Green Methanol Production System

Abstract

This application provides a green methanol production system, relating to the field of clean energy technology. The green methanol production system includes: a conversion unit, a first pipeline, and a second pipeline; the conversion unit is provided with a feed gas inlet; the first pipeline has a first inlet end and a first outlet end, the first inlet end being used for natural gas input, and the first outlet end being connected to the feed gas inlet end; the first pipeline is provided with a first branch pipe, the connection point of the first branch pipe to the first pipeline being located in the middle section of the first pipeline, or in the downstream section between the middle section and the first outlet end; the second pipeline has a second inlet end and a second outlet end, the second inlet end being used for biogas input, and the second outlet end being connected to the first branch pipe. This solves the technical problem that, due to the pressure mismatch between biogas and natural gas, biogas cannot smoothly enter the biogas pipeline when it is connected to the natural gas pipeline as feed gas, and even if biogas does enter and mix with natural gas, its stability is poor, affecting the smooth and stable production of green methanol.

Description

Technical Field

[0001] This application relates to the field of clean energy technology, and in particular to a system for producing green methanol. Background Technology

[0002] Traditional methanol production relies on fossil fuels as raw materials, which not only consumes a large amount of non-renewable resources but also results in high carbon emissions. With the increasing global demand for sustainable energy, green methanol, as a low-carbon or zero-carbon emission alternative fuel, is of great significance for reducing greenhouse gas emissions.

[0003] Biogas, as a clean gaseous energy source from renewable biomass, has promising applications in the production of green methanol. However, during the production of green methanol, the mismatch between the pressures of biogas and natural gas causes biogas to fail to enter smoothly when the biogas pipeline is connected to the natural gas pipeline as a raw material. Even if biogas does enter and mix with natural gas, its stability is poor, affecting the smooth and stable production of green methanol.

[0004] Therefore, the above problems urgently need to be solved. Utility Model Content

[0005] The purpose of this application is to provide a green methanol production system that solves the technical problems of biogas not being able to enter smoothly and the biogas being unstable after being mixed with natural gas, due to the pressure mismatch between biogas and natural gas, which affects the smooth and stable production of green methanol.

[0006] The technical solution is as follows:

[0007] This application provides a green methanol production system, comprising:

[0008] The conversion unit is equipped with a raw material gas inlet;

[0009] The first pipeline has a first inlet end and a first outlet end. The first inlet end is used for natural gas input, and the first outlet end is connected to the raw material gas inlet. The first pipeline is provided with a first branch pipe, and the connection position of the first branch pipe to the first pipeline is located in the middle section of the first pipeline or in the downstream section between the middle section and the first outlet end.

[0010] The second pipe has a second air inlet and a second air outlet. The second air inlet is used for biogas input, and the second air outlet is connected to the first branch pipe.

[0011] In some embodiments, the aforementioned green methanol production system includes a first check valve on the first pipeline, which is located between the connection point of the first branch pipe and the first pipeline and the first air inlet.

[0012] In some embodiments, the aforementioned green methanol production system further includes a regulating valve on the first pipeline, the regulating valve being closer to the first outlet end relative to the first check valve, and the connection point between the first branch pipe and the first pipeline being located between the first check valve and the regulating valve.

[0013] In some embodiments, the aforementioned green methanol production system includes a second pipeline comprising a target pipe section and a reducing pipe section connected together, a second inlet end being disposed at the end of the target pipe section away from the reducing pipe section, and the end of the reducing pipe section away from the target pipe section being connected to a second outlet end; the nominal diameter of the first branch pipe is smaller than that of the first pipeline, and the nominal diameter of the target pipe section is larger than that of the first branch pipe.

[0014] In some embodiments, the aforementioned green methanol production system includes a first shut-off valve and a second shut-off valve spaced apart on a first branch pipe, a second gas outlet connected between the first shut-off valve and the second shut-off valve, and the first shut-off valve being closer to the first pipe than the second shut-off valve.

