Novel electric heating device and method for industrial processing

Abstract

The invention provides a novel electric heating device and method for industrial processing, and relates to the technical field of industrial electric heating equipment, and the novel electric heating device comprises a heating pipeline, a resistance heating device, an induction heating and heat supplementing device, a heat storage medium layer, a shell, a heat preservation medium and the like. A heated object is conveyed in the heating pipeline; the resistance heating device and the induction heating and heat supplementing device cover the outer surface of a heating pipeline to heat an object to be heated in the pipeline; the heat storage medium layer is located on the inner layer or the outer layer of the heating device and used for conducting limited storage and even heat transfer on heat generated by the heating device. The shell is the outermost layer of the electric heating device and is covered with a heat preservation medium to reduce heat loss. The device is suitable for various industrial heat treatment processes such as aluminum processing, resistance heating and solid heat storage are combined, the efficiency of the industrial electric heating process is improved, and the multi-stage heating expansibility in the heating process is improved by adopting a pipeline type heating structure.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial electric heating equipment, and in particular to a novel electric heating device and method for industrial processing. Background Art

[0002] The heating process in industry has significant potential for energy conservation and emission reduction, especially in the heat treatment industry for metal materials, which has a huge demand for heat. With the general trend of green energy heating substitution, its electric heating technology still has room for further improvement. Existing methods for heat treatment of metal materials mostly use induction heating or fossil energy heating. Limited by the magnetic permeability of the heated object and the heat-generating medium, they often have problems such as low efficiency, heating temperature being limited by the Curie temperature, and difficulty in controlling temperature. Alternatively, the use of fossil energy for heating leads to large amounts of carbon emissions. Existing electric heating methods often have poor ability to cope with power fluctuations, making it difficult to directly adapt to the access of renewable energy sources. They are also prone to uneven heating effects and poor process compatibility. Summary of the Invention

[0003] To fill this technological gap, the present invention provides a novel electric heating device and method for industrial processing. This device utilizes resistance heating to improve heating efficiency and achieves flexible temperature control through segmented and graded heating. The device also incorporates solid heat storage during the heating process to achieve uniform heating of the pipeline. This partial storage of heat during the heating process mitigates the impact of power supply fluctuations on the heating process, ensuring a stable supply of heat energy.

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

[0005] A new type of electric heating device for industrial processing includes: an energy supply part, a shell and a thermal insulation medium, an electric heater, a heat storage medium, a heating pipe, and a transportation part for the heated object. The transportation part for the heated object is located in the heating pipe, the electric heater is tightly attached to the inner surface or outer surface of the heating pipe, the heat storage medium is located on the outer layer of the electric heating device and covers the electric heater, the shell and the thermal insulation medium serve as the outermost layer of the electric heating device, and the energy supply part supplies electrical energy to the electric heater.

[0006] A novel electric heating method for industrial processing, performed by the novel electric heating device for industrial processing, comprises the following steps:

[0007] Step S1: The energy supply unit supplies power to the electric heater disposed inside the heat storage medium metal body, and the electric heater selectively uses renewable energy power or grid power to heat the metal body;

[0008] Step S2: The heat storage medium metal body absorbs and stores part of the heat energy, evenly releases heat to the heating pipe, and ensures uniform and stable heat supply when the power supply fluctuates;

[0009] Step S3: The heated material to be heat-treated is transported into the heating pipe through the transport portion;

[0010] Step S4: The heated material passes through each heating stage in sequence, and the heating temperature and heating rate are adjusted by controlling the residence time of the material in each heating stage to gradually achieve the target heating requirements;

[0011] Step S5: According to the heating condition of the heated material, reasonably select and input the supplementary heating stage to perform supplementary heating to complete the heating process.

[0012] The present invention has the following beneficial technical effects:

[0013] The present invention solves the problems of low efficiency, limited heating temperature and difficult temperature control of traditional induction heating by combining pipeline resistance heating with induction heating in industrial heating technology.

[0014] The present invention utilizes multi-stage pipe heating, making it easier to control the temperature gradient during the heating process and improving the scalability of the heating process. The present invention has a wide range of applications and strong applicability, providing a renewable energy heating method for various industrial heating processes. Furthermore, it is easier to integrate with production processes and can meet a variety of different process requirements.

