Isothermal coiled tube methanol synthesis tower

Abstract

The utility model discloses an isothermal coiled tube methanol synthesis tower which comprises a shell pass cylinder and a collector, an upper seal head is arranged at the top end of the shell pass cylinder, a lower seal head is arranged at the bottom of the shell pass cylinder, the collector is arranged in the shell pass cylinder, a reaction gas inlet is formed in the side edge of the shell pass cylinder, and a radial distributor is connected to the reaction gas inlet. The radial distributor is simple in structure, safe and reliable, reaction gas can uniformly enter a catalyst layer to a collector after passing through the radial distributor, and the reaction gas inlet is formed in the side edge part of the shell pass cylinder, so that the path of the reaction gas in a large-scale or ultra-large-scale reactor is shortest, the pressure is reduced, and the service life of the reactor is prolonged. And reaction heat can also be uniformly released in the whole catalyst bed layer, so that efficient heat transfer is realized, and the synthesis efficiency of methanol is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of methanol preparation, and specifically relates to an isothermal pipe-wound methanol synthesis tower, which is suitable for various strongly exothermic reactions of catalytic synthesis such as hydrogenation of liquid carbon dioxide to produce methanol. Background Art

[0002] The technology of using renewable energy such as solar energy to produce green hydrogen and reacting it with CO2 to produce liquid sunlight methanol will become a feasible path for my country to achieve the "dual carbon" goals of carbon peak and carbon neutrality. "Liquid sunlight", namely clean methanol and green methanol, refers to methanol produced when carbon emissions are extremely low or zero during the production process. Methanol can be divided into five generations according to its source. The fifth generation synthesizes methanol from CO2 and water through artificial photosynthesis. In the fifth generation of methanol production, water is photolyzed by sunlight to produce hydrogen, and carbon dioxide in the air is hydrogenated to produce methanol. This process has zero pollution and zero emissions, and can form a cycle. It is one of the cleanest and most environmentally friendly ways for humans to produce methanol so far, and it is worth promoting vigorously. In the production process of liquid sunlight methanol, CO2 hydrogenation to produce methanol is one of the main processes. In the prior art, the air inlet of the synthesis tower used in the preparation of methanol is usually set at the end of the synthesis tower, which prolongs the path for the gas to enter the synthesis tower, prolongs the reaction time, and has low methanol synthesis efficiency, which is not conducive to practical use.

[0003] The existing patent document discloses a utility model patent of a methanol synthesis tower (Announcement No.: CN205948842U). The technical scheme thereof records a methanol synthesis tower, which comprises a shell-side shell (1a), a tube-side shell (1b), and upper and lower heads (2, 3) arranged at both ends of the tube-side shell (1b). A reaction gas inlet (4) is arranged on the upper head (2). The reaction gas inlet is arranged at the end of the synthesis tower. The above-mentioned problem also exists. The path for the gas to enter the synthesis tower is long, the reaction time is long, and the methanol synthesis efficiency is low. Utility Model Content

[0004] The utility model aims to provide a technical solution for an isothermal coiled-tube methanol synthesis tower in view of the deficiencies in the prior art. The utility model has a simple, safe and reliable structure. The reaction gas enters the catalyst layer to the collector evenly after passing through a radial distributor. The reaction gas inlet is arranged on the side of the shell-side cylinder, so that the distance traveled by the reaction gas in a large or super-large reactor is the shortest, thereby reducing the pressure and allowing the reaction heat to be evenly released in the entire catalyst bed, thereby achieving efficient heat transfer and improving the synthesis efficiency of methanol.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] The isothermal coiled-tube methanol synthesis tower comprises a shell-side cylinder and a collector. The top of the shell-side cylinder is provided with an upper head, the bottom of the shell-side cylinder is provided with a lower head, the collector is provided in the shell-side cylinder, the side of the shell-side cylinder is provided with a reaction gas inlet, and the reaction gas inlet is connected to a radial distributor. The reaction gas inlet is provided at the side of the shell-side cylinder, which optimizes the path of the reaction gas entering the shell-side cylinder, which can indirectly improve the reaction time and accelerate the preparation efficiency of methanol. The upper and lower heads are provided to ensure the overall sealing and structural stability of the synthesis tower. The collector is convenient for collecting the methanol generated during the reaction process, which is convenient for subsequent separation and purification. The radial distributor can ensure that the reaction gas enters the reaction area evenly and stably, avoiding the problems of local overheating or uneven reaction.

