Raw material liquid conveying device of methanol hydrogen production system

Abstract

The utility model belongs to methanol hydrogen production technical field relates to a kind of raw material liquid conveying devices of methanol hydrogen production system, it includes feed tank, raw material liquid input pipeline, raw material liquid output pipeline, analysis device and balance pipeline being set on raw material liquid output pipeline.Wherein, the inside of feed tank is equipped with decarburization pipe, and the filler for removing carbon dioxide in raw material liquid is equipped in decarburization pipe;Raw material liquid input pipeline is used to transport raw material liquid before decarburization to decarburization pipe;Raw material liquid output pipeline is used to transport raw material liquid after decarburization from feed tank to methanol hydrogen production system;Analysis device is used to detect methanol concentration in raw material liquid after decarburization;Balance pipeline is connected with raw material liquid output pipeline in one end and its connection position is located downstream of analysis device.Analysis device and balance pipeline are equipped on raw material liquid output pipeline, can improve the measurement accuracy of methanol concentration of raw material liquid in methanol hydrogen production system, to improve the stability of methanol hydrogen production system.

Description

Technical Field

[0001] This utility model relates to the field of methanol-to-hydrogen technology, and in particular to a feedstock liquid conveying device for a methanol-to-hydrogen system. Background Technology

[0002] Because liquids of different concentrations have different densities, there is a certain correlation between liquid density and concentration. Therefore, in the chemical industry, the concentration of a liquid is often indirectly obtained by measuring its density. In existing methanol-water solution hydrogen production systems, the feed liquid is stored in a feed tank and flows into the hydrogen production system via a feed liquid delivery pipeline. A hydrometer is usually installed on the feed liquid delivery pipeline to measure the density of the feed liquid, thereby indirectly obtaining the concentration of methanol in the feed liquid.

[0003] However, in actual production, the density value read by the densitometer installed on the raw material liquid delivery pipeline cannot accurately reflect the density of the methanol-water solution. This is because the raw material liquid stored in the tank contains dissolved carbon dioxide gas due to high pressure. After the raw material liquid flows out of the tank, the liquid pressure drops, causing the dissolved carbon dioxide to be released from the liquid and form gaseous carbon dioxide. This affects the accuracy of the densitometer in measuring the density of the methanol-water solution, resulting in a lower measurement result. In addition, a raw material pump is usually installed downstream of the densitometer on the raw material liquid delivery pipeline. When the raw material pump is working, it easily causes fluid pressure fluctuations in the raw material liquid delivery pipeline. These fluid pressure fluctuations have a significant impact on the densitometer, resulting in large fluctuations in the densitometer measurement results.

[0004] Besides indirect measurement using a densitometer, the methanol concentration in the feed liquid can also be measured using other types of concentration meters, such as refractometers, conductivity meters, and ultrasonic concentration meters. The carbon dioxide released from the feed liquid also affects the accuracy of methanol concentration measurements using other types of concentration meters.

[0005] In summary, in the existing technology, the concentration meter on the feed liquid delivery pipeline cannot accurately obtain the concentration of methanol aqueous solution, which affects the precise control of the entire hydrogen production system and makes the stability of the hydrogen production system worse. Utility Model Content

[0006] To address the aforementioned technical problems, this utility model provides a feedstock liquid conveying device for a methanol-to-hydrogen system, which can improve the measurement accuracy of the feedstock liquid concentration in the methanol-to-hydrogen system, thereby enhancing the stability of the methanol-to-hydrogen system.

[0007] The disclosed feedstock delivery device for a methanol-to-hydrogen system includes a feed tank, a feedstock input pipeline, a feedstock output pipeline, an analysis device installed on the feedstock output pipeline, and a balancing pipeline. The feed tank contains a decarbonization pipe with packing material for removing carbon dioxide from the feedstock. The feedstock input pipeline delivers the feedstock before decarbonization to the decarbonization pipe. The feedstock output pipeline delivers the decarbonized feedstock from the feed tank to the methanol-to-hydrogen system. The analysis device detects the methanol concentration in the decarbonized feedstock. One end of the balancing pipeline is connected to the feedstock output pipeline, and its connection point is downstream of the analysis device.

