A coiled heat exchanger and methanol synthesis system

Abstract

The present application relates to a kind of winding heat exchanger and methanol synthesis system, including shell, shell side inlet, shell side outlet, tube side inlet and tube side outlet being arranged on shell, heat exchange tube being arranged in the inside of shell, still include heat insulating plate;The heat exchange tube is arranged in helix along the length direction of shell in shell, and multiple heat exchange tubes constitute multilayer coaxial helix structure, and each layer heat exchange tube is sequentially arranged from inside to outside along the radial direction of shell, and one helix unit of each layer heat exchange tube forms a heat exchange unit;Each layer heat exchange tube in heat exchange unit is all arranged heat insulating plate, and the heat exchange space of each layer heat exchange tube is formed between adjacent heat insulating plate;The heat insulating plate of adjacent heat exchange unit is discontinuous, and the gap between adjacent heat exchange unit forms buffer space.The present application solves the problem of interlayer heat exchange interference, and also realizes the reasonable transverse flow of shell side fluid, effectively improves the overall heat exchange effect of heat exchanger under the double action of improving the sufficiency and stability of heat transfer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchange, in particular to a winding type heat exchanger and a methanol synthesis system. BACKGROUND

[0002] The traditional winding type heat exchanger has a significant defect in the design of the multilayer coaxial spiral tube bundle: no effective separation structure is arranged between the layers, and the shell side fluid is prone to interlayer thermal short circuit, that is, the high-temperature fluid does not fully contact the heat exchange tube for heat exchange, but flows into the low-temperature area through the interlayer gap, mixes with the already cooled fluid, reduces the heat exchange temperature difference, and greatly reduces the overall heat exchange efficiency. At the same time, the unguided interlayer flow makes the shell side flow field turbulent, and is prone to form fluid stagnation dead zones, further wasting heat exchange area.

[0003] In the methanol synthesis system, the heat exchanger is required to complete the core processes such as synthesis gas preheating and reaction heat recovery, and the heat exchange efficiency and temperature control precision are strictly required. Due to the outlet temperature fluctuation caused by the thermal short circuit of the traditional winding type heat exchanger, it is difficult to meet the process stability requirement; and the local flow rate anomaly caused by the interlayer flow will aggravate the erosion of the heat exchange tube and increase the leakage risk, which not only affects the methanol yield and purity, but also may cause system shutdown and maintenance, and increases the production cost.

[0004] In addition, the traditional heat exchanger lacks adaptive design for the methanol synthesis working condition, the shell side fluid flow resistance is large, the energy consumption is high, and the heat in the central area is easy to be lost, further reducing the energy utilization efficiency. Therefore, it is a key requirement to develop a winding type heat exchanger that can block interlayer thermal short circuit, optimize flow field distribution, and adapt to the harsh working condition of methanol synthesis, to solve the bottleneck of the prior art and improve the efficiency and stability of the methanol synthesis system. SUMMARY

[0005] The present application aims to provide a winding type heat exchanger and a methanol synthesis system, which solves the problems of interlayer thermal short circuit and uneven heat exchange.

[0006] To achieve the above-mentioned purpose, according to one aspect of the present application, a winding type heat exchanger is provided, which comprises a shell, a shell inlet, a shell outlet, a tube inlet and a tube outlet arranged on the shell, a heat exchange tube arranged inside the shell, and further comprising a heat insulation plate;

[0007] The heat exchange tube is arranged in a spiral in the length direction of the shell, and a plurality of heat exchange tubes form a multilayer coaxial spiral structure, each layer of heat exchange tubes is arranged radially from inside to outside along the shell, and one spiral unit of each layer of heat exchange tubes forms a heat exchange unit;

[0008] The heat insulation plate is arranged between each layer of heat exchange tubes in the heat exchange unit, and the heat exchange space of each layer of heat exchange tubes is formed between adjacent heat insulation plates;

[0009] The heat insulation plates of adjacent heat exchange units are discontinuous, and the gap between the adjacent heat exchange units forms a buffer space.

