What is a multi-stage evaporator?

I think multi-level and multi-effect should be two completely different concepts. As the name implies, you can also know a little about multi-level! Let's ask an expert to answer.

Multi-stage evaporation should be used in continuous operation, while multi-effect evaporation is the recycling and reuse of energy.

Multi-stage evaporator is also a multi-effect evaporator. You can GOOGLE to find out. Different people have different names. Of course, a considerable number of people call it multi-effect multi-stage evaporator. Its essence is a multi-effect evaporator in terms of chemical engineering principles.

I'm confused. I'll understand when I look at the principles of chemical engineering. The editor from Tianjin University explained the principles very thoroughly. :handshake

What you said above is right, chemical engineering principles are the best

Multi-stage evaporator refers to multiple evaporators connected in series. The secondary steam flashed by the previous effect is used to evaporate the material in the next stage, so that the concentration of the material increases step by step to achieve the purpose of energy saving.

It uses the steam generated by the previous stage to heat the evaporator of the next stage.

Multi-stage evaporator is multi-effect evaporation, that is, the secondary steam evaporated by the first-stage evaporator is used as the heat source of the second-stage evaporator, and so on. According to the different flow directions of the evaporated medium, it can be divided into three types of evaporation: co-current, counter-current and cross-flow.

Thank you everyone (unfortunately, the level is low, so we can’t share it equally for the time being). I’ll go to Google to have a look: handshake

I think it should be the same concept. We generally come into contact with multi-effect evaporators. According to the flow direction of the material in the heating tube, it is divided into two types: falling film and rising film. According to the different directions of materials and steam, it is divided into two modes: countercurrent and downstream.

Multi-level means multi-effect, they just have different names.

Three-effect multi-stage evaporator uses: This equipment is widely used in the evaporation and concentration process of liquid materials in pharmaceutical, chemical, food, light industry and other industries. Features: This equipment adopts the working principle of tubular circulating external heating. The material has a short heating time, a fast evaporation speed, and a large concentration ratio, effectively maintaining the original effect of the material. The energy-saving effect is significant, saving about 70% of steam compared with a single-effect evaporator. Materials are evaporated and concentrated in a closed system, and the environment is clean and comfortable ； This system is equipped with a unique defoaming device to prevent material leakage. All parts in contact with materials are made of imported stainless steel and polished. The equipment has good corrosion resistance, is easier to clean, and is more in line with pharmaceutical and food hygiene regulations. It can be equipped with a microcomputer control system, which is easier to use and more stable. Technical parameters: Name\Model SJN-500 SJN-1000 SJN-1500 SJN-2000 SJN-3000 SJN-5000 SJN-8000 Steam capacity (clean water) kg/h 500 1000 1500 2000 3000 5000 8000 Steam consumption kg/h ≤200 ≤400 ≤600 ≤800 ≤1200 ≤2000 ≤3200 Overall dimensions (L×W×H)m 3×5×1.3 3.3×6.5×1.5 3.3×7×1.7 4×7.5×2 4.3×7.8×2 4.5×8×2 5×9×2.5 Circulating water consumption 5 10 13 15 18 25 40 Steam temperature first effect 0C 85~95 Second effect 0C 70~80 Third effect 0C 55~65 Steam pressure MPa ≤0.2 Vacuum degree MPa First effect 0.02~0.04 Second effect 0.05~0.06 Third effect 0.08~0.09 Concentration ratio 1.2~1.3

1. Multi-level means multi-effect； 2. It connects multiple evaporators in series to recycle steam. The black liquor adopts three types: cocurrent flow, countercurrent flow and mixed flow. Because it is difficult for an evaporator to meet the purpose of increasing the concentration too much