Spray nozzle and spraying method
阅读说明:本技术 喷雾喷嘴及喷雾方法 (Spray nozzle and spraying method ) 是由 大久保雅章 黑木智之 藤岛英胜 平松弘树 中井志郎 山本柱 辻良太 于 2018-12-25 设计创作,主要内容包括:本发明提供一种可以抑制氧化剂气体热分解、可以利用氧化剂气体高效地对被处理气体进行氧化处理的喷雾喷嘴。本发明的喷雾喷嘴,其特征在于,其具备:设置在第一管的端部的第一喷出孔,以及以包围第一管的方式设置的第二喷出孔,第二喷出孔以水或水溶液与喷雾用气体一起一边旋转一边从第二喷出孔喷出的方式设置,第一喷出孔以向从第二喷出孔喷出的含有水或水溶液的雾中供给从第一喷出孔喷出的氧化剂气体的方式设置。(The invention provides a spray nozzle which can inhibit thermal decomposition of an oxidant gas and can efficiently oxidize a gas to be treated with the oxidant gas. The spray nozzle of the present invention is characterized by comprising: the first ejection hole is provided at an end portion of the first pipe, and the second ejection hole is provided so as to surround the first pipe, the second ejection hole is provided so that water or an aqueous solution is ejected from the second ejection hole while rotating together with the atomizing gas, and the first ejection hole is provided so that the oxidizing gas ejected from the first ejection hole is supplied to the mist containing water or an aqueous solution ejected from the second ejection hole.)
1. A spray nozzle comprising a first discharge hole provided at an end of a first pipe and a second discharge hole provided so as to surround the first pipe,
the second jetting hole is provided in such a manner that water or an aqueous solution is jetted from the second jetting hole while rotating together with the atomizing gas,
the first ejection hole is provided so as to supply the oxidizing gas ejected from the first ejection hole into the mist containing water or the aqueous solution ejected from the second ejection hole.
2. The spray nozzle according to claim 1, wherein the second ejection hole has a circular ring shape.
3. The spray nozzle according to claim 1 or 2, further comprising a second pipe, a third pipe, and a communication flow path,
the first tube, the second tube, and the third tube have a structure in which the first tube is located inside the second tube and the second tube is located inside the third tube,
the communication flow path is provided so as to communicate a flow path between the first pipe and the second pipe with a flow path between the second pipe and the third pipe,
the inner flow path of the first tube is an oxidant gas flow path through which oxidant gas flows,
the flow path between the second pipe and the third pipe is a gas flow path through which the atomizing gas flows,
the flow path between the first pipe and the second pipe includes a water flow path through which water or an aqueous solution flows and a gas-liquid mixing portion,
the gas-liquid mixing section is provided so as to generate a swirling flow while mixing water or an aqueous solution supplied from the water flow path with the atomizing gas blown in from the communication flow path,
the second discharge hole is provided so that the rotating gas-liquid mixture formed by the gas-liquid mixing portion is discharged from the second discharge hole.
4. The spray nozzle according to claim 3, further comprising a swirling flow forming portion,
the swirling flow forming portion is provided so as to form a swirling flow in the water or aqueous solution flowing in the water flow path,
the gas-liquid mixing section is provided so as to form a swirling flow having the same direction of rotation as the swirling flow formed by the swirling-flow forming section.
5. The spray nozzle according to any one of claims 1 to 4, wherein the first ejection hole and the second ejection hole are arranged on the same plane or are arranged to protrude in the ejection direction from the second ejection hole.
6. The spray nozzle according to any one of claims 1 to 4, wherein the second ejection hole has a circular ring shape,
the outer wall of the second discharge hole is provided so as to protrude in the discharge direction from the first discharge hole.
7. The spray nozzle according to claim 6, wherein the first ejection hole is provided so that the oxidizing gas ejected from the first ejection hole is supplied into the mist outside the spray nozzle.
