MXPA98004032A - Gas-liqu contact apparatus - Google Patents

Abstract

The present invention relates to a gas-liquid contact apparatus for the desulphurisation and other treatment of a combustion gas comprising: an absorption tower through which the combustion gas flows, a fluid container external to said combustion gas. tower, and an absorbent fluid feed line in fluid communication with said container and said absorption tower, and wherein said fluid container has a fluid level at or above which the absorbent fluid is maintained; arranged above said absorbent tower below said fluid level, of which an absorbent fluid, stored in said fluid container, is thrown outward in a combustion gas, an inlet disposed in the lower part of said absorption tower for introducing the combustion gas into said absorption tower, from which said combustion gas is introduced at the same time as said nozzles said absorbent fluid and from which said combustion gas flows upwards through said absorption tower; receiving means disposed in a position that is above said fluid level, whereby said receiving means receives at least a part of said fluid. of the absorbing fluid thrown from the nozzles, a circulation passage in fluid communication with said receiving means and said fluid container, from which fluid that is received by said receiving means is returned to said fluid container; The upper part of said absorption tower contains an elongated transversal sectional area, wherein said circulation passage comprises a circulation tube protected from the atmosphere, and wherein said circulation tube has a lower end that extends downwards and is submerged in the absorbent fluid that is inside said fluid container and an air tube connected to said circulation tube so that the air is supplied to the absorbent fluid that is inside said fluid container, simultaneously with the return of the fluid absorbed

Description

GAS CONTACT APPARATUS - LIQUID FIELD OF THE INVENTION AND DECLARATION OF THE RELATED ART This invention relates to a gas-liquid contact apparatus for use, for example, in desalination and other treatments of combustion gases in which an absorbent fluid is poured into a liquid. absorption tower through which the combustion gas flows, and thus leads to a gas-liquid contact with the combustion gas. Conventionally, different types of gas-liquid contact apparatuses are used as the wet flue gas desulfurizers to remove harmful substances (eg, sulfur dioxide) from the combustion gas of a boiler operated with coal or the like. As an example of this gas contact apparatus - liquid mentioned, an apparatus of the type referred to as a "liquid column" is presented in Japanese Open Service Model Number 53828 / '84). In this apparatus, an absorbent fluid (for example, milk of lime) is poured upwards in the form of liquid columns from a variety of nozzles arranged in the absorption tower, and combustion gas is made to flow through these discharged streams of water. absorption fluid. In this way, the sulfur dioxide and dust (eg, ash dust) contained in the combustion gas can be effectively removed. The basic construction of the above is such that, as systematically illustrated in Figure 5, the inlet or outlet sections of the combustion gas 52 and 53 for introducing or discharging the combustion gas are defined in the upper and lower parts of a absorption tower 51. At the same time, pipes of the head 54 are placed in the absorption tower 51 and a large number of nozzles with the front part upwards 55 are formed in these pipes of the head 54. In addition, a storage tank is defined. fluids 56 for storing and absorbing the fluid (e.g., the lime milk) 57 at the bottom of the absorption tower 51. This fluid reservoir 56 communicates with the above-mentioned head pipes 54 by means of a piping circulation 58, and an injection pump 59 is installed in this circulation pipe 58. In the gas-liquid contact apparatus possessing the aforementioned construction, the pump 59, is driven to pouring the absorbent fluid 57 upwards from the upper nozzles 55. On the other hand, the combustion gas is introduced from one of the inlet or outlet sections of the combustion gas 52 and 53 and is flowed through the discharged streams of the combustion gas. absorbent fluid 57, in such a way that gas-liquid contact is achieved. The treated combustion gas from which the sulfur dioxide and similar compounds have been removed is discharged from the other inlet or outlet section of the combustion gas 52 and 53. According to this technique in which the absorbent fluid 57 is poured upwards, the gas-liquid contact is carried out for a long period of time during which the absorbent fluid carries out a circular path (that is, it rises and falls). Furthermore, when the discharged streams reach their peaks and fall extending like umbrellas, the absorbent fluid 57 is divided into droplets of liquid and therefore increases the effect of gas-liquid contact. When the content of sulfur dioxide and similar compounds in combustion gas is low, an economic