Experimental device and method for observing generation of hydrates promoted by microbubbles through nuclear magnetism

Abstract

The invention discloses an experimental device and method for observing generation of hydrates promoted by microbubbles through nuclear magnetism, and belongs to the field of hydrate application. The device adopts a high-pressure reaction kettle provided with a sintering perforated plate, and a gas injection system, a liquid injection system and a temperature control system which match each other. The method comprises the following steps: putting the high-pressure reaction kettle into a nuclear magnetic instrument, controlling the temperature of the reaction kettle to be constant, injecting gas into the reaction kettle through the perforated plate at different flow rates, controlling the reaction kettle to be in a constant-pressure state through a gas collecting pump, generating microbubbles in situ in the high-pressure reaction kettle by using the perforated plate, and the process of promoting hydrate generation by the microbubbles is observed by nuclear magnetism. The mass transfer phenomenon in the solution in the microbubble injection process can be observed by processing a nuclear magnetic image, and the influence of the microbubbles on hydrate nucleation under the condition can be analyzed. Generation of hydrates is promoted by adopting a mode of generating the microbubbles through the perforated plate, and the influence of addition of an accelerant on the environment is avoided while the hydrates are rapidly generated.

Description

technical field

[0001] The invention belongs to the field of hydrate application, and relates to an experimental device and method for promoting the formation of hydrate by using nuclear magnetic observation of microbubbles. Background technique

[0002] Magnetic resonance imaging (MRI) technology has the advantages of fast, accurate, non-destructive and intuitive observation and display of test samples, and has achieved good application results in the fields of medicine, materials and petrochemistry. In the field of hydrate research, NMR / MRI technology has also attracted more and more researchers' attention because of its strong potential and functions in detecting the internal structure of hydrates / hydrates. Therefore, the SEMS pulse sequence in the high-field MRI system can be used to obtain the two-dimensional MR proton density images of the experimental samples in real time, so as to realize the dynamic monitoring of the in situ generation of microbubbles and hydrate pr...

Examples

Embodiment Construction

[0028] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.

[0029] figure 1 and figure 2 Shown is an experimental device for NMR observation of microbubbles to promote the formation of hydrates, which includes a gas cylinder 1 , a solution bottle 4 , a vacuum pump 5 , a data acquisition system 9 and a high-pressure reactor 8 . The high-pressure reaction kettle 8 is placed in the nuclear magnetic signal detection area of ​​the high-field nuclear magnetic instrument 7, and an inner pipe 8e and an outer pipe 8d are arranged between the inlet head 8a and the outlet head 8b of the high-pressure reaction kettle 8, which are fixed on the inlet head 8a The upper end surface of the air intake micro-pipe 8c on the top is in contact with the perforated plate 8h arranged in the inner pipe 8e; a cooling liquid chamber 8i is formed between the inner pipe 8e and the outer pipe 8d, and th...

technical field

[0001] The invention belongs to the field of hydrate application, and relates to an experimental device and method for promoting the formation of hydrate by using nuclear magnetic observation of microbubbles. Background technique

[0002] Magnetic resonance imaging (MRI) technology has the advantages of fast, accurate, non-destructive and intuitive observation and display of test samples, and has achieved good application results in the fields of medicine, materials and petrochemistry. In the field of hydrate research, NMR / MRI technology has also attracted more and more researchers' attention because of its strong potential and functions in detecting the internal structure of hydrates / hydrates. Therefore, the SEMS pulse sequence in the high-field MRI system can be used to obtain the two-dimensional MR proton density images of the experimental samples in real time, so as to realize the dynamic monitoring of the in situ generation of microbubbles and hydrate pr...

Examples

Embodiment Construction

[0028] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.

[0029] figure 1 and figure 2 Shown is an experimental device for NMR observation of microbubbles to promote the formation of hydrates, which includes a gas cylinder 1 , a solution bottle 4 , a vacuum pump 5 , a data acquisition system 9 and a high-pressure reactor 8 . The high-pressure reaction kettle 8 is placed in the nuclear magnetic signal detection area of ​​the high-field nuclear magnetic instrument 7, and an inner pipe 8e and an outer pipe 8d are arranged between the inlet head 8a and the outlet head 8b of the high-pressure reaction kettle 8, which are fixed on the inlet head 8a The upper end surface of the air intake micro-pipe 8c on the top is in contact with the perforated plate 8h arranged in the inner pipe 8e; a cooling liquid chamber 8i is formed between the inner pipe 8e and the outer pipe 8d, and th...

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