Structure for non-neutral point grounding of fully immersed electrode boiler

Abstract

The application discloses a structure for non-neutral point grounding of a full-immersion electrode boiler, which comprises an isolation room, a furnace shell, phase electrodes and zero electrodes, the furnace shell is arranged in the isolation room, the phase electrodes are arranged in the furnace shell, and the zero electrodes are arranged in the furnace shell, and the structure is characterized in that the structure further comprises a first insulating support, a second insulating support and a conductive connecting piece, the first insulating support is arranged in the furnace shell, the zero electrodes are directly or indirectly arranged on the first insulating support, the second insulating support is arranged on the furnace shell, the second insulating support is located outside the furnace shell, the second insulating support is located between the furnace shell and the ground, the zero electrodes are connected through the conductive connecting piece, the zero electrodes are connected together as a neutral point, the furnace shell is used as a zero point, insulating rings are arranged on water outlets and water inlets of the furnace shell, the insulating rings are located between an outer wall of the furnace shell and an inner wall of the isolation room, the isolation room is grounded, and the furnace shell is not grounded.

Description

Technical Field

[0001] This invention relates to the field of electrode boilers, and more particularly to a structure for non-neutral grounding of a fully submerged electrode boiler. Background Technology

[0002] Patent publication CN115654734A discloses an installation structure for an electrode boiler with an ungrounded neutral point. In this structure, insulating tubes (numbered 7 in the attached drawings) are installed at both the inlet and outlet of the electrode boiler. Since the insulating tubes are insulated, the entire tube acts as a water resistance tube, using the water inside as resistance. Furthermore, the zero-point electrode in this electrode boiler structure is directly mounted to the boiler shell via metal. Therefore, in this electrode boiler installation structure, the entire boiler shell is the neutral point, while the isolation chamber (a metal cover) is equivalent to the zero-point point. The neutral point and the zero-point point are connected... The insulating pipe (i.e., water resistance pipe) is used to dissipate the zero-sequence voltage. Since the furnace shell of the electrode boiler acts as the neutral point, when three-phase imbalance occurs (including phase loss) (i.e., the furnace shell is energized, and the voltage is relatively high), conductivity will occur between the furnace shell and the phase electrode (reference numeral 22 in the document; the entire structure of the phase electrode is shown in patent publication CN110068001B, also called the electrode rod) passing through a portion of the furnace shell wall. Conductivity will also occur between the furnace shell and the lifting rod (reference numeral 12 in the document) passing through a portion of the furnace shell wall. This will damage the phase electrode and the lifting rod, affecting their service life. Furthermore, if the isolation room has poor grounding and three-phase imbalance occurs, the isolation room may become energized (and the voltage may be very high), posing a significant personal safety hazard. Summary of the Invention

[0003] To address the aforementioned problems, this invention proposes a structure for non-neutral grounding of a fully submerged electrode boiler.

[0004] The technical solution adopted in this invention is as follows:

[0005] A structure for non-neutral grounding of a fully submerged electrode boiler includes an isolation chamber, a furnace shell, phase electrodes, and a zero-position electrode. The furnace shell is disposed within the isolation chamber, the phase electrodes are disposed within the furnace shell, and the zero-position electrode is disposed within the furnace shell. The structure also includes a first insulating support, a second insulating support, and a conductive connector. The first insulating support is disposed within the furnace shell, and the zero-position electrode is directly or indirectly disposed on the first insulating support. The second insulating support is disposed on the furnace shell, located outside the furnace shell and between the furnace shell and the ground. The zero-position electrodes are connected together via the conductive connector, forming a neutral point. The furnace shell serves as the zero-position point. Insulating rings are attached to both the outlet and inlet of the furnace shell, located between the outer wall of the furnace shell and the inner wall of the isolation chamber. The isolation chamber is grounded, and the furnace shell is not in contact with the isolation chamber and is not grounded.