operation can be carried out by varying the height of the columns of the liquid. In addition, as compared to an apparatus of the so-called packed tower type, in which an absorbent fluid is flowed down through a tower packed with grid-like lattices, and thus brought into contact with a gas, the apparatus of the aforementioned type has different advantages, for example, in that the fluid passage of this apparatus is less susceptible to clogging. However, in the aforementioned technique, the injection pump 59, which has a high power load is operated to pour the absorbent fluid 57 into the fluid reservoir 56 from the nozzles 55 (only one injection pump is shown in Figure 5 for the purpose of simplification, but in fact a variety of injection pumps are used). In order to make the apparatus more compact and reduce the cost of equipment and operating cost, it would be wise to omit these injection pumps. Accordingly, an object of the present invention is to provide a gas-liquid contact apparatus that can make the equipment more compact and reduce the cost of equipment, operating cost and other costs without reducing the absorption efficiency of the dioxide. sulfur and similar compounds. SUMMARY OF THE INVENTION In order to solve the problems described above, the present invention offers a gas-liquid contact apparatus that includes an absorption tower in which desalination and other treatments of the combustion gas are carried out, by pouring a absorbent fluid stored in an upstream fluid reservoir from nozzles placed in the absorption tower and, at the same time, introducing the combustion gas into the absorption tower from the bottom of the absorption tower, and causing it to flow upwards to Through the region of injection of the absorbent fluid, characterized in that the fluid level of the fluid reservoir is determined such that it is above the position of the nozzles, the means of the manifold are installed in a position above the level of the fluid. fluid and allow the collector media to collect at least a portion of the absorbent fluid poured from the nozzles, and the Absorbent lumen trapped by the collector means is returned to the fluid reservoir through a circulation passage. The reason why the fluid level of the fluid reservoir is thus determined to be above the position of the nozzles, is because the absorbent fluid is poured from the nozzles by the action of the pressure head of the fluid stored in the reservoir. fluid reservoir (that is, the difference between the height of the fluid surface and the height of the nozzles). In this way, as the absorbent fluid is poured by the action of the fluid pressure head into the fluid reservoir, the need to use injection pumps having a high power load can be eliminated.

In addition, the manifold means is installed in a position above the fluid level, and the absorbent fluid is poured from the nozzles at a height above the manifold means. In this way, at least a portion of the falling absorbent fluid is collected by the collector means and returned to the fluid reservoir so that the fluid level of the fluid reservoir can be kept constant. The collector means used herein may include, for example, channel members that are arranged in an appropriate manner in order to pass the updrafts but which efficiently receive the absorbing fluid that falls from the peaks. the currents as they spread like umbrellas; a cyclone-shaped means that traps the absorbent fluid by bringing together the uppermost portions of the streams poured in the vicinity of the side wall of the absorption tower; or other suitable means. In this case, the proportion of the absorbent fluid collected by the collector means should preferably be as high as possible, and it is ideal that the absorbent fluid be collected and returned completely. If a part of the absorbent fluid falls down instead of being collected by the collector means, the uncollected portion of the absorbent fluid can be handled, for example, by accumulating it in the lower part of the absorption tower and returning it to the fluid reservoir by medium of a circulatory pump that has a low power load. Further, in order that the peaks of the upstream streams from the nozzles may rise above the fluid level of the fluid reservoir, the combustion gas is flowed in the same upward direction as the absorbent fluid is flowed. pour In this way, the flow of the combustion gas acts on the discharged streams in order to raise them above the level of the fluid. Additionally, the aforementioned flow passage allows the absorbent fluid collected by the collector means to flow into the fluid reservoir by its own weight. This circulation step may include, for example, a groove or channel that opens to the atmosphere and therefore allows the circulating fluid to come into contact with the atmosphere. However, the circulation passage preferably must include a pipe or hose that is protected from the atmosphere and therefore not able to allow the untreated combustion gas flowing simultaneously into the atmosphere to escape.

