18-07-2011, 08:38 PM
hai.. i am jishnu.I would like to present a seminar on dual fuel engines.I hope that you can help me.Please send me the full seminar report on this subject.
18-07-2011, 08:38 PM
hai.. i am jishnu.I would like to present a seminar on dual fuel engines.I hope that you can help me.Please send me the full seminar report on this subject.
19-07-2011, 09:56 AM
you can refer these page details of "dual fuel engine"link bellow
https://seminarproject.net/Thread-dual-f...ull-report
07-07-2012, 04:06 PM
Dual Fuel Engine Dual Fuel engines.docx (Size: 550.55 KB / Downloads: 97) Introduction Many large stationary engines use two fuels. Normally of these two fuels, one is gaseous and the other a liquid fuel. The two fuels can be taken in widely varying proportions to run an engine; such an engine is usually called a dual fuel engine. In the foreseeable future, for commercial road-transportation, there is no practical alternative to rival the diesel engine in efficiency and performance. There are many alternative fuel options; the most promising and practical of these is compressed natural gas (CNG). Dual fuel engines combine the most efficient powertrain to the most pragmatic alternative fuel; it enables a diesel engine to operate normally on diesel and a high proportion of CNG. Needing no changes to the diesel engine, dual fuel engine retains the performance and efficiency of the diesel cycle. By burning a high proportion of CNG efficiently, dual fuel engine delivers lower greenhouse gas, and achieves lower emissions of NOx and PM thereby decreasing pollution. Working Principle The dual-fuel engine works on diesel cycle. The gaseous fuel (the primary fuel) is added to the air inducted by the engine or supplied by the supercharger at a pressure slightly above the atmospheric pressure. This mixture of air and gaseous fuel is compressed in the cylinder just like air in normal diesel operation. At some point in the compression stroke, near top dead center, a small charge of liquid fuel called pilot fuel (or the secondary fuel) is injected through a conventional diesel fuel system. This pilot acts as a source of ignition.The gas-air mixture in the vicinity of the injected spray ignites at a number of places establishing a number of flame-fronts. Thus combustion starts smoothly and rapidly. Operation of Dual fuel engines The engine operation is controlled by a separate interfaced ECU. The dual fuel ECU communicates with the OEM engine ECU, via controller area network (CAN) to regulate accurate delivery of diesel pilot injection. With cooperation from the OEM, the dual fuel ECU can be electronically interfaced to the software of the OEM’s ECU. It takes the diesel demand signal and calculates new pilot diesel quantity and timing and gas injection quantity based on accurate and predictive air flow calculations. Figure below illustrates how the two ECU’s are integrated to deliver control of both diesel and gas. In this case, the demanded diesel quantity and timing is interrupted by the ECU, where a revised diesel quantity and timing is calculated for dual fuel operation. This new information is then passed back to the OEM ECU. |
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