[0006] In this design, the furnace shell is made of metal. The zero-point electrodes inside the furnace shell are directly fixed inside the shell via a first insulating component. None of the zero-point electrodes are in contact with the inner wall of the furnace shell. All zero-point electrodes are connected via conductive connectors. The furnace shell itself is prevented from being grounded by a second insulating support. The outer wall of the furnace shell is not in contact with the inner wall of the isolation chamber. The furnace shell serves as the zero-point location, and the connected zero-point electrodes serve as the neutral point. The boiler water inside the furnace shell acts as a resistor. When a three-phase imbalance occurs, the relatively large boiler water content inside the furnace shell means that the neutral point and the zero-point location are... The resistance of the furnace shell is relatively large. Therefore, even when three-phase imbalance occurs, the zero-sequence current generated is very small due to the effect of the boiler water inside the furnace shell (i.e., resistance). According to the formula: Current = Voltage (caused by three-phase imbalance or phase loss) / Resistance (i.e., the resistance of the boiler water), the larger the resistance, the smaller the current. Thus, even when three-phase imbalance occurs, the voltage on the furnace shell is very low. This structure can reduce the probability of the furnace shell becoming energized and the magnitude of the voltage on the furnace shell when energized. This significantly improves the safety of equipment passing through the furnace shell and extends the service life of the equipment. Since the furnace shell does not contact the isolation room, the possibility of the isolation room becoming energized is basically avoided (even if it is energized, the voltage is greatly reduced). However, to ensure safety, the isolation room is still grounded, and the isolation room is protected by a 4Ω resistor.

[0007] In summary, this structure connects the zero-point electrodes inside the furnace shell together as a neutral point, and uses the furnace shell itself as the zero point. The furnace water inside the furnace shell acts as the resistance between the neutral point and the zero point, which greatly reduces the probability of the furnace shell and the isolation room becoming energized. Even when the furnace shell and the isolation room are energized, the voltage is relatively low.

[0008] Optionally, a support plate is provided inside the furnace shell, the first insulating support is disposed on the support plate, and the zero-position electrode is disposed on the first insulating support.

[0009] A support plate is disposed inside the housing, and a first insulating support member is disposed on the support plate. The support plate is used to support the first insulating support member, and the first insulating support member is used to fix the zero-position electrode.

[0010] Optionally, it also includes a first base plate and a second base plate, the first base plate being disposed on the outer wall of the furnace shell, the second base plate being disposed on the ground, the second insulating support being fixed together with the first base plate, and the second insulating support being slidably engaged with the second base plate.

[0011] Specifically, the first base plate is fixed to the furnace, the second base plate is fixed to the ground, one end of the second insulating support is fixed to the first base plate, and the other end of the second insulating support is slidably engaged with the second base plate. The second insulating support is used to support the entire furnace body. Since the furnace shell will inevitably vibrate and shift during operation, the second insulating support and the second base plate are slidably engaged, so that the second insulating support can slide relative to the second base plate. This can prevent the second insulating support from breaking and ensure that the second insulating support can always stably support the entire furnace shell.

[0012] Optionally, a flexible connecting pipe is also included, wherein the flexible connecting pipe is installed on both the water outlet and the water inlet of the furnace shell, and the insulating ring is connected to the flexible connecting pipe.

[0013] Specifically, the flexible connector is made of metal and has a certain degree of torsion capability. Because the insulating ring is fixed relative to the isolation chamber, while the furnace shell will vibrate and shift during operation, the insulating ring is fixed together with the inlet and outlet using the flexible connector. The torsion capability of the flexible connector ensures the sealing between the insulating ring and the inlet and outlet.

[0014] Optionally, it also includes a water pipe connected to the insulating ring, the water pipe passing through the isolation chamber.

[0015] Specifically, the water pipe connected to the insulating ring passes through the wall of the isolation room, and the water pipe and the wall of the isolation room are in a relatively fixed state.

[0016] Optionally, the furnace shell may also include a heat exchanger and a circulating pump. The inlet of the furnace shell is directly or indirectly connected to the circulating pump, and the outlet of the furnace shell is directly or indirectly connected to the heat exchanger. The heat exchanger is connected to the circulating pump, and both the heat exchanger and the circulating pump are grounded.

[0017] Specifically, the high-temperature boiler water inside the furnace shell first enters the heat exchanger, where it is cooled down (through heat exchange with other refrigerants) before entering the circulating pump. The circulating pump then pumps the water back into the furnace shell through the inlet. Because the boiler water has a certain probability of being electrified, both the heat exchanger and the circulating pump are grounded to ensure safety, using a grounding protection resistor of less than 1Ω.

[0018] Optionally, a water supply component may also be included, which is directly or indirectly connected to the water inlet of the furnace shell.

[0019] The purpose of setting up the water replenishment component is to facilitate the timely replenishment of furnace water into the furnace shell as needed.

