CN115709971B

CN115709971B - Hydrogen purification system and control method

Info

Publication number: CN115709971B
Application number: CN202310025296.1A
Authority: CN
Inventors: 毕俊; 王禹陶; 赵志丹; 马莉
Original assignee: Changchun Lvdong Hydrogen Energy Technology Co ltd
Current assignee: Changchun Lvdong Hydrogen Energy Technology Co ltd
Priority date: 2023-01-09
Filing date: 2023-01-09
Publication date: 2023-04-28
Anticipated expiration: 2043-01-09
Also published as: CN115709971A

Abstract

The invention relates to the technical field of hydrogen purification, and particularly provides a hydrogen purification system and a control method. The hydrogen purification system can enable the first drying device, the second drying device and the third drying device to be respectively in a drying state, an auxiliary state and a regeneration state in the same time through opening and closing the corresponding valves, and when the drying device in the drying state operates, the drying device in the auxiliary state and the regeneration state can be in standby, so that the hydrogen purification system can be suitable for electrolytic water hydrogen production equipment with fluctuation or intermittence of hydrogen yield.

Description

Hydrogen purification system and control method

Technical Field

The invention relates to the technical field of hydrogen purification, in particular to a hydrogen purification system and a control method.

Background

The hydrogen purification system is used for connecting the electrolytic water hydrogen production equipment to dehydrate and purify the hydrogen prepared by the electrolytic water hydrogen production equipment. In the related art, the hydrogen purification system comprises a hydrogen pre-drying tower, a hydrogen first drying tower and a hydrogen second drying tower, wherein the hydrogen first drying tower and the hydrogen second drying tower can alternately perform drying and purification, and the hydrogen pre-drying tower can regenerate a molecular sieve in one drying tower for stopping drying and purification, so that the hydrogen purification is continuously performed. However, the hydrogen purification system in the related art needs to allow hydrogen prepared by the water electrolysis hydrogen production equipment to enter at a constant and uninterrupted flow, and when the water electrolysis hydrogen production equipment adopts renewable energy sources, for example, photovoltaic energy sources to carry out water electrolysis hydrogen production, the flow fluctuation and even the intermittence of the hydrogen prepared by the water electrolysis hydrogen production equipment exist, so that the hydrogen purification system in the related art cannot be applied.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems in the related art to some extent. To this end, embodiments of the present invention provide a hydrogen purification system with an adjustable hydrogen demand to accommodate a water electrolysis hydrogen production plant with a fluctuating or intermittent hydrogen production.

The embodiment of the invention also provides a control method of the hydrogen purification system.

The hydrogen purification system comprises an air inlet component, a regeneration state switching pipeline, a first drying device, a second drying device and a third drying device, wherein the air inlet component is provided with a first branch and a second branch, and the regeneration state switching pipeline comprises a first valve and a heater which are connected in series, and a second valve which is connected in parallel with the first valve and the heater;

each of the first, second and third drying devices includes:

a drying tower;

the drying air inlet valve is connected with the drying tower and the first branch and used for controlling the on-off of the first branch and the drying tower;

the drying exhaust valve is connected with the drying tower and is used for exhausting the hydrogen gas dried by the drying tower;

the auxiliary air inlet valve is connected with the drying tower and the second branch and used for controlling the on-off of the second branch and the drying tower;

the auxiliary exhaust valve is connected with the drying tower and the air inlet end of the regeneration state switching pipeline and is used for controlling the on-off of the drying tower and the regeneration state switching pipeline;

The regeneration air inlet valve is connected with the drying tower and the air outlet end of the regeneration state switching pipeline and is used for controlling the on-off of the regeneration state switching pipeline and the drying tower;

and the regeneration exhaust valve is connected with the drying tower and the air inlet assembly and is used for controlling the on-off of the drying tower and the air inlet assembly, and the regeneration exhaust valve is positioned at the upstream of the drying air inlet valve.

The hydrogen purification system provided by the embodiment of the invention can enable the first drying device, the second drying device and the third drying device to be respectively in a drying state, an auxiliary state and a regeneration state in the same time through opening and closing the corresponding valves, can adjust a specific stage of the regeneration state through the regeneration state switching pipeline, and can be standby by the drying devices in the auxiliary state and the regeneration state when the drying devices in the drying state are operated, so that the hydrogen purification system provided by the embodiment of the invention can be suitable for electrolytic water hydrogen production equipment with fluctuation or intermittence in hydrogen yield.

In some embodiments, each of the first, second, and third drying devices has a dry state in which hydrogen enters the drying column from the drying intake valve and is discharged from the drying exhaust valve, an auxiliary state in which hydrogen enters the drying column from the auxiliary intake valve and is discharged from the auxiliary exhaust valve, and a regeneration state in which hydrogen enters the drying column from the regeneration intake valve and is discharged from the regeneration exhaust valve,

Wherein one of the first drying device, the second drying device and the third drying device is in the dry state,

another one of the first drying device, the second drying device and the third drying device is in the auxiliary state, and the remaining one is in the regeneration state; or alternatively

Another one and the remaining one of the first drying device, the second drying device and the third drying device are all in a standby state.

In some embodiments, the regeneration state includes a heating regeneration phase in which the first valve is open and the second valve is closed, and a cool-air regeneration phase in which the first valve is closed and the second valve is open.

In some embodiments, the hydrogen purification system further comprises a circulation pipeline, an air inlet end of the circulation pipeline is communicated with the regeneration exhaust valve, an air outlet end of the circulation pipeline is communicated with the air inlet assembly, and the circulation pipeline is provided with a first cooler and a first gas-water separator which are sequentially arranged, wherein the first gas-water separator is used for separating gas and liquid in the circulation pipeline.

In some embodiments, the hydrogen purification system further comprises a first heat exchanger in communication with the circulation line and downstream of the first heat exchanger in communication with the regeneration status switching line and downstream of the first valve, the first heat exchanger being configured to exchange heat with the medium in the circulation line and the medium in the regeneration status switching line.

In some embodiments, the air intake assembly includes a dry air intake pipe in communication with the first branch and the dry air intake valve to provide hydrogen to the drying tower through the dry air intake valve, and an auxiliary air intake pipe in communication with the second branch and the auxiliary air intake valve to provide hydrogen to the drying tower through the auxiliary air intake valve, and a regeneration exhaust valve in communication with the dry air intake pipe for feeding hydrogen exhausted from the drying tower into the dry air intake pipe.

In some embodiments, the inlet end of the dry air inlet pipe is provided with a regulating valve, and the inlet end of the auxiliary air inlet pipe is provided with a flowmeter.

In some embodiments, the hydrogen purification system further comprises a gas outlet assembly and a hydrogen compensation tube, the gas outlet assembly comprising:

The inlet end of the air outlet pipe is communicated with the drying exhaust valve and is used for receiving the hydrogen exhausted after the drying tower is dried;

the compressor is communicated with the air outlet pipe and used for compressing the hydrogen exhausted by the air outlet pipe; and

the storage device is communicated with the compressor and is used for receiving and storing the hydrogen compressed by the compressor;

the hydrogen compensation pipe is communicated with the storage device and the auxiliary air inlet pipe and is used for supplementing hydrogen in the storage device to the auxiliary air inlet pipe.

In some embodiments, the air outlet pipe is provided with an instrument air outlet, a pure air outlet, an exhaust gas outlet and a switch valve corresponding to the pure air outlet and the exhaust gas outlet respectively, the compressor is communicated with the pure air outlet, the instrument air outlet is suitable for being connected with a detection instrument to detect that the hydrogen discharged by the air outlet pipe is pure air or exhaust gas, when the hydrogen discharged by the air outlet pipe is pure air, the hydrogen discharged by the air outlet pipe is discharged to the compressor through the pure air outlet, and when the hydrogen discharged by the air outlet pipe is exhaust gas, the hydrogen discharged by the air outlet pipe is released through the exhaust gas outlet.

In some embodiments, the air intake assembly further comprises a second air-water separator, a second cooler, and a third air-water separator in communication in sequence, the inlet end of the second air-water separator being adapted to communicate with an electrolyzed water hydrogen plant, the outlet end of the third air-water separator communicating with the dry air intake duct and the auxiliary air intake duct.

In some embodiments, the air intake assembly further comprises a second heat exchanger and a deoxygenator, an inlet end of the deoxygenator being in communication with the third gas-water separator through the second heat exchanger such that medium exiting the third gas-water separator is fed to the deoxygenator, and both the dry air intake pipe and the auxiliary air intake pipe are in communication with an outlet end of the deoxygenator through the second heat exchanger such that medium exiting the deoxygenator is fed to the dry air intake pipe and the auxiliary air intake pipe, the second heat exchanger being for heat exchange with medium fed to the deoxygenator and medium exiting the deoxygenator.

