A diaphragm compressor energy comprehensive utilization system and method for hydrogen refueling station

Abstract

The application discloses a diaphragm compressor energy comprehensive utilization system and method for hydrogen refueling station, which comprises a cooling water system, a compressor system, a heat conduction system and a heat exchanger connected through pipelines. The cooling water system comprises a cooling water unit circulating pump, a first valve, a second valve and a third valve, which are used for circulating cooling water in the compressor system and the heat exchanger; the compressor system comprises a main oil tank, an auxiliary oil tank, an oil pump and a fourth valve, the fourth valve is connected between the main oil tank and the auxiliary oil tank, and is used for heat exchange of lubricating oil between the main oil tank and the auxiliary oil tank, so that the oil temperature in the auxiliary oil tank reaches a compressor starting temperature; the heat conduction system comprises a compressor control valve group, a fifth valve and a sixth valve, and a frame and an inner cavity of the compressor control valve group constitute a heat conduction device; and the heat exchanger comprises one or more heat exchange cavities and corresponding control valves. The scheme can improve compressor energy utilization rate and reduce dependence on external heat preservation devices.

Description

Technical Field

[0001] This invention relates to the field of diaphragm compressor technology for hydrogen refueling stations, and specifically to an energy comprehensive utilization system and method for diaphragm compressors used in hydrogen refueling stations. Background Technology

[0002] With the increasing number of fuel cell vehicles, the number of hydrogen refueling stations is also gradually increasing. The core equipment of a hydrogen refueling station includes a hydrogen compressor, a sequential control cabinet, and hydrogen storage tanks. During normal operation of the hydrogen compressor, heat generation is mainly concentrated in the diaphragm head, lubricating oil, and pressurized hydrogen. The pressurized hydrogen can reach temperatures above 100 degrees Celsius, requiring a chiller to cool it down at such high temperatures.

[0003] Furthermore, during the initial operation of the diaphragm compressor under extremely cold conditions, some internal components such as electric valves and instruments cannot function properly, requiring an electric heating system to heat the lubricating oil, which brings additional power consumption to the diaphragm compressor. Summary of the Invention

[0004] To improve the energy utilization rate of the compressor and reduce external energy consumption, this solution provides a comprehensive energy utilization system and method for diaphragm compressors used in hydrogen refueling stations. By transferring the high heat generated during the operation of the diaphragm compressor to the valves and instruments that require insulation through heat transfer oil, the system can replace additional insulation devices in stages. The high-pressure hydrogen is cooled by a heat exchanger, which can improve the energy utilization rate of the diaphragm compressor and reduce the dependence on external insulation devices.

[0005] According to a first aspect of the present invention, a diaphragm compressor energy utilization system for hydrogen refueling stations is provided, comprising: a cooling water system, a compressor system, a heat conduction system, and a heat exchanger connected by pipelines.

[0006] The cooling water system includes a chiller unit circulating pump, a first valve, a second valve, and a third valve, used to circulate cooling water in the compressor system and heat exchanger; the compressor system includes a main oil tank, an auxiliary oil tank, an oil pump, and a fourth valve, which connects the main oil tank and the auxiliary oil tank to allow the lubricating oil to exchange heat between the two tanks so that the oil temperature in the auxiliary oil tank reaches the compressor starting temperature; the heat transfer system includes a compressor control valve group, a fifth valve, and a sixth valve, with the frame and inner cavity of the compressor control valve group forming a heat transfer device; the heat exchanger includes one or more heat exchange chambers and corresponding control valves.

[0007] Optionally, in the above-mentioned diaphragm compressor energy utilization system for hydrogen refueling stations, the first valve and the second valve are located on the cooling water pipeline inside the skid, and the third valve is located between the cooling water pipelines inside the skid to allow cooling water to circulate in the compressor system and heat exchanger; the fourth valve is located between the main oil tank and the auxiliary oil tank, and the volume of the main oil tank and the auxiliary oil tank is determined by heat exchange calculation based on the temperature before cooling and the temperature after cooling.

[0008] Optionally, in the above-mentioned diaphragm compressor energy comprehensive utilization system for hydrogen refueling stations, the frame of the compressor control valve group is welded from square tubes, with a frame thickness greater than 3mm. The heat conductor is used to conduct hydrogen through heat transfer oil to the frame of the control valve group, and the volume of the heat conductor is determined based on the inlet pipe temperature of the heat conductor and the second temperature threshold.

