Hydrogen iodide decomposition device and working method

Abstract

The invention discloses a hydrogen iodide decomposition device and a working method. The hydrogen iodide decomposition device comprises an outer cylinder, a flange D, a flange E, a valve C and a heating device, the outer diameter of the outer cylinder is R1, the inner diameter of the outer cylinder is R2, and the length of the outer cylinder is L1; the flange D and the flange E are through hole flanges, the inner diameter of the flange D and the inner diameter of the flange E are equal to the inner diameter R2 of the outer cylinder, the thickness of the flange D and the flange E is L2, the flange D and the flange E are welded to the left end and the right end of the outer cylinder respectively, a hole is drilled in the outer cylinder close to the flange D, the hole diameter is R6, a short pipe is welded to the drilled hole and connected to the valve C, and the heating device wraps the outer wall of the outer cylinder. In the working process, the device is in a vertical state, the flange A faces downwards, the flange F faces upwards, the flow of mixed liquid entering the device is adjusted through the valve C, and the flow of the mixed liquid is matched with the heating device to ensure that the temperature of a working medium near the flange F is not lower than 550 DEG C. The method has the advantages of being simple in technological process and low in energy consumption.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydrogen production by the sulfur-iodine cycle, and particularly relates to a hydrogen iodide decomposition device and a working method thereof. Background Art

[0002] Hydrogen production by the sulfur-iodine cycle is a method of producing hydrogen by using chemical reactions of sulfur and iodine. The sulfur-iodine cycle hydrogen production technology is based on a series of chemical reactions, which are carried out at specific temperatures and pressures and achieved through heat energy input. This cycle generally includes four main steps: hydrogen sulfide decomposition, sulfide oxidation, iodine oxidation, and iodine reduction, or three steps: the Bunsen reaction, hydrogen iodide decomposition, and sulfuric acid decomposition.

[0003] In the existing sulfur-iodine cycle hydrogen production, for the catalytic decomposition of hydrogen iodide, the hydrogen iodide solution needs to be heated to above 500 °C and fully contacted with the catalyst to achieve partial decomposition. The undissociated hydrogen iodide solution at high temperature and the decomposition products need to be cooled to room temperature to recover hydrogen and recycle substances, so the system is relatively complex. During the cooling process, iodine condensation and deposition are likely to occur if not well controlled, causing system blockage. Summary of the Invention

[0004] Aiming at the problems existing in the existing decomposition system, the present invention provides a hydrogen iodide decomposition device and a working method with a simple process flow and low energy consumption.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A hydrogen iodide decomposition device includes an outer cylinder, a D flange, an E flange, a C valve, and a heating device; the outer diameter of the outer cylinder is R1, the inner diameter is R2, and the length of the outer cylinder is L1; the D flange and the E flange are through-hole flanges, the inner diameters of which are equal to the inner diameter R2 of the outer cylinder, and the thickness of each is L2. The D flange and the E flange are respectively welded to the left and right ends of the outer cylinder. A hole with a diameter of R6 is drilled on the outer cylinder near the D flange, and a short pipe is welded to the hole and connected to the C valve. The heating device is wrapped around the outer wall of the outer cylinder.

[0006] A further improvement of the present invention is that it further includes an inner cylinder, a B flange, a C flange, an A valve, a B valve, and a cooling device. The length of the inner cylinder is L3, L3 is greater than the sum of 1.5 times L1 and 2 times L2. The outer diameter of the inner cylinder is R3, and the inner diameter is R4, and R3 is less than R2; The B flange and the C flange are through-hole flanges, the inner diameters of which are equal to the inner diameter R4 of the inner cylinder, and the thickness of each is L2. The B flange is welded to the left side of the inner cylinder. The C flange is a mating flange of the D flange. When the inner cylinder is sleeved inside the outer cylinder and the right ends are flush, the right side surface of the C flange is hermetically connected to the left side surface of the D flange, and the C flange is welded to the outside of the inner cylinder; Drill holes on the inner cylinder near the B flange with a hole diameter of R6. Weld a short pipe on the drilled hole and connect it to the A valve. Drill a hole at one-third of the distance between the B flange and the C flange near the B flange with a hole diameter of R6. Weld a short pipe on the drilled hole and connect it to the B valve. The cooling device is wrapped around the outer wall of the inner cylinder between the B flange and the C flange.