[0007] Furthermore, a baffle is provided between the reaction gas inlet and the radial distributor. The radial distributor combined with the baffle can ensure that the reaction gas is evenly distributed in the shell-side cylinder.

[0008] Furthermore, the bottom of the shell-side cylinder is provided with a tube box cylinder 1 and a tube box cylinder 2, the tube box cylinder 1 includes a tube sheet 1 and a tube box head 1, the tube box head 1 is provided with an inlet 1, the tube box cylinder 2 includes a tube sheet 2 and a tube box head 2, the tube box head 2 is provided with an inlet 2, and the shell-side cylinder is provided with an outlet 1 and an outlet 2. The tube sheet 1 and the tube sheet 2 strengthen the structural strength, the tube box cylinder 1 and the tube box cylinder 2 are provided with an inlet 1 and an inlet 2 respectively, and the multi-inlet design allows different types of fluids to enter the reactor, increasing the flexibility and diversity of the process.

[0009] Furthermore, the outer periphery of the collector is spirally wound with heat exchange tube 1 and heat exchange tube 2. Catalyst is installed between the heat exchange tube and the shell cylinder. Heat exchange tube 1 and heat exchange tube 2 are wound on the collector, which saves space and facilitates them to fully exchange heat with the reaction gas, realize a smaller temperature difference range in the synthesis tower, transfer heat in time, maintain the temperature stability of the catalyst bed, and realize an isothermal environment.

[0010] Further, one end of the heat exchange tube 1 is connected to the inlet 1, the other end of the heat exchange tube is connected to the outlet 1, one end of the heat exchange tube 2 is connected to the inlet 2, and the other end of the heat exchange tube 2 is connected to the outlet 2. Cold fluid 1 enters through the inlet 1 and flows out through the outlet 1, cold fluid 2 enters through the inlet 2 and flows out through the outlet 2, and the inlet 1 and the inlet 2 are respectively connected to the heat exchange tube 1 and the heat exchange tube 2, allowing the cooling medium to flow through, achieving heat absorption, which helps to save energy and optimize the thermal efficiency of the system.

[0011] Furthermore, a pipe clamp is provided on the collector, and the heat exchange tube 1 and the heat exchange tube 2 are connected to the collector shell through the pipe clamp. As a connecting piece, the pipe clamp can ensure the tight connection between the heat exchange tube 1, the heat exchange tube 2 and the collector shell, and prevent the heat exchange tube 1 and the heat exchange tube 2 from accidentally falling off during the operation of the equipment.

[0012] Furthermore, a gasket is provided between the pipe clamp and the collector, which can play a certain buffering role, reduce the stress concentration caused by pipeline vibration or thermal expansion and contraction, and enhance the stability of the heat exchange tube 1 and the heat exchange tube 2 in the collector.

[0013] Furthermore, a manhole is provided on the upper head, and a discharge port is provided on the lower head. The manhole is provided on the upper head, making the maintenance work more convenient, and the discharge port is located at the lower head, which facilitates the unloading of materials for subsequent centralized processing.

[0014] Furthermore, a support plate is provided in the shell-side cylinder, the top end of the collector passes through the support plate and extends to the upper head, and the bottom end of the collector passes through the support plate and extends to the outside of the lower head, forming an extension section, and a reaction gas outlet is provided on the extension section. The support plate plays a key supporting role in the shell-side cylinder, preventing the collector from being displaced or damaged due to fluid impact or vibration during operation, and the setting of the reaction gas outlet helps to discharge the gas generated during the reaction process in a timely manner.

[0015] Furthermore, a stopper is provided on the inner wall of the shell-side cylinder, a slot is formed between the stopper and the shell-side cylinder, the end of the radial distributor is matched with the slot, and the stopper is an L-shaped structure. The end of the radial distributor is connected and fixed to the shell-side cylinder, and the stopper has a certain supporting effect, which can enhance the stability of the end structure of the radial distributor and enhance the tightness of the connection between the radial distributor and the shell-side cylinder.

