Method and device for preparing gas hydrate by direct phase conversion heat

A technology of phase conversion heat and hydration, applied in the direction of mixing methods, chemical methods for reacting liquid and gas media, heat exchange materials, etc., can solve problems such as uneven temperature and affecting heat exchange effects, and achieve continuous Operation, easy constant temperature operation, effect of suppressing temperature rise

Inactive Publication Date: 2014-10-15
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] First of all, 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. Due to the inhomogeneity of the internal temperature, the hydration rate will be affected; secondly, the low-temperature heat exchange medium will make The water on the surface of the heat exchanger freezes, which directly affects the heat transfer effect; finally, the uneven temperature and the freezing of the surface of the heat exchanger will become an insurmountable obstacle when the hydrator is scaled up.

Method used

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  • Method and device for preparing gas hydrate by direct phase conversion heat
  • Method and device for preparing gas hydrate by direct phase conversion heat

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Experimental program
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Effect test

Embodiment 1

[0036] devices such as figure 1 As shown: the disperser 7 is used for high-speed shearing of the mixed liquid containing phase change materials, surfactants, nucleating agents and water. Fix the disperser 7 above the container 5 with a bracket, adjust the height of the disperser 7 so that the knife head of the disperser 7 extends into the liquid in the container 5, and the liquid in the container 5 passes through under the action of the booster pump 3 The suction line 10 and the discharge line 11 are sent to the heat exchanger 2, and the heat exchanger 2 is connected to the hydrator 1 through the liquid inlet line 12. There is an air inlet at the bottom of the hydrator 1, and the hydration gas passes through the air inlet line. 13 enters the hydrator 1, and there is a stirrer 4 in the hydrator 1, mainly to strengthen the mass transfer between the gas and the liquid and to enhance the phase change heat transfer in the hydration process, and to avoid the agglomeration of the for...

Embodiment 2

[0040] Select phase change material n-tetradecane, deionized water, surfactant span60 and tween60 and nucleating agent n-octadecane to make phase change material containing 35wt%, water 62.2wt%, surfactant 2wt%, The mixed solution of 0.8wt% nucleating agent, in which the mass ratio of span60 and tween60 is 1:2, the liquid mixing process is completed in container 5. Then place the container 5 containing the mixed solution in a constant temperature water bath at 30°C and let it stand for half an hour. After the temperature stabilizes, use the disperser 7 at a speed of 10,000 rpm to process it for one hour to obtain an emulsion of the phase change material and water. The emulsion is sent by the booster pump 3 to the heat exchanger 2 through the suction line 10 and the discharge line 11 at a flow rate of 4 mL / min. After cooling, the phase change material droplets in the emulsion are solidified, thereby forming small solid particles dispersed in water. slurry. The slurry enters th...

Embodiment 3

[0042] Select phase change materials n-tetradecane and n-pentadecane, deionized water, surfactant span60 and tween60 and nucleating agent n-octadecane to make phase change material containing 60wt%, water 35wt%, surface Active agent 4wt%, nucleating agent 1wt% mixed solution, wherein the mass ratio of n-tetradecane and n-pentadecane is 4:1, the mass ratio of span60 and tween60 is 1:2, this liquid mixing process Finished in container 5. Then put the container 5 containing the mixed liquid in a constant temperature water bath at 30°C and let it stand for half an hour. After the temperature stabilized, process it with the disperser 7 at a speed of 30,000 rpm for 20 minutes to obtain an emulsion of the phase change material and water. The emulsion is sent to the heat exchanger 2 through the suction line 10 and the discharge line 11 by the booster pump 3 at a flow rate of 2.5mL / min. After cooling, the phase change material droplets in the emulsion are solidified to form small solid...

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Abstract

The invention relates to a direct phase change heat transfer type hydration method and a direct phase change heat transfer type hydration apparatus. Firstly, an emulsion of liquid phase change material and water is prepared, wherein a freezing point of the emulsion higher than that of water, the emulsion is cooled to obtain slurry containing solid particles of the phase change material; and then, the prepared slurry is sent to a hydrator and fully contacts with introduced small-molecule gases to finish the hydration. Heat produced during the hydration process is removed in a direct phase change heat transfer way by utilizing the characteristic that a solid absorbs heat when being melt and matching melt heat with hydration heat. The method is suitable for separation and storage of the gases. The apparatus comprises a disperser (7), a container (5), a pressure pump (3), a heat exchanger (2), a hydrator (1) and a regulating valve (6). A temperature variation of the hydrator designed by the invention is maintained within 1 DEG C. A temperature rise in the hydrator is restrained, so that the hydration rate is significantly increased.

Description

technical field [0001] The invention belongs to the field of energy and chemical industry, especially for the storage and separation of small molecular gases such as natural gas, and proposes a direct phase-change thermal hydration method and device. Background technique [0002] Some small molecular gases, such as methane, ethane, carbon dioxide, etc., will form a cage-like solid substance with water in a non-stoichiometric ratio under low temperature and high pressure conditions, called gas hydrates. The research on hydrates originates from the discovery of a large amount of cotton wool-like solids in natural gas transportation pipelines, which can block pipelines in severe cases. At first people's motivation was to try to prevent the formation of this natural gas hydrate, but now more people want to use hydrates to store natural gas, capture carbon dioxide in the air, and separate mixed gases. However, all these applications are limited by the too low hydration rate, whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J10/00B01F3/04B01F13/10C09K5/00
Inventor 辛峰宋小飞李鑫钢
Owner TIANJIN UNIV
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