JP4616142B2 - Gas dispersion pipe for gas-liquid contact, gas-liquid contact method and apparatus using the same, and exhaust gas treatment method and apparatus - Google Patents

Description

The present invention relates to a gas dispersion pipe used for bringing a gas and a liquid (including a slurry) into contact with each other, a gas-liquid contact method and apparatus using the same, and an exhaust gas treatment method and apparatus .

  A large liquid tank contains liquid, and a number of gas dispersion pipes (sparger pipes) having a plurality of gas ejection holes on the lower peripheral wall surface are suspended in the liquid, and gas is supplied from the upper end opening of the gas dispersion pipe. An apparatus that introduces gas into the pipe and jets the gas introduced into the pipe into the liquid from a gas ejection hole formed at the tip of the pipe to make gas-liquid contact is widely known (Patent Documents 1 to 5). 6 etc.).

  The conventional gas dispersion pipe used in such a device has a straight pipe structure in which the inner diameter of the upper end portion and the inner diameter of the lower end portion are the same, and the gas entering the upper end opening of the gas dispersion pipe from the space There is a problem in that useless pressure loss occurs due to rapid reduction.

  In addition, since the conventional gas dispersion pipe has a structure in which the gas is ejected in a horizontal direction from a gas ejection hole provided in the peripheral wall of the lower end portion thereof, in the gas dispersion pipe having such a structure, the inside of the pipe is vertically oriented. The gas flowing down changes its course in the horizontal direction and flows out from the gas ejection hole. Therefore, in the conventional gas dispersion pipe, there is a problem of pressure loss caused by the gas flowing down in the vertical direction changing the course in the horizontal direction. In this case, the pressure loss is further increased when the gas flow rate through the pipe increases or when droplet particles are mixed in the gas.

  Further, in the conventional gas dispersion pipe, the inner peripheral wall of the upper end opening that forms the gas inlet gradually wears due to the collision of droplets and solid fine particles contained in the gas. When this occurs, the conventional gas dispersion pipe needs to be replaced, and there is a problem that much effort, cost and time are required for the replacement.

JP-B 55-37295 Japanese Patent Publication No.57-6375 Japanese Patent Publication No.59-11322 Japanese Patent Publication No. 3-70532 JP-A-3-72913 JP-A-3-262410

  The subject of this invention is as follows.

(1) To provide a gas dispersion pipe for gas-liquid contact having a structure with little pressure loss when gas enters the pipe from the space through the upper end opening.
(2) To provide a gas dispersion pipe for gas-liquid contact having a structure with little pressure loss when the gas introduced into the pipe from the upper end opening is ejected from the gas ejection hole at the lower end.
(3) To provide a gas dispersion pipe for gas-liquid contact having a structure that does not require replacement of the entire pipe even when the inner peripheral wall of the upper end opening is worn.
(4) To provide a gas-liquid contact method using the gas-liquid contact gas dispersion pipe.
(5) To provide a gas-liquid contact device comprising the gas-liquid contact gas dispersion pipe.

  Other objects of the present invention will be understood from the following description.

According to the present invention, the following invention is provided.
(1) A gas dispersion tube for gas-liquid contact in which gas is introduced from the upper end into the pipe and gas is ejected into the liquid from the lower end to make gas-liquid contact, and is directed downward into the pipe at the lower end. The gas guide member whose horizontal cross-sectional area is enlarged is arranged with a space between it and the inner wall surface of the pipe, and the horizontal cross-sectional area is reduced so that the upper end of the gas dispersion pipe is directed downward. And a lower end portion is formed in a nozzle structure in which a horizontal cross-sectional area of a space between the gas guide member and the gas dispersion pipe is reduced toward the lower side, and the lower end portion A gas dispersion tube for gas-liquid contact, characterized in that the jet direction of the gas jetted from the liquid into the liquid is obliquely outward and downward.
(2) The gas dispersion pipe for gas-liquid contact according to (1), wherein the gas guide member is a rotationally symmetric body having an inclined surface whose cross-sectional area increases in a horizontal cut surface downward.
(3) The gas dispersion pipe for gas-liquid contact according to (1) or (2), wherein the gas guide member is fixed by a plate body extending radially from a center line of a hollow tube main body .

( 4 ) In a gas-liquid contact method including a step of blowing gas into a liquid accommodated in a tank through a gas-dispersion gas-dispersing tube suspended in a large number of through holes formed in a partition plate. A gas-liquid contact method using the gas dispersion pipe according to any one of (1) to ( 3 ) as the gas-liquid contact gas dispersion pipe.
( 5 ) In a method for purifying exhaust gas containing pollutants by contacting with an absorbing liquid, (i) a first cleaning step of spraying the absorbing liquid in the form of fine particles into the exhaust gas and bringing the exhaust gas and the absorbing liquid particles into contact with each other; ii) Second purification in which the mixture of exhaust gas and absorption liquid particles obtained in the first purification step is circulated as a gas-liquid mixed phase flow in the gas dispersion pipe, and the exhaust gas and absorption liquid particles are in close contact with each other in the gas dispersion pipe. Step (iii) Absorbing the gas-liquid mixed phase flow of the exhaust gas and the absorbing liquid particles from the second purification step through the tip of the dispersion tube into the absorbing liquid or colliding with the surface of the absorbing liquid A method for treating exhaust gas, comprising: a third purification step for contacting with a liquid, wherein the gas dispersion pipe of any one of (1) to ( 3 ) is used as the gas dispersion pipe.
( 6 ) In a gas-liquid contact apparatus having a structure in which gas is blown into a liquid accommodated in a tank through gas-liquid contact gas dispersion pipes suspended in a large number of through holes formed in a partition plate A gas-liquid contact apparatus using the gas dispersion pipe according to any one of (1) to ( 3 ) as the gas dispersion pipe.
( 7 ) An airtight container whose interior is partitioned into a first chamber and a second chamber adjacent above the first chamber by one partition plate, an exhaust gas inlet disposed on the peripheral wall of the second chamber, A purified exhaust gas outlet disposed on the peripheral wall, an absorbent spray device disposed on the upper portion of the second chamber, a plurality of through holes communicating the first chamber and the second chamber disposed on the partition plate, An exhaust gas treatment apparatus comprising a gas dispersion pipe disposed in the through-hole, wherein the gas dispersion pipe of any one of (1) to ( 3 ) is used as the gas dispersion pipe .
( 8 ) A sealed container, the interior of which is divided into two chambers, the interior of which is divided into a first chamber, a second chamber adjacent above the first chamber, and a third chamber adjacent above the second chamber; An exhaust gas inlet disposed in the peripheral wall of the first chamber, a purified exhaust gas outlet disposed in the peripheral wall of the third chamber, an absorbent spray device disposed in the upper portion of the second chamber, and the first chamber and the second chamber. A large number of through holes communicating with the first chamber and the second chamber disposed in the separating plate, a gas dispersion pipe disposed in the through hole, and a communication tube communicating between the first chamber and the third chamber An exhaust gas treatment apparatus using any one of (1) to ( 3 ) as the gas dispersion pipe.

