JP7391370B2 - Water plasma generator, current-carrying member used therein, and water plasma generation method - Google Patents

Description

The present invention relates to a water plasma generation device that decomposes an object to be decomposed by injecting water plasma using an arc discharge generated between a cathode and an anode, a current-carrying member used in the same, and a water plasma generation method.

2. Description of the Related Art As an apparatus for treating waste using water plasma, an apparatus described in Patent Document 1 is known. In the apparatus of Patent Document 1, water is used as a plasma stabilizing medium, and the incinerated ash is supplied to a water plasma jet stream generated by arc discharge to dissolve the incinerated ash. The water plasma jet stream is injected by a water plasma burner, which includes a cathode and an anode for generating arc discharge, and a chamber disposed at the end of the cathode to form a swirling water stream. .

Patent No. 3408779

In the water plasma burner, water plasma is injected by arc discharge between a cathode and an anode through a central cavity of a vortex water flow. Therefore, water plasma cannot be injected unless arc discharge is generated. However, in a water plasma burner, the arc-generating side of the cathode is inside the chamber, while the anode is outside the chamber, and the distance between them is long, so it is difficult to cause the first occurrence (trigger, ignition) of arc discharge. becomes difficult. In this regard, the present inventor has conducted extensive research through repeated trial and error, and has discovered a configuration and method for easily triggering arc discharge in water plasma injection.

The present invention has been made in view of these points, and provides a water plasma generating device that can easily generate an arc discharge between an anode and a cathode to inject water plasma, and an energizing device used therein. The purpose of the present invention is to provide a member and a water plasma generation method.

The water plasma generating device of the present invention is a water plasma generating device that injects water plasma by passing an arc discharge inside a vortex water flow, wherein the vortex water flow is formed inside and the water plasma is injected from an injection port. an anode provided outside the chamber near the injection port; and a cathode having one end inserted into the chamber and generating an arc discharge passing through the vortex water flow between the anode and the anode. An auxiliary anode section is provided on the outer peripheral side of the chamber and is electrically connected in parallel with the anode, and the auxiliary anode section includes an energizing member that contacts one end of the cathode and passes through the injection port. The auxiliary anode section is provided so as to be able to conduct electricity with the current-carrying member while holding the base, and the auxiliary anode portion includes a base attached to the outer peripheral side of the chamber, a clamping member that sandwiches the base and the current-carrying member, and a clamping member that holds the clamping member on the base side. and an elastic member that applies a pressing force to the body .

According to this configuration, the current-carrying member is held in contact with the cathode by the auxiliary anode section, and then a voltage is applied to the anode, the auxiliary anode section, and the cathode to energize the current-carrying member. The current-carrying member can be vaporized. Immediately after or substantially simultaneously with this vaporization, arc discharge can be generated between the anode and the cathode by the current flowing through the current-carrying member. In other words, the current-carrying member that is vaporized by energization can be used as a trigger for arc discharge, and the trigger can be generated easily and stably.

Further, the current-carrying member used in the water plasma generator of the present invention includes an insertion shaft portion that contacts one end of the cathode and passes through the injection port, a holding shaft portion that is held by the auxiliary anode portion, and the insertion shaft portion that is held by the auxiliary anode portion. It is characterized in that it is formed by a shaft-shaped body including a shaft portion and a connecting shaft portion that connects the holding shaft portion.

Further, the water plasma generation method of the present invention is a water plasma generation method using the water plasma generation device, in which the current-carrying member is passed through the injection port and brought into contact with one end of the cathode. a holding step in which the current-carrying member is held in the auxiliary anode section; a vortex water flow forming step in which the vortex water flow is formed inside the chamber before and after the holding step; and after the vortex water flow formation step, the anode, the A voltage is applied to the auxiliary anode and the cathode to energize the current-carrying member, and the heat generated by the energization vaporizes the current-carrying member to generate an arc discharge between the anode and the cathode. and an injection step of injecting the water plasma by passing it through a vortex water flow.

