Hydraulic turbine for methanol production and methanol synthesis system

Abstract

According to the hydraulic turbine for methanol production, the first volute flow channel and the second volute flow channel are sequentially arranged in the main body, so that crude methanol liquid enters the first volute flow channel and the second volute flow channel through the liquid inlet flow channel, and the flowing directions of the crude methanol liquid in the first volute flow channel and the second volute flow channel are opposite; when the impeller set is impacted and driven by the first volute flow channel and the second volute flow channel, axial force generated on the rotating shaft is opposite, so that the axial force self-balancing effect is achieved, the axial force burden of the turbine rotating shaft on the bearing is reduced under the condition that pressure fluctuation is caused by wax precipitation particles generated by crude methanol liquid, and the service life of the turbine rotating shaft is prolonged. Therefore, the technical problems that in the methanol production process, a bearing of a turbine rotating shaft is damaged due to pressure fluctuation, and even a whole methanol synthesis system stops or leaks are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of methanol production, and specifically relates to a hydraulic turbine and a methanol synthesis system used for methanol production. Background Art

[0002] Methanol is an important raw material for the chemical industry and also an important product. In methanol production, after the gas coming out of the synthesis reactor is cooled, the gas is circulated back to the reactor entrance, and the crude methanol liquid containing methanol and water enters the tank area or enters the distillation to separate the refined methanol. The pressure of the synthesis reactor is relatively high, up to 8.0MPa, and the pressure of the irrigation area and the distillation tower is relatively low, generally around 0.4MPa. At present, the methanol synthesis system directly inputs the crude methanol liquid in a high-pressure state directly into the irrigation area and the distillation tower in a low-pressure state, and the pressure energy of the crude methanol liquid is completely lost in this process. If the pressure energy of this part of the crude methanol liquid is recycled, a good energy-saving effect can be obtained, bringing considerable economic benefits. Related content is also disclosed in some existing patent documents.

[0003] For example, the patent application document with application number CN201210119479.1 discloses a methanol synthesis process and a methanol synthesis system, which recycles the pressure energy of crude methanol liquid by setting a turbine, thereby saving energy. However, in the methanol production process, wax particles will be generated in the crude methanol liquid, which will cause pressure fluctuations in the crude methanol liquid during operation, causing unstable axial force of the turbine shaft, damaging the bearings of the turbine shaft, and even causing the entire methanol synthesis system to shut down or leak. Summary of the invention

[0004] In order to solve the technical problem in the background technology that wax particles are generated in the crude methanol liquid during the methanol production process, causing crude pressure fluctuations, making the axial force of the turbine shaft unstable, damaging the bearings of the turbine shaft, and even causing the entire methanol synthesis system to stop or leak, the present invention provides a hydraulic turbine and a methanol synthesis system for methanol production.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides a hydraulic turbine for methanol production, characterized in that the hydraulic turbine comprises a main body and a rotating shaft;

[0007] The main body is provided with a first volute flow channel and a second volute flow channel sequentially arranged along a first direction;

[0008] The rotating shaft penetrates the first volute flow channel and the second volute flow channel along the first direction; an impeller group is arranged on the rotating shaft, a part of the impeller group is arranged in the first volute flow channel, and the other part is arranged in the second volute flow channel;

[0009] The main body is provided with a liquid inlet flow channel and a liquid outlet flow channel, and the liquid inlet flow channel and the liquid outlet flow channel are both connected to the first volute flow channel and the second volute flow channel;

[0010] In the first volute flow passage and the second volute flow passage, the flow directions of the crude methanol liquid in the first direction are opposite, and the impact force applied by the crude methanol liquid to the impeller group is in the same direction in the circumferential direction of the rotating shaft.

[0011] Optionally, a first spacing section is arranged between the first volute flow channel and the second volute flow channel; the part of the impeller group in the first volute flow channel is the first impeller group, and the part of the impeller group in the first volute flow channel is the second impeller group; the first impeller group and the second impeller group are symmetrically arranged about the first spacing section.

