Hydrogen drying system for hydrogen production using renewable energy

Abstract

A hydrogen drying system for hydrogen production using renewable energy. Two adsorbers (1, 2) are arranged in parallel, the two adsorbers (1, 2) alternately perform an adsorption process and a desorption process, the adsorption flow of each of the adsorbers (1, 2) changes along with the fluctuations of input renewable energy, and an operating state of each of the adsorbers (1, 2) is switched by means of accumulating the hydrogen flow treated by each of the adsorbers (1, 2) during a single adsorption process; a pre-adsorber (3) is connected in series to one of the adsorbers (1, 2) and is used for assisting in the desorption process; and during the desorption process, hydrogen in the pre-adsorber (3) or the adsorbers (1, 2) is circulated by means of a hydrogen self-circulation apparatus (4), and the desorption process is independent of the adsorption process. Since the adsorption process and the desorption process are independent of each other, after a raw gas enters the adsorbers (1, 2) and absorption is completed, all the raw gas is output; and during the desorption process, hydrogen in the pre-adsorber (3) or the adsorbers (1, 2) is circulated by means of the hydrogen self-circulation apparatus (4) to realize hydrogen regeneration, so that the problem of desorption being incomplete due to desorption interruption caused by the flow fluctuations of the raw hydrogen is solved, intermittent and fluctuating renewable energy can be matched to perform hydrogen production, and an operating flow range of 0-100% can be realized.

Description

Hydrogen drying system for hydrogen production from renewable energy

[0001] This application claims priority to a patent application filed with the State Intellectual Property Office of China on September 12, 2023, with application number 202311174725.8 and titled “Hydrogen Drying System for Hydrogen Production from Renewable Energy.” Technical Field

[0002] The present application relates to the technical field of hydrogen production by electrolysis of water, and in particular to a hydrogen drying system for hydrogen production from renewable energy. Background Art

[0003] Hydrogen energy has become a crucial component of my country's future energy system, with renewable energy hydrogen production being a key development direction. Hydrogen energy is widely used in energy storage, metallurgy, chemical engineering, transportation, and other fields. Existing renewable energy hydrogen production methods typically dry the hydrogen using temperature swing adsorption. To minimize the loss of regenerated hydrogen, a three-tower adsorber cycle is typically used.

[0004] Most hydrogen drying equipment in the prior art requires a continuous supply of raw hydrogen to ensure that the adsorbent in the adsorber can continuously perform high-temperature desorption, and enter the next adsorption cycle after complete desorption. There are certain requirements for the flow rate of the raw gas when the adsorbent in the adsorber is desorbed. Too small a flow rate will result in incomplete desorption. When matching renewable energy for hydrogen production, once the front-end power supply is unstable, the production of raw hydrogen will be intermittent or fluctuate over a large range. Fluctuations or interruptions in the raw hydrogen will make it difficult to ensure that the adsorbent inside the adsorber can be completely desorbed, resulting in the inability to output dry hydrogen after entering the next adsorption cycle. Moreover, most of the adsorbers in the prior art are timed switching. When matching renewable energy for hydrogen production, the adsorber is regenerated before adsorption is saturated, which to a certain extent leads to frequent heating and desorption in the desorption stage, resulting in energy loss. Therefore, it is necessary to design a hydrogen drying system suitable for intermittent and fluctuating conditions.

[0005] Application Contents

[0006] The present application provides a hydrogen drying system for producing hydrogen from renewable energy, so as to reduce the frequency of heating and desorption, lower energy consumption, and ensure the desorption and drying effects.

[0007] In order to achieve the above-mentioned objectives, the present application provides a hydrogen drying system for hydrogen production from renewable energy, comprising two adsorbers, a pre-adsorber, a hydrogen self-circulation device, a desorption heater, a desorption cooler and a desorption gas-water separator; wherein, the two adsorbers are arranged in parallel, and the two adsorbers alternately perform adsorption and desorption processes, the adsorption flow of the adsorber varies with the fluctuation of the input renewable energy, and the working state of the adsorber is switched by accumulating the hydrogen flow processed by the single adsorption process of the adsorber; the pre-adsorber is connected in series with one of the adsorbers to assist the desorption process; the desorption process circulates the hydrogen in the pre-adsorber or adsorber through the hydrogen self-circulation device, and is independent of the adsorption process, and dry hydrogen is directly output after the adsorption process is completed; the desorption heater is connected to the outlet of the hydrogen self-circulation device to heat the hydrogen output by the hydrogen self-circulation device; the inlet of the desorption cooler is connected to the adsorber or the pre-adsorber, and the outlet is connected to the desorption gas-water separator, which is used to condense water vapor entrained in the hydrogen in the desorption process, and separate hydrogen and liquid water through the desorption gas-water separator, and the hydrogen outlet of the desorption gas-water separator is connected to the adsorber or the pre-adsorber.

[0008] Furthermore, the two adsorbers are respectively a first adsorber and a second adsorber, the inlet of the first adsorber is connected to the raw hydrogen inlet through a first adsorption air inlet automatic valve, the inlet of the first adsorber is connected through a first desorption air outlet automatic valve, a pre-adsorption air inlet automatic valve and a pre-adsorber which are arranged in sequence, the outlet of the first adsorber is connected to the first adsorption air outlet automatic valve for discharging hydrogen, the outlet of the first adsorber is connected to the hydrogen self-circulation device and the pre-adsorber through a first desorption air inlet automatic valve and a first pre-adsorption air outlet automatic valve which are arranged in sequence; the inlet of the second adsorber is connected to the raw hydrogen inlet through a second adsorption air inlet automatic valve, and the inlet of the second adsorber is connected to the raw hydrogen inlet. The outlet is connected through a second desorption outlet automatic valve, an adsorber desorption outlet automatic switching valve and a desorption cooler which are arranged in sequence, the outlet of the second adsorber is connected with a second adsorption outlet automatic valve for discharging hydrogen, and the outlet of the second adsorber is connected with a desorption heater through a second desorption inlet automatic valve and an adsorber desorption inlet automatic switching valve which are arranged in sequence; wherein, the two adsorbers share a pre-adsorption inlet automatic valve, a pre-adsorption outlet automatic valve, an adsorber desorption inlet automatic switching valve and an adsorber desorption outlet automatic switching valve; the outlet of the first adsorber is connected to a first pressure transmitter, and the outlet of the second adsorber is connected to a second pressure transmitter.

[0009] Furthermore, the inlet of the pre-adsorbent is connected to the pre-adsorption air intake automatic switching valve and the pre-adsorption air intake automatic valve, the inlet of the pre-adsorbent is connected to the desorption cooler through the desorption air outlet automatic switching valve, the outlet of the pre-adsorbent is connected to the external charging inlet through the desorption air intake automatic switching valve, the outlet of the pre-adsorbent is connected to the hydrogen self-circulation device and the pre-adsorption air outlet automatic switching valve through the pre-adsorption air outlet automatic switching valve, and the outlet of the pre-adsorbent is connected to the third pressure transmitter.

[0010] Furthermore, the inlet of the hydrogen self-circulation device is connected to the pre-adsorber or adsorber, and the hydrogen self-circulation device includes multiple sets of self-circulation units. When the working flow of a single set of self-circulation units does not meet the desorption flow requirement, the multiple sets of self-circulation units operate in parallel; each set of self-circulation units includes a self-circulation inlet shut-off valve, self-circulation equipment, a self-circulation outlet check valve and a self-circulation outlet shut-off valve connected in sequence.

[0011] Furthermore, the hydrogen drying system for hydrogen production from renewable energy also includes a raw hydrogen inlet, a product hydrogen outlet, a hydrogen venting port, a cooling water outlet, a cooling water inlet, a sewage outlet, an external pressure inlet and a water collector; wherein, the raw hydrogen inlet is connected to the inlet of the adsorber, the product hydrogen outlet is connected to the outlet of the adsorber through a product hydrogen automatic valve, the hydrogen venting port is connected to the outlet of the adsorber through a hydrogen venting automatic valve, and a self-operated pressure regulating valve, a hydrogen flowmeter and a hydrogen dew point meter are provided on the pipeline connecting the adsorber to the product hydrogen outlet, the cooling water inlet and the cooling water outlet are both connected to the desorption cooler, the external pressure inlet is connected to the adsorber and the pre-adsorber through the external pressure automatic valve, the liquid outlet of the desorption gas-water separator is connected to the inlet of the water collector through the liquid outlet automatic valve, and the outlet of the water collector is connected to the sewage outlet through the sewage automatic valve.

