A waste heat recovery boiler produces 4.8 Mpa (dry saturated) steam from 104 C feedwater. The boiler receives energy from 7 kg/sec of 954 c dry air. After passing through a waste heat boiler, the temperature of the air is has been reduce to 343 °C. How much steam in kg is produced per second? Note: At 4.80 Mpa dry saturated, h = 2796. c. 1.81 d. 3.43 а. 1.30 b. 0.92 Answer: C PPO A9 2020

A waste heat recovery boiler produces 4.8 Mpa (dry saturated) steam from 104 C feedwater. The boiler receives energy from 7 kg/sec of 954 c dry air. After passing through a waste heat boiler, the temperature of the air is has been reduce to 343 °C. How much steam in kg is produced per second? Note: At 4.80 Mpa dry saturated, h = 2796. c. 1.81 d. 3.43 а. 1.30 b. 0.92 Answer: C PPO A9 2020

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

See similar textbooks

Similar questions

Q1 : In a steam power plant , steam enters at 8 MPa and 700 C , the condenser pressure is 8 kPa , and the net power out of the plant is J100MW . Determine enthalpy and entropy at point 1, dryness frection , and enthalpy and entropy at point 2 , enthalpy and entropy at point 3 , work torbine , work net , Qadd to boiler , thermal efficency for cycle , Q rejeted from condenser , mass flow rate of steam , Q rejeted from condenser
2. A waste heat recovery boiler produces 4.8MPa (dry saturated) steam from 103 deg C feedwater. The boiler receives energy from 6 kg/s of 945 deg C dry air. After passing through a waste heat boiler, the temperature of the air has been reduced to 343 deg C. How much steam in kg is produced per second? (Hint: Approximate Enthalpy of Water in kJ/kg = Cp(t); where t is in 0C) @4.8 MPa dry saturated: h = 2796 A. 1.8 C. 1.53 B. 2.98 D. 1.54
A turbine is driven by a system that enters the turbine at the ff. conditions: 500 kg/h, 44 atm, 450 deg C, 60 m/s linear speed. The steam exits at a point five meters below the inlet stream of the turbine with the following conditions: atmospheric pressure, 360 m/s speed. 70,000 W of shaft work is delivered by the turbine while 104 kilocalories/h heat is lost. Here are the questions to be answered: 1. Why is the value of Wexp 0? (Explain) 2. Given the above values, can you calculate the Wflow? (Yes/No)
Refriegerant ammonia enters the compressor of a refriegerant as a superheated vapor at 0.14 MPa, -20 °C at a rate of 0.04 kg/s, and leaves at 0.8 MPa, 50 °C. The refriegerant is cooled in the condenser to 0.75 MPa and is throttled to 0.14 MPa. Disregarding any heat transfer and pressure drops in the connecting lines between components, determine:a) the rate of heat removal from the refriegerated space in kWb) the power input to the compressor in KWc) the COP pf the cycle
A steam generator comprises a boiler, a superheater, an economizer, and an air preheater. The feedwater enters the economizer at 140 oC and leaves the boiler drum at 60 bar, 0.98 dries, and leaves the superheater at 450 oC. When using coal with a calorific value of 25.2 MJ/kg, the rate of evaporation is 8.5 kg steam per kg coal and the air-fuel ratio is 15:1 by mass. Neglecting heat losses and pressure drops, estimate the heat transfer per kg fuel in each component and the efficiency of the steam generator. What are the percentages of the total heat absorption taking place in the economizer, boiler, and superheater, respectively? Assume Cp of air and water as 1.005 and 4.2 kJ/kg-K, respectively.
An open-cycle gas turbine plant will exhaust into a waste heat boiler which receives 66 0C feedwater. The gas turbine plant produces 2611 kW. Air flow rate is 37 kg/kW-hr. Fuel rate, rf/a = 0.014 kg fuel/kg air. Actual exhaust gas temperature = 483 0 Average exhaust gas Cp = 1.082 kJ/kg.K. Compute the saturated steam at 0.450 MPa that can be produced per hour, assuming that the final gas temperature is 38 0C above the saturation temperature.
Q22(i) Construct the flow chart (diagram) and compute the total heat required to convert 900 g of ice at –30°C to steam at 145 °C. (Cice = 2090 J/kg.°C, Cwater = 4186 J/kg.°C, Csteam = 2010 J/kg.°C, Lf = 3.33 × 105 J/kg, Lv = 2.26 × 106 J/kg.)
Steam at 40 bar, 500oC flowing at the rate of 5500 kg/h expands in a h.p. turbine to 2 bar withan isentropic efficiency of 83%. A continuous supply of steam at 2 bar, 0.87 quality and a flowrate of 2700 kg/h is available from a geothermal energy source. This steam is mixed adiabaticallywith the h.p. turbine exhaust steam and the combined flow then expands in a l.p. turbine to 0.1 barwith an isentropic efficiency of 78%. Determine the power output and the thermal efficiency ofthe plant. Assume that 5500 kg/h of steam is generated in the boiler at 40 bar, 500 oC from thesaturated feedwater at 0.1 bar.Had the geothermal steam not been added, what would have been the power output and efficiencyof the plant? Neglect the pump work.
An open-cycle gas turbine plant will exhaust into a waste heat boiler which receives 66 0C feedwater. The gas turbine plant produces 2611 kW. Air flow rate is 37 kg/kW-hr. Fuel rate, rf/a = 0.014 kg fuel/kg air. Actual exhaust gas temperature = 483 0C. Average exhaust gas Cp = 1.082 kJ/kg.K. Compute the saturated steam at 0.450 MPa that can be produced per hour, assuming that the final gas temperature is 38 0C above the saturation temperature. Show the necessary diagrams.
2. Consider a reheat cycle utilizing steam. Steam leaves the boiler and enters the turbine at 4 MPa, 400 °C. After expansion in the turbine to 400 kPa, the steam reheated to 400 °C and then expanded in the low-pressure turbine to 10 kPa. Determine the cycle efficiency, in percent.
A 1000-MW supercritical double-reheat steam power plant operates withthe main (live) steam condition of 250 bars and 560°C and the condenserpressure of 0.04 bar. The steam is reheated first at 30 bars to 560°C andthen at 4 bars to 560°C. The turbine efficiency is 0.92. The feed pumpwork may be ignored. Calculate: (a) the plant net specific work, (b) the plant thermal efficiency, (c) the plant steam mass flow rate, and (d) the plant heat rate.
A reheat cycle with two stages of reheating is executed with steam expanding initially from 25 MPa and 600 °C. The two reheater pressures are 4 MPa and 1 MPa, and the steam leaves each reheater at 600 °C. Condensation occurs at 40°C. For 1 kg/s of steam, what is QA in kW? Remember, 1. For values taken from the steam tables: Use them as is, do not round off. 2. For values obtained by interpolation and final answers obtained by solving, use FOUR (4) decimal places. 3. Use the steam tables provided