[0008] In some embodiments, the upper end of the decarbonization tube is connected to the feed tank, and the carbon dioxide removed from the raw material liquid leaves the decarbonization tube at least from the upper end; the decarbonized raw material liquid flows out from the bottom of the feed tank.

[0009] In some embodiments, the feed liquid enters the decarbonization tube from the top, and the decarbonization tube guides the feed liquid downward to remove carbon dioxide. Optionally, in other embodiments, the feed liquid enters the decarbonization tube from the bottom, and the decarbonization tube guides the feed liquid upward to remove carbon dioxide.

[0010] Specifically, in some embodiments, the portion of the decarbonization tube used to guide the feed liquid downward is configured as a longitudinal section, the sidewall of which has a plurality of holes, and packing material is disposed within the longitudinal section. In some embodiments, the decarbonization tube further includes a transverse section connected to the longitudinal section, the transverse section being connected to the feed liquid output pipeline.

[0011] In some embodiments, an expansion pipe is provided on the balance pipeline near the raw material output pipeline, and the diameter of the expansion pipe is larger than that of the balance pipeline.

[0012] In some embodiments, the other end of the balancing pipeline is configured as a vent, and the other end of the balancing pipeline is positioned at a height higher than the feed tank. Preferably, the upper part of the feed tank is further provided with a connecting port, and the other end of the balancing pipeline is connected to the connecting port.

[0013] In some embodiments, the upper part of the feed tank is provided with an exhaust port.

[0014] In some embodiments, a metering pump is also provided on the raw material output pipeline, and the metering pump is located downstream of the connection between the balance pipeline and the raw material output pipeline.

[0015] The features and advantages of this disclosure include: The analytical device is located on the feed liquid output pipeline, and it detects the methanol concentration in the decarbonized feed liquid, which improves the accuracy of methanol concentration measurement. Furthermore, a balancing pipeline is located on the feed liquid output pipeline, and its connection point is downstream of the analytical device. This balancing pipeline mitigates or eliminates the impact of pressure fluctuations caused by other downstream devices on the analytical device, resulting in smaller or stable pressure fluctuations in the feed liquid flowing through it, further improving the accuracy of the analytical device's measurement. Therefore, the detection result of the analytical device is close to or represents the actual methanol concentration value. This feed liquid conveying device improves the accuracy of methanol concentration measurement in the methanol-to-hydrogen system, thereby enhancing the stability of the methanol-to-hydrogen system. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying 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.

[0017] Figure 1 A schematic diagram of the feedstock liquid delivery device for the methanol-to-hydrogen system of this disclosure is shown.

[0018] Explanation of reference numerals in the attached figures:

[0019] 100 - Conveying device; 101 - Raw material liquid;

[0020] 110 - Raw material liquid inlet pipeline, 120 - Feed tank, 130 - Raw material liquid outlet pipeline;

[0021] 11-Raw material inlet, 12-Decarbonization pipe, 121-Hole, 122-Decarbonization pipe inlet, 123-Decarbonization pipe outlet, 124-Packing, 13-Raw material outlet, 14-Analytical device, 15-Balance line, 16-Expanding pipe, 17-Metering pump, 18-Connecting port, 19-Exhaust port. Detailed Implementation

[0022] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. Based on the embodiments of this disclosure, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this disclosure.

[0023] In describing this invention, when one or more components are described as being connected, linked, fixed, coupled, attached, or otherwise interconnected, such interconnection may be a direct interconnection between components or an indirect interconnection, such as by using one or more intermediate components.