[0016] The utility model has the following beneficial effects due to the adoption of the above technical solution:

[0017] By setting a reaction gas inlet on the side and a baffle between the reaction gas inlet and the radial distributor, the reaction gas is disrupted so that the reaction gas enters the catalyst layer and the collector evenly from the radial distributor, making the distance traveled by the reaction gas in a large or ultra-large reactor as short as possible, thereby reducing the pressure and allowing the reaction heat to be evenly released in the entire catalyst bed, achieving efficient heat transfer and ensuring an isothermal effect.

[0018] By setting the optimal number of windings in each layer and the layout of the pipes, the radial and axial temperature difference of the catalyst layer is small and the temperature distribution is ideal. The heat is removed efficiently and synchronously using uniform reaction heat, which can better promote the reaction itself and improve the synthesis efficiency.

[0019] The structure is simple, safe and reliable. The coiled tube can eliminate thermal stress by itself. At the same time, compared with other structures, the coiled tube heat exchange area per unit volume can be maximized, heat transfer is efficient, the catalyst layer temperature is stabilized, and the life of the catalyst is further extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described below in conjunction with the accompanying drawings:

[0021] Figure 1 This is a schematic diagram of the structure of the first embodiment of the utility model;

[0022] Figure 2 for Figure 1 Schematic diagram of the structure of the collector;

[0023] Figure 3 This is a schematic diagram of the structure of the second embodiment of the present utility model;

[0024] Figure 4 for Figure 3 Schematic diagram of the enlarged structure at point A in the middle.

[0025] In the figure: 1-shell cylinder; 2-upper head; 3-lower head; 4-collector; 5-reaction air inlet; 6-radial distributor; 7-heat exchange tube 1; 8-heat exchange tube 2; 9-tube box cylinder 1; 10-tube box cylinder 2; 11-tube box head 1; 12-tube box head 2; 13-inlet 1; 14-inlet 2; 15-pipe clamp; 16-gasket; 18-support plate; 19-extension section; 20-blocker; 21-manhole; 22-discharge port; 23-reaction gas outlet; 24-tube sheet 1; 25-tube sheet 2; 26-outlet 1; 27-outlet 2; 28-air outlet. DETAILED DESCRIPTION

[0026] like Figure 1 and Figure 2 As shown, it is the first embodiment of the utility model, including a shell-side cylinder 1 and a collector 4. The top of the shell-side cylinder 1 is provided with an upper head 2, the bottom of the shell-side cylinder 1 is provided with a lower head 3, the collector 4 is arranged in the shell-side cylinder 1, and the side of the shell-side cylinder 1 is provided with a reaction gas inlet 5, and the reaction gas inlet 5 is connected with a radial distributor 6. The reaction gas inlet 5 is arranged in the middle part of the shell-side cylinder 1, which optimizes the path of the reaction gas entering the shell-side cylinder 1, can indirectly improve the reaction time, and accelerate the preparation efficiency of methanol. The arrangement of the upper head 2 and the lower head 3 ensures the overall sealing and structural stability of the synthesis tower. The collector 4 is convenient for collecting the methanol generated during the reaction process, which is convenient for subsequent separation and purification. The radial distributor 6 can ensure that the reaction gas enters the reaction area evenly and stably, avoiding the problem of local overheating or uneven reaction.

[0027] A baffle 17 is provided between the reaction gas inlet 5 and the radial distributor 6. The baffle 17 will disrupt the reaction gas, and the radial distributor 6 is provided with an outlet hole 28. The disrupted reaction gas will flow into the shell-side cylinder 1 from the outlet hole 28. The radial distributor 6 combined with the baffle 17 can ensure that the reaction gas is evenly distributed in the shell-side cylinder 1, reduce the phenomenon of local over-concentration or over-leanness, facilitate the reactants to fully contact and react, and improve the reaction efficiency and conversion rate.

[0028] The bottom of the shell-side cylinder 1 is provided with a tube box cylinder 1 9 and a tube box cylinder 2 10. The tube box cylinder 1 9 includes a tube sheet 1 24 and a tube box head 1 11. The tube box head 1 11 is provided with an inlet 13. The tube box cylinder 2 10 includes a tube sheet 2 25 and a tube box head 2 12. The tube box head 2 12 is provided with an inlet 2 14. The shell-side cylinder 1 is provided with an outlet 1 26 and an outlet 2 27. The tube sheet 1 24 and the tube sheet 2 25 improve the structural strength. The tube box cylinder 1 9 and the tube box cylinder 2 10 are provided with an inlet 13 and an inlet 2 14 respectively. The multi-inlet design allows different types of cold fluids to enter the reactor, increasing the flexibility and diversity of the process. The setting of the tube box cylinder and its head is not only used for the inlet and outlet of the fluid, but also has a certain support and reinforcement effect on the shell-side cylinder 1, improving the structural strength and stability of the entire reactor. The outlet 1 26 and the outlet 2 27 facilitate the outflow of the cold fluid.

