Hydrogen drying system and drying method

Abstract

The invention provides a hydrogen drying system and a drying method. The hydrogen lossless drying system comprises at least two drying modules used for drying raw material hydrogen; the raw material hydrogen main inlet pipe (H1) is used for providing raw material hydrogen for the at least two drying modules; the product hydrogen total outlet pipe (H9) is used for outputting the product hydrogen treated by the at least two drying modules; and the pipeline assembly comprises a hydrogen pipeline and a valve arranged on the hydrogen pipeline, and is used for controlling the flow direction and the flow rate of the raw material hydrogen so as to realize the switching of a series connection state, a parallel connection state or a hot standby state between the at least two drying modules. According to the hydrogen drying system, the load range of hydrogen purification can be widened, and the hydrogen purity is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen purification, and in particular to a hydrogen drying system and a drying method. Background Art

[0002] As a clean and efficient energy carrier, hydrogen purification technology plays a vital role in the hydrogen energy industry chain. The main task of the hydrogen purification system is to remove moisture, carbon dioxide, carbon monoxide and other impurities from the raw hydrogen to ensure that the product hydrogen meets specific purity requirements and is suitable for different industrial applications and fuel cells. However, in the actual operation of the hydrogen purification system, the supply stability of the raw hydrogen has become a key factor restricting its performance.

[0003] The unstable supply of raw hydrogen is mainly due to the volatility of the front-end hydrogen production process. Taking the production of hydrogen by electrolysis of water driven by renewable energy as an example, the output of photovoltaic and wind power generation is affected by weather and time factors, resulting in wide fluctuations in the production of hydrogen by electrolysis of water. This volatility is not only reflected in the fluctuation of the total amount of hydrogen, but also in the instantaneous change of hydrogen flow rate, that is, the fluctuation of flow load. The wide fluctuation of the raw hydrogen flow load exceeds the load range designed for the hydrogen purification system, which has become a problem that needs to be solved urgently.

[0004] At present, the solutions for raw hydrogen flow load fluctuations in hydrogen purification systems on the market are focused on the internal optimization of a single drying module. For example, some patents set a flow meter in the regeneration circuit of the drying module and replace the raw hydrogen inlet valve with a flow control valve to achieve dynamic adjustment of the regeneration flow rate, thereby adapting to the volatility of raw hydrogen. However, these solutions have a limited adjustment range, especially under low-load conditions, and cannot effectively control the operating state of the drying module, resulting in reduced purification efficiency and substandard product hydrogen purity. Summary of the invention

[0005] The main purpose of the present invention is to provide a hydrogen drying system and a drying method, which can widen the load range of hydrogen purification and improve the purity of hydrogen.

[0006] In order to achieve the above object, according to one aspect of the present invention, a hydrogen lossless drying system is provided, comprising:

[0007] At least two drying modules, used for drying the raw hydrogen;

[0008] A raw hydrogen main inlet pipe, used to provide raw hydrogen to at least two drying modules;

[0009] A product hydrogen main outlet pipe, used for outputting product hydrogen after being processed by at least two drying modules; and

[0010] The pipeline assembly includes a hydrogen pipeline and a valve arranged on the hydrogen pipeline, which is used to control the flow direction and flow rate of the raw hydrogen to realize the switching of series connection, parallel connection or hot standby state between at least two drying modules.

[0011] Further, the at least two drying modules include a first drying module and a second drying module,

[0012] The hydrogen pipeline includes:

[0013] A first inlet pipe, a first end of which is connected to the main inlet pipe of raw hydrogen, and a second end of which is connected to the inlet of the first drying module;

[0014] a first shunt pipe, a first end of which is connected to an outlet of the first drying module;

[0015] A first reflux pipe, having a first end connected to the connection between the raw hydrogen main inlet pipe and the first inlet pipe, and a second end connected to the second end of the first splitter pipe;

[0016] A second inlet pipe, a first end of which is connected to the connection between the first reflux pipe and the first diversion pipe, and a second end of which is connected to the inlet of the second drying module;

[0017] A second reflux pipe, a first end of which is connected to the outlet of the second drying module, and a second end of which is connected to the inlet of the first drying module;

[0018] A first outlet pipe, a first end of which is connected to the outlet of the first drying module, and a second end of which is connected to the product hydrogen main outlet pipe;

[0019] The second outlet pipe has a first end connected to the outlet of the second drying module and a second end connected to the product hydrogen main outlet pipe.

[0020] Further, the valve comprises:

[0021] A first inlet valve, disposed on the first inlet pipe;

[0022] A first outlet valve, arranged on the first outlet pipe;

[0023] A first diverter valve, arranged on the first diverter pipe;

[0024] A second inlet valve, disposed on the second inlet pipe;

[0025] A first reflux valve, arranged on the first reflux pipe;

[0026] A second outlet valve, disposed on the second outlet pipe;

[0027] The second reflux valve is arranged on the second reflux pipe.

[0028] Furthermore, at least two drying modules include a first drying module and a second drying module, the first drying module includes a first flow detection pipeline and a first inlet pipeline, the first flow detection pipeline is provided with a first flow meter, and the first inlet pipeline is provided with a first flow regulating valve, the second drying module includes a second flow detection pipeline and a second inlet pipeline, the second flow detection pipeline is provided with a second flow meter and a second flow regulating valve.

[0029] Further, the drying module includes a dryer, a heater and a cooler; and / or, the performance of each drying module is the same.

[0030] Furthermore, a power system is provided on the first shunt pipe, and the first return valve or the second inlet valve is a flow regulating valve.

[0031] Furthermore, the hydrogen drying system also includes an instrument purge valve, and the instrument purge valve corresponding to the drying module in the hot standby state is opened to a preset opening.

[0032] According to another aspect of the present invention, there is provided a drying method of the above-mentioned hydrogen drying system, comprising:

[0033] Obtain the front-end hydrogen production load;

[0034] When the fluctuation range of the front-end hydrogen production load exceeds a preset range, at least two of the at least two drying modules are controlled to switch to a series state or a parallel state;

[0035] When the fluctuation range of the front-end hydrogen production load is within a preset range, at least one of the at least two drying modules is controlled to switch to a hot standby state.

[0036] Further, when the fluctuation range of the front-end hydrogen production load exceeds a preset range, the step of controlling at least two of the at least two drying modules to switch to a series state or a parallel state includes:

[0037] When the front-end hydrogen production load is insufficient, the control pipeline assembly switches at least two of the at least two drying modules to a series state;

[0038] When the front-end hydrogen production load is too high, the control pipeline assembly switches at least two of the at least two drying modules to a parallel state.

