Forced Circulation Evaporator

In a Forced Circulation Evaporator, liquor is pumped from the bottom cone of the vapor body through the tubes of the heat exchanger, where heat is added, and back into the vapor body where evaporation occurs.

Sufficient liquid height (submergence) is maintained above the liquor inlet on the vapor body and above the heat exchanger tubes to suppress mass boiling in the inlet and prevent boiling at the tube surface. This is necessary to prevent precipitation in the tubes which would lead to fouling of the heat transfer surface.

A high circulation rate is provided for adequate tube velocity to achieve good heat transfer. Therefore, lower temperature rises are assured which minimize supersaturation of the solution. The circulating pump is usually of the axial-flow, single-elbow design, well-suited for the high flow rates and low pressure drops in ZONTEN designed circulating systems. These heavy duty pumps operate at low speeds, which minimize erosion and reduce maintenance.

Circulating piping interconnects the vapor body, the heat exchanger and the pump. Conical liquor chambers provide gradual, low pressure drop transitions from the circulating piping to the tube bundle which is particularly important for the establishment of uniform feed to the tubes. To provide for thermal expansion without expansion joints, the circulating pump base is spring mounted. As an alternative, the entire pump may be hung from the circulating piping.

The vapor body is conservatively designed both in diameter and height. It is important to have an adequate free space above the liquor level to allow the liquor droplets entrained in the vapor leaving the boiling surface to reach equilibrium and return by gravity to the circulating slurry. The large diameters result in low vapor velocities which minimize entrainment. A mesh type entrainment separator is typically installed in the upper portion of the vapor body to reduce entrainment.

Heat exchangers can be located on the discharge or suction side of the circulating pump. In some cases, both discharge and suction side heat exchangers have been provided in the same circulating system to maximize heat transfer surface. Multiple circulating systems can be supplied for the same vapor body on large evaporators.
A wide variety of forced circulation evaporator designs are available, tailored for the particular application.

Features

Fouling of tubes is minimized
High Recirculation is to be maintained inside the tubes by recirculation pump.
High TDS and viscous liquid concentration

Application

High TDS Effluent Concentrate
Tomato Juice concentrate
Brine liquid concentration
Recovery of metal salts
Concentration of Pharma and textile effluent

ZONTEN can design and supply many different types of equipment to achieve processing requirements.
Our specialty is designing and installing innovative systems to convert liquid solutions into dry solids using evaporation, crystallization and drying.

Pls let us know below information, so that our engineers team will help you design an exellent solution for you!

        Shanghai ZONTEN Environmental Protection Technology Co., Ltd is a New Hi-tech Enterprises, specialized in developing, designing, manufacturing, installing & commissioning MVR Evaporator with 10,000 square meter working plant.

        We are a perfect organization, ISO9001-2008, ISO14001, OHSA18001, OHSAS18001:2007 past, Evaporation & Crystallization Member of CPCIF (the China Petroleum and chemical industry association). We warmly welcome you visit us.