In some embodiments, the air intake assembly further comprises a third cooler and a fourth air-water separator in communication in sequence, the second heat exchanger is in communication with the third cooler, and the fourth air-water separator is in communication with the dry air intake pipe and the auxiliary air intake pipe.

The control method of the hydrogen purification system according to the embodiment of the present invention is based on the hydrogen purification system according to any one of the above embodiments, and includes:

controlling the drying intake valve and the drying exhaust valve of the first drying device to open to be in a drying state, the regeneration intake valve and the regeneration exhaust valve of the second drying device to open to be in a regeneration state, and the auxiliary intake valve and the auxiliary exhaust valve of the third drying device to open to be in an auxiliary state for a T1 time;

Controlling the drying intake valve and the drying exhaust valve of the first drying device to open to be in a drying state, the regeneration intake valve and the regeneration exhaust valve of the second drying device to be turned off to be in a standby state, and the auxiliary intake valve and the auxiliary exhaust valve of the third drying device to be turned off to be in a standby state for a T2 time;

controlling the auxiliary intake valve and the auxiliary exhaust valve of the first drying device to be opened to be in an auxiliary state, the drying intake valve and the drying exhaust valve of the second drying device to be opened to be in a drying state, and the regeneration intake valve and the regeneration exhaust valve of the third drying device to be opened to be in a regeneration state for a T1 time;

controlling the auxiliary intake valve and the auxiliary exhaust valve of the first drying device to be turned off to be in a standby state, the drying intake valve and the drying exhaust valve of the second drying device to be opened to be in a drying state, and the regeneration intake valve and the regeneration exhaust valve of the third drying device to be turned off to be in a standby state for a T2 time;

Controlling the regeneration intake valve and the regeneration exhaust valve of the first drying device to open to be in a regeneration state, the auxiliary intake valve and the auxiliary exhaust valve of the second drying device to open to be in an auxiliary state, and the drying intake valve and the drying exhaust valve of the third drying device to open to be in a drying state for a T1 time;

controlling the regeneration intake valve and the regeneration exhaust valve of the first drying device to be turned off to be in a standby state, the auxiliary intake valve and the auxiliary exhaust valve of the second drying device to be turned off to be in a standby state, and the drying intake valve and the drying exhaust valve of the third drying device to be opened to be in a drying state for a T2 time;

wherein T1 and T2 are constants greater than 0, respectively, and T1 is greater than T2.

According to the control method of the hydrogen purification system, the first drying device, the second drying device and the third drying device are respectively in the drying state, the auxiliary state and the regeneration state at the same time, and when the drying devices in the drying state operate, the drying devices in the auxiliary state and the regeneration state can be standby, so that the hydrogen production equipment with fluctuation or intermittence in cooperation with the hydrogen production can be realized.

In some embodiments, during the T1 time,

in the period of 0-t 1, controlling the first valve to be opened and the second valve to be closed so as to enable the drying device in the regeneration state to be in the heating regeneration stage, and introducing 50% or less of hydrogen production amount of the water electrolysis hydrogen production equipment into the drying device in the regeneration state;

in the time period of t 1-t 2, controlling the first valve to be opened and the second valve to be closed, so that the drying device in the regeneration state is in the heating regeneration stage, and more than 50% of hydrogen production amount of the water electrolysis hydrogen production equipment is introduced into the drying device in the regeneration state;

in the time period of t 2-t 3, controlling the first valve to be closed and the second valve to be opened, so that the drying device in the regeneration state is in the cold blowing regeneration stage, and more than 50% of hydrogen production amount of the electrolytic water hydrogen production equipment is introduced into the drying device in the regeneration state;

in the time period of t 3-t 4, controlling the first valve to be closed and the second valve to be opened so that the drying device in the regeneration state is in the cold blowing regeneration stage, and introducing 50% or less of the hydrogen production amount of the electrolytic water hydrogen production equipment into the drying device in the regeneration state;

Wherein t1, t2, t3 and t4 are constants greater than 0, respectively.

In some embodiments, t1=t4-t 3, t2-t1=t3-t 2, t1 < t2-t1, t2+.gtoreq.t4/2.

In some embodiments, when the first drying device is in the T1 time of the drying state+the T2 time, or when the second drying device is in the T1 time of the drying state+the T2 time of the drying state, or when the third drying device is in the T1 time of the drying state+the T2 time of the drying device, the accumulated operation time length of the drying device in the drying state before the last interruption after the last switching to the drying state is denoted as T0, the uninterrupted operation time length of the drying device of the hydrogen purification system before the last interruption is denoted as T0, and T0 are constants greater than 0, respectively;

when T0 is smaller than T1/2 and T0 is smaller than T1/2, the hydrogen purification system directly enters into a stop state or is restarted, wherein

The drying device in the drying state before the last interruption re-enters the drying state after the hydrogen purification system is restarted for a period of time T1+ T2-T0, or re-enters the drying state and enters a shutdown state after a period of time T1;

The drying device in the auxiliary state before the last interruption re-enters the auxiliary state after the hydrogen purification system is restarted and enters a stop state or standby time T2-T0 after lasting for T1 time;

the drying device in the regeneration state before the last interruption re-enters the regeneration state after the hydrogen purification system is restarted and enters a stop state or standby time T2-T0 after lasting for T1 time;

when T0 is greater than or equal to T1/2 and T0 is less than T3,

the storage device supplies hydrogen to the auxiliary air inlet pipe after the hydrogen purification system is restarted, so that the drying device in the regeneration state before the last interruption continues to perform the regeneration state before the last interruption for t5 time, and when t5+t0=t3, the drying device in the regeneration state before the last interruption enters the drying state and then enters a shutdown state, wherein t5 is a constant greater than 0;

when T0 is greater than or equal to T1/2 and T0 is greater than or equal to T3, the hydrogen purification system directly enters a shutdown state or is restarted, wherein

The drying device in the regeneration state before the last interruption enters the drying state after the hydrogen purification system is restarted.

Drawings

FIG. 1 is a schematic diagram of a hydrogen purification system according to an embodiment of the present invention;

FIG. 2 is a schematic diagram showing the use of the hydrogen purification system according to the embodiment of the present invention;

FIG. 3 is a second schematic diagram of the hydrogen purification system according to an embodiment of the present invention;

FIG. 4 is a third schematic illustration of the use of the hydrogen purification system according to an embodiment of the present invention;

FIG. 5 is a schematic diagram showing a use state of the hydrogen purification system according to the embodiment of the present invention;

FIG. 6 is a schematic diagram showing a use state of the hydrogen purification system according to the embodiment of the present invention;

FIG. 7 is a schematic diagram showing a use state of the hydrogen purification system according to the embodiment of the present invention;

FIG. 8 is a schematic diagram of a hydrogen purification system according to an embodiment of the present invention.

Reference numerals:

1. an air intake assembly; 11. drying the air inlet pipe; 12. an auxiliary air inlet pipe; 13. a second gas-water separator; 14. a second cooler; 15. a third gas-water separator; 16. a second heat exchanger; 17. a deoxidizer; 18. a third cooler; 19. a fourth gas-water separator; 2. a regeneration state switching pipeline; 21. a first valve; 22. a heater; 23. a second valve; 3. a first drying device; 31. a drying tower; 32. drying the air inlet valve; 33. drying the exhaust valve; 34. an auxiliary intake valve; 35. an auxiliary exhaust valve; 36. regenerating an air inlet valve; 37. regenerating an exhaust valve; 4. a second drying device; 5. a third drying device; 6. a circulation line; 61. a first cooler; 62. a first gas-water separator; 7. a first heat exchanger; 8. an air outlet assembly; 81. an air outlet pipe; 811. an instrument air outlet; 812. an exhaust gas outlet; 82. a compressor; 83. a storage device; 9. a hydrogen compensation tube; 100. an electrolytic water hydrogen production device.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.

A hydrogen purification system and a control method according to an embodiment of the invention are described below with reference to fig. 1 to 8.

As shown in fig. 1 to 8, the hydrogen purification system according to the embodiment of the present invention includes an intake assembly 1, a regeneration state switching pipe 2, a first drying device 3, a second drying device 4, and a third drying device 5. The intake assembly 1 has a first branch and a second branch, and the regeneration-state switching line 2 includes a first valve 21 and a heater 22 connected in series, and a second valve 23 connected in parallel with both the first valve 21 and the heater 22.