The gas dispersion pipe of the present invention is suitable as a gas dispersion pipe in a conventionally known gas-liquid contact device. According to the gas dispersion pipe of the present invention, the gas or the gas mixed with the droplet particles flows into the pipe because the upper end of the pipe is formed in a reduced pipe structure whose horizontal cross-sectional area is reduced downward. In addition, pressure loss when circulating in the pipe can be reduced. As a result, the pressure when the gas is pumped into the dispersion tube can be reduced, and the power energy for pressurizing the gas can be saved.

According to the gas dispersion pipe of the present invention, within its lower end, so the structure horizontal cross-sectional area that inserts the gas guide member to expand downward, horizontal gas ejected from the tip of the tube into the absorbing solution Since the spread in the direction and the depth of the gas in the downward direction can be adjusted optimally, the gas-liquid contact efficiency can be improved and the contaminant removal rate can be increased.

  In order to describe the present invention in more detail, the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows an explanatory cross-sectional view of a gas dispersion pipe of a reference example formed in a reduction pipe structure in which the horizontal cross-sectional area is reduced with the upper end portion of the pipe facing downward.

  The gas dispersion pipe shown in FIG. 1 includes a straight pipe part (pipe main body) 2, a contraction pipe part 1 formed on a curved surface in which an inner peripheral surface formed at the upper end of the straight pipe part extends upward and outward, The nozzle portion 7 is formed at the lower end of the straight pipe portion. The inner peripheral surface of the reduced tube portion 1 is preferably formed in an arcuate curved surface. In this case, the radius of curvature R (1) of the inner peripheral curved surface is 1/20 to 1/1 of the inner diameter of the straight tube portion, Preferably, the range is 1/8 to 1/2. The inner peripheral curved surface of the reduction tube portion may be an arcuate curved surface, an elliptical arc curved surface, or other curved surface as long as it smoothly connects to a straight tube and does not cause useless pressure loss. The ratio R (3) / R (2) between the inner diameter R (3) of the tip of the nozzle portion 7 formed at the lower end of the straight pipe portion and the inner diameter R (2) of the straight pipe portion 2 is 0.4. It is -0.8, Preferably it is the range of 0.5-0.75. In the dispersion pipe having the structure shown in FIG. 1, the structure of the lower end thereof is that of the nozzle structure shown in FIG. 1, and a simple gas pipe structure or a gas ejection hole is formed on the peripheral wall surface of the straight pipe. Can be things.

  In the dispersion tube having the structure shown in FIG. 1, it is preferable that the reduction tube portion 1 and the nozzle portion 7 are formed so as to be detachable so that they can be exchanged.

  FIG. 2 shows a structure of a gas dispersion pipe in which a reduction pipe portion formed at the upper end of a straight pipe and a nozzle portion formed at the lower end thereof are formed to be replaceable, and the dispersion pipe is attached to a through hole portion of a partition plate. A state diagram is shown. In this figure, 1 is a reduction tube, 2 is a straight tube, 3 is a reinforcement tube, 4 is a positioning ring, 5 is a cylindrical rubber elastic body, 102 is a partition plate, 7 is a nozzle, and 8 is a positioning reinforcement tube.

  The gas dispersion pipe shown in FIG. 2 generally includes a straight pipe 2, a reduction pipe 1 connected to the upper end of the straight pipe, and a nozzle 7 connected to the lower end of the straight pipe 2.

  The contraction tube 1 is formed in an arcuate curved surface whose inner peripheral surface expands upward and outward. FIG. 3A is a perspective view and FIG. 3B is a partial enlarged view thereof. In FIG. 3, reference numeral 10 denotes an annular vertical hole formed in the vertical direction inside the peripheral wall, and is detachably fitted to the distal end portion of the reinforcing tube 3. Reference numeral 9 denotes an annular groove formed on the outer peripheral wall surface of the annular vertical hole 10, and is fitted to the positioning ring 4.

  The nozzle 7 is formed of a tapered tube, and a perspective view thereof is shown in FIG. In FIG. 4, reference numeral 11 denotes an annular groove formed on the upper inner peripheral wall surface of the nozzle, which is fitted into the positioning ring reinforcing tube 8.

Reinforcing tube 3, the inner diameter is approximately equal has tubular body and the outer diameter of the straight tube portion 2. This is fitted to the outside of the straight pipe 2 so that its upper end is located above the upper end of the straight pipe 2, and is fixedly bonded by an adhesive. An annular groove into which the positioning ring 4 is fitted is formed on the outer peripheral wall surface near the upper end of the reinforcing pipe 3.

  The positioning reinforcing pipe 8 is formed of a short pipe, is fitted to the outside of the lower end portion of the straight pipe 2, and is bonded and fixed with an adhesive.

  The radius of curvature of the arc of the arcuate curved surface forming the inner peripheral surface of the reduction tube 1 is in the range of 1/20 to 1 times the inner diameter of the straight pipe portion, preferably 1/8 to 1/2. Good.

  The diameter of the tip of the nozzle 7 should be 0.4 to 0.8, preferably 0.5 to 0.75, of the inner diameter of the straight pipe 2.

  The material of the reduction tube 1 can be plastic, rubber, or the like, but is preferably rubber having good wear resistance and impact resistance. The material of the straight pipe 2 can be metal, plastic or the like, but is preferably hard plastic. The material of the nozzle 7 can be plastic or rubber, but is preferably wear-resistant rubber. The material of the reinforcing tube 3 can be metal, plastic or the like, but is preferably hard plastic. The material of the positioning reinforcing tube 8 can be metal, plastic, rubber or the like, but is preferably hard plastic.

