Sulfur heat storage unit, sulfur heat storage module and sulfur heat storage device

Abstract

The utility model discloses a sulfur heat storage unit, a sulfur heat storage module and a sulfur heat storage device. The sulfur heat storage unit comprises a tube box, a tube plate, a sulfur storage tube and an electric heater. The tube plate divides the interior of the tube box into a sulfur collecting area and a heat exchange area; the sulfur storage pipe is arranged in the heat exchange area of the pipe box, the bottom of the sulfur storage pipe is closed, and the top of the sulfur storage pipe is in butt joint with the pipe hole. A plurality of baffle plates are arranged in a heat exchange area of the tube box from top to bottom, so that a snakelike flow channel is formed in the heat exchange area, the sulfur storage tube penetrates through the baffle plates, and heat removal medium inlets / outlets are respectively formed in two ends, corresponding to the snakelike flow channel, of the side wall of the tube box; the sulfur storage pipe is filled with sulfur, and a heating part of the electric heater is arranged in the liquid storage pipe and is in contact with the sulfur. Sulfur is adopted as a heat storage medium, the problem that the sensible heat energy storage temperature fluctuation range is large is solved, latent heat / sensible heat composite heat storage is achieved, the highest temperature level of sulfur reaches 700 DEG C through control over the temperature and pressure in the heat storage module, and the energy storage density is improved.

Description

Technical Field

[0001] This utility model relates to the field of heat storage equipment technology, specifically to a sulfur heat storage unit, a sulfur heat storage module, and a sulfur heat storage device. Background Technology

[0002] Thermal energy storage technology, as an important form of energy storage technology, plays a crucial role in fields such as concentrated solar power (CSP), off-peak electricity thermal energy storage, and waste heat recovery. Based on different storage principles, it can be divided into three types: sensible heat energy storage, latent heat energy storage, and thermochemical energy storage.

[0003] Latent heat energy storage: Latent heat energy storage is the storage and release of energy by absorbing and releasing energy through a phase change in the energy storage medium. The huge changes in various physical properties of the material during the phase change process make its practical application in engineering very difficult.

[0004] Thermochemical energy storage: Thermochemical energy storage is mainly based on a reversible thermochemical reaction. It stores and releases energy through the heat absorption and release of the reversible reaction. Although thermochemical energy storage has a high heat storage density, it is not safe and the heat storage process is uncontrollable, which seriously affects its promotion and application.

[0005] Sensible heat storage: Sensible heat storage refers to the heat storage technology that utilizes the temperature changes of materials to store and release heat. Currently, in the field of large-scale high-temperature heat storage, the sensible heat of materials is generally used for heat storage. Widely used high-temperature heat storage methods such as molten salt, heat transfer oil, and concrete all utilize the sensible heat of materials to achieve the purpose of heat storage, as shown in reference 1.

[0006] Reference 1: Chinese patent document with publication number CN105423795A

[0007] Reference 1 describes a molten salt thermal storage device, including a molten salt thermal storage furnace, an oil storage tank, a plate heat exchanger, and an insulated water storage tank. The molten salt thermal storage furnace includes a furnace body and vertical pipes encapsulating molten salt, evenly distributed inside the furnace body in an equilateral triangle or regular hexagonal pattern. The outer walls of the vertical pipes are wrapped with electric heating tape. The furnace body is filled with heat-conducting oil as the heat exchange fluid. The oil storage tank is connected to the molten salt thermal storage furnace and is used to store the heat-conducting oil. The molten salt thermal storage furnace is connected to the plate heat exchanger, and the plate heat exchanger is connected to the insulated water storage tank. This molten salt thermal storage device uses molten salt as the heat storage medium, eliminating the need for flow and molten salt pumps. It has a simple structure and is less corrosive. Heat exchange is conducted using traditional high-temperature heat-conducting oil, resulting in lower costs. The vertical pipes encapsulating molten salt are arranged in a special way, ensuring uniform heating, higher efficiency, a reasonable structure, high efficiency and energy saving, environmental friendliness and stability, and safety and reliability.

