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 fuel gas system, a first pipeline, and a second pipeline; the fuel gas system has a fuel 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 fuel gas inlet end; the first pipeline has 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 natural gas pipeline during the process of connecting the biogas pipeline to the natural gas pipeline as fuel gas, and even if biogas does enter, its stability after mixing with natural gas is poor, affecting combustion efficiency and the safe 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] In the process of preparing green methanol, material reactions and equipment operation all require fuel gas as a heat source. Biogas, as a clean gas energy source of renewable biomass, can provide heat energy as fuel gas in the preparation of green methanol. However, due to the pressure mismatch between biogas and natural gas, when biogas pipelines are connected to natural gas pipelines as fuel gas, biogas cannot enter smoothly. Even if biogas enters and mixes with natural gas, its stability is poor, affecting combustion efficiency and the safe 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 poor stability of biogas after mixing with natural gas, which affect combustion efficiency and the safe and stable production of green methanol, due to the pressure mismatch between biogas and natural gas.

[0006] The technical solution is as follows:

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

[0008] Fuel gas system, the fuel gas system is equipped with a fuel 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 a fuel 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 regulating valve assembly on the first pipeline, the regulating valve assembly being located in the middle section of the first pipeline or in the downstream section between the middle section and the first gas outlet; and a first branch pipe being located on the regulating valve assembly.

[0012] 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 regulating valve assembly than the second shut-off valve.

[0013] In some embodiments, the aforementioned green methanol production system further includes a third gas outlet in the second pipeline. The third gas outlet is used for biogas output and is connected to the first pipeline. The connection point between the third gas outlet and the first pipeline is located between the regulating valve assembly and the first gas outlet.

[0014] In some embodiments, the aforementioned green methanol production system includes a second pipeline comprising a target pipe section and a second branch pipe connected to each other. The target pipe section has a second inlet end and a third outlet end, and the end of the second branch pipe opposite to the target pipe section has a second outlet end.

[0015] In some embodiments, the aforementioned green methanol production system includes a first check valve and a first gate valve arranged sequentially near the third outlet end of the target pipe section, with the first gate valve being closer to the first pipe than the first check valve; and the first check valve being closer to the first pipe than the connection position between the second branch pipe and the target pipe section.

[0016] In some embodiments, the aforementioned green methanol production system includes a second branch pipe comprising a second check valve and a second gate valve connected to each other, with the second gate valve being closer to the first branch pipe than the second check valve.

[0017] In some embodiments, the aforementioned green methanol production system includes a target pipe segment connected to a third branch pipe, the connection point of the third branch pipe and the target pipe segment being located between the first gate valve and the first check valve, and a third shut-off valve being provided on the third branch pipe; a second branch pipe connected to a fourth branch pipe, the connection point of the fourth branch pipe and the second branch pipe being located between the second gate valve and the second check valve, and a fourth shut-off valve being provided on the fourth branch pipe.

[0018] In some embodiments, the aforementioned green methanol production system further includes a third check valve on the first pipeline, with the connection point between the third outlet and the first pipeline located between the regulating valve assembly and the third check valve.

[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, comprising: a fuel gas system, a first pipeline, and a second pipeline; the fuel gas system is provided with a fuel 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, the first outlet end being connected to the fuel gas inlet end, the first pipeline being provided with a first branch pipe, the connection position 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 application establishes a first branch pipe on the first pipeline, creating 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 introduced, improving mixing uniformity and ensuring the combustion efficiency of the mixed gas as fuel. 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 and the first outlet. Since the natural gas pressure at the connection point between the first branch pipe and the first pipeline is relatively lower than that at the first inlet, the driving pressure difference required for biogas to enter the first pipeline is effectively reduced. This facilitates controlling the biogas input pressure within a reasonable range, reducing the risk of biogas backflow or reverse flow, ensuring that biogas can smoothly and stably enter the first pipeline, guaranteeing the safe and stable supply of heat energy to the fuel gas system of the green methanol production system, and thus ensuring the safe and stable production of green methanol. This application solves the technical problems of biogas not being able to enter smoothly and the poor stability of biogas after mixing with natural gas, which are caused by the pressure mismatch between biogas and natural gas, affecting combustion efficiency and the safe 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 2 A 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. Fuel gas system; 11. Fuel gas inlet;