In order to manufacture the gas dispersion pipe having the structure shown in FIG. 2, the reducing pipe 1 is connected to the upper end of the straight pipe 2 in which the reinforcing pipe 3 and the positioning reinforcing pipe 8 are bonded together in advance, and the lower end thereof. What is necessary is just to connect the nozzle 7 to this. The reduction pipe 1 is connected to the upper end of the straight pipe 2 after the annular positioning ring 4 is fitted into an annular groove formed in the outer peripheral wall surface near the upper end of the reinforcement pipe 3 and then the annular vertical hole of the reduction pipe 1 is connected. 10 and the tip of the reinforcing tube 3 can be combined, and the reduction tube 1 can be pressed. In this way, as shown in FIG. 2, the tip of the reinforcing tube 3 is fitted into the annular vertical hole 10 of the reduction tube 1 and is formed on the inner peripheral wall surface outside the annular vertical hole 10 of the reduction tube 1. A state in which the protruding portion of the positioning ring 4 is fitted in the annular groove 9 is obtained. Further, the reduction tube 1 connected to the upper end of the straight tube 2 in this way can be detached from the upper end of the straight tube 2 by pulling the reduction tube 1 upward as necessary.

  The positioning ring 4 may be an annular ring having a circular or quadrangular cross section, and the material thereof may be metal, plastic, rubber, or the like.

  On the other hand, the nozzle 7 can be connected to the lower end of the straight pipe 2 by aligning the lower end of the straight pipe 2 and the upper end opening of the nozzle 7 and pressing the nozzle 7 upward. In this way, as shown in FIG. 2, a state in which the positioning reinforcing pipe 8 is fitted in the annular groove 11 formed on the inner peripheral wall surface of the upper part of the nozzle is obtained. In addition, the nozzle 7 connected to the lower end of the straight pipe 2 in this way can be detached from the lower end of the straight pipe by pulling the nozzle 7 downward as necessary.

  The method of connecting the reduction tube 1 and the nozzle 7 to the straight tube 2 is not limited to the above method, and in short, any method can be adopted as long as it is a detachable method.

  FIG. 5 shows a state diagram of the gas dispersion pipe shown in FIG. 2 in which a gas dispersion pipe having a lower end portion instead of a nozzle structure and formed in a normal cylindrical structure is attached to a through hole portion of the partition plate. In this figure, reference numeral 15 denotes a gas ejection hole formed in the peripheral wall surface of the lower end portion of the gas dispersion pipe.

The gas dispersion pipe of the reference example shown in FIG. 2 and FIG. 5 has an upper end formed in a reduction pipe structure, so that only the exhaust gas or a mixture of exhaust gas and absorbing liquid particles is circulated through this dispersion pipe. In addition, the flow of the exhaust gas or the mixture is smoothly and gradually reduced in volume along the inner wall surface of the reduction tube without being released from the wall surface of the reduction tube and generating vortices. Generation | occurrence | production can be prevented effectively. Therefore, it is possible to save motive energy required for circulating the exhaust gas or the mixture of the exhaust gas and the absorbing liquid particles in the dispersion pipe.

  Further, in the gas dispersion pipe shown in FIGS. 2 and 5, since the reduction tube forming the upper end portion thereof is detachable, when wear of the reduction tube due to collision with the absorbing liquid particles occurs. This is very convenient because it is not necessary to replace the entire gas dispersion tube, and only the contraction tube needs to be replaced. In the conventional gas dispersion pipe, when it is necessary to replace the upper end of the gas dispersion pipe, the entire gas dispersion pipe has to be replaced, which requires much labor, cost, and time. In the case of a tube, only the reduced tube needs to be replaced, which can save significant labor, cost and time for the replacement.

  In the gas dispersion pipe, as shown in FIG. 2, the lower end portion of the nozzle structure has a nozzle structure because only the exhaust gas or the mixture of the exhaust gas and the absorbing liquid particles goes straight through the pipe. Compared to a gas dispersion pipe having a structure in which gas ejection holes are provided, there is an advantage that less pressure loss occurs. When only exhaust gas or a mixture of exhaust gas and absorbing liquid particles is circulated in a conventional gas dispersion pipe, the exhaust gas or mixture flows down in the vertical direction, and then changes its course direction to the horizontal direction and is provided on the peripheral wall surface. It is ejected from the gas ejection hole into the absorbing liquid. In the dispersion pipe, when only the exhaust gas that goes straight downward or the course direction of the mixture of the exhaust gas and the absorbing liquid is changed in the horizontal direction, the pressure loss in the dispersion pipe increases. In the gas dispersion pipe shown in FIG. 2, since only the exhaust gas flowing through the dispersion pipe or the mixture of the exhaust gas and the absorption liquid goes straight without changing its course, it is blown into the absorption liquid as it is. There is no generation of pressure loss due to the change of the course of the exhaust gas or the mixture as seen in the dispersion pipe of the present invention.

  Furthermore, the gas dispersion pipe having the structure shown in FIG. 2 is very easy to attach to the partition plate because the reduction pipe and the nozzle are detachable.

In FIGS. 6 to 14, the tube portion of the lower end portion of the gas dispersion pipe, the flow of gas pipe main body (straight tube) were provided with a gas guide member for widening obliquely outside the bottom side at the exit of the tube body The example of the gas dispersion pipe of this invention of a structure is shown.

6 to 8 show an embodiment of the gas dispersion pipe of the present invention having a structure in which a gas guide member is disposed inside the lower end pipe.

FIG. 6 is a longitudinal sectional view showing a state in which the gas dispersion pipe 21 according to one embodiment of the present invention is attached to the partition plate 102. 7 is a cross-sectional view taken along the line AA ′ of FIG. 6, and FIG. 8 is a cross-sectional view taken along the line BB ′ of FIG.

  The gas dispersion pipe 21 includes a pipe main body 20 having a hollow inside, and a gas guide member 30 having a horizontal cross-sectional area that increases toward the lower side disposed in an end of the pipe main body 20 on the gas outlet side 25. And. The tube body 20 is a straight straight tube, and its size is about 25 to 250 mm in outer diameter and about 500 to 5000 mm in length.

Gas guide member 30 is installed to spread obliquely outside the bottom side of the gas flow in the tube body 20 at the outlet of the tube body, this compound toward the downstream direction of the gas flow cross-sectional area of the horizontal cutting plane It is a rotationally symmetric body having an inclined surface 31 that gradually increases. More specifically, a rotationally symmetric body such as a cone or a rotating paraboloid, an arbitrary rotationally symmetric body such as a sphere and a lower half portion of a monolobal hyperbolic body can be used.

  The inclination angle θ of the inclined surface provided in such a gas guide member 30 is an angle larger than 0 and smaller than 90 degrees from the horizontal plane (bottom surface), preferably 15 degrees to 75 degrees, more preferably 30 degrees to 60 degrees, Any angle can be selected within these ranges. In the embodiment of FIG. 6, a cone having an inclination angle θ = 60 degrees is illustrated. In this case, a cylinder having the same diameter as the bottom surface of the cone may be connected to the lower surface of the cone for a certain length to protect the cone bottom from abrasion. Further, the bottom surface of the inverted truncated cone-shaped structure having the same bottom surface as the diameter of the cone 30 can be brought into contact with and joined to the bottom surface of the cone 30. By joining such an inverted frustoconical structure below the cone 30, the dead space below the cone 30 is eliminated, and the gas ejected from the gas outflow hole at the lower end of the gas dispersion pipe efficiently contacts the liquid. Can be made.