[0015] In some embodiments, the aforementioned green methanol production system includes a second check valve installed on the target pipeline section.

[0016] In some embodiments, the aforementioned green methanol production system further includes a gate valve on the target pipe section, the gate valve being located near the reducing pipe relative to the second check valve.

[0017] In some embodiments, the aforementioned green methanol production system includes a target pipe segment connected to a second branch pipe, wherein the connection point between the second branch pipe and the target pipe segment is located between the gate valve and the second check valve.

[0018] In some embodiments, the aforementioned green methanol production system includes a third shut-off valve on the second branch pipe.

[0019] In some embodiments, the aforementioned green methanol production system further includes: a pressure reducing skid, which is provided with a biogas inlet and a biogas outlet, the biogas outlet being connected to a second air inlet; the pressure reducing skid can reduce the pressure of the biogas entering through the biogas inlet and output it to a second pipeline through the biogas outlet and the second air inlet.

[0020] Through the above technical solution, this utility model has at least the following advantages:

[0021] This application provides a green methanol production system, including: a conversion unit, a first pipeline, and a second pipeline; the conversion unit is provided with a raw material gas inlet; the first pipeline has a first inlet end and a first outlet end, the first inlet end is used for natural gas input, the first outlet end is connected to the raw material gas inlet end, the first pipeline is provided with a first branch pipe, the connection position of the first branch pipe to the first pipeline is located in the middle section of the first pipeline, or in the downstream section between the middle section and the first outlet end; the second pipeline has a second inlet end and a second outlet end, the second inlet end is used for biogas input, and the second outlet end is connected to the first branch pipe. This application establishes a first branch pipe on the first pipeline, forming a transition zone between the first and second pipelines for biogas access. This allows the biogas to gradually adapt to the pressure environment within the first pipeline before mixing with natural gas, achieving a smooth pressure transition. It also avoids impacting the natural gas transport within the first pipeline or causing localized flow field disturbances when biogas is directly accessed, improving mixing uniformity and ensuring the safe and stable production of green methanol using the mixed gas as feedstock. Furthermore, the connection point between the first branch pipe and the first pipeline is located in the middle section of the first pipeline or downstream of the middle section between the first outlet and the first gas outlet. Since the natural gas pressure at the connection point between the first branch pipe and the first pipeline in the middle or downstream section is relatively lower than that at the first gas inlet, this effectively reduces the driving pressure difference required for biogas to enter the first pipeline. This facilitates controlling the input pressure of biogas within a reasonable range, reducing the risk of biogas backflow or reverse flow, and ensuring that biogas can smoothly and stably enter the first pipeline. This application solves the technical problem that, due to the pressure mismatch between biogas and natural gas, biogas cannot enter smoothly when connected to a natural gas pipeline as raw material, and even if it does enter and mix with natural gas, its stability is poor, thus affecting the smooth and stable production of green methanol.

[0022] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, the preferred embodiments of this application are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A schematic diagram of a green methanol production system provided in this application is shown.

[0025] Figure 2A schematic diagram of another green methanol production system provided in this application is shown.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Conversion unit; 11. Raw material gas inlet;

[0028] 2. First pipeline; 21. First air inlet; 22. First air outlet; 23. First branch pipe; 24. First check valve; 25. Regulating valve; 231. First shut-off valve; 232. Second shut-off valve;

[0029] 3. Second pipeline; 31. Second air inlet; 32. Second air outlet; 33. Target pipe section; 34. Reducing pipe fitting; 331. Second check valve; 332. Gate valve; 333. Second branch pipe; 3331. Third shut-off valve;

[0030] 4. Pressure relief skid; 41. Biogas inlet; 42. Biogas outlet. Detailed Implementation

[0031] The embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of this disclosure by way of example, but should not be used to limit the scope of this disclosure. This disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0032] These embodiments are provided to make the disclosure thorough and complete, and to fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as exemplary only and not as limiting.

