A hydrogen dryer and a heater thereof

Abstract

The utility model provides a kind of heater of hydrogen dryer, including junction box, heating wire, shell, support and temperature measuring mechanism.The both ends of heating tube are connected with external power supply using junction box, and the middle section of heating tube is wound on support, and heating element is formed in spiral arrangement.On one hand, insulating material layer and shell are successively sleeved on the outside of heating wire, to prevent the insulation performance from being reduced due to dampness, on the other hand, by setting temperature measuring mechanism, the heating temperature of heating element can be monitored in real time, to prevent high temperature from damaging drying agent.The above setting can effectively improve insulation performance and prolong service life.The utility model provides a kind of hydrogen dryer containing the above heater.

Description

Technical Field

[0001] This utility model belongs to the field of hydrogen drying technology, and specifically relates to a hydrogen dryer and its heater. Background Technology

[0002] In modern nuclear power plants, the generator hydrogen supply system (GRV) is crucial for ensuring the efficient and reliable operation of turbine generator sets. Its core task is to provide dry, safe, and stable hydrogen to the generator for cooling the stator core and rotor. Hydrogen, as a highly efficient cooling medium, significantly improves the generator's operating efficiency and safety. The hydrogen must first be dehumidified by passing it through a hydrogen dryer tower. The activated alumina desiccant filling the tower adsorbs moisture from the hydrogen. During normal operation, the activated alumina absorbs moisture and can be regenerated by heating to remove the moisture.

[0003] Typically, generator hydrogen supply systems (GRVs) are equipped with dual-tower hydrogen dryers to ensure continuous and stable system operation. During normal operation, the two drying towers operate simultaneously, with one adsorbing moisture and the other regenerating. After the adsorption cycle ends, the two towers automatically switch operating states.

[0004] The hydrogen dryer mainly consists of a heater and a built-in circulating fan, which allows the hydrogen in the generator to continuously flow through the absorption layer containing adsorbent, removing water vapor and ensuring the dryness of the hydrogen.

[0005] However, current hydrogen dryers have revealed numerous problems in practical applications. At multiple nuclear power plants, hydrogen leaks frequently occur at the flange terminal seals of the heaters in the GRV system. Hydrogen is flammable and explosive, and leaks can easily trigger hydrogen explosions, threatening equipment and personnel safety. Heater components are prone to damage during operation, losing their heating function, affecting hydrogen drying efficiency, and even triggering chain reactions that disrupt the stable operation of the generator set. Furthermore, the heater's insulation material easily absorbs moisture, leading to insulation failure. During operation, this can cause discharges to the metal tower, damaging equipment and even causing fires, explosions, and other safety accidents.

[0006] Existing hydrogen dryers generally use bare alloy heating wires as the heat source, paired with synthetic stone or mica sheets as the insulation material support. During operation, a large amount of moisture remains trapped inside the drying tower and desiccant. After being absorbed by the synthetic stone or mica sheets, the insulation performance of the insulating materials significantly decreases. Furthermore, the alloy heating wires are prone to discharge through the metal tower when energized, posing a serious safety hazard. The original heater's power cord penetration used PTFE sealing rings as the sealing material, but the sealing effect was poor, frequently resulting in hydrogen leaks, wasting resources, increasing the risk of explosion, and threatening the safe operation of the power plant.

[0007] Given the numerous problems with existing heaters, there is an urgent need for a new type of heater for hydrogen dryers, which is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0008] The purpose of this invention is to provide a hydrogen dryer and its heater, which can effectively improve insulation performance and extend service life.

[0009] To solve the above-mentioned technical problems, this utility model provides a heater for a hydrogen dryer, including: a junction box, a heating wire, a housing, a bracket, and a temperature measuring mechanism;

[0010] The outer shell is fitted over the outside of the heating wire, and an insulating material layer is filled between the outer shell and the heating wire. The outer shell, the insulating material layer, and the heating wire constitute a heating tube.

