Hydrogen pressurization device and method based on multi-stage compression technology

Abstract

The application relates to the technical field of multistage compression, in particular to a hydrogen pressurizing equipment based on a multistage compression technology, which comprises a plurality of series-connected pressurizing parts and a central control module for regulation and control. The application guarantees pressure stability in the pressurizing process by arranging pressure stabilizing pipes between the vortex pipes, so that the plurality of vortex pipes can be connected in series, and the central control module is arranged to accurately monitor the pressure of the pressure stabilizing chambers in the pressure stabilizing pipes and the compression chambers in the vortex pipes, accurately control the pressure state of each pressurizing part, accurately match the multistage pressurizing, and adjust the temperature of the internal compressed gas by cooperating with the cooling pipe layer, so that pressure fluctuation caused by gas temperature change is effectively avoided; the vortex compression structure effectively reduces the vibration and noise of the whole equipment, and the series connection of the pressurizing parts can be selected in number, so that the flexibility of the multistage compression is further improved.

Description

Technical Field

[0001] This invention relates to the field of multi-stage compression technology, and in particular to a hydrogen pressurization device and method based on multi-stage compression technology. Background Technology

[0002] High-pressure hydrogen storage is currently the most mature and widely used hydrogen storage method. It mainly uses multi-layer composite containers to compress and store hydrogen, and can be applied to on-board hydrogen storage, hydrogen refueling stations, and long-tube trailer transportation. Most current hydrogen refueling stations use diaphragm reciprocating compressors for hydrogen pressurization to meet the needs of efficient compression and refueling in hydrogen storage and transportation. Although diaphragm reciprocating compressors have a high single-stage compression ratio, their overall lifespan is short, and they generate significant vibration and noise, requiring a large footprint, which severely restricts the flexible layout of hydrogen refueling stations and the application scenarios for hydrogen pressurization.

[0003] Chinese Patent Publication No. CN117823386B discloses a hydrogen pressurization method based on multi-stage compression technology. This method achieves multi-stage hydrogen pressurization by integrating four compression sections. Although the structure has a high degree of integration and improved sealing, it is still essentially a high-energy-consuming reciprocating compression process, and it still exhibits significant vibration and noise. Based on this, Chinese Patent Publication No. CN117846962B discloses a compact compressor for multi-stage compression. Its key technical point is the use of a single drive source to start a horizontally opposed scroll compressor structure, achieving two-stage compression in the scroll compressor structure. While this improves noise reduction, efficiency, and structural compactness, its structural design limits the compressor's maximum compression limit to two stages, preventing the achievement of more efficient compression stages. Summary of the Invention

[0004] Therefore, the present invention provides a hydrogen booster device and method based on multi-stage compression technology to overcome the problems of high noise and vibration and limited application scenarios and low flexibility of existing multi-stage hydrogen booster devices due to the single compression mode adopted.

[0005] To achieve the above objectives, the present invention provides a hydrogen booster device based on multi-stage compression technology, comprising a plurality of booster units and a central control module connected in series. The booster unit includes a vortex pipe and a pressure stabilizing pipe. The output direction of the pressure stabilizing pipe is connected to the input direction of the vortex pipe, and the output direction of the vortex pipe is connected to the input direction of the pressure stabilizing pipe of the next booster unit in series.

[0006] The vortex body and the support partition inside the vortex pipe jointly isolate the compression chamber. The vortex body is used to compress the gas in the compression chamber and discharge it.

[0007] The pressure-controlling plunger, cooling pipe layer, and removable pipe plug in the pressure-stabilizing pipeline jointly isolate the pressure-stabilizing chamber. The pressure-controlling plunger can move within the pressure-stabilizing chamber to adjust the real-time pressure-stabilizing gas pressure within the pressure-stabilizing chamber.

[0008] The central control module can determine the real-time compressed air pressure in the compression chamber of any booster unit and the real-time stable air pressure in the stabilizing chamber according to the preset standard pressure range. When the central control module determines that neither the real-time compressed air pressure nor the real-time stable air pressure is within the standard pressure range, it adjusts the speed of the drive shaft of the moving scroll plate in the scroll body or controls the movement of the pressure control plunger.

[0009] Furthermore, the central control module is equipped with a standard pressure range consisting of the standard pressure value and the standard pressure difference corresponding to each level of the booster section. When the real-time compressed air pressure in the compression chamber of any level of booster section is not within the standard pressure range, the central control module obtains the real-time stabilizing air pressure in the stabilizing chamber of that level of booster section for further judgment. If the real-time stabilizing air pressure is within the standard pressure range, the central control module adjusts the standard pressure difference according to the real-time compressed air pressure and the standard pressure value.

[0010] Wherein, ΔPj=ΔPb×[1+(|Pb-Ps| / Pb)], where Ps is the real-time compressed air pressure, Pb is the standard pressure value, ΔPb is the standard pressure difference, and ΔPj is the adjusted standard pressure difference.

[0011] Furthermore, when the central control module determines that the pressure stabilizing chamber is in an overpressure state, it will adjust the initial rotational speed Vc of the drive shaft of the moving scroll disk to Vc' based on the real-time stabilizing air pressure and the standard pressure value, where Vc' = Vc × (Pb / Py).