[0029] The outer periphery of the collector 4 is spirally wound with heat exchange tube 1 7 and heat exchange tube 2 8. Heat exchange tube 1 7 and heat exchange tube 2 8 are wound on the collector 4, making the structure of the entire synthesis tower more compact, saving space, and facilitating them to fully exchange heat with the reaction gas. By reasonably setting the heat exchange tube design, a smaller temperature difference range in the synthesis tower can be achieved, which helps to remove the heat generated during the reaction process in time, maintain the temperature stability of the catalyst bed, and achieve an isothermal environment, which helps to reduce the adverse effects of temperature fluctuations on the methanol synthesis reaction rate and selectivity, thereby improving the yield and purity of methanol. Catalysts are installed between heat exchange tube 1 7 and heat exchange tube 2 8 and the shell cylinder 1.

[0030] One end of heat exchange tube 17 is connected to inlet 13, the other end of heat exchange tube 17 is connected to outlet 126, one end of heat exchange tube 28 is connected to inlet 214, the other end of heat exchange tube 28 is connected to outlet 27. Cold fluid 1 enters through inlet 13 and flows out through outlet 26, cold fluid 2 enters through inlet 214 and flows out through outlet 27, inlet 13 and inlet 214 are connected to heat exchange tube 17 and heat exchange tube 28 respectively, allowing cooling medium to flow through, absorbing heat, helping to save energy and optimize system thermal efficiency.

[0031] The collector 4 is provided with a pipe clamp 15, and the heat exchange tube 1 7 and the heat exchange tube 2 8 are connected to the outer shell of the collector 4 through the pipe clamp 15. As a connecting piece, the pipe clamp 15 can ensure the tight connection between the heat exchange tube 1 7, the heat exchange tube 2 8 and the outer shell of the collector 4, prevent fluid leakage, and improve the stability of the overall structure. The tightening effect of the pipe clamp 15 can effectively prevent the heat exchange tube 1 7 and the heat exchange tube 2 8 from accidentally falling off during the operation of the equipment, thereby avoiding possible safety accidents and improving safety.

[0032] A gasket 16 is provided between the pipe clamp 15 and the collector 4. The existence of the gasket 16 can play a certain buffering role, reduce the stress concentration caused by pipeline vibration or thermal expansion and contraction, protect the heat exchange tube 1 7, the heat exchange tube 2 8 and the pipe clamp 15 from damage, and at the same time enhance the stability of the heat exchange tube 1 7 and the heat exchange tube 2 8 on the collector 4, help maintain the spacing and arrangement neatness between the heat exchange tube 1 7 and the heat exchange tube 2 8, thereby improving the heat exchange efficiency.

[0033] A manhole 21 is provided on the upper head 2, and a discharge port 22 is provided on the lower head 3. The manhole 21 is provided on the upper head 2, so that maintenance work is more convenient and key components and areas inside the container can be directly contacted. The discharge port 22 is located at the lower head 3, which is convenient for the material to flow out naturally under the action of gravity, realizing a fast and accurate unloading process. Cold fluid 1 flows in from inlet 13, flows out to outlet 26 through heat exchange tube 17, and cold fluid 2 flows in from inlet 14, flows out to outlet 27 through heat exchange tube 28, realizing efficient heat exchange.

[0034] A support plate 18 is provided in the shell-side cylinder 1, and the top end of the collector 4 extends through the support plate 18 to the upper head 2, and the bottom end of the collector 4 extends through the support plate 18 to the outside of the lower head 3, forming an extension section 19, and a reaction gas outlet 23 is provided on the extension section 19. The support plate 18 plays a key supporting role in the shell-side cylinder 1, preventing the collector 4 from being displaced or damaged due to fluid impact or vibration during operation, and can also improve the overall strength and rigidity of the shell-side cylinder 1, so that it can withstand higher working pressure and temperature fluctuations. The setting of the reaction gas outlet 23 helps to discharge the gas generated during the reaction process in time, and avoids the accumulation of gas in the container to cause pressure increase or safety hazards.