[0039] Further, when the fluctuation range of the front-end hydrogen production load is within a preset range, the step of controlling at least one of the at least two drying modules to switch to a hot standby state includes:

[0040] Acquiring the drying efficiency of each drying module in at least one drying module to be switched to a hot standby state;

[0041] comparing the drying efficiency of at least one drying module to be switched to the hot standby state with a preset first drying efficiency threshold;

[0042] If the drying efficiency of a drying module is lower than a preset first drying efficiency threshold, the drying module is controlled to be in a regeneration state until the drying efficiency of the drying module reaches a preset second drying efficiency threshold, wherein the second drying efficiency threshold is greater than the first drying efficiency threshold;

[0043] If the drying efficiency of at least one drying module to be switched to the hot standby state is greater than a preset first drying efficiency threshold, the at least one drying module to be switched to the hot standby state is controlled to switch to the hot standby state.

[0044] Further, when at least one drying module to be switched to the hot standby state is switched to the hot standby state, the instrument purge valve corresponding to the drying module in the hot standby state is controlled to open to a preset opening.

[0045] Furthermore, when the fluctuation range of the front-end hydrogen production load is within a preset range, the step of controlling at least one of the at least two drying modules to switch to a hot standby state further includes:

[0046] Obtain the drying efficiency of each drying module;

[0047] Comparing the drying efficiency of each drying module with a preset first drying efficiency threshold;

[0048] When the drying efficiency of at least one drying module is less than a preset first drying efficiency threshold, the at least one drying module is set as a drying module to be switched to a hot standby state, and the at least one drying module is controlled to be set in a regeneration state until the drying efficiency of the drying module reaches a preset second drying efficiency threshold, wherein the second drying efficiency threshold is greater than the first drying efficiency threshold;

[0049] The at least one drying module is controlled to be in a hot standby state.

[0050] Furthermore, the drying method further comprises:

[0051] Obtain the drying efficiency of each drying module;

[0052] Comparing the drying efficiency of each drying module with a preset first drying efficiency threshold;

[0053] When the drying efficiency of at least one drying module is less than a preset first drying efficiency threshold, controlling the at least one drying module to be set in a regeneration state until the drying efficiency of the drying module reaches a preset second drying efficiency threshold;

[0054] The drying module that has reached the preset second drying efficiency threshold is controlled to be in a normal operating state.

[0055] By applying the technical solution of the present invention, when at least two drying modules are connected in series, a regeneration gas can be shared, reducing the flow rate required for regeneration, thereby reducing the lower limit of hydrogen production load, ensuring the regeneration capacity of the equipment, and increasing the purity of the output hydrogen; when at least two drying modules are connected in parallel, the raw hydrogen enters at least two drying modules at a low flow rate, reducing the drying load of each drying module, thereby also increasing the purity of the output hydrogen. On the premise that the purity of the product hydrogen remains unchanged, when at least two or more drying modules are connected in series, the regeneration load borne by the entire drying system is reduced exponentially, reducing the lower limit of the load adjustable range; when at least two or more drying modules are connected in parallel, the raw hydrogen enters at least two drying modules at half the flow rate, increasing the upper limit of the load adjustable range of the parallel drying combination system. Through the above structure, the present invention can reduce the lower limit of hydrogen production load fluctuation under the premise that the production cost allows, and at the same time increase the upper limit of hydrogen production load fluctuation, can adapt to the supply of raw hydrogen with a wider load range, widen the load range of hydrogen purification, and improve hydrogen purification efficiency and hydrogen purity. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0057] Figure 1 is an overall structural block diagram of the hydrogen drying system of an embodiment of the present application;

[0058] Figure 2 is an operating state diagram of the hydrogen drying system in the embodiment of the present application in the Z1 state;

[0059] Figure 3 is an operating state diagram of the hydrogen drying system of an embodiment of the present application in the Z2 state;

[0060] Figure 4 is an operating state diagram of the hydrogen drying system of an embodiment of the present application in the Z3 state;

[0061] Figure 5 is an operating state diagram of the hydrogen drying system of an embodiment of the present application in the Z4 state;

[0062] Figure 6 is an operating state diagram of the hydrogen drying system of an embodiment of the present application in the Z5 state;

[0063] Figure 7 is an operating state diagram of the hydrogen drying system of an embodiment of the present application in the Z6 state;

[0064] Figure 8is an operating state diagram of the hydrogen drying system of an embodiment of the present application in the Z7 state;

[0065] Fig. 9 is an implementation structure diagram of the hydrogen drying system of the embodiment of the present application; and

[0066] Fig.10 A structural diagram of a hydrogen drying system according to an embodiment of the present invention is shown.

[0067] The above drawings include the following reference numerals:

[0068] 100, first drying module; 101, first flow detection pipeline; 102, first inlet pipeline; 103, first flow meter; 200, second drying module; 201, second flow detection pipeline; 202, second inlet pipeline; 203, second flow meter; H1, total inlet pipe for raw hydrogen; H2, first inlet pipe; H3, first reflux pipe; H4, first diverter pipe; H5, first outlet pipe; H6, second inlet pipe; H7, second reflux pipe; H8, second outlet pipe; H9, total outlet pipe for product hydrogen; G1, first inlet valve; G2, first flow regulating valve; G3, first outlet valve; G4, first diverter valve; G5, second inlet valve; G6, first reflux valve; G7, second flow regulating valve; G8, second outlet valve; G9, second reflux valve. DETAILED DESCRIPTION

[0069] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0070] See also Figures 1 to 10 As shown, according to an embodiment of the present invention, the hydrogen non-destructive drying system includes: at least two drying modules, which are used to dry the raw hydrogen; a raw hydrogen total inlet pipe H1, which is used to provide raw hydrogen to the at least two drying modules; a product hydrogen total outlet pipe H9, which is used to output the product hydrogen processed by at least two drying modules; and a pipeline assembly, including a hydrogen pipeline and a valve arranged on the hydrogen pipeline, which is used to control the flow direction and flow rate of the raw hydrogen, so as to realize the switching of the series, parallel or hot standby states between the at least two drying modules.

[0071] When at least two drying modules are connected in series, they can share one regeneration gas, reduce the flow rate required for regeneration, thereby reducing the lower limit of hydrogen production load, ensuring the regeneration capacity of the equipment, and increasing the purity of the output hydrogen; when at least two drying modules are connected in parallel, the raw hydrogen enters at least two drying modules at a low flow rate, reducing the drying load of each drying module, thereby increasing the purity of the output hydrogen. Under the premise that the purity of the product hydrogen remains unchanged, when at least two or more drying modules are connected in series, the regeneration load borne by the entire drying system is reduced exponentially, reducing the lower limit of the load adjustable range; when at least two or more drying modules are connected in parallel, the raw hydrogen enters at least two drying modules at half the flow rate, increasing the upper limit of the load adjustable range of the parallel drying combination system. Through the above structure, the present invention can reduce the lower limit of hydrogen production load fluctuation under the premise that the production cost allows, and at the same time increase the upper limit of hydrogen production load fluctuation, can adapt to the supply of raw hydrogen with a wider load range, widen the load range of hydrogen purification, and improve hydrogen purification efficiency and hydrogen purity.

