Application Scope:
The horizontal-tube falling-film evaporator is primarily used for evaporation and concentration of low-concentration wastewater, including landfill leachate, ammonia-nitrogen wastewater, seawater desalination, and waste liquid recovery.

Working Principle:
Also known as a horizontal-tube spray falling-film evaporator, this system evenly distributes feed liquid from a spray distributor onto horizontally arranged heat exchange tubes. The liquid partially evaporates by absorbing heat from the condensing steam inside the tubes. The unevaporated portion flows downward by gravity to the next row of tubes and eventually collects at the bottom of the evaporation chamber. This solution is then recirculated via a pump for repeated spray evaporation until the desired concentration is achieved. The secondary steam generated is extracted from the top, compressed to increase pressure and temperature (enhancing its enthalpy), and then introduced into the heat exchange tubes for condensation. This process involves dual-phase change heat transfer: evaporation on the tube exterior and condensation inside the tubes.

Main Features:

● High heat transfer coefficient (twice that of vertical-tube falling-film evaporators and three times that of flash evaporation systems).

● Minimal thermal gradient loss, eliminating temperature loss caused by static liquid head-induced boiling point elevation.

● Ideal for foaming-prone materials and low-temperature evaporation/concentration.

● Easy visual monitoring of heat exchange conditions.

● Unsuitable for crystallizing or scaling-prone solutions.