Electric heater for heating reduction reactor and mounting structure

Abstract

The utility model discloses an electric heater for heating a reduction reactor, which belongs to the technical field of reduction reactor heating, and is formed by splicing two semi-cylindrical heaters, and each semi-cylindrical heater comprises a shell component, a thermal insulation material and an electric heating pipe, the shell assembly comprises a heat preservation bottom plate, a heat preservation cover plate, an inner shell and an outer shell, wherein the inner shell and the outer shell surround the inner side and the outer side of the semi-cylindrical heater. A thermal insulation material is filled between the inner shell and the outer shell; a plurality of electric heating pipes are arranged on the inner shell, and two ends of the electric heating pipes extend out of the holes of the inner shell and the outer shell. The utility model has the beneficial effects that the hollow cylindrical electric heater is adopted, the electric heating pipe is arranged on the inner wall of the hollow cylindrical electric heater, and heat generated by the electric heating pipe is used for heating the reduction reactor placed at the hollow position of the electric heater, so that compared with the traditional electric heater, the structure is simpler, the weight is lighter, the manufacturing cost is lower, and the energy consumption is lower. And the appearance structure of the shell can be well matched with the reduction reactor needing to be heated.

Description

Technical Field

[0001] The utility model relates to the technical field of reduction reactor heating, in particular to an electric heater for heating a reduction reactor and a mounting structure thereof. Background Art

[0002] In the hydrogen reduction chemical process, the hydrogen reduction reaction needs to be carried out at a temperature of about 320°C, so an electric heater is needed to provide high temperature for heating the reduction reactor. There are two types of traditional electric heaters for heating hydrogen reduction reactors. One type of electric heater is a casting type, in which the electric heating tube is cast in a metal cavity. The other type of electric heater uses a resistance wire for heating. Both types of electric heaters have complex structures, are difficult to manufacture, are heavy, and have high costs. At the same time, the replacement process of heating elements after failure is cumbersome.

[0003] For example, the Chinese invention patent application with publication number CN116887464A discloses a hydrogen-rich reducing gas heater for hydrogen metallurgy, which uses an electromagnetic induction heating coil after power is supplied as a heat source to heat the heating pipe. The heater is too closely integrated with the reduction reactor, that is, the heating is achieved by transporting hydrogen in the heating pipe. The heater also has the problems of high difficulty in processing and manufacturing, and the cumbersome replacement process after a heating element fails.

[0004] In view of this, the inventor conducted in-depth research on this demand, and thus the present case was produced. Utility Model Content

[0005] In order to overcome the problems of the electric heater for heating the hydrogen reduction reactor in the prior art, which is complex in structure, difficult to manufacture, heavy in weight, high in cost, and cumbersome in replacement process after the heating element fails, the utility model provides an electric heater for heating the reduction reactor, which is mainly used to provide the temperature required for the hydrogen reduction reactor during the hydrogen reduction reaction, and has the advantages of simple structure, light weight, low manufacturing cost, etc. The specific technical scheme is as follows:

[0006] An electric heater for heating a reduction reactor, which is a hollow cylindrical electric heater formed by splicing two semi-cylindrical heaters front and back;

[0007] The semi-cylindrical heater comprises a shell assembly, a heat-insulating material and an electric heating tube, wherein the shell assembly comprises a heat-insulating bottom plate, a heat-insulating cover plate, and an inner shell and an outer shell arranged on both sides of the semi-cylindrical heater; the heat-insulating material is filled between the inner shell and the outer shell;

[0008] A plurality of the electric heating tubes are arranged on a side of the inner shell away from the heat-insulating material, and two ends of the electric heating tubes extend out from openings of the inner and outer shells.

[0009] A hollow cylindrical electric heater is adopted, and an electric heating tube is arranged on the inner wall thereof. The heat generated by the electric heating tube is used to heat the reduction reactor placed at the hollow position of the electric heater. Compared with the traditional electric heater, the structure is simpler, the weight is lighter, the manufacturing cost is lower, and the outer structure of the shell can be well matched with the reduction reactor that needs to be heated; at the same time, it can fully meet the requirements of heating the hydrogen reduction reactor to about 320°C, and the temperature shock does not exceed 5°C, so as to ensure the smooth progress of the chemical reaction.

[0010] Preferably, the plurality of electric heating tubes are divided into two rows, upper and lower, and arranged on the inner shell, and the electric heating tubes in each row of the electric heating tubes are vertically and evenly arranged at the same height on the inner shell;

[0011] The electric heating tubes in the same row are connected in parallel and both ends extend out from the openings of the inner and outer shells respectively.

