Multi-lift tube heat exchange type reformer

Abstract

The utility model discloses a kind of multi-rising pipe heat exchange type converter, it is related to chemical technology field, including heat exchange pipe outlet subassembly, equipment apron, furnace body being set on equipment apron, upper pipe box being set on the top of furnace body, two-stage conversion gas inlet being set on the bottom of furnace body, two-stage conversion gas outlet in the bottom of furnace body side wall, raw material gas inlet pipe being set on the side wall of upper pipe box and one-stage conversion gas outlet pipe being set on the top of upper pipe box;Upper pipe box top is provided with the through hole that is sealedly connected with the bottom of the outside wall of one-stage conversion gas outlet pipe;Heat exchange pipe outlet subassembly part is located in upper pipe box, part is located in lower furnace body;Heat exchange pipe outlet subassembly located in upper pipe box includes total gas outlet pipe partially extended into one-stage conversion gas outlet pipe;Multiple sealing assemblies are arranged between total gas outlet pipe and one-stage conversion gas outlet pipe.The multiple sealing assemblies of the utility model avoid that raw material gas of pipe box mixes into outlet gas, and can also compensate the vertical expansion of total gas outlet pipe.

Description

Technical Field

[0001] This utility model relates to the field of chemical technology, and more specifically to the field of multi-riser tube heat exchanger converter technology. Background Technology

[0002] A heat exchanger-type converter, which utilizes the high-temperature process gas heat from the outlet of a two-stage converter to provide heat for the first-stage conversion reaction, thus achieving methane steam reforming, has advantages such as small footprint and fuel saving. It is widely used in industries such as ammonia synthesis, methanol production, hydrogen production, and syngas preparation. Existing patents disclose the following technologies: Patent publication number CN203764233U, entitled "Multi-center Tube Heat Exchanger Converter," discloses the following: A multi-center tube heat exchanger converter includes a furnace body mounted on a skirt support and an upper tube box connected to the upper part of the furnace body. A raw material gas inlet is located at the upper part of the upper tube box, and two-stage conversion gas inlets are located at the lower part of the furnace body. The furnace body employs a multi-center tube structure design, a sleeve-type structure design, and a free expansion structure design at the lower end of the conversion tubes. This utility model is applicable to natural gas heat exchanger-type natural gas conversion technology in large-scale ammonia plants, hydrogen production, and syngas preparation. By recovering the high-temperature waste heat of 600-1000℃ from the outlet gas of the second-stage converter as the heat source required for the first-stage conversion, it significantly reduces natural gas consumption. The adjustment of the resource structure of electricity and gas consumption reduces the production cost of the device. Simultaneously, the device significantly reduces flue gas emissions, lowering the amount of CO2 and NOx emitted into the atmosphere. Under the condition of no increase in raw materials, it increases output and improves the economic efficiency of the device.

[0003] In the aforementioned patent, in the heat exchanger converter, the high-temperature secondary conversion gas flows from bottom to top, while the raw material gas flows from top to bottom inside the conversion tube. After heat exchange, the temperature of the conversion gas inside the furnace tube rises to approximately 700°C before being sent to the top of the secondary converter for further deep conversion. To save on the high-temperature connecting pipes between the heat exchanger converter and the secondary converter, the conversion gas at the furnace tube outlet needs to flow through an ascent pipe to the top of the heat exchanger converter. In the past, small and medium-sized heat exchanger converters only had one ascent pipe. If they were to be scaled up, problems such as uneven gas flow, difficulty in manufacturing large-diameter high-temperature alloy pipes, and high pipe costs would arise. Utility Model Content