8. The spray nozzle according to claim 6 or 7, wherein a distance between a front end of the outer wall of the second ejection hole and the first ejection hole is greater than 0mm and less than 2 mm.
9. The spray nozzle according to any one of claims 1 to 8, further provided with an air discharge hole,
the air discharge hole is provided to discharge air from the air discharge hole to the outside of the spray nozzle, and the air discharge hole is provided to surround a flow path or a second ejection hole through which water, an aqueous solution, or a spray gas is supplied to the second ejection hole.
10. A spray nozzle according to any one of claims 1 to 9 wherein the oxidant gas is an ozone containing gas.
11. A method of spraying comprising the steps of: forming mist in the gas to be treated by jetting water or an aqueous solution from the second jetting hole while rotating together with the gas for spraying into the gas to be treated flowing through the gas to be treated flow path in which the spray nozzle according to any one of claims 1 to 10 is installed, and feeding the oxidizing gas into the mist by jetting the oxidizing gas from the first jetting hole.
12. The spraying method according to claim 11, wherein the gas to be treated is an exhaust gas containing NOx,
the oxidant gas is an ozone-containing gas.
Technical Field
The present invention relates to a spray nozzle and a spraying method.
Background
In the case where the gas to be treated is subjected to the oxidation treatment by the oxidizing gas having a chemical property of thermal decomposition, the treatment is performed after the gas to be treated is cooled to a temperature equal to or lower than the thermal decomposition temperature.
For example, an exhaust gas treatment method is known in which a combustion exhaust gas is treated with an ozone gas having a chemical property of thermally decomposing at a temperature of 150 ℃. In this method, the combustion exhaust gas is purified by supplying ozone gas to the combustion exhaust gas sufficiently cooled in the shower chamber. In this method, a large-scale cooling device is required for cooling the combustion exhaust gas.
Further, an exhaust gas treatment method is known in which a combustion exhaust gas is treated with an ozone gas in a local cooling region by mist (for example, see patent document 2). In this method, since only the local cooling region of the mist is cooled to a temperature equal to or lower than the thermal decomposition temperature of the ozone gas, and the combustion exhaust gas is treated with the ozone gas, a large-scale cooling device is not required.
Disclosure of Invention
However, when the oxidizing gas is used to oxidize the gas to be treated in the local cooling area using the mist, the oxidizing gas diffuses to the outside of the local cooling area and is thermally decomposed, and therefore it is difficult to efficiently oxidize the gas to be treated.
The present invention has been made in view of the above circumstances, and provides a spray nozzle which can suppress thermal decomposition of an oxidizing gas and can efficiently oxidize a gas to be treated with the oxidizing gas.
The present invention provides a spray nozzle, comprising: the second ejection hole is provided so that water or an aqueous solution is ejected from the second ejection hole while rotating together with the atomizing gas, and the first ejection hole is provided so that the oxidizing gas ejected from the first ejection hole is supplied to the mist containing water or the aqueous solution ejected from the second ejection hole.
The spray nozzle of the present invention has a second discharge hole provided so that water or an aqueous solution is discharged while rotating together with a gas for spraying. By spraying water or an aqueous solution and a spraying gas in a two-fluid manner from the second discharge hole, mist having a swirling flow can be formed. In addition, a local cooling region can be formed in the mist by using vaporization heat of water or an aqueous solution.
The spray nozzle of the present invention includes a first discharge hole provided at an end of a first pipe. The first ejection hole is provided so as to supply the oxidizing gas ejected from the first ejection hole into the mist containing water or the aqueous solution ejected from the second ejection hole. By ejecting the oxidizing gas from the first ejection hole, the oxidizing gas can be supplied to the vicinity of the rotating shaft of the mist having the swirling flow.