[0020] Optionally, the isolation room is equipped with an inspection door.

[0021] The purpose of installing access doors is to facilitate timely maintenance.

[0022] Optionally, the zero-position electrode is a cylindrical zero-position electrode, and the electrode head of the phase electrode is located inside the zero-position electrode.

[0023] Optionally, the number of zero-position electrodes is an integer multiple of 3, and the number of phase electrodes is equal to the number of zero-position electrodes.

[0024] The beneficial effects of this invention are: by connecting the zero-point electrodes in the furnace shell together as a neutral point, and using the furnace shell itself as the zero point, and utilizing the furnace water in the furnace shell as the resistance between the neutral point and the zero point, the probability of the furnace shell and the isolation room being energized is greatly reduced, and even when the furnace shell and the isolation room are energized, the voltage is relatively low. Attached image description:

[0025] Figure 1 This is a simplified schematic diagram of the non-neutral grounding structure used in a fully submerged electrode boiler;

[0026] Figure 2 yes Figure 1 A simplified enlarged diagram of point A in the middle;

[0027] Figure 3 This is a simplified schematic diagram showing the position of the zero-position electrode inside the furnace shell;

[0028] Figure 4 This is a simplified schematic diagram of an electrical-integrated and air-source heat pump system.

[0029] The attached figures are labeled as follows: 1. Isolation chamber; 101. Inspection door; 2. Furnace shell; 201. Water outlet; 202. Water inlet; 3. Flexible connecting pipe; 4. Insulating ring; 5. Water pipe; 6. Phase electrode; 601. Electrode head; 7. Zero-position electrode; 8. First insulating support; 9. Support plate; 10. Heat exchanger; 11. Circulating pump; 12. Diaphragm pressure tank; 13. Atmospheric pressure diaphragm tube; 14. Constant pressure pump; 15. First base plate; 16. Second insulating support; 17. Second base plate; 18. Conductive connector; 19. Gas boiler; 20. Second heat exchanger; 21. Air source heat pump; 22. Third heat exchanger; 23. Hot water storage tank; 24. External supply pipe; 25. Supplementary pipe. Detailed implementation method:

[0030] The present invention will now be described in detail with reference to the accompanying drawings.

[0031] Example 1

[0032] As attached Figure 1 Appendix Figure 2 and appendix Figure 3 As shown, a structure for non-neutral grounding of a fully submerged electrode boiler includes an isolation chamber 1, a furnace shell 2, phase electrodes 6, and a zero-position electrode 7. The furnace shell 2 is disposed within the isolation chamber 1, the phase electrodes 6 are disposed within the furnace shell 2, and the zero-position electrode 7 is disposed within the furnace shell 2. The structure is characterized by further including a first insulating support 8, a second insulating support 16, and a conductive connector 18. The first insulating support 8 is disposed within the furnace shell 2, and the zero-position electrode 7 is directly or indirectly disposed on the first insulating support 8. The second insulating support 16... The component 16 is installed on the furnace shell 2, and the second insulating support component 16 is located on the lower outside of the furnace shell 2. The second insulating support component 16 is located between the furnace shell 2 and the ground. The zero-position electrodes 7 are connected by a conductive connector 18. The zero-position electrodes 7 are connected together as a neutral point. The furnace shell 2 is used as the zero point. The water outlet 201 and water inlet 202 of the furnace shell 2 are both connected to an insulating ring 4. The insulating ring 4 is located between the outer wall of the furnace shell 2 and the inner wall of the isolation room 1. The isolation room 1 is grounded. The furnace shell 2 does not contact the isolation room and is not grounded.