Each of the first drying device 3, the second drying device 4, and the third drying device 5 includes a drying tower 31, a drying intake valve 32, a drying exhaust valve 33, an auxiliary intake valve 34, an auxiliary exhaust valve 35, a regeneration intake valve 36, and a regeneration exhaust valve 37, the drying intake valve 32 is connected to the drying tower 31 and the first branch for controlling the on-off of the first branch and the drying tower 31, the drying exhaust valve 33 is connected to the drying tower 31 for exhausting the hydrogen gas dried by the drying tower 31, the auxiliary intake valve 34 is connected to the drying tower 31 and the second branch for controlling the on-off of the second branch and the drying tower 31, the auxiliary exhaust valve 35 is connected to the air intake ends of the drying tower 31 and the regeneration state switching pipe 2 for controlling the on-off of the drying tower 31 and the regeneration state switching pipe 2, the regeneration intake valve 36 is connected to the air outlet ends of the drying tower 31 and the regeneration state switching pipe 2 for controlling the on-off of the regeneration state switching pipe 2 and the drying tower 31, the regeneration exhaust valve 37 is connected to the drying tower 31 and the air intake assembly 1 for controlling the on-off of the drying tower 31 and the air intake assembly 1, and the regeneration exhaust valve 37 is located upstream of the drying intake valve 32.

Specifically, as shown in fig. 1, the air inlet assembly 1 is used for supplying hydrogen to the first drying device 3, the second drying device 4 and the third drying device 5, preferably, the inlet end of the air inlet assembly 1 is connected to the electrolytic water hydrogen production apparatus 100, and more preferably, the inlet end of the air inlet assembly 1 is connected to the electrolytic water hydrogen production apparatus 100 using a photovoltaic energy source, so as to purify the hydrogen produced by the electrolytic water hydrogen production apparatus 100 using the photovoltaic energy source. The drying air inlet valve 32, the drying air outlet valve 33, the auxiliary air inlet valve 34, the auxiliary air outlet valve 35, the regeneration air inlet valve 36 and the regeneration air outlet valve 37 are all arranged adjacent to the drying tower 31 and are arranged on the drying tower 31 through corresponding pipelines to regulate and control hydrogen entering the drying tower 31 to go to and out of the drying tower 31, wherein the drying air inlet valve 32 is communicated with a first branch of the air inlet assembly 1, and the auxiliary air inlet valve 34 is communicated with a second branch of the air inlet assembly 1.

When hydrogen enters the drying tower 31 from the drying air inlet valve 32 and is discharged from the drying air outlet valve 33, the drying tower 31 is in a drying state for drying and purifying the hydrogen supplied by the electrolytic water hydrogen production device 100, when hydrogen enters the drying tower 31 from the regeneration air inlet valve 36 and is discharged from the regeneration air outlet valve 37, the drying tower 31 is in a regeneration state, so that the drying tower 31 can enter the drying state after regeneration and is replaced by the drying tower 31 in the drying state for drying and purifying, the exhaust gas of the drying tower 31 in the regeneration state is sent to the air inlet assembly 1 through the regeneration air outlet valve 37, then enters the drying tower 31 in the drying state through the drying air inlet valve 32 for purifying, and when hydrogen enters the drying tower 31 from the auxiliary air inlet valve 34 and is discharged from the auxiliary air outlet valve 35, the drying tower 31 is in an auxiliary state for drying part of the hydrogen, and the dried part of the hydrogen is introduced into the drying tower 31 in the regeneration state through the regeneration state switching pipeline 2 to ensure that the drying tower 31 can complete regeneration.

The hydrogen purification system provided by the embodiment of the invention can enable the first drying device, the second drying device and the third drying device to be respectively in a drying state, an auxiliary state and a regeneration state in the same time through the opening and closing of the corresponding valves, and can adjust the specific stage of the regeneration state through the regeneration state switching pipeline, so that the corresponding drying towers can complete regeneration, and after the regeneration state is finished, the drying devices in the drying state are operated through the opening and closing of the corresponding valves, and the drying devices in the auxiliary state and the regeneration state are standby, so that the hydrogen purification system provided by the embodiment of the invention can be suitable for electrolytic water hydrogen production equipment with fluctuation or intermittence in hydrogen yield.

In some embodiments, each of the first drying device 3, the second drying device 4, and the third drying device 5 has a drying state in which hydrogen gas enters the drying tower 31 from the drying intake valve 32 and is discharged from the drying exhaust valve 33, an auxiliary state in which hydrogen gas enters the drying tower 31 from the auxiliary intake valve 34 and is discharged from the auxiliary exhaust valve 35, and a regeneration state in which hydrogen gas enters the drying tower 31 from the regeneration intake valve 36 and is discharged from the regeneration exhaust valve 37, wherein one of the first drying device 3, the second drying device 4, and the third drying device 5 is in the drying state, the other of the first drying device 3, the second drying device 4, and the third drying device 5 is in the auxiliary state, and the remaining one is in the regeneration state; or another one and the remaining one of the first drying device 3, the second drying device 4 and the third drying device 5 are in a standby state.

As shown in fig. 2, the first drying device 3 is in a drying state, the second drying device 4 is in a regeneration state, the third drying device 5 is in an auxiliary state, a part of hydrogen prepared by the electrolytic water hydrogen production equipment 100 is introduced into the first drying device 3 for drying and purification, another part of hydrogen prepared by the electrolytic water hydrogen production equipment 100 firstly enters the third drying device 5 for drying, then enters the second drying device 4 for regeneration, finally enters the first drying device 3 for drying and purification, the second drying device 4 is regenerated with the aid of the third drying device 5, and all hydrogen prepared by the electrolytic water hydrogen production equipment 100 is dried and purified in the first drying device 3.

As shown in fig. 3, the first drying device 3 is in a dry state, and the second drying device 4 and the third drying device 5 are in a standby state. All hydrogen produced by the electrolytic water hydrogen production device 100 at this time synchronously enters the first drying device 3 for drying and purification without passing through the second drying device 4 and the third drying device 5.

As shown in fig. 4, the second drying device 4 is in a dry state, the first drying device 3 is in an auxiliary state, and the third drying device 5 is in a regenerated state.

As shown in fig. 5, the second drying device 4 is in a dry state, and the first drying device 3 and the third drying device 5 are in a standby state.

As shown in fig. 6, the third drying device 5 is in a dry state, the first drying device 3 is in a regenerated state, and the second drying device 4 is in an auxiliary state.

As shown in fig. 7, the third drying device 5 is in a dry state, and the first drying device 3 and the second drying device 4 are in a standby state.

Preferably, the hydrogen purification system is operated in the conditions shown in fig. 2, 3, 4, 5, 6 and 7, and is operated in a cyclic manner, and the duration of the conditions shown in each figure is adjustable to accommodate the volatility and intermittence of hydrogen produced by the water electrolysis hydrogen plant 100.

It will be appreciated that in other embodiments, depending on the volatility of the hydrogen produced by the electrolyzed water hydrogen apparatus 100, the hydrogen purification system may be operated in a loop as shown in fig. 2, 4, 6, and 7, or in a loop as shown in fig. 2, 3, 4, and 6, or in a loop as shown in fig. 7.

In some embodiments, the regeneration state includes a heating regeneration phase in which the first valve 21 is open and the second valve 23 is closed, and a cool-air regeneration phase in which the first valve 21 is closed and the second valve 23 is open.

As shown in fig. 1, the regeneration state switching line 2 includes a first valve 21 and a heater 22, and a second valve 23 connected in parallel with both the first valve 21 and the heater 22, when the first valve 21 is opened and the second valve 23 is closed, the dry hydrogen gas discharged from the auxiliary exhaust valve 35 reaches 180 ℃ to 280 ℃ after passing through the heater 22, and then is introduced into the drying tower 31 in a regeneration state, so that the drying tower 31 in a regeneration state is in a heating regeneration stage, and when one valve 21 is closed and the second valve 23 is opened, the dry hydrogen gas discharged from the auxiliary exhaust valve 35 does not pass through the heater 22, so that the hydrogen gas is introduced into the drying tower 31 in a regeneration state at the temperature of the auxiliary state drying tower outlet, so that the drying tower 31 in a regeneration state is in a cooling regeneration stage, the drying tower 31 in a regeneration state is first in a heating regeneration stage, and then in a cooling regeneration stage, thereby completing the regeneration.

It will be appreciated that when the drying tower in the regeneration state is in the heating regeneration stage and the electrolyzed water hydrogen production plant is interrupted, the drying tower is also interrupted and does not enter the cold blowing regeneration stage, and after restarting, the drying tower in the regeneration state continues to perform heating regeneration or stops running, so that the drying tower in the regeneration state only has the heating regeneration stage before interruption.

In some embodiments, the hydrogen purification system according to the embodiments of the present invention further includes a circulation pipeline 6, an air inlet end of the circulation pipeline 6 is communicated with the regeneration vent valve 37, an air outlet end of the circulation pipeline 6 is communicated with the air inlet assembly 1, a first cooler 61 and a first gas-water separator 62 are sequentially arranged on the circulation pipeline 6, and the first gas-water separator 62 is used for separating gas and liquid in the circulation pipeline 6.

