Hydrogen purifying and drying system and hydrogen production system

Abstract

The utility model discloses a hydrogen purifying and drying system and a hydrogen production system. The hydrogen purifying and drying system comprises at least two drying towers, the two drying towers are the first drying tower and the second drying tower, and the first drying tower and the second drying tower sequentially serve as a main working drying tower and a regeneration drying tower in turn in each operation stage of periodic operation; the main working drying tower is used for leading out a first part of hydrogen in purified hydrogen obtained by the main working drying tower through a product gas leading-out pipeline, leading a second part of hydrogen in the purified hydrogen into the regeneration drying tower through a regeneration gas leading-in pipeline, and leading out regenerated hydrogen obtained by the regeneration drying tower through the regeneration gas leading-out pipeline; a regeneration regulating valve, a flow detector and at least one pressure detector are arranged on one of the regeneration gas leading-in pipeline, the regeneration gas leading-out pipeline and the product gas leading-out pipeline, and the regeneration regulating valve is electrically connected with the flow detector and the at least one pressure detector respectively. The hydrogen purifying and drying system can realize low-load stable operation.

Description

Technical Field

[0001] The utility model belongs to the technical field of water electrolysis hydrogen production, and specifically relates to a hydrogen purification and drying system and a hydrogen production system. Background Art

[0002] Green electricity hydrogen production is a new technology that uses solar energy to produce hydrogen. Its principle is to convert solar energy into electrical energy, use electrolysis to decompose water into hydrogen and oxygen, thereby obtaining hydrogen, and separate and purify the hydrogen to finally obtain high-purity hydrogen. Green electricity hydrogen production uses photovoltaic power generation during the day and can only use grid electricity at night. Since the price of grid electricity is much higher than the price of green electricity, in general, the load of green electricity hydrogen production varies greatly during the day and night. The existing hydrogen purification and drying system cannot meet the low operating load requirements at night, affecting the quality of the purified product gas. Therefore, a reliable and effective hydrogen purification and drying system is needed to solve the technical problems of purification under ultra-low load conditions. Utility Model Content

[0003] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a hydrogen purification and drying system and a hydrogen production system.

[0004] In a first aspect of the utility model, a hydrogen purification drying system is provided, comprising: at least two drying towers, wherein the two drying towers are a first drying tower and a second drying tower, the hydrogen purification drying system is configured to operate periodically, and the hydrogen purification drying system includes a first operating stage and a second operating stage in each operating cycle, and the first drying tower and the second drying tower are used as a main working drying tower and a regeneration drying tower in turn in each operating stage;

[0005] The main working drying tower is configured to perform adsorption treatment on the crude hydrogen prepared by the hydrogen production system to obtain purified hydrogen;

[0006] A product gas outlet pipeline, used for exporting the first part of the hydrogen in the purified hydrogen from the main working drying tower;

[0007] a regeneration gas introduction pipeline for introducing the second part of the hydrogen in the purified hydrogen into the regeneration drying tower; the regeneration drying tower is configured to regenerate the adsorption material of the regeneration drying tower using the second part of the hydrogen in the purified hydrogen to obtain regenerated hydrogen;

[0008] A regeneration gas outlet pipeline, used for exporting the regeneration hydrogen from the regeneration drying tower;

[0009] At least one pressure detector is arranged on the product gas outlet pipeline and / or the regeneration gas outlet pipeline;

[0010] A regeneration regulating valve and a flow detector are respectively arranged on one of the regeneration gas inlet pipeline, the regeneration gas outlet pipeline and the product gas outlet pipeline, the regeneration regulating valve and the flow detector are electrically connected, and the regeneration regulating valve is electrically connected to the at least one pressure detector.

[0011] The hydrogen purification and drying system provided by the utility model can change the control mode of purification pressure and flow rate according to the change of its operation load, so as to realize the low-load stable operation of the hydrogen purification and drying system.

[0012] In addition, a hydrogen purification and drying system of the utility model may also have the following additional technical features:

[0013] Preferably, the regeneration regulating valve is arranged on the regeneration gas inlet pipeline and / or the regeneration gas outlet pipeline, and the flow detector is arranged on the regeneration gas inlet pipeline and / or the regeneration gas outlet pipeline.

[0014] Preferably, the regeneration regulating valve is arranged on the regeneration gas inlet pipeline and / or the regeneration gas outlet pipeline, and the flow detector is arranged on the product gas outlet pipeline.

[0015] Preferably, a product regulating valve is provided on the product gas outlet pipeline, and the pressure detector is electrically connected to the product regulating valve.

[0016] Preferably, the flow detector is electrically connected to the product regulating valve.

[0017] Preferably, the regeneration regulating valve is arranged on the regeneration gas inlet pipeline and / or the regeneration gas outlet pipeline, the flow detector is arranged on the regeneration gas inlet pipeline and / or the regeneration gas outlet pipeline; the pressure detector is arranged on the product gas outlet pipeline.

[0018] Preferably, the hydrogen purification drying system also includes a third drying tower, and the hydrogen purification drying system includes a first operation stage, a second operation stage and a third operation stage in each operation cycle; wherein the third drying tower is an auxiliary working drying tower, and the first drying tower, the second drying tower and the third drying tower respectively serve as a main working drying tower, an auxiliary working drying tower and a regeneration drying tower in each operation stage; the auxiliary working drying tower is configured to perform adsorption treatment on the regenerated hydrogen obtained by the regeneration drying tower to obtain dry regenerated hydrogen.

[0019] Preferably, the regeneration gas outlet pipeline includes a regeneration gas outlet branch for conducting the dry regeneration hydrogen from the auxiliary working drying tower.

[0020] Preferably, the regeneration regulating valve and the flow detector are arranged on the regeneration gas outlet branch.

[0021] Preferably, the pressure detector is arranged on the regeneration gas outlet branch.

[0022] Preferably, the regeneration regulating valve and the flow detector are both arranged on the regeneration gas outlet branch, the pressure detector is arranged on the product gas outlet pipeline, and the regeneration regulating valve is electrically connected to the flow detector and the pressure detector respectively.

[0023] Preferably, a shut-off valve is provided on the regeneration gas outlet pipeline and / or the product gas outlet pipeline.

[0024] Preferably, the regeneration regulating valve is a ball valve; and the cut-off valve is a stop valve.

[0025] A second aspect of the present invention provides a hydrogen production system, comprising the hydrogen purification and drying system described in any embodiment of the present application.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0028] Figure 1 A working state diagram of the hydrogen purification and drying system provided in an embodiment of the present application in the first operating stage;

[0029] Figure 2 A working state diagram of the hydrogen purification and drying system in the second operation stage provided in an embodiment of the present application;

[0030] Figure 3 A working state diagram of the hydrogen purification and drying system provided in an embodiment of the present application in the third operating stage;

[0031] Figure 4 Another exemplary structural diagram of the regeneration regulating valve pressure regulation control provided in the embodiment of the present application;

[0032] Figure 5 This is a control logic diagram of the hydrogen purification and drying system provided in an embodiment of the present application.