[0008] However, sensible heat storage also faces some problems in its application. For example, the commonly used heat storage materials have low energy density, large heat loss, and large fluctuations in output temperature. Utility Model Content

[0009] The purpose of this invention is to solve the above-mentioned technical problems existing in the prior art and to provide a sulfur thermal storage unit, a sulfur thermal storage module, and a sulfur thermal storage device. By using sulfur as the thermal storage medium, it not only solves the problem of large temperature fluctuations in sensible heat storage, but also realizes the composite thermal storage of latent heat and sensible heat. By controlling the temperature and pressure within the thermal storage module, the maximum temperature of sulfur can reach 700℃, thereby improving the energy storage density.

[0010] To address the shortcomings of the aforementioned technical problems, the present invention adopts the following technical solution: a sulfur thermal storage unit, comprising a tube box, a tube sheet, a sulfur storage tube, and an electric heater.

[0011] The tube sheet divides the interior of the tube box into an upper sulfur collection zone and a lower heat exchange zone, and multiple tube holes are evenly distributed on the tube sheet.

[0012] The sulfur storage pipe is placed in the heat exchange area of ​​the pipe box. Each pipe hole is equipped with a corresponding sulfur storage pipe. The bottom of the sulfur storage pipe is closed and its top is connected to the pipe hole, so that the inside of the sulfur storage pipe is connected to the sulfur collection area.

[0013] The heat exchange zone of the tube box is provided with several baffles from top to bottom, forming a serpentine flow channel in the heat exchange zone. The sulfur storage tube passes through the baffles, and the side wall of the tube box is provided with heat exchange medium inlet / outlet at both ends of the serpentine flow channel.

[0014] The sulfur storage pipe is filled with sulfur as a heat storage material, and the heating part of the electric heater is placed inside the storage pipe and in contact with the sulfur.

[0015] As a further optimization of the sulfur heat storage unit of this utility model, a limiting component to prevent the sulfur storage pipe from swinging is also provided inside the pipe box.

[0016] As a further optimization of the sulfur heat storage unit of this utility model: the heat exchange zone of the tube box is divided into multiple heat exchange areas by vertical partitions, each heat exchange area is provided with a baffle, the flow channels of multiple heat exchange areas are connected in series, and the two ends of the tube box corresponding to the flow channels are respectively provided with medium inlet / outlet.

[0017] As a further optimization of the sulfur heat storage unit of this utility model: the heat exchange zone of the tube box is divided into four heat exchange areas by a cross partition, and each heat exchange area is provided with a baffle plate. The flow channels of the four heat exchange areas are connected in series, and the two ends of the tube box corresponding to the flow channels are respectively provided with medium inlet / outlet.

[0018] As a further optimization of the sulfur heat storage unit of this utility model: heat transfer fins are provided on the outer wall of the sulfur storage pipe.

[0019] As a further optimization of the sulfur heat storage unit of this utility model: the pipe cover of the pipe box is equipped with a pressure gauge for monitoring the pressure of the sulfur collection area.

[0020] As a further optimization of the sulfur heat storage unit of this utility model: the electric heater is an electric heating rod, the lower end of which passes through the pipe cover of the pipe box and is placed inside the sulfur storage pipe.

[0021] This utility model also provides a sulfur thermal storage module, which includes multiple sulfur thermal storage units as described above, and the multiple sulfur thermal storage units are connected in parallel or in series.

[0022] This utility model also provides a sulfur heat storage device, including a heat exchanger and a sulfur heat storage module. The sulfur heat storage module includes multiple sulfur heat storage units connected in parallel. The heat exchanger has a heat release medium inlet and a heat release medium outlet. The heat release medium outlet of the heat exchanger is connected to a circulation pump through a pipeline. The output pipeline of the circulation pump is connected to the heat extraction medium inlets of multiple sulfur heat storage units through branch pipes. The heat extraction medium outlets of multiple sulfur heat storage units are collected and connected to the heat extraction medium inlet of the heat exchanger through branch pipes.

