Single Effect Ethanol crystalizer MVR Film Falling Evaporator
Multiple Effect Evaporation
The multiple effect evaporation processes can optimise the energy efficiency of facilities through the recycling of vapour.
Functioning
The vapour supplied during the first effect produces the vapour at a lower pressure. These vapours are then used in a second effect as a vapour heating steam.
The number of effects vary and can go right up to 8. The number of effects is chosen according to the investment and operating cost.
The vapours at the outlet of the last effect should be condensed.
Example Parallel flow principle
The solution enters the evaporator circuit of the first stage. Here it mixes with the circulated solution and is heated in heater H with steam. In the evaporator V1, solvent (water) evaporates while cooling the solution to the boiling temperature. The solution then flows to the second stage, which is operated under reduced pressure and thus at a lower temperature. The vapour generated in the first stage is used as a heating medium for evaporation of the solution in the second stage. This process can be repeated several times depending on the boiling point elevation of the solution and existing frame conditions. The vapour of the last stage is condensed via cooling water. If salt shall be crystallized in the plant, further evaporation concentrates the solution to such an extent that crystals are formed. If desired, the crystals in the suspension can then be separated from the solution and dried.
Suitable for any type of evaporator
The multiple effect evaporator can be made up of falling film, forced or flash-cooling circulation evaporators.
Application
This technology is great when the cost of vapour is low.
Major Advantages of Multi-effect systems:
Ability to maximize usage of input energy (steam economy)
Reduced energy required to run full system
Reduced condensing load with additional effects (less cooling water needed)
Liquor flow control
Convenient foul condensate collection and processing
Ability to do online cleaning of individual effects
Maximum thermal efficiency with concurrent flow option
Technical parameters of falling film evaporator
| Type | Single effect | Double effect | Three effect |
| Evaporative capacity (kg/h) | 300-2000 | 1200-4000 | 3600-15000 |
| Feeding material density % | According to material | ||
| Discharge material density % | According to material | ||
| Steam pressure | 0.5-0.8 | ||
| Steam consumption / Evaporative capacity(with heat pressure pump) | 0.65 | 0.38 | 0.28 |
| Evaporating temperature | 45-90 | ||
| Sterilizing temperature | 90-110 | ||
| Cooling water consumption / Evaporative capacity (inlet 20°C, outlet 40°C) | 28 | 11 | 8 |
| Note: we can design custom product according customer's requirement. | |||
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