Fluid supercritical heating device

Abstract

This application provides a supercritical fluid heating device, comprising: a shell, a heating tube, an isolation tube, a heating assembly, and a heat insulation assembly; the heating tube and the isolation tube are disposed in a cavity, with the isolation tube sleeved outside the heating tube; the heating assembly is disposed around the isolation tube for heating the heating tube through the isolation tube; the heat insulation assembly is disposed between the shell and the heating assembly and covers the heating assembly. This application achieves uniform heating of the heating tube by placing an isolation tube between the heating assembly and the heating tube, allowing the heating assembly to transfer heat first to the isolation tube and then to the heating tube through the isolation tube. This results in high heating efficiency and reduces waste liquid generated during the heating process of the supercritical fluid. Furthermore, the supercritical heating device provided by this application places the heating assembly outside the heating tube, eliminating the need to consider the effects of high temperature, high pressure, and highly corrosive environments on the heating device. A general heating device can be used to heat the fluid, simplifying design and saving costs.

Description

Technical Field

[0001] This application relates to the field of supercritical heating, and more particularly to a fluid supercritical heating device. Background Technology

[0002] Supercritical fluids refer to fluids in a supercritical state, where the fluid's temperature and pressure reach or exceed its critical temperature and critical pressure, placing it in a state between liquid and gas and exhibiting unique physicochemical properties. For example, supercritical pure water has excellent solubility under high temperature and pressure, making it suitable for treating organic wastewater or for biomass conversion.

[0003] The preparation of supercritical pure water typically requires pressurization and heating. Traditional methods of heating pure water usually involve using heating devices such as electric heating rods or heat exchangers, which directly contact the water to be heated. However, ordinary electric heating rods or heat exchangers cannot operate stably under high temperature and pressure, requiring upgrades to their materials, which increases costs. Furthermore, ordinary electric heating rods or heat exchangers have long heating times and low heat transfer efficiency, resulting in a large amount of waste liquid during the preparation process, which is not conducive to cost savings and improving production efficiency. Utility Model Content

[0004] In view of this, the purpose of this application is to propose a supercritical fluid heating device that does not need to consider the influence of high temperature, high pressure and highly corrosive environment on the heating components, and can rapidly heat the fluid.

[0005] To achieve the above objectives, this application provides a supercritical fluid heating device, comprising:

[0006] The outer shell, which encloses a cavity;

[0007] A heating element is disposed within the cavity. One end of the heating element has an inlet for fluid to enter, and the other end has an outlet for fluid to flow out. The inlet and outlet of the heating element pass through the outer shell and extend to the outside of the outer shell.

[0008] An isolation tube is disposed within the cavity and sleeved outside the heating tube;

[0009] A heating assembly, which is disposed around the isolation tube and is used to heat the heating tube through the isolation tube;

[0010] A heat insulation component is disposed between the outer shell and the heating component, and covers the heating component.

[0011] Furthermore, the heat insulation component includes a first heat insulation component and a second heat insulation component; the first heat insulation component is disposed outside the heating component and completely encloses the heating component; the second heat insulation component is disposed between the first heat insulation component and the outer shell, and the heat insulation coefficient of the second heat insulation component is greater than that of the first heat insulation component.

[0012] Furthermore, the first thermal insulation component includes high-silica fiberglass tape;

[0013] And / or the second thermal insulation component includes aluminum silicate insulation cotton.

[0014] Furthermore, the heating tube includes a first heating tube and a second heating tube. The first heating tube is located above the second heating tube. One end of the first heating tube is the liquid inlet. The other end of the first heating tube is connected to one end of the second heating tube. The other end of the second heating tube is the liquid outlet. Both ends of the first heating tube and the second heating tube pass through the outer shell and extend to the outside of the outer shell.

[0015] Furthermore, the first heating tube includes a U-shaped tube, the second heating tube includes a U-shaped tube, and the first heating tube and the second heating tube are connected to each other through a compression fitting, which is fixed to the outside of the outer casing.

[0016] Furthermore, it also includes a support member disposed within the cavity; the support member is connected to the bent portions of the first heating tube and the second heating tube to fix the first heating tube and the second heating tube within the cavity; the ferrule connector is fixed to the outside of the outer shell.