[0004] The purpose of this utility model is to provide a multi-riser tube heat exchanger converter in order to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, this utility model specifically adopts the following technical solution: This utility model provides a multi-riser tube heat exchanger converter, including a heat exchange tube outlet assembly, an equipment skirt, a furnace body mounted on the equipment skirt, an upper tube box mounted on the top of the furnace body, two-stage conversion gas inlets mounted on the bottom of the furnace body and communicating with the interior of the furnace body, two-stage conversion gas outlets mounted on the bottom of the side wall of the furnace body and communicating with the interior of the furnace body, a raw material gas inlet pipe mounted on the side wall of the upper tube box, and a conversion gas outlet pipe mounted on the top of the upper tube box. A through hole is provided at the top of the upper pipe box, and the bottom of the outer wall of a section of the converter gas outlet pipe is sealed to the top of the inner wall of the through hole by welding. The heat exchanger tube outlet assembly is located inside the upper tube box, and the heat exchanger tube outlet assembly is located inside the furnace body; the heat exchanger tube outlet assembly located inside the upper tube box includes a main gas outlet pipe that extends into a section of the conversion gas outlet pipe. A multi-stage sealing assembly is installed between the main exhaust pipe and a section of the converter gas outlet pipe.

[0006] In one embodiment, the multi-stage sealing assembly is a two-stage sealing assembly, which includes an upper primary axial sealing assembly and a lower secondary axial sealing assembly.

[0007] In one embodiment, the primary axial sealing assembly is a high-temperature flexible graphite packing box disposed between the main exhaust pipe and a section of the conversion gas outlet pipe.

[0008] Specifically, a high-temperature flexible graphite packing box is installed between the main gas outlet pipe and the first section of the converter gas outlet pipe. This allows the octopus-shaped main pipe to expand freely up and down while providing a reliable seal to prevent the raw material gas in the converter tube box from flowing back into the outlet pipe.

[0009] In one embodiment, the secondary axial sealing assembly includes a mounting base welded to the outer wall of the main vent pipe, a radial sealing sleeve sleeved on the main vent pipe located above the mounting base, and an annular arc-shaped elastic plate disposed at the bottom of the radial sealing sleeve; the bottom of the annular arc-shaped elastic plate has a gap or contact with the mounting base, and the top of the radial sealing sleeve is in contact with a high-temperature flexible graphite packing box.

[0010] Specifically, the radial sealing sleeve utilizes the displacement generated by the vertical expansion of the main vent pipe to achieve axial radial sealing.

[0011] In one embodiment, the mounting base is an annular support platform, and an annular limiting plate is provided on the upper surface of the annular support platform. The axis of the annular limiting plate coincides with the axis of the main air outlet pipe.

[0012] In one embodiment, the annular arc-shaped elastic plate comprises multiple layers of elastic plates stacked together, with the orthographic projection of all the elastic plates located on an annular support platform inside the annular limiting plate.

[0013] In one embodiment, a sealing partition plate is provided between the upper tube box and the furnace body; The heat exchange tube outlet assembly includes an octopus-shaped main pipe installed inside the upper tube box and connected to the bottom of the main exhaust pipe. The octopus-shaped main pipe is a horizontally arranged annular pipe with several rising pipes evenly distributed around its circumference. The bottom of each rising pipe passes through a sealing partition plate and enters the furnace body.

[0014] In one embodiment, the heat exchange tube outlet assembly also includes several conversion tubes disposed inside the furnace body. The top of each conversion tube is connected to the inside of the upper tube box through a sealing partition plate, and the conversion tubes and the riser tubes do not interfere with each other. The number of riser tubes is less than or equal to the number of conversion tubes.

[0015] In one embodiment, the number of riser tubes is the same as the number of conversion tubes, and the corresponding riser tubes and conversion tubes located inside the furnace are connected by a spiral pigtail tube.

[0016] In one implementation, the number of riser tubes is 19 to 37.

[0017] Specifically, multiple riser pipes (19-37) are installed inside the furnace. Each riser pipe is only responsible for collecting a small amount of gas from the outlet of the conversion pipe, which greatly improves the uniformity of gas flow.

[0018] Working principle: The raw material gas enters the upper tube box from the raw material gas inlet, then enters the conversion tube, and after passing through the conversion tube, it converges into multiple (19-37) riser tubes. These multiple (19-37) riser tubes then converge into the octopus-shaped main pipe, and leave the heat exchanger converter from the main outlet pipe. To prevent the raw material gas from the tube box from mixing with the outlet gas, a high-temperature flexible graphite packing box is installed at the main outlet pipe. This high-temperature flexible graphite packing box can both isolate the raw material gas and the outlet gas from mixing and compensate for the vertical expansion of the octopus-shaped main pipe.

