CN114673979B

CN114673979B - High-voltage electrode boiler with changed power regulation mode and power regulation method thereof

Info

Publication number: CN114673979B
Application number: CN202210604115.6A
Authority: CN
Inventors: 郭永生; 赵殿国
Original assignee: Qinhuangdao Youduo Environmental Protection Equipment Manufacturing Co ltd
Current assignee: Qinhuangdao Youduo Environmental Protection Equipment Manufacturing Co ltd
Priority date: 2022-05-31
Filing date: 2022-05-31
Publication date: 2022-08-05
Anticipated expiration: 2042-05-31
Also published as: CN114673979A

Abstract

The invention relates to the technical field of boiler heating, in particular to a high-voltage electrode boiler with a changed power adjusting mode and a power adjusting method thereof, wherein the heating power is adjusted by adjusting the distance between a static electrode and a moving electrode; the device comprises a static electrode, a furnace barrel, a moving electrode, a support and a case, wherein the top end of the furnace barrel is fixedly connected with an upper flange, the upper end of the upper flange is fixedly provided with an upper blind plate, an insulating porcelain bottle penetrates through an opening on the upper blind plate and is fixed on the upper blind plate, and an electrode connecting rod is embedded on the inner side of the insulating porcelain bottle and is connected with the static electrode at the bottom end penetrating into the inner side of the furnace barrel; the lower side of the static electrode is provided with a moving electrode which is fixed on the lifting mechanism, the bottom end of the furnace barrel is fixedly connected with a lower flange, the bottom end of the lower flange is fixedly connected with a lower blind plate, the bottom end of the lower blind plate is connected with a support, and the support is fixedly connected with the case; the lower part of one side of the furnace barrel is provided with a water inlet, and the upper part of one side of the furnace barrel is provided with a water outlet.

Description

High-voltage electrode boiler with changed power regulation mode and power regulation method thereof

Technical Field

The invention relates to the technical field of boiler heating, in particular to a high-voltage electrode boiler with a changed power adjusting mode and a power adjusting method thereof.

Background

The traditional coal heating mode pollutant discharges seriously, leads to the haze lock city in winter. Small and medium coal-fired boilers are gradually eliminated all over the country, and clean energy is changed from coal to electricity. Electrode boiler is the high thermal resistance characteristic of utilizing water, directly with electric energy conversion heat energy and produce a device of hot water or steam, present high-pressure electrode boiler divide into submergence formula and injection formula two kinds, but whatever, its heating method all leans on zero electrode and electrode contact conductive heating, the mode of power regulation is realized by adjusting the area of contact of zero electrode and electrode or adjusting the water level mode, high-pressure electrode boiler furnace body whole height is higher, occupation space is great, the power regulation limitation is stronger.

Disclosure of Invention

In order to solve the technical problems, the invention provides a high-voltage electrode boiler with a changed power adjusting mode and a power adjusting method thereof.

In order to realize the purpose, the invention is realized by adopting the following technical scheme:

the invention provides a high-voltage electrode boiler capable of changing a power regulation mode, which comprises a static electrode, a furnace barrel, an upper flange, a lower flange, a moving electrode, a support and a cabinet, wherein the top end of the furnace barrel is fixedly connected with the upper flange; a moving electrode is arranged on the lower side of the static electrode and fixed on the lifting mechanism, the bottom end of the furnace barrel is fixedly connected with a lower flange, the bottom end of the lower flange is fixedly connected with a lower blind plate, the bottom end of the lower blind plate is connected with a support, and the support is fixedly connected with the case; the lower part of one side of the furnace barrel is provided with a water inlet, and the upper part of one side of the furnace barrel is provided with a water outlet.

In the above technical solution, the static electrode and the moving electrode are both three-phase electrodes.

In the technical scheme, an upper sealing gasket is arranged at the connecting part of the top of the insulating porcelain bottle and the electrode connecting rod, and a lower sealing gasket is arranged at the connecting part of the bottom of the insulating porcelain bottle and the static electrode.