[0011] The two ends of the heating tube are respectively connected to the junction box, and the middle section of the heating tube is wound around the bracket to form a spirally arranged heating element;

[0012] The temperature measuring mechanism is used to monitor the heating temperature of the heating wire in real time.

[0013] Optionally, in the above-mentioned hydrogen dryer and its heater, the temperature measuring mechanism includes a first temperature measuring mechanism and / or a second temperature measuring mechanism;

[0014] The measuring end of the first temperature measuring mechanism extends into the interior of the heating element, and the measuring end of the second temperature measuring mechanism extends between the outer shell and the heating wire.

[0015] Optionally, in the above-mentioned hydrogen dryer and its heater, the support includes multiple support plate groups arranged radially with the same axis as the center. Each support plate group includes multiple support plate units arranged at intervals in the radial direction and connecting rods connecting the multiple support plate units. Each support plate unit has multiple mounting grooves along the height direction.

[0016] Optionally, the above-mentioned hydrogen dryer and its heater further include a sealing flange, which is sealed to the open end of the drying tower of the hydrogen dryer, and the junction box is installed on the sealing flange.

[0017] Optionally, in the above-mentioned hydrogen dryer and its heater, the temperature measuring mechanism is a thermocouple, with one end of the thermocouple extending into the cavity of the heating element and the other end penetrating through the sealing flange.

[0018] Optionally, in the above-mentioned hydrogen dryer and its heater, a T-shaped hole is provided on the sealing flange, and the large-diameter end of the T-shaped hole is provided with an internal thread;

[0019] It also includes a sealing assembly connected to the large-diameter end. The sealing assembly includes a locking member and a sealing clamp. Both the locking member and the sealing clamp are made of metal and both have mounting holes for passing through the heating tube. The outer periphery of the locking member has an external thread that mates with the internal thread, and the bottom has an inclined surface for pressing into the sealing clamp. The inner diameter of the sealing clamp is smaller than the outer diameter of the bottom end of the locking member, and the outer diameter of the end face of the sealing clamp is larger than the inner diameter of the small-diameter end of the T-hole.

[0020] As the locking member is screwed into the large-diameter end, the locking member and the sealing clamp are squeezed together. The sealing clamp compresses and deforms the bottom end of the locking member inward, so that the heating tube is tightly connected to the locking member.

[0021] Optionally, in the above-mentioned hydrogen dryer and its heater, the outer shell is made of a metal material;

[0022] And / or, the insulating material layer is made of mineral insulating material;

[0023] And / or, the bracket is made of stainless steel;

[0024] And / or, the junction box is made of stainless steel, cast iron or aluminum alloy.

[0025] Optionally, in the above-mentioned hydrogen dryer and its heater, the outer side of the outer shell is also covered with an insulating sheath.

[0026] This utility model also provides a hydrogen dryer, including a drying tower and a heater, wherein the heater is disposed inside the drying tower and the heater is as described above.

[0027] Optionally, the hydrogen dryer described above also includes a built-in circulating fan, which is disposed in the drying tower.

[0028] This utility model provides a heater for a hydrogen dryer, which has the following advantages:

[0029] One end of the heating element is connected to an external power source via a junction box, while the other end is wound around a support, forming a spirally arranged heating element. On one hand, an insulating material layer and a shell are sequentially fitted around the heating wire to prevent the insulation layer from deteriorating due to moisture. On the other hand, a temperature measuring mechanism is installed inside the heating element to monitor its heating temperature in real time, preventing high temperatures from damaging the desiccant. These features effectively improve insulation performance and extend service life.