[0009] Optionally, in the above-mentioned diaphragm compressor energy utilization system for hydrogen refueling stations, cooling water is used as the heat exchange medium inside the heat exchanger, and the heat exchange area of ​​the heat exchanger is determined according to the temperature of the heat exchanger inlet pipe; the heat exchange chamber is laid on the compressor skid base, which is formed by welding horizontal and vertical beams to form spaces of different sizes, and the heat exchange chamber is installed in the spaces.

[0010] Optionally, in the above-mentioned diaphragm compressor energy utilization system for hydrogen refueling stations, temperature transmitters are installed in the circulating pump inlet pipeline, circulating pump outlet pipeline, heat transfer device inlet pipeline, inside the heat transfer device, heat transfer device outlet pipeline, inside the heat exchange chamber, heat exchange device outlet pipeline, main oil tank, and auxiliary oil tank.

[0011] According to a second aspect of the present invention, a method for comprehensive energy utilization of a diaphragm compressor for a hydrogen refueling station is provided, comprising: starting a circulating pump in a chiller unit to circulate cooling water in the cooling pipes and internal pipe network within the skid; detecting the oil temperature of the auxiliary oil tank of the compressor, and when the oil temperature of the auxiliary oil tank is lower than the compressor start-up temperature, performing heat exchange between the lubricating oil in the main oil tank and the auxiliary oil tank to reach the start-up temperature, and then starting the compressor; detecting the ambient temperature of the compressor control valve group, and when the ambient temperature is lower than a third temperature threshold, allowing hydrogen to enter the heat transfer device until the ambient temperature is higher than the third temperature threshold; detecting the hydrogen outlet temperature of the heat exchanger, and adjusting the heat exchange area of ​​the heat exchanger to make the hydrogen outlet temperature lower than a fourth temperature threshold.

[0012] Optionally, in the above-mentioned method for comprehensive energy utilization of diaphragm compressors in hydrogen refueling stations, antifreeze is added to the cooling water. After starting the circulating pump in the chiller unit, the first valve and the second valve are opened to fill the cooling water pipeline network inside the skid with cooling water. The flow switch is used to detect whether the cooling water circulation is normal. After a preset circulation time, the first valve and the second valve are closed, and the third valve is opened to connect the cooling water to the internal pipeline network.

[0013] Optionally, in the above-mentioned method for comprehensive energy utilization of diaphragm compressors used in hydrogen refueling stations, the first oil temperature of the main oil tank and the second oil temperature of the auxiliary oil tank are detected, and the first oil temperature is greater than the second oil temperature; if the second oil temperature is greater than the compressor start-up temperature, the compressor is started.

[0014] If the second oil temperature is lower than the compressor starting temperature, open the fourth valve and oil pump to allow the lubricating oil in the main oil tank to enter the auxiliary oil tank; monitor the change in the second oil temperature in the auxiliary oil tank, and when the second oil temperature is higher than the compressor starting temperature, close the fourth valve and start the compressor.

[0015] Optionally, in the above-mentioned method for comprehensive energy utilization of diaphragm compressors in hydrogen refueling stations, the fifth valve is located in the first pipeline and the sixth valve is located in the second pipeline. When the ambient temperature of the control valve group is less than the third temperature threshold, the fifth valve is opened and the sixth valve is closed, allowing hydrogen to enter the heat conductor from the first pipeline. It is determined whether the ambient temperature is greater than the second temperature threshold. When the ambient temperature is lower than the second temperature threshold, an alarm is triggered. When the ambient temperature is greater than the third temperature threshold, the fifth valve is closed and the sixth valve is opened, allowing hydrogen to enter the second pipeline.

[0016] Optionally, in the above-mentioned method for comprehensive energy utilization of diaphragm compressors in hydrogen refueling stations, the required heat exchange area of ​​the heat exchanger is calculated based on the hydrogen inlet temperature of the heat exchanger; based on the required heat exchange area of ​​the heat exchanger, the corresponding control valve is opened to enter the corresponding heat exchange chamber; the hydrogen outlet temperature of the heat exchanger is detected, and the correctness of the heat exchange area of ​​the heat exchanger is determined by comparing the hydrogen outlet temperature of the heat exchanger with a fourth temperature threshold; the temperature transmitter in the heat exchanger is set to issue an alarm signal when it is higher than the fourth temperature threshold, and the second valve is opened and the first valve is closed.

