scholarly journals Analysis of Homogeneous Charge Compression Ignition (HCCI) Engines for Cogeneration Applications

2005 ◽  
Vol 128 (1) ◽  
pp. 16-27 ◽  
Author(s):  
Salvador M. Aceves ◽  
Joel Martinez-Frias ◽  
Gordon M. Reistad
Keyword(s):  
Diesel Engines ◽  
High Efficiency ◽  
Homogeneous Charge Compression Ignition ◽  
Utilization Efficiency ◽  
Small Scale ◽  
Compression Ignition ◽  
Hcci Engines ◽  
Si Engines ◽  
Prime Movers ◽  
Homogeneous Charge

This paper presents an evaluation of the applicability of homogeneous charge compression ignition (HCCI) engines for small-scale cogeneration (<1MWe) in comparison to five previously analyzed prime movers. The five comparator prime movers include stoichiometric spark-ignited (SI) engines, lean burn SI engines, diesel engines, microturbines, and fuel cells. The investigated option, HCCI engines, is a relatively new type of engine that has some fundamental differences with respect to other prime movers. The prime movers are compared by calculating electric and heating efficiency, fuel consumption, nitrogen oxide (NOx) emissions, and capital and fuel costs. Two cases are analyzed. In case 1, the cogeneration facility requires combined power and heating. In case 2, the requirement is for power and chilling. The results show that HCCI engines closely approach the very high fuel utilization efficiency of diesel engines without the high emissions of NOx and the expensive diesel fuel. HCCI engines offer a new alternative for cogeneration that provides a combination of low cost, high efficiency, low emissions, and flexibility in operating temperatures that can be optimally tuned for cogeneration systems. HCCI is the most efficient engine technology that meets the strict 2007 CARB NOx standards for cogeneration engines, and merits more detailed analysis and experimental demonstration.

scholarly journals Analysis of Homogeneous Charge Compression Ignition (HCCI) Engines for Cogeneration Applications

2004 ◽  
Author(s):  
Salvador M. Aceves ◽  
Joel Martinez-Frias ◽  
Gordon M. Reistad
Keyword(s):  
Diesel Engines ◽  
High Efficiency ◽  
Homogeneous Charge Compression Ignition ◽  
Utilization Efficiency ◽  
Small Scale ◽  
Compression Ignition ◽  
Hcci Engines ◽  
Si Engines ◽  
Prime Movers ◽  
Homogeneous Charge

This paper presents an evaluation of the applicability of Homogeneous Charge Compression Ignition Engines (HCCI) for small-scale cogeneration (less than 1 MWe) in comparison to five previously analyzed prime movers. The five comparator prime movers include stoichiometric spark-ignited (SI) engines, lean burn SI engines, diesel engines, microturbines and fuel cells. The investigated option, HCCI engines, is a relatively new type of engine that has some fundamental differences with respect to other prime movers. Here, the prime movers are compared by calculating electric and heating efficiency, fuel consumption, nitrogen oxide (NOx) emissions and capital and fuel cost. Two cases are analyzed. In Case 1, the cogeneration facility requires combined power and heating. In Case 2, the requirement is for power and chilling. The results show that HCCI engines closely approach the very high fuel utilization efficiency of diesel engines without the high emissions of NOx and the expensive diesel fuel. HCCI engines offer a new alternative for cogeneration that provides a unique combination of low cost, high efficiency, low emissions and flexibility in operating temperatures that can be optimally tuned for cogeneration systems. HCCI engines are the most efficient engine technology that meets that oncoming 2007 CARB NOx standards for cogeneration engines. The HCCI engine appears to be a good option for cogeneration systems and merits more detailed analysis and experimental demonstration.

Experimental and numerical investigation of effect of fuel on ion sensor signal to determine combustion timing in homogeneous charge compression ignition engines

2005 ◽  
Vol 6 (5) ◽  
pp. 465-474 ◽  
Author(s):  
P Mehresh ◽  
D Flowers ◽  
R W Dibble
Keyword(s):  
High Efficiency ◽  
Homogeneous Charge Compression Ignition ◽  
Combustion Process ◽  
Ion Concentration ◽  
Compression Ignition ◽  
Ion Sensors ◽  
Pressure Transducers ◽  
Hcci Engines ◽  
Start Of Combustion ◽  
Homogeneous Charge

Homogeneous charge compression ignition (HCCI) engines offer promise owing to low emissions and high efficiency. However, the control of the combustion process in HCCI engines, specifically the control of the start of combustion (SOC) or ignition timing, remains a challenge. Piezoelectric pressure transducers are used in research engines for determination of the start of combustion; however, these pressure transducers are too expensive and fragile for applications in commercial engines. Recent work by the authors as well as other investigators has shown the potential of inexpensive ion sensors in HCCI engines fuelled with propane or gasoline. However, the working range of ion sensors is limited in HCCI engines owing, in large part, to the fact that the peak cycle temperature in HCCI combustion is quite low (∼ 1700–1900 K). With the guidance of detailed chemical kinetic modelling it is shown that fuels or additives producing a higher concentration of CH radicals will probably produce higher ion concentrations. Acetylene (HC=CH) is known to produce large concentrations of CH radicals. Hence, various mixtures of propane and acetylene are numerically and experimentally studied. The ion concentration substantially increases with the addition of a small amount of acetylene. This research is an effort to understand the ion generation mechanism in HCCI engines with a view towards improving the ion signal.

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