[0012] Optionally, the first impeller group includes a plurality of first impellers, which are arranged on the rotating shaft in sequence along the first direction; a plurality of first partitions are arranged in the first volute flow channel; and one first partition is inserted between any two adjacent first impellers; the second impeller group includes a plurality of second impellers, which are arranged on the rotating shaft in sequence along the first direction; a plurality of second partitions are arranged in the second volute flow channel; and one second partition is inserted between any two adjacent second impellers.

[0013] Optionally, the first volute flow channel includes a first inlet and a first outlet; the first inlet is arranged close to the second volute flow channel, and the first outlet is arranged away from the second volute flow channel; the second volute flow channel includes a second inlet and a second outlet; the second inlet is arranged close to the first volute flow channel, and the second outlet is arranged away from the first volute flow channel; the first inlet and the second inlet are both connected to the liquid inlet flow channel; the first outlet and the second outlet are both connected to the liquid outlet flow channel.

[0014] Optionally, the liquid inlet flow channel is arranged between the first volute flow channel and the second volute flow channel.

[0015] Optionally, the main body includes a driving side and a non-driving side that are opposite to each other in the first direction; the rotating shaft extends from the driving side and the non-driving side; the end of the rotating shaft extending from the driving side is the driving end, and the driving end is provided with a coupling for connecting to a power generation device; the end of the rotating shaft extending from the non-driving side is the non-driving end, and the non-driving end is provided with a speed measuring disc.

[0016] Optionally, the non-driving side is further provided with a pressure reduction chamber, and the pressure reduction chamber is arranged inside the main body; the pressure reduction chamber is connected to the first volute flow channel and the liquid outlet flow channel.

[0017] Optionally, a one-way valve is provided between the pressure reducing chamber and the liquid outlet channel.

[0018] In a second aspect, the present invention further provides a methanol synthesis system, characterized in that the methanol synthesis system comprises a synthesis tower, a separator, an expansion tank and a hydraulic turbine as described in any one of the above items;

[0019] Wherein, the input end of the separator is connected to the output end of the synthesis tower;

[0020] The liquid inlet passage of the hydraulic turbine is in communication with the output end of the separator;

[0021] The liquid outlet passage of the hydraulic turbine is communicated with the expansion tank.

[0022] Optionally, the methanol synthesis system further comprises a parallel pipeline, wherein the parallel pipeline is connected to the output end of the separator and the expansion tank.

[0023] The beneficial effects of the present invention are:

[0024] (1) The present invention provides a hydraulic turbine for methanol production, wherein a first volute flow channel and a second volute flow channel arranged in sequence are provided in a main body, so that crude methanol liquid enters the first volute flow channel and the second volute flow channel respectively through the liquid inlet flow channel, and flows in opposite directions in the first volute flow channel and the second volute flow channel, so that when the first volute flow channel and the second volute flow channel impact and drive the impeller group, the axial forces generated on the rotating shaft are opposite, thereby achieving the effect of self-balancing of the axial force. When the crude methanol liquid generates wax particles and causes pressure fluctuations, the axial force burden of the turbine shaft on the bearing is reduced. Therefore, the technical problem of damage to the turbine shaft bearing due to pressure fluctuations during the methanol production process, or even causing the entire methanol synthesis system to stop or leak, is solved.

[0025] (2) At the same time, the hydraulic turbine of the present invention is also provided with a pressure reducing chamber built into the main body. Through the pressure reducing chamber, the pressure of the crude methanol liquid at the outlet of the first volute flow channel and the second volute flow channel is reduced to the pressure of the liquid outlet flow channel, thereby ensuring the sealing performance during use. At the same time, the built-in pressure reducing chamber does not require external pipes, reducing the risk of leakage caused by multiple external pipes.