[0017] According to the present invention, the high heat generated during the operation of the compressor is transferred to the valves and instruments that require heat preservation via heat transfer oil, thereby replacing the additional heat preservation device in stages. During the transfer process, the purpose of cooling the high-pressure hydrogen is achieved through a heat exchanger.

[0018] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0019] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0020] Figure 1A schematic diagram of the topology of a diaphragm compressor energy utilization system for a hydrogen refueling station according to an embodiment of the present invention is shown.

[0021] Figure 2 A schematic diagram of the internal structure of a compressor according to an embodiment of the present invention is shown;

[0022] Figure 3 A schematic flowchart of a method 200 for comprehensive energy utilization of a diaphragm compressor for a hydrogen refueling station, according to an embodiment of the present invention, is shown. Detailed Implementation

[0023] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0024] In extremely cold conditions, the hydrogen compressor requires an electric heating system to heat the lubricating oil during initial operation to ensure a smooth start-up. Once the lubricating oil temperature meets the startup requirements, heating is stopped. At this point, the compressor operates normally, and the heat continues to increase, necessitating the use of a chiller to cool the high-temperature hydrogen.

[0025] To improve the energy utilization rate of the compressor, this solution provides a comprehensive energy utilization method and system for diaphragm compressors used in hydrogen refueling stations. By transferring the high-heat hydrogen during the compressor operation to the valves and instruments that require heat preservation through heat transfer oil, the system can replace additional heat preservation devices in stages. During the transfer process, the high-pressure hydrogen is also cooled, thereby improving the energy utilization rate of the compressor operation.

[0026] Figure 1 A schematic diagram of the topology of a diaphragm compressor energy utilization system for a hydrogen refueling station according to an embodiment of the present invention is shown. Figure 1 As shown, the diaphragm compressor energy utilization system for hydrogen refueling stations includes a cooling water system, a compressor system, a heat conduction system, and a heat exchanger connected by pipelines.

[0027] The cooling water system includes a chiller unit circulating pump 5.1, a first valve 5.13, a second valve 5.5, and a third valve 5.12. The first valve 5.13 and the second valve 5.5 are located on the chilled water pipeline inside the skid, and the third valve 5.12 is located between the chilled water pipelines inside the skid, used to circulate the cooling water in the compressor system and the heat exchanger. Figure 1 The dashed line represents the internal cooling water circulation pipes. As shown by the dashed line, the cooling water system allows cooling water to circulate in the compressor system and heat exchanger.

[0028] Antifreeze is added to the cooling water. When the compressor starts running for the first time, the first valve 5.13 and the second valve 5.5 are opened to fill the cooling water network inside the skid with cooling water. The flow switch is used to check whether the cooling water circulation is normal.

[0029] After the preset cycle time, close the first valve 5.13 and the second valve 5.5, and open the third valve 5.12 to connect the cooling water to the internal pipe network, which facilitates the diffusion of internal cooling water temperature and ensures the cooling effect.

[0030] The compressor system includes a main oil tank, an auxiliary oil tank, an oil pump, and a fourth valve. The fourth valve connects the main and auxiliary oil tanks and facilitates heat exchange between them, ensuring that the oil temperature in the auxiliary oil tank reaches the compressor's starting temperature. The volumes of the main and auxiliary oil tanks can be determined based on heat exchange calculations using the temperatures before and after cooling.

[0031] Figure 2 A schematic diagram of the internal structure of the compressor system is shown. (See diagram below.) Figure 2 As shown, the compressor system includes a main oil tank 2.4, an auxiliary oil tank 2.2, a fourth valve 2.5 connecting the main oil tank 2.4 and the auxiliary oil tank 2.2, and an oil pump 2.6. The main oil tank 2.4 is an insulated oil tank, storing the uncooled portion of the lubricating oil from the previous pressurization. The auxiliary oil tank 2.2 is the compressor's commonly used oil tank.

