JP7502766B2 - Decomposition treatment device and cooling device used therein - Google Patents

Description

The present invention relates to a decomposition treatment device that decomposes an object to be decomposed by spraying water plasma using an arc discharge generated between a cathode and an anode, and a cooling device used therein.

The device described in Patent Document 1 is known as a device that uses water plasma to treat waste. In the device of Patent Document 1, water is used as a plasma stabilizing medium, and incineration ash is supplied to a water plasma jet stream generated by arc discharge to dissolve the incineration ash. In Patent Document 1, the water plasma jet stream is discharged from the nozzle of a water plasma burner, and gases such as hydrogen chloride gas that are generated with the generation of water plasma are treated by a gas treatment means.

Japanese Patent No. 3408779

In the case of water plasma as described in Patent Document 1, the temperature becomes extremely high at approximately 20,000 degrees, so the gas generated along with the water plasma also becomes hot. On the other hand, the temperature of the gas that can be processed by the gas processing means is considerably lower, so the generated gas needs to be cooled by a cooling device. Recently, there has also been a need to place the plasma generating device, gas processing means, and cooling device in a single housing so that it can be transported by vehicle. To meet this need, it is necessary to efficiently cool the high-temperature gas while saving space by fitting the cooling device inside the housing.

The present invention has been made in consideration of these points, and aims to provide a decomposition processing device and a cooling device used therein that can efficiently cool high-temperature gas generated by water plasma and save space in the cooling device.

The decomposition treatment apparatus of the present invention is a decomposition treatment apparatus comprising: a water plasma generator that injects water plasma by passing an arc discharge inside a vortex water flow; a supply device that supplies a decomposition object to a jet stream of the water plasma; a cooling device that cools high-temperature gas containing the decomposition object that has been decomposed by the water plasma; and a housing in which the water plasma generator and the cooling device are arranged, wherein the cooling device comprises: a container body that is arranged at the upper part of the housing on the water plasma injection side of the water plasma generator and into which the high-temperature gas flows; a first flow path section that is connected to the container body at its upstream side and extends downward and through which the high-temperature gas flows from within the container body; a second flow path section that is connected to the first flow path section at its upstream side and extends horizontally and through which the high-temperature gas flows from the first flow path section; and a third flow path section that is connected to the second flow path section at its upstream side and extends upward and through which the high-temperature gas flows from the second flow path section , and the second flow path section comprises a plurality of heat dissipation tubes that are immersed in a cooling liquid in a cooling tank .
In addition, the decomposition treatment device of the present invention is a decomposition treatment device comprising: a water plasma generator that injects water plasma by passing an arc discharge inside a vortex water flow; a supply device that supplies a decomposition object to a jet stream of the water plasma; a cooling device that cools high-temperature gas containing the decomposition object that has been decomposed by the water plasma; and a housing in which the water plasma generator and the cooling device are arranged, wherein the cooling device comprises: a container body that is arranged at an upper part of the housing on the water plasma injection side of the water plasma generator and into which the high-temperature gas flows; a first flow path section that is connected to the container body at its upstream side and extends downward and through which the high-temperature gas flows from within the container body; a second flow path section that is connected to the first flow path section at its upstream side and extends horizontally and through which the high-temperature gas flows from the first flow path section; and a third flow path section that is connected to the second flow path section at its upstream side and extends upward and through which the high-temperature gas flows from the second flow path section, and the third flow path section comprises a plurality of heat transfer tubes through which the high-temperature gas flows.

