SMOKE or GASES. This source of heat is used generally when a surplus of energy in the form of smoke or hot gases exists.
In those cases, it is profitable to invest in a recovery unit or economizer that helps to reuse the heat that those smokes contain. Its design will be adjusted to the final application to which the residual heat will be destined. To do this, the recovery unit has coils, chambers, etc. through which water, air or any other fluid that it is interesting to warm up for other subsidiary process in the plant, will be forced to circulate.
Applications: Fuel saving by an industrial burner as a result of the preheating of the air used by it, for example, or, as a central heating or air conditioning of a plant, etc.
Water heating, steam production, etc.
The recovery systems are usually provided with a by-pass or diverter, to interrupt or to turn aside the smoke flow of its passage by the economizer or heat recovery unit.
THERMAL OIL. There are two types, synthetic and mineral, being different marks and models in the market, to work to different temperature ranks. We wrote about in a old post about the thermal fluid transmitters of heat.
The main characteristic of the oil is that it does not change of state when working over 100ºC under absolute pressure, reason why the circuit pressure that it generates it is not as high as the generated by other fluids.
We advise about the use of the thermal oil in processes in which it is needed indirect heat and high working temperatures (from 150 to 300 ºC).
Please remember that at the end of the useful life of the thermal oil, the user must recycle it, but about that we will speak in the next blogs.