The swirling flow formed in the mist is an air flow that flows in the ejection direction while rotating around a rotation axis, and has a velocity component in the ejection direction and a velocity component in the rotation direction. Therefore, it is considered that the oxidizing gas supplied from the first discharge hole to the vicinity of the rotation axis flows in the discharge direction in the vicinity of the rotation axis of the swirling flow. The gas to be treated outside the mist is entrained in the gas flow around the outer periphery of the swirling flow, and is considered to be cooled by the heat of vaporization of the mist while flowing along the swirling flow. It is considered that the cooled gas to be treated is oxidized by being brought into contact with the oxidizing gas in the mist.
Therefore, by using the spray nozzle of the present invention, thermal decomposition of the oxidizing gas can be suppressed, and the gas to be treated can be effectively oxidized by the oxidizing gas.
Drawings
Fig. 1 is a schematic sectional view of a spray nozzle according to an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view of the spray nozzle in a range a surrounded by a broken line in fig. 1.
Fig. 3 is a schematic end view of the spray nozzle as viewed from the direction indicated by the arrow B in fig. 2.
Fig. 4 (a) is a schematic sectional view of the spray nozzle at a broken line C-C of fig. 2, and fig. 4 (b) is a schematic sectional view of the spray nozzle at a broken line D-D of fig. 2.
Fig. 5 (a) is an enlarged end view of a range E surrounded by a broken line in fig. 3, and (b) to (d) are schematic end views of the spray nozzle of the modification.
Fig. 6 is a schematic partial sectional view of a spray nozzle according to an embodiment of the present invention.
Fig. 7 is a schematic partial sectional view of a spray nozzle according to an embodiment of the present invention.
Fig. 8 is a conceptual diagram of a method for treating a gas to be treated by using a spray nozzle according to an embodiment of the present invention.
Fig. 9 is a schematic configuration diagram of an exhaust gas treatment device incorporating a spray nozzle according to an embodiment of the present invention.
Fig. 10 is an explanatory view showing measurement positions of the average flow velocity of mist in the first mist test.
Fig. 11 is a graph showing the supply pressure difference of the gas containing ozone when the gas-liquid mixture and the gas containing ozone are ejected from the spray nozzles at different positions on the distal end of the ozone tube.
Fig. 12 is a graph showing the rate of change in the sauter mean particle diameter of droplets contained in a mist formed by ejecting a gas-liquid mixture and an ozone-containing gas from spray nozzles at different positions at the distal end of an ozone tube.
Detailed Description
The spray nozzle of the present invention is characterized by comprising: the first ejection hole is provided at an end portion of the first pipe, and the second ejection hole is provided so as to surround the first pipe, the second ejection hole is provided so that water or an aqueous solution is ejected from the second ejection hole while rotating together with the atomizing gas, and the first ejection hole is provided so that the oxidizing gas ejected from the first ejection hole is supplied to the mist containing water or an aqueous solution ejected from the second ejection hole.
The second ejection hole included in the spray nozzle of the present invention preferably has a circular ring shape. This can increase the velocity component in the rotational direction of the swirling flow of the mist, and can suppress the oxidizing gas discharged from the first discharge hole from diffusing to the outside of the mist and thermally decomposing.
The first tube, the second tube, and the third tube included in the spray nozzle of the present invention preferably have a structure in which the first tube is located inside the second tube and the second tube is located inside the third tube. Preferably, the communication flow path included in the spray nozzle of the present invention is provided to communicate the flow path between the first tube and the second tube and the flow path between the second tube and the third tube, and the internal flow path of the first tube is an oxidizing gas flow path through which the oxidizing gas flows. The flow path between the second tube and the third tube is preferably a gas flow path through which the atomizing gas flows, and the flow path between the first tube and the second tube preferably includes a water flow path through which water or an aqueous solution flows and a gas-liquid mixing section. The gas-liquid mixing section is preferably provided so as to generate a swirling flow while mixing the water or aqueous solution supplied from the water flow path and the atomizing gas blown in from the communication flow path, and the second ejection hole is preferably provided so as to eject a swirling gas-liquid mixture formed by the gas-liquid mixing section from the second ejection hole. With this configuration, the mist can be formed by jetting the water or the aqueous solution from the second jetting hole while rotating together with the atomizing gas, and the oxidizing gas can be supplied to the mist from the first jetting hole.