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

[0029] 3. Second pipe; 31. Second air inlet; 32. Second air outlet; 33. Third air outlet; 34. Target pipe section; 35. Second branch pipe; 36. Third branch pipe; 37. Fourth branch pipe; 341. First check valve; 342. First gate valve; 351. Second check valve; 352. Second gate valve; 361. Third shut-off valve; 371. Fourth 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, the first aspect of this application provides a green methanol production system, including a fuel gas system 1, a first pipeline 2, and a second pipeline 3; the fuel gas system 1 is provided with a fuel 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 fuel 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 fuel gas system 1. In the process of producing green methanol, the material reaction and equipment drive all require fuel gas in the fuel gas system 1 as a heat source. The fuel gas system 1 is equipped with a fuel gas inlet 11. As a clean gas energy source of renewable biomass, biogas can be used as fuel gas to provide heat energy in the process of producing green methanol. The green methanol production system provided in this application can realize the connection of biogas to natural gas to participate in the fuel gas system 1 as fuel gas, so as to give full play to the advantages of biogas as a clean gas energy source of renewable biomass and meet the development needs of green chemical industry.

[0040] 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 fuel 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 fuel gas required by the fuel gas system 1 to generate heat energy.

[0041] 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.

[0042] 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 combustion efficiency of the mixed gas as fuel. 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.

[0043] 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 as fuel gas. The specific configuration is not limited, as long as a stable biogas supply can be achieved.

[0044] The green methanol system of this application may also include a conversion unit for converting syngas into methanol, 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.

[0045] This application provides a green methanol production system, including: a fuel gas system 1, a first pipeline 2, and a second pipeline 3; the fuel gas system 1 is provided with a fuel 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 fuel 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 combustion efficiency of the mixed gas as fuel. 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, ensuring that biogas can smoothly and stably enter the first pipeline 2, guaranteeing the safe and stable supply of heat energy to the fuel gas system 1 of the green methanol production system, and thus ensuring the safe and stable production of green methanol. This application solves the technical problems of biogas not being able to enter smoothly and the poor stability of biogas after mixing with natural gas, which are caused by the pressure mismatch between biogas and natural gas, affecting combustion efficiency and the safe and stable production of green methanol.

[0046] like Figure 1 As shown, in some embodiments, a regulating valve assembly 24 is provided on the first pipeline 2, and the regulating valve assembly 24 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 first branch pipe 23 is provided on the regulating valve assembly 24.

[0047] Specifically, this application provides a regulating valve assembly 24 on the first pipeline 2. The regulating valve assembly 24 can adjust the pressure and flow rate of natural gas in real time during the transportation process, providing a more stable pressure environment for biogas access. In addition, the regulating valve assembly 24 has good regulating performance and fast response capability, and can dynamically adjust the flow rate of natural gas according to the biogas input, maintain the temperature of the total flow rate and calorific value of fuel gas, and improve the flexibility of the system.

[0048] This application sets the regulating valve assembly 24 in the middle section of the first pipeline 2, or in the downstream section between the middle section and the first gas outlet 22, and sets the first branch pipe 23 in the regulating valve assembly 24. Since the second gas outlet 32 ​​of the second pipeline 3 is connected to the first branch pipe 23, the first branch pipe 23 is located in the controllable area of ​​pressure regulation provided by the regulating valve assembly 24. In this area, the flow of natural gas is stable and the pressure fluctuation is small, so that biogas can flow into the first branch pipe 23 in a more uniform and controllable manner, improving the uniformity of mixing with natural gas, and ensuring combustion efficiency and production safety.

[0049] 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 regulating valve group 24 than the second shut-off valve 232.

[0050] Specifically, this application provides a first shut-off valve 231 and a second shut-off valve 232 on the first branch pipe 23. A shut-off valve is a valve used to control fluid flow. By opening or closing the valve, the flow of fluid is controlled. This application uses a double shut-off valve design, with the second gas outlet 32 ​​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. The double shut-off valve design allows for precise control and regulation of biogas input, improving system controllability and adapting to different production needs and operating conditions. Furthermore, the double shut-off valve design simplifies the system maintenance process. During maintenance of the second pipeline 3, the second pipeline 3 can be isolated from the first pipeline 2, facilitating maintenance operations.

[0051] 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 drain pipe provided on the regulating valve group 24. When biogas is not connected, the drain pipe can be used to discharge condensate, impurities or to purge the pipeline. This application realizes the reuse of the original drain pipe by using the drain pipe provided on the first pipe 2 as a biogas access passage, avoiding additional openings or new interfaces for the first pipe 2, reducing construction difficulty and cost. Moreover, the first branch pipe 23 can still perform its drain function when biogas is not connected, improving the multifunctionality and economy of the system.