[0012] Furthermore, the desorption process includes a charging stage, a desorption stage, a pre-adsorption stage, a waiting stage and a pressure replenishing stage. The pre-adsorption process of the pre-adsorber includes a charging stage, a pre-adsorption stage, a desorption stage, a pressure replenishing stage and a waiting stage. The two adsorbers are the first adsorber and the second adsorber. If the first adsorber is in the adsorption process A1, then the second adsorber is in the desorption process D, which is A1D; if the second adsorber is in the adsorption process A2, then the first adsorber is in the desorption process D, which is A2D; the charging stage of the adsorber corresponds to the charging stage of the pre-adsorber, which is the D1 stage; the desorption stage of the adsorber Corresponding to the pre-adsorption stage of the pre-adsorber, this is the D2 stage; the pre-adsorption stage of the adsorber corresponds to the desorption stage of the pre-adsorber, this is the D3 stage; the pressure replenishing stage of the adsorber corresponds to the pressure replenishing stage of the pre-adsorber, this is the D4 stage; the waiting stage of the adsorber corresponds to the waiting stage of the pre-adsorber, this is the D5 stage; the working state combinations of the two adsorbers and the pre-adsorber are divided into A1D1, A1D2, A1D3, A1D4, A1D5, A2D1, A2D2, A2D3, A2D4, and A2D5 states, and the state switching is realized by the change of the switch state of multiple automatic valves.

[0013] Furthermore, the rated hydrogen adsorption capacity of the adsorber per hour is X1 Nm 3 , the rated adsorption time is N hours, and the single hydrogen adsorption capacity of the adsorber is Y1=N*X1 Nm 3 The initial cumulative flow rate of the hydrogen flow meter at the adsorber outlet at the start of a single adsorption is Y0 Nm 3The actual hydrogen adsorption flow of the adsorber is 0-100% of the rated value. When the cumulative flow of hydrogen flow meter at the adsorber outlet reaches Y2 Nm 3 When Y2=Y0+Y1, the adsorption process is automatically switched to the desorption process, that is, from A1D to A2D or from A2D to A1D.

[0014] Furthermore, stages D1 to D3 are carried out in sequence, and the total duration of the desorption process is W. In stage D1, the adsorber and pre-adsorber in the desorption process are pressurized, and the feedback pressure of the third pressure transmitter at the outlet of the pre-adsorber reaches P1MPa. The duration of stage D1 is W1 and is a non-constant value; the hydrogen self-circulation device and the desorption heater are started, and the self-circulating hydrogen volume is X2 Nm 3 / h, the adsorbent in the pre-adsorber is pre-adsorbed, and the adsorbent in the adsorber is desorbed. The duration of the D2 stage is W2 and is a constant value. After the end of the D2 stage, the D3 stage begins, and the hydrogen self-circulation device and the desorption heater continue to operate. The self-circulating hydrogen volume remains X2 Nm 3 / h, pre-adsorption of adsorbent in the adsorber, desorption of adsorbent in the pre-adsorber, D3 stage duration W3 and is a constant value; after the end of the D3 stage, enter the D5 stage, stop the hydrogen self-circulation device and the desorption heater, the adsorber and pre-adsorber in the desorption process are waiting, D5 stage duration W5 and is non-constant value; wherein, in the D2 and D3 stages, if the feedback pressure of the third pressure transmitter at the outlet of the pre-adsorber is lower than P2MPa, turn off the hydrogen self-circulation device and the desorption heater, the timing of the corresponding stage is stopped, enter the D4 stage, D4 ​​stage duration W4 and is non-constant value, after the pressure is replenished to the feedback pressure of the third pressure transmitter reaches P1MPa, the hydrogen self-circulation device and the desorption heater are automatically started, and the corresponding stage continues to work; wherein, the actual single adsorption time of the adsorber in the adsorption process is Z, Z=W, Z-W5=W1+W2+W3+W4≤N, 0<P2<P1, 0<X2≤X1.

[0015] Furthermore, the adsorbent amount in the first adsorber and the second adsorber is filled with the single adsorption hydrogen amount Y1, and the adsorbent amount in the pre-adsorber is filled with the single pre-adsorption hydrogen amount Y3=W2*X2 Nm 3 Filling, the effective volume of the first adsorber and the second adsorber is greater than the effective volume of the pre-adsorber.

[0016] Furthermore, the liquid outlet of the desorption gas-water separator is connected to the inlet of the water collector through the liquid outlet automatic valve, and the outlet of the water collector is connected to the sewage outlet through the sewage automatic valve. The effective volume of the water collector is V, and the adsorber adsorbs Y1 Nm 3The total amount of water in the hydrogen is V1, where V1 = 1 / 2V; when the adsorber and pre-adsorber in the desorption process just enter the D5 stage, the automatic sewage valve is opened, and the sewage discharge time each time is T1; the liquid outlet automatic valve is normally open, and the liquid outlet automatic valve is closed T2 time before the sewage automatic valve opens, and the liquid outlet automatic valve is opened T2 time after the sewage automatic valve closes.

[0017] Furthermore, in the A1D1 state, the first adsorber is in the adsorption process, and hydrogen enters the first adsorber from the raw hydrogen inlet through the first adsorption air inlet automatic valve for adsorption drying, and the dried hydrogen flows out from the first adsorption air outlet automatic valve, and most of the product hydrogen is output after being pressure-regulated to P1MPa by the self-operated pressure regulating valve, so as to realize the adsorption working flow of the first adsorber being adjustable in the range of 0-100%; the second adsorber is in the pressurization stage of the desorption process, and the pre-adsorber is in the pressurization stage of the pre-adsorption process; when hydrogen is input into the raw hydrogen inlet, a small part of the product hydrogen output by the first adsorber passes through the second adsorption air outlet automatic valve, the second adsorber, the second desorption air outlet automatic valve, the adsorber desorption air outlet automatic switching valve, the desorption cooler, the desorption gas-water separator, the pre-adsorption air inlet automatic switching valve, the pre-adsorber, the pre-adsorption air outlet automatic switching valve, the hydrogen self-circulation device, the desorption heater, the adsorber The adsorbent desorption air inlet automatic switching valve, the second desorption air inlet automatic valve and the connected pipelines are pressurized until the pressure of the third pressure transmitter at the pre-adsorber outlet reaches P1MPa; when there is no hydrogen input at the raw hydrogen inlet, you can choose to wait for the hydrogen input of the first adsorber for internal pressurization and keep the valve state in place, or choose external pressurization, the second adsorption air outlet automatic valve of the second adsorber is closed, and the external high-purity hydrogen or high-purity nitrogen input from the external pressure inlet through the external pressure automatic valve passes through the adsorber desorption air inlet automatic switching valve, the second desorption air inlet automatic valve, the second adsorber, the second desorption air outlet automatic valve, the adsorber desorption air outlet automatic switching valve, the desorption cooler, the desorption gas-water separator, the pre-adsorption air inlet automatic switching valve, the pre-adsorber, the pre-adsorption air outlet automatic switching valve, the hydrogen self-circulation device, the desorption heater and the internally connected pipelines to be pressurized until the pressure of the third pressure transmitter at the pre-adsorber outlet reaches P1MPa.

[0018] Furthermore, in the A1D2 state, after drying in the first adsorber, all the product hydrogen is pressure-regulated to P1MPa by a self-operated pressure regulating valve and then output, so as to realize that the adsorption working flow of the first adsorber is adjustable in the range of 0-100%; the second adsorber is the desorption stage of the desorption process, and the pre-adsorber is the pre-adsorption stage of the pre-adsorption process. The hydrogen self-circulation device and the desorption heater are started, and the gas with a pressure of P1MPa in the pre-adsorption reactor passes through the pre-adsorption outlet automatic switching valve, the hydrogen self-circulation device, and the desorption heater, and then passes through the adsorber desorption inlet automatic switching valve and the second desorption inlet automatic valve to enter the second adsorber to heat and desorb the internal adsorbent, and finally passes through the second desorption outlet automatic valve, the adsorber desorption outlet automatic switching valve, the desorption cooler for cooling, and the desorption gas-water separator for gas-water separation before self-circulation to the pre-adsorber. The self-circulation time is W2, so as to realize that the adsorption process of the first adsorber and the desorption process of the second adsorber are independent of each other. When the adsorption working flow of the first adsorber is in the range of 0-100%, the second adsorber can still complete regeneration.

