A high-efficiency heat exchange pipeline of a sleeve-type spiral flow channel electromagnetic heater

Abstract

The present invention discloses a high-efficiency heat exchange pipeline of a sleeve-type spiral flow channel electromagnetic heater, comprising an annular spiral outer tube arranged on the outer periphery of a magnetic column wound with a coil, a spiral heating tube arranged inside the annular spiral outer tube, a heating outer flow channel is formed between the annular spiral outer tube and the spiral heating tube, and a heating inner flow channel is formed inside the spiral heating tube; a spiral guide strip is arranged between the annular spiral outer tube and the spiral heating tube, and a spiral plug-in is arranged inside the spiral heating tube. The present invention is provided with an annular spiral outer tube and a spiral heating tube, and adopts a double-layer sleeve structure, so that the inner and outer sides of the spiral heating tube heat two parts of the fluid respectively, the heat exchange area is increased, and the heat exchange efficiency of the electromagnetic heater is greatly improved, and the spiral guide strip and the spiral plug-in effectively destroy the laminar boundary layer inside and outside the annular spiral outer tube, so that the fluid reaches sufficient turbulence, thereby promoting the heat exchange effect between the fluid and the spiral heating tube.

Description

Technical Field

[0001] The invention belongs to the technical field of electromagnetic heater heat exchange pipelines, and in particular relates to a high-efficiency heat exchange pipeline of a sleeve-type spiral flow channel electromagnetic heater. Background Art

[0002] The working principle of electromagnetic heater is based on Faraday's law of electromagnetic induction, that is, a changing magnetic field will generate an induced electromotive force in a closed circuit. Due to the change of the magnetic field, an induced current will be generated in the induced conductor. When this induced current passes through the conductor, it will generate Joule heat and heat up the conductor. Compared with resistive heaters, electromagnetic heaters have faster heating rates, clean heating characteristics, direct access to high voltage electricity, contactless heating capabilities, precise temperature control capabilities, good material adaptability, etc.

[0003] The application of electromagnetic heaters in the field of molten salt electric heating is gaining more and more attention. One of the most common application structures is to wrap a coil passing alternating current around the outside of a metal pipe. The fluid flows through the pipe, and the metal pipe is heated by the change in the magnetic field, thereby heating the fluid in the pipe. Another application structure is to transform a single straight pipe flow channel into a spiral coil flow channel with a larger heat exchange area, which greatly improves the heating efficiency of the electromagnetic heater.

[0004] An energized coil is placed on the periphery of a heating container (or pipe), and the fluid inside the heating element takes away the heat. Chinese patent CN208063501U discloses an electromagnetic induction heater, which consists of an energized coil, an insulating layer, a heat-insulating layer, a tank body to be heated, and materials in the tank. After the coil is energized, the temperature of the metal tank body rises to heat the materials in the tank. The structure is relatively simple and the heating speed is fast; however, this technical solution still has the following shortcomings: the heating container is limited by the diameter of the coil, and the internal heat exchange area is small, the temperature gradient from the edge of the fluid to the center of the fluid is extremely large, and the heat exchange is extremely uneven. It needs to be used in conjunction with a stirring device, otherwise it is difficult to achieve the engineering requirements of molten salt heating.

[0005] The heating container (or pipeline) is placed outside the energized coil heating container. Chinese patent CN219164762U discloses a spiral pipeline electromagnetic induction heater. The electromagnetic heater structure consists of a energized coil, an insulating layer, a thermal insulation layer, a cooling structure, a spiral metal coil and materials in the coil pipeline. After the coil is energized, the spiral metal coil heats up to heat the material in the pipeline. It is basically free from the limitations caused by the coil diameter, can withstand high voltage, and can be directly connected to the three-phase electricity of the national power grid, but the magnetic field strength will be lower than that inside the coil.

[0006] The above two solutions have the following problems: (1) The fluid temperature gradient in the heat exchange pipe is large, resulting in uneven heat exchange; (2) The heat exchange pipe is prone to scaling, which reduces the heat exchange efficiency and even damages the equipment, and the pipe is difficult to clean; (3) The heating efficiency is extremely low. The temperature of the outer wall of the heat exchange pipe is not only not utilized, but also brings a great burden to the insulation and heat dissipation;

[0007] To this end, we propose a high-efficiency heat exchange pipeline of a sleeve-type spiral flow channel electromagnetic heater. Summary of the invention

[0008] The object of the present invention is to provide a high-efficiency heat exchange pipe of a sleeve-type spiral flow channel electromagnetic heater to solve the problems raised in the above background technology.

