SCHELL GmbH & Co.KG.
Schell was founded in Tyrol around 30 years ago as a family business. It manufacturers with our subsidiary ItalSchell ECOPRIMA® vacuum evaporators to treat industrial waste water in a customised and client-specific way. With Schell Eurasia we were able to get a foothold in Russia 10 years ago.
Company details
Find locations served, office locations
- Business Type:
- Manufacturer
- Industry Type:
- Water Treatment
- Market Focus:
- Globally (various continents)
About Us
Traditional efficient processing systems for the treatment and disposal of waste water are cost-intensive and not sufficiently eftective.
The Schell vacuum evaporator tor waste water processing shows that it is possible to produce goods (e.g. in the galvanisation process) and to reduce the volume of waste water while at the same time cutting the burden on the environment.
The use of a vacuum evaporator is an advantage for the environment, and in practice results in a reduction of current or expected residue disposal costs..
Vacuum evaporation technology is a process that has been used for decades by the chemical industry.
However, traditional distillatlon systems require extremely complex installations and very high energy costs, which is why the evaporation process is uneconomical in most cases. On the other hand, vapour compressors are obliged to operate at high temperatures, leading automatically to corrosion and encrustations on the heat exchangers in the absence of pretreatment, which again involves costs.
The structure of the ECOPRIMA vacuum evaporators is based on the tried and tested technology of the heat pump combined with a vacuum, using an innovatory arrangement on the bolling and condensation side to ensure an even more gentle distillation process, a higher yield from the water, a higher degree of concentration and a significantly lower consumption of energy as compared with other products.
As is well known, water boils at approx. 100°C...
As is well known, water boils at approx. 100°C; the lower the ambient pressure, the earlier water will boil and evaporate, since the air resistance is lower. Under a vacuum (residual pressure) of approx. 40 mbar, the boiling point of water is only approx. 30°C.
Boiling temperature plays a major role in chemistry, the lower it is, the lower is the risk of decomposition in the case of many products. At the same time, encrustation is considerably cut back.
A sturdy water jet pump (7) combined with a Venturi injector (5) are responsible for creating the vacuum.
The required heat and cold are provided by an integrated heat pump (1) (compressor and refrigerant).
The compressor (1) compresses a gas mixture (refrigerant), heating it to a temperature of approx. 70°C.
The compressed gas is pumped into the coil and the heating jacket of the boiling chamber (2).
This coil acts as heat exchanger. Since it is submersed in the liquid to be concentrated, it transmits practically the whole of the heat 01 the compressed gas to the liquid.
The liquid (contaminated water) in the boiling chamber (2) begins to boil when the specified temperature and the vacuum are reached. This is the first distillation effect - water from a liquid to a vapour condition.
After almost all the heat has been conveyed into the boiling chamber, the refrigerant must be cooled further; this task is carried out by the air-cooled or water-cooled heat exchange r(8).
After emitting its residual heat, the refrigerant is transported to the coil of the condensation chamber
(3) and vaporised by means of an expansion valve inside the cooling coil.
The expansion (evaporation) of the refrigerant 'generates' cold by means of the reverse compression effect.
The water vapour that has formed In the boiling chamber now moves to the cold area of the condensation chamber (3), and condenses, becoming liquid when it touches the cold surface of the coil.
The liquid is sucked up by the Venturi jet (5) (vacuum cycle) from the floor of the condensation chamber (3) and conveyed to the distillate tank(4).
The vacuum cycle takes place in the distillate tank (4), and has the dual function of generating a vacuum of approx. 30-40 mbar residual pressure inside the boiling chamber and a pressure of approx. 0.2 bar inside the distillate tank (4), in order to permit the recovered distillate to be output without the use of an additional pump.
This distillate is either returned to the process or fed to the sewers after final inspection.
The degree of concentration of the residues in the boiling chamber is determined by time or density measurement. After the process is complete, the concentrate can be removed from the machine automatically by a concentrate pump (6) or manually by means of a drain tap or a flap in the floor.
This concentrate is either returned to the process or disposed of externally.
The refrigerant compressor (1) and its cycle is enclosed and self lubricating. Its working life corresponds with that of a normal air conditioning system or refrigerator, or even longer, given that it is rarely switched on and off.
Applications
Metal Processing
- Concentrating and cracking emulsions or degreasing solutions, e.g. after ultra-filtration
- Concentrating of pickling solutions
- Concentrating of phosphatising solutions
- Concentrating of vibratory grinding waste water
- Concentrating of die-casting residues (separating agents, lubricants, clycols)
- Concentrating and recovery of hardening staffs from standing washers
Galvanisation Process
- Concentrating and recovery of electrolytes from swills (nickel, silver, copper...)
- Concentrating and recovery of aggressive acids (chromic acid, sulphuric acid, ...)
- Concentrating and recovery of precious metals from swills
- Concentrating of eluates from the regeneration of ion exchangers
- Concentrating and recovery of diluted active solutions
Fhotographic, Printing, And Textile Industry
- Concentrating of fixing, developing and bleaching solutions
- Concentrating of pressure-roller and frame-washing water
- Concentrating and recovery of dying and printing pigments from washing water
- Concentrating and recovery of organic impurities from contaminated waste waters
- Concentrating of adhesive or limes from washing water
Panting Processing Industry
- Concentrating and recovery of paints from spray booths
- Concentrating of phosphatising and degreasing solutions
Pharmaceutical Industry
Concentrating and recovery of organic impurities from contaminated waste waters
Leather Processing
- Concentrating and recovery of organic impurities from contaminated waste waters
- Concentrating and recovery of aggressive acids
Food Industry
- Concentrating of dairy waste water
- Concentrating and recovery of sugar solutions
- Concentrating of must to avoid adding sugar, in wine processing
- Production of drinking water from sea water
Waste Landfills
Concentrating of gravitational water e.g. after an osmosis reversal
Why is this product so innovative?
ECOPRIMA® are vacuum distillation systems that recover clean water to be re-use from contaminated waste water, without any chemicals. ECOPRIMA® are therefore very innovative and state of the art concerning fluid treatment and fluid disposal.
Innovation in the company
Schell works closely with various European universities and currently we are taking part in the EU programme Horizon 2020 with our engineers.
With renowned references in 34 countries, Schell is the most experienced independent manufacturer in this market. We are very proud that our ECOPRIMA® systems have been successfully used for many years in central banks, mints, government printing houses, as well as companies such as Swarovski.
Schell is ISO 9001 certified and all systems are designed, planned and built in accordance with the directive PED 97/23/EC, compulsory for all pressure equipment.
Research, planning and construction depend on the type of waste water to be treated, from low-concern oil- emulsions to dangerous aggressive acids, and even to radioactively contaminated fluid.
Accurate selection of the components, careful planning and professional production department, enable us to design high-quality systems, and make customers satisfied of their investments: it is our main goal!
Our technical assistance department, with the best specialists in this field, guarantees competent and excellent service, even for systems of other brands.