[0072] In one embodiment, at least two drying modules include a first drying module 100 and a second drying module 200, and the hydrogen pipeline includes: a first inlet pipe H2, a first end of which is connected to the raw hydrogen main inlet pipe H1, and a second end of which is connected to the inlet of the first drying module 100; a first branch pipe H4, a first end of which is connected to the outlet of the first drying module 100; a first return pipe H3, a first end of which is connected to the connection between the raw hydrogen main inlet pipe H1 and the first inlet pipe H2, and a second end of which is connected to the second end of the first branch pipe H4; a second inlet pipe H6, a first end of which is connected to the connection between the first return pipe H3 and the first branch pipe H4, and a second end of which is connected to the inlet of the second drying module 200; a second return pipe H7, a first end of which is connected to the outlet of the second drying module 200, and a second end of which is connected to the inlet of the first drying module 100; a first outlet pipe H5, a first end of which is connected to the outlet of the first drying module 100, and a second end of which is connected to the product hydrogen main outlet pipe H9; a second outlet pipe H8, a first end of which is connected to the outlet of the second drying module 200, and a second end of which is connected to the product hydrogen main outlet pipe H9.

[0073] In this embodiment, the drying module includes a first drying module 100 and a second drying module 200. The first drying module 100 and the second drying module 200 are connected to the raw material hydrogen main inlet pipe H1 and the product hydrogen main outlet pipe H9 through the above-mentioned hydrogen pipeline, and cooperate with the valves arranged on the hydrogen pipeline to realize the switching of the operation mode of the first drying module 100 and the second drying module 200, so that the first drying module 100 and the second drying module 200 can be in a series state or a parallel state, or one of the first drying module 100 and the second drying module 200 is operating normally and the other is in a hot standby state, thereby realizing the switching of multiple drying modes of the drying system, thereby meeting the drying requirements under different working conditions, widening the load range of hydrogen purification, and improving the hydrogen purification efficiency and hydrogen purity.

[0074] In one embodiment, the valve includes: a first inlet valve G1, which is arranged on the first inlet pipe H2; a first outlet valve G3, which is arranged on the first outlet pipe H5; a first diverter valve G4, which is arranged on the first diverter pipe H4; a second inlet valve G5, which is arranged on the second inlet pipe H6; a first reflux valve G6, which is arranged on the first reflux pipe H3; a second outlet valve G8, which is arranged on the second outlet pipe H8; and a second reflux valve G9, which is arranged on the second reflux pipe H7.

[0075] In this embodiment, by setting the above-mentioned valves, the opening and closing states of each valve can be controlled to achieve the connection combination between different hydrogen pipelines, and then realize the switching of the series connection, parallel connection or hot standby state between at least two drying modules.

[0076] In one embodiment, at least two drying modules include a first drying module 100 and a second drying module 200, the first drying module 100 includes a first flow detection pipeline 101 and a first inlet pipeline 102, the first flow detection pipeline 101 is provided with a first flow meter 103, and the first inlet pipeline 102 is provided with a first flow regulating valve G2, the second drying module 200 includes a second flow detection pipeline 201 and a second inlet pipeline 202, the second flow detection pipeline 201 is provided with a second flow meter 203, and the second inlet pipeline 202 is provided with a second flow regulating valve G7.

[0077] In this embodiment, when the first drying module 100 operates normally, the first flow detection pipeline 101 and the first inlet pipeline 102 work simultaneously, and hydrogen enters the first drying module 100 through the first flow detection pipeline 101 and the first inlet pipeline 102 for drying. When the first drying module 100 is in a regeneration state, the first flow control valve G2 on the first inlet pipeline 102 is closed, and hydrogen enters the first drying module 100 through the first flow detection pipeline 101 for regeneration. When the second drying module 200 operates normally, the second flow detection pipeline 201 and the second inlet pipeline 202 work simultaneously, and hydrogen enters the second drying module 200 through the second flow detection pipeline 201 and the second inlet pipeline 202 for drying. When the second drying module 200 is in a regeneration state, the second flow control valve G7 on the second inlet pipeline 202 is closed, and hydrogen enters the second drying module 200 through the second flow detection pipeline 201 for regeneration.

[0078] In one embodiment, the drying module includes a dryer, a heater and a cooler, and the drying module can more conveniently realize the drying and regeneration functions.

[0079] In one embodiment, the performance of each drying module is the same, which can facilitate unified control of each drying module, with higher control accuracy and simpler control procedures.

[0080] In one embodiment, a power system is disposed on the first shunt pipe H4, and the first return valve G6 or the second inlet valve G5 is a flow regulating valve.

[0081] In this embodiment, by setting up a power system and setting the first return valve G6 or the second inlet valve G5 as a flow regulating valve, the power distribution of the power system can be achieved by adjusting the opening of the first return valve G6 or the second inlet valve G5, thereby providing power when the hydrogen production module supplies insufficient hydrogen, thereby meeting the power demand for hydrogen transportation.

[0082] In one embodiment, the hydrogen drying system further includes an instrument purge valve, and the instrument purge valve corresponding to the drying module in hot standby state is opened to a preset opening.

[0083] The preset opening degree of the instrument purge valve is determined by the specifications of the instrument purge valve, and is generally consistent with the opening degree of the instrument purge valve when a conventional drying module in the related art is started, and can also be set by the user according to actual needs.

[0084] The drying module in hot standby state can slightly open the instrument purge valve to ensure that the gas passing through the instrument is always in a flow state to be detected. The instrument is always maintained in a positive pressure state. It does not need to be purged at the next startup and can be put into use directly, realizing the drying module's start-up function at any time, thereby saving the waiting time for re-purging when the drying module is restarted and avoiding waste caused by emptying.