[0007] A further improvement of the present invention is that it further includes an A flange, a catalyst positioning rod, and a catalyst positioning plate. The A flange is a matching sealing flange for the B flange. The length of the catalyst positioning rod is greater than half of L3 and less than L3, and the diameter R5 is less than one-third of R4 and greater than one-fifth of R4. The catalyst positioning rod is welded on the left side surface of the A flange. External threads are made on the right half section of the catalyst positioning rod. An internal thread is made by drilling a hole in the center of the catalyst positioning plate, and it is sleeved on the external thread of the catalyst positioning rod. Uniform holes are drilled on the catalyst positioning plate with a hole diameter less than R5.

[0008] A further improvement of the present invention is that it further includes an F flange and a conical plug. The F flange is a matching sealing flange for the E flange. The left diameter of the conical plug is 0.9 times R4, the right diameter is 1.1 times R4, and the thickness is 1.5 times L2. The right side of the conical plug is welded to the center of the right side of the F flange.

[0009] A further improvement of the present invention is that the annular flow cross-sectional area S1 formed by the outer cylinder and the inner cylinder, and the flow cross-sectional area S2 of the inner cylinder. S2 is greater than 1.5 times S1 and less than 3 times S1. Drill holes on the right side wall of the inner cylinder, and the sum of the drilling areas is not less than S2.

[0010] A further improvement of the present invention is that a sealing gasket is added between the A flange and the B flange, between the C flange and the D flange, and between the E flange and the F flange.

[0011] A further improvement of the present invention is that the conical plug is inserted into the inner cylinder and sealed by pressing.

[0012] A working method of a hydrogen iodide decomposition device. During the working process, the device is in a vertical state, with the A flange facing down and the F flange facing up. Rely on the C valve to adjust the flow rate of the mixed liquid entering the device, and the flow rate of the mixed liquid cooperates with the heating device to ensure that the working medium temperature near the F flange is not lower than 550 °C; Fill the catalyst between the catalyst positioning plate and the conical plug, and adjust the catalyst filling amount by adjusting the position of the catalyst positioning plate; Rely on adjusting the power of the cooling device to ensure that the temperature of the gas discharged from the B valve is lower than 35 °C.

[0013] A further improvement of the present invention is that it further includes: adjusting the system pressure by adjusting the B valve; ensuring that the liquid level in the inner pipe is not higher than the discharge port of the B valve by adjusting the A valve.

[0014] A further improvement of the present invention is that it further includes: connecting multiple devices in parallel to achieve the large-scale decomposition of hydrogen iodide.

[0015] Compared with the prior art, the present invention has at least the following beneficial technical effects: The hydrogen iodide decomposition device and working method provided by the present invention achieve external heating through a heating device in the outer tube, and the heating process is easy to implement; the hydrogen iodide solution is heated, vaporized and heated up to the decomposition temperature in the gap between the inner and outer tubes, and the decomposition products flow out countercurrently in the inner tube. The decomposition products transfer heat to the hydrogen iodide solution in the gap between the inner and outer tubes. On the one hand, it is beneficial to the heating of the hydrogen iodide solution, and on the other hand, it is beneficial to the cooling of the decomposition products. The heating, vaporization, decomposition and cooling of hydrogen iodide are realized in one device, greatly simplifying the device. Since hydrogen iodide is partially decomposed and the hydrogen iodide solution condenses first, the iodine vapor can be dissolved in the hydrogen iodide solution after condensation, avoiding device blockage.

[0016] Furthermore, by moving the catalyst positioning plate in the present invention, the loading amount of the catalyst can be easily adjusted. By using the hydrogen iodide inlet regulating valve and the heating power in combination, the decomposition rate can be adjusted according to requirements. By adjusting the power of the cooling device, the condensation of the decomposition products and the separation from hydrogen can be realized. By adjusting the gas discharge valve, the device pressure can be controlled. By adjusting the decomposition product liquid valve, the liquid level of the condensation product can be controlled. Description of the Drawings

[0017] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic structural diagram of the outer cylinder part of the present invention.

[0019] Figure 2 It is a schematic structural diagram of the inner cylinder part of the present invention.

[0020] Figure 3 It is a schematic structural diagram of the catalyst positioning rod part of the present invention.

[0021] Figure 4 It is a schematic structural diagram of the conical plug part of the present invention.

[0022] Figure 5 It is a schematic overall structural diagram of a hydrogen iodide decomposition device of the present invention.

