A 155-MW two stage ideal reheat cycle steam power plant has the steam generator and condenser operating between the pressure limits of 89 bar and 75mm Hgabs, respectively. Steam exits the HP- turbine at 11 bar, 205 °C, exits the IP-turbine at 1.0 bar, 130°C, and exits the LP-turbine with a 7.5% moisture content. For the ideal cycle, determine: a. The temperature of steam entering the HP-turbine, IP- turbine and LP-turbine b. The percentage of the total heat supplied constituted by the first reheater c. The percentage of the total heat supplied constituted by the second reheater d. The rate of heat addition (kW) e. The rate of heat rejection (Kw f. The turbine and cycle thermal efficiencies g. The cycle and turbine steam rate (high pressure; intermediate pressure; Low pressure)

A 155-MW two stage ideal reheat cycle steam power plant has the steam generator and condenser operating between the pressure limits of 89 bar and 75mm Hgabs, respectively. Steam exits the HP- turbine at 11 bar, 205 °C, exits the IP-turbine at 1.0 bar, 130°C, and exits the LP-turbine with a 7.5% moisture content. For the ideal cycle, determine: a. The temperature of steam entering the HP-turbine, IP- turbine and LP-turbine b. The percentage of the total heat supplied constituted by the first reheater c. The percentage of the total heat supplied constituted by the second reheater d. The rate of heat addition (kW) e. The rate of heat rejection (Kw f. The turbine and cycle thermal efficiencies g. The cycle and turbine steam rate (high pressure; intermediate pressure; Low pressure)

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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1
A 60 MW power plant operates with a reheat cycle. The steam enters the turbine at 15 MPa, 590°C. The steam enters the reheater at 1.95 MPa and 280°C and exits at 1.8 MPa, 590°C. Conden pressure is. 0.0035 MPa. The steam rate is 150.000 kg/hr, and the generator efficiency is 90%. Determine the following: 1. Ideal cycle thermal efficiency without pressure drop 2. Actual cycle thermal efficiency 3. Actual combined engine efficiency 4. Enthalpy of exhaust steam (at point 4) if the heat lost through the turbine casing is 2% of the combined work.
4) In a reheat Rankine cycle, water vapor enters the high-pressure turbine at 9MPa and 450°C. It is expanded to an intermediate pressure of 0.8MPa and enters the low-pressure turbine with a temperature of 400°C. Condenser pressure is 7.5kPa and water enters the pump as a saturated liquid. There is no pressure loss in the piping that connects the cycle components. Water mass flow rate is 60 kg/s and both turbines have an isentropic efficiency of 90%. Calculate mankan kunne tħe b) net power output, in MW
A 900-MW supercritical single-reheat steam power plant operates with the main (live) steam condition of 250 bars and 560°C and the condenser pressure of 0.04 bar. The steam is reheated at a pressure of 30 bars to a temperature of 560°C. The turbine isentropic efficiency is 0.92. The feed pump work consumption may be ignored. Calculate: (a) the plant net specific work, (b) the plant thermal efficiency, (c) the plant steam flow rate, and (d) the plant heat rate.
Problem 1. Consider a vapor power plant that operates in the Simple Ideal Rankine cycle. Water vapor enters the turbine to 3 MPA and 450 ° C and is condensed in the condenser at a pressure of 15 kPa. Part 1. Diagram T-S indicating the values of the properties. Part 2. Determine: 1) the properties of State 1 (p₁; t₁; v₁; ui; hi; sı). 2) The properties of State 2 (T2; P2; V2; U2; H2; S2). 3) The pump works (wbomba) and the turbine (wurbina). 4) The heats: boiler (QH) and condenser (QL). 5) The thermal efficiency of this cycle.
My Question: In the steam plant problem#2, the reheater developed a leak and it was decided to run the plant bypassing the reheater. Determine the thermal efficiency and steam flow rate to develop the same power output.Problem 2 (In a reheat cycle steam enters the high-pressure turbine at 40 bar and 400C. It expands isentropically to 6 bar and is reheated at constant pressure to 400C. This steam is expanded isentropically in the low pressure turbine to the condenser pressure of 0.1 bar. Calculate the thermal efficiency and steam consumption for 10 MW output.)
1453 The Rankine cycle is the process widely used by power plants such as coal-fired power plants or nuclear reactors. Such a steam power plant running on Rankine cycle has steam entering HP turbine at 20 MPa, 500°C and leaving LP turbine at 90% dryness. Considering condenser pressure of 0.005 MPa and reheating occurring up to the temperature of 500°C determine, (a) The pressure at which steam leaves HP turbine (b) The thermal efficiency
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Water is the working fluid in a supercritical ideal reheat cycle. Steam enters the first-stageturbine at 320 bar, 640°C, and expands to 120 bar. After being reheated it enters thesecond-stage turbine at a temperature of 600°C, where is expands to a pressure of 0.06bar. The steam is then condensed until it is a saturated liquid.Question:Determine:(a) The thermal efficiency of the cycle(b) The back work ratio of the cycle
A power station consists of a four-unit coal fired power station, having a combined capacity of 2,880 MW. The current efficiency of each unit is around 37.7%. You are asked to improve the thermal efficiency of each unit by lowering the condenser pressure. To simplify this task, assume that each unit operates on a simple ideal Rankine cycle. If the superheated vapour enters the turbine at 10 MPa and 500 ֯C and is cooled in the condenser at a lower pressure 10 kPa, determine the quality of the steam at the turbine exit and the thermal efficiency of the cycle for one unit.
Consider a water-ammonia binary vapor cycle consisting. In the steam cycle, superheated vapor enters the turbine at 7 MPa, 450C, and saturated liquid exits the condenser at 55C. The heat rejected from the steam cycle is provided to the ammonia cycle, producing saturated vapor at 45C, which enters the ammonia turbine. Saturated liquid leaves the ammonia condenser at 1 MPa. For a net power output of 24 MW from the binary cycle, determine (a) the mass flow rates for the steam and ammonia cycles, respectively, in kg/s, (b) the power output of the steam and ammonia turbines, respectively, in MW. (c) the rate of heat input to the ammonia cycle, in MW, (d) the rate of heat addition to the binary cycle, in MW, and (e) the thermal efficiency of the binary vapor cycle.
In a steam plant 100 kg/min of dry-saturated steam at 30 bar enters the turbine. After expanding isentropic ally the exhaust steam enters the condenser. The condenser pressure is maintained at 0.1 bar by the cooling water taken from a nearby river. Calculate the following: a. Dryness fraction of exhaust steam. b. Turbine work output. c. Work input to the feed pump. d. Heat supplied to the boiler. e. Heat rejected to the cooling water. f. Efficiency of the plant. g. Net power output.