EVAPORATORS

EVAPORATORS   PROCESS DIAGRAM

C&G technology is taking advantage from the principle of BOILING in VACUUM-CONDITION - The equipment only requires an electrical-supply which, via refrigerating-cycle and relevant heat-pump with consequent VERY LOW cost of energy.

Looking at the enclosed schematic:

• At no 1 is the compressor for freon gas (type 143 environmental safe)
• At no 2 is the boiling chamber
• At no 3 is the heat-exchanger, by air or water
• At no 4 is condensation room
• At no 5 is the pump of the ejector (a Venturi tube)
• At no 6 is the tank to collect the distilled liquid
• At no 7 is the pump to discharge the concentrated sludge

HOW THE HEAT IN THE EVAPORATOR IS GENERATED

The compressor (1) is compacting the freon gas. By the effect of compression the gas is heating-up to reach the temperature of approx 60-70°C. The compressed gas is then conveyed into the serpentine/coil arranged inside the boiling chamber (2) if a vertical unit type V or to the side-walls if a flat unit type ES for ultimate concentration to almost dry condition. The above serpentine has the function of heat-exchanger. It stays in fact immerged into the liquid to be concentrated and is releasing to it almost all of the heat generated by the compressed freon gas. As soon as the pre-set temperature is reached inside the boiling chamber (2) the liquid starts boiling and we have obtained the first effect of distillation i.e. the liquid to be concentrated has converted from liquid into steam.

Let’s now see the route of the freon-gas:

After almost all of the heat has been released into the boiling chamber (2) the gas requires to further lose heat and this is obtained by passing the freon-gas through the heat-echanger (3) which has a through-flow of either air or water. At this stage the freon has released its heat to the liquid to be concentrated and is then conveyed into the serpentine arranged in the condensation-chamber (4) through one expansion valve and thereafter atomised inside the serpentine. When expanding the freon gas, due to effect OPPOSITE to compression, will produce frigories. The steam generated in the boiling chamber (2) will move towards the cool area of the condensation chamber (4) and, as soon as in contact with the cool surface of the serpentine, it will condensate and come back to the liquid form. From the bottom of the condensation chamber it shall then be sucked by the Venturi-tube (ejector) at (5) and conveyed to the reservoir of the distillated liquid (6).

The circuit of pump and ejector has a DOUBLE-ACTION i.e.

• To create VACUUM inside the concentrator, up to 700-740 MM-HG and, AT THE SAME TIME
• To create a pressure of approx 0.3 BAR inside the reservoir (6) which makes it possible for the distillated liquid to be extracted WITHOUT NEED OF ANOTHER PUMP.

One extraction-pump (7) allows to take the concentrated liquid off and NON-STOP, without breaking the VACUUM and thus without need to make vacuum again after the discharge. This is referred to Serial V while in Serial ES, for ultimate concentration aiming to reach the "almost-dry" condition, the concentrated mud can not be pumped and has to be removed by hand after opening the front port-hole.

The equipment can be run either NON-STOP or at time intervals. The working cycle is fully automatic thanks to a set of safety devices which shall be activated and monitored by light-signal in case of malfunctioning.

The unit requires a good maintenance programme for the proper performance of the extraction-pump (in the serial V - vertical) or the removal of the solid waste in the serial ES (horizontal), the visual checking of the pressure-gauges (manometers) and vcuum-metering unit, the occasional cleaning of the filters.

The compressor for the freon-gas is sealed and auto-lubricating and its duration is equal or longer to the life of an house-refrigerator or air-conditioner.

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