In a possible technical scheme, the lifting mechanism comprises a lifting motor and a lifting plate, the moving electrode is fixed on the lifting plate, the lifting motor is fixedly installed on the upper blind plate, the output end of the lifting motor is downwards connected with a lifting shaft, and the lifting shaft penetrates through the upper blind plate and is connected with the lifting plate.

In the above technical scheme, the lifting motor is installed on the upper blind plate through the fixed cylinder, and a sealing device is connected between the fixed cylinder and the upper blind plate.

In the above technical scheme, the lifting shaft is a T-shaped shaft.

In one possible technical scheme, a protection shield is connected between the outer side of the moving electrode and the outer side of the static electrode.

In a possible technical scheme, the outer side of the furnace barrel is wrapped with a heat insulation layer.

The invention also provides a power adjusting method of the high-voltage electrode boiler, which is realized according to the high-voltage electrode boiler changing the power adjusting mode, the static electrode and the moving electrode are immersed in the water in the boiler barrel at the same time, the high-voltage electrode is electrically connected to the electrode connecting rod at the top end of the boiler barrel, the lifting mechanism is started, the moving electrode can be lifted up and down under the action of the lifting mechanism, so that the distance between the static electrode and the moving electrode is adjusted, the smaller the distance is, the larger the power is, the larger the distance is, the smaller the power is, and the water is heated and the power is adjusted.

Compared with the prior art, the invention has the beneficial effects that:

1. the electrode directly heats by using the resistance of water, the larger the current is, the larger the heat is, and the more hot water or steam is generated; meanwhile, the boiler automatically forms safety protection, so that the safety accident of the old boiler caused by water shortage and dry burning is avoided, and because the current channel between the electrodes is cut off when the water between the three-phase electrode and the electrodes is separated, the current has no transmitted medium, and the steam and the hot water cannot be generated; the boiler control cabinet is equipped, all control circuits such as instruments and the like are connected into the boiler control cabinet, and all control programs can be programmed by adopting a PLC (programmable logic controller), so that unattended operation, safe operation and zero accident are really realized;

2. 100% of electric energy is converted into heat, basically no heat loss exists, no noise, fuel smoke, fly ash and other pollution are generated when equipment runs, zero emission is absolutely environment-friendly, and the device has the characteristics of energy conservation, environmental protection and expenditure saving and accords with the development direction of emission reduction and low carbon; the conventional boiler is provided with the superheater, so that the conventional boiler must be cooled by discharging steam in order to prevent the superheater from being damaged due to overheating, and meanwhile, the boiler has large energy waste because the minimum load of the conventional boiler is about 40 percent generally;

3. the system has the minimum components and electrical control switches, saves the initial distribution investment of a transformer, a low-voltage distribution cabinet, a power cable and the like for users, saves the requirements on fuel pipelines, storage equipment, an energy saver and emission control equipment, and solves the problem of high investment of a low-voltage electric boiler;

4. the novel electrode heating power adjusting mode is adopted, the original high-voltage electrode heating mode is broken through, the adjusting range of the power is 10-100%, the adjusting range is very wide, stepless convenient adjustment can be realized according to the actual needs of users, the structure is simple, the manufacture is convenient, the integral height of the boiler is greatly reduced, and the high-voltage electrode heating device is more suitable for high-voltage electrode heating;

5. the starting is rapid, only dozens of minutes are needed from cold starting to full load, only 1 minute is needed from hot starting to full load, the starting time of the conventional boiler is very long, about 2 hours are generally needed during cold starting, and 15-20 minutes are generally needed in hot starting.

Drawings

FIG. 1 is a schematic cross-sectional structural view of a high pressure electrode boiler with a modified power regulation mode according to an embodiment of the present invention;

FIG. 2 is a schematic side view of a high pressure electrode boiler with a modified power regulation mode according to an embodiment of the present invention;

FIG. 3 is a schematic top view of the upper blind plate mounted on the furnace barrel;

reference numerals: 1. a furnace barrel; 2. an upper flange; 3. an upper blind plate; 4. a lower flange; 5. a lower blind plate; 6. an insulating porcelain insulator; 7. an electrode connecting rod; 8. an upper seal gasket; 9. a lower seal gasket; 10. a static electrode; 11. a moving electrode; 12. a lifting plate; 13. a lift shaft; 14. a sealing device; 15. a fixed cylinder; 16. a hoisting motor; 17. a protection shield; 18. a water inlet; 19. a water outlet; 20. a support; 21. a case.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.

