JPH07178310A - Multi-tube gas-liquid contact device - Google Patents

Abstract

(57) [Summary] [Purpose] In 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 the liquid, the gas from the gas ejection holes into the liquid Prevents the occurrence of large fluctuations of the floss layer in the liquid tank due to jetting,
(EN) Provided is a device that does not apply a large external force to equipment such as a liquid tank wall and a gas introduction pipe. [Structure] Gas-liquid contact having a structure in which a large number of gas introduction pipes having gas ejection holes on the lower peripheral wall in a 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 apparatus, a multi-tube gas-liquid contactor is characterized in that a partition member is arranged in the liquid tank so as to surround one or a plurality of gas introduction tubes, and a plurality of bubble passage sections are formed.

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 a slurry liquid), and more particularly to a multi-tube gas-liquid contactor suitable as a flue gas desulfurizer. 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. 3 shows a schematic view of a gas-liquid contact device used as a flue gas desulfurization device. In FIG. 3, SO ₂
The flue gas containing the gas passes from the conduit 101 through the gas introduction pipe 103 and is ejected into the slurry liquid of the calcium compound such as calcium carbonate or calcium hydroxide from the gas ejection port provided on the lower peripheral wall surface of the gas introduction pipe 103. . As shown in FIG. 4, the gas introduction pipe 103 in this case has a gas ejection hole 104 arranged on the lower peripheral wall surface thereof. The flue gas ejected into the calcium compound slurry liquid 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 . And this C
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). 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. 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 the gas introduction pipes 103 is 1,000. This is an extremely large number of books 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, which causes the floss layer (foam layer) in the liquid tank. As a whole, steady and periodic large fluctuations may occur. 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 becomes larger as the liquid tank becomes larger, which may cause deterioration of gas-liquid contact efficiency, and in some cases, the wall of the liquid tank or the gas introduction pipe installed in the liquid tank. It is conceivable that a large external force will be applied to equipment such as the above, which will cause failure of those equipment.

[0005]

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

[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 multi-tube type, a partition member is arranged in the liquid tank so as to surround one or a plurality of 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 introducing 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 the above-mentioned, the partition member is vertically installed 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 gases are introduced into the liquid tank. Provided is a multi-tubular gas-liquid contactor characterized in that a plurality of bubble passage sections surrounding a tube are formed.

The inventors of the present invention have found out that the steady fluctuation of the floss layer in the multi-tube type gas-liquid contactor is caused by the gas jet as described above, and the liquid jet energy is dispersed or absorbed to disperse the liquid. It was discovered that the occurrence of large fluctuations on 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 extremely effectively suppresses the accumulation and superposition of the wave-making energy due to the gas ejection. The present invention has been completed.

The partition member used in the present invention may have a shape capable of substantially partitioning the liquid in the tank by installing a large number of gas introducing pipes suspended in the liquid, one by one or a plurality of gas introducing pipes. . Further, the partition form may be a triangle, a square, a rectangle, a polygon, a circle, a multiple circle, an ellipse, an axle, a radial shape, or a combination thereof. The shape of the partition member may be any shape as long as it can absorb and disperse the gas ejection energy blown from the gas introduction pipe, or can absorb and disperse the wave-making energy near the liquid surface of the liquid tank. Therefore, as the shape of the partition member, in addition to an ordinary flat plate or cylinder, a corrugated plate, a lattice plate, a perforated plate and their cylindrical shape, and those having a wave-eliminating structure such as unevenness attached to their surface, or those It is possible to use a shape having a combination of the above. The material of the partition member may be metal, plastic or ceramic, a composite material or combination material thereof, and a knitted or cloth made of metal or synthetic polymer, or a combination thereof. The partition member is usually installed vertically to the liquid passage in the liquid tank, but it can be installed horizontally or fixed on the liquid surface depending on the shape of the partition member. In this case, it can also serve as a grid-like support that is usually arranged to support the gas introduction pipe. Further, by exposing the partition member on the surface of the floss layer in the liquid tank, it is possible to prevent the motion of the floss layer surface from diffusing to other partition sections, but it may be installed below the surface of the floss layer. That is, even if the upper end of the partition member is installed in the floss layer, if the lower end part of the partition member collides with the gas partition part ejected from the gas introduction pipe, the gas ejection energy is dispersed, so that Stacking is suppressed. Therefore, it is preferable that the vicinity of the lower end portion of the partition member is located below the gas ejection hole of the gas injection pipe, but the partition member partition shape, the number of gas injection pipes to be partitioned, the shape of the partition member or the operation of the gas-liquid contact device. It may be located above the gas ejection holes depending on the conditions.

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

FIG. 1 shows an explanatory view of a bubble passage section formed by partitioning a large number of gas introducing pipes one by one using a partition member, but it is not necessary to partition the gas introducing pipes one by one. It can be divided into multiple pieces. 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. 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 contactor, etc. of the partition member. In addition, the smaller the number of gas introduction pipes partitioned by the partition member, the less likely it is that the wave-forming energy due to gas ejection will be accumulated and superposed, but in addition to the high installation cost, the reaction raw materials (limestone, etc.) and products ( Gypsum) tends to be difficult to diffuse uniformly in the liquid tank. Therefore, in the present invention, a plurality of these gas introduction pipes, for example, 2 to 2 are used.
It is good to partition every 0, preferably every 4 to 40. However, for the reasons described above, it may be possible to carry out a more preferable gas-liquid contact reaction by partitioning every several tens to several hundreds. Further, the number of gas introduction pipes partitioned by the partition member does not necessarily have to be constant throughout the liquid tank.