[0032] The oil temperature in the main oil tank 2.4 can be detected using temperature transmitter TT2.3, and the oil temperature in the auxiliary oil tank 2.2 can be detected using temperature transmitter TT2.1. The volumes of the main oil tank 2.4 and the auxiliary oil tank 2.2 are determined by heat exchange calculations based on the temperatures of the lubricating oil before and after cooling.

[0033] The heat transfer system includes compressor control valve group 4, fifth valve 3.5, and sixth valve 3.6. The compressor system and the heat transfer system are connected by pipe 3, which branches into two lines: first pipe 3.1 and second pipe 3.2. The hydrogen gas in pipe 3 is high-temperature hydrogen, typically reaching 150℃. This temperature remains constant with minimal fluctuations as long as the compressor is running. This heat is transferred to the skid 6 to maintain a temperature above a certain level, replacing the need for external insulation.

[0034] Because the compressor skid 6 is relatively large, in order to ensure the insulation effect, the valves that are susceptible to the influence of ambient temperature are concentrated in the structural layout. After analysis, the valves that are susceptible to the influence of the environment are mainly concentrated on the compressor control valve group 4.

[0035] Control valve assembly 4 is a self-contained structure with controllable dimensions, thus requiring minimal modifications to the internal structure of the compressor skid. The frame of control valve assembly 4 is constructed from welded square tubing. To prevent hydrogen from entering the internal cavity, all welds are full welds, ensuring a good seal. Furthermore, to meet structural strength requirements, the frame wall thickness is at least 3mm, capable of withstanding the ambient temperature transmitter TT4.3 mounted on the low-pressure medium control valve assembly.

[0036] The frame and inner cavity of the compressor control valve assembly together form a heat conductor, which is used to conduct hydrogen gas through heat transfer oil to the frame of the control valve assembly. The volume of the heat conductor is determined based on the inlet pipe temperature and the second temperature threshold.

[0037] The heat exchange system includes a heat exchanger 5.3, which comprises one or more heat exchange chambers and corresponding control valves. The heat exchanger and the heat transfer fluid are connected by a pipe 3.4. The heat exchange chambers are located on the compressor skid base, which is formed by welding horizontal and vertical beams to create spaces of varying sizes. The heat exchange chambers are installed within these spaces, saving internal space within the compressor skid.

[0038] The heat exchanger 5.3 uses cooling water as the heat exchange medium and employs a coil to exchange heat with the hydrogen in the hydrogen pipeline 3.4.

[0039] Temperature transmitters are installed in the circulating pump cooling lines, the heat exchanger inlet lines, inside the heat exchanger, the heat exchanger outlet lines, inside the heat exchange chamber, the heat exchanger outlet lines, the main oil tank, and the auxiliary oil tank. Figure 1 (Middle part not shown).

[0040] like Figure 1 As shown, a temperature transmitter TT3.2 is installed in the inlet pipe 3 of the heat conductor, a temperature transmitter TT4.3 is installed inside the heat conductor 4.1, a temperature transmitter TT3.3 is installed in the outlet pipe 3.4 of the heat conductor, and temperature transmitters TT5.3, TT5.2 and TT5.1 are installed inside multiple heat exchange chambers respectively.

[0041] Figure 3 A schematic flow diagram of a method 300 for comprehensive energy utilization of a diaphragm compressor in a hydrogen refueling station, according to an embodiment of the present invention, is shown. Figure 3 As shown, start the circulating pump in the chiller unit to circulate the cooling water in the cooling pipes and internal pipe network inside the skid.

[0042] First, before compressor 2 starts running, the circulating pump 5.1 in the chiller unit is started. At this time, the cooling water is not cooling water in the conventional sense. Due to the low outside temperature and the low water temperature, antifreeze is added to the cooling water to prevent it from freezing and to reduce the operating cost of the chiller unit.

[0043] After starting the circulating pump in the chiller unit, open the first valve 5.13 and the second valve 5.5 to fill the chiller water network inside the skid with cooling water. Check the cooling water circulation flow using a flow switch to ensure it is normal. After a preset circulation time, close the first valve 5.13 and the second valve 5.5, and open the third valve 5.12 to connect the cooling water to the internal piping network. At this point, the water circulation is within the skid. When the compressor is shut down for an extended period, the water returns to the external chiller unit's water tank.