[0026] (3) The present invention also provides a methanol synthesis system, in which the hydraulic turbine provided by the present invention is connected in series between the separator and the expansion tank, so as to recycle the pressure energy of the crude methanol liquid, thereby achieving good energy-saving effect and avoiding the technical problem that wax particles generated in the crude methanol liquid cause crude pressure fluctuations, make the axial force of the turbine shaft unstable, damage the bearings of the turbine shaft, and even cause the entire methanol synthesis system to shut down or leak.

[0027] (4) At the same time, in the methanol synthesis system, a parallel pipeline is set up to connect the output end of the separator and the expansion tank, so as to play a backup role and ensure that the methanol synthesis system will not be forced to stop when the hydraulic turbine fails or needs maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic cross-sectional view of a hydraulic turbine in the present invention;

[0029] Figure 2 is a schematic diagram of a first volute flow passage and a second volute flow passage in the present invention;

[0030] Figure 3 is a schematic diagram of the first impeller assembly and the second impeller assembly in the present invention;

[0031] Figure 4 is a further schematic diagram of the first volute flow channel and the second volute flow channel in the present invention;

[0032] Figure 5 Schematic diagram of the driving side and non-driving side of the hydraulic turbine in the present invention;

[0033] Figure 6 is a schematic diagram of the decompression chamber in the present invention;

[0034] Figure 7 Schematic diagram of the methanol synthesis system of the present invention.

[0035] Wherein: 1. main body; 11. first volute flow channel; 111. first partition; 112. first inlet; 113. first outlet; 12. second volute flow channel; 121. second partition; 122. second inlet; 123. second outlet; 13. liquid inlet flow channel; 14. liquid outlet flow channel; 15. interval section; 16. drive side; 17. non-drive side; 18. pressure reduction chamber; 2. rotating shaft; 21. first impeller group; 211. first impeller; 22. second impeller group; 221. second impeller; 23. drive end; 24. non-drive end; 3. first direction; 4. synthesis tower; 5. separator; 6. expansion tank; 7. hydraulic turbine; 8. parallel pipeline. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0038] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0039] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0040] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0041] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0042] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0043] In the prior art, the liquid in the hydraulic turbine generally flows in one direction, that is, it flows from one side of the turbine to the other side, thereby driving the impeller and the rotating shaft of the turbine to rotate; in the prior art, devices such as a balancing drum or a balancing disk are generally used to balance the axial force on the rotating shaft; however, in the production process of methanol, the crude methanol liquid is accompanied by the presence of three-phase flow of liquid, gas (hydrogen) and solid (wax deposition), which is very likely to produce pressure fluctuations. At this time, the traditional axial force balancing mechanism is very likely to cause axial force instability due to pressure fluctuations. At the same time, the traditional axial force balancing mechanism is also very likely to be worn by particles formed by wax deposition, which in turn leads to a decrease in the reliability and life of the turbine, and even leads to leakage risks.

[0044] First, see Figure 1 , shows a schematic diagram of a hydraulic turbine for methanol production described in the present invention, wherein the hydraulic turbine comprises: a main body 1 and a rotating shaft 2; a first volute flow channel 11 and a second volute flow channel 12 are arranged in sequence along a first direction 3 in the main body 1; the rotating shaft 2 penetrates the first volute flow channel 11 and the second volute flow channel 12 along the first direction 3; an impeller group is arranged on the rotating shaft 2, a part of the impeller group is arranged in the first volute flow channel 11, and the other part is arranged in the second volute flow channel 12; an inlet flow channel 13 and an outlet flow channel 14 are arranged on the main body 1. The liquid flow channel 14, the liquid inlet flow channel 13 and the liquid outlet flow channel 14 are all connected to the first volute flow channel 11 and the second volute flow channel 12; the liquid inlet flow channel 13 is used to allow the crude methanol liquid to enter the first volute flow channel 11 and the second volute flow channel 12, and the liquid outlet flow channel 14 is used to discharge the crude methanol liquid passing through the first volute flow channel 11 and the second volute flow channel 12; in the first volute flow channel 11 and the second volute flow channel 12, the flow directions of the crude methanol liquid in the first direction 3 are opposite, and the impact force applied by the crude methanol liquid to the impeller group is in the same direction in the circumferential direction of the rotating shaft 2.

