# Co2 Capture From Natural Gas Power Plant

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## Co2 Capture From Natural Gas Power Plant

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The set timeline is only for questions 1-5 The case study details are attached 1. Natural gas is burned in the combustor of the NGCC’s gas turbine with excess air to ensure complete combustion and to limit the temperature of the hot gas entering the turbine. In addition, liquid water is injected into the combustor to reduce the combustion temperature and increase the mass flow of gas through the turbine. Based on the fuel and flue gas compositions given, calculate: a. the excess air (in %) fed to the combustor and b. the water injection rate (in kg/hr). 2. Calculate the CO2 capture rate (kg/hr) based on 90% capture. What is the amount of CO2 captured annually (based on the plant capacity factor)? 3. Calculate the rate of work performed by the booster fan. Assume the fan is adiabatic. Find the temperature of the flue gas emerging from the fan (stream 2). 4. Calculate the cooling required in the flue gas heat exchanger and the cooling water flowrate. 5. Calculate the volumetric flowrate (m3/hr) of streams 1, 2, 3.

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{Question: 6-10 6. Calculate the flow rate (m3/hr) of liquid absorbing solution (lean solution) into the top of the absorber (stream 8) based on removal of 90% of the carbon dioxide from the flue gas. 7. Calculate the amount of water that evaporates into (or condenses from) the flue gas in the absorber. Find the moisture content and dew-point temperature of the flue gas leaving the absorber. Assume that it is in vapor/liquid equilibrium with the lean solution entering the column. 8. Assume that each absorber stage removes the same amount of carbon dioxide from the flue gas. Calculate the fraction of piperazine that is unbound, the fraction that is bound to one carbon dioxide and the fraction that is bound to two carbon dioxides in the absorber feed (stream 8), the intercooler fluid stream (stream 9) and the absorber outlet (stream 12). From this, determine the extents of Reactions 1 and 2 in each absorber stage. The reactions are given in the document “Properties of Piperazine Solutions for CO2 Scrubbing”. 9. Calculate the heat exchanged between the lean and rich solutions in the cross-heat exchanger. 10. Calculate the cooling required, and the cooling water flowrates in the lean cooler and the intercooler. Answer: Please find the attached solution. Let me know if you need anything else.}