Solid Fuel Fired Steam Boilers are machines that utilize the heat generated from the combustion of solid fuels (such as coal, wood, waste materials) to transition water from a liquid phase to a gaseous phase in a controlled manner. They are devices used to produce steam by applying thermal energy to water. Steam boilers are systems that enable the heating of water to induce its vaporization.
The design of steam boilers is determined by fuel types and operating pressures.
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The working principle of solid fuel fired steam boilers is based on the combustion and heat transfer processes that take place in the combustion chamber. The heat released during combustion heats water, causing it to vaporize and generate steam for energy transfer. Here is the basic working principle of solid fuel fired steam boilers:
Solid Fuel Feeding: Suitable-sized solid fuel is fed into the combustion chamber of the steam boiler. These fuels are usually derived from natural sources such as coal or wood.
Combustion Chamber: The fuel is burned in the combustion chamber under controlled airflow. This chamber provides the necessary oxygen for combustion, and the burning process occurs here.
Heating Surfaces: The hot gases produced by combustion are directed to the heat transfer surfaces inside the boiler. These surfaces can be in the form of pipes or plates through which water flows.
Transfer of Heat to Water: The hot gases come into contact with the water surrounding the heating surfaces. This contact results in an increase in water temperature.
Vaporization: The heated water begins to vaporize. Water molecules transform into steam as they reach the point of vaporization.
Steam Formation: Water molecules in the process of vaporization separate from the water surface, forming steam that gathers above the water level.
Steam Collection: The steam produced gathers in a collection chamber at the top of the boiler. It is then extracted from this point and used for energy transfer.
Steam Usage: The generated steam is directed towards systems that require energy transfer. These systems often include steam turbines or heating systems.
Ash Formation and Disposal: After combustion, solid fuels leave behind ash and unburned residues. These residues usually accumulate at the bottom of the boiler and are periodically removed.
Exhaust of Flue Gases: At the end of the process, the flue gases resulting from combustion are expelled to the outside through chimneys or exhaust systems. These gases generally contain waste products generated during combustion.