[0019] Furthermore, in the A1D3 state, after drying in the first adsorber, all the product hydrogen is pressure-regulated to P1MPa by a self-operated pressure regulating valve and then output, so as to realize that the adsorption working flow of the first adsorber is adjustable in the range of 0-100%; the second adsorber is the adsorption stage of the desorption process, and the pre-adsorber is the desorption stage of the pre-adsorption process. The hydrogen self-circulation device and the desorption heater are in operation. The gas with a pressure of P1MPa in the second adsorber is heated by the second desorption air inlet automatic valve, the pre-adsorption air outlet automatic valve, the hydrogen self-circulation device, and the desorption heater, and then enters the pre-adsorber through the desorption air inlet automatic switching valve to heat and desorb the internal adsorbent. Finally, it is cooled by the desorption air outlet automatic switching valve and the desorption cooler, and separated by air and water in the desorption gas-water separator, and then self-circulated to the second adsorber through the pre-adsorption air inlet automatic valve and the second desorption air outlet automatic valve. The self-circulation time is W3, so as to realize that the adsorption process of the first adsorber and the desorption process of the pre-adsorber are independent of each other. In the adsorption working flow range of the first adsorber 0-100%, the pre-adsorber can still complete regeneration.

[0020] Furthermore, in the A1D4 state, all the product hydrogen after drying in the first adsorber is output after being pressure-regulated to P1MPa by the self-operated pressure regulating valve, so as to realize the adsorption working flow of the first adsorber being adjustable in the range of 0-100%; the second adsorber is the pressure-replenishing stage of the desorption process, and the pre-adsorber is the pressure-replenishing stage of the pre-adsorption process; in the D2 and D3 stages, if the feedback pressure of the third pressure transmitter is lower than P2MPa, the hydrogen self-circulation device and the desorption heater are closed, the timing of the corresponding stage is stopped, and the second adsorption gas outlet automatic valve or the external pressure filling automatic valve is opened for pressure replenishment. The states of other valves remain in place. After the pressure is replenished to the feedback pressure of the third pressure transmitter reaching P1MPa, the second adsorption gas outlet automatic valve or the external pressure filling automatic valve is closed, and the hydrogen self-circulation device and the desorption heater are automatically started to continue working.

[0021] Furthermore, in the A1D5 state, all the product hydrogen after drying in the first adsorber is output after being pressure-regulated to P1MPa by the self-operated pressure regulating valve, so as to realize the adsorption working flow of the first adsorber being adjustable in the range of 0-100%; the second adsorber is in the waiting stage of the desorption process, and the pre-adsorber is in the waiting stage of the pre-adsorption process, the hydrogen self-circulation device and the desorption heater are stopped, the valve state remains in place, and the waiting time is W5.

[0022] Furthermore, in the A2D1 state, the second adsorber is in the adsorption process, and hydrogen enters the second adsorber from the raw hydrogen inlet through the second adsorption air inlet automatic valve for adsorption drying, and the dried hydrogen flows out from the second adsorption air outlet automatic valve, and most of the product hydrogen is output after adjusting the pressure to P1 MPa by the self-operated pressure regulating valve, so as to realize the adsorption working flow of the second adsorber adjustable in the range of 0-100%; the first adsorber is in the pressurization stage of the desorption process, and the pre-adsorber is in the pressurization stage of the pre-adsorption process; when hydrogen is input into the raw hydrogen inlet, a small part of the product hydrogen output by the second adsorber is pressurized through the first adsorption air outlet automatic valve, the first adsorber, the first desorption air outlet automatic valve, the adsorber desorption air outlet automatic switching valve, the desorption cooler, the desorption gas-water separator, the pre-adsorption air inlet automatic switching valve, the pre-adsorption device, the desorption heater, the adsorber desorption air inlet automatic switching valve, the first desorption air inlet automatic valve and the connected pipelines, and the pressure of the third pressure transmitter at the pre-adsorber outlet reaches P1MPa; when there is no hydrogen input at the raw hydrogen inlet, you can choose to wait for the hydrogen input from the second adsorber for internal pressurization and keep the valve state in place, or choose external pressurization, the first adsorption outlet automatic valve of the first adsorber is closed, and the external high-purity hydrogen or high-purity nitrogen input from the external pressure inlet through the external pressure automatic valve passes through the adsorber desorption inlet automatic switching valve, the first desorption inlet automatic valve, the first adsorber, the first desorption outlet automatic valve, the adsorber desorption outlet automatic switching valve, the desorption cooler, the desorption gas-water separator, the pre-adsorption inlet automatic switching valve, the pre-adsorber, the pre-adsorption outlet automatic switching valve, the hydrogen self-circulation device, the desorption heater and the internally connected pipelines to be pressurized, and the pressure of the third pressure transmitter at the outlet of the pre-adsorber reaches P1MPa.

[0023] Furthermore, in the A2D2 state, all the product hydrogen after drying in the second adsorber is pressure-regulated to P1MPa by a self-operated pressure regulating valve and then output, so as to realize that the adsorption working flow of the second adsorber is adjustable in the range of 0-100%; the first adsorber is the desorption stage of the desorption process, and the pre-adsorber is the pre-adsorption stage of the pre-adsorption process. The hydrogen self-circulation device and the desorption heater are started. The gas with a pressure of P1MPa in the pre-adsorption reactor passes through the pre-adsorption outlet automatic switching valve, the hydrogen self-circulation device, and the desorption heater, and then passes through the adsorber desorption inlet automatic switching valve and the first desorption inlet automatic valve to enter the first adsorber to heat and desorb the internal adsorbent. Finally, it passes through the first desorption outlet automatic valve, the adsorber desorption outlet automatic switching valve, the desorption cooler for cooling, and the desorption gas-water separator for gas-water separation before self-circulation to the pre-adsorber. The self-circulation time is W2, so as to realize that the adsorption process of the second adsorber is independent of the desorption process of the first adsorber. When the adsorption working flow of the second adsorber is in the range of 0-100%, the first adsorber can still complete regeneration.

[0024] Furthermore, in the A2D3 state, all the product hydrogen after drying in the second adsorber is pressure-regulated to P1MPa by a self-operated pressure regulating valve and then output, so as to realize that the adsorption working flow of the second adsorber is adjustable in the range of 0-100%; the first adsorber is the adsorption stage of the desorption process, and the pre-adsorber is the desorption stage of the pre-adsorption process. The hydrogen self-circulation device and the desorption heater are in operation. The gas with a pressure of P1MPa in the first adsorber is heated by the first desorption air inlet automatic valve, the pre-adsorption air outlet automatic valve, the hydrogen self-circulation device, and the desorption heater, and then enters the pre-adsorber through the desorption air inlet automatic switching valve to heat and desorb the internal adsorbent. Finally, it is cooled by the desorption air outlet automatic switching valve and the desorption cooler, and separated by air and water in the desorption gas-water separator, and then self-circulated to the first adsorber through the pre-adsorption air inlet automatic valve and the first desorption air outlet automatic valve. The self-circulation time is W3, so as to realize that the adsorption process of the second adsorber and the desorption process of the pre-adsorber are independent of each other. In the adsorption working flow range of the second adsorber 0-100%, the pre-adsorber can still complete regeneration.

[0025] Furthermore, in the A2D4 state, all the product hydrogen after drying in the second adsorber is output after being pressure-regulated to P1MPa by the self-operated pressure regulating valve, so as to realize the adsorption working flow of the second adsorber adjustable in the range of 0-100%; the first adsorber is the pressure replenishing stage of the desorption process, and the pre-adsorber is the pressure replenishing stage of the pre-adsorption process; in the D2 and D3 stages, if the feedback pressure of the third pressure transmitter is lower than P2MPa, the hydrogen self-circulation device and the desorption heater are closed, the timing of the corresponding stage is stopped, and the first adsorption gas outlet automatic valve or the external pressure filling automatic valve is opened for pressure replenishment. The other valve states remain in place. After the pressure is replenished to the feedback pressure of the third pressure transmitter reaching P1MPa, the first adsorption gas outlet automatic valve or the external pressure filling automatic valve is closed, and the hydrogen self-circulation device and the desorption heater are automatically started to continue working.

