JPH07194928A - Multitubular gas-liquid contact apparatus - Google Patents

Abstract

PURPOSE:To obtain an apparatus in which a large vibration of the froth layer in a liquid tank is prevented in advance by a method in which the lower end of a partition member is positioned at the same level with the gas exhaust nozzle of a gas introduction pipe or below the nozzle, while the upper end is located between the exhaust nozzle and the surface of the froth layer. CONSTITUTION:A partition member 3 is a partition wall in a bubble passage area (a). The lower end of the partition member 3 is positioned at the same level with the gas exhaust nozzle 2 of a gas introduction pipe l, or close to or below the nozzle 2. The upper end of the partition member 3 is located at an optional position between the exhaust nozzle 2 and the surface 5 of a froth layer, for example, between a stationary liquid surface 4 before the operation of an apparatus, close to the stationary liquid surface 4, or in the intermediate part between the exhaust nozzle 2 and the stationary liquid surface 4. A plurality of gas introduction pipes 1 are supported by these partition members 3 so that a plurality of bubble passage ares (a) are formed by the partition members 3 in the liquid tank.

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 contactor for contacting a gas with a liquid (including slurry liquid), and more particularly to a multi-tube gas-liquid contactor suitable as a flue gas desulfurization device. is there.

[0002]

2. Description of the Related Art A liquid is contained in a large liquid tank, and a large number of gas introducing pipes having gas ejection holes on the lower peripheral wall are vertically provided in the liquid, and the gas introduced into the gas introducing pipe is ejected. Apparatuses for ejecting gas into a liquid through a hole to make gas-liquid contact are widely known (Japanese Patent Publication No. 55-37295, Japanese Patent Publication No. 57-6375, Japanese Patent Publication No. 59-11322, etc.).

FIG. 8 shows a schematic view of a conventional gas-liquid contactor used as a flue gas desulfurizer. In FIG.
Flue gas containing SO ₂ is discharged from the gas conduit 101 to the gas introduction pipe 1
A gas jet port provided on the lower peripheral wall surface of the gas introduction pipe 103 passes through 03 and is jetted into a slurry liquid of a calcium compound such as calcium hydroxide or calcium hydroxide. In this case, the gas introduction pipe 103 has a gas ejection hole 104 arranged on the lower peripheral wall surface thereof, as shown in FIG. 9 or 10. The flue gas ejected into the slurry liquid of the calcium compound in the liquid tank comes into contact with the slurry liquid, and SO ₂ contained in the flue gas reacts with the calcium compound to become CaSO ₃ . Then, this CaSO ₃ reacts with oxygen in the air introduced into the liquid from the air introducing pipe 106 at the lower part of the liquid tank to form C.
It becomes aSO ₄ (gypsum). Incidentally, 112 is a gas-liquid separator for capturing the liquid in the gas, 105 is a stirring blade, and 108 is a gypsum slurry withdrawal pipe. The flue gas desulfurization device shown in FIG. 8 is actually a very large device,
The inner diameter of the liquid tank 102 is 10 m or more, usually 25 m or more, and the number of the gas introducing pipes 103 is an extremely large number of 1,000 or more.

In such a gas-liquid contact device, gas is ejected into the liquid from the gas ejection holes of the gas introduction pipe, and this causes the entire floss layer (foam layer) in the liquid tank. As a result, there is a rare case where a steady and periodic large fluctuation occurs under certain conditions. Then, due to the fluctuation of the floss layer, the upper surface of the floss layer in the liquid tank largely changes. The steady fluctuation of the floss layer increases as the size of the liquid tank increases, which causes problems such as deterioration of gas-liquid contact efficiency.

[0005]

DISCLOSURE OF THE INVENTION The present invention provides a multi-tube type gas-liquid contactor having a structure in which a large number of gas introduction pipes having gas ejection holes on the lower peripheral wall are suspended in a stationary liquid. It is an object of the present invention to provide a device that prevents the occurrence of large fluctuations of the floss layer in the liquid tank due to the ejection of gas into the liquid.