[0015] This invention leverages heat storage technology to address the uneven heating temperature problem associated with resistance heating and improve its heat transfer efficiency. Combining heat storage with heating technology, this invention enhances the ability of electric heating devices to directly access renewable energy through short-term heat storage. This effectively addresses power fluctuations, improves flexibility, and enhances stable heating capacity.

[0016] The present invention can make full use of renewable energy and provide a renewable energy electric heating access device for high-energy-consuming industries. It can effectively reduce carbon emissions in the industrial heating process, reduce general electricity consumption, and has significant economic value. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic cross-sectional view of a novel electric heating device for industrial processing according to the present invention;

[0018] Figure 2 This is a schematic diagram of the three-dimensional structure of the novel electric heating device for industrial processing according to the present invention;

[0019] Figure 3 It is a schematic cross-sectional view of a novel electric heating device for fluid heating;

[0020] Figure 4 It is a schematic diagram of the three-dimensional structure of a new electric heating device for fluid heating;

[0021] Figure 5 This is a layout diagram of an electric heating device of the present invention.

[0022] Figure numerals: 1. Heating pipe; 2-1. First heating stage; 2-2. Second heating stage; 2-3. Third heating stage; 2-4. Supplementary heating stage; 3. Outer heat storage medium; 4. Electric heater; 4-1. First electric heater; 4-2. Second electric heater; 4-3. Third electric heater; 5. Inner heat storage medium; 6. Energy supply part; 6-1. First energy supply part; 6-2. Second energy supply part; 6-3. Third energy supply part; 7. Transportation part of the heated object.

[0023] 8-1. Internal flow channel of fluid; 8-2. External flow channel of fluid; 9. Insulation medium; 10. Main pipeline of fluid heating device; 11. Casing of fluid heating device. DETAILED DESCRIPTION

[0024] The present invention is further explained below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This is a schematic cross-sectional view of a novel electric heating device for industrial processing according to the present invention. Figure 2 This is a schematic diagram of the three-dimensional structure of the new industrial processing electric heating device of the present invention. Figure 1 and Figure 2 As shown, the device comprises: an outer shell and thermal insulation medium, a heating pipe 1, an electric heater 4, an outer heat storage medium 3 and an inner heat storage medium 5, an energy supply unit 6, and a heated object transport unit 7. The heated object transport unit 7 is located within the heating pipe 1, the electric heater 4 is in close contact with the inner or outer surface of the heating pipe 4, the outer heat storage medium 3 is located on the outer layer of the electric heating device and covers the electric heater 4, the outer shell and thermal insulation medium serve as the outermost layer of the electric heating device, and the energy supply unit supplies electrical energy to the electric heater 4.

[0026] Reference below Figure 1 Describe the composition of the electric heating device when the application scenario is aluminum alloy processing. Figure 1As shown, the electric heating device in this device can be divided into three heating stages. Each stage consists of multiple groups of electric heaters 4 and an inner layer of heat storage medium 5. These groups are coated on the outer surface of the heating pipe 1 or attached to the inner surface of the heating pipe 1 and located within the outer layer of heat storage medium 3. These are the first heating stage 2-1, the second heating stage 2-2, the third heating stage 2-3, and the first supplementary heating stage 2-4. The number of heating stages is not limited to the four shown in the figure and can be expanded to more stages if necessary based on heating gradient requirements. The first heating stage 2-1 includes a first electric heater 4-1, a second electric heater 4-2, and a third electric heater 4-3. The second heating stage 2-2 and the third heating stage 2-3 also include three electric heaters. Preferably, the groups of electric heaters 4 are evenly distributed within the heating stage, but they can also be unevenly distributed depending on the heating temperature requirements. The number of heaters in each stage is not limited to the three groups shown in the figure and can be expanded to more groups based on production needs.

[0027] The heat storage medium may include an outer heat storage medium 3 and an inner heat storage medium 5. The outer shell and the heat preservation medium serve as the support and packaging part of the electric heating device, and the outer layer of the outer shell is covered with the heat preservation medium to reduce heat loss.