[0033] In the above figure: 10 is a first drying tower; 11 is a second drying tower; 12 is a third drying tower;

[0034] 20 product regulating valve; 21 main line hydrogen filter; 22 pressure detector; 23 cut-off valve;

[0035] 30 regeneration regulating valve; 31 regeneration hydrogen filter; 32 flow detector;

[0036] 40 Product main pipeline; 50 Hydrogen storage tank; 60 Gas cooler; 70 Gas-water separator;

[0037] 80 the first valve; 81 the second valve; 82 the third valve; 83 the fourth valve; 84 the fifth valve; 85 the sixth valve; 86 the seventh valve; 87 the eighth valve; 88 the ninth valve; 89 the tenth valve; 90 the eleventh valve; 91 the twelfth valve; 92 the thirteenth valve; 93 the fourteenth valve; 94 the fifteenth valve; 95 the sixteenth valve. DETAILED DESCRIPTION

[0038] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It is also necessary to explain that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings.

[0039] 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 application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0040] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in this article refers to and includes any or all possible combinations of one or more associated listed items.

[0041] Unless the context requires otherwise, throughout the specification and claims, the term "comprising" is to be construed in an open, inclusive sense, ie, meaning "including, but not limited to."

[0042] In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" are intended to indicate that a specific feature, structure, material or characteristic associated with the embodiment or example is included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0043] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0044] Green electricity hydrogen production is an emerging method of hydrogen energy production, also known as photovoltaic hydrogen production. It is a technology that uses solar energy to produce hydrogen. Its principle is to convert solar energy into electrical energy, use electrolysis reaction to decompose water into hydrogen and oxygen, thereby obtaining hydrogen, and then separate and purify the hydrogen to finally obtain high-purity hydrogen. Photovoltaic hydrogen production closely combines the two clean energy sources of solar energy and hydrogen energy, using green electricity produced by solar energy to electrolyze water to produce hydrogen, and through green electricity hydrogen production to solve the power balance and consumption problems existing in the high proportion of renewable energy grid connection.

[0045] However, due to the large load fluctuations between day and night in photovoltaic power generation, photovoltaic power generation is used during the day, and only grid power can be used at night. Generally speaking, the hydrogen production system can basically operate at full load during the day. The current hydrogen production system can meet the stable operation at a load of 20% to 110%, but cannot meet the demand for lower operating loads at night (such as loads below 20%). In addition, only grid power can be used to replace photovoltaic power generation at night. However, the price of grid power is much higher than the price of green electricity. In order to reduce the cost of hydrogen production, it is necessary to further improve the hydrogen production system to adapt to stable hydrogen production at a lower load.

[0046] As an important subsystem in the hydrogen production system, the hydrogen purification and drying system usually has a product regulating valve in the product gas outlet pipeline to adjust the pressure of the purification and drying system. When the purification load is less than 20%, in order to meet the demand for regenerated hydrogen, all hydrogen is used for regeneration of the regeneration drying tower. At this time, the product regulating valve cannot adjust the pressure of the purification and drying system. The pressure of the hydrogen purification and drying system can only be consistent with the pressure of the hydrogen storage tank. Due to the reduction of gas production at night, the pressure of the hydrogen storage tank will gradually decrease, which is not conducive to hydrogen purification and affects the quality of the purified product gas. Therefore, a reliable and effective hydrogen purification and drying system is needed to solve the technical problems under ultra-low purification load conditions.

[0047] To solve the above technical problems, refer to Figure 1 According to a first aspect of an embodiment of the present application, a hydrogen purification drying system is provided, comprising: at least two drying towers, wherein the two drying towers are a first drying tower 10 and a second drying tower 11, the hydrogen purification drying system is configured to operate periodically, and the hydrogen purification drying system includes a first operating stage and a second operating stage in each operating cycle, and the first drying tower 10 and the second drying tower 11 are used as a main working drying tower and a regeneration drying tower in turn in each operating stage;

[0048] The main working drying tower is configured to perform adsorption treatment on the crude hydrogen prepared by the hydrogen production system to obtain purified hydrogen;

[0049] A product gas outlet pipeline, used for exporting the first part of the hydrogen in the purified hydrogen from the main working drying tower;

[0050] a regeneration gas introduction pipeline for introducing the second part of the hydrogen in the purified hydrogen into the regeneration drying tower; the regeneration drying tower is configured to regenerate the adsorption material of the regeneration drying tower using the second part of the hydrogen in the purified hydrogen to obtain regenerated hydrogen;

[0051] A regeneration gas outlet pipeline, used for exporting the regeneration hydrogen from the regeneration drying tower;

[0052] At least one pressure detector 22 is arranged on the product gas outlet pipeline and / or the regeneration gas outlet pipeline;

[0053] A regeneration regulating valve 30 and a flow detector 32 are respectively arranged on one of the regeneration gas inlet pipeline, the regeneration gas outlet pipeline and the product gas outlet pipeline. The regeneration regulating valve 30 and the flow detector 32 are electrically connected, and the regeneration regulating valve 30 is electrically connected to the at least one pressure detector 22.

[0054] Specifically, the hydrogen purification drying system includes at least two drying towers, wherein the two drying towers are a first drying tower 10 and a second drying tower 11, and the two drying towers are conventional drying towers in the art, and their structures are the same. The crude hydrogen obtained by the hydrogen production system enters the hydrogen purification drying system for processing, and the hydrogen purification drying system is configured to operate periodically, and each operation cycle is divided into a first operation stage and a second operation stage, and the first drying tower 10 and the second drying tower 11 are used as the main working drying tower and the regeneration drying tower in turn in the first operation stage and the second operation stage. For example, in the first operation stage, the first drying tower 10 is the main working drying tower, and the second drying tower 11 is the regeneration drying tower; in the second operation stage, the second drying tower 11 is the main working drying tower, and the first drying tower 10 is the regeneration drying tower.

[0055] The molecular sieve in the main working drying tower adsorbs the crude hydrogen prepared by the hydrogen production system to obtain purified hydrogen, and the purified hydrogen is divided into a first part of hydrogen and a second part of hydrogen, wherein the first part of hydrogen accounts for about 80% of the total mass of the purified hydrogen. The main working drying tower is connected with a product gas outlet pipeline for leading out the first part of hydrogen in the main working drying tower and leading it to the hydrogen storage tank 50; the product gas outlet pipeline is connected with a regeneration gas inlet pipeline for leading out the second part of hydrogen in the main working drying tower and leading it to the regeneration drying tower.

[0056] The regeneration drying tower uses the second part of hydrogen to regenerate the adsorbent material inside itself, thereby obtaining regenerated hydrogen and regenerated adsorbent material. The regeneration drying tower is connected to a regeneration gas outlet pipeline, through which the regeneration hydrogen is led out of the regeneration drying tower and introduced into the hydrogen exhaust device or the hydrogen storage tank 50.

