Ozone absorption tower

Abstract

The system includes headers (204a, 204b) that fit into the opening of the cylindrical container (201) and introduce or discharge ozone gas (105) into or from the cylindrical container (201), an adsorbent (103) filled to a predetermined space in the cylindrical container (201), a plurality of cooling coils (213) evenly and parallelly inserted in the adsorbent (103), and a refrigerator (212) that delivers refrigerant to the plurality of cooling coils (213), and the adsorbent (103) in the cylindrical container (201) can be uniformly and directly cooled by the cooling coils (213).

Description

[Technical Field]

[0001] The present disclosure relates to an ozone adsorption tower. [Background technology]

[0002] When ozone is supplied to facilities that use ozone, such as pulp bleaching or water treatment, the ozone generated by an ozone generator is concentrated before supplying it. Ozone is concentrated by utilizing the property of ozone, which adsorbs at low temperatures onto adsorbents such as silica gel. Specifically, ozone is concentrated by sequentially switching between three processes: an adsorption process in which ozone-containing gas supplied from an ozone generator is introduced into multiple adsorption towers filled with an adsorbent such as silica gel, which preferentially adsorbs ozone, to adsorb the ozone onto the adsorbent; a desorption process in which the adsorbent in the adsorption towers is heated after the adsorption process to desorb the ozone; and a cooling process in which the adsorbent in the adsorption towers is cooled to the adsorption process temperature after the desorption process.

[0003] In a known cooling system during this adsorption process, a main cooling coil is inserted into the ozone adsorption tower, and the adsorbent packed in the ozone adsorption tower is directly cooled by a refrigerant flowing from a refrigerator to the main cooling coil, while a sub-cooling coil is also used to cool the ozone adsorption tower itself (see, for example, Patent Document 1). This allows the adsorbent to be cooled to a constant temperature by the sub-cooling coil even if an abnormality occurs in the refrigerator of the main cooling coil. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-53404 Summary of the Invention [Problem to be solved by the invention]

[0005] In Patent Document 1, during the adsorption process, the adsorbent is directly cooled from within the adsorption tower by the main cooling coil, and at the same time the adsorption tower is cooled by the sub-cooling coil, thereby indirectly cooling the adsorbent to a level that does not cause ozone desorption, thereby achieving uniform cooling. However, while the main cooling coil supplies refrigerant directly from the refrigerator, the sub-cooling coil requires a route separate from the main cooling coil for supplying liquefied oxygen from the liquefied gas supply route and oxygen gas from the low-temperature gas supply route at optimal flow rates, which poses challenges in terms of securing piping space and installation costs.

[0006] The present disclosure has been made to solve the above-mentioned problems, and an object of the present disclosure is to provide an ozone adsorption tower that can uniformly cool the adsorbent using a simple cooling configuration inside the adsorption tower. [Means for solving the problem]

[0007] The ozone adsorption tower according to the present disclosure is a cylindrical container, One end side It fits into the opening and introduces ozone gas into the cylindrical container. Enter R 1st Header, a cylindrical container filled in a predetermined space , and adsorbs the introduced ozone gas. Adsorbent, adsorbent Parallel and average etc. Inserted multiple cooling coils, multiple cooling coils The cooling coil is connected to both ends of the cooling coil that is led outside the cylindrical container, and the refrigerant discharged from one end is cooled and supplied to the cooling coil inside the cylindrical container from the other end, thereby circulating the refrigerant through the multiple cooling coils. Refrigeration machine, a second header fitted to the opening at the other end of the cylindrical container, for discharging ozone gas that has not been adsorbed by the adsorbent from the cylindrical container; Equipped with Et It is characterized by: [Effects of the Invention]

[0008] According to the ozone adsorption tower of the present disclosure, the adsorbent can be cooled more uniformly with a simple cooling configuration using multiple cooling coils inserted into the adsorbent. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is a diagram illustrating an ozone adsorption tower of a comparative example. [Figure 2]FIG. 1 is a diagram illustrating an ozone adsorption tower according to a first embodiment. [Figure 3] 3 is a cross-sectional view taken along the line AA in FIG. 2. [Figure 4] FIG. 10 is a diagram illustrating an ozone adsorption tower according to a second embodiment. [Figure 5] FIG. 4 is a cross-sectional view of FIG. 3 taken along line B-B. [Figure 6] FIG. 10 is a diagram illustrating an ozone adsorption tower according to a third embodiment. [Figure 7] FIG. 10 is a diagram illustrating an ozone adsorption tower according to a fourth embodiment. [Figure 8] FIG. 10 is a diagram illustrating an ozone adsorption tower according to a fifth embodiment. [Figure 9] FIG. 10 is a diagram illustrating an ozone adsorption tower according to a sixth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, preferred embodiments of an ozone adsorption tower according to the present disclosure will be described with reference to the drawings. The same components and corresponding parts are designated by the same reference numerals, and detailed descriptions thereof will be omitted. Similarly, in the following embodiments, redundant descriptions of components designated by the same reference numerals will be omitted.

[0011] Embodiment 1 First, a comparative example will be described. FIG. 1 is a diagram illustrating an ozone adsorption tower as a comparative example. In an ozone adsorption tower 10, a plurality of tube pipes 102 are arranged in parallel inside a cylindrical container 101, and the tube pipes 102 are filled with an adsorbent 103 such as silica gel. Headers 104a and 104b are fitted into the upper and lower openings of the cylindrical container 101. The header 104a has a hollow structure composed of bottom plates 104a1 and 104a2 and a cylindrical side plate, and one open end of the tube pipe 102 penetrates the bottom plate 104a1 and faces the hollow space. The header 104b also has a hollow structure composed of bottom plates 104b1 and 104b2 and a cylindrical side plate, and the other open end of the tube pipe 102 penetrates the bottom plate 104b1 and faces the hollow space. Pipe-like portions 106a and 106b for introducing or discharging ozone gas 105 are formed in the central portions of bottom plates 104a2 and 104b2 of the headers 104a and 104b.

