Back-Pressure Cooler
The back-pressure cooler is particularly suitable for granular and free-flowing bulk materials. It is a contact back-pressure cooler where the bulk material to be cooled slowly passes along the cooling surfaces. Cooling is achieved in a counter-current cooler using water, with no direct contact between the water and the bulk material.
A high heat transfer rate is ensured through a special design of the contact points between the cooling fins and coils. The temperature of the cooled bulk material is kept constant through automatic water flow control and is continuously monitored.
The back-pressure cooler is compactly built, with 260 m² of cooling surface housed in a 1 m³ cooler. This results in high cooling efficiency in a confined space. Furthermore, the modular design allows for subsequent increases in cooling capacity. The total cooling surface is optimally utilized, as a patented dosing valve guarantees even distribution of the bulk material across the cooler’s cross-section.
The back-pressure cooler can also be used to heat free-flowing bulk materials.
Functionality of the Back-Pressure Cooler
Single-Stage Cooling:
The material to be cooled enters the cooling unit from a hopper through an inlet box and a screen. Below the cooling unit, there is a stationary part and an adjustable part of the dosing valve. Depending on the desired cooling capacity, the dosing valve is adjusted. This ensures that the material flows evenly across the entire cross-section of the cooler and at the prescribed speed through the cooling unit. The cooled material collects in the outlet container. A temperature sensor located between the cooling unit and the dosing valve regulates the bulk material’s temperature via the cooling water control valve. A contact thermometer is activated only when the maximum permissible and preset temperature of the cooled bulk material is exceeded. In such a case, the cooler outlet is locked, or visual and/or audible warnings are triggered.
Two-Stage Cooling:
In this configuration, the cooling unit is supplied with water through two separate cooling water circuits. A dedicated water circuit cools down the peak temperatures of the bulk material. This second water circuit operates similarly to the single-stage cooling system, with a display thermometer replacing the contact thermometer.