[0009] To achieve the above-mentioned object, the present invention provides the following technical solutions: a high-efficiency heat exchange pipeline of a sleeve-type spiral flow channel electromagnetic heater, comprising an annular spiral outer tube arranged on the outer periphery of a magnetic column wound with a coil, a spiral heating tube arranged inside the annular spiral outer tube, a heating outer flow channel formed between the annular spiral outer tube and the spiral heating tube, and a heating inner flow channel formed inside the spiral heating tube;

[0010] A spiral guide strip is arranged between the annular spiral outer tube and the spiral heating tube, and a spiral insert is arranged inside the spiral heating tube.

[0011] Preferably, the spiral guide strip is spirally arranged on the inner wall of the annular spiral outer tube, and the spiral guide strip spirally divides and guides the heating outer flow channel.

[0012] Preferably, the annular spiral outer tube and the spiral guide strip are an integrated structure, and the annular spiral outer tube and the spiral guide strip form an annular spiral grooved outer tube.

[0013] Preferably, the spiral heating tube is sleeved inside the annular spiral outer tube and is placed at the center of the annular spiral outer tube through the spiral guide strip.

[0014] Preferably, the annular spiral outer tube and the spiral guide strip are both made of non-conductive insulating materials that do not isolate the magnetic field.

[0015] Preferably, the spiral heating tube is a high-efficiency electric heating tube made of conductive material or magnetic material.

[0016] Preferably, the spiral insert is a spiral blade structure adapted to the interior of the spiral heating tube.

[0017] Preferably, the spiral angles of the annular spiral outer tube, the spiral heating tube, the spiral guide strip and the spiral insert are the same.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention is provided with an annular spiral outer tube and a spiral heating tube, and adopts a double-layer casing structure. A heating outer flow channel is formed between the annular spiral outer tube and the spiral heating tube, and a heating inner flow channel is formed in the spiral heating tube. The annular spiral outer tube is arranged on the outer periphery of a magnetic column wound with a coil. After the coil is energized, a magnetic field is formed in the space, and the spiral heating tube starts to heat. The double-layer casing structure divides the fluid into two parts. One part of the fluid flows through the heating outer flow channel, and the outer side of the spiral heating tube heats this part of the fluid. The other part of the fluid flows through the heating inner flow channel, and the inner side of the spiral heating tube heats this part of the fluid. Finally, the two parts of the fluid are mixed after flowing out of the heat exchange pipe, so that the inner and outer sides of the spiral heating tube heat the two parts of the fluid respectively, so that the heat generated by the outer surface of the spiral heating tube is also utilized, so that the heat exchange efficiency of the entire electromagnetic heater is greatly improved. The heat exchange area on the outer side of the spiral heating tube is larger than the heat exchange area on the inner side, and the heat exchange area is increased. Considering the heat exchange area factor alone, the heat exchange efficiency is improved by more than 100%;

[0020] 2. The present invention adopts a double-layer casing structure, which improves the heat exchange efficiency and greatly reduces the cooling and heat insulation problems of the electromagnetic heater. There is no need to design an additional cooling structure, and the limit temperature of the heat exchange pipe is reduced, reducing the risk of heat damage to the heat exchange pipe. There is a gap between the annular spiral outer tube and the spiral heating tube 3 to control the flow rate of the fluid outside the spiral heating tube, further increasing the heat exchange efficiency while also using a faster flow rate to increase the anti-scaling and descaling ability of the spiral heating tube.

[0021] 3. The present invention is provided with a spiral guide strip between the annular spiral outer tube and the spiral heating tube. The spiral guide strip enhances the guiding effect of the fluid in the heating outer flow channel, effectively destroys the laminar boundary layer between the annular spiral outer tube and the spiral heating tube, and makes the fluid reach sufficient turbulence, thereby promoting the heat exchange effect between the fluid and the spiral heating tube; and the annular spiral outer tube and the spiral guide strip form an annular spiral grooved outer tube, which can autonomously prevent and clean scale, self-compensate for temperature stress, save resources, and reduce the manufacturing cost, the risk of damage caused by temperature stress, and the difficulty of maintenance and cleaning caused by dirt after being put into use;

[0022] 4. The present invention provides a spiral plug-in in the spiral heating tube to increase the disturbance of the fluid in the heating inner flow channel, destroy the laminar boundary layer inside the spiral heating tube, make the fluid reach sufficient turbulence, promote the heat exchange between the fluid and the spiral heating tube, and can autonomously prevent and clean scale, self-compensate for temperature stress, save resources, and reduce the manufacturing cost, the risk of damage caused by temperature stress, and the difficulty of maintenance and cleaning caused by dirt after being put into use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the three-dimensional structure of the heat exchange pipeline of the present invention;