[0019] The secondary conversion gas enters the shell side of the furnace body through the secondary conversion gas inlet. The high-temperature secondary conversion gas flows through the outside of the conversion tube, providing heat for the conversion reaction inside the conversion tube. The secondary conversion gas, after its temperature decreases, is discharged from the heat exchanger converter through the secondary conversion gas outlet.

[0020] The beneficial effects of this utility model are as follows: 1. The present invention is reasonably designed. In order to prevent the raw material gas of the pipe box from mixing with the outlet gas, a high-temperature flexible graphite packing box is provided at the main outlet pipe. The high-temperature flexible graphite packing box can not only isolate the mixing of the raw material gas and the outlet gas, but also compensate for the vertical expansion of the main outlet pipe.

[0021] 2. The radial sealing sleeve utilizes the displacement generated by the vertical expansion of the main vent pipe to achieve axial radial sealing. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of a multi-stage sealing assembly; Figure 3 This is a schematic diagram of the spiral pig tail tube. Reference numerals: 1. Conversion tube; 2. Ascendant tube; 3. Octopus manifold; 4. High-temperature flexible graphite packing box. Detailed Implementation

[0024] To make the technical problems, technical solutions, and technical effects of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] Example 1 like Figures 1 to 3 As shown, this embodiment provides a multi-riser-tube heat exchanger converter, including a heat exchange tube outlet assembly, an equipment skirt, a furnace body mounted on the equipment skirt, an upper tube box mounted on the top of the furnace body, and a two-stage conversion gas inlet mounted on the bottom of the furnace body and communicating with the interior of the furnace body. Figure 1 (at point C in the middle), the two-stage conversion gas outlets connected to the interior of the furnace body at the bottom of the side wall of the furnace body ( Figure 1 (at point D in the middle), the raw material gas inlet pipe installed on the side wall of the upper pipe box ( Figure 1 (at point A in the middle) and a section of the converter gas outlet pipe located at the top of the upper pipe box ( Figure 1 (Center B) A through hole is provided at the top of the upper pipe box, and the bottom of the outer wall of a section of the converter gas outlet pipe is sealed to the top of the inner wall of the through hole by welding. The heat exchanger tube outlet assembly is located inside the upper tube box, and the heat exchanger tube outlet assembly is located inside the furnace body; the heat exchanger tube outlet assembly located inside the upper tube box includes a main gas outlet pipe that extends into a section of the conversion gas outlet pipe. A multi-stage sealing assembly is installed between the main exhaust pipe and a section of the converter gas outlet pipe.

[0029] Example 2 like Figures 1 to 3 As shown, this embodiment provides a multi-riser tube 2 heat exchanger converter, including a heat exchange tube outlet assembly, an equipment skirt, a furnace body mounted on the equipment skirt, an upper tube box mounted on the top of the furnace body, and a two-stage converter inlet mounted on the bottom of the furnace body and communicating with the interior of the furnace body. Figure 1 (at point C in the middle), the two-stage conversion gas outlets connected to the interior of the furnace body at the bottom of the side wall of the furnace body ( Figure 1 (at point D in the middle), the raw material gas inlet pipe installed on the side wall of the upper pipe box ( Figure 1 (at point A in the middle) and a section of the converter gas outlet pipe located at the top of the upper pipe box ( Figure 1 (Center B) A through hole is provided at the top of the upper pipe box, and the bottom of the outer wall of a section of the converter gas outlet pipe is sealed to the top of the inner wall of the through hole by welding. The heat exchanger tube outlet assembly is located inside the upper tube box, and the heat exchanger tube outlet assembly is located inside the furnace body; the heat exchanger tube outlet assembly located inside the upper tube box includes a main gas outlet pipe that extends into a section of the conversion gas outlet pipe. A multi-stage sealing assembly is installed between the main exhaust pipe and a section of the converter gas outlet pipe.

