JPS60222185A - Method and device for supplying cryogenic medium - Google Patents

Abstract

PURPOSE:To simplify the installation as a whole, to reduce operating energy and to utilize effectively the cold heat of a cryogenic medium by ejecting directly said medium into the liquid phase of the liquid to be cooled. CONSTITUTION:A nozzle mounting pipe 13 which has a supporting flange 14 on the outside of a containing vessel 11 for contg. the liquid to be cooled and communicates the inside and outside of the vessel is provided to the vessel bottom 11A positioned in the liquid phase of said vessel. A nozzle 16 which ejects the cryogenic medium into said liquid phase and has a nozzle flange 15 on the root end side is disposed by inserting the nozzle into said pipe from the outside of the vessel. A cryogenic medium introducing pipe 20 having a fixing flange 19 which supports the flange 15 between said flange and the supporting flange 14 is connected to the nozzle 16. The cryogenic medium is directly ejected into the liquid phase of the liquid to be cooled. As a result, the installation is simplified as a whole and the operating energy is reduced. The effective use of the cold heat of the cryogenic medium is thus made possible.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a cryogenic medium supply method and supply device,
In particular, the present invention relates to a method and an apparatus for supplying cryogenic LNG (liquefied natural gas) to seawater for the purpose of seawater desalination.

[Secret 3H (Technology)] LNG is imported at an extremely low temperature (-161.5°C) and used after being vaporized by heat exchange with seawater. During vaporization, the heat of vaporization of LNG creates ice in the seawater. Seawater desalination technology using LNG cold energy is already known, which produces fresh water by crystallizing it, separating it from seawater, washing it, and melting it.

FIG. 1 shows a conventional device for supplying LNG to seawater. In this figure, seawater 2 as a liquid to be cooled is stored in a crystal canister l as a storage canister, and this seawater 2 is fed by an agitator. 3 and circulated by the crystal tank circulation pump 4, LNG is dispersed from the gas phase of the crystal tank 1 to the liquid phase surface of the seawater 2 through the LNG inlet pipe 5, and the LNG is dispersed.
G is drawn into the seawater z being stirred, deprives the seawater 2 of its ripeness and vaporizes, then rises inside the crystal can 1 and flows into the gas heater (not shown) through the gas phase communication pipe 6. can l
The seawater 2 inside is cooled by the LNG and crystallized to form a slurry in which fine ice crystal grains are suspended, and this slurry is transferred to a dissolution layer (not shown) via a slurry outlet pipe 7. .

However, in such conventional methods and devices, L
Since NG is dispersed from the gas phase of the crystal can 1 onto the surface of the seawater 2, a stirrer 3 and a crystal can circulation pump 4 are required, and the overall equipment is large-scale and requires a large amount of operating energy. In addition, since LNG is dispersed into the gas phase, the temperature of the gas phase decreases.
This is disadvantageous from the perspective of vaporizing LNG, and the latent heat of LNG is not effectively utilized sufficiently.
Furthermore, it has the disadvantage that interfacial blowing (ice blocks) is likely to occur, and it has not always been possible to effectively utilize the cold energy of LNG.

Moreover, a similar situation may occur not only when LNG is supplied to seawater, but also when a cryogenic medium other than LNG is supplied to a cooled liquid other than seawater.

[Object of the Invention] An object of the present invention is to provide a method and apparatus for supplying a cryogenic medium, in which the equipment as a whole is simplified, operating energy is reduced, and the cold energy of the cryogenic medium is effectively utilized. It is in.

[Configuration 1 of the Invention] Therefore, the supply method according to the present invention prevents the occurrence of steam explosion (rapid boiling IJIh of the cryogenic medium) due to a large temperature difference even if the cryogenic medium is brought into direct contact with the liquid to be cooled at around room temperature. This is based on the fact that it has been experimentally confirmed that there are no

Eliminates the need for conventional stirrers and circulation pumps by utilizing the flow of the cryogenic medium in the liquid phase and the agitation effect of the bubbles of the cryogenic medium that occur in the liquid phase, and also enables direct injection into the liquid phase. This aims to achieve the above objective by effectively utilizing cold energy.

Further, the supply/supply device according to the present invention has a support flange on the outside of the can for the can liquid maintained in the liquid phase of the liquid to be cooled in a storage can containing the liquid to be cooled, and communicates the inside and outside of the can. A nozzle mounting pipe is provided, into which a cryogenic medium is ejected into the liquid phase, and a nozzle flange is provided on the base end side. A nozzle is inserted and arranged from the outside of the can, and furthermore, a cryogenic medium introduction pipe having a fixed flange for sandwiching the nozzle flange and the support flange is connected to this nozzle. The object is to achieve the above object by making it possible to directly inject a cryogenic medium into the liquid phase of the liquid to be cooled.

[Description of Example 1 Embodiments of the present invention will be described below based on the drawings.

FIG. 2 shows a cryogenic medium supply device according to the present invention.
An embodiment is shown in which the present invention is applied to a crystal can of a seawater desalination device using cold energy. In the figure, a crystal can 11 serving as a storage can accommodates seawater 12 as a liquid to be cooled, and a can bottom 11A of the crystal can 11 is provided with communication between the inside and outside of the can, as shown in an enlarged view in FIG. A nozzle mounting pipe 13 is removed 4-1, and a support flange 14 is provided at the end of the nozzle mounting pipe 13 on the outside of the can. A nozzle 16 having a nozzle flange 15 on the base end side is inserted into the nozzle mounting pipe 13 from the outside of the can, and a gap between the nozzle mounting pipe 13 and the nozzle 16 is provided with a flow path for ejecting the liquid to be cooled. Seawater spout channel 1
7 is formed, and a seawater introduction pipe 18 is communicated with this seawater spouting passage 17, so that the seawater supplied from the seawater introduction pipe 18 to the passage 17 is jetted from near the tip of the nozzle 16. The nozzle 16 also has an LNG introduction pipe 2 as a cryogenic medium introduction pipe, which has a fixed flange 19 that sandwiches the nozzle flange 15 with the support flange 14.
0 is connected, and the support flange 14 and fixed flange 19 are tightened by the port 21 with the nozzle flange 15 in between!
It is fastened to 1.

