Intensification of Gas Hydrate Formation Processes by Renewal of Interfacial Area between Phases

Abstract

This paper presents the analysis of the main reasons for a significant decrease in the intensity of diffusion processes during the formation of gas hydrates; solutions to this problem are proposed in a new process flow diagram for the continuous synthesis of gas hydrates. The physical processes, occurring at the corresponding stages of the process flow, have been described in detail. In the proposed device, gas hydrate is formed at the boundary of gas bubbles immersed in cooled water. The dynamic effects arising at the bubble boundary contribute to the destruction of a forming gas hydrate structure, making it possible to renew the contact surface and ensure efficient heat removal from the reaction zone. The article proposes an assessment technique for the main process parameters in the synthesis of hydrates based on the criterion of thermodynamic parameters optimization. The optimization criterion determines the relationship of intensity of heat and mass transfer processes at the phase contact interface of reacting phases, correlating with the maximum GH synthesis rate, and makes it possible to determine optimum thermodynamic parameters in the reactor zone.

Gas Hydrate in Oil-Dominant Systems: A Review

“…Hammerschmidt et al reported that hydrates in the production or transportation pipeline are among the most significant concerns in oil and gas flow assurance. Thus, the oil and gas sector constantly seeks ways to avoid hydrate formation in pipelines to avoid blockages and potential danger. , The base of hydrate inhibition in thermodynamic hydrate inhibitors (THIs) keeps the operation system’s temperature and pressure out of the hydrate formation region. The system conditions can be shifted from a hydrate-stable zone to a hydrate-free zone by heating, employing insulated pipelines, and depressurization .…”

Numerical Modeling of the Behavior of Bubble Clusters in Cavitation Processes

“…The behavior of an individual bubble inside a cluster under identical conditions and identical influences on the system differs from the behavior of a single bubble, and the difference is more noticeable with the higher concentration of bubbles in the cluster N. The reason for the difference in behavior is due to the fact that, other things being equal, the bubble in the cluster is under the influence of pressure created by other bubbles and which depends to a small extent on the pressure applied to the system. The authors of [84] also point out this pattern. Figure 8 shows how the average pressure p l * in the liquid in the interbubble space changes after an instantaneous release of external pressure from the initial equilibrium value of 60 kPa to 20 kPa.…”

A New Method for the Rapid Synthesis of Gas Hydrates for their Storage and Transportation

“…However, the rate of gas hydrate formation was not high, and the process itself cannot be continuous, due to the fact that gas bubbles with a hydrate crust agglomerated into large complexes, where the synthesis practically stopped. Gas mixing, spraying and bubbling are known methods of GM synthesis intensification [43]- [45]. Mixing helps to mix the gas and liquid phases and increase the phase interface surface, increasing GM synthesis rate.…”