[0024] refer to Figure 1 This disclosure provides a feedstock liquid conveying device 100 for a methanol-to-hydrogen system, including a feedstock liquid conveying pipeline, a balancing pipeline 15, and a feed tank 120 and an analysis device 14 disposed on the feedstock liquid conveying pipeline. Specifically, the feedstock liquid conveying pipeline includes a feedstock liquid input pipeline 110 and a feedstock liquid output pipeline 130. The pipeline located upstream of the feed tank 120 is the feedstock liquid input pipeline 110, and the pipeline located downstream of the feed tank 120 is the feedstock liquid output pipeline 130. The analysis device 14 and the balancing pipeline 15 are disposed on the feedstock liquid output pipeline 130 downstream of the feed tank 120.

[0025] Specifically, the feed tank 120 is equipped with a decarbonization pipe 12, which contains packing material 124 for removing carbon dioxide from the feed liquid 101. The packing material can be one or more composites of porous materials such as wire mesh, Pall rings, stepped rings, molecular sieves, diatomaceous earth, and metal foam. The feed liquid 101 flowing from the feed tank contains dissolved carbon dioxide. The feed liquid inlet line 110 is used to transport the feed liquid 101 before decarbonization to the decarbonization pipe 12, which guides the flow of the feed liquid. As the feed liquid 101 flows through the packing material 124, carbon dioxide is released from the feed liquid and can enter the feed tank 120 from the decarbonization pipe 12. In some embodiments, the feed liquid 101 after decarbonization can flow into the feed tank 120, and the feed liquid outlet line 130 is used to transport the decarbonized feed liquid 101 from the feed tank 120 to the methanol-to-hydrogen system. In other embodiments, the feed liquid output line 130 is connected to the decarbonization pipe 12, and the feed liquid 101 after decarbonization treatment in the decarbonization pipe 12 can be directly transported to the methanol-to-hydrogen system through the feed liquid output line 130.

[0026] The analyzer 14 is installed on the feed liquid output line 130 and is used to detect the methanol concentration in the decarbonized feed liquid 101. One end of the balance line 15 is connected to the feed liquid output line 130 and is located downstream of the analyzer 14 along the flow direction of the feed liquid 101 in the feed liquid output line 130.

[0027] If the raw material output pipeline 130 is not equipped with a balancing pipeline 15, when other devices downstream of the analyzer 14 cause pressure fluctuations in the raw material output pipeline 130, the raw material flowing through the analyzer 14 will also experience pressure fluctuations, thus affecting the accuracy of the analyzer 14's measurements. Furthermore, when the instantaneous flow rate of the raw material output pipeline 130 increases due to pressure fluctuations, the pressure of the raw material in the raw material output pipeline 130 will decrease. The small amount of residual carbon dioxide in the raw material 101 will further precipitate due to the pressure decrease, and the carbon dioxide gas will further affect the accuracy of the analyzer 14's measurements. The raw material conveying device 100 of this invention provides a balancing pipeline 15 downstream of the analyzer 14. Due to fluid connectivity, the decarbonized raw material 101 can flow from the raw material output pipeline 130 into the balancing pipeline 15. When other devices downstream of the connection point of the balancing pipeline 15 on the raw material output pipeline 130 experience pressure fluctuations, the balancing pipeline 15 can alleviate or eliminate the pressure fluctuations of the raw material flowing through the analyzer 14. Specifically, when fluid pressure fluctuations downstream of the connection point of the balance pipeline 15 cause a momentary decrease in flow rate, the level of the raw material liquid in the balance pipeline 15 will rise; when fluid pressure fluctuations downstream of the connection point of the balance pipeline 15 cause a momentary increase in flow rate, the level of the raw material liquid in the balance pipeline 15 will fall. Therefore, the balance pipeline 15 can alleviate or eliminate pressure fluctuations of the raw material liquid flowing through the analyzer 14, thereby weakening or eliminating the impact of fluid pressure fluctuations downstream of the raw material liquid output pipeline 130 on the measurement accuracy of the analyzer 14, making the methanol concentration value detected by the analyzer 14 more accurate. Preferably, the other end of the balance pipeline 15 is positioned higher than the height of the feed tank 120 to prevent the raw material liquid from overflowing from the balance pipeline 15.

