Tandem pipe reactor with jacket water-air cooling pipe row

Abstract

The utility model relates to the technical field of petrochemical equipment, in particular to a serial pipe reactor with jacket water-air cooling pipe rows, which comprises a plurality of straight sleeves, a plurality of bent pipes and jacket communicating pipes, each straight sleeve comprises an inner pipe and an outer pipe, and the inner pipe is arranged in the outer pipe in a penetrating manner to form an annular straight jacket runner; and the inner pipes of the plurality of straight sleeves are connected in series through a bent pipe to form a medium flow channel for conveying and reacting reaction materials. The straight jacket flow channel is divided into upper jacket sections and lower jacket sections, the upper jacket sections are connected in series through jacket communicating pipes to form the upper jacket flow channel, the lower jacket sections are connected in series through jacket communicating pipes to form the lower jacket flow channel, and cooling water flows in the upper jacket flow channel and the lower jacket flow channel independently and circularly; and the upper jacket flow channel and / or the lower jacket flow channel are / is connected with an air cooler, so that a self-cooled upper half jacket water circulation system and / or a self-cooled lower half jacket water circulation system are / is formed. Water resources can be saved, the energy-saving and environment-friendly requirements are met, and the operation cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of petrochemical equipment, and particularly relates to a string tube reactor with a jacket water air-cooled tube row. Background Art

[0002] In the prior art, polyolefins (such as polypropylene and polyethylene) are the varieties with the largest output and consumption in general synthetic resins. The common production technologies of polyolefins usually include three types: slurry process, gas phase process and solution process. The so-called slurry process (Slurry Process), also known as slurry method or solvent process, is the earliest process technology used for producing polypropylene in the world. The slurry process technology is the main method for producing HDPE. The production process is as follows: propylene or ethylene is mixed with a hydrocarbon solvent, and the produced polymer is suspended in the solvent. The industrial application time of the slurry process is earlier, the process technology is mature, and the pressure and temperature are lower during the production process. According to the reactor form, the reaction equipment used in the slurry process can be divided into two types: stirred tank reactor and string tube reactor.

[0003] In the prior art, a general string tube reactor includes several straight sleeve tubes set according to production capacity, as well as corresponding jacket connecting pipes, elbows, mounting supports, connecting beams, etc. The straight sleeve tube includes an inner tube and an outer tube. The end of the elbow is connected in series with the end of the inner tube in sequence to form a connecting flow channel for the transportation and reaction of reaction materials. Since heat is generated during the polymerization reaction, a jacket flow channel is formed between the inner tube and the outer tube of the straight sleeve tube. The jacket connecting pipe is connected to the outer tube to connect the jacket flow channels into a connecting flow channel for transporting the cooling medium. The reaction heat is carried away by the cooling medium in the jacket flow channel. A corrugated expansion joint, a mounting support and a support beam seat are arranged on the outer tube of the straight sleeve tube. The connecting beam is connected to the support beam seat by bolts to combine the straight sleeve tubes into a three-dimensional framework. Since the string tube reactor is supported by multiple bases, that is, each straight sleeve tube is provided with a corresponding mounting support, errors in the length, axial position, orientation, elevation, spacing, etc. of the straight sleeve tubes, as well as many factors such as the parallelism of the straight sleeve tubes, the perpendicularity of the flanges, and the manufacturing errors of the elbows, will all affect the installation and sealing performance of the loop tube at the same time; and the string tube reactor is made of low-temperature steel, and has high requirements for manufacturing, welding and heat treatment. In order to make the material flow smoothly in the straight sleeve tube, the inner wall of the inner tube must be polished and polished many times to be close to the mirror surface to prevent the reactants from sticking to the wall and causing explosive polymerization.