[0057] It should be noted that the regeneration lead-out pipeline refers to the pipeline between the regeneration drying tower and the hydrogen emptying equipment or the hydrogen storage tank 50. The regeneration lead-out pipeline can directly lead the regenerated hydrogen in the regeneration drying tower to the hydrogen emptying equipment, and discharge the regenerated hydrogen into a suitable space such as the atmosphere; or in the process of leading the regeneration hydrogen in the regeneration drying tower through the regeneration lead-out pipeline, the regenerated hydrogen can be dried by processing equipment such as the third drying tower 12, and then the dried hydrogen can be led to the hydrogen emptying equipment or the hydrogen storage tank 50 through the regeneration lead-out pipeline.

[0058] It can be understood that the first part of the hydrogen in the product outlet pipeline and the regenerated hydrogen in the regeneration gas outlet pipeline are both introduced into the hydrogen exhaust device or the hydrogen storage tank 50. Therefore, the product outlet pipeline and the regeneration gas outlet pipeline are merged together and connected to the product main pipeline 40. The product main pipeline 40 is connected to the hydrogen exhaust device or the hydrogen storage tank 50. The first part of the hydrogen and the regenerated hydrogen are both introduced into the same hydrogen exhaust device or the hydrogen storage tank 50 through the product main pipeline 40.

[0059] The hydrogen purification and drying system provided in the embodiment of the present application can determine the regulation and control mode of the regeneration regulating valve 30 according to the operating load of the hydrogen purification and drying system, wherein the operating load of the hydrogen purification and drying system can be monitored and calculated according to the PLC controller or the DCS control system, and the operating load of the hydrogen purification and drying system is the ratio of the gas transmission volume at the front end of the hydrogen purification and drying system to the processing volume of the hydrogen purification and drying system. The gas transmission volume at the front end of the hydrogen purification and drying system can be automatically calculated by the current method, and the calculation formula is as follows:

[0060] Q=Inη / 2390

[0061] Where Q represents the hydrogen production in cubic meters per hour (m 3 / h); I is the current passing through the electrolytic cell, in ampere (A); n is the number of electrolytic cell chambers; η is the current efficiency, in %.

[0062] A regeneration regulating valve 30 and a flow detector 32 are respectively arranged on one of the regeneration gas inlet pipeline, the regeneration gas outlet pipeline and the product gas outlet pipeline. The flow detector 32 can obtain the gas flow information on the corresponding pipeline, such as the flow detectors 32 on the regeneration gas inlet pipeline and the regeneration gas outlet pipeline can obtain the flow of the regeneration hydrogen in real time; for another example, the flow detector 32 on the product outlet pipeline can obtain the flow of the product hydrogen in real time. The regeneration regulating valve 30 and the flow detector 32 are electrically connected. According to the gas flow information obtained in real time by the flow detector 32, the opening of the regeneration regulating valve 30 is adjusted so that the flow of the regeneration hydrogen obtained in real time reaches the rated value of the regeneration hydrogen flow, which generally accounts for 10-20% of the total flow of the product hydrogen in the total product pipeline 40.

[0063] At least one pressure detector 22 is provided on the product gas outlet pipeline and / or the regeneration gas outlet pipeline, and the regeneration regulating valve 30 is electrically connected to the at least one pressure detector 22. The pressure detector 22 provided on the regeneration gas outlet pipeline and / or the product gas outlet pipeline can obtain the pressure value of the hydrogen purification and drying system in real time, and determine the opening of the regeneration regulating valve 30 according to the pressure rating value of the hydrogen purification and drying system and the pressure value of the hydrogen purification and drying system obtained in real time, so that the pressure value of the hydrogen purification and drying system obtained in real time reaches the pressure rating value of the hydrogen purification and drying system.

[0064] like Figure 5 As shown, when the operating load of the hydrogen purification and drying system is greater than the load threshold, the load threshold is generally set to 10%-20%, preferably 20%, the regeneration regulating valve 30 determines the opening of the regeneration regulating valve 30 based on the rated value of the regeneration hydrogen flow rate, and adjusts the opening of the regeneration regulating valve 30 to make the actual flow rate F of the regeneration hydrogen E1 Reach the regeneration hydrogen flow rate F E , so that the flow rate of regenerated hydrogen in the hydrogen purification drying system is maintained at F E The regeneration gas outlet pipeline and the regeneration gas inlet pipeline have the same flow rate of regeneration hydrogen. The rated value of the regeneration hydrogen flow rate is F E Generally, it accounts for 10%-20% of the total product pipeline 40 hydrogen flow rate, and the corresponding product gas outlet pipeline flow rating accounts for 90%-80% of the total product pipeline 40 hydrogen flow rate. The sum of the regenerated hydrogen flow rating and the product hydrogen flow rating on the product gas outlet pipeline is 100%.

[0065] like Figure 5As shown in FIG. 1 , when the operating load of the hydrogen purification and drying system is less than or equal to a load threshold value such as 20%, the regeneration regulating valve 30 determines the opening of the regeneration regulating valve 30 based on the pressure rating of the hydrogen purification and drying system, that is, under low-load operating conditions, the regeneration regulating valve 30 switches from flow regulation to pressure regulation, and the actual pressure P of the hydrogen purification and drying system is adjusted by adjusting the opening of the regeneration regulating valve 30. E1 Reaching the pressure rating P E , Hydrogen purification and drying system in P E Stable operation.

[0066] The hydrogen purification and drying system provided by the utility model can change the control mode of purification pressure and regeneration hydrogen flow rate according to the change of its operation load, so as to realize the stable operation of the hydrogen purification and drying system at low load.

[0067] In some embodiments, the regeneration regulating valve 30 is disposed on the regeneration gas inlet pipeline and / or the regeneration gas outlet pipeline, and the flow detector 32 is disposed on the regeneration gas inlet pipeline and / or the regeneration gas outlet pipeline.

[0068] Specifically, the regeneration regulating valve 30 and the flow detector 32 may be arranged in various combinations: for example, the regeneration regulating valve 30 and the flow detector 32 are both arranged in the regeneration gas inlet pipeline; or, the regeneration regulating valve 30 and the flow detector 32 are both arranged in the regeneration gas outlet pipeline (for example, Figures 1 to 3 As shown); or, the regeneration regulating valve 30 is arranged on the regeneration gas inlet pipeline, and the flow detector 32 is arranged on the regeneration gas outlet pipeline; or, the regeneration regulating valve 30 is arranged on the regeneration gas outlet pipeline, and the flow detector 32 is arranged on the regeneration gas inlet pipeline; or, the regeneration regulating valve 30 is arranged on the regeneration gas inlet pipeline and the regeneration gas outlet pipeline respectively, and the flow detector 32 is arranged on the regeneration gas inlet pipeline or / and the regeneration gas outlet pipeline, etc.