[0012] Furthermore, pipes 109a and 109b penetrate the side of cylindrical container 101, and the penetration portions are sealed. In this case, pipe 109a penetrates the bottom of cylindrical container 101, and pipe 109b penetrates the top of cylindrical container 101. Pipe 109a is connected to refrigerator 112 via pump 110, and pipe 109b is connected to refrigerator 112, forming a circulation path for cooling brine 107. Heat radiation is suppressed by covering cylindrical container 101, headers 104a and 104b, and pipes 109a and 109b with heat insulating material 111 formed on a container, tape, or the like. The top and bottom of the pipes 109a and 109b that penetrate cylindrical container 101 may be reversed.

[0013] The operation of the ozone adsorption tower 10 configured as above will now be described. Ozone gas 105 (shown by the open arrow in FIG. 1 ) is injected into the tube piping 102 filled with the adsorbent 103. At the same time, cooling brine 107 is circulated through the gaps between the tube pipings 102 arranged in parallel inside the cylindrical container 101. The cooling brine 107 (shown by the black arrow in FIG. 1 ) drawn from the refrigerator 112 is introduced from the pump 110 into the cylindrical container 101 via the pipe 109a and then returned to the refrigerator 112 via the pipe 109b. The circulation of the cooling brine 107 cools the tube piping 102. Ozone gas 105 is introduced into the tubular portion 106a from an ozone generator (not shown). The introduced ozone gas diffuses in the hollow portion of the header 104a and is supplied to each open end of the multiple tube pipings 102. The supplied ozone gas is adsorbed into the adsorbent 103, which is indirectly cooled by the cooling brine 107. The gas that is not adsorbed by the adsorbent 103 is collected in the hollow portion of the header 104b and discharged from the tubular portion 106b.

[0014] In the ozone adsorption tower 10 configured as described above, the adsorbent 103 in the ozone adsorption tower 10 needs to be cooled to an extremely low temperature, for example, about −10° C. or lower, to improve the ozone adsorption and desorption efficiency. Therefore, the refrigerator 112 is installed outside the ozone adsorption tower 10, and the cooling brine 107 uses a secondary refrigerant (brine) cooled by a primary refrigerant in the refrigerator 112. This secondary refrigerant is circulated through pipes 109a and 109b connecting the refrigerator 112 and the ozone adsorption tower 10, and the adsorbent 103 in the ozone adsorption tower 10 is cooled by the secondary refrigerant. Therefore, heat is dissipated from the pipes 109a and 109b between the refrigerator 112 and the ozone adsorption tower 10, and the cost of the heat insulating member 111 for insulating this heat dissipation is required. Furthermore, a secondary refrigerant circulation pipe is required between the refrigerator 112 and the ozone adsorption tower 10, which increases the overall size of the cooling system.

[0015] In contrast, the first embodiment uses a simple piping configuration in which a plurality of cooling coils 213 are inserted in parallel and uniformly into the adsorbent 103 filled in the cylindrical container 201 of the ozone adsorption tower 20, thereby directly and uniformly cooling the adsorbent 103.

[0016] FIG. 2 is a diagram illustrating the configuration of an ozone adsorption tower according to the first embodiment. In the ozone adsorption tower 20, a cylindrical container 201 is filled with an adsorbent 103 such as silica gel. The amount of space within the cylindrical container 201 to be filled with the adsorbent 103 is determined in advance. Headers 204b and 204a are fitted into the upper and lower openings of the cylindrical container 201. The header 204a has a hollow structure composed of a bottom plate 204a1, a bottom plate 204a2, and cylindrical side plates. The bottom plate 204a1 is made of punched metal with a large number of holes formed therein, each hole having a diameter smaller than that of the adsorbent 103, to prevent the adsorbent 103 from penetrating into the hollow space. A tubular portion 206a for introducing ozone gas 105 is formed in the center of the bottom plate 204a2.

[0017] The header 204b fitted into the opening at the top of the cylindrical container 201 is composed of a bottom plate 204b2 and a cylindrical side plate. A tubular portion 206b for discharging ozone gas 105 is formed in the center of the bottom plate 204b2 facing the outside. The header 204b functions as a lid and is removable. When removed, the adsorbent 103 is loaded into the cylindrical container 201. The adsorbent 103 is loaded so as not to exceed the height of the cylindrical side plate of the header 204b, which is the fitting portion with the cylindrical container 201. This forms a space between the bottom plate 204b2 and the filled adsorbent 103 in which a cooling coil 213, which will be described later, is disposed.

[0018] A pipe 209b passes through the side of the cylindrical container 201, and the passage is sealed. A cooling coil 213 connected to a refrigerator 212 passes through the pipe 209b and is inserted into the adsorbent 103 in the cylindrical container 201. The cooling coil 213 is a tubular cooler through which a refrigerant supplied from the refrigerator 212 flows. The cooling coil 213 is typically wound in a coil shape to increase its surface area. However, the shape is not limited to a coil shape and may be linear, spiral, or U-shaped. Since the refrigerant supplied from the refrigerator 212 circulates within the pipe, both ends of the cooling coil 213 are connected to the refrigerator 212. The refrigerant introduced from one end circulates within the cooling coil 213, cooling the adsorbent 103 around the cooling coil 213, and then returns to the refrigerator 212 from the other end. The pipe 209b leading to the refrigerator 212 and the cylindrical container 201 are covered with a heat insulating member 111 to suppress heat radiation from the cooling coil 213.

[0019] 3 is a cross-sectional view taken along the line AA in FIG. 2. A plurality of cooling coils 213 are arranged parallel to one another at approximately equal intervals (indicated by double-headed arrows in FIG. 3) within the adsorbent 103 of the cylindrical container 201. If the outgoing path is from the refrigerator 212 to the bottom of the cylindrical container 201 and the returning path is from the bottom back to the refrigerator 212, the plurality of cooling coils 213 are formed by one cooling coil for each of the outgoing path and the returning path, and the cooling coils for the outgoing path and the returning path are connected to form a loop. Note that both the outgoing path and the returning path may be formed within a single cooling coil.

