Energy and Exergy Analysis of a Trigeneration Facility with Natural Gas Engine

2014 ◽  
pp. 621-636
Author(s):  
Emin Acikkalp ◽  
Ozgur Balli ◽  
Hasan Yamik ◽  
Haydar Aras
Keyword(s):  
Natural Gas ◽  
Exergy Analysis ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Energy And Exergy ◽  
Energy And Exergy Analysis

scholarly journals Energy and Exergy Analysis of Different Exhaust Waste Heat Recovery Systems for Natural Gas Engine Based on ORC

2019 ◽  
Author(s):  
Guillermo Valencia ◽  
Armando Fontalvo ◽  
Yulineth Cardenas ◽  
Jorge Duarte ◽  
Cesar Isaza
Keyword(s):  
Natural Gas ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Exergy Analysis ◽  
Waste Heat ◽  
Natural Gas Engine ◽  
Exhaust Waste Heat ◽  
Energy And Exergy ◽  
Energy And Exergy Analysis ◽  
Net Power Output

One way to increase overall natural gas engine efficiency is to transform exhaust waste heat into useful energy by means of a bottoming cycle. Organic Rankine cycle (ORC) is a promising technology to convert medium and low grade waste heat into mechanical power and electricity. This paper presents an energy and exergy analysis of three ORC-Waste heat recovery configurations by using an intermediate thermal oil circuit: Simple ORC (SORC), ORC with Recuperator (RORC) and ORC with Double Pressure (DORC), and Cyclohexane, Toluene and Acetone have been proposed as working fluids. An energy and exergy thermodynamic model is proposed to evaluate each configuration performance, while available exhaust thermal energy variation under different engine loads was determined through an experimentally validated mathematical model. Additionally, the effect of evaportating pressure on net power output , absolute thermal efficiency increase, absolute specific fuel consumption decrease, overall energy conversion efficiency, and component exergy destruction is also investigated. Results evidence an improvement in operational performance for heat recovery through RORC with Toluene at an evaporation pressure of 3.4 MPa, achieving 146.25 kW of net power output, 11.58% of overall conversion efficiency, 28.4% of ORC thermal efficiency, and an specific fuel consumption reduction of 7.67% at a 1482 rpm engine speed, a 120.2 L/min natural gas Flow, 1.784 lambda, and 1758.77 kW mechanical engine power.

Low temperature techniques for natural gas purification and LNG production: An energy and exergy analysis

2016 ◽  
Vol 180 ◽  
pp. 546-559 ◽  
Author(s):  
Margaret Baccanelli ◽  
Stefano Langé ◽  
Matteo V. Rocco ◽  
Laura A. Pellegrini ◽  
Emanuela Colombo
Keyword(s):  
Low Temperature ◽  
Natural Gas ◽  
Exergy Analysis ◽  
Gas Purification ◽  
Natural Gas Purification ◽  
Energy And Exergy ◽  
Energy And Exergy Analysis

scholarly journals Energy and Exergy Analysis of Different Exhaust Waste Heat Recovery Systems for Natural Gas Engine Based on ORC

Energies ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 2378 ◽  
Author(s):  
Guillermo Valencia ◽  
Armando Fontalvo ◽  
Yulineth Cárdenas ◽  
Jorge Duarte ◽  
Cesar Isaza
Keyword(s):  
Natural Gas ◽  
Conversion Efficiency ◽  
Power Output ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Energy And Exergy ◽  
Net Power Output

Waste heat recovery (WHR) from exhaust gases in natural gas engines improves the overall conversion efficiency. The organic Rankine cycle (ORC) has emerged as a promising technology to convert medium and low-grade waste heat into mechanical power and electricity. This paper presents the energy and exergy analyses of three ORC–WHR configurations that use a coupling thermal oil circuit. A simple ORC (SORC), an ORC with a recuperator (RORC), and an ORC with double-pressure (DORC) configuration are considered; cyclohexane, toluene, and acetone are simulated as ORC working fluids. Energy and exergy thermodynamic balances are employed to evaluate each configuration performance, while the available exhaust thermal energy variation under different engine loads is determined through an experimentally validated mathematical model. In addition, the effect of evaporating pressure on the net power output, thermal efficiency increase, specific fuel consumption, overall energy conversion efficiency, and exergy destruction is also investigated. The comparative analysis of natural gas engine performance indicators integrated with ORC configurations present evidence that RORC with toluene improves the operational performance by achieving a net power output of 146.25 kW, an overall conversion efficiency of 11.58%, an ORC thermal efficiency of 28.4%, and a specific fuel consumption reduction of 7.67% at a 1482 rpm engine speed, a 120.2 L/min natural gas flow, 1.784 lambda, and 1758.77 kW of mechanical engine power.