As shown in fig. 1, the circulation pipeline 6 is configured to receive the hydrogen discharged from the regeneration vent valve 37 and supply the hydrogen into the air intake assembly 1, so that the hydrogen discharged from the regeneration vent valve 37 enters a drying device in a dry state for drying and purifying, a first cooler 61 and a first gas-water separator 62 are sequentially arranged on the circulation pipeline 6 along the flow direction of the hydrogen, the first cooler 61 is configured to cool the hydrogen in the circulation pipeline 6 to 10 ℃ to 20 ℃ so as to meet the requirement of the air intake temperature of the drying operation of the drying tower 31 in the dry state, and the first gas-water separator 62 is configured to separate the gas from the liquid in the circulation pipeline 6 and discharge the liquid, thereby reducing the drying load of the drying operation of the drying tower 31 in the dry state.

In some embodiments, the hydrogen purification system according to the embodiments of the present invention further includes a first heat exchanger 7, where the first heat exchanger 7 is in communication with the circulation line 6, and the first cooler 61 is located downstream of the first heat exchanger 7, where the first heat exchanger 7 is in communication with the regeneration-state switching line 2 and downstream of the first valve 21, and where the first heat exchanger 7 is configured to exchange heat between the medium in the circulation line 6 and the medium in the regeneration-state switching line 2.

As shown in fig. 1, the first heat exchanger 7 is respectively communicated with the circulation line 6 and the regeneration state switching line 2, a first medium line communicated with the circulation line 6 and a second medium line communicated with the regeneration state switching line 2 are arranged in the first heat exchanger 7, and the medium in the circulation line 6 and the medium in the regeneration state switching line 2 are subjected to heat exchange through the first medium line and the second medium line, and when the drying tower 31 in the regeneration state is in a heating regeneration stage, the temperature of the medium entering the circulation line 6 is higher than the temperature of the medium entering the regeneration state switching line 2 because the hydrogen entering the drying tower 31 in the regeneration state is in a hot gas state, the medium in the circulation line 6 can be cooled after passing through the first heat exchanger 7, and the medium in the regeneration state switching line 2 can be heated, so that the power consumption of the heater 22 and the first cooler 61 can be reduced.

In some embodiments, the air intake assembly 1 comprises a dry air intake pipe 11 and an auxiliary air intake pipe 12, the dry air intake pipe 11 being in communication with the first branch and the dry air intake valve 32 for providing hydrogen to the drying tower 31 through the dry air intake valve 32, the auxiliary air intake pipe 12 being in communication with the second branch and the auxiliary air intake valve 34 for providing hydrogen to the drying tower 31 through the auxiliary air intake valve 34, and a regeneration exhaust valve 37 being in communication with the dry air intake pipe 11 for feeding hydrogen discharged from the drying tower 31 into the dry air intake pipe 11.

As shown in fig. 1, the air intake assembly 1 comprises a dry air intake pipe 11 and an auxiliary air intake pipe 12, wherein the inlet end of the dry air intake pipe 11 is communicated, a first branch communicated with the dry air intake pipe is arranged at the downstream of the dry air intake pipe 11, a second branch communicated with the auxiliary air intake pipe is arranged at the downstream of the auxiliary air intake pipe 12, the air intake assembly 1 is suitable for being communicated with the electrolytic water hydrogen production equipment 100 so as to supply hydrogen prepared by the electrolytic water hydrogen production equipment 100 into a drying tower 31 in a dry state through the dry air intake pipe 11 and the first branch, hydrogen prepared by the electrolytic water hydrogen production equipment 100 is supplied into the drying tower 31 in an auxiliary state through the auxiliary air intake pipe 12 and the second branch, a regeneration exhaust valve 37 is communicated with the dry air intake pipe 11, and exhaust gas of the drying tower 31 in the auxiliary state enters the dry air intake pipe 11 through the regeneration exhaust valve 37 after entering the drying tower 31 in a regeneration state, and then enters the drying tower 31 in a working state through the first branch for drying and purification.

In some embodiments, the inlet end of the dry air intake pipe 11 is provided with a regulating valve and the inlet end of the auxiliary air intake pipe 12 is provided with a flow meter.

The flow in the dry air inlet pipe and the flow in the auxiliary air inlet pipe can be controlled by acquiring the displayed degrees through the flow meter to adjust the adjusting valve, so that the hydrogen quantity for regeneration is regulated and controlled, and when the hydrogen yield of the electrolytic hydrogen production equipment fluctuates, the hydrogen purification system can be suitable for the electrolytic water hydrogen production equipment with fluctuation or intermittence of the hydrogen yield through adjusting the flow of the auxiliary air inlet pipe.

In some embodiments, the hydrogen purification system according to the embodiment of the present invention further includes an air outlet assembly 8 and a hydrogen compensation tube 9, the air outlet assembly 8 includes an air outlet tube 81, a compressor 82 and a storage device 83, an inlet end of the air outlet tube 81 is communicated with the drying exhaust valve 33 for receiving the hydrogen discharged after drying in the drying tower 31, the compressor 82 is communicated with the air outlet tube 81 for compressing the hydrogen discharged from the air outlet tube 81, and the storage device 83 is communicated with the compressor 82 for receiving and storing the hydrogen compressed by the compressor 82. The hydrogen compensation pipe 9 communicates the storage device 83 and the auxiliary intake pipe 12 for supplementing hydrogen in the storage device 83 to the auxiliary intake pipe 12.

As shown in fig. 1 and 8, the drying exhaust valve 33 is connected to the drying tower 31 through a pipeline and is simultaneously connected to the air outlet pipe 81, so that the hydrogen dried by the drying tower 31 in a dry state is discharged into the air outlet pipe 81, the compressor 82 is connected to the air outlet pipe 81 to receive and compress the hydrogen arranged by the air outlet pipe 81, and the compressor 82 is connected to the storage device 83 through a pipeline to supply the compressed hydrogen into the storage device 83 for storage.

The hydrogen compensation pipe 9 communicates the storage device 83 and the auxiliary intake pipe 12 for replenishing hydrogen in the storage device 83 into the auxiliary intake pipe 12 and entering the drying tower 31 in a regenerated state through the drying tower 31 in an auxiliary state. When the drying tower 31 in the regenerated state fails to supply hydrogen gas for completing the regeneration operation due to the interruption of the water electrolysis hydrogen production apparatus 100, the hydrogen gas stored in the storage device 83 is supplied to the auxiliary intake pipe 12 through the hydrogen compensation pipe 9, so that the completion of the regeneration operation can be ensured.

In some embodiments, the air outlet pipe 81 is provided with an instrument air outlet 811, a pure air outlet, an exhaust air outlet 812 and a switch valve corresponding to the pure air outlet and the exhaust air outlet respectively, the compressor 82 is communicated with the pure air outlet, the instrument air outlet 811 is suitable for being connected with a detection instrument to detect that hydrogen discharged by the air outlet pipe 81 is pure air or exhaust air, when the hydrogen discharged by the air outlet pipe 81 is pure air, the hydrogen discharged by the air outlet pipe 81 is discharged to the compressor 82 through the pure air outlet, and when the hydrogen discharged by the air outlet pipe 81 is exhaust air, the hydrogen discharged by the air outlet pipe 81 is released through the exhaust air outlet 812.

As shown in fig. 1, the air outlet pipe 81 is provided with an instrument air outlet 811, a pure air outlet and an exhaust gas outlet 812, wherein the pure air outlet is communicated with the compressor 82 through a pipeline, a switch valve for opening and closing the pure air outlet is arranged on the pipeline of the pure air outlet communicated with the compressor 82, a switch valve for opening and closing the exhaust gas outlet 812 is arranged on a branch where the exhaust gas outlet 812 is located, an instrument air sampling pressure reducing valve for reducing the hydrogen pressure discharged by the instrument air outlet 811 is arranged on a branch where the instrument air outlet 811 is located, and the instrument air outlet 811 is connected with a hydrogen oxygen content analyzer and a hydrogen dew point analyzer so as to judge that the hydrogen in the air outlet pipe 81 is pure air or exhaust gas through the values obtained by the hydrogen oxygen content analyzer and the hydrogen dew point analyzer. During detection, the waste gas outlet 812 is opened, the pure gas outlet is closed, a small part of hydrogen gas exhausted by the air outlet pipe 81 is exhausted from the instrument air outlet 811 and is detected, when the detection result is pure gas, the waste gas outlet 812 is closed, the pure gas outlet is opened, hydrogen gas in the air outlet pipe 81 enters the compressor 82, when the detection result is waste gas, the waste gas outlet 812 is opened, the pure gas outlet is closed, and the hydrogen gas in the air outlet pipe 81 is released and exhausted by the waste gas outlet 812.

