Method and device for controlling regeneration drying tower in hydrogen purification system and hydrogen purification system

Abstract

The invention provides a control method and device for a regeneration drying tower in a hydrogen purification system and the hydrogen purification system. A first hydrogen dew point value at an outlet of the regeneration drying tower is obtained, whether the heating stage of the regeneration drying tower meets a preset ending condition or not is judged according to the first hydrogen dew point value, and if the preset ending condition is met, the regeneration drying tower is controlled. If yes, controlling the regeneration drying tower to enter a cold blowing stage. The opportunity for switching the regeneration drying tower from the heating stage to the cold blowing stage is determined according to the first hydrogen dew point value, and compared with the mode of switching the heating stage and the cold blowing stage according to a fixed period in the prior art, the method provided by the invention better conforms to the actual working condition of the hydrogen purification system; and the situation of energy waste caused by incomplete desorption of the molecular sieve in the regeneration drying tower can be effectively avoided, so that the regeneration efficiency can be improved, and the requirements of green electricity fluctuation scenes are met.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen production by electrolyzing water, and particularly relates to a control method, device and hydrogen purification system for a regeneration drying tower in a hydrogen purification system. Background Art

[0002] The electrolytic water hydrogen production system mainly consists of subsystems such as an electrolytic cell, a hydrogen purification system, a separation system, an auxiliary system, a public auxiliary system, and an electrical system. Among them, the hydrogen purification system is mainly used for hydrogen purification treatment to obtain high-purity hydrogen with a purity ≥ 99.99%. The hydrogen purification system mainly consists of equipment such as a deoxidation tower, a main drying tower, a regeneration drying tower, a gas-water separator, and a condenser. In the current mainstream purification scheme, a secondary drying tower is also set in the hydrogen purification system to dry the hydrogen at the outlet of the regeneration drying tower.

[0003] The regeneration drying tower includes two stages, a heating stage and a cold blow stage, within a working cycle. In the heating stage, the regeneration drying tower is mainly used for molecular sieve desorption; in the cold blow stage, the temperature is reduced by continuously introducing gas into the regeneration drying tower.

[0004] During the entire working process of the regeneration drying tower, it is particularly important to reasonably determine the switching timing between the heating stage and the cold blow stage of the regeneration drying tower. If the heating stage time is too short, it will easily lead to incomplete molecular sieve desorption in the regeneration drying tower, and if it is too long, it will easily cause energy waste. Summary of the Invention

[0005] One object of the present application is to provide a control method for a regeneration drying tower in a hydrogen purification system to solve the problems that the existing hydrogen purification system is prone to incomplete molecular sieve desorption in the regeneration drying tower and energy waste. Another object of the present application is to provide a control device for a regeneration drying tower in a hydrogen purification system. Another object of the present application is to provide a hydrogen purification system. Another object of the present application is to provide a terminal device. Another object of the present application is to provide a computer-readable storage medium.

[0006] To achieve the above objects, the first aspect of the present application discloses a control method for a regeneration drying tower in a hydrogen purification system. This method is applied to a hydrogen purification system, and the hydrogen purification system includes a main drying tower in the main working state and a regeneration drying tower in the regeneration state. The method includes:

[0007] Obtain the first hydrogen dew point value at the outlet of the regeneration drying tower;

[0008] According to the first hydrogen dew point value, determine whether the heating stage of the regeneration drying tower meets the preset end condition;

[0009] If the preset end condition is satisfied, control the regeneration drying tower to enter the cold blow stage.

[0010] Optionally, judging whether the heating stage of the regeneration drying tower meets the preset end condition according to the first hydrogen dew point value includes:

[0011] Compare the first hydrogen dew point value with a preset target hydrogen dew point value. If the first hydrogen dew point value reaches the preset target hydrogen dew point value, it is determined that the heating stage of the regeneration drying tower meets the preset end condition.

[0012] Optionally, the method further includes:

[0013] Obtain a second hydrogen dew point value at the outlet of the hydrogen purification system;

[0014] Judging whether the heating stage of the regeneration drying tower meets the preset end condition according to the first hydrogen dew point value includes:

[0015] Determine a hydrogen dew point ratio according to the first hydrogen dew point value and the second hydrogen dew point value;

[0016] Judge whether the hydrogen dew point ratio is less than or equal to a preset ratio. If the hydrogen dew point ratio is less than or equal to the preset ratio, it is determined that the heating stage of the regeneration drying tower meets the preset end condition.

[0017] Optionally, before determining that the heating stage of the regeneration drying tower meets the preset end condition, the method further includes:

[0018] Compare the first hydrogen dew point value with the first historical hydrogen dew point value obtained at the outlet of the regeneration drying tower at the previous moment;

[0019] If the first hydrogen dew point value is less than the first historical hydrogen dew point value, it is determined that the heating stage of the regeneration drying tower meets the preset end condition.

[0020] Optionally, the hydrogen dew point ratio is determined by the following method:

[0021]

[0022] Where r is the hydrogen dew point ratio; D1 is the first hydrogen dew point value; D2 is the second hydrogen dew point value.