[0023] As a further optimization of the sulfur heat storage device of this utility model: each heat extraction medium inlet branch pipe of the tube box is equipped with a regulating valve, and each heat extraction medium outlet branch pipe of the tube box is equipped with a temperature detection element.

[0024] This utility model has the following beneficial effects:

[0025] 1. The heat storage device of this utility model uses sulfur as the heat storage medium. Sulfur has a high temperature (500-700℃), is cheaper than molten salt, has a higher heat transfer coefficient than solid heat storage, and has a higher heat storage capacity per unit volume.

[0026] 2. The heat storage device of this utility model features a modular design, with each individual heat storage module being smaller and having a stronger pressure-bearing capacity. The modules can be freely combined in parallel or series, and can be expanded in the future. The modular design, combined with temperature control, ensures stable heat output. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the internal structure of the heat storage unit of this utility model;

[0028] Figure 2 This is a schematic diagram of the structure of the heat storage unit (with cross-shaped partition) of this utility model;

[0029] Figure 3 This is a schematic diagram of the heat storage device of this utility model;

[0030] Marked in the image:

[0031] 1. Pipe box;

[0032] 2. Tube sheet;

[0033] 3. Sulfur storage pipe;

[0034] 4. Electric heater;

[0035] 5. Sulfur sinking area;

[0036] 6. Heat exchange zone;

[0037] 7. Baffles;

[0038] 8. Limiting components;

[0039] 801, Guide Post;

[0040] 802, guide sleeve;

[0041] 9. Cross-shaped partition;

[0042] 10. Fins;

[0043] 11. Pressure gauge;

[0044] 12. Control valve;

[0045] 13. Temperature sensing element;

[0046] 14. Heat exchanger;

[0047] 15. Circulating pump. Detailed Implementation

[0048] To better understand this utility model, the following embodiments further illustrate the content of this utility model, but the content of this utility model is not limited to the following embodiments.

[0049] <Sulfur thermal storage unit>

[0050] like Figure 1 As shown, the sulfur thermal storage unit includes a tube box 1, a tube sheet 2, a sulfur storage tube 3, and an electric heater 4.

[0051] For the tube box 1, a square box structure is preferable. A square box has clearly defined edges and corners, making it easy to position with other equipment or foundation structures during assembly. In contrast, irregularly shaped heat storage units are more complex to position and may require more measurements and adjustments to ensure accurate installation. When multiple sulfur heat storage units need to be assembled together, the square shape allows them to be arranged closely. Because the sides of a square are straight, adjacent heat storage units can fit together, achieving a compact assembly layout. The advantages of a square box are obvious when it is necessary to expand the heat storage system and increase the number of heat storage units. In a planar layout, square heat storage units can be easily expanded in an array. Besides planar expansion, square boxes are also beneficial for three-dimensional expansion. Multiple square heat storage units can be stacked to construct multi-layer heat storage systems. Furthermore, during expansion, square heat storage units are easier to integrate with existing heat storage systems. Whether it's the piping system, control system, or support structure, a square box can better adapt to existing layouts and interface standards.

[0052] The tube sheet 2 is horizontally installed inside the tube box 1, dividing the interior of the tube box 1 into an upper sulfur collection zone 5 and a lower heat exchange zone 6. The size of the sulfur collection zone 5 and the heat exchange zone 6 can be adjusted by the position of the tube sheet 2. In this embodiment, the tube sheet 2 is positioned near the cover of the tube box 1, meaning that the heat exchange zone 6 is significantly larger than the sulfur collection zone 5. Multiple tube holes are evenly distributed on the tube sheet 2, and the tube sheet 2 is welded together with the tube box 1.

[0053] The sulfur storage pipe 3 is placed in the heat exchange zone 6 of the pipe box 1. Each pipe hole is equipped with a corresponding sulfur storage pipe 3. The bottom of the sulfur storage pipe 3 is closed, and its top is connected to the pipe hole, so that the inside of the sulfur storage pipe 3 is connected to the sulfur collection zone 5.