This gas-liquid contact apparatus can be applied, for example, to an absorption tower functioning as a desulfurizer of the wet combustion gas or an absorption tower that functions as an apparatus for removing other harmful gases (for example, hydrogen chloride, fluorine, hydrogen fluoride and silicone fluoride). In the gas-liquid contact apparatus of the present invention, vapor collector means can be installed within the absorption tower in a position above the section into which the absorbent fluid is poured, and the vapor collected by these means The steam collector can be returned to the fluid reservoir. Specifically, when the combustion gas is flowed in the same direction as the absorbent fluid is poured, the amount of vapor contained in the combustion gas that has passed through the discharged streams is increased. If the combustion gas is discharged as it is, not only the absorbent fluid is wasted, but also the treated combustion gas having steam mixed therein is emitted out of the system, undesirably. Accordingly, the steam collector means are installed above the streams poured for the purpose of collecting and returning the steam.

The steam collector means used herein may include any of several devices such as, for example, diffuser plate type, type bent plate, cyclone type, or maya wire type. In addition, the transverse air of the upper part of the absorption tower can be enlarged. For example, if the cross-sectional area of the absorption tower is widened in the vicinity of the spouts of the discharged streams, this enlarged transverse aerial reduces the flow velocity of the combustion gas and therefore encourages droplet dropping of liquid from of the flows discharged. Thus, the effect of the recovery of the absorbent fluid can be improved. Additionally, the fluid reservoir can function as an oxidation tank to carry out the oxidation reaction of absorbent fluid. In a gas-liquid contact apparatus that functions as a desulfurizer of the flue gas, the sulfur dioxide is absorbed into the absorbent fluid to form a sulfite. Then, this sulphite is oxidized by supplying air (oxygen) to the absorbent fluid. When the gas-liquid contact apparatus of the present invention is applied, for example, to a wet combustion gas desulphurizer or the like, the fluid reservoir can function as an oxidation tank in which the absorbent fluid oxidizes. through the air (oxygen) supplied to this oxidation tank. This makes the separate installation of an oxidation tank unnecessary, which results in a simplification of the entire equipment. In addition, the passage of the circulation to return the absorbent fluid from the collector means to the fluid reservoir may include a circulation pipe protected from the atmosphere. Specifically, when the fluid reservoir functions as an oxidation tank, the circulation passage that includes a furrow or other member open to the atmosphere is not convenient because the untreated combustion gas within the absorption tower propagates it to the atmosphere. Accordingly, the circulation passage is formed in a circulation pipe protected from the atmosphere, so that the untreated combustion gas flowing together with the circulating fluid can be introduced into the oxidation tank without spreading in the atmosphere. In this case, the circulation pipe protected from the atmosphere may include, for example, a pipe or a hose. When the fluid reservoir functions as an oxidation tank, the circulation line may have a shorter end that extends downward and is immersed in the absorbent fluid within the fluid reservoir, and the air line may be connected to the line of circulation so that air (oxygen) is supplied to the absorbent fluid within the fluid reservoir simultaneously with the return of absorbent fluid. The air (oxygen) supplied in this way serves to carry out the oxidation reaction. When the air pipe is connected to the circulation pipe, the absorbent fluid flowing down through the circulation pipe by its own weight, causes the air to be sucked inward and drawn into the fluid reservoir, such way that the air supply compressor and related components can be suppressed. Further, since the lower end of the circulation pipe is immersed in the absorbent fluid, inside the fluid reservoir, air (oxygen) can be effectively introduced into the absorbent fluid. In addition, the combustion gas is preferably flowed at a high speed not less than 5 m / sec. In the case of a conventional liquid-gas contact apparatus of the so-called liquid column type, the rate of flow of