[0023] In a second aspect, the present application discloses a control device for a regeneration drying tower in a hydrogen purification system. The device is applied to the hydrogen purification system. The hydrogen purification system includes a main drying tower in a main working state and a regeneration drying tower in a regeneration state. The device includes:

[0024] An acquisition unit for acquiring a first hydrogen dew point value at the outlet of the regeneration drying tower;

[0025] A processing unit for determining whether the heating stage of the regeneration drying tower meets a preset end condition according to the first hydrogen dew point value;

[0026] A control unit for controlling the regeneration drying tower to enter a cold blow stage if the preset end condition is met.

[0027] Optionally, the processing unit is specifically configured to:

[0028] Compare the first hydrogen dew point value with a preset target hydrogen dew point value, and if the first hydrogen dew point value reaches the preset target hydrogen dew point value, determine that the heating stage of the regeneration drying tower meets the preset end condition.

[0029] Optionally, the acquisition unit is further configured to:

[0030] Acquire a second hydrogen dew point value at the outlet of the hydrogen purification system;

[0031] The processing unit is specifically configured to:

[0032] Determine a hydrogen dew point ratio according to the first hydrogen dew point value and the second hydrogen dew point value;

[0033] Judge whether the hydrogen dew point ratio is less than or equal to a preset ratio, and if the hydrogen dew point ratio is less than or equal to the preset ratio, determine that the heating stage of the regeneration drying tower meets the preset end condition.

[0034] Optionally, the processing unit is further configured to:

[0035] Compare the first hydrogen dew point value with a first historical hydrogen dew point value obtained at the outlet of the regeneration drying tower at the previous moment; if the first hydrogen dew point value is less than the first historical hydrogen dew point value, determine that the heating stage of the regeneration drying tower meets the preset end condition.

[0036] Optionally, the hydrogen dew point ratio is determined by the following method:

[0037]

[0038] Where r is the hydrogen dew point ratio; D1 is the first hydrogen dew point value; D2 is the second hydrogen dew point value.

[0039] In a third aspect, the present application discloses a hydrogen purification system, the hydrogen purification system includes a main drying tower in a main working state and a regeneration drying tower in a regeneration state, and the system further includes:

[0040] The first dew point meter is configured to obtain the first hydrogen dew point value at the outlet of the regeneration drying tower;

[0041] The controller is configured to determine whether the heating stage of the regeneration drying tower meets a preset end condition according to the first hydrogen dew point value; if the preset end condition is met, control the regeneration drying tower to enter the cold blow stage.

[0042] Optionally, the controller is specifically configured to:

[0043] Compare the first hydrogen dew point value with a preset target hydrogen dew point value, and if the first hydrogen dew point value reaches the preset target hydrogen dew point value, determine that the heating stage of the regeneration drying tower meets the preset end condition.

[0044] Optionally, the system further includes:

[0045] The second dew point meter is configured to obtain the second hydrogen dew point value at the outlet of the hydrogen purification system;

[0046] The controller is specifically configured to:

[0047] Determine a hydrogen dew point ratio according to the first hydrogen dew point value and the second hydrogen dew point value;

[0048] Judge whether the hydrogen dew point ratio is less than or equal to a preset ratio, and if the hydrogen dew point ratio is less than or equal to the preset ratio, determine that the heating stage of the regeneration drying tower meets the preset end condition.

[0049] Optionally, the controller is specifically configured to:

[0050] Compare the first hydrogen dew point value with the first historical hydrogen dew point value obtained at the outlet of the regeneration drying tower at the previous moment; if the first hydrogen dew point value is less than the first historical hydrogen dew point value, determine that the heating stage of the regeneration drying tower meets the preset end condition.

[0051] Optionally, the hydrogen dew point ratio is determined by the following method:

[0052]

[0053] where r is the hydrogen dew point ratio; D1 is the first hydrogen dew point value; D2 is the second hydrogen dew point value.

[0054] Fourthly, the present application discloses a terminal device, including:

[0055] It includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the method described above is implemented.

[0056] In a fifth aspect, the present application discloses a computer-readable storage medium storing a computer program, which when executed by a processor implements the method described above.

[0057] Compared with the prior art, in the control method of the regeneration drying tower in the hydrogen purification system provided by the present application, the first hydrogen dew point value at the outlet of the regeneration drying tower is obtained. According to the first hydrogen dew point value, it is determined whether the heating stage of the regeneration drying tower meets a preset end condition. If the preset end condition is met, the regeneration drying tower is controlled to enter the cold blow stage. In the present application, the timing of switching the regeneration drying tower from the heating stage to the cold blow stage is determined according to the first hydrogen dew point value. Compared with the prior art method of switching the heating stage and the cold blow stage according to a fixed cycle, the method provided by the present application is more in line with the actual working conditions of the hydrogen purification system, can effectively avoid the incomplete desorption of the molecular sieve in the regeneration drying tower and the resulting energy waste, thereby improving the regeneration efficiency and meeting the needs of the green power fluctuation scenario. Description of the Drawings

[0058] Figure 1 It is a schematic structural diagram of a hydrogen purification system provided by an embodiment of the present application;