[0033] It should be noted that, in the description of this disclosure, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationship, are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0034] Furthermore, the terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the permissible margin of error. "Parallel" is not strictly parallel, but within the permissible margin of error. Terms such as "including" or "contains" mean that the element preceding the word encompasses the element listed after the word, and do not exclude the possibility of encompassing other elements as well.

[0035] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure depending on the specific circumstances. When a particular device is described as being located between a first device and a second device, an intermediary device may or may not be present between the particular device and the first or second device.

[0036] All terms used in this disclosure have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0037] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0038] like Figure 1 As shown, this application provides a green methanol production system, including: a conversion unit 1, a first pipeline 2, and a second pipeline 3; the conversion unit 1 is provided with a raw material gas inlet 11; the first pipeline 2 has a first inlet end 21 and a first outlet end 22, the first inlet end 21 is used for natural gas input, the first outlet end 22 is connected to the raw material gas inlet 11, the first pipeline 2 is provided with a first branch pipe 23, the connection position of the first branch pipe 23 and the first pipeline 2 is located in the middle section of the first pipeline 2, or in the downstream section between the middle section and the first outlet end 22; the second pipeline 3 has a second inlet end 31 and a second outlet end 32, the second inlet end 31 is used for biogas input, and the second outlet end 32 is connected to the first branch pipe 23.

[0039] Specifically, the green methanol production system provided in this application includes a conversion unit 1. The conversion unit 1 can convert biogas into a syngas containing carbon monoxide and hydrogen, which can be used to synthesize methanol, through a mixer connected to natural gas. In one embodiment, the conversion unit 1 may include a hydrodesulfurization unit, a saturation tower, a pre-conversion furnace, a conversion furnace, a waste heat boiler, and a conversion gas waste heat recovery unit arranged sequentially. The hydrodesulfurization unit is used to remove sulfur from the feed gas. The saturation tower is used to generate process steam and recover methanol from the distillation wastewater. The pre-conversion furnace is used to decompose heavy hydrocarbon components in the feed gas. The conversion furnace converts the feed gas into a mixture of carbon monoxide, carbon dioxide, hydrogen, and methane. The waste heat boiler uses a natural circulation system to generate high-pressure steam to drive the syngas compressor turbine. The conversion gas waste heat recovery unit heats other media through conversion gas waste heat recovery and simultaneously reduces the temperature of the gas entering the compressor to within the compressor's allowable range.

[0040] In one embodiment, the aforementioned hydrodesulfurization unit may include a natural gas separator, a hydrodesulfurization reactor, a zinc oxide desulfurization tank, a desulfurization intermediate heat exchanger, and an ultrafine desulfurization tank. The natural gas separator may be provided with a raw gas inlet 11 to receive a mixture of biogas and natural gas. Before the subsequent hydrodesulfurization reaction, the natural gas separator uses gravity settling or cyclone separation principles to remove free water, oil, or other high-boiling-point hydrocarbons from the mixture. At the same time, it removes impurities such as particulate matter, dust, and microbial residues carried in the mixture, thereby creating favorable conditions for the subsequent hydrodesulfurization reaction.

[0041] The green methanol system of this application may also include a compression unit with a compressor unit, a circulating machine, etc., a synthesis unit including a methanol synthesis tower, a distillation unit including a distillation tower, a pressure swing adsorption unit, a tank area unit, etc., all of which are required to realize the green methanol production process, and will not be described in detail here.

[0042] The green methanol system of this application is provided with a first pipeline 2, which has a first inlet end 21 and a first outlet end 22. The first inlet end 21 is used for natural gas input, and the first outlet end 22 is connected to the raw material gas inlet 11. The first pipeline 2 is provided with a first branch pipe 23, which is used to connect the biogas transported by the second pipeline 3 into the first pipeline 2 to form a mixture of biogas and natural gas, which is used as the raw material gas for subsequent processes.