[0012] Preferably, the electric heating tubes in the same row on the semi-cylindrical heater are arranged from left to right with 3 groups of common tubes and 1 group of spare tubes, each group of common tubes is provided with 3 electric heating tubes, each group of spare tubes is provided with 1 electric heating tube, and both ends of each group of common tubes and each group of spare tubes extend from the openings of the inner and outer shells respectively and are fixed with bolts and nuts. Here, the power of each electric heating tube is 0.167kW. The setting of the spare tube can play a temporary backup role when the common tube fails.

[0013] Preferably, the length of each electric heating tube is 330-340 mm, and the diameter is 15-18 mm; preferably, the heating length of each electric heating tube is about 335 mm, and the diameter is 16 mm. The heating power of the electric heating tube is 6 kW, the power supply voltage is 220 V, the heating temperature is 320 ° C ± 20 ° C, the upper limit is 350 ° C, and the temperature control accuracy is ± 5 ° C.

[0014] Preferably, the outer diameter of the shell assembly is 320-340mm, the inner diameter is 160-180mm, the height is 900-1200mm, and the preferred height is 1000mm; the main material of the shell assembly is Q235B, and the preferred outer diameter of the outer shell is 332mm and the thickness is 3mm, the inner diameter of the inner shell is 170mm and the thickness is 3mm, and the outer structure of the shell can be well matched with the reduction reactor that needs to be heated.

[0015] Preferably, the heat-insulating material is aluminum silicate fiber, the thickness of which is just enough to fill between the inner shell and the outer shell, preferably with a thickness of 75 mm, which can effectively prevent heat loss and ensure that the electric heater has a high energy conversion efficiency.

[0016] Preferably, a first junction box is installed on the top and bottom outer walls of the outer shell, a second junction box is installed on the middle outer wall of the outer shell, and both ends of the electric heating tube extend from the openings of the inner and outer shells and are respectively connected to the first junction box and the second junction box.

[0017] Preferably, a plurality of hinge bolt assemblies for splicing the two semi-cylindrical heaters into a hollow cylindrical electric heater are provided at the front and rear splicing positions of the two semi-cylindrical heaters.

[0018] Preferably, the thermal insulation cover plate comprises a cover plate and a thermal insulation plate arranged above and below, and the cover plate and the thermal insulation plate are mounted on the outer shell by bolts, nuts and washers.

[0019] The utility model also provides an installation structure of an electric heater, comprising a reduction reactor, two sets of upper and lower installation rails distributed on both sides of the reduction reactor, and the above-mentioned electric heater;

[0020] A support roller assembly is provided at positions corresponding to the mounting track on both sides of the outer shell of each of the semi-cylindrical heaters, and the support roller assembly is installed on the mounting track and can slide along the mounting track;

[0021] When the two semi-cylindrical heaters are spliced ​​into a hollow cylindrical electric heater, the reduction reactor is located in the middle of the two semi-cylindrical heaters.

[0022] A handle is provided on the outer shell. When the electric heater is used, the two semi-cylindrical heaters are moved along the track toward the reduction reactor by the handle until the reduction reactor is surrounded, and then the two semi-cylindrical heaters are fastened by the hinge bolt assembly, and then powered on for heating until the required reaction temperature is reached.

[0023] Beneficial effects:

[0024] The beneficial effects produced by adopting the technical solution of the utility model are as follows:

[0025] (1) A hollow cylindrical electric heater is used, and an electric heating tube is arranged on the inner wall thereof. The heat generated by the electric heating tube is used to heat the reduction reactor placed at the hollow position of the electric heater. Compared with the traditional electric heater, the structure is simpler, the weight is lighter, the manufacturing cost is lower, and the outer shape structure of the shell can be well matched with the reduction reactor to be heated; at the same time, it can fully meet the requirements of heating the hydrogen reduction reactor to about 320°C, and the temperature shock does not exceed 5°C, so as to ensure the smooth progress of the chemical reaction.

