Modelling of heat and mass transfer during reactor pressure relief or storage tank breathing into the metastable fog region
In the Industry, large amounts of hazardous liquids or chemicals are stored in tanks, e. g. LNG, hexane or formic acid. The geometry of the tanks and the storage type is different. Depending on the liquid, some tanks have to be heated up or cooled down. The fluids are usually stored under atmospheric conditions or small overpressure. During normal operation, there is a phase equilibrium between the gas and the liquid phase in the storage tank. Therefore, the tank safety mostly depends on the pressure of the gas phase inside the tank. The wall thickness of atmospheric or low pressure vessels usually is very small, only a few millimeters, so that it can withstand only small under- and overpressure. Consequently, the risk of implosions or explosions of those storage tanks is very high. Not permitted internal pressures can arise due to energy input and output through sudden weather changes (sun, wind, rain) or filling up a tank with hot liquids.
The aim of the ARTEM project is to describe the phenomena of vessel venting very precisely in a CFD-simulation to develop an easy calculation model, the Advanced Reactor and storage Tank Emission Model (ARTEM). Included are effects like fog formation inside the tank, condensation at the vessel wall, heat transfer through the tank wall or material transition between the gas and liquid phase. The simulation and the calculation model will be validated with measurements on big storage tanks.
PhD-Project in the scope of the CSE Research Areas: Safety Modelling | Experimental Safety
Begin June 2017 / Project Duration 4 Years