[0059] Figure 2 It is a schematic structural diagram of another hydrogen purification system provided by an embodiment of the present application;

[0060] Figure 3 It is a schematic flow chart corresponding to the control method of the regeneration drying tower in a hydrogen purification system provided by an embodiment of the present application;

[0061] Figure 4 It is a schematic flow chart corresponding to the method for determining whether the heating stage of the regeneration drying tower meets a preset end condition provided by an embodiment of the present application;

[0062] Figure 5 It is a schematic structural diagram of a control device for the regeneration drying tower in a hydrogen purification system provided by an embodiment of the present application;

[0063] Among them, the Figures 1 to 5 description of the attached

[0064] 100 - Hydrogen purification system; 111 - First drying tower; 112 - Second drying tower; 113 - Third drying tower; 121 - First gas - water separator; 122 - Second gas - water separator; 123 - Third gas - water separator; 124 - Fourth gas - water separator; 125 - Fifth gas - water separator; 131 - First condenser; 132 - Second condenser; 133 - Third condenser; 134 - Fourth condenser; 140 - Deoxidation tower; 150 - Water collector; 1601 - First valve; 1602 - Second valve; 1603 - Third valve; 1604 - Fourth valve; 1605 - Fifth valve; 1606 - Sixth valve; 1607 - Seventh valve; 1608 - Eighth valve; 1609 - Ninth valve; 1610 - Tenth valve; 1611 - Eleventh valve; 1612 - Twelfth valve; 170 - First dew - point meter; 180 - Second dew - point meter. Detailed implementation manners

[0065] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present application.

[0066] It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the above - mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to describe the embodiments of the present application here. In addition, the terms "include" and "have" and any variations thereof are intended to cover non - exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0067] In the present application, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation or be constructed and operated in a specific orientation.

[0068] Positional relationships such as "parallel" or "perpendicular" not only include the completely "parallel" or "perpendicular" positional relationships, but also include the positional relationships with an angular deviation within a preset deviation range relative to the completely "parallel" or "perpendicular".

[0069] Moreover, in addition to being used to represent orientation or positional relationships, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0070] In addition, the terms "install", "set", "be provided with", "connect", "be connected", "be sleeved" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, components or parts. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0071] It should be noted that, without conflict, the embodiments and features in the embodiments of this application can be combined with each other. The following will refer to Figures 1 to 5 and will describe this application in detail in combination with the embodiments.

[0072] For an electrolytic water hydrogen production system, it can be a one-to-one structure where one electrolytic cell uses a set of hydrogen purification systems alone, or it can be a multi-to-one structure where multiple electrolytic cells share a set of hydrogen purification systems. The load range that the electrolytic cells on the market can withstand is generally 40%-110%. That is to say, in the one-to-one structure, the amount of hydrogen that the hydrogen purification system needs to process is generally 40%-110% of the rated amount; in the multi-to-one structure, taking 4 electrolytic cells as an example, when all 4 electrolytic cells operate at the highest 110% load, the amount of hydrogen that the hydrogen purification system needs to process is 110% of the rated amount, when all 4 electrolytic cells operate at the lowest 40% load, the amount of hydrogen that the hydrogen purification system needs to process is 40% of the rated amount, and when only 1 electrolytic cell operates at the lowest load of 40%, the amount of hydrogen that the hydrogen purification system needs to process is 10% of the rated amount.

[0073] There are two working modes for the mainstream hydrogen purification systems on the market currently. One is the two-tower switching mode, that is, the hydrogen purification system includes two drying towers. One drying tower is used for hydrogen drying and is in the main working state, called the main drying tower, and the other drying tower is used for the regeneration of molecular sieves in the tower and is in the regeneration state, called the regeneration drying tower. The other is the three-tower switching mode, that is, the hydrogen purification system includes three drying towers. The first drying tower is used for hydrogen drying and is in the main working state, called the main drying tower. The second drying tower is used for the regeneration of molecular sieves in the tower and is in the regeneration working state, called the regeneration drying tower. The third drying tower is used for drying the hydrogen coming out of the regeneration drying tower and is in the secondary working state, called the secondary drying tower. Currently, the three-tower switching mode is the working mode of the mainstream hydrogen purification system.

[0074] Taking the three-tower switching mode as an example below, combined with Figure 1 the structural schematic diagram of the hydrogen purification system shown, the hydrogen purification system and its working mode in the embodiments of the present application will be described in detail.

[0075] As Figure 1 shown, the hydrogen purification system 100 includes three drying towers (the first drying tower 111, the second drying tower 112, and the third drying tower 113 respectively), five gas-water separators (the first gas-water separator 121, the second gas-water separator 122, the third gas-water separator 123, the fourth gas-water separator 124, and the fifth gas-water separator 125 respectively), four condensers (the first condenser 131, the second condenser 132, the third condenser 133, and the fourth condenser 134 respectively), a deoxidation tower 140, and a water collector 150.