[0028] Preferably, the transport portion 7 of the heated object is a heat-treated aluminum alloy. The transport portion 7 is transported by a transport device into the heating pipe 1 for heating. The transport portion 7 can move from left to right, allowing for continuous production. The production temperature is controlled based on the heating time between the first heating stage 2-1, the second heating stage 2-2, and the third heating stage 2-3.

[0029] Preferably, the heating pipe 1 is a metal cylindrical pipe with good thermal conductivity. Depending on the specific processing technology, the heating pipe material can be other thermal conductive materials and the shape can also be other shapes.

[0030] The energy supply section 6 includes a first energy supply section 6-1, a second energy supply section 6-2, and a third energy supply section 6-3. The energy supply sections for the electric heaters in the first heating stage 2-1, the second heating stage 2-2, and the third heating stage 2-3 are the first energy supply section 6-1, the second energy supply section 6-2, and the third energy supply section 6-3, respectively. The first energy supply section 6-1 is connected to the first heating stage 2-1, the second energy supply section 6-2 is connected to the second heating stage 2-2, and so on, supplying electrical energy to each electric heater in each heating stage. The first energy supply section 6-1, the second energy supply section 6-2, and the third energy supply section 6-3 can be powered by conventional power grid electricity, or alternatively, by renewable energy sources when sufficient renewable energy is available. That is, the energy supply section's electricity comes from renewable energy sources such as photovoltaic power generation and wind power generation. Alternatively, it can be powered by a conventional power grid.

[0031] Preferably, the first electric heater 4-1, the second electric heater 4-2, and the third electric heater 4-3 are resistance heaters, such as electric heating tubes and heating wires, located within the inner heat storage medium 5 to heat the heating pipe 1. The electric heaters generate heat, converting electrical energy into thermal energy, which is then stored by the heat storage medium. The heating section utilizes a multi-stage heating system using a tiered and grouped approach. Each heating stage consists of multiple groups of heating tubes and heating wires, heating the object in a step-by-step manner. The final stage of the electric heating system is the supplemental heating stage.

[0032] Preferably, the heaters in supplemental heating stages 2-4 are induction heaters, arc heaters, or fossil energy heaters (such as natural gas). The heaters in these supplemental heating stages are selectively activated based on production needs. This selective activation of the supplemental heating system allows for precise control of the heating temperature.

[0033] Preferably, the heat storage medium is a metal body, which can be cast iron, stainless steel, or another metal or alloy. The metal body encases the electric heater 4 in the heating and supplemental heat sections. The electric heater 4 provides heat, partially storing the heat energy, evenly releasing it to the heating pipe 1 and supplying heat to the heated material. The number of heating stages and heaters in each stage within the heat storage medium is determined by power requirements. Each heater stage is evenly and symmetrically distributed within the heat storage medium to heat the medium.

[0034] Preferably, the outer heat storage medium 3 and the inner heat storage medium 5 can be different types of cast iron. They temporarily store energy from the first, second, and third electric heaters 4-1, 4-2, and 4-3, and heat the transport portion 7 (aluminum alloy heat-treated workpiece) of the heated object through energy exchange in the heating pipe 1. The required volume of cast iron is determined by the heat storage requirements. The inner heat storage medium 5 should be a material with good thermal conductivity, while the outer heat storage medium 3 should be a material with a higher specific heat capacity.

[0035] The transportation section 7 for the heated object can be an aluminum alloy heat treatment production line in the aluminum processing industry, or an industrial process requiring heat treatment in the chemical, textile, and pharmaceutical industries.

[0036] Furthermore, the object to be heated may also be a heating production line for gaseous media such as petroleum cracking, or a liquid heating production line in a solution treatment process.

[0037] like Figure 3 and Figure 4As shown, the novel electric heating device for industrial processing of the present invention can adopt the illustrated double-layer heating structure when used for fluids such as gas or liquid. In this device, the heating pipe 1 is the main pipe 10 of the fluid heating device, the outer shell and insulation medium are the fluid heating device outer shell 11 and the insulation medium 9 outside it, and the heat storage medium includes an outer heat storage medium 3 and an inner heat storage medium 5.

