DODGEN

Falling Film Evaporator

Efficient low-temperature evaporation that improves product quality and yield.

Falling Film Evaporator Introduction

The falling film evaporator features a precision structure, mainly consisting of the evaporation body, liquid distribution and membrane laying system. . Its core lies in the precision liquid distribution device at the top, which evenly distributes the feed onto the inner walls of vertical heating tubes to form a uniform downward-flowing liquid film. Heating medium flows outside the tubes for efficient heat exchange, and the liquid film inside the tubes evaporates rapidly. The generated vapor–liquid mixture is separated at the bottom to obtain concentrated liquid and secondary steam, respectively. Precision manufacturing and extremely high verticality of the whole unit are key to ensuring stable film formation and efficient operation.

Equipment Structure

The high efficiency of the falling film evaporator comes from its precision modular structural design, mainly including the following key components:

1
Precision liquid distribution system

located at the top of the equipment and is the performance core. High-precision distributors and film-forming devices ensure uniform distribution into each heating tube, forming a stable and continuous falling film.

2
Vertical heating chamber

composed of the shell, tube sheets, and vertical tube bundle. The heating medium releases heat while flowing outside the tubes; the liquid film inside the tubes evaporates rapidly after heating, enabling efficient heat transfer.

3
Key support structure and internals

mainly include the upper and lower tube sheets used to fix the tube bundle. Their extremely high flatness and verticality are the basis for uniform distribution and stable film flow.

4
Integrated auxiliary systems

including preheaters, vacuum systems, condensers, and CIP cleaning systems, ensuring stable and continuous operation of the evaporator under optimal conditions.

Equipment Manufacturing

Manufacturing of DODGEN falling film evaporators starts with accurate conversion of process design and strictly follows rigorous quality-control standards. The manufacturing process begins with precision cutting of high-quality metal materials. The key lies in high-precision machining of tube sheets, liquid distributors, and film-forming devices, as well as weld deformation control, to ensure excellent film distribution performance. Automated welding is used to achieve precise assembly of the tube bundle and shell, combined with multiple NDT inspections and pressure tests throughout the process. Finally, strict factory acceptance testing ensures each unit has reliable sealing performance, stable operating efficiency, and long service life.

Manufacturing Advantages

With refined control across the full chain of “process–manufacturing–installation,” DODGEN Equipment has established the following key advantages in falling film evaporator manufacturing:

1 Accurate upstream process design

Accurate parameter calculation: based on material properties and operating conditions, precisely design key parameters such as minimum wetting rate, tube diameter, gas–liquid velocities, and heat-transfer area. Precise circulation-rate verification: ensure complete wetting of the inner wall of heat-transfer tubes, fundamentally avoiding dry wall phenomena and ensuring stable evaporation. Core performance pre-control: design guided by outstanding distributor performance to ensure optimized operating performance. Experience-based revalidation and optimization: all designs undergo secondary verification and optimization based on engineering practice to determine the optimal process and structural parameters.

2 Precision manufacturing of internals and structure

High-precision machining of key internals: liquid distributors and film-forming devices adopt precision machining to ensure uniform distribution and stable film formation. Strict flatness control: extremely high flatness requirements for tube sheets and distributors provide a basis for uniform liquid distribution. Special weld deformation control: special fixtures and process measures are used during tube-sheet welding, with real-time deformation monitoring to ensure critical geometric tolerances.

3 Professional on-site installation assurance

Ultra-high verticality requirements: strictly implement installation verticality standards to ensure uniform film flow and achieve the best heat-transfer and evaporation performance. Standardized operating procedures: with a professional installation team and standardized procedures, ensure the equipment meets or exceeds the designed performance on site.

4 Full-chain synergy advantage

Achieve seamless connection from theoretical design and precision manufacturing to standardized installation, ensuring every DODGEN falling film evaporator delivers outstanding quality that is high-efficiency, stable, and long-lasting.

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