[0052] like Figure 1 As shown, in some embodiments, the second pipe 3 also has a third gas outlet 33, which is used for biogas output and connected to the first pipe 2. The connection position of the third gas outlet 33 and the first pipe 2 is located between the regulating valve group 24 and the first gas outlet 22.

[0053] Specifically, this application adds a third gas outlet 33 to the second pipeline 3 and connects it between the first pipeline 2 and the first gas outlet 22. This allows biogas to enter the first pipeline 2 through both the second and third gas outlets 32 and 33, providing the system with more operational options and allowing for flexible adjustment of the biogas input path according to actual operating conditions. Furthermore, the third gas outlet 33 allows biogas to enter the first pipeline 2 from different locations, enabling flexible adjustment of the biogas input ratio at different outlets to meet the heat energy requirements under different operating conditions. Simultaneously, it allows for uniform mixing and distribution with the natural gas in the first pipeline 2, increasing fuel combustion efficiency and ensuring stable system operation.

[0054] With the regulating valve group 24 located in the middle or downstream section of the first pipeline 2, the pressure at the connection point between the third gas outlet 33 and the second pipeline 3 is even lower, further reducing the driving pressure difference required when biogas is transported into 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, ensuring that biogas can smoothly and stably enter the first pipeline 2, guaranteeing the safe and stable supply of heat energy to the fuel gas system 1 of the green methanol production system, and thus ensuring the safe and stable production of green methanol.

[0055] like Figure 1 As shown, in some embodiments, the second pipe 3 includes a target pipe section 34 and a second branch pipe 35 connected to each other. The target pipe section 34 has a second air inlet end 31 and a third air outlet end 33, and the second branch pipe 35 has a second air outlet end 32 at the end opposite to the target pipe section 34.

[0056] Specifically, the second pipeline 3 of this application includes a target pipe section 34 and a second branch pipe 35 connected to each other. The target pipe section 34 has a second inlet end 31 and a third outlet end 33 to form a passage for biogas input into the first pipeline 2. The second branch pipe 35 has a second outlet end 32 at the end opposite to the target pipe section 34 to form another passage for biogas input into the first pipeline 2. The target pipe section 34 and the second branch pipe 35 provide two passages to meet the input requirements of biogas into the first pipeline 2, providing the system with more operational options and allowing flexible adjustment of the biogas input path according to actual operating conditions. Furthermore, when one path requires maintenance, the other path can continue to operate, ensuring continuous operation of the system and improving the reliability of fuel gas supply.

[0057] like Figure 1 As shown, in some embodiments, a first check valve 341 and a first gate valve 342 are sequentially arranged near the third outlet end 33 of the target pipe section 34, with the first gate valve 342 being closer to the first pipe 2 relative to the first check valve 341; the first check valve 341 is closer to the first pipe 2 relative to the connection position between the second branch pipe 35 and the target pipe section 34.

[0058] Specifically, this application sequentially installs a first check valve 341 and a first gate valve 342 near the third gas outlet 33 in the target pipe section 34. The first check valve 341 effectively prevents natural gas, or a mixture of biogas and natural gas, from flowing back into the target pipe section 34, avoiding biogas backflow caused by pressure fluctuations. The first gate valve 342 is located between the first check valve 341 and the third gas outlet 33, and can be manually closed to cut off the biogas flow path on the target pipe section 34 when needed. Furthermore, the opening degree of the first gate valve 342 can be adjusted to regulate the biogas flow rate within the target pipe section 34, ensuring that biogas smoothly enters the first pipeline 2 to mix as fuel gas.

[0059] like Figure 1 As shown, in some embodiments, the second branch pipe 35 includes a second check valve 351 and a second gate valve 352 connected to each other, with the second gate valve 352 being closer to the first branch pipe 23 relative to the second check valve 351.

[0060] Specifically, this application includes a second check valve 351 and a second gate valve 352 in the second branch pipe 35. The second check valve 351 effectively prevents natural gas, or a mixture of biogas and natural gas, from flowing back into the target pipe section 34, thus avoiding biogas backflow caused by pressure fluctuations. The second gate valve 352 is located between the second check valve 351 and the second outlet 32, and can be manually closed to cut off the biogas flow path on the second branch pipe 35 when needed. Furthermore, the opening degree of the second gate valve 352 can be adjusted to regulate the biogas flow rate within the second branch pipe 35, ensuring a smooth entry of biogas into the first branch pipe 23.

