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Waste heat boilers are the important heat recovery equipment, applied to maximize the waste heat released from the process of combustion and other industrial processes.
Waste heat boiler is efficient in recovering the waste heat emitted from industrial processes, thus saving energy and costs. The boiler operates by burning fuels such as coal or gas, producing an energy-rich stream of hot exhaust gases and Superheated steam. Waste heat boilers are most commonly used for high-pressure steam generation for the generation of electricity.
The construction of a waste heat boiler is comparatively complex because it involves several different components and systems. These include the pressure vessel, the feed water system, the heat source, and the superheater.
Typically, the heat source of a waste heat boiler is the hot exhaust gases that are released from the combustion of particular fuels. These fuels usually include natural gas, oil, propane, coal, and coal to liquid fuel. These gases often contain high levels of nitrogen dioxide and carbon dioxide, which can be corrosive to the boiler. To prevent corrosion, the inside of the boiler, as well as the fuel being burned, needs to be closely monitored to ensure that the correct quantity of pollutants is present.
Once the heat source is identified, the fuel is mixed with the watery passage created in the boiler. This is known as the feed water system and is responsible for creating the water vapor that will be used in the process of heat recovery. The feedwater is heated to generate steam, then sent through the system of tubes at various environmental conditions and temperatures.
The superheater is the part of the boiler responsible for the generation of superheated steam. This is achieved by passing the steam through a circulated path of superheated water. The water is heated to temperatures up to 600 degrees Celsius, before being released from the boiler as superheated steam.
Finally, the water vapor is converted into steam, which is then used in various processes such as paper making, food processing and power generation. The steam can also be used for cleaning, sterilizing, and drying out certain products, as well as heating and cooling systems.
Overall, the waste heat boilers are complex machines but are essential in providing a feasible and efficient way to recover heat that otherwise would be wasted. These boilers can reduce emissions, decrease energy usage and boost economies of scale.
