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

A technology of gas hydrate and experimental method, which is applied in the visual experiment field of gas hydrate crystal full-cycle capture, which can solve the problems of long induction time under low temperature and high pressure conditions, difficult capture, and failure to capture hydrate crystal growth, etc., to achieve shortened The effect of induction time and simple experimental operation

Active Publication Date: 2020-04-21
DALIAN UNIV OF TECH
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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

Method used

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

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Embodiment Construction

[0022] Specific embodiments of the present invention will be described in detail below in conjunction with specific technical solutions and accompanying drawings.

[0023] An example is at 3MPa, 16°C, carbon dioxide + thermodynamic additive 3mol% tetrahydrofuran solution, to complete the trapping of gas hydrate crystals. Through literature research, it is found that under this concentration of additives, the corresponding phase equilibrium temperature of carbon dioxide at 3MPa is 17°C. The specific implementation includes the following steps:

[0024] (1) Assemble and connect the experimental system, and complete the pipeline leak detection.

[0025] (2) Configure 3.0mol% tetrahydrofuran solution, open the liquid inlet valve, inject 3.5 ml of 3.0mol% tetrahydrofuran solution from the liquid inlet port on the upper end of the reactor body through the liquid injection pump until the liquid level reaches the center of the reactor, and close the liquid inlet valve ;Fill the gas ...

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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...

Claims

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Application Information

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IPC IPC(8): G01N25/14G01N21/84
CPCG01N21/84G01N25/147
Inventor 宋永臣蒋兰兰徐楠刘瑜杨明军赵佳飞张毅
Owner DALIAN UNIV OF TECH
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