FIG. 2 shows an explanatory plan view of the inside of the liquid tank including a large number of bubble passage sections formed by partitioning a plurality of gas introduction pipes. In this figure, 10 indicates a liquid tank wall. In the liquid tank of FIG. 2, the plate bodies are arranged vertically and horizontally in the liquid tank, and a large number of bubble passage sections a are formed in the liquid tank, with the partition member 3 having a cylindrical body having a quadrangular cross section as a partition wall. It has a structure. A plurality of gas introduction pipes (not shown) are arranged in each of these compartments a. 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 prescribed in. 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 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 pattern to support the gas introduction pipe. be able to.

In the gas-liquid contacting device of the present invention, when the upper end of the partition member is located below the floss layer upper surface (expanded liquid surface) 5 (see FIG. 1), the floss contained in the liquid tank. The tops of the layers can be connected horizontally. By horizontally connecting the upper part of the floss layer in this way, the flow of the floss layer can be made to flow not only in that one section but also between the other sections, so that the floss layer can be accommodated in the liquid tank. The concentration of the dissolved components contained in the liquid can be made uniform throughout. In this case, the height of the upper end of the partition member from the level of the gas ejection holes 2 is
For the distance between the gas ejection hole 2 and the stationary liquid level 4, 70
It is better to position it to be ~ 130%. Generally, its upper end is at a height from the level of the static liquid level 4,
It is 5 to +10 cm. Further, even when the upper floss layer is connected in the horizontal direction in this manner, a partition wall by a partition member exists near the gas ejection hole, and the flow energy of the liquid given when the gas is ejected from the gas ejection hole is Since the transmission to other parts is prevented, the wave and sway of the floss layer in the liquid tank are calmed down.

[0013]

According to the present invention, since the inside of the liquid tank is constituted of 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 introduction pipe. Of the liquid is temporarily sealed in the compartment, and the wave-making energy of the liquid is much less transferred to other compartments, and as a result, the wave of the floss layer in the liquid tank and Generation of fluctuating floss layer is prevented. In the conventional gas-liquid contact device, each flow of the liquid that occurs when the gas is ejected from the gas ejection holes of each gas introduction pipe into the liquid, and since there is no partition member, they interfere with each other and the floss layer Prone to upset. For this reason, the liquid flows sometimes overlap each other to cause large fluctuations in the floss layer which are steady and periodic as a whole, and the liquid level is changed, which may cause deterioration of gas-liquid contact efficiency. In some cases, it may cause a failure of the equipment in the liquid tank, but in the case of the present invention, as described above, since the inside of the liquid tank is configured with a plurality of bubble passage sections, it is caused by gas ejection. The tangential flow of gas and liquid is
Since it is sealed in this compartment and the transmission to other compartments is prevented, the above-mentioned problems 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, fresh liquid existing below the gas introduction pipe is swept upward in the bubble passage section and mixed with the bubbles in the section. There is an advantage that

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

[0015]

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

Example 1 A test device having a structure in which a total of eight gas introduction pipes are arranged in two rows in the horizontal direction and four rows in the 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 introducing pipe has a hole diameter of 20 to 3 on the peripheral wall surface 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.
A structure having 0 mm holes formed in a horizontal row was used. In addition, the gas injection pipe has a gas ejection hole 1 below the stationary water surface.
It was arranged to have a depth of 0 to 25 cm. In this test device, the inside of the liquid tank was partitioned by a partition plate into two gas introduction pipes to form four bubble passage sections in the liquid tank. In this case, the upper end of the partition plate was positioned at a position above the stationary water surface, and the lower end thereof was positioned at a depth of 30 to 40 cm below the stationary water surface. Water is put into the liquid tank of such a test device as a liquid up to a position of 100 cm in height, and air is supplied to the gas of the gas introducing pipe under the condition that the gas flow rate per gas introducing pipe is 30 to 200 m ³ / hour. Air-water system gas-liquid contact was performed by jetting from the jet outlet. In such gas-liquid contact, repeated and continuous experiments showed that
No significant wave motion occurred in the floss layer in the liquid tank, and the floss layer surface did not substantially fluctuate.

On the other hand, when the same experiment was conducted in the test device without using a partition plate, in this case,
Fluctuation of floss layer surface occurred.

[Brief description of 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 of the inside of a liquid tank including a bubble passage section formed by partitioning a plurality of gas introduction tubes into a plurality of sections using partitioning members.

FIG. 3 is a schematic view showing an example of a conventional gas-liquid contactor used as a flue gas desulfurizer.

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

[Explanation of symbols]

 1, 103 Gas introduction pipe 2, 104 Gas ejection hole 3 Partition member 4 Still liquid surface 5 Fross layer upper surface 6 Floss layer 101 Gas conduit 102 Liquid tank 105 Stirring blade 106 Air introduction pipe a Bubble passing section

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B01D 53/77 B01J 10/00 104 8822-4G B01D 53/34 125 E

Claims (3)

[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, 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 to form a multi-tube gas-liquid contact. apparatus. 2. The gas-liquid contactor according to claim 1, wherein the partition member is vertically installed in the liquid tank so that its lower end is located below the gas ejection hole. 3. The gas-liquid contactor according to claim 1, for carrying out a catalytic reaction between a gas containing an acidic gas and an alkaline liquid.