[0033] In this design, the furnace shell 2 is made of metal. The zero-position electrodes 7 inside the furnace shell 2 are directly fixed inside the furnace shell 2 via the first insulating component. All zero-position electrodes 7 are not in contact with the inner wall of the furnace shell 2. All zero-position electrodes 7 are connected via conductive connectors (metal plates), which are not in contact with the inner wall of the furnace shell. The furnace shell 2 itself is prevented from being grounded by the second insulating support 16. The outer wall of the furnace shell 2 is not in contact with the inner wall of the isolation chamber 1. The furnace shell 2 serves as the zero-position point, and the connected zero-position electrodes 7 serve as the neutral point. The boiler water inside the furnace shell 2 acts as a resistor. When a three-phase imbalance occurs, due to the relatively high content of boiler water inside the furnace shell 2... A relatively large resistance means that the resistance between the neutral point and the zero-sequence point is relatively large. Therefore, even when three-phase imbalance occurs, due to the effect of the boiler water inside the furnace shell 2 (i.e., resistance), according to the formula Current = Voltage (caused by three-phase imbalance or phase loss) / Resistance (i.e., the resistance of the boiler water), it can be known that the larger the resistance value, the smaller the current. Therefore, even when three-phase imbalance occurs, the generated zero-sequence current is very small, and even if the furnace shell 2 is energized, the voltage on the furnace shell 2 is very low. Thus, this structure can reduce the probability of the furnace shell 2 becoming energized and the magnitude of the voltage on the furnace shell 2 when energized. This significantly improves the safety of equipment passing through the furnace shell 2 and extends the service life of the equipment. Since the furnace shell 2 does not contact the isolation room 1, the possibility of the isolation room 1 becoming energized is basically avoided (even if it is energized, the voltage is significantly reduced). However, to ensure safety, the isolation room 1 is still grounded, and the isolation room 1 uses a 4Ω resistor (attached). Figure 1 (Identified by the letter R1) Protective grounding.

[0034] In summary, this structure connects the zero-point electrodes 7 inside the furnace shell 2 together as a neutral point, and the furnace shell 2 itself is used as the zero point. The furnace water inside the furnace shell 2 is used as the resistance between the neutral point and the zero point, which greatly reduces the probability of the furnace shell 2 and the isolation room 1 being energized. Even when the furnace shell 2 and the isolation room 1 are energized, the voltage is relatively low.

[0035] As attached Figure 1 Appendix Figure 2 and appendix Figure 3 As shown, a support plate 9 is provided inside the furnace shell 2, a first insulating support 8 is provided on the support plate 9, and a zero-position electrode 7 is provided on the first insulating support 8.

[0036] The support plate 9 is disposed inside the housing, and the first insulating support 8 is disposed on the support plate 9. The support plate 9 is used to support the first insulating support 8, and the first insulating support 8 is used to fix the zero electrode 7.

[0037] As attached Figure 1 Appendix Figure 2 and appendix Figure 3As shown, it also includes a first base plate 15 and a second base plate 17. The first base plate 15 is disposed on the outer wall of the furnace shell 2, and the second base plate 17 is disposed on the ground. The second insulating support 16 is fixed together with the first base plate 15, and the second insulating support 16 and the second base plate 17 are slidably engaged together.

[0038] Specifically, the first base plate 15 is fixed to the furnace, the second base plate 17 is fixed to the ground, one end of the second insulating support 16 is fixed to the first base plate 15, and the other end of the second insulating support 16 is slidably engaged with the second base plate 17. The second insulating support 16 is used to support the entire furnace body. Since the furnace shell 2 will inevitably vibrate and shift during operation, the second insulating support 16 and the second base plate 17 are slidably engaged, so that the second insulating support 16 can slide relative to the second base plate 17. This can prevent the second insulating support 16 from breaking and ensure that the second insulating support 16 can always stably support the entire furnace shell 2, ensuring that the furnace shell will not come into contact with the ground.

[0039] As attached Figure 1 Appendix Figure 2 and appendix Figure 3 As shown, it also includes a flexible hose 3. Flexible hoses 3 are installed on the water outlet 201 and water inlet 202 of the furnace shell 2, and an insulating ring 4 is connected to the flexible hose 3.

[0040] Specifically, the flexible connector 3 is made of metal and has a certain degree of torsion capability. Because the insulating ring 4 is in a fixed state relative to the isolation chamber 1, while the furnace shell 2 will vibrate and shift during operation, the insulating ring 4 is fixed together with the water inlet 202 and the water outlet 201 using the flexible connector 3. The torsion capability of the flexible connector 3 ensures the sealing between the insulating ring 4 and the water inlet 202 and the water outlet 201.

[0041] As attached Figure 1 Appendix Figure 2 and appendix Figure 3 As shown, it also includes a water pipe 5 (metal pipe), which is connected to an insulating ring 4 and penetrates the wall of the isolation room 1.

[0042] Specifically, the water pipe 5 connected to the insulating ring 4 passes through the wall of the isolation room 1, and the water pipe 5 and the wall of the isolation room 1 are in a relatively fixed state.