[0028] The feed liquid conveying device 100 of the methanol-to-hydrogen system provided in this disclosure detects the methanol concentration in the feed liquid 101 after decarbonization treatment by the analysis device 14. Furthermore, the influence of downstream fluid pressure fluctuations on the analysis device 14 can be eliminated by setting up the balance pipeline 15. Therefore, the detection result of the analysis device 14 is closer to or represents the actual methanol concentration value, which can improve the measurement accuracy of methanol concentration in the feed liquid of the methanol-to-hydrogen system and thus improve the stability of the methanol-to-hydrogen system.

[0029] Specifically, in some embodiments, the analytical device 14 may be configured as a concentration meter, from which the methanol concentration in the decarbonized feed liquid 101 can be obtained directly; in other embodiments, the analytical device 14 may be configured as a density meter, which indirectly obtains the methanol concentration in the decarbonized feed liquid 101 by obtaining the density of the decarbonized feed liquid 101.

[0030] In some embodiments, the decarbonization tube 12 does not completely remove dissolved carbon dioxide from the feed liquid, and a small amount of carbon dioxide may continue to be released as the feed liquid flows in the feed liquid output line 130.

[0031] In some embodiments, the other end of the balancing line 15 is configured as a vent (not shown). When the feed liquid flows through the feed liquid output line 130 between the feed tank 120 and the balancing line 15, newly released carbon dioxide can flow into the balancing line 15 and be discharged through the vent, reducing the impact of carbon dioxide on the subsequent system. Additionally, when the fluid pressure downstream of the connection point of the balancing line 15 fluctuates, new carbon dioxide may be released from the balancing line 15, and the released carbon dioxide can also be discharged from the vent. Alternatively, in other embodiments, the feed tank 120 has a connecting port 18 at its upper part, and the other end of the balancing line 15 is connected to the connecting port 18, thus connecting the balancing line to the feed tank 120. Subsequently, newly released carbon dioxide is introduced into the feed tank 120 via the balancing line 15, and after converging with the carbon dioxide released from the decarbonization pipe 12, it is discharged from the feed tank 120.

[0032] See also Figure 1 In some embodiments, an expansion pipe 16 is provided on the balance line 15 near the raw material output line 130, and the diameter of the expansion pipe 16 is larger than that of the balance line 15. When the fluid pressure downstream of the raw material output line 130 fluctuates, the expansion pipe 16 can increase the damping, so that the hydraulic pressure is stable when the raw material flows through the analyzer 14, which is beneficial to the accurate detection of the concentration of the raw material.

[0033] In some embodiments, the upper end of the decarbonization pipe 12 is connected to the feed tank 120, and the carbon dioxide removed from the raw material liquid exits the decarbonization pipe 12 from at least the upper end of the decarbonization pipe 12, while the decarbonized raw material liquid 101 flows out from the bottom of the feed tank 120. In some embodiments, see further... Figure 1 The feed liquid enters the decarbonization tube 12 from the upper part, and the decarbonization tube 12 is used to guide the feed liquid to flow downward to remove carbon dioxide. Alternatively, in some other embodiments, the feed liquid enters the decarbonization tube 12 from the lower part, and the decarbonization tube 12 is used to guide the feed liquid to flow upward to remove carbon dioxide.

[0034] When the decarbonization tube 12 is configured to guide the feed liquid downwards to remove carbon dioxide, specifically, in some embodiments, see further details. Figure 1The decarbonization tube 12, used to guide the downward flow of the raw material liquid, is constructed as a longitudinal section. Several holes 121 are provided on the sidewall of the longitudinal section, and packing 124 is disposed within the longitudinal section. During use, the feed tank 120 stores liquid (e.g., raw material liquid). Carbon dioxide released from the decarbonization tube 12 can also be discharged into the feed tank 120 through the holes 121, and liquid outside the decarbonization tube 12 can also flow into it through the holes 121. The released carbon dioxide collects at the top of the feed tank 120 after entering it. In some embodiments, the decarbonized raw material liquid 101 can enter the feed tank 120 through an opening at the bottom of the decarbonization tube and then flow out from the bottom of the feed tank 120. In other embodiments, the decarbonization tube 12 also includes a transverse section connected to the longitudinal section, which is connected to the raw material liquid output line 130. After decarbonization, the raw material liquid flows directly from the decarbonization tube 12 into the raw material liquid output line 130.