In some embodiments, the air intake assembly 1 further comprises a second air-water separator 13, a second cooler 14 and a third air-water separator 15 in communication in sequence, the inlet end of the second air-water separator 13 being adapted to communicate with the electrolyzed water forming apparatus 100, the outlet end of the third air-water separator 15 being in communication with the dry air intake duct 11 and the auxiliary air intake duct 12.

As shown in fig. 1, a second gas-water separator 13, a second cooler 14 and a third gas-water separator 15 which are sequentially communicated through pipelines are arranged at the upstream of the inlet ends of the drying air inlet pipe 11 and the auxiliary air inlet pipe 12, hydrogen discharged by the electrolytic water hydrogen production device 100 is firstly subjected to gas-water separation at the second gas-water separator 13, so that part of water mixed in the hydrogen is discharged out of the air inlet assembly 1, the discharged water can be returned to the electrolytic water hydrogen production device 100 for recycling, the hydrogen passing through the second gas-water separator 13 is cooled to 10-25 ℃ at the second cooler 14 to separate condensed water, then the hydrogen and the separated condensed water are separated through the third gas-water separator 15, and the water in the hydrogen is separated through the second gas-water separator 13 and the third gas-water separator 15 for two times, so that the working load of the drying tower 31 is reduced.

In some embodiments, the air intake assembly 1 further comprises a second heat exchanger 16 and a deoxygenator 17, the inlet end of the deoxygenator 17 is in communication with the third gas-water separator 15 through the second heat exchanger 16 such that the medium discharged from the third gas-water separator 15 is fed into the deoxygenator 17, both the dry air intake pipe 11 and the auxiliary air intake pipe 12 are in communication with the outlet end of the deoxygenator 17 through the second heat exchanger 16 such that the medium discharged from the deoxygenator 17 is fed into the dry air intake pipe 11 and the auxiliary air intake pipe 12, the second heat exchanger 16 being adapted to exchange heat with the medium fed into the deoxygenator 17 and the medium discharged from the deoxygenator 17.

As shown in fig. 1, the air intake assembly 1 further comprises a second heat exchanger 16 and a deoxidizer 17 which are communicated through a pipeline, the second heat exchanger 16 and the deoxidizer 17 are both positioned at the downstream of the third gas-water separator 15, the second gas-water separator 13 and the third gas-water separator 15 firstly separate water in hydrogen for two times, a large amount of water can be prevented from entering the deoxidizer 17, the deoxidizer 17 adopts a palladium catalyst to make the hydrogen catalytically react with trace oxygen to generate water so as to remove trace oxygen mixed in the hydrogen, a heater is arranged in the deoxidizer 17 to make the catalytic deoxidization temperature be 80-120 ℃, the water generated by the reaction is discharged out of the deoxidizer 17 in a steam form, and the oxygen content in the deoxidized hydrogen is lower than 1PPM. The second heat exchanger 16 is internally provided with a first heat exchange pipeline and a second heat exchange pipeline, the first heat exchange pipeline is communicated with a pipeline at the inlet end of the deoxidizer 17, the second heat exchange pipeline is communicated with a pipeline at the outlet end of the deoxidizer 17, and the medium in the first heat exchange pipeline and the medium in the second heat exchange pipeline exchange heat so as to raise the temperature of hydrogen entering the deoxidizer 17 and reduce the heating load of the deoxidizer 17.

In some embodiments, the air intake assembly 1 further comprises a third cooler 18 and a fourth air-water separator 19 in communication in sequence, the second heat exchanger 16 being in communication with the third cooler 18, the fourth air-water separator 19 being in communication with the dry air intake pipe 11 and the auxiliary air intake pipe 12.

As shown in fig. 1, the air intake assembly 1 further includes a third cooler 18 and a fourth air-water separator 19 which are sequentially connected, and the third cooler 18 and the fourth air-water separator 19 are located downstream of the second heat exchanger 16 and the deoxidizer 17, and the second heat exchange pipeline is connected with the third cooler 18, so that the third cooler 18 cools the hydrogen discharged from the deoxidizer 17 and passing through the second heat exchanger 16, and cools the hydrogen to a temperature of 10 ℃ to 20 ℃ to precipitate condensed water, and the fourth air-water separator 19 separates the hydrogen from the condensed water precipitated by the third cooler 18, and discharges the condensed water, so as to avoid a large amount of water from entering the drying tower 31.

In some embodiments, the second cooler 14, the third cooler 18 and the first cooler 61 use heat exchangers, and cooling is achieved through an external cold source.

As shown in fig. 2 to 8, the control method of the hydrogen purification system according to the embodiment of the present invention includes the following steps:

s1. the drying intake valve 32 and the drying exhaust valve 33 of the first drying device 3 are controlled to open to be in a drying state, the regeneration intake valve 36 and the regeneration exhaust valve 37 of the second drying device 4 are controlled to open to be in a regeneration state, and the auxiliary intake valve 34 and the auxiliary exhaust valve 35 of the third drying device 5 are controlled to open to be in an auxiliary state for a T1 time. Specifically, as shown in fig. 2, a part of hydrogen of the electrolyzed water hydrogen production apparatus 100 enters the first drying device 3 through the drying inlet pipe 11 to be dried and purified, and then is discharged to the outlet pipe 81, another part of hydrogen of the electrolyzed water hydrogen production apparatus 100 enters the third drying device 5 and the second drying device 4 in sequence through the auxiliary inlet pipe 12, then enters the drying inlet pipe 11 through the circulation pipe 6, then enters the first drying device 3 to be dried and purified, and is discharged to the outlet pipe 81, and the process lasts for a time T1.

S2, the drying air inlet valve 32 and the drying air outlet valve 33 of the first drying device 3 are controlled to be opened to be in a drying state, the regeneration air inlet valve 36 and the regeneration air outlet valve 37 of the second drying device 4 are controlled to be closed to be in a standby state, and the auxiliary air inlet valve 34 and the auxiliary air outlet valve 35 of the third drying device 5 are controlled to be closed to be in a standby state for a time T2. Specifically, as shown in fig. 3, all hydrogen of the electrolytic water hydrogen production apparatus 100 enters the first drying device 3 through the drying inlet pipe 11 to be dried and purified, and then is discharged to the outlet pipe 81, and the drying inlet valve 32, the drying outlet valve 33, the auxiliary inlet valve 34, the auxiliary outlet valve 35, the regeneration inlet valve 36 and the regeneration outlet valve 37 of the second drying device 4 and the third drying device 5 are all closed, so that the second drying device 4 and the third drying device 5 are in a standby state, the process lasts for a time T2, and the hydrogen production amount of the electrolytic water hydrogen production apparatus 100 in the process is smaller than that in the state shown in fig. 1.

S3, the auxiliary air inlet valve 34 and the auxiliary air outlet valve 35 of the first drying device 3 are controlled to be opened to be in an auxiliary state, the drying air inlet valve 32 and the drying air outlet valve 33 of the second drying device 4 are controlled to be opened to be in a drying state, and the regeneration air inlet valve 36 and the regeneration air outlet valve 37 of the third drying device 5 are controlled to be opened to be in a regeneration state for a time T1. Specifically, as shown in fig. 4, a part of hydrogen in the electrolytic water hydrogen production apparatus 100 enters the second drying device 4 to be dried and purified and then discharged, and another part of hydrogen in the electrolytic water hydrogen production apparatus 100 sequentially passes through the first drying device 3 and the third drying device 5 and then enters the second drying device 4 through the circulation line 6.

S4, the auxiliary air inlet valve 34 and the auxiliary air outlet valve 35 of the first drying device 3 are controlled to be closed to be in a standby state, the drying air inlet valve 32 and the drying air outlet valve 33 of the second drying device 4 are controlled to be open to be in a drying state, and the regeneration air inlet valve 36 and the regeneration air outlet valve 37 of the third drying device 5 are controlled to be closed to be in a standby state for a time T2. Specifically, as shown in fig. 5, all hydrogen in the electrolytic water hydrogen production apparatus 100 enters the second drying device 4 to be dried and purified, and then is discharged.

S5, the regeneration air inlet valve 36 and the regeneration air outlet valve 37 of the first drying device 3 are controlled to be opened to be in a regeneration state, the auxiliary air inlet valve 34 and the auxiliary air outlet valve 35 of the second drying device 4 are controlled to be opened to be in an auxiliary state, and the drying air inlet valve 32 and the drying air outlet valve 33 of the third drying device 5 are controlled to be opened to be in a drying state for a time T1. Specifically, as shown in fig. 6, a part of hydrogen in the electrolytic water hydrogen production apparatus 100 enters the third drying device 5 to be dried and purified and then discharged, and another part of hydrogen in the electrolytic water hydrogen production apparatus 100 sequentially passes through the second drying device 4 and the first drying device 3 and then enters the third drying device 5 through the circulation line 6.