[0017] Furthermore, the support member includes a first connecting portion and a second connecting portion that are perpendicular to each other and connected at their ends. The first connecting portion is connected to the bent portions of the plurality of heating tubes, and the second connecting portion is connected to the bottom of the outer casing.

[0018] Furthermore, the isolation tube includes a first isolation tube and a second isolation tube; the heating assembly includes a first heating assembly and a second heating assembly; the first isolation tube is sleeved outside the first heating tube, and the first heating assembly is arranged around the first isolation tube; the second isolation tube is sleeved outside the second heating tube, and the second heating assembly is arranged around the second isolation tube.

[0019] Furthermore, it also includes a temperature sensor and a temperature controller; the temperature sensor is disposed on the outside of the housing and connected to the liquid outlet, and is used to measure the temperature of the fluid flowing out of the liquid outlet; the temperature controller is connected to the first heating component and is used to control the heating temperature of the first heating component.

[0020] Furthermore, the first heating element is provided in multiple units, which are connected in parallel or in series with each other and electrically connected to a low-voltage DC power supply.

[0021] And / or the second heating element is provided in multiple ways, and the multiple second heating elements are connected in parallel or in series with each other and electrically connected to a low-voltage DC power supply.

[0022] Compared with the prior art, the supercritical fluid heating device provided in this application achieves uniform heating of the heating tube by setting an isolation tube between the heating component and the heating tube. The heating component first transfers heat to the isolation tube and then to the heating tube through the isolation tube, thereby achieving high heating efficiency and reducing the waste liquid generated during the heating process of supercritical fluid. At the same time, the supercritical heating device provided in this application sets the heating component outside the heating tube, so there is no need to consider the influence of high temperature, high pressure and highly corrosive environment on the heating device. The heating of fluid can be completed using a general heating device, which is convenient for design and saves costs. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A three-dimensional schematic diagram of the fluid supercritical heating device provided in the embodiments of this application;

[0025] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0026] Figure 3 for Figure 1 A cross-sectional view along the BB direction;

[0027] Figure 4 for Figure 1 A cross-sectional view along the CC direction;

[0028] Figure 5 for Figure 4 Enlarged view of point D in the middle. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0030] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0031] Supercritical water refers to water that has reached its critical pressure and critical temperature. At this point, the density of the liquid water, which expands due to the high temperature, is equal to the density of the gaseous water, which is compressed due to the high pressure. The water is in an intermediate state between gas and liquid, and therefore has unique physicochemical properties, making it widely applicable in the laboratory.

[0032] Current methods for preparing supercritical water in laboratories typically involve placing a heating device inside a container storing pure water. The device directly contacts the pure water to exchange heat, thus heating it. However, this method requires heating the pure water to its critical temperature and pressure. Conventional heating devices corrode when operating at these critical temperatures and pressures, necessitating modifications. These modifications are costly, and the direct contact between the device and the pure water results in low heating efficiency and generates significant waste liquid, hindering the improvement of pure water production efficiency.

[0033] This application uses a fluid heating device as an example; it is understood that the scope of protection of this application is not limited thereto.

[0034] Therefore, this application provides a fluid supercritical heating device with simple structure, low cost, and the ability to rapidly heat pure water, thereby improving the efficiency of supercritical pure water preparation.

[0035] Please refer to Figures 1 to 5 As shown, this is an embodiment of a fluid supercritical heating device 100 of this application, including: a shell 1, a heating tube 2, an isolation tube 3, a heating component 4, and a heat insulation component 5.

[0036] The outer casing 1 forms a cavity. The heating tube 2 is disposed inside the cavity. One end of the heating tube 2 is provided with an inlet 201 for fluid to enter, and the opposite end is provided with an outlet 202 for fluid to flow out. The inlet 201 and outlet 202 of the heating tube 2 pass through the outer casing 1 and extend to the outside of the outer casing 1.

[0037] An isolation tube 3 is disposed within the cavity and sleeved over the heating tube 2. A heating component 4 is disposed around the isolation tube 3 and is used to heat the heating tube 2. A heat insulation component 5 is disposed between the outer shell 1 and the heating component 4, and covers the heating component 4.