[0026] Furthermore, in the A2D5 state, all the product hydrogen after drying in the second adsorber is output after being pressure-regulated to P1MPa by the self-operated pressure regulating valve, so as to realize the adsorption working flow of the second adsorber adjustable in the range of 0-100%; the first adsorber is in the waiting stage of the desorption process, and the pre-adsorber is in the waiting stage of the pre-adsorption process. The hydrogen self-circulation device and the desorption heater are stopped, the valve state remains in place, and the waiting time is W5.

[0027] Applying the technical solution of the present application, a hydrogen drying system for producing hydrogen from renewable energy is provided, comprising two adsorbers, a pre-adsorber, a hydrogen self-circulation device, a desorption heater, a desorption cooler and a desorption gas-water separator; wherein the two adsorbers are arranged in parallel, and the two adsorbers alternately perform adsorption and desorption processes, the adsorption flow of the adsorber varies with the fluctuation of the input renewable energy, and the working state of the adsorber is switched by accumulating the hydrogen flow processed by the adsorber in a single adsorption process; the pre-adsorber is connected in series with one of the adsorbers to assist the desorption process; the desorption process circulates the hydrogen in the pre-adsorber or adsorber through the hydrogen self-circulation device, and is independent of the adsorption process, and dry hydrogen is directly output after the adsorption process is completed; the desorption heater is connected to the outlet of the hydrogen self-circulation device to heat the hydrogen output by the hydrogen self-circulation device; the inlet of the desorption cooler is connected to the adsorber or the pre-adsorber, and the outlet is connected to the desorption gas-water separator, which is used to condense water vapor entrained in the hydrogen in the desorption process, and separate hydrogen and liquid water through the desorption gas-water separator, and the hydrogen outlet of the desorption gas-water separator is connected to the adsorber or the pre-adsorber. In this solution, the adsorption and desorption processes are independent. The feed gas enters the adsorber and is fully discharged after adsorption. During the desorption process, a hydrogen self-circulation device circulates hydrogen within the pre-adsorber or adsorber to regenerate hydrogen. This effectively solves the problem of incomplete desorption caused by fluctuations in the feed hydrogen flow rate, resulting in interruptions and interruptions. This solution is particularly well-suited for intermittent and fluctuating renewable energy hydrogen production. This innovatively optimized design allows the system to operate at a 0-100% renewable energy load.

[0028] The hydrogen drying system for renewable energy hydrogen production is designed to dry all hydrogen produced under intermittent or fluctuating renewable energy conditions. This system can be started and stopped according to the characteristics of the renewable energy source, enabling the adsorber to produce pure hydrogen within the operating flow range of 0-100%. The regenerated adsorber and regenerated pre-adsorber can independently regenerate within the operating flow range of 0-100%, ensuring thorough regeneration and maintaining adsorption capacity at any time after the adsorber switches from desorption to adsorption. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings that constitute part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0030] FIG1 shows a schematic diagram of a hydrogen drying system for producing hydrogen from renewable energy provided by the present application;

[0031] FIG2 is a schematic diagram of the first adsorber adsorption, the second adsorber pressurization, and the pre-adsorber pressurization in the A1D1 state of the present application;

[0032] FIG3 is a schematic diagram of the first adsorber adsorbing, the second adsorber desorbing, and the pre-adsorber pre-adsorbing in the A1D2 state of the present application;

[0033] FIG4 is a schematic diagram of the first adsorber adsorption, the second adsorber pre-adsorption, and the pre-adsorber desorption in the A1D3 state of the present application;

[0034] FIG5 is a schematic diagram of the second adsorber adsorption, the first adsorber pressurization, and the pre-adsorber pressurization in the A2D1 state of the present application;

[0035] FIG6 is a schematic diagram of the second adsorber adsorbing, the first adsorber desorbing, and the pre-adsorber pre-adsorbing in the A2D2 state of the present application;

[0036] FIG7 is a schematic diagram of the second adsorber adsorption, the first adsorber pre-adsorption, and the pre-adsorber desorption in the A2D3 state of the present application;

[0037] FIG8 is a schematic diagram of a self-circulation unit in the hydrogen self-circulation device in FIG1 .

[0038] In which, the above drawings include the following figure marks: 01, raw material hydrogen inlet; 02, product hydrogen outlet; 03, hydrogen vent; 04, cooling water outlet; 05, cooling water inlet; 06, sewage outlet; 07, external pressure inlet; 1, first adsorber; 11, first adsorption air inlet automatic valve; 12, first adsorption air outlet automatic valve; 13, first desorption air outlet automatic valve; 14, first desorption air inlet automatic valve; 15, pre-adsorption air inlet automatic valve; 16, pre-adsorption air outlet automatic valve; 17, first pressure transmitter; 2, second adsorber; 21, second adsorption air inlet automatic valve; 22, second adsorption air outlet automatic valve; 23, second desorption air outlet automatic valve; 24, second desorption air inlet automatic valve; 25, adsorber desorption air outlet automatic switching valve; 26, adsorber desorption air inlet automatic switching valve; 27, second pressure transmitter; 3. Pre-adsorber; 31. Pre-adsorption air inlet automatic switching valve; 32. Desorption air inlet automatic switching valve; 33. Desorption air outlet automatic switching valve; 34. Pre-adsorption air outlet automatic switching valve; 35. Third pressure transmitter; 4. Hydrogen self-circulation device; 41. First self-circulation unit; 42. Second self-circulation unit; 43. Third self-circulation unit; 411. First inlet shut-off valve; 412. First self-circulation equipment; 413. First outlet check valve; 414. First outlet shut-off valve; 421. Second inlet shut-off valve; 422. Second self-circulation equipment; 423. Second outlet check valve; 424. Second outlet shut-off valve; 431. Third inlet shut-off valve; 432. Third self-circulation equipment; 433. Third outlet check valve; 434. Third outlet shut-off valve; 5. Desorption heater; 6. Desorption cooler; 7. Desorption gas-water separator; 71. Liquid outlet automatic valve; 8. Water collector; 81. Automatic sewage discharge valve; 91. Self-operated pressure regulating valve; 92. Hydrogen flow meter; 93. Hydrogen dew point meter; 94. Automatic product hydrogen valve; 95. Automatic hydrogen venting valve; 96. Automatic external pressure charging valve. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the 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. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0040] As shown in Figures 1 to 8, the embodiment of the present application provides a hydrogen drying system for renewable energy hydrogen production, characterized in that it includes two adsorbers, a pre-adsorber 3, a hydrogen self-circulating device 4, a desorption heater 5, a desorption cooler 6 and a desorption gas-water separator 7; wherein the two adsorbers are arranged in parallel, and the two adsorbers alternately perform adsorption and desorption processes, and the adsorption flow of the adsorber varies with the fluctuation of the input renewable energy, and the working state of the adsorber is switched by accumulating the single adsorption process of the adsorber to process the hydrogen flow; the pre-adsorber 3 is connected in series with one of the adsorbers to assist in the desorption process. Adsorption process; the desorption process circulates the hydrogen in the pre-adsorber 3 or the adsorber through the hydrogen self-circulation device 4, and is independent of the adsorption process. After the adsorption process is completed, dry hydrogen is directly output; the desorption heater 5 is connected to the outlet of the hydrogen self-circulation device 4 to heat the hydrogen output by the hydrogen self-circulation device 4; the inlet of the desorption cooler 6 is connected to the adsorber or pre-adsorber 3, and the outlet is connected to the desorption gas-water separator 7, which is used to condense the water vapor entrained in the hydrogen in the desorption process, and separate the hydrogen and liquid water through the desorption gas-water separator 7, and the hydrogen outlet of the desorption gas-water separator 7 is connected to the adsorber or pre-adsorber 3.

[0041] In this solution, the adsorption and desorption processes are independent of each other. The feed gas enters the adsorber and is completely discharged after adsorption is completed. The desorption process uses a hydrogen self-circulation device 4 to circulate hydrogen from the pre-adsorber 3 or the adsorber to achieve hydrogen regeneration. This effectively solves the problem of incomplete desorption caused by fluctuations in the feed hydrogen flow rate, leading to interruptions and interruptions. This solution is particularly suitable for intermittent and fluctuating hydrogen production from renewable energy. Furthermore, this solution switches the adsorber's operating state by accumulating the hydrogen flow during a single adsorption process, rather than switching the adsorber's operating state periodically. This innovatively optimized design allows the system to meet the 0-100% load requirement for renewable energy hydrogen production. It also avoids regenerating the adsorber before it is saturated, which reduces the frequency of heating and desorption, reduces energy consumption, and ensures effective desorption and drying.