[0030] The multi-stage sealing assembly is a two-stage sealing assembly, which includes an upper primary axial sealing assembly and a lower secondary axial sealing assembly.

[0031] The primary axial sealing assembly is a high-temperature flexible graphite packing box 4 installed between the main exhaust pipe and a section of the conversion gas outlet pipe.

[0032] Specifically, a high-temperature flexible graphite packing box 4 is installed between the main gas outlet pipe and the section of the converter gas outlet pipe. This allows the octopus-shaped main pipe 3 to expand freely up and down, and provides a reliable seal to prevent the raw material gas in the converter tube box from flowing back into the outlet pipe.

[0033] Example 3 This embodiment is a further optimization based on embodiment 2, as detailed below: The secondary axial sealing assembly includes a mounting base welded to the outer wall of the main vent pipe, a radial sealing sleeve fitted on the main vent pipe located above the mounting base, and an annular arc-shaped elastic plate disposed at the bottom of the radial sealing sleeve; the bottom of the annular arc-shaped elastic plate has a gap or contact with the mounting base, and the top of the radial sealing sleeve is in contact with the high-temperature flexible graphite packing box 4.

[0034] Specifically, the radial sealing sleeve utilizes the displacement generated by the vertical expansion of the main vent pipe to achieve axial radial sealing.

[0035] Example 4 This embodiment is a further optimization based on embodiment 3, as detailed below: The mounting base is a ring-shaped support platform, and a ring-shaped limiting plate is provided on the upper surface of the ring-shaped support platform. The axis of the ring-shaped limiting plate coincides with the axis of the main air outlet pipe.

[0036] The annular arc-shaped elastic plate consists of multiple layers of elastic plates stacked together, with the orthographic projection of all the elastic plates located on the annular support platform inside the annular limiting plate.

[0037] A sealing partition plate is installed between the upper tube box and the furnace body; The heat exchange tube outlet assembly includes an octopus-shaped main pipe 3 installed inside the upper tube box and connected to the bottom of the main exhaust pipe. The octopus-shaped main pipe 3 is a horizontally arranged annular pipe. Several rising pipes 2 are evenly distributed around the octopus-shaped main pipe 3, and the bottom of each rising pipe 2 passes through a sealing partition plate and enters the furnace body.

[0038] The heat exchange tube outlet assembly also includes several conversion tubes 1 installed inside the furnace body. The top of each conversion tube 1 is connected to the inside of the upper tube box through a sealing partition plate. The conversion tube 1 and the riser tube 2 do not interfere with each other. The number of riser tubes 2 is less than or equal to the number of conversion tubes 1.

[0039] Example 5 This embodiment is a further optimization based on embodiment 4, as detailed below: The number of riser pipes 2 is the same as the number of conversion pipes 1, and the corresponding riser pipes 2 and conversion pipes 1 located inside the furnace are connected by a spiral pig tail pipe.

[0040] The number of riser tubes 2 is 19 to 37.

[0041] Specifically, multiple riser pipes 2 (19 to 37) are installed inside the furnace. Each riser pipe 2 is only responsible for the gas collection of a small amount of the outlet of the conversion pipe 1, which greatly improves the uniformity of gas flow.

[0042] Working principle: The raw material gas enters the upper tube box from the raw material gas inlet, then enters the conversion tube 1, and after passing through the conversion tube 1, it converges into multiple (19~37) riser tubes 2. The multiple (19~37) riser tubes 2 then converge into the octopus-shaped main pipe 3, and leave the heat exchanger converter from the main outlet pipe. To prevent the raw material gas from the tube box from mixing with the outlet gas, a high-temperature flexible graphite packing box 4 is installed at the main outlet pipe. This high-temperature flexible graphite packing box 4 can isolate the mixing of the raw material gas and the outlet gas, and at the same time compensate for the vertical expansion of the octopus-shaped main pipe 3.

[0043] The second-stage conversion gas enters the shell side of the furnace body from the inlet of the second-stage converter. The high-temperature second-stage conversion gas flows through the outside of the conversion tube 1 to provide heat for the conversion reaction inside the conversion tube 1. The second-stage conversion gas, after its temperature is reduced, is discharged from the heat exchange converter through the outlet of the second-stage converter.