[0044] Then, step S320 is executed to detect the oil temperature of the compressor's auxiliary oil tank. When the oil temperature of the auxiliary oil tank is lower than the compressor's starting temperature, the lubricating oil in the main oil tank and the auxiliary oil tank undergoes heat exchange to reach the starting temperature, and then the compressor is started.

[0045] Specifically, the first oil temperature in the main oil tank and the second oil temperature in the auxiliary oil tank can be detected by temperature transmitters TT2.3 and TT2.1, respectively. Since the main oil tank 2.4 is an insulated oil tank, the lubricating oil stored inside is the uncooled portion after the last pressurization, and the auxiliary oil tank 2.1 has the common oil tank structure of the compressor, the first oil temperature is higher than the second oil temperature.

[0046] If the second oil temperature is greater than the compressor starting temperature T1, then the compressor 2 is started directly; if the second oil temperature is less than the compressor starting temperature T1, then the fourth valve 2.5 and the oil pump 2.6 are opened to allow the lubricating oil in the main oil tank 2.4 to enter the auxiliary oil tank 2.2.

[0047] The change in the second oil temperature in the auxiliary oil tank 2.2 is monitored. When the second oil temperature is greater than the compressor start-up temperature T1, the fourth valve 2.5 is closed, and the compressor 2 is started. Hydrogen gas enters the compressor 2 through pipeline 1.

[0048] Next, step S330 is executed to detect the ambient temperature of the compressor control valve group. When the ambient temperature is less than the third temperature threshold, hydrogen is introduced into the heat transfer device until the ambient temperature is greater than the third temperature threshold.

[0049] The ambient temperature of the control valve group can be detected by the temperature transmitter TT4.3. When the ambient temperature of the control valve group is less than the third temperature threshold T3, the fifth valve 3.5 is opened and the sixth valve 3.6 is closed, so that hydrogen gas enters the heat conductor 4.1 from the first pipeline 3.1.

[0050] Set the ambient temperature required by the valve instrument to a lower limit of the second temperature threshold T2 and a higher limit of the third temperature threshold T3. Determine if the ambient temperature is greater than the second temperature threshold T2. If the ambient temperature is lower than the second temperature threshold T2, trigger an alarm. If the ambient temperature is greater than the third temperature threshold T3, close the fifth valve 3.5 and open the sixth valve 3.6 to allow hydrogen to enter the second pipeline 3.2.

[0051] Finally, step S340 is executed to detect the hydrogen outlet temperature of the heat exchanger and adjust the heat exchange area of ​​the heat exchanger so that the hydrogen outlet temperature is lower than the fourth temperature threshold.

[0052] A temperature transmitter TT3.3 is installed at the hydrogen inlet pipe 3.4 of the heat exchanger to detect the hydrogen inlet temperature, and a temperature transmitter TT3.5 is installed at the hydrogen outlet pipe 3.5 of the heat exchanger to detect the hydrogen outlet temperature.

[0053] Based on the temperature value of TT3.3, the system automatically calculates the required heat exchange area, matches different heat exchange chambers, and opens or closes the corresponding valves 5.3.1, 5.3.2, and 5.3.3.

[0054] Set the fourth temperature threshold to T4. Compare the hydrogen outlet temperature TT3.5 of the heat exchanger with T4 to verify whether the selected heat exchange area of ​​the system is correct. The heat obtained by heat exchanger 5.3 is carried by the cold water pipeline to the piping network arranged in the skid, bringing heat to the interior of the skid.

[0055] The compressor skid door panel is generally made of sheet metal, using a semi-enclosed structure formed by the flanges of the sheet metal, and filled with insulation cotton to keep the entire skid warm. Hydrogen gas that meets the temperature requirements enters the downstream system of the compressor through pipeline 3.5.

[0056] The temperature transmitter in the heat exchanger is set to issue an alarm signal when the temperature exceeds the fourth temperature threshold, opening the second valve and closing the first valve.

[0057] To ensure that the hydrogen outlet temperature does not exceed TT3.5 or the set value T4, the heat exchange capacity is calculated, and a high-temperature alarm is set for the temperature transmitter in the heat exchanger. When a high-temperature alarm is triggered, the second valve 5.5 is opened, and the first valve 5.12 is closed to supply low-temperature cooling water to the internal piping network. After the alarm has subsided and stabilized for a certain period of time, the second valve 5.5 is closed.

