AQUADEST-KR
Crystallization vacuum evaporator with a heat pump
- Concentrate in semi-solid state
- No liquid waste
- Reusable concentrate
- Suitable for highly concentrated inlet solutions
- Suitable for thermally instable and highly corrosive solutions
- Best performace at low volumes of inlet solution
- Batch operation
Crystallization vacuum evaporators AQUADEST-KR uses circulation heat pump as a cooling and heating element. Vacuum is provided by ejector jet.
Crystallization vacuum evaporators AQUADEST-KR can be used as a second step of concentration. First step of concentration can be made by using evaporators AQUADEST-D or AQUADEST-K. Concentrate out of these two evaporators can be fed into AQUADEST-KR and further concentrated up to semi-solid state. This sollution achieves highest reduction of concentrate volume.
Semi-solid concentrate can be transformed to solid state crystals using Big-bags. Crystals can be then either reused in the production process or has to be disposed. The leachate from Big-bag is fed back to inlet of crystallization vacuum evaporator. Therefore there is no liquid waste that would need to be otherwise disposed.
The pressure in the boiling chamber is 6-7 kPa. The boiling point of water is at 35-40 °C. Energy consumption per one liter of distillate starts at 0,2 kWh.
Solution for:
- Concentrated waste waters
- Concentrates from membrane separation processes (retentates - Reverse osmosis)
- Rinse water after quenching in salt baths
- Waste water containing solid insoluble solution
- Further concentration of concentrate out of AQUADEST-D and AQUADEST-K
Material options for AQUADEST-VR:
- Stainless steel 316 L/Ti
- Super-duplex SAF 2507
- Nickel alloy 2.4819
Material is always designed with respect to inlet solution.
Technology process
Inlet solution is fed into the boiling chamber, where it heats up through heating jacket of the heat pump. The solution doesn't circulate in the boiling chamber.
Due to heating and low pressure in the boiling chamber the solution boils. Evaporated part of solution rises to the top part of boiling chamber, where it condeses on cooling heat exchanger of the heat pump.The condesed part is called distillate. Distilate is sucked out of heat exchanger with the ejector jet into retention tank, later out of the evaporator.
Unevaporated part of the solution stays in the boiling and forms crystals on the surface of boiling chamber. To ensure maximal effectivity of heat transfer, evaporater is equiped with the scraper which continously wipes the surface clean.
Heating and cooling is provided by the heat pump circuit. This circuit is made out of two heat exchangers, a compressor and a fan. Freon-free coolant is used as a medium in the heat pump circuit.
Our crystallization evaporators are characterized by batch operation. This means that the inlet solution is fed into the boiling chamber. Once it reaches desired maximum concentration, the whole volume of boiling chamber is released. When the batch is released automatical cleaning system cleans the inside of the boiling chamber with the distillate. During the evaporation fresh inlet solution is continously fed into the boiling chamber to increase the volume of concentrate for a single batch.
Product portfolio
| Distillate production [l/day] | Operational performance [kW] | |
|---|---|---|
| AQUADEST - KR 250 | 250 | 3 |
| AQUADEST - KR 500 | 500 | 5 |
| AQUADEST - KR 1 000 | 1 000 | 9 |
| AQUADEST - KR 2 000 | 2 000 | 17 |
| AQUADEST - KR 3 000 | 3 000 | 25 |
AQUADEST-VR
Crystallization vacuum evaporator with external heat source
- Concentrate in semi-solid state
- No liquid waste
- Reusable concentrate
- Usage of excess heat from external process
- Suitable for highly concentrated inlet solutions
- Simple design ensures minimal malfuncions
- Best performace at high volumes of highly concentrated inlet solution
- Batch operation
Crystallization vacuum evaporators AQUADEST-VR use external source of heat in the form of hot water or hot steam. Vacuum evaporator can use excess heat from another production process. That is the reason why operational costs are very low. Vacuum is provided by ejector jet.
Crystallization vacuum evaporators AQUADEST-VR can be used as a second step of concentration. First step of concentration can be made by using evaporators AQUADEST-D or AQUADEST-K. Concentrate out of these two evaporators can be fed into AQUADEST-VR and further concentrated up to semi-solid state. This sollution achieves highest reduction of concentrate volume.