The spray nozzle of the present invention preferably includes a swirling flow forming portion. Preferably, the swirling flow forming portion is provided in such a manner as to form a swirling flow in the water or aqueous solution flowing in the water flow path, and preferably, the gas-liquid mixing portion is provided in such a manner as to form a swirling flow having the same direction of rotation as that of the swirling flow formed by the swirling flow forming portion. Thus, water or an aqueous solution having a swirling flow can be supplied from the water flow path to the gas-liquid mixing section, and the rotational speed of the swirling flow of the gas-liquid mixture formed by the gas-liquid mixing section can be increased. As a result, the plurality of water droplets jetted from the second jetting hole can be further miniaturized. In addition, the rotation speed of the swirling flow of the mist can be increased.
The first discharge hole included in the spray nozzle of the present invention is preferably arranged on the same plane as the second discharge hole, or preferably arranged to protrude in the discharge direction from the second discharge hole. This makes it possible to supply the oxidizing gas to the vicinity of the rotation axis of the mist, and to suppress thermal decomposition due to diffusion of the oxidizing gas to the outside of the mist.
The spray nozzle of the present invention preferably includes an air discharge hole which is preferably provided so as to surround the second ejection hole or the flow path through which water, an aqueous solution, or a gas for spraying is supplied to the second ejection hole, and which discharges air from the air discharge hole to the outside of the spray nozzle. By discharging the air from the air discharge hole, the air can be supplied to the outer periphery of the swirling flow of the mist and the periphery thereof. Thereby, the air supplied from the air discharge hole is mixed with the gas to be processed around the swirling flow of the mist, and the gas to be processed is cooled. Therefore, thermal decomposition of the oxidant gas in the mist can be suppressed.
The oxidant gas is preferably an ozone-containing gas. Since ozone has a strong oxidizing property, it can oxidize a gas contained in a gas to be treated.
The invention also provides a spraying method, which comprises the following steps: the mist is formed in the gas to be treated by jetting water or an aqueous solution from the second jetting holes while rotating together with the atomizing gas into the gas to be treated flowing through the gas to be treated flow path to which the spray nozzle of the present invention is attached, and the oxidizing gas is jetted from the first jetting holes to supply the oxidizing gas into the mist. The spraying method of the present invention can suppress thermal decomposition of the oxidizing gas and can efficiently oxidize the gas to be treated with the oxidizing gas.
In the spraying method of the present invention, it is preferable that the water or the aqueous solution and the spraying gas are sprayed from the second spray hole at an initial velocity of 30m/s to 340 m/s. The gas to be treated is preferably an exhaust gas containing NOx, and the oxidizing gas is preferably a gas containing ozone.
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The structures shown in the drawings and described below are merely examples, and the scope of the present invention is not limited to the structures shown in the drawings and described below.
Fig. 1 to 8 are views related to the spray nozzle of the present embodiment. The description of the drawings is the same as that described above.
The
The spraying method of the present embodiment includes the steps of: in the gas to be treated flowing through the gas flow path 21 to which the
The mist is a substance in which a plurality of water droplets 23 float in the gas. The water droplets 23 contained in the mist may have an average particle diameter of 100 μm or less.
The
The
The
The oxidizing gas is not particularly limited as long as it functions as an oxidizing agent, and is, for example, an ozone-containing gas. In the case where the oxidant gas is an ozone-containing gas, the oxidant
The
For example, water or an aqueous solution supplied from the
The
The
The initial velocity of the water or aqueous solution and the atomizing gas ejected from the
The
The
The
In the gas-
The
The plurality of
The
The
The swirling flow formed in the
The exhaust gas to be treated is not particularly limited as long as it is a gas oxidized by the oxidant gas, and may be, for example, a combustion exhaust gas containing NOx. In this case, the oxidant gas may be an ozone-containing gas. The exhaust gas to be treated may contain NOx and SOx.