[0038] The fluid heating device's main conduit includes an internal fluid flow channel 8-1 and an external fluid flow channel 8-2. The heated fluid is initially heated in the internal fluid flow channel 8-1 before returning to the external fluid flow channel 8-2 for secondary heating. The internal fluid flow channel 8-1 is the flow channel area within the fluid heating device's main conduit 10, while the external fluid flow channel 8-2 is the flow channel area between the outer layer of the fluid heating device's main conduit 10 and the inner layer of the fluid heating device's outer shell 11.

[0039] Preferably, the fluid electric heating device adopts a multi-layer concentric cylindrical structure, the electric heater 4 is coated on the outer layer of the main pipeline of the fluid heating device or attached to the inner layer of the main pipeline, and the outer layer heat storage medium 3 and the inner layer heat storage medium 5 coat the electric heater 4 and are located on the outermost side of the main pipeline 10 of the fluid heating device.

[0040] The outer heat storage medium 3 stores the heat from the electric heater for a short time and heats the fluid medium in the internal fluid flow channel 8-1 and the external fluid flow channel 8-2. The inner heat storage medium 5 evenly transfers the heat from the electric heater to the main pipeline 10 of the fluid heating device and the outer heat storage medium 3.

[0041] The heat-insulating medium 9 is covered on the outside of the fluid heating device housing 11 to reduce heat loss during the heating process. The fluid heating device housing 11 serves as a support and packaging part of the electric heating device.

[0042] like Figure 5 As shown, the fluid electric heating device can adopt a single outer tube and multiple heating main pipes to obtain a better heating effect. The heated fluid first flows into the fluid inner flow channel 8-1 for heating, and then flows through the fluid outer flow channel 8-2 for secondary heating.

[0043] Preferably, the fluid heating device housing 11 may contain five heating and heat storage tubes, each comprising the fluid heating device main pipe 10, the electric heater 4, the outer heat storage medium 3, and the inner heat storage medium 5. These tubes are arranged symmetrically, two on top and two on the left and right, with one tube centered in the middle. The number and arrangement of the heating tubes are not limited to those shown in the figure; different numbers of heating tubes can be used to meet different heating requirements, allowing for a wider range of arrangement configurations.

[0044] A novel heating method for industrial processing is also provided. When cast iron is used as the heat storage medium and aluminum alloy solid is used as the heated material, the heating process includes the following steps:

[0045] Step S1: The energy supply part supplies power to the electric heater placed inside the heat storage medium cast iron, and the electric heater selectively uses renewable energy power or grid power to heat the cast iron.

[0046] Step S2: The heat storage medium cast iron absorbs and stores part of the heat energy, releases heat evenly to the heating pipe, and ensures uniform and stable heat supply when the power supply fluctuates.

[0047] Step S3: The heated material that needs to be heat-treated is transported into the heating pipe through the transport portion.

[0048] Step S4: The heated material passes through each heating stage in sequence, and the heating temperature and heating rate are adjusted by controlling its residence time in each heating stage to gradually achieve the target heating requirements.

[0049] Step S5: According to the heating condition of the heated material, reasonably select and input the supplementary heating stage to perform supplementary heating to complete the heating process.

[0050] When cast iron is used as the heat storage medium and gas or liquid is used as the heated material, the heating pipe can adopt a special double-layer structure. In addition to the above steps, the heating process also includes the following special steps:

[0051] Step S6: The heated material is first heated through the inner pipe and then heated again through the outer pipe to be heated evenly and fully.

[0052] Thus far, the technical route of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A new type of electric heating device for industrial processing, characterized in that: include: An energy supply portion (6), a housing and a heat-insulating medium, an electric heater, a heat storage medium, a heating pipe (1), and a transportation portion (7) for a heated object. The transportation portion for the heated object is located in the heating pipe (1), the electric heater is closely attached to the inner surface or outer surface of the heating pipe, the heat storage medium is located in the outer layer of the electric heating device and covers the electric heater, the housing and the heat-insulating medium serve as the outermost layer of the electric heating device, and the energy supply portion (6) supplies electric energy to the electric heater.