[0010] Preferably, the heat exchanger further comprises an inner tube coaxially arranged in the center of the shell, and a transverse support, the heat exchange pipes are wound around the inner tube in a spiral structure.

[0011] The transverse support is arranged between the inner tube and the shell, or between the inner tube and the outermost heat insulation plate, the transverse support is arranged in the heat exchange unit along the direction from the inner heat insulation plate to the outer heat insulation plate, and can support the heat insulation plates in the heat exchange unit, and the number of the transverse supports in the heat exchange unit is plural.

[0012] Preferably, the transverse support is provided with a clamping piece for clamping the heat insulation plate.

[0013] Preferably, the innermost heat exchange space is formed between the innermost heat insulation plate and the inner tube, and the outermost heat exchange space is formed between the outermost heat insulation plate and the shell.

[0014] Preferably, the inner tube is made of heat insulation material.

[0015] Preferably, the heat exchanger further comprises a plurality of groups of longitudinal supports, and each group of longitudinal supports is in one of the following forms or a combination of two forms:

[0016] In the first form, the longitudinal support is arranged between adjacent heat exchange units and can support the heat insulation plates of the adjacent heat exchange units, and the number of the longitudinal supports between the adjacent heat exchange units is less than or equal to the number of the heat insulation plates in the heat exchange unit.

[0017] In the second form, the longitudinal support is arranged axially along the shell, penetrates through each heat exchange unit and is connected with the heat insulation plates in each heat exchange unit to support the heat insulation plates, and the number of the longitudinal supports is less than or equal to the number of the heat insulation plates in the heat exchange unit.

[0018] Preferably, the first tube plate is arranged on the tube side inlet and the tube side outlet respectively, and the tube hole is arranged on the first tube plate.

[0019] Preferably, the second tube plate is arranged in the shell at positions corresponding to the shell side inlet and the shell side outlet respectively, and the tube hole is arranged on the second tube plate.

[0020] The inner tube is arranged between the two second tube plates corresponding to the shell side inlet and the shell side outlet, and the tube hole is not arranged at the position corresponding to the inner tube in the middle of the second tube plate.

[0021] Preferably, the heat insulation plate of the end heat exchange unit is connected with the second tube plate.

[0022] According to another aspect of the present application, a methanol synthesis system is provided, comprising the winding heat exchanger.

[0023] Compared with the prior art, the present application has the following beneficial effects:

[0024] 1、The present application adopts the structure that the heat insulation plates are arranged between the heat exchange pipes in each layer of the heat exchange unit to form independent heat exchange spaces, so that the heat exchange spaces of the heat exchange pipes in each layer of the heat exchange unit are isolated from each other and the heat exchange does not interfere with each other, the uniformity of the heat exchange process of each layer is realized, the direct flow channeling of the shell side fluid between the layers is blocked, the local heat exchange unevenness caused by heat cross-talk between the layers is avoided, the interlayer heat short circuit problem of the traditional heat exchanger is solved from the root, and it is ensured that the shell side fluid can fully contact and exchange heat with the heat exchange pipes, so that the overall heat exchange efficiency is significantly improved.

[0025] 2、The present application adopts the structure that the heat insulation plates of adjacent heat exchange units are discontinuous and the gaps form buffer spaces, so that the pressure fluctuation of adjacent heat exchange units is balanced, the shell side fluid is guided to smoothly transition between the units, local vortex is avoided, the fluid stagnation dead zone is eliminated, the shell side flow field distribution is optimized, the heat exchange area is fully utilized, and the heat exchange efficiency and stability are further ensured; at the same time, the buffer spaces between adjacent heat exchange units form transverse flow channels, so that the shell side fluid can moderately flow and exchange heat in the layers, and then enter the next heat exchange unit after the temperature is uniform, so that the fluid temperature at the outlet of the shell side is uniform.

