Modelling and experimental study of hydrate formation kinetics of natural gas‐water‐surfactant system in a multi‐tube bubble column reactor

Abstract

To promote the heat and mass transfer during the hydrate formation process, an internal spiral-grooved tube (ISGT) was proposed as the reaction tube in a large-scale multi-tube bubble column reactor with external slurry circulation. In order to investigate such multi-component gas (natural gas)-water-surfactant systems during the hydrate formation process in the ISGT, based on the solute permeation model and Kolmogorov isotropic turbulence theory, a CFD method combined with the population balance model (PBM) was utilized to simulate gas-liquid mass transfer coefficient. Then, the hydrate formation kinetics model in ISGT was modelled based on the model proposed by Kashchiev and Firoozabadi. The hydrate formation experiments were carried out in the multi-tube bubble column reactor at six different pressure-temperature-circulating flow velocities of piston pump regimes to investigate the actual formation process of natural gas hydrate. The experimental results were then used to finetune the optimized parameters to facilitate accurate model predictions.

A Review of Reactor Designs for Hydrogen Storage in Clathrate Hydrates

“…The adhesion of hydrate to the wall surface will decrease the heat-transfer efficiency and inhibit hydrate formation in the reactor. Therefore, Wang et al [28] proposed a new hydrate-preparation system under an endogenous force-field. In this design, instead of a smooth tube, a tube with an internal spiral groove was used (Figure 5) to generate a secondary flow and centrifugal force (endogenous force field) [29,30].…”

“…As a result of the rapid renewal of the gas-liquid and hydrate-wall interfaces, mass-transfer processes of hydrate-reaction systems were improved. Meanwhile, according to the field-synergy principle [31][32][33], the production of the secondary Therefore, Wang et al [28] proposed a new hydrate-preparation system under an endogenous force-field. In this design, instead of a smooth tube, a tube with an internal spiral groove was used (Figure 5) to generate a secondary flow and centrifugal force (endogenous force field) [29,30].…”

“…On the other hand, an enhanced degree of heat-transfer of the fluid inside the tube was observed due to the production of secondary flow phenomena that also serves to increase the extent of synergism between the velocity and temperature fields [31][32][33]. Therefore, Wang et al [28] proposed a new hydrate-preparation system under an endogenous force-field. In this design, instead of a smooth tube, a tube with an internal spiral groove was used (Figure 5) to generate a secondary flow and centrifugal force (endogenous force field) [29,30].…”

Hydrogen Storage in Propane-Hydrate: Theoretical and Experimental Study

“…There are two main categories in the design of the reactors used for hydrate formation, (I) water dispersion in which water dispersed in a cold high-pressure gas chamber [32][33][34] and (II) gas dispersion reactors where high-pressure gas introduces to a cold body of water. In this family gas/water mixture can be enhanced by bubbling [35][36][37] or different stirring techniques [38][39][40]. The designs with water dispersion found to be more suitable for hydrogen storage due to the formation of the small pieces of hydrates which will provide sufficient free surfaces for hydrogen uptake or release.…”

Prediction of Flow Characteristics in the Bubble Column Reactor by the Artificial Pheromone-Based Communication of Biological Ants

“…The high heat transfer coefficients are characteristics of the bubble columns (Buwa & Ranade, 2003;Kantarci et al, 2005;Krishna & Van Baten, 2003;Leonard, Ferrasse, Boutin, Lefevre, & Viand, 2015;Luo, Lee, Lau, Yang, & Fan, 1999). As the advantage of the bubble columns, it can be stated that a catalyst or other packing chemical components are able to stay a long period even though they are extensively used (Asil, Pour, & Mirzaei 2018;Kannan, Naren, Buwa, & Dutta, 2019;Liu & Luo, 2019;Shi, Yang, Li, Zong, & Yang, 2019;Xin, Zhang, He, & Wang 2019). Also, it is possible to add or remove the online catalyst easily (Deen, Solberg, & Hjertager, 2000;Díaz et al, 2008;Masood & Delgado, 2014;Shimizu, Takada, Minekawa, & Kawase, 2000;Thorat & Joshi, 2004).…”