Tweet Almost two third of electricity requirement of the world is fulfilled by thermal power plants or thermal power stations. In these power stationssteam is produced by burning some fossil fuel e.
First the pulverized coal is burnt into the furnace of steam boiler. High pressure steam is produced in the boiler. This steam is then passed through the super heater, where it further heated up.
This supper heated steam is then entered into a turbine at high speed. In turbine this steam force rotates the turbine blades that means here in the turbine the stored potential energy of the high pressured steam is converted into mechanical energy. Line Diagram of Power Plant After rotating the turbine blades, the steam has lost its high pressure, passes out of turbine blades and enters into a condenser.
In the condenser the cold water is circulated with help of pump which condenses the low pressure wet steam.
This condensed water is then further supplied to low pressure water heater where the low pressure steam increases the temperature of this feed water, it is then again heated in a high pressure heater where the high pressure of steam is used for heating.
The turbine in thermal power station acts as a prime mover of the alternator. The working fluid is water and steam. This is called feed water and steam cycle.
In a steam boiler, the water is heated up by burning the fuel in the air in the furnace, and the function of the boiler is to give dry superheated steam at the required temperature.
The steam so produced is used in driving the steam Turbines. This turbine is coupled to synchronous generator usually three-phase synchronous alternatorwhich generates electrical energy.
The exhaust steam from the turbine is allowed to condense into water in steam condenser of turbinewhich creates suction at very low pressure and allows the expansion of the steam in the turbine to very low pressure. The principal advantages of the condensing operation are the increased amount of energy extracted per kg of steam and thereby increasing efficiency, and the condensate which is fed into the boiler again reduces the amount of fresh feed water.
The condensate along with some fresh makeup feed water is again fed into the boiler by a pump called the boiler feed pump. In the condenser, the steam is condensed by cooling water. Cooling water recycles through the cooling tower. This constitutes a cooling water circuit.
The ambient air is allowed to enter the boiler after dust filtration. Also, the flue gas comes out of the boiler and gets exhausted into the atmosphere through stacks. These constitute air and flue gas circuit. The flow of air and also the static pressure inside the steam boiler called draught is maintained by two fans called Forced Draught FD fan and Induced Draught ID fan.
The total scheme of a typical thermal power station along with different circuits is illustrated below. Inside the boiler there are various heat exchangers, viz.
Economiser, Evaporator not shown in the fig above, it is basically the water tubes, i. In Economiser the feed water is heated to a considerable amount by the remaining heat of flue gas.
There is also Super Heater which also takes heat from flue gas and raises the temperature of steam as per requirement.
Efficiency of Thermal Power Station or Plant Overall efficiency of steam power plant is defined as the ratio of heat equivalent of electrical output to the heat of combustion of coal.Coal: In a coal based thermal power plant, coal is transported from coal mines to the generating station.
Generally, bituminous coal or brown coal is used as fuel.
The coal is stored in either 'dead storage' or in 'live storage'. Dead storage is generally 40 days backup coal storage which is used when coal supply is unavailable. Find thermal power plant Stock Images in HD and millions of other royalty-free stock photos, illustrations, and vectors in the Shutterstock collection.
Thousands of new, high-quality pictures added every day. 70 Vol. 51 No. 3 FUJI ELECTRIC REVIEW Hiroshi Nishigaki Trends and Future Outlook for Thermal Power Plants 1. Introduction Recent events have caused modern society to appreciate anew the benefits it derives from electricity.
This page is about Thermal Power Generation Plant or Thermal Power Station. The page includes line diagram, efficiency, advantages, and disadvantages of Thermal Power Station/5(3). Thermal power generation plant or thermal power station is the most conventional source of electric srmvision.coml power plant is also referred as coal thermal power plant and steam turbine power srmvision.com going into detail of this topic, we will try to understand the line diagram of electric power generation plant.
Theory of Thermal Power Station/5(11). Jul 10, · Thermal power plants are power stations which convert heat energy into electric srmvision.coml power plant is a collective term which includes fossil fuels, geothermal, solar and nuclear power plants as well as waste incineration plants.