In addition, a cooling device used in a decomposition treatment device of the present invention is used in a decomposition treatment device including a water plasma generator that sprays water plasma by passing an arc discharge inside a vortex water flow, a supply device that supplies a decomposition object to the jet stream of water plasma, and a housing in which the water plasma generator is placed, and is configured to cool high-temperature gas containing the decomposition object that has been decomposed by the water plasma, the cooling device comprising: a container body that is placed at the upper part of the housing on the water plasma spray side of the water plasma generator and into which the high-temperature gas flows; a first flow path section that is connected to the container body at its upstream side and extends downward and through which the high-temperature gas flows from within the container body; a second flow path section that is connected to the first flow path section at its upstream side and extends horizontally and through which the high-temperature gas flows from the first flow path section; and a third flow path section that is connected to the second flow path section at its upstream side and extends upward and through which the high-temperature gas flows from the second flow path section , and is configured inside the housing, the second flow path section comprising a plurality of heat dissipation tubes that are immersed in a cooling liquid in a cooling tank .
In addition, a cooling device used in a decomposition treatment device of the present invention is used in a decomposition treatment device including a water plasma generator that sprays water plasma by passing an arc discharge inside a vortex water flow, a supply device that supplies a decomposition object to a jet stream of the water plasma, and a housing in which the water plasma generator is placed, and is configured to cool high-temperature gas containing the decomposition object that has been decomposed by the water plasma, the cooling device being configured to include a container body that is placed at the upper part of the housing on the water plasma spray side of the water plasma generator and into which the high-temperature gas flows, a first flow path section that is connected to the container body at its upstream side and extends downward and through which the high-temperature gas flows from within the container body, a second flow path section that is connected to the first flow path section at its upstream side and extends horizontally and through which the high-temperature gas flows from the first flow path section, and a third flow path section that is connected to the second flow path section at its upstream side and extends upward and through which the high-temperature gas flows from the second flow path section, and is configured inside the housing, the third flow path section comprising a plurality of heat transfer tubes through which the high-temperature gas flows.

According to the present invention, the high-temperature gas generated by the extremely high-temperature water plasma can be circulated from the top to the bottom of the housing by the first flow path section, and from the bottom to the top of the housing by the third flow path section, thereby lengthening the path of the gas flow. This allows the cooling efficiency to be improved by increasing the area for cooling and heat dissipation in the first and third flow path sections, and by increasing the size of the cooling structure. Furthermore, the second flow path section extending horizontally is connected to the lower end sides of the first and third flow path sections, making it easier to adopt a cooling structure in which the second flow path section serves as the bottom side of the housing and stores cooling water, which also improves the cooling efficiency. Moreover, the first and third flow path sections make effective use of the vertical width of the housing, and the vertical width of the second flow path section is increased while being shortened, thereby saving space in the plan view of the cooling device. In this way, the present invention makes it possible to achieve both improved cooling efficiency and space saving.

1 is a side view, partially in cross section, of a decomposition processing apparatus according to an embodiment of the present invention; FIG. 2 is an explanatory diagram of the water plasma generating device and its peripheral devices. FIG. 2 is a cross-sectional side view of the chamber. FIG. 2 is a plan cross-sectional view of the chamber. FIG. 2 is a longitudinal sectional view of the chamber. FIG. 2 is an explanatory diagram of the decomposition process of the decomposition object.

The following describes in detail an embodiment of the present invention with reference to the accompanying drawings. Note that the configurations of the embodiments are not limited to those shown below and may be modified as appropriate. Also, in the following drawings, some configurations may be omitted for ease of explanation.

Figure 1 is a side view of a decomposition processing device according to an embodiment, with a partial cross section. In the following description, unless otherwise specified, "upper," "lower," "left," "right," "front," and "rear" refer to the directions indicated by the arrows in each figure. In Figure 1, the front side of the page is the "left," and the rear side is the "right." However, the orientation of each component in the following embodiment is merely an example, and can be changed to any orientation.

Figure 1 is an explanatory diagram showing a partial cross-sectional side view of the decomposition treatment device of this embodiment. As shown in Figure 1, the decomposition treatment device 10 is configured with a housing 11, and a water plasma generator 12, a supply device 13, a cooling device 14, and a gas treatment device 15 arranged inside the housing 11.