[0043] The connection point between the first branch pipe 23 and the first pipeline 2 is located in the middle section of the first pipeline 2, or in the downstream section between the middle section and the first gas outlet 22. The natural gas pressure at the connection point between the first branch pipe 23 and the first pipeline 2 in the middle or downstream section is relatively lower than that when the first gas inlet 21 is input. This effectively reduces the driving pressure difference required when biogas is transported into the first pipeline 2, making it easier to control the input pressure of biogas within a reasonable range, reducing the risk of biogas backflow or reverse flow, and ensuring that biogas can smoothly and stably enter the first pipeline 2.

[0044] This application establishes a first branch pipe 23 on the first pipeline 2, forming a transition zone between the first pipeline 2 and the second pipeline 3 for biogas access. This allows the biogas to gradually adapt to the pressure environment within the first pipeline 2 before mixing with natural gas, achieving a smooth pressure transition. Furthermore, it avoids impacting the natural gas transport within the first pipeline 2 or causing localized flow field disturbances when biogas is directly accessed, improving mixing uniformity and ensuring the safe and stable production of green methanol using the mixed gas as feedstock. To further precisely control the biogas input rate, the first branch pipe 23 can also be equipped with regulating elements, flow control devices, etc., with no specific limitations.

[0045] The green methanol system of this application is equipped with a second pipeline 3, which has a second inlet end 31 and a second outlet end 32. The second inlet end 31 is used for biogas input, and the second outlet end 32 is connected to the first branch pipe 23. The second inlet end 31 can be connected to a biogas storage tank, a biogas purification system, or a biogas compression station to achieve biogas supply. Alternatively, biogas can be transported through a high-pressure pipeline truck, and a pressure reducing device can be installed to connect to the high-pressure pipeline truck to output the pressure-reduced biogas to the second pipeline 3. The specific configuration is not limited, as long as a stable biogas supply can be achieved.

[0046] This application provides a green methanol production system, including: a conversion unit 1, a first pipeline 2, and a second pipeline 3; the conversion unit 1 is provided with a raw material gas inlet 11; the first pipeline 2 has a first inlet end 21 and a first outlet end 22, the first inlet end 21 is used for natural gas input, the first outlet end 22 is connected to the raw material gas inlet 11, the first pipeline 2 is provided with a first branch pipe 23, the connection position of the first branch pipe 23 and the first pipeline 2 is located in the middle section of the first pipeline 2, or in the downstream section between the middle section and the first outlet end 22; the second pipeline 3 has a second inlet end 31 and a second outlet end 32, the second inlet end 31 is used for biogas input, and the second outlet end 32 is connected to the first branch pipe 23. This application establishes a first branch pipe 23 on the first pipeline 2, forming a transition zone for biogas access between the first pipeline 2 and the second pipeline 3. This allows the biogas to gradually adapt to the pressure environment within the first pipeline 2 before mixing with natural gas, achieving a smooth pressure transition. It also avoids impacting the natural gas transport within the first pipeline 2 or causing local flow field disturbances when biogas is directly accessed, improving mixing uniformity and ensuring the safe and stable production of green methanol using the mixed gas as feedstock. Furthermore, the connection point between the first branch pipe 23 and the first pipeline 2 is located in the middle section of the first pipeline 2, or downstream of the middle section and the first outlet 22. Since the natural gas pressure at the connection point between the first branch pipe 23 and the first pipeline 2 is relatively lower than that at the first inlet 21, this effectively reduces the driving pressure difference required for biogas to enter the first pipeline 2. This facilitates controlling the input pressure of biogas within a reasonable range, reducing the risk of biogas backflow or reverse flow, and ensuring that biogas can smoothly and stably enter the first pipeline 2. This application solves the technical problem that, due to the pressure mismatch between biogas and natural gas, biogas cannot enter smoothly when connected to a natural gas pipeline as raw material, and even if it does enter and mix with natural gas, its stability is poor, thus affecting the smooth and stable production of green methanol.

[0047] like Figure 1 As shown, in some embodiments, a first check valve 24 is provided on the first pipe 2, and the first check valve 24 is located between the connection position of the first branch pipe 23 and the first pipe 2 and the first air inlet 21.

