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Gas hydrate generation/decomposition system and method for in-situ Raman analysis

A gas hydrate and in-situ Raman technology, applied in the field of hydrate experiments, can solve problems such as difficult sampling, inability to analyze hydrates, difficulty in sample transfer, etc., and achieve the effect of eliminating experimental errors

Active Publication Date: 2019-11-22
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, laboratories are limited by experimental conditions to conduct ex-situ Raman characterization of hydrate growth. For example, the patent No. CN101477086B proposes a gas hydrate generation sampling analysis method and device, which has difficulties in sampling and sample transfer. Disadvantages such as protection
However, a few devices suitable for in-situ Raman characterization of hydrates, such as CN103278374B patent, propose an in-situ Raman analysis and hydrate characterization device and an in-situ Raman analysis method for hydrate samples. 5 12 Caged peak coverage, resulting in inability to analyze hydrate 5 12 Cage Disadvantages

Method used

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  • Gas hydrate generation/decomposition system and method for in-situ Raman analysis

Examples

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Embodiment 1

[0025] This embodiment is a gas hydrate generation / decomposition system for in-situ Raman analysis, taking the methane hydrate generation / decomposition experiment as an example, combining figure 1 , the process of generating the experiment is as follows:

[0026] The gas cylinder 7 is filled with high-purity methane gas with a purity of 99.99%, and the plunger pump 6 is filled with scientific-grade deuterated methane gas with a purity of 99.98%;

[0027] Add deionized water into the reactor 3, and use the temperature sensor and liquid nitrogen temperature control parts to lower the temperature of the reactor 3 below 0°C to freeze the deionized water to prevent water from being drawn out of the reactor 3 due to vacuum; Open the vacuum pump 3 and the valve after freezing, and close the vacuum pump 3 and the valve after the reactor 3 is evacuated;

[0028] Close the needle valve at the connection between the pre-cooling device 4 and the reactor 3, unscrew the knob of the methane...

Embodiment 2

[0038] Taking the ethane hydrate formation / decomposition experiment as an example, combined with figure 1 , the process of generating the experiment is as follows:

[0039] The gas cylinder 7 is filled with 95% high-purity methane gas, 5% ethane, propane mixed gas in any ratio, and the plunger pump 6 is filled with all deuterated 95% high-purity methane gas and 5% ethane propane gas;

[0040] The steps are exactly the same as those in Example 1.

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Abstract

The invention provides a gas hydrate generation / decomposition system and a gas hydrate generation / decomposition method for in-situ Raman analysis, which can realize kinetic experiments such as generation / decomposition of a gas hydrate, and perform in-situ Raman characterization. The gas hydrate generation / decomposition system comprises a Raman spectrometer, and a reaction kettle system, a temperature control system, a sample pre-cooling system, a pressure-controlled gas supply system, a vacuum system, a rapid exhaust system and a data acquisition and processing system which are connected by means of connecting pipelines. The gas hydrate generation / decomposition system can ensure that the hydrate is subjected to in-situ Raman characterization in a reaction kettle, and solves the problems ofexperimental errors and the like caused by sampling difficulty / sample transfer in non-in-situ Raman characterization.

Description

technical field [0001] The invention belongs to the field of hydrate experiments, and relates to a gas hydrate generation / decomposition system and method for in-situ Raman characterization. In particular, it relates to a method suitable for in-situ high-pressure gas hydrate formation / decomposition kinetics experimental research. Background technique [0002] Gas hydrate is under high pressure and low temperature conditions, the main molecular water is connected by hydrogen bonds to form a series of holes of different sizes, and the guest molecules of appropriate size are filled in the holes through van der Waals force, forming non-stoichiometric cages with different filling rates crystals. According to the different structure of the hydrate unit cell, the hydrate has three structures: type I, type II and type H respectively. The type I hydrate unit cell is a body-centered cubic structure, containing 46 water molecules, composed of 2 5 12 (SC) holes and 6 5 12 6 2 (LC) H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65G01N21/01
CPCG01N21/01G01N21/65
Inventor 宋永臣赵佳飞李曼刘卫国杨明军李洋辉凌铮刘瑜张毅王大勇
Owner DALIAN UNIV OF TECH
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