Thermodynamic Analysis of Combined Power House and Boiler
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Transcript of Thermodynamic Analysis of Combined Power House and Boiler
THERMODYNAMIC ANALYSIS OF COMBINED POWER HOUSE AND BOILER ROOM
RAJBY INDUSTRIES WASHING UNIT – 2A
OVERALL OPERATING PLANT
MAIN BOILER
GAS GENERATOR
GENERATOR COOLING SYSTEM
HEAT RECOVERY BOILER
ANALYSIS BASIS
THERMODYNAMIC ANALYSIS BASED ON
• ENTROPY GENERATION• LOST WORK
MAIN BOILER EFFICIENCY
Table 1.• Flowrate of air ---------- 12387 kg/hr• Theoretical gas flowrate ---------- 650.3 kg/hr• Actual gas flowrate ---------- 691 kg/hr• Actual gas flow to theoretical flow ratio --------- 96/90 m3/ton steam • Boiler efficiency ---------- 90%
FOR MAIN BOILER & HEAT RECOVERY BOILER
THE ENTROPY GENERATION DEPENDS UPON• THE FUEL BURNING REACTION• TEMPERATURE DECREASES OF BURN GASES• STEAM PRODUCTION
POWER SYSTEM
• GAS GENERATOR - FEED BURNER - TURBINE - EXHAUST• WATER COOLING CYCLE - PUMP - HEATER / HX - CONDENSER
GAS GENERATOR CYCLE
FOR GAS GENERATOR CYCLE
ENTROPY GENERATION DEPENDS UPON- REACTION INSIDE FEED BURNER- TRANSFER OF ENERGY FROM BURN GASES TO
TURBINE- EXHAUST OF BURN GASES AT LOWER
PRESSURE
GENERATOR COOLING CYCLE
FOR GENERATOR COOLING CYCLE
ENTROPY GENERATION DEPENDS UPON• COOLING WATER PRESSURE INCREASED BY
PUMP• HEAT ABSORBED BY WATER FROM HEATER/HX• TEMPERATURE & PRESSURE DROP OF WATER
IN CONDENSER
TOTAL ENTROPY GENERATION• Table 10.
SYSTEM Total entropy Percent entropy generation generated
• Main boiler 2.9144 kW/k 16.2%• Gas generator 0.5567 kW/k 3.1%• Heat recovery boiler 1.82 kW/k 10.1%• Cooling cycle 2.609 kW/k 70.4%
• TOTAL 17.9001 kW/k 100 %
TOTAL LOST WORK
Table 11. SYSTEM Lost work Lost work ratio Percent (Kw) lost work• Main boiler 873 0.16 16%• Gas generator 165 0.038 3.8%• Heat recovery boiler 552 0.103 10.3%• Cooling cycle 3759 0.702 70.2%
TOTAL 5.349x103 1.00 100%
CONCLUSION:
• The total lost work from the power and boiler room is 5349 kW or 5.3 MW.
• The most inefficient system being the power generation unit (gas generator and water cooling system).
• Lost work or inefficiencies in present facility is not very high.
• Drawback of the working facility is that no enhancement can be made on account of removing the inefficiencies.
• If the capacity of present facility needs to be expanded, very little changes can be made possible.