[0058] The energy comprehensive utilization system and method for diaphragm compressors used in hydrogen refueling stations provided by the present invention transfers the high heat generated during the operation of the compressor to valves and instruments that require heat preservation through heat transfer oil, thereby replacing additional heat preservation devices in stages. During the transfer process, the purpose of cooling high-pressure hydrogen is achieved through a heat exchanger.

[0059] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0060] Similarly, it should be understood that, in order to streamline this disclosure and aid in understanding one or more of the various aspects of the invention, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof. However, this method of disclosure should not be interpreted as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as reflected in the following claims, inventive aspects lie in fewer than all features of a single foregoing disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into this detailed description, wherein each claim itself is a separate embodiment of the invention.

[0061] Those skilled in the art will understand that modules, units, or components of the devices disclosed in the examples herein can be arranged in the devices described in this embodiment, or alternatively, can be located in one or more devices different from the devices in this example. The modules in the foregoing examples can be combined into a single module or, in addition, can be divided into multiple sub-modules.

[0062] Those skilled in the art will understand that modules in the device of the embodiments can be adaptively changed and placed in one or more devices different from that embodiment. Modules, units, or components in the embodiments can be combined into a single module, unit, or component, and further, they can be divided into multiple sub-modules, sub-units, or sub-components. Except where at least some of such features and / or processes or units are mutually exclusive, any combination can be used to combine all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or units of any method or device so disclosed. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature that serves the same, equivalent, or similar purpose.

[0063] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features but not others included in other embodiments, combinations of features from different embodiments are intended to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments can be used in any combination.

[0064] Furthermore, some of the embodiments described herein are methods or combinations of method elements that can be implemented by a processor of a computer system or by other means of performing functions. Therefore, a processor having the necessary instructions for implementing a method or method element forms a means for implementing that method or method element. Furthermore, the elements of the apparatus embodiments herein are examples of means for implementing functions performed by elements for the purposes of carrying out the invention.

[0065] As used herein, unless otherwise specified, the use of ordinal numbers such as “first,” “second,” “third,” etc., to describe ordinary objects merely indicates different instances of similar objects and is not intended to imply that the objects being described must have a given order in time, space, ordering, or any other manner.

[0066] Although the invention has been described with respect to a limited number of embodiments, those skilled in the art will understand from the foregoing description that other embodiments are conceivable within the scope of the invention described herein. Furthermore, it should be noted that the language used in this specification has been chosen primarily for readability and edibility purposes, and not for the purpose of interpreting or limiting the subject matter of the invention. Therefore, many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the appended claims. The disclosure of the invention is illustrative rather than restrictive, and the scope of the invention is defined by the appended claims.

Claims

1. A comprehensive energy utilization system for a diaphragm compressor used in a hydrogen refueling station, characterized in that, include: The cooling water system, compressor system, heat transfer system, and heat exchanger are connected by pipelines. The cooling water system includes a chiller unit circulation pump, a first valve, a second valve, and a third valve, used to circulate cooling water in the compressor system and heat exchanger; The compressor system includes a main oil tank, an auxiliary oil tank, an oil pump, and a fourth valve. The fourth valve is connected between the main oil tank and the auxiliary oil tank and is used to allow the lubricating oil to exchange heat between the main oil tank and the auxiliary oil tank so that the oil temperature in the auxiliary oil tank reaches the compressor starting temperature. The volumes of the main oil tank and the auxiliary oil tank are determined based on heat exchange calculations using the temperatures before and after cooling. The heat conduction system includes a compressor control valve group, a fifth valve, and a sixth valve. The frame and inner cavity of the compressor control valve group constitute a heat conductor. The fifth valve is located in the first pipeline, and the sixth valve is located in the second pipeline. The heat exchanger includes one or more heat exchange chambers and corresponding control valves; The frame of the compressor control valve group is welded from square tubes, and the frame thickness is greater than 3mm. The heat conductor is used to conduct hydrogen gas to the frame of the control valve group through heat transfer oil. The volume of the heat conductor is determined according to the inlet pipe temperature of the heat conductor and the second temperature threshold. The first valve and the second valve are located on the cold water pipeline inside the skid, and the third valve is located between the cold water pipelines inside the skid. The heat exchanger uses cooling water as the heat exchange medium, and the heat exchange area of ​​the heat exchanger is determined according to the temperature of the heat exchanger inlet pipe. The heat exchange chamber is arranged on the compressor skid base, which is formed by welding horizontal and vertical beams to create spaces of different sizes. The heat exchange chamber is installed in the spaces. Specifically, when the ambient temperature of the control valve group is less than the third temperature threshold, the fifth valve is opened and the sixth valve is closed, allowing hydrogen to enter the heat conductor from the first pipeline; it is determined whether the ambient temperature is greater than the second temperature threshold. When the ambient temperature is lower than the second temperature threshold, an alarm is triggered. When the ambient temperature is greater than the third temperature threshold, the fifth valve is closed and the sixth valve is opened, allowing hydrogen to enter the second pipeline. The process involves calculating the required heat exchanger area based on the hydrogen inlet temperature; opening the corresponding control valve to access the corresponding heat exchange chamber based on the required heat exchanger area; detecting the hydrogen outlet temperature of the heat exchanger and comparing it with a fourth temperature threshold to determine if the heat exchanger area is correct; and setting the temperature transmitter in the heat exchanger to issue an alarm signal when the temperature exceeds the fourth temperature threshold, opening the second valve and closing the first valve.

