In a large steam power plant, the combustion of coal provides a heat rate of -...
The condenser of a large steam power plant is a heat exchanger in which steam is condensed to liquid water. Assume the condenser to be a shell-and-tube heat exchanger consisting of a single shell and 30,000 tubes, each executing two passes (see figure below). The tubes are of thin wall construction with D=25mm, and steam condenses on their outer surface with an associated convection coefficient ho=11,000W/ m K The heat transfer rate that must be effected by the heat exchanger...
A steam power plant is intended to be used for heating as well as power generation. The net power required from this installation is 5 MW and the heating power is 12 MW. While the steam produced at 4 MPa, 440 degrees Celsius in the boiler expands in the isentropic turbine, the steam to be used in heating is drawn from the turbine at 140 kPa and it is condensed in the heating installation and mixed with water from the...
PROBLEM 3 (45 points) The condenser of a large steam power plant is a heat exchanger in which steam is condensed to liquid water. Assume the condenser to be a parallel flow shell-and-tube heat exchanger consisting of a single shell and 1x10 tubes, each executing two passes. The inner diameter of tubes is D = 50 mm and its thickness is 5 mm (Do not ignore the thickness). The steam condenses on their outer surface. Thermal conductivity of the tube...
A Rankine Cycle based steam power plant produces 200 MW of power. Steam exits the boiler at 3 MPa and 500° C. The turbine exit is at 40 kPa. Isentropic efficiencies of the turbine and pump are 75% and 70% respectively. Show the cycle on a T-s diagram Calculate the mass flow rate of steam Determine the heat transfer rates in the boiler and condenser in MW Determine the cycle efficiency Determine the mass flow rate of the condenser cooling...
Problem 3 The condenser of a large power plant is to remove condensing at 30° C (hg-2430 kJ/ 500 MW of heat from steam kg). The cooling is to be accomplished by C and leaves w g eC) from a nearby river, which enters the tubes at diameter of 2 cm, and the overall heat transfer coefficient is 3500 W/m c. Determine the total length of the tubes required in the condenser heat exchanger is suitable for this task? es...
The condenser downstream of the turbine in a large Rankine cycle power plant is constructed of 30,000 25-mm tubes. The steam condenses at 50 ºC with a heat transfer coefficient of 9,000 W/m2 ·K on the outside the tubes. The cooling water enters the tube side of the condenser at 20 ºC at a flow rate of 17,000 kg/s. For a 1000 MW (net) power output and a cycle thermal efficiency of 42%, determine: a. the cooling rate required (in...
Problem 3. (25 points) In a Rankine power system, 1.5 kg/s of steam leaves the turbine as saturated vapor at 0.51 bar. The steam is condensed to saturated liquid by passing it over the tubes of a shell-and-tube heat exchanger, while liquid water, having an inlet temperature of T = 280 K, is passed through the tubes. The condenser contains 100 thin-walled tubes, each of 10-mm diameter, and the total water flow rate through the tubes is 15 kg/s. The...
Section C – shell and tube heat exchanger sizing The vapour condenser for the combined gas-steam power cycle described in Section B heats river water from 15 °C to 18 °C. The condenser is a shell and tube heat exchanger with one shell pass and two tube passes. The cooling water is inside the tubes while the shell side has the condensing vapour. More details: a. The tube OD is 1 ¼” (inches), the tube wall thickness is 0.05 inches....
Consider a coal-fired steam power plant that produces 175 MW of electric power. The power plant operates on a simple ideal Rankine cycle with turbine inlet conditions of 8 MPa and 560°C and a condenser pressure of 8 kPa. The coal has a heating value (energy released when the coal is burned) of 29,300 kJ/kg and a CO2 emission value of 0.093 kg CO2/MJ. Assuming that 85% of this energy is transferred to heat in the boiler and that the...
A steam power plant is based on the Rankine cycle with reheat (refer to the figure below). Steam is produced by the boiler/superheater (H-1) at 100 bar and 600 C at a rate of 2.5 kgs. This is expanded to 10 bar in the turbine T-1 and then reheated to 600 °C in heater H-2. The steam is then expanded in turbine T-2 to a pressure of 0.1 bar. The steam is then condensed in condenser (C-1) which operates at...