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Low-pressure preservation method of natural gas hydrate

A preservation method and hydrate technology, applied in gas/liquid distribution and storage, gas fuel, fixed-capacity gas storage tanks, etc., can solve the potential mechanism has not been established, low hydrate dissociation rate, hydrate spherical shell deformation, etc. problems, to achieve the effect of convenience and water separation and reuse, mild conditions and simple raw materials

Inactive Publication Date: 2021-08-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although more has been learned about the preservation effects of abnormalities in recent years, the exact underlying mechanisms have not been established
Furthermore, despite the very low rate of hydrate dissociation at temperatures where the self-preservation effect occurs, a small amount of natural gas is always lost during storage
In addition, for large storage and transportation facilities, the formation of ice on the hydrate spherical shell is uncontrollable, which may lead to deformation of the hydrate spherical shell, resulting in increased gas release when the hydrate dissociates

Method used

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  • Low-pressure preservation method of natural gas hydrate

Examples

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Effect test

Embodiment 1

[0038] To preserve natural gas hydrate, it is first necessary to generate natural gas hydrate. The main component of natural gas is methane. In this example, natural gas hydrate is generated by ice powder and methane for low-pressure preservation.

[0039] Before starting, place the entire high-pressure piston reactor in a glass cylinder 11 filled with 50% ethylene glycol aqueous solution. The temperature is controlled at -2°C by a low-temperature thermostat 13. After the entire kettle is cooled to the set temperature, the pre-processed The obtained ice powder 90g is added in the high-pressure piston reactor 10, and the piston 9 in the piston reactor 10 is at the lowest position in the still when the ice powder is added. After starting the vacuum pump 4, open the valve 5 and evacuate the inside of the kettle through the three-way valve 6. After the vacuuming is completed, close the valve 5 and the vacuum pump 4, open the pressure reducing valve 2, and add 9 MPa of methane gas i...

Embodiment 2

[0043] To preserve natural gas hydrate, it is first necessary to generate natural gas hydrate. The main component of natural gas is methane. In this example, 300ppm SDS (sodium dodecyl sulfate) aqueous solution and methane are used to generate natural gas hydrate for low-pressure preservation. Because SDS is a kinetic accelerator that can make hydrates rapidly and high-storage, the SDS additive is selected for hydrate formation.

[0044] Before the start of the experiment, the entire high-pressure piston reactor was placed in a glass cylinder 11 filled with 50% ethylene glycol aqueous solution, and the temperature was controlled at 2°C by a low-temperature thermostat 13. After the entire reactor was cooled to the set temperature, the pre-configured A good 70ml300ppm SDS aqueous solution is added in the high-pressure piston reactor 10, and when the SDS aqueous solution is added, the piston 9 in the piston reactor 10 is at the lowest position in the still. After starting the vac...

Embodiment 3

[0048] To preserve natural gas hydrate, it is first necessary to generate natural gas hydrate. The main component of natural gas is methane, and usually contains a small amount of propane. In this example, natural gas hydrate is generated by ice powder and methane / propane mixture for low-pressure preservation.

[0049]Before the start of the experiment, the entire high-pressure piston reactor was placed in a glass cylinder 11 filled with 50% ethylene glycol aqueous solution, and the temperature was controlled at -2°C by a low-temperature thermostat 13. After the entire kettle was cooled to the set temperature, the pre- The processed ice powder 70g is added in the high-pressure piston reactor 10, and the piston 9 in the piston reactor 10 is at the lowest position in the still when the ice powder is added. After starting the vacuum pump 4, open the first valve 5 to evacuate the kettle through the three-way valve 6. After the vacuum is completed, close the first valve 5 and the va...

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Abstract

The invention discloses a low-pressure preservation method for natural gas hydrates. Low-pressure preservation of natural gas hydrates at the freezing point or above can be achieved. Natural gas storage and transportation is an important premise of natural gas utilization, and hydrate storage and transportation of natural gas is a promising storage and transportation mode. The generated natural gas hydrate is subjected to mechanical extrusion, cyclopentane addition and other treatment, so that cyclopentane acts with the natural gas hydrate on the surface, a stable hydrate shell is formed on the surface to hinder decomposition of the internal natural gas hydrate, and therefore low-pressure storage of the natural gas hydrate is achieved. The method has the advantages that the operation is simple; the preservation conditions are mild, the preservation pressure can be atmospheric pressure, and the preservation temperature can be at the freezing point or above; and the natural gas hydrates are mainly arranged in the hydrates, and the gas storage capacity is high.

Description

technical field [0001] The invention relates to the technical field of natural gas and the technical field of natural gas hydrate storage and transportation, in particular to a low-pressure preservation method of natural gas hydrate. Background technique [0002] Economic development and people's daily life are closely related to energy. China has been the world's largest energy consumption market for several consecutive years. While energy consumption continues to increase, due to the needs of environmental protection and green and low-carbon development, energy consumption is developing in a clean and low-carbon direction. Natural gas is becoming more and more important in the energy consumption structure, and the consumption of natural gas in my country is also increasing year by year. In order to deal with problems such as the mismatch between production and consumption, peak shaving, various emergencies (such as gas pipeline accidents, etc.), and maintaining the stabil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10F17C11/00F17D1/065F17D3/01
CPCC10L3/108F17C11/007F17C2221/033F17D1/065F17D3/01
Inventor 樊栓狮徐健王盛龙郎雪梅王燕鸿于驰李刚
Owner SOUTH CHINA UNIV OF TECH