[0012] Among them, the overpressure state is when both the real-time compressed air pressure and the real-time stabilized air pressure are outside the standard pressure range and the real-time stabilized air pressure is greater than the standard pressure value, Vc is the initial speed of the moving scroll drive shaft, Vc' is the adjusted speed of the moving scroll drive shaft, and Py is the real-time stabilized air pressure.

[0013] Furthermore, when the central control module determines that the pressure stabilizing chamber is in a low-pressure state, it will determine the location of the booster unit. If the booster unit is the front-end booster unit, the central control module will issue an insufficient intake pressure alarm.

[0014] Among them, the low-pressure state is when both the real-time compressed air pressure and the real-time stable air pressure are outside the standard pressure range and the real-time stable air pressure is less than the standard pressure value; the front-end booster section is the most advanced air booster section connected to the air inlet section in the series of hydrogen booster equipment.

[0015] Furthermore, when the central control module determines that the pressure stabilizing chamber is in a low-pressure state and the pressure boosting section is not the front-end pressure boosting section, it will control the pressure control plunger to move and squeeze the space inside the pressure stabilizing chamber, adjust the real-time pressure stabilizing air pressure inside the pressure stabilizing chamber, and stop the movement and squeezing of the pressure control plunger when the real-time pressure stabilizing air pressure reaches the standard pressure range.

[0016] Furthermore, the central control module is also equipped with a first preset temperature and a second preset temperature, wherein the first preset temperature is lower than the second preset temperature, and the central control module can obtain the real-time stabilizing temperature in the stabilizing chamber of any level of booster unit.

[0017] When the real-time stabilized temperature is greater than or equal to the second preset temperature, the central control module adjusts the flow rate of the cooling medium in the cooling pipe layer according to the real-time stabilized temperature and the second preset temperature.

[0018] Where Lc' = Lc × [1 + (Ts - T2) / T2], Lc is the initial cooling circulation velocity of the cooling pipe layer, Lc' is the adjusted cooling circulation velocity of the cooling pipe layer, Ts is the real-time stabilized temperature, and T2 is the second preset temperature.

[0019] Furthermore, when the air pressure in the pressure stabilizing chamber is in an overpressure state and the temperature in the pressure stabilizing chamber is in a critical state, the central control module adjusts the initial cooling circulation flow rate Lc in the cooling pipe layer to Lc”, Lc”=Lc×[1+(Ts-T1) / T1], where Lc” is the cooling circulation flow rate of the cooling pipe layer after adjustment in the critical state, and T1 is the first preset temperature;

[0020] The critical state is defined as a real-time stabilized temperature that is greater than the first preset temperature and less than the second preset temperature.

[0021] Furthermore, the hydrogen booster also includes a compressor head and several monitoring units;

[0022] The head is located at one end of the frame. The head contains a drive source, which outputs power through the output shaft. The two ends of the output shaft are connected to the head and the shaft support located at the other end of the frame, respectively. The output shaft is also connected to several series-connected booster units to provide power output to each booster unit.

[0023] The number of monitoring units corresponds to the number of pressurization units; each monitoring unit includes a first pressure sensor installed in the compression chamber to detect the real-time compressed air pressure, a second pressure sensor installed in the pressure stabilizing chamber to detect the real-time stabilized air pressure, and a temperature sensor installed in the pressure stabilizing chamber to detect the real-time stabilized temperature.

[0024] Furthermore, the cooling pipe layer is nested inside the pressure stabilizing pipe. One end of the pressure stabilizing pipe is equipped with a fixed pipe plug plate, and the other end is a removable pipe plug plate. A pressure stabilizing inlet is opened at the axial position of the fixed pipe plug plate. An extension nozzle extending into the inside of the pressure stabilizing pipe is provided on the pressure stabilizing inlet. The pressure control plunger is sleeved on the extension nozzle through a through hole on its own axis.

[0025] A control device is provided on one side of the fixed pipe plug plate. The control device is equipped with a telescopic hydraulic cylinder, which passes through the fixed pipe plug plate and is connected to the pressure control plunger.

[0026] Multiple turns of cooling circulation pipe are wound around the cooling pipe layer. The cooling circulation pipe is connected to the circulation machine located outside the pressure stabilizing pipe. The circulation machine is connected to the output shaft through the pressure stabilizing differential box. The differential speed of the pressure stabilizing differential box is adjustable.

[0027] This invention also provides a hydrogen pressurization method based on multi-stage compression technology, comprising,

[0028] Step S1: Set up several booster sections consisting of vortex pipes and pressure-stabilizing pipes, connect the output direction of the pressure-stabilizing pipes to the input direction of the vortex pipes, and then connect the output of the vortex pipe of any booster section to the input of the pressure-stabilizing pipe of another booster section, so that the booster sections are connected in series.

[0029] Step S2: Obtain the real-time compressed air pressure in any of the booster chambers through the central control module, and determine whether the air pressure in the chamber is stable according to the set standard pressure range.

[0030] Step S3: When the air pressure in the compression chamber is unstable, the real-time stabilizing air pressure in the stabilizing chamber is determined according to the standard pressure range to determine the pressure state in the stabilizing chamber.