[0045] In this embodiment, a hydraulic turbine for methanol production is provided. By arranging a first volute flow channel 11 and a second volute flow channel 12 arranged in sequence along a first direction in a main body 1, crude methanol liquid enters the first volute flow channel 11 and the second volute flow channel 12 respectively through a liquid inlet flow channel 13, and flows in opposite directions in the first volute flow channel 11 and the second volute flow channel 12, so that when the crude methanol liquid impacts and drives the impeller group in the first volute flow channel 11 and the second volute flow channel 12, the axial forces generated on the rotating shaft 2 are opposite, thereby achieving the effect of axial force self-balancing. In a specific application, when wax particles are generated in the crude methanol liquid and cause pressure fluctuations, the pressure generated on the rotating shaft in the first volute flow channel 11 and the second volute flow channel 12 is self-balanced, which greatly reduces the axial force burden of the turbine rotating shaft 2 on the bearing, thereby solving the technical problem that the bearing of the turbine rotating shaft 2 is damaged due to pressure fluctuations during the methanol production process, and even the entire methanol synthesis system is shut down or leaked.

[0046] Furthermore, the main body 1 can be composed of a shell, a support frame and a bearing component; the first volute flow channel 11 and the second volute flow channel 12 are arranged in the shell, and the liquid inlet flow channel 13 and the liquid outlet flow channel 14 are arranged on the shell; the bearing component is used to connect the rotating shaft 2 and the shell; the support frame is used to support the shell.

[0047] Furthermore, the housing may be composed of a pressure-bearing housing and an end cover housing, and the pressure-bearing housing and the end cover housing are detachably connected. Specifically, the first volute flow channel 11 and the second volute flow channel 12 are arranged in the pressure-bearing housing; the end cover housing is arranged on the side of the pressure-bearing housing in the first direction, and is connected to the pressure-bearing housing by bolts, etc., so that the end cover housing is easy to disassemble, so as to perform operations such as maintenance on the first volute flow channel 11, the second volute flow channel 12 and the rotating shaft 2.

[0048] Furthermore, a sealing assembly should be provided between the pressure-bearing shell and the end cover shell, and between the end cover shell and the rotating shaft 2 .

[0049] Optionally, refer to Figure 1 A spacing section 15 is provided between the first volute flow channel 11 and the second volute flow channel 12 described in the present invention; the part of the impeller group in the first volute flow channel 11 is the first impeller group 21, and the part of the impeller group in the second volute flow channel 12 is the second impeller group 22; the first impeller group 21 and the second impeller group 22 are symmetrically arranged about the first spacing section 15.

[0050] In this embodiment, the first volute flow channel 11 and the second volute flow channel 12 are separated by a spacing section 15, and the first impeller group 21 and the second impeller group 22 on the rotating shaft 2 are symmetrically arranged about the first spacing section 15, thereby ensuring that during use, the driving force exerted by the crude methanol liquid on the first impeller group 21 and the second impeller group 22 is equal, thereby making the axial forces on the rotating shaft 2 offset each other and achieving self-balancing.

[0051] Optionally, refer to Figure 2 and Figure 3 The first impeller group 21 described in the present invention includes a plurality of first impellers 211, and the plurality of first impellers 211 are sequentially arranged on the rotating shaft 2 along the first direction 3; in the first volute flow channel 11, a plurality of first partitions 111 are arranged, and a first partition 111 is arranged between each adjacent two first impellers 211; the second impeller group 22 includes a plurality of second impellers 221, and the plurality of second impellers 221 are sequentially arranged on the rotating shaft 2 along the first direction 3; in the second volute flow channel 12, a plurality of second partitions 121 are arranged, and a second partition 121 is arranged between each adjacent two second impellers 221.