According to the present invention, an arc discharge trigger can be easily generated between an anode and a cathode to inject water plasma.

FIG. 1 is an explanatory diagram of a water plasma generator and its peripheral devices according to an embodiment. FIG. 3 is a side sectional view of the chamber and the auxiliary anode section. FIG. 3 is a plan cross-sectional view of the chamber. FIG. 3 is a longitudinal cross-sectional view of the chamber. It is an explanatory view of a state where arc discharge and water plasma are generated. It is a schematic perspective view of a chamber and an auxiliary anode part. 7A and 7B are circuit diagrams of a water plasma generator. FIG. 3 is an explanatory diagram of a positioning method using a jig.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Note that each configuration according to the embodiment is not limited to the configuration shown below, and can be modified as appropriate. Further, in the following figures, some configurations may be omitted for convenience of explanation.

FIG. 1 is an explanatory diagram of a water plasma generator and its peripheral devices according to an embodiment. In the following description, unless otherwise specified, "top", "bottom", "left", "right", "front", and "back" are used with reference to the direction indicated by the arrow in each figure. In FIG. 1, the front side of the page is the "left" and the depth side is the "right." However, the orientation of each component in the following embodiments is only an example, and can be changed to any orientation.

FIG. 1 is an explanatory diagram of a water plasma generator and its peripheral devices according to the present embodiment. As shown in FIG. 1, the water plasma generator 12 includes a cathode 16 extending back and forth, a chamber 17 into which the front end side (one end side) of the cathode 16 is inserted, and a chamber 17 provided outside the chamber 17 and diagonally downward and forward. The anode 18 is configured to include an anode 18 in the shape of an iron disc, and an anode support portion 19 that supports the anode 18. Further, the water plasma generator 12 includes an auxiliary anode section 40 provided in the chamber 17, and the detailed configuration of the auxiliary anode section 40 will be described later.

The cathode 16 is formed 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 portion 19 via a support plate 22 . An extension cylinder 23 extending back and forth 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 19, and the anode 18 is rotatably provided.

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

A nozzle 31 constituting a supply device 30 is provided in front of the water plasma generator 12 . The nozzle 31 is connected to a delivery device 32 via a pipe (not shown), and granular, powdery, or liquid decomposition targets are delivered from the delivery device 32. The nozzle 31 injects (supplies) the delivered decomposition target into a jet stream of water plasma ejected from the water plasma generator 12 . In addition to the supply device 30 and the water plasma generator 12, there is also a gas treatment device (inorganic) that cools high-temperature gas containing substances to be decomposed by water plasma and then processes it into safe exhaust gas by neutralization reaction or the like. ), a decomposition treatment apparatus can be configured. The decomposition processing apparatus may have a structure in which each of the above-mentioned devices is housed in a container (housing) for transporting cargo, or may be mounted on a truck bed or the like.

Next, the internal structure of the chamber 17 will be explained with reference to FIGS. 2 to 4. FIG. 2 is a side sectional view of the chamber and the auxiliary anode section, FIG. 3 is a plan sectional view of the chamber, and FIG. 4 is a longitudinal sectional view of the chamber. FIG. 5 is an explanatory diagram of a state in which arc discharge and water plasma are generated.

As shown in FIGS. 2 and 3, the chamber 17 constituting the water plasma generator 12 includes a chamber body 70 forming a cylindrical inner peripheral surface extending in the front-rear direction, and a front wall portion attached to the front of the chamber body 70. 71, and an internal space 72 for generating water plasma is formed 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. A jet port 75 for jetting water plasma is formed in the jet port forming plate 74 .

Inside the chamber body 70, a circumferentially extending rib 70a is formed near the front, and a plasma water supply path 77 is formed in front of the rib 70a. Further, a plasma water discharge passage 78 is formed in the front wall portion 71 to discharge plasma water flowing into the opening thereof. High-pressure plasma water is supplied from the high-pressure pump 27 to the plasma water supply path 77 , and plasma water is sucked from the plasma water discharge path 78 by the negative pressure of the vacuum pump 28 .

