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Electronic (Analog) Control Systems
Published in Norman A. Anderson, Instrumentation for Process Measurement and Control, 2017
9-15. A boiler delivers 50,000 pounds of steam per hour. The steam pressure is 750 psi (5,171 kPa) and the temperature is 510°F (266°C). The feedwater pump delivers water at 900 psi (6,206 kPa). The size of the linear globe valve controlling feedwater should be: (Hint: A pound of water makes a pound of steam.) 4 inches2 inches1 inch¾ inch
Force-System Resultants and Equilibrium
Published in Richard C. Dorf, The Engineering Handbook, 2018
The condensate at 3 (in Figure 71.1) is returned to the cycle to be converted to steam for reentry to the turbine at 1. Called the feedwater, it is pumped by condensate and feedwater pumps - to overcome flow pressure losses in the feedwater system and the steam generator - and enters the turbine at the desired pressure. The feedwater is heated successively to a temperature close to the saturated temperature at the steam generator pressure. This process, called regeneration or feedwater heating, results in marked improvement in cycle efficiency and is used in all modern Rankine cycle power plants, both fossil and nuclear.
Identification of Working Conditions in Secondary Loop of Nuclear Power Plant Based on Improved Multiple PCA Modeling
Published in Nuclear Science and Engineering, 2020
Yunfeng Zhang, Xiangshun Li, Lin Cai
In the secondary loop, the hot steam in the SG goes into the main steam pipe. The hot steam from the main steam pipe is distributed to high steam turbines and drives the rotors to rotate. The rotor then drives the shaft of the propeller to rotate. Heat energy is converted into mechanical energy. The hot steam from the high steam turbine goes into a moisture separator reheater to remove the water vapor to avoid corroding the blades in the low steam turbine. Then the hot steam goes into the low steam turbine to drive the rotor to rotate. The exhausted steam is condensed in the condenser by sea water. The condensed water is pumped to the low-pressure feedwater heater by the condenser pump and is heated by the hot steam coming from the low steam turbine. Then the water goes into a deaerator and is heated by the hot steam coming from the main steam pipe and high steam turbine. At the same time, oxygen is removed to avoid the corrosion of the SG. The heated water is pumped by the feedwater pump to the high-pressure feedwater heater to be heated by the hot steam coming from the main steam pipe and high steam turbine. Finally, the water goes into the SG and absorbs heat to produce steam. The above process constitutes the cycle of the secondary loop of an NPP.