The housing 11 is not particularly limited, but in this embodiment, a cargo container that can be transported by truck, train, ship, etc. can be used. Specifically, the housing 11 is formed in a rectangular box shape with a bottom wall 11a and a top wall 11b that are elongated from front to back and a substantially rectangular shape, and four peripheral walls 11c (one of which is not shown) erected between the four sides of the bottom wall 11a and the top wall 11b. The peripheral wall 11c is provided with an appropriate opening and a door for opening and closing the opening, etc., which are not shown.

Inside the housing 11, the water plasma generator 12, the supply device 13, the cooling device 14, and the gas processing device 15 are arranged in this order from rear to front. A partition wall 11d is provided between the cooling device 14 and the gas processing device 15. A hanging support structure 11f that supports the water plasma generator 12 so that it can slide in the front-rear direction is provided on the top wall 11b of the housing 11, and the water plasma generator 12 is supported at an upper position near the top wall 11b inside the housing 11 by the hanging support structure 11f.

Figure 2 is an explanatory diagram of the water plasma generator and its peripheral devices. As shown in Figure 2, the water plasma generator 12 is configured with a cathode 16 that extends forward and backward, a chamber 17 into which the front end of the cathode 16 is inserted, an iron disk-shaped anode 18 that is provided diagonally downward and forward outside the chamber 17, and an anode support part 19 that supports the anode 18.

The cathode 16 is made of a round rod made of carbon, and can be displaced in the front-rear direction via a feed screw shaft mechanism 21 to adjust the amount of insertion into the chamber 17. The chamber 17 is supported above the anode support part 19 via a support plate 22. An extension cylinder 23 that extends forward and backward is connected to the rear end of the anode support part 19, and a motor 24 is provided at the rear end of the extension cylinder 23. The driving force of the motor 24 is transmitted to the anode 18 through the extension cylinder 23 and the anode support part 19, and the anode 18 is rotatably arranged.

Cooling water is supplied to the chamber 17 via a supply pump 26, and water for plasma is supplied via a high-pressure pump 27. A portion of the water for plasma is sprayed from the front end of the chamber 17 as a jet stream of water plasma. The cooling water supplied to the chamber 17 and the water for plasma that is not sprayed are sucked in via a vacuum pump 28. In the anode support section 19, cooling water that flows inside the anode 18 is also supplied via the supply pump 26, and the cooling water that has absorbed heat in the anode 18 is sucked in via the vacuum pump 28. The detailed configuration of the chamber 17 will be described later.

Returning to FIG. 1, the supply device 13 is equipped with a nozzle 13a provided in front of the water plasma generator 12. The nozzle 13a is connected to the delivery device 29 via piping (not shown), and the material to be decomposed (hazardous waste) in granular, powdered, or liquid form is delivered from the delivery device 29. The nozzle 13a feeds (supplies) the delivered material to be decomposed into the jet stream of water plasma sprayed from the water plasma generator 12. Note that various configurations may be adopted for the configuration of the supply device 13 including the nozzle 13a, as long as the material to be decomposed can be delivered into the jet stream of water plasma.

The cooling device 14 cools the high-temperature gas containing the decomposition target that has been decomposed by the water plasma sprayed from the water plasma generator 12. The cooling device 14 includes a container body 30 arranged on the front side (water plasma spray side) of the water plasma generator 12, a first flow path section 31 connected to the front part of the container body 30 and extending downward, a second flow path section 32 connected to the lower part of the first flow path section 31 and extending in the front-rear direction (horizontal direction), and a third flow path section 33 connected to the front part of the second flow path section 32 and extending upward. In the cooling device 14, the high-temperature gas flows in the order of the container body 30, the first flow path section 31, the second flow path section 32, and the third flow path section 33. Thus, a flow of high-temperature gas from upstream to downstream in this order is formed in the cooling device 14.

The container body 30 is supported via a stand 35 at an upper position near the top wall 11b inside the housing 11, and is arranged so as to cover the jet stream of water plasma sprayed from the water plasma generator 12. Therefore, high-temperature gas generated by the water plasma of the water plasma generator 12 flows into the container body 30.