A cooling water supply path 80 and a cooling water discharge path 81 (not shown in FIG. 3) are formed behind the rib 70a of the chamber body 70. Cooling water is supplied to the cooling water supply path 80 from the supply pump 26 , and cooling water is sucked from the cooling water discharge path 81 by negative pressure of the vacuum pump 28 . The plasma water supply path 77, the cooling water supply path 80, and the cooling water discharge path 81 are formed in the shape of a round hole that forms the inner peripheral surface of the cylinder.

As shown in FIG. 4, the plasma water supply path 77 communicates with the lower part of the internal space 72, which is circular in longitudinal cross-sectional view, and extends in the left-right direction. Specifically, a plasma water supply path 77 extends in the lower tangential direction of the internal space 72 . Thereby, the plasma water flowing from the plasma water supply path 77 flows smoothly along the circumferential direction of the internal space 72.

The water plasma generator 12 includes a generally cylindrical vortex water flow generator 90 housed within the chamber 17 . The vortex water flow generator 90 is arranged so that the inner space 72 and the center axis position C1 coincide with each other. Note that this central axis position C1 coincides with the central axis position of the injection port 75 described above. 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 flow generator 90, and the plasma water flowing into the internal space 72 as described above forms a circular space. It flows in a swirling manner through the space.

A plurality of passages 91 are formed in the vortex water flow generator 90 so as to communicate between the inside and the outside. The passages 91 are formed at equal angles in the circumferential direction of the eddy water flow generator 90 (every 120 degrees in this embodiment). Further, the passages 91 are formed at predetermined intervals in the front-rear direction (see FIGS. 2 and 3). Each passage 91 extends in a direction oblique to the thickness direction of the vortex generator 90 . Specifically, each passage 91 extends in a tangential direction to the inner circumference of the vortex water flow generator 90 at the communication position. Further, the angle θ formed 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 water flow generator 90 is an acute angle.

Since the passage 91 is formed as described above, the plasma water flowing along the inner peripheral surface of the chamber body 70 outside the vortex water flow generator 90 passes through the passage 91 and flows into the inside of the vortex water flow generator 90. Then, the plasma water flows smoothly along the inner peripheral surface of the vortex water flow generator 90, and a vortex water flow is formed that swirls in a circular shape so as to form a cavity at the central axis position C1 in a longitudinal section view. .

When DC power is supplied to the cathode 16 and the anode 18 with the vortex water flow formed in this way, the anode 18 is caused to pass through the cavity formed in the vortex water flow, as shown in FIG. Arc discharge AR begins to occur between the electrode 16 and the cathode 16. Due to the generation of this arc discharge AR, the plasma water forming the eddy water flow is dissociated and ionized, and a jet stream J of water plasma having high energy is injected from the injection port 75. Here, the anode 18 is provided such that its upper end is located near the diagonally lower front of the injection port 75 on the outside of the chamber 17 .

The jet stream J of water plasma injected from the injection port 75 becomes an extremely high-temperature and ultra-high-speed fluid, and when the object to be decomposed is introduced from the tip of each nozzle 31, the object to be decomposed is decomposed. Here, when the substance to be decomposed is hazardous waste, examples thereof include PCBs, sulfuric acid pitch, asbestos, fluorocarbons, halons, tires, various types of garbage, etc. Supplied via Even if such hazardous waste is input, it can be decomposed into harmless waste.

Here, the water plasma generator 12 of the present embodiment includes the auxiliary anode section 40 as a configuration that generates the arc discharge AR after forming the vortex water flow as described above. FIG. 6 is a schematic perspective view of the chamber, the auxiliary anode section, and the jig. As shown in FIGS. 2 and 6, the auxiliary anode section 40 is provided on the outer peripheral side of the chamber 17, and the current-carrying member 60 is held by the auxiliary anode section 40.

