Steam is supplied to a two-stage turbine at 40 bar and 350°C. It expands in the first turbine until it is just dry saturated, then it is re-heated to 350°C and expanded through the second-stage turbine. The condenser pressure is 0.035 bar. Calculate the work output and the heat supplied per kilogram of steam for the plant, assuming ideal processes and neglecting the feed-pump term. Calculate also the specific steam consumption and the cycle efficiency.

Steam is supplied to a two-stage turbine at 40 bar and 350°C. It expands in the first turbine until it is just dry saturated, then it is re-heated to 350°C and expanded through the second-stage turbine. The condenser pressure is 0.035 bar. Calculate the work output and the heat supplied per kilogram of steam for the plant, assuming ideal processes and neglecting the feed-pump term. Calculate also the specific steam consumption and the cycle efficiency.

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

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.
Steam is supplied to a two-stage turbine at 40 bar and 350 oC. It expands in the first turbine until it is just dry saturated, then it is reheated to 350 oC and expanded through the second stage turbine; the isentropic efficiencies of the first and second stage turbines are 84 % and 78 % respectively. The condenser pressure is 0.035 bar. Sketch the process on a T-s diagram and calculate;The work output and heat supplied per kg of steam for the plant assuming ideal processesThe thermal efficiency of the cycleThe specific steam consumption
A steam turbine cycle running on a Rankin cycle between the condenser pressure of 10 kPa and the boiler pressure of 165 bar, the steam enters the high pressure turbine at a temperature of 600 ° C. The average turbine expands to 800 kPa and then enters the boiler again to be reheated to 550 ° C. The steam leaves the boiler to a low pressure turbine, where it expands to the condenser pressure. If the expansion and compression in the turbine and the pump is isotropic, and the addition of heat is constant pressure, find the efficiency of the cycle. Note point # 1 at the exit area of the steam from the boiler
Below is a schematic diagram of a simple steam power plant. Steam is heated inside an isobaric boiler and enters the turbine at 1 MPa and 300⁰C. It exits the turbine at 500 kPa, saturated vapor. The steam is then cooled down to saturated liquid at 500 kPa by cooling water flowing in at 35 ⁰C and out at 85 ⁰C of the condenser. The needed power of the pump is 11.071 MW. The steam is pumped into a throttling device back to the boiler. The mass flow rate of steam circulating the condenser is 100 kg/s. Determine the following: a. Turbine work in MW b. Heat rejected from the condenser in MW c. Mass flow rate of cooling water in kg/s d. Inlet boiler temperature in ⁰C e. Heat added in the boiler in MW
A steam turbine cycle running on a Rankin cycle between a condenser pressure of 10 kPa and a boiler pressure of 20 MPa, the steam enters the high pressure turbine at a temperature of 600 ° C. The average turbine expands to 800 kPa and then enters the boiler again to be reheated to 500 ° C. The steam leaves the boiler to a low pressure turbine, where it expands to the condenser pressure. If the expansion and compression in the turbine and the pump is isotropic, and the addition of heat is constant pressure, find the efficiency of the cycle. Note point # 1 at the vapor exit region of the condenser
Steam turbine receives steam at 9.5 MPa, 540°C and the condenser at 0.01 MPa. Steam are extracted at 3 MPa, 1.8 MPa, and 0.6 MPa. Determine the following: 1. Degree superheat at point 2 2. Quality of steam at point 4 3. Mass extracted in kg/hr for each feedwater open heater and the remaining mass that enters the condenser assuming 20,000 kg/hr of throttle flow 4. Work net in kW 5. Cycle thermal efficiency
Steam is supplied to a two-stage turbine at 40 bar and 350 o It expands in the first turbine until it is just dry saturated, then it is reheated to 350 oC and expanded through the second stage turbine; the isentropic efficiencies of the first and second stage turbines are 84 % and 78 % respectively. The condenser pressure is 0.035 bar. Sketch the process on a T-s diagram and calculate; i. The work output and heat supplied per kg of steam for the plant assuming ideal processes ii. The thermal efficiency of the cycle iii. The specific steam consumption
A steam power plant operating on a regenerative cycle, as illustrated in Fig. 8.5, includes two feedwater heaters. Steam enters the turbine at 6500 kPa and 600°C and exhausts at 20 kPa. Steam for the feedwater heaters is extracted from the turbine at pressures such that the feedwater is heated to 190°C in two equal increments of temperature rise, with 5°C approaches to the steam-condensation temperature in each feedwater heater. If the turbine and pump efficiencies are each 0.80, what is the thermal efficiency of the cycle, and what fraction of the steam entering the turbine is extracted for each feedwater heater? kindly answer it with full explanation of the solution, thankyou
Steam is supplied to a two-stage turbine at 140 bar and 400C. It expands isentropic ally until it is just dry-saturated. Then it is reheated to 350C at constant pressure and expanded in the second-stage turbine to the condenser pressure of 0.2 bar. If the isentropic efficiency of the second stage is 78%. Calculate the specific steam consumption and the thermal efficiency.
A 330 MW steam power plant operates according to the simple ideal Rankine cycle. Water vapor enters the turbine at a pressure of 10 MPa and a temperature of 525 ° C and expands to a condenser pressure of 15 kPa. Show the cycle in a T-s diagram with the saturated liquid and saturated vapor curves and calcualte the; a)The degree of dryness of the steam at the turbine outlet. b)Thermal efficiency of the cycle. c)The mass flow of water vapor circulating in the cycle.
Steam leaves the boiler of a steam power plant at 400°C and 4MPa. The pressure of the condenser is 10 kpa/ What is the enthalpy (in kJ/kg) at the condenser inlet if the isentropic efficiency of the turbine is 78%?
In a combined heat-power plant with intermediate steam intake, steam enters the turbine at 7 MPa, 500°C at a flow rate of 28.7 kg/s and expands to a pressure of 0.4 MPa. At this pressure, 0.59 percent of the steam leaves the plant and the remaining steam expands to a pressure of 10 kPa. Some of the separated steam is used to heat the feedwater in an open feedwater heater. The remainder of the separated steam is used for heat treatments and exits the process heater as a saturated liquid at a pressure of 0.4 MPa. The exiting saturated liquid is then mixed with the feedwater from the feedwater heater and the mixture is pumped to the boiler pressure. Calculate the flow rate (kg/s) through the process heater using the enthalpy values given in the figure.