[0042] The desorption process is further divided into the following phases: pressurization, desorption, pre-adsorption, pressure replenishment, and waiting. Each phase is achieved through program-controlled, intelligent automatic valve switching. The pre-adsorption process is further divided into the following phases: pressurization, pre-adsorption, desorption, pressure replenishment, and waiting. Each phase is achieved through program-controlled, intelligent automatic valve switching. The desorption heater 5, consisting of an internal electric heating core and a container, is used to heat the hydrogen output by the hydrogen self-circulation device 4 for desorption of the adsorbent within the adsorber.

[0043] The two adsorbers are respectively a first adsorber 1 and a second adsorber 2. The inlet of the first adsorber 1 is connected to the raw hydrogen inlet 01 through a first adsorption air inlet automatic valve 11. The inlet of the first adsorber 1 is connected through a first desorption air outlet automatic valve 13, a pre-adsorption air inlet automatic valve 15 and a pre-adsorber 3 which are arranged in sequence. The outlet of the first adsorber 1 is connected to a first adsorption air outlet automatic valve 12 for discharging hydrogen. The outlet of the first adsorber 1 is connected to a hydrogen self-circulating device 4 and a pre-adsorber 3 through a first desorption air inlet automatic valve 14 and a first pre-adsorption air outlet automatic valve 16 which are arranged in sequence. The inlet of the second adsorber 2 is connected to the raw hydrogen inlet 01 through a second adsorption air inlet automatic valve 21. The inlet of the second adsorber 2 is connected to a first adsorption air outlet automatic valve 12 for discharging hydrogen. The outlet of the second adsorber 2 is connected to the second adsorption outlet automatic valve 22 for discharging hydrogen through the second desorption air inlet automatic valve 24 and the adsorber desorption air inlet automatic switching valve 26 which are arranged in sequence; wherein, the two adsorbers share a pre-adsorption air inlet automatic valve 15, a pre-adsorption air outlet automatic valve 16, an adsorber desorption air inlet automatic switching valve 26 and an adsorber desorption air outlet automatic switching valve 25; the outlet of the first adsorber 1 is connected to the first pressure transmitter 17, and the outlet of the second adsorber 2 is connected to the second pressure transmitter 27.

[0044] As shown in Figure 1, the inlet of the pre-adsorber 3 is connected to the pre-adsorption air intake automatic switching valve 31 and the pre-adsorption air intake automatic valve 15, the inlet of the pre-adsorber 3 is connected to the desorption cooler 6 through the desorption air outlet automatic switching valve 33, the outlet of the pre-adsorber 3 is connected to the external charging inlet 07 through the desorption air intake automatic switching valve 32, the outlet of the pre-adsorber 3 is connected to the hydrogen self-circulation device 4 and the pre-adsorption air outlet automatic switching valve 16 through the pre-adsorption air outlet automatic switching valve 34, and the outlet of the pre-adsorber 3 is connected to the third pressure transmitter 35.

[0045] The inlet of the hydrogen self-circulation device 4 is connected to the pre-adsorber 3 or the adsorber. The hydrogen self-circulation device 4 includes multiple sets of self-circulation units. When the working flow of a single set of self-circulation units does not meet the desorption flow demand, multiple sets of self-circulation units are operated in parallel; each set of self-circulation units includes a self-circulation inlet shut-off valve, a self-circulation device, a self-circulation outlet check valve and a self-circulation outlet shut-off valve connected in sequence. After passing through the hydrogen self-circulation device, the pressure is increased by ΔP MPa, preferably ΔP is 0.2 MPa. The outlet check valve can effectively prevent the backflow of hot gas in the desorption heater 5 from affecting the service life of the self-circulation equipment. The self-circulation equipment is preferably a gas-driven hydrogen booster pump, but is not limited to a hydrogen circulation pump, a diaphragm compressor, a booster valve, etc.

[0046] As shown in Figure 8, multiple sets of self-circulation units include a first self-circulation unit 41, a second self-circulation unit 42 and a third self-circulation unit 43. The first self-circulation unit 41 includes a first inlet shut-off valve 411, a first self-circulation device 412, a first outlet check valve 413, and a first outlet shut-off valve 414 connected in sequence; the second self-circulation unit 42 includes a second inlet shut-off valve 421, a second self-circulation device 422, a second outlet check valve 423, and a second outlet shut-off valve 424 connected in sequence; the third self-circulation unit 43 includes a third inlet shut-off valve 431, a third self-circulation device 432, a third outlet check valve 433, and a third outlet shut-off valve 434 connected in sequence.

[0047] In this solution, the hydrogen drying system for renewable energy hydrogen production also includes a raw hydrogen inlet 01, a product hydrogen outlet 02, a hydrogen venting port 03, a cooling water outlet 04, a cooling water inlet 05, a sewage outlet 06, an external pressure inlet 07 and a water collector 8; wherein the raw hydrogen inlet 01 is connected to the inlet of the adsorber, the product hydrogen outlet 02 is connected to the outlet of the adsorber through the product hydrogen automatic valve 94, the hydrogen venting port 03 is connected to the outlet of the adsorber through the hydrogen venting automatic valve 95, and the adsorber is connected to the outlet of the adsorber. The pipeline connected to the product hydrogen outlet 02 is equipped with a self-operated pressure regulating valve 91, a hydrogen flowmeter 92 and a hydrogen dew point meter 93. The cooling water inlet 05 and the cooling water outlet 04 are both connected to the desorption cooler 6. The external pressure inlet 07 is connected to the adsorber and the pre-adsorber 3 through the external pressure automatic valve 96. The liquid outlet of the desorption gas-water separator 7 is connected to the inlet of the water collector 8 through the liquid outlet automatic valve 71, and the outlet of the water collector 8 is connected to the sewage outlet 06 through the sewage automatic valve 81.

[0048] After the dry hydrogen is pressure-regulated by the self-operated pressure regulating valve 91, it is sampled and analyzed by the hydrogen dew point meter 93 and then judged by the intelligent control system. If the dew point is qualified, it is output through the product hydrogen automatic valve 94. If the dew point is unqualified, it is discharged through the hydrogen venting automatic valve 95.

[0049] In the hydrogen drying system for renewable energy hydrogen production, the desorption process includes a pressurization stage, a desorption stage, a pre-adsorption stage, a waiting stage, and a pressure replenishing stage. The pre-adsorption process of the pre-adsorber 3 includes a pressurization stage, a pre-adsorption stage, a desorption stage, a pressure replenishing stage, and a waiting stage. The two adsorbers are the first adsorber 1 and the second adsorber 2. If the first adsorber 1 is in the adsorption process A1, then the second adsorber 2 is in the desorption process D, which is A1D; if the second adsorber 2 is in the adsorption process A2, then the first adsorber 1 is in the desorption process D, which is A2D; the pressurization stage of the adsorber corresponds to the pressurization stage of the pre-adsorber 3, which is the D1 stage. ; The desorption stage of the adsorber corresponds to the pre-adsorption stage of the pre-adsorber 3, which is the D2 stage; the pre-adsorption stage of the adsorber corresponds to the desorption stage of the pre-adsorber 3, which is the D3 stage; the pressure replenishing stage of the adsorber corresponds to the pressure replenishing stage of the pre-adsorber 3, which is the D4 stage; the waiting stage of the adsorber corresponds to the waiting stage of the pre-adsorber 3, which is the D5 stage; the working state combinations of the two adsorbers and the pre-adsorber 3 are divided into A1D1, A1D2, A1D3, A1D4, A1D5, A2D1, A2D2, A2D3, A2D4, and A2D5 states, and the switching of each state is realized by changing the switch states of multiple automatic valves.

[0050] In this scheme, the adsorber adsorption flow rate fluctuates with renewable energy. The control system switches the working state of the adsorber by accumulating the hydrogen flow rate processed by the adsorber in a single adsorption process, which can effectively avoid frequent heating and desorption before the adsorber is saturated, resulting in energy loss. The rated hydrogen adsorption capacity of the adsorber per hour is X1 Nm 3 , the rated adsorption time is N hours, and the single hydrogen adsorption capacity of the adsorber is Y1=N*X1 Nm 3 The initial cumulative flow rate of the hydrogen flowmeter 92 at the outlet of the adsorber is Y0 Nm 3 , the actual hydrogen adsorption flow of the adsorber is 0-100% of the rated value, when the cumulative flow of hydrogen flow meter 92 at the adsorber outlet reaches Y2Nm 3 When Y2=Y0+Y1, the adsorption process is automatically switched to the desorption process, that is, from A1D to A2D or from A2D to A1D.

