How the GSK.9 came about – A compact counterflow cooler for tight spaces and high process stability
The GSK.9 was developed in response to a clear market requirement:
Many system operators need a counterflow cooler that is not huge, not heavy, but compact, space-saving and still powerful.
Such coolers were hardly available – especially not with pneumatic full-surface discharge and stable process control.
A customer needed a solution for limited space where standard appliances would neither fit nor run with process stability. This is exactly what led to the development of the GSK.9 – a cooler that only requires a footprint of 900 × 900 mm and still enables a cooling capacity of up to 2,000 kg/h.
Flyer GSK
Why the small cooler was necessary at all
The customer faced several challenges:
- Standard radiators were too big and too heavy.
- The existing appliances required a lot of headroom.
- Poorly designed discharge systems often lead to material bridges.
- The cooling capacity was not reproducible.
- Integration into a compact container or hall installation was hardly possible.
A new cooler was needed that was specially designed for biomass, granulates and pellet-like products – and at the same time would fit into the tightest of spaces.
The solution: a cooler with a clear structure and special technical features
- Compact design (900×900 mm) with stainless steel housing
The GSK.9 was deliberately designed to be small.
It consists of:
- Housing made of stainless steel EN 1.4404 for high corrosion resistance
- solid steel frame S355JR as welded construction
- a total weight of only approx. 435 kg
1001359_GSK.9_KZG
So it fits in:
- Container systems
- Existing lines
- Mobile or modular systems
- small production rooms
- Pneumatic full-surface discharge system (“sliding grate”)
This is the heart of the GSK.9.
The pneumatically operated sliding grate ensures:
- Full-surface emptying, no dead zones
- No product bridging
- uniform discharge
- Defined dwell time in the cooler
It works with position sensors that inform the control system exactly about the position of the grate.
This ensures a stable, controlled cooling process.
- Three adjustable level sensors – precise process control
Three sensors are located directly at the maintenance opening:
- Min sensor → Starts the filling process
- Max sensor → Controls the discharge (“start/stop radiator draining”)
- Overfill protection → Protection against back-up and system overpressure
The sensors are manually height-adjustable, allowing the dwell time to be precisely adjusted.
- Rotary valve (0.75 kW) for airtight, separate product supply
A central point in counterflow cooling is the avoidance of secondary air.
The GSK.9 uses a rotary valve made of stainless steel, directly coupled to a 0.75 kW motor.
prevents:
- Air intake from outside
- False currents
- Cooling losses
This ensures a clean cooling air flow in terms of process technology.
General description counter flo…
- Optimized cooling process through defined air flow
The cooling air flows from bottom to top through the bulk material – classic counterflow principle.
The cooler uses:
- a defined air flow
- a rectangular exhaust air connection
- a manual or optional automatic flue gas flap
The following applies as a guideline (according to the documentation):
- 2000 m³/h cooling air per ton of product per hour at ~80 °C inlet temperature.
General description counter flo…
These clear parameters make the process reproducible.
- Very good service accessibility
The transparent maintenance door gives you:
- Direct insight into the cold air zone
- Optimum access for cleaning and inspection work
- Clear view of sensors, discharge and internal mechanics
The result – a compact cooler with great performance
The GSK.9 is not a scaled-down standard cooler.
It is a tailor-made device for situations where space is at a premium but process quality must not suffer.
It offers:
- Compact dimensions
- High cooling capacity
- Stable temperature control
- clean material flow
- Flexible dwell time
- Robust stainless steel construction
- fully controllable discharge
- Low operating costs
This closes a gap in the market between “too big” and “too weak”.
The GSK.9 shows that innovative cooling technology doesn’t have to be big – just well thought out.