[0026] 3、The present application has buffer spaces through the discontinuous heat insulation plate design, which not only solves the heat exchange interference problem between the layers, but also realizes the reasonable transverse flow of the shell side fluid, so that the overall heat exchange effect of the heat exchanger is effectively improved under the double action, the generation of local low-efficiency heat exchange area is avoided, and the sufficiency and stability of heat transfer are improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structural schematic diagram of the present application;

[0028] Figure 2 is a structural schematic diagram of part of the present application, part of the shell is not shown, and the structure inside the shell is shown;

[0029] Figure 3 is a structural schematic diagram of part of the present application, mainly showing the arrangement mode of the heat exchange pipes inside the shell;

[0030] Figure 4 is a structural schematic diagram of the heat exchange unit and the support mode between the heat exchange units, mainly showing the heat exchange unit, the transverse support and the longitudinal support;

[0031] Figure 5 is an arrangement schematic diagram of the heat insulation plate inside the shell;

[0032] Figure 6 is an arrangement schematic diagram of the heat exchange pipe and the heat insulation plate inside the shell;

[0033] Figure 7 is a schematic view of the arrangement of the heat exchange pipes in the shell from another perspective of the application;

[0034] Figure 8 is a schematic view of the arrangement of the heat insulation plates and the transverse support members in the shell from another perspective of the application;

[0035] Figure 9 is a schematic view of the structure of the second tube plate.

[0036] In the figure:

[0037] 1 - shell; 2 - shell side inlet; 3 - shell side outlet; 4 - tube side inlet; 5 - tube side outlet; 6 - heat exchange pipe; 7 - heat insulation plate; 8 - first tube plate; 9 - transverse support member; 10 - longitudinal support member; 11 - inner tube; 12 - second tube plate. DETAILED DESCRIPTION

[0038] The application will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art to further understand the application, but do not limit the application in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the application. These are within the scope of the application.

[0039] Example 1:

[0040] A wound heat exchanger, as shown in Figures 1-8 , comprises a shell 1, a shell side inlet 2, a shell side outlet 3, a tube side inlet 4 and a tube side outlet 5 arranged on the shell 1, heat exchange pipes 6 arranged inside the shell 1, and heat insulation plates 7; the heat exchange pipes 6 are arranged in a spiral along the length direction of the shell 1, and a plurality of heat exchange pipes 6 form a multi-layer coaxial spiral structure, the heat exchange pipes 6 in each layer are arranged radially from inside to outside in sequence, and one spiral unit of the heat exchange pipes 6 in each layer forms a heat exchange unit; the heat exchange pipes 6 in each layer in the heat exchange unit are provided with heat insulation plates 7, and the heat exchange spaces of the heat exchange pipes 6 in each layer are formed between adjacent heat insulation plates 7; the heat insulation plates 7 of adjacent heat exchange units are discontinuous, and the gap between adjacent heat exchange units forms a buffer space.

[0041] The shell side fluid first enters the heat exchanger from the shell side inlet 2 on the shell 1, and first enters the first heat exchange unit. In each layer of the heat exchange space in the heat exchange unit, the shell side fluid and the tube side fluid exchange heat through the heat exchange tube wall by forced convection. If the shell side fluid is a heating medium, it releases heat to the tube side fluid and its temperature gradually decreases. If it is a cooling medium, it absorbs the heat of the tube side fluid and its temperature gradually increases. In this stage, due to the effect of the heat insulation plate 7, the fluid in each layer of the heat exchange space independently completes the heat exchange, and the shell side fluid in each layer does not mix and interfere, and can complete sufficient heat exchange under a stable temperature difference. However, due to the flow channel resistance, the contact temperature difference between the shell side fluid and the tube side fluid, and the ideal effect of the heat insulation plate 7, the temperature of the fluid in each layer will show small non-uniformity when it leaves the heat exchange unit (the heat insulation effect of the heat insulation plate 7 in one heat exchange unit can meet the requirements, and if the heat insulation plate 7 penetrates through the entire heat exchanger, the heat insulation effect is not ideal, and there will be a large temperature difference between the shell side fluid in each layer at the shell side outlet 3, and the temperature is not uniform).