[0051] Stages D1 to D3 are carried out in sequence, and the total duration of the desorption process is W. In stage D1, the adsorber and pre-adsorber 3 in the desorption process are pressurized, and the feedback pressure of the third pressure transmitter 35 at the outlet of the pre-adsorber 3 reaches P1MPa. The duration of stage D1 is W1 and is a non-constant value; the hydrogen self-circulation device 4 and the desorption heater 5 are started, and the amount of self-circulating hydrogen is X2 Nm 3 / h, the adsorbent in the pre-adsorber 3 is pre-adsorbed, and the adsorbent in the adsorber is desorbed. The duration of the D2 stage is W2 and is a constant value. After the end of the D2 stage, the D3 stage begins, and the hydrogen self-circulation device 4 and the desorption heater 5 continue to operate. The self-circulating hydrogen volume remains X2 Nm 3 / h, the adsorbent in the adsorber is pre-adsorbed, and the adsorbent in the pre-adsorber 3 is desorbed, and the D3 stage lasts W3 and is a constant value; after the end of the D3 stage, the D5 stage is entered, the hydrogen self-circulation device 4 and the desorption heater 5 are stopped, and the adsorber and the pre-adsorber 3 in the desorption process are all waiting, and the D5 stage lasts W5 and is a non-constant value; wherein, in the D2 and D3 stages, if the feedback pressure of the third pressure transmitter 35 at the outlet of the pre-adsorber 3 is lower than P2MPa, the hydrogen self-circulation device 4 and the desorption heater 5 are turned off, the timing of the corresponding stage is stopped, and the D4 stage is entered. The D4 stage lasts W4 and is a non-constant value. After the pressure is replenished to the feedback pressure of the third pressure transmitter 35 reaching P1MPa, the hydrogen self-circulation device 4 and the desorption heater 5 are automatically started, and the corresponding stage continues to work; Among them, the actual single adsorption time of the adsorber in the adsorption process is Z, Z=W, Z-W5=W1+W2+W3+W4≤N, 0<P2<P1, 0<X2≤X1.

[0052] The adsorbent amount in the first adsorber 1 and the second adsorber 2 is filled with a single adsorption hydrogen amount Y1, and the adsorbent amount in the pre-adsorber 3 is filled with a single pre-adsorption hydrogen amount Y3 = W2*X2 Nm 3 Filling: The effective volume of the first adsorber 1 and the second adsorber 2 is greater than the effective volume of the pre-adsorber 3. The first adsorber 1 and the second adsorber 2 have the same adsorbent filling amount, while the adsorbent filling amount of the pre-adsorber 3 is less than that of the first adsorber 1 and the second adsorber 2, that is, the effective volume of the first adsorber 1 and the second adsorber 2 is greater than that of the pre-adsorber 3.

[0053] The liquid outlet of the desorption gas-water separator 7 is connected to the inlet of the water collector 8 through the liquid outlet automatic valve 71, and the outlet of the water collector 8 is connected to the sewage outlet 06 through the sewage automatic valve 81. The effective volume of the water collector 8 is V, and the adsorber adsorbs Y1 Nm 3 The total amount of water in the hydrogen is V1, where V1 = 1 / 2V, which can ensure that the liquid level in the water collector 8 will not be too high during a single desorption cycle; when the adsorber and pre-adsorber 3 in the desorption process just enter the D5 stage, the automatic sewage discharge valve 81 is opened, and the sewage discharge time each time is T1; the liquid outlet automatic valve 71 is normally open. In order to avoid pressure fluctuations in the pre-adsorber 3 and the adsorber during the sewage discharge process, the liquid outlet automatic valve 71 is closed T2 time before the sewage discharge automatic valve 81 is opened, and the liquid outlet automatic valve 71 is opened T2 time after the sewage discharge automatic valve 81 is closed.

[0054] As shown in Figure 2, in the A1D1 state, the first adsorber 1 is in the adsorption process. Hydrogen enters the first adsorber 1 from the raw hydrogen inlet 01 through the first adsorption inlet automatic valve 11 for adsorption drying. The dried hydrogen flows out through the first adsorption outlet automatic valve 12. The majority of the product hydrogen is pressure-regulated to P1 MPa by the self-operated pressure regulating valve 91 before being output, achieving an adjustable adsorption flow rate of 0-100% in the first adsorber 1. There are two pressurization methods: internal and external, with internal pressure being preferred. The second adsorber 2 is the pressurization stage in the desorption process, and the pre-adsorber 3 is the pressurization stage in the pre-adsorption process; when there is hydrogen input to the raw hydrogen inlet 01, that is, the instantaneous flow rate of the hydrogen flowmeter at the adsorber outlet is not 0, the internal pressurized gas source is a small part of the product hydrogen output by the first adsorber 1, through the second adsorption outlet automatic valve 22, the second adsorber 2, the second desorption outlet automatic valve 23, the adsorber desorption outlet automatic switching valve 25, the desorption cooler 6, the desorption gas-water separator 7, the pre-adsorption inlet automatic switching valve 31, the pre-adsorption device 3, the pre-adsorption outlet automatic switching valve 34, the hydrogen self-circulation device 4, the desorption heater 5, the adsorber desorption inlet automatic switching valve 26, the second desorption inlet automatic valve 24 and the connected pipelines, and the pressure at the third pressure transmitter 35 at the outlet of the pre-adsorber 3 reaches P1MPa; when there is no hydrogen input to the raw hydrogen inlet 01, that is, the instantaneous flow rate of the hydrogen flowmeter at the adsorber outlet is not 0, the internal pressurized gas source is a small part of the product hydrogen output by the first adsorber 1, and the pressure at the third pressure transmitter 35 at the outlet of the pre-adsorber 3 reaches P1MPa. Gas input, that is, the instantaneous flow of the hydrogen flowmeter 92 at the adsorber outlet is 0. You can choose to wait for the hydrogen input to the first adsorber 1 and internally pressurize while the valve state remains in place, or choose external pressurization. The second adsorption outlet automatic valve 22 of the second adsorber 2 is closed, and the external high-purity hydrogen or high-purity nitrogen input from the external pressure inlet 07 through the external pressure automatic valve 96 is pressurized through the adsorber desorption air inlet automatic switching valve 26, the second desorption air inlet automatic valve 24, the second adsorber 2, the second desorption air outlet automatic valve 23, the adsorber desorption air outlet automatic switching valve 25, the desorption cooler 6, the desorption gas-water separator 7, the pre-adsorption air inlet automatic switching valve 31, the pre-adsorber 3, the pre-adsorption air outlet automatic switching valve 34, the hydrogen self-circulation device 4, the desorption heater 5 and the internally connected pipelines, and the pressure of the third pressure transmitter 35 at the outlet of the pre-adsorber 3 reaches P1MPa.

[0055] As shown in Figure 3, in the A1D2 state, the first adsorber 1 is in the adsorption process, the second adsorber 2 is in the desorption stage of the desorption process, and the pre-adsorber 3 is in the pre-adsorption stage of the pre-adsorption process. After the first adsorber 1 is dried, all the product hydrogen is output after the pressure is adjusted to P1MPa by the self-operated pressure regulating valve 91, so as to achieve the adsorption working flow of the first adsorber 1 adjustable in the range of 0-100%; the second adsorber 2 is in the desorption stage of the desorption process, and the pre-adsorber 3 is in the pre-adsorption stage of the pre-adsorption process. The hydrogen self-circulation device 4 and the desorption heater 5 are started, and the gas with a pressure of P1MPa in the pre-adsorption gas outlet automatic switching valve 34, the hydrogen self-circulation device 4, and the desorption heater 5 are then passed through the adsorber desorption inlet self-circulation device 4. The air enters the second adsorber 2 through the automatic switching valve 26 and the second desorption air inlet automatic valve 24 to heat and desorb the internal adsorbent, and finally passes through the second desorption air outlet automatic valve 23, the adsorber desorption air outlet automatic switching valve 25, the desorption cooler 6 for cooling, and the desorption air-water separator 7 for air-water separation, and then self-circulates to the pre-adsorber 3. The self-circulation time is W2, so as to realize that the adsorption process of the first adsorber 1 and the desorption process of the second adsorber 2 are independent of each other. When the adsorption working flow of the first adsorber 1 is in the range of 0-100%, the second adsorber 2 can still complete regeneration.