The auxiliary anode section 40 includes a plate-shaped base 41 attached to the upper surface 70b of the chamber body 70, a clamping member 42 that clamps the current-carrying member 60 together with the base 41, and an elastic member 43 that applies force to press the clamping member 42 toward the base 41. It is equipped with

The base 41 is constituted by a metal plate made of a conductor such as copper, and is connected to a DC power supply and wiring (none of which are shown) for energization via a connector or the like. The elastic member 43 is formed by a band-shaped leaf spring extending in the front-rear direction. The rear end side (one end side) of the elastic member 43 is connected to the base 41 via a screw (fastening member) 45. The front end side (other end side) of the elastic member 43 is connected to the clamping member 42 .

The holding member 42 includes a connecting portion 42a that is connected to the front end of the elastic member 43 and extends forward, and a gap forming portion 42b that extends diagonally forward toward the upper surface of the base 41 from the front end of the connecting portion 42a. Furthermore, the holding member 42 has a contact piece part 42c extending parallel to the front along the upper surface of the base 41 from the lower end of the interval forming part 42b, and a contact piece part 42c extending diagonally upward from the front end (on the opposite side of the elastic member 43) of the contact piece part 42c. It is provided with a rising portion 42d rising forward.

In the holding member 42, the space forming part 42b is formed, so that the front end sides of the connecting part 42a and the elastic member 43 are arranged at a position separated from the upper surface of the base 41 by a predetermined distance. Therefore, the elastic member 43, which becomes a flat leaf spring in an unloaded state, elastically deforms away from the upper surface of the base 41 toward the front, and exerts an elastic force that presses the front end side of the elastic member 43 downward. . Therefore, the elastic member 43 applies a force that presses the holding member 42 toward the base 41 side.

The rising portion 42d extends from the front end of the contact piece portion 42c in a direction intersecting the base 41, and when inserting the current-carrying member 60 between the contact piece portion 42c and the base 41, the rising portion 42d is provided with a grip margin by the operator's fingertips. It can be used as

FIG. 7A is a circuit diagram of the water plasma generator. The auxiliary anode section 40 is electrically connected in parallel with the anode 18. The auxiliary anode section 40 and the anode 18 are connected to the positive electrode side of a DC power source 47 such as a DC generator. Cathode 16 is connected to the cathode side of DC power supply 47 via switch 48 .

Returning to FIGS. 2 and 6, the current-carrying member 60 is formed by bending two positions of one shaft-like body at approximately right angles, and is held by the auxiliary anode part 40 while passing through the injection port 75 of the chamber 17. be done. The current-carrying member 60 includes an insertion shaft portion 61 that extends in the front-rear direction and passes through the injection port 75, a connecting shaft portion 62 that extends upwardly following the front end of the insertion shaft portion 61, and a connecting shaft portion 62 that extends rearwardly and continues from the upper end of the connecting shaft portion 62. The holding shaft portion 63 is provided. The connecting shaft portion 62 connects the front end of the insertion shaft portion 61 and the front end of the holding shaft portion 63. In this embodiment, the current-carrying member 60 is made of an alloy containing aluminum.

The insertion shaft portion 61 passes through the injection port 75 with its rear end in contact with the front end (one end) of the cathode 16 , and has a length such that its rear end (other end) side protrudes forward of the injection port forming plate 74 in the chamber 17 . established in Further, with the rear end of the insertion shaft 61 in contact with the front end of the cathode 16, the connecting shaft 62 moves forward away from the injection port forming plate 74, which is the front surface of the chamber 17, and the holding shaft 63 moves toward the auxiliary anode 40. In this case, the base 41 and the holding member 42 sandwich and hold it from above and below.

