What Is a Thin Film Evaporator?

Thin film evaporator is a type of evaporator, which is characterized in that the liquid of the material flows along the wall of the heating tube to perform heat transfer and evaporation. The advantages are high heat transfer efficiency, fast evaporation speed and short material residence time Therefore, it is particularly suitable for evaporation of heat-sensitive substances.

Thin film evaporator

Thin film evaporator is a type of evaporator, which is characterized in that the liquid of the material flows along the wall of the heating tube to perform heat transfer and evaporation. The advantages are high heat transfer efficiency, fast evaporation speed and short material residence time Therefore, it is particularly suitable for evaporation of heat-sensitive substances.

Chinese name

Thin film evaporator

Foreign name

Thin film evaporator

Belong to

A kind

Thin film evaporator is a kind of

Model / parameter	BM2.2	BM5.5	BM8	BM12	BM16
Evaporation area	2.2	5.5	8	12	16
Evaporation working pressure Mpa	0.4	0.4	0.4	0.4	0.4
Evaporation	140	350	550	850	1100
Steam consumption	155	385	605	935	1265
Equipment weight Kg	300	520	750	1020	1250
Overall dimensions mm	2000 * 650 * 3500	2300 * 800 * 3500	2700 * 950 * 4500	2900 * 950 * 5000	2900 * 950 * 5200

One. installation

1. The whole test has been carried out before the product leaves the factory. Users can hoist the whole equipment to the equipment foundation.

2. The equipment should be leveled as a whole, and the leveling position can refer to the upper plane of the reducer frame. And fix the equipment on the floor or steel frame.

3. For larger equipment, in order to increase the stability of the equipment, horizontal auxiliary support can be added to the appropriate part of the bottom flange. The auxiliary fulcrum only limits the radial displacement of the equipment and does not limit its axial displacement.

4. Prepare the pipelines according to the process requirements, clear the foreign bodies, clean the replacement equipment, and connect the power.

two. Preparation before starting

1. The product has undergone hydrostatic test and trial operation before leaving the factory, and the indicators meet the requirements of the drawings.

2. Jog the motor to check whether the stirring meets the rotation direction required by the drawing. Turn the top view clockwise and not reverse.

3. in

Low vacuum pressure drop:

materials

In the selection of thin film evaporators, various factors must be comprehensively considered, and generally need to be considered: ^[1]

MVR evaporator compared to other evaporators

Evaporation method	Reactor	Single effect evaporator	Multi-effect evaporator	Jet pump	MVR evaporator
Energy consumption	High energy consumption, about 1.5 tons of steam is needed to evaporate one ton of water	High energy consumption, theoretically 1 ton of steam is needed to evaporate one ton of water	Energy saving, generally speaking, as efficiency increases, energy consumption also decreases accordingly	One more effect on the basis of the traditional multi-effect evaporator, but it needs high-pressure steam to drive	The most energy efficient evaporator technology available. 15kw.h ~ 100kw.h power consumption is needed to evaporate per ton of water
Area	small	small	Big	small	small
Impact on product quality	Evaporation product stays for a long time, which seriously affects product quality	Short residence time, high temperature, low impact on product quality	Longer residence time, higher temperature, less impact on product quality	Short dwell time with minimal impact on product quality.	Short residence time, low temperature difference evaporation, minimal impact on product quality
Energy method	Direct heating with coal or diesel; or steam heating	Uses steam for heating, requires steam pipe network, requires boiler	Uses steam for heating, requires steam pipe network, requires boiler	Need high pressure evaporation to use, need boiler	Use only electricity, no need for steam pipe network, fully self-closing cycle system
Degree of self-control	Manual operation	Semi-automatic	Semi-automatic	Semi-automatic	Fully automatic control operation, uninterrupted evaporation
stability	difference	Worse	Worse	Worse	it is good

The material enters the horizontal evaporator continuously from the large-diameter end, is accelerated and distributed by the scraper film and immediately forms a thin flowing film on the heating surface. The conical thin-film evaporator depends on a centrifugal force exerted by the rotor on the material. This centrifugal force has two effective forces, one perpendicular to the heating surface and the other towards the large-diameter end body (note: the same results also appear in the vertical cone type In the thin film evaporator) rely on these forces to produce material acceleration, and the incoming material ensures that the heating surface is sufficiently humid, independent of the evaporation ratio or the feed rate. As a result, local material overheating and thermal degradation are reduced or completely eliminated.
During this process, the light components (low-boiling matter) pass through the horizontal thin-film evaporator (in the same direction as the liquid film) and enter the vapor-liquid separator, where the droplets and foam produced by vapor-liquid separation are Crush into the liquid phase (high boilers), the separated vapor enters an external condenser or the next process; the reconstituted portion (high boilers) climbs along the heating wall to the small end outlet and is discharged.