[0038] The fluid supercritical heating device 100 provided in this application sets the liquid inlet 201 and liquid outlet 202 of the heating tube 2 on the outside of the housing 1, which facilitates direct connection of the liquid inlet 201 and liquid outlet 202 to external pumps, valves, storage tanks and other fluid processing devices. It does not require reserving additional installation space inside the housing 1, so that the fluid supercritical heating device 100 provided in this application can be integrated into other fluid processing systems.

[0039] Meanwhile, the fluid supercritical heating device 100 provided in this application reduces the number of sealing points of the heating tube 2 inside the housing 1 by setting the inlet 201 and outlet 202 directly through the opening of the housing 1 and extending to the outside of the housing 1. This reduces the risk of supercritical fluid leakage caused by high pressure and high temperature. Furthermore, the sealing structure between the opening of the housing 1 and the heating tube 2 can be centrally designed to ensure the reliability of the entire fluid supercritical heating device 100 under high pressure and high temperature conditions.

[0040] Because supercritical water is extremely sensitive to temperature changes, if it is locally overheated during heating, the supercritical water may undergo thermal decomposition to produce gases such as hydrogen and oxygen, forming a two-phase flow of hydrogen and these gases with the water. This disrupts the homogeneity of the supercritical water, and the prepared supercritical water cannot meet the process requirements. Conversely, if the water is locally undercooled during heating, it will degenerate into liquid water, resulting in a significant decrease in its solubility. The prepared supercritical water will also fail to meet the process requirements.

[0041] The fluid supercritical heating device 100 provided in this application provides an isolation tube 3 between the heating tube 2 and the heating component 4. The heating component 4 is arranged around the isolation tube 3. The heat generated by the heating component 4 is first transferred to the isolation tube 3, and then conducted to the heating tube 2 through the inner wall of the isolation tube 3. This ensures that the heating tube 2 is heated evenly, which can avoid the heating component 4 directly contacting the heating tube 2, which may cause local overheating of the heating tube 2. This ensures that the fluid has a uniform temperature distribution along the axial direction in the heating tube 2, thereby ensuring that the fluid is heated evenly and reducing the waste liquid generated by pure water during the heating process.

[0042] The fluid supercritical heating device 100 provided in this application reduces the heat loss from the heating component 4 to the outside by providing a heat insulation component 5 between the outer shell 1 and the heating component 4. The heat insulation component 5 completely covers the heating component 4, thereby improving the heating effect of the fluid supercritical heating device 100.

[0043] Preferably, the outer casing 1 includes a housing 11, a first cover plate 12, and a second cover plate 13. The housing 11 forms a cavity to accommodate the heating tube 2, the isolation tube 3, the heating assembly 4, and the heat insulation assembly 5. The first cover plate 12 and the second cover plate 13 are detachably connected to the upper and lower surfaces of the housing 11 respectively by bolts, so that when the housing 11 and the components inside the housing 11 malfunction, the first cover plate 12 and the second cover plate 13 can be easily disassembled for maintenance.

[0044] Preferably, both the first cover plate 12 and the second cover plate 13 are provided with multiple mounting holes. These mounting holes are used to connect the fluid supercritical heating device provided in this application to devices such as power supplies and storage tanks, thereby facilitating the installation of the fluid supercritical heating device 100 provided in this application into the system to be used. The mounting holes can be a combination of elliptical wire slots and fixing holes, or other types of slots; this application does not limit the types of slots.

[0045] In some embodiments, the housing 11 is made of stainless steel, thereby improving the structural strength of the housing 11 and protecting the heating tube 2, the isolation tube 3, the heating assembly 4 and the heat insulation assembly 5 located within the cavity enclosed by the housing 11.

[0046] In other embodiments, the housing 11 may also be made of materials such as engineering plastics or tempered glass, and this application does not limit this.

[0047] In some embodiments, the housing 11 is rectangular in shape, which gives the housing 11 excellent structural stability and makes it less prone to shaking and flipping, so as to prevent damage to the devices located inside the housing 11.

[0048] In other embodiments, the shape of the housing 11 may also be other shapes other than cuboid, and this application does not limit this.

