JP2010234275A - Foam diameter controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To control the diameter of a generated foam without being affected by an introduced amount of gas. <P>SOLUTION: The foam b is forcibly cut off by a stirring rotary plate 3 before the foam b released into a solution from a gas releasing surface 18 grows by providing a gas releasing nozzle 13 inside a container 1 and providing at least one stirring rotary plate 3 relative to the gas releasing surface 18 of the gas releasing nozzle 13. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a bubble diameter control device capable of controlling a bubble diameter.

  Conventionally, as shown in FIG. 6, the gas hydrate production apparatus is provided with a stirrer 111 for stirring water W and a circulating gas blower 112 for extracting the raw material gas G in the generator 101, and further, the discharge of the circulating gas blower 112. The outlet is connected to a nozzle 113 arranged at the bottom in the container. Further, since the generation of gas hydrate is accompanied by heat generation, the circulating slurry pump 115 is connected to the bottom of the container to extract the gas hydrate slurry and return to the top of the container via the cooler 116. The temperature in 101 is kept at the set temperature. And the gas hydrate produced | generated with the generator 101 is continuously extracted by the slurry transfer pump 120 from the bottom part of the generator 101, and is supplied to the lower part of the dehydration tower (not shown) (for example, patent document 1). reference.).

  Although the nozzle 113 can bubble a large amount of source gas, it is practically useful. However, as shown in FIG. 7, the diameter D of the bubble b is larger than the diameter d of the nozzle hole 113a. Instead, as shown in FIG. 8, when the interval L between the adjacent nozzle holes 113a and 113a is narrow, the bubbles b 'and b' are joined together to form one large bubble b ". There is concern about a reduction in the reaction efficiency of the reaction to gas hydrate.

  On the other hand, as shown in FIG. 9, the device for miniaturizing bubbles is composed of an audio speaker 201, a conduit 202, a signal generator 203, etc., and an arbitrary waveform generated by the signal generator 203 is converted into a sound wave by the audio speaker 201. Although the thing which controlled generation | occurrence | production of a bubble using a pressure fluctuation is known, it is unsuitable for a large amount of gas processing, and cannot be used industrially. Incidentally, a hole of about 200 μm is formed in the side surface of the conduit 202. In the figure, reference numeral 204 denotes an audio amplifier, 205 denotes a pressure controller, and 206 denotes a gas cylinder (for example, see Non-Patent Document 1).

  Further, in the venturi type fine bubble generation mechanism, there is a limit to the amount of gas introduced. In addition, the optimum operating condition range is narrow and difficult to use industrially.

JP 2006-95417 A Toshiyuki Sanada, “Submillimeter-scale bubble generation control and its measurement”, Newsletter flow, April 2008 issue (published by Shizuoka University), [online], [2009.02.24 search], Internet <URL: http: // www .jsme-fed.org / newsletters / 2008 4 / no3.html>

  An object of the present invention is to provide a bubble diameter control device capable of controlling the generated bubble diameter regardless of the amount of gas introduced.

  The bubble diameter control apparatus according to the present invention is provided with a gas discharge nozzle in a container, and at least one stirring rotating plate is provided with respect to the gas discharge surface of the gas discharge nozzle, and is discharged from the gas discharge surface into the liquid. Before the bubbles that grow are forcibly grown, the bubbles are forcibly cut off by a stirring rotating plate.

  The bubble diameter control apparatus according to the present invention is characterized in that the bottom or side surface of the stirring rotary plate is opposed to the gas discharge surface of the gas discharge nozzle.

  The bubble diameter control device according to the present invention is provided with at least one gas discharge nozzle in a container, covers the upper side of the gas discharge nozzle with a bowl-shaped cover, and moves from the entrance of the cover toward the outlet. The bubbles are forcibly blown off by a jet flow before the bubbles are ejected from the gas discharge surface of the gas discharge nozzle and grow into the liquid.

  The bubble diameter control apparatus according to the present invention is characterized in that the opening of the gas discharge surface of the gas discharge nozzle is 2 to 100 μm.

  According to the present invention, the bubble generation diameter can be controlled by the opening of the gas discharge surface of the gas discharge nozzle and the stirring speed by the stirring plate or the jet water flow speed. Further, when a large amount of gas is introduced, the bubble diameter can be controlled. Furthermore, since bubble separation is performed before bubble growth occurs, it is possible to make the bubble diameter smaller than the bubble diameter generated by the sintered element alone.

It is a schematic block diagram of the gas hydrate manufacturing apparatus provided with the bubble diameter control apparatus of this invention. It is a partial cross section side view which shows an example of the bubble diameter control apparatus of this invention. It is operation | movement explanatory drawing of the bubble diameter control apparatus of this invention. It is a partial cross section side view which shows another example of the bubble diameter control apparatus of this invention. It is a partial cross section side view which shows another example of the bubble diameter control apparatus of this invention. It is a front view of the bubble diameter control apparatus of FIG. It is a schematic block diagram of the conventional gas hydrate manufacturing apparatus. It is explanatory drawing which shows the relationship between a nozzle hole and a bubble. It is explanatory drawing which shows the relationship between a nozzle space | interval and a bubble. It is a schematic block diagram of the bubble generation control apparatus using gas pressure fluctuation | variation.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In this example, the case where the bubble diameter control apparatus is applied to a gas hydrate manufacturing apparatus will be described. However, the present invention is not limited to this, and the bubble diameter control apparatus of the present invention can be applied to the promotion of mass transfer. .