[0042] The shell side fluid leaving the previous heat exchange unit will enter the buffer space between the heat exchange units as a whole. The core function of the buffer space is to eliminate the temperature difference of the shell side fluid in each layer and stabilize the flow state. Firstly, the temperature is uniformized. There is no heat exchange tube 6 and heat insulation plate 7 in the buffer space, and the shell side fluid is mixed naturally (or forcedly guided by an auxiliary flow guide structure) in the buffer space, which can eliminate the small temperature difference of the shell side fluid in each layer in the previous heat exchange unit, ensure that the temperature of the shell side fluid in each layer is consistent when it enters the next heat exchange unit, avoid the fluctuation of the heat exchange efficiency caused by the local temperature difference, and avoid the flow disorder caused by the large temperature difference between adjacent units. Secondly, the flow state is adjusted. The buffer space also plays a role in flow channel transition, and the dispersed fluid flowing out of each layer of the heat exchange space is re-collected into a stable whole flow beam, balances the pressure fluctuation of adjacent heat exchange units, guides the shell side fluid to smoothly transition between units, avoids the generation of local vortex, eliminates the fluid stagnation dead zone, optimizes the shell side flow field distribution, prepares for the uniform distribution of the next unit, and reduces the impact of fluid impact on the subsequent heat exchange unit.

[0043] After the temperature of the shell side fluid is uniformized in the buffer space, it will enter the next heat exchange unit with the same structure. In this way, the shell side fluid flows through all the heat exchange units in the circulation mode of “heat exchange unit → buffer space”, and gradually realizes the target heat exchange quantity between the shell side fluid and the tube side fluid (such as reaching the set outlet temperature). Finally, the shell side fluid is discharged from the shell side outlet 3 of the entire heat exchanger, and the whole heat exchange process is completed. The temperature uniformity of the shell side fluid at the shell side outlet 3 is high.

[0044] Preferably, the first tube plate 8 is arranged on the tube side inlet 4 and the tube side outlet 5 respectively, and the tube holes are arranged on the first tube plate 8. The second tube plate 12 is arranged in the corresponding position of the shell side inlet 2 and the shell side outlet 3 in the shell 1 respectively, and the tube holes are arranged on the second tube plate 12. The heat insulation plate 7 of the end heat exchange unit is connected with the second tube plate 12.

[0045] The second tube plate 12 can guide the shell side fluid to enter and flow out of each layer of the heat exchange space of each heat exchange unit uniformly, and the first tube plate 8 can realize accurate distribution and support and fixation of the tube side fluid. The cooperation of the two ensures that the shell side fluid and the tube side fluid can flow along the preset path, avoids local low-efficiency heat exchange caused by uneven fluid distribution, and makes the temperature of the shell side outlet 3 and the tube side outlet 5 controllable. It can meet the strict requirements of the methanol synthesis system on temperature control accuracy, ensure the process stability, and thus improve the methanol yield and purity.

[0046] Embodiment 2:

[0047] This embodiment is an improvement based on embodiment 1, and the specific improvement is that, as shown in Figures 4-9 the inner tube 11 is coaxially arranged in the center of the shell 1, and the heat exchange tube 6 is wound around the inner tube 11 in a spiral structure; the transverse support 9 is arranged between the inner tube 11 and the shell 1, or between the inner tube 11 and the outermost heat insulation plate 7. The transverse support 9 is arranged in the heat exchange unit along the direction from the inner heat insulation plate 7 to the outer heat insulation plate 7, and can support each layer of heat insulation plate 7 in the heat exchange unit. The number of transverse supports 9 in the heat exchange unit is multiple. The innermost heat exchange space is formed between the innermost heat insulation plate 7 and the inner tube 11, and the outermost heat exchange space is formed between the outermost heat insulation plate 7 and the shell 1. The inner tube 11 is made of heat insulation material.

[0048] Exemplarily, the transverse support 9 is welded to the heat insulation plate 7. Exemplarily, one transverse support 9 is used to support the same radial position of each layer of heat insulation plate 7 in the heat exchange unit, and the number of transverse supports 9 in the heat exchange unit is four, which are uniformly distributed.

