Electric heating wire connecting structure in high-voltage small-power solid electric heat accumulator

Abstract

The utility model discloses an electric heating wire connecting structure in a high-voltage small-power solid electric heat accumulator, which comprises a solid heat accumulator, an electric heating wire group, a high-temperature insulating layer and a moisture-proof insulating layer, and is characterized in that the solid heat accumulator is a device which is formed by building solid energy storage bricks and has a certain space volume and heat storage capacity. A plurality of electric heating wire groups arranged in a solid heat accumulator are connected in series in three phases (A phase, B phase and C phase) to reach a designed resistance value, and then the three phases are connected in a star-shaped connection method or a triangular connection method to complete the access of a heating system of equipment. And the high-temperature insulating layer and the moisture-proof insulating layer respectively solve the problems of high temperature of more than 300 DEG C of the solid electric heat accumulator and high-voltage insulation of the heating wire group in an initial state. According to the structure, the realizability of the high-voltage small-power solid electric heat accumulator is achieved, the solid heat accumulator is more compact, a three-phase power supply is integrated, the occupied area is smaller, and arrangement is more flexible.

Description

Technical Field

[0001] The utility model relates to the technical field of solid electric heat storage, in particular to a connection structure of heating wires in a high-voltage and low-power solid electric heat storage body. Background Art

[0002] So far, solid electric heat storage furnaces with working voltages of 66kV and 110kV have been in stable grid connection and operation for more than 7 years. The power of a single solid electric heat storage furnace of this voltage level is generally greater than 40MW, with the advantages of large heat storage power, simple structure, small line loss, and stable and reliable operation. This high-power equipment is suitable for the grid of the national power grid with strong access capacity. For those local power grids of 66kV and 110kV, it is difficult to access solid electric heat storage furnaces greater than 40MW. It is necessary to design a solid electric heat storage furnace with a power less than 40MW that can work at 66kV and 110kV voltages to meet the needs of users who use 66kV and 110kV high-voltage solid electric heat storage furnaces to access the local power grid. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the purpose of the utility model is to provide a connection structure for the heating wire in a high-voltage, low-power solid electric thermal storage body, aiming to solve the problem in the prior art that when a 66kV and 110kV solid electric thermal storage boiler is connected to a power level of less than 40MW, the heating wire in the solid thermal storage body works under high voltage and low current conditions and optimizes the connection.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A connection structure of a heating wire in a high-voltage, low-power solid electric heat storage body, comprising a solid heat storage body built of solid refractory bricks, the solid electric heat storage body comprising:

[0006] Reserved ventilation holes are arranged in parallel and uniform array in the solid heat storage body to form holes for placing the heating wires;

[0007] The heating wire grouping is formed by connecting the vertically adjacent and parallel heating wires in parallel;

[0008] The heating wire group is vertically arranged in a single row in the reserved ventilation hole of the solid heat storage body, and is composed of 2 to 50 heating wire groups that are adjacent to each other and connected in series vertically, and are connected to a multi-phase power supply at intervals, and the two-phase power supply at the end of the multi-phase power supply is connected to an external power supply through a delta connection;

[0009] The electric heating wire can be a spiral or serpentine electric heating component made from a single round electric heating alloy wire, or can be made from a plurality of round electric heating alloy wires that are wound or braided into a wire harness and then processed into a spiral or serpentine electric heating component. It can also be made from a single layer or a composite of multiple layers of electric heating alloy flat strips into a serpentine electric heating component and placed in a reserved ventilation hole.

[0010] Furthermore, it also includes:

[0011] The high-temperature insulation layer is built with magnesia refractory bricks and the upper part is connected to the solid heat storage body.

[0012] Furthermore, it also includes:

[0013] The moisture-proof insulating layer is composed of rod-shaped electrical ceramic insulating pillars, which are arranged at the lower part of the high-temperature insulating layer and connected to the bearing foundation, and sandwich the high-temperature insulating layer together with the solid heat storage body.