Ozone gas has a strong oxidizing property and functions as an oxidizing agent. Therefore, by mixing the combustion exhaust gas containing NOx with the ozone gas, the NO gas which is hardly soluble in water and is contained in the combustion exhaust gas can be oxidized into NO which is easily reacted with water and the reducing agent2A gas. In addition, NO in the combustion exhaust gas2The gas may be removed by a reducing agent or the like. Thus, the NO gas is treated with ozone gasThe oxidation treatment may be used for removal treatment of NOx in the combustion exhaust gas.
However, ozone gas has thermal decomposition properties, and when it exceeds 150 ℃, the thermal decomposition rate increases. Therefore, the oxidation treatment of the combustion exhaust gas with ozone gas needs to be performed at a temperature of 150 ℃ or lower.
When the
The
The
The
Even when the first discharge holes 3 (the distal ends of the first pipes 4) are arranged inside the nozzle with respect to the discharge surface, the first discharge holes 3 may be arranged such that the oxidizing gas discharged from the first discharge holes 3 is supplied to the
For example, as in the
The
The swirling
The
The
The
Fig. 9 is a schematic configuration diagram of an exhaust gas treatment device 80 incorporating the
The
The plurality of
The exhaust gas treatment device 80 may include a spray nozzle 67, and the spray nozzle 67 may be provided to form the second mist 47 by spraying the aqueous solution 72 in which at least NaOH is dissolved in the exhaust gas on the downstream side of the
Since the exhaust gas flowing in the exhaust gas flow path 45 contains SO2The fine water droplets contained in the second mist 47 contain NaOH, and the chemical reaction represented by the following formula (1) can be performed in the second mist 47. Therefore, SO contained in the exhaust gas can be removed2(desulfurization of the exhaust gas is possible), and Na as a reducing agent can be generated in the minute liquid droplets of the second mist 472SO3。
SO2+2NaOH→Na2SO3+H2O···(1)
In addition, the exhaust gas flowing through the exhaust gas flow path 45 contains NO generated by oxidation of NO by ozone2The gas-liquid reaction shown in the following formula (2) can be carried out.
2NO2+4Na2SO3→N2+4Na2SO4···(2)
Therefore, NO can be mixed in the second mist 472Reduction to N2NOx in the exhaust gas can be removed. Since the chemical reactions of the formulae (1) and (2) are considered to proceed in the fine water droplets of the second mist 47 or in the gas-liquid interface between the fine water droplets and the exhaust gas, the time during which the fine water droplets are present can be set to a time (which takes about 1 second) or longer necessary for these chemical reactions to proceed.
With the progress of the chemical reaction of formula (2), with the presence of a reducing agent Na2SO3Generation of Na2SO4And Na is produced in the exhaust gas2SO4And (3) dust.
Spray nozzle 67 may also have NaOH and a reducing agent (e.g., Na) dissolved therein2SO3) The mixed aqueous solution of (2) is sprayed into the exhaust gas. In this case, NO in the exhaust gas can be reduced by the use of the reducing agent2Reduction to N2Therefore, the exhaust gas containing no SOx or the exhaust gas having a sufficiently low SOx concentration can also flow in the exhaust gas flow path 45. In addition, only Na generated by SOx in the exhaust gas passes through2SO3NO can be converted to2Fully reduced to N2In the case of (3), a spray nozzle 67 may be provided to spray a mixed aqueous solution in which NaOH and a reducing agent are dissolved.
