Plate falling-film evaporator using heat exchanger plate as a heating element, each heat exchanger plate is made of two thin stainless steel plates, laser welding, drum pressure and other processes, made of a hollow plate-like heat exchanger element with uneven surface.

Main differences from tubular falling film evaporator

Three-dimensional flow spectrum curved surface heat transfer fabric liquid rely on gravity, in the plate outside the membrane downward flow, while the hot fluid (steam) to go plate cavity plate falling film evaporator by the shell, heating plate, distributor, defoamer, material liquid circulating pump and other components。

After the material liquid enters the evaporation system, the circulating pump sends the circulating material liquid to the distributor, and a uniform liquid film is formed on the outer surface of the plate. By gravity, the liquid film extends the outer surface of the heat transfer surface to flow downward, and at the same time by the heat evaporation, the secondary vapor from the surface of the liquid film escapes into the shell, upward flow, by the fog foam separation, into the next effect or vacuum system, and finally the concentrated liquid leaves the plate into the lower part of the cylinder liquid chamber space and then discharged.

The heated steam is distributed to the inner cavity of each plate through the collector box. Inside the plate cavity, the steam is gradually condensed into water and discharged from each plate, and the non-condensable steam that cannot be condensed is discharged to the vacuum system.

When heated vapors contain volatile materials that need to be recovered, the interior of the heating element is divided into a main condensing zone (clean zone) and a post-condensing zone (volatile condensing zone). In these units, heated steam is often introduced into the bottom chamber of the plate element (main condensing zone). The steam then flows upward and the condensate flows downward in the opposite direction. The condensate is vaporized in contact with the steam, and some of the volatiles are transferred to the vapor phase. All of this volatile-rich steam eventually enters the post-condensate zone in the upper part of the plate chamber and condenses completely, resulting in clean condensate in the main condensate zone and condensate enriched with light components in the post-condensate zone.

Extra-plate descending film with three-dimensional plate-like curved surface for heat transfer

The flow rate and flow direction of the liquid film is constantly changing, while strengthening the heat transfer, the liquid film is constantly redistributed, so that the cloth film is more uniform and less prone to scaling. Scouring of the liquid film and the trace deformation of the plate sheet, prompting the peeling of the plate sheet scaling.

Even if there is scaling on the outside of the plate, it makes descaling easy and cleaning time is short.

According to the material characteristics, plate specifications, etc., the reasonable design of the film circulation volume. Mature and reliable distributor structure design, so that the material is evenly distributed to all plates, forming a uniform liquid film, and is not easy to clog.

A specially designed defoamer unit minimizes the entrainment of secondary steam. The chamber is optimized for optimum distribution of secondary steam through the defoamer

Less prone to scaling

- Automatic repair of cloth film defects, reducing fouling

- The flaky scale formed on the outside of the plate has low adhesion and will partially peel off by itself.

High heat transfer coefficient

- Three-dimensional flow spectrum surface, so that the liquid film flow rate and flow direction is constantly changing, to enhance the liquid film heat transfer.

- The plate design facilitates the collection and removal of non-condensable vapor.

ong cleaning cycle

Convenient for mechanical cleaning

High heat transfer coefficients with small temperature differences, especially for MVR systems.

Special secondary steam passage, foam entrainment is reduced by more than 50% compared to tube type.

Plates can be grouped, can be applied to different heat sources at the same time can be used to self-steam design, to achieve the condensate scavenging diversion

Characteristics of system

• Lowest energy consumption and operation cost, electricity consumption of one ton water's evaporation is 2.2kw/℃.
• Temperature difference is small, heating is gentle, the loss of product is less.
• Compact structure and lower building cost; plant area is 50% less than that of traditional evaporator.
• Surrounding is friendly, no gas and no steam.
• Good adaptability in low loading condition, flexibility of operation is good and has a longer service life.
• Consumption of circular water is low and energy saving is obvious.
• No fresh steam is needed.
• Evaporation can be carried out under 40℃ and equipment need not to be frozen, specially suitable for thermal activity products.

Plate falling-film evaporator using heat exchanger plate as a heating element, each heat exchanger plate is made of two thin stainless steel plates, laser welding, drum pressure and other processes, made of a hollow plate-like heat exchanger element with uneven surface.。