S6, controlling the regeneration air inlet valve 36 and the regeneration air outlet valve 37 of the first drying device 3 to be closed to be in a standby state, controlling the auxiliary air inlet valve 34 and the auxiliary air outlet valve 35 of the second drying device 4 to be closed to be in a standby state and controlling the drying air inlet valve 32 and the drying air outlet valve 33 of the third drying device 5 to be open to be in a drying state for a time T2; wherein T1 and T2 are constants greater than 0, respectively, and T1 is greater than T2. Specifically, as shown in fig. 7, all hydrogen in the water electrolysis hydrogen production plant 100 enters the third drying device 5 to be dried and purified, and then is discharged.

After the step S6 is finished, the process returns to the step S1 for circulation so as to enable the hydrogen purification system to circularly operate, and the hydrogen demand amount purified by the hydrogen purification system can be adjusted so as to adapt to the electrolytic water hydrogen production equipment 100 with fluctuation or intermittence of the hydrogen yield, in particular to the electrolytic water hydrogen production equipment 100 of the photovoltaic energy.

In the drying device in the dry state, the auxiliary intake valve 34, the auxiliary exhaust valve 35, the regeneration intake valve 36, and the regeneration exhaust valve 37 are closed. The drying device in the auxiliary state is such that the drying intake valve 32, the drying exhaust valve 33, the regeneration intake valve 36 and the regeneration exhaust valve 37 are closed. The drying device in the regeneration state is such that the drying intake valve 32, the drying exhaust valve 33, the auxiliary intake valve 34 and the auxiliary exhaust valve 35 are closed.

Preferably, T1 is 7 to 10 hours, more preferably 8 hours, and T2 is 5 hours or less.

According to the control method of the hydrogen purification system, the first drying device, the second drying device and the third drying device are respectively in the drying state, the auxiliary state and the regeneration state at the same time, and when the drying devices in the drying state operate, the drying devices in the auxiliary state and the regeneration state can be switched into the standby state, so that the hydrogen production equipment with fluctuation or intermittence in cooperation with the hydrogen production can be realized.

In some embodiments, in the time T1, in the time period 0 to T1, the first valve 21 is controlled to be opened and the second valve 23 is controlled to be closed, so that the drying device in the regeneration state is in the heating regeneration stage, 50% or less of the hydrogen production amount of the electrolytic water hydrogen production device 100 is introduced into the drying device in the regeneration state, and in the time period T1 to T2, the first valve 21 is controlled to be opened and the second valve 23 is controlled to be closed, so that the drying device in the regeneration state is in the heating regeneration stage, and more than 50% of the hydrogen production amount of the electrolytic water hydrogen production device 100 is introduced into the drying device in the regeneration state; in the time period of t 2-t 3, the first valve 21 is controlled to be closed and the second valve 23 is controlled to be opened, so that the drying device in a regeneration state is in a cold blowing regeneration stage, and more than 50% of hydrogen production amount of the electrolytic water hydrogen production equipment 100 is introduced into the drying device in the regeneration state; in the time period of t 3-t 4, the first valve 21 is controlled to be closed and the second valve 23 is controlled to be opened, so that the drying device in a regeneration state is in a cold blowing regeneration stage, and 50% or less of the hydrogen production amount of the water electrolysis hydrogen production equipment 100 is introduced into the drying device in the regeneration state; wherein t1, t2, t3 and t4 are constants greater than 0, respectively.

Specifically, the time T1 is divided into a time period of 0 to T1, a time period of T1 to T2, a time period of T2 to T3 and a time period of T3 to T4 in sequence, and in the time period of T1 lasting in the step S1, the time periods of step S3 and step S5 are respectively provided with the time period of 0 to T1, the time period of T1 to T2, the time period of T2 to T3 and the time period of T3 to T4.

In some embodiments, t1=t4-t 3, t2-t1=t3-t 2, t1 < t2-t1, t2+.gtoreq.t4/2.

Preferably, t1=1.5, t2=4, t3=6.5, t4=8,

when the photovoltaic energy source is adopted in the electrolytic water hydrogen production device 100, the hydrogen demand of the hydrogen purification system is required to be matched with the sunlight time, so that the total time length of T1+T2 is matched with the sunlight time in one day, preferably, the total time length of T1+T2 is 8-13 hours, the hydrogen demand of the photovoltaic energy source in the early and late time period of the photovoltaic water hydrogen production device 100 is insufficient to meet the regeneration flow demand, so that 50% or less of the hydrogen production amount of the electrolytic water hydrogen production device 100 is sequentially introduced into the drying device in the auxiliary state and the drying device in the regeneration state within 0-1.5 hours of operation of the drying device in the auxiliary air inlet pipe 12, for carrying out small-flow heating regeneration, for example, in step S3, the first drying device 3 is in the auxiliary state, the second drying device 4 is in the drying state, the third drying device 5 is in the regeneration state, and 0-50% of the hydrogen production amount of the electrolytic water hydrogen production device 100 comprises 50%, and 50% of the hydrogen is sequentially introduced into the first drying device 3 and the third drying device 5 through the auxiliary air inlet pipe 12, so that the third drying device 5 is subjected to small-flow heating regeneration is carried out.

And (3) in 1.5-4 hours of running of the drying device in the regeneration state, introducing more than 50% of the hydrogen production amount of the electrolytic water hydrogen production equipment 100 into the drying device in the auxiliary state and the drying device in the regeneration state in sequence for carrying out high-flow heating regeneration, so that the hydrogen purification system can complete heating regeneration in 0-4 hours and adapt to fluctuation of the hydrogen production amount of the electrolytic water hydrogen production equipment 100.

And (3) in 4-6.5 hours of running of the drying device in the regeneration state, sequentially introducing more than 50% of hydrogen production amount of the electrolytic water hydrogen production equipment 100 into the drying device in the auxiliary state and the drying device in the regeneration state for carrying out large-flow cold blowing regeneration, and then in 6.5-8 hours, sequentially introducing 0-50% of hydrogen production amount of the electrolytic water hydrogen production equipment 100, including 50%, into the drying device in the auxiliary state and the drying device in the regeneration state for carrying out small-flow cold blowing regeneration. Therefore, the hydrogen purification system can complete the blowing cooling regeneration within 4-8 hours and adapt to the fluctuation of the hydrogen production amount of the electrolytic water hydrogen production equipment 100.

Therefore, the total hydrogen demand of the hydrogen purification system can be adjusted by setting the time period of 0 to t1, the time period of t1 to t2, the time period of t2 to t3 and the time period of t3 to t4 and setting and controlling the hydrogen quantity used for regeneration in the corresponding time periods, so that the total hydrogen demand of the hydrogen purification system has volatility and the hydrogen electrolysis hydrogen production equipment with the volatility can be adapted to the hydrogen quantity.

In some embodiments, when there is an interruption or multiple restarting interruptions in the time T1 time+t2 in which the first drying device 3 is in the dry state, or when there is an interruption or multiple restarting interruptions in the time T1 time+t2 in which the second drying device 4 is in the dry state, or when there is an interruption or multiple restarting interruptions in the time T1 time+t2 in which the third drying device 5 is in the dry state, the accumulated operation duration value of the drying device in the dry state before the last interruption after the last switching to the dry state is recorded as T0, the uninterrupted operation duration value of the drying device of the hydrogen purification system before the last interruption is recorded as T0, and T0 are constants greater than 0, respectively.

When T0 is smaller than T1/2 and T0 is smaller than T1/2, the hydrogen purification system directly enters a stop state or is restarted, wherein the drying device in a dry state before the last interruption enters the dry state again after the hydrogen purification system is restarted for a period of time of T1+T2-T0, or enters the dry state again and enters the stop state after a period of time of T1; the drying device in the auxiliary state before the last interruption is restarted after the hydrogen purification system is restarted, and enters the auxiliary state again and enters a stop state or standby time T2-T0 after lasting for T1 time; the drying device in the regeneration state before the last interruption is restarted after the hydrogen purification system is restarted, and enters a stop state or standby time T2-T0 after lasting for T1 time.

When T0 is greater than or equal to T1/2 and T0 is less than T3, the storage device 83 supplies hydrogen to the auxiliary intake pipe 12 after the hydrogen purification system is restarted, so that the drying device in the regeneration state before the last interruption continues to perform the regeneration state before the last interruption for T5 time, and when t5+t0=t3, the drying device in the regeneration state before the last interruption enters the drying state, and then enters the shutdown state, wherein T5 is a constant greater than 0.