[0023] Description of the Reference Numerals in the Drawings: 1. Outer cylinder, 2. Inner cylinder, 3. Flange A, 4. Flange B, 5. Flange C, 6. Flange D, 7. Flange E, 8. Flange F, 9. Valve A, 10. Valve B, 11. Valve C, 12. Conical plug, 13. Heating device, 14. Cooling device, 15. Catalyst positioning rod, 16. Catalyst positioning plate. Detailed implementation manners

[0024] In the following text, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present invention. Therefore, the drawings and the description are considered to be exemplary in nature rather than restrictive.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.

[0026] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0027] In the present invention, unless otherwise clearly specified and defined, the terms "install", "connect", "couple", "fix", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0029] It should be understood that when used in this specification and the appended claims, the terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or their groups.

[0030] It should also be understood that the terms used in the specification of the present invention are merely for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0031] It should be further understood that the term " / and" used in the specification of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0032] Structural schematic diagrams according to various disclosed embodiments of the present invention are shown in the drawings. These figures are not drawn to scale, where for the purpose of clear expression, some details are enlarged and some details may be omitted. The shapes of various regions and layers shown in the figures, and their relative sizes and positional relationships are merely exemplary, and may actually deviate due to manufacturing tolerances or technical limitations, and those skilled in the art can design regions / layers with different shapes, sizes and relative positions according to actual requirements.

[0033] Embodiments of the present invention will be described in detail below with reference to the drawings.

[0034] Embodiment 1 As Figures 1 to 5As shown in the figure, a hydrogen iodide decomposition device provided in this embodiment includes an outer cylinder 1, a D flange 6, an E flange 7, a C valve 11, and a heating device 13. The outer diameter of the outer cylinder 1 is R1, the inner diameter is R2, and the length of the outer cylinder 1 is L1. The D flange 6 and the E flange 7 are through-hole flanges, the inner diameters of which are equal to the inner diameter R2 of the outer cylinder 1, and the thicknesses of both are L2. The D flange 6 and the E flange 7 are respectively welded to the left and right ends of the outer cylinder 1. A hole is drilled in the outer cylinder 1 near the D flange 6, the hole diameter is R6, and a short pipe is welded to the hole and connected to the C valve 11. The heating device 13 is wrapped around the outer wall of the outer cylinder 1. In the present invention, external heating is realized through the heating device on the outer pipe, and the heating process is easy to achieve. The hydrogen iodide solution is heated, vaporized, and heated up to the decomposition temperature in the gap between the inner and outer pipes. The decomposition products flow out countercurrently in the inner pipe, and the decomposition products transfer heat to the hydrogen iodide solution in the gap between the inner and outer pipes, which is beneficial to the heating of the hydrogen iodide solution on the one hand and the cooling of the decomposition products on the other hand. The heating, vaporization, decomposition, and cooling of hydrogen iodide are realized in one device, greatly simplifying the device.

[0035] In this embodiment, it further includes an inner cylinder 2, a B flange 4, a C flange 5, an A valve 9, a B valve 10, and a cooling device 14. The length of the inner cylinder 2 is L3, and L3 is greater than the sum of 1.5 times L1 and 2 times L2. The outer diameter of the inner cylinder 2 is R3, the inner diameter is R4, and R3 is less than R2. The B flange 4 and the C flange 5 are through-hole flanges, the inner diameters of which are equal to the inner diameter R4 of the inner cylinder 2, and the thicknesses of both are L2. The B flange 4 is welded to the left side of the inner cylinder 2. The C flange 5 is a matching flange of the D flange 6. When the inner cylinder 2 is sleeved inside the outer cylinder 1 and the right ends are flush, the right side surface of the C flange 5 is hermetically connected to the left side surface of the D flange 6, and the C flange 5 is welded to the outside of the inner cylinder 2. A hole is drilled in the inner cylinder 2 near the B flange 4, the hole diameter is R6, and a short pipe is welded to the hole and connected to the A valve 9. A hole is drilled at one-third of the distance between the B flange 4 and the C flange 5 near the B flange 4, the hole diameter is R6, and a short pipe is welded to the hole and connected to the B valve 10. The cooling device 14 is wrapped around the outer wall of the inner cylinder 2 between the B flange 4 and the C flange 5. The cooling device 14 absorbs the heat transferred from the outer wall of the inner cylinder 2 through the cooling medium inside it. The heat transfer causes the temperature of the medium inside the inner cylinder 2 to drop, thereby realizing the condensation of the decomposition products. The power of the cooling device can be adjusted by adjusting the flow rate, temperature, or circulation speed of the cooling medium. The adjustment of the power directly affects the cooling efficiency, thereby determining the cooling speed and final temperature of the medium inside the inner cylinder 2. As the temperature of the medium inside the inner cylinder 2 decreases, the decomposition products reach their condensation point and are converted into a liquid or solid state, thereby achieving a preliminary separation from gaseous hydrogen. The form and position of the condensation products depend on the cooling rate, medium properties, and the geometric structure of the inner cylinder 2. Therefore, by adjusting the power of the cooling device, the condensation of the decomposition products and the separation from hydrogen can be realized.