  As shown in FIG. 1, the gas hydrate production apparatus of the present invention includes a gas hydrate generator 1 provided with a bubble diameter control device 11 that also serves to stir water W, and a circulating gas blower 12 that extracts a raw material gas G. Further, the discharge port of the circulating gas blower 12 is connected to a gas discharge nozzle 13 disposed at the bottom of the container. Since the generation of gas hydrate is accompanied by heat generation, the circulating slurry pump 15 is connected to the bottom of the container to extract the gas hydrate slurry and return to the upper part of the container via the cooler 16. The temperature in the rate generator 1 is kept at a set temperature. And the gas hydrate produced | generated with the gas hydrate generator 1 is continuously extracted by the slurry transfer pump 20 from the bottom part of the gas hydrate generator 1, and is supplied to the lower part of a dehydration tower (not shown). .

  As shown in FIG. 2, the bubble diameter control device 11 includes two rectangular stirring rotor blades 3a on the rotary shaft 2, and two right-angled triangular stirring rotor blades 3b having the same height as the stirring rotor blade 3a. Two right-angled triangular stirring rotor blades 3c lower than the stirring rotor blades 3b are radially provided at intervals of 60 degrees clockwise or counterclockwise. And the base 4 of the stirring rotary blades 3a to 3c is opposed to the upper surface (gas discharge surface) of the gas discharge nozzle 13. The rotating shaft 2 is driven by an electric motor 6. The number of stirring rotor blades may be one or three to four. That is, it is sufficient that the number of stirring rotor blades is at least one.

  The number of rotations of the rotating shaft 2 is preferably in the range of 800 to 2,000 rpm and higher, but considering the stirring power, the range of 900 to 1,200 rpm is preferable.

  The gas discharge nozzle 13 is obtained by mounting a plate-like sintered element 8 in a bottomed and uncovered container 7, and a raw material gas supply pipe 9 is provided at the bottom of the container. As the sintered element, one having an opening of 2 to 100 μm is preferable. Furthermore, the thing of the range of 2-10 micrometers is more preferable.

  Further, it is important that the bottom 4 of the stirring rotor blades 3a to 3c is brought close to the upper surface (gas release surface) of the sintered element 8. However, in consideration of wear or damage due to contact, the stirring rotor blades 3a to 3c are used. The gap Δt between the bottom 4 of 3c and the upper surface (gas release surface) of the sintered element 8 is preferably 5 mm or less. Furthermore, the range of 1-2 mm is more preferable. If desired, a flexible spatula member made of soft synthetic resin or the like may be attached to the bottom 4 of each of the stirring blades 3a to 3c.

  Now, when the raw material gas G is supplied from the gas supply pipe 9 to the gas discharge nozzle 13 while rotating the stirring rotary blades 3a to 3c of the bubble generation control device 11 at a predetermined rotational speed, as shown in FIG. Since the bubbles b released from the fine holes 19 of the element 8 into the water W are not grown, the bubbles are cut by the stirring rotary blade 3, so that the bubble diameter can be made smaller than the generated bubble diameter of the sintered element alone. . As a result, the reaction efficiency between the source gas G and the water W increases.

  In the above description, the bubble diameter control device 11 in which the bottom 4 of the stirring rotor blades 3a to 3c is opposed to the sintered element 8 of the gas discharge nozzle 13 is not limited to this. For example, as shown in FIG. Further, the side surface 5 of the stirring rotary blade 3 a may be opposed to the sintered element 8 of the gas discharge nozzle 13. In the case of FIG. 4, a rectangular stirring rotor 3a is used as the stirring rotor.

  As shown in FIG. 5, the bubble diameter control device 11 is provided with the gas discharge nozzles 13 on the four surfaces of a square cylinder 21 having a square cross section and a quadrangular pyramid-shaped dispersion 24 in the square cylinder 21. It is provided that water W in the gas hydrate generator 1 is jetted from the inlet 22 to the outlet 23 of the rectangular tube 21 to blow off the bubbles on the upper surface (gas discharge surface) 18 of the sintered element 8 by the jet water flow. Anyway. In addition, the cross-sectional shape of the rectangular tube is not limited to a square, and an arbitrary shape can be selected. Further, the shape of the dispersion 24 needs to match the cross-sectional shape of the rectangular tube.

1 container 3 stirring rotating plate 13 gas discharge nozzle b bubble

Claims (3)

  A gas discharge nozzle is provided in the container, and at least one agitation rotating plate is provided for the gas discharge surface of the gas discharge nozzle. Before the bubbles discharged from the gas discharge surface into the liquid grow, the bubbles A bubble diameter control device characterized by forcibly cutting the water with a stirring rotating plate.   2. The bubble diameter control device according to claim 1, wherein the bottom or side surface of the stirring rotating plate is opposed to the gas discharge surface of the gas discharge nozzle.   A gas discharge nozzle is provided on the side of the rectangular tube, a pyramid-shaped dispersion is provided in the rectangular tube, and water in the gas hydrate generator is sprayed from the inlet to the outlet of the rectangular tube, A bubble diameter control device for forcibly blowing off the bubbles by a jet water flow before the bubbles released from the gas discharge surface of the discharge nozzle grow into the liquid.

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