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Chapter 4.3 - Cogeneration, Turbines (Gas, Steam)

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Jawaharlal Nehru Technological University (JNTUH), Hyderabad

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Selected questions Chapter 4.3: Cogeneration, Turbines (Gas, Steam) Short type questions 1. What could be the range of energy saving potential from co-generation systems? Ans. 2. Specify the efficiency level of co-generation systems? Ans. 3. Co-generation offers energy savings in the range of 15-40% when compared against the supply of electricity and heat from conventional power stations and boilers. Cogeneration system efficiency can go up to 90% and above. Write formula for heat recovery steam generator (HRSG) efficiency, without supplementary firing? Ans. Heat recovery steam generator efficiency (%) Steam generated [ hs hw ] Mass flow of flue gas Cp x ( t in t out ) Where, hs : Enthalpy of steam, kcal/kg Steam generation in kg/h hw: Enthalpy of feed water, kcal/kg Flue as in kg/h tin : Inlet temperature of flue gas , C tout: outlet temperature of flue gas, C 4. What is the function of back pressure steam turbine ? Ans 5. Define the gas turbine efficiency? For stand alone gas turbine without heat recovery system what will be the efficiency? Ans. 6. Overall gas turbine efficiency includes two components air compressors, gas turbine. List any three energy intensive industries from designated consumes (as per EC act, 2001), where cogeneration systems are popular? Ans. 8. Turbine efficiency is the ratio of actual work output of the turbine to the net input energy supplied in the form of fuel. For stand alone gas turbines, without any heat recovery system the efficiency will be as low as35 to 40%. Name two components of energy consuming equipments in evaluating overall gas turbine efficiency? Ans. 7. In back pressure steam turbine steam enters the turbine chamber at high pressure and expands to low or medium pressure. Enthalpy difference is used for generating power/work. Fertilizer, pulp and paper, sugar. List out electrical energy parameters required while carrying out cogeneration system performance evaluation Ans. Required electrical energy parameters i) Total power generation for the trial period from individual turbines ii) Hourly average power generation iii) Quantity of power import from utility / (or DG sets) iv) Auxiliary power consumption 4.3 - Cogeneration (table format) 17

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