[0014] The technical solution adopted by the utility model has the following beneficial effects:

[0015] In this application, by designing a new type of heating wire connection structure, the problem of the heating wire group working stably under high voltage and low current conditions when high voltage 66kV and 110kV are connected to a solid electric heat storage furnace below 40MW can be solved; the angle wiring method is adopted to solve the requirement of the minimum safety distance between the three phases (phase A, phase B, phase C) under high voltage, and the three phases can be connected without gaps, ensuring the reliable and safe operation of the equipment and achieving a smaller footprint. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present invention will become easy to understand. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0017] Figure 1 It is a schematic diagram of the connection structure of the heating wire in the high-voltage low-power solid electric heat storage body of the utility model;

[0018] Figure 2 It is a schematic diagram of the grouped connection structure of the heating wires of the utility model;

[0019] Figure 3 This is a schematic diagram of the installation of the heating wire group of the utility model in the reserved ventilation hole of the solid heat storage body;

[0020] Description of Figure Numbers:

[0021] 1. Solid heat storage body, 2. Heating wire group, 3. High temperature insulation layer, 4. Moisture-proof insulation layer, 5. Reserved ventilation holes, 6. Heating wire, 7. Heating wire grouping; DETAILED DESCRIPTION

[0022] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. If not specifically stated, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0023] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present invention should be the common meanings understood by the technicians in the field to which the present invention belongs. In this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Terms such as "connection" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. The terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "include..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0024] This embodiment provides a connection structure of the heating wire in a high voltage and low power solid electric heat storage body, such as Figures 1 to 3As shown, the connection structure of the heating wire in the high-voltage low-power solid electric heat storage body includes a solid heat storage body 1, a heating wire group 2, a high-temperature insulation layer 3, a moisture-proof insulation layer 4, a reserved ventilation hole 5, a heating wire 6, and a heating wire group 7. The solid heat storage body 1 is arranged on the upper part of the high-temperature insulation layer 3 and connected to the high-temperature insulation layer 3. The heating wire group 2 is arranged in the reserved ventilation holes of the uniform array in the solid heat storage body 1 and connected to the solid heat storage body 1. The high-temperature insulation layer 3 is arranged between the moisture-proof insulation layer 4 and the solid heat storage body 1, and is connected to the solid heat storage body 1 at the upper part and to the moisture-proof insulation 4 layer at the lower part. The moisture-proof insulation layer 4 is arranged at the lower part of the high-temperature insulation layer 3 and is connected to the bearing foundation. The reserved ventilation holes 5 are arranged in a parallel and uniform array in the solid heat storage body to form holes for placing the heating wires and can ventilate and transfer heat energy. The electric heating wire 6 is an electric heating alloy with a working temperature of more than 1000°C. It can be processed into a spiral or serpentine electric heating component from a single round electric heating alloy wire, or it can be processed into a spiral or serpentine electric heating component from multiple round electric heating alloy wires after being wound or woven into a wire harness, or it can be processed into a serpentine electric heating component from a single layer or a multi-layer electric heating alloy flat strip that is composited together and placed in the reserved ventilation hole 5. The electric heating wire group 7 is composed of vertically adjacent parallel electric heating wires connected in parallel.

[0025] In a specific embodiment, Figures 1 to 3 As shown, the solid heat storage body 1 is a device built of solid energy storage bricks with a certain spatial volume and heat storage capacity. Its structure is provided with reserved ventilation holes 5 that are uniformly arrayed and penetrated during the masonry process. These are reserved holes for the later installation of the heating wire group 2, and are also ventilation and heat dissipation holes during the operation of the device. The solid heat storage body 1 is arranged on the high-temperature insulation layer 3 and is reliably connected thereto.