[0085] In one embodiment, the hydrogen production module includes a first hydrogen production module P1 and a second hydrogen production module P2, wherein the first hydrogen production module P1 transmits hydrogen through a first hydrogen production pipeline H00, and the second hydrogen production module P2 transmits hydrogen through a second hydrogen production pipeline H10. The raw hydrogen produced by the first hydrogen production module P1 and the second hydrogen production module P2 respectively converge through the first hydrogen production pipeline H00 and the second hydrogen production pipeline H10 and then enter the raw hydrogen total inlet pipe H1, the raw hydrogen total inlet pipe H1 is connected to the first inlet pipe H2 and the first reflux pipe H3, the first reflux pipe H3 and the first branch pipe H4 are connected to the second inlet pipe H6, the inlet of the first drying module 100 is connected to the first inlet pipe H2 and the second reflux pipe H7, and the outlet is connected to the first branch pipe H4 and the first outlet pipe H5; the inlet of the second drying module 200 is connected to the second inlet pipe H6, the outlet is connected to the second reflux pipe H7 and the second outlet pipe H8, and the first outlet pipe H5 and the second outlet pipe H8 are connected to the product hydrogen total outlet pipe H9.

[0086] According to an embodiment of the present invention, the drying method of the above-mentioned hydrogen drying system includes: obtaining the front-end hydrogen production load; when the fluctuation range of the front-end hydrogen production load exceeds a preset range, controlling at least two of the at least two drying modules to switch to a series state or a parallel state; when the fluctuation range of the front-end hydrogen production load is within a preset range, controlling at least one of the at least two drying modules to switch to a hot standby state.

[0087] When the front-end hydrogen production load is in a large fluctuation range, it will cause the hydrogen flow load to fluctuate widely beyond the load range designed for the hydrogen purification system, resulting in insufficient hydrogen drying depth and failure to meet the product hydrogen purity requirements. When the front-end hydrogen production load is in a large fluctuation range, this embodiment provides switching of the series and parallel states of at least two modules according to the fluctuation direction of the front-end hydrogen production load. When at least two drying modules are connected in series, they can share a regeneration gas to reduce the flow required for regeneration, thereby reducing the lower limit of the hydrogen production load, ensuring the regeneration capacity of the equipment, and increasing the purity of the output hydrogen; when at least two drying modules are connected in parallel, the raw hydrogen enters the at least two drying modules at a low flow rate, respectively, reducing the drying load of each drying module, thereby also increasing the purity of the output hydrogen. On the premise that the purity of the product hydrogen remains unchanged, when at least two or more drying modules are connected in series, the regeneration load borne by the entire drying system is reduced exponentially, reducing the lower limit of the load adjustable range; when at least two or more drying modules are connected in parallel, the raw hydrogen enters at least two drying modules at half the flow rate, increasing the upper limit of the load adjustable range of the parallel drying combination system. Through the above method, the load range of hydrogen purification can be significantly widened, meeting the wide fluctuation requirements when the front-end hydrogen production load is in a large fluctuation range, ensuring the drying depth of hydrogen, and improving the hydrogen purification efficiency and hydrogen purity.

[0088] In one embodiment, when the fluctuation range of the front-end hydrogen production load exceeds a preset range, the step of controlling at least two of the at least two drying modules to switch to a series state or a parallel state includes: when the front-end hydrogen production load is insufficient, controlling the pipeline assembly to switch at least two of the at least two drying modules to a series state; when the front-end hydrogen production load is too high, controlling the pipeline assembly to switch at least two of the at least two drying modules to a parallel state.

[0089] In this embodiment, when the hydrogen production load at the front end is insufficient, the control pipeline assembly switches at least two of the at least two drying modules to a series state. When the at least two drying modules are connected in series, they can share a regeneration gas to reduce the flow rate required for regeneration, thereby reducing the lower limit of the hydrogen production load, ensuring the regeneration capacity of the equipment, and increasing the purity of the output hydrogen; when the hydrogen production load at the front end is too high, the control pipeline assembly switches at least two of the at least two drying modules to a parallel state. At this time, the raw hydrogen enters the at least two drying modules at a low flow rate, reducing the drying load of each drying module, thereby also increasing the purity of the output hydrogen.

[0090] In one embodiment, when the fluctuation range of the front-end hydrogen production load is within a preset range, the step of controlling at least one of the at least two drying modules to switch to a hot standby state includes: obtaining the drying efficiency of each drying module in the at least one drying module to be switched to the hot standby state; comparing the drying efficiency of the at least one drying module to be switched to the hot standby state with a preset first drying efficiency threshold; if the drying efficiency of a drying module is lower than the preset first drying efficiency threshold, controlling the drying module to be in a regeneration state until the drying efficiency of the drying module reaches a preset second drying efficiency threshold, wherein the second drying efficiency threshold is greater than the first drying efficiency threshold; if the drying efficiency of the at least one drying module to be switched to the hot standby state is greater than the preset first drying efficiency threshold, controlling at least one drying module to be switched to the hot standby state to switch to the hot standby state.

[0091] In this embodiment, the drying modules to be switched to the hot standby state are first determined, and then the drying efficiencies of these drying modules are detected, and the drying modules whose drying efficiencies are lower than the first drying efficiency threshold are regenerated, so that the drying modules with lower drying efficiencies are regenerated during idle time without affecting the normal operation of other drying modules, and the drying function of the drying modules is restored without taking up additional regeneration time. After the regeneration is completed, the drying modules that have completed the regeneration can enter the hot regeneration mode and can be put into use at any time.

[0092] In one embodiment, when at least one drying module to be switched to hot standby status is switched to hot standby status, the instrument purge valve corresponding to the drying module in hot standby status is controlled to open to a preset opening. When only part of the drying modules are working normally, the other part of the drying modules can be placed in a regeneration state so that they can be started at any time. This method not only shortens the replacement time of the analytical instrument, but also greatly reduces the lower limit of the flow load of the drying module, shortens the regeneration time during operation, and can be better applied to the scenario where the load of the hydrogen production module at the front end of the drying module fluctuates.

[0093] In one embodiment, when the fluctuation range of the front-end hydrogen production load is within a preset range, the step of controlling at least one of the at least two drying modules to switch to a hot standby state also includes: obtaining the drying efficiency of each drying module; comparing the drying efficiency of each drying module with a preset first drying efficiency threshold; when the drying efficiency of at least one drying module is less than the preset first drying efficiency threshold, setting the at least one drying module as a drying module to be switched to a hot standby state, and controlling the at least one drying module to be set in a regeneration state until the drying efficiency of the drying module reaches a preset second drying efficiency threshold, wherein the second drying efficiency threshold is greater than the first drying efficiency threshold; controlling the at least one drying module to be in a hot standby state.

[0094] In this embodiment, the drying efficiency of the drying module is first detected, and the drying module to be switched to the hot standby state is determined based on the drying efficiency, and the drying modules that meet the regeneration requirements among these drying modules are regenerated, and then these drying modules are all put into the hot standby state, thereby making the selection of the hot standby drying modules more reasonable and ensuring that the drying modules can be in a higher working efficiency.

