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MVR evaporator


 

1. Overview of MVR evaporator
MVR evaporator is the abbreviation of mechanical vapor recompression technology (mechanical vapor recompression). It is an energy-saving technology that reuses the secondary vapor energy generated by evaporation to reduce the external energy demand.
Use occasion
1. Concentration and crystallization of wastewater from biopharmaceutical and chemical industries
2. Concentrated crystallization of inorganic salt products
3. Evaporation, concentration and crystallization of some drugs
Alternative equipment
1. Multi-effect falling film evaporator
2. Replace the forced external circulation to cooperate with the RJD unit

2. Features of MVR evaporator
1. There is no need for steam evaporation, and normal evaporation can be maintained only by recovering the waste heat of the secondary steam and mechanical compression.
2. No need for condensing system, no cooling water to cool the secondary steam.
3. It can realize low-temperature evaporation, which is suitable for the concentration of heat-sensitive materials.
4. Low energy consumption, only 30KW of electricity consumption is needed to evaporate per ton of water, and the total efficiency is equivalent to 20-effect evaporator.

3. The economic benefit analysis of MVR
Take MVR-MJ200 unit as an example, the material solution is ammonium sulfate wastewater. The evaporation capacity of MVR-MJ200 forced external circulation unit is 5000Kg/h; generally speaking, the evaporation capacity of 5000Kg/h ammonium sulfate wastewater mostly uses double-effect evaporator. The steam energy efficiency ratio is about 0.55, and the cooling water consumption is 10 cubic meters per ton of evaporation. (Calculated based on steam price: 200 yuan/ton, electricity price: 0.65 yuan/kWh, cooling water price: 0.15 yuan/m3)
The operating cost of a 5t/h double-effect evaporator unit is:
1. Steam cost 5 t/h×0.55×200 yuan/t×7200h/year = 3.96 million yuan/year;
2. Circulating water cost 5 t/h×10m3/t×0.15 yuan/m3×7200h/year = 54,000 yuan/year;
3. Total cost of double-effect ammonium sulfate unit: 396+5.4=4.014 million yuan/year
The total annual operating cost of the MVR-MJ50 unit:
1. Compressor power consumption: 149kW.h×0.65 yuan/kWh×7200 hours/year = 697,300 yuan
2. Preheating steam consumption: 0.06 tons/hour×200 yuan/t×7200h/year=86,400 yuan/year;
3. Compressor cooling water: 5 m3/h×0.15 yuan/m3×7200h/year=0.54 million yuan/year;
4. Annual operating cost of MVR-WQ50 unit: 69.73+8.64+0.54=780,100 yuan/year
The annual operating costs that can be saved by using the MVR system are: 401.4-78.91=3.2249 million yuan

4. Equipment configuration
Category Name Material Quantity Remarks
MVR falling film evaporator Falling film evaporator Ti/316L/2205 1 Use high-efficiency heat exchange tubes
Splitter Ti/316L/2205 1 Screw shell separation
Steam compressor Ti/316L/2205 1 Centrifugal, Roots, Screw
Preheater Ti/316L/2205 1 Tubular
Condensate tank 304 1 With signal output level control
Circulation/output pump Ti/316L/2205 1 High-quality brand-name products
Condensate output pump 304 1 With negative atmospheric pressure transmitter
Electric instrument system   1 Full/semi-automatic control optional
Pipeline system   1 High-quality brand-name products
MVR forced external circulation evaporator External heater Ti/316L/2205 1 Use high-efficiency heat exchange tubes
Evaporator Ti/316L/2205 1 Manhole, sight glass, defoaming, cleaning
Cyclone separator Ti/316L/2205 1 Efficient separation
Steam compressor Ti/316L/2205 1 Centrifugal, Roots, Screw
Forced circulation pump Ti/316L/2205 1 High-quality brand-name products
Condensate tank 304 1 With signal output level control
Condensate output pump 304 1 High-quality brand-name products
Electric instrument system   1 Full/semi-automatic control optional
Pipeline system   1 High-quality brand-name products
Note: The material of the equipment is determined according to the specific characteristics of the material.

5. Equipment selection
1. Equipment model
Ⅰ—— Ⅰ is a fully automatic unit
Ⅱ is semi-automatic unit
50—— Total heating area of heater
Q W—— strong appearance MVR evaporator
If it is a falling film type, it is marked as MJ
MVR-the code name of the evaporator using mechanical vapor recompression technology
2. Equipment capacity
Model Evaporation Processing capacity
MVR-QW36 0.9T/h 4.5m³/h
MVR-QW48 1.2 T/h 6 m³/h
MVR-QW60 1.5 T/h 7.5m³/h
MVR-QW96 2.4 T/h 12 m³/h
MVR-QW150 3.75 T/h 18.5 m³/h
MVR-MJ200 5 T/h 25 m³/h
MVR-MJ500 12.5 T/h 60 m³/h
MVR-MJ750 18 T/h 90 m³/h
Note: The processing capacity is calculated based on the feed concentration of 10% and the output concentration of 30%.
3. Quality requirements for public works
Public works Quality requirements
Steam 0.4MPa
Cooling water 7~15℃、0.2 MPa
Compressed air 0.7 Mpa、pure、dry
Electricity 380V 、50HZ
Vacuum -0.090MPa
4. Traffic requirements for public works
Model Power consumption Steam Cooling water Compressed air
MVR-QW36 55.5KW 0.01T/h For cooling with a small amount of fans For automatic control instrument
MVR-QW48 67 KW 0.013 T/h For cooling with a small amount of fans For automatic control instrument
MVR-QW60 79 KW 0.16T/h For cooling with a small amount of fans For automatic control instrument
MVR-QW96 105 KW 0.25T/h For cooling with a small amount of fans For automatic control instrument
MVR-QW150 137 KW 0.4 T/h For cooling with a small amount of fans For automatic control instrument
MVR-MJ200 149KW 0.06 T/h For cooling with a small amount of fans For automatic control instrument
MVR-MJ500 412 KW 0.1 T/h For cooling with a small amount of fans For automatic control instrument
MVR-MJ750 626 KW 0.2 T/h For cooling with a small amount of fans For automatic control instrument
Note: The power consumption is calculated based on the evaporation temperature of 80℃ and the vacuum degree of -0.05Mpa
5. Equipment occupation
Model Land occupation Remarks
MVR-QW36 1500*1500*3500  
MVR-QW48 2000*2000*3500 One-story steel frame
MVR-QW60 2400*2400*4500 One-story steel frame
MVR-QW96 4000*2000*6500 One-story steel frame
MVR-QW150 6000*3000*9000 One-story steel frame
MVR-MJ200 4000*4000*9000 Two-story steel frame
MVR-MJ500 6000*4000*9000 Two-story steel frame
MVR-MJ750 8000*4000*12000 Two-story steel frame


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