A new coal-fired power plant with a heat rate of 9000 Btu/kWh bums coal with an

Question

A new coal-fired power plant with a heat rate of 9000 Btu/kWh bums coal with an energy content of 24,000 kJ/kg. The coal content includes 62-% carbon. 2-% sulfur and 10-% unburnable minerals called ash. What will be the carbon emission rate (g C/kWh)? What will be the uncontrolled sulfur emission rate (g S/kWh)? If 70% of the ash is released as particular matter from the stack (called fly ash),  what would be the uncontrolled particulate emission rate (g/kWh)? Since the Clean Air Act restricts SO? emissions to 130 g of sulfur per 10^6 kJ of heat into the plant, what removal efficiency does the scrubber need to have for this plant? What efficiency does the particulate removal equipment need to have to meet the Clean Air Act standard of no more than 13 g of fly ash per 10^6 kJ of heat input? Using the representative capital costs of power plant and fuels given in Table 3.3, compute the cost of electricity from the following power plants. For each, assume a fixed charge rate of 0.14/yr. Pulverized coal steam plant with capacity factor CF = 0.7. Advanced coal steam plant with CF = 0.8. Oil/gas steam plant with CF = 0.5. Combined cycle gas plant with CF = 0.5. Gas-fired combustion turbine with CF = 0.2. SIGT gas turbine with CF = 0.4. New hydroelectric plant with CF = 0.6. Wind turbine costing $800/kW, CF = 0.37, O&M; = 0.60c/kWh A 345 kV, three-phase transmission system uses 0.642-in. diameter ACSR cable to deliver 200 MW to a wye-connected load 100 miles away. Compute the line losses if the power factor is 0.90.

Explanation / Answer

3.11)Given condition,0.642 inch ACSR conductor run 100 miles to deliver 100 MW at 345 kV level.

By using P = 1.732*345*I*0.9;

I = 371.895 amps.

For 0.642 inch ACSR conductor, resistance is 0.0779 ohm/1000 feet and considering negligible inductance from the tech sheet.

Hence net resistance 'R' = 0.0779*100*5280/1000 ohm(1 mile = 5280 ft.)

R = 41.132 ohm

Then line losses = I^2*R = 5.6887 MW.

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