JP2796546B2 - Multi-tube gas-liquid contact device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-tube gas-liquid contact device for bringing a gas into contact with a liquid (including a slurry liquid), and more particularly to a multi-tube gas-liquid contact device suitable as a flue gas desulfurization device. is there.

[0002]

2. Description of the Related Art A liquid is accommodated in a large liquid tank, and a large number of gas introduction pipes having gas ejection holes on the lower peripheral wall are vertically suspended in the liquid, and the gas introduced into the gas introduction pipe is ejected with gas. Apparatuses for causing gas-liquid contact by ejecting the liquid from a hole into a liquid are widely known (JP-B-55-37295, JP-B-57-6375, JP-B-59-11322, etc.).

FIG. 3 is a schematic view of a gas-liquid contact device used as a flue gas desulfurization device. In FIG. 3, SO ₂
Is passed through the gas introduction pipe 103 from the conduit 101 and is ejected from a gas ejection port provided on the lower peripheral wall surface of the gas introduction pipe 103 into a slurry of a calcium compound such as calcium carbonate or calcium hydroxide. . As shown in FIG. 4, the gas introduction pipe 103 in this case has a gas ejection hole 104 provided on the lower peripheral wall surface. The smoke exhausted into the calcium compound slurry in the liquid tank comes into contact with the slurry, and SO ₂ contained in the smoke reacts with the calcium compound to become CaSO ₃ . And this C
The aSO ₃ reacts with oxygen in the air introduced into the liquid from the air introduction pipe 106 at the lower part of the liquid tank to become CaSO ₄ (gypsum). Reference numeral 112 denotes a gas-liquid separator for capturing the liquid in the gas, 105 denotes a stirring blade, and 108 denotes a gypsum slurry extraction pipe. The flue gas desulfurization device shown in FIG. 3 is actually a very large device, and the inner diameter of the liquid tank 102 is 10 m or more, usually 25 m or more, and the number of gas introduction pipes 103 is 1,000. This is an extremely large number of books.

[0004] In such a gas-liquid contact device, gas is ejected into the liquid from the gas ejection hole of the gas introduction pipe, and this causes a floss layer (foam layer) in the liquid tank. As a whole, a steady and periodic large fluctuation may occur. Then, due to the fluctuation of the floss layer, the upper surface of the floss layer in the liquid tank fluctuates greatly. This steady fluctuation of the floss layer becomes larger as the liquid tank becomes larger, which may cause a decrease in gas-liquid contact efficiency, and in some cases, a gas introduction pipe installed in the liquid tank wall or in the liquid tank. It is conceivable that a large external force is applied to the equipment such as the above, causing a failure of the equipment.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a multi-tube gas-liquid contact device having a structure in which a number of gas introduction pipes having gas ejection holes on the lower peripheral wall are suspended in a liquid. It is an object of the present invention to provide a device that prevents large fluctuations of a floss layer in a liquid tank due to gas injection into the liquid tank, and that does not apply a large external force to equipment such as a liquid tank wall and a gas introduction pipe. And

[0006]

Means for Solving the Problems The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, have completed the present invention. That is, according to the present invention, a structure in which a large number of gas introduction pipes having gas ejection holes in the lower peripheral wall surface are provided vertically in a large liquid tank such that the gas ejection holes are located below the stationary liquid level in the liquid tank. In the gas-liquid contact device having a multi-tube type, a partition member is disposed in the liquid tank so as to surround one or more gas introduction pipes, and a plurality of bubble passage sections are formed. A gas-liquid contact device is provided. Further, according to the present invention, a large number of gas introduction pipes having gas ejection holes in the lower peripheral wall surface in a large-sized liquid tank are vertically provided such that the gas ejection holes are located below the stationary liquid level in the liquid tank. In the gas-liquid contacting device having the above, the partition member is vertically suspended in the liquid tank such that the lower end thereof is located below the gas ejection hole of the gas introduction pipe, and one or a plurality of gas introductions into the liquid tank. A multi-tube gas-liquid contact device is provided, wherein a plurality of bubble passage sections surrounding a tube are formed.