[0036] In this embodiment, it further includes flange A 3, catalyst positioning rod 15 and catalyst positioning plate 16. Flange A 3 is a supporting sealing flange for flange B 4. The length of catalyst positioning rod 15 is greater than half of L3 and less than L3, and the diameter R5 is less than one-third of R4 and greater than one-fifth of R4. Catalyst positioning rod 15 is welded on the left side surface of flange A 3. External threads are made on the right half section of catalyst positioning rod 15. An internal thread is made by drilling a hole in the center of catalyst positioning plate 16, and it is sleeved on the external threads of catalyst positioning rod 15. Holes are evenly drilled on catalyst positioning plate 16, and the hole diameter is less than R5. The traditional catalyst loading method is often fixed and difficult to be flexibly adjusted according to actual needs, which to a certain extent limits the optimization of reaction conditions and the improvement of process efficiency. The catalyst positioning plate is a key component in the present invention, and its design needs to ensure that it can stably support the catalyst and has mobility. The movement of the catalyst positioning plate can be realized through a mechanical transmission system, such as an electric push rod, a hydraulic cylinder or a lead screw nut mechanism, etc. When it is necessary to adjust the catalyst loading amount, the operator can control the movement mechanism to make the catalyst positioning plate move in the reactor. The movement of the positioning plate will change the stacking height or distribution range of the catalyst in the reactor, so as to realize the adjustment of the loading amount.

[0037] In this embodiment, it further includes flange F 8 and conical plug 12. Flange F 8 is a supporting sealing flange for flange E 7. The left diameter of conical plug 12 is 0.9 times of R4, the right diameter is 1.1 times of R4, and the thickness is 1.5 times of L2. The right side of conical plug 12 is welded to the center of the right side of flange F 8.

[0038] In this embodiment, the annular flow cross-sectional area S1 formed by outer cylinder 1 and inner cylinder 2, the flow cross-sectional area S2 of inner cylinder 2, S2 is greater than 1.5 times of S1 and less than 3 times of S1. Holes are drilled on the right side wall of inner cylinder 2, and the sum of the drilling areas is not less than S2.

[0039] In this embodiment, a sealing washer is added between flange A 3 and flange B 4, a sealing washer is added between flange C 5 and flange D 6, and a sealing washer is added between flange E 7 and flange F 8.

[0040] In this embodiment, conical plug 12 is inserted into inner cylinder 2 and sealed by pressing.

[0041] Embodiment 2 As Figures 1 to 5As shown in the figure, a hydrogen iodide decomposition device provided in this embodiment includes an outer cylinder 1, a D flange 6, an E flange 7, a C valve 11, a heating device 13, an inner cylinder 2, a B flange 4, a C flange 5, an A valve 9, a B valve 10, a cooling device 14, an A flange 3, a catalyst positioning rod 15, a catalyst positioning plate 16, an F flange 8, and a conical plug 12. Among them, the outer tube: the outer diameter is 60 mm, the wall thickness is 8 mm, the inner diameter is 44 mm, and the length is 1000 mm; the D flange and the E flange are welded at both ends, and the E flange is mated with the F flange to seal one end of the outer tube; a 10-mm hole is drilled near the D flange to connect the C valve, and the C valve is a control valve for the inlet of the hydrogen iodide solution; an electric heating wire is wound outside, and the maximum temperature reaches 550 °C.