[0049] By arranging the inner tube 11 coaxially in the center of the shell 1 and making it of heat insulation material, on the one hand, a central support reference is provided for the multi-layer spiral heat exchange tube, ensuring regular tube bundle arrangement; on the other hand, heat loss in the central area is blocked, energy loss is reduced, and the independent heat exchange space formed by the innermost heat insulation plate and the inner tube also expands the effective heat exchange area, which meets the energy recovery demand of the methanol synthesis system.

[0050] The transverse support 9 is arranged from the inner heat insulation plate 7 to the outer heat insulation plate 7, and can directly form rigid support for each layer of heat insulation plate 7 in the heat exchange unit, so as to avoid the impact force generated when the shell side fluid flows from causing the heat insulation plate 7 to be displaced, deformed or inclined. The transverse support 9 can indirectly form limiting (by fixing the radial position of the heat insulation plate 7) for the heat exchange pipe 6 wound between the heat insulation plates 7 while supporting the heat insulation plate 7, and simultaneously limit the radial deviation of the heat exchange pipe 6, so as to avoid the multi-layer coaxial spiral heat exchange pipe 6 from being dislocated between layers due to vibration, thermal expansion or fluid scouring in long-term operation, and ensure that the heat exchange pipe 6 always maintains regular spiral arrangement, thereby creating stable conditions for the shell side fluid to uniformly flow through each layer of heat exchange pipe 6.

[0051] The heat exchanger shell 1, the heat insulation plate 7 and the heat exchange pipe 6 will generate thermal expansion stress due to temperature change, and the shell side fluid pressure fluctuation will also generate impact stress on the internal components. The transverse support 9 can uniformly disperse these stresses in the radial direction to the inner pipe 11 or the shell 1, so as to avoid stress concentration from causing the heat insulation plate 7 to crack and the heat exchange pipe 6 to be damaged, and improve the fatigue resistance and working condition adaptability of the entire heat exchanger internal structure. The structural design (such as the streamlined shape of the flow channel) of the transverse support 9 can avoid excessive obstruction to the shell side fluid, and at the same time, the fixed support spacing thereof can guide the fluid to be uniformly distributed in the radial direction, thereby preventing local vortex from being generated due to slight shaking of the heat insulation plate 7.

[0052] Preferably, the transverse support 9 is provided with a clamping piece for clamping with the heat insulation plate 7. This makes installation convenient, and welding can also be performed on the basis of clamping, thereby ensuring the stability of the connection.

[0053] Preferably, the inner pipe 11 is arranged between the two second tube plates 12 corresponding to the shell side inlet 2 and the shell side outlet 3, as shown in Figure 9 The second tube plate 12 does not have a tube hole at the position corresponding to the inner pipe 11. This makes the shell side fluid at the shell side inlet 2 and the shell side outlet 3 not enter the inner pipe 11, thereby blocking the heat loss in the central area.

[0054] Embodiment 3:

[0055] This embodiment is an improvement based on the embodiment 1 or the embodiment 2, and the specific improvement is that, as shown in Figure 4As shown, the shell 1 further comprises a plurality of sets of longitudinal supports 10, one set of longitudinal supports 10 being in one or a combination of the following forms: in a first form, the longitudinal supports 10 are arranged between adjacent heat exchange units and can support the heat insulation plates 7 of the adjacent heat exchange units; the number of longitudinal supports 10 between adjacent heat exchange units is less than or equal to the number of heat insulation plates 7 in the heat exchange units. In a second form, the longitudinal supports 10 are arranged along the axial direction of the shell 1, penetrating through the heat exchange units and being connected with the heat insulation plates 7 in the heat exchange units to support the heat insulation plates 7; the number of longitudinal supports 10 is less than or equal to the number of heat insulation plates 7 in the heat exchange units.

[0056] For example, the shell 1 comprises four sets of longitudinal supports 10, which are uniformly distributed in the heat exchange units, the innermost and outermost longitudinal supports 10 in one set of longitudinal supports 10 are in the second form, and the rest are in the first form, and each layer of heat insulation plates 7 is provided with longitudinal supports 10.