The container body 30 has a cylindrical tube body 36 that is open at the rear, and a front closing section 37 that closes the front end of the tube body 36. The axial direction of the tube body 36 is inclined so that it becomes lower as it moves away from the water plasma generator 12.

The tube body 36 and the front blocking section 37 have a double structure, and a space is formed within their thickness through which cooling water flows. A supply path and a discharge path for cooling water (neither shown) are connected to this space, and by circulating the cooling water, the heat generated by the water plasma is absorbed, thereby providing a cooling effect for the tube body 36 and the front blocking section 37.

The first flow path section 31 has three vertical pipes 39 (one not shown), with the upper end side being the upstream side and the lower end side being the downstream side. The upper end side of the vertical pipes 39 is curved in a quadrant arc and connected to the front blocking section 37, and communicates with the inside of the container body 30, allowing high-temperature gas to flow from inside the container body 30 to the vertical pipes 39.

The first flow path section 31 and the front region of the container body 30 are covered on the upper side and both left and right sides by a cover member 41. An injection section 42 that injects cooling water (cooling liquid) L is provided on the upper side of the cover member 41 at a position above the upper end of the vertical pipe 39. The injection section 42 injects cooling water L supplied from a cooling water supply source (not shown) onto the upper end side (upstream side) of the vertical pipe 39 to achieve a cooling effect. The injection section 42 is supported on the inside of the cover member 41 via a support member (not shown).

The second flow path section 32 includes three inlet tanks 44 connected to the lower ends of the three vertical pipes 39 and arranged vertically, and a plurality of heat dissipation pipes 45 that are connected to the rear ends of the inlet tanks 44, extend forward, and are arranged in multiple rows in the left-right and up-down directions. The second flow path section 32 also includes one outlet tank 46 to which the front ends of the heat dissipation pipes 45 are connected. The heat dissipation pipes 45 are formed in a twisted shape with a petal-shaped cross section, which increases the surface area.

The second flow path section 32 has the inlet tank 44 side as the upstream side and the outlet tank 46 side as the downstream side, through which the high-temperature gas from the first flow path section 31 flows. In the second flow path section 32, the high-temperature gas flows from the inlet tank 44 branching into multiple heat dissipation pipes 45, and then the high-temperature gas that branches into the heat dissipation pipes 45 and flows is collected at the outlet tank 46.

The second flow path section 32 is immersed in the cooling water L in a cooling tank 48 that is open at the top. Heat is exchanged between the cooling water L and the high-temperature gas flowing in the second flow path section 32, which includes a plurality of heat dissipation pipes 45, to cool the high-temperature gas. The lower ends of the first flow path section 31 and the third flow path section 33 are also housed in the cooling tank 48 and are immersed in the cooling water L in the cooling tank 48 to be cooled.

The cooling water L in the cooling tank 48 is cooled by circulating between the cooling tank 48 and an external device, such as a cooling tower, provided outside the housing 11 via a pump or the like. Note that this does not prevent such an external device from being placed inside the housing 11.

The third flow path section 33 includes a pipe 50 that is connected to the outlet tank 46 and extends upward, and a radiator 51 that is provided in the middle of the extension direction of the pipe 50. The radiator 51 includes a plurality of heat transfer tubes 51a through which high-temperature gas flows, and a tank 51b that houses each heat transfer tube 51a and through which cooling water circulates.

The third flow path section 33 is configured with the lower end side of the pipe 50 as the upstream side and the upper end side of the pipe 50 as the downstream side, through which the high-temperature gas from the second flow path section 32 flows. In the third flow path section 33, heat exchange occurs between the high-temperature gas flowing in the heat transfer tube 51a and the cooling water circulating in the tank 51b, thereby cooling the high-temperature gas. The upper end side of the pipe 50 is curved and penetrates the partition wall 11d, and is connected to the gas treatment device 15 in front of the partition wall 11d. Thus, the high-temperature gas that has passed through the third flow path section 33 is supplied to the gas treatment device 15.