[0061] like Figure 1 As shown, in some embodiments, the target pipe segment 34 is connected to a third branch pipe 36, and the connection position between the third branch pipe 36 and the target pipe segment 34 is located between the first gate valve 342 and the first check valve 341. A third shut-off valve 361 is provided on the third branch pipe 36. The second branch pipe 35 is connected to a fourth branch pipe 37, and the connection position between the fourth branch pipe 37 and the second branch pipe 35 is located between the second gate valve 352 and the second check valve 351. A fourth shut-off valve 371 is provided on the fourth branch pipe 37.

[0062] Specifically, this application connects a third branch pipe 36 to the target pipe section 34 and a fourth branch pipe 37 to the second branch pipe 35. The third branch pipe 36 and the fourth branch pipe 37 provide multiple functional interfaces for the target pipe section 34 and the second branch pipe 35, respectively, to enhance the flexibility of the system. The third branch pipe 36 and the fourth branch pipe 37 can be used to discharge condensate, impurities, or to purge the pipeline. They can also support gas sampling to facilitate the detection of the gas composition and quality of biogas in the target pipe section 34 or the second branch pipe 35. Furthermore, as needed, the third branch pipe 36 and the fourth branch pipe 37 can also achieve rapid discharge of biogas to reduce pressure and improve the emergency response capability and reliability of the system.

[0063] This application provides a third shut-off valve 361 on the third branch pipe 36 and a fourth shut-off valve 371 on the fourth branch pipe 37. The shut-off valves provide an isolation barrier and enable precise flow control, thereby improving the maintainability of the target pipe section 34 or the second branch pipe 35 under different operational requirements. The flow status of biogas in the corresponding pipe can be controlled by manually or automatically controlling the corresponding third shut-off valve 361 or fourth shut-off valve 371.

[0064] like Figure 1 As shown, in some embodiments, a third check valve 25 is also provided on the first pipe 2, and the connection position of the third outlet 33 and the first pipe 2 is located between the regulating valve group 24 and the third check valve 25.

[0065] Specifically, this application also provides a third check valve 25 on the first pipeline 2. By utilizing the characteristic of the third check valve 25 that it only allows flow in one direction and prevents reverse flow, the biogas output from the third gas outlet 33 is mixed with natural gas to prevent backflow or reverse flow, so that the mixture of biogas and natural gas is stably output to the fuel gas inlet 11 of the fuel gas system 1, thus ensuring the safe and stable operation of the system.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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: A fuel gas system, wherein the fuel gas system is provided with a fuel 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 fuel 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, The first pipeline is provided with a regulating valve assembly, which 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 first branch pipe is installed in the regulating valve assembly.

3. The green methanol production system according to claim 2, characterized in that, The first branch pipe is provided with a first shut-off valve and a second shut-off valve at intervals. 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 regulating valve group than the second shut-off valve.

4. The green methanol production system according to claim 2, characterized in that, The second pipe also has a third gas outlet, which is used for biogas output and is connected to the first pipe. The connection position of the third gas outlet and the first pipe is located between the regulating valve group and the first gas outlet.

5. The green methanol production system according to claim 4, characterized in that, The second pipeline includes a target pipe section and a second branch pipe connected to each other. The target pipe section has a second air inlet and a third air outlet, and the second branch pipe has a second air outlet at one end away from the target pipe section.

6. The green methanol production system according to claim 5, characterized in that, The target pipe section is provided with a first check valve and a first gate valve in sequence near the third outlet end, with the first gate valve being closer to the first pipe than the first check valve. The first check valve is located near the first pipe relative to the connection position between the second branch pipe and the target pipe section.

7. The green methanol production system according to claim 6, characterized in that, The second branch pipe includes a second check valve and a second gate valve connected to each other, with the second gate valve being closer to the first branch pipe than 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 third branch pipe. The connection position of the third branch pipe and the target pipe section is located between the first gate valve and the first check valve. A third shut-off valve is provided on the third branch pipe. The second branch pipe is connected to a fourth branch pipe, and the connection position of the fourth branch pipe and the second branch pipe is located between the second gate valve and the second check valve. A fourth shut-off valve is provided on the fourth branch pipe.

9. The green methanol production system according to claim 4, characterized in that, The first pipeline is also equipped with a third check valve, and the connection position of the third outlet end to the first pipeline is located between the regulating valve group and the third check valve.

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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