  As the inclination angle θ of the inclined surface 31 is larger, the downward gas ejection and diffusion is improved. Therefore, this gas dispersion pipe is suitable when the gas processing flow rate per gas dispersion pipe is large. When the gas processing flow rate is large, collisions between the gas flows ejected from adjacent gas dispersion pipes are likely to occur, resulting in poor gas-liquid contact efficiency. However, the gas dispersion pipe of the present invention has such disadvantages. Does not occur. It is preferable to select the optimum gas ejection direction by appropriately changing the inclination angle θ of the inclined surface 31 or the shape of the rotationally symmetric body according to the gas processing flow rate.

  The opening cross-sectional area at the gas outlet end of the tube body 20 is 20 to 80%, more preferably 30 to 75% of the cross-sectional area of the hollow tube body 20 by the insertion of the gas guide member 30. Is set to be By setting in this way, the gas ejected from the gas outlet end of the tube main body 20 has a gas flow rate faster than the gas flow rate of the straight pipe portion of the tube main body 20, and good gas-liquid contact in the liquid is obtained. It is done.

  The gas guide member 30 can be fixed by, for example, a plate body 40 extending radially from the center line of the hollow tube body 20. The number of fixing plate bodies 40 is normally 4 to 32 assuming a plate body 40 having a length from the center line of the tube main body 20 to the tube wall as shown in the figure. Any number can be selected in consideration of various strengths. Moreover, the thickness at the gas jet port of the plate body 40 is preferably 5 mm or more so that the gas jetted from the adjacent jet port does not collide. Except for the vicinity of the spout, the thickness of the plate 40 may not be constant. For example, the thickness of the plate may be changed depending on the position so that the gas flow line indicated by the arrow becomes smooth, Further, the length along the axial direction may be arbitrary.

  As described above, the gas dispersion pipe 21 shown in FIG. 6 basically includes the pipe main body 20 and the gas guide member 30 disposed inside one end portion thereof. It is fixed by the plate body 40. The material of the gas guide member and the plate is made of metal, plastic or the like, and is preferably hard plastic. The gas guide member 30 and the plate body 40 may be integrally formed by injection molding, or may be individually produced and bonded. Further, the plate body 40 may penetrate and be fixed to the pipe body 20 and the gas guide member 30.

  In the gas dispersion pipe 21 shown in FIG. 6, the lower end face 25a of the pipe body 20 and the bottom face 32 of the conical gas guide member 30 are formed so as to be on the same horizontal plane.

Next, FIGS. 9 to 11 show another embodiment of the gas dispersion pipe of the present invention having a structure in which a gas guide member is disposed inside the lower end portion.

  The gas dispersion pipe 22 shown in FIGS. 9 to 11 is different from the gas dispersion pipe 21 of the above-described embodiment in the shape and arrangement of the gas guide member. That is, in the gas dispersion pipe 22 of this embodiment, the bottom surface 37 of the gas guide member 30 ′ protrudes outward from the lower end 25a of the tube body 20, and in this case, the diameter of the bottom surface 37 of the gas guide member 30 ′ is the tube body. It is set to be equal to the outer diameter of 20. These do not need to be set to be exactly the same, and the diameter of the bottom surface 37 of the gas guide member 30 ′ may be set within a range of ± 20% with respect to the outer diameter of the pipe body 20. The distance by which the bottom surface 37 of the gas guide member 30 ′ protrudes outward from the lower end 25 a of the tube body 20 is appropriately determined in consideration of the obstacle to the turbulent diffusion of the absorbing liquid by the bottom surface 37.

  In the case of this embodiment, the inclination angle θ of the inclined surface 36 of the gas guide member 30 ′ illustrated as a cone is set to 45 degrees, but is arbitrary within the same range as described in the above embodiment. You can choose the angle. Since the smaller the angle θ, the better the gas diffusion in the horizontal direction, the gas dispersion pipe of this embodiment is suitable when the gas processing flow rate per gas dispersion pipe is small. Also in this case, the optimum gas ejection direction can be selected by changing the inclination angle θ of the inclined surface of the gas guide member 30 ′ or the shape of the rotationally symmetric body according to the gas processing flow rate.

  Further, the opening cross-sectional area at the gas outlet end of the pipe body 20, that is, the section where the opening cross-sectional area surrounded by the lower end portion 25a of the pipe main body 20 and the inclined surface 36 of the gas guide member 30 ′ is minimized. The area is set to 20 to 80%, more preferably 30 to 75% of the cross-sectional area of the tube body 20. As a result, the processing gas can be ejected into the liquid at a gas flow rate faster than the gas flow rate of the straight pipe portion of the tube body 20, and a good gas-liquid contact state can be obtained.

  The gas processing flow rate per gas dispersion pipe is determined by the diameter of the gas dispersion pipe, the concentration of pollutants to be removed such as sulfurous acid gas and dust contained in the gas, the removal rate of pollutants, and the economy. However, as is apparent from the above description, the present invention has a great merit that the optimum gas ejection direction and ejection speed can be appropriately selected according to the gas processing flow rate per gas dispersion pipe. This is, of course, a gas dispersion tube for gas-liquid contact that can respond to a wide range of changes in the processing gas volume, that is, it can be applied over a wide range from a relatively large processing gas volume to a relatively small processing gas volume. This means that a gas dispersion tube for gas-liquid contact can be provided.

12 to 14 show still another embodiment of the gas dispersion pipe of the present invention having a structure in which a gas guide member is disposed inside the lower end pipe. In these drawings, as the gas guide member, a hemispherical rotationally symmetric body 30 ″ is shown. In this case, the inclination angle θ of the rotationally symmetric body 30 ″ is 90 degrees.

  6 to 14, the upper end portion of the gas dispersion pipe is shown as a straight pipe structure. However, as shown in FIGS. It is preferable to form a reduced tube structure whose horizontal cross-sectional area is reduced.

