Deepakkumar Yadav
Classification of Boilers The boilers may be classified mainly as follows : Depending upon the relative position of water and flue gases : Smoke tube or fire tube boilers : In these type of boilers the hot gases or the flue gases from the furnace are passed through the tubes surrounded by the water outside … Read more
Introduction to Steam Generators or Boilers The requirement of steam as a working substance is either for power generation or for process and space heating in industrial applications. Steam generator or a boiler as per Indian boiler act 1923 is a closed pressure vessel used for generation of steam under pressure. A boiler is usually … Read more
Two Types of Air Preheater The temperature of gases leaving the economizer after heating the feed water is in the range of 250°C- 450°C. This heat energy in exhaust gases can be further utilized to preheat the surrounding air before supplied to combustion chamber. After transfer of heat to air, these gases are finally discharged … Read more
Superheaters The superheater is a heat exchanger whose function is to superheat the wet or saturated steam upto desired temperature by transfer of heat energy. The superheaters are either located in the passage of hot flue gases or directly over the furnace depending upon its design and application. In modern steam power plants, the superheating … Read more
Fluidized Bed Combustion Boilers (FBCB) Figure A Minimum fluidization velocity of air was defined the velocity of air needed at which the mixture of fuel and air starts behaving like a fluid and the burning of the fuel in such state was called fluidized bed combustion boilers. We shall now discuss the classification and working … Read more
Economisers An economizer is an heat exchanger which is used to raise the temperature of feed water with the help of waste heat energy of gases before it is supplied to the boiler. Note that the temperature of gases is about 350°C 550°C at exit of last heater/ superheater having large amount of heat energy … Read more
Methods of Superheat Temperature Control For proper and efficient operation of power plant it is essential to control the temperature of steam according to load on the power plant. The reduction of about 20°C temperature of superheated steam causes the increase in 1% heat rate (H.R.) [H.R.-Work output x 3600 Efficiency (kJ / kWh) my] … Read more
Reheaters Figure A Reheaters are used in between the stages of turbine to reheat the steam so as improve overall efficiency of plant and to avoid low dryness fraction of steam in later stages of turbine. Therefore, the basic concept and design is similar to superheater except that these operate comparatively at lower pressures and … Read more
Basic Arrangement of FBC System Advantages and Disadvantages The basic arrangement of FBC system is represented in Figure. It consists of a shell with a distributor plate at its bottom with holes in it. The shell carries the boiler evaporator tubes which remain immersed in the fluidized bed as shown in figure. Coal of 6 to … Read more
Principle of Operation of Fluidized Bed Combustion System Figure A shows the simple fluidized bed which has a finely divided particles of fuel half filled in the column. At its bottom a distributor plate is fitted through which the air is passed in upward direction with some low velocity. The pressure drop across the combustion … Read more