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Exhaust heat utility system copy
- 1. Exhaust Heat Utility System
- 2. • RAMANUJAN V (201220043) • ARVIND RAJ B (201220006) • UPENDAR G D (201220054) • KIRAN KUMAR G D (201220024)
- 3. Abstract • More than 30% of the energy produced in the engine is released with the exhaust gases that are let out to the atmosphere. And, hence all the energy that is released through the exhaust is considered to be waste energy. We, now try to extract the heat that is let out to the atmosphere.
- 4. Introduction • With increasing demand to reduce fuel consumption and emission levels, it is essential to prevent energy losses in all ways possible.
- 5. Losses
- 6. Organic Rankine Cycle (ORC) • The organic rankine cycle is named for it’s use of an organic, high molecular mass fluid with liquid- vapour phase change occuring at a lower temperature than water-steam phase change. • The fluid allows Rankine cycle heat recovery from lower temperature sources such as biomass combustion, industrial waste heat, geothermal heat, solar ponds etc. The low-temperature heat is converted into useful work
- 9. Why we use ORC? • Organic fluids are advantageous when the maximum temperature is low and/or the power plant is small. • In contrast to water, the expansion in the turbine ends for most organic fluids not in the wet steam regime but in the gas phase above condenser temperature. • Another advantage of ORC in small plants is a legal and economic one since water requires increased safety at high pressure.
- 10. Working Fluid - OMTS • Octamethyltrisiloxane • Isentropic saturation vapor curve • Low freezing point, high stability temperature • High heat of vaporisation and density • Low environmental impact
- 11. Working Fluid Working Fluid Tc (K) Pc (MPa) Pmax(MPa) Tvap(K) OMTS 564 1.44 1.34 560 Toluene 592 4.11 2.00 536 Ethylbenzene 617 3.61 2.00 570 Propylbenzene 638 3.20 1.41 573 Butylbenzene 661 2.89 0.92 573
- 12. Heat exchangers – Water tube boilers • Thinner tube material allow faster heat transfer • Savings in weight about 3:1 of comparable heat transfer surface. • Flexiblity in operation • Flexiblity of design
- 13. Material used • Inconel 686 • Chromium – Molybdenum – Nickel Alloy • High corrosion resistance and high thermal conductivity
- 14. Iso-corrosion of Inconel 686
- 15. Thermal Spraying • High velocity oxy-acetylene flame • Burning a fuel-gas with oxygen/air • Flame temperature : 2750°C • Particle Speed : 1450m/s • Inconel 686 is used as powder feed stock.
- 16. Turbine An ideal steam turbine is considered to be an isentropic process, or constant entropy process, in which the entropy of the steam entering the turbine is equal to the entropy of the steam leaving the turbine. No steam turbine is truly isentropic, however, with typical isentropic efficiencies ranging from 20–90% based on the application of the turbine. The interior of a turbine comprises several sets of blades, or buckets as they are more commonly referred to. One set of stationary blades is connected to the casing and one set of rotating blades is connected to the shaft. The sets intermesh with certain minimum clearances, with the size and configuration of sets varying to efficiently exploit the expansion of steam at each stage.
- 17. Condensers • E- coated Aluminium fin – Copper tube condenser
- 19. Benefits • Recovery of the exhaust heat has direct benefit on the engine efficency. • Reduction in exhaust heat have benefit on environment friendlyness. • Benefit also includes, increased power output per unit of fuel.
- 20. Conclusion • It has been identified that there are huge potentials of energy which can be saved with the use of EXHUS (Exhaust heat utility system). • This system converts exhaust heat energy into useful mechanical energy using RANKINE CYCLE . • It would also help in the improvement on basis of performance, efficiency and emissions of the internal combustion.