[0049] Preferably, the heating tube 2 includes a first heating tube 21 and a second heating tube 22. The first heating tube 21 is located above the second heating tube 22. One end of the first heating tube 21 is a liquid inlet 201, and the other end of the first heating tube 21 is connected to one end of the second heating tube 22. The other end of the second heating tube 22 is a liquid outlet 202.

[0050] The fluid supercritical heating device 100 provided in this application is configured with a first heating tube 21 and a second heating tube 22. The first heating tube 21 is located above the second heating tube 22, with one end of the first heating tube 21 being an inlet 201 and the other end of the second heating tube 22 being an outlet 202. Pure water enters from the upper inlet 201, flows through the first heating tube 21 and the second heating tube 22 to be heated to a supercritical state, and then flows out from the lower outlet 202. The flow direction of the pure water is consistent with the direction of its gravity, thereby reducing the driving force of the pump that drives the pure water flow by means of gravity. Especially when the pure water is at a low flow rate and when the pump that drives the pure water flow is on or off, the effect of gravity can assist the pure water to flow smoothly, avoiding insufficient pump power that would cause the pure water to stagnate in the first heating tube 21 or the second heating tube 22, thus preventing the pure water from being heated evenly.

[0051] Since the first heating tube 21 and the second heating tube 22 may have residual gas before heating, the design of the inlet 201 being located above the outlet 202 facilitates the discharge of gas from the first heating tube 21 and the second heating tube 22 before heating the pure water, preventing gas from accumulating in the lower second heating tube 22 and forming an airlock that obstructs the flow of pure water.

[0052] Meanwhile, with the inlet 201 located above and the outlet 202 located below, if the inlet 201 and / or the outlet 202 leak, the supercritical fluid in the first heating tube 21 and the second heating tube 22 will drip downwards naturally due to gravity instead of spraying upwards, thereby reducing the risk of direct impact on the operator and improving the safety of the fluid supercritical heating device 100 provided in this application.

[0053] Preferably, the first heating tube 21 is a U-shaped tube, and the second heating tube 22 is also a U-shaped tube.

[0054] This application designs the first heating tube 21 and the second heating tube 22 as U-shaped tubes. The U-shaped tubes can achieve a compact structure and a longer effective length through folding the pipeline, thereby reducing the space occupied in the cavity enclosed by the outer shell 1. This facilitates the arrangement of more devices in the outer shell 1 while increasing the residence time of pure water in the first heating tube 21 and the second heating tube 22, thereby increasing the heating time, ensuring that the pure water can reach the critical state, and reducing the generation of waste liquid.

[0055] When pure water is supercritically heated, the temperature generally exceeds the critical temperature of pure water. At this time, the tubing of the first heating tube 21 and the second heating tube 22 will expand due to the high temperature. Designing the first heating tube 21 and the second heating tube 22 as U-shaped tubes allows the bends to act as elastic buffer structures, absorbing the axial stress generated by the heating of the first heating tube 21 and the second heating tube 22, preventing the tubes from bending and deforming or breaking, and improving the service life of the first heating tube 21 and the second heating tube 22.

[0056] Preferably, the fluid supercritical heating device 100 provided in this application further includes a compression fitting 6. The portions of the first heating tube 21 and the second heating tube 22 located on the outside of the housing 1 are connected to each other through the compression fitting 6, and the compression fitting 6 is fixed to the outer surface of the housing 1.

[0057] In one embodiment, the ferrule connector 6 includes a ferrule straight connector 61, a ferrule tee connector 62, and a connecting pipe 63. The heating tube 2 also includes a short connecting pipe 23. The ferrule straight connector 61 is connected to the portions of the first heating tube 21 and the second heating tube 22 located on the outer side of the housing 1, and the ferrule tee connector 62 mates with the ferrule straight connector 61. The two ends of the connecting pipe 63 are connected to the ports of the first heating tube 21 and the second heating tube 22 respectively via the ferrule tee connector 62, thereby connecting the first heating tube 21 and the second heating tube 22. Two short connecting pipes 23 are provided, which are respectively connected to the other ports of the first heating tube 21 and the second heating tube 22 via the ferrule tee connector 62.

[0058] The fluid supercritical heating device 100 provided in this application facilitates the connection of the inlet 201 and outlet 202 of the heating tube 2 to other devices by setting a ferrule straight connector 61, a ferrule tee connector 62, a connecting pipe 63 and a short pipe 23, and forms a stable connection structure.

