Heat Exchangers
Redecam’s RF Air-to-Air Heat Exchangers are suited for clinker cooler dedusting or for integrated systems applications in which one filter dedusts both kiln ends.
The RF heat exchanger decreases the temperature of the gas resulting in a reduced flow to be handled by the system, providing:
- increased stability of the pressure at the clinker cooler outlet
- cost-effective design of the equipment; smaller size of filter, exhaust fan, ducts and stack
- reduced power consumption even when operating under upset conditions

These features result in enhanced plant operation and reduced operating costs.


RF Model
The process flow normally enters the heat exchanger through the hood on top, passes through the tube modules (vertical pipes) and leaves through an opening located in the hopper. The dust that drops from the gas flow settles in the hopper below the tube nest.
The RF arrangement consists of vertical tubes bundles within a structural frame.
Side panels are fitted to the lateral faces of the outer modules to ensure the airflow from the axial fans passes through all the rows of tubes.
The intermediate tube-sheets concentrate the airflow from each row of axial fans and allow the tube thermal expansion, preventing assembly stress and deformation.
The fastening at the bottom position is guaranteed by a fiber seal pressed around the tube by a collar.
Pipes are fixed at the top tube-sheet, where a replaceable insert is installed on each tube inlet to limit the abrasion impacts.
Several tube modules are arranged in parallel with the axial fans fitted on the front modules. Module sizes are designed to be transportable on common carriers.
The axial fans and housings are fitted directly on the front modules, blowing the ambient air horizontally to the tubes. All fans are easily accessible for inspection and maintenance from walkways and stairs.
The number of blades varies between five and ten depending on the required pressure and maximum noise level. The blades are extruded, light alloy made with an adjustable pitch.
Drives can be either belt driven, direct mounted or through a motor-reducer; the fans control can be fixed speed, two-speed, or variable speed.


RF-DP Model
The differential temperature is very important in the integrated systems, where kiln gas and cooler exhaust air are mixed upstream the heat exchanger. Since both water and acid dew point can be relatively high, the tight control of the HE tubes wall temperature is necessary to prevent condensation, pipe plugging and corrosion.
In such cases, Redecam installs the RF-DP model, a double-pass heat exchanger.
In this model of HE the wall temperature remains above the dew point along the tubes. The gases first pass downward through the front columns of modules, then they are redirected to the top and pass downward through the rear tube modules. Its performance is excellent, tubes remain perfectly clean.
The duct/box dedicated to the second pass can be used also as a mixing chamber for both the emergency bleed air and the raw-mill gases.