[0035] like Figure 3 and Figure 4 As shown, it is the second embodiment of the utility model. On the basis of the above-mentioned first embodiment, the interior of the shell-side cylinder 1 is improved, a stopper 20 is provided on the inner wall of the shell-side cylinder 1, a card slot (not marked in the figure) is formed between the stopper 20 and the shell-side cylinder 1, the end of the radial distributor 6 is matched and connected with the card slot, and the stopper 20 is an L-shaped structure. The stopper 20 has a certain supporting effect, which can enhance the stability of the end structure of the radial distributor 6, prevent deformation or damage caused by fluid impact or vibration, and enhance the tightness of the connection between the radial distributor 6 and the shell-side cylinder 1, avoid the loose connection between the radial distributor 6 and the shell-side cylinder 1, and the reaction gas flows away from the gap, thereby improving the efficiency of the reaction or heat exchange process. The end of the radial distributor 6 is matched and connected with the card slot, and the tightness of the connection is further improved.

[0036] Through the thermodynamic and kinetic modeling analysis of the CO2 hydrogenation reaction system, the structure of the conventional methanol synthesis tower is optimized, and then by reasonably setting the distance from the radial distributor 6 to the collector 4 and calculating a reasonable effective coil heat exchange area, a liquid sunlight isothermal axial radial coil methanol synthesis tower with low temperature difference, low pressure, high CO2 utilization rate and high methanol synthesis efficiency is provided.

[0037] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the present invention to achieve basically the same technical effects are all included in the protection scope of the present invention.

Claims

1. Isothermal coiled methanol synthesis tower, including: A shell-side cylinder, wherein an upper head is arranged at the top of the shell-side cylinder, and a lower head is arranged at the bottom of the shell-side cylinder; Collector; Features: A reaction gas inlet is arranged on the side of the shell-side cylinder, and a radial distributor is connected to the reaction gas inlet.

2. The isothermal coiled methanol synthesis tower according to claim 1, characterized in that: A baffle is arranged between the reaction gas inlet and the radial distributor.

3. The isothermal coiled methanol synthesis tower according to claim 1, characterized in that: The bottom of the shell-side cylinder is provided with a tube box cylinder body 1 and a tube box cylinder body 2, the tube box cylinder body 1 includes a tube sheet 1 and a tube box head 1, the tube box head 1 is provided with an inlet 1, the tube box cylinder body 2 includes a tube sheet 2 and a tube box head 2, the tube box head 2 is provided with an inlet 2, and the shell-side cylinder is provided with an outlet 1 and an outlet 2.

4. The isothermal coiled methanol synthesis tower according to claim 3, characterized in that: The outer spiral of the collector is provided with heat exchange tube 1 and heat exchange tube 2.

5. The isothermal coiled methanol synthesis tower according to claim 4, characterized in that: One end of the heat exchange tube 1 is connected to the inlet 1, and the other end of the heat exchange tube 1 is connected to the outlet 1. One end of the heat exchange tube 2 is connected to the inlet 2, and the other end of the heat exchange tube 2 is connected to the outlet 2.

6. The isothermal coiled methanol synthesis tower according to claim 4, characterized in that: The collector is provided with a pipe clamp, and the heat exchange tube 1 and the heat exchange tube 2 are both connected to the collector through the pipe clamp.

7. The isothermal coiled methanol synthesis tower according to claim 6, characterized in that: A gasket is arranged between the pipe clamp and the collector.

8. The isothermal coiled methanol synthesis tower according to claim 1, characterized in that: The upper sealing head is provided with a manhole, and the lower sealing head is provided with a discharge port.

9. The isothermal coiled methanol synthesis tower according to claim 1, characterized in that: A support plate is arranged in the shell cylinder, the top end of the collector extends through the support plate to the upper head, and the bottom end of the collector extends through the support plate to the outside of the lower head to form an extension section, and a reaction gas outlet is arranged on the extension section.

10. The isothermal coiled methanol synthesis tower according to claim 1, characterized in that: A stopper is arranged on the inner wall of the shell-side cylinder, a slot is formed between the stopper and the shell-side cylinder, the end of the radial distributor is matched and engaged with the slot, and the stopper is an L-shaped structure.

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