[0052] In this embodiment, a first partition 111 is provided between two adjacent first impellers 211, and a second partition 121 is provided between two adjacent second impellers 221. The first partition 111 and the second partition 121 separate the crude methanol liquid between the two adjacent impellers to avoid cross-contamination. Furthermore, since the pressure of the crude methanol liquid gradually decreases when flowing in the volute flow channel, the partition can be used to isolate different pressures and impellers to avoid affecting the power generation efficiency of the turbine.

[0053] Furthermore, the pressure-bearing shell and the separator in this embodiment can both adopt a forged structure. Compared with a cast structure, a forged structure has the advantages of tighter material, easier flaw detection and maintenance.

[0054] Further, see Figure 3 In this embodiment, the first impeller 211 and the second impeller 221 can adopt a reverse structure in the first direction, so as to drive the rotating shaft 2 to rotate when the crude methanol liquid flows in the opposite direction. At the same time, it should be noted that those skilled in the art can select the number of the first impeller 211 and the second impeller 221 according to actual needs, and no specific limitation is made in this embodiment.

[0055] Optionally, refer to Figure 4 The first volute flow channel 11 described in the present invention includes a first inlet 112 and a first outlet 113; the first inlet 112 is arranged close to the second volute flow channel 12, and the first outlet 113 is arranged away from the second volute flow channel 12; the second volute flow channel 12 includes a second inlet 122 and a second outlet 123; the second inlet 122 is arranged close to the first volute flow channel 11, and the second outlet 123 is arranged away from the first volute flow channel 11; the first inlet 112 and the second inlet 121 are both connected to the liquid inlet flow channel 13; the first outlet 113 and the second outlet 123 are both connected to the liquid outlet flow channel 14.

[0056] In this embodiment, by arranging the first inlet 112 close to the second volute flow channel 12, the first outlet 113 away from the second volute flow channel 12, the second inlet 122 close to the first volute flow channel 11, and the second outlet 123 away from the first volute flow channel 11, it is achieved that the crude methanol liquid enters the first volute flow channel 11 and the second volute flow channel 12 respectively through the liquid inlet flow channel 13, and enters the liquid outlet channel from the first outlet 113 and the second outlet 123. In the process, the flow directions are opposite, so that the axial force caused by the crude methanol liquid on the rotating shaft 2 is self-balanced, thereby avoiding damage to the bearings of the turbine shaft due to pressure fluctuations, and even causing the entire methanol synthesis system to shut down or leak. Technical problems.

[0057] Optionally, the liquid inlet flow channel 13 described in the present invention is arranged between the first volute flow channel 11 and the second volute flow channel 12 .

[0058] In this embodiment, the liquid inlet channel 13 is arranged between the first volute channel 11 and the second volute channel 12, so that the length of the crude methanol liquid entering the first volute channel 11 and the second volute channel 12 through the liquid inlet channel 13 is similar, so that the pressure and flow rate when entering the first volute channel 11 and the second volute channel 12 are close, further ensuring that the axial force caused by the crude methanol liquid on the rotating shaft 2 can be self-balanced, avoiding damage to the bearings of the turbine shaft due to pressure fluctuations, and even causing technical problems such as shutdown or leakage of the entire methanol synthesis system.

[0059] Optionally, refer to Figure 5 The main body 1 described in the present invention includes a driving side 16 and a non-driving side 17 that are opposite to each other in a first direction 3; the rotating shaft 2 extends from the driving side 16 and the non-driving side 17; one end of the rotating shaft 2 extending from the driving side 16 is a driving end 23, and the driving end 23 is provided with a coupling 231 for connecting to a power generation device; one end of the rotating shaft 2 extending from the non-driving side 17 is a non-driving end 24, and the non-driving end 24 is provided with a speed measuring disc 241.