[0076] Among them, the first end of the first gas-water separator 121 is connected to the gas (such as hydrogen, nitrogen, gas-liquid mixture, etc.) inlet through a pipeline, the second end is connected to the first end of the deoxidation tower 140 through a pipeline, the second end of the deoxidation tower 140 is connected to the first end of the first condenser 131 through a pipeline, the second end of the first condenser 131 is connected to the first end of the second gas-water separator 122 through a pipeline, and the second end of the second gas-water separator 122 is respectively connected to the first ends of the third gas-water separator 123, the fourth steam-water separator 124, and the fifth gas-water separator 125 through pipelines. The second end of the third gas-water separator 123 is connected to the first end of the second condenser 132 through a pipeline, and the second end of the second condenser 132 is connected to the first end of the first drying tower 111 through a pipeline; the second end of the fourth gas-water separator 124 is connected to the first end of the second condenser 132 through a pipeline, and the second end of the second condenser 132 is connected to the first end of the second drying tower 112 through a pipeline; the second end of the fifth gas-water separator 125 is connected to the first end of the third condenser 133 through a pipeline, and the second end of the third condenser 133 is connected to the first end of the third drying tower 113 through a pipeline. The second ends of the first drying tower 111, the second drying tower 112, and the third drying tower 113 are respectively connected to the gas (such as hydrogen) outlet through the main pipeline and the regeneration pipeline, where the main pipeline and the regeneration pipeline are two parallel pipelines. Any two of the third gas-water separator 123, the fourth gas-water separator 124, and the fifth gas-water separator 125 are connected through pipelines.

[0077] In addition, the third ends of the second gas-water separator 122, the third gas-water separator 123, the fourth gas-water separator 124, and the fifth gas-water separator 125 can also be connected to the first end of the water collector 150 through pipelines, and the second end of the water collector 150 is connected to the sewage outlet through a pipeline; the first condenser 131, the second condenser 132, the third condenser 133, and the fourth condenser 134 can also be respectively connected to the cooling water inlet / outlet ends.

[0078] To achieve the three-tower switching mode, that is, in different working cycles, the working states of the first drying tower 111, the second drying tower 112, and the third drying tower 113 can be switched. A plurality of valves are also provided in the hydrogen purification system 100. By opening and closing each valve, the switching of the working states of the three drying towers is achieved. Specifically, the first valve 1601 is provided on the pipeline between the second gas-water separator 122 and the third gas-water separator 123; the second valve 1602 is provided on the common pipeline between the third gas-water separator 123 and the fourth gas-water separator 124 and the fifth gas-water separator 125 respectively; the third valve 1603 is provided on the pipeline between the second gas-water separator 122 and the fourth gas-water separator 124; the fourth valve 1604 is provided on the common pipeline between the fourth gas-water separator 124 and the third gas-water separator 123 and the fifth gas-water separator 125 respectively; the fifth valve 1605 is provided on the pipeline between the second gas-water separator 122 and the fifth gas-water separator 124; the sixth valve 1606 is provided on the common pipeline between the fifth gas-water separator 125 and the third gas-water separator 123 and the fourth gas-water separator 124 respectively; the seventh valve 1607 is provided on the regeneration pipeline between the first drying tower 111 and the gas outlet; the eighth valve 1608 is provided on the main pipeline between the first drying tower 111 and the gas outlet; the ninth valve 1609 is provided on the regeneration pipeline between the second drying tower 112 and the gas outlet; the tenth valve 1610 is provided on the main pipeline between the second drying tower 112 and the gas outlet; the eleventh valve 1611 is provided on the regeneration pipeline between the third drying tower 113 and the gas outlet; the twelfth valve 1612 is provided on the main pipeline between the third drying tower 113 and the gas outlet.

[0079] It should be noted that Figure 1 The hydrogen purification system 100 shown is only an example. Those skilled in the art can adjust or add or delete each device, each pipeline, each valve, and various connection methods in the hydrogen purification system 100 according to experience or actual situations. For example, increase or decrease the number of devices such as drying towers, pipelines, or valves, adjust the layout of devices such as drying towers, pipelines, or valves, or the connection methods between them. The specific details are not limited.

[0080] Take Figure 1Taking the shown hydrogen purification system 100 as an example, if the first valve 1601, the fourth valve 1604, the sixth valve 1606, the eighth valve 1608, the tenth valve 1610 and the eleventh valve 1611 are controlled to be in the open state, and the second valve 1602, the third valve 1603, the fifth valve 1605, the seventh valve 1607, the ninth valve 1609 and the twelfth valve 1612 are in the closed state, then at this time, the first drying tower 111 is in the main working state as the main drying tower, the second drying tower 112 is in the regeneration working state as the regeneration drying tower, and the third drying tower 113 is in the secondary working state as the secondary drying tower. After the gas (such as hydrogen, nitrogen, gas-liquid mixture, etc.) enters the hydrogen purification system 100 from the gas inlet, there are two gas flow paths:

[0081] Path 1: The first gas-water separator 121 → the deoxidation tower 140 → the first condenser 131 → the second gas-water separator 122 → the third gas-water separator 123 → the second condenser 132 → the first drying tower 111 → the gas outlet.

[0082] Path 2: The first drying tower 111 → the second drying tower 112 → the third condenser 133 → the fourth gas-water separator 124 → the fifth gas-water separator 125 → the fourth condenser 134 → the third drying tower 113 → the gas outlet.