[0035] See also Figure 1 The feed tank 120 has a raw material liquid inlet 11 and a raw material liquid outlet 13. The raw material liquid 101 enters the feed tank 120 through the raw material liquid inlet 11, undergoes decarbonization treatment, and then flows out of the feed tank 120 through the raw material liquid outlet 13. The decarbonization pipe 12 has a decarbonization pipe inlet 122 and a decarbonization pipe outlet 123. Preferably, the decarbonization pipe inlet 122 is located close to the raw material liquid inlet 11, and the decarbonization pipe outlet 123 is located close to the raw material liquid outlet 13. The top end of the longitudinal section of the decarbonization pipe 12 is the decarbonization pipe inlet 122, the bottom end of the longitudinal section of the decarbonization pipe 12 is connected to one end of the transverse section of the decarbonization pipe 12, and the other end of the transverse section of the decarbonization pipe 12 is the decarbonization pipe outlet 123, which is connected to the raw material liquid outlet. Alternatively, in some other embodiments, the decarbonization tube inlet 122 is located at a certain distance from the raw material liquid inlet 11; the decarbonization tube outlet 123 is also located at a certain distance from the raw material liquid outlet 13.

[0036] In some embodiments, see continue to see Figure 1 The feed liquid inlet 11 and the decarbonization pipe inlet 122 are located at the upper part of the feed tank 120, and the feed liquid outlet 13 is located at the lower part of the feed tank 120. The feed liquid input pipeline 110 extends from the feed liquid inlet 11 into the decarbonization pipe inlet 122, which can prevent the feed liquid 101 before decarbonization from flowing directly into the feed tank 120 without passing through the packing in the decarbonization pipe 12 for decarbonization. The decarbonization pipe outlet 123 is connected to the feed liquid outlet 13, and the feed liquid output pipeline 130 is connected to the feed liquid outlet 13, so that the decarbonized feed liquid 101 can be directly output from the feed tank 120 through the decarbonization pipe outlet 123. In some other embodiments, the decarbonization pipe outlet may not be connected to the feed liquid outlet 13. For example, the decarbonization pipe outlet may be suspended in the feed tank 120, and the decarbonized feed liquid 101 flows into the feed tank 120 from the decarbonization pipe outlet, and then flows into the feed liquid output pipeline 130 through the feed liquid outlet 13.

[0037] Alternatively, in some embodiments, the decarbonization tube 12 may be configured to include only a longitudinal section. The raw material liquid 101 before decarbonization enters the decarbonization tube 12 from the top of the decarbonization tube 12. As it flows through the packing 124, carbon dioxide is released from the raw material liquid and enters the upper part of the feed tank 120 from the top of the decarbonization tube 12. The raw material liquid 101 after decarbonization enters the lower part of the feed tank 120 from the bottom of the decarbonization tube 12.

[0038] When the decarbonization tube 12 is configured to guide the feed liquid upward to remove carbon dioxide, specifically, in some other embodiments, the feed liquid inlet is located at the lower part of the feed tank 120, the decarbonization tube inlet is connected to the feed liquid inlet, the decarbonization tube outlet is suspended and its position is higher than the decarbonization tube inlet, and the feed liquid outlet is also located at the lower part of the feed tank. The feed liquid 101 before decarbonization in the feed liquid input line 110 flows into the decarbonization tube from the feed liquid inlet and the decarbonization tube inlet. After being decarbonized by the packing, it can flow into the feed tank 120 from the decarbonization tube outlet and then flow into the feed liquid output line 130 from the feed liquid outlet 13 located at the lower part of the feed tank.