[0031] Step S4: When the pressure stabilizing chamber is in an overpressure state, the speed of the drive shaft of the moving scroll plate is adjusted by the compression differential.

[0032] Step S5: When the pressure stabilizing chamber is in a low-pressure state and the pressure boosting section is not the front-end pressure boosting section, the pressure control plunger is moved to compress the volume of the pressure stabilizing chamber and adjust the real-time pressure stabilizing air pressure of the pressure stabilizing chamber.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows: by setting up several series-connected boosting units to achieve multi-stage boosting in a vortex manner, and by setting up pressure stabilizing pipes between each vortex pipe to ensure pressure stability during the boosting process, multiple vortex pipes can also be connected in series. At the same time, a central control module is set up to accurately monitor the pressure in the pressure stabilizing chamber in the pressure stabilizing pipe and the compression chamber in the vortex pipe, accurately controlling the pressure state of each boosting unit to achieve precise matching between multi-stage boosting. The use of a vortex compression structure effectively reduces the overall vibration and noise of the equipment. In addition, the number of boosting units can be selected to be connected in series, which not only improves the flexibility of equipment use, but also improves the compression efficiency of multi-stage compression equipment.

[0034] Furthermore, by setting a pressure-controlled plunger, pressure control on the intake side of the vortex body can be achieved without changing the compression efficiency. In addition, the temperature of the internal compressed gas can be regulated by setting a cooling pipe layer, which effectively avoids pressure fluctuations caused by gas temperature changes and ensures the stable operation of the hydrogen booster equipment. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the hydrogen booster device based on multi-stage compression technology in this embodiment;

[0036] Figure 2 This is a schematic diagram of the pressurization unit in this embodiment;

[0037] Figure 3 This is a schematic diagram of the vortex body in this embodiment;

[0038] Figure 4 This is a flowchart of the hydrogen pressurization method based on multi-stage compression technology in this embodiment. Detailed Implementation

[0039] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0040] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0041] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0042] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0043] Please see Figures 1 to 3 As shown, this embodiment provides a hydrogen booster device based on multi-stage compression technology, including: a compressor head 1, a frame 101, a drive source 102, an output shaft 103, a shaft support 104, a booster section 2, a vortex pipe 21, a vortex body 211, a support partition 212, a compression chamber 213, a compression outlet 214, a stationary vortex disk 206, a moving vortex disk 207, a discharge port 208, a drive shaft 215, a drive box 216, a steering box 217, a compression differential box 218, a compression inlet 219, a pressure stabilizing pipe 22, and a pressure control column. 221, Plug 222, Cooling pipe layer 222, Fixed pipe plug 223, Removable pipe plug 224, Pressure stabilizing inlet 225, Extended air nozzle 226, Pressure stabilizing chamber 227, Pressure stabilizing outlet 228, Cooling circulation pipe 201, Circulator 202, Pressure stabilizing differential gearbox 203, Control device 204, Telescopic cylinder 205, Monitoring unit 3, First pressure sensor 301, Second pressure sensor 302, Temperature sensor 303, Air intake unit 4, Air intake end cover 401, Auxiliary air intake impeller 402, Central control module (not shown in the figure), among which,

[0044] The head unit 1 is located at one end of the frame 101. The head unit 1 is equipped with a drive source 102. The drive source 102 outputs power through the output shaft 103. The two ends of the output shaft 103 are connected to the head unit 1 and the shaft support 104 located at the other end of the frame 101, respectively. During installation, the output shaft 103 is inserted into the hole of the shaft support 104. The shaft support 104 is fitted with a bearing ring, which can fix the end of the output shaft 103 without hindering the rotation of the output shaft 103, thus ensuring the smooth operation of the output shaft 103.

[0045] The booster unit 2 includes a vortex pipe 21 and a pressure stabilizing pipe 22. The pressure stabilizing pipe 22 is connected to the vortex pipe 21 in the input direction in the output direction to form a booster unit 2. In this embodiment, three sets of booster units 2 are connected in series. The output of one set of booster units 2 is the output of the vortex pipe 21, and the output of the vortex pipe 21 can be connected to the pressure stabilizing pipe 22 of the next set of booster units 2 connected in series. At the same time, the vortex pipe 21 and the pressure stabilizing pipe 22 are both pipe-shaped structures and connected to each other by flanges. This facilitates disassembly and replacement while ensuring the overall sealing performance. The number of booster units 2 can also be adjusted according to actual usage conditions to achieve multi-stage boosting in series.

[0046] The vortex pipe 21 includes a vortex body 211 and a support partition 212. The vortex body 211 and the support partition 212 together isolate a compression chamber 213 in the vortex pipe 21. The vortex body 211 compresses the gas in the compression chamber 213 and discharges it through the compression outlet 214 into the pressure stabilizing pipe 22 of the next set of pressurization section 2, thereby completing one level of compression.

[0047] The vortex body 211 includes a stationary vortex disk 206 and a moving vortex disk 207. Both the stationary vortex disk 206 and the moving vortex disk 207 are disks with internal spiral walls. By mirroring the moving vortex disk 207 and driving it eccentrically, the gas is compressed between the spiral walls of the two vortex disks. This is the same as the current vortex compression technology. Different materials and sizes of vortex bodies 211 can be selected according to actual usage requirements.

