Additional Power Generation from the Exhaust Gas of Diesel Engine by Bottoming Rankine Cycle

2013 ◽  
Author(s):  
Shekh Nisar Hossain ◽  
Saiful Bari
Keyword(s):  
Power Generation ◽  
Diesel Engine ◽  
Rankine Cycle ◽  
Exhaust Gas

Flexible Combined Cycle Gas Turbine Power Plant Utilising Organic Rankine Cycle Technology

2016 ◽  
Author(s):  
Michael Welch ◽  
Nicola Rossetti
Keyword(s):  
Power Generation ◽  
Power Plant ◽  
Steam Turbine ◽  
Gas Turbine ◽  
Gas Turbines ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Combined Cycle ◽  
Exhaust Gas ◽  
Operational Flexibility

Historically gas turbine power plants have become more efficient and reduced the installed cost/MW by developing larger gas turbines and installing them in combined cycle configuration with a steam turbine. These large gas turbines have been designed to maintain high exhaust gas temperatures to maximise the power generation from the steam turbine and achieve the highest overall electrical efficiencies possible. However, in today’s electricity market, with more emphasis on decentralised power generation, especially in emerging nations, and increasing penetration of intermittent renewable power generation, this solution may not be flexible enough to meet operator demands. An alternative solution to using one or two large gas turbines in a large central combined cycle power plant is to design and install multiple smaller decentralised power plant, based on multiple gas turbines with individual outputs below 100MW, to provide the operational flexibility required and enable this smaller power plant to maintain a high efficiency and low emissions profile over a wide load range. This option helps maintain security of power supplies, as well as providing enhanced operational flexibility through the ability to turn turbines on and off as necessary to match the load demand. The smaller gas turbines though tend not to have been optimised for combined cycle operation, and their exhaust gas temperatures may not be sufficiently high, especially under part load conditions, to generate steam at the conditions needed to achieve a high overall electrical efficiency. ORC technology, thanks to the use of specific organic working fluids, permits efficient exploitation of low temperatures exhaust gas streams, as could be the case for smaller gas turbines, especially when working on poor quality fuels. This paper looks at how a decentralised power plant could be designed using Organic Rankine Cycle (ORC) in place of the conventional steam Rankine Cycle to maximise power generation efficiency and flexibility, while still offering a highly competitive installed cost. Combined cycle power generation utilising ORC technology offers a solution that also has environmental benefits in a water-constrained World. The paper also investigates the differences in plant performance for ORC designs utilising direct heating of the ORC working fluid compared to those using an intermediate thermal oil heating loop, and looks at the challenges involved in connecting multiple gas turbines to a single ORC turbo-generator to keep installed costs to a minimum.

Pure Working Fluid Selection for the Organic Rankine Cycle in Waste Heat Recovery of Diesel Engine

2011 ◽  
Vol 383-390 ◽  
pp. 6110-6115
Author(s):  
Hong Liang ◽  
Xing Liu ◽  
Hong Guang Zhang ◽  
Bin Liu ◽  
Yan Chen ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Working Fluid ◽  
Exhaust Gas ◽  
Alternative Refrigerants ◽  
Combustion Heat ◽  
Working Fluid Selection ◽  
Selection For

According to the analysis of heat balance, about 1/3 of the fuel combustion heat is taken away into the ambience by exhaust gas of diesel engine. Depending on the characteristics of the diesel, this paper uses a special system to recover this waste heat, in which the organic Rankine cycle is combined with a single screw expander. The economy should be improved by using this system in the diesel. The model of this system is designed in Matlab combined with REFPROP. Using this way, the thermodynamic parameters should be calculated and the thermodynamic properties of this system with different working fluids should be analyzed. At last, R245fa, R245ca, R123 and R141b are selected as the alternative refrigerants used in this system.

ORC System Development Using Diesel Engine Waste Heat

2014 ◽  
Vol 960-961 ◽  
pp. 405-409
Author(s):  
Jun Qi Dong ◽  
Jiang Zhang Wang ◽  
Rong You Zhang
Keyword(s):  
Diesel Engine ◽  
Waste Heat ◽  
System Development ◽  
Electric Energy ◽  
Organic Rankine Cycle ◽  
Stable Condition ◽  
Rankine Cycle ◽  
Working Fluid ◽  
Exhaust Gas ◽  
Commercial Plant

Based on the waste heat characteristics of the coolant and exhaust gas from diesel engine, the Organic Rankine Cycle (ORC) commercial plant had been developed. The working fluid was the R245fa, and the plate type heat exchangers were used as the condenser and evaporator in the ORC systems. The performance of condenser and evaporator had been simulated and developed using the effective-NTU method. Using the engine jacket coolant as the heating media, the coolant absorbs the waste heat from the exhaust gas and engine cylinders. The ORC system and engine can stably run for a long time without frequent control acting. The ORC systems can bring the 14.6 kw electric energy in the stable condition. The efficiency based on the first law of thermodynamics is 7.2%; complete generating efficiency is 6.25%.

Simulation of Organic Rankine Cycle Power Generation with Exhaust Heat Recovery from a 15 liter Diesel Engine

2015 ◽  
Vol 8 (2) ◽  
pp. 227-238 ◽  
Author(s):  
Aimon Allouache ◽  
Smith Leggett ◽  
Matthew J. Hall ◽  
Ming Tu ◽  
Chad Baker ◽  
...  
Keyword(s):  
Power Generation ◽  
Diesel Engine ◽  
Heat Recovery ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Exhaust Heat ◽  
Exhaust Heat Recovery

Additional Power Generation From Waste Energy of Diesel Engine Using Parallel Flow Shell and Tube Heat Exchanger

2013 ◽  
Vol 136 (1) ◽  
Author(s):  
Shekh N. Hossain ◽  
S. Bari
Keyword(s):  
Power Generation ◽  
Heat Exchanger ◽  
Diesel Engine ◽  
Heat Exchangers ◽  
Parallel Flow ◽  
Working Fluid ◽  
Exhaust Gas ◽  
Working Pressure ◽  
Tube Heat Exchanger ◽  
Shell And Tube

High temperature diesel engine exhaust gas can be an important source of heat to operate a bottoming Rankine cycle to produce additional power. In this research, an experiment was performed to calculate the available energy in the exhaust gas of an automotive diesel engine. A shell and tube heat exchanger was used to extract heat from the exhaust gas, and the performance of two shell and tube heat exchangers was investigated with parallel flow arrangement using water as the working fluid. The heat exchangers were purchased from the market. As the design of these heat exchangers was not optimal, the effectiveness was found to be 0.52, which is much lower than the ideal one for this type of application. Therefore, with the available experimental data, the important geometric aspects of the heat exchanger, such as the number and diameter of the tubes and the length and diameter of the shell, were optimized using computational fluid dynamics (CFD) simulation. The optimized heat exchanger effectiveness was found to be 0.74. Using the optimized heat exchangers, simulation was conducted to estimate the possible additional power generation considering 70% isentropic turbine efficiency. The proposed optimized heat exchanger was able to generate 20.6% additional power, which resulted in improvement of overall efficiency from 30% to 39%. Upon investigation of the effect of the working pressure on additional power generation, it was found that higher additional power can be achieved at higher working pressure. For this particular application, 30 bar was found to be the optimum working pressure at rated load. The working pressure was also optimized at part load and found that 2 and 20 were the optimized working pressures for 25% and 83% load. As a result 1.8% and 13.3% additional power were developed, respectively. Thus, waste heat recovery technology has a great potential for saving energy, improving overall engine efficiency, and reducing toxic emission per kilowatt of power generation.

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