[0048] Specifically, this application provides a first check valve 24 on the first pipeline 2, and the first check valve 24 is located between the connection position of the first branch pipe 23 and the first pipeline 2 and the first air inlet 21. By utilizing the characteristic of the first check valve 24 that it only allows flow in one direction and prevents reverse flow, it prevents the high-pressure natural gas in the first pipeline 2 from backflowing or flowing backward, thereby enhancing the safety and stability of the green methanol production system.

[0049] like Figure 1As shown, in some embodiments, a regulating valve 25 is also provided on the first pipeline 2. The regulating valve 25 is close to the first outlet end 22 relative to the first check valve 24. The connection position of the first branch pipe 23 and the first pipeline 2 is located between the first check valve 24 and the regulating valve 25.

[0050] Specifically, this application incorporates a regulating valve 25 located downstream of the connection point between the first pipeline 2 and the first branch pipe 23 to control the pressure and flow rate of the biogas and natural gas mixture. This dynamic regulation of the mixture ensures the quality and stability of the mixture entering the raw material gas inlet 11. Furthermore, the regulating valve 25 works in conjunction with the first check valve 24 to maintain a balanced flow of pressure within the first pipeline 2, enhancing the safety and stability of the transport process. The regulating valve 25 can be integrated with an automated control system, automatically adjusting the valve opening based on real-time monitoring data, reducing the need for manual intervention, enhancing system response speed and accuracy, and improving production efficiency.

[0051] like Figure 1 As shown, in some embodiments, the second pipe 3 includes a target pipe section 33 and a reducing pipe fitting 34 connected together. The second air inlet 31 is disposed at the end of the target pipe section 33 away from the reducing pipe fitting 34, and the end of the reducing pipe fitting 34 away from the target pipe section 33 is connected to the second air outlet 32. The nominal diameter of the first branch pipe 23 is smaller than that of the first pipe 2, and the nominal diameter of the target pipe section 33 is larger than that of the first branch pipe 23.

[0052] Specifically, the second pipeline 3 of this application includes a target pipe section 33 and a reducing pipe fitting 34 connected to each other. The second inlet end 31 is located at the end of the target pipe section 33 away from the reducing pipe fitting 34 to enable biogas to be input into the target pipe section 33. By setting the nominal diameter of the target pipe section 33 to be larger than the nominal diameter of the first branch pipe 23, the pressure loss caused by friction during biogas transportation is reduced, thereby improving transportation efficiency. In order to ensure that biogas can be smoothly input from the target pipe section 33 into the first branch pipe 23, this application provides a reducing pipe fitting 34 to avoid turbulence or pressure fluctuations caused by sudden changes in pipe diameter. The reducing pipe fitting 34 can be a concentric reducing pipe or an eccentric reducing pipe, etc., and is not limited to any specific type. Under the action of the reducing pipe fitting 34, the biogas gradually accelerates before being output from the target pipe section 33 into the first branch pipe 23, enhancing the subsequent mixing effect with natural gas and ensuring the stability and efficiency of the green methanol production system.

[0053] like Figure 1 As shown, in some embodiments, a first shut-off valve 231 and a second shut-off valve 232 are provided at intervals on the first branch pipe 23, and the second air outlet 32 ​​is connected between the first shut-off valve 231 and the second shut-off valve 232. The first shut-off valve 231 is closer to the first pipe 2 than the second shut-off valve 232.

[0054] Specifically, this application provides a first shut-off valve 231 and a second shut-off valve 232 at intervals on the first branch pipe 23. A shut-off valve is a valve used to control the flow of fluid. The flow of fluid is controlled by opening or closing the valve. This application uses a double shut-off valve design, and the second gas outlet 32 ​​is connected between the first shut-off valve 231 and the second shut-off valve 232 to provide a double isolation function, forming a double barrier to prevent gas leakage. Moreover, the design and operation of the double shut-off valve allows for precise control and regulation of biogas input, improving the controllability of the system and adapting to different production needs and operating conditions. Furthermore, the design of the double shut-off valve simplifies the maintenance and repair process of the system. During the maintenance of the second pipeline 3, the second pipeline 3 can be isolated from the first pipeline 2, facilitating maintenance operations.