[0069] The flow detector 32 is electrically connected to the regeneration regulating valve 30 through the controller, and the flow information of the regeneration hydrogen obtained by the flow detector 32 is transmitted to the controller through the wire. The controller compares and analyzes the flow information of the regeneration hydrogen obtained by the flow detector 32 and the internal preset regeneration hydrogen flow rated value. The controller sends the control information to the positioner of the regeneration regulating valve 30 through the wire according to the analysis result, so that the regeneration regulating valve 30 performs the corresponding operation and determines the opening of the regeneration regulating valve 30. For example, if the flow of the regeneration hydrogen obtained by the flow detector 32 is less than the regeneration hydrogen flow rated value, the opening of the regeneration regulating valve 30 is increased; otherwise, the opening of the regeneration regulating valve 30 is reduced.

[0070] The flow detector 32 arranged on the regeneration gas inlet pipeline and / or the regeneration gas outlet pipeline can obtain the flow of regeneration hydrogen in real time. The controller determines the opening of the regeneration regulating valve 30 according to the rated value of the regeneration hydrogen flow on the regeneration gas inlet pipeline and / or the regeneration gas outlet pipeline and the real-time obtained flow of regeneration hydrogen, so that the real-time obtained flow of regeneration hydrogen reaches the rated value of the regeneration hydrogen flow. The rated value of the regeneration hydrogen flow generally accounts for 20% of the total flow of product hydrogen in the total product pipeline 40.

[0071] In some embodiments, the regeneration regulating valve 30 is disposed on the regeneration gas inlet pipeline and / or the regeneration gas outlet pipeline, and the flow detector 32 is disposed on the product gas outlet pipeline.

[0072] Specifically, the regeneration regulating valve 30 and the flow detector 32 may be arranged in the following manner: the regeneration regulating valve 30 is arranged in the regeneration gas inlet pipeline, and the flow detector 32 is arranged in the product gas outlet pipeline; or, the regeneration regulating valve 30 is arranged in the regeneration gas outlet pipeline, and the flow detector 32 is arranged in the product gas outlet pipeline; or, the regeneration regulating valve 30 is arranged in the regeneration gas outlet pipeline and the regeneration gas inlet pipeline, and the flow detector 32 is arranged in the product gas outlet pipeline.

[0073] A flow detector 32 is provided on the product gas outlet pipeline. The flow detector 32 obtains the flow of product hydrogen on the product gas outlet pipeline in real time. The flow detector 32 on the product gas outlet pipeline is electrically connected to the regeneration regulating valve 30 through the controller. The flow information of the product hydrogen obtained by the flow detector 32 is transmitted to the controller through the wire. The controller compares and analyzes the flow information of the product hydrogen obtained by the flow detector 32 and the internal preset regeneration hydrogen flow rating. The controller sends the control information to the positioner of the regeneration regulating valve 30 through the wire according to the analysis result, so that the regeneration regulating valve 30 performs the corresponding operation and determines the opening of the regeneration regulating valve 30. For example, if the regeneration hydrogen flow rating is 20%, the product hydrogen flow rating on the product gas outlet pipeline is 80%. When the product hydrogen flow obtained by the flow detector 32 is less than the product hydrogen flow rating, the opening of the regeneration regulating valve 30 is reduced; otherwise, the opening of the regeneration regulating valve 30 is increased. By adjusting the opening of the regeneration regulating valve 30, the flow of the product hydrogen obtained in real time on the product gas outlet pipeline can reach 75%.

[0074] In the embodiment of the present application, the sum of the flow rate of the regenerated hydrogen on the regeneration gas outlet pipeline or the regeneration gas inlet pipeline and the flow rate of the product hydrogen on the product gas outlet pipeline is equal to the total flow rate of the product hydrogen on the product total pipeline 40. There are two ways to adjust the flow rate of the regenerated hydrogen on the regeneration gas outlet pipeline. One is to determine the opening of the regeneration regulating valve 30 based on the flow detector 32 set on the product gas outlet pipeline, and the other is to determine the opening of the regeneration regulating valve 30 based on the flow detector 32 set on the regeneration gas outlet pipeline or the regeneration gas inlet pipeline. Those skilled in the art can select the setting position of the flow detector 32 according to actual needs. When the operating load of the hydrogen purification and drying system is greater than the load threshold value such as 20%, the opening of the regeneration regulating valve 30 can be adjusted so that the actual flow rate of the regenerated hydrogen on the regeneration gas outlet pipeline or the regeneration gas inlet pipeline reaches the rated value of the regeneration hydrogen flow rate, so that the flow rate of the regenerated hydrogen in the hydrogen purification and drying system is always maintained at the rated value of the flow rate, and the stable operation of the hydrogen purification and drying system is maintained.

[0075] In some embodiments, a product regulating valve 20 is provided on the product gas outlet pipeline, and the pressure detector 22 is electrically connected to the product regulating valve 20 .

[0076] Specifically, Figures 1 to 4 As shown, the pressure detector 22 is arranged on the product gas outlet pipeline or the regeneration gas outlet pipeline, and the product gas outlet pipeline is provided with a product regulating valve 20, which is electrically connected to the pressure detector 22 through the controller. The pressure detector 22 obtains the pressure value information of the hydrogen purification and drying system in real time and transmits it to the controller through the wire. The controller compares and analyzes the pressure value information of the hydrogen purification and drying system obtained by the pressure detector 22 and the internally preset pressure rating of the hydrogen purification and drying system. The controller sends the control information to the positioner of the product regulating valve 20 through the wire according to the analysis result, so that the product regulating valve 20 performs the corresponding operation and determines the opening degree of the product regulating valve 20.

[0077] It should be noted that the pressure detector 22 is electrically connected to the product regulating valve 20 and the regeneration regulating valve 30 respectively through the controller. Therefore, the control information of the controller can also be sent to the positioner of the regeneration regulating valve 30, so that the regeneration regulating valve 30 performs corresponding operations and determines the opening of the regeneration regulating valve 30.

[0078] When the operating load of the hydrogen purification and drying system is greater than the load threshold, the opening of the regeneration regulating valve 30 is determined based on the rated value of the regenerated hydrogen flow rate, and the opening of the product regulating valve 20 is determined based on the rated pressure value of the hydrogen purification and drying system; when the operating load of the hydrogen purification and drying system is not greater than the load threshold, the opening of the regeneration regulating valve 30 is determined based on the rated pressure value of the hydrogen purification and drying system, and the product regulating valve 20 is closed. Through the mutual cooperation of the flow detector 32, the pressure detector 22, the regeneration regulating valve 30 and the product regulating valve 20, the stable operation of the hydrogen purification and drying system under different operating loads is achieved.

[0079] Wherein, a regeneration regulating valve 30 is arranged on the regeneration gas outlet pipeline or the regeneration gas inlet pipeline, and a product regulating valve 20 is arranged on the product gas outlet pipeline. In order to make the flow range of the regeneration regulating valve 30 and the product regulating valve 20 within their optimal regulating range, the product regulating valve 20 is set according to the rated value of the product hydrogen flow on the product gas outlet pipeline, and the regeneration regulating valve 30 is set according to the rated value of the regeneration hydrogen flow on the regeneration gas outlet pipeline or the regeneration gas inlet pipeline. Since the flow of the regeneration hydrogen is less than 20% of the total gas production under the rated power, when selecting the product regulating valve 20 and the regeneration regulating valve 30, the optimal flow range of the product regulating valve 20 is greater than the optimal flow range of the regeneration regulating valve 30. For example, if the flow of the product regulating valve 20 is 80% of the rated gas processing capacity, the regeneration regulating valve 30 is 20% of the rated gas processing capacity; wherein the rated gas processing capacity is the amount of hydrogen that the hydrogen purification and drying system can process.

