Significant energy saving by utilizing MVR industrial heat pump in thermal separation

processes

By: Kjetil Evenmo, Senior Engineer

POLEKO 2012

AGENDA

Energy systems in thermal separation processes

MVR – the most efficient energy system for a number of applications

MVR evaporator plants within Biogas reject / waste water applications

Other MVR thermal separation processes

100%

100%

One stage evaporator

100% Energy in = 100% evaporated = 100% cooling effect

Evaporator

Condenser

100%

33%

33%

33%

33%

3-stage cascade evaporator

33% Energy in = 100% evaporated = 33% cooling effect

33%

67%

33%

33%

TVR evaporator (Thermal Vapor Recompression)

33% Energy in = 100% evaporated = 33% cooling effect

33%

100%

1 - 5% (electrical)

Practically no cooling water!

MVR evaporator (Mechanical Vapor Recompression)

1 - 5% Energy in = 100% evaporated

0

100

200

300

400

500

600

700

800

En

erg

y ,

kW

h/t

One stage direct steam

Typical TVR or cascade

MVR

(MVR = Mechanical Vapor

Recompression).

100oC

105oC

MVR – the most efficient energy system:

90-99% reduced energy consumption practically no cooling water reliable energy system well proven technology good profitability

EPCON falling film MVR evaporator (FFE-MVR)

Applications for EPCON MVR evaporators

Food industry Biomarine industry Chemical industry Mineral & metallurgic industry Waste water treatment Biogas reject water treatment

Example: Biogas reject water system with EPCON MVR evaporator:

Feed pre-treatment & pre-heating

Condensate polishing if required

Condensate

Concentrate

Biogas reject water plant

FFE-MVR incl. pre-treatment

Capacity feed: 4 to 100 tons/hour

Energy cons. 15-20 kWh/ton evap.

Pre-fabr. skids for outdoor installation

Biogas reject water plant

EPCOVAP-MVR incl. pre-treatment

Capacity feed: 0.5 to 4 tons/hour

Energy cons. 30-50 kWh/ton evap.

Pre-fabr. skids for outdoor installation

Other EPCON MVR thermal separation processes

0

200

400

600

800

1000

1200

Typical Conventional Air Dryer System

Super Heated Steam dryer

Super Heated Steam MVR dryer

MVR superheated steam dryer

Several applications

~80% energy saving

No explosion risk

No polluted air discharge

Patent application, 2011

MVR bio-ethanol dehydration

Retentate: fuel quality (99.7%)

Feed: 85-95% ethanol

Water fraction: ~pure water

~80% energy saving

Patented process

Other MVR heat pump applications MVR for distillation processes (example: bio-ethanol)

Rebuilding of existing high energy demanding evaporators to MVR energy system

Energy saving: 80 – 95%

After rebuild with MVR

Original 5-stage cascade evaporator converted to MVR

Existing cascade evaporator

THANKS FOR YOUR ATTENTION!