[0042] The inner tube: the outer diameter is 42 mm, the wall thickness is 4 mm, the inner diameter is 34 mm, and the length is 1500 mm; the inner tube is sleeved inside the outer tube, and the upper end is aligned with the upper end of the outer tube. Holes are drilled in the side wall in the area of 10 mm to 30 mm near the upper end: there is a protrusion in the middle of the F flange, which is inserted into the inner tube, and the protrusion has a certain taper to seal the upper end of the inner tube; the C flange is welded in the middle of the inner tube and paired with the D flange to seal the outer tube; a hole is drilled near the B flange, and the 10-mm hole is connected to the A valve, and the A valve is a control valve for discharging the decomposition solution; a cooling water coil is added between the B flange and the C flange to make the temperature of the solution discharged from the A valve lower than 40 °C; a 10-mm hole is drilled above the liquid level to connect the B valve, and the B valve is a decomposition gas discharge valve.

[0043] The A flange is mated with the B flange to seal the lower end of the inner tube; a titanium rod with a diameter of 10 mm and a length of 1000 mm is welded in the middle of the A flange, threaded in the range of 500 to 1000 mm, and a nut with a diameter of 33 mm and a thickness of 10 mm is sleeved on the screw rod. The nut is evenly drilled with holes, which can hold the catalyst, but the decomposition products can pass through.

[0044] All materials are made of TC4 material. TC4 material, also known as Ti-6Al-4V, is a widely used titanium alloy.

[0045] Example 3 As Figures 1 to 5 shown in the figure, a working method of a hydrogen iodide decomposition device provided in this embodiment, during the working process, the device is in a vertical state, the A flange 3 faces downwards, the F flange 8 faces upwards, and the flow rate of the mixed liquid entering the device is adjusted by relying on the C valve 11. The flow rate of the mixed liquid is coordinated with the heating device 13 to ensure that the temperature of the working medium near the F flange 8 is not lower than 550 °C; a catalyst is filled between the catalyst positioning plate 16 and the conical plug 12, and the filling amount of the catalyst is adjusted by relying on adjusting the position of the catalyst positioning plate 16; by adjusting the power of the cooling device 14, it is ensured that the temperature of the gas discharged from the B valve 10 is lower than 35 °C.

[0046] In this embodiment, it further includes: adjusting the pressure in the system by adjusting the B valve 10; ensuring that the liquid level in the inner tube is not higher than the discharge port of the B valve 10 by adjusting the A valve 9.

[0047] In this embodiment, it further includes that the power plant can parallel multiple devices according to the magnitude of the hydrogen iodide production to achieve the large-scale hydrogen iodide decomposition.

[0048] Embodiment 4 As Figures 1 to 5 shown, a working method of a hydrogen iodide decomposition device provided in this embodiment assembles 100 devices in a 10-by-10 matrix horizontally and vertically to form a 10X10 cube. The 100 heating devices 13 are replaced by a large heating heat exchanger, and the heating heat source uses the flue gas at 600 °C from the power plant boiler. The 100 cooling devices 14 are replaced by a large cooling heat exchanger, and the cooling source uses the circulating cooling water of the power plant. The inlets of the C valves 11 of the 100 devices are combined and connected to an inlet header, and the entry of the hydrogen iodide solution is controlled by one large pump. The outlets of the B valves 10 of the 100 devices are connected to a hydrogen outlet header, and the discharge of hydrogen is controlled by a hydrogen compressor. The outlets of the A valves 9 of the 100 devices are connected to a discharge liquid outlet header, and the discharge of the decomposition liquid is controlled by one large pump. Originally, one device could produce 1 m³ / h of hydrogen, and the large device composed of 100 small devices can produce 100 m³ / h of hydrogen. The power plant can use multiple large devices to achieve large-scale hydrogen production according to the magnitude of the hydrogen iodide production.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed within the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0050] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for explaining the technical idea of the present invention and cannot be used to limit the protection scope of the present invention. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.

Claims

1. A hydrogen iodide decomposition device, characterized in that, It includes an outer cylinder (1), a D flange (6), an E flange (7), a C valve (11), and a heating device (13); The outer cylinder (1) has an outer diameter of R1 and an inner diameter of R2, and the length of the outer cylinder (1) is L1; the D flange (6) and the E flange (7) are through-hole flanges, the inner diameters of which are equal to the inner diameter R2 of the outer cylinder (1), and the thickness of both is L2. The D flange (6) and the E flange (7) are respectively welded to the left and right ends of the outer cylinder (1). A hole with a diameter of R6 is drilled on the outer cylinder (1) near the D flange (6), and a short pipe is welded to the hole and connected to the C valve (11). The heating device (13) is wrapped around the outer wall of the outer cylinder (1).

