Q3/a steam power plant of a 25-MW electric output power has a medium water tube steam generator ofthe following specificationsSteam productionSteam pressureSteam temperatureDryness fraction of steam in the steam drumFeed water temperature from F.W.HsWater leaving economizerFuel :natural gas of heating valueFuel consumptionPercent of unburned fuelFlue gas flow rateFlue gas temperatureFlue gas specific heat31.6kg/s60bar500 °C0.96100 °C250°C38700 kJ/m2.85 m³/s3%22.67%)12.8 kg/s150°C1.008 kJ/kg.K30°CAmbient temperature1. Determine the boiler efficiency and the equivalent evaporation.2. Draw the heat balance sheet for the boiler(all in kW).3. Determine the overall efficiency for this plant.Answ(86%,14.75kg steam/m3 fud, Ece-19908kW, E-52835kW, Ep 22050kW, Eest-1548.3kW,

At 60 bar and 500°C, the steam is in a superheated state, and the specific enthalpy is H=3421.77…

Answered: Q3/a steam power plant of a 25-MW…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Task 1 : Investigate the principles of operation of the used part of the gas turbine plant (Brayton Cycle). Task 2: Calculate the produced power of the used gas turbine system then assess its efficiency. Task 3: If the compressor and turbine isentropic efficiencies are 88% and 75 %, respectively, compare and evaluate the actual plant and theoretical efficiencies in the used single shaft gas turbine system.
Based on the steam engine represented on the following figure, a) Describe the heat engine cycle and explain why it is useful. b) Describe the energy conversions that occur.
Instructions: Perform a cycle analysis for the given reheat-regenerative Rankine cycles. Supply the table with the necessary equations based on enthalpy and mass fraction of working fluid’s state points. Derive the equations by analyzing the processes plotted in the T-s diagram. Show that the derived equations from T-s diagram analysis are consistent with the derivations by Energy Balance method. You may sketch the individual component to visualize your energy balance process.
Q2) The following data relate to a regenerative steam power plant generating 22500 kW energy, the alternator directly coupled to steam turbine : Condition of steam supplied to the steam turbine 60 bar, 450 degrees * C Condenser vacuum ... 707.5 mm Pressure at which steam is bled from the steam turbine ... 3 bar Turbine efficiency of each portion of expansion ... 87 per cent Boiler efficiencyper cent Alternator efficiency ... 94 per cent Mechanical efficiency from turbine to generator ... 97 per cent Neglecting the pump work in calculating the input to the boiler, determine (i) The steam bled per kg of steam supplied to the turbine. (ii) The steam generated per hour if the 9 percent of the generator output is used to run the pumps. (iiiThe overall efficiency of the plant.
Q3// A 3-MW steam power plant have a water tubes boiler of the following specification: Steam production 9000 kg/h Steam pressure 15 bar Steam temperature 300 "C Dryness fraction of steam in the steam drum 0.9 Feed water temperature 313K Water leaving economizer heating value of the fuel Fuel consumption Flue gas temperature Flue gas density Flue gas specific heat Boiler house temperature 115 "C 31 MJ/kg 1000 kg/h 160 "C 1.15 kg/m³ 1.11 kJ/kg.K 20 "C 1.24 m Chimney diameter Velocity of flue gases leaving the chimney 3 m/s 1. Determine the overall efficiency, boiler efficiency, and equivalence evaporation. 2. Draw the heat balance sheet for the boiler (all in kW). 3. State the requirements of good steam generator. Answ(83.35%, 11.45kgs/kgf, 34.84%, 8611.11kW, 787.5kW, 5280.7kW, 1109.05kW, 647.4kW)
3. For the gas system power illustrated in Figure 3 (with the air-standard analysis assumptions), calculate thermal efficiency, back work ratio, and Weycle -10 P₁ = 100 kPa T₁ = 350 K Oia Heat exchanger Heat exchanger Qout T₁ - 1500 K Turbine Wycle 1 T₁ - 1500 K p= 1000 kPa p= 100 kPa T₁ = 350 K Figure 3. Operating condition of a gas power system cycle (The P-V and T-S diagram)
1. Consider the following schematic of a power plant (operating in what is called a 'Rankine Cycle') Turbine Steam generator Condenser Coling water Economiaer The power plant control room reports that the plant is operating continuously at the following peak load conditions: a. Power to pump = 300KW b. Rate of steam flow = 25 kg/s c. Cooling water temperature at condenser inlet = 13 C d. Cooling water temperature at condenser outlet = 34 C Additionally, the following measurements were made at various points in the piping connecting the power plant components Data Pressure Temp. Quality enthalpy Specific Velocity (kJ/kg) point (kPa) volume (m/s) (m3/kg) (C) (x) 1 6200 2 6100 43 5900 177 ---- 4. 5700 493 ----- 5 5500 482 ----- 6 103 0.94 183 7 96 43 -----
List the flows of mass and energy located in there
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Problem 2: Win High-pressure liquid water (Pump Boiler Condenser à out Low-pressure liquid water FIGURE 7-1 Example of a power cycle. High-pressure steam 3 Turbine Wout Low-pressure superheated vapor or high-quality two-phase mixture A simple steam power cycle consists of a boiler, turbine, condenser, and pump as shown in the sketch above. All the heat removal in the cycle is done by the condenser which transfers the heat to pipes carrying cooling water. The cooling water has a mass flow rate of 7 kg/sec, and a specific heat of 4,180 J/kg-°C. The cooling water is supplied at a temperature of 10 °C and exits at 20 °C. Heat is supplied to the cycle through a steam boiler at a rate, Ċin = 420 kW. Find the following: a. The rate at which heat is rejected from the cycle to the cooling water, Qout- b. The net power produced in kilowatts, Wnet- c. The cycle efficiency, cycle.
A geothermal resource/aquifer has been tested and confirmed to continuously produce saturated liquid water at 230°C. It is desired to construct a 60 MW geothermal power plant, which will utilize this resource. Two designs are proposed: a) a single flash unit and b) a dual-flash unit. A nearby cooling pond may supply sufficient cooling water to keep the condenser of the plant at 40°C. For the two types of units under consideration calculate: a) The total amount of steam that needs to be produced. b) The total amount of water the wells must provide. c) If each well produces 60 kg/s of water, what is the number of wells that must be drilled?

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