[0056] As shown in Figure 4, in the A1D3 state, the first adsorber 1 is in the adsorption process, the second adsorber 2 is in the adsorption stage of the desorption process, and the pre-adsorber 3 is in the desorption stage of the pre-adsorption process. After drying in the first adsorber 1, all the product hydrogen is output after the pressure is adjusted to P1MPa by the self-operated pressure regulating valve 91, so as to achieve the adsorption working flow of the first adsorber 1 adjustable in the range of 0-100%; the second adsorber 2 is in the adsorption stage of the desorption process, the pre-adsorber 3 is in the desorption stage of the pre-adsorption process, the hydrogen self-circulation device 4 and the desorption heater 5 are in operation, and the gas with a pressure of P1MPa in the second adsorber 2 is heated by the second desorption air inlet automatic valve 24, the pre-adsorption air outlet automatic valve 16, the hydrogen self-circulation device 4, and the desorption heater 5, and then The air enters the pre-adsorber 3 through the desorption air inlet automatic switching valve 32 to heat and desorb the internal adsorbent. Finally, it passes through the desorption air outlet automatic switching valve 33 and the desorption cooler 6 for cooling, and the desorption air-water separator 7 for air-water separation. Then, it self-circulates to the second adsorber 2 through the pre-adsorption air inlet automatic valve 15 and the second desorption air outlet automatic valve 23. The self-circulation time is W3, so that the adsorption process of the first adsorber 1 and the desorption process of the pre-adsorber 3 are independent of each other. When the adsorption working flow of the first adsorber 1 is in the range of 0-100%, the pre-adsorber 3 can still complete regeneration.

[0057] In states A1D4, referring to Figures 3 and 4, the first adsorber 1 is in the adsorption process, the second adsorber 2 is in the desorption process, and the pre-adsorber 3 is in the pre-adsorption process. After drying in the first adsorber 1, all product hydrogen is pressure-regulated to P1 MPa by the self-operated pressure regulating valve 91 before being output, enabling the adsorption flow rate of the first adsorber 1 to be adjustable within a range of 0-100%. The second adsorber 2 is in the desorption process, and the pre-adsorber 3 is in the pre-adsorption process. In stages D2 and D3, if the feedback pressure from the third pressure transmitter 35 is lower than P2 MPa, the hydrogen self-circulating device 4 and the desorption heater 5 are shut down, the timing for the corresponding stage is stopped, and the second adsorption outlet automatic valve 22 or the external pressure automatic valve 96 is opened for pressure replenishment. The other valves remain in their original positions. After the feedback pressure from the third pressure transmitter 35 reaches P1 MPa, the second adsorption outlet automatic valve 22 or the external pressure automatic valve 96 is closed, and the hydrogen self-circulating device 4 and the desorption heater 5 are automatically restarted to resume operation.

[0058] In state A1D5, referring to Figure 4 , the first adsorber 1 is in the adsorption process, the second adsorber 2 is in the desorption waiting phase, and the pre-adsorber 3 is in the pre-adsorption waiting phase. After drying in the first adsorber 1, all product hydrogen is pressure-regulated to P1 MPa by the self-operated pressure regulating valve 91 before being output, enabling the adsorption flow rate of the first adsorber 1 to be adjustable within a range of 0-100%. The second adsorber 2 is in the desorption waiting phase, and the pre-adsorber 3 is in the pre-adsorption waiting phase. The hydrogen self-circulating device 4 and the desorption heater 5 are deactivated, and the valves remain in their original positions. The waiting period is W5.

[0059] As shown in Figure 5, in the A2D1 state, the second adsorber 2 is in the adsorption process, and hydrogen enters the second adsorber 2 from the raw hydrogen inlet 01 through the second adsorption air inlet automatic valve 21 for adsorption drying. The dried hydrogen flows out from the second adsorption air outlet automatic valve 22, and most of the product hydrogen is output after being pressure-regulated to P1 MPa by the self-operated pressure regulating valve 91, so as to achieve the adsorption working flow of the second adsorber 2 adjustable in the range of 0-100%; the first adsorber 1 is the pressurization stage of the desorption process, and the pre-adsorber 3 is the pressurization stage of the pre-adsorption process; the pressurization mode is divided into internal pressurization and external pressurization, and internal pressurization is preferred. When there is hydrogen input to the raw hydrogen inlet 01, that is, the instantaneous flow rate of the adsorber outlet hydrogen flowmeter 92 is not 0, the internal pressurized gas source is a small portion of the product hydrogen output from the second adsorber 2, which is pressurized through the first adsorption outlet automatic valve 12, the first adsorber 1, the first desorption outlet automatic valve 13, the adsorber desorption outlet automatic switching valve 25, the desorption cooler 6, the desorption gas-water separator 7, the pre-adsorption inlet automatic switching valve 31, the pre-adsorber 3, the pre-adsorption outlet automatic switching valve 34, the hydrogen self-circulation device 4, the desorption heater 5, the adsorber desorption inlet automatic switching valve 26, the first desorption inlet automatic valve 14 and the connected pipelines to the third pressure transmitter 35 at the outlet of the pre-adsorber 3 to reach P1MPa; when there is no hydrogen input to the raw hydrogen inlet 01, that is, the adsorber outlet hydrogen flowmeter 9 2 instantaneous flow rate is 0. You can choose to wait for the second adsorber 2 to be internally pressurized while the hydrogen is input and the valve state remains in place, or choose external pressurization. The first adsorption outlet automatic valve 12 of the first adsorber 1 is closed, and the external high-purity hydrogen or high-purity nitrogen input from the external pressure inlet 07 through the external pressure automatic valve 96 is pressurized through the adsorber desorption inlet automatic switching valve 26, the first desorption inlet automatic valve 14, the first adsorber 1, the first desorption outlet automatic valve 13, the adsorber desorption outlet automatic switching valve 25, the desorption cooler 6, the desorption gas-water separator 7, the pre-adsorption inlet automatic switching valve 31, the pre-adsorber 3, the pre-adsorption outlet automatic switching valve 34, the hydrogen self-circulation device 4, the desorption heater 5 and the internally connected pipelines. The pressure of the third pressure transmitter 35 at the outlet of the pre-adsorber 3 reaches P1MPa.

[0060] As shown in Figure 6, in the A2D2 state, the second adsorber 2 is in the adsorption process, the first adsorber 1 is in the desorption stage of the desorption process, and the pre-adsorber 3 is in the pre-adsorption stage of the pre-adsorption process. After drying in the second adsorber 2, all the product hydrogen is output after being pressure-regulated to P1MPa by the self-operated pressure regulating valve 91, so as to achieve the adsorption working flow of the second adsorber 2 adjustable in the range of 0-100%; the first adsorber 1 is in the desorption stage of the desorption process, and the pre-adsorber 3 is in the pre-adsorption stage of the pre-adsorption process. The hydrogen self-circulation device 4 and the desorption heater 5 are started, and the gas with a pressure of P1MPa in the pre-adsorption gas outlet automatic switching valve 34, the hydrogen self-circulation device 4, and the desorption heater 5 are then passed through the adsorber desorption inlet self-circulation device 4. The air enters the first adsorber 1 through the automatic switching valve 26 and the first desorption air inlet automatic valve 14 to heat and desorb the internal adsorbent. Finally, it is cooled by the first desorption air outlet automatic valve 13, the adsorber desorption air outlet automatic switching valve 25, the desorption cooler 6, and the desorption air-water separator 7, and then self-circulates to the pre-adsorber 3 after air-water separation. The self-circulation time is W2, so that the adsorption process of the second adsorber 2 and the desorption process of the first adsorber 1 are independent of each other. When the adsorption working flow of the second adsorber 2 is in the range of 0-100%, the first adsorber 1 can still complete regeneration.