  In FIG. 15, the schematic diagram about one example of the gas-liquid contact apparatus provided with the gas dispersion pipe | tube of this invention is shown. This apparatus is suitable as an exhaust gas treatment apparatus for removing sulfurous acid gas from exhaust gas containing sulfurous acid gas. In FIG. 15, 101 is a sealed container, 102 is a partition plate, 103 is a second chamber, 104 is a first chamber, 105 is an exhaust gas inlet, 106 is a gas dispersion pipe, 107 is an absorption liquid circulation pump, and 108 is an absorption liquid circulation line. , 109 is an absorbing liquid spray device, 110 is a purified exhaust gas outlet, 111 is a gas-liquid interface, 112 is an absorbing liquid supply line, 113 is an oxidizing air supply line, 114 is an absorbing liquid stirrer, and 115 is absorbing from the first chamber. A liquid discharge line 118 indicates a floating substance extraction line.

  The entire apparatus shown in FIG. 15 is composed of a large sealed container, and the inside of the container is partitioned into a first chamber 104 and a second chamber 103 adjacent thereto above by a partition plate 102. A large number of through holes are provided in the partition plate 102, and an exhaust gas dispersion pipe 106 is provided in each of these through holes. The partition plate 102 may be horizontal, stepped, or slightly inclined. The horizontal cross-sectional shape of the container 101 can be circular or rectangular.

The second chamber 103 is provided with a spray device 109 as an absorbing liquid dispersing means in the upper part thereof. Further, an exhaust gas inlet 105 is disposed on the peripheral wall of the second chamber 103. The shape of the second chamber is preferably hemispherical when the first chamber is cylindrical because the volume is minimized and the container material cost is minimized. When the first chamber is rectangular it is desirable to the second chamber to the obelisk shape.

  In the first chamber 104, the absorbing liquid L is accommodated. A purified exhaust gas outlet 110 is disposed on the upper peripheral wall.

  Between the first chamber 104 and the spray device 109, a circulation line 108 for circulating the absorbing liquid in the first chamber to the spray device 109 in the second chamber is disposed, and a circulation pump 107 is provided in the circulation line. Is attached. When the exhaust gas entering the second chamber is cooled in advance by contact with cooling water, the spray device 109 and the absorption liquid circulation line 108 are not necessarily provided.

  In FIG. 15, reference numeral 112 denotes an absorption liquid supply line, 115 denotes an absorption liquid extraction line from the first chamber, 118 denotes a suspended substance extraction line, and 114 denotes an agitator for stirring the absorption liquid. Reference numeral 113 denotes an oxygen or oxygen-containing gas supply line used when oxygen is supplied into the absorption liquid.

  In order to purify the exhaust gas using the apparatus shown in FIG. 15, the absorption liquid L accommodated in the first chamber 104 is sprayed into the second chamber 103 via the circulation line 108 provided with the circulation pump 107. It is sent to the device 109 and sprayed uniformly into the second chamber 103 from here, and exhaust gas is supplied from the inlet 105 into the second chamber 103 where the absorbing liquid is sprayed. The temperature of the exhaust gas can usually be in the range of 80-300 ° C. The exhaust gas supplied into the second chamber 103 is mixed and contacted with absorbing liquid particles (average particle size: 200 to 4000 μm) formed by spraying the absorbing liquid here. As a result, the exhaust gas is cooled to lower its temperature, and gaseous chemical pollutants and solid particulates (for example, dust) (hereinafter also simply referred to as pollutants) contained in the exhaust gas are Then, it is captured by the absorbing liquid particles and removed from the exhaust gas. A part of the absorbing liquid sprayed in the second chamber 103 stays on the partition plate 102, but this staying absorbing liquid flows into the gas dispersion pipe 106 to form a gas-liquid mixed phase flow.

  When a part of the absorption liquid stored in the first chamber 104 is circulated to the spray device 109 via the circulation line 108, the absorption liquid extracted from the first chamber can be circulated as it is to the spray device 109. In addition, makeup water or a new absorbent can be added to the absorbent to improve the performance of the absorbent and then circulated through the spray device. Further, when the absorbent is an absorbent slurry and the solid content concentration is high, the solid content can be removed beforehand by filtration, centrifugation, etc., and then circulated to the spray device.

The amount of the absorbing liquid sprayed from the spray device 109 is usually 0.2 to 10 kg / hr, preferably 0.5 to 5 kg / hr per 1 m ³ / hr of the exhaust gas supply amount converted to the standard state. By spraying such an absorption liquid amount, the exhaust gas can be cooled to a temperature below the dew point of the exhaust gas. In this case, the cooling of the exhaust gas is achieved by the contact between the exhaust gas and the absorbing liquid particles and the heat of vaporization when a part of the liquid in the absorbing liquid particles evaporates. Moreover, removal of about 20% by weight or more of the pollutants contained in the exhaust gas is achieved by the mixed contact between the exhaust gas and the absorbing liquid particles.

  The mixture of the exhaust gas and the absorbing liquid particles formed in the second chamber 103 is distributed to the gas dispersion pipe 106 disposed in the through hole of the partition plate 102, and circulates in the dispersion pipe as a gas-liquid mixed phase flow. It is blown into the absorption liquid in the first chamber 104 and is again brought into contact with the absorption liquid.

  When the mixture of the exhaust gas and the absorbing liquid particles flows into the dispersion pipe 106 from the second chamber 103 and flows through the dispersion pipe 106, the relative velocity between the gas and the liquid increases, and the contact between the exhaust gas and the absorbing liquid particles also increases. It will be close. From this point, it is preferable that the flow rate of the exhaust gas passing through the dispersion pipe is larger.

The flow rate of the exhaust gas passing through the dispersion pipe 106 is adjusted by the number of through holes provided in the partition plate 102, the inner diameter of the dispersion pipe provided in the through holes, the amount of exhaust gas supplied to the second chamber, the pressure thereof, and the like. be able to. In the case of the present invention, the flow rate of the exhaust gas flowing through the dispersion pipe is 10 m / second or more, preferably 15 m / second or more, based on the linear velocity based on the pipe cross-sectional area. The ratio of the absorption liquid particles in the mixture flowing through the dispersion pipe, the amount of exhaust gas is converted to standard state 1 m ³ per, 0.2～10Kg, preferably from 0.5 to 5 kg. The ratio of the absorbing liquid particles contained in the exhaust gas can be controlled by the amount of absorbing liquid sprayed from the spray device 109, the amount of exhaust gas supplied to the second chamber 103, and the like.

  As described above, exhaust gas is allowed to flow through the dispersion pipe at a high speed in the form of a mixture with absorbing liquid particles, whereby intimate contact between the exhaust gas and absorbing liquid particles is obtained, and the gaseous state contained in the exhaust gas is obtained. Contaminants and solid particulates are captured by the absorbing liquid particles and removed from the exhaust gas. In the case of the present invention, the percentage of contaminants removed in this dispersion tube is at least 20% of the total contaminant removal by the device.