[0004] For example, the structure of a string tube reactor for producing 300,000 tons / year of polypropylene is as Figure 1As shown in the figure, it is mainly composed of six straight sleeves (the first straight sleeve R1, the second straight sleeve R2, the third straight sleeve R3, the fourth straight sleeve R4, the fifth straight sleeve R5, and the sixth straight sleeve R6) each with a length of 50m and an outer diameter of φ609.6×16mm, five 180° large elbows (the first elbow A1, the second elbow A2, the third elbow A3, and two elbows at the bottom), and a 90° elbow connected in sequence to form a circular whole. And through five outer elbows connected to the outer pipe at the inner elbows, it is located on a relatively high platform foundation. An axial flow pump is provided at the inner elbow at the bottom of the string of pipes. The reaction material enters the string reactor from the reaction material inlet 1A, is stirred and circulated in the pipe under the drive of the axial flow pump, and reacts to form polypropylene in slurry form under the action of the catalyst, and is discharged from the reaction material outlet 1B into the pelletizing system; the cooling medium enters from the cooling medium inlet of the jacket flow channel and flows out from the cooling medium outlet of the jacket flow channel. Six mounting supports are located at the lower parts of the straight sleeves R1, R2, R3, R4, R5, and R6. There are five jacket connecting pipes connecting the jackets to each other. The cooling water in the jacket takes away the heat released by the reaction in the inner pipe through the partition wall to maintain the normal operation of the reaction process. This string reactor is located on a platform foundation 11m high, and the whole equipment weighs about 210 tons. In order to coordinate the difference in thermal expansion displacement caused by different temperatures between the inner pipe and the outer pipe, expansion joints are attached to the jacket; expansion joints, support beam seats and supports are also attached to the jacket. Adjacent jackets are connected by steel profiles to form eight space platforms.

[0005] With the shortage of petroleum resources, in order to meet the huge demand and development of the market for ethylene special materials, new and more stringent requirements have been put forward for the structure, production capacity and quality of the string reactor equipment. With the further expansion of the production capacity scale, the body structure of the string reactor in the above-mentioned existing technology is getting higher and higher, and the latitude of the location where the reactor is installed and operated is also getting higher and higher. Since the straight sleeves adopt an integral slender vertical structure, when these factors are combined, the following deficiencies will occur:

[0006] At present, the production capacity of a single polyethylene and polypropylene string reactor has been increased to 300,000 tons / year and 350,000 tons / year, and higher production capacity process technologies are under research and development. This large-scale competition method has faced two development bottlenecks. One is the transformation from the incremental market to the stock market, and the other is the energy conservation and environmental protection applicability of the original technology. Reflected in the main structural dimensions, the lengths of the jacketed straight pipes of polypropylene and polyethylene string reactors have been extended to more than 60 meters and 70 meters respectively, as Figure 2 shown in the schematic diagram of two straight sleeves, elbows and a jacket connecting pipe. The inner pipes of the two jacketed pipes are connected in series through the elbows at the top. The cooling water in the jacket is as Figure 2As shown by the solid arrows, the cooling water enters the jacket inlet C1, flows from one of the straight sleeves C4 from bottom to top, passes through the jacket connecting pipe C3 and flows into the jacket of another straight sleeve C5, and flows out from the jacket outlet C2. It can be seen that the cooling water's journey almost flows through the sum of the lengths of all the straight sleeves, and the height of the cooling water rise is equivalent to the overall height of the straight sleeves. Although the continued development of taller string reactors is beneficial to increasing the production capacity of the inner tube and the thoroughness of the reaction, the energy consumption of the jacket water is higher, and the increase in hydrostatic pressure leads to new problems such as sealing maintenance. Therefore, string reactors require technological innovation to meet engineering requirements. Utility Model Content

[0007] In view of all or part of the above technical problems existing in the prior art, the utility model provides a series tube reactor with a jacketed water-air cooling tube bank.

[0008] To achieve the above objectives, the present invention provides the following technical solutions:

[0009] A series pipe reactor with a jacketed water-air cooling tube bank is provided, comprising a plurality of straight sleeves, a plurality of bent pipes and a jacket connecting pipe, wherein each straight sleeve comprises an inner pipe and an outer pipe, the inner pipe being inserted into the outer pipe to form an annular straight jacket flow channel; the inner pipes of the plurality of straight sleeves are connected in series via the bent pipes to form a medium flow channel for transporting reactants and for reaction; the reactor is characterized in that:

[0010] The outer tube of each straight jacket is divided into two outer tube segments, and a sealing structure is formed between the two ends of each outer tube segment and the inner tube, thereby dividing the straight jacket flow channel into an upper jacket segment and a lower jacket segment. The upper jacket segments are connected in series via jacket connecting pipes to form an upper jacket flow channel, and the lower jacket segments are connected in series via jacket connecting pipes to form a lower jacket flow channel. Cooling water circulates independently in the upper jacket flow channel and the lower jacket flow channel.