Next, a method for positioning the cathode 16 and the anode 18 in the water plasma generator 12 of this embodiment will be explained. In this positioning method, a water plasma generator jig 100 (hereinafter referred to as "jig 100") shown in FIG. 8 is used. FIG. 8 is an explanatory diagram of a positioning method using a jig. As shown in FIG. 8, the jig 100 is formed of a shaft-like body whose thickness (cross-sectional shape perpendicular to the extending direction) varies in stages. The jig 100 includes a cathode position adjustment section 101, an anode position adjustment section 102, and a grip section 103. In this embodiment, the cathode position adjustment section 101, the anode position adjustment section 102, and the grip section 103 are each formed in an extending round bar shape with a circular cross-sectional shape, and their central axes are arranged at the same position.

The cathode position adjustment section 101 has a cross-sectional shape perpendicular to the extending direction that is approximately the same as or slightly smaller than the opening shape of the injection port 75 . In this embodiment, the injection port 75 is formed in the shape of a round hole, and the cathode position adjustment section 101 is formed in the shape of a round rod. formed to the dimensions. As a result, the cathode position adjusting section 101 can be inserted into the injection port 75, and in the inserted state, the cathode position adjustment section 101 inserted into the injection port 75 can be inserted in the front-rear direction and the left-right direction intersecting the extending direction. The occurrence of sagging is suppressed.

The cathode position adjustment section 101 extends linearly in a predetermined direction, with the anode position adjustment section 102 side (front side in FIG. 8) as a base end and the opposite side (rear side in FIG. 8) as a tip. The length of the cathode position adjustment section 101 in the extending direction is defined as the length from the front outer surface of the injection port forming plate 74 near the injection port 75 of the chamber 17 to the front end (one end) of the cathode 16 at the appropriate longitudinal position. It is assumed to be the same as the length. Therefore, with the base end of the cathode position adjustment section 101 aligned with the front outer surface of the injection port forming plate 74 and the front end of the cathode 16 in contact with the tip of the cathode position adjustment section 101, the cathode 16 is at an appropriate front-rear position.

The anode position adjustment section 102 is provided continuously from the base end of the cathode position adjustment section 101 . The anode position adjustment section 102 is formed to have a larger diameter than the opening diameters of the cathode position adjustment section 101 and the injection port 75 . In other words, the anode position adjustment section 102 is provided in a shape that protrudes from the outer peripheral surface of the cathode position adjustment section 101 in a direction perpendicular to (crosses) the extension direction. As a result, when the cathode position adjustment section 101 is inserted into the injection port 75, the anode position adjustment section 102 can come into contact with the front outer surface of the injection port formation plate 74, and this contact causes the entire jig 100 to move rearward. Functions as a regulating stopper.

The diameter of the anode position adjustment section 102 is such that when the cathode position adjustment section 101 is inserted into the injection port 75, the anode position adjustment section 102 is placed on the upper end surface (the end surface on the injection port 75 side) of the anode 18, which is in the appropriate vertical position. This is the position where the lowest end of the Therefore, when the cathode position adjustment section 101 is inserted into the injection port 75 and the lowermost end of the anode position adjustment section 102 is in contact with the upper end surface of the anode 18 outside the chamber 17, the anode 18 is placed in the appropriate vertical position. .

The grip section 103 is provided at a position opposite to the cathode position adjustment section 101 in the anode position adjustment section 102 . The gripping part 103 is formed to have a larger diameter than the anode position adjustment part 102, or has an uneven surface, so that it can be easily gripped by an operator.

When positioning the cathode 16 using the jig 100, the cathode position adjustment section 101 is inserted into the injection port 75, and the end surface of the anode position adjustment section 102 is brought into contact with the front outer surface of the injection port formation plate 74. As a result, the forward and backward positions of the front outer surface of the injection port forming plate 74 and the base end of the cathode position adjusting section 101 are aligned. In this state, by displacing the cathode 16 in the front-rear direction and bringing the front end of the cathode 16 into contact with the tip of the cathode position adjustment section 101, the cathode 16 can be positioned at an appropriate front-rear position.