[0057] The longitudinal supports 10 extend along the axial direction of the shell 1, are directly connected with the heat insulation plates 7 in the heat exchange units or form a limit, and can effectively constrain the axial movement of the heat insulation plates. When the shell side fluid flows through the heat exchange units and the buffer space along the axial direction, an axial thrust is generated on the heat insulation plates 7, especially under high-temperature working conditions, the heat insulation plates may move axially due to thermal expansion, and the longitudinal supports can offset this force to avoid mispositioning of the heat insulation plates 7, which leads to axial communication of the independent heat exchange spaces or confusion with the buffer spaces of adjacent heat exchange units.

[0058] The heat exchange units composed of the multi-layer spiral heat exchange pipes 6 and the heat insulation plates 7 are prone to axial vibration as a whole due to local impact when the shell side fluid flows at high speed or pressure fluctuates. The longitudinal supports 10 integrate the dispersed heat exchange units into a more stable whole structure by connecting the heat insulation plates 7 of multiple heat exchange units, reduce the relative vibration between the heat exchange units, avoid fatigue damage of the heat insulation plates 7 and the heat exchange pipes 6 due to long-term vibration, prevent flow field disorder caused by vibration, and ensure stable flow of the shell side fluid through each layer of heat exchange space.

[0059] Under high-temperature working conditions, the components such as the heat insulation plates 7, the heat exchange pipes 6, and the shell 1 in the heat exchanger will axially expand due to temperature changes, and the difference in expansion coefficients of components made of different materials may cause axial stress concentration, leading to problems such as cracking of the heat insulation plates 7 and leakage of the heat exchange pipes 6. The longitudinal supports 10 can provide reasonable buffering for the axial expansion of the components through their rigidity or elasticity design, and uniformly disperse the axial stress to the shell 1 or the inner pipe 11, avoiding excessive local stress from damaging the internal structure and improving the adaptability of the equipment under high-temperature working conditions.

[0060] Embodiment 4:

[0061] A methanol synthesis system comprising the winding heat exchanger described above.

[0062] The fresh synthesis gas is divided into two streams for methanol synthesis. The fresh synthesis gas is mixed with the recycled gas and then enters two parallel synthesis reactors to undergo synthesis reaction under catalytic conditions. The gas discharged from the synthesis reactors is first subjected to heat exchange and cooling, and then enters a methanol separator for gas-liquid separation.

[0063] The hot gas from the methanol synthesis reactor first enters the shell side of the coiled heat exchanger for heat exchange (primary cooling) and then enters the methanol separator. The gas entering the synthesis reactor first enters the tube side of the coiled heat exchanger for preheating and then enters the synthesis reactor.

[0064] The methanol synthesis system of the present embodiment can improve heat exchange efficiency, solve the temperature fluctuation at the inlet of the synthesis reactor and the methanol separator caused by insufficient heat exchange, reduce the process parameter drift caused by heat exchange efficiency decay, and thus improve the efficiency and stability of the methanol synthesis system.

[0065] In the present application, if the terms such as "up", "down", "left", "right", "bottom", "top" are used, they are defined with respect to the directions in the drawings, and are only used to represent the relative positional relationship. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. These or other orientation terms should not be understood as limiting terms.

[0066] In the present application, the terms such as "one", "a", "an", "the", etc. do not represent quantity limitation, and can represent singular or plural. The terms "include", "contain", "have", and any variations thereof in the present application are intended to cover non-exclusive inclusion; if the present application involves the terms "first", "second", "third", etc., they are only used to distinguish similar objects, and do not represent a specific order of the objects.

[0067] In the present application, when it is described that a specific device is located between a first device and a second device, there can be an intervening device between the specific device and the first device or the second device, or there can be no intervening device. When it is described that a specific device is connected to other devices, the specific device can be directly connected to the other devices without an intervening device, or can not be directly connected to the other devices with an intervening device.

[0068] In addition, the technologies and devices known to those skilled in the relevant art are not discussed in detail, but in appropriate cases, the technologies and devices should be considered as part of the specification.

[0069] The specific embodiments of the present application are described above. It needs to be understood that the present application is not limited to the specific embodiments described above, and various changes or modifications can be made by those skilled in the art within the scope of the claims, which does not affect the essential content of the present application. The embodiments of the present application and the features in the embodiments can be combined with each other at will without conflict.

