Guided radar sensor VEGAFLEX steams ahead to ensure efficient process heat supply

Steam is a hot business. Flexible, sterile and reliable, it is a particularly efficient carrier of thermal energy – absolutely ideal for energy-intensive processes. Saturated steam, as used by DSM, transports  24 times the energy of the same amount of hot water. Level control is the crucial factor determining the efficiency of the boiler system. To get the most out of the available energy, the system processes have to be continuously monitored and evaluated.

At the DSM site in Visp, Switzerland, they specialise in food additives, and 30 % of the energy needed for their processes is made by generating steam. The energy production process ranges from the combustion of waste materials, as well as the typical stages of steam generation, right through to complex flue gas cleaning systems. The combustion chamber, which supplies the energy for the steam boiler, extends over three building floors at DSM. At a temperature of 190 °C, the boiler generates saturated steam at 13 bar pressure, increasing the specific volume of the water by 15 % compared to its specific volume at atmospheric pressure. The level values in the boiler, which supplies the steam distribution system, requires perfect balancing. It needs to be meticulously controlled according to preset, fixed safety parameters.

"Every vessel connection we can avoid is an advantage for us," says Christoph Fux, senior process control engineer responsible for automation, explaining the potential risk of leaks. Theoretically, any kind of installation can lead to steam leakage and the additional work and high costs associated with it. The combination flange simplifies not only setup and commissioning, but also maintenance and servicing.

Christoph Fux is quite pleased with the new solution, as it contrasts strongly with his recent negative experience with capacitive based measurement at the same location. The steam generation system has been running smoothly and safely ever since.