Natural Circulation/Rising Film Evaporators

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Natural Circulation / Rising Film Evaporator Operation
Natural circulation in an evaporator is caused by the thermal difference between the heating medium and the liquid. This thermal change is called "thermo-siphon action". Sufficient heat must be available to provide the necessary thermal difference to cause circulation.

Operating a Natural Circulation / Rising Film Evaporators is extremely simple. The body and tubes are partially filled with liquid and steam is admitted to the steamchest. Dilute liquid at the proper temperature is fed to the chamber below the lower tube sheet.

When the boiling point is reached, bubbles of vapor are formed in the column of liquid.  As they expand and increase in volume they push the liquid ahead with increasing velocity. As the upper part of the tubes is reached, the liquid is either in the form of drops or a film in contact with the wall of the tubes.

The mixture of vapor and liquid merges from the tubes and enters the upper chamber from which it passes through a short connection into the vapor separator. Concentrated liquid is removed from the bottom of the vapor separator as a finished product or to serve as feed for another effect.

Continuous operation is the ideal method of operating an evaporator, but there are processes where batch operation is necessary. Buflovak Natural Circulation / Rising Film Evaporators are adaptable to either application. The separator can be designed for any required holding capacity.

Evaporation, Distillation & Separation
Buflovak offers a line of evaporators to meet every processing requirement. The Evaporators are designed for use as single pass or recirculating, multiple effect or thermal recompression units as may be necessitated be desired product characteristics, product quality, operating efficiency, initial equipment costs and specific plant conditions.

Description
An EVAPORATOR is the descriptive name generally given to process equipment used to remove liquid by vaporization. The feed material may be a single liquid, liquid mixture, solutions or slurries, or any combination of these. Heat applied through some form or heat transfer surface is used to produce the vaporization. The concentrated product, as discharged, is still in fluid, pumpable form.

Distillation is the descriptive name generally given to process equipment used to separate a liquid mixture into separate components via vaporization and condensation. Buflovak designs systems using distillation in applications such as solvent recovery, product purification, solvent drying, VOC steam stripping, alcohol recovery, purification, and others. Our designs are determined through our years of engineering experience, process simulation and pilot testing.

Design and Construction
Buflovak designs evaporators to give distinct and profitable operating advantages for concentrating chemicals, food, pharmaceuticals, waste streams and a range of by-products. Various types, combinations of types, designs and materials of construction, can be recommended to best-fit specific applications. Many technical variables are involved in the design and fabrication of Evaporators. Buflovak, with over 100 years of experience, knows the answer to these variables.

Pre-assembled Systems
Buflovak evaporators are typically supplied as turn-key, skidded process systems, which include condensers, piping, pumps, vacuum equipment, instrumentation, controls, etc. The "systems" approach provides customers with a single source of responsibility for all the components needed for a given evaporator application. Buflovak's experience of supplying pre-assembled modules offers our customers a significant lower cost alternative to field installation.

HPS designs and manufactures Buflovak and Patterson Kelley custom processing equipment designed for your specific and unique application. Our equipment is designed for any industry, including Food, PharmaceuticalEnvironmental and Hemp.

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Buflovak / P-K
At Buflovak / P-K Process, we specialize in innovative, technology–driven solutions for the food, chemical, pharmaceutical, waste treatment, metals and glass industries. We are one of only a few worldwide offering product research and testing, the design and engineering of process equipment and systems, and manufacturing of complex one-of-a-kind and first-of-a-kind equipment and systems all at a single location. Buflovak LLC consists of specialized operating groups: Buflovak Rotating and Vacuum Thermal Process Equipment Group; Buflovak Separation Technology