[0080] For example, a flow detector 32 and a regeneration regulating valve 30 are provided on the regeneration gas outlet pipeline, and the flow detector 32 is electrically connected to the regeneration regulating valve 30 through a controller; a pressure detector 22 is provided on the product gas outlet pipeline and is electrically connected to the product regulating valve 20, and the pressure detector 22 is electrically connected to the product regulating valve 20 through a controller. After the regenerated hydrogen is dried by the auxiliary drying tower, it is filtered by the regeneration hydrogen filter 31 through the regeneration gas outlet pipeline and directly output to the hydrogen storage tank, and an independent flow detector 32 and a regeneration regulating valve 30 are provided on the regeneration gas outlet pipeline, which are designed in parallel with the product regulating valve 20 and the pressure detector 22 on the product gas outlet pipeline, so that the flow rate of the regenerated hydrogen used for the regeneration drying tower can be flexibly adjusted. Among them, the product gas outlet pipeline controls the pressure of the hydrogen purification drying system based on the pressure detector 22 and the product regulating valve 20. The regeneration gas outlet pipeline adjusts the flow rate of the regenerated hydrogen in the regeneration gas outlet pipeline based on the flow detector 32 and the regeneration regulating valve 30. The flow detector 32 can perform targeted detection on the flow rate of the regeneration hydrogen on the regeneration gas outlet pipeline, and increase the opening of the regeneration regulating valve 30 on the regeneration gas outlet pipeline, or reduce the opening of the product regulating valve 20 on the product gas outlet pipeline to increase the flow rate of the regeneration hydrogen entering the regeneration drying tower. When the operating power of the hydrogen production system is relatively low, priority is given to ensuring the gas flow rate of the regeneration gas pipeline, ensuring the regeneration effect of the drying tower, ensuring the normal operation of the entire hydrogen purification and drying system, and outputting product gas with qualified gas dew point, which can effectively adapt to the power fluctuation of hydrogen production from renewable energy and ensure the normal operation of the hydrogen purification and drying system.

[0081] It should be noted that, in this example, the pressure detector 22 on the product gas outlet pipeline is also electrically connected to the regeneration regulating valve 30 (eg, Figures 1 to 3 Alternatively, the pressure detector 22 on the regeneration gas outlet pipeline is electrically connected to the regeneration regulating valve 30 (as shown in FIG. Figure 4 As shown in FIG. 1 , when the operating load of the hydrogen purification and drying system is lower than 20%, the product regulating valve 20 is closed, so that the regeneration regulating valve 30 is controlled by pressure instead of flow rate.

[0082] It can be understood that in the first operation stage and the second operation stage of the hydrogen purification and drying system, the product regulating valve 20 is always in the open state.

[0083] In some embodiments, the flow detector 32 is electrically connected to the product regulating valve 20 .

[0084] Specifically, a flow detector 32 is provided on one of the product gas outlet pipeline, the regeneration gas outlet pipeline or the regeneration gas inlet pipeline, and the flow detector 32 is electrically connected to the product regulating valve 20 through the controller. The gas (regeneration hydrogen or product hydrogen) flow information obtained by the flow detector 32 is transmitted to the controller through the wire, and the controller compares and analyzes the gas flow information obtained by the flow detector 32 and the internal preset regeneration hydrogen flow rated value or product hydrogen flow rated value. The controller sends the control information to the positioner of the product regulating valve 20 through the wire according to the analysis result, so that the product regulating valve 20 performs the corresponding operation. Exemplarily, if the operating load of the hydrogen purification and drying system is greater than the preset threshold value, the opening of the product regulating valve 20 is determined based on the regeneration hydrogen flow rated value or the product hydrogen flow rated value, so that the flow of the product hydrogen in the product outlet pipe reaches the product hydrogen flow rated value, and the flow of the regeneration hydrogen in the regeneration outlet pipe or the regeneration inlet pipe reaches the regeneration hydrogen flow rated value.

[0085] In some embodiments, Figures 1 to 3 As shown, the regeneration regulating valve 30 is arranged on the regeneration gas inlet pipeline and / or the regeneration gas outlet pipeline, the flow detector 32 is arranged on the regeneration gas inlet pipeline and / or the regeneration gas outlet pipeline; the pressure detector 22 is arranged on the product gas outlet pipeline.

[0086] Specifically, the regeneration regulating valve 30 is arranged on the regeneration gas inlet pipeline and / or the regeneration gas outlet pipeline, and the regeneration regulating valve 30 can adjust the flow rate of the regeneration hydrogen or adjust the pressure of the hydrogen purification and drying system. The flow detector 32 is arranged on the regeneration gas inlet pipeline and / or the regeneration gas outlet pipeline, and the flow detector 32 can obtain the flow rate of the regeneration hydrogen in real time. The pressure detector 22 is arranged on the product gas outlet pipeline, and the product regulating valve 20 can adjust the flow rate of the product hydrogen or adjust the pressure of the hydrogen purification and drying system in real time.

[0087] The pressure detector 22 on the product gas outlet pipeline is electrically connected to the product regulating valve 20 and the regeneration regulating valve 30 at the same time. When the operating load of the hydrogen purification and drying system is greater than the load threshold (such as 20%), the product regulating valve 20 determines the opening of the product regulating valve 20 based on the pressure rating of the hydrogen purification and drying system; otherwise, the product regulating valve 20 is in a closed state, so that the regeneration regulating valve 30 is controlled by pressure instead of flow control.

[0088] like Figure 5 As shown, during the operation start-up process of the hydrogen purification and drying system, the control logic of the regeneration regulating valve 30 is:

[0089] When the operating load of the hydrogen purification and drying system is greater than a load threshold value, such as 20%, the opening of the regeneration regulating valve 30 can be adjusted to make the actual flow rate F of the regenerated hydrogen E1 Reach the regeneration hydrogen flow rate F E , so that the flow rate of regenerated hydrogen in the hydrogen purification and drying system is always maintained at the rated flow value F E (F E =F E1 ) to maintain the stable operation of the hydrogen purification and drying system.

[0090] When the operating load of the hydrogen purification and drying system is not greater than a load threshold value, such as 20%, the pressure of the hydrogen purification and drying system can be maintained at a rated pressure value by adjusting the opening of the regeneration regulating valve 30 to maintain the stable operation of the hydrogen purification and drying system. That is, under low-load operation conditions, the regeneration regulating valve 30 switches from flow regulation to pressure regulation, and the actual pressure P of the hydrogen purification and drying system is adjusted by adjusting the opening of the regeneration regulating valve 30. E1 Reaching the pressure rating P E , so that the hydrogen purification drying system in P E (P E =P E1 ) to run stably.