[0083] Specifically, the gas enters the first gas-water separator 121, undergoes gas-liquid separation treatment and then enters the deoxidation tower 140, undergoes deoxidation treatment and then enters the first condenser 132, undergoes heat exchange treatment and then enters the second gas-water separator 122, undergoes gas-liquid separation treatment and then enters the third gas-water separator 123, undergoes gas-liquid separation treatment again and then enters the second condenser 132, undergoes heat exchange treatment and then enters the first drying tower 111, undergoes drying treatment and then is discharged. Most of the gas discharged from the first drying tower 111 is discharged from the main pipeline, and a small part enters the regeneration pipeline.

[0084] The gas coming out of the first drying tower 111 enters the second drying tower 112 through the regeneration pipeline, undergoes drying treatment and then enters the third condenser 133, undergoes heat exchange treatment and then enters the fourth gas-water separator 124, undergoes gas-liquid separation treatment and then enters the fifth gas-water separator 125, undergoes gas-liquid separation treatment again and then enters the fourth condenser 134, undergoes heat exchange treatment and then enters the third drying tower 113, undergoes drying treatment and then is discharged from the regeneration pipeline (or enters the second drying tower 112 again for circulation).

[0085] If the second valve 1602, the fourth valve 1604, the fifth valve 1605, the eighth valve 1608, the ninth valve 1609, and the twelfth valve 1612 are in the open state, and the first valve 1601, the third valve 1603, the sixth valve 1606, the seventh valve 1607, the tenth valve 1610, and the eleventh valve 1611 are in the closed state, then at this time, the first drying tower 111 is in the regeneration working state as the regeneration drying tower, the second drying tower 112 is in the secondary working state as the secondary drying tower, and the third drying tower 113 is in the main working state as the main drying tower. After the gas (such as hydrogen, nitrogen, gas-liquid mixture, etc.) enters the hydrogen purification system 100 from the gas inlet, there are also two gas flow paths:

[0086] Path three: The first gas-water separator 121 → the deoxidation tower 140 → the first condenser 131 → the second gas-water separator 122 → the fifth gas-water separator 125 → the fourth condenser 134 → the third drying tower 113 → the gas outlet.

[0087] Path four: The third drying tower 113 → the first drying tower 111 → the second condenser 132 → the third gas-water separator 123 → the fourth gas-water separator 124 → the third condenser 133 → the second drying tower 112 → the gas outlet.

[0088] For the specific working process, reference can be made to the working process when the first drying tower 111 is the main drying tower, the second drying tower 112 is the regeneration drying tower, and the third drying tower 113 is the secondary drying tower in the above text for adaptive adjustment, which will not be elaborated here.

[0089] If the second valve 1602, the third valve 1603, the sixth valve 1606, the seventh valve 1607, the tenth valve 1610, and the twelfth valve 1612 are in the open state, and the first valve 1601, the fourth valve 1604, the fifth valve 1605, the eighth valve 1608, the ninth valve 1609, and the eleventh valve 1611 are in the closed state, then at this time, the first drying tower 111 is in the secondary working state as the secondary drying tower, the second drying tower 112 is in the main working state as the main drying tower, and the third drying tower 113 is in the regeneration working state as the regeneration drying tower. After the gas (such as hydrogen, nitrogen, gas-liquid mixture, etc.) enters the hydrogen purification system 100 from the gas inlet, there are also two gas flow paths:

[0090] Path five: The first gas-water separator 121 → the deoxidation tower 140 → the first condenser 131 → the second gas-water separator 122 → the fourth gas-water separator 124 → the third condenser 133 → the second drying tower 112 → the gas outlet.

[0091] Path 6: The second drying tower 112 → the third drying tower 113 → the fourth condenser 134 → the fifth gas-water separator 125 → the third gas-water separator 123 → the second condenser 132 → the first drying tower 111 → the gas outlet.

[0092] For the specific working process, reference can be made to the working process when the first drying tower 111 is used as the main drying tower, the second drying tower 112 is used as the regeneration drying tower, and the third drying tower 113 is used as the secondary drying tower in the above text, and corresponding adaptations can be made. Details are not elaborated here.

[0093] In the above working process, both the main drying tower in the main working state and the secondary drying tower in the secondary working state rely on the molecular sieve in the tower for gas drying, and the regeneration drying tower in the regeneration working state needs to carry out regeneration treatment of the molecular sieve in the tower. Among them, the regeneration drying tower includes two stages, namely the heating stage and the cold blow stage, in one working cycle. In the heating stage, the gas entering the regeneration drying tower is heated by the heating wire inside the regeneration drying tower, and then the moisture inside the molecular sieve is carried out by the high-temperature gas. When the regeneration drying tower is completely desorbed (that is, all the moisture inside the molecular sieve is carried out), it enters the cold blow stage; in the cold blow stage, the heating wire inside the regeneration drying tower stops heating, and the temperature is reduced by continuously introducing gas into the regeneration drying tower.