Claims

1. A spiral wound heat exchanger comprising a shell (1), a shell side inlet (2), a shell side outlet (3), a tube side inlet (4) and a tube side outlet (5) provided on the shell (1), a heat exchange tube (6) provided inside the shell (1), characterized in that, The heat insulation plate (7) is further included. The heat exchange pipes (6) are arranged in a spiral manner along the length direction of the shell (1) in the shell (1), and a plurality of the heat exchange pipes (6) form a multi-layer coaxial spiral structure, and the heat exchange pipes (6) in each layer are arranged in sequence from inside to outside along the radial direction of the shell (1), and one spiral unit of the heat exchange pipes (6) in each layer forms one heat exchange unit. The heat insulation plates (7) are arranged between the heat exchange pipes (6) in each layer in the heat exchange unit, and the heat exchange spaces of the heat exchange pipes (6) in each layer are formed between the adjacent heat insulation plates (7). The heat insulation plates (7) of adjacent heat exchange units are discontinuous, and the gaps between the adjacent heat exchange units form buffer spaces.

2. The wound heat exchanger of claim 1, wherein The inner pipe (11) and the transverse support (9) are further included, the inner pipe (11) is coaxially arranged in the inner center of the shell (1), and the heat exchange pipes (6) are wound around the inner pipe (11) to form a spiral structure. The transverse support (9) is arranged between the inner pipe (11) and the shell (1) or between the inner pipe (11) and the outermost heat insulation plate (7), the transverse support (9) is arranged in the direction from the inner heat insulation plate (7) to the outer heat insulation plate (7) in the heat exchange unit, can support the heat insulation plates (7) in each layer in the heat exchange unit, and the number of the transverse supports (9) in the heat exchange unit is multiple.

3. The wound heat exchanger of claim 2, wherein, The transverse support (9) is provided with a clamping piece, and the clamping piece is used for clamping the heat insulation plate (7).

4. The wound heat exchanger of claim 2, wherein, The innermost heat exchange space is formed between the innermost heat insulation plate (7) and the inner pipe (11), and the outermost heat exchange space is formed between the outermost heat insulation plate (7) and the shell (1).

5. The wound heat exchanger of claim 2, wherein, The inner pipe (11) is made of a heat insulation material.

6. The wound heat exchanger of claim 1, wherein A plurality of longitudinal supports (10) are further included, and one group of longitudinal supports (10) adopts one or a combination of the following two forms: In the first form, the longitudinal support (10) is arranged between adjacent heat exchange units and can support the heat insulation plates (7) of the adjacent heat exchange units; the number of the longitudinal supports (10) between the adjacent heat exchange units is less than or equal to the number of the heat insulation plates (7) in the heat exchange unit; In the second form, the longitudinal support (10) is arranged in the axial direction of the shell (1), penetrates through each heat exchange unit and is connected with the heat insulation plates (7) in each heat exchange unit to support the heat insulation plates (7); the number of the longitudinal supports (10) is less than or equal to the number of the heat insulation plates (7) in the heat exchange unit.

7. The wound heat exchanger of claim 1, wherein First pipe plates (8) are arranged on the tube side inlet (4) and the tube side outlet (5) respectively, and pipe holes are arranged on the first pipe plates (8).

8. The wound heat exchanger of claim 2, wherein, Second pipe plates (12) are arranged at positions corresponding to the shell side inlet (2) and the shell side outlet (3) in the shell (1) respectively, and pipe holes are arranged on the second pipe plates (12); The inner pipe (11) is arranged between the two second pipe plates (12) corresponding to the shell side inlet (2) and the shell side outlet (3), and no pipe hole is arranged at the position corresponding to the inner pipe (11) in the middle of the second pipe plate (12).

9. The wound heat exchanger of claim 8, wherein, The heat insulation plate (7) of the end heat exchange unit is connected with the second pipe plate (12).

10. A methanol synthesis system characterized by, The winding heat exchanger of any one of claims 1-9 is included.

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