The spray nozzle 67 may spray the NaOH aqueous solution 72 into the exhaust gas from which the
As in the exhaust gas treatment device 80 shown in fig. 9, in the case where the
The exhaust gas treatment device 80 may include a dust collector 43 on the downstream side of the
Experiment of waste gas treatment
The exhaust gas discharged from the glass melting furnace was treated by an exhaust gas treatment apparatus shown in FIG. 9. In addition, the
7
[ Table 1]
Total amount of cooling water
0.46m3/h
0.78m3/h
0.80m3/h
Number of
7 root of
7 root of
7 root of Chinese goldthread
Amount of water per nozzle
66L/h
112L/h
114L/h
Water pressure
0.12MPa
0.14MPa
0.14MPa
Air pressure (for spraying)
0.16MPa
0.17MPa
0.20MPa
Amount of ozone injected
About 36mol/h
About 36mol/h
About 36mol/h
A 2% NaOH aqueous solution (containing no reducing agent) was sprayed into the exhaust gas flowing through the reaction tower by 7 spray nozzles 67 provided at equal intervals on the inner periphery of the reaction tower on the downstream side of the
In addition, the spraying of the spray nozzle 68 is not performed. In addition, the dust collector uses an electric dust collector.
The results of measuring the temperature of the local cooling region of the first mist and the oxidation efficiency of ozone gas to NO (Δ NO/O) in the exhaust gas treatment experiments conducted under the spraying
[ Table 2]
Measuring temperature of thermometer
About 95 deg.C
About 70 deg.C
About 70 deg.C
ΔNO/O3
39.2%
44.3%
83.2%
Oxidation efficiency of NO by ozone gas (Delta NO/O)3) Is the molar ratio of the amount of NO gas oxidized Δ NO in the reaction tower to the amount of ozone gas injected into the first mist from the first ejection hole. Delta NO/O3The larger the value of (b), the more the amount of NO gas oxidized by ozone. Further, it is considered that if Δ NO/O3If the value of (b) is small, the amount of ozone that is not used for oxidation of NO and is thermally decomposed is large among the injected ozone.
The temperature of the local cooling region of the first mist is 100 ℃ or lower under any of
ΔNO/O3The value of (b) is 50% or less under the
First spray experiment
Using the spray nozzle shown in fig. 1 to 4, a gas-liquid mixture in which cooling water and air were mixed was ejected from the second ejection hole to form a first mist, and the average flow velocity of a plurality of water droplets and the particle diameter of the water droplets in the first mist were measured. The spray conditions in this measurement were the same as the water pressure and air pressure in
[ Table 3]
Average flow velocity at point A
25.3m/s
28.9m/s
31.8m/s
Average flow velocity at point B
12.0m/s
14.5m/s
16.1m/s
Maximum particle diameter of water droplets
115μm
185μm
180μm
Average particle diameter of water droplets
43.9μm
64.6μm
56.8μm
With respect to the average flow rates at points a and B,
In the exhaust gas treatment experiment,. DELTA.NO/O under
Second spray experiment
A spray nozzle in which the tip (first discharge hole 3) of the first tube 4 (ozone tube) is positioned on the discharge surface (the distance d from the discharge surface to the tip of the ozone tube is 0mm) as in the spray nozzle shown in fig. 2, a spray nozzle in which the tip (first discharge hole 3) of the first tube 4 (ozone tube) protrudes from the discharge surface (d is 2mm) as in the spray nozzle shown in fig. 6, and five spray nozzles in which the tip (first discharge hole 3) of the first tube 4 (ozone tube) is disposed at a position recessed from the discharge surface as in the spray nozzle shown in fig. 7 (d is-1 mm, -2mm, -3mm, -4mm, -5mm) were manufactured.
Using the prepared spray nozzle, a gas-liquid mixture in which cooling water and air are mixed is ejected from the second ejection hole to form a first mist, and ozone-containing gas is ejected from the first ejection hole. The sauter mean particle diameter D of the water droplets at point B (point 1000mm from the tip of the spray nozzle 30) in fig. 10 of the formed first mist was measured. The supply pressure was adjusted so that the supply flow rate Qw of the cooling water was 150L/h, the supply flow rate Qa of the air was 500L/min, and the supply flow rate Qo of the ozone-containing gas was 100L/min. The measurement results are shown in table 4, fig. 11, and fig. 12.