[0054] The sulfur storage pipe 3 is made of corrosion-resistant stainless steel. During heat transfer, according to the basic principles of heat conduction (the heat transfer rate is related to factors such as thermal conductivity, heat transfer area, and temperature difference), a higher thermal conductivity means that heat can be transferred more quickly and efficiently within the material and between the material and the external medium. This embodiment uses corrosion-resistant stainless steel, which has a higher thermal conductivity than the ceramic material in Reference 1. This allows heat to be conducted more smoothly through the pipe wall of the sulfur storage pipe 3 during heat storage and release, enabling more timely transfer of heat to where it is needed or absorption and storage of heat from the outside, thereby improving the overall heat transfer efficiency of the entire heat storage system.

[0055] The top opening of the sulfur storage pipe 3 is welded to the tube sheet 2. The inside of the tube box 1 is divided into two sealed chambers. The upper part of the tube sheet 2 and the inside of the sulfur storage pipe 3 are connected to form one sealed chamber, and the lower part of the tube sheet 2 forms another sealed chamber. Through the design of the sulfur collection zone 5, each sulfur storage pipe 3 is connected through the sulfur collection zone 5. The tube box 1 has a reserved gas phase space, which can effectively control the pressure inside the sulfur storage pipe 3 and prevent the sulfur storage pipe 3 from rupturing due to the volume expansion of the liquid when heated. The tube cover of the tube box 1 is equipped with a pressure gauge 11 to monitor the pressure of the sulfur collection zone 5 in real time.

[0056] The sulfur storage pipe 3 is filled with sulfur as a heat storage material, and the heating part of the electric heater 4 is placed inside the liquid storage pipe and in contact with the sulfur as a heat storage material. In this embodiment, the electric heater 4 is specifically an electric heating rod. The lower end of the electric heating rod passes through the pipe cover of the pipe box 1 and is placed inside the sulfur storage pipe 3. Since the electric heating rod is immersed in liquid sulfur and is in direct contact with the heating medium, it has higher thermal efficiency.

[0057] Sulfur is not a conventional heat storage material, and there are currently no engineering examples of using sulfur as a heat storage material. Molten salt has been widely used as a heat storage medium. Molten salt has a low viscosity, and large-scale molten salt thermal storage systems use molten salt pumps to circulate the molten salt between cold and hot tanks, with forced convection heat transfer through heat exchangers.

[0058] The characteristics of sulfur as a heat storage material are: (1) Lower heat storage medium cost: The specific heat capacity of molten sulfur is about 20% lower than that of molten salt (solar salt, ternary salt), and the density is about 10% lower. As a heat storage medium, liquid sulfur is disadvantageous, but considering that the commercial price of liquid sulfur is only 1 / 5 of that of molten salt, these disadvantages can be compensated. (2) Higher operating temperature range: As a heat transfer / storage medium, liquid sulfur has a wider operating temperature range. The melting point of sulfur is 114℃, and the saturated vapor pressure at 700℃ is about 1.7MPa. Considering the pressure conditions, liquid sulfur can store heat in liquid form in the range of 120-700℃. Even in normal pressure environment, molten sulfur has an operating temperature range of 130℃ to 430℃. The most mature solar salt and ternary nitrate are currently used in engineering at operating temperature ranges of 290-565℃ and 150℃-400℃, respectively.

[0059] Liquid sulfur has high viscosity and poor fluidity in the mid-temperature range (160-300℃), making it unsuitable as a heat transfer medium. However, the sulfur in this patent is stored in the sulfur storage pipe 3. During heat release, the sulfur is in a natural convection state (and undergoes a phase change if applied to low-temperature areas below 130℃), eliminating the need to consider the fluidity of the liquid sulfur (avoiding the problem of poor fluidity of liquid sulfur in specific temperature ranges). While natural convection heat transfer efficiency is lower than forced convection heat transfer, this patent can enhance heat transfer by increasing the heat transfer area, optimizing the flow channel design, and reducing flow "dead zones."