[0011] The upper jacket flow channel and / or the lower jacket flow channel are connected to an air cooler, thereby forming a self-cooling upper jacket water circulation system and / or lower jacket water circulation system.

[0012] Specifically, the ends of the upper jacket segment and the lower jacket segment are provided with a jacket inlet and a jacket outlet.

[0013] Specifically, all the upper jacket segments are connected in series and then connected to the air cooler; or several upper jacket segments are connected in series and then connected to the air cooler and then to another several upper jacket segments.

[0014] Specifically, the air cooler corresponding to the upper jacket flow channel is located near the top of the straight sleeve.

[0015] Specifically, the air cooler includes an inlet header, an outlet header, and multiple finned tubes. The multiple finned tubes are arranged side by side, and their two ends are respectively connected to the inlet header and the outlet header; the finned tube includes a tube body and fins wound around it.

[0016] Specifically, the multiple finned tubes are arranged vertically, and the inlet header and the outlet header are arranged one above the other; or: the multiple finned tubes are arranged horizontally, and the inlet header and the outlet header are arranged side by side; or: turbulators are provided inside the finned tubes.

[0017] Specifically, the finned tubes of the air cooler are of a single-row structure, a double-row structure, or a multi-row structure, and the adjacent two rows of finned tubes in the multi-row structure are arranged staggeredly.

[0018] Specifically, the tube row composed of multiple finned tubes can be rotatably adjusted to face a preset direction.

[0019] Specifically, it further includes a steel structure support platform for supporting multiple vertical straight sleeves installed upright; the steel structure support platform is provided with a pipeline structure, and the inlet header, the outlet header, and the multiple finned tubes are integrated into the pipeline structure of the steel structure support platform.

[0020] Specifically, the tube body is a spiral corrugated pipe, a corrugated pipe, or a conical corrugated pipe.

[0021] Advantages of the present utility model:

[0022] A string tube reactor with a jacket water air-cooled tube row of the present utility model has the following advantages compared with the prior art:

[0023] (1) The cooling water flowing into the upper jacket circulates repeatedly in the system. During long-term operation, only a small amount of cooling water needs to be replenished due to reasons such as leakage. The amount of water lifted from the ground to the inlet of the upper jacket flow channel only needs to be completed once, thereby achieving the purpose of saving water resources and reducing operating costs.

[0024] (2) The air cooler is designed based on heat exchange requirements. After the cooling water flowing into the upper jacket is cooled by the air cooler, its temperature meets the process requirements. Moreover, since the air temperature is low and the flow rate is large at high altitudes, the air cooling effect is good, and there is no procurement cost for air, thereby achieving the purpose of reducing energy consumption and reducing operating costs. Description of the Drawings

[0025] Figure 1 It is a schematic diagram of an existing string tube reactor.

[0026] Figure 2 It is a connection schematic diagram between two straight sleeves of an existing string tube reactor.

[0027] Figure 3Schematic diagram of the connection structure between two straight sleeves of a string tube reactor with a jacket water air-cooled tube row in the embodiment.

[0028] Figure 4 Schematic diagram of the embodiment of the upper jacket segment and the lower jacket segment.

[0029] Figure 5 Schematic diagram of the finned tubes of the air cooler being horizontally arranged in the embodiment.

[0030] Figure 6 Schematic diagram of the finned tubes of the air cooler in the embodiment being multiple rows.

[0031] Figure 7 For Figure 3 Schematic diagram of further arranging an air cooler in the lower jacket flow channel.

[0032] Figure 8 Schematic diagram of the nozzle seat in the embodiment.

[0033] Figure 9 Stereogram of the nozzle seat in the embodiment.