[0006]

The present inventors have completed the present invention as a result of intensive studies to solve the above problems. That is, according to the present invention, a large number of gas introduction pipes having gas ejection holes on the lower peripheral wall surface in the large liquid tank are vertically installed so that the gas ejection holes are located below the stationary liquid surface in the liquid tank. In the gas-liquid contactor having a plurality of partition members, the lower end thereof is located at the same level as or near or below the gas ejection hole of the gas introduction pipe, and the upper end thereof is located at an intermediate portion between the gas ejection hole and the upper surface of the floss layer. It is characterized in that it is vertically installed in the liquid tank so as to be positioned, and that the partition members are supported by a plurality of gas introduction pipes, and a plurality of bubble passage sections surrounded by the partition members are formed in the liquid tank. A multi-tubular gas-liquid contactor is provided.

The partitioning member used in the present invention may have any shape such as a plate shape or a plate structure as long as it can be supported by a gas introducing pipe vertically provided in a liquid. . The material of the partition member may be metal, plastic, ceramic, or the like. Further, the partition member can be a porous body (wire mesh, porous plate, fiber plate, etc.), corrugated plate, or the like.

FIG. 1 shows an explanatory view of an example of a bubble passage section formed by a partition member. FIG. 1A shows a perspective view thereof, and FIG. 1B shows a horizontal sectional view thereof.
FIG. 2 shows an explanatory view of another example of the bubble passage section formed by the partition member. 2A shows a perspective view thereof, and FIG. 2B shows a horizontal sectional view thereof. FIG. 3 shows a horizontal sectional view of still another example of the bubble passage section formed by the partition member. FIG. 4 shows a state explanatory view when bubbles pass through the bubble passage section formed by using the partition member. FIG. 4 (a) shows a horizontal sectional view thereof.
4B is a sectional view taken along line BB of FIG.

In these figures, 1 and 1'denotes a gas inlet pipe, 2 a gas ejection hole formed in the lower peripheral wall surface thereof, 3 a partition member, 4 a stationary liquid surface in the liquid tank, 5 a liquid tank. The upper surface (expanded liquid surface) of the floss layer in the inside, 6 shows the floss layer formed above the level of the gas ejection holes 2. Reference symbol a denotes a bubble passage section formed by the partition member.

The bubble passage section a shown in FIG. 1 shows an example in which a plate-shaped partition member is arranged between adjacent gas introduction pipes 1 and is supported by the gas introduction pipes. One partition passage a is formed by the four partition members 3 supported by the four gas introduction pipes. In the bubble passage section a shown in FIG. 2, the partition member 3 which is prepared in advance to have four blades is arranged at the center of a quadrangle formed by four gas introduction pipes, and the tip of the blade is arranged. Is formed by supporting adjacent gas introduction pipes 1, and the four blades form one bubble passage section a. FIG. 3 shows an example in which an independent gas introduction pipe 1 ′ in which the partition member is not supported is present in the bubble passage section a surrounded by the partition member.

The partition member 3 constitutes a partition wall in the bubble passage section a and can be a plate as shown in FIG. 1 or a plate structure or the like prepared in advance as shown in FIG. Can be The lower end of the partition member 3 is arranged so as to be located at the same level as the gas ejection hole 2 of the gas introduction pipe 1, or in the vicinity thereof (slightly above or slightly below the level of the gas ejection hole 2) or below. The position of the upper end of the partition member 3 is at an intermediate portion between the gas ejection hole 2 and the floss layer, that is,
An arbitrary position between the gas ejection hole 2 and the floss layer upper surface 5, for example, between the stationary liquid surface 4 and the floss layer upper surface 5 before the start of the operation of the apparatus, the vicinity of the stationary liquid surface 4, or the gas ejection hole 2 It can be arranged at a position such as an intermediate portion between the stationary liquid surface 4 (see FIG. 4), a central portion between the gas ejection hole 2 and the floss layer upper surface 5, and the like. As shown in FIG. 4, when the upper end of the partition member 3 is arranged between the gas ejection hole 2 and the stationary liquid surface 4, the partition member 3
The height from the level of the gas ejection hole 2 is 25 to 10 with respect to the distance between the gas ejection hole 2 and the stationary liquid level 4 at the upper end of
It is good to position it so as to be 0%, preferably 40 to 85%. Generally, the upper end thereof is at a height from the level of the gas ejection hole 2 and is 5 to 50 cm, preferably 10 to 3 cm.
It is 0 cm. When the lower end of the partition member 3 is located slightly above the gas ejection hole 2, the position of the lower end is 7.5 cm or less, preferably 0 to 5 cm, in height from the level of the gas ejection hole 2. Is good. Bubble passage section a
If the cross-sectional area of the tank is reduced, the lift effect due to the jetted gas in the compartment will increase, the effect of sinking and raising the liquid in the compartment will also increase, the circulation of the liquid will improve, and the power to stir the liquid will be saved. Become.