Semi-solid concentrate can be transformed to solid state crystals using Big-bags. Crystals can be then either reused in the production process or has to be disposed. The leachate from Big-bag is fed back to inlet of crystallization vacuum evaporator. Therefore there is no liquid waste that would need to be otherwise disposed.
Simple design and automatic washing system ensures easy maintenance of the evaporator.
The pressure in the boiling chamber is 6-30 kPa. The boiling point of water is at 35-70 °C. Energy consumption per one liter of distillate starts for heating and cooling 0,72 kWh. AQUADEST-VR doesn't have own production heating elements.
Solution for:
- Concentrated waste waters
- Concentrates from membrane separation processes (retentates - Reverse osmosis)
- Rinse water after quenching in salt baths
- Waste water containing solid insoluble solution
- Further concentration of concentrate out of AQUADEST-D and AQUADEST-K
Material options for AQUADEST-VR:
- Stainless steel 316 L/Ti
- Super-duplex SAF 2507
- Nickel alloy 2.4819
Material is always designed with respect to inlet solution.
Technology process
Inlet solution is fed into the boiling chamber, where it heats up through heating jacket. Heating jacket uses external hot water or vapour as a heating medium. The solution doesn't circulate in the boiling chamber.
Evaporated part of the solution rises to the top level of the boiling chamber, where it condenses on the heat exchanger. This heat exchanger uses cold water from external source as a cooling medium. Condensed vapour is called distillate. Disitillate is sucked out of the heat exchanger with a ejector jet into the retention tank. Ejector jet is the only source of vacuum in this evaporator.
Product portfolio
| Distillate production [l/day] | Operational performance [kW] | |
|---|---|---|
| AQUADEST - VR 2 000 | 2 000 | 60 |
| AQUADEST - VR 4 000 | 4 000 | 120 |
| AQUADEST - VR 6 000 | 6 000 | 180 |
| AQUADEST - VR 8 000 | 8 000 | 240 |
AQUADEST-V
Vacuum evaporator with external source of heating/cooling
- Suitable for thermally unstable and corrosive substances
- Low acquisition and operation costs
- For large volumes of inlet solutions
- Continuous operation
AQUADEST V evaporator uses external source of hot water for heating and external source of cooling water for cooling. A water ejector nozzle serves as a vacuum source.
AQUADEST V evaporator is designed for processing of thermally unstable and corrosive substances. Evaporation takes place at a very low temperature and therefore the whole process is very gentle to the treated solution.
The evaporator is designed as a multi-stage evaporator, with a different concentration in each stage. The first stage is heated and the last stage is cooled.
The vacuum evaporator normally operates at a pressure of 6-30 kPa and the solution boils at 35-70 °C. The energy consumption per litre of distillate is 0.72 kWh/(number of stages) for heating and cooling. The energy consumption decreases with the number of stages. Waste or residual heat produced by other equipment may be used for heating.
The wetted parts of the AQUADEST-V evaporator are available in the following material versions, always taking into account the characteristics and nature of the inlet solution:
- Stainless steel 316 L/Ti
- Superduplex SAF 2507
- Nickel alloy 2.4819
Distillate output range is from 90,000 to 400,000 l/day
Technology process
The inlet solution is supplied directly into the boiling chamber. The solution is driven from there by a circulation pump through heat exchanger, where the solution is heated and goes back to the boiling chamber. When entering the boiling chamber, rapid evaporation occurs. Part of the solution evaporates immediately due to the high temperature and rapid drop in pressure. The non-evaporated part of the solution remains in the boiling chamber and circulates again in the concentrate circuit.
In the first stage – evaporated part of solution enters the heat exchanger, where it transfers heat to the next stage during condensation. In the last stage – evaporated part of solution rises to the upper part of the boiling chamber, where it condenses on the cooling heat exchanger. The condensed vapour is exhausted from the heat exchangers by means of the ejector nozzle, which creates a vacuum in the boiling chambers. The distillate is then discharged from the vacuum evaporator.
Heating is provided by hot water, which is supplied into the heat exchanger in the first stage, where it transfers needed thermal energy and it is subsequently returned to the external system of hot water for re-heating.
Cooling of distillate in the cooling exchanger is provided by cooling water, which is supplied from the external cooling source (cooling tower, etc.). In the last stage - the condensed vapour of distillate is cooled in the cooling exchanger and it is subsequently returned to the external cooling system for re-cooling.