[0034] Reference numerals:

[0035] Straight sleeve 1, elbow 2, jacket connecting pipe 3, expansion joint 4, air cooler 5, inlet header 51, outlet header 52, finned tube 53;

[0036] Inner tube 11, outer tube 12, outer tube segment 121, ring plate 122, upper jacket segment 13, lower jacket segment 14, jacket inlet 15, jacket outlet 16. Detailed implementation manners

[0037] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0038] A string tube reactor with a jacket water air-cooled tube row in this embodiment, in combination with Figure 1 , Figure 3 and Figure 4 as shown, includes a plurality of straight sleeves 1, a plurality of elbows 2 and a jacket connecting pipe 3. Each straight sleeve 1 includes an inner tube 11 and an outer tube 12, and the inner tube 11 passes through the outer tube 12 to form an annular straight jacket flow channel; the inner tubes 11 of the plurality of straight sleeves 1 are connected in series via elbows 2 to form a medium flow channel for transporting reaction materials and carrying out reactions.

[0039] The above is the basic structure of the existing string tube reactor, and the string tube reactor in this embodiment also has these bases. As an improvement:

[0040] The outer tube 12 of each straight sleeve 1 is separated into two outer tube segments 121, and a sealing structure is formed between the two ends of each outer tube segment 121 and the inner tube 11 (( Figure 4 Specifically, it is sealed by welding the ring plate 122)), so that the straight jacket flow channel is partitioned into an upper jacket segment 13 and a lower jacket segment 14. The upper jacket segments 13 of each straight sleeve 1 are connected in series through the upper jacket connecting pipe 3 to form an upper jacket flow channel. The lower jacket segments 14 of each straight sleeve 1 are connected in series through the middle jacket connecting pipe 3 to form a lower jacket flow channel. The upper jacket flow channel and the lower jacket flow channel circulate and flow cooling water independently of each other through a water pump.

[0041] As Figure 3 shown, for the lower jacket segments 14 of two straight sleeves 1, the cooling medium enters from the jacket inlet 15 of the lower jacket segment 14 on the right, enters the lower jacket segment 14 on the left through the middle jacket connecting pipe 3 from bottom to top, and then flows out from the jacket outlet 16 at the bottom left. For the upper jacket segments 13 of two straight sleeves 1, it flows in the same way as the solid arrow direction.

[0042] Specifically, the pipe diameters and wall thicknesses of the upper jacket segment 13 and the lower jacket segment 14 can be the same or different. The number and positions of the jacket segments of each straight sleeve 1 in the same reactor can be the same, so as to lift the cooling water to the same height and select a water pump with an appropriate power. If necessary, they can also be different.

[0043] Specifically, the jacket inlets 15 and jacket outlets 16 of each jacket segment are one or more than two, so as to form single-in single-out interfaces, single-in double-out, single-in multi-out, double-in single-out, multi-in multi-out or multi-in single-out interfaces. If there are more than two interfaces, they can be distributed circumferentially or axially around the outer tube.

[0044] Specifically, the flow directions of the cooling water in different jacket segments of the same straight sleeve 1 can be the same or different. The cooling water in the jacket segment flows in the same direction as or counterflows to the medium in the inner tube.

[0045] Specifically, the outer tube 12 and / or the jacket connecting pipe 3 of the jacket segment is provided with an expansion joint 4, preferably a single-wave expansion joint. Compared with the long jacket process, the thermal expansion difference between the inner tube 11 and the outer tube 12 during operation is reduced for the short jacket process, and the thermal expansion stresses between adjacent two jacket segments can cancel each other out. The multi-wave expansion joints that must be set on the ultra-long jacket can be cancelled, or only a single-wave expansion joint needs to be set, so as to simplify the structure and reduce the equipment cost.

[0046] In this embodiment, the upper jacket flow channel 13 is connected with an air cooler 5, so as to form a self-cooling upper half jacket water circulation system.

[0047] In practice, all the upper jacket segments 13 are connected to the air cooler 5 in series, that is, the cooling water flows through all the upper jacket segments 13 of the straight tubes 1 and then flows into the air cooler 5, and then continues to circulate through all the upper jacket segments 13. Or it can be changed to: several upper jacket segments 13 are connected to the air cooler 5 in series and then several other upper jacket segments 13 are connected in series, that is, the cooling water flows through several upper jacket segments 13 and then flows into the air cooler 5, and then flows to the upper jacket flow channels 13 of several other straight tubes 1.