[0048] The stationary vortex disk 206 is provided with a discharge hole 208, which is connected to the compression outlet 214. In order to ensure airtightness, the stationary vortex disk 206 and the compression outlet 214 can also be manufactured as a single piece.

[0049] A drive shaft 215 is provided on one side of the moving scroll plate 207. The drive shaft 215 passes through the support partition 212 and is connected to the output main shaft 103 in sequence through the drive box 216, the steering box 217, and the compression differential box 218. The support partition 212 can separate the drive part of the moving scroll plate 207 from the compression chamber 213, ensuring the cleanliness and sealing of the inside of the compression chamber 213. At the same time, the support partition 212 is also provided with a compression inlet 219 to achieve gas supply in the compression chamber 213 on the basis of cleanliness and sealing inside the compression chamber 213.

[0050] The drive housing 216, steering housing 217, and compression differential housing 218 are all gear sets. The drive housing 216 engages with the drive shaft 215 to drive it. The steering housing 217 uses a gear structure to turn the power output direction of the compression differential housing 218 to the drive housing 216. The compression differential housing 218 has a differential control function, which adjusts the differential speed by driving the output shaft 103. The specific gear set configuration of the drive housing 216, steering housing 217, and compression differential housing 218 can be adjusted according to actual usage requirements. These are all conventional configurations and can be set according to the specific working conditions.

[0051] The pressure stabilizing pipe 22 includes a pressure control plunger 221 and a cooling pipe layer 222. The cooling pipe layer 222 is nested inside the pressure stabilizing pipe 22. One end of the pressure stabilizing pipe 22 is provided with a fixed pipe plug 223, and the other end is provided with a removable pipe plug 224. The pressure stabilizing inlet 225 is located at the axial position of the fixed pipe plug 223. An extension nozzle 226 extending into the inside of the pressure stabilizing pipe 22 is provided on the pressure stabilizing inlet 225.

[0052] The pressure-controlled plunger 221 is a cylinder with a through hole in its center. The pressure-controlled plunger 221 is sleeved on the extension nozzle 226 through the through hole, and the outer wall of the pressure-controlled plunger 221 is in contact with the inner wall of the cooling pipe layer 222. One end face of the pressure-controlled plunger 221, the inner wall of the cooling pipe layer 222, and the inner side wall of the removable pipe plug plate 224 together isolate the pressure-stabilizing chamber 227. The removable pipe plug plate 224 is also provided with a pressure-stabilizing outlet 228, which can be connected to the compression inlet 219 of the vortex body 211 of the booster section 2 through a pipe.

[0053] Multiple turns of cooling circulation pipe 201 are wound on the cooling pipe layer 222. The cooling circulation pipe 201 is connected to the circulation machine 202 outside the pressure stabilizing pipe 22. The circulation machine 202 is connected to the output shaft 103 through the pressure stabilizing differential box 203. The cooling medium in the circulation machine 202 is circulated by the power output of the output shaft 103. The pressure stabilizing differential box 203 also has a differential control function.

[0054] A control device 204 is provided on the outside of the fixed pipe plug 223. The control device 204 is connected to the pressure control plunger 221 on the inside of the fixed pipe plug 223 through a telescopic cylinder 205. The control device 204 adjusts the displacement of the pressure control plunger 221 in the cooling pipe layer 222 by controlling the extension and retraction state of the telescopic cylinder 205, and adjusts the internal pressure of the pressure stabilizing chamber 227 by changing the volume of the pressure stabilizing chamber 227. The control device 204 can be driven by electric or hydraulic means. In practical applications, the driving force source of the control device 204 can be configured according to the usage requirements, which will not be elaborated here.

[0055] The number of monitoring units 3 must correspond to the number of pressurization units 2. The monitoring unit 3 includes a first pressure sensor 301 installed inside the compression chamber 213 and a second pressure sensor 302 and a temperature sensor 303 installed inside the pressure stabilizing chamber 227. The first pressure sensor 301 is used to detect the real-time compressed air pressure inside the compression chamber 213, the second pressure sensor 302 is used to detect the real-time stabilizing air pressure inside the pressure stabilizing chamber 227, and the temperature sensor 303 is used to detect the real-time stabilizing temperature inside the pressure stabilizing chamber 227.

[0056] The air intake 4 includes an air intake end cover 401 and an auxiliary air intake impeller 402. The air intake 4 is connected to the booster 2 located at the front end via a flange connection.

[0057] The final pressurization section 2 outputs to the application end through the compressor head 1 via the compression outlet 214 provided on the vortex body 211;

[0058] The central control module is located inside the engine head 1 and is connected to the compression differential 218, the pressure stabilizing differential 203 and the control device 204 of each booster unit 2. The central control module is also connected to the first pressure sensor 301, the second pressure sensor 302 and the temperature sensor 303 of each monitoring unit 3.

