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Method and device for in-site measuring gas hydrate and deposit sediment heat stability containing hydrate

A gas hydrate and hydrate-containing technology, which is applied in the direction of measuring devices, material thermal development, material thermal analysis, etc., can solve the quality problem of hydrate formation, can not give the thermal conductivity change with temperature, and is not suitable for measuring the thermal conductivity of hydrate Coefficient and other issues, to achieve the effect of wide temperature and pressure range, compact test structure

Inactive Publication Date: 2007-04-11
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Axial pressurization is usually used (this is an effective way to get rid of residual gas), but pressurization will change the volume of hydrates, and the probe is placed axially, so the placement of the probe becomes the primary problem
At present, the thermal conductivity of hydrates measured by the probe method in the world is very different, and it cannot give a very reliable relationship between the thermal conductivity and the temperature change.
On the one hand, this is because the probe method is not suitable for measuring the thermal conductivity of hydrates, and on the other hand, there are problems with the quality of hydrate formation.

Method used

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  • Method and device for in-site measuring gas hydrate and deposit sediment heat stability containing hydrate
  • Method and device for in-site measuring gas hydrate and deposit sediment heat stability containing hydrate

Examples

Experimental program
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Embodiment 1

[0036] In Figures 1 and 2, methane gas and 280 ppm sodium dodecylsulfonate (SDS) aqueous solution are used as reactants to react and synthesize methane hydrate. Before the experiment, adjust the temperature control system earlier, the temperature of the reaction is set as 0 ℃, then clean the reactor 11 with the SDS aqueous solution of 280ppm that has been prepared, then inject 100 grams of sodium dodecylsulfonate (SDS) aqueous solution, and then The reactor lid 11-5 is put on and sealed. Then open the valves F1, F2, F3, F4 and F5, open and close the valve F1 continuously and quickly, let the methane gas in the gas cylinder 9 continuously flush the pipeline to discharge a part of the air, then close the valves F1 and F5, turn on the vacuum pump 8 to start pumping vacuum. After the vacuum gauge is stable, close the valve F4, open the valve F5 to reset the vacuum pump 8. Close the valve F2, open the valve F1 to start air intake, and wait for the system pressure to balance, clos...

Embodiment 2

[0039] The effective thermal conductivity of porous media containing tetrahydrofuran sand is measured by mixing sand and tetrahydrofuran solution. This example is to simulate the effective thermal conductivity measurement of actual sampling samples. As mentioned above, the temperature control system was set to 0°C before the experiment, and then 21% tetrahydrofuran aqueous solution was injected into the reactor, and the construction sand of 300-125 μm that passed the screening was slowly introduced into the solution with a glass rod until the sand layer completely submerges the Hotdisk probe. Use a straw to suck out the excess tetrahydrofuran aqueous solution above the sand layer, place the entire reactor in a temperature control system, and start the reaction. After about 5-10 hours, the liquid phase is completely transformed into tetrahydrofuran hydrate, and it is aged under the current temperature and pressure conditions by keeping it warm for 2-3 days. Subsequently, in-si...

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Abstract

The invention provides a method and the setting used for insite measuring the thermonature of the gaseous hydrate and the sediments which containing hydrate. The said measuring system includes a gas inlet and outlett systems; a temperature control system, a high presser viarable capacitied reactor; a hydraulic transmission system; a observing and control gathering system. The said method includes the following steps the reacting gas entering the high pressure viarable capacital reactor which immersed in the temperature control system through gas inlet and outlet system,and reacting with the other reactants in the high pressure variable capcity reactor to produce gaseous hydrate or hydrate sediments on constant temperature and pressure condition controlled by the temperature control system and hydraulic driving system seperatively;last,measuring the thermophysical property of the produced gaseous hydrate or hydrate sediments by the observing and control gathering system. The design of the invention can meet the synthesis of different types and quantity of hydrate and realizes the insite measurement of the thermophysical property of the hydrate.

Description

technical field [0001] The invention relates to a method and a device for measuring thermal properties of gas hydrate and hydrate-containing deposits. Background technique [0002] Gas hydrate is an enveloping crystal formed by the interaction of gas or volatile liquid with water. Gas hydrate, also known as clathrate hydrate, has a unique molecular structure: water molecules form molecular cages by van der Waals force, and guest molecules are wrapped in water molecule cages for relatively free rotation. At present, the most studied and deepest hydrates are natural gas hydrates and refrigerant hydrates. The former has received extensive attention as a huge potential energy source and a way to store energy; the latter has a relatively high phase transition temperature (5- 12°C) and a latent heat of phase change comparable to that of ice, it is considered to be one of the more excellent cold storage media. [0003] Although the phase transition temperature of refrigerant hydr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/00G01N25/20
Inventor 樊栓狮黄犊子梁德青
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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