When T0 is greater than or equal to T1/2 and T0 is greater than or equal to T3, the hydrogen purification system directly enters a shutdown state or is restarted, wherein the drying device in the regeneration state before the last interruption enters a drying state after the hydrogen purification system is restarted.

Specifically, when renewable energy sources are adopted by the electrolytic water hydrogen production device 100, the hydrogen production amount is interrupted or stopped due to interruption or stop of the power sources, for example, when photovoltaic energy sources are adopted by the electrolytic water hydrogen production device 100, the hydrogen production amount of the electrolytic water hydrogen production device 100 is interrupted or stopped in cloudy days or rainy days, so that a hydrogen purification system is interrupted, the hydrogen purification system needs to be restarted after interruption, sometimes, the hydrogen purification system is interrupted again after a plurality of times of interruption restarting, and in the process of a plurality of times of restarting, a certain time interval is formed between two adjacent restarting times, so that the temperature inside the drying tower is reduced.

Preferably T1/2 is 4, and when T0 is less than 4 and T0 is less than 4, the drying device in the regeneration state before the last interruption is not completed in the heating regeneration stage at the last interruption, the hydrogen purification system can directly enter the shutdown state or restart, wherein after the hydrogen purification system is restarted, the drying device in the drying state before the last interruption is reentered in the drying state for a period of time of t1+t2-T0, preferably 13-T0, or reenters in the drying state and enters the shutdown state after the duration of T1, preferably enters the drying state again for 8 hours, and then shuts down. The drying device in the auxiliary state before the last interruption is brought back into the auxiliary state for a time T1, preferably 8 hours, and then into the idle state or standby T2-T0, preferably 5-T0 hours. The drying means in the regenerated state before the last interruption is brought back into the regenerated state for a time T1, preferably 8 hours, and then brought into a stop or standby time T2-T0, preferably 5-T0 hours, so that the drying means in the regenerated state before the interruption can complete the regeneration.

The drying device in the regenerated state before the last interruption is a corresponding one of the first drying device 3, the second drying device 4 and the third drying device 5 in the regenerated state in step S1, step S3 and step S5.

Preferably t3=6.5, when T0 is greater than or equal to 4 and T0 is less than 6.5, the drying device in the regeneration state before the last interruption is not completed in the heating regeneration stage, or the heating regeneration stage is completed, but the cooling regeneration stage is not completed, at this time, the drying device in the regeneration state before the last interruption is not required to be restarted after restarting, hydrogen is provided to the auxiliary air inlet pipe 12 through the storage device 83 before entering the shutdown state, at this time, the drying air inlet pipe 11 and the auxiliary air inlet pipe 12 do not receive the hydrogen provided by the electrolytic water hydrogen production device 100, which may be that the electrolytic water hydrogen production device 100 does not generate hydrogen, or a pipeline between the drying air inlet pipe 11 and the auxiliary air inlet pipe 12 and the electrolytic water hydrogen production device 100 is closed through a valve, the hydrogen discharged by the storage device 83 is sequentially supplied to the drying device in the auxiliary state and the drying device in the regeneration state, for T5 time, T5 is a constant greater than 0, so that the drying device in the regeneration state before the last interruption is continued to be in the regeneration state before entering the shutdown state, when t5+t0=t3, the drying device in the regeneration state before the last interruption is completed, the drying device in the regeneration state is completed after the last interruption is completed, the drying device in the regeneration state is completed, and the cooling state is controlled to be completed after the system has been completed, and the system is in the shutdown state is completed. When the drying device in the regeneration state before restarting continues to perform the regeneration state before the last interruption, the drying device can enter a heating regeneration stage or a cooling regeneration stage, and the specific stage is adjusted according to the value of t 0.

And when T0 is more than or equal to 4 hours and T0 is more than or equal to 6.5 hours, the drying device in the regeneration state before the last interruption is finished with large-flow cold blowing regeneration, which can be regarded as basically finishing the regeneration state, so that the hydrogen purification system can directly enter a shutdown state or restart, wherein after the hydrogen purification system restarts, the hydrogen purification system enters the next step, and the drying device in the regeneration state before the last interruption is converted into the drying state.

Therefore, by adopting corresponding restarting steps when T0 and T0 are different in value, the regeneration state of the hydrogen purification system after the interruption can still be completed, and the problem of incomplete regeneration can not be generated.

The shutdown of the hydrogen purification system means that none of the first drying device 3, the second drying device 4, and the third drying device 5 is operated, the standby of the hydrogen purification system means that one of the first drying device 3, the second drying device 4, and the third drying device 5 is operated, and the remaining two are not operated.

In the description of the present invention, it should be understood that the terms "first" and "second" are used merely to distinguish components and should not be interpreted as indicating or implying a relative importance or implying a number of technical features which is indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and the like are to be construed broadly and include, for example, either fixedly attached, detachably attached, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While the above embodiments have been shown and described, it should be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives, and variations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the invention.

Claims

1. A hydrogen purification system, characterized by comprising an air intake assembly (1), a regeneration status switching pipeline (2), a first drying device (3), a second drying device (4) and a third drying device (5), the air intake assembly (1) having a first branch and a second branch, the regeneration status switching pipeline (2) comprising a first valve (21) and a heater (22) connected in series, and a second valve (23) connected in parallel with both the first valve (21) and the heater (22);

Each of the first drying device (3), the second drying device (4) and the third drying device (5) comprises:

a drying tower (31);

the drying air inlet valve (32) is connected with the drying tower (31) and the first branch and used for controlling the on-off of the first branch and the drying tower (31);

a drying exhaust valve (33), wherein the drying exhaust valve (33) is connected with the drying tower (31) and is used for exhausting the hydrogen gas dried by the drying tower (31);

the auxiliary air inlet valve (34) is connected with the drying tower (31) and the second branch and used for controlling the on-off of the second branch and the drying tower (31);

an auxiliary exhaust valve (35), wherein the auxiliary exhaust valve (35) is connected with the drying tower (31) and the air inlet end of the regeneration state switching pipeline (2) and is used for controlling the on-off of the drying tower (31) and the regeneration state switching pipeline (2);

the regeneration air inlet valve (36) is connected with the drying tower (31) and the air outlet end of the regeneration state switching pipeline (2) and is used for controlling the on-off of the regeneration state switching pipeline (2) and the drying tower (31);

The regeneration exhaust valve (37), regeneration exhaust valve (37) connect drying tower (31) with intake subassembly (1) is used for controlling drying tower (31) with the break-make of intake subassembly (1), just regeneration exhaust valve (37) are located drying air inlet valve (32) the upper reaches.

2. The hydrogen purification system according to claim 1, characterized in that each of the first drying device (3), the second drying device (4) and the third drying device (5) has a dry state in which hydrogen enters the drying tower (31) through the drying intake valve (32) and is discharged through the drying exhaust valve (33), an auxiliary state in which hydrogen enters the drying tower (31) through the auxiliary intake valve (34) and is discharged through the auxiliary exhaust valve (35), and a regeneration state in which hydrogen enters the drying tower (31) through the regeneration intake valve (36) and is discharged through the regeneration exhaust valve (37),

wherein one of the first drying device (3), the second drying device (4) and the third drying device (5) is in the dry state,

-another of the first drying means (3), the second drying means (4) and the third drying means (5) is in the auxiliary state, the remaining one being in the regeneration state; or alternatively

The other and the remaining one of the first drying device (3), the second drying device (4) and the third drying device (5) are all in a standby state.

3. The hydrogen purification system according to claim 2, wherein the regeneration state comprises a heating regeneration phase in which the first valve (21) is open and the second valve (23) is closed, and a cool-air regeneration phase in which the first valve (21) is closed and the second valve (23) is open.

4. The hydrogen purification system according to claim 1, further comprising a circulation pipeline (6), wherein an air inlet end of the circulation pipeline (6) is communicated with the regeneration exhaust valve (37), an air outlet end of the circulation pipeline (6) is communicated with the air inlet assembly (1), a first cooler (61) and a first gas-water separator (62) which are sequentially arranged are arranged on the circulation pipeline (6), and the first gas-water separator (62) is used for separating gas and liquid in the circulation pipeline (6).

5. The hydrogen purification system according to claim 4, further comprising a first heat exchanger (7), the first heat exchanger (7) being in communication with the circulation line (6), and the first cooler (61) being located downstream of the first heat exchanger (7), the first heat exchanger (7) being in communication with the regeneration-state switching line (2) and downstream of the first valve (21), the first heat exchanger (7) being for heat exchange between the medium in the circulation line (6) and the medium in the regeneration-state switching line (2).