[0026] (2) The electric heater in this application has been successfully applied to the hydrogen reduction reaction process, providing a reaction temperature of 320°C for the hydrogen reduction reaction and controlling the temperature surge within 5°C;

[0027] (3) Compared with the resistance wire electric heater, the weight of the heater in the present application is reduced by one third, and the manufacturing cost is reduced by one third; at the same time, when a failure occurs in an individual electric heating tube, it is also very convenient to disassemble and replace the electric heating tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 This is a schematic diagram of the inner structure of a preferred semi-cylindrical heater of the utility model;

[0030] Figure 2 This is a schematic diagram of the outer structure of a preferred semi-cylindrical heater of the utility model;

[0031] Figure 3 This is a schematic diagram of the structure of a preferably spliced ​​hollow cylindrical electric heater of the utility model;

[0032] Figure 4 This is a schematic diagram of a preferred thermal insulation cover structure of the utility model;

[0033] Figure 5 This is the electrical wiring diagram of the internal electric heating tube of the preferred semi-cylindrical heater of the utility model. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0035] This embodiment adopts a hollow cylindrical electric heater, and an electric heating tube is arranged on its inner wall, and the heat generated by the electric heating tube is used to heat the reduction reactor placed at the hollow position of the electric heater. Compared with the traditional electric heater, it has a simpler structure, lighter weight, lower manufacturing cost, and the outer shape structure of the shell can be well matched with the reduction reactor that needs to be heated. The specific implementation is as follows:

[0036] like Figure 1-5 As shown, an electric heater 10 for heating a reduction reactor is a hollow cylindrical electric heater formed by splicing two semi-cylindrical heaters 1 front and back;

[0037] The semi-cylindrical heater 1 comprises a shell assembly 11, a heat-insulating material 12 and an electric heating tube 13. The shell assembly 11 comprises a heat-insulating bottom plate 111, a heat-insulating cover plate 112, and an inner shell 113 and an outer shell 114 arranged on both sides of the semi-cylindrical heater 1; the heat-insulating material 12 is filled between the inner shell 113 and the outer shell 114;

[0038] A plurality of the electric heating tubes 13 are arranged on the inner shell 113 at a side away from the heat insulating material 12 , and two ends of the electric heating tubes 13 extend out from openings of the inner shell 113 and the outer shell 114 .

[0039] As a preferred embodiment, a plurality of the electric heating tubes 13 are arranged in two rows, upper and lower, on the inner shell 113, such as Figure 1 As shown, the electric heating tubes 13 in each row of the electric heating tubes 13 are vertically and evenly arranged at the same height on the inner shell 113;

[0040] The electric heating tubes 13 in the same row are connected in parallel and both ends extend out from the openings of the inner shell 113 and the outer shell 114 respectively.

[0041] As a preferred embodiment, Figure 5 As shown, the electric heating tubes 13 in the same row on the semi-cylindrical heater 1 are arranged from left to right with 3 groups of common tubes 131 and 1 group of spare tubes 132. Each group of common tubes 131 is provided with 3 electric heating tubes 13, and each group of spare tubes 132 is provided with 1 electric heating tube 13. Both ends of each group of common tubes 131 and each group of spare tubes 132 extend from the openings of the inner and outer shells, respectively, and are fixed with bolts and nuts. Here, the power of each electric heating tube 13 is 0.167kW. The setting of the spare tube 132 can play a temporary backup role when the common tube fails.

[0042] As a preferred embodiment, each of the electric heating tubes 13 has a length of 330-340 mm and a diameter of 15-18 mm; preferably, the heating length of each electric heating tube 13 is about 335 mm and the diameter is 16 mm. The heating power of the electric heating tube 13 is 6 kW, the power supply voltage is 220 V, the heating temperature is 320°C ± 20°C, the upper limit is 350°C, and the temperature control accuracy is ±5°C.

[0043] As a preferred embodiment, the outer diameter of the shell assembly 11 is 320-340mm, the inner diameter is 160-180mm, the height is 900-1200mm, and the preferred height is 1000mm; the main material of the shell assembly 11 is Q235B, and the outer diameter of the outer shell 114 is preferably 332mm, and the thickness is 3mm, and the inner diameter of the inner shell 113 is 170mm, and the thickness is 3mm. The outer structure of the shell can be well matched with the reduction reactor that needs to be heated.

[0044] Here, the heat-insulating material 12 is preferably aluminum silicate fiber, and its thickness is just enough to fill between the inner shell 113 and the outer shell 114, preferably with a thickness of 75 mm, which can effectively prevent heat loss and ensure that the electric heater has a high energy conversion efficiency.

[0045] As a preferred embodiment, a first junction box 14 is installed on the top and bottom outer walls of the outer shell 114, a second junction box 15 is installed on the middle outer wall of the outer shell 114, and both ends of the electric heating tube 13 extend from the openings of the inner and outer shells and are respectively connected to the first junction box 14 and the second junction box 15.

[0046] As a preferred embodiment, Figure 3 As shown, a plurality of hinge bolt assemblies 16 for splicing the two semi-cylindrical heaters 1 into a hollow cylindrical electric heater are arranged at the front and rear splicing positions of the two semi-cylindrical heaters 1 .

[0047] As a preferred embodiment, Figure 4 As shown, the heat-insulating cover plate 112 includes a cover plate 115 and a heat-insulating plate 116 disposed above and below, and the cover plate 115 and the heat-insulating plate 116 are installed on the outer shell 114 through bolts, nuts and washers 117.

[0048] This embodiment also provides an installation structure of an electric heater, comprising a reduction reactor 100, two sets of upper and lower installation rails 101 distributed on both sides of the reduction reactor 100, and the above-mentioned electric heater 10;

[0049] A support roller assembly 118 is provided at positions corresponding to the mounting track 101 on both sides of the outer shell 114 of each of the semi-cylindrical heaters 1, and the support roller assembly 118 is installed on the mounting track 101 and can slide along the mounting track 101;

[0050] When the two semi-cylindrical heaters 1 are spliced ​​into a hollow cylindrical electric heater, the reduction reactor 100 is located in the middle of the two semi-cylindrical heaters 1 .

[0051] A handle 17 is provided on the outer shell 114. When the electric heater is used, the two semi-cylindrical heaters are moved along the track toward the reduction reactor by the handle until the reduction reactor is surrounded, and then the two semi-cylindrical heaters are fastened by the hinge bolt assembly, and then powered on for heating until the required reaction temperature is reached.

[0052] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An electric heater for heating a reduction reactor, characterized in that: It is a hollow cylindrical electric heater formed by splicing two semi-cylindrical heaters front and back; The semi-cylindrical heater comprises a shell assembly, a heat-insulating material and an electric heating tube, wherein the shell assembly comprises a heat-insulating bottom plate, a heat-insulating cover plate, and an inner shell and an outer shell arranged on both sides of the semi-cylindrical heater; the heat-insulating material is filled between the inner shell and the outer shell; A plurality of the electric heating tubes are arranged on a side of the inner shell away from the heat-insulating material, and two ends of the electric heating tubes extend out from openings of the inner and outer shells.

2. The electric heater for heating a reduction reactor according to claim 1, characterized in that: A plurality of the electric heating tubes are arranged on the inner shell in two rows, one above the other, and the electric heating tubes in each row are evenly arranged vertically at the same height on the inner shell; The electric heating tubes in the same row are connected in parallel and both ends extend out from the openings of the inner and outer shells respectively.

3. The electric heater for heating a reduction reactor according to claim 2, characterized in that: The electric heating tubes in the same row on the semi-cylindrical heater are arranged from left to right with 3 groups of common tubes and 1 group of spare tubes, each group of common tubes is provided with 3 electric heating tubes, each group of spare tubes is provided with 1 electric heating tube, and both ends of each group of common tubes and each group of spare tubes extend out from the openings of the inner and outer shells respectively.

4. The electric heater for heating a reduction reactor according to claim 1, characterized in that: Each of the electric heating tubes has a length of 330-340 mm and a diameter of 15-18 mm.

5. The electric heater for heating a reduction reactor according to claim 1, characterized in that: The outer diameter of the shell assembly is 320-340 mm, the inner diameter is 160-180 mm, and the height is 900-1200 mm.

6. The electric heater for heating a reduction reactor according to claim 1, characterized in that: The thermal insulation material is aluminum silicate fiber.

7. The electric heater for heating a reduction reactor according to claim 1, characterized in that: A first junction box is installed on the top and bottom outer walls of the outer shell, a second junction box is installed on the middle outer wall of the outer shell, and both ends of the electric heating tube extend from the openings of the inner and outer shells and are respectively connected to the first junction box and the second junction box.

8. The electric heater for heating a reduction reactor according to claim 1, characterized in that: A plurality of movable bolt assemblies for splicing the two semi-cylindrical heaters into a hollow cylindrical electric heater are arranged at the front and rear splicing positions of the two semi-cylindrical heaters.

9. The electric heater for heating a reduction reactor according to claim 1, characterized in that: The heat-insulating cover plate comprises a cover plate and a heat-insulating plate arranged above and below, and the cover plate and the heat-insulating plate are installed on the outer shell through bolts, nuts and washers.

10. An installation structure for an electric heater, characterized in that: It comprises a reduction reactor, two sets of upper and lower mounting rails distributed on both sides of the reduction reactor, and an electric heater as claimed in any one of claims 1 to 9; A support roller assembly is provided at positions corresponding to the mounting track on both sides of the outer shell of each of the semi-cylindrical heaters, and the support roller assembly is installed on the mounting track and can slide along the mounting track; When the two semi-cylindrical heaters are spliced ​​into a hollow cylindrical electric heater, the reduction reactor is located in the middle of the two semi-cylindrical heaters.

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