Energy and exergy analysis of reciprocating natural gas expansion engine based on valve configurations

Energy ◽  
2018 ◽  
Vol 158 ◽  
pp. 986-1000 ◽  
Author(s):  
Mohsen Jannatabadi ◽  
Mahmood Farzaneh-Gord ◽  
Hamid Reza Rahbari ◽  
Abolfazl Nersi
Keyword(s):  
Natural Gas ◽  
Exergy Analysis ◽  
Expansion Engine ◽  
Energy And Exergy ◽  
Energy And Exergy Analysis ◽  
Gas Expansion

Energy and exergy analysis of natural gas pressure reduction points equipped with solar heat and controllable heaters

2014 ◽  
Vol 72 ◽  
pp. 258-270 ◽  
Author(s):  
M. Farzaneh-Gord ◽  
A. Arabkoohsar ◽  
M. Deymi Dasht-bayaz ◽  
L. Machado ◽  
R.N.N. Koury
Keyword(s):  
Natural Gas ◽  
Exergy Analysis ◽  
Gas Pressure ◽  
Pressure Reduction ◽  
Solar Heat ◽  
Energy And Exergy ◽  
Energy And Exergy Analysis

scholarly journals Exergy Analysis of a Turbo Expander: Modeling and Simulation

2021 ◽  
Vol 68 (2) ◽  
pp. 304-312
Author(s):  
Adel El-Husseiny ◽  
Rania Farouq ◽  
Hassan A. Farag ◽  
Yehia El Taweel
Keyword(s):  
Natural Gas ◽  
Thermodynamic Properties ◽  
Exergy Analysis ◽  
Energy Utilization ◽  
Feed Stream ◽  
Natural Gases ◽  
Energy And Exergy ◽  
Turbo Expander ◽  
Energy And Exergy Analysis ◽  
Gas Fields

Natural gas is a mixture that is widely used in the industries. Knowledge of its thermodynamic properties is essential for evaluating the process and equipment performance. This paper quantifies the energy that can be extracted from natural gas using a turbo expander. Natural gases of wide-ranging compositions collected from 6 different gas fields in Egypt were investigated based on energy and exergy analysis. The study was conducted using MATLAB. Numerous simulation runs were made by taking various typical feed compositions classified as lean and rich. The effects of increasing the amount of C1, C5 in the feed stream on the efficiency of energy utilization are presented. A validation analysis was performed. The results show similar trends and good agreements. It was concluded from the results that when the concentration of methane in the gas mixture increase, the exergetic efficiency decreases. The results also show that the values of thermodynamic properties depend on the relative amount of heavy components in the feed stream.

Exergy Analysis of a Compressed Natural Gas Turbocharged Spark Ignited Engine

2010 ◽  
Author(s):  
S. M. Mirsalim ◽  
A. Hajialimohammadi ◽  
M. Ehteram ◽  
V. Fakhari
Keyword(s):  
Natural Gas ◽  
Flow Rate ◽  
Exergy Analysis ◽  
Gasoline Engine ◽  
Compressed Natural Gas ◽  
Engine Efficiency ◽  
Fuel Flow ◽  
Energy And Exergy ◽  
Energy And Exergy Analysis ◽  
Exergy Losses

Turbo charging the CNG fueled engine is a new concept for development of the natural gas vehicles. Investigating the performance of this type of engine based on the thermodynamic laws is a useful way that can help to improve the methods of exploiting the useful work from energy and exergy losses. In this study, energy and exergy analysis are applied to the experimental data of a turbo charged CNG fueled engine. The engine was EF7 TC, which is four stroke bi-fuel CNG-gasoline engine. The data are collected using an engine test unit which enables accurate measurements of fuel flow rate, combustion air flow rate, engine speed and all the relevant temperatures. Energy and exergy efficiencies are calculated for different engine speeds and compared. Results indicate that exergy efficiency is maximum at a speed of 2500 rpm and the speed in which the maximum exergy and energy occur are not the same. It is concluded that using the unused output energy of the engine can increase useful work and therefore improve engine efficiency.

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