The present inventors have found that the steady fluctuation of the floss layer in the multi-tube type gas-liquid contact device is caused by gas ejection as described above, and by dispersing or absorbing such gas ejection energy, It has been discovered that large fluctuation of the floss layer surface in the tank can be prevented. That is, when the partition member is installed in the liquid tank so as to surround one or a plurality of gas introduction pipes, it has been found that the partition member suppresses the accumulation and superposition of wave-making energy due to gas ejection extremely effectively. The present invention has been completed.

[0008] The partition member used in the present invention may have any shape as long as a large number of gas introduction pipes vertically provided in the liquid are provided for each or a plurality of pipes, and the liquid in the tank can be substantially partitioned. . Further, as the partition form, a triangle, a square, a rectangle, a polygon, a circle, a multiple circle, an ellipse, an axle, a radial, a combination thereof, or the like is used. Any shape can be used as the shape of the partition member as long as it can absorb and disperse the gas ejection energy blown from the gas introduction pipe or absorb and disperse the wave forming energy near the liquid surface of the liquid tank. Therefore, as a shape of the partition member, in addition to a normal flat plate or a cylinder, a corrugated plate, a lattice plate, a perforated plate and a cylindrical member thereof, and a member having a wave-absorbing structure such as unevenness attached to the surface thereof, or And the like having a shape composed of combinations of the above. In addition to metal, the material of the partition member may be plastic or ceramic, a composite material thereof, a combination material thereof, a knitted or cloth made of metal or synthetic polymer, or a combination thereof. Usually, the partition member is installed vertically to the liquid passage in the liquid tank, but it can also be fixed or floated horizontally on the liquid surface depending on the shape of the partition member. In this case, a lattice-shaped support usually provided for supporting the gas introduction pipe can also be used. By exposing the partition member on the floss layer surface in the liquid tank, it is possible to prevent the fluctuation of the floss layer surface from diffusing to other partition sections, but it may be installed below the floss layer surface. That is, even if the upper end of the partition member is set in the floss layer, the gas ejection energy is dispersed if the lower end collides with the gas partition portion ejected from the gas introduction pipe, so that the wave forming energy is reduced. Accumulation and superposition are suppressed. Therefore, it is preferable that the vicinity of the lower end of the partition member is located below the gas ejection hole of the gas injection pipe. It may be located above the gas ejection hole depending on conditions and the like.

FIG. 1 is an explanatory view of a bubble passage section according to one embodiment of the present invention in which a large number of gas introduction pipes are formed one by one using a partition member. In FIG. 1, reference numeral 1 denotes a gas introduction pipe, 2 denotes a gas ejection hole formed in a lower peripheral wall thereof,
Denotes a partition member, 4 denotes a stationary liquid level in the liquid tank, 5 denotes an upper surface (expanded liquid level) of the floss layer formed in the liquid tank, and 6 denotes a floss layer made of a mixture of bubbles and liquid. a is a bubble passage section formed by the partition member 3 and includes the gas introduction pipe 1 therein.

FIG. 1 is an explanatory view of a bubble passage section formed by partitioning a large number of gas introduction pipes one by one using a partition member. However, it is not necessary to partition the gas introduction pipes one by one. It can be divided into multiple pieces. This type of gas-liquid contact device is large, and the number of gas introduction pipes provided in the liquid tank is as large as several thousand. The number of gas introduction pipes divided by the partition member is determined by the partition form, shape, installation method, operating conditions of the gas-liquid contact device, and the like of the partition member. In general, the smaller the number of gas introduction pipes divided by the partition member, the more difficult it is for the wave-making energy to be accumulated and superimposed by gas ejection. Gypsum) tends to be difficult to uniformly diffuse in the liquid tank. For this reason, in the present invention, a plurality of these gas introduction pipes, for example, 2 to 2
It is good to partition every 0, preferably every 4-40. However, in some cases, more preferable gas-liquid contact reaction can be performed by partitioning every tens to hundreds of tubes for the reasons described above. Further, the number of gas introduction pipes divided by the partition member does not necessarily have to be constant throughout the liquid tank.