In the description of the present invention, it is to be understood that the terms "radial," "axial," "upper," "lower," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and thus are not to be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The electrode boiler is a device which directly converts electric energy into heat energy and generates hot water or steam by utilizing the high heat resistance characteristic of water, and generally adopts desalted water of a power plant, and certain electrolyte is added to ensure that furnace water has certain resistance and can conduct electricity; however, the higher the conductivity of the furnace water is, the better the conductivity is, otherwise, accidents such as breakdown and the like are easily caused; according to different contact modes of current and electrodes, the electrode boiler mainly has two modes of an immersion type and a jet type, and the immersion type electrode boiler is characterized in that an electrode connected with a high-voltage power supply is directly immersed in boiler water of the boiler for heating; the spray type electrode boiler means that furnace water is directly sprayed on the electrodes for heating, rather than being directly immersed in the furnace water. The power of the electrode boiler in the prior art is adjusted by adjusting the contact area between the zero electrode and the electrode or adjusting the water level, that is, by adjusting the amount of water in contact with the electrode, for example, an immersed electrode boiler can be adjusted by adjusting the position of a protection shield to change the exposed area of the electrode; the spraying electrode boiler can adjust the circulating water quantity by adjusting the frequency of the circulating water pump; the existing high-voltage electrode boiler has the advantages of high overall height of the boiler body, large occupied space and strong power regulation limitation.

The invention innovatively provides a high-voltage electrode boiler with a changed power regulation mode, which is provided based on an immersed electrode boiler, and comprises a furnace barrel 1, an upper flange 2, a lower flange 4, a moving electrode 11, a support 20 and a case 21, wherein the top end of the furnace barrel 1 is fixedly connected with the upper flange 2, the upper end of the upper flange 2 is fixedly provided with an upper blind plate 3, a vertical insulating porcelain bottle 6 penetrates through a hole in the upper blind plate 3 and is fixed on the upper blind plate 3, and an electrode connecting rod 7 is embedded in the inner side of the insulating porcelain bottle 6 and is connected with a static electrode 10 at the bottom end extending into the inner side of the furnace barrel 1; a moving electrode 11 is arranged at the lower side of the static electrode 10, the moving electrode 11 is fixed on the lifting mechanism, the bottom end of the furnace barrel 1 is fixedly connected with a lower flange 4, the bottom end of the lower flange 4 is fixedly connected with a lower blind plate 5, the bottom end of the lower blind plate 5 is connected with a support 20, and the support 20 is fixedly connected with a case 21; a water inlet 18 is arranged at the lower part of one side of the furnace barrel 1, and a water outlet 19 is arranged at the upper part of one side of the furnace barrel 1; low-conductivity water is introduced into the furnace barrel from a water inlet, the static electrode 10 and the moving electrode 11 are immersed in the water at the same time, high-voltage electricity is connected to the electrode connecting rod 7 at the top end of the furnace barrel 1, the water between the two electrodes serves as a resistor, when current passes through electrolyte solution, hot water and steam can be generated, the lifting mechanism is started, the moving electrode 11 can be lifted up and down under the action of the lifting mechanism, and therefore the distance between the static electrode 10 and the moving electrode 11 is adjusted, the smaller the distance is, the larger the power is, the larger the distance is, the smaller the power is, and the heating and power adjustment of the water are realized; the heating mode has small furnace body, reduces the whole height of the furnace body and is simple to manufacture.

The technical principle on which the invention is based is as follows:

the static electrode and the moving electrode are both immersed in water in the furnace barrel, the static electrode is connected with high voltage electricity, the water between the two electrodes is used as a resistor, and when current passes through the electrolyte solution, hot water and steam are generated. The alternating current passes from one phase of the electrodes through the neutral line to the other phase of the electrodes, where the electrolyte solution acts as a conductor, according to the defined formula of resistance and electrical power:

R=ρL/S

P=U²/R

wherein, R represents resistance, rho represents resistivity of the resistance and is determined by the property of the resistor, L represents length of the resistance, and S represents cross-sectional area of the resistance; p represents electric power; u represents a voltage; from this, it is understood that, when ρ and S, U are unchanged, the power is increased when the distance between the two electrodes is decreased, i.e., L is decreased, and the water resistance between the two electrodes is decreased, whereas the power is decreased when the distance between the two electrodes is increased, i.e., L is increased, and the water resistance between the two electrodes is increased.