[0095] In one embodiment, the drying method also includes: obtaining the drying efficiency of each drying module; comparing the drying efficiency of each drying module with a preset first drying efficiency threshold; when the drying efficiency of at least one drying module is less than the preset first drying efficiency threshold, controlling the at least one drying module to be in a regeneration state until the drying efficiency of the drying module reaches a preset second drying efficiency threshold; controlling the drying module that reaches the preset second drying efficiency threshold to be in a normal operating state.

[0096] In this embodiment, by detecting the drying efficiency of each drying module, the drying efficiency of each drying module can be obtained, and the drying modules with lower drying efficiency can be regenerated in real time. The drying modules after regeneration continue to be put into use, thereby ensuring the drying efficiency of each drying module and ensuring the hydrogen purification efficiency and purity.

[0097] The structure and operation method of the hydrogen drying system of the embodiment of the present application will be described below by taking the drying modules including the first drying module 100 and the second drying module 200 as an example. The structures and operation methods of more drying modules are similar to this and can be deduced accordingly, so they will not be described separately here.

[0098] See also Figures 2 to 8 As shown, it is a system structure diagram of the working state of the hydrogen drying method in the embodiment of the present application, wherein the thick lines in the figure represent connected pipelines, and the thin lines represent non-connected pipelines.

[0099] In the present embodiment, the hydrogen drying method has seven working states, namely, Z1, Z2, Z3, Z4, Z5, Z6 and Z7. In the Z1 state, the first drying module 100 is connected in series with the second drying module 200; in the Z2 state, the second drying module 200 is connected in series with the first drying module 100; in the Z3 state, the first drying module 100 is connected in parallel with the second drying module 200; in the Z4 state, the second drying module 200 is disconnected and only the first drying module 100 is operated; in the Z5 state, the first drying module 100 is disconnected and only the second drying module 200 is operated.

[0100] In working state Z1-Z3, both drying modules are operating normally. In working state Z4-Z7, one drying module is operating normally, and the other drying module is in hot standby state.

[0101] The Z1 and Z2 states are states where multiple lossless drying modules are connected in series, and are suitable for operating conditions where the input flow is lower than the regeneration flow of a single drying module.

[0102] When used in Z1 and Z2 states, since the drying modules are connected in series, it is necessary to ensure sufficient allowable pressure drop to ensure the normal operation of the hydrogen drying system.

[0103] The Z3 state is a state where multiple lossless drying modules are connected in parallel, which is suitable for the operating condition where the input flow is higher than the regeneration flow of a single drying module.

[0104] In the Z4 and Z5 states, only one drying module is running, and the other is in hot standby state.

[0105] In the Z1 state: the first inlet valve G1, the first flow regulating valve G2, the first diverter valve G4, the first reflux valve G6, the second flow regulating valve G7, and the second outlet valve G8 are open, and the first outlet valve G3, the second inlet valve G5, and the second reflux valve G9 are closed. The raw hydrogen first enters the first drying module 100 for drying, and the output gas is passed into the second drying module 200 for deep drying, forming qualified high-purity product hydrogen without loss.

[0106] In the Z2 state: the first flow regulating valve G2, the first outlet valve G3, the first reflux valve G6, the second inlet valve G5, the second flow regulating valve G7, and the second reflux valve G9 are open, and the first inlet valve G1, the first diverter valve G4, and the second outlet valve G8 are closed. The raw hydrogen first enters the second drying module 200 for drying, and the output gas is passed into the first drying module 100 for deep drying, forming qualified high-purity product hydrogen without loss.

[0107] In the Z3 state: the first inlet valve G1, the first flow regulating valve G2, the first reflux valve G6, the second inlet valve G5, the second flow regulating valve G7, and the second reflux valve G9 are opened, and the first outlet valve G3, the first diverter valve G4, and the second outlet valve G8 are closed. The diverted flow of the raw hydrogen enters the first drying module 100 and the second drying module 200 for drying respectively, and is discharged after being collected at the outlet, forming qualified high-purity product hydrogen without loss.

[0108] In the Z4 state: the first inlet valve G1, the first flow regulating valve G2, the first outlet valve G3, the first diverter valve G4, the first reflux valve G6, and the second reflux valve G9 are open, and the second inlet valve G5, the second flow regulating valve G7, and the second outlet valve G8 are closed. The raw hydrogen first enters the first drying module 100 for drying, and the output gas is passed into the second drying module 200 for regeneration and then flows back to the first drying module 100 for drying, so as to form qualified high-purity product hydrogen without loss.

[0109] In the Z5 state: the first reflux valve G6, the second inlet valve G5, the second flow regulating valve G7, and the second outlet valve G8 are open, and the first inlet valve G1, the first flow regulating valve G2, the first outlet valve G3, the first diverter valve G4, and the second reflux valve G9 are closed. The raw hydrogen first enters the second drying module 200 for drying, and the output gas is passed into the first drying module 100 for regeneration and then flows back to the second drying module 200 for drying, forming qualified high-purity product hydrogen without loss.

[0110] In the Z6 state: the first inlet valve G1, the first flow regulating valve G2, and the first outlet valve G3 are open, the second inlet valve G5, the second flow regulating valve G7, the second outlet valve G8, and the second return valve G9 are closed, and the first diverter valve G4 and the first return valve G6 can adjust the switch state and flow according to the actual working conditions. The raw hydrogen first enters the first drying module 100 for drying, and the output gas is the qualified product gas, and the qualified high-purity product hydrogen is formed without loss.

[0111] In the Z7 state: the first reflux valve G6, the second inlet valve G5, the second flow regulating valve G7, and the second outlet valve G8 are open, and the first inlet valve G1, the first flow regulating valve G2, the first outlet valve G3, the first diverter valve G4, and the first reflux valve G9 are closed. The raw hydrogen first enters the first drying module 100 for drying, and the output gas is the qualified product gas, and the qualified high-purity product hydrogen is formed without loss.

[0112] The first reflux valve G6 or the second inlet valve G5 can be replaced with a regulating valve, and a power system can be added to the first shunt pipe H4 to provide power when the hydrogen production module is short of hydrogen supply. In the Z6 state, the second drying module 200 is put into hot standby state.

[0113] One of the first reflux valve G6 or the second inlet valve G5 can be changed into a regulating valve, and a power system can be added to the first shunt pipe H4 to provide power when the hydrogen production module is short of hydrogen supply. In the Z7 state, the first drying module 100 is put into hot standby state.

