概述
In a conventional evaporator, vapour is boiled off using fresh steam and then condensed and thrown away, taking its latent heat with it. Mechanical vapour recompression takes that vapour, compresses it slightly to raise its condensing temperature, and feeds it back as the heating medium.
The effect on energy consumption is dramatic. A well-designed MVR evaporator typically uses 90 to 95% less primary energy than a single-effect steam evaporator, because after start-up almost no fresh steam is required at all.
主要优势
Up to 95% less energy
The latent heat is recycled rather than dumped into a cooling tower.
Little or no live steam
After start-up, most MVR plants need only the compressor's electrical input.
Smaller cooling load
No large condenser duty, which removes cooling tower capacity and water consumption.
Engineered to your process
Selected from your evaporation rate, boiling point elevation and product properties.
工作原理
从蒸发器出来的蒸汽被压缩，温度因此升高，这股更热的蒸汽再被用来加热同一台蒸发器。热量在循环，而不是重新制造。
它替代掉的是蒸汽。采用机械蒸汽再压缩的蒸发器，能耗可以只有锅炉供汽的一小部分，因为热量是被搬运的，不是被生成的。
压缩机就是整台机器。它是按那种蒸汽定规格的，不是按空气，这会改变材料、密封和控制方案。
- Vapour compressed and reused as the heat source
- Replaces most or all of the steam demand
- Energy moved rather than generated
- Compressor specified for the vapour
- Fan or screw type by duty
- Materials selected for the process liquor
- Integrated with the evaporator controls
- 性能有保证并经测试
在您的工厂值不值得做
It suits a continuous evaporation duty with a steady load and a lot of annual hours. It does not suit a batch process that runs three months a year.
We size it against your evaporation rate, your boiling point rise and the hours you actually run, and we show the figures against what you spend on steam today.
If the payback is poor we will say so. An honest no on this is worth more than a hopeful yes, because the capital involved is significant.
- Suits continuous duty with high annual hours
- Sized on evaporation rate and boiling point rise
- Compared against your current steam cost
- 在您决定之前先给出回收期
- 不划算的时候会给出诚实的答复
- Integration with existing plant designed
- 加装计量，节省是实测出来的
- 由我们自己的团队调试
配件与服务
Seals, bearings and the wetted parts, with intervals set by the liquor rather than by a general rule.
Fouling on the vapour side is the quiet failure. Performance falls, the steam valve opens to make up the difference, and the saving disappears without any alarm.
We record compression ratio, power and steam make up at every visit so the system is proved to still be paying for itself.
- 按周期更换的密封件与轴承套件
- Intervals set by the process liquor
- Vapour side fouling checked at every visit
- Steam make up recorded as the real measure
- Compression ratio and power logged
- 大修围绕您的停机安排
- 调试时商定现场备件
- 服务方案下固定价格
常见问题
What is mechanical vapour recompression?
Taking the vapour a process gives off, compressing it slightly, and using its own recovered heat to drive the evaporation instead of fresh steam.
Why does it save so much?
Because compressing vapour costs far less energy than raising steam. Typical systems return five to twenty times the energy they consume.
Where is it used?
Evaporation and concentration, dairy, sugar, chemicals, desalination and effluent treatment. Anywhere a lot of water is being boiled off continuously.
What machine does the compression?
A high-flow, low-ratio machine (a turbo fan, a centrifugal or a screw compressor), chosen for the vapour flow and the temperature lift needed.
How much lift can it give?
Usually a few degrees of temperature rise, which is all the process needs. Large lifts are inefficient and normally point to a different design.
Does it replace the boiler?
It replaces most of the running steam demand. A boiler is still typically needed for start-up and top-up duty.
What is the payback?
On a continuous evaporation plant, often two to four years. Running hours are what decide it: an intermittent process rarely justifies the capital.
What is the main risk?
Fouling and carry-over on the compressor. Vapour quality, droplet separation and material selection are where these projects succeed or fail.
Can it be retrofitted?
Sometimes, on an existing evaporator, but it must be studied properly. The evaporator's temperature difference decides whether it will work at all.
How do we assess it?
With a mass and energy balance on the existing plant. We would rather tell you it does not suit than sell a system that underperforms.
相关产品
不确定该选哪个型号？
把您的用气量、工作压力和运行小时数发给我们。我们的工程师会完成选型并给出书面建议，不收费，也不构成任何义务。