Description
MVR Evaporation plant delivers substantial operational cost savings in areas with an ample supply of low-cost electrical energy.
Once an MVR evaporation plant is running, little or no additional steam is required. In the MVR evaporation plant, a centrifugal fan is used to recompress the vapour to a higher pressure, resulting in a temperature rise. This means that the recompressed vapour can be used as the evaporation plant heating medium, while the condensate is ideal for preheating of the feed product.
For low boiling point increases, a single-stage compressor can be used to fulfill the requirements of the design.
For high boiling point increases, we will provide two designs: multiple-stage compressors, single stage compressors combined with multiple-effect.
⚡ Key Energy Insight: The MVR evaporation plant almost doesn't use steam — electric energy is required as the main energy source.
The power consumption of the main motor of MVR is due to the heat exchange area and the evaporating temperature of the evaporation plant. The Heat exchange area is bigger, and as a result, power consumption is lower, but the investment in equipment is increased.
Evaporating temperature is higher and as a result, power consumption is lower, but fouling in the calandria is therefore increased; Evaporating temperature is lower and as a result, power consumption is higher.
MVR can be powered by an electric motor, the rotary speed of an MVR can be controlled by a frequency converter, and the rotary speed of an MVR may control the evaporation rate and final concentration of the MVR evaporation plant.
Fields of Application
Particularly suited for the food and beverages industry, chemical industry, the salt works industry, and environmental protection technology.
MVR Evaporation Plant Compared with a Normal Multiple-effect Evaporation Plant
| Type |
Multiple-effect Evaporation Plant / TVR Evaporation Plant |
MVR Evaporation Plant |
| Energy Sources |
Steam |
Electric Power |
| Energy Consumption of Concentrating Water of 1 Ton, Per Hour |
0.16 — 0.6 T |
18 — 26 Kw |
📊 For Example
Evaporation rate: 50 T/h | Unit price of steam: 160 RMB/T | Unit price of electric power: 0.8 RMB/Kw | 8,000 hours per annum.
| Type |
4-Effect Evaporation Plant |
MVR Evaporation Plant |
| Energy Consumption |
Steam: 11 T/h |
Electric Power: 1,000 Kw/h |
| Expense of Energy Consumption, Per Annum |
14,080,000 RMB |
6,400,000 RMB |
| Economizing Expense, Per Annum |
Zero |
7,680,000 RMB |
System Components & Flow Legend
- 1. Evaporator
- 2. Condenser
- 3. Plate Heat Exchanger
- 4. MVR
- 5. Condensate Tank
- A. Liquor
- B. Product
- C. Condensate
- D. Fresh Steam
- E. Cooling Water
- F. Deaeration
Type Selection Criteria for Evaporation Plants
When we design evaporation plants, various requirements must be considered. These determine the type of design, arrangement, the resulting process, the cost of investments, and running expenses.
The most important requirements:
📋 Capacity & Operation Data
- Name of Product
- Feeding Concentration (dry materials %)
- Feeding Temperature
- Final Concentration (dry materials %)
- Evaporation Rate (T/h)
- If Crystallization, Requirement of Crystals
- Requirement of Controlling, Automatization
🔬 Product Properties
- Product Properties
- Viscosity and Flow Properties
- Tendency of Foaming
- Fouling and Precipitation
- Boiling Point
⚙️ Utility Requirements
- Steam Pressure / Temperature
- Temperature of Cooling Water Feeding
- Voltage / Frequency
- Unit Price of Steam (RMB/T)
- Unit Price of Electric Power (RMB/Kw)
🌡️ Waste Heat Parameter
- Waste Vapour Rate from Dryer
- Wet Bulb Temperature of Waste Vapour from Dryer
- Condensate Rate from Dryer
- Condensate Temperature from Dryer
- Liquefaction Vapour Rate
- Liquefaction Vapour Temperature
- Others
🔧 Selection of Materials
- Material of Heating Pipe
- Material of Tube Plate
- Material of Contacting with Liquor
- Material of Contacting with Secondary Steam
- Requirement of Surface Finish
💡 Energy Efficiency Options
- Multiple-effect Evaporation Plant
- TVR Evaporation Plant
- MVR Evaporation Plant
- Waste Heat Evaporation Plant
Frequently Asked Questions (FAQ)
Q
What is an MVR Evaporation Plant and how does it work?
An MVR (Mechanical Vapour Recompression) Evaporation Plant uses a centrifugal fan to recompress the vapour generated during evaporation to a higher pressure, raising its temperature. This recompressed vapour is then recycled as the heating medium for the evaporation process, dramatically reducing the need for external steam and lowering operational energy costs.
Q
What are the main energy advantages of an MVR evaporation plant over a multiple-effect evaporation plant?
MVR evaporation plants use electric power as the primary energy source instead of steam. Based on a 50 T/h evaporation rate example, a 4-effect evaporation plant costs approximately 14,080,000 RMB per annum in energy, while an MVR plant costs only 6,400,000 RMB — saving up to 7,680,000 RMB per year in energy expenses.
Q
Which industries are best suited for MVR evaporation plants?
MVR evaporation plants are particularly well-suited for the food and beverages industry (e.g., evaporation of milk, whey, and sugar solutions), the chemical industry (aqueous solutions), the salt works industry (saline solutions), and environmental protection applications such as the concentration of wastewater.
Q
How does evaporating temperature affect the power consumption of an MVR plant?
There is a direct relationship between evaporating temperature and power consumption. A higher evaporating temperature results in lower power consumption but increases fouling in the calandria. A lower evaporating temperature results in higher power consumption. Similarly, a larger heat exchange area reduces power consumption but increases the initial equipment investment.
Q
Can the evaporation rate of an MVR plant be controlled?
Yes. The MVR is powered by an electric motor, and its rotary speed can be precisely controlled using a frequency converter. By adjusting the rotary speed, operators can effectively control both the evaporation rate and the final concentration of the product in the MVR evaporation plant.
Q
What key information is needed to select the right type of evaporation plant?
Selecting the correct evaporation plant requires detailed information across several categories: capacity and operation data (product name, feed/final concentration, evaporation rate), product properties (viscosity, foaming tendency, boiling point), utility requirements (steam pressure, cooling water temperature, electricity pricing), waste heat parameters, material selection requirements, and preferred energy efficiency type (MVR, TVR, multiple-effect, or waste heat evaporation).
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