[0030] This invention provides a hydrogen dryer including the aforementioned heater, which has the same beneficial effects, and will not be described in detail here. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0032] Figure 1 A schematic diagram of the structure of a hydrogen dryer provided in an embodiment of this utility model;

[0033] Figure 2 A schematic diagram of the heater provided in an embodiment of this utility model;

[0034] Figure 3 A front view of the heater provided in an embodiment of this utility model;

[0035] Figure 4 A partially enlarged view of the wiring terminal provided in an embodiment of this utility model;

[0036] Figure 5 This is a schematic diagram of the sealing assembly provided in an embodiment of the present invention.

[0037] In the image above:

[0038] 100 - Heater;

[0039] 110-Sealing flange; 120-Junction box; 130-Heating wire; 140-Housing shell; 150-Bracket; 160-First temperature measuring mechanism; 170-Insulating sleeve; 180-Sealing assembly; 190-Second temperature measuring mechanism;

[0040] 200-Drying Tower;

[0041] 300- Built-in circulating fan. Detailed Implementation

[0042] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0043] The core of this invention is to provide a hydrogen dryer and its heater, which can effectively improve insulation performance and extend service life.

[0044] To enable those skilled in the art to better understand the technical solutions provided by this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] For details, please refer to Figures 1-5 The present invention provides a heater for a hydrogen dryer, comprising: a junction box 120, a heating wire 130, a housing 140, a bracket 150, and a temperature measuring mechanism.

[0046] The outer casing 140 is fitted over the heating wire 130, and an insulating material layer is filled between the outer casing 140 and the heating wire 130. The outer casing 140, the insulating material layer, and the heating wire 130 constitute the heating tube. The heating wire 130, the insulating material layer, and the outer casing 140 are arranged sequentially from the inside out, which can effectively avoid the problem of insulation degradation caused by the heating tube coming into contact with the desiccant when the heater 100 is powered on, and eliminate the risk of hydrogen explosion.

[0047] Heating wires 130 at both ends of the heating element are connected to junction boxes 120. The junction boxes connect the heating wires 130 to external electrical wiring, enabling multiple functions such as on / off control, energy metering, protection, and monitoring of the heating wires 130. The heating wires 130 generate heat when the junction box 120 is energized. The middle section of the heating element is wound around a bracket 150, forming a spirally arranged heating element, resembling a coil. The bracket 150 provides support for the middle section of the heating element.

[0048] The temperature measuring mechanism is used to monitor the heating temperature of the heating wire 130 in real time. In particular, the heating tubes are arranged in a spiral on the support 150. The spiral spacing of the heating tubes is strictly controlled in the manufacturing process to ensure that the heating element formed by the heating tubes heats evenly. When the heating element is working, the surface working temperature difference of the heating element is less than 2°C.

[0049] This utility model provides a heater for a hydrogen dryer. The two ends of the heating element are connected to an external power source via a junction box 120, and the middle section of the heating element is wound around a support 150, forming a spirally arranged heating element. On one hand, an insulating material layer and a shell 140 are sequentially sleeved on the outside of the heating wire 130 to prevent the insulation performance of the insulating material layer from deteriorating due to moisture. On the other hand, a temperature measuring mechanism is provided to monitor the heating temperature of the heating element in real time, preventing high-temperature damage to the desiccant. These features effectively improve insulation performance and extend service life.

[0050] The temperature measuring mechanism includes a first temperature measuring mechanism 160 and / or a second temperature measuring mechanism 190.

[0051] In one configuration method, such as Figure 2 and Figure 3The first temperature measuring mechanism 160 shown has its measuring end extending into the interior of the heating element. This design is intended to more accurately measure the temperature of the desiccant in or around the heating element. When the measuring end of the first temperature measuring mechanism 160 extends into the interior space of the heating element, the temperature of the heating element and the desiccant can be measured in real time, preventing the desiccant from being overheated.

[0052] In another setting, such as Figure 4 The second temperature measuring mechanism 190 shown has its measuring end extending between the outer shell 140 and the heating wire 130. Compared to the first temperature measuring mechanism 160, the second temperature measuring mechanism 190 is closer to the heating wire 130 and can directly monitor the temperature of the middle area before the heat from the heating wire is transferred to the outer shell, thus sensing the temperature of the core area of ​​the heating element. In this case, the temperature measurement data can more directly reflect the working temperature state of the heating element itself, and it is necessary to know its internal temperature accurately in order to control the temperature precisely.