[0091] The control logic of the product regulating valve 20 is:

[0092] When the operating load of the hydrogen purification and drying system is greater than a load threshold value such as 20%, the pressure value of the hydrogen purification and drying system is obtained in real time through the pressure detector 22 on the product gas outlet pipeline, and the opening of the product regulating valve 20 is adjusted to make the actual pressure P of the hydrogen purification and drying system E1 Reaching the pressure rating P E , so that the hydrogen purification drying system in P E (P E =P E1 ) to run stably.

[0093] When the operating load of the hydrogen purification and drying system is not greater than a load threshold value, such as 20%, the product regulating valve 20 is closed.

[0094] In the embodiment of the present application, when the operating load of the hydrogen purification and drying system is greater than 20%, the pressure of the hydrogen purification and drying system is controlled by the product regulating valve 20, and the regeneration regulating valve 30 controls the flow of the regenerated hydrogen; when the operating load is ≤20%, the product regulating valve 20 is closed, and the regeneration regulating valve 30 switches from flow regulation control to pressure regulation control, and the regeneration regulating valve 30 controls the system pressure, and all hydrogen goes through the regeneration gas introduction pipeline and the regeneration gas outlet pipeline, so as to realize the stable operation of the hydrogen purification and drying system under low load. And the hydrogen purification and drying system can meet the control requirements of the hydrogen purification and drying system under ultra-low load conditions by using the two regulating valves (regeneration regulating valve 30 and product regulating valve 20) configured by itself, reduce the number of valve settings, and simplify the control process.

[0095] In some embodiments, the hydrogen purification drying system further includes a third drying tower 12, and the hydrogen purification drying system includes a first operation stage, a second operation stage and a third operation stage in each operation cycle; wherein the third drying tower 12 is an auxiliary working drying tower, and the first drying tower 10, the second drying tower 11 and the third drying tower 12 serve as a main working drying tower, an auxiliary working drying tower and a regeneration drying tower in turn in each operation stage; the auxiliary working drying tower is configured to adsorb the regenerated hydrogen obtained by the regeneration drying tower to obtain dry regenerated hydrogen.

[0096] Specifically, Figures 1 to 3 As shown, the hydrogen purification and drying system includes a first operation stage, a second operation stage and a third operation stage in each operation cycle. The first drying tower 10, the second drying tower 11 and the third drying tower 12 respectively serve as a main working drying tower, an auxiliary working drying tower and a regeneration drying tower in turn in each operation stage, and each operation cycle is repeated to realize the cyclic purification and drying of hydrogen and improve the purity and purification efficiency of hydrogen.

[0097] like Figure 1As shown, the structure of the hydrogen purification and drying system of the utility model includes: a first drying tower 10, a second drying tower 11 and a third drying tower 12; wherein, the output end of the hydrogen production system is connected to the first drying tower 10, the second drying tower 11 and the third drying tower 12 respectively after being deoxygenated by the deoxidizer and then condensed by the condenser. Specifically, the output end of the condenser is directly connected to the corresponding first drying tower 10, the second drying tower 11 and the third drying tower 12 through the first valve 80, the second valve 81 and the third valve 82 respectively; the pipeline between the first valve 80 and the first drying tower 10 is connected to the gas cooler 60 through the fourth valve 83, the pipeline between the second valve 81 and the second drying tower 11 is connected to the gas cooler 60 through the fifth valve 84, and the pipeline between the third valve 82 and the third drying tower 12 is connected to the gas cooler 60 through the sixth valve 85; the fourth The pipeline between the valve 83 and the first drying tower 10 is connected to the gas-water separator 70 through the seventh valve 86, the pipeline between the fifth valve 84 and the second drying tower 11 is connected to the gas-water separator 70 through the eighth valve 87, and the pipeline between the sixth valve 85 and the third drying tower 12 is connected to the gas-water separator 70 through the ninth valve 88; the gas cooler 60 is directly connected to the gas-water separator 70, the gas cooler 60 has a chilled water inlet and a chilled water return port, and the outlet end of the gas-water separator 70 is provided with a tenth valve 89 for liquid discharge. The first drying tower 10, the second drying tower 11 and the third drying tower 12 are connected to the product gas outlet pipeline through the eleventh valve 90, the twelfth valve 91 and the thirteenth valve 92 respectively, and the product gas outlet pipeline is connected to the product main pipeline 40 through the main hydrogen filter 21; the first drying tower 10, the second drying tower 11 and the third drying tower 12 are connected to the regeneration gas outlet pipeline through the fourteenth valve 93, the fifteenth valve 94 and the sixteenth valve 95 respectively, and the regeneration gas outlet pipeline is connected to the product main pipeline 40 through the regeneration hydrogen filter 31, and the product main pipeline 40 is connected to the hydrogen storage tank 50. Among them, the regeneration regulating valve 30 is set on the pipeline between the regeneration hydrogen filter 31 and the product main pipeline 40.

[0098] In some embodiments, Figures 1 to 3 As shown, the regeneration gas outlet pipeline includes a regeneration gas outlet branch, which is used to lead the dry regeneration hydrogen out of the auxiliary working drying tower.

[0099] Specifically, the product outlet pipeline, the regeneration gas inlet pipeline, the regeneration gas outlet pipeline and the regeneration gas outlet branch of the present application are introduced at each stage of the operation of the hydrogen purification and drying system.

[0100] For example, Figure 1As shown, in the first operation stage, the first drying tower 10 is the main working drying tower, the second drying tower 11 is the auxiliary working drying tower, and the third drying tower 12 is the regeneration drying tower. The first drying tower 10 is directly connected to the main hydrogen filter 21 through the product outlet pipeline, and the product outlet pipeline between the first drying tower 10 and the main hydrogen filter 21 is provided with an eleventh valve 90; the main hydrogen filter 21 and the third drying tower 12 are connected with a regeneration hydrogen introduction pipeline connected to the product outlet pipeline, and the regeneration hydrogen introduction pipeline is provided with a thirteenth valve 92 A regeneration gas outlet pipeline is provided between the third drying tower 12 and the regeneration hydrogen filter 31, and a sixteenth valve 95 is provided on the regeneration gas outlet pipeline close to the third drying tower 12. Alternatively, the third drying tower 12 may be connected to the gas cooler 60, the gas-water separator 70 and the second drying tower 11 through the regeneration gas outlet branch, and then connected to the regeneration hydrogen filter 31 through the regeneration gas outlet pipeline, that is, the regeneration gas outlet branch is a part of the regeneration gas outlet pipeline, and a fifteenth valve 94 is provided on the side of the regeneration gas outlet branch close to the second drying tower 11. The crude hydrogen obtained by the hydrogen production system is deoxygenated by the deoxidizer and condensed by the condenser to obtain deoxygenated hydrogen and enter the first drying tower 10 for molecular sieve adsorption treatment. The purified hydrogen obtained is divided into two parts. One part of the hydrogen (80%) enters the main hydrogen filter 21 and then enters the hydrogen storage tank 50. Another part of the hydrogen (20%) is used as regenerated hydrogen and first enters the third drying tower 12 to desorb the molecular sieve in the third drying tower 12. Then, it enters the second drying tower 11 after passing through the gas cooler 60 and the gas-water separator 70 to adsorb water in the regenerated hydrogen. The hydrogen adsorbed by the second drying tower 11 enters the regenerated hydrogen filter 31 and then is merged into the product main pipeline 40 and enters the hydrogen storage tank 50.

