The super sludge project is an extremely innovative project in which sewage sludge is removed from harmful components. This is realized through a process in which the sludge is treated in a supercritical state. In this way the harmful substances can be removed. The entire installation consists of a number of components such as a pump, heat exchangers and vessels.

Heat is recovered in the sludge heat exchanger by preheating the incoming sludge with the outgoing flow. This is a double pipe heat exchanger. The sludge in the heater reactor vessel is then brought to an even higher temperature, after which the reaction takes place in the reactor vessel. The flash vessel and the cyclone are also part of the whole process. These are all barrels. The flash vessel and cyclone consist of a drilled out forging with special closure. The heater reactor and reactor are solid forgings with drilled channels. The heater reactor has a groove on the outside with an electric heater spiral.

The supersludge project is very innovative and has a major impact on the future processing of sludge. In this pilot, a full-scale installation is being built and tested. Because the sludge has to be brought into a supercritical state, there is high pressure and high temperature. This combination, together with the corrosive character of the sludge, creates the challenge. The heater reactor took the cake. Material creep temperatures, high pressure and the use of a coil around the vessel necessitated a FEM analysis. The heat-technical calculations were carried out in close collaboration with the client and the spiral manufacturer. Because it concerns a test setup in which various parameters are to be measured and the sludge is considered to be very polluting, accessibility and cleanability were required. Special high-pressure closures have been designed for this. Through good cooperation, pushing the boundaries, and the ability to be innovative, the professionals of ROBOX have contributed to the realization of this project.