What is a waste heat boiler?
Waste heat boiler uses heat created as a by -product of another process, heat that would be normally unnecessary, and uses it to create steam. Steam can be used to control turbines that produce electricity. Alternatively, the boiler can be easily used to heat water or other types of fluid. Since it recycles part of the energy used, the waste heat boiler or boilers for recovery of waste heat may reduce fossil fuel consumption and the financial cost of running the system. This also means that less greenhouse gases are released into the atmosphere.
The design of the waste heat boiler includes two main types: boilers of the fire tube or boilers of shells and boilers with water tubes. In the boiler of the fire tube, it surrounds a steel shell space filled with water with metal tubes inside. Hot gases made from the combustion process, such as inside the furnace, pass there and back by tubes transmitting heat to the surrounding water. Thermal energy stored inE water can be used to respond to a short -term special demand, although if all heat is used, the disadvantage is that the addition will take a long time. Another limitation of this type of waste heat equipment is that it cannot work at higher pressures when water boilers can.
The waste thermal boiler of the water tube construction is able to cope with much higher steam pressure than the fire tube boilers, but it is more difficult to construct and install. Inside this type of waste heat boiler are narrower tubes than inside the boiler of the fire tube and the tubes instead of hot gases contain water. When reversing the system inside the boiler of the fire tube, waste heat, in the form of hot gases or flames of the furnace, it surrounds the tubes filled with water. The insulating materials are used to protect the boiler tubes from damage to the flame. As well as tolerating high pressures, a waste thermal boiler for water-tube can quickly reaGrvate on changes in heat input.
Waste heat boilers can be used in so -called combined heat and power or CHP. These are power plants where heat is usually used, which is usually created as an by -product of electricity production, which increases efficiency from approximately 40 percent to approximately 70 percent. Maximum efficiency is achieved when heat is used in place or near the plant site.