[ Table 4]
The supply pressure difference Δ Po of the ozone-containing gas shown in table 4 and fig. 11 represents the difference from the reference pressure when the ozone supply pressure Po is set as the reference pressure in the measurement using the spray nozzle having d of 0 mm.
The sauter mean particle diameter D shown in table 4 is expressed in percentage based on the sauter mean particle diameter D measured in a measurement using a spray nozzle with D being 0mm (100%). The change rate of the sauter mean particle diameter shown in table 4 and fig. 12 is a change rate of the mean particle diameter D from the reference mean particle diameter.
As shown in table 4 and fig. 11, it is understood that the supply pressure Po of the ozone-containing gas in the measurement using the spray nozzles with d of-1 mm and 2mm is substantially the same as the supply pressure Po (reference pressure) of the ozone-containing gas in the measurement using the spray nozzles with d of 0mm, but the supply pressure difference Δ Po increases as the distance from the nozzle orifice surface to the tip of the ozone tube increases (the tip of the ozone tube is located deeper) in the measurement using the spray nozzles with d of-2 mm, -3mm, -4mm, and-5 mm. When the distal end of the ozone tube is located at a deep position, the
Although the tip of the ozone tube is disposed at a position recessed from the nozzle opening surface in the spray nozzle having d-1 mm, the supply pressure Po of the ozone-containing gas is substantially the same as the supply pressure Po (reference pressure) of the ozone-containing gas in the measurement using the spray nozzle having d-0 mm. Therefore, in this spray nozzle, it is considered that the gas containing ozone ejected from the first ejection holes 3 is not mixed with the gas-liquid mixture ejected from the second ejection holes 2 in the interior of the spray nozzle (internal mixing), but is mixed with the gas-liquid mixture outside the spray nozzle (external mixing).
As shown in table 4 and fig. 12, the sauter mean particle diameter D of the water droplets measured in the measurement using the spray nozzles with D of-1 mm, -2mm, -3mm, -4mm and-5 mm was small, but the sauter mean particle diameter D of the water droplets increased in the measurement using the spray nozzle with D of 0mm, and the sauter mean particle diameter D of the water droplets further increased in the measurement using the spray nozzle with D of 2 mm. Therefore, it is known that the position of the distal end of the ozone tube affects the average particle diameter D of water droplets contained in mist.
Therefore, it is found that by setting D to-2 mm. ltoreq.d < 0mm, the average particle diameter D of the water droplets contained in the mist can be reduced while suppressing the increase in the supply pressure of the ozone-containing gas. In addition, in the case where the air flow rate Qa is the same, the smaller the average particle diameter D of the water droplets of the mist, the higher the cooling efficiency.
Description of the reference numerals
2: second ejection hole 3: first ejection hole 4: first pipe 5: second pipe 6: third pipe 7: fourth tube 8: air discharge hole 10: oxidant gas flow path 11: water flow path 12: gas flow paths 13, 13a to 13 h: communication flow path 14: air flow path 15: gas-liquid mixture flow path 6: gas-liquid mixing section 17: swirling-flow forming portion 18: support portion 19: front end 21 of outer wall of second ejection hole: process gas flow path 22: flow path wall 23: water droplet 24: first mist 30: first spray nozzle 41: glass melting furnace 42: reaction column 43: the dust collector 44: chimney 45: exhaust gas flow path 47: second mist 48: third mist 49: water seal grooves 52, 52a, 52b, 52 c: pumps 55, 55a, 55b, 55c, 55 d: thermometers 56, 56a, 56b, 56 c: gas concentration measuring device 58: ORP meter 62: dust 64: seal water (cooling water) 66: ozone generating device 67: second spray nozzle 68: third spray nozzle 69: the air compressor 71: cooling water 72: aqueous NaOH solution (or NaOH and Na)2SO3Mixed aqueous solution of (1) 80: exhaust gas treatment device
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