FIG. 3 shows an example in which one independent gas introducing pipe which is not joined to the partition member is present in the bubble passage compartment a formed by using the partition member. There may be a plurality of independent gas introduction pipes. This type of gas-liquid contactor is large in size, and the number of gas introduction pipes arranged in the liquid tank is as large as several thousand. In the present invention, a plurality of these independent gas introduction pipes 1 ′, for example, 2 to 16 and preferably 4 to 9 can be present in the bubble passage section a.

FIG. 5 shows an explanatory plan view of the inside of the liquid tank including a large number of bubble passage sections a in which a large number of independent gas introduction pipes are present. In this figure, 10 indicates a liquid tank wall. The liquid tank of FIG. 5 has a structure including a large number of bubble passage sections a having the partition member 3 as a partition wall. A plurality of independent gas introduction pipes (not shown) are arranged in each of the bubble passage sections a. The vertical dimension: n and the horizontal dimension: m in each bubble passage section a are such that the length of n or m of the larger dimension is 1 m or less, preferably 0.25 to 0.5 m. It is better to prescribe. The partition member 3 arranged in the liquid tank according to the present invention can be supported in the liquid tank by any method. For example, a support can be provided above or below the stationary liquid level in the liquid tank and supported by the support, or in a support arranged in a grid to support the gas introduction pipe. Can be supported. In the conventional gas-liquid contact device, a lattice-shaped support body is provided above the liquid surface to support the gas introduction pipe, and this lattice-shaped support body is used for introducing the gas as shown in FIG. It is composed of a gas introduction pipe support portion 11 for supporting and fixing the pipe, and a plate body portion 12 connecting the support portions. In the present invention, when the lattice-shaped gas introduction pipe support is arranged in the lower part of the floss layer and the gas introduction pipe is supported by the floss layer, the four plate members 12 serve as partition members used in the present invention. And a bubble passage compartment according to the invention is formed. Therefore, the bubble passage section a according to the present invention can also be formed by disposing the gas introduction pipe support used in the conventional apparatus below the floss layer.

The principle of the gas-liquid contactor of the present invention will be described with reference to FIG. 4. When a gas is introduced into the gas introduction pipe 1 and the gas is ejected from the gas ejection holes 2 of the gas introduction pipe 1, The fine bubbles generated by the gas ejection move upward after the ejection, enter the bubble passage section a formed by the partitioning member 3, rise in the section a, and form the gas ejection holes 2 of the section a. Above the level, a floss layer 6 composed of a mixture of bubbles and a liquid is generated above the level, and the upper surface of the floss layer is located above the stationary liquid level. In FIG. 4, 4 indicates a stationary liquid level before the gas is introduced into the gas introduction pipe 1, and 5 indicates
The upper surface (expansion liquid level) of the floss layer formed after introducing gas into the gas introducing pipe 1 is shown. The liquid in the liquid tank is sucked into the compartment a from the lower end opening of the compartment a formed by the partition member 3, rises together with the bubbles in the compartment a, and is discharged from the upper end opening of the compartment a. The gas jetted into the liquid tank becomes fine bubbles and efficiently contacts the liquid while rising in the compartment a. Then, the gas bubbles ejected from the gas ejection holes 2 of the gas introduction pipe 1 are gathered in the compartment a and rise in the compartment a, so that the kinetic energy of the liquid flow generated when the bubbles ascend is in that compartment. It is sealed in a and is prevented from being transmitted to other parts, and as a result, the large fluctuation of the floss layer in the liquid tank is prevented.