[0060] Specifically, several baffles 7 are arranged from top to bottom in the heat exchange zone 6 of the tube box 1, forming a serpentine flow channel in the heat exchange zone 6. The sulfur storage pipe 3 is installed through the baffles 7, and the heat extraction medium inlet / outlet is respectively provided on the side wall of the tube box 1 at both ends of the serpentine flow channel.

[0061] When the medium flows inside the tube box 1, its originally straight flow direction is guided by the baffle 7 to change direction and form a serpentine flow channel in the heat exchange zone 6. This flow channel significantly extends the residence time and flow path of the medium in the heat exchange zone 6, enabling more thorough and efficient heat exchange between the medium and the wall of the sulfur storage tube 3 in the heat exchange zone 6, thereby improving the heat exchange efficiency.

[0062] During the heat storage process, to minimize heat loss, insulation measures are typically employed on the tube box 1, such as installing an insulation layer. This insulation layer can be made of glass wool, which is produced by melting glass and then fiberizing it. Its fibers are very fine and contain numerous tiny pores, which effectively prevent heat transfer.

[0063] The outer wall of the sulfur storage tube 3 is equipped with fins 10. By incorporating fins on the heat exchange tube, the heat exchange area is significantly increased. Simultaneously, the fins can disrupt the fluid boundary layer. During heat exchange, when a fluid (liquid or gas) flows across the surface of the sulfur storage tube 3, a boundary layer forms near the tube wall. The fluid velocity within this boundary layer is low, hindering heat exchange. The presence of fins creates turbulence as the fluid flows through them. For example, when a gaseous medium flows across the fins, the shape and arrangement of the fins alter the airflow path, creating vortices and turbulence within the channels between the fins. This turbulent flow effectively reduces the thickness of the boundary layer, allowing the core portion of the fluid (the higher-velocity portion) to approach the heat exchange surface more closely, thereby improving the convective heat transfer coefficient.

[0064] A limiting component 8 is provided at the bottom of the sulfur storage pipe 3. The limiting component 8 includes a guide sleeve 802 and a guide post 801. The guide sleeve 802 and the guide post 801 are respectively fixed to the bottom of the pipe box 1 and the sulfur storage pipe 3. The lower end of the guide post 801 is inserted into the guide sleeve 802. The function of the limiting component 8 is to prevent the sulfur storage pipe from swaying in the flow field. The lower end of the sulfur storage pipe 3 needs to be fixed. Since the length of the sulfur storage pipe 3 will increase after thermal expansion, if it is completely fixed, the thermal expansion will "break" the outer shell of the pipe box. The limiting component 8 restricts the lateral displacement of the sulfur storage pipe 3 and releases the axial displacement, which not only prevents the pipe from vibrating, but also absorbs the axial expansion of the sulfur storage pipe.

[0065] Of course, the structure of the limiting component 8 is not limited to the above structure. For example, the limiting component 8 may only include a limiting cylinder, which is fixed to the bottom of the pipe box 1. The lower end of the sulfur storage pipe 3 is directly inserted into the limiting cylinder. In the initial state, there is a gap between the sulfur storage pipe 3 and the bottom of the limiting cylinder.

[0066] like Figure 2 As shown, the heat exchange zone 6 of the tube box 1 is divided into four heat exchange zones 6 by a cross baffle 9. Each heat exchange zone 6 is equipped with a baffle 7. The flow channels of the four heat exchange zones 6 are connected in series. The tube box 1 is provided with a medium inlet / outlet at both ends of the corresponding flow channels.

[0067] The flow channels of the four heat exchange zones are connected in series to form a complete and continuous fluid pathway. The fluid can flow through each heat exchange zone in sequence, further extending the residence time and flow path of the medium in heat exchange zone 6, thereby improving heat exchange efficiency.