[0059] In this embodiment, the central control module presets standard pressure values ​​Pb and standard pressure differences ΔPb for each stage of the booster unit 2. The standard pressure values ​​Pb and standard pressure differences ΔPb constitute the standard pressure range of that stage of the booster unit 2. For any stage of the booster unit 2, the central control module obtains the real-time compressed air pressure Ps from the first pressure sensor 301 of its corresponding monitoring unit 3. The central control module calculates the real-time pressure difference ΔPs based on the real-time compressed air pressure Ps and the standard pressure value Pb, where ΔPs = |Pb - Ps|, and compares the real-time pressure difference ΔPs with the standard pressure difference ΔPb.

[0060] If the real-time pressure difference ΔPs does not exceed the standard pressure difference ΔPb, i.e. ΔPs≤ΔPb, the central control module determines that the air pressure in the compression chamber 213 of the booster unit 2 is stable; the central control module also determines the pressure in other booster units 2. If the air pressure in the compression chamber 213 of each booster unit 2 is stable, the central control module will not adjust the booster unit 2 at each level.

[0061] If the real-time pressure difference ΔPs exceeds the standard pressure difference ΔPb, i.e. ΔPs>ΔPb, the central control module determines that the air pressure in the compression chamber 213 of the booster unit 2 is unstable.

[0062] By setting a standard pressure range to determine the real-time compressed air pressure in the compression chamber 213, the intake pressure of the vortex body 211 can be accurately controlled. Since the compression chamber 213 is closer to the vortex body 211, the pressure here can better characterize the intake pressure of the vortex body 211.

[0063] The central control module will acquire the real-time regulated air pressure Py from the second pressure sensor 302 of the booster unit 2, and calculate the real-time verification difference ΔPy based on the real-time regulated air pressure Py and the standard pressure value Pb, where ΔPy = |Pb - Py|, and compare the real-time verification difference ΔPy with the standard pressure difference ΔPb.

[0064] If the real-time verification difference ΔPy does not exceed the standard pressure difference ΔPb, i.e. ΔPy≤ΔPb, the central control module determines that the air pressure in the pressure stabilizing chamber 227 of the booster unit 2 is stable, and will adjust the standard pressure difference ΔPb according to the real-time compressed air pressure Ps and the standard pressure value Pb.

[0065] Specifically, the adjusted standard pressure difference ΔPj, ΔPj=ΔPb×[1+(|Pb-Ps| / Pb)], will be used as the judgment standard when the real-time compressed air pressure Ps in the compression chamber 213 is subsequently judged by the booster unit 2. However, the initial judgment standard, i.e., the standard pressure difference ΔPb, will always be used for the subsequent judgment of the real-time stabilizing air pressure Py in the stabilizing chamber 227.

[0066] If the real-time verification difference ΔPy exceeds the standard pressure difference ΔPb, i.e. ΔPy>ΔPb, the central control module determines that the air pressure in the pressure stabilizing chamber 227 of the booster unit 2 is unstable. The central control module compares the real-time stabilizing air pressure Py with the standard pressure value Pb to determine the pressure situation in the pressure stabilizing chamber 227.

[0067] When the real-time compressed air pressure in the compression chamber 213 is not within the standard range, the real-time stabilized air pressure in the stabilizing chamber 227 is further judged. Since the space inside the compression chamber 213 is relatively small, and the vortex body 211 is in a continuous air intake state, pressure fluctuations in the compression chamber 213 are inevitable. Therefore, by verifying and judging the real-time stabilized air pressure in the stabilizing chamber 227, unnecessary adjustment processes are avoided due to small pressure fluctuations in the compression chamber 213. At the same time, the standard pressure difference of the judgment reference value of the real-time compressed air pressure in the compression chamber 213 is adaptively adjusted, which can ensure the stable operation of the central control module without affecting the compression process.

[0068] If the real-time regulated air pressure Py is greater than the standard pressure value Pb, the central control module determines that the pressure stabilizing chamber 227 is in an overpressure state. The central control module will adjust the speed of the drive shaft 215 of the moving scroll plate 207 through the compression differential box 218 of the booster unit 2. The central control module has a preset initial speed Vc of the drive shaft 215 of the moving scroll plate 207 of any booster unit 2. When it is determined that any pressure stabilizing chamber 227 is in an overpressure state, the central control module will adjust the speed of the drive shaft 215 of the moving scroll plate 207 to Vc' through the compression differential box 218 of the booster unit 2. Vc' = Vc × (Pb / Py).

[0069] When the pressure stabilizing chamber 227 is in an overpressure state, the compression chamber 213 connected to it is also in an overpressure state. Because the intake pressure is high at this time, it also affects the output of the vortex body 211, which will cause the next stage of the booster section 2 to malfunction. By timely reducing the speed of the moving vortex disk 207 of the booster section 2, the intake compression rate is reduced to ensure the normal compression of the subsequent booster sections 2 and maintain the stable operation of the overall equipment.

[0070] If the real-time stabilized pressure Py is less than the standard pressure value Pb, the central control module determines that the pressure stabilizing chamber 227 is in a low-pressure state. The central control module will determine the position of the booster unit 2. When the booster unit 2 is a front-end booster unit 2 connected to the intake unit 4, the central control module will issue an insufficient intake pressure alarm. On-site personnel will check the intake status of the intake unit 4 or adjust the auxiliary intake impeller 402 to make the real-time stabilized pressure Py in the booster unit 2 reach the standard pressure range. When the booster unit 2 is not a front-end booster unit 2, the central control module will control the pressure control plunger 221 to adjust the real-time stabilized pressure Py of the pressure stabilizing chamber 227 of the booster unit 2 to make the real-time stabilized pressure Py reach the standard pressure range.

