Evaporators

Process optimization is Dedert's specialty. Each Dedert Evaporator system is configured to provide the customer with the quickest return on their investment. Advantages with Dedert's Evaporating Technology include:

For over 50 years, Dedert has developed solutions to save energy, reduce waste, reclaim by-products and increase efficiency, always with the consideration of reducing operating costs. Every inquiry receives the same arduous study to find the optimum solution in terms of:

Dedert considers various types of heat transfer surfaces and all energy sources available by the customer to power the evaporator.

Types of Heat Transfer

Dedert offers the following types of heat transfer surface:

Energy Sources

STEAM HEATED

Steam Heated Evaporators are preferred when low pressure steam is available and inexpensive. The steam is condensed on the shell side of the evaporator, which operates at a higher pressure than on the tube side and drives evaporation. The evaporation from the first effect is used as the heating source for the subsequent effect. The vapors produced in the last effect are condensed in a condenser. Steam cost, overall available temperature differential, space requirements and product characteristics are considered to optimize the number of effects.

MECHANICAL VAPOR RECOMPRESSION

Dedert originally introduced Mechanical Vapor Recompression (MVR) to the corn wet milling industry over 40 years ago. The evaporator components are similar to steam driven systems, but with the addition of a mechanical compressor or fan. Mechanical energy compresses evaporated process vapor to a higher pressure and condensing temperature, and returns it to the process, minimizing steam consumption.

With increased gas prices, MVR has become the popular option for reducing operating costs, especially at higher evaporation rates. Fewer vessels are required than in steam powered multiple effect systems, resulting in lower installation costs.

THERMAL VAPOR RECOMPRESSION

Thermal Vapor Recompression (TVR) system is more energy efficient than a steam heated system when medium to high pressure steam is available. The motive steam enters through the nozzles and draws in recycled suction vapor. The vapor mixes in the converging section, and the recycled vapor is boosted to an intermediate pressure. Recycling the suction vapor allows for a lower steam consumption. Thermocompressors are more efficient when they are recycling more vapour, producing a lower boost and therefore requiring less steam.

WASTE ENERGY

As part of the movement for sustainable future, increased efforts have been made in finding ways to reuse energy from other parts of the plants. Dedert has long been a pioneer in waste heat recovery and was granted the US patent for an evaporator chest with built-in scrubber for the corn wet milling industry.

Integrating evaporators to take advantage of the free energy from dryers or distillation columns reduces the plant overall energy consumption and impact on the environment. There is also a reduction in energy requirements for the downstream emissions handling equipment.

An evaporator can use many different energy sources in lieu of steam and Dedert has considerable expertise in making use of otherwise wasted energy sources:

Integration can also reduce capital expenditures:

Dedert can provide everything from the basic skid to a full Turnkey solution. Pre-assembled skid mounted projects feature:

• Tubular and/or plate type heat exchangers Structural Steel
• Structural Steel
• Pumps and motors
• Instrumentation and control valves
• Piping
• Electrical Junction Box or MCC / PLC
• Assembly, Insulation and Wiring
• 3-D Modelling for equipment, piping and steel
• Optional code stamp for pressure vessels