[0094] In the working process of the regeneration drying tower, it is particularly important to reasonably determine the heating duration of the heating stage of the regeneration drying tower. If the heating duration is too short, it will easily lead to incomplete desorption of the molecular sieve in the regeneration drying tower. If the heating time is too long, it will easily cause energy waste. Especially under dynamic working conditions (that is, the input current changes dynamically), the gas flow rate entering the hydrogen purification system 100 fluctuates. If heated according to a fixed duration, it is more likely to cause incomplete desorption of the molecular sieve in the regeneration drying tower and result in energy waste.

[0095] Based on the above problems, the embodiment of the present application provides a hydrogen purification system equipped with a dew point meter, as Figure 2 shown. The hydrogen purification system 100 further includes a first dew point meter 170 and a second dew point meter 180. Among them, the first dew point meter 170 can be connected to the first drying tower 111, the second drying tower 112, and the third drying tower 113 through pipelines respectively, and the on-off between the first dew point meter and each drying tower is controlled by valves. The first dew point meter 170 can be used to obtain the first hydrogen dew point value at the outlet of the regeneration drying tower in the regeneration state. In order to accelerate gas cooling, a condensation ring 190 can also be installed between the first dew point meter 170 and each drying tower.

[0096] The second dew point meter 180 can be installed on the pipeline near the gas outlet for obtaining the second hydrogen dew point value at the outlet of the hydrogen purification system 100.

[0097] It should be noted thatFigure 2 This is only an example of installing a dew point meter. In other possible examples, a first dew point meter can also be configured for each drying tower, and specific details are not limited.

[0098] Based on Figure 2 The hydrogen purification system shown, an embodiment of the present application provides a control method for a regenerative drying tower in a hydrogen purification system. This method can be applied to the hydrogen purification system 100 described above, as Figure 3 shown, is a schematic flow chart corresponding to this method, which specifically includes the following steps:

[0099] Step 301, obtain the first hydrogen dew point value at the outlet of the regenerative drying tower.

[0100] Step 302, according to the first hydrogen dew point value, determine whether the heating stage of the regenerative drying tower meets a preset end condition. If it meets the preset end condition, execute step 303; otherwise, return to step 301.

[0101] Step 303, control the regenerative drying tower to enter the cold blow stage.

[0102] In the present application, the timing of the regenerative drying tower switching from the heating stage to the cold blow stage is determined according to the first hydrogen dew point value. Compared with the prior art method of switching between the heating stage and the cold blow stage according to a fixed cycle, the method provided by the present application is more in line with the actual working conditions of the hydrogen purification system, can effectively avoid the incomplete desorption of molecular sieves in the regenerative drying tower, resulting in energy waste, and thus can improve the regeneration efficiency and meet the needs of the green power fluctuation scenario.

[0103] Specifically, in step 302, there are various ways to determine whether the heating stage of the regenerative drying tower meets the preset end condition. One possible implementation is to compare the first hydrogen dew point value with a preset target hydrogen dew point value. If the first hydrogen dew point value reaches the preset target hydrogen dew point value, it is determined that the heating stage of the regenerative drying tower meets the preset end condition; if the first hydrogen dew point value does not reach the preset target hydrogen dew point value, it is determined that the heating stage of the regenerative drying tower does not meet the preset end condition.

[0104] Another possible implementation is to refer to Figure 4 , which is a schematic flow chart corresponding to a method provided by an embodiment of the present application for determining whether the heating stage of the regenerative drying tower meets the preset end condition, and specifically includes the following steps:

[0105] Step 401, obtain the second hydrogen dew point value at the outlet of the hydrogen purification system.

[0106] Step 402, determine the hydrogen dew point ratio according to the first hydrogen dew point value and the second hydrogen dew point value.

[0107] Among them, the hydrogen dew point ratio can be determined by the following formula (1):

[0108]

[0109] In formula (1), r is the hydrogen dew point ratio; D1 is the first hydrogen dew point value; D2 is the second hydrogen dew point value.

[0110] Step 403: Determine whether the hydrogen dew point ratio is less than or equal to a preset ratio. If the hydrogen dew point ratio is less than or equal to the preset ratio, then execute Step 404; otherwise, return to Step 401.

[0111] Step 404: Compare the first hydrogen dew point value with the first historical hydrogen dew point value obtained at the outlet of the regeneration drying tower at the previous moment. If the first hydrogen dew point value is less than the first historical hydrogen dew point value, then execute Step 405; otherwise, return to Step 401.

[0112] Step 405: Determine that the heating stage of the regeneration drying tower meets the preset end condition.

[0113] It should be noted that the execution order of the above Steps 401 to 405 is only an example. In other possible implementations, Step 404 may also be executed first. If the first hydrogen dew point value is less than the first historical hydrogen dew point value, then execute Step 403. If the hydrogen dew point ratio is less than or equal to the preset ratio, then execute Step 405.