[0020] A plurality of cooling coils each having a loop formed in this manner may be inserted into the adsorbent 103. Alternatively, although there is one cooling coil 213 from the refrigerator 212 to the pipe 209b, the cooling coil 213 on the outward path may branch into multiple coils at the portion where the pipe 209b enters the header 204b (the space between the bottom plate 204b2 and the filled adsorbent 103) and inserted into the adsorbent 103, and the branched cooling coils 213 may be integrated within the header 204b (the space between the bottom plate 204b2 and the filled adsorbent 103) on the return path. In this case, the integrated cooling coil 213 is covered with a heat insulating member 111. To further enhance the cooling effect, fins may be provided on the cooling coil 213 inserted into the adsorbent.

[0021] The operation of the ozone adsorption tower 20 configured as above will now be described. Ozone gas 105 is introduced from the tubular portion 206a into the cylindrical container 201 filled with the adsorbent 103. A refrigerant is circulated through cooling coils 213 arranged in parallel within the adsorbent 103. The cooling coils 213 are arranged from the top to the bottom of the cylindrical container 201 filled with the adsorbent 103, and multiple cooling coils 213 are arranged in parallel at equal intervals in the radial direction of the cylindrical container 201. This allows the adsorbent 103 to be directly and uniformly cooled, thereby achieving high cooling efficiency. While the refrigerant circulates within the cooling coils 213, ozone gas 105 is introduced from the tubular portion 206a, diffuses in the hollow portion of the header 204a, and is supplied to the adsorbent 103 through holes in the punched metal. The supplied ozone gas is adsorbed into the adsorbent 103, which is indirectly cooled by the cooling coils 213. The gas not adsorbed by the adsorbent 103 is discharged from the tubular portion 206b formed in the header 204b.

[0022] As described above, according to the configuration of the first embodiment, the cooling coil 213 inserted in the adsorbent 103 is arranged from the refrigerator 212 to the ozone adsorption tower 20, and this simple piping configuration reduces the amount of heat dissipation required for cooling compared to the comparative example, thereby reducing the cost required for insulation. Furthermore, since a secondary refrigerant circulation piping between the refrigerator 212 and the ozone adsorption tower 20 is not required, the overall size of the cooling system is also reduced. Furthermore, by inserting multiple cooling coils 213 in parallel at equal intervals in the ozone adsorption tower 20 and directly cooling the adsorbent 103, high cooling efficiency can be achieved.

[0023] Embodiment 2 FIG. 4 is a diagram illustrating the configuration of an ozone adsorption tower according to a second embodiment. The ozone adsorption tower 30 includes a cylindrical container 301 with a plurality of cooling pipes 302 arranged in parallel, and a cooling coil 313 inserted into the cooling pipes 302. The space inside the cylindrical container 301, excluding the cooling pipes 302, is filled with an adsorbent 103 such as silica gel. The amount of adsorbent 103 to be filled into the cylindrical container 301 is predetermined. Header 304b and 304a are fitted into the upper and lower openings of the cylindrical container 301. The header 304a has a hollow structure comprised of bottom plates 304a1 and 304a2 and a cylindrical side plate. One open end of the cooling pipe 302 penetrates the bottom plate 304a1 and faces the hollow space. A brine filling port 306a is formed in the center of the bottom plate 304b2 of the header 304b, through which cooling brine is introduced into the cooling pipe 302. The brine charging port 306a is preferably provided at the top of the ozone adsorption tower 30, taking into consideration the gravity of the brine.

[0024] The header 304b fitted into the opening at the top of the cylindrical vessel 301 has a hollow structure composed of a bottom plate 304b2 facing the outside, a bottom plate 304b1, and a cylindrical side plate, and the other open end of the cooling pipe 302 penetrates the bottom plate 304b1 and faces the hollow space. The adsorbent 103 may be introduced into an inlet provided on the side of the cylindrical vessel 301 while tilting the ozone absorption tower. The adsorbent 103 is filled to a position where it does not clog the piping 309b. A cooling coil 313 is disposed in the hollow space between the bottom plates 304b1 and 304b2, extending in the radial direction of the cylindrical vessel 301. The cooling coil 313 penetrates the header 304b to the outside of the cylindrical vessel 301 and is connected to the refrigerator 312. The penetration is sealed.

[0025] The cooling coil 313 has the same configuration as the cooling coil 213 described in the first embodiment and is typically wound into a coil to increase its surface area. However, the shape is not limited to a coil, and it may be linear, spiral, or U-shaped. Since the refrigerant supplied from the refrigerator 312 circulates within the pipe, both ends of the cooling coil 313 are connected to the refrigerator 312. The refrigerant introduced from one end circulates within the cooling coil 313, cooling the adsorbent 103 around the cooling pipe 302 into which the cooling coil 313 is inserted, and then returns to the refrigerator 312 from the other end. The cooling coil 313 from the header 304b to the refrigerator 212 is covered with a heat insulating member 111 to suppress heat radiation from the cooling coil 313. In the arrangement of the cooling coils 313, if the outgoing path is from the refrigerator 312 to the bottom inside the cylindrical container 301 and the returning path is from the bottom back to the refrigerator 312, the multiple cooling coils 313 are formed by one cooling coil for each of the outgoing path and the returning path, and the cooling coils for the outgoing path and the returning path are connected to form a loop. The cooling coils 313 for the outgoing path and the returning path are inserted into the same cooling pipe 302. Note that the outgoing path and the returning path may be formed by one cooling coil.