[0060] In this embodiment, the driving end 23 of the rotating shaft 2 is provided with a coupling 231, which is connected to a power generation device, such as a generator, through the coupling 231, so as to achieve the effect of converting the pressure energy of the crude methanol liquid into electrical energy through the hydraulic turbine; the non-driving end 24 is provided with a speed measuring disk 241, and the speed measuring disk 241 is used to detect the rotation speed of the rotating shaft 2 during the use of the hydraulic turbine, so as to monitor the working status of the hydraulic turbine in real time, so as to facilitate the staff to adjust the hydraulic turbine and the synthesis system using the hydraulic turbine.

[0061] Optionally, refer to Figure 6 The main body 1 described in the present invention is also provided with a pressure reducing chamber 18, which is arranged inside the main body 1; the pressure reducing chamber 18 is connected to the first volute flow channel 11, the second volute flow channel 12 and the liquid outlet flow channel 14.

[0062] In this embodiment, through the pressure reducing chamber 18 built into the main body 1, the pressure of the crude methanol liquid at the outlet of the first volute flow channel 11 and the second volute flow channel 12 is reduced to the pressure of the liquid outlet flow channel 14, thereby ensuring the sealing performance during use. At the same time, the built-in pressure reducing chamber 18 does not require external pipelines, reducing the risk of leakage caused by multiple external pipelines.

[0063] Optionally, a one-way valve is provided between the pressure reducing chamber 18 and the liquid outlet channel 14 described in the present invention.

[0064] In this embodiment, a one-way valve is provided between the pressure reducing chamber 18 and the liquid outlet channel 14 to prevent liquid and gas from flowing back. At the same time, it can discharge dangerous gases such as hydrogen in the crude methanol liquid, thereby improving safety.

[0065] Second, refer to Figure 7 The present invention also provides a methanol synthesis system, comprising a synthesis tower 4, a separator 5, an expansion tank 6 and any one of the above hydraulic turbines 7;

[0066] Among them, the input end of the separator 5 is connected to the output end of the synthesis tower 5; the liquid inlet flow channel of the hydraulic turbine 7 is connected to the output end of the separator 5; and the liquid outlet flow channel of the hydraulic turbine 7 is connected to the expansion tank 6.

[0067] In the present embodiment, a methanol synthesis system is provided, in which the hydraulic turbine 7 in the aforementioned embodiment is connected in series between the separator 5 and the expansion tank 6, so that the pressure energy of the crude methanol liquid is recovered and utilized, thereby achieving good energy-saving effects and avoiding technical problems such as crude pressure fluctuations caused by the generation of wax particles in the crude methanol liquid, unstable axial force of the shaft of the hydraulic turbine 7, damage to the bearings of the turbine shaft, and even shutdown or leakage of the entire methanol synthesis system.

[0068] It should be noted that the hydraulic turbine described in this embodiment has the same structure as the hydraulic turbines in the above embodiments, and its beneficial effects are also similar, which will not be described in detail here.

[0069] Optionally, the methanol synthesis system described in the present invention further includes a parallel pipeline 8 , which is connected to the output end of the separator 5 and the expansion tank 6 .

[0070] In this embodiment, a parallel pipeline 8 is provided to connect the output end of the separator 5 and the expansion tank 6, thereby playing a backup role and ensuring that the methanol synthesis system will not be forced to stop when the hydraulic turbine 7 fails or needs maintenance.

[0071] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0072] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A hydraulic turbine for methanol production, characterized in that: The hydraulic turbine comprises a main body (1) and a rotating shaft (2); The main body (1) is provided with a first volute flow channel (11) and a second volute flow channel (12) which are arranged in sequence along a first direction (3); The rotating shaft (2) passes through the first volute flow channel (11) and the second volute flow channel (12) along the first direction (3); an impeller assembly is arranged on the rotating shaft (2), a part of the impeller assembly is arranged in the first volute flow channel (11), and another part of the impeller assembly is arranged in the second volute flow channel (12); The main body (1) is provided with a liquid inlet flow channel (13) and a liquid outlet flow channel (14), and the liquid inlet flow channel (13) and the liquid outlet flow channel (14) are both connected to the first volute flow channel (11) and the second volute flow channel (12); In the first volute flow channel (11) and the second volute flow channel (12), the flow directions of the crude methanol liquid in the first direction (3) are opposite, and the impact force applied by the crude methanol liquid to the impeller assembly is in the same direction in the circumferential direction of the rotating shaft (2).