[0039] In some embodiments, the upper part of the feed tank 120 is further provided with an exhaust port 19. Carbon dioxide released from the decarbonization pipe 12 collects at the upper part of the feed tank 120 and is discharged from the feed tank 120 through the exhaust port 19. When the balance line 15 is in fluid communication with the feed tank 120, the carbon dioxide released from the decarbonization pipe 12 and the subsequently newly released carbon dioxide are discharged from the feed tank 120 together through the exhaust port 19.

[0040] A metering pump 17 is also provided on the raw material output pipeline 130. Along the flow direction of the raw material liquid 101 in the raw material output pipeline 130, the metering pump 17 is located downstream of the connection point between the balance pipeline 15 and the raw material output pipeline 130. The flow rate of the raw material liquid 101 is controlled by the metering pump 17, thereby reducing pressure disturbances. Preferably, the metering pump 17 is a diaphragm pump.

[0041] The above descriptions are merely a few embodiments of this disclosure. Those skilled in the art can make various modifications or variations to the embodiments of this disclosure based on the content disclosed in the application documents without departing from the spirit and scope of this disclosure.

Claims

1. A feedstock liquid conveying device for a methanol-to-hydrogen system, characterized in that, include: Feed tank (120), the inside of which is provided with decarbonization tube (12), the inside of which is provided with packing material (124) for removing carbon dioxide from raw material liquid (101); The raw material liquid input pipeline (110) is used to transport the raw material liquid (101) before decarbonization to the decarbonization pipe (12); The feed liquid output pipeline (130) is used to transport the decarbonized feed liquid (101) from the feed tank (120) to the methanol-to-hydrogen system; An analytical device (14) is installed on the feed liquid output pipeline (130), the analytical device (14) being used to detect the methanol concentration in the decarbonized feed liquid (101); and A balancing line (15) is provided, one end of which is connected to the raw material output line (130) and its connection position is located downstream of the analytical device (14).

2. The raw material liquid conveying device according to claim 1, characterized in that, The upper end of the decarbonization tube (12) is connected to the feed tank (120), and the carbon dioxide removed from the raw material liquid leaves the decarbonization tube (12) at least from the upper end of the decarbonization tube (12); The decarbonized raw material liquid (101) flows out from the bottom of the feed tank (120).

3. The raw material liquid conveying device according to claim 2, characterized in that, The raw material liquid enters the decarbonization tube (12) from the top, and the decarbonization tube (12) is used to guide the raw material liquid to flow downward to remove carbon dioxide.

4. The raw material liquid conveying device according to claim 3, characterized in that, The decarbonization tube (12) is configured as a longitudinal section for guiding the raw material liquid to flow downwards. The sidewall of the longitudinal section is provided with a plurality of holes (121), and the packing (124) is disposed in the longitudinal section.

5. The raw material liquid conveying device according to claim 4, characterized in that, The decarbonization pipe (12) also includes a transverse section connected to the longitudinal section, and the transverse section is connected to the raw material liquid output pipeline (130).

6. The raw material liquid conveying device according to any one of claims 1 to 5, characterized in that, An expansion pipe (16) is also provided on the balance pipeline (15) near the raw material liquid output pipeline (130), and the diameter of the expansion pipe (16) is larger than the diameter of the balance pipeline (15).

7. The raw material liquid conveying device according to claim 6, characterized in that, The other end of the balance line (15) is configured as a vent, and the other end of the balance line (15) is positioned at a height higher than that of the feed tank (120).

8. The raw material liquid conveying device according to claim 7, characterized in that, The upper part of the feed tank (120) is provided with a connecting port (18), and the other end of the balance pipeline (15) is connected to the connecting port (18).

9. The raw material liquid conveying device according to claim 6, characterized in that, The upper part of the feed tank (120) is also provided with an exhaust port (19).

10. The raw material liquid conveying device according to claim 6, characterized in that, A metering pump (17) is also provided on the raw material output pipeline (130), and the metering pump (17) is located downstream of the connection position between the balance pipeline (15) and the raw material output pipeline (130).

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