The gas processing device 15 is a known processing device that processes various gases (chlorine-based gases, nitrogen oxides, sulfur oxides, etc.) that are generated when the decomposition target is treated with water plasma. In this embodiment, the gas processing device 15 is configured to be installed inside the housing 11, but it may also be configured to be connected to an external device installed outside the housing 11.

Next, the internal structure of the chamber 17 will be described with reference to Figures 3 to 5. Figure 3 is a side cross-sectional view of the chamber, Figure 4 is a plan cross-sectional view of the chamber, and Figure 5 is a vertical cross-sectional view of the chamber.

As shown in Figures 3 and 4, the chamber 17 constituting the water plasma generator 12 comprises a chamber body 70 forming a cylindrical inner circumferential surface extending in the front-rear direction, and a front wall portion 71 attached to the front of the chamber body 70, forming an internal space 72 for generating water plasma inside them. An opening communicating with the internal space 72 is formed in the front wall portion 71, and an injection port forming plate 74 is attached so as to close this opening from the front. An injection port 75 for injecting water plasma is formed in the injection port forming plate 74.

A rib 70a is formed inside the chamber body 70 at a position toward the front, extending in the circumferential direction, and a plasma water supply passage 77 is formed forward of this rib 70a. The front wall portion 71 is also formed with a plasma water discharge passage 78 that discharges the plasma water that flows into its opening. High-pressure plasma water is supplied to the plasma water supply passage 77 from the high-pressure pump 27, and the plasma water is sucked from the plasma water discharge passage 78 by the negative pressure of the vacuum pump 28.

A cooling water supply channel 80 and a cooling water discharge channel 81 (not shown in FIG. 4) are formed behind the rib 70a of the chamber body 70. Cooling water is supplied to the cooling water supply channel 80 from the supply pump 26, and cooling water is sucked from the cooling water discharge channel 81 by the negative pressure of the vacuum pump 28. The plasma water supply channel 77, the cooling water supply channel 80, and the cooling water discharge channel 81 are formed in the shape of a round hole that forms the inner circumferential surface of a cylinder.

As shown in FIG. 5, the plasma water supply passage 77 is connected to the lower part of the internal space 72, which is circular in vertical cross section, and extends in the left-right direction. Specifically, the plasma water supply passage 77 extends in the tangent direction of the lower part of the internal space 72. This allows the plasma water flowing in from the plasma water supply passage 77 to flow smoothly along the circumferential direction of the internal space 72.

The water plasma generator 12 includes a roughly cylindrical vortex water generator 90 housed in the chamber 17. The vortex water generator 90 is arranged so that its central axis C1 coincides with the internal space 72. This central axis C1 coincides with the central axis of the above-mentioned injection port 75. In a vertical cross-sectional view, the internal space 72 forms a circular space between its inner circumferential surface and the outer circumferential surface of the vortex water generator 90, and the water for plasma that flows into the internal space 72 as described above flows in a swirling manner within the circular space.

The vortex generator 90 has a plurality of passages 91 formed therethrough to communicate between the inside and outside. The passages 91 are formed at equal angles (every 120° in this embodiment) around the circumference of the vortex generator 90. The passages 91 are also formed at a predetermined interval in the front-rear direction (see Figures 3 and 4). Each passage 91 extends in a direction inclined with respect to the thickness direction of the vortex generator 90. Specifically, each passage 91 extends in the tangent direction of the inner circumference of the vortex generator 90 at the communication position. The angle θ between the direction in which the plasma water flows from the outside to the inside of the passage 91 and the direction in which the plasma water swirls and flows outside the vortex generator 90 is an acute angle.