[0043] As attached Figure 1 Appendix Figure 2 and appendix Figure 3 As shown, it also includes a heat exchanger 10 and a circulating pump 11. The water inlet 202 of the furnace shell 2 is directly or indirectly connected to the circulating pump 11, and the water outlet 201 of the furnace shell 2 is directly or indirectly connected to the heat exchanger 10. The heat exchanger 10 is connected to the circulating pump 11, and both the heat exchanger 10 and the circulating pump 11 are grounded.

[0044] Specifically, the high-temperature boiler water inside the furnace shell 2 first enters the heat exchanger 10, where it exchanges heat with other refrigerants, flowing from the auxiliary refrigerant... Figure 1 (Indicated by the half-arrow in the image) After cooling, it enters the circulating pump 11, and then is pumped by the circulating pump 11 into the inlet 202, thus returning to the furnace shell 2. (See attached image) Figure 1 The direction of the arrow indicates the flow of the boiler water. Because the boiler water has a certain probability of becoming electrified, for safety reasons, both heat exchanger 10 and circulating pump 11 are grounded using a resistor of less than 1Ω (see attached image). Figure 1 The protective grounding is marked with R1 and R2 respectively.

[0045] Appendix Figure 1 The three grounding resistors are all labeled with the letter R.

[0046] As attached Figure 1 Appendix Figure 2 and appendix Figure 3 As shown, it also includes a water supply component, which is directly or indirectly connected to the water inlet 202 of the furnace shell 2.

[0047] The purpose of setting up the water supply component is to facilitate timely replenishment of boiler water into the furnace shell 2 as needed. The specific water supply component includes a water supply pipe, a constant pressure pump 14, an atmospheric pressure diaphragm tank, and a diaphragm pressure tank 12. The water supply pipe is connected to the circulation pump 11, and the constant pressure pump 14, the atmospheric pressure diaphragm pump, and the diaphragm pressure pump are connected to the water supply pipe.

[0048] As attached Figure 1 Appendix Figure 2 and appendix Figure 3 As shown, an inspection door 101 is installed on the isolation room 1.

[0049] The purpose of setting up the inspection door 101 is to facilitate timely inspection and maintenance.

[0050] As attached Figure 1 Appendix Figure 2 and appendix Figure 3 As shown, the zero-position electrode 7 is a cylindrical zero-position electrode 7, and the electrode head 601 of the phase electrode 6 is located inside the zero-position electrode 7.

[0051] As attached Figure 1 Appendix Figure 2 and appendix Figure 3 As shown, the number of zero-position electrodes 7 is an integer multiple of 3, and the number of phase electrodes 6 is equal to the number of zero-position electrodes 7.

[0052] The specific number of zero-position electrodes 7 can be 3, 6, or 9, as long as it is an integer multiple of 3.

[0053] Specifically, in this embodiment, the first insulating support and the second insulating support can be made of insulating grease, ceramic, or other composite insulating materials.

[0054] Example 2

[0055] A method for grounding the non-neutral point of a fully submerged electrode boiler, using the structure shown in Example 1.

[0056] Example 3

[0057] An electrical-integrated and air-source heat pump coupled heating system, see attached. Figure 4 As shown, it includes an electrode boiler heat generation module, a gas boiler module, an air source heat pump module, and a hot water storage tank. The electrode boiler heat generation module is the structure shown in Example 1. In Example 1, one side of the heat exchanger 10 is connected to the furnace shell 2, and the other side of the heat exchanger is connected to the hot water storage tank 23. The cold water in the hot water storage tank 23 enters the heat exchanger 10 for heating and then returns to the hot water storage tank. The gas-fired boiler module includes a gas-fired boiler 19 and a second heat exchanger 20. One side of the second heat exchanger 20 is connected to the gas-fired boiler 19 via a pipe, and the other side is connected to a hot water storage tank 23 via a pipe. Hot water produced by the gas-fired boiler 19 enters the second heat exchanger 20 for cooling and then returns to the gas-fired boiler 19. Low-temperature water in the hot water storage tank 23 enters the second heat exchanger 20 for heating and then returns to the hot water storage tank 23. The air-source heat pump module includes an air-source heat pump 21 and a third heat exchanger 22. One side of the third heat exchanger is connected to the air-source heat pump via a pipe, and the other side is connected to the hot water storage tank via a pipe. Hot water from the air-source heat pump enters the third heat exchanger for cooling and then returns to the air-source heat pump, while low-temperature water from the hot water storage tank enters the third heat exchanger for heating and then returns to the hot water storage tank. This system can coordinate the use of gas, electricity, and air energy for thermal energy storage when needed. (Appendix) Figure 4 The straight line in the middle represents the pipeline. A water pump is installed between the second heat exchanger and the gas boiler (to allow water to flow from the gas boiler into the second heat exchanger and back to the gas boiler). A water pump is also installed between the third heat exchanger and the air source heat pump (to allow water to flow from the air source heat pump into the third heat exchanger and back to the air source heat pump). Similarly, water pumps are installed between the heat exchangers, the second heat exchanger, and the third heat exchanger and the hot water storage tank. The hot water storage tank is also connected to an external supply pipe 24 for supplying hot water from the storage tank, and a replenishment pipe 25 for replenishing water into the storage tank.