[0068] <Sulfur thermal storage device>

[0069] like Figure 3 As shown: The sulfur thermal storage device includes a heat exchanger 14 and a sulfur thermal storage module. The sulfur thermal storage module includes two sulfur thermal storage units connected in parallel.

[0070] The heat exchanger 14 has a heat release medium inlet and a heat release medium outlet. The heat release medium outlet of the heat exchanger 14 is connected to the circulation pump 15 through a pipeline. The output pipeline of the circulation pump 15 is connected to the heat extraction medium inlet of multiple sulfur heat storage units through branch pipes. The heat extraction medium outlets of multiple sulfur heat storage units are connected to the heat extraction medium inlet of the heat exchanger 14 through branch pipes.

[0071] Each heat exchange medium inlet branch pipe of the pipe box 1 is equipped with a regulating valve 12, and each heat exchange medium outlet branch pipe of the pipe box 1 is equipped with a temperature detection element 13.

[0072] The sulfur thermal storage device's overall structural design mainly comprises two key components: a heat exchanger 14 and a sulfur thermal storage module. The sulfur thermal storage module contains two sulfur thermal storage units connected in parallel. This parallel structure offers several advantages. Firstly, it increases the overall heat extraction or storage capacity of the sulfur thermal storage module, making the system more adaptable to different heat demands or supply scenarios. Secondly, if one sulfur thermal storage unit fails or requires maintenance, the other unit can still operate normally, ensuring the reliability and stability of the entire sulfur thermal storage device and preventing system failure due to a problem with a single unit.

[0073] The heat exchanger 14 has two key fluid interfaces: a heat release medium inlet and a heat release medium outlet. From the perspective of the medium flow path, the heat release medium outlet of the heat exchanger 14 is connected to the circulating pump 15 via a specially laid pipeline. The circulating pump 15, as the power source of the entire fluid circulation system, has its output pipeline connected to the heat extraction medium inlets of multiple sulfur thermal storage units via a series of branch pipes. This connection method ensures that the circulating pump 15 can deliver fluid at appropriate pressure and flow rate to each sulfur thermal storage unit to extract heat from it. The heat extraction medium outlets of multiple sulfur thermal storage units are then converged through corresponding branch pipes, ultimately connecting to the heat extraction medium inlet of the heat exchanger 14, thus forming a complete and closed heat extraction medium circulation loop. In this loop, after exchanging heat with other media in the heat exchanger 14, the fluid is driven by the circulating pump 15 to enter the sulfur thermal storage unit for heat extraction, and then returns to the heat exchanger 14, repeating this cycle repeatedly. This achieves efficient heat transfer and utilization, meeting the heat exchange function requirements of the entire sulfur thermal storage device.

[0074] Meanwhile, regulating valves 12 are installed on the inlet branch pipe of the heat exchange medium in the tube box 1. These regulating valves 12 can flexibly and precisely control the flow rate of the heat exchange medium entering the tube box 1 according to the actual operating conditions and needs. For example, when the temperature of the sulfur heat storage unit is too high or too low, the flow rate of the heat exchange medium can be adjusted by adjusting the opening of the regulating valve 12, thereby controlling the heat exchange rate and enabling the sulfur heat storage unit to operate stably within a suitable temperature range, avoiding various problems caused by excessively fast or slow heat exchange. At the same time, temperature detection elements 13 are installed on the outlet branch pipe of the heat exchange medium in the tube box 1. These temperature detection elements 13 can monitor the temperature information of the heat exchange medium flowing out of the tube box 1 in real time and accurately, and transmit this data to the relevant control system. Based on this temperature data, the operator or control system can understand the operating status of the sulfur heat storage unit in a timely manner, so as to make corresponding decisions, such as adjusting the speed of the circulating pump 15 and the opening of the regulating valve 12, thereby ensuring that the entire sulfur heat storage device is always in a state of high efficiency, safety and stability.

[0075] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the substantive content of this utility model.