By forming the passage 91 as described above, the water for plasma flowing along the inner circumferential surface of the chamber body 70 outside the vortex flow generator 90 passes through the passage 91 and flows into the inside of the vortex flow generator 90. The water for plasma then flows smoothly along the inner circumferential surface of the vortex flow generator 90, forming a vortex flow that swirls in a circular shape to form a cavity at the central axis position C1 in a vertical cross-sectional view. An arc discharge AR (see FIG. 6) is then generated between the anode 18 and the cathode 16 so as to pass through the inside of the cavity formed in the vortex flow.

The water plasma generator 12 further includes various components behind the vortex generator 90 in the chamber 17. These components position the vortex generator 90, cool, hold and control the movement of the cathode 16, and supply power to the cathode 16, but a detailed description is omitted here.

Next, the method of decomposition processing of the decomposition target by the decomposition processing device 10 of this embodiment will be described with reference to FIG. 6. FIG. 6 is an explanatory diagram of the decomposition processing of the decomposition target. Here, as shown in FIG. 6, the anode 18 is provided so that its upper end is located near the front of the injection port 75 diagonally below outside the chamber 17. In addition, the nozzle 13a of the supply device 13 is provided at a distance in front outside the chamber 17.

When DC power is supplied to the cathode 16 and the anode 18 while a vortex water flow with a cavity is formed as described above, an arc discharge AR is generated between them. At this time, the arc discharge AR is generated so as to pass through the cavity of the vortex water flow. Due to the generation of this arc discharge AR, the plasma water that forms the vortex water flow is dissociated and ionized, and a jet stream J of high-energy water plasma is sprayed from the nozzle 75.

The jet stream J of water plasma ejected from the nozzle 75 becomes an extremely high-temperature, ultra-high-speed fluid, which decomposes the material to be decomposed that is thrown in from the tip of each nozzle 13a. When the material to be decomposed is hazardous waste, examples of the material include PCB, sulfuric acid pitch, asbestos, fluorocarbons, halon, tires, and various types of garbage, and these are supplied in granular, powdered, or liquid form via the supply device 13. Even if such hazardous waste is thrown in, it can be decomposed into harmless waste.

During the decomposition process of the material to be decomposed, the container body 30 (see Figure 1) will be heated, but it can be cooled and reused by passing cooling water through its thickness.

The high-temperature gas containing the decomposition target decomposed by the jet stream J of water plasma becomes extremely hot, at about 2000°C, in the container body 30. The high-temperature gas is cooled by the cooling device 14. The cooling method will be described below with reference to FIG. 1. The high-temperature gas in the container body 30 flows into the first flow path section 31 and flows downward through the three vertical pipes 39. At this time, cooling water L is sprayed from the spray section 42 onto the upper end side of the vertical pipes 39, and heat is exchanged between the cooling water L and the high-temperature gas in the vertical pipes 39 to cool the high-temperature gas. Here, since the lower end of each vertical pipe 39 is contained in the cooling tank 48, even if the cooling water L sprayed from the spray section 42 falls without vaporizing, it is stored in the cooling tank 48. Therefore, the cooling water L sprayed from the spray section 42 can be recovered and circulated as the cooling water L in the cooling tank 48 for use.

The high-temperature gas that has been cooled while flowing through the first flow path section 31 flows into the second flow path section 32 and flows forward through the multiple heat dissipation pipes 45. The heat dissipation pipes 45 are immersed in the cooling water L in the cooling tank 48, so that heat exchange occurs between the cooling water L and the high-temperature gas in the heat dissipation pipes 45, and the high-temperature gas is cooled. Note that a cooling effect is also obtained in the inlet tank 44, etc., which is immersed in the cooling water L in the cooling tank 48.

The high-temperature gas that has been cooled while flowing through the second flow path section 32 flows into the third flow path section 33 and flows upward through the heat transfer tube 51a of the radiator 51. At this time, cooling water is circulated in the tank 51b of the radiator 51, so that heat exchange occurs between the cooling water and the high-temperature gas in the heat transfer tube 51a, and the high-temperature gas is cooled.