[0061] As shown in Figure 7, in the A2D3 state, the second adsorber 2 is in the adsorption process, the first adsorber 1 is in the adsorption stage of the desorption process, and the pre-adsorber 3 is in the desorption stage of the pre-adsorption process. After drying in the second adsorber 2, all the product hydrogen is output after being pressure-regulated to P1MPa by the self-operated pressure regulating valve 91, so as to achieve the adsorption working flow of the second adsorber 2 adjustable in the range of 0-100%; the first adsorber 1 is in the adsorption stage of the desorption process, the pre-adsorber 3 is in the desorption stage of the pre-adsorption process, the hydrogen self-circulation device 4 and the desorption heater 5 are in operation, and the gas with a pressure of P1MPa in the first adsorber 1 is heated by the first desorption air inlet automatic valve 14, the pre-adsorption air outlet automatic valve 16, the hydrogen self-circulation device 4, and the desorption heater 5, and then The air enters the pre-adsorber 3 through the desorption air inlet automatic switching valve 32 to heat and desorb the internal adsorbent, and finally passes through the desorption air outlet automatic switching valve 33 and the desorption cooler 6 for cooling, and the desorption air-water separator 7 for air-water separation, and then self-circulates to the first adsorber 1 through the pre-adsorption air inlet automatic valve 15 and the first desorption air outlet automatic valve 13. The self-circulation time is W3, so that the adsorption process of the second adsorber 2 and the desorption process of the pre-adsorber 3 are independent of each other. When the adsorption working flow of the second adsorber 2 is in the range of 0-100%, the pre-adsorber 3 can still complete regeneration.

[0062] In states A2D4, referring to Figures 6 and 7, the second adsorber 2 is in the adsorption process, the first adsorber 1 is in the desorption process, and the pre-adsorber 3 is in the pre-adsorption process. After drying, all product hydrogen in the second adsorber 2 is pressure-regulated to P1 MPa by the self-operated pressure regulating valve 91 before being output, enabling the adsorption flow rate of the second adsorber 2 to be adjustable within a range of 0-100%. The first adsorber 1 is in the desorption process, and the pre-adsorber 3 is in the pre-adsorption process. In stages D2 and D3, if the feedback pressure from the third pressure transmitter 35 falls below P2 MPa, the hydrogen self-circulating device 4 and the desorption heater 5 are shut down, the timing for the corresponding stage is stopped, and the first adsorption outlet automatic valve 12 or the external pressure automatic valve 96 is opened for pressure replenishment. The other valves remain in their original positions. After the feedback pressure from the third pressure transmitter 35 reaches P1 MPa, the first adsorption outlet automatic valve 12 or the external pressure automatic valve 96 is closed, and the hydrogen self-circulating device 4 and the desorption heater 5 are automatically activated to resume operation.

[0063] In state A2D5, referring to Figure 7 , the second adsorber 2 is in the adsorption process, the first adsorber 1 is in the desorption waiting phase, and the pre-adsorber 3 is in the pre-adsorption waiting phase. After drying in the second adsorber 2, all product hydrogen is pressure-regulated to P1 MPa by the self-operated pressure regulating valve 91 before output, enabling the adsorption flow rate of the second adsorber 2 to be adjustable within a range of 0-100%. The first adsorber 1 is in the desorption waiting phase, and the pre-adsorber 3 is in the pre-adsorption waiting phase. The hydrogen self-circulating device 4 and the desorption heater 5 are deactivated, and the valves remain in their original positions. The waiting period is W5.

[0064] In this solution, the adsorption process and the desorption process are independent of each other, and the flow rate of the raw hydrogen entering the adsorber does not affect the desorption process. The hydrogen self-circulation device 4 is used to circulate the P1MPa gas in the pre-adsorber 3 and the adsorber in the desorption process for desorption, which can effectively solve the impact of fluctuations or interruptions in the flow rate of raw hydrogen on the desorption effect. It is particularly suitable for intermittent and fluctuating renewable energy hydrogen production and meets the equipment operating load requirements of 0-100%.

[0065] In one existing technology, in order to solve the problem that the volatility of renewable energy hydrogen production is difficult to meet the regeneration flow demand, variable flow regeneration and desorption are adopted in different stages. However, when the front-end renewable energy hydrogen production is intermittent, there will be no raw hydrogen for regeneration and desorption, resulting in incomplete desorption, affecting the adsorption effect of the next cycle. The drying device still has a minimum regeneration flow requirement. Once the regeneration flow is continuously lower than the lower limit, it will also cause incomplete desorption. Even if hydrogen is introduced into the hydrogen storage area for regeneration, the hydrogen stored in the hydrogen storage area through the high-pressure hydrogen compressor will cause the hydrogen to be reduced from high pressure to low pressure, and then compressed to high pressure. The compression ratio of the compressor is relatively large, resulting in higher overall energy consumption of the system. Therefore, this technology cannot achieve an operating load of 0-100%, and it is difficult to meet the intermittent requirements of renewable energy hydrogen production.

[0066] Another existing technology addresses the problem of renewable energy hydrogen production fluctuating and failing to meet regeneration flow requirements by using multiple purification and drying units in parallel. However, this approach requires too many drying units, and the flow distribution within each unit must also be considered. This results in high equipment costs, and the drying units still require a minimum regeneration flow rate, making it impossible to operate at a 0-100% load, making it difficult to meet the intermittent requirements of renewable energy hydrogen production.

[0067] In this solution, an intelligent control method is adopted. The control system switches the working state by accumulating the amount of hydrogen adsorbed by the adsorber in a single time, which can effectively avoid heating and desorbing the adsorber before it is saturated with adsorption, maximize the adsorption capacity of the adsorber, reduce the frequency of heating and desorption, and reduce energy consumption.

[0068] This application features an innovative process flow design that allows for independent adsorption and desorption processes. The feed gas enters the adsorber and, after adsorption is complete, is completely output to a drying unit. The desorption process utilizes a hydrogen self-circulatory system to regenerate hydrogen in the pre-adsorber or within the adsorber. This effectively addresses the issue of incomplete desorption caused by fluctuations in the feed hydrogen flow rate, leading to interruptions and interruptions. This is particularly well-suited for intermittent and fluctuating renewable energy hydrogen production. The hydrogen drying unit operates to meet the 0-100% renewable energy hydrogen production load requirement.

[0069] The hydrogen self-circulation device has no impact on the purity of the hydrogen after circulation. It consists of at least one self-circulation unit. When the operating flow of a single self-circulation unit is limited and cannot meet the desorption flow demand, multiple units can be operated in parallel. The outlet check valve of each unit effectively prevents the backflow of hot gas from the desorption heater, which may affect the service life of the self-circulation equipment.

[0070] Based on the above characteristics, this application optimizes the design of the hydrogen drying device to specifically match intermittent and fluctuating renewable energy hydrogen production to meet the equipment operating load requirement of 0-100%.

[0071] The hydrogen drying system for renewable energy hydrogen production is designed to dry all hydrogen produced under intermittent or fluctuating renewable energy conditions. This system can be started and stopped according to the characteristics of the renewable energy source, enabling the adsorber to produce pure hydrogen within the operating flow range of 0-100%. The regenerated adsorber and regenerated pre-adsorber can independently regenerate within the operating flow range of 0-100%, ensuring thorough regeneration and maintaining adsorption capacity at any time after the adsorber switches from desorption to adsorption.

[0072] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A hydrogen drying system for producing hydrogen from renewable energy, characterized in that: The invention comprises two adsorbers, a pre-adsorber (3), a hydrogen self-circulating device (4), a desorption heater (5), a desorption cooler (6) and a desorption gas-water separator (7); wherein the two adsorbers are arranged in parallel, and the two adsorbers alternately perform an adsorption process and a desorption process, and the adsorption flow of the adsorber varies with the fluctuation of the input renewable energy, and the working state of the adsorber is switched by accumulating the hydrogen flow processed by the adsorber in a single adsorption process; the pre-adsorber (3) is connected in series with one of the adsorbers to assist the desorption process; the desorption process circulates the pre-adsorber (3) or the hydrogen self-circulating device (4) through the hydrogen self-circulating device (4). The hydrogen in the adsorber is independent of the adsorption process, and dry hydrogen is directly output after the adsorption process is completed; the desorption heater (5) is connected to the outlet of the hydrogen self-circulation device (4) to heat the hydrogen output by the hydrogen self-circulation device (4); the inlet of the desorption cooler (6) is connected to the adsorber or the pre-adsorber (3), and the outlet is connected to the desorption gas-water separator (7) for condensing water vapor entrained in the hydrogen in the desorption process, and separating hydrogen and liquid water through the desorption gas-water separator (7), and the hydrogen outlet of the desorption gas-water separator (7) is connected to the adsorber or the