[0048] In practice, the air cooler 5 corresponding to the upper jacket flow channel 13 is located at a position close to the top of the straight tube 1, that is, at the position of the elbow 2 close to the top. Specifically, the air cooler 5 includes an inlet header 51, an outlet header 52 and a plurality of finned tubes 53. The plurality of finned tubes 53 are arranged side by side and their two ends are respectively communicated with the inlet header 51 and the outlet header 52; the finned tube 53 includes a tube body and fins wound around the outside thereof.

[0049] The air cooler 5 has an automatic regulation function. When the seasonal air volume is large and the temperature is low, the number of finned tubes 53 through which the circulating water flows can be reduced or the number of finned tubes 53 swept by the air flow can be shielded for regulation. When the seasonal air volume is small and the temperature is high, it can be regulated by additionally using a fan to assist air cooling. The purpose is to achieve stable reaction of the inner tube medium and uniform product quality. The purpose of installing the fan is to regularly blow the dust accumulated on the fins to maintain good performance of the tube bank.

[0050] Specifically, as Figure 3 shown, the plurality of finned tubes 53 are arranged vertically, the inlet header 51 and the outlet header 52 are arranged vertically up and down, and the fins are designed in an umbrella shape so as not to accumulate dust in the air.

[0051] Or it can be changed to as Figure 5 shown, the plurality of finned tubes 53 are arranged horizontally, the inlet header 51 and the outlet header 52 are arranged horizontally left and right. When installed horizontally, no dust in the air will accumulate on various existing fins. When the finned tube 53 is installed horizontally, the inlets and outlets of its inlet header 51 and outlet header 52 can be arranged at the upper part, or can be arranged at the lower part, or one interface can be arranged at the upper part and the other interface can be arranged at the lower part separately.

[0052] In practice, turbulators can be arranged in the finned tube 53 to improve the heat transfer effect of the jacket water.

[0053] Specifically, the finned tubes of the air cooler 5 are of a single-row structure, a double-row structure or a multi-row structure. As Figure 6 shown, the adjacent two rows of finned tubes in the multi-row structure are arranged staggeredly. It can enable the air cooler to fully contact the air, and the air volume can be directly blown on the air cooler.

[0054] In practice, it is optional that the tube bank composed of multiple finned tubes can be rotationally adjusted and set to face a preset direction, so that the row surface of the finned tubes faces the conventional monsoon direction to obtain a good wind (air) cooling effect. At this time, the finned tubes can be connected to the inlet header and the outlet header with high-pressure resistant hoses.

[0055] In practice, it is also optional to include a steel structure support platform (not shown in the figure) for supporting multiple straight sleeves 1 installed vertically; the steel structure support platform is provided with a pipeline structure (for example, jacket water flows through the hollow railing, reducing equipment accessories at high altitudes and improving the efficiency of components), and the inlet header, the outlet header and multiple finned tubes are integrated into the pipeline structure of the steel structure support platform.

[0056] Specifically, the tube body is a spiral corrugated pipe, a corrugated tube or a tapered corrugated tube. Using high-efficiency characteristic heat exchange tubes instead of smooth tubes can increase the heat transfer area and improve the heat transfer coefficient at the same time, thus significantly reducing the volume of the heat exchanger and also improving the heat exchange efficiency. Some heat transfer tubes with special geometric shapes also have good self-cleaning effects, which can effectively extend the service time of the equipment. For example, inner-wave outer-spiral tubes, corrugated tubes and threaded tubes as heat transfer tubes are beneficial to the discharge of condensed liquid and can effectively reduce the retention of accumulated liquid. These high-efficiency characteristic heat exchange tubes are an upgraded version of the traditional smooth tube structure.

[0057] Another embodiment is as Figure 7 shown, the lower jacket flow channel is also connected to an air cooler 5, thus forming a self-cooling lower half jacket water circulation system, and at the same time, the lower jacket flow channel is also set as a jacket water air-cooling circulation system, further saving water resources, reducing energy consumption and reducing operating costs.