Then, while maintaining the state in which the cathode position adjustment section 101 is inserted into the injection port 75, the anode 18 is displaced in the vertical direction, and the upper end surface of the anode 18 is brought into contact with the lowest end of the anode position adjustment section 102. 18 can be positioned at appropriate front and rear positions.

As described above, by using the jig 100 of the present embodiment, the front end of the cathode 16 on the side where arc discharge AR is generated and the upper position of the anode 18 on the side where arc discharge AR is generated can be placed in appropriate positions. Can be positioned. In such positioning, compared to positioning by visual inspection by an operator, it is possible to simplify the work and improve positional accuracy, and it is possible to stabilize the output of the arc discharge AR. Furthermore, compared to positioning using a ruler or scale, the work can be done more easily and in a shorter time.

Next, a method for generating water plasma using the water plasma generator 12 of this embodiment will be described. This generation method is carried out in the order of a holding step, a swirling water flow forming step, and an injection step, which will be described below.

First, in the holding step, the insertion shaft portion 61 of the current-carrying member 60 was inserted through the injection port 75, and the rear end of the insertion shaft portion 61 (one end of the current-carrying member 60) was brought into contact with the front end (one end) of the cathode 16. state. At this time, the holding shaft portion 63 of the current-carrying member 60 is placed above the chamber body 70, with the rear end of the holding shaft portion 63 (the other end of the current-carrying member 60) facing the auxiliary anode portion 40. In this state, after lifting the holding member 42 with fingertips or the like against the elastic force of the elastic member 43, the rear end of the holding shaft portion 63 is placed between the contact piece portion 42c of the holding member 42 and the base 41. do. From this state, the lifting of the holding member 42 is released, and the holding shaft portion 63 is held between the contact piece portion 42c and the base 41 by the elastic force of the elastic member 43. Thereby, the current-carrying member 60 is held by the auxiliary anode section 40.

After carrying out the holding process, a whirlpool water flow is formed inside the chamber 17 in the whirlpool water flow formation process. Since the formation of such a whirlpool water flow has been explained above, the description thereof will be omitted here.

After performing the vortex water flow formation step, in the injection step, the switch 48 shown in FIG. 7A is turned on while maintaining the formation of the vortex water flow, and voltage from the DC power source 47 is applied to the anode 18, the auxiliary anode section 40, and the cathode 16. Then, the current-carrying member 60 connecting the auxiliary anode section 40 and the cathode 16 is instantaneously energized, and the current-carrying member 60 is instantaneously vaporized (evaporated) due to the heat generated by the energization. By vaporizing in this way, a current between the auxiliary anode section 40 and the cathode 16 can be induced between the anode 18 and the cathode 16, and as shown in FIG. (See FIG. 5) occurs. Since the arc discharge AR passes through the cavity formed in the vortex water flow, the plasma water forming the vortex water flow is dissociated and ionized, and a jet stream J of water plasma that becomes high energy is injected from the injection port 75.

According to the embodiment described above, by using the auxiliary anode section 40 and the current-carrying member 60 as described above, the anode 18 and the cathode 16 are heated by the current flowing through the current-carrying member 60 immediately or substantially simultaneously after the vaporization of the current-carrying member 60. An arc discharge AR can be generated during this period. In other words, the energizing member 60 that is vaporized by energization can be used as a trigger for arc discharge AR. As a result, even if the anode 18 and cathode 16 are separated as in the water plasma generator 12, the trigger for arc discharge AR can be easily and stably generated, and the startup preparation time of the water plasma generator 12 can be shortened. The startup work can be made easier.

Further, since the current-carrying member 60 is formed into a shaft-like body having the above-described shape, one end (the rear end of the insertion shaft portion 61) contacts the cathode 16, while the other end (the rear end of the holding shaft portion 63) contacts the auxiliary anode portion 40. The auxiliary anode section 40 and the cathode 16 can be electrically connected.

Furthermore, since the auxiliary anode section 40 includes the elastic member 43, it is possible to avoid misalignment of the current-carrying member 60 that is sandwiched between the base 41 and the holding member 42, thereby stabilizing the electrical connection in the current-carrying member 60. .

