Q4. Consider a simplified representation of the production of power from coal fired power stations: Bituminous coal (mos

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Q4 Consider A Simplified Representation Of The Production Of Power From Coal Fired Power Stations Bituminous Coal Mos 1 (433.85 KiB) Viewed 26 times

Q4. Consider a simplified representation of the production of power from coal fired power stations: Bituminous coal (most common for power in Queensland) is burned in a furnace where most of the energy liberated by the combustion reaction is transferred to a power cycle. Heat transferred to a power cycle is converted to shaft work via a power cycle. Shaft work is converted to electrical work for eth grid via a generator and transformer. ● Electrical work is transported through the grid to a home. Based on this simple representation, we are going to determine the carbon footprint of 1 MWh of electricity delivered to a household. To do this, we will assume: Step Efficiency Heat from combustion to shaft work Conversion of shaft work to electrical work in the grid 38% (based on HHV) 95% 90% Delivery of electrical work from the power plant to a household a) Draw a simple block diagram of the energy flows and transformations for power generation. Start with the heat from the coal combustion and finish with the household. You only need shaft work, electrical work, and heat as the energy transfers in your diagram. Quantify each energy transfer on your diagram to deliver 1 MWh to a household and put this on your diagram. b) What are typical ranges for the HHV for bituminous coal (in MJ/kg) and the carbon intensity of bituminous coal in terms of: ● kg CO2e per kg of coal, and ● kgCO2e per MWh (HHV) Please use high quality references for this information and reference clearly at the end of the question (not at the end of all the questions). Identify a "typical" number for kgCO2e per MWh (HHV) to use in the next question. c) What is the carbon intensity (in kgCO2e/kg) for electricity delivered to a household? Use mid-point estimates from above, and assuming that the embedded emissions for coal (i.e. pit to gate) are 20 kg CO2e per MWh (HHV) and other smaller embedded, direct and indirect emissions are about 10 kg CO2e per MWh (HHV).