[0058] For the sealing of the end of the outer tube section 121, adjacent jacket segments of the same straight sleeve 1 can be connected through a nozzle seat as Figure 8 and Figure 9 shown. The structure of the nozzle seat can specifically refer to the technology disclosed in the Chinese patent document with the publication number CN117781739A to realize the independent segmentation of the outer tube while the inner tubes are connected. This will not be elaborated here. It can be seen that the jacket inlet and outlet are arranged on the nozzle seat. Of course, in practice, it can be changed to be arranged on the outer tube.

[0059] In the description of the present invention, obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0060] Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0061] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "inside", "upper", "lower", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is 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 therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0062] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "arranged", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside 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 situations.

Claims

1. A series of pipe reactors with a jacketed water-air cooling tube bank, comprising a plurality of straight sleeves, a plurality of elbows, and a jacket connecting pipe, wherein each straight sleeve comprises an inner tube and an outer tube, the inner tube being inserted into the outer tube to form an annular straight jacket flow channel; the inner tubes of the plurality of straight sleeves are connected in series via elbows to form a medium flow channel for transporting reactants and for reaction; wherein the plurality of straight sleeves comprises an inner tube and an outer tube, the inner tube being inserted into the outer tube to form an annular straight jacket flow channel; the plurality of straight sleeves having inner tubes connected in series via elbows to form a medium flow channel for transporting reactants and for reaction; wherein the plurality of straight sleeves comprises an inner tube and an outer tube, the inner tube being inserted into the outer tube to form an annular straight jacket flow channel; The outer tube of each straight jacket is divided into two outer tube segments, and a sealing structure is formed between the two ends of each outer tube segment and the inner tube, thereby dividing the straight jacket flow channel into an upper jacket segment and a lower jacket segment. The upper jacket segments are connected in series via jacket connecting pipes to form an upper jacket flow channel, and the lower jacket segments are connected in series via jacket connecting pipes to form a lower jacket flow channel. Cooling water circulates independently in the upper jacket flow channel and the lower jacket flow channel. The upper jacket flow channel and / or the lower jacket flow channel are connected to an air cooler, thereby forming a self-cooling upper jacket water circulation system and / or lower jacket water circulation system.

2. The string tube reactor with a jacket water and air-cooled tube bank according to claim 1, wherein: The ends of the upper jacket segment and the lower jacket segment are provided with a jacket inlet and a jacket outlet.

3. A series tube reactor with a jacket water air-cooled tube bank according to claim 1, characterized in that: All the upper jacket segments are connected in series and then connected to the air cooler; or several upper jacket segments are connected in series and then connected to the air cooler and then to another several upper jacket segments.

4. A series-tube reactor with a jacketed water-air-cooled tube bank according to claim 1, characterized in that: The air cooler corresponding to the upper jacket flow channel is located near the top of the straight sleeve.

5. The series tube reactor with a jacketed water-air cooled tube bank according to claim 1, wherein: The air cooler includes an inlet header, an outlet header and a plurality of finned tubes. The plurality of finned tubes are arranged in parallel and their two ends are respectively connected to the inlet header and the outlet header. The finned tubes include a tube body and fins wrapped around the tube body.

6. The string tube reactor with a jacket water and air-cooled tube bank according to claim 5, characterized in that: Multiple fin tubes are arranged vertically, with the inlet header and the outlet header arranged up and down; or: multiple fin tubes are arranged horizontally, with the inlet header and the outlet header arranged left and right; or: spoilers are provided in the fin tubes.

7. A series tube reactor with a jacketed water-air cooled tube bank according to claim 5, characterized in that: The finned tubes of the air cooler are of single-row structure, double-row structure or multi-row structure, and the adjacent rows of finned tubes in the multi-row structure are staggered.

8. The string tube reactor with a jacket water-air cooled tube bank according to claim 5, characterized in that: The tube bank composed of multiple finned tubes can be rotated and adjusted to face a preset direction.

9. A string tube reactor with a jacket water and air-cooled tube bank according to claim 5, characterized in that: It also includes a steel structure support platform for supporting multiple straight casings installed upright; the steel structure support platform is provided with a pipeline structure, and the inlet header, outlet header and multiple fin tubes are integrated into the pipeline structure of the steel structure support platform.

10. A string tube reactor with a jacket water-air cooled tube bank according to claim 5, characterized in that: The pipe body is a spiral corrugated pipe, a corrugated pipe, or a tapered pipe.

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