It should be noted that the high voltage power supply in the present invention is referred to relative to 380/220V, and the voltages in the range of 6-25KV are all in the high voltage range of the present invention; the electrode mounting structure for heating the high-voltage electrode boiler directly adopts high-voltage electric connection to the electrode connecting rod 7, while the conventional electric boiler adopts low-voltage 380/220V and needs to be provided with a step-down transformer and a power distribution system after voltage transformation.

The electrode mounting structure for heating the high-pressure electrode boiler has the advantages that:

2. 100% of electric energy is converted into heat, basically no heat loss exists, no noise, fuel smoke, fly ash and other pollution are generated when equipment runs, zero emission is absolutely realized in an environment-friendly way, and the device has the characteristics of energy conservation, environmental protection and cost saving and accords with the development direction of emission reduction and low carbon; the conventional boiler is provided with the superheater, so that the conventional boiler must be cooled by discharging steam in order to prevent the superheater from being damaged due to overheating, and meanwhile, the boiler has large energy waste because the minimum load of the conventional boiler is about 40 percent generally;

As shown in fig. 1 to 2, according to the high-voltage electrode boiler with a changed power regulation mode of the present invention, during the specific manufacturing, the boiler barrel 1 can be cut by a seamless pipe, so as to ensure the roundness and save the manufacturing time, the upper end of the boiler body is connected by an upper flange 2 and an upper blind plate 3, the lower end of the boiler body is connected by a lower flange 4 and a lower blind plate 5, the flanges and the blind plates are standard parts, the static electrode 10 and the dynamic electrode 11 are cast by stainless steel, so that the heating power can be achieved and the service life can be prolonged; the insulating porcelain bottle 6 has the function of insulating and isolating the electrode connecting rod 7 from the upper blind plate 3, so that the safety performance of the electrode boiler is ensured, preferably, the insulating porcelain bottle 6 is made of high-alumina porcelain, and the smoothness of each contact surface needs to be ensured during manufacturing; the electrode connecting rod 7 is made of the same material as the electrode, so that the conductivity and the service life are ensured; the lifting mechanism may adopt any form of device, apparatus or mechanism, and the present invention is not limited specifically, for example, the lifting mechanism includes but is not limited to a pulley block, a cylinder, a hydraulic cylinder or an electric screw rod; the support 20 can be fixedly connected or detachably connected, and preferably, the support 20 is detachably arranged to facilitate installation operation; specifically, the support 20 may be made of channel steel or seamless tubes, and further preferably, four sets of the support 20 are uniformly arranged, so that the support is uniformly stressed; the water inlet 18 and the water outlet 19 can be connected with the furnace body by adopting seamless pipes, the water inlet 18 is arranged at the lower side of the furnace body and is used for introducing electrolyte water, and the water outlet is arranged at the upper side of the furnace body and ensures high-temperature water outlet of the boiler; after the whole manufacturing is finished, the furnace body is placed on the chassis base and is connected with the chassis base in a fixed connection mode, and stability is guaranteed. The case adopts the plastic-blasting form, and the processing is tailor-made according to furnace body overall dimension, and fixed case panel behind the fixed furnace body, the whole preparation of boiler finishes after the panel is assembled.

In a preferred embodiment of the present invention, the static electrode 10 and the dynamic electrode 11 are three-phase electrodes, and the heating principle is based on three-phase electric high-voltage current to release a large amount of heat energy through furnace water with set conductivity, so as to produce hot water or steam which can be controlled and utilized. The technology solves the problem of dry burning safety of the boiler, if no water exists, the current has no transmitted medium, steam and hot water cannot be generated, and the current channel between the three-phase electrodes is cut off when the water between the three-phase electrodes is separated from the electrodes. As shown in fig. 3, the three-phase electrodes of the static electrode 10 are symmetrically and uniformly arranged at the vertical positions corresponding to the three through holes at the outer side of the upper blind plate 3.