[0114] The drying module in hot standby state can be started at any time after regeneration is complete, and can cooperate with the fluctuating working conditions of the front-end hydrogen production system. In addition, the drying module in hot standby state can slightly open the instrument purge valve to ensure that the gas passing through the instrument is always in a flow state to be tested, and no purge is required at the next startup, and it can be put into use directly.

[0115] like Figure 2As shown, this state is suitable for the working condition where the front-end hydrogen production load is insufficient. In this state, the raw hydrogen first enters the first drying module 100, and then enters the second drying module 200, and the purity of hydrogen is increased by connecting the two drying modules in series. The raw hydrogen produced by the first hydrogen production module P1 and the second hydrogen production module P2 respectively enter the raw hydrogen total inlet pipe H1 after converging through the first hydrogen production pipeline H00 and the second hydrogen production pipeline H10; the raw gas enters the system through the total inlet pipe H1, and then directly enters the first drying module 100 through the first inlet pipe H2, and a complete drying process is carried out in the first drying module 100; the hydrogen outlet of the first drying module 100 is connected to the first shunt pipe H4, and the gas enters the second inlet pipe H6 through the valve switching, and then enters the second drying module 200, and a complete drying process is carried out in the second drying module 200. By analogy, the raw hydrogen flows out after passing through the complete working process of two or more drying modules, and the product hydrogen is output through the second outlet pipe H8 and the product hydrogen total outlet pipe H9.

[0116] like Figure 3 As shown, this state is also applicable to the working condition where the front-end hydrogen production load is insufficient. In this state, the raw hydrogen first enters the second drying module 200, and then enters the first drying module 100, and the purity of hydrogen is increased by connecting two drying modules in series. The raw hydrogen produced by the first hydrogen production module P1 and the second hydrogen production module P2 respectively enter the raw hydrogen total inlet pipe H1 after converging through the first hydrogen production pipeline H00 and the second hydrogen production pipeline H10; the raw gas enters the system through the total inlet pipe H1, and then directly enters the first reflux pipe H3, and the gas enters the second inlet pipe H6 through the valve switching, and then enters the second drying module 200, and a complete drying process is carried out in the second drying module 200; the hydrogen outlet of the second drying module 200 is connected to the second reflux pipe H7, so that the gas enters the first drying module 100, and a complete drying process is carried out in the first drying module 100. By analogy, the raw hydrogen flows out after passing through the complete work process of two or more drying modules, and the product hydrogen is output through the first outlet pipe H5 and the product hydrogen total outlet pipe H9.

[0117] like Figure 4As shown, this state is suitable for the working condition where the front-end hydrogen production load is too high. In this state, the raw hydrogen enters the first drying module 100 and the second drying module 200 at the same time, and the purity of hydrogen is increased by connecting the two drying modules in parallel. The raw hydrogen produced by the first hydrogen production module P1 or the second hydrogen production module P2 enters the raw hydrogen total inlet pipe H1 through the first hydrogen production pipeline H00 or the second hydrogen production pipeline H10; the raw gas enters the system through the total inlet pipe H1, and then the split flow passes through the first inlet pipe H2 and the first reflux pipe H3. Among them, one channel of hydrogen entering the first inlet pipe H2 directly enters the first drying module 100, and a complete drying process is carried out in the first drying module 100; one channel of hydrogen entering the first reflux pipe H3 enters the second inlet pipe H6, and then enters the second drying module 200, and a complete drying process is carried out in the second drying module 200. By analogy, the fractional flow of raw hydrogen flows out after passing through the complete working process of two or more drying modules at the same time, and is merged into the product hydrogen main outlet pipe H9 through the first outlet pipe H5 and the second outlet pipe H8 to output the product hydrogen.

[0118] like Figure 5 As shown, this state is suitable for working conditions where the cost of front-end hydrogen production is too high. In this state, the raw hydrogen first enters the first drying module 100 for work, and then enters the second drying module 200 for regeneration, and the regenerated gas returns to the first drying module 100 for re-drying. The raw hydrogen produced by the first hydrogen production module P1 or the second hydrogen production module P2 enters the raw hydrogen total inlet pipe H1 through the first hydrogen production pipeline H00 or the second hydrogen production pipeline H10 respectively; the raw gas enters the system through the total inlet pipe H1, and then directly enters the first drying module 100 through the first inlet pipe H2, and a complete drying process is carried out in the first drying module 100, and the hydrogen outlet of the first drying module 100 is respectively connected to the first outlet pipe H5 and the first reflux pipe H4. Part of the gas connected to the first outlet pipe H5 directly outputs the product hydrogen through the product hydrogen main outlet pipe H9; while the hydrogen connected to the first reflux pipe H4 is switched by a valve so that the gas enters the second inlet pipe H6, and then enters the second drying module 200, and after the regeneration process in the second drying module 200, it flows back to the first drying module 100 through the first reflux pipe H7 for re-drying. Similarly, the raw hydrogen flows out after passing through the complete workflow of two or more drying modules, and outputs the product hydrogen through the first outlet pipe H5 and the product hydrogen main outlet pipe H9.

[0119] like Figure 6As shown, this state is also applicable to the working condition where the cost of front-end hydrogen production is too high. In this state, the raw hydrogen first enters the second drying module 200 for work, and then enters the first drying module 100 for regeneration, and the regenerated gas returns to the second drying module 200 for re-drying. The raw hydrogen produced by the first hydrogen production module P1 or the second hydrogen production module P2 enters the raw hydrogen total inlet pipe H1 through the first hydrogen production pipeline H00 or the second hydrogen production pipeline H10 respectively; the raw gas enters the system through the total inlet pipe H1, and then directly passes through the first reflux pipe H3, and the gas enters the second inlet pipe H6 through the valve switching, and then enters the second drying module 200, and the complete drying process is carried out in the second drying module 200. The hydrogen outlet of the second drying module 200 is connected to the second outlet pipe H8 and the second reflux pipe H7 respectively. Part of the gas connected to the second outlet pipe H8 directly outputs the product hydrogen through the product hydrogen total outlet pipe H9; and the hydrogen connected to the second reflux pipe H7 is switched by the valve so that the gas enters the first drying module 100, and the regeneration process is carried out in the first drying module 100. By analogy, the raw hydrogen flows out after passing through the complete work process of two or more drying modules, and the product hydrogen is output through the second outlet pipe H8 and the product hydrogen main outlet pipe H9.

