UNIT 2 STEAM POWER PLANT Steam Power （单元二火力发电厂蒸汽动力）.pdf

Steam Power Plant UNIT 2 STEAM POWER PLANT Structure 2.1 Introduction Objectives 2.2 Basic Consideration in the Analysis of Power Cycles 2.3 Steam Generator 2.4 Super Heater 2.5 Feed Water Heater 2.6 Furnaces 2.7 Energy Performance Assessment of Boilers 2.8 Steam Turbines 2.9 Condenser 2.10 Cooling Tower 2.11 Steam Power Station Control 2.12 Summary 2.13 Key Words 2.14 Answers to SAQs 2.1 INTRODUCTION Two important area of application of thermodynamics are power generation and refrigeration. Both power generation and refrigeration are usually accomplished by a system that operates on a thermodynamics cycle. Thermodynamics cycles can be divided into two generation categories : (a) Power Cycles (b) Refrigeration Cycles The devices or systems used to produce a net power output are often called engines and the thermodynamics cycles they operate on are called power cycle. The devices or systems use to produce refrigeration are called refrigerator, air conditioners or heat pumps and the cycles they operates on are called refrigeration cycles. Thermodynamic cycles can be categorized as : (a) Power cycles or Refrigeration cycles. (b) Gas Cycles or Vapor Cycles : In gas cycles, the working fluid remains in the gaseous phase throughout the entire cycle, where as in vapor cycles the working fluid exists in the vapor phase during one part of the cycle and in the liquid phase during another part. (c) Closed Cycles or Open Cycles : In closed cycles, the working fluid is returned to the initial state at the end of the cycle and is re-circulated. In open c