combustion gas is generally not greater than 5 m / sec. In the gas-liquid contact apparatus of the present invention, a flow rate of not less than 5 m / sec is employed. This not only improves the lifting effect of the flows discharged from the absorbent fluid and therefore raises the peaks of the flows discharged above, but also increases the amount of absorbing fluid remaining in the combustion gas (i.e., the retention of absorbent fluid). In addition, the interior of the liquid droplets is stirred sufficiently to cause an increase in the rate of absorption of the liquid droplets. Additionally, the velocity of the droplets of the liquid relative to the combustion gas considered to be the viscous fluid increases, so that the surrounding film that forms on the surface of the droplets of the liquid thins further. For this and other reasons, the contact effect of the gas-liquid increases to achieve a greater efficiency of desulfurization than the conventional one. In this aspect, Figure 4 shows the results of an experiment in which, when using a gas-liquid contact apparatus according to the present invention, the relationship between the flow velocity (m / seconds) of the combustion gas and the degree of desulfurization (%) was examined maintaining the flow velocity of the absorbent fluid and the height of the liquid columns at certain fixed values. By this experiment, the present inventors have discovered that, if the flow velocity of the combustion gas exceeds 5 m / sec, the degree of desorption increases as the flow rate increases. Furthermore, if the flue gas flow rate increases, the flow velocity can be guaranteed despite a decrease in the transverse air of the absorption tower. Accordingly, the absorption tower can be made more compact and the number of nozzles can also be decreased, which results in a reduced equipment cost. As described above, the gas-liquid contact apparatus of the present invention is characterized in that the fluid level of the fluid reservoir is determined such that it is above the nozzle position, collector means are installed to collect at least a portion of the absorbent fluid-poured by the action of the pressure head in a position above the fluid level, and the absorbent fluid trapped by the collector means is returned through a circulation passage. In this way, the need to use injection pumps that have a high power load is eliminated and, therefore, the operating cost can be reduced. In addition, if the vapor collected by the vapor collector means is returned to the fluid reservoir, the absorbent fluid can be used efficiently and the combustion gas that does not contain vapor can be discharged. Additionally, if the overhead air of the upper part of the absorption tower is widened, the absorbent fluid can be recovered more efficiently. In addition, the fluid reservoir is operated as an oxidation tank, and the overall construction of the equipment, for example, of a wet combustion gas desulfurizer can be made more compact. On the other hand, if the circulation passage includes a circulation pipe protected from the atmosphere, untreated combustion gas is prevented from being emitted into the atmosphere. In addition, if the circulation pipe has a shorter end that extends downward and is immersed in the absorbent fluid within the fluid reservoir, and the air line is connected to the circulation line, it can be supplied automatically and effectively. air (oxygen) to the oxidation tank, and the equipment can be simplified. Additionally, if the combustion gas is flowed at a rate greater than the predetermined speed, an improvement in the desorption efficiency can be achieved and the equipment can be made more compact, for example, due to a decrease in the transverse air. BRIEF DESCRIPTION OF THE ILLUSTRATIONS Figure 1 is a schematic view of an exemplary liquid gas contact apparatus in accordance with the present invention; Figure 2 is a sectional view taken on line A-A in Figure 1; Figure 3 is a perspective view of the collector means used therein; Figure 4 is a graph showing the relationship between the flow velocity of the combustion gas and the degree of desulfurization, where the flow velocity (in m / seconds) of the combustion gas is plotted as abscissa and the degree of desorption ( in%) as ordered; and Figure 5 is a schematic view of a conventional gas-liquid contact apparatus. DETAILED DESCRIPTION OF THE PREFERRED FORM OF EMBODIMENT An embodiment of the present invention will be described below with reference to the accompanying drawings.