[0114] Based on the same inventive concept, as Figure 5 shown, an embodiment of the present application also discloses a control device for a regeneration drying tower in a hydrogen purification system, which is applied to the hydrogen purification system 100. The hydrogen purification system 100 includes a main drying tower in the main working state and a regeneration drying tower in the regeneration state. The device includes:

[0115] An acquisition unit 501, configured to acquire the first hydrogen dew point value at the outlet of the regeneration drying tower;

[0116] A processing unit 502, configured to determine whether the heating stage of the regeneration drying tower meets the preset end condition according to the first hydrogen dew point value;

[0117] A control unit 503, configured to control the regeneration drying tower to enter the cold blow stage if the preset end condition is satisfied.

[0118] Optionally, the processing unit 502 is specifically configured to:

[0119] Compare the first hydrogen dew point value with a preset target hydrogen dew point value. If the first hydrogen dew point value reaches the preset target hydrogen dew point value, it is determined that the heating stage of the regeneration drying tower meets the preset end condition.

[0120] Optionally, the obtaining unit 501 is further configured to:

[0121] Obtain a second hydrogen dew point value at the outlet of the hydrogen purification system;

[0122] The processing unit 502 is specifically configured to:

[0123] Determine a hydrogen dew point ratio according to the first hydrogen dew point value and the second hydrogen dew point value;

[0124] Judge whether the hydrogen dew point ratio is less than or equal to a preset ratio. If the hydrogen dew point ratio is less than or equal to the preset ratio, it is determined that the heating stage of the regeneration drying tower meets the preset end condition.

[0125] Optionally, the processing unit 502 is further configured to:

[0126] Compare the first hydrogen dew point value with the first historical hydrogen dew point value obtained at the outlet of the regeneration drying tower at the previous moment; if the first hydrogen dew point value is less than the first historical hydrogen dew point value, it is determined that the heating stage of the regeneration drying tower meets the preset end condition.

[0127] Optionally, the hydrogen dew point ratio is determined by the following method:

[0128]

[0129] where r is the hydrogen dew point ratio; D1 is the first hydrogen dew point value; D2 is the second hydrogen dew point value.

[0130] Based on the same inventive concept, the present application discloses a hydrogen purification system, which includes a main drying tower in the main working state and a regeneration drying tower in the regeneration state. The system further includes:

[0131] A first dew point meter configured to obtain a first hydrogen dew point value at the outlet of the regeneration drying tower;

[0132] A controller configured to judge whether the heating stage of the regeneration drying tower meets a preset end condition according to the first hydrogen dew point value; if the preset end condition is met, control the regeneration drying tower to enter the cold blow stage.

[0133] Optionally, the controller is specifically configured to:

[0134] Compare the first hydrogen dew point value with a preset target hydrogen dew point value. If the first hydrogen dew point value reaches the preset target hydrogen dew point value, it is determined that the heating stage of the regeneration drying tower meets the preset end condition.

[0135] Optionally, the system further includes:

[0136] A second dew point meter configured to obtain a second hydrogen dew point value at the outlet of the hydrogen purification system;

[0137] The controller is specifically configured to:

[0138] Determine a hydrogen dew point ratio based on the first hydrogen dew point value and the second hydrogen dew point value;

[0139] Judge whether the hydrogen dew point ratio is less than or equal to a preset ratio. If the hydrogen dew point ratio is less than or equal to the preset ratio, it is determined that the heating stage of the regeneration drying tower meets the preset end condition.

[0140] Optionally, the controller is specifically configured to:

[0141] Compare the first hydrogen dew point value with the first historical hydrogen dew point value obtained at the outlet of the regeneration drying tower at the previous moment; if the first hydrogen dew point value is less than the first historical hydrogen dew point value, it is determined that the heating stage of the regeneration drying tower meets the preset end condition.

[0142] Optionally, the hydrogen dew point ratio is determined by the following method:

[0143]

[0144] Where r is the hydrogen dew point ratio; D1 is the first hydrogen dew point value; D2 is the second hydrogen dew point value.

[0145] Based on the same inventive concept, an embodiment of the present application also discloses a terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the method described above is implemented.

[0146] Based on the same inventive concept, an embodiment of the present application also discloses a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, the method described above is implemented.

[0147] Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems, or computer program products. The systems, devices, modules, or units described in the above embodiments can be specifically implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer device. Specifically, the computer device can be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or any combination of these devices.

[0148] In a typical example, the computer device specifically includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, it implements the method executed by the client as described above, or when the processor executes the program, it implements the method executed by the server as described above.

[0149] The computer device includes a central processing unit (CPU), which can perform various appropriate operations and processes according to the program stored in the read-only memory (ROM) or the program loaded from the storage part into the random access memory (RAM). In the RAM, various programs and data required for system operation are also stored. The CPU, ROM, and RAM are connected to each other via a bus. The input / output (I / O) interface is also connected to the bus.

[0150] The following components are connected to the I / O interface: an input part including a keyboard, a mouse, etc.; an output part including a cathode ray tube (CRT), a liquid crystal display (LCD), etc. and a speaker, etc.; a storage part including a hard disk, etc.; and a communication part including a network interface card such as a LAN card, a modem, etc. The communication part performs communication processing via a network such as the Internet. A drive is also connected to the I / O interface as needed. A removable medium, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive as needed so that the computer program read from it can be installed in the storage part as needed.