2. The hydrogen iodide decomposition device according to claim 1, characterized in that, It further includes an inner cylinder (2), a B flange (4), a C flange (5), an A valve (9), a B valve (10), and a cooling device (14). The length of the inner cylinder (2) is L3, and L3 is greater than the sum of 1.5 times L1 and 2 times L2. The outer diameter of the inner cylinder (2) is R3, and the inner diameter is R4, and R3 is less than R2; The B flange (4) and the C flange (5) are through-hole flanges, the inner diameters of which are equal to the inner diameter R4 of the inner cylinder (2), and the thickness of both is L2. The B flange (4) is welded to the left side of the inner cylinder (2). The C flange (5) is a mating flange of the D flange (6). When the inner cylinder (2) is sleeved inside the outer cylinder (1) and the right ends are flush, the right side surface of the C flange (5) is hermetically connected to the left side surface of the D flange (6), and the C flange (5) is welded to the outside of the inner cylinder (2); A hole with a diameter of R6 is drilled on the inner cylinder (2) near the B flange (4), and a short pipe is welded to the hole and connected to the A valve (9). A hole with a diameter of R6 is drilled at one-third of the distance between the B flange (4) and the C flange (5) near the B flange (4), and a short pipe is welded to the hole and connected to the B valve (10). The cooling device (14) is wrapped around the outer wall of the inner cylinder (2) between the B flange (4) and the C flange (5).

3. The hydrogen iodide decomposition device according to claim 2, characterized in that, It further includes an A flange (3), a catalyst positioning rod (15), and a catalyst positioning plate (16). The A flange (3) is a mating sealing flange of the B flange (4). The length of the catalyst positioning rod (15) is greater than half of L3 and less than L3, and the diameter R5 is less than one-third of R4 and greater than one-fifth of R4. The catalyst positioning rod (15) is welded to the left side surface of the A flange (3). External threads are made on the right half section of the catalyst positioning rod (15). Internal threads are made by drilling a hole in the center of the catalyst positioning plate (16), and it is sleeved on the external threads of the catalyst positioning rod (15). Uniform holes are drilled on the catalyst positioning plate (16), and the hole diameter is less than R5.

4. The hydrogen iodide decomposition device according to claim 3, characterized in that, It further includes an F flange (8) and a conical plug (12). The F flange (8) is a mating sealing flange of the E flange (7). The left diameter of the conical plug (12) is 0.9 times R4, the right diameter is 1.1 times R4, and the thickness is 1.5 times L2. The right side of the conical plug (12) is welded to the center of the right side of the F flange (8).

5. An apparatus for decomposing hydrogen iodide according to claim 4, characterized in that, The annular flow cross-sectional area S1 is formed between the outer cylinder (1) and the inner cylinder (2), and the flow cross-sectional area of the inner cylinder (2) is S2. S2 is greater than 1.5 times S1 and less than 3 times S1. Holes are drilled on the right side wall of the inner cylinder (2), and the sum of the drilling areas is not less than S2.

6. The hydrogen iodide decomposition device according to claim 4, characterized in that, A sealing washer is added between flange A (3) and flange B (4), between flange C (5) and flange D (6), and between flange E (7) and flange F (8).

7. An apparatus for decomposing hydrogen iodide according to claim 4, characterized in that, The conical plug (12) is inserted into the inner cylinder (2) and sealed by pressing.

8. The working method of a hydrogen iodide decomposition device according to claim 4, characterized in that, During the working process, the device is in a vertical state, with flange A (3) facing down and flange F (8) facing up. The flow rate of the mixed liquid entering the device is adjusted by valve C (11). The flow rate of the mixed liquid cooperates with the heating device (13) to ensure that the working medium temperature near flange F (8) is not lower than 550 °C; Catalyst is filled between the catalyst positioning plate (16) and the conical plug (12), and the catalyst filling amount is adjusted by adjusting the position of the catalyst positioning plate (16); By adjusting the power of the cooling device (14), ensure that the temperature of the gas discharged by valve B (10) is lower than 35 °C.

9. The working method of a hydrogen iodide decomposition device according to claim 8, characterized in that, It also includes: Adjust the system pressure by adjusting valve B (10); ensure that the liquid level in the inner tube is not higher than the discharge port of valve B (10) by adjusting valve A (9).

10. The working method of a hydrogen iodide decomposition device according to claim 8, characterized in that, It also includes: Multiple devices are connected in parallel to realize the large-scale decomposition of hydrogen iodide.

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