2. The novel electric heating device for industrial processing according to claim 1 is characterized in that: The electric heating device is divided into three heating stages, each of which is composed of multiple groups of electric heaters and an inner layer of heat storage medium (5), which are coated on the outer surface of the heating pipe (1) or attached to the inner surface of the heating pipe (1) and located inside the outer layer of heat storage medium (3), namely the first heating stage (2-1), the second heating stage (2-2) and the third heating stage (2-3), and the first heating stage (2-4); the first heating stage (2-1) includes a first electric heater (4-1), a second electric heater (4-2) and a third electric heater (4-3).

3. The novel electric heating device for industrial processing according to claim 2 is characterized in that: The heat storage medium comprises an outer layer heat storage medium (3) and an inner layer heat storage medium (5).

4. The novel electric heating device for industrial processing according to claim 2 is characterized in that: The shell and the heat-insulating medium serve as the supporting and packaging parts of the electric heating device, and the outer layer of the shell is covered with the heat-insulating medium.

5. The novel electric heating device for industrial processing according to claim 2 is characterized in that: The heating pipe (1) is a metal cylindrical pipe.

6. The novel electric heating device for industrial processing according to claim 2 is characterized in that: The energy supply part (6) includes a first energy supply part (6-1), a second energy supply part (6-2), and a third energy supply part (6-3), and the energy supply parts of the electric heaters in the first heating stage (2-1), the second heating stage (2-2), and the third heating stage (2-3) are the first energy supply part (6-1), the second energy supply part (6-2), and the third energy supply part (6-3), respectively.

7. The novel electric heating device for industrial processing according to claim 6 is characterized in that: The power of the first energy supply part (6-1), the second energy supply part (6-2) and the third energy supply part (6-3) comes from photovoltaic power generation, wind power generation, or is supplied by a conventional power grid.

8. The novel electric heating device for industrial processing according to claim 3 is characterized in that: The first electric heater (4-1), the second electric heater (4-2) and the third electric heater (4-3) are resistance heaters, which are located inside the inner heat storage medium (5) and heat the heating pipe (1); the heaters in the supplementary heating stage (2-4) are induction heaters, arc heaters, or fossil energy heaters.

9. The novel electric heating device for industrial processing according to claim 3 is characterized in that: When the application scenario is a fluid such as gas or liquid, the heating pipe is the main pipe (10) of the fluid heating device, the shell and the heat-insulating medium are the shell (11) of the fluid heating device and the heat-insulating medium (9) outside the shell (11), the heat-insulating medium (9) is covered on the outside of the shell (11) of the fluid heating device to reduce heat loss during the heating process, and the shell (11) of the fluid heating device serves as the support and packaging part of the electric heating device; the heat storage medium includes an outer heat storage medium (3) and an inner heat storage medium (5); the main pipe of the fluid heating device includes an internal fluid flow channel (8-1) and an external fluid flow channel (8-2), the heated fluid is first preliminarily heated in the internal fluid flow channel (8-1), and then returns to the external fluid flow channel (8-2) for secondary heating, the internal fluid flow channel (8-1) is the internal flow channel area of ​​the main pipe (10) of the fluid heating device, and the external fluid flow channel (8-2) is the flow channel area between the outer layer of the main pipe (10) of the fluid heating device and the inner layer of the shell (11) of the fluid heating device.

10. A novel electric heating method for industrial processing, characterized in that: The method is performed by the novel electric heating device for industrial processing according to any one of claims 1 to 9, comprising the following steps: Step S1: The energy supply unit supplies power to the electric heater disposed inside the heat storage medium metal body, and the electric heater selectively uses renewable energy power or grid power to heat the metal body; Step S2: The heat storage medium metal body absorbs and stores part of the heat energy, evenly releases heat to the heating pipe, and ensures uniform and stable heat supply when the power supply fluctuates; Step S3: The heated material to be heat-treated is transported into the heating pipe through the transport portion; Step S4: The heated material passes through each heating stage in sequence, and the heating temperature and heating rate are adjusted by controlling the residence time of the material in each heating stage to gradually achieve the target heating requirements; Step S5: According to the heating condition of the heated material, reasonably select and input the supplementary heating stage to perform supplementary heating to complete the heating process.

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