Experimental method for capturing full-period forms of gas hydrate crystals

Abstract

The invention belongs to the technical field of gas hydrate generation experiments, and provides an experimental method for capturing full-period forms of gas hydrate crystals. A system adopted by theexperimental method comprises a jacket type visual reaction kettle, image acquisition equipment, a backlight source, a heating and refrigerating circulator, a gas injection pump, a liquid injection pump, a data acquisition system and a computer. According to the experimental method, the memory effect of hydrate secondary generation is utilized, the induction time is shortened, and hydrate crystalform capture under different working conditions below a phase equilibrium point is achieved. The experimental method is not limited by the problem that hydrates are difficult to generate or not generated under the working condition of a near-phase equilibrium point and the problem that the timely induction time is long, so that crystal form capture under more working condition ranges is obtained,the crystallization process of the hydrates is convenient to control, and a morphological basis is provided for hydrate research.

Description

technical field [0001] The invention relates to the technical field of gas hydrate formation experiments, and more specifically, to a visual experimental method for capturing the full-cycle morphology of gas hydrate crystals based on a visual reactor. Background technique [0002] Gas hydrate is an ice-like crystalline compound. The main body is water molecules forming cages of different shapes through hydrogen bonds, and gas molecules of different sizes and shapes (such as hydrogen, methane, carbon dioxide) live in the cages as guest molecules. Gas hydrate has the characteristics of high gas storage capacity, convenient storage and transportation, economical safety, etc., so it has important application prospects in industrial practice. have been extensively studied in other fields. [0003] At present, the research on gas hydrate mainly focuses on the kinetics and thermodynamics in the process of formation and decomposition, and the research on the morphology of gas hydra...

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Problems solved by technology

[0004] A large number of scholars have observed the hydrate formation process under macroscopic conditions, but there are limitations: first, macroscopic observations cannot capture the shape and size of hydrate crystals; second, the formation of gas hydrates requires relatively harsh low temperature and high pressure conditions And it needs a longer induction time, the closer to the hydrate phase equilibrium point, the more difficult or even impossible to capture the growth of hydrate crystals

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