FIG. 2 is an explanatory plan view showing the inside of a liquid tank including a large number of gas passage sections formed by dividing a large number of gas introduction pipes into a plurality of pipes. In this figure, reference numeral 10 denotes a liquid tank wall. In the liquid tank of FIG. 2, a large number of bubble passage sections a are formed in which a plate is disposed vertically and horizontally in the liquid tank, and a cylindrical partition member 3 having a rectangular cross section is used as a partition wall in the liquid tank. It is of the structure that was done. In each of these sections a, a plurality of gas introduction pipes (not shown) are provided. The vertical dimension of each compartment a: n and horizontal dimensions: m, the horizontal cross-sectional area of the partition a is 10 m ² or less, and it is preferably defined to be 1 to 4 m ^2. However, these horizontal cross-sectional area without necessarily be a constant and the partition forms as described above, the shape of the partition member, so that several 10m ² ~100m ² by operating conditions such as the installation method or gas-liquid contact device May be specified. The partition member 3 provided in the liquid tank according to the present invention can be supported in the liquid tank by an arbitrary method. For example, a support may be provided above or below the liquid level in the liquid tank and supported by the support, or may be supported by a support arranged in a grid to support the gas introduction pipe. be able to.

In the gas-liquid contact device of the present invention, when the upper end of the partition member is located below the upper surface (expanded liquid level) 5 of the floss layer (see FIG. 1), the floss contained in the liquid tank The top of the layer can be connected horizontally. By connecting the upper portion of the floss layer in the horizontal direction in this way, the flow of the floss layer can be caused to flow not only in one of the compartments but also with the other compartments. The concentration of the dissolved component contained in the liquid thus obtained can be made uniform throughout. In this case, the upper end of the partition member has a height from the level of the gas ejection holes 2.
For the distance between the gas outlet 2 and the stationary liquid level 4, 70
It is good to position so that it may be ~ 130%. Generally, the upper end is the height from the level of the stationary liquid level 4,
5 to +10 cm. Further, even when the upper floss layer is connected in the horizontal direction in this way, a partition wall by the partition member exists near the gas ejection hole, and the flow energy of the liquid given by the liquid when the gas is ejected from the gas ejection hole. Since the transmission to other parts is prevented, the waves and fluctuations of the floss layer in the liquid tank are suppressed.

[0013]

According to the present invention, since the inside of the liquid tank is constituted by a plurality of bubble passage sections, the wave-making energy of the liquid generated when the gas is jetted into the liquid from the gas jet holes of the gas inlet tube. Is primarily sealed in that compartment, and the wave-making energy of the liquid is very unlikely to be transmitted to other compartments, resulting in floss layer waves and Oscillation of the floss layer is prevented. In the conventional gas-liquid contact device, the respective flows of the liquid generated when the gas is jetted into the liquid from the gas ejection holes of the respective gas introduction pipes interfere with each other due to the absence of the partition member, thereby causing the flow of the floss layer. It is easy to get upset. For this reason, the flows of the liquids sometimes overlap with each other, resulting in a steady and periodic large fluctuation of the floss layer as a whole, and the liquid level may fluctuate, thereby deteriorating the gas-liquid contact efficiency. In some cases, this may cause a failure of the equipment in the liquid tank, but in the case of the present invention, as described above, since the liquid tank is configured with a plurality of bubble passage sections, it is caused by gas ejection. The tangential flow of gas-liquid
Since the cell is sealed in the compartment and prevented from being transmitted to other compartments, the above-mentioned problem as seen in the conventional gas-liquid contact device can be solved at once. In addition, in the bubble passage section, since a lift effect by the ejected gas is obtained, fresh liquid existing below the gas introduction pipe is sunk upward in the bubble passage section and mixed with bubbles in the section. The advantage is that