[0025] Figure 3 It is a schematic diagram of the three-dimensional structure of the spiral plug-in of the present invention;

[0026] Figure 4 It is a schematic cross-sectional structural diagram of the heat exchange pipe of the present invention;

[0027] Figure 5 It is a schematic cross-sectional structural diagram of the annular spiral outer tube of the present invention;

[0028] Figure 6 This is the temperature simulation diagram of the traditional single-side heat exchange spiral heat exchange pipe;

[0029] Figure 7 This is a temperature simulation diagram of the high-efficiency heat exchange pipeline of the present invention.

[0030] In the figure: 1. magnetic column; 2. annular spiral outer tube; 3. spiral heating tube; 4. heating outer flow channel; 5. heating inner flow channel; 6. spiral guide strip; 7. spiral plug-in. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See also Figure 1-Figure 5 The present invention provides a high-efficiency heat exchange pipeline of a sleeve-type spiral flow channel electromagnetic heater, comprising an annular spiral outer tube 2 arranged on the outer periphery of a magnetic column 1 wound with a coil, a spiral heating tube 3 arranged in the annular spiral outer tube 2, the spiral heating tube 3 is sleeved in the annular spiral outer tube 2, and is placed at the center of the annular spiral outer tube 2 through a spiral guide strip 6, the spiral heating tube 3 is a high-efficiency electric heating tube made of a conductive material or a magnetic material, a heating outer flow channel 4 is formed between the annular spiral outer tube 2 and the spiral heating tube 3, a heating inner flow channel 5 is formed in the spiral heating tube 3, and the spiral angles of the annular spiral outer tube 2, the spiral heating tube 3, the spiral guide strip 6 and the spiral plug-in 7 are the same;

[0033] The present invention is provided with an annular spiral outer tube 2 and a spiral heating tube 3, and adopts a double-layer casing structure. A heating outer flow channel 4 is formed between the annular spiral outer tube 2 and the spiral heating tube 3, and a heating inner flow channel 5 is formed in the spiral heating tube 3. The annular spiral outer tube 2 is arranged on the outer periphery of a magnetic column 1 wound with a coil. After the coil is energized, a magnetic field is formed in the space, and the spiral heating tube 3 starts to heat. The double-layer casing structure divides the fluid into two parts. One part of the fluid flows through the heating outer flow channel 4, and the outer side of the spiral heating tube 3 heats this part of the fluid. The other part of the fluid flows through the heating inner flow channel 5, and the inner side of the spiral heating tube 3 heats this part of the fluid. Finally, the two parts of the fluid are mixed after flowing out of the heat exchange pipe, so that the inner and outer sides of the spiral heating tube 3 heat the two parts of the fluid respectively, so that the heat generated by the outer surface of the spiral heating tube 3 is also utilized, so that the heat exchange efficiency of the entire electromagnetic heater is greatly improved. The heat exchange area on the outer side of the spiral heating tube 3 is larger than the heat exchange area on the inner side, and the heat exchange area is increased. Considering the heat exchange area factor alone, the heat exchange efficiency is improved by more than 100%.

[0034] The present invention adopts a double-layer casing structure, which improves the heat exchange efficiency and greatly reduces the cooling and heat insulation problems of the electromagnetic heater. There is no need to design an additional cooling structure, and the limit temperature of the heat exchange pipe is reduced, reducing the risk of heat damage to the heat exchange pipe.

[0035] There is a gap between the annular spiral outer tube 2 and the spiral heating tube 3, which controls the flow rate of the fluid outside the spiral heating tube 3, further increasing the heat exchange efficiency while also utilizing a faster flow rate to increase the anti-scaling and descaling capabilities of the spiral heating tube 3;

[0036] A spiral guide strip 6 is arranged between the annular spiral outer tube 2 and the spiral heating tube 3. The spiral guide strip 6 is spirally arranged on the inner side wall of the annular spiral outer tube 2. The annular spiral outer tube 2 and the spiral guide strip 6 are an integrated structure. The annular spiral outer tube 2 and the spiral guide strip 6 form an annular spiral grooved outer tube. The spiral guide strip 6 spirally separates and guides the heating outer flow channel 4. The annular spiral outer tube 2 and the spiral guide strip 6 are both made of non-conductive insulating materials that do not isolate the magnetic field.