[0053] The temperature measuring mechanism can adopt one of the above-mentioned forms, or both of the above-mentioned settings. A "one-in-use, one-out-of-charge" approach can be used. When the temperature measuring mechanism in use malfunctions or fails to operate normally, the backup temperature measuring mechanism can be put into use immediately, ensuring the continuity of the temperature measurement process and preventing loss of control over the heating element temperature due to interruption, thereby avoiding potential safety accidents or product quality problems. Alternatively, two temperature measuring mechanisms can be used simultaneously, and the two temperature measuring mechanisms located in different positions can be mutually calibrated and compared. If there is a significant deviation between the two measured temperature values, potential problems in the temperature measuring system can be detected in time, and corresponding calibration or maintenance measures can be taken to ensure the accuracy of the temperature measurement.

[0054] To facilitate winding, the bracket 150 includes multiple support plate assemblies arranged radially around a common axis. Each support plate assembly includes multiple support plate units spaced apart in the radial direction and connecting rods that connect the multiple support plate units to form a unified support structure. Each support plate unit has multiple mounting slots along its height to better facilitate wire winding and fixing. The overall shape of the heating element and bracket 150 is as follows: Figure 2 As shown, it is in the shape of a polygonal rhomboid prism.

[0055] The aforementioned multiple support plate assemblies are arranged radially around a common axis. This radial arrangement allows the wire to be more evenly distributed around the support during winding, preventing the wire from concentrating in any one area, thus ensuring the neatness of the winding and the uniformity of stress on the wire during the winding process. Each support plate assembly contains multiple support plate units, which are arranged at intervals in the radial direction. This helps to prevent the heating wire from winding erratically from the inside out and from top to bottom.

[0056] This solution also includes a sealing flange 110, which is sealed to the open end of the drying tower 200 of the hydrogen dryer, and a junction box 120 is installed on the sealing flange 110.

[0057] In a specific embodiment, the temperature measuring mechanism described above can be a thermocouple, which uses the thermoelectric effect to measure temperature. One end of the thermocouple extends into the cavity of the heating element, and the heating element surrounds the outside of the thermocouple, making it less susceptible to damage. The other end of the thermocouple passes through the sealing flange 110 and is fixed by welding, allowing it to be connected to an external display element or control element. Of course, other temperature sensors, such as resistance thermometers, can also be used in the temperature measuring mechanism, and no further limitations are made here.

[0058] To further improve the connection sealing performance, the sealing flange 110 is provided with a special T-shaped hole, which includes a large-diameter end and a small-diameter end that are interconnected, forming a stepped surface between the large-diameter end and the small-diameter end. An internal thread is provided on the side of the large-diameter end of the T-shaped hole.

[0059] This solution also includes a sealing assembly 180 connected to the large-diameter end. The sealing assembly 180 includes a locking element and a sealing clamp, both made of metal. Metal materials possess high strength, high-temperature resistance, and corrosion resistance, enabling them to withstand certain pressure and temperature changes and ensuring reliable sealing. For example, brass, copper, or copper alloys possess structural strength and can undergo a certain degree of deformation. Both the locking element and the sealing clamp have mounting holes for the heating element to pass through. The locking element has external threads on its outer circumference that mate with the internal threads, and an inclined surface at its bottom for pressing the sealing clamp into place, facilitating smooth insertion of the sealing clamp into the bottom of the locking element during the extrusion process. The inner diameter of the sealing clamp is smaller than the outer diameter of the bottom end of the locking element, while the outer diameter of the sealing clamp's end face is larger than the inner diameter of the small-diameter end of the T-hole. This prevents the sealing clamp from completely entering the small-diameter end of the T-hole during extrusion, ensuring effective sealing of the heating element at the large-diameter end.