[0026] In this manner, the cooling coils 313 formed in loops inserted into the respective cooling pipes 302 may be connected to the refrigerators 312, respectively. Alternatively, there may be one forward and one backward cooling coil 313 from the refrigerators 312 to the through-holes of the header 304b, but the forward cooling coil 313 may branch into multiple coils at the portion inserted into the header 304b (the space between the bottom plates 304b2 and 304b1) and be inserted into the cooling pipes 302, and the backward cooling coils 313 exiting the cooling pipes 302 may be integrated and insulated within the header 304b (the space between the bottom plates 304b2 and 304b1). In this case, the integrated cooling coils 313 are covered with the insulating member 111. Covering the cooling coils 313 from the header 304b to the refrigerators 312 with the insulating member 111 suppresses heat radiation from the cooling coils 313.

[0027] Pipes 309a and 309b pass through the side of cylindrical container 301, and the passages are sealed. Ozone gas 105 generated from an ozone generator (not shown) is introduced through pipe 309a, passes through adsorbent 103 filled between cylindrical container 301 and cooling pipe 302, and is discharged through pipe 309b. With this configuration, brine introduced into cooling pipe 302 from brine filling port 306a and ozone gas 105 passing between cooling pipe 302 do not come into direct contact with each other.

[0028] 5 is a cross-sectional view taken along the line BB in FIG. 4. As shown in FIG. 5(a), the cooling pipes 302 are arranged in parallel at equal intervals so that their positions are uniform within the cylindrical container 301, and one or more cooling coils 313 are inserted into each cooling pipe 302, one for the outward path and one for the return path. FIG. 5(a) shows an example in which one cooling coil 313 is inserted into each cooling pipe 302, but multiple cooling coils 313 may be inserted into one cooling pipe 302 as long as the diameter of the cooling coil 313 is approximately half the diameter of the cooling pipe 302 or less. Furthermore, it is desirable that cooling coils 313 are inserted into all of the multiple cooling pipes 302 as shown in FIG. 5(a), but the cooling coils 313 may be thinned out so as not to impair uniformity, as shown in FIGS. 5(b) and 5(c).

[0029] The operation of the ozone adsorption tower 30 configured as above will now be described. The space surrounded by the cooling pipe 302 and the cylindrical container 301 is filled with the adsorbent 103, and a refrigerant is circulated from a refrigerator 312 through a cooling coil 313 in the cooling pipe 302. In addition, cooling brine is introduced into the cooling pipe 302 from a brine charging port 306a of a header 304b. The brine charging port 306a is normally closed and is opened when the cooling brine is introduced. The cooling brine supplied from the brine charging port 306a is cooled by the cooling coil 313 in the cooling pipe 302. The cooling brine remains inside the cooling pipe 302 and indirectly cools the adsorbent 103 by thermal convection or natural convection.

[0030] Ozone gas 105 is introduced through pipe 309a and supplied to the adsorbent 103. The ozone in the supplied ozone gas 105 is adsorbed into the adsorbent 103, which is cooled by the cooling coil 313 and the cooling brine in the cooling pipe 302, and the gas that is not adsorbed into the adsorbent 103 is discharged through pipe 309b.

[0031] As described above, in the configuration of the second embodiment, as in the first embodiment, the cooling coils 313 arranged in parallel at equal intervals within the cylindrical vessel 301 reduce the amount of heat dissipation from the refrigerator 312 to the ozone adsorption tower 30 compared to the comparative example, thereby reducing the cost required for insulating the piping. Furthermore, since a secondary refrigerant circulation pipe between the refrigerator 312 and the ozone adsorption tower 30 is not required, the overall system size is reduced. Furthermore, the cooling coils 313 inserted within the cooling pipe 302 within the ozone adsorption tower 30 not only cool the adsorbent 103 around the cooling pipe 302, but also cool the portion of the cooling pipe 302 without the cooling coils 313 due to convection within the cooling pipe 302 of the cooling brine cooled by the cooling coils 313. As a result, the entire adsorbent 103 present between the cooling pipe 302 and the cylindrical vessel 301 is cooled. This allows the insertion length of the cooling coils 313 within the cylindrical vessel to be shorter than that of the first embodiment.

[0032] Embodiment 3 FIG. 6 is a diagram illustrating the configuration of an ozone adsorption tower according to a third embodiment. The ozone adsorption tower 40 has a cylindrical container 401 with a plurality of cooling pipes 402 arranged in parallel inside, and the space inside the cylindrical container 401 other than the plurality of cooling pipes 402 is filled with an adsorbent 103 such as silica gel. The adsorbent 103 may be supplied through a supply port provided on the side of the cylindrical container 401, with the adsorbent 103 being added while tilting the ozone adsorption tower 40. The amount of adsorbent 103 to be filled into the cylindrical container 401 is determined in advance. The adsorbent 103 may be filled to a position where it does not clog the pipe 411b. This allows the flow of ozone gas 105 inside the cylindrical container 401 to be uniform.

[0033] Headers 404a and 404b are fitted into the upper and lower openings of the cylindrical container 401. The header 404a has a hollow structure made up of bottom plates 404a1 and 404a2 and a cylindrical side plate, and one open end of the cooling pipe 402 penetrates the bottom plate 404a1 and faces the hollow space. A tubular portion 406a for introducing the cooling brine 107 is formed in the center of the other bottom plate 404a2 of the header 404a. The header 404b fitted into the upper opening of the cylindrical container 401 also has a hollow structure made up of bottom plates 404b1 and 404b2 and a cylindrical side plate, and the other open end of the cooling pipe 402 penetrates the bottom plate 404b1 and faces the hollow space. A tubular portion 406b for discharging the cooling brine 107 is formed in the center of the bottom plate 404b2 facing the outside.