  The exhaust gas blown into the absorption liquid L through the tip of the gas dispersion pipe 106 rises in the absorption liquid in the form of bubbles, and during that time contaminants and solid fine particles remaining in the exhaust gas are captured by the absorption liquid. Removed from inside. In this way, the purified exhaust gas from which contaminants and solid particulates have been removed is dissipated from the gas-liquid interface 111 into the space above it, and is discharged from the container through the outlet 110 from here.

When a mixture of exhaust gas and absorbing liquid particles is blown into the absorbing liquid as a gas-liquid mixed phase flow from the tip of the gas dispersion pipe 106, the tip of the dispersion pipe is placed in the pipe at the tip as shown in FIGS. It is preferable that the gas-liquid mixed phase flow is blown into the absorbing liquid at a high speed by disposing the gas guiding member. When the gas-liquid mixed phase flow is blown into the absorption liquid at a high speed from the tip of the dispersion pipe, the gas-liquid mixed phase flow has a higher density than the gas flow, and therefore has the advantage of reaching deeply into the absorption liquid. . That is, in this case, a higher contaminant removal rate can be obtained under the same pressure loss condition than in the case of conventional exhaust gas treatment. Further, when a gas-liquid mixed phase flow is blown into the absorbing liquid at a high speed, it is possible to prevent the occurrence of a large flow (sloshing) of the absorbing liquid surface. The speed of the gas-liquid mixed phase flow can be controlled by the sectional area of the opening through which the gas flows out from the tip of the dispersion pipe. In the present invention, the speed of the exhaust gas in the gas-liquid multiphase flow that flows out from the distal end of the dispersion pipe during the maximum treatment of the exhaust gas is preferably maintained at a high speed of 25 m / second or more, preferably 30 m / second or more. The flow rate of the exhaust gas is a flow rate based on the outflow opening cross-sectional area at the tip of the gas dispersion pipe.

  In FIG. 15, the purified exhaust gas separated from the absorbing liquid L through the gas-liquid interface 111 is discharged out of the container from the outlet 110 disposed on the peripheral wall of the first chamber 104. A third chamber is provided adjacent to the upper side of the second chamber 103, and the first chamber and the third chamber are connected to each other through a communication pipe, and purified exhaust gas is introduced from the first chamber to the third chamber. It can also be discharged out of the container. A schematic diagram of the apparatus in this case is shown in FIG.

  In FIG. 16, 121 is a third chamber, 122 is a partition that separates the second chamber and the third chamber, and can have a horizontal or arbitrary gradient or bend. A communication pipe 123 connects the first chamber and the third chamber. Also, in the reference numerals shown in FIG. 16, the same reference numerals as those shown in FIG. In the present invention, the absorbing liquid can be sprayed in the third chamber as necessary. In this case, the mixture of the absorbing liquid particles and the exhaust gas is discharged from the outlet 110 provided in the third chamber. The discharged mixture is introduced into a mist separator (not shown) and absorbed here. Liquid particles are removed. Then, the purified exhaust gas from which the absorbing liquid particles have been removed is released to the atmosphere.

  In the above-described treatment of exhaust gas, the exhaust gas is first purified by contact with a relatively large amount of absorption liquid sprayed in the form of particles (first purification step), and then absorbed liquid particles in the gas dispersion pipe. Is purified by the intimate contact (second purification step), and finally, is blown into the absorption liquid and is contacted with the absorption liquid in a bubble state to be purified (third purification process). In such exhaust gas treatment, since the contaminant removal rate in the first purification step and the second purification step is high, depending on the type of exhaust gas, the first purification step and the second purification step are already almost desired. Of pollutant removal rates may be achieved. In such a case, since the removal rate of pollutants from the exhaust gas in the third purification process may be low, the amount of absorption liquid used may be small and the scale of the first chamber may be small. The overall size of the apparatus can be reduced. Further, in such a case, the tip of the gas dispersion pipe is positioned shallowly (for example, 0 to 10 cm) in the absorbing liquid or positioned above the surface of the absorbing liquid (for example, 0 to 30 cm above). Can be made. When the tip of the dispersion pipe is positioned above the surface of the absorption liquid, the multiphase flow of the exhaust gas flowing out from the tip of the dispersion pipe and the absorption liquid particles collides with the surface of the absorption liquid, and the absorption contained in the multiphase flow The liquid particles are taken into the absorbent. On the other hand, the exhaust gas comes into contact with the absorption liquid on the surface portion by collision with the surface of the absorption liquid, and is purified by this contact. When the tip of the gas dispersion pipe is at a position where the absorption liquid is shallow or above the absorption liquid surface, the pressure required to circulate the dispersion pipe is very small.

The absorbent used in the present invention is appropriately selected according to the type of exhaust gas, and various conventionally known ones are used. As the absorbing liquid, for example, pollutants in the exhaust gas are acidic substances such as SO ₂ , SO ₃ , NO, N ₂ O ₃ , NO ₂ , N ₂ O ₄ , N ₂ O ₅ , CO ₂ , HCl, and HF. In some cases, a solution or slurry containing an alkaline substance such as an alkali metal compound or an alkaline earth metal compound is used, and a calcium hydroxide slurry or a calcium carbonate slurry is particularly preferably used. When calcium carbonate slurry or calcium hydroxide slurry is used as the absorbent, these calcium compounds react with sulfite gas to form calcium sulfite. In this case, by introducing air or oxygen into the absorbent. Calcium sulfite can be converted to calcium sulfate. Further, when the pollutant in the exhaust gas is an alkaline substance such as ammonia, an acidic aqueous solution may be used as the absorbing liquid.

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

(Reference Example 1)
An exhaust gas treatment experiment was performed using a gas-liquid contact device (gas treatment device) having a two-chamber structure shown in FIG. As the airtight container 101, the first chamber was cylindrical and the second chamber was hemispherical. As the target exhaust gas, a coal boiler exhaust gas having a temperature of 120 ° C. containing 500 mg / Nm ³ of dust and 2000 volppm of sulfurous acid gas was used. As the absorbing liquid, a slurry liquid containing calcium carbonate was used. As the gas dispersion pipe 106, the one having the structure shown in FIG. 2 was used. In this case, the inner diameter of the straight pipe 2 was 150 mm, and the inner peripheral surface of the reduction pipe 1 was formed into an arcuate curved surface having a curvature radius of 25 mm. The inner diameter of the nozzle 7 was 105 mm. The number of gas dispersion pipes arranged was 11 per 1 m ^{2 of} the partition plate 102. The main operating conditions in the exhaust gas treatment are shown below.