The gas-liquid contact device of the present invention is used as a reaction device involving various gas-liquid contacts. For example, a flue gas desulfurization device for contacting an exhaust gas containing a sulfurous acid gas with an alkaline liquid such as a calcium carbonate slurry solution. Also, the present invention is preferably applied as a decarbonation device for contacting an exhaust gas containing carbon dioxide with an alkaline liquid. In particular, the apparatus of the present invention can be advantageously used as a large flue gas desulfurization apparatus having a liquid tank having a diameter of 10 m or more, particularly 20 m or more.

[0015]

Next, the present invention will be described in more detail with reference to examples.

Example 1 A test apparatus having a structure in which a total of eight gas inlet pipes are arranged in two rows in a horizontal direction and four rows in a vertical direction in a tank type liquid tank having a length of 1 m, a width of 2 m and a height of 1 m. Was used. In this case, the gas introduction pipe has a hole diameter of 20 to 3 on the peripheral wall at a position of 150 to 300 mm from the lower end of the cylindrical pipe having a length of 2000 mm and an inner diameter of 100 mm.
One having a structure in which 0 mm holes were formed in a horizontal row was used. In addition, this gas introduction pipe has a
It was arranged to have a depth of 0 to 25 cm. In this test apparatus, the inside of the liquid tank was partitioned by a partition plate into two gas introduction pipes, and four bubble passage sections were formed in the liquid tank. In this case, the upper end of the partition plate was located at a position on the still water surface, and the lower end thereof was positioned at a depth of 30 to 40 cm below the still water surface. Water is introduced as a liquid into the liquid tank of such a test device up to a height of 100 cm, and air is supplied from the gas inlet tube under the condition of a gas flow rate per gas inlet tube of ³⁰ to 200 m ³ / hour. Air-water contact was made by jetting from the spout. In such gas-liquid contact, repeated and continuous experiments showed that
No significant wave fluctuation occurred in the floss layer in the liquid tank, and substantially no fluctuation of the floss layer surface occurred.

On the other hand, when a similar experiment was conducted without using a partition plate in the test apparatus, in this case,
The floss layer surface fluctuated.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a bubble passage section formed by partitioning a large number of gas introduction pipes one by one using a partition member.

FIG. 2 is an explanatory plan view showing the inside of a liquid tank including a bubble passage section formed by dividing a plurality of gas introduction pipes into a plurality of pipes using a partition member.

FIG. 3 is a schematic view showing an example of a conventional gas-liquid contact device used as a flue gas desulfurization device.

FIG. 4 is a structural explanatory view of an example of a gas introduction pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 103 Gas introduction pipe 2, 104 Gas ejection hole 3 Partition member 4 Static liquid level 5 Floss layer upper surface 6 Floss layer 101 Gas conduit 102 Liquid tank 105 Stirring blade 106 Air introduction pipe a Bubble passage section

──────────────────────────────────────────────────の Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B01D 53/14-53/18 B01D 53/34 B01J 10/00-12/02 B01D 47/00-47 / 18

Claims (3)

(57) [Claims] 1. A gas having a structure in which a large number of gas introduction pipes having gas ejection holes on the lower peripheral wall surface in a large liquid tank are vertically provided such that the gas ejection holes are located below a stationary liquid level in the liquid tank. In a liquid contact device, a multi-tube gas-liquid contact is characterized in that a partition member is disposed in the liquid tank so as to surround one or more gas introduction pipes, and a plurality of bubble passage sections are formed. apparatus. 2. The gas-liquid contact device according to claim 1, wherein the partition member is vertically provided in the liquid tank such that a lower end thereof is located below the gas ejection hole. 3. The gas-liquid contact device according to claim 1, which performs a contact reaction between a gas containing an acid gas and an alkaline liquid.