The high-temperature gas cooled in the first flow path section 31, the second flow path section 32, and the third flow path section 33 as described above is cooled to approximately 100°C and processed in the gas processing device 15 to become a safe exhaust gas through a neutralization reaction or the like.

According to the above embodiment, the high-temperature gas that becomes extremely hot due to the jet stream J of the water plasma can be cooled by the first to third flow passages 31 to 33. With this cooling, the first flow passage 31 and the third flow passage 33 can be arranged to increase the vertical length within the housing 11, and the cooling effect of the ejection unit 42, the cooling tank 48, and the radiator 51 can be obtained over a wider range, thereby improving the cooling efficiency. In addition, since the second flow passage 32 is located on the bottom wall 11a side of the housing 11, it is possible to facilitate cooling and heat dissipation within the cooling tank 48 installed on the bottom wall 11a. Moreover, the first flow passage 31 and the third flow passage 33 make effective use of the vertical width of the housing 11, and by increasing the vertical width of the second flow passage 32 while shortening the front-to-rear length, it is possible to save space in the plan view of the cooling device 14. Therefore, in the cooling device 14 of the above embodiment, it is possible to simultaneously improve the cooling efficiency of the high-temperature gas and reduce the installation space within the housing 11.

In addition, since the second flow path section 32 is equipped with multiple heat dissipation pipes 45, heat exchange can be efficiently performed by the cooling water L that is circulated and maintained within a predetermined temperature range.

Furthermore, the third flow path section 33 is equipped with a radiator 51 having multiple heat transfer tubes 51a, and a structure can be adopted that cools the high-temperature gas within the range of the vertical length of the piping 50.

The present invention is not limited to the above embodiment, and can be modified in various ways. In the above embodiment, the size, shape, direction, etc. shown in the attached drawings are not limited to these, and can be modified as appropriate within the scope of the effects of the present invention. In addition, the present invention can be modified as appropriate without departing from the scope of the purpose of the present invention.

For example, the configuration of the first to third flow path sections 31 to 33 is not limited to the above embodiment, and may be modified, such as by configuring the first to third flow path sections 31 to 33 to have a cooling structure different from that described above. For example, a radiator may be further provided in the vertical piping 39 of the first flow path section 31, the extension direction of the heat dissipation pipe 45 in the second flow path section 32 may be extended in a horizontal direction other than the front-rear direction, or a radiator with a configuration different from that described above may be provided in the third flow path section 33.

In addition, although cooling water L is used in the first flow path section 31 and the second flow path section 32, other cooling liquids may be used as long as they have a cooling effect similar to that of the cooling water L.

In addition, the objects to be decomposed by the water plasma generator 12 are not limited to the hazardous wastes mentioned above, and objects that are not particularly hazardous may also be the objects to be decomposed.

In addition, the water plasma generator 12 is not limited to use in waste treatment, but can be used in any treatment that uses water plasma, such as thermal spraying.

The present invention has the effect of improving the efficiency of cooling the high-temperature gas generated by water plasma and reducing the space required for the cooling device.

REFERENCE SIGNS LIST 10 Decomposition treatment device 11 Housing 12 Water plasma generation device 13 Supply device 14 Cooling device 30 Container body 31 First flow path section 32 Second flow path section 33 Third flow path section 42 Injection section 45 Heat dissipation tube 48 Cooling tank 51a Heat transfer tube AR Arc discharge

Claims (5)