[0034] A cooling coil 413 is disposed in the hollow portion of the header 404a. The cooling coil 413 extends from the tubular portion 406a to the outside of the cylindrical container 401 and is connected to the refrigerator 412, through which a refrigerant is supplied. The cooling coil 413 has the same configuration as the cooling coil 213 described in the first embodiment. However, in this embodiment, since the cooling coil 413 is disposed in the header 404a, the cooling coil 413 may be formed in a circumferential or spiral shape and disposed over the entire radial direction of the hollow portion of the header 404a. The cooling coil 413 may also be disposed in at least one of the tubular portions 406a and 406b. Heat radiation is suppressed by covering the cooling coil 413 from the tubular portion 406a to the refrigerator 412 with a heat insulating member 111. The tubular portion 406b is connected to the tubular portion 406a via a piping 409a, a brine circulation pump 410, and a piping 409b. Therefore, the cooling brine 107 is cooled by the cooling coil in the header 404a and circulates through a circulation path formed by the tubular portion 406a, the cylindrical container 401, the tubular portion 406b, the piping 409a, the brine circulation pump 410, and the piping 409b. The circulation path is covered with a heat insulating member 111.

[0035] Furthermore, pipes 411a and 411b pass through the side of cylindrical container 401, and the passing portions are sealed. Ozone gas 105 generated from an ozone generator (not shown) is introduced through pipe 411a, passes through adsorbent 103 in cylindrical container 301, and is discharged through pipe 411b. With this configuration, cooling brine 107 introduced into cooling pipe 402 and ozone gas 105 passing between cooling pipe 402 do not come into direct contact with each other.

[0036] The operation of the ozone adsorption tower 40 configured as above will now be described. Ozone gas 105 is injected through a pipe 411a into a cylindrical container 401 filled with an adsorbent 103. At the same time, cooling brine 107 is introduced from a tubular portion 406a of a header 404a into cooling pipes 402 arranged in parallel within the adsorbent 103. The cooling brine 107 is cooled by a cooling coil 413 disposed in a hollow portion of the header 404a, diffuses in the hollow portion, and is supplied to the open end of the cooling pipe 402. The supplied cooling brine 107 cools the adsorbent 103 around the cooling pipe 402 by passing through the cooling pipe 402. The cooled adsorbent 103 adsorbs ozone from the ozone gas introduced through a pipe 309a. The cooling brine 107 is discharged from a tubular portion 406b and supplied again to the tubular portion 406a via pipes 409a and 409b. The adsorbent 103 is uniformly cooled to a certain temperature or below by promoting the circulation of the cooling brine 107 with the brine circulation pump 410. The ozone adsorption tower, the tubular portion 406b, and the pipes 409a and 409b are surrounded by a heat insulating member 111 to suppress heat radiation.

[0037] The pipe 409a may be arranged close enough to the cylindrical container 401 so that the cooling brine 107 can cool it. Furthermore, the pipe 409a may be arranged close to the cylindrical container, and a cooling coil 413 may be inserted into this pipe 409a. In this case, the insulating member 111 is not provided between the adjacent cylindrical container 401 and the pipe 409a, but the cylindrical container 401 and the pipe 409a are both covered with the insulating member. To ensure cooling of the cylindrical container 401, it is desirable to arrange the pipe 409a as close as possible to the cylindrical container 401 or in contact with the cylindrical container 401. In this way, the pipe 409a is arranged along the cylindrical container 401 as close as possible to the cylindrical container 401 so that the cooling coil 413 inserted into this pipe 409a can cool the cooling brine 107 and simultaneously cool the side of the cylindrical container 401. This allows the adsorbent 103 in the cylindrical container 401 to be indirectly cooled.

[0038] As described above, in the configuration of the third embodiment, the use of the cooling coil 413 reduces the amount of heat dissipation from the refrigerator 412 to the ozone adsorption tower 40 compared to the comparative example, thereby reducing the cost required for insulating the piping. Furthermore, the need for a secondary refrigerant circulation piping between the refrigerator 412 and the ozone adsorption tower 40 is eliminated, thereby reducing the overall system size. Furthermore, the cooling coil 413 is inserted into the hollow portion of the header 404a, the tubular portion 406a, or a portion of the tubular portion 406b to cool the cooling brine 107. The cooling brine 107 is circulated by the brine circulation pump 410, thereby indirectly cooling the adsorbent 103. This allows the adsorbent 103 to be cooled to a constant temperature or below over a wide area. This allows the length of the cooling coil 413 to be significantly reduced compared to the first and second embodiments.

[0039] Embodiment 4 FIG. 7 is a diagram illustrating the configuration of an ozone adsorption tower according to a fourth embodiment. The ozone adsorption tower 50 has a cylindrical container 501 with a plurality of cooling pipes 502 arranged in parallel at equal intervals inside the cylindrical container 501, and the space inside the cylindrical container 501 other than the plurality of cooling pipes 502 is filled with an adsorbent 103 such as silica gel. The adsorbent may be supplied from a supply port provided on the side of the cylindrical container 501, and the adsorbent 103 may be introduced while tilting the ozone adsorption tower 50. The adsorbent 103 may be filled to a position where it does not clog the pipe 511b. This ensures that the flow of ozone gas 105 inside the cylindrical container 501 is uniform. The amount of adsorbent 103 to be filled inside the cylindrical container 501 is determined in advance.

[0040] Headers 504b and 504a are fitted into the upper and lower openings of cylindrical container 501. Header 504a has a hollow structure made up of bottom plates 504a1 and 504a2 and cylindrical side plates, and one open end of cooling pipe 502 penetrates bottom plate 504a1 and faces the hollow. A tubular portion 506a is formed in the center of the other bottom plate 504a2 of header 504a for introducing primary refrigerant for cooling 113 (hatched arrow in FIG. 7, for example, chlorofluorocarbon gas).

[0041] Similarly, header 504b fitted into the opening at the top of cylindrical container 501 has a hollow structure made up of bottom plates 504b1, 504b2 and cylindrical side plates, and the other open end of cooling pipe 502 penetrates bottom plate 504b1 and faces the hollow part. A tubular part 506b that discharges primary cooling refrigerant 113 is formed in the center of bottom plate 504b2 facing the outside.

[0042] Tubular portion 506b is connected to tubular portion 506a via piping 509a, refrigerator 512, and piping 509b to form a circulation path, which is covered with heat insulating member 111. Primary cooling refrigerant 113 circulates within this circulation path.