[0059] Preferably, the fluid supercritical heating device 100 provided in this application further includes a support member 7. The support member 7 is disposed in the cavity and connected to the bent portion of the first heating tube 21 and the second heating tube 22. The support member 7 fixes the first heating tube 21 and the second heating tube 22 in the cavity, thereby improving the structural stability of the first heating tube 21 and the second heating tube 22.

[0060] The support member 7 includes a first connecting portion 71 and a second connecting portion 72 that are perpendicular to each other and connected at their ends. The first connecting portion 71 and the second connecting portion 72 are L-shaped. The first connecting portion 71 is connected to the bent portions of the first heating tube 21 and the second heating tube 22 and is connected to the side of the outer casing 1, and the second connecting portion 72 is connected to the bottom of the outer casing 1.

[0061] The fluid supercritical heating device 100 provided in this application has an L-shaped support member 7, a first connecting part 71 connecting the first heating tube 21 and the second heating tube 22 and fixing it to the side of the outer shell 1, and a second connecting part 72 connecting to the bottom of the outer shell 1. The structure is stable and can improve the structural strength of the fluid supercritical heating device.

[0062] The isolation tube 3 includes a first isolation tube 31 and a second isolation tube 32. The heating assembly 4 includes a first heating assembly 41 and a second heating assembly 42. The first isolation tube 31 is sleeved outside the first heating tube 21, and the first heating assembly 41 is arranged around the first isolation tube 31. The second isolation tube 32 is sleeved outside the second heating tube 22, and the second heating assembly 42 is arranged around the second isolation tube 32.

[0063] This application heats the first heating tube 21 and the second heating tube 22 by setting a first isolation tube 31 and a first heating component 41 and a second isolation tube 32 and a second heating component 42 respectively, thereby ensuring that the pure water in the first heating tube 21 and the second heating tube 22 can be fully heated, thereby improving heating efficiency, reducing waste liquid generated during the preparation of supercritical pure water, and improving conversion efficiency.

[0064] Preferably, the first isolation tube 31 and the second isolation tube 32 are circular, straight-through corundum tubes to ensure the isolation effect between the heating component 4 and the heating tube 2. A filler with high thermal conductivity can be installed between the isolation tube 3 and the heating component 4, and between the isolation tube 3 and the heating tube 2, to fill the gaps between the isolation tube 3 and the heating component 4, and between the isolation tube 3 and the heating tube 2, thereby improving the thermal conductivity of the isolation tube 3 and increasing the heating efficiency.

[0065] Preferably, the heating component 4 is a heating wire or heating strip, made of a high-temperature resistant alloy material, thereby improving the heating effect on the heating tube 2 and preventing the heating component 4 from being damaged under high temperature and high pressure.

[0066] In one embodiment, the heating element 4 is a nichrome wire. The first heating element 41 and the second heating element 42 are respectively arranged around the first isolation tube 31 and the second isolation tube 32 to heat the first heating tube 21 and the second heating tube 22. Since the first heating element 41 and the second heating element 42 are made of nichrome wire, they are provided with lead wires for connection to a power source, thereby supplying power to the first heating element 41 and the second heating element 42. The lead wire portions of the first heating element 41 and the second heating element 42 pass through the first cover plate 12 and the second cover plate 13 respectively, and are connected and fixed to the first cover plate 12 and the second cover plate 13 by screws, thereby improving the stability of the first heating element 41 and the second heating element 42.

[0067] In one embodiment, the heating component 4 further includes a magnetic bead 43. The magnetic bead 43 is sleeved on the lead portion of the first heating component 41 to insulate the first heating component 41, and the magnetic bead 43 itself can also improve the stability of the first heating component 41.

[0068] In another embodiment, the magnetic bead 43 may also be sleeved on the lead wire portion of the second heating component 42, and multiple magnetic beads 43 may be provided. This application does not limit this.

[0069] Preferably, the magnetic bead 43 described in this application is a heat-resistant magnetic bead, which can work stably in the high temperature and high pressure environment required to heat the fluid to the supercritical state.