In order to prevent potential safety hazards and prolong the service life of the electrode boiler, an upper sealing gasket 8 is arranged at the connecting part of the top of an insulating porcelain bottle 6 and an electrode connecting rod 7, a lower sealing gasket 9 is arranged at the connecting part of the bottom end of the insulating porcelain bottle 6 and an electrostatic electrode 10, and the sealing gasket can be a polytetrafluoroethylene gasket, so that the electrode boiler has the advantages of high temperature resistance, high pressure resistance, high insulating strength and the like and can be fixed by high-strength bolts.

In a specific embodiment of the present invention, the lifting mechanism includes a lifting motor 16 and a lifting plate 12, the moving electrode 11 is fixed on the lifting plate 12, the lifting motor 16 is fixedly mounted on the upper blind plate 3, an output end of the lifting motor 16 is connected to a lifting shaft 13 downward, the lifting shaft 13 penetrates through the upper blind plate 3 and is connected to the lifting plate 12, and the lifting motor drives the lifting plate to perform lifting motion through the lifting shaft to drive the moving electrode 11 to perform synchronous lifting motion; preferably, the lifting motor 16 is a stepping motor or a servo motor, and needs to be precisely counted to ensure accurate power adjustment; the lifting shaft 13 preferably selects stainless steel T-shaped shaft, ensures to soak in water for a long time for operation, the lifting plate 12 and the lifting shaft 13 are fastened by a lifting nut (not shown in the figure), the lifting nut is made of copper customized nut, ensures to be tightly connected with the T-shaped shaft and operates without jamming, and ensures the stability of power regulation.

As an improvement of the above embodiment, the lifting motor 16 is mounted on the upper blind plate 3 through a fixed cylinder 15, the fixed cylinder is a connecting piece between the lifting motor and the furnace body, the length and diameter of the fixed cylinder need to ensure the safe distance between the fixed cylinder and the static electrode, so as to ensure the safe operation of the boiler, a sealing device 14 is connected between the fixed cylinder 15 and the upper blind plate 3, and the sealing device ensures that the position of the fixed cylinder operates without leakage and is well sealed; the sealing device can be an existing sealing kit purchased from outsourcing, and the components capable of realizing the sealing effect can be suitable for use.

In a preferred embodiment of the present invention, a protection shield 17 is connected between the outer side of the moving electrode 11 and the outer side of the static electrode 10, the protection shield surrounds the static electrode and the moving electrode, so that the static electrode and the moving electrode can be insulated and isolated from the wall of the furnace barrel while contacting with the low conductivity water, the material of the protection shield can be any insulating material, preferably, the protection shield 17 is made of ceramic material; in this embodiment, the protection shield 17 is a vertical cylinder, the bottom end of the protection shield 17 is fixed on the lifting plate 12, the protection shield 17 surrounds the static electrode 10 and the dynamic electrode 11 at the same time, the top end of the protection shield 17 is open and is not connected with the static electrode 10, and the protection shield 17 can move synchronously along with the lifting movement of the lifting plate 12; it should be understood that the shape and arrangement of the protective shield can be adapted to the arrangement and relative position of the zero electrode and the phase electrode.

In a preferred embodiment of the invention, after the furnace body is manufactured, a water adding and pressing test is carried out on the boiler to check whether a water dripping phenomenon exists or not, if so, drainage is needed for repair welding, the pressing test is carried out again after repair welding, and if not, drainage is carried out after pressure maintaining for 30 min; then the outside parcel at furnace barrel 1 sets up the heat preservation (not shown in the figure), and the heat preservation can select arbitrary suitable high temperature resistant insulation material according to the in-service use requirement, can adopt the high temperature resistant aluminium silicate heat preservation that thickness is 80mm for example, guarantees almost no heat loss, and the heat preservation skin adopts the cold drawing packing.

In a preferred embodiment of the invention, the high-pressure electrode boiler is also provided with a control system, and the control system adopts PLC intelligent control and has a one-key starting function.