[0120] like Figure 7 As shown, this state is applicable to the case where the front-end hydrogen production condition is stable and normal. In this state, the raw hydrogen directly enters the first drying module 100 to work, and the obtained high-purity hydrogen is directly discharged. The raw hydrogen produced by the first hydrogen production module P1 or the second hydrogen production module P2 enters the raw hydrogen main inlet pipe H1 through the first hydrogen production pipeline H00 or the second hydrogen production pipeline H10 respectively; the raw gas enters the system through the main inlet pipe H1, and then directly enters the first drying module 100 through the first inlet pipe H2, and a complete drying process is carried out in the first drying module 100. The hydrogen outlet of the first drying module 100 is connected to the first outlet pipe H5, and the product hydrogen is output through the first outlet pipe H5 and the product hydrogen main outlet pipe H9.

[0121] like Figure 8 As shown, this state is applicable to the case where the front-end hydrogen production condition is stable and normal. In this state, the raw hydrogen directly enters the second drying module 200 to work, and the obtained high-purity hydrogen is directly discharged. The raw hydrogen produced by the first hydrogen production module P1 or the second hydrogen production module P2 enters the raw hydrogen main inlet pipe H1 through the first hydrogen production pipeline H00 or the second hydrogen production pipeline H10 respectively; the raw gas enters the system through the main inlet pipe H1, and then directly enters the second drying module 200 through the first reflux pipe H3, and a complete drying process is carried out in the second drying module 200. The hydrogen outlet of the second drying module 200 is connected to the second outlet pipe H8, and the product hydrogen is output through the second outlet pipe H8 and the product hydrogen main outlet pipe H9.

[0122] Example 1

[0123] like Fig. 9 As shown, the rated flow rate of each hydrogen production module is Q, and a total of X hydrogen production modules correspond to X drying modules. The rated flow rate of each drying module is still Q, and its minimum regeneration flow rate is set to x%Q. Under normal operating conditions, one hydrogen production module corresponds to one drying module, with a rated flow rate of Q and a minimum regeneration flow rate of x%Q; when two hydrogen production modules exist, the two drying modules are connected in series, with a rated flow rate of 2Q and a minimum regeneration flow rate of (x / 2)%(2Q); when three hydrogen production modules exist, the three drying modules are connected in series, with a rated flow rate of 3Q and a minimum regeneration flow rate of (x / 3)%(3Q); ... and so on, when N hydrogen production modules exist, N drying modules are connected in series, with a rated flow rate of NQ and a minimum regeneration flow rate of (x / N)%(NQ). On the premise of ensuring that the pressure drop can meet the export requirements, the proportion of the regeneration flow required by the drying module to the total rated flow rate can be infinitely reduced, thereby reducing the adjustable lower limit of its front-end hydrogen production load.

[0124] Example 2

[0125] like Fig.10 As shown, the rated flow rate of each hydrogen production module is Q, and there is a total of 1 hydrogen production module. When 1 drying module is used for 1 hydrogen production system, its flow input is Q, and the maximum flow rate of each drying module can be set to Q; when 2 drying modules are used for 1 hydrogen production system, its flow input is Q, and the maximum flow rate of each drying module can be set to Q / 2; when 3 drying modules are used for 1 hydrogen production system, its flow input is Q, and the maximum flow rate of each drying module can be set to Q / 3... and so on, when N drying modules are used for 1 hydrogen production system, its flow input is Q, and the maximum flow rate of each drying module can be set to Q / N. In short, under the premise of cost permission, the purification system can infinitely reduce the maximum flow rate entering each drying module, reducing the load borne by each drying module.

[0126] Example 3

[0127] like Fig. 9As shown, there are x drying modules in total, and the maximum flow load of each drying module is Q. When the hydrogen production flow at the front end of the drying module is less than Q, at least one drying module needs to be in working state, and at most x-1 drying modules need to be in hot standby state; when the hydrogen production flow at the front end of the drying module is greater than Q and less than 2Q, at least two drying modules need to be in working state, and at most x-2 drying modules need to be in hot standby state; when the hydrogen production flow at the front end of the drying module is greater than 2Q and less than 3Q, at least three drying modules need to be in working state, and at most x-3 drying modules need to be in hot standby state; ... and so on, when the hydrogen production flow at the front end of the drying module is greater than (x-2)Q and less than (x-1)Q, at least x-1 drying modules need to be in working state, and at most 1 drying module needs to be in hot standby state; when the hydrogen production flow at the front end of the drying module is greater than (x-1)Q and less than xQ, all drying modules need to work normally. Under the premise of ensuring that the pressure drop can meet the export requirements and that the hydrogen production flow rate at the front end of the drying module is less than or equal to the sum of the maximum flow loads of all drying modules, multiple drying modules can be connected in series indefinitely to ensure that the rear end drying module enters the hot standby state. The drying module entering the hot standby state can ensure that the analytical instrument can be started at any time after the regeneration is complete to meet the load fluctuation problem of the front end hydrogen production module.

[0128] Example 4

[0129] like Fig. 9 As shown, when one of the drying modules is in hot standby state, the hydrogen supplied from the front end can be used to regenerate the drying modules respectively. This method can stop the drying module at any time in the working state, and continue to regenerate after switching to hot standby state, and can also ensure that the module can be started at any time after regeneration is completed. In addition, the instrument analysis gas valve inside the drying module can be slightly opened to ensure that the gas passing through the instrument is always in a flow state to be detected, and it can be directly put into use without purging at the next startup.

[0130] The technical solution of the embodiment of the present application has the following advantages:

[0131] When at least two drying modules are connected in series, they can share one regeneration gas, reducing the flow rate required for regeneration, thereby reducing the lower limit of hydrogen production load, ensuring the regeneration capacity of the equipment, and increasing the purity of the output hydrogen; when two drying modules are connected in parallel, the raw hydrogen enters the two drying modules at a low flow rate, reducing the drying load of each drying module, thereby increasing the purity of the output hydrogen. On the premise that the purity of the product hydrogen remains unchanged, when two or more drying modules are connected in series, the regeneration load borne by the entire lossless drying combination system is reduced exponentially, reducing the lower limit of the load adjustable range; when two or more drying modules are connected in parallel, the raw hydrogen enters the two drying modules at half the flow rate, increasing the upper limit of the load adjustable range of the parallel drying combination system.

[0132] In addition, the present invention has a hot standby function: when only one drying module is working normally, the other drying module can be put into a regeneration state so that it can be started at any time. This method not only shortens the replacement time of the analytical instrument, but also greatly reduces the flow load lower limit of the drying module, shortens the regeneration time during operation, and can be better applied to the scenario where the load of the hydrogen production module at the front end of the drying module fluctuates.

[0133] Adding a power system to the diversion pipeline can provide power when the hydrogen supply to the hydrogen production module is insufficient, ensuring stable and reliable operation of the system.

