90kw Electric Steam Generator for Aromatherapy

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Principle and Function of Steam Generator Blowdown Heat Recovery System

Steam boiler blowdown water is in fact high temperature saturated water under boiler operating pressure, and there are many problems in how to treat it.
First of all, after the high-temperature sewage is discharged, a large amount of secondary steam will be flashed out due to the pressure drop. For the sake of safety and environmental protection, we must mix it with cooling water for cooling. The efficient and quiet mixing of steam and water has always been something that cannot be ignored. question.
In consideration of safety and environmental protection requirements, the high-temperature sewage after flash evaporation must be effectively cooled. If the sewage is directly mixed with the cooling liquid, the cooling liquid will inevitably be polluted by the sewage, so it can only be discharged, which will It is a big waste.

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What’s more noteworthy is that high temperature sewage carries considerable heat energy, so we can completely cool it and discharge it, and recover the heat contained in it.

Nobeth steam generator waste heat recovery system is a well-designed waste heat recovery system, which recovers 80% of the heat in the water discharged from the boiler, increases the temperature of the boiler feed water, and saves fuel; at the same time, the sewage is discharged safely at low temperature.
The main working principle of the waste heat recovery system is that the boiler sewage discharged from the boiler TDS automatic control system first enters the flash tank, and releases flash steam due to the pressure drop. The design of the tank ensures that the flash steam is completely separated from the sewage at low flow rates. The separated flash steam is extracted and sprayed into the boiler feed tank through the steam distributor.
A float trap is installed at the bottom outlet of the flash tank to discharge the remaining sewage. Since the sewage is still very hot, we pass it through a heat exchanger to heat the boiler cold make-up water, and then discharge it safely at low temperature.
In order to save energy, the start and stop of the internal circulation pump are controlled by the temperature sensor switch installed at the inlet of the sewage to the heat exchanger. The circulation pump only runs when the blowdown water is flowing. It is not difficult to see that with this system, the heat energy of the sewage is basically completely recovered, and correspondingly, we save the fuel consumed by the boiler.