In addition, since the holding member 42 has the rising portion 42d, the rising portion 42d can be used as a grip area for fingertips when lifting the holding member 42.

In addition, since both the cathode 16 and the anode 18 can be easily positioned by using the jig 100 as described above, the position of the current-carrying member 60 that brings the insertion shaft portion 61 into contact with the cathode 16 is also constant, and arc discharge It can contribute to stabilizing the occurrence of AR triggers.

Note that the present invention is not limited to the above embodiments, and can be implemented with various modifications. In the embodiments described above, the size, shape, direction, etc. illustrated in the accompanying drawings are not limited to these, and can be changed as appropriate within the scope of achieving the effects of the present invention. Other changes can be made as appropriate without departing from the scope of the invention.

For example, in the water plasma generation method of the above embodiment, the holding step was performed after the whirlpool water flow formation step, but it may be performed before the whirlpool water flow formation step.

Further, the material of the current-carrying member 60 may be a metal or alloy other than the above-mentioned aluminum-containing alloy, as long as it can be vaporized before the arc discharge AR occurs, such as tungsten or a tungsten-containing alloy.

Further, the water plasma generator 12 is not limited to being used for decomposition treatment of waste, etc., but can be used for any treatment using water plasma such as thermal spraying.

The present invention has the advantage that an arc discharge trigger can be easily generated between an anode and a cathode to inject water plasma.

12 Water plasma generator 16 Cathode 17 Chamber 18 Anode 40 Auxiliary anode part 41 Base 42 Holding member 42c Contact piece part 42d Standing part 43 Elastic member 60 Current-carrying member 61 Insertion shaft part 62 Connection shaft part 63 Holding shaft part 75 Injection port AR Arc discharge

Claims (4)

A water plasma generating device that injects water plasma by passing an arc discharge inside a vortex water flow,
a chamber in which the vortex water flow is formed and the water plasma is ejected from an injection port;
an anode provided outside the chamber near the injection port;
a cathode having one end inserted into the chamber and generating an arc discharge passing through the vortex water flow between the cathode and the anode;
An auxiliary anode portion electrically connected in parallel with the anode is provided on the outer circumferential side of the chamber, and the auxiliary anode portion holds a current-carrying member that contacts one end of the cathode and passes through the injection port. is provided so as to be able to conduct electricity with the current-carrying member ;
The auxiliary anode section includes a base attached to the outer circumferential side of the chamber, a clamping member that clamps the base and the current-carrying member, and an elastic member that applies a force to press the clamping member toward the base. Characteristic water plasma generator. The elastic member is formed by a band-shaped leaf spring, and one end is connected to the base and the other end is connected to the holding member,
The holding member includes a contact piece portion provided in parallel along the base, and a rising portion extending from the opposite side of the contact piece portion to the direction intersecting the base. The water plasma generator according to claim 1 . A current-carrying member used in the water plasma generator according to claim 1 or claim 2 ,
an insertion shaft portion that contacts one end of the cathode and passes through the injection port;
a holding shaft portion held by the auxiliary anode portion;
A current-carrying member used in a water plasma generator, characterized in that it is formed by a shaft-shaped body including a connecting shaft portion that connects the insertion shaft portion and the holding shaft portion. A water plasma generation method using the water plasma generation device according to claim 1 or 2 , comprising:
a holding step of holding the current-carrying member in the auxiliary anode section while passing the current-carrying member through the injection port and contacting one end of the cathode;
A vortex water flow forming step of forming the vortex water flow inside the chamber before and after the holding step;
After the vortex water flow forming step, a voltage is applied to the anode, the auxiliary anode, and the cathode to energize the current-carrying member, and the heat generated by the energization vaporizes the current-carrying member to form a gap between the anode and the cathode. A method for generating water plasma, comprising: generating an arc discharge, and passing the arc discharge through the inside of the vortex water flow to inject the water plasma.

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