(1) Exhaust gas supply amount at the exhaust gas inlet 105: 100,000 Nm ³ / h
(2) Spray amount of absorbing liquid from the spray device 109: 200 t / h
(3) Exhaust gas cooling temperature in second chamber 103: 48 ° C. (exhaust gas dew point temperature)
(4) Gas linear velocity in the gas-liquid multiphase flow in the straight pipe section 2 (see FIG. 2) of the dispersion pipe: 20 m / sec (5) Absorbed liquid amount in the multiphase flow: 2 kg per 1 Nm ^{3 of} exhaust gas
(6) Linear velocity of the gas-liquid multiphase gas flowing out from the nozzle 7 (see FIG. 2) of the dispersion pipe: about 40 m / sec (7) Absorbed liquid supply amount from the line 112: 11 t / h
(8) Absorption liquid extraction from line 115: 7 t / h
(9) Air supply amount from the line 113: 2300 Nm ³ / h
(10) Gas properties at the purified exhaust gas outlet 110 (i) Sulfurous acid gas concentration: 95 volppm
(Ii) Dust amount: 10 mg / Nm ³

(Reference Example 2)
In Reference Example 1, an exhaust gas treatment experiment was performed in the same manner except that the gas dispersion pipe having the structure shown in FIG. In the gas dispersion pipe, the inner diameter of the straight pipe 2 is 150 mm, the inner peripheral surface of the reduced tube 1 is an arc curved surface of curvature radius of 25 mm, the diameter of the gas ejection holes 15 is 34 mm, the ejection hole The number is twelve.

In the experiment, the linear velocity of the gas-liquid multiphase flow ejected from the gas ejection hole 15 at the lower end of the dispersion pipe is about 32 m / second, and the concentration of sulfurous acid gas and the amount of dust in the purified exhaust gas are 93 volppm and 12 mg / second, respectively. Nm ³ .

(Example 1)
In Reference Example 1, an experiment was performed in the same manner except that the gas dispersion pipe (21) having the structure shown in FIG. In this dispersion tube, the tube body 20 has an inner diameter of about 100 mm and a length of 3000 mm. The gas guide member 30 inserted into the pipe at the gas outlet end of the pipe body 20 has a conical shape, the angle θ of the inclined surface 31 is 60 degrees, and the gas outlet hole at the gas outlet end of the pipe body is cut off. The area was 50% of the cross-sectional area of the hollow tube main body 20. The number of gas dispersion pipes 106 is 16 per 1 m ^{2 of the} partition plate 102.

The main operating conditions in the exhaust gas treatment are the exhaust gas supply amount at the exhaust gas inlet 105: 100,000 Nm ³ / h, the spray amount of the absorbing liquid from the spray device 109: 100 t / h, and the exhaust gas supply in the second chamber 103 Cooling temperature: 48 ° C. (dew point temperature of exhaust gas), gas linear velocity in a gas-liquid multiphase flow in the straight pipe portion of the gas dispersion pipe 106: 18 m / sec, amount of absorbed liquid in the multiphase flow: exhaust gas 1 kg per 1 Nm ³ , gas linear velocity in the gas-liquid multiphase flow flowing out from the outlet of the gas dispersion pipe 106 (21): about 36 m / sec, absorption liquid supply amount from the absorption liquid supply line 112: 11 t / h, absorption The absorption liquid extraction amount from the liquid discharge line 115 was 7 t / h, and the air supply amount from the oxygen or oxygen-containing gas supply line 113 was 2300 Nm ³ / h.
As a result of this experiment, the concentration of sulfurous acid gas at the purified exhaust gas outlet 110 was 95 ppm (vol), and the amount of dust was 10 mg / Nm ³ .

(Comparative Example 1)
In Example 1 , the gas guide member 30 inserted into the gas outlet end portion of the tube body 20 was removed. Otherwise, the experiment was performed under the same conditions as in Example 1 . As a result, the concentration of sulfurous acid gas at the purified exhaust gas outlet 110 was 225 ppm (vol), and the amount of dust was 50 mg / Nm ³ .

(Example 2)
In Example 1 , the structure of the gas guide member 30 and the exhaust gas supply amount were changed. That is, the gas guide member 30 has a conical shape, the angle θ of the inclined surface 31 is 75 degrees, and the cross-sectional area of the gas outflow hole at the gas outlet end of the tube body is 55 of the cross-sectional area of the tube body of the hollow body. %. The exhaust gas supply amount was set to 120,000 Nm ³ / h.

As a result of this experiment, the concentration of sulfurous acid gas at the purified exhaust gas outlet 110 was 95 ppm (vol), and the amount of dust was 10 mg / Nm ³ .

(Comparative Example 2)
In Example 2 , the gas guide member 30 inserted into the pipe at the gas outlet end of the pipe body 20 was removed. Otherwise, the experiment was performed under the same conditions as in Example 2 above. As a result, the concentration of sulfurous acid gas at the purified exhaust gas outlet 110 was 260 ppm (vol), and the amount of dust was 60 mg / Nm ³ .

(Example 3)
In Example 1 , the structure of the gas guide member 30 and the exhaust gas supply amount were changed. That is, the gas guide member 30 has a conical shape, the angle θ of the inclined surface 31 is 60 degrees, and the cross-sectional area of the gas outflow hole at the outlet end of the tube body is 45% of the cross-sectional area of the tube body of the hollow body. It was. The exhaust gas supply amount was 80000 Nm ³ / h.

As a result of this experiment, the concentration of sulfurous acid gas at the purified exhaust gas outlet 110 was 95 ppm (vol), and the amount of dust was 8 mg / Nm ³ .

(Comparative Example 3)
In Example 3 above, the gas guide member 30 inserted into the gas outlet end portion of the tube body 20 was removed. Otherwise, the experiment was performed under the same conditions as in Example 3 above.

As a result, the concentration of sulfurous acid gas at the purified exhaust gas outlet 110 was 190 ppm (vol), and the amount of dust was 40 mg / Nm ³ .

Example 4
In the first embodiment, the structure and arrangement of the gas guide member 30 are changed as shown in FIG. That is, the gas guide member 30 ′ has a conical shape, the angle θ of the inclined surface 31 is 45 degrees, and the cross-sectional area of the gas outflow hole at the gas outlet end of the tube main body is the cross-sectional area of the tube main body of the hollow body. 50%. The distance between the lower end surface of the tube main body 20 and the cone bottom surface (projection distance of the cone bottom surface) was about 16 mm. Otherwise, the experiment was performed under the same conditions as in Example 1 . As a result, the concentration of sulfurous acid at the purified exhaust gas outlet 110 was 100 ppm (vol), and the amount of dust was 10 mg / Nm ³ .