2. The hydraulic turbine according to claim 1, characterized in that: A spacing section (15) is provided between the first volute flow channel (11) and the second volute flow channel (12); The portion of the impeller group within the first volute flow channel (11) is a first impeller group (21), and the portion of the impeller group within the second volute flow channel (12) is a second impeller group (22); the first impeller group (21) and the second impeller group (22) are symmetrically arranged with respect to the spacing section (15).

3. The hydraulic turbine according to claim 2, characterized in that: The first impeller assembly (21) comprises a plurality of first impellers (211), and the plurality of first impellers (211) are arranged in sequence on the rotating shaft (2) along the first direction (3); A plurality of first partitions (111) are provided in the first volute flow channel (11); one first partition (111) is inserted between any two adjacent first impellers (211); The second impeller assembly (22) comprises a plurality of second impellers (221), and the plurality of second impellers (221) are arranged in sequence on the rotating shaft (2) along the first direction (3); A plurality of second partitions (121) are provided in the second volute flow passage (12); one second partition (121) is inserted between any two adjacent second impellers (221).

4. The hydraulic turbine according to claim 1, characterized in that: The first volute flow channel (11) comprises a first inlet (112) and a first outlet (113); the first inlet (112) is arranged close to the second volute flow channel (12), and the first outlet (113) is arranged away from the second volute flow channel (12); The second volute flow channel (12) comprises a second inlet (122) and a second outlet (123); the second inlet (122) is arranged close to the first volute flow channel (11), and the second outlet (123) is arranged away from the first volute flow channel (11); The first inlet (112) and the second inlet (122) are both connected to the liquid inlet channel (13); The first outlet (113) and the second outlet (123) are both connected to the liquid outlet channel (14).

5. The hydraulic turbine according to claim 1, characterized in that: The liquid inlet flow channel (13) is arranged between the first volute flow channel (11) and the second volute flow channel (12).

6. The hydraulic turbine according to claim 1, characterized in that: The main body (1) comprises a driving side (16) and a non-driving side (17) which are opposite to each other in the first direction (3); the rotating shaft (2) extends from the driving side (16) and the non-driving side (17); One end of the rotating shaft (2) extending out of the driving side (16) is a driving end (23), and the driving end (23) is provided with a coupling for connecting to a power generation device; One end of the rotating shaft (2) extending out of the non-driving side (17) is a non-driving end (24), and a speed measuring disc is provided on the non-driving end (24).

7. The hydraulic turbine according to claim 6, characterized in that: The main body (1) is also provided with a pressure reducing chamber (18), and the pressure reducing chamber (18) is arranged inside the main body (1); the pressure reducing chamber (18) is connected to the first volute flow channel (11), the second volute flow channel (12) and the liquid outlet flow channel (14).

8. The hydraulic turbine according to claim 7, characterized in that: A one-way valve is provided between the pressure-reducing chamber (18) and the liquid outlet channel (14).

9. A methanol synthesis system, characterized in that: The methanol synthesis system comprises a synthesis tower (4), a separator (5), an expansion tank (6) and a hydraulic turbine (7) according to any one of claims 1 to 8; wherein the input end of the separator (5) is connected to the output end of the synthesis tower (4); The liquid inlet passage (13) of the hydraulic turbine (7) is in communication with the output end of the separator (5); The liquid outlet passage (14) of the hydraulic turbine (7) is in communication with the expansion tank (6).

10. The methanol synthesis system according to claim 9, characterized in that: It also comprises a parallel pipeline (8), wherein the parallel pipeline (8) is connected to the output end of the separator (5) and the expansion tank (6).

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