[0071] Similarly, when the pressure stabilizing chamber 227 is in a low-pressure state, the compression chamber 213 connected to it is also in a low-pressure state, which will affect the insufficient pressure on the output side of the scroll body 211. Therefore, by controlling the movement of the pressure control plunger 221, the volume in the pressure stabilizing chamber 227 is compressed, thereby providing pressure on the intake side of the scroll body 211 and making it operate stably. When the pressure on the intake side of the scroll body 211 is insufficient, although the stability of the output side of the scroll body 211 can also be ensured by increasing the rotation speed of the moving scroll disk 207, since the various stages of the booster section in this embodiment use the same output shaft 103 as the power source, when the load of one stage booster section 2 increases, it will affect the instability of other stages of booster section 2. Therefore, this method is not used in the low-pressure state. The speed of the rotating scroll 207 is increased to adjust the pressure. Meanwhile, if the booster 2 is a front-end booster connected to the intake 4, its air intake source depends on the working state of the intake 4 and the external air supply. In this embodiment, the auxiliary intake impeller 402 of the intake 4 is manually adjustable. Alternatively, the operation of the auxiliary intake impeller 402 can be controlled by the central control module according to actual usage requirements, adjusting the air intake of the front-end booster 2 by increasing the airflow velocity. A pressure control plunger 221 is also provided in the pressure stabilizing pipe 22 of the front-end booster 2. When a closed area can be created between the intake 4 or the external air supply and the front-end booster 2, the pressure state in the pressure stabilizing chamber 227 can be controlled by adjusting the pressure control plunger 221.

[0072] In this embodiment, the standard pressure value Pb and standard pressure difference ΔPb of each stage of the booster unit 2 set in the central control module are the average values ​​of the pressure collected at various points during operation. Taking the front-end booster unit 2 as an example, when the external intake environment pressure is set to standard atmospheric pressure, the standard pressure value set for the corresponding stage of booster unit 2 is 101.3 kPa, and the corresponding standard pressure difference is 4.2 kPa. The standard pressure difference is taken as the average value of the pressure fluctuation during operation. The initial speed of the drive shaft 215 of the moving scroll plate 207 needs to be selected and set according to the actual chamber volume of the compression chamber 213 or the pressure stabilizing chamber 227 and the required compression efficiency, which will not be elaborated here.

[0073] The central control module is also equipped with a first preset temperature T1 and a second preset temperature T2 corresponding to each stage of the booster unit 2, where T1 < T2. For any stage of the booster unit 2, the central control module will acquire the real-time stabilized temperature Ts of the temperature sensor 303 in the pressure stabilizing chamber 227 of that stage of the booster unit 2, and determine the real-time stabilized temperature Ts based on the first preset temperature T1 and the second preset temperature T2.

[0074] If the real-time stabilized temperature Ts does not exceed the first preset temperature T1, i.e., Ts≤T1, the central control module determines that the temperature inside the booster section 2 is normal and does not adjust the flow rate of the cooling medium in the cooling pipe layer 222 of the booster section 2.

[0075] If the real-time stabilizing temperature Ts is between the first preset temperature T1 and the second preset temperature T2, i.e. T1 < Ts < T2, the central control module will determine that the temperature inside the booster unit 2 is in a critical state.

[0076] If the real-time stabilized temperature Ts has reached the second preset temperature T2, i.e., Ts≥T2, the central control module will determine that the temperature in the booster section 2 is abnormal. The central control module will adjust the flow rate of the cooling medium in the cooling pipe layer 222 of the booster section 2 according to the real-time stabilized temperature Ts and the second preset temperature T2. The initial cooling circulation flow rate Lc of the booster section 2 set in the central control module will be adjusted to Lc', where Lc'=Lc×[1+(Ts-T2) / T2].

[0077] When the central control module determines that the temperature inside any stage of the booster unit 2 is at a critical state, the central control module will determine whether to adjust the flow rate of the cooling medium in the cooling pipe layer 222 based on the state of the pressure stabilizing chamber 227 of that stage of the booster unit 2.

[0078] When the pressure stabilizing chamber 227 is not under overpressure, the central control module does not adjust the flow rate of the cooling medium in the cooling pipe layer 222 of the booster section 2.

[0079] When the pressure stabilizing chamber 227 is in an overpressure state, the initial cooling circulation flow rate Lc of the booster unit 2 set in the central control module is adjusted to Lc”, where Lc”=Lc×[1+(Ts-T1) / T1];

[0080] When adjusting the initial cooling circulation flow rate, the central control module adjusts the circulation flow rate of the cooling medium in the circulator 202 by adjusting the pressure regulating differential 203.

[0081] By setting a secondary temperature threshold, the temperature state inside the pressure stabilizing chamber 227 can be determined more accurately, ensuring the stable and safe operation of the hydrogen booster equipment. The first preset temperature and the second preset temperature also need to be set according to the output gas temperature requirements. In order to ensure compression efficiency, the gas temperature during compression is usually not more than 65°C. In this embodiment, the first preset temperature is set to 32°C and the second preset temperature is set to 45°C.