Figure 1 is a schematic view of an exemplary gas-liquid contact apparatus in accordance with the present invention, Figure 2 is a sectional view taken on line A-A, in Figure 1 and Figure 3 is a perspective view of the collection means used herein. The gas-liquid contact apparatus of the present invention can be applied, for example, to an absorption tower of a wet combustion gas desulfurizer, and is constructed in such a way as to achieve an improvement in the gas contact apparatus. liquid of the so-called liquid column type in which an absorbent fluid (eg, a whitewash) is poured up from the nozzles and is brought into contact with the combustion gas flowing therethrough in order to absorb the sulfur dioxide in the absorbent fluid. In this connection, the oxygen is supplied to the absorbent fluid which has absorbed sulfur dioxide therein, so that the resulting sulfite is oxidized to form gypsum. Alternatively, in some cases, the sulphite does not oxidize but recovers as crystalline solid. In a gas-liquid contact apparatus of the example according to the present invention, as illustrated in Figure 1, an oxidation tank 2 is installed which serves as a fluid reservoir in close proximity in an absorption tower 1, and an absorption fluid 3 is stored in this oxidation tank 2. When it is desired to recover the sulfite directly as a secondary product, the oxidation tank 2 does not need to function for oxidation purposes, but can only function as a fluid reservoir. The absorption tower 1 is equipped with head tubes 5 which communicate with the oxidation tank 2 by means of a connection pipe 4. That connection pipe 4 is equipped with a valve 6 to open or close the line of the pipe , and the aforementioned head tubes 5 have a large number of nozzles 7 for pouring the absorbent fluid 3 upwards. An inlet section of the flue gas 8 for introducing the flue gas into the absorption tower 1 is formed in the lower part thereof, and a flue gas outlet section 9 for discharging the flue gas from the tower Absorption 1 is formed at the top of it. The combustion gas introduced from the inlet section of the combustion gas 8 is flowed upwards through an absorption tower 1, and in this way the contact of the gas-liquid with the discharged streams of the absorbent fluid is achieved. The treated flue gas is discharged from the flue gas outlet section 9. In the present invention, the flue gas is made to flow from the flue gas inlet section 8 to the flue gas outlet section. as will be described later. In this way, the peaks of the streams discharged from the nozzles 7 are raised and, at the same time, an improvement in the efficiency of the desorption is achieved. On the other hand, a vapor eliminator 10 is installed which serves as steam collector means above the absorbent fluid injection region of the absorption tower 1, so that any vapor contained in the treated combustion gas can be collected thus. Furthermore, the means of the collector 11, as will be described later, are installed in the upper intermediate part of the absorption tower 1, in such a way that at least a portion of the absorbent fluid 3 poured from the nozzles 7 can be collected in this way . Additionally, in order to return the collected portion of the absorbent fluid 3 to the oxidation tank 2, a circulation pipe 12 that includes a pipe or hose extends from the means of the collector 11 to the oxidation tank 2. In addition, the aerial Cross section of the absorption tower -1 is widened in the vicinity of the peaks of the discharged streams, so that this transverse aerial enlarged reduces the flow velocity of the discharged streams and therefore encourages the droplet dropping of liquid. At the same time, a circular groove 17 forming part of the means of the collector 11, as will be described later, is installed using the step resulting from the enlargement of the transversal air. On the other hand, a recovery section 13 for receiving the portion of the absorbent fluid 3 not collected by the means of the collector 11 is installed in the lower part of the absorption tower 1. In order to return the absorbent fluid 3 accumulated in this recovery section 13 to the oxidation tank 2, a return pipe 14 is installed between the recovery section 13 and the oxidation tank 2. This return pipe 14 is equipped with a recovery pump 15. As described above, the absorbent fluid 3 is stored in the aforementioned oxidation tank 2. The level H of this absorbent fluid 3 is determined in order to be placed above the position of the aforementioned nozzles 7. This oxidation tank 2 is equipped with a stirrer 16 to agitate the absorbent fluid 3. In addition, a withdrawal line to remove the slurry from the oxidizer tank is also connected to the oxidation tank 2. 2, a feeding line for refilling the absorbent fluid 3 and similar aspects, but is not shown in Figure 1 to simplify the present. At this time, the aforementioned collector means 11 are explained with further reference to Figures 2 and 3. The means of the collector 11 include, for example, a circular groove 17 formed in the passage of the internal wall of the absorption tower. 