In this assignment, a back pressure cogeneration plant process (see Figure 1) producing district heat (DH) and electricity will be designed based on given supply and return water temperatures and DH production. Personal initial values are listed in Appendix 1, plant and component efficiency assumptions and pressure drops are listed in Table 1. Using the given and chosen values, • determine pressure, temperature, specific enthalpy, and mass flow rate at each state point • calculate net electric power, fuel consumption, and efficiencies for electricity and CHP production • draw the process in a T,s-diagram (boiler pressure drop is assumed to occur entirely in superheaters) fuel air HPPH Boll 7 Efficiencies 6 E1 E12 Pressure drops FWP Table 1. Efficiencies and pressure losses E1 DA 5 Turbine E2 2 DHC 3 € supply return CP Figure 1. A process diagram for a back pressure CHP plant; G = generator, B = boiler, DA = deaerator (open feed heater), DHC = district heating condenser, HPPH = high pressure pre-heater (closed feed heater), CP = condensate pump, FWP = feed water pump, deaerator (open heater), Is = live steam, E = extraction. superheated steam wet steam saturated liquid subcooled liquid DH water air fuel flue gas Boiler efficiency = 0.90 Turbogenerator electromechanical efficiency 77mg = 0.98 Transformer efficiency nu = 0.99 Auxiliary power efficiency = 0.93 Turbine overall isentropic expansion efficiency n = 0.85 Feedwater pump compression efficiency FWP = 0.80 Condensate pump: enthalpy increase assumed Ahcp≈ 1 kJ/kg HP feed heater, steam side: 5 % HP feed heater, water side: 0.4 bar Boiler: 15% of live steam (state point Is) pressure Main condensate, feed water and extraction steam pipes: Ap≈ 0 Some of the initial values are given. The rest must be chosen based on lectures, material provided in Moodle, and other resources. The specific enthalpy increase Ah in preheaters must be chosen optimally for maximum process efficiency (see Lecture 2 slides and L2 example 2).

In this assignment, a back pressure cogeneration plant process (see Figure 1) producing district heat (DH) and electricity will be designed based on given supply and return water temperatures and DH production. Personal initial values are listed in Appendix 1, plant and component efficiency assumptions and pressure drops are listed in Table 1. Using the given and chosen values, • determine pressure, temperature, specific enthalpy, and mass flow rate at each state point • calculate net electric power, fuel consumption, and efficiencies for electricity and CHP production • draw the process in a T,s-diagram (boiler pressure drop is assumed to occur entirely in superheaters) fuel air HPPH Boll 7 Efficiencies 6 E1 E12 Pressure drops FWP Table 1. Efficiencies and pressure losses E1 DA 5 Turbine E2 2 DHC 3 € supply return CP Figure 1. A process diagram for a back pressure CHP plant; G = generator, B = boiler, DA = deaerator (open feed heater), DHC = district heating condenser, HPPH = high pressure pre-heater (closed feed heater), CP = condensate pump, FWP = feed water pump, deaerator (open heater), Is = live steam, E = extraction. superheated steam wet steam saturated liquid subcooled liquid DH water air fuel flue gas Boiler efficiency = 0.90 Turbogenerator electromechanical efficiency 77mg = 0.98 Transformer efficiency nu = 0.99 Auxiliary power efficiency = 0.93 Turbine overall isentropic expansion efficiency n = 0.85 Feedwater pump compression efficiency FWP = 0.80 Condensate pump: enthalpy increase assumed Ahcp≈ 1 kJ/kg HP feed heater, steam side: 5 % HP feed heater, water side: 0.4 bar Boiler: 15% of live steam (state point Is) pressure Main condensate, feed water and extraction steam pipes: Ap≈ 0 Some of the initial values are given. The rest must be chosen based on lectures, material provided in Moodle, and other resources. The specific enthalpy increase Ah in preheaters must be chosen optimally for maximum process efficiency (see Lecture 2 slides and L2 example 2).

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter2: Fundamentals

Section: Chapter Questions

Problem 2.31P: Consider two interconnected voltage sources connected by a line of impedance Z=jX, as shown in...

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