[0043] Furthermore, pipes 511a and 511b pass through the side of cylindrical container 501, and the passing portions are sealed. Ozone gas generated from an ozone generator (not shown) is introduced through pipe 511a, passes through adsorbent 103 in cylindrical container 301, and is discharged from pipe 511b. With this configuration, primary cooling refrigerant 113 introduced into cooling pipe 502 and ozone gas 105 passing between cooling pipe 502 do not come into direct contact with each other.

[0044] The operation of the ozone adsorption tower 50 configured in this manner will be described. Ozone gas 105 is injected through pipe 511a into cylindrical container 501 filled with adsorbent 103. Simultaneously, a primary cooling refrigerant is introduced from tubular portion 506a of header 504a into cooling pipes 502 arranged in parallel inside adsorbent 103. Primary cooling refrigerant 113 diffuses in the hollow portion and is supplied to the open end of cooling pipe 502. The supplied primary cooling refrigerant cools the adsorbent 103 around cooling pipe 502 by passing through cooling pipe 502. The cooled adsorbent 103 adsorbs ozone from ozone gas 105 introduced through pipe 511a. Primary cooling refrigerant 113 is supplied again to tubular portion 506a from tubular portion 506b via pipes 509a and 509b. The compressor of refrigerator 512 promotes circulation of the primary cooling refrigerant, thereby promoting cooling of adsorbent 103. Heat radiation is suppressed by surrounding the cylindrical container 501, the tubular portion 506b, and the pipes 509a and 509b with a heat insulating member 111. Such a configuration is functionally the same as introducing an adsorbent into the evaporator of a refrigeration system.

[0045] As described above, in the configuration of the fourth embodiment, the amount of heat radiation from the refrigerator 512 to the ozone adsorption tower 50 can be made smaller than in the comparative example by circulating the cooling primary refrigerant 113 inside the cylindrical container 501 using the compressor in the refrigerator 512, thereby reducing the cost required for insulating the piping. In addition, the need for a secondary refrigerant circulation piping between the refrigerator 512 and the ozone adsorption tower 50 is eliminated, thereby reducing the overall size of the system. Furthermore, the adsorbent 103 is constantly cooled by circulating the cooling primary refrigerant 113 using the refrigerator 512, thereby enabling the adsorbent 103 to be uniformly cooled.

[0046] Embodiment 5. FIG. 8 is a diagram illustrating an ozone adsorption tower according to a fifth embodiment. In the ozone adsorption tower 60, a plurality of tube pipes 602 are arranged in parallel inside a cylindrical container 601, and the tube pipes 602 are filled with an adsorbent 103 such as silica gel. The amount of adsorbent 103 to be filled in the tube pipes 602 is determined in advance. Headers 604a and 604b are fitted into the upper and lower openings of the cylindrical container 601. The header 604a has a hollow structure formed by bottom plates 604a1 and 604a2 and a cylindrical side plate. One open end of the tube pipe 602 penetrates the bottom plate 604a1 and faces the hollow space. The header 604b also has a hollow structure formed by bottom plates 604b1 and 604b2 and a cylindrical side plate. The other open end of the tube pipe 602 penetrates the bottom plate 604b1 and faces the hollow space. Pipe-like portions 606a and 606b for introducing or discharging the ozone gas 105 are formed in the central portions of the bottom plates 604a2 and 604b2 of the headers 604a and 604b.

[0047] Furthermore, pipes 609a and 609b penetrate the side of cylindrical container 601, and the penetration portions are sealed. In this case, pipe 609a penetrates the lower part of cylindrical container 601, and pipe 609b penetrates the upper part of cylindrical container 601. Pipe 609b is connected to pipe 609a via brine circulation pump 610, and a circulation path is formed by pipe 609a, cylindrical container 601, pipe 609b, and brine circulation pump 610. Cooling brine 107 circulates within this circulation path. With this configuration, ozone gas 105 introduced into tube piping 602 and cooling brine 107 passing between tube piping 602 do not come into direct contact with each other.

[0048] A portion of the pipe 609b runs along the cylindrical container 601 and is close enough to cool the cylindrical container 601. To ensure reliable cooling of the cylindrical container 601, it is desirable to arrange the pipe 609b as close as possible to or in contact with the cylindrical container 601. A cooling coil 613 is inserted inside the adjacent pipe 609b. The cooling coil 613 is connected to a refrigerator 612. The cooling coil 613 has the same structure as described in the first embodiment and is usually wound in a coil shape to increase the surface area. However, the shape is not limited to a coil shape and may be linear, spiral, or U-shaped. Since the refrigerant supplied from the refrigerator 612 circulates within the coil, both ends of the cooling coil 613 are connected to the refrigerator 612. The refrigerant introduced from one end circulates within the cooling coil 613 and returns to the refrigerator 612 from the other end. Regarding the arrangement of the cooling coil 613 in the piping 609b, if the section from the refrigerator 612 to the bottom of the cylindrical container 601 is defined as the forward path and the section from the bottom back to the refrigerator 612 is defined as the return path, the cooling coil 613 is formed by one cooling coil for each of the forward and return paths, and the cooling coils for the forward and return paths are connected to form a loop. Note that a single cooling coil may form both the forward and return paths. The cooling coil 613 cools the cooling brine 107 in the circulation path. The cooling coil 613 passes through the piping 609b to connect to the refrigerator 612, so the penetration is sealed. The circulation path from the piping 609a, the cylindrical container 601, the piping 609b, and the brine circulation pump 610 is covered with a heat insulating member 111 to suppress heat radiation. The cooling coil 613 from the cylindrical container 601 to the refrigerator 612 is also covered with a heat insulating member 111 to suppress heat radiation.