Claims

1. A multi-riser tube heat exchanger converter, characterized in that, It includes a heat exchange tube outlet assembly, an equipment skirt, a furnace body mounted on the equipment skirt, an upper tube box mounted on the top of the furnace body, a two-stage conversion gas inlet mounted on the bottom of the furnace body and communicating with the interior of the furnace body, a two-stage conversion gas outlet mounted on the bottom of the side wall of the furnace body and communicating with the interior of the furnace body, a raw material gas inlet pipe mounted on the side wall of the upper tube box, and a first-stage conversion gas outlet pipe mounted on the top of the upper tube box. The top of the upper pipe box is provided with a through hole, and the bottom of the outer wall of the first section of the converted gas outlet pipe is sealed to the top of the inner wall of the through hole by welding. The heat exchange tube outlet assembly is located inside the upper tube box, and the heat exchange tube outlet assembly is located inside the furnace body; the heat exchange tube outlet assembly located inside the upper tube box includes a main gas outlet pipe that extends into the section of the conversion gas outlet pipe. A multi-stage sealing assembly is provided between the main gas outlet pipe and the section of the converter gas outlet pipe.

2. The multi-riser tube heat exchanger converter according to claim 1, characterized in that, The multi-stage sealing assembly is a two-stage sealing assembly, which includes an upper primary axial sealing assembly and a lower secondary axial sealing assembly.

3. The multi-riser tube heat exchanger converter according to claim 2, characterized in that, The The primary axial sealing assembly is a high-temperature flexible graphite packing box (4) disposed between the main outlet pipe and the first section of the conversion gas outlet pipe.

4. A multi-riser tube heat exchanger converter according to claim 3, characterized in that, The secondary axial sealing assembly includes a mounting base welded to the outer wall of the main vent pipe, a radial sealing sleeve sleeved on the main vent pipe located above the mounting base, and an annular arc-shaped elastic plate disposed at the bottom of the radial sealing sleeve; the bottom of the annular arc-shaped elastic plate has a gap or contact with the mounting base, and the top of the radial sealing sleeve is in contact with the high-temperature flexible graphite packing box (4).

5. A multi-riser tube heat exchanger converter according to claim 4, characterized in that, The mounting base is an annular support platform, and an annular limiting plate is provided on the upper surface of the annular support platform. The axis of the annular limiting plate coincides with the axis of the main air outlet pipe.

6. A multi-riser tube heat exchanger converter according to claim 5, characterized in that, The annular arc-shaped elastic plate comprises multiple layers of elastic plates stacked together, and the orthographic projection of all the elastic plates is located on the annular support platform inside the annular limiting plate.

7. A multi-riser tube heat exchanger converter according to claim 3, characterized in that, A sealing partition plate is provided between the upper tube box and the furnace body; The heat exchange tube outlet assembly includes an octopus-shaped main pipe (3) disposed in the upper tube box and connected to the bottom of the main exhaust pipe. The octopus-shaped main pipe (3) is a horizontally arranged annular pipe. Several rising pipes (2) are evenly distributed around the octopus-shaped main pipe (3). The bottom of each rising pipe (2) passes through the sealing partition plate and enters the furnace body.

8. A multi-riser tube heat exchanger converter according to claim 7, characterized in that, The heat exchange tube outlet assembly also includes several conversion tubes (1) disposed in the furnace body. The top of each conversion tube (1) is connected to the interior of the upper tube box through the sealing partition plate. The conversion tubes (1) and the riser tubes (2) do not interfere with each other. The number of riser tubes (2) is less than or equal to the number of conversion tubes (1).

9. A multi-riser tube heat exchanger converter according to claim 8, characterized in that, The number of riser pipes (2) is the same as the number of conversion pipes (1), and the corresponding riser pipes (2) and conversion pipes (1) located in the furnace body are connected by a spiral pig tail pipe.

10. A multi-riser tube heat exchanger converter according to claim 9, characterized in that, The number of riser tubes (2) is 19 to 37.

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