[0055] In one embodiment, the first branch pipe 23 of this application is provided with a first shut-off valve 231 and a second shut-off valve 232 at intervals, so that the first branch pipe 23 can be used as a drainage pipe on the first pipeline 2. When biogas is not connected, the drainage pipe can be used to discharge condensate, impurities or to purge the pipeline. By using the drainage pipe on the first pipeline 2 as a biogas access path, this application realizes the reuse of the original drainage pipe, avoids additional openings or new interfaces on the first pipeline 2, reduces construction difficulty and cost, and the first branch pipe 23 can still perform its drainage function when biogas is not connected, thus improving the system's multifunctionality and economy.

[0056] like Figure 1 As shown, in some embodiments, a second check valve 331 is provided on the target pipe segment 33.

[0057] Specifically, this application provides a second check valve 331 on the target pipe section 33. Utilizing the characteristic of the first check valve 24, which allows flow in only one direction and prevents reverse flow, this prevents backflow or countercurrent of biogas within the target pipe section 33, ensuring a stable flow of biogas from the second inlet 31 to the first branch pipe 23, thus improving system safety and stability. Furthermore, the second check valve 331 allows for isolation of the biogas from the first branch pipe 23 by closing it when maintenance of the second pipeline 3 is required, facilitating maintenance and repair.

[0058] like Figure 1 As shown, in some embodiments, a gate valve 332 is also provided on the target pipe section 33, and the gate valve 332 is close to the reducing pipe fitting 34 relative to the second check valve 331.

[0059] Specifically, this application also provides a gate valve 332 on the target pipe section 33, so that the flow of biogas in the target pipe section 33 can be controlled manually or automatically through the gate valve 332. Furthermore, by adjusting the opening of the gate valve 332, the biogas input can be adjusted, thereby improving the controllability of the system and meeting different production needs and operating conditions. At the same time, the gate valve 332 works in conjunction with the second check valve 331 to provide dual protection for the output of biogas and improve the reliability of biogas supply.

[0060] like Figure 1 As shown, in some embodiments, the target pipe segment 33 is connected to a second branch pipe 333, and the connection position between the second branch pipe 333 and the target pipe segment 33 is located between the gate valve 332 and the second check valve 331.

[0061] Specifically, this application connects a second branch pipe 333 to the target pipe section 33. The second branch pipe 333 provides multiple functional interfaces for the target pipe section 33 to enhance the flexibility of the system. The second branch pipe 333 can be used to discharge condensate, impurities, or purge the pipeline. It can also support gas sampling to facilitate the detection of the gas composition and quality of biogas in the target pipe section 33. Furthermore, as needed, the second branch pipe 333 can also enable the target pipe section 33 to quickly discharge biogas to reduce pressure and improve the emergency response capability and reliability of the system.

[0062] like Figure 1 As shown, in some embodiments, a third shut-off valve 3331 is provided on the second branch pipe 333.

[0063] Specifically, in order to provide an additional isolation barrier for the second branch pipe 333 and achieve precise flow control to improve the maintainability of the second branch pipe 333 under different operating requirements, this application provides a third shut-off valve 3331 on the second branch pipe 333 to control the flow state of the second branch pipe 333 by manually or automatically controlling the third shut-off valve 3331.

[0064] like Figure 2 As shown, in some embodiments, it also includes: a pressure reducing skid 4, which is provided with a biogas inlet 41 and a biogas outlet 42, the biogas outlet 42 being connected to a second air inlet 31; the pressure reducing skid 4 can reduce the pressure of the biogas entering through the biogas inlet 41 and output it to the second pipeline 3 through the biogas outlet 42 and the second air inlet 31.

