Modular Vitriﬁcation System (MVS®)
Kurion’s Modular Vitrification System (MVS®) is a single-cycle, inductively heated, melt-in-the-final-container system. MVS® has the potential to offer cost, schedule, and safety advantages over competing vitrification technologies due to its ease of scalability, waste insensitivity, ability to receive either dry solids or slurry feed, absence of molten glass pouring, viscosity independence, and wider range of process temperatures.
75 Test Runs have been performed to date at Lab Scale (products are 3" x 19 " glass ingots).
Kurion is working with Pacific Northwest National Laboratory (PNNL) to demonstrate this technology on radioactive waste and radioactive waste simulants.
The MVS® Module Sub-System is the heart of the system. The Module is both the inductively heated melter and the disposal container for the vitrified waste. The Module consists of four nested cylinders/layers that perform specific functions for melting the waste and protecting workers and the environment.
- The outermost cylinder is typically a stainless steel shell, as it is the most commonly accepted final disposal canister by our customers’ final disposal sites
- Next, an insulating layer protects the stainless steel from heat generated during the melting process
- The third concentric cylinder is a graphite susceptor that is inductively heated
- The susceptor is protected from being oxidized and corroded by the vitrifying waste process by a proprietary fourth layer
Continuous Fill, Sequential Melting
Once the Module Sub-System is introduced into the Module Heating and Cooling Sub-System and connected to the Module Fill-Head Sub-System, the vitrification cycle starts, controlled by the Control Sub-System. The inductive coil, a component of the Module Heating and Cooling Sub-System, inductively heats the appropriate section of the graphite susceptor starting from the bottom of the cylinder. The molten glass pool is approximately a few inches deep. Feed (either dry or slurry, depending on the application) is delivered by the Feed Preparation Sub-System to the Feed Metering Sub-System and finally dropped through the Module Fill Head Sub-System onto the molten glass pool, causing the pool to rise. The molten pool typically rises at a speed of a few inches per hour, monitored by the Module Level Control Sensing Sub-System. The Module In-Process Integrity Sensing Sub-System ensures that the integrity of the Module Sub-System is maintained during the entire fill process. Water vapor and other off-gases formed during the melting process are evacuated and treated by the Off-Gas Sub-System.
As the pool rises, product under the molten pool gradually solidifies into an acceptable glass form. During the process, the Module Heating and Cooling Sub-System actively cools the outer stainless canister.