Claims

1. A sulfur regenerative thermal unit characterized by: The sulfur storage unit comprises a tube box (1), a tube plate (2), a sulfur storage tube (3) and an electric heater (4). The tube plate (2) divides the tube box (1) into an upper sulfur collecting area (5) and a lower heat exchanging area (6), and a plurality of tube holes are uniformly distributed on the tube plate (2). The sulfur storage tube (3) is arranged in the heat exchanging area (6) of the tube box (1), and one sulfur storage tube (3) is arranged in each tube hole. The bottom of the sulfur storage tube (3) is closed, and the top of the sulfur storage tube (3) is connected with the tube hole, so that the inside of the sulfur storage tube (3) is communicated with the sulfur collecting area (5). A plurality of baffles (7) are arranged in the heat exchanging area (6) of the tube box (1) from top to bottom, so that a serpentine flow channel is formed in the heat exchanging area (6), the sulfur storage tube (3) passes through the baffles (7), and the side wall of the tube box (1) is provided with a heat medium inlet / outlet corresponding to the two ends of the serpentine flow channel.

2. A sulphur regenerative thermal unit as claimed in claim 1 characterised in that: The inside of the sulfur storage tube (3) is filled with heat storage material sulfur, and the heating part of the electric heater (4) is arranged in the sulfur storage tube and contacts the heat storage material sulfur.

3. The sulfur regenerative thermal unit of claim 1, wherein: The tube box (1) is further provided with a limiting component for preventing the sulfur storage tube (3) from swinging.

4. A sulphur regenerative thermal unit as claimed in claim 3 characterised by: The heat exchanging area (6) of the tube box (1) is divided into a plurality of heat exchanging area (6) domains by vertical partitions, a baffle (7) is arranged in each heat exchanging area (6) domain, the flow channels of the plurality of heat exchanging area (6) domains are connected in series, and the tube box (1) is provided with a medium inlet / outlet corresponding to the two ends of the flow channels.

5. The sulfur regenerative thermal unit of claim 1, wherein: The heat exchanging area (6) of the tube box (1) is divided into four heat exchanging area (6) domains by cross partitions (9), a baffle (7) is arranged in each heat exchanging area (6) domain, the flow channels of the four heat exchanging area (6) domains are connected in series, and the tube box (1) is provided with a medium inlet / outlet corresponding to the two ends of the flow channels.

6. The sulfur regenerative thermal unit of claim 1, wherein: Fins (10) are arranged on the outer wall of the sulfur storage tube (3).

7. The sulfur regenerative thermal unit of claim 1, wherein: A pressure gauge (11) for monitoring the pressure of the sulfur collecting area (5) is arranged on the cover of the tube box (1).

8. A sulfur regenerative module characterized by: The electric heater (4) is an electric heating rod, and the lower end of the electric heating rod passes through the cover of the tube box (1) and is arranged in the sulfur storage tube (3).

9. A sulfur regenerative device characterized by: The sulfur storage unit comprises a plurality of sulfur storage units according to any one of claims 1-7, and the plurality of sulfur storage units are connected in parallel or series.

10. The sulfur regenerative device of claim 9, wherein: The sulfur storage unit comprises a heat exchanger (14) and the sulfur storage module according to claim 8, the sulfur storage module comprises a plurality of sulfur storage units connected in parallel, the heat exchanger (14) has a heat releasing medium inlet and a heat releasing medium outlet, the heat releasing medium outlet of the heat exchanger (14) is connected with a circulating pump (15) through a pipeline, the output pipeline of the circulating pump (15) is connected with the heat medium inlets of the plurality of sulfur storage units through branch pipelines, and the heat medium outlets of the plurality of sulfur storage units are connected with the heat medium inlet of the heat exchanger (14) through a branch pipeline. Adjusting valves (12) are arranged on the heat medium inlet branch pipelines of the tube box (1), and temperature detecting elements (13) are arranged on the heat medium outlet branch pipelines of the tube box (1).

Images