[0026] In a specific embodiment, Figures 1 to 3As shown, the heating wire 6 arranged in the reserved ventilation hole 5 of the solid heat storage body 1 is connected in parallel by n wires to form a heating wire group 7, and then the heating wire group 2 is formed by m heating wire groups 7 connected in series head to tail. The n in the heating wire 6 can be composed of 1 to 30 wires connected in parallel. The m in the heating wire group 7 can be arranged in series vertically in sequence by 2 to 50 wires. The heating wire group 2 is connected head to head or tail to tail to form a horizontal series structure to achieve the designed resistance value of each phase (phase A, phase B, phase C), and then the three phases are connected in star connection or triangle connection to complete the heating system access of the equipment. When designing the heating system, it should be ensured that the voltage difference between the two ends of the heating wire group 2 in the working state should be less than 1500V, and the net spacing between the heating wire groups 2 in two adjacent columns should not be less than 100mm. The technical route of this embodiment is to adopt a series connection structure of the heating wire group 2 of the three-phase delta connection method. This structure enables the three-phase solid heat storage body 1 to be completely built together without considering the safety distance between phases (phase A, phase B, phase C), so as to realize a smaller footprint of the solid heat storage body 1, and thus make the equipment more flexible and occupy less space when the high voltage is connected. The operation is also relatively reliable. In this embodiment, the A-phase power supply is connected to one end of the first column of vertical heating wire groups 2 set on one side of the solid heat storage body 1, and the other end is connected in series with one end of the heating wire group 2 of the adjacent second column, and N groups of heating wire groups 2 are connected in series in sequence to reach the designed resistance value (N is not less than 40), and connected to the B-phase power supply, and then from the B-phase power supply as the starting position, the heating wire group 2 is connected in series to the C-phase power supply in sequence, and then from the C-phase power supply as the starting position, the heating wire group 2 is connected in series to the A-phase power supply in sequence, wherein the two A-phase power supplies are respectively led to the two ends by the external power supply, and finally the triangle connection of the phase power supply is completed.

[0027] In a specific embodiment, Figure 1 As shown, the high-temperature insulating layer 3 solves the problem of high-voltage insulation of the heating wire group 2 arranged in the solid thermal storage body 1 to the ground when the solid thermal storage body 1 is in a high-temperature state (above 300 degrees Celsius). Its structure is arranged between the solid thermal storage body 1 and the moisture-proof insulating layer, and is built with magnesium bricks containing MgO ≥ 92%, and has the ability of high-temperature insulation and high-temperature bearing the load of the solid thermal storage body 1.

[0028] In a specific embodiment, Figure 1As shown, the moisture-proof insulating layer 4 is in the initial state of the solid thermal storage body 1 and the high-temperature insulating layer 3, that is, just built, to solve the problem of high-voltage insulation of the heating wire group 2 set in the solid thermal storage body 1 to the ground. Because the solid thermal storage body 1 and the high-temperature insulating layer 3 have a certain moisture content due to the process and material molding in the initial state, the early insulation of the heating wire group 2 is very low and cannot pass the high-voltage withstand test. This problem is not solved. A moisture-proof insulating layer 4 is set at the bottom of the device. The moisture-proof insulating layer 4 is composed of a number of supporting insulators of the same voltage, which can not only solve the problem of insulation of the initial device to the ground, but also solve the problems of moisture-proof and load-bearing of the device, so that the solid thermal storage body 1 and the high-temperature insulating layer 3 are completely isolated from the ground foundation.

[0029] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A heating wire connection structure in a high-voltage, low-power solid electric heat storage body, comprising a solid heat storage body built of solid refractory bricks, characterized in that: The solid electric heat storage body comprises: Reserved ventilation holes are arranged in parallel and uniform array in the solid heat storage body to form holes for placing the heating wires; The heating wire grouping is formed by connecting the vertically adjacent and parallel heating wires in parallel; The heating wire group is vertically arranged in a single row in the reserved ventilation hole of the solid heat storage body, and is composed of 2 to 50 heating wire groups that are adjacent to each other and connected in series vertically, and are connected to a multi-phase power supply at intervals, and the two-phase power supply at the end of the multi-phase power supply is connected to an external power supply through a delta connection; The electric heating wire is a spiral or serpentine electric heating component made from a single round electric heating alloy wire, or a plurality of round electric heating alloy wires are wound or braided into a wire harness and then processed into a spiral or serpentine electric heating component, or a single-layer or composite multi-layer electric heating alloy flat strip is processed into a serpentine electric heating component and placed in the reserved ventilation hole.

2. The heating wire connection structure in a high-voltage, low-power solid electric heat storage body according to claim 1, characterized in that: Also includes: The high-temperature insulation layer is built with magnesia refractory bricks and the upper part is connected to the solid heat storage body.

3. The heating wire connection structure in a high-voltage, low-power solid electric heat storage body according to claim 1, characterized in that: Also includes: The moisture-proof insulating layer is composed of rod-shaped electrical ceramic insulating pillars, which are arranged at the lower part of the high-temperature insulating layer and connected to the bearing foundation, and sandwich the high-temperature insulating layer together with the solid heat storage body.

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