In the gas-liquid contactor of the present invention, the upper end of the partition member is located at the intermediate portion between the gas ejection hole 2 and the upper surface 5 of the floss layer (see FIG. 4), so that the floss layer in the liquid tank is formed. The upper part can be connected horizontally. By connecting the upper part of the floss layer horizontally in this way,
Since the flow of the floss layer can be performed not only in the one bubble passage section but also between the other sections, the concentration of the dissolved components contained in the liquid contained in the liquid tank is totally It can be made uniform. Further, even when the upper portion of the floss layer is connected in the horizontal direction in this manner, a partition wall by a partition member exists near the gas ejection holes, and the liquid generated suddenly when gas is ejected from the gas ejection holes Since the transfer of the flow energy to other parts is prevented, the occurrence of large fluctuations of the floss layer in the liquid tank is prevented.

[0016]

EXAMPLES Next, the present invention will be described in more detail by way of examples.

Example 1 In a tank type liquid tank having a length of 0.65 m, a width of 1.5 m and a height of 3 m,
A test device having a structure in which a total of eight gas introduction pipes were vertically arranged in two rows in the horizontal direction and four rows in the vertical direction was used. In this case, the gas introduction pipe has a length of 2000 mm and an inner diameter of 100 mm.
A structure having 30 mm holes formed in a horizontal row was used.
Further, the gas introduction pipe was arranged so that the gas ejection holes had a depth of 10 to 25 cm below the stationary water surface. In this test apparatus, the inside of the liquid tank was partitioned by a partition plate as shown in FIG. 7, and this was supported by the gas introducing pipe and the wall of the liquid tank to form 15 bubble passage sections in the liquid tank. . In this case, the top of the partition plate is 4
It was placed at a position of cm, and its lower end was placed at a position of 3 cm in height from the level of the gas ejection hole. The height of water as a liquid was put into the liquid tank of such a test device up to a position of 100 cm, and the gas flow rate per gas introduction pipe was 200 m ³
Air was ejected from the gas ejection port of the gas introduction pipe under the condition of / hour to perform gas-liquid contact. 2 such gas-liquid contact
After continuing for a period of time, substantially no fluctuating motion occurred in the floss layer in the liquid tank, and no substantial fluctuation of the upper surface of the floss layer occurred.

On the other hand, when the same experiment was conducted in the test apparatus without disposing the partition plate, in this case, a large fluctuation of the floss layer in the liquid tank occurred and the upper surface of the floss layer fluctuated. . The fluctuation of the upper surface of the floss layer is + 40c at the highest position on the upper surface of the floss layer with respect to the stationary water surface.
m, the lowermost position on the upper surface of the floss layer was about -40 cm.

[0019]

According to the present invention, since the inside of the liquid tank is configured to have a plurality of bubble passage sections, the rapid flow of the liquid that occurs when the gas is ejected from the gas ejection holes of the gas introduction pipe into the liquid. Energy is primarily sealed within that compartment, and the flow energy of the liquid is much less transferred to other compartments, resulting in the occurrence of large froth layer wobble in the bath. To be prevented. In the conventional gas-liquid contact device, the flow energies of the liquid generated when the gas is ejected from the gas ejection holes of the gas introduction pipes into the liquid depending on the conditions do not interfere with each other because the partition member does not exist. Therefore, as a whole, a steady and periodic large fluctuation of the floss layer is generated, which causes a problem that the upper surface of the floss layer is fluctuated and the gas-liquid contact efficiency is deteriorated.However, in the case of the present invention, As described above, since the inside of the liquid tank is configured to have a plurality of bubble passage sections, the rapid flow energy of the liquid caused by the gas jet from the gas jet holes is sealed in this section, and Since the transfer to the air bubble passage section is prevented, the above problems as found in the conventional gas-liquid contact device are solved all at once. Moreover, in the bubble passage section, since the lift effect due to the jetted gas is obtained, the fresh liquid existing below the gas introduction pipe is swept upward in the section and mixed with the bubbles in the section. There is an advantage. The gas-liquid contactor of the present invention is used as a reaction apparatus involving various gas-liquid contacts, for example, contact between an exhaust gas containing sulfurous acid gas and an alkaline liquid such as a slurry liquid of a calcium compound such as calcium carbonate or calcium hydroxide. It is preferably applied as a flue gas desulfurization device for performing the above, a carbon dioxide gas device for contacting an exhaust gas containing carbon dioxide with an alkaline liquid, and the like. Particularly, the device of the present invention has a liquid tank having a diameter of 10 m or more,
In particular, it can be advantageously used as a large flue gas desulfurization device having a length of 20 m or more.

