how a steam boiler works ,its machinery and safety gadgets attached -please explain
Coal fired steam boiler is wide range used. Especially it is usually used in electric power plant. Do you know how coal fired boiler works in electric power plant? Coal is densely compressed ancient plant matter. It's like a naturally made barbecue charcoal. It is a solid fuel. It has a long history that people use it. The coal is mined and brought to a power plant in large quantities by trucks and trains. It is stacked up with large equipment, like bulldozers, and feed onto conveyor belts. The conveyor belt dump the coal chunks into a grinder, or crusher, which makes fairly uniform sized of coal powder. This powder is fed into a combustion where it is ignited and as the coal if fed into the combustion it's burning become self-sustaining. There is a lot of air being blown through the combustion and flow of this air is the oxygen for the burning of the coal and transfers the heat from the combustion to the coal fired boiler. The temperatures of this 'flue gas' is over 2000 degrees fahrenheit. In the boiler of coal fired the section of the power plant is water flowing through tubes. As the heat passes across the outer portion of the tubes it transfers heat to the water and the water boil. A continuous flow of water is fed through these tubes. Once the water is boiled to steam and a pressure of steam develops. The steam is directed, through piping, to a steam turbine. The steam turns the turbine. Connected to the turbine is an electric generator. As the turbine turns the generator electricity is produced and is directed to the power grid and eventually to your house and school. This is a very simplified version, but covers the major steps of how a coal fired boiler work in electric power plant. I hope this can help you.
Most larger boilers today consist of a furnace that is made of steel tubes surrounding an empty space. The space is where the fire burns, from coal oil, natural gas, etc., heating water inside the tubes to the operating temperature and pressure of the boiler. Many boilers have a drum where the mixture of steam and boiler separate, and then the water is returned to the furnace zone to be be heated again. Beyond that, boilers auxiliary have vastly different equipment depending on the type size and fuel that is being used. Pumps to circulate water and fans to move air and flue gas are the major types. As far as safety is concerned, they all will have safety valves, they are required by a code in most places to keep the pressure from building up too much and exploding the boiler, potentially harming people working around them.