[0151] Specifically, according to the embodiments of the present application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, the embodiments of the present application include a computer program product, which includes a computer program tangibly embodied on a machine-readable medium. The computer program includes program code for performing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from the network through the communication part, and / or installed from the removable medium.

[0152] A computer-readable medium includes both permanent and non-permanent, removable and non-removable media that can store information by any method or technology. The information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer-readable medium does not include transitory computer-readable media such as modulated data signals and carrier waves.

[0153] For the convenience of description, when describing the above devices, they are divided into various units according to their functions and described separately. Of course, when implementing the present application, the functions of each unit can be implemented in the same or multiple software and / or hardware.

[0154] This application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one or more of the flows Figure 1 or blocks.

[0155] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means that implement the functions specified in Figure 1 one or more of the flows Figure 1 or blocks.

[0156] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one process Figure 1 one process or multiple processes and / or blocks Figure 1 steps for the functions specified in one block or multiple blocks.

[0157] It should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, commodity or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or also elements inherent to such process, method, commodity or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, commodity or device comprising the said element.

[0158] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0159] The present application can be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. The present application can also be practiced in a distributed computing environment where tasks are performed by remote processing devices connected through a communication network. In a distributed computing environment, program modules can be located in local and remote computer storage media including storage devices.

[0160] Each embodiment in this specification is described in a progressive manner. The same or similar parts among the embodiments can be referred to each other, and the key point of each embodiment is to illustrate the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method embodiment.

[0161] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A control method for a regeneration drying tower in a hydrogen purification system, characterized in that, The method is applied to the hydrogen purification system, which includes a main drying tower in the main working state and a regenerative drying tower in the regeneration state. The method includes: Obtaining a first hydrogen dew point value at the outlet of the regenerative drying tower; Judging whether the heating stage of the regenerative drying tower meets a preset end condition according to the first hydrogen dew point value; If the preset end condition is met, controlling the regenerative drying tower to enter the cold blow stage.

2. The control method according to claim 1, characterized in that Judging whether the heating stage of the regenerative drying tower meets a preset end condition according to the first hydrogen dew point value, including: Comparing the first hydrogen dew point value with a preset target hydrogen dew point value. If the first hydrogen dew point value reaches the preset target hydrogen dew point value, it is determined that the heating stage of the regenerative drying tower meets the preset end condition.

3. The control method according to claim 1, characterized in that The method further includes: Obtaining a second hydrogen dew point value at the outlet of the hydrogen purification system; Judging whether the heating stage of the regenerative drying tower meets a preset end condition according to the first hydrogen dew point value, including: Determining a hydrogen dew point ratio according to the first hydrogen dew point value and the second hydrogen dew point value; Judging whether the hydrogen dew point ratio is less than or equal to a preset ratio. If the hydrogen dew point ratio is less than or equal to the preset ratio, it is determined that the heating stage of the regenerative drying tower meets the preset end condition.

4. The control method according to claim 3, wherein Before determining that the heating stage of the regenerative drying tower meets the preset end condition, the method further includes: Comparing the first hydrogen dew point value with a first historical hydrogen dew point value obtained at the outlet of the regenerative drying tower at the previous moment; If the first hydrogen dew point value is less than the first historical hydrogen dew point value, it is determined that the heating stage of the regenerative drying tower meets the preset end condition.

5. The control method according to claim 3, wherein The hydrogen dew point ratio is determined by the following method: Where r is the hydrogen dew point ratio; D1 is the first hydrogen dew point value; D2 is the second hydrogen dew point value.

6. A control device for a regeneration drying tower in a hydrogen purification system, characterized in that, The device is applied to the hydrogen purification system, which includes a main drying tower in the main working state and a regenerative drying tower in the regeneration state. The device includes: An acquisition unit for obtaining a first hydrogen dew point value at the outlet of the regenerative drying tower; A processing unit for judging whether the heating stage of the regenerative drying tower meets a preset end condition according to the first hydrogen dew point value; A control unit for controlling the regenerative drying tower to enter the cold blow stage if the preset end condition is met.

7. The control device according to claim 6, characterized in that, The acquisition unit is further configured to: Obtain a second hydrogen dew point value at the outlet of the hydrogen purification system; The processing unit is specifically configured to: Determine a hydrogen dew point ratio according to the first hydrogen dew point value and the second hydrogen dew point value; Judge whether the hydrogen dew point ratio is less than or equal to a preset ratio. If the hydrogen dew point ratio is less than or equal to the preset ratio, it is determined that the heating stage of the regenerative drying tower meets the preset end condition.

8. A hydrogen purification system, characterized in that, The hydrogen purification system includes a main drying tower in the main working state and a regenerative drying tower in the regeneration state. The system further includes: A first dew point meter configured to obtain a first hydrogen dew point value at the outlet of the regenerative drying tower; The controller is configured to determine whether a heating stage of the regeneration drying tower meets a preset end condition according to the first hydrogen dew point value; if the preset end condition is met, the controller controls the regeneration drying tower to enter a cold blow stage.

9. A terminal device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, the method according to any one of claims 1 to 5 is implemented.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, the method according to any one of claims 1 to 5 is implemented.

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