Abstract
This study investigates the compressive strength of natural gas hydrate (NGH) pellet strip extruded from die holes of a twin-roll press for continuous pelletizing (TPCP). The lab-scale TPCP was newly developed, where NGH powder was continuously fed and extruded into strip-type pellet between twin rolls. The system was specifically designed for future expansion towards mass production of solid form NGH. It is shown that the compressive strength of NGH pellet strip heavily depends on parameters in the extrusion process, such as feeding pressure, pressure ratio, and rotational speed. The mechanism of TPCP, along with the compressive strength and density of pellets, is discussed in terms of its feasibility for producing NGH pellets in the future.
Highlights
Natural gas hydrate (NGH), widely known for its selfpreservation effect [1], remains in a metastable state or quasiequilibrium under atmospheric pressure and subzero temperature
The compressive strength of NGH pellet extruded by a twin-roll press for continuous pelletizing system is investigated
The NGH powder was first produced by a laboratory-scale hydrate reactor
Summary
Natural gas hydrate (NGH), widely known for its selfpreservation effect [1], remains in a metastable state or quasiequilibrium under atmospheric pressure and subzero temperature (below −20∘C) This property provides a solid background for the massive-scale exploitation of NGH and the development of pertinent technologies in storage, handling, and transportation. Experimental results show that the mechanical strength of NGH pellet extruded by the TPCP system mainly depends on the rotational speed of the twin roll and overhead feeder pressure. This investigation result can be used as a background data for designing a mass production system of NGH pellet and loading/unloading mechanism for NGH ships in the near future
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