion. SAE paper 2002–01–0007, 2002.

18.

Caton

J. A.

Use of a cycle simulation incorporating the second law of thermodynamics: results for spark-ignition engines using oxygen enriched combustion air. SAE paper 2005–01–1130, 2005.

19.

Rakopoulos

C. D.

Kyritsis

D. C.

Hydrogen enrichment effects on the second law analysis of natural and landfill gas combustion in engine cylinders. Int. J. Hydrogen Energy, 2006, 31, 1384–1393.

20.

Rakopoulos

C. D.

Scott

M. A.

Kyritsis

D. C.

Giakoumis

E. G.

Availability analysis of hydrogen/natural gas blends combustion in internal combustion engines. Energy, 2008, 33, 248–255.

21.

Rakopoulos

C. D.

Michos

C. N.

Quasidimensional, multi-zone combustion modelling of turbulent entrainment and flame stretch for a spark ignition engine fuelled with hydrogen-enriched biogas. Int. J. Veh. Des., 2008 (in press).

22.

Rakopoulos

C. D.

Michos

C. N.

Multi-zone combustion modeling of a spark ignition engine fueled with syngas fuel. In Proceedings of the 20th International Conference on Efficiency, cost, optimization, simulation and environmental impact of energy systems (ECOS 2007), Padova, Italy, 25-28 June 2007, vol. 1, pp. 123–130 (SGEditorial, Padova, Italy).

23.

Rakopoulos

C. D.

Michos

C. N.

Development and validation of a multi-zone combustion model for performance and nitric oxide formation in syngas fueled spark ignition engine. Energy Conversion Managmt, 2008, 49(10), 2924–2938.

24.

Ferguson

C. R.

Internal combustion engines, 1986 (John Wiley, New York).

25.

Fox

J. W.

Cheng

W. K.

Heywood

J. B.

A model for predicting residual gas fraction in sparkignition engines. SAE paper 931025, 1993.

26.

Heywood

J. B.

Internal combustion engine fundamentals, 1988 (McGraw-Hill, New York).

27.

Gordon

McBride

B. J.

Computer program for the calculation of complex chemical equilibrium composition, rocket performance, incident and reflected shocks, and Chapman-Jouguet detonations. NASA Special Publication SP-273, National Aeronautics and Space Administration, 1971.

28.

Annand

W. J. D.

Heat transfer in the cylinders of reciprocating internal combustion engines. Proc. Instn Mech. Engrs., 1963, 177, 973–990.

29.

Blizard

N. C.

Keck

J. C.

Experimental and theoretical investigation of turbulent burning model for internal combustion engines. SAE paper 740191, 1974.

30.

Tabaczynski

R. J.

Ferguson

C. R.

Radhakrishnan

A turbulent entrainment model for sparkignition engine combustion. SAE paper 770647, 1977.

31.

Tabaczynski

R. J.

Trinker

F. H.

Shannon

B. A. S.

Further refinement and validation of a turbulent flame propagation model for spark-ignition engines. Combust. Flame, 1980, 39, 111–121.

32.

Beretta

G. P.

Rashidi

Keck

J. C.

Turbulent flame propagation and combustion in spark ignition engines. Combust. Flame, 1983, 52, 217–245.

33.

Keck

J. C.

Heywood

J. B.

Noske

Early flame development and burning rates in spark ignition engines and their cyclic variability. SAE paper 870164, 1987.

34.

Herweg

Maly

R. R.

A fundamental model for flame kernel formation in S.I. engines. SAE paper 922243, 1992.

35.

Chung

S. H.

Law

C. K.

An integral analysis of the structure and propagation of stretched premixed flames. Combust. Flame, 1988, 72, 325–336.

36.

Law

C. K.

Combustion physics, 2006 (Cambridge University Press, Cambridge).

37.

Dai

Davis

G. C.

Hall

M. J.

Matthews

R. D.

Diluents and lean mixture combustion modeling for SI engines with a quasi-dimensional model. SAE paper 952382, 1995.

38.

Bradley

Lung

F. K.-K.

Spark ignition and the early stages of turbulent flame propagation. Combust. Flame, 1987, 69, 71–93.

39.

Annand

W. J. D.

Geometry of spherical flame propagation in a disc-shaped combustion chamber. J. Mech. Engng Sci., 1970, 12, 146–149.

40.

Tennekes

Lumley

J. L.

A first course in turbulence, 1972 (MIT Press, Cambridge, Massachusetts).

41.

Stone

Clarke

Beckwith

Correlations for the laminar-burning velocity of methane/diluent/air mixtures obtained in free-fall experiments. Combust. Flame, 1998, 114, 546–555.

42.

Rhodes

D. B.

Keck

J. C.

Laminar burning speed measurements of indolene-air-diluent mixtures at high pressures and temperatures. SAE paper 850047, 1985.

43.

Verhelst

Sierens

A quasi-dimensional model for the power cycle of a hydrogen-fuelled ICE. Int. J. Hydrogen Energy, 2007, 32, 3545–3554.

44.

Di Sarli

Di Benedetto

Laminar burning velocity of hydrogen-methane/air premixed flames. Int. J. Hydrogen Energy, 2007, 32, 637–646.

45.

Rakopoulos

C. D.

Michos

C. N.

Giakoumis

E. G.

Availability analysis of a syngas fueled spark ignition engine using a multi-zone combustion model. Energy, 2008, 33, 1378–1398.

46.

Chavannavar

P. S.

Caton

J. A.

Destruction of availability (exergy) due to combustion processes: A parametric study. Proc. IMechE, Part A: J. Power and Energy, 2006, 220, 655–669.

47.

Bueno

A. V.

Velásquez

J. A.

Milanez

L. F.

Exergy based diagnosis of in-cylinder diesel engine processes. SAE paper 2004–01–3258, 2004.

48.

Velásquez

J. A.

Milanez

L. F.

Analysis of the irreversibilities in diesel engines. SAE paper 940673, 1994.

49.

Dunbar

W. R.

Lior

Sources of combustion irreversibility. Combust. Sci. Technol., 1994, 103, 41–61.

50.

Van Gerpen

J. H.

Shapiro

H. N.

Second-law analysis of diesel engine combustion. Trans. ASME, J. Engng Gas Turbines Power, 1990, 112, 129–137.