[0134] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0135] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0136] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hydrogen drying system, characterized in that: include: At least two drying modules, used for drying the raw hydrogen; A raw hydrogen main inlet pipe (H1) for providing raw hydrogen to the at least two drying modules; A product hydrogen main outlet pipe (H9), used for outputting the product hydrogen after being processed by the at least two drying modules; as well as The pipeline assembly includes a hydrogen pipeline and a valve arranged on the hydrogen pipeline, which is used to control the flow direction and flow rate of the raw hydrogen to achieve the switching of the series connection, parallel connection or hot standby state between the at least two drying modules.

2. The hydrogen drying system according to claim 1, characterized in that: The at least two drying modules include a first drying module (100) and a second drying module (200), The hydrogen pipeline comprises: A first inlet pipe (H2), a first end of which is connected to the raw hydrogen main inlet pipe (H1), and a second end of which is connected to the inlet of the first drying module (100); A first branch pipe (H4), a first end of which is connected to an outlet of the first drying module (100); A first reflux pipe (H3), a first end of which is connected to the connection point between the raw hydrogen main inlet pipe (H1) and the first inlet pipe (H2), and a second end of which is connected to the second end of the first branch pipe (H4); A second inlet pipe (H6), a first end of which is connected to the connection between the first return pipe (H3) and the first branch pipe (H4), and a second end of which is connected to the inlet of the second drying module (200); A second reflux pipe (H7), a first end of which is connected to the outlet of the second drying module (200), and a second end of which is connected to the inlet of the first drying module (100); A first outlet pipe (H5), a first end of which is connected to the outlet of the first drying module (100), and a second end of which is connected to the product hydrogen main outlet pipe (H9); A second outlet pipe (H8) has a first end connected to the outlet of the second drying module (200) and a second end connected to the product hydrogen main outlet pipe (H9).

3. The hydrogen drying system according to claim 2, characterized in that: The valve comprises: a first inlet valve (G1), arranged on the first inlet pipe (H2); a first outlet valve (G3), arranged on the first outlet pipe (H5); a first flow dividing valve (G4), arranged on the first flow dividing pipe (H4); a second inlet valve (G5), arranged on the second inlet pipe (H6); a first reflux valve (G6), arranged on the first reflux pipe (H3); a second outlet valve (G8), arranged on the second outlet pipe (H8); The second reflux valve (G9) is arranged on the second reflux pipe (H7).

4. The hydrogen drying system according to claim 1, characterized in that: The at least two drying modules include a first drying module (100) and a second drying module (200); the first drying module (100) includes a first flow detection pipeline (101) and a first inlet pipeline (102); a first flow meter (103) is arranged on the first flow detection pipeline (101); and a first flow regulating valve (G2) is arranged on the first inlet pipeline (102); the second drying module (200) includes a second flow detection pipeline (201) and a second inlet pipeline (202); a second flow meter (203) is arranged on the second flow detection pipeline (201); and a second flow regulating valve (G7) is arranged on the second inlet pipeline (202).

5. The hydrogen drying system according to claim 1, characterized in that: The drying module comprises a dryer, a heater and a cooler; and / or, the performance of each drying module is the same.

6. The hydrogen drying system according to claim 2, characterized in that: The first shunt pipe (H4) is provided with a power system, and the first return valve (G6) or the second inlet valve (G5) is a flow regulating valve.

7. The hydrogen drying system according to claim 1, characterized in that: The hydrogen drying system further comprises an instrument purge valve, and the instrument purge valve corresponding to the drying module in hot standby state is opened to a preset opening.

8. A drying method for a hydrogen drying system according to any one of claims 1 to 7, characterized in that: include: Obtain the front-end hydrogen production load; When the fluctuation range of the front-end hydrogen production load exceeds a preset range, at least two of the at least two drying modules are controlled to switch to a series state or a parallel state; When the fluctuation range of the front-end hydrogen production load is within a preset range, at least one of the at least two drying modules is controlled to switch to a hot standby state.

9. The drying method of the hydrogen drying system according to claim 8, characterized in that: When the fluctuation range of the front-end hydrogen production load exceeds a preset range, the step of controlling at least two of the at least two drying modules to switch to a series state or a parallel state includes: When the front-end hydrogen production load is insufficient, the control pipeline assembly switches at least two of the at least two drying modules to a series state; When the front-end hydrogen production load is too high, the control pipeline assembly switches at least two of the at least two drying modules to a parallel state.

10. The drying method of the hydrogen drying system according to claim 8, characterized in that: When the fluctuation range of the front-end hydrogen production load is within a preset range, the step of controlling at least one of the at least two drying modules to switch to a hot standby state comprises: Acquiring the drying efficiency of each drying module in at least one drying module to be switched to a hot standby state; comparing the drying efficiency of at least one drying module to be switched to the hot standby state with a preset first drying efficiency threshold; If the drying efficiency of a drying module is lower than a preset first drying efficiency threshold, the drying module is controlled to be in a regeneration state until the drying efficiency of the drying module reaches a preset second drying efficiency threshold, wherein the second drying efficiency threshold is greater than the first drying efficiency threshold; If the drying efficiency of at least one drying module to be switched to the hot standby state is greater than a preset first drying efficiency threshold, the at least one drying module to be switched to the hot standby state is controlled to switch to the hot standby state.

11. The drying method according to claim 8, characterized in that: When at least one drying module to be switched to the hot standby state is switched to the hot standby state, the instrument purge valve corresponding to the drying module in the hot standby state is controlled to open to a preset opening.

12. The drying method according to claim 8, characterized in that: When the fluctuation range of the front-end hydrogen production load is within a preset range, the step of controlling at least one of the at least two drying modules to switch to a hot standby state further includes: Obtain the drying efficiency of each drying module; Comparing the drying efficiency of each drying module with a preset first drying efficiency threshold; When the drying efficiency of at least one drying module is less than a preset first drying efficiency threshold, the at least one drying module is set as a drying module to be switched to a hot standby state, and the at least one drying module is controlled to be set in a regeneration state until the drying efficiency of the drying module reaches a preset second drying efficiency threshold, wherein the second drying efficiency threshold is greater than the first drying efficiency threshold; The at least one drying module is controlled to be in a hot standby state.

13. The drying method according to claim 8, characterized in that: Drying methods also include: Obtain the drying efficiency of each drying module; Comparing the drying efficiency of each drying module with a preset first drying efficiency threshold; When the drying efficiency of at least one drying module is less than a preset first drying efficiency threshold, controlling the at least one drying module to be set in a regeneration state until the drying efficiency of the drying module reaches a preset second drying efficiency threshold; The drying module that has reached the preset second drying efficiency threshold is controlled to be in a normal operating state.

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