[0101] like Figure 2As shown, in the second operation stage, the first drying tower 10 is a regeneration drying tower, the second drying tower 11 is a main working drying tower, and the third drying tower 12 is an auxiliary working drying tower. The second drying tower 11 is directly connected to the main hydrogen filter 21 through a product outlet pipeline, and a twelfth valve 91 is arranged on the product outlet pipeline between the second drying tower 11 and the main hydrogen filter 21; a regeneration hydrogen inlet pipeline connected to the product outlet pipeline is connected between the main hydrogen filter 21 and the first drying tower 10, and an eleventh valve 90 is arranged on the regeneration hydrogen inlet pipeline; a regeneration gas outlet pipeline is arranged between the first drying tower 10 and the regeneration hydrogen filter 31, and a fourteenth valve 93 is arranged on the regeneration gas outlet pipeline close to the first drying tower 10 side, or the first drying tower 10 can be connected to the gas cooler 60, the gas-water separator 70 and the third drying tower 12 through the regeneration gas outlet branch, and then connected to the regeneration hydrogen filter 31 through the regeneration gas outlet pipeline, that is, the regeneration gas outlet branch is a part of the regeneration gas outlet pipeline, and a sixteenth valve 95 is arranged on the side of the regeneration gas outlet branch close to the third drying tower 12. The crude hydrogen obtained by the hydrogen production system is deoxygenated by the deoxidizer and condensed by the condenser to obtain deoxygenated hydrogen and enter the second drying tower 11 for molecular sieve adsorption treatment. The purified hydrogen obtained is divided into two parts. One part of the hydrogen (80%) enters the main hydrogen filter 21 and then enters the hydrogen storage tank 50. Another part of the hydrogen (20%) is used as regenerated hydrogen and first enters the first drying tower 10 to desorb the molecular sieve in the first drying tower 10. Then, it enters the third drying tower 12 after passing through the gas cooler 60 and the gas-water separator 70 to adsorb water in the regenerated hydrogen. The hydrogen adsorbed by the third drying tower 12 enters the regenerated hydrogen filter 31 and then is merged into the product main pipeline 40 and enters the hydrogen storage tank 50.

[0102] like Figure 3 As shown, in the third operation stage, the first drying tower 10 is an auxiliary working drying tower, the second drying tower 11 is a regeneration drying tower, and the third drying tower 12 is a main working drying tower.

[0103] The third drying tower 12 is directly connected to the main hydrogen filter 21 through a product outlet pipeline, and a thirteenth valve 92 is arranged on the product outlet pipeline between the third drying tower 12 and the main hydrogen filter 21; a regeneration hydrogen inlet pipeline connected to the product outlet pipeline is connected between the main hydrogen filter 21 and the second drying tower 11, and a twelfth valve 91 is arranged on the regeneration hydrogen inlet pipeline; a regeneration gas outlet pipeline is arranged between the second drying tower 11 and the regeneration hydrogen filter 31, and a fifteenth valve 94 is arranged on the regeneration gas outlet pipeline close to the second drying tower 11 side, or the second drying tower 11 can be connected to the gas cooler 60, the gas-water separator 70 and the first drying tower 10 through the regeneration gas outlet branch, and then connected to the regeneration hydrogen filter 31 through the regeneration gas outlet pipeline, that is, the regeneration gas outlet branch is a part of the regeneration gas outlet pipeline, and a fourteenth valve 93 is arranged on the side of the regeneration gas outlet branch close to the third drying tower 12. The crude hydrogen obtained by the hydrogen production system is deoxygenated by the deoxidizer and condensed by the condenser to obtain deoxygenated hydrogen and enter the third drying tower 12 for molecular sieve adsorption treatment. The purified hydrogen obtained is divided into two parts. One part of the hydrogen (80%) enters the main hydrogen filter 21 and then enters the hydrogen storage tank 50. Another part of the hydrogen (20%) is used as regenerated hydrogen and first enters the second drying tower 11 to desorb the molecular sieve in the second drying tower 11. Then, it enters the first drying tower 10 after passing through the gas cooler 60 and the gas-water separator 70 to adsorb water in the regenerated hydrogen. The hydrogen adsorbed by the first drying tower 10 enters the regenerated hydrogen filter 31 and then is merged into the product main pipeline 40 and enters the hydrogen storage tank 50.

[0104] The first drying tower 10, the second drying tower 11 and the third drying tower 12 are respectively located in the main working drying tower, the auxiliary working drying tower and the regeneration drying tower, and the above steps are repeated.

[0105] It can be understood that in the first operation stage, the second operation stage and the third operation stage of the hydrogen purification and drying system, the regeneration regulating valve 30 is always in an open state. The first valve 80 to the sixteenth valve 95 are cut-off valves 23, which can be mechanical valves, electric valves or pneumatic valves, and can control the conduction and closing of the corresponding pipeline.

[0106] In some embodiments, the regeneration regulating valve 30 and the flow detector 32 are disposed on the regeneration gas outlet branch.

[0107] Specifically, the regeneration regulating valve 30 and the flow detector 32 are both arranged on the regeneration gas outlet branch. The flow detector 32 can obtain the flow of regenerated hydrogen on the regeneration outlet gas branch in real time. The controller compares and analyzes the flow of regenerated hydrogen obtained by the flow detector 32 and the internally preset regeneration hydrogen flow rated value. The controller sends the control information to the positioner of the regeneration regulating valve 30 through the wire according to the analysis result, so that the regeneration regulating valve 30 performs the corresponding operation.

[0108] In some embodiments, the pressure detector 22 is disposed on the regeneration gas outlet branch.

[0109] Specifically, the pressure detector 22 is arranged on the regeneration gas outlet branch. The pressure detector 22 obtains the pressure value information of the hydrogen purification and drying system in real time and transmits it to the controller through a wire. The controller compares and analyzes the pressure value information of the hydrogen purification and drying system obtained by the pressure detector 22 and the internally preset pressure rating of the hydrogen purification and drying system. The controller sends the control information to the positioner of the product regulating valve 20 through the wire according to the analysis result, so that the product regulating valve 20 performs the corresponding operation and determines the opening degree of the product regulating valve 20.

[0110] In some embodiments, the regeneration regulating valve 30 and the flow detector 32 are both arranged on the regeneration gas outlet branch, the pressure detector 22 is arranged on the product gas outlet pipeline, and the regeneration regulating valve 30 is electrically connected to the flow detector 32 and the pressure detector 22 respectively.