[0082] Please continue reading. Figure 4 The diagram shows a flowchart of a hydrogen pressurization method based on multi-stage compression technology in this embodiment. This embodiment also provides a hydrogen pressurization method based on multi-stage compression technology, including:

[0083] Step S1: Set up several booster units 2 consisting of vortex pipes 21 and pressure stabilizing pipes 22, connect the output direction of the pressure stabilizing pipes 22 to the input direction of the vortex pipes 21, and then connect the output of the vortex pipes 21 of any booster unit 2 to the input of the pressure stabilizing pipes 22 of another booster unit 2, so that each booster unit 2 is connected in series.

[0084] Step S2: Obtain the real-time compressed air pressure in the compression chamber 213 of any booster unit 2 through the central control module, and determine whether the air pressure in the compression chamber 213 is stable according to the set standard pressure range.

[0085] Step S3: When the air pressure in the compression chamber 213 is unstable, that is, the real-time compressed air pressure is not within the standard pressure range, the real-time stabilized air pressure in the stabilizing chamber 227 is determined according to the standard pressure range to determine the pressure state in the stabilizing chamber 227.

[0086] Step S4: When the pressure stabilizing chamber 227 is in an overpressure state, that is, the real-time stabilizing air pressure is not within the standard pressure range and the real-time stabilizing air pressure is greater than the standard pressure value, the speed of the drive shaft 215 of the moving scroll plate 207 is adjusted through the compression differential 218.

[0087] In step S5, when the pressure stabilizing chamber 227 is in a low-pressure state, that is, when the real-time stabilizing air pressure is not within the standard pressure range and the real-time stabilizing air pressure is less than the standard pressure value, and when the booster 2 is not the front-end booster 2, the pressure control plunger 221 is moved to squeeze the volume in the pressure stabilizing chamber 227 to adjust the real-time stabilizing air pressure of the pressure stabilizing chamber 227.

[0088] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

[0089] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A hydrogen booster device based on multi-stage compression technology, characterized in that, It includes several booster units and a central control module connected in series. The booster unit includes a vortex pipe and a pressure stabilizing pipe. The output direction of the pressure stabilizing pipe is connected to the input direction of the vortex pipe, and the output direction of the vortex pipe is connected to the input direction of the pressure stabilizing pipe of the next booster unit in series. The vortex body and the support partition inside the vortex pipe jointly isolate the compression chamber. The vortex body is used to compress and discharge the gas in the compression chamber. The pressure-controlling plunger, cooling pipe layer, and removable pipe plug in the pressure-stabilizing pipeline jointly isolate the pressure-stabilizing chamber. The pressure-controlling plunger can move within the pressure-stabilizing chamber to adjust the real-time pressure-stabilizing gas pressure within the pressure-stabilizing chamber. The central control module can determine the real-time compressed air pressure in the compression chamber of any of the pressurizing units and the real-time stable air pressure in the pressure stabilizing chamber according to the preset standard pressure range. When the central control module determines that neither the real-time compressed air pressure nor the real-time stable air pressure is within the standard pressure range, it adjusts the speed of the drive shaft of the moving scroll plate in the scroll body or controls the movement of the pressure control plunger.

2. The hydrogen booster device based on multi-stage compression technology according to claim 1, characterized in that, The central control module is equipped with a standard pressure range consisting of the standard pressure value and the standard pressure difference corresponding to each level of the booster section. When the real-time compressed air pressure in the compression chamber of any level of booster section is not within the standard pressure range, the central control module obtains the real-time stabilized air pressure in the stabilizing chamber of that level of booster section and continues to make a judgment. If the real-time stabilized air pressure is within the standard pressure range, the central control module adjusts the standard pressure difference according to the real-time compressed air pressure and the standard pressure value. Wherein, ΔPj=ΔPb×[1+(|Pb-Ps| / Pb)], where Ps is the real-time compressed air pressure, Pb is the standard pressure value, ΔPb is the standard pressure difference, and ΔPj is the adjusted standard pressure difference.

3. The hydrogen booster device based on multi-stage compression technology according to claim 2, characterized in that, When the central control module determines that the pressure stabilizing chamber is in an overpressure state, it will adjust the initial rotational speed Vc of the drive shaft of the moving scroll disk to Vc' based on the real-time stabilizing air pressure and the standard pressure value, where Vc' = Vc × (Pb / Py). Wherein, the overpressure state is when both the real-time compressed air pressure and the real-time stabilized air pressure are outside the standard pressure range and the real-time stabilized air pressure is greater than the standard pressure value, Vc is the initial rotational speed of the moving scroll drive shaft, Vc' is the adjusted rotational speed of the moving scroll drive shaft, and Py is the real-time stabilized air pressure.

4. The hydrogen booster device based on multi-stage compression technology according to claim 3, characterized in that, When the central control module determines that the pressure stabilizing chamber is in a low-pressure state, it will determine the position of the booster section. If the booster section is the front-end booster section, the central control module will issue an insufficient air intake pressure alarm. The low-pressure state refers to a situation where both the real-time compressed air pressure and the real-time stable air pressure are outside the standard pressure range, and the real-time stable air pressure is less than the standard pressure value; the front-end booster unit is the booster unit of this stage that is connected to the air inlet in the series of hydrogen booster equipment.