According to the power adjusting method of the high-voltage electrode boiler, electrolyte water is introduced from the water inlet 18, the static electrode 10 and the moving electrode 11 are immersed in water in the furnace barrel 1 at the same time, the high-voltage electricity is connected to the electrode connecting rod 7 at the top end of the furnace barrel 1, the lifting mechanism is started, the moving electrode 11 can lift up and down under the action of the lifting mechanism, and therefore the distance between the static electrode 10 and the moving electrode 11 is adjusted, the smaller the distance is, the larger the power is, the larger the distance is, the smaller the power is, and the water heating and the power adjusting are achieved.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. A high-voltage electrode boiler capable of changing a power regulation mode comprises a static electrode (10) and is characterized by further comprising a furnace barrel (1), an upper flange (2), a lower flange (4), a dynamic electrode (11), a support (20) and a cabinet (21), wherein the top end of the furnace barrel (1) is fixedly connected with the upper flange (2), the upper end of the upper flange (2) is fixedly provided with an upper blind plate (3), a vertical insulating porcelain bottle (6) penetrates through a hole in the upper blind plate (3) and is fixed on the upper blind plate (3), and an electrode connecting rod (7) is embedded in the inner side of the insulating porcelain bottle (6) and is connected with the static electrode (10) at the bottom end penetrating into the inner side of the furnace barrel (1); an upper sealing gasket (8) is arranged at the connecting part of the top of the insulating porcelain bottle (6) and the electrode connecting rod (7), and a lower sealing gasket (9) is arranged at the connecting part of the bottom end of the insulating porcelain bottle (6) and the static electrode (10); a moving electrode (11) is arranged on the lower side of the static electrode (10), the moving electrode (11) is fixed on a lifting mechanism, the lifting mechanism comprises a lifting motor (16) and a lifting plate (12), the moving electrode (11) is fixed on the lifting plate (12), the lifting motor (16) is fixedly installed on the upper blind plate (3), the output end of the lifting motor (16) is downwards connected with a lifting shaft (13), and the lifting shaft (13) penetrates through the upper blind plate (3) and is connected with the lifting plate (12); the bottom end of the furnace barrel (1) is fixedly connected with a lower flange (4), the bottom end of the lower flange (4) is fixedly connected with a lower blind plate (5), the bottom end of the lower blind plate (5) is connected with a support (20), and the support (20) is fixedly connected with a case (21); a water inlet (18) is arranged at the lower part of one side of the furnace barrel (1), and a water outlet (19) is arranged at the upper part of one side of the furnace barrel (1).

2. The high-pressure electrode boiler with altered power regulation according to claim 1, characterized in that the static electrode (10) and the dynamic electrode (11) are three-phase electrodes.

3. The high-pressure electrode boiler with changed power regulation mode according to claim 1, characterized in that the lifting motor (16) is installed on the upper blind plate (3) through a fixed cylinder (15), and a sealing device (14) is connected between the fixed cylinder (15) and the upper blind plate (3).

4. The high-pressure electrode boiler with modified power regulation according to claim 3, characterized in that the lift shaft (13) is a T-shaped shaft.

5. The high-pressure electrode boiler with variable power regulation according to claim 1, characterized in that a protective shield (17) is connected between the outer side of the moving electrode (11) and the outer side of the static electrode (10).

6. The high-pressure electrode boiler with changed power regulation mode according to claim 1, characterized in that the outside of the furnace barrel (1) is wrapped with an insulating layer.

7. A method for adjusting the power of a high-voltage electrode boiler is characterized in that the method is realized by the high-voltage electrode boiler with the power adjusting mode changed according to any one of claims 1 to 6, a static electrode (10) and a movable electrode (11) are immersed in water in a furnace barrel (1) at the same time, the high-voltage electrode is electrically connected to an electrode connecting rod (7) at the top end of the furnace barrel (1), a lifting mechanism is started, and the movable electrode (11) can be lifted up and down under the action of the lifting mechanism, so that the distance between the static electrode (10) and the movable electrode (11) is adjusted, the smaller the distance, the larger the distance, the smaller the power, the larger the distance and the smaller the power, and the water is heated and the power is adjusted.