1, and a variety of channel members 18 extending parallel to the pipes of the aforementioned head 5. These members of the circular groove 17 and the channels 18 are positioned above the H level of the absorbent fluid 3 within the oxidation tank. 2. As illustrated, for example, in Figures 2 and 3, the members of channel 18 are arranged in such a way that they do not interrupt updrafts and, at the same time, can effectively collect the falling absorbent fluid. from the peaks of the currents while they extend in the form of umbrellas. In the illustrated embodiment, the members of the channel 18 and the pipes of the head 5 are alternately positioned, and each member of the channel 18 is positioned at a medium distance between the pipes of the adjacent head 5. On the other hand, as shown in FIG. illustrated in Figure 2, the ends of each member of the channel 18 are connected to a circular groove 17 in order to communicate with it. If necessary, additional consideration should be given to the members of the channel 18. For example, in order to cause the received absorbent fluid to flow slightly into the circular groove 17, the members of the channel 18 are tilted in such a way that the central part of each member of channel 18 rises over its ends (circular groove side). In fact, the members of channel 18 can be placed in any way that is desired. As long as the poured absorbent fluid can be collected effectively, the members of the channel 18 can be arranged in any way that there are two or more pipes of the head 5 interposed therebetween. Alternatively, the members of the channel 18 may be arranged in the form of a lattice by placing them in a direction parallel to the pipes of the head 5 and in a direction perpendicular thereto. In addition, it is also possible to install only the circular groove 17 in the side wall of the absorption tower and omit the members of the channel 18. The upper end of the circulation pipe 12 is connected to the aforementioned circular groove 17, while the end The bottom of the circulation pipe 12 is immersed in the absorbent fluid 3 inside the oxidation tank 2 and extends towards the vicinity of the lower part thereof. In this way, the collected portion of the absorbent fluid 3 is allowed to flow down through the circulation pipe 12 by its own weight and to return to the oxidation tank 2., an air pipe 20 is connected to this circulation pipe 12. In this way, while the absorbent fluid collected by the means of the collector 11 flows down through the circulation pipe 12 by its own weight, the air is sucked through the air pipe 20 and is drawn into the oxidation tank 2. Additionally, a ventilation equalizer 21 is installed between the oxidation tank 2 and the absorption tower 1. Thus, the residual air present in the upper space of the Oxidation tank 2, which is formed essentially by nitrogen gas, is conducted to the exhaust section of the combustion gas 9 of the absorption tower 1. The operation of the gas-liquid contact apparatus possessing the aforementioned construction is describe below. As illustrated in Figure 1, the absorbent fluid 3 is fed to the oxidation tank 2, and its level H is determined in such a way that it is above the position of the nozzles 7 and below the position of the means of the manifold 11. In this condition, the valve 6 in the pipeline connection 4 operates in such a way as to cause the oxidation tank 2 to communicate with the pipes of the head 5. At the same time, combustion gas is introduced from the inlet section of the combustion gas 8 at a high flow rate. Therefore, the absorbent fluid 3 is poured upwards from the nozzles 7 by the action of the pressure head defined by the difference (h) in height between the fluid level H of the oxidation tank 2 and the nozzles 7. In addition, Due to the lifting effect of the combustion gas introduced from the inlet section of the flue gas 8 at a high flow rate, the peaks of the discharged streams also rise above the fluid level H. As a consequence, the poured streams pass through. through the openings between the members of the channel 18 and rise to a position above the fluid level H. In this illustrated embodiment, the flow velocity of the combustion gas is not less than 5 m / sec (and preferably in the range of 5 to 15 m / seconds). This not only improves the lifting effect of the discharged streams, but also improves the efficiency of the desulfurization due to an increase in the efficiency of the gas-liquid contact. After the discharged streams rise through the openings between the members of channel 18 and reach their peaks, they fall downwardly extending in the form of sunshades. The larger portion of the absorbent fluid constituting the streams is collected by the members of the channel 18 and the circular groove 17, and the remainder falls into the recovery section 3. This portion of absorbent fluid collected by the means of the collector 11 flows towards down through the circulation pipe 12 by its own weight and joins the absorbent fluid 3 within the oxidation tank 2. On its way to the oxidation tank, the air is sucked through the air pipe 20 and is entrained towards the absorbent fluid 3 inside the oxidation tank 2.