5. The hydrogen booster device based on multi-stage compression technology according to claim 4, characterized in that, When the central control module determines that the pressure stabilizing chamber is in a low-pressure state and the pressure boosting section is not the front-end pressure boosting section, it will control the pressure control plunger to move and squeeze the space inside the pressure stabilizing chamber, adjust the real-time stabilizing air pressure inside the pressure stabilizing chamber, and stop the movement and squeezing of the pressure control plunger when the real-time stabilizing air pressure reaches the standard pressure range.

6. The hydrogen booster device based on multi-stage compression technology according to claim 5, characterized in that, The central control module is also equipped with a first preset temperature and a second preset temperature, wherein the first preset temperature is lower than the second preset temperature. The central control module can obtain the real-time stabilizing temperature in the stabilizing chamber of any level of booster unit. When the real-time stabilized temperature is greater than or equal to the second preset temperature, the central control module adjusts the flow rate of the cooling medium in the cooling pipe layer according to the real-time stabilized temperature and the second preset temperature. Where Lc' = Lc × [1 + (Ts - T2) / T2], Lc is the initial cooling circulation velocity of the cooling pipe layer, Lc' is the adjusted cooling circulation velocity of the cooling pipe layer, Ts is the real-time stabilized temperature, and T2 is the second preset temperature.

7. The hydrogen booster device based on multi-stage compression technology according to claim 6, characterized in that, When the air pressure in the pressure stabilizing chamber is in an overpressure state and the temperature in the pressure stabilizing chamber is in a critical state, the central control module adjusts the initial cooling circulation flow rate Lc in the cooling pipe layer to Lc”, Lc”=Lc×[1+(Ts-T1) / T1], where Lc” is the cooling circulation flow rate of the cooling pipe layer after adjustment in the critical state, and T1 is the first preset temperature; The critical state is defined as a real-time stabilized temperature that is greater than a first preset temperature and less than a second preset temperature.

8. The hydrogen booster device based on multi-stage compression technology according to claim 1, characterized in that, It also includes the nose cone and several monitoring units; The machine head is located at one end of the frame, and a drive source is installed inside the machine head. The drive source outputs power through the output shaft. The two ends of the output shaft are respectively connected to the machine head and the shaft support located at the other end of the frame. The output shaft is also connected to the plurality of series-connected booster units to provide power output to each booster unit. The number of monitoring units is set in accordance with the number of pressurization units; each monitoring unit includes a first pressure sensor installed in the compression chamber to detect the real-time compressed air pressure, a second pressure sensor installed in the pressure stabilizing chamber to detect the real-time stabilized air pressure, and a temperature sensor installed in the pressure stabilizing chamber to detect the real-time stabilized temperature.

9. The hydrogen booster device based on multi-stage compression technology according to claim 1, characterized in that, The cooling pipe layer is nested inside the pressure stabilizing pipe. One end of the pressure stabilizing pipe is provided with a fixed pipe plug plate, and the other end is the removable pipe plug plate. A pressure stabilizing inlet is opened at the axial position of the fixed pipe plug plate. An extension air nozzle extending into the inside of the pressure stabilizing pipe is provided on the pressure stabilizing inlet. The pressure control plunger is sleeved on the extension air nozzle through a through hole on its own axis. A control device is provided on one side of the fixed pipe plug, and a telescopic hydraulic cylinder is provided on the control device. The telescopic hydraulic cylinder passes through the fixed pipe plug and is connected to the pressure control plunger. Multiple turns of cooling circulation pipe are wound around the cooling pipe layer. The cooling circulation pipe is connected to a circulation machine located outside the pressure stabilizing pipe. The circulation machine is connected to the output shaft through a pressure stabilizing differential gearbox. The differential speed of the pressure stabilizing differential gearbox is adjustable.

10. A method for hydrogen pressurization using the hydrogen pressurization device based on multi-stage compression technology according to any one of claims 1 to 9, characterized in that, include Step S1: Set up several booster sections composed of the vortex pipe and the pressure stabilizing pipe, connect the output direction of the pressure stabilizing pipe to the input direction of the vortex pipe, and then connect the output of the vortex pipe of any booster section to the input of the pressure stabilizing pipe of another booster section, so that the booster sections are connected in series. Step S2: Obtain the real-time compressed air pressure in any of the booster chambers through the central control module, and determine whether the air pressure in the chamber is stable according to the set standard pressure range; Step S3: When the air pressure in the compression chamber is unstable, the real-time stabilizing air pressure in the stabilizing chamber is determined according to the standard pressure range to determine the pressure state in the stabilizing chamber. Step S4: When the pressure stabilizing chamber is in an overpressure state, the speed of the drive shaft of the moving scroll disk is adjusted by the compression differential box; Step S5: When the pressure stabilizing chamber is in a low-pressure state and the pressure boosting section is not the front-end pressure boosting section, the pressure control plunger is controlled to move and compress the volume of the pressure stabilizing chamber to adjust the real-time pressure stabilizing air pressure of the pressure stabilizing chamber.

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