[Brief description of drawings]

FIG. 1 is an explanatory view of an example of a bubble passage section formed by a partition member. a: perspective view b: horizontal sectional view

FIG. 2 is an explanatory view of another example of a bubble passage section formed by a partition member. a: perspective view b: horizontal sectional view

FIG. 3 is a horizontal sectional view of still another example of the bubble passage section formed by the partition member.

FIG. 4 is an explanatory view of a state when bubbles pass through a bubble passage section formed by using a partition member. a: Horizontal sectional view b: BB sectional view of FIG.

FIG. 5 is an explanatory plan view of the inside of a liquid tank including a large number of bubble passage sections in which a plurality of independent gas introduction pipes are present.

FIG. 6 shows a perspective view of a support body for supporting and fixing a gas introduction pipe arranged in a conventional device.

FIG. 7 shows an explanatory plan view of the inside of the liquid tank used in the examples.

FIG. 8 shows a schematic diagram of a conventional gas-liquid contactor used as a flue gas desulfurizer.

FIG. 9 is a structural explanatory view of an example of a gas introduction pipe.

FIG. 10 is a structural explanatory view of another example of the gas introduction pipe.

[Explanation of symbols]

 1, 1 ', 103 Gas introduction pipe 2, 104 Gas ejection hole 3 Partition member 4 Still liquid surface 5 Upper surface of floss layer 6 Floss layer 101 Gas conduit 102 Liquid tank 105 Stirring blade 106 Air introduction pipe 108 Gypsum slurry extraction pipe a Bubble passage section

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location B01D 53/77 B01J 10/00 104 8822-4G B01D 53/34 125 E (72) Inventor Kenji Kobayashi 2-12-1, Tsurumi Chuo, Tsurumi-ku, Yokohama-shi, Kanagawa Chiyoda Kakoh Construction Co., Ltd. (72) Inventor, Ikuro Kuwahara 2--12-1, Tsurumi Chuo, Tsurumi-ku, Yokohama-shi, Kanagawa Chiyoda Kakoh Construction Co., Ltd.

Claims (4)

[Claims] 1. A gas having a structure in which a large number of gas introduction pipes each having a gas ejection hole on a lower peripheral wall surface in a large liquid tank are vertically installed so that the gas ejection hole is located below a stationary liquid surface in the liquid tank. In the liquid contact device, the plurality of partition members are arranged such that the lower ends thereof are located at the same level as or near or below the gas ejection holes of the gas introduction pipe, and the upper ends thereof are located in the intermediate portion between the gas ejection holes and the upper surface of the floss layer. In the liquid tank,
A multi-tube gas-liquid contactor characterized in that the partition members are supported by a plurality of gas introduction pipes, and a plurality of bubble passage sections surrounded by the partition members are formed in the liquid tank. 2. The gas-liquid contact device according to claim 1, wherein a partition member is vertically provided between adjacent gas introduction pipes and supported by the gas introduction pipes. 3. The gas-liquid contactor according to claim 1, wherein at least one independent gas introduction pipe is present in the bubble passage section surrounded by the partition member. 4. The gas-liquid contactor according to claim 1, which is for carrying out a catalytic reaction between a gas containing an acidic gas and an alkaline liquid.