2. The energy comprehensive utilization system for a diaphragm compressor at a hydrogen refueling station according to claim 1, characterized in that, Temperature transmitters are installed in the circulating pump cooling pipeline, the heat exchanger inlet pipeline, the inside of the heat exchanger, the heat exchanger outlet pipeline, the inside of the heat exchange chamber, the heat exchanger outlet pipeline, the main oil tank, and the auxiliary oil tank.

3. A method for comprehensive energy utilization of a diaphragm compressor for a hydrogen refueling station, suitable for execution in the comprehensive energy utilization system for a diaphragm compressor for a hydrogen refueling station as described in any one of claims 1 to 2, characterized in that, include: Start the circulating pump in the chiller unit to circulate the cooling water in the cooling pipes and internal pipe network inside the skid; The oil temperature in the auxiliary oil tank of the compressor is detected. When the oil temperature in the auxiliary oil tank is lower than the compressor starting temperature, the lubricating oil in the main oil tank and the auxiliary oil tank is heat-exchanged to reach the starting temperature, and then the compressor is started. The ambient temperature of the compressor control valve group is detected. When the ambient temperature is less than the third temperature threshold, hydrogen is introduced into the heat exchanger until the ambient temperature is greater than the third temperature threshold. The hydrogen outlet temperature of the heat exchanger is detected, and the heat exchange area of ​​the heat exchanger is adjusted to make the hydrogen outlet temperature less than the fourth temperature threshold.

4. The method for comprehensive energy utilization of a diaphragm compressor for a hydrogen refueling station according to claim 3, characterized in that, The cooling water contains antifreeze. The step of starting the circulation pump in the chiller unit to circulate the cooling water in the cooling pipes and internal pipe network of the skid includes: after starting the circulation pump in the chiller unit, opening the first valve and the second valve to fill the cooling water pipe network inside the skid with cooling water, and checking whether the cooling water circulation is normal by using a flow switch; after circulating for a preset time, closing the first valve and the second valve, and opening the third valve to connect the cooling water to the internal pipe network.

5. The method for comprehensive energy utilization of a diaphragm compressor for a hydrogen refueling station according to claim 3, characterized in that, The steps for detecting the oil temperature in the auxiliary oil tank of the compressor, and starting the compressor after the lubricating oil in the main oil tank and the auxiliary oil tank undergoes heat exchange to reach the starting temperature when the auxiliary oil tank temperature is lower than the compressor starting temperature, include: detecting the first oil temperature in the main oil tank and the second oil temperature in the auxiliary oil tank, wherein the first oil temperature is greater than the second oil temperature; if the second oil temperature is greater than the compressor starting temperature, then starting the compressor; if the second oil temperature is less than the compressor starting temperature, then opening the fourth valve and the oil pump to allow the lubricating oil in the main oil tank to enter the auxiliary oil tank; detecting the change in the second oil temperature in the auxiliary oil tank, and when the second oil temperature is greater than the compressor starting temperature, closing the fourth valve and starting the compressor.

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