[0049] The operation of the ozone adsorption tower 60 configured in this manner will be described. Ozone gas 105 is injected into tube piping 602 filled with adsorbent 103. Simultaneously, cooling brine 107 is circulated through the gaps between the tube piping 602 arranged in parallel inside the cylindrical container 601. The cooling brine 107 is cooled by a cooling coil 613 in the circulation path, and the circulation of the cooling brine 107 is promoted by a brine circulation pump 610. While the cooling brine 107 is circulating, ozone gas 105 from an ozone generator (not shown) is introduced into the tubular portion 606a. The introduced ozone gas 105 diffuses in the hollow portion of the header 604a and is supplied to each open end of the multiple tube piping 602. The ozone in the supplied ozone gas 105 is adsorbed by the adsorbent 103 filled in each tube piping 602. The gas not adsorbed by the adsorbent 103 is collected in the hollow portion of the header 604b and discharged from the tubular portion 606b.

[0050] The piping 609b is arranged along the cylindrical container 601 as close as possible to the cylindrical container 601 so that the cooling coil 613 inserted in this piping 609b can cool the cooling brine 107 and simultaneously cool the side of the cylindrical container 601. This allows the adsorbent 103 packed in the tube piping 602 inside the cylindrical container 601 to be indirectly cooled.

[0051] As described above, in the configuration of the fifth embodiment, as in the first embodiment, the use of the cooling coil 613 reduces the amount of heat dissipation from the refrigerator 612 to the ozone adsorption tower 60 compared to the comparative example, thereby reducing the cost required for insulating the piping. Furthermore, since a secondary refrigerant circulation piping between the refrigerator 612 and the ozone adsorption tower 60 is not required, the overall system size is reduced. Furthermore, the cooling coil 613 inserted in the piping 609b in the ozone adsorption tower 60 can cool the cooling brine 107 circulating within the cylindrical container 601 and also cool the side of the cylindrical container 601. This allows the adsorbent 103 packed in the tube piping 602 within the cylindrical container 601 to be indirectly cooled. Furthermore, by arranging the cooling coil 613 in the circulation path of the cooling brine 107, it is not necessary to place the cooling coil 613 within the cylindrical container 601, and the length of the cooling coil 613 used can be shortened compared to the first and second embodiments.

[0052] Embodiment 6 FIG. 9 is a diagram illustrating an ozone adsorption tower according to a sixth embodiment. In the ozone adsorption tower 70, a plurality of tube pipes 702 are arranged in parallel inside a cylindrical vessel 701, and the tube pipes 702 are filled with an adsorbent 103, such as silica gel. Header pipes 704b and 704a are fitted into the upper and lower openings of the cylindrical vessel 701. The header 704a has a hollow structure composed of a bottom plate 704a1, a bottom plate 704a2, and a cylindrical side plate. One open end of the tube pipe 702 penetrates the bottom plate 704a1 and faces the hollow space. A tubular portion 706a for introducing ozone gas 105 is formed in the center of the bottom plate 704a2 of the header 704a. A brine filling port 709a for introducing cooling brine into the cylindrical vessel 701 is formed in the side of the cylindrical vessel 701. Considering the gravity of the cooling brine, the brine filling port 709a is preferably provided in the upper part of the cylindrical vessel 701.

[0053] Header 704b fitted into the opening at the top of cylindrical container 701 has a hollow structure made up of bottom plate 704b2 and bottom plate 704b1 facing the outside, and a cylindrical side plate, and the other open end of tube piping 702 penetrates bottom plate 704b1 and faces the hollow space. Cooling coil 713 is disposed in the hollow space between bottom plates 704b1 and 704b2, extending in the radial direction of cylindrical container 701. Cooling coil 713 penetrates header 704b to the outside of cylindrical container 701 and is connected to refrigerator 712. The penetration part is sealed.

[0054] Cooling coil 713 is the same as that described in embodiment 1, and is usually wound in a coil shape to increase the surface area. However, the shape is not limited to a coil shape, and it may be linear, spiral, or U-shaped. Both ends of cooling coil 713 are connected to refrigerator 712, and the refrigerant introduced from one end circulates within cooling coil 713, cooling tube piping 702, and then returns to refrigerator 712 from the other end.

[0055] In the arrangement of cooling coils 713, if the outgoing path is from refrigerator 712 to the bottom inside cylindrical container 701 and the returning path is from the bottom back to refrigerator 712, then the multiple cooling coils 713 are formed by one cooling coil for each of the outgoing path and the returning path, and the cooling coils for the outgoing path and the returning path are connected to form a loop. Note that the outgoing path and the returning path may be formed by one cooling coil.

[0056] A plurality of cooling coils 713 forming such a loop may be arranged along the tube piping 702. At the portion where the cooling coil 713 is inserted into the header 704b (the space between the bottom plate 704b2 and the bottom plate 704b1), the outgoing cooling coil 713 may branch into a plurality of parts and be inserted into the cooling pipe 702, and the return cooling coils 713 discharged from the cooling pipe 702 may be integrated in the header 704b (the space between the bottom plate 704b2 and the bottom plate 704b1).

[0057] A brine filling port 709a penetrates the side of the cylindrical container 701, and the penetration is sealed. Cooling brine 107 is introduced through the brine filling port 709a. Heat radiation is suppressed by covering the cooling coil 713 from the header 704b to the refrigerator 712, the brine filling port 709a, the cylindrical container 701, and the headers 704a and 704b with a heat insulating member 111. With this configuration, the cooling brine introduced into the cylindrical container 701 from the brine filling port 709a and the ozone gas 105 passing through the tube piping 702 do not come into direct contact with each other.

[0058] The operation of the ozone adsorption tower 70 configured in this manner will be described. The tube piping 702 is filled with the adsorbent 103, and a refrigerant is circulated from a refrigerator 712 through a cooling coil 713 arranged along the tube piping 702. In addition, cooling brine is introduced into the cylindrical container 701 through a brine filling port 709a. The brine filling port 709a is normally closed and is opened when the cooling brine is introduced. The cooling brine supplied from the brine filling port 709a is cooled by the cooling coil 713 inside the cylindrical container 701. The cooling brine remains inside the cylindrical container 701 and indirectly cools the adsorbent 103 in the tube piping 702 by thermal convection or natural convection.