a water plasma generator that injects water plasma by passing an arc discharge through the inside of a vortex water flow;
A supply device for supplying a decomposition target to the jet stream of the water plasma;
a cooling device that cools a high-temperature gas containing the decomposition target that has been decomposed by the water plasma;
A decomposition treatment apparatus including a housing in which the water plasma generating device and the cooling device are disposed,
The cooling device includes a container body disposed in an upper portion of the housing on the water plasma ejection side of the water plasma generating device, into which the high-temperature gas flows;
a first flow passage portion that is connected to the container body at an upstream side and extends downward, through which the high-temperature gas flows from inside the container body;
a second flow path portion connected to the first flow path portion at an upstream side thereof and extending in a horizontal direction, through which the high-temperature gas flows from the first flow path portion;
a third flow path portion connected to the second flow path portion at an upstream side thereof and extending upward, through which the high-temperature gas flows from the second flow path portion ;
The decomposition processing apparatus , wherein the second flow path portion includes a plurality of heat radiation pipes immersed in the cooling liquid in the cooling tank . The cooling tank is provided with an open top,
The first flow path portion has a lower end side accommodated in the cooling tank,
The decomposition processing apparatus according to claim 1 , further comprising an injection section for injecting the cooling liquid, the injection section being provided upstream of the first flow path section. a water plasma generator that injects water plasma by passing an arc discharge through the inside of a vortex water flow;
A supply device for supplying a decomposition target to the jet stream of the water plasma;
a cooling device that cools a high-temperature gas containing the decomposition target that has been decomposed by the water plasma;
A decomposition treatment apparatus including a housing in which the water plasma generating device and the cooling device are disposed,
The cooling device includes a container body disposed in an upper portion of the housing on the water plasma ejection side of the water plasma generating device, into which the high-temperature gas flows;
a first flow passage portion that is connected to the container body at an upstream side and extends downward, through which the high-temperature gas flows from inside the container body;
a second flow path portion connected to the first flow path portion at an upstream side thereof and extending in a horizontal direction, through which the high-temperature gas flows from the first flow path portion;
a third flow path portion connected to the second flow path portion at an upstream side thereof and extending upward, through which the high-temperature gas flows from the second flow path portion ;
The decomposition treatment apparatus according to claim 1, wherein the third flow path portion includes a plurality of heat transfer tubes through which the high-temperature gas flows . a water plasma generator that injects water plasma by passing an arc discharge through the inside of a vortex water flow;
A supply device for supplying a decomposition target to the jet stream of the water plasma;
A cooling device for use in a decomposition treatment device including a housing in which the water plasma generator is disposed, the cooling device cooling a high-temperature gas containing the decomposition target that has been decomposed by the water plasma,
a container body disposed in an upper portion of the housing on a water plasma ejection side of the water plasma generating device and into which the high-temperature gas flows;
a first flow passage portion that is connected to the container body at an upstream side and extends downward, through which the high-temperature gas flows from inside the container body;
a second flow path portion connected to the first flow path portion at an upstream side thereof and extending in a horizontal direction, through which the high-temperature gas flows from the first flow path portion;
a third flow path portion having an upstream side connected to the second flow path portion and extending upward, through which the high-temperature gas flows from the second flow path portion, and the third flow path portion is disposed inside the housing ;
3. A cooling device for use in a decomposition processing device , wherein the second flow path portion includes a plurality of heat radiation pipes immersed in a cooling liquid in a cooling tank . a water plasma generator that injects water plasma by passing an arc discharge through the inside of a vortex water flow;
A supply device for supplying a decomposition target to the jet stream of the water plasma;
A cooling device for use in a decomposition treatment device including a housing in which the water plasma generator is disposed, the cooling device cooling a high-temperature gas containing the decomposition target that has been decomposed by the water plasma,
a container body disposed in an upper portion of the housing on a water plasma ejection side of the water plasma generating device and into which the high-temperature gas flows;
a first flow passage portion that is connected to the container body at an upstream side and extends downward, through which the high-temperature gas flows from inside the container body;
a second flow passage portion connected to the first flow passage portion at an upstream side thereof and extending in a horizontal direction, through which the high-temperature gas flows from the first flow passage portion;
a third flow path portion connected to the second flow path portion at an upstream side thereof and extending upward, through which the high-temperature gas flows from the second flow path portion; and the third flow path portion is disposed inside the housing ;
3. A cooling device for use in a decomposition processing device , wherein the third flow path portion is provided with a plurality of heat transfer tubes through which the high-temperature gas flows .

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