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PERFORMANCE ANALYSIS OF COMBUSTION SYSTEMS

Published bySalvador Aguirre Espinoza Modified over 6 years ago

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Presentation on theme: "PERFORMANCE ANALYSIS OF COMBUSTION SYSTEMS"— Presentation transcript:

1 PERFORMANCE ANALYSIS OF COMBUSTION SYSTEMS
P M V Subbarao Professor Mechanical Engineering Department Measure to Assess the Degree of Utilization of Fuel thru Direct Combustion…..

2 Ideal (Complete) Combustion Systems

3 Natural Draft Zref Hchimney pA = pref +Dp Tgas Tatm B A

4 Mechanical (Artifical)Draft : Induced Draft
Essential when Natural Draft cannot generate required amount of breathing A B Tgas,ec Hchimney pA = patm + ratm *g *Hchimney pB = pfan,s Tatm Tgas,ic pC = patm + rch *g *Hchimney

5 Mechanical (Artifical)Draft : Forced Draft
Hchimney Tgas Tatm B A

6 Mechanical (Artifical)Draft : Balanced Draft
Hchimney pA = pfan.f pB = pfan,s B Tatm B Tgas A

7 Resistance to Air & Gas Flow Through Steam Generator System

8 +ve -ve

9 Complete & Adiabatic combustion
Systems with adiabatic and complete combustion generate combustion products with highest temperature. This is known as Adiabatic Flame Temperature of A Fuel. Systems with adiabatic but incomplete combustion generate next highest temperature of products. Non-adiabatic combustion systems generate third highest temperature products. Non-adiabatic, work generating systems generate lowest temperature products.

10 Energy Audit of an External Combustion System (Coal Fired Furnace at Site)
CXHYSZOK +e 4.76 (X+Y/2+Z-K/2) AIR + Moisture in Air + Ash Moisture in fuel→ P CO2 +Q H2O +R SO2 + T N2 + U O2 + V CO + W C + Ash Unburned carbon losses. Incomplete combustion losses. Energy Loss due to ash. Energy Loss due to moisture in air. Energy Loss due to moisture in fuel. Energy Loss due to combustion generated moisture. Energy Loss due hot exhaust gases.

11 Direct Method of Furnace Performance Analysis
Energy balance: Fuel Energy = Steam Enthalpy + Losses.

12 Energy Balance & Sankey diagram
A Sankey diagram is a graphic illustration of flows - like energy, material or money. These flows can be combined, split and traced through a series of events or stages. The width of each stream represents the amount of material or energy in the flow. Sankey diagrams , which are typically used to visualize energy transfers between processes, are named after the Irishman Matthew H. P. R. Sankey. He used this type of diagram in a publication on energy efficiency of a steam engine in 1898.

13 National Energy Sankey Diagram for India : 2001

14 National Energy Sankey Diagram for India : 2030

15 Sankey Diagram for A Solar PV Power Plant

16 Sankey Diagram for A Coal Power Sector

17 Sankey Diagram for A Coal Fired Furnace
Heat gained by boiling water 40% Loss due to moisture in air. Loss due to moisture in fuel. Loss due to combustion generated moisture. Dry Exhaust Gas Losses ~ 4.5% Fuel Energy 100% Hot gas Heat gained by superheater & reheater 40% Heat gained by economizer 6% Heat gained by air preheater 6% Flue gas Heat loss from furnace surface. Unburned carbon losses. Incomplete combustion losses. Loss due to hot ash.

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