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MVR Evaporator

MVR Evaporator

System composition:

  It includes heater,separator, compressor, vacuum pump, circulation pump, operation platform, electric control cabinet, liquid level automatic control system & internal valve&pipe fittings, the structure is quite simple.

 

Working principle:

  Its principle is to use high energy efficient steam compressor to compress evaporation of secondary steam, converts electrical energy into heat energy , and improve the secondary steam enthalpy, the improving heat secondary heating steam be feeding into the evaporation chamber for heating, in order to achieve cyclic utilization the existing  secondary steam heat, so no need feed external live steam, rely on the evaporator since the cycle to achieve the purpose of evaporation concentration.       .Theoretically using MVR evaporators save more than 80% of energy than conventional evaporator, save more than 90% water, reduce more than 50% of floor space.

Main principle: Mechanical vapor recompression MVR evaporator using secondary steam generated in the evaporator, after compressing, the pressure/temperature/ enthalpy increased, and then feed to the heating chamber as heating source, which make the liquid keep boiling, while the heating steam will be cooled into condensate water. In this way, have made full use of the secondary vapor and recover latent heat& improve heat efficiency, live steam economy is equivalent to 30 effect of multi-effect evaporation, reduced the demand of external heating and cooling resources, reduce the energy consumption and reduce pollution.

Main type:

MVR forced circulation evaporator, MVR rising film evaporator, MVR falling film evaporator, MVR split type evaporator.

 

Main features:
   1.The MVR evaporator energy saving technology is the most advanced international technology of evaporator, only need few live steam (When start evaporator need few live steam, during normal running almost no need live steam), which greatly reduce business operating costs, reduce environmental pollution.
    2. Due to adopt compressor supply heat source, there is little temperature difference which compared with traditional evaporator, and can achieve moderate evaporation, greatly improved product quality and reduce fouling.
    3.No need condenser or only need small size condenser, the structure and process are quite simple, it can be full automatic operation, continuous running, safety and reliable.
    4.This evaporator internal system equipped with CIP clean pipeline, which can achieve clean in place, easy to operate and without dead angle.
    5. Liquid material can be evaporated under low temperature (50-100℃) in this evaporator, the liquid material is uniform and without running material, not easy coking, material heating denaturation is minimal.
    6. Due to use of 100% recycling secondary steam latent heat, completely avoid the use of live steam, so greatly reduced steam consumption.
    7. For heat-sensitive materials can be used with vacuum pump, which can be done in close to absolute pressure under vacuum, so as to realize low temperature evaporation, the minimum evaporation temperature can be 50 ℃;
    8. Simple process control and automation——Because of the small amount of fluid retention, the falling film evaporator can be change according to different vacuum degree/feeding capacity/ concentration/ temperature , which is the basic conditions for stable quality of products.
    9. The handling capacity can be up to 100T/h, with advantages such as small floor space, compact structure, stable operation and so on.

 

MVR evaporator consist:
Pre-heater: At most of time, the liquid material should be through pre-heater first for pre-heating before getting into evaporator.

Evaporator: The liquid material inside the evaporator heated by steam for evaporation. Choose different type evaporator according to different liquid material features.

Separator(crystallizer): use to separate vapor and liquid, according to different liquid features choose different type separator(crystallizer), such as normal separator, gravity separator, special design separator (crystallizer ).

Vacuum system: Use to keep the whole system vacuum degree, pump some air, fixed gas, liquid entrainment of gas from the evaporator, so as to obtain the whole system stable evaporation process.

Pump: Use to transfer  liquid and concentrated liquid. According to different liquid features choose  different pumps, such as centrifugal pump, displacement pump,screw pump.
 
Compressor: Use to compress secondary vapor to supply heating source, improve secondary vapor enthalpy. According to different flow and compression ratio choose different compressor, in the case of pressure rise increase, multistage compressor can be used in series.

Control system: MVR Evaporation system control center, by regular motor speed, control valve,flow meter, temperature and pressure, to realize automatic evaporation, cleaning, stop operations and so on. Automatic alarm, automatic protection system is not damaged, keep dynamic balance.  

Cleaning system: Different liquid after period of evaporator, there maybe scaling phenomenon, general speaking, 99% of the scale can be removed by adding chemical solvent, and can use CIP clean in situ or disassemble to clean.  

Scope of application:

Mechanical vapor compression(MVR) evaporator, suitable for milk, glucose, organic acid, VC, xylose, pharmaceutical, chemical and biological engineering, environmental engineering, waste recycling, paper making, salt industry for low temperature concentration.

MVR and triple effect evaporation equipment running cost compare:



10T/h Evaporator running cost compare

Name

MVR evaporator

Triple-effect evaporator

Steam consumption cost

0.6(material pre-heating steam    consumption)t/h×180RMB/t=108RMB/h

【4.0+0.6(material pre-heating steam consumption)】t/h×180RMB/t=828RMB/h

 Electric    charge

500kw/h×0.80RMB/kw=400RMB/h

160kw/h×0.80RMB/kw=128RMB/h

Recovery of condensed water

10.6t/h×3RMB/t=32RMB/h

14.6t/h×3RMB/t=44RMB/h

 Operation cost per hour

108+400-32=476RMB/h

828+128-44=912RMB/h

Annual operating cost

476RMB/h×24h×300day=3427200RMB

912RMB/h×24h×300day=6566400RMB

Annual operating cost difference6566400-3427200=3139200RMB

 

Product   type

CSIC centrifugal compressor

Centrifugal   blower

Product   picture

2.png

Compression   ratio

Ratio>1.5

Ratio<1.5

Max   flow rate

200T/h

120T/h

Compression   temperature rise

Sing-class   8-20

Sing-class   6-8

Impeller   form

Three-dimensional   flow, Centrifugal type

two-dimensional   flow, Centrifugal type

Impeller   fabrication process

Forgings   whole milling

Welding

Impeller   material

Forging    steam turbine steel titanium alloy

Cast   ironnickel plating/nickel   phosphorus

Fabrication   cost

Expensive

Cheap

Impeller   picture

3.png

4.png

Impeller   weight

Light,   Starting current is small

Heavy,   Starting current is big

Shaft

Tilting-pad

Ball   bearing

Power   balance accuracy

High   (Without counterbalance)

Low(Welding   counterbalance)

Machining   stress

Low

High

Motor

Asynchronous   motor/High voltage motor (Domestic)

Only   imported  straight motor (Expensive,   cumbersome after sale service)

Quality   guarantee

2years

1year

Compression   efficiency

>80%

>81%, If tow sets in series, Ƞ=0.81*0.81=0.66

Sound   insulation/cover

Yes,   ≤85dB

No

After   sale service

Within   24hours

Long

Custom-made   cycle

Easy   to Custom-made, within 3 months

Difficult   to custom-made, need 8-10months

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