FIG. 1 shows an explanatory view of a gas dispersion pipe in which the upper end portion of the pipe is formed in a reduction pipe structure whose horizontal cross-sectional area is reduced downward. FIG. 2 is an explanatory view of a gas dispersion pipe in which the upper end portion of the pipe is formed in a reduction pipe structure whose horizontal cross-sectional area is reduced downward. FIG. 3 shows an explanatory view of a gas dispersion pipe in which the upper end portion of the pipe is formed in a reduction pipe structure whose horizontal cross-sectional area is reduced downward. FIG. 4 shows an explanatory view of a gas dispersion pipe in which the upper end portion of the pipe is formed in a reduction pipe structure whose horizontal cross-sectional area is reduced downward. FIG. 5 shows an explanatory view of a gas dispersion pipe in which the upper end portion of the pipe is formed in a reduction pipe structure whose horizontal cross-sectional area is reduced downward. FIG. 6 is an explanatory diagram of a gas dispersion pipe having a structure in which a gas guide member whose horizontal cross-sectional area expands downward is arranged in the pipe at the lower end. FIG. 7 shows an explanatory view of a gas dispersion pipe having a structure in which a gas guide member whose horizontal cross-sectional area expands downward is arranged in the pipe at the lower end. FIG. 8 is an explanatory view of a gas dispersion pipe having a structure in which a gas guide member whose horizontal cross-sectional area expands downward is arranged in the pipe at the lower end. FIG. 9 is an explanatory view of a gas dispersion pipe having a structure in which a gas guide member whose horizontal cross-sectional area expands downward is arranged in the pipe at the lower end. FIG. 10 is an explanatory view of a gas dispersion pipe having a structure in which a gas guide member whose horizontal cross-sectional area expands downward is arranged in the pipe at the lower end. FIG. 11 is an explanatory diagram of a gas dispersion pipe having a structure in which a gas guide member whose horizontal cross-sectional area expands downward is arranged in the pipe at the lower end. FIG. 12 shows an explanatory view of a gas dispersion pipe having a structure in which a gas guide member whose horizontal cross-sectional area expands downward is arranged in the pipe at the lower end. FIG. 13 shows an explanatory view of a gas dispersion pipe having a structure in which a gas guide member whose horizontal cross-sectional area expands downward is arranged in the pipe at the lower end. FIG. 14 is an explanatory view of a gas dispersion pipe having a structure in which a gas guide member whose horizontal cross-sectional area expands downward is arranged in the pipe at the lower end. FIG. 15 is an explanatory view of a gas-liquid contact device provided with the gas dispersion pipe of the present invention. FIG. 16 shows an explanatory view of a gas-liquid contact device provided with the gas dispersion pipe of the present invention.

Claims (8)

A gas dispersion tube for gas-liquid contact, in which gas is introduced into the pipe from the upper end and gas is injected into the liquid from the lower end to make gas-liquid contact. A gas reduction member having a structure in which a gas guide member having an enlarged area is arranged with a space between the inner wall surface of the pipe, and the upper end portion of the gas dispersion pipe has a horizontal cross-sectional area that decreases in the downward direction. And a lower end portion is formed in a nozzle structure in which a horizontal cross-sectional area of a space between the gas guide member and the gas dispersion pipe decreases toward the lower side. A gas dispersion pipe for gas-liquid contact, characterized in that the jetting direction of the gas jetted in is obliquely outward and downward. The gas dispersion pipe for gas-liquid contact according to claim 1, wherein the gas guide member is a rotationally symmetric body having an inclined surface whose cross-sectional area increases in a horizontal cut surface downward. The gas-liquid contact gas dispersion pipe according to claim 1 or 2, wherein the gas guide member is fixed by a plate body extending radially from a center line of a hollow tube main body. In the gas-liquid contact method, the method includes a step of blowing gas into the liquid accommodated in the tank through the gas-dispersion gas dispersion pipes suspended in a large number of through holes formed in the partition plate. A gas-liquid contact method using the gas dispersion pipe according to any one of claims 1 to 3 as a gas dispersion pipe for liquid contact. In a method for purifying exhaust gas containing pollutants by contacting with an absorbing liquid, (i) a first cleaning step in which the absorbing liquid is sprayed into the exhaust gas in the form of fine particles, and the exhaust gas and the absorbing liquid particles are contacted, (ii) A second purification step in which the mixture of the exhaust gas and the absorption liquid particles obtained in the first purification step is circulated as a gas-liquid mixed phase flow in the gas dispersion pipe, and the exhaust gas and the absorption liquid particles are in close contact with each other in the gas dispersion pipe; iii) The gas-liquid mixed phase flow of the exhaust gas and the absorbing liquid particles from the second purification step is blown into the absorbing liquid through the tip of the dispersion tube or collides with the surface of the absorbing liquid to come into contact with the absorbing liquid. A method for treating exhaust gas, comprising: a third purification step, wherein the gas dispersion pipe according to any one of claims 1 to 3 is used as the gas dispersion pipe. In a gas-liquid contact apparatus having a structure in which gas is blown into a liquid accommodated in a tank through a gas-dispersion gas-dispersing tube suspended in a large number of through holes formed in a partition plate. as dispersion tube, gas-liquid contact apparatus which is characterized by using any of the gas dispersion pipe according to claim 1-3. An airtight container, the interior of which is partitioned into a first chamber and a second chamber adjacent above it by a single partition plate, an exhaust gas inlet disposed in the peripheral wall of the second chamber, and a peripheral wall of the first chamber A purified exhaust gas outlet, an absorbent spray device disposed in the upper part of the second chamber, a plurality of through holes communicating with the first chamber and the second chamber disposed in the partition plate, and the through holes; An exhaust gas treatment apparatus comprising a gas dispersion pipe disposed therein, wherein the gas dispersion pipe according to any one of claims 1 to 3 is used as the gas dispersion pipe. The inside of the first container, the second chamber adjacent to the upper side of the first chamber, and the third chamber adjacent to the upper side of the second chamber, and the peripheral wall of the second chamber. The disposed exhaust gas inlet, the purified exhaust gas outlet disposed on the peripheral wall of the third chamber, the absorbent spray device disposed in the upper portion of the second chamber, and the space separating the first chamber and the second chamber A plurality of through holes communicating between the first chamber and the second chamber disposed on the plate, a gas dispersion pipe disposed in the through hole, and a communication tube communicating between the first chamber and the third chamber were provided. An exhaust gas treatment apparatus using the gas dispersion pipe according to any one of claims 1 to 3 as the gas dispersion pipe.

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