[0060] As the locking element is screwed into the larger diameter end, it is compressed against the sealing clamp. The sealing clamp compresses and deforms the bottom end of the locking element inward, ensuring a tight connection between the heating element and the locking element. Compared to existing technologies that use materials such as rubber that cannot withstand high-temperature and high-pressure conditions and sealing ring structures, this solution utilizes the elastic deformation of metal to achieve a seal, resulting in higher reliability and stability. This significantly extends the service life of the sealing assembly and prevents hydrogen leakage from causing production risks.

[0061] Specifically, such as Figure 5 As shown, a unique press-fit sealing assembly is designed to improve the sealing performance and service life of the sealing flange 110 and the heating element. Two T-holes are provided on the sealing flange 110. The inner wall of the larger diameter end of the T-hole has internal threads. The locking member in the sealing assembly 180 has a hexagonal flange at the head and external threads on the outer bottom that mate with the aforementioned internal threads. The bottom edge of the locking member has a trapezoidal chamfer. When the locking member is screwed into the larger diameter end of the T-hole, the locking member and the sealing clamp are compressed. Because the inner diameter of the sealing clamp is smaller than the outer diameter of the bottom end of the locking member, under the pressure, the sealing clamp will compress and deform the bottom end of the locking member inward. This deformation allows the bottom end of the locking member to fit tightly against the heating element, thereby achieving a tight connection between the heating element and the locking member, achieving a good sealing effect, and preventing gas or liquid from leaking from the gap between the heating element and the sealing flange.

[0062] The above-mentioned sealing method can improve the connection strength and withstand high temperature and pressure, with a maximum operating temperature exceeding 500℃, ensuring that hydrogen does not leak.

[0063] In a specific embodiment, the outer casing 140 is made of a metallic material (such as 304 / 316 stainless steel or copper alloy), and in particular, a high-temperature and corrosion-resistant metal tube can be used as the outer casing 140 to prevent damage to the internal functional layer during use and installation. The insulating material layer uses a mineral insulating material, effectively solving the problem of moisture absorption and reduced insulation caused by the use of synthetic stone or mica board as insulating material in the prior art. The outer casing 140, the insulating material layer, and the heating wire 130 constitute a metal-clad heating element.

[0064] The surface of the outer casing 140 is coated and sintered to form a protective coating, such as a coating made of silicone oil, epoxy coating, or polytetrafluoroethylene coating, which has the functions of corrosion resistance, high temperature resistance and insulation.

[0065] Specifically, mineral insulating materials can be boron nitrides. Boron nitride materials possess high thermal stability, chemical stability, and electrical insulation properties, as well as advantages such as high thermal conductivity, dielectric properties, and ease of processing. With a melting point as high as 2800℃, it is both a typical electrical insulator and an excellent thermal conductor.

[0066] The bracket 150 is made of stainless steel, ensuring both structural strength and stability. The junction box 120 is made of stainless steel, cast iron, or aluminum alloy, ensuring both structural strength and explosion-proof performance.

[0067] Based on the above specific embodiments, a high-temperature resistant insulating sheath 170 is also wrapped between the insulating material layer and the outer shell 140, which can further enhance the safety of the heater 100.

[0068] The heater 100 of the hydrogen dryer provided in this case has a fast heating speed, uniform heating, and small core-surface temperature difference, which can effectively improve the service life of the heater 100 and save maintenance labor costs.

[0069] Furthermore, this application also provides a hydrogen dryer, including a drying tower 200 and a heater 100, wherein the heater 100 is disposed within the drying tower 200, and the heater 100 is the heater described in the specific embodiment above. A sealing flange 110 can be connected to the open end of the drying tower 200.

[0070] Obviously, the hydrogen dryer with the heater 100 described above has the same beneficial effects, which will not be elaborated here.