6. The hydrogen purification system according to claim 1, characterized in that the intake assembly (1) comprises a drying intake pipe (11) and an auxiliary intake pipe (12), the drying intake pipe (11) being in communication with the first branch and the drying intake valve (32) for providing hydrogen to the drying column (31) through the drying intake valve (32), the auxiliary intake pipe (12) being in communication with the second branch and the auxiliary intake valve (34) for providing hydrogen to the drying column (31) through the auxiliary intake valve (34), the regeneration exhaust valve (37) being in communication with the drying intake pipe (11) for feeding hydrogen discharged from the drying column (31) into the drying intake pipe (11).

7. The hydrogen purification system according to claim 6, characterized in that the inlet end of the dry inlet pipe (11) is provided with a regulating valve and the inlet end of the auxiliary inlet pipe (12) is provided with a flow meter.

8. The hydrogen purification system according to claim 6, further comprising an outlet assembly (8) and a hydrogen compensation tube (9), the outlet assembly (8) comprising:

the inlet end of the air outlet pipe (81) is communicated with the drying exhaust valve (33) and is used for receiving the hydrogen exhausted after the drying tower (31) is dried;

a compressor (82), wherein the compressor (82) is communicated with the air outlet pipe (81) and is used for compressing the hydrogen discharged by the air outlet pipe (81); and

-a storage device (83), said storage device (83) being in communication with said compressor (82) for receiving and storing hydrogen compressed by said compressor (82);

the hydrogen compensation pipe (9) is communicated with the storage device (83) and the auxiliary air inlet pipe (12) and is used for supplementing hydrogen in the storage device (83) to the auxiliary air inlet pipe (12).

9. The hydrogen purification system according to claim 8, wherein the outlet pipe (81) is provided with an instrument outlet (811), a pure gas outlet, an exhaust gas outlet (812) and a switch valve corresponding to the pure gas outlet and the exhaust gas outlet, respectively, the compressor (82) is communicated with the pure gas outlet, the instrument outlet (811) is adapted to be connected with a detection instrument to detect that hydrogen discharged from the outlet pipe (81) is pure gas or exhaust gas, wherein when hydrogen discharged from the outlet pipe (81) is pure gas, hydrogen discharged from the outlet pipe (81) is discharged from the pure gas outlet to the compressor (82), and wherein when hydrogen discharged from the outlet pipe (81) is exhaust gas, hydrogen discharged from the outlet pipe (81) is discharged from the exhaust gas outlet (812).

10. The hydrogen purification system according to claim 6, wherein the inlet assembly (1) further comprises a second gas-water separator (13), a second cooler (14) and a third gas-water separator (15) in communication in sequence, the inlet end of the second gas-water separator (13) being adapted to communicate with an electrolyzed water hydrogen plant (100), the outlet end of the third gas-water separator (15) being in communication with the dry inlet pipe (11) and the auxiliary inlet pipe (12).

11. The hydrogen purification system according to claim 10, characterized in that the inlet assembly (1) further comprises a second heat exchanger (16) and a deoxygenator (17), the inlet end of the deoxygenator (17) being in communication with the third gas-water separator (15) through the second heat exchanger (16) such that the medium discharged by the third gas-water separator (15) is fed into the deoxygenator (17), the dry inlet pipe (11) and the auxiliary inlet pipe (12) being in communication with the outlet end of the deoxygenator (17) through the second heat exchanger (16) such that the medium discharged by the deoxygenator (17) is fed into the dry inlet pipe (11) and the auxiliary inlet pipe (12), the second heat exchanger (16) being adapted for heat exchange with the medium fed into the deoxygenator (17) and the medium discharged by the deoxygenator (17).

12. The hydrogen purification system according to claim 11, wherein the inlet assembly (1) further comprises a third cooler (18) and a fourth gas-water separator (19) in communication in sequence, the second heat exchanger (16) being in communication with the third cooler (18), the fourth gas-water separator (19) being in communication with the dry inlet pipe (11) and the auxiliary inlet pipe (12).

13. A control method of a hydrogen purification system, characterized in that the control method comprises, based on the hydrogen purification system according to any one of claims 1 to 12:

-controlling the opening of the drying inlet valve and the drying outlet valve of the first drying means (3) to be in a dry state, the opening of the regeneration inlet valve and the regeneration outlet valve of the second drying means (4) to be in a regeneration state and the opening of the auxiliary inlet valve and the auxiliary outlet valve of the third drying means (5) to be in an auxiliary state for a time T1;

-controlling the opening of the drying inlet valve and the drying outlet valve of the first drying means (3) to be in a dry state, the closing of the regeneration inlet valve and the regeneration outlet valve of the second drying means (4) to be in a standby state and the closing of the auxiliary inlet valve and the auxiliary outlet valve of the third drying means (5) to be in a standby state for a time T2;

-controlling the auxiliary inlet valve and the auxiliary outlet valve of the first drying means (3) to open in an auxiliary state, the drying inlet valve and the drying outlet valve of the second drying means (4) to open in a drying state and the regeneration inlet valve (36) and the regeneration outlet valve of the third drying means (5) to open in a regeneration state for a time T1;

-controlling the auxiliary inlet valve (34) and the auxiliary outlet valve of the first drying means (3) to be turned closed to be in a standby state, the drying inlet valve and the drying outlet valve of the second drying means (4) to be opened to be in a drying state, and the regeneration inlet valve and the regeneration outlet valve of the third drying means (5) to be turned closed to be in a standby state for a T2 time;

-controlling the opening of the regeneration inlet valve and the regeneration outlet valve of the first drying means (3) to be in a regeneration state, the opening of the auxiliary inlet valve and the auxiliary outlet valve of the second drying means (4) to be in an auxiliary state and the opening of the drying inlet valve and the drying outlet valve of the third drying means (5) to be in a drying state for a time T1;

-controlling the regeneration inlet valve and the regeneration outlet valve of the first drying means (3) to be turned closed to be in a standby state, the auxiliary inlet valve and the auxiliary outlet valve of the second drying means (4) to be turned closed to be in a standby state and the drying inlet valve and the drying outlet valve of the third drying means (5) to be opened to be in a drying state for a time T2;

14. A control method of a hydrogen purification system according to claim 13, wherein, with the hydrogen purification system according to claim 3, during the T1 time,

in the period of 0-t 1, controlling the first valve (21) to be opened and the second valve (23) to be closed so as to enable the drying device in the regeneration state to be in the heating regeneration stage, and introducing 50% or less of the hydrogen production amount of the water electrolysis hydrogen production equipment (100) into the drying device in the regeneration state;

in the time period of t 1-t 2, controlling the first valve (21) to be opened and the second valve (23) to be closed so that the drying device in the regeneration state is in the heating regeneration stage, and introducing more than 50% of hydrogen production amount of the water electrolysis hydrogen production equipment (100) into the drying device in the regeneration state;

In the time period of t2-t 3, controlling the first valve (21) to be closed and the second valve (23) to be opened so as to enable the drying device in the regeneration state to be in the cold blowing regeneration stage, and introducing more than 50% of hydrogen production amount of the water electrolysis hydrogen production equipment (100) into the drying device in the regeneration state;

in the time period of t3-t 4, controlling the first valve (21) to be closed and the second valve (23) to be opened so as to enable the drying device in the regeneration state to be in the cold blowing regeneration stage, and introducing 50% or less of the hydrogen production amount of the water electrolysis hydrogen production equipment (100) into the drying device in the regeneration state;

wherein t1, t2, t3 and t4 are constants greater than 0, respectively.

15. The method of controlling a hydrogen purification system according to claim 14, wherein t1=t4-t 3, t2-t1=t3-t 2, t1 < t2-t1, and t2 is equal to or greater than t4/2.

16. The control method of a hydrogen purification system according to claim 13, characterized in that with the hydrogen purification system according to claim 8, when there is an interruption or a plurality of restart interruptions in the time T1 time + the time T2 in which the first drying device (3) is in the dry state, or when there is an interruption or a plurality of restart interruptions in the time T1 time + the time T2 in which the second drying device (4) is in the dry state, or when there is an interruption or a plurality of restart interruptions in the time T1 time + the time T2 in which the third drying device (5) is in the dry state, the cumulative operation time value of the drying device in the dry state before the last interruption after the last switching to the dry state is denoted as T0, the drying device uninterrupted operation time values of the hydrogen purification system before the last interruption are denoted as T0, and T0 are constants greater than 0, respectively;

when T0 is greater than or equal to T1/2 and T0 is less than T3,

the storage device (83) supplies hydrogen to the auxiliary air inlet pipe (12) after the hydrogen purification system is restarted, so that the drying device in the regeneration state before the last interruption continues to perform the regeneration state before the last interruption for t5 time, and when t5+t0=t3, the drying device in the regeneration state before the last interruption enters the drying state and then enters a shutdown state, wherein t5 is a constant greater than 0;