Since the lower end of the circulation pipe 12 is immersed in the absorbent fluid within the oxidation tank 2, the air sucked through the air pipe 20 can be effectively introduced into the absorbent fluid. On the other hand, the portion of the absorbent fluid 3 that has fallen into the recovery section 13 returns to the oxidation tank 2 by the operation of the recovery pump 15 having a low power load. In the oxidation tank 2, the agitator 16 is put into operation and the oxidation of the absorbent fluid 3 is promoted by the air (oxygen) sucked through the air line 20. If necessary, the additional one (oxygen) can be supplied. through the lower part of the oxidation tank 2. This portion of the absorbent fluid 3 that has been converted into concentrated slurry as a result of the oxidation thereof, is removed through a withdrawal line (not shown) and transferred to a descending step where it is subjected to a treatment for the formation of plaster. In addition, if necessary, the fresh absorbent fluid 3 is refilled through the feed line (not shown). The residual air present in the upper space of the oxidation tank, formed essentially by nitrogen gas, is conducted towards the vicinity of the exhaust section of the combustion gas 9 of the absorption tower 1 through the ventilation equalizer 21. On the other hand, the treated combustion gas from which the sulfur dioxide has been eliminated as a result of the contact of the gas-liquid flows towards the outlet section of the combustion gas 9. As the flow velocity of the combustion gas is high, the treated combustion gas contains a large amount of steam. However, the vapor contained in the combustion gas loses its velocity during the passage through the section of the enlarged transverse air and therefore tends to fall. In addition, the vapor is collected during the passage of the combustion gas through the vapor eliminator 10 and returns to the oxidation tank 2 through a circulation passage (not shown). In the manner described above, the absorbent fluid 3 can circulate by pouring the absorbent fluid 3 from the nozzles 7 by the action of the pressure head h, without installing injection pumps having a particularly high power load. This makes it possible not only to reduce the operating cost, but also to decrease the overall transverse air of the absorption tower due to the high flow rate of the combustion gas and therefore the absorption tower is made more compact. In addition, you can also decrease the number of nozzles under certain conditions. It should be understood that the present invention is not limited to the embodiment described above. It is understood without saying, that the gas-liquid contact apparatus which possesses substantially the same construction and produces the same effects as those of the present invention, also falls within the technical scope of the present invention. For example, the means of the collector 11 need not precisely include channel members. Instead, the direction of the streams discharged from the nozzles 7 can be tilted to produce a spiral flow in the absorption tower 1 and thus collect the absorbent fluid 3 in a manner similar to the cyclone, or other means can also be employed . In addition, if the discharged streams can be almost completely trapped by the means of the collector 11, the implicit recovery pump 15 and related components may be unnecessary.

Claims (7)

1. CLAIMS 1. A gas-liquid contact apparatus that includes an absorption tower in which the desulfurization and other treatments of the combustion gas are carried out, by pouring an absorbing fluid stored in a fluid reservoir upwards from the nozzles placed in the container. The aforementioned absorption tower and, at the same time, introducing the combustion gas into said absorption tower from the lower part thereof and causing it to flow upwards through the injection region of the absorbent fluid, which is characterized in that the fluid level of said fluid reservoir is determined in such a way that it is above the position of the mentioned nozzles, the means of the manifold are installed in a position that is above the fluid level mentioned and allows the means of the Said manifold collect at least a portion of the absorbent fluid poured from the aforementioned nozzles, and the absorbing fluid e collected by the aforementioned collector means returns to the mentioned fluid reservoir through a circular passage.
2. 2. A gas-liquid contact apparatus as set forth in claim 1 wherein the means of the steam collector is installed within said absorption tower in a position above the contact region of the gas-liquid mentioned, and The steam collected by the mentioned steam collector means returns to the aforementioned fluid reservoir.
3. 3. A gas-liquid contact apparatus according to claim 1 or 2, wherein the transverse air of the upper part of said absorption tower is enlarged.
4. 4. A gas-liquid contact apparatus according to any of the claims 1 to 3, where the aforementioned fluid reservoir functions as an oxidation tank to carry out the oxidation reaction of absorbent fluid.
5. 5. A gas-liquid contact apparatus as set forth in claim 4, wherein said passage of flow to return the absorbent fluid from the collector means to the aforementioned fluid reservoir includes a circulation line protected from the atmosphere .
6. 6. A gas-liquid contact apparatus according to claim 5, wherein said circulation line has a lower end that extends downwards and is immersed in the absorbent fluid within said fluid reservoir and a pipeline. The air is connected to the aforementioned circulation pipe so that air is supplied to the absorbent fluid within the fluid reservoir simul- taneously with the return of absorbent fluid.
7. 7. A gas-liquid contact apparatus according to any of claims 1 to 6, wherein the combustion gas is flowed at a high velocity not less than 5 m / sec.