[0071] This solution also includes a built-in circulating fan 300, which is installed in the drying tower 200. The operation of the built-in circulating fan 300 enables orderly airflow within the drying tower 200, accelerating the contact and exchange between the wet hydrogen and the desiccant, thereby improving drying efficiency.

[0072] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0073] In the description of this application, "multiple" means two or more. If "first" or "second" is mentioned, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0074] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0075] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more.

[0076] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0077] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0078] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A heater for a hydrogen dryer, characterized in that, include: Junction box (120), heating wire (130), housing (140), bracket (150) and temperature measuring mechanism; The outer shell (140) is sleeved on the outside of the heating wire (130), and an insulating material layer is filled between the outer shell (140) and the heating wire (130). The outer shell (140), the insulating material layer and the heating wire (130) constitute a heating tube. The two ends of the heating tube are respectively connected to the junction box (120), and the middle section of the heating tube is wound around the bracket (150) to form a spirally arranged heating element; The temperature measuring mechanism is used to monitor the heating temperature of the heating wire (130) in real time.

2. The heater of the hydrogen dryer according to claim 1, characterized in that, The temperature measuring mechanism includes a first temperature measuring mechanism (160) and / or a second temperature measuring mechanism (190). The measuring end of the first temperature measuring mechanism (160) extends into the interior of the heating element, and the measuring end of the second temperature measuring mechanism (190) extends between the outer shell (140) and the heating wire (130).

3. The heater of the hydrogen dryer according to claim 1, characterized in that, The bracket (150) includes multiple support plate groups arranged radially with the same axis as the center. Each support plate group includes multiple support plate units arranged at intervals in the radial direction and connecting rods connecting the multiple support plate units. Each support plate unit has multiple mounting slots along the height direction.

4. The heater of the hydrogen dryer according to claim 1, characterized in that, It also includes a sealing flange (110), which is sealed to the open end of the drying tower (200) of the hydrogen dryer, and the junction box (120) is installed on the sealing flange (110).

5. The heater of the hydrogen dryer according to claim 4, characterized in that, The temperature measuring mechanism is a thermocouple, with one end of the thermocouple extending into the cavity of the heating element and the other end passing through the sealing flange (110).

6. The heater of the hydrogen dryer according to claim 4, characterized in that, The sealing flange (110) has a T-shaped hole, and the large-diameter end of the T-shaped hole has an internal thread; It also includes a sealing assembly (180) connected to the large-diameter end. The sealing assembly (180) includes a locking member and a sealing clamp. Both the locking member and the sealing clamp are made of metal and both have mounting holes for passing through the heating tube. The outer periphery of the locking member has an external thread that mates with the internal thread, and the bottom has an inclined surface for pressing into the sealing clamp. The inner diameter of the sealing clamp is smaller than the outer diameter of the bottom end of the locking member, and the outer diameter of the end face of the sealing clamp is larger than the inner diameter of the small-diameter end of the T-hole. As the locking member is screwed into the large-diameter end, the locking member and the sealing clamp are squeezed together. The sealing clamp compresses and deforms the bottom end of the locking member inward, so that the heating tube is tightly connected to the locking member.

7. The heater of the hydrogen dryer according to claim 1, characterized in that, The outer casing (140) is made of metal. And / or, the insulating material layer is made of mineral insulating material; And / or, the bracket (150) is made of stainless steel; And / or, the junction box (120) is made of stainless steel, cast iron or aluminum alloy.

8. The heater of the hydrogen dryer according to claim 1, characterized in that, The outer side of the outer casing (140) is also covered with an insulating sheath (170).

9. A hydrogen dryer, characterized in that, It includes a drying tower (200) and a heater (100), the heater (100) being disposed within the drying tower (200), and the heater (100) being the heater as described in any one of claims 1-8.

10. The hydrogen dryer according to claim 9, characterized in that, It also includes a built-in circulating fan (300) disposed in the drying tower (200).

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