Gas hydrate preparation method using phase-change heat transfer of oil wrapped water emulsion

A water-in-oil emulsion and gas hydrate technology, which is applied in the direction of gas fuel, lighting and heating equipment, liquefaction, etc., can solve the problems of unadjustable temperature, uneven temperature, agglomeration of ice and hydrate particles, etc., and achieve the improvement of hydrate Generation rate and relative gas storage capacity, increased hydration rate, effect of increased hydration rate

Inactive Publication Date: 2016-06-01
TIANJIN UNIV
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the use of indirect heat exchange faces the following problems: First, indirect heat exchange is local heat exchange, the temperature near the heat exchanger is low, and the temperature far away from the heat exchanger is high. Secondly, the low temperature heat transfer medium will cause the water on the hydrate side of the heat exchanger to freeze, thus directly affecting the heat transfer effect; finally, the uneven temperature and the freezing of the heat exchanger surface will increase the hydration rate and Hydrator becomes an insurmountable obstacle when enlarging the design
The Guangzhou Institute of Energy Research of the Chinese Academy of Sciences and South China University of Technology jointly carried out the research on direct heat transfer (Natural Gas Chemical Industry: C1 Chemistry and Chemical Industry, 2010, (4): 30-34), which uses ice as the heat transfer medium, but due to the entire hydration The system exists in ice / water / hydrate phase, the temperature cannot be adjusted, and the intergranular interaction of ice particles can easily cause ice and hydrate particles to agglomerate, thereby blocking the pipeline and making continuous operation difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Select the oil phase n-hexane and n-heptane, deionized water, surfactant span80 and tween80 to make a mixed solution containing 74.0wt% oil phase, 25wt% water, and 1.0wt% surfactant, wherein the mass ratio of n-hexane and n-heptane is 11:9, and the mass ratio of span80 and tween80 is 0.783:1. The mixture was then kept at 30°C for 30 minutes. Then use a high-speed shearing machine to break the water phase into water droplets of 0.5 μm to 20 μm and disperse them in the oil phase to form an emulsion with good stability. The cooling method is used to cool down the emulsion, and after the water in the emulsion is partially or completely solidified into ice, the temperature is kept constant. The ice-containing slurry thus formed is fully contacted with methane gas and hydrated at 6.0 MPa. The hydration temperature is close to the freezing point of the water phase and maintained at -3°C-0°C. The consumption rate of methane gas is 0.012g / min / mLH 2 O.

Embodiment 2

[0030]Select the oil phase n-heptane, deionized water, surfactant span80 and tween80 to make a mixed liquid containing 62.5wt% oil phase, 35wt% water, and 2.5wt% surfactant, wherein the mass ratio of span80 and tween80 is 0.783:1 . The mixture was then kept at 30°C for 30 minutes. Then use a high-speed shearing machine or similar dispersing equipment to break the water phase into 20-50 μm water droplets and disperse them in the oil phase to form a stable emulsion. The cooling method is used to cool down the emulsion, and after the water in the emulsion is partially or completely solidified into ice, the temperature is kept constant. The ice-containing slurry thus formed was fully contacted with ethane gas and hydrated at 2.0 MPa. The hydration temperature is close to the freezing point of the water phase and maintained at -3°C-0°C. The consumption rate of ethane gas is 0.019g / min / mLH 2 O.

Embodiment 3

[0032] Select the oil phase dispersant n-hexane, deionized water, surfactant span80 and tween80 to make a mixture of oil phase 49.6wt%, water 45wt%, surfactant 5.4wt%, the mass ratio of span80 and tween80 is 0.783:1 . The mixture was then kept at 30°C for 30 minutes. Then use a high-speed shearing machine or similar dispersing equipment to break the water phase into 50-100 μm water droplets and disperse them in the oil phase to form an emulsion with good stability. The cooling method is used to cool down the emulsion, and after the water in the emulsion is partially or completely solidified into ice, the temperature is kept constant. The ice-containing slurry thus formed was fully contacted with carbon dioxide gas and hydrated at 3.0 MPa. The hydration temperature is close to the freezing point of the water phase and maintained at -3°C-0°C. The consumption rate of carbon dioxide gas is 0.015g / min / mLH 2 O.

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Abstract

The invention relates to a gas hydrate preparation method using phase-change heat transfer of oil wrapped water emulsion. The oil wrapped water emulsion is prepared from the following components in percentage by mass: 49.6 percent to 74.0 percent of an oil phase, 25.0 percent to 45.0 percent of water and 1 percent to 5.4 percent of a non-ionic surfactant. The gas hydrate preparation method comprises the following steps: preparing ingredients according to the raw materials; breaking the water phase into water drops with the size of 0.5 micron to 100 microns and dispersing into the oil phase through a high-speed shearing machine or dispersion equipment, so as to form emulsion, wherein a freezing point of the oil phase in the emulsion is lower than a freezing point temperature of the water; cooling the emulsion by adopting a cooling manner and keeping the temperature constant after the water in the emulsion is partially or wholly frozen into ice; enabling formed ice-containing slurry to be in sufficient contact with micro-molecular gas to perform hydration. According to the gas hydrate preparation method provided by the invention, hydration heat can be effectively removed in time by using fusion of the ice in a hydration process; under the condition that a cooling medium is not additionally introduced, the uniformity and stability of a hydration temperature can be kept, so that the generation speed of a hydrate is improved.

Description

technical field [0001] The invention belongs to the field of energy and chemical industry, and is mainly aimed at the storage, separation and exploitation of small molecular gases such as natural gas. Especially the preparation method of gas hydrate by phase transformation heat of water-in-oil emulsion. Background technique [0002] Gas hydrate is a solid substance with a cage structure formed by certain small molecule gases, such as methane, ethane, carbon dioxide, etc., under low temperature and pressure conditions, with water molecules in a non-stoichiometric relationship. Hydrate research originates from solving the problem of flocculent solids clogging natural gas transmission pipelines. Early studies were limited to inhibiting the formation of natural gas hydrates, ignoring the application of hydrates in natural gas storage, carbon dioxide capture and storage, and mixed gas separation. At present, more and more researchers and industrialists pay more and more attenti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10F25J1/00
CPCC10L3/108F25J1/00F25J1/0022
Inventor 辛峰陈彬宋小飞李鑫钢
Owner TIANJIN UNIV
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