[0065] Specifically, to reduce the pressure of biogas from different sources, such as biogas storage tanks, biogas purification systems, biogas compression stations, and high-pressure pipeline trucks, to a pressure level suitable for the second pipeline 3, the green methanol system of this application is also equipped with a pressure reducing skid 4. The pressure reducing skid 4 can precisely control the pressure of the output biogas to meet different process requirements, ensuring that the biogas can be smoothly connected to the first branch pipe 23 through the second pipeline 3 and used as feedstock after mixing with natural gas. The pressure reducing skid 4 can be equipped with a pressure reducing valve or a pressure reducing valve group to control the biogas pressure entering through the biogas inlet 41. It can also be equipped with a pressure sensor to monitor the pressure of the biogas outlet 42 in real time. Alternatively, a control system can be configured in conjunction with the pressure sensor to achieve automatic adjustment without manual intervention, reducing the difficulty of operation and maintenance costs. Furthermore, the biogas inlet 41 of the pressure reducing skid 4 is not limited to one; multiple sets of equipment or high-pressure pipeline trucks can be connected to achieve biogas supply. The biogas outlet 42 is also not limited to one; it is not specific and can be adjusted adaptively according to the biogas supply needs.

[0066] The embodiments of this disclosure have now been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0067] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner.

Claims

1. A green methanol system, characterized in that, include: The conversion unit is provided with a raw material gas inlet; The first pipeline has a first inlet end and a first outlet end. The first inlet end is used for natural gas input, and the first outlet end is connected to the raw material gas inlet. The first pipeline is provided with a first branch pipe, and the connection position of the first branch pipe to the first pipeline is located in the middle section of the first pipeline or in the downstream section between the middle section and the first outlet end. The second pipe has a second air inlet and a second air outlet. The second air inlet is used for biogas input, and the second air outlet is connected to the first branch pipe.

2. The green methanol production system according to claim 1, characterized in that, A first check valve is installed on the first pipeline, and the first check valve is located between the connection position of the first branch pipe and the first pipeline and the first air inlet.

3. The green methanol production system according to claim 2, characterized in that, The first pipeline is also equipped with a regulating valve, which is located near the first outlet end relative to the first check valve. The connection point between the first branch pipe and the first pipeline is located between the first check valve and the regulating valve.

4. The green methanol production system according to claim 1, characterized in that, The second pipeline includes a target pipe section and a reducing pipe fitting connected to each other. The second air inlet is located at the end of the target pipe section away from the reducing pipe fitting, and the end of the reducing pipe fitting away from the target pipe section is connected to the second air outlet. The nominal diameter of the first branch pipe is smaller than that of the first pipe, and the nominal diameter of the target pipe section is larger than that of the first branch pipe.

5. The green methanol production system according to claim 4, characterized in that, A first shut-off valve and a second shut-off valve are provided at intervals on the first branch pipe. The second air outlet is connected between the first shut-off valve and the second shut-off valve. The first shut-off valve is closer to the first pipe than the second shut-off valve.

6. The green methanol production system according to claim 4, characterized in that, A second check valve is installed on the target pipe section.

7. The green methanol production system according to claim 6, characterized in that, A gate valve is also installed on the target pipe section, and the gate valve is located near the reducing pipe fitting relative to the second check valve.

8. The green methanol production system according to claim 7, characterized in that, The target pipe section is connected to a second branch pipe, and the connection point between the second branch pipe and the target pipe section is located between the gate valve and the second check valve.

9. The green methanol production system according to claim 8, characterized in that, A third shut-off valve is installed on the second branch pipe.

10. The system for making green methanol of claim 1, wherein, Also includes: A pressure-reducing skid, which is provided with a biogas inlet and a biogas outlet, the biogas outlet being connected to the second air inlet; The pressure-reducing skid can reduce the pressure of the biogas entering through the biogas inlet and output it to the second pipeline through the biogas outlet and the second air inlet.

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