When LNG, which is a cryogenic medium, is directly injected from the nozzle 16 into the seawater 12, that is, into the liquid phase inside the crystal can ll, LNG
The seawater 12 is cooled by the cold heat of the NG, crystallization occurs, and becomes a slurry, and this slurry is passed through the slurry outlet pipe 22.
The vaporized LNG is guided out of the can through the
is led out of the can via the gas phase communication pipe 23.

According to this embodiment, since LNG is directly injected into the liquid phase of the seawater 12 in the crystal can 11, the LNG
The cold energy of NG, that is, latent heat and sensible heat, will be directly absorbed by the seawater 12, and the cold energy of LNG will be effectively utilized. In addition, the occurrence of sea surface blocks is also prevented. Furthermore, crystal can 1
Since LNG is not supplied to the gas phase part in the gas phase part 1, the temperature of the gas phase part increases compared to the conventional case, which is advantageous in vaporizing the LNG. Furthermore, even if LNG is directly injected into the liquid phase of seawater 12 at around room temperature, no steam explosion phenomenon will occur, so there is no safety risk.

Furthermore, sufficient stirring action is obtained by the flow of LNG in the seawater 12 and the kinetic energy of the LNG bubbles generated in the seawater 12, so the agitator and circulation pump that were conventionally required are no longer necessary, simplifying the equipment. This has the effect of reducing operating energy.

Furthermore, since the nozzle 16 can be easily replaced from outside the crystal can 11, it is extremely convenient to replace the nozzle 16 when it is worn out, perform maintenance and inspection, etc.

Furthermore, since the seawater spout channel 17 is provided near the nozzle 16, the seawater disturbs the flow at the tip of the nozzle 16, which has the effect of preventing the tip of the nozzle 16 from freezing. .

Next, embodiments other than those described above will be described.

4 and 5 show an embodiment other than the above. In this embodiment, a seawater spout passage 17 is not provided around the nozzle 16, and in this embodiment, the nozzle mounting pipe 13 is The structure is similar to that of the embodiment shown in FIGS. 2 and 3 above, except that tetrafluoroethylene resin (trade name: Teflon) is used.

In addition to producing substantially the same functions and effects as in the previous embodiment, this embodiment has excellent heat insulation properties because the nozzle mounting pipe 13 is made of the above-mentioned material, and prevents freezing of the nozzle mounting pipe 13 and its vicinity. The effect is large, and the anti-freezing effect is also large due to the large interfacial tension.

In each of the above embodiments, the present invention is applied to seawater desalination technology using LNG cold energy. However, the present invention is not limited to the above-mentioned cases, and can be applied to LNG vaporization equipment. It may be possible to reduce the size of the LN.
It can also be applied when a cryogenic medium other than G is supplied to a liquid to be cooled other than seawater. In addition, the above nozzle 1
6- is not limited to the can bottom 11A, but may be attached to any can wall located in the liquid phase.

[Effects of the Invention] As described above, the present invention provides a cryogenic medium supply method and a supply device that simplify the equipment as a whole, reduce operating energy, and effectively utilize the cold energy of the cryogenic medium. can be provided.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the configuration of a conventional LNG supply device, and FIGS. 2 and 3 show an example in which the cryogenic medium supply device according to the present invention is applied to a crystal canister for seawater desalination using LNG cold energy. FIGS. 4 and 5 are a front view and an enlarged sectional view showing the overall structure and main parts of an embodiment other than the above. FIGS. DESCRIPTION OF SYMBOLS 11... Crystal can as a storage can, 12... Seawater as a liquid to be cooled, 13... Nozzle attachment pipe, 14... Support flange, 15... Nozzle flange, 16... Nozzle, 17... Seawater spout flow path as a flow path for spouting liquid to be cooled, 18... Seawater introduction pipe as a liquid introduction pipe to be cooled, 19... Fixed flange, 2o... Cryogenic medium introduction pipe LNG introduction pipe/agent Attorney Sanemasa Kinoshita (1 person) Figure 1 Figure 2 Figure 3

Claims (3)

[Claims] (1) A method for supplying a cryogenic medium, characterized by directly jetting the cryogenic medium into the liquid phase of a liquid to be cooled. (2) The can wall, which is located in the liquid phase of the storage can containing the liquid to be cooled, has a support flange on the outside of the can [one nozzle mounting pipe that communicates between the inside and outside of the can, and inside this nozzle mounting pipe] A nozzle having a nozzle flange on the proximal end side for spouting a cryogenic medium into the liquid phase is inserted from outside the can, and the nozzle further includes a nozzle flange between the support flange and the nozzle flange. A cryogenic medium supply device, characterized in that a cryogenic medium introduction pipe having a clamping fixed flange is connected thereto. (3) The apparatus for supplying a cryogenic medium according to claim 2, characterized in that a flow path for ejecting the liquid to be cooled is formed in the vicinity of the nozzle.