[0070] Preferably, multiple first heating elements 41 are provided, which are connected in parallel or in series and electrically connected to a low-voltage DC power supply. Similarly, multiple second heating elements 42 can also be provided, which are connected in parallel or in series and electrically connected to a low-voltage DC power supply.

[0071] This application connects the first heating component 41 and the second heating component 42 to a low-voltage DC power supply. The low-voltage DC power supply supplies power to the first heating component 41 and the second heating component 42, reducing the risk of injury to operators in case of leakage and improving the safety of the fluid supercritical heating device 100.

[0072] Meanwhile, multiple first heating components 41 and multiple second heating components 42 are provided, and the multiple first heating components 41 and multiple second heating components 42 heat the first heating tube 21 and the second heating tube 22 respectively, which can improve the heating efficiency of the heating components 4.

[0073] Optionally, the number of the first heating component 41 and the second heating component 42 and the way they surround the first isolation tube 31 and the second isolation tube 32 can be adjusted according to the volume and flow rate of the pure water to be heated, thereby adjusting the diameter and length of the heating component 4 and adjusting the overall power of the heating component 4 to meet the heating requirements of pure water with different volumes and flow rates. The operation is simple and convenient and easy to implement.

[0074] Preferably, the supercritical fluid heating device 100 provided in this application further includes a temperature sensor 8 and a temperature controller (not shown). The temperature sensor 8 is disposed on the outside of the housing and connected to the liquid outlet 202, and is used to measure the temperature of the fluid flowing out of the liquid outlet 202.

[0075] This application places the temperature sensor 8 on the outside of the housing 1 to prevent the high temperature and high pressure environment inside the housing 1 from affecting the temperature sensor 8. Furthermore, the temperature sensor 8 directly detects the temperature of the fluid flowing out from the liquid outlet 202, resulting in more accurate detection results.

[0076] The first heating component 41 and the second heating component 42 are connected to the power supply. When the first heating component 41 and the second heating component 42 are working, the temperature controller is connected to the first heating component 41 and controls the heating temperature of the first heating component 41 according to the temperature given by the temperature sensor. The second heating component 42 is always in the state of heating the second heating tube 22.

[0077] Since a single heating element is insufficient to heat pure water to the required supercritical temperature, the lower heating element 42 is uncontrolled. It continuously heats the liquid to a temperature closer to the target. Furthermore, because the lower heating element 42 heats the liquid, the heat rises, facilitating rapid heating of the upper heating element 41. Therefore, only the temperature of the first heating element 41 needs to be controlled. Simultaneously, since the second heating element 42 does not require control, its power can be set lower than that of the first heating element 41, resulting in a longer service life.

[0078] Preferably, the heat insulation component 5 includes a first heat insulation component 51 and a second heat insulation component 52. The first heat insulation component 51 is disposed on the outside of the heating component 4 and completely encloses the heating component 4. The second heat insulation component 52 is disposed between the first heat insulation component 51 and the outer shell 1. The heat insulation coefficient of the second heat insulation component 52 is greater than that of the first heat insulation component 51.

[0079] This application provides a first heat insulation component 51 and a second heat insulation component 52. The first heat insulation component 51 is located on the outside of the heating component 4 and wraps around the heating component 4. This can block the radiant heat and convective heat from the heating component 4 toward the outer shell 1, reduce the heat loss of the heating component 4, and ensure the heating effect of the heating component 4.

[0080] Meanwhile, this application places the second heat insulation component 52 between the first heat insulation component 51 and the outer shell 1. The second heat insulation component 52 can further block the heat transmitted from the first heat insulation component 5, and the heat insulation coefficient of the second heat insulation component 52 is greater than that of the first heat insulation component 5. Thus, the second heat insulation component 52 and the first heat insulation component 51 form a double-layer heat insulation structure. The double-layer heat insulation structure can form a thermal resistance gradient, resulting in a higher total series thermal resistance, improving the heat insulation performance of the first heat insulation component 51 and the second heat insulation component 52, significantly reducing the heat loss of the fluid supercritical heating device 100, and ultimately improving the heating effect.

[0081] Optionally, the first thermal insulation component 51 is a high-silica fiberglass tape. The second thermal insulation component 52 is aluminum silicate insulation cotton. The high-silica fiberglass tape and the aluminum silicate insulation cotton form a double-layer insulation structure, which can effectively prevent heat loss and improve the heating effect of the fluid supercritical heating device 100.