[0111] Specifically, a regeneration regulating valve 30 and a flow detector 32 are provided on the regeneration gas outlet branch, and the flow detector 32 and the regeneration regulating valve 30 are electrically connected through a controller; a product regulating valve 20 and a pressure detector 22 are provided on the product gas outlet pipeline, and the pressure detector 22 is electrically connected to the regeneration regulating valve 30 and the product regulating valve 20 through the controller. The regeneration regulating valve 30 on the regeneration gas outlet branch is electrically connected to the flow detector 32 and the pressure detector 22 at the same time. When the operating load of the hydrogen purification and drying system is greater than the load threshold (such as 20%), the product regulating valve 20 determines the opening of the product regulating valve 20 based on the pressure rating of the hydrogen purification and drying system, and the regeneration regulating valve 30 determines the opening of the regeneration regulating valve 30 based on the regeneration hydrogen flow rating; otherwise, the product regulating valve 20 is in a closed state, so that the regeneration regulating valve 30 is controlled by pressure instead of flow.

[0112] In some embodiments, a shut-off valve 23 is provided on the regeneration gas outlet pipeline and / or the product gas outlet pipeline.

[0113] Specifically, Figures 1 to 3As shown, a shut-off valve 23 is provided on the regeneration gas outlet pipeline between the regeneration regulating valve 30 and the regeneration hydrogen filter 31, or / and a shut-off valve 23 is provided on the product gas outlet pipeline between the product regulating valve 20 and the product hydrogen filter. Through the cooperation of the shut-off valves 23 on the regeneration gas outlet pipeline and the product gas outlet pipeline, when the hydrogen purification and drying system stops running, a stable pressure is formed inside the hydrogen purification and drying system, so that when the hydrogen purification and drying system is started again, the system can quickly enter the operating state.

[0114] In some embodiments, the regeneration regulating valve 30 is a ball valve; and the shut-off valve 23 is a stop valve.

[0115] Specifically, the regeneration regulating valve 30 and the product regulating valve 20 are both ball valves, which can control the opening of the regeneration regulating valve 30 and the product regulating valve 20; the cut-off valve 23 is a stop valve, which can control the conduction and closing of the product gas outlet pipeline and the regeneration gas outlet pipeline.

[0116] It can be understood that in the first operation stage, the second operation stage and the third operation stage of the hydrogen purification and drying system, the shut-off valve 23 on the regeneration gas outlet pipeline and / or the product gas outlet pipeline is always in an open state.

[0117] A second aspect of the present invention provides a hydrogen production system, comprising the hydrogen purification and drying system described in any embodiment of the present application.

[0118] The specific technical features and effects of the hydrogen production system are consistent with those of the hydrogen purification and drying system, and will not be repeated in this application.

[0119] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the utility model. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other to form a technical solution.

Claims

1. A hydrogen purification and drying system, characterized in that: include: At least two drying towers, wherein the two drying towers are a first drying tower and a second drying tower, the hydrogen purification drying system is configured to operate periodically, and the hydrogen purification drying system includes a first operation stage and a second operation stage in each operation cycle, and the first drying tower and the second drying tower are used as a main working drying tower and a regeneration drying tower in turn in each operation stage; The main working drying tower is configured to perform adsorption treatment on the crude hydrogen prepared by the hydrogen production system to obtain purified hydrogen; A product gas outlet pipeline, used for exporting the first part of the hydrogen in the purified hydrogen from the main working drying tower; a regeneration gas introduction pipeline for introducing the second part of the hydrogen in the purified hydrogen into the regeneration drying tower; the regeneration drying tower is configured to regenerate the adsorption material of the regeneration drying tower using the second part of the hydrogen in the purified hydrogen to obtain regenerated hydrogen; A regeneration gas outlet pipeline, used for exporting the regeneration hydrogen from the regeneration drying tower; At least one pressure detector is arranged on the product gas outlet pipeline and / or the regeneration gas outlet pipeline; A regeneration regulating valve and a flow detector are respectively arranged on one of the regeneration gas inlet pipeline, the regeneration gas outlet pipeline and the product gas outlet pipeline, the regeneration regulating valve and the flow detector are electrically connected, and the regeneration regulating valve is electrically connected to the at least one pressure detector.

2. The hydrogen purification and drying system according to claim 1, characterized in that: The regeneration regulating valve is arranged on the regeneration gas inlet pipeline and / or the regeneration gas outlet pipeline, and the flow detector is arranged on the regeneration gas inlet pipeline and / or the regeneration gas outlet pipeline.

3. The hydrogen purification and drying system according to claim 1, characterized in that: The regeneration regulating valve is arranged on the regeneration gas inlet pipeline and / or the regeneration gas outlet pipeline, and the flow detector is arranged on the product gas outlet pipeline.

4. The hydrogen purification and drying system according to any one of claims 1 to 3, characterized in that: The product gas outlet pipeline is provided with a product regulating valve, and the pressure detector is electrically connected to the product regulating valve.

5. The hydrogen purification and drying system according to claim 4, characterized in that: The flow detector is electrically connected to the product regulating valve.

6. The hydrogen purification and drying system according to claim 1, characterized in that: The regeneration regulating valve is arranged on the regeneration gas inlet pipeline and / or the regeneration gas outlet pipeline, the flow detector is arranged on the regeneration gas inlet pipeline and / or the regeneration gas outlet pipeline; the pressure detector is arranged on the product gas outlet pipeline.

7. The hydrogen purification and drying system according to claim 1, characterized in that: The hydrogen purification drying system also includes a third drying tower. The hydrogen purification drying system includes a first operation stage, a second operation stage and a third operation stage in each operation cycle; wherein the third drying tower is an auxiliary working drying tower, and the first drying tower, the second drying tower and the third drying tower are respectively used as a main working drying tower, an auxiliary working drying tower and a regeneration drying tower in turn in each operation stage; the auxiliary working drying tower is configured to adsorb the regenerated hydrogen obtained by the regeneration drying tower to obtain dry regenerated hydrogen.

8. The hydrogen purification and drying system according to claim 7, characterized in that: The regeneration gas outlet pipeline includes a regeneration gas outlet branch, which is used to guide the dry regeneration hydrogen out of the auxiliary working drying tower.

9. The hydrogen purification and drying system according to claim 8, characterized in that: The regeneration regulating valve and the flow detector are arranged on the regeneration gas outlet branch.

10. The hydrogen purification and drying system according to claim 8, characterized in that: The pressure detector is arranged on the regeneration gas outlet branch.

11. The hydrogen purification and drying system according to claim 8, characterized in that: The regeneration regulating valve and the flow detector are both arranged on the regeneration gas outlet branch, the pressure detector is arranged on the product gas outlet pipeline, and the regeneration regulating valve is electrically connected to the flow detector and the pressure detector respectively.

12. The hydrogen purification and drying system according to claim 1, characterized in that: The regeneration gas outlet pipeline and / or the product gas outlet pipeline are provided with a cut-off valve.

13. The hydrogen purification and drying system according to claim 12, characterized in that: The regeneration regulating valve is a ball valve; the cut-off valve is a stop valve.

14. A hydrogen production system, characterized in that: The hydrogen production system comprises the hydrogen purification and drying system according to any one of claims 1-13.

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