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Gas hydrate generating, sampling and analyzing method and apparatus

A technology for generating gas hydrates and hydrates, which can be used in sampling devices, measuring devices, analysis materials, etc., and can solve the problems of difficulty in sampling and analysis, sampling and analysis of gas components

Active Publication Date: 2009-07-08
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the sampling volume must be small to ensure that other phase states do not change during sampling, it is difficult to sample and analyze gas components in hydrate experiments
At the same time, in order to analyze the content of gas components in the liquid or hydrate phase, sampling analysis is also difficult

Method used

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  • Gas hydrate generating, sampling and analyzing method and apparatus
  • Gas hydrate generating, sampling and analyzing method and apparatus
  • Gas hydrate generating, sampling and analyzing method and apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Mixed gas hydrate phase equilibrium point sampling analysis experiment

[0071] This experiment adopts observation method and temperature search method, and the main experimental steps are as follows:

[0072] 1) During the pure water experiment, the advection pump 8 extracts the deionized water in the container 7 and injects it into the reactor 1, and during the chemical reagent solution experiment, the advection pump 8 extracts the deionized water in the container 7 and injects it into the bottom of the intermediate container 9, and pushes the piston in the intermediate container 9 upward. The chemical reagent solution on the upper part of the piston is injected into the reactor 1;

[0073] 2) Adjust the temperature of the external constant temperature water bath 19 to the experimental temperature, open the internal circulation system of the external constant temperature water bath 19 so that the constant temperature water circulates in the constant temperature water ...

Embodiment 2

[0079] Sampling analysis experiment of mixed gas hydrate formation

[0080] This experiment is mainly about the change of mixed gas components during the formation of multi-component mixed gas hydrates. The main experimental steps are as follows:

[0081] (1) Inject the reaction liquid into the reaction kettle 1, vacuumize, control the temperature of the water bath to reach the experimental set temperature, inject multi-component mixed gas, and make the pressure in the reaction kettle 1 higher than the equilibrium pressure of the mixed gas hydrate formation phase at this temperature , the mixed gas reacts with the liquid in the reactor 1 to generate a large amount of mixed gas hydrate;

[0082] (2) During the formation process of mixed gas hydrate, during the gas dissolution process, a small amount of gas phase and liquid phase samples were respectively drawn to the gas chromatograph 17 to analyze the components when the pressure was fast at the beginning. When it continues t...

Embodiment 3

[0085] Hydrate Gas Separation Experiment

[0086] (1) Inject reaction liquid in reactor 1, can measure and calculate and obtain injection liquid volume V by electronic balance 6 l , given the volume V of the reactor 1, the gas phase volume V can be obtained gas = V - V l , the reaction kettle 1 is evacuated, and the temperature of the water bath is controlled to reach the experimental set temperature T;

[0087] (2) Configure component x according to experimental requirements A，0 The separation gas (A, B), this gas is first extracted by the gas-tight syringe 16 and injected into the gas chromatograph 17 to analyze whether the component is x A，0 , and then inject the gas into the reactor 1, so that the pressure in the reactor 1 is higher than the equilibrium pressure P of the separated gas hydrate formation phase at this temperature 0 , can be calculated by the formula PV=ZnRT(1) to get the injected separation gas n 0 mol, the separated gas reacts with the liquid in the r...

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Abstract

The invention discloses a device and a method for generating, sampling and analyzing gas hydrates. The device comprises a gas supply module, a liquid supply module, a gas hydrate generation module, a sampling module, a temperature control module, a data acquiring and processing module and a gas chromatograph. The method comprises the steps of acquiring gas components in a gas phase, a liquid phase and a hydrate phase in a phase equilibrium point of a multicomponent mixed gas hydrate, the generation process of the multicomponent mixed gas hydrate and hydrate-method separation gas respectively through the device, analyzing the components in gas chromatography and obtaining the component-distribution situation of multicomponent mixed gas in each phase, as well as the recovery rate and separation factor of the hydrate-method separation gas. The invention solves the study on the determination of each component of mixed gas in each phase state in the generation experiment of the multicomponent mixed gas hydrate, can accurately sample, does not affect other conditions or change the component distribution of the other phase states, ensures true accurate analysis results, and applies to the study on the generation of the multicomponent mixed gas hydrate and gas separation-purification experiment. The method and the device have the advantages of simplicity, convenient operation and low cost.

Description

technical field [0001] The invention relates to a method and device for gas hydrate formation, sampling and analysis, in particular to an analysis method and device for component determination in multi-component mixed gas hydrate formation. Background technique [0002] Gas hydrate, also known as clathrate hydrate, consists of many low-molecular-weight gas molecules, such as hydrocarbons, carbon dioxide, etc., surrounded by water molecules, and forms an ice-like crystal structure near the high-pressure freezing point. The hydrates discovered so far are mainly divided into three structures: SI hydrate with a body-centered cubic structure, SII hydrate with a face-centered cubic structure, and SH hydrate with a hexagonal structure. [0003] The type of hydrate formed by gas molecules is related to the van der Waals radius of the molecule. The molecular size that the hydrate can accommodate is: SI is less than 0.52nm, SII is 0.52-0.69nm, and SH is 0.75-0.9nm. With the continuou...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N1/02
Inventor 李小森颜克凤陈朝阳李刚杨海建
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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