[0082] The fluid supercritical heating device 100 provided in this application can be used to supercritically heat pure water to obtain supercritical pure water, and can also be used to heat other fluids such as carbon dioxide, etc. This application does not limit this.

[0083] The fluid supercritical heating device 100 provided in this application uses common materials, which are easy to purchase and inexpensive, which helps to shorten the procurement period and processing cycle, and facilitates subsequent maintenance and replacement.

[0084] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; many substitutions, modifications and variations of these embodiments will be apparent to those skilled in the art based on the foregoing description, and for the sake of brevity they are not provided in the details.

[0085] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A fluid supercritical heating apparatus, characterized by, include: The outer shell, which encloses a cavity; A heating element is disposed within the cavity. One end of the heating element has an inlet for fluid to enter, and the other end has an outlet for fluid to flow out. The inlet and outlet of the heating element pass through the outer shell and extend to the outside of the outer shell. An isolation tube is disposed inside the cavity and sleeved outside the heating tube; A heating assembly, which is disposed around the isolation tube and is used to heat the heating tube through the isolation tube; A heat insulation component is disposed between the outer shell and the heating component, and covers the heating component.

2. The fluid supercritical heating apparatus of claim 1, wherein, The heat insulation component includes a first heat insulation component and a second heat insulation component; the first heat insulation component is disposed outside the heating component and completely encloses the heating component; the second heat insulation component is disposed between the first heat insulation component and the outer shell, and the heat insulation coefficient of the second heat insulation component is greater than that of the first heat insulation component.

3. The fluid supercritical heating apparatus of claim 2, wherein, The first thermal insulation component includes high-silica fiberglass tape; And / or the second thermal insulation component includes aluminum silicate insulation cotton.

4. The fluid supercritical heating apparatus of claim 1, wherein, The heating element includes a first heating element and a second heating element. The first heating element is located above the second heating element. One end of the first heating element is the liquid inlet. The other end of the first heating element is connected to one end of the second heating element. The other end of the second heating element is the liquid outlet. Both ends of the first heating element and the second heating element pass through the outer shell and extend to the outside of the outer shell.

5. The fluid supercritical heating apparatus of claim 4, wherein, The first heating element includes a U-shaped tube, the second heating element includes a U-shaped tube, and the first heating element and the second heating element are connected to each other through a compression fitting, which is fixed to the outside of the outer shell.

6. The fluid supercritical heating apparatus of claim 5, wherein, It also includes a support member disposed within the cavity; the support member is connected to the bent portions of the first heating tube and the second heating tube to fix the first heating tube and the second heating tube within the cavity; the ferrule connector is fixed to the outside of the outer shell.

7. The fluid supercritical heating apparatus of claim 6, wherein, The support member includes a first connecting part and a second connecting part that are perpendicular to each other and connected at their ends. The first connecting part is connected to the bent parts of the plurality of heating tubes, and the second connecting part is connected to the bottom of the outer shell.

8. The fluid supercritical heating device according to claim 4, characterized in that, The isolation tube includes a first isolation tube and a second isolation tube; the heating assembly includes a first heating assembly and a second heating assembly; the first isolation tube is sleeved outside the first heating tube, and the first heating assembly is arranged around the first isolation tube; the second isolation tube is sleeved outside the second heating tube, and the second heating assembly is arranged around the second isolation tube.

9. The fluid supercritical heating apparatus of claim 8, wherein, It also includes a temperature sensor and a temperature controller; the temperature sensor is disposed on the outside of the housing and connected to the liquid outlet, and is used to measure the temperature of the fluid flowing out of the liquid outlet; the temperature controller is connected to the first heating component and is used to control the heating temperature of the first heating component.

10. The fluid supercritical heating apparatus of claim 9, wherein, The first heating element is provided in multiple ways, and the multiple first heating elements are connected in parallel or in series with each other and are electrically connected to a low-voltage DC power supply. And / or, the second heating element is provided in multiple units, and the multiple second heating elements are connected in parallel or in series with each other and electrically connected to a low-voltage DC power supply.

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