[0058] Example 4

[0059] A thermal storage system for an electrode boiler used for peak shaving in a thermal power plant, wherein the electrode boiler adopts a non-neutral grounding structure as shown in Example 1 for a fully submerged electrode boiler.

[0060] The above description is merely a preferred embodiment of the present invention and does not limit the scope of patent protection of the present invention. Any equivalent modifications made based on the content of the present invention specification, whether directly or indirectly applied to other related technical fields, are similarly included within the scope of protection of the present invention.

Claims

1. A structure for non-neutral grounding of a fully submerged electrode boiler, comprising an isolation chamber, a furnace shell, phase electrodes, and a zero-position electrode, wherein the furnace shell is disposed within the isolation chamber, the phase electrodes are disposed within the furnace shell, and the zero-position electrode is disposed within the furnace shell, characterized in that, It also includes a first insulating support, a second insulating support, and a conductive connector. The first insulating support is disposed inside the furnace shell, and the zero-position electrode is directly or indirectly disposed on the first insulating support. The second insulating support is disposed on the furnace shell and is located outside the furnace shell, between the furnace shell and the ground. The zero-position electrodes are connected to each other through the conductive connector, and the zero-position electrodes are connected together as a neutral point. The furnace shell is used as the zero point. Insulating rings are connected to both the water outlet and the water inlet of the furnace shell. The insulating rings are located between the outer wall of the furnace shell and the inner wall of the isolation room. The isolation room is grounded, and the furnace shell is not in contact with the isolation room and is not grounded. A support plate is provided inside the furnace shell, the first insulating support is provided on the support plate, and the zero-position electrode is provided on the first insulating support. It also includes a first base plate and a second base plate. The first base plate is disposed on the outer wall of the furnace shell, and the second base plate is disposed on the ground. The second insulating support is fixed together with the first base plate and slidably engaged with the second base plate.

2. The structure for non-neutral grounding of a fully submerged electrode boiler as described in claim 1, characterized in that, It also includes a flexible connector, which is installed on both the water outlet and the water inlet of the furnace shell, and the insulating ring is connected to the flexible connector.

3. The structure for non-neutral grounding of a fully submerged electrode boiler as described in claim 1, characterized in that, It also includes a water pipe connected to the insulating ring, the water pipe passing through the isolation room.

4. The structure for non-neutral grounding of a fully submerged electrode boiler as described in claim 1, characterized in that, It also includes a heat exchanger and a circulating pump. The water inlet of the furnace shell is directly or indirectly connected to the circulating pump, and the water outlet of the furnace shell is directly or indirectly connected to the heat exchanger. The heat exchanger is connected to the circulating pump, and both the heat exchanger and the circulating pump are grounded.

5. The structure for non-neutral grounding of a fully submerged electrode boiler as described in claim 1, characterized in that, It also includes a water supply component, which is directly or indirectly connected to the water inlet of the furnace shell.

6. The structure for non-neutral grounding of a fully submerged electrode boiler as described in claim 1, characterized in that, The isolation room is equipped with an inspection door.

7. The structure for non-neutral grounding of a fully submerged electrode boiler as described in claim 1, characterized in that, The zero-position electrode is a cylindrical zero-position electrode, and the electrode head of the phase electrode is located inside the zero-position electrode.

8. The structure for non-neutral grounding of a fully submerged electrode boiler as described in claim 1, characterized in that, The number of zero-position electrodes is an integer multiple of 3, and the number of phase electrodes is equal to the number of zero-position electrodes.

Images