[0059] Ozone gas 105 is introduced from tubular portion 706a, diffuses in the hollow portion of header 704a, and is supplied to each open end of the plurality of tube piping 702. Then, ozone is adsorbed by cooled adsorbent 103 in tube piping 702, and gas that is not adsorbed by adsorbent 103 is discharged from tubular portion 706b.

[0060] As described above, in the configuration of the sixth embodiment, as in the first embodiment, the use of the cooling coil 713 reduces the amount of heat dissipation from the refrigerator 712 to the ozone adsorption tower 70 compared to the comparative example, thereby reducing the cost required for insulating the piping. Furthermore, the need for a secondary refrigerant circulation piping between the refrigerator 712 and the ozone adsorption tower 70 is eliminated, thereby reducing the overall system size. Furthermore, the cooling coil 713 inserted in the ozone adsorption tower 70 indirectly cools the adsorbent 103 in the tube piping 702 and also cools the cooling brine 107 accumulating in the cylindrical container 701. This allows not only the adsorbent 103 in the tube piping 702 along the cooling coil 713 but also the entire tube piping 702 inside the cylindrical container 701 to be cooled, thereby enabling the adsorbent 103 in the tube piping 702 to be uniformly cooled. Furthermore, the use of the cooling brine allows the insertion length of the cooling coil 713 into the cylindrical container 701 to be shortened.

[0061] Although the present disclosure describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments are not limited to application to a particular embodiment, but may be applied to the embodiments alone or in various combinations. Therefore, countless variations not exemplified are conceivable within the scope of the technology disclosed in the specification, including, for example, cases where at least one component is modified, added, or omitted, and cases where at least one component is extracted and combined with components of another embodiment. [Explanation of symbols]

[0062] 10, 20, 30, 40, 50, 60, 70: ozone absorption tower, 101, 201, 301, 401, 501, 601, 701: cylindrical container, 102, 602, 702: tubing, 103: adsorbent, 104a, 104b, 204a, 204b, 304a, 304b, 404a, 404b, 504a, 504b, 604a, 604b, 704a, 704b: Header, 104a1, 104b1, 104a2, 104b2, 204a1, 204a2, 204b2, 304a1, 304a2, , 304b1, 304b2, 404a1, 404a2, 404b1, 404b2, 504a1, 504a2, 504b1, 504b2, 604a1, 604a2, 604b1, 604b2, 704a1, 704a2, 70 4b1, 704b2: bottom plate, 105: ozone gas, 106a, 106b, 206a, 206b, 406a, 406b, 506a, 506b, 606a, 606b, 706a, 706b: tubular portion, 107: cooling brine, 109a, 109b, 209b: piping, 110: pump, 111: heat insulating member, 112, 212, 312, 412, 512, 612, 712: Refrigerator, 213, 313, 413, 613, 713: Cooling coil, 302, 402, 502, 702: Cooling pipe, 309a, 309b, 409a, 409b: Piping, 411a, 411b: Piping, 509a, 509b, 511a, 511b, 609a, 609b: Piping, 410, 610: Brine circulation pump, 306a, 709a: Brine filling port.

Claims

1. an ozone adsorption tower comprising: a cylindrical container; a first header fitted into an opening on one end of the cylindrical container and supplying ozone gas to the cylindrical container; an adsorbent filled in a predetermined space of the cylindrical container and adsorbing the supplied ozone gas; a plurality of cooling coils inserted evenly and in parallel into the adsorbent; a refrigerator connected to both ends of the cooling coils led to the outside of the cylindrical container, the refrigerator cooling a refrigerant discharged from one end and supplying the refrigerant to the cooling coils inside the cylindrical container from the other end, thereby circulating the refrigerant through the plurality of cooling coils; and a second header fitted into an opening on the other end of the cylindrical container and discharging the ozone gas that has not been adsorbed by the adsorbent from the cylindrical container.

2. a cylindrical container; a first header fitted to an opening on one end side of the cylindrical container and supplying ozone gas to tube piping arranged in parallel inside the cylindrical container; an adsorbent filled in the tube piping and adsorbing the ozone gas; a second header fitted to an opening on the other end side of the cylindrical container and collecting the ozone gas from the tube piping that has not been adsorbed by the adsorbent and discharging it to the outside of the cylindrical container; a first pipe connected to a side of one end of the cylindrical container and introducing a first refrigerant into the cylindrical container; a second pipe connected to a side of the other end of the cylindrical container and discharging the first refrigerant from the cylindrical container; an ozone adsorption tower comprising: a pump connected to a pipe and forming a circulation path for the first refrigerant together with the first pipe, the cylindrical container, and the second pipe; a cooling coil inserted in the second pipe; and a refrigerator connected to both ends of the cooling coil and configured to cool a second refrigerant discharged from one end and supply the second refrigerant from the other end to the cooling coil, thereby circulating the second refrigerant through the cooling coil, wherein the second pipe is arranged along the cylindrical container in close proximity to the cylindrical container so that the cooling coil can cool the cylindrical container, and the cooling coil cools the first refrigerant in the second pipe and also cools the cylindrical container.

3. an ozone adsorption tower comprising: a cylindrical container; a first header fitted into an opening on one end of the cylindrical container and supplying ozone gas to tube piping arranged in parallel within the cylindrical container; an adsorbent filled in the tube piping and adsorbing the ozone gas; a second header fitted into an opening on the other end of the cylindrical container and discharging the ozone gas from the tube piping that has not been adsorbed by the adsorbent to the outside of the cylindrical container; piping for introducing a first refrigerant into the cylindrical container; a plurality of cooling coils arranged within the cylindrical container along the tube piping; and a refrigerator connected to both ends of the cooling coils that are led to the outside of the cylindrical container, the refrigerator cooling a second refrigerant discharged from one end and supplying the second refrigerant to the cooling coils within the cylindrical container from the other end, thereby circulating the second refrigerant through the plurality of cooling coils;

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