Steam power plant8/11/2023 ![]() The flue gases flow continuously on one side of the drum while air flows on the other side. Regenerative Type Air Preheater - It has slowly moving drum made up corrugated metal plates. Hence, the heat of the flue gases is transferred to the air. The flue gases are passed through the tubes and the air flows over to the tubes. Recuperative Type Air Preheater - It consists of a group of steel tubes. The air preheaters are classified into two types according to the system of transfer of the heat from flue gases to air viz − This increases the temperature of the furnace and hence increases the thermal efficiency of the power plant. The air preheater is a device which extracts heat from the flue gases and gives it to the air being supplied to the furnace for the combustion of coal. The use of economiser increases boiler efficiency, saves fuel and reduces stresses in the boiler due to higher temperature of feed water. Thus, the heat of flue gases is transferred to the feed water and hence raising its temperature. The feed water flows through these tubes and the flue gases flow outside the tubes. It consists of a large number of closely spaced parallel steel tubes connected by headers of drums. The economiser is a device which increases the temperature of feed water by driving heat from the flue gases. In case of the convection super heater, the temperature of the super heater increases with the increase in the steam output. Also, the temperature of the radiant super heater falls with increase in steam output.Ĭonvection Super-Heater - The convection super heater is the one which is placed in the tube bank of the boiler and receives heat from flue gases through the convection process. ![]() Sometimes, the radiant super-heater may get overheated due to high furnace temperature. Radiant Super-Heater - The radiant super heater is the one which is placed between the water walls and receives heat from the combustion of coal through the radiation process. These tubes are heated by the heat of flue gases during their journey from the furnace to the chimney.ĭepending upon the system of heat transfer from flue gases to steam, the super-heaters are of two types − A super heater consists of a group of tubes which are made up of special alloy steels. The use of super-heated steam increases the overall efficiency of the thermal power plant. Super HeaterĪ super-heater is a device which superheats the steam, i.e., it increases the temperature of the steam above boiling point of water. because these materials have the property to resist change of shape, weight or other physical properties at high temperatures. The walls of the boiler furnace are made up of the refractory materials such as fire clay, silica, etc. The boiler furnace provides support and enclosure for the combustion equipment. Water Tube Boiler - In a water tube boiler, water flows through the tubes and the hot gases of combustion of coal flow over these tubes.įire Tube Boilers - In a fire tube boiler, the hot gases of coal combustion pass through the tubes and the tubes are surrounded by the water.Ī boiler furnace is a chamber in which coal is burnt to liberate the heat energy. ![]() There are two types of steam boilers viz − ![]() BoilerĪ boiler is a device in which water is converted into steam by utilising the heat energy of coal combustion. In this article, we will take a look at the most important equipment of a thermal power plant. A modern thermal power plant consists of a number of necessary and auxiliary equipment. A thermal or steam power plant is a generating station which converts heat energy of coal combustion into electrical energy.
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