CENO biogas roof with integrated storage
The traditional tower-supported tank covering with integrated storage function.
Outer shell providing protection against climatic conditions
As in the case of a tent, the outer membrane is stretched between the central tower and the tank edge. The tension of the membrane is not created by pulling the membrane over the tank edge, but by using the telescope-like, adjustable tower. This serves to create an even pre-tension of the membrane while saving it in the tank edge area.
The membrane is biaxially arched providing additional stability to the membrane while being tensioned and avoiding fluttering and pumping in the wind. This contributes substantially to the longevity of CENO biogas roofs.
With the help of clamping rails the outer and inner membranes are clamped to the tank in such a way that they are leak-proof and will never tear out.
The outer membrane represents the building. It absorbs all external loads such as wind, snow and climatic conditions.
The actual gas storage is located inside and thus protected against atmospheric conditions
Inner shell for gas storage
The inner membrane represents the gas-proof covering of the fermenter. The gas chamber is located between the inner membrane and the soil. During normal operation, the inner membrane is not stretched but floats below the outer membrane in different heights depending on the filling level.
Tower
Using the epoxy-coated steel tower the biogas roof is pre-tensioned and external loads are transferred.
Measuring the filling level
The position of the inner membrane is measured by rope length measuring systems The measured values can be transformed into filling level values and serve for the plant control.
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Storage volume
The storage volume results from the tank diameter and the slope of the roof.
Working pressure
During normal operation there is a slight overpressure inside the gas chamber which is caused by the weight of the floating inner membrane. The pressure inside the gas chamber is limited by the overpressure valve.
Membrane material
Membranes are made of polyester fabrics which are PVC-coated on both sides. Different membrane types are used depending on static requirements, statutory provisions and customer requirements.