[0037] The present invention is provided with a spiral guide strip 6 between the annular spiral outer tube 2 and the spiral heating tube 3. The spiral guide strip 6 enhances the guiding effect of the fluid in the heating outer flow channel 4, effectively destroys the laminar boundary layer between the annular spiral outer tube 2 and the spiral heating tube 3, and makes the fluid reach sufficient turbulence, thereby promoting the heat exchange effect between the fluid and the spiral heating tube 3.

[0038] The annular spiral outer tube 2 and the spiral guide strip 6 form an annular spiral grooved outer tube, which can prevent and clean scales autonomously and compensate for temperature stress by itself, saving resources while reducing manufacturing costs, the risk of damage caused by temperature stress, and the difficulty of maintenance and cleaning caused by dirt after being put into use;

[0039] A spiral insert 7 is provided inside the spiral heating tube 3, and the spiral insert 7 is a spiral blade structure adapted to the interior of the spiral heating tube 3;

[0040] The present invention provides a spiral plug-in 7 in the spiral heating tube 3 to increase the disturbance of the fluid in the heating inner flow channel 5, destroy the laminar boundary layer inside the spiral heating tube 3, make the fluid reach sufficient turbulence, promote the heat exchange between the fluid and the spiral heating tube 3, and can autonomously prevent and clean scale, self-compensate for temperature stress, save resources, and at the same time reduce the manufacturing cost, the risk of damage caused by temperature stress, and the difficulty of maintenance and cleaning caused by dirt after being put into use.

[0041] like Figure 6 The figure shows the temperature simulation diagram of the traditional single-side heat exchange spiral heat exchange pipe. Figure 7 It is a temperature simulation diagram of the high-efficiency heat exchange pipeline of the present invention;

[0042] Depend on Figure 6 and Figure 7 It can be seen that the temperature comparison table of the inlet and outlet of the traditional single-side heat exchange spiral heat exchange pipe and the high-efficiency heat exchange pipe of the present invention is:

[0043]

[0044] It can be seen from the above table that the temperature results calculated under the same working conditions and two different structures are as follows: the specific data are shown in the table. The outlet temperature of the traditional single-sided heat exchange spiral heat exchange pipe is increased by 232.07°C, and the outlet temperature of the double-sided high-efficiency heat exchange pipe of the present invention is only increased by 131.24°C. This indirectly confirms that more heat will be taken away by the fluid by using the double-sided high-efficiency heat exchange pipe of the present invention, that is, it has a better heat exchange effect.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency heat exchange pipeline of a sleeve-type spiral flow channel electromagnetic heater, characterized in that: It comprises an annular spiral outer tube (2) arranged on the outer periphery of a magnetic column (1) wound with a coil, a spiral heating tube (3) being arranged inside the annular spiral outer tube (2), a heating outer flow channel (4) being formed between the annular spiral outer tube (2) and the spiral heating tube (3), and a heating inner flow channel (5) being formed inside the spiral heating tube (3); A spiral guide strip (6) is provided between the annular spiral outer tube (2) and the spiral heating tube (3), and a spiral insert (7) is provided inside the spiral heating tube (3); The spiral guide strip (6) is spirally arranged on the inner side wall of the annular spiral outer tube (2), and the spiral guide strip (6) spirally divides and guides the heating outer flow channel (4); The annular spiral outer tube (2) and the spiral guide strip (6) are an integrated structure, and the annular spiral outer tube (2) and the spiral guide strip (6) form an annular spiral grooved outer tube; The spiral heating tube (3) is sleeved inside the annular spiral outer tube (2) and is placed at the center of the annular spiral outer tube (2) via the spiral guide strip (6).

2. The high-efficiency heat exchange pipeline of the sleeve-type spiral flow channel electromagnetic heater according to claim 1 is characterized in that: The annular spiral outer tube (2) and the spiral guide strip (6) are both made of non-conductive insulating material that does not isolate the magnetic field.

3. The high-efficiency heat exchange pipeline of the sleeve-type spiral flow channel electromagnetic heater according to claim 1 is characterized in that: The spiral heating tube (3) is a high-efficiency electric heating tube made of conductive material or magnetic material.

4. The high-efficiency heat exchange pipeline of the sleeve-type spiral flow channel electromagnetic heater according to claim 1 is characterized in that: The spiral insert (7) is a spiral blade structure adapted to the interior of the spiral heating tube (3).

5. The high-efficiency heat exchange pipeline of the sleeve-type spiral flow channel electromagnetic heater according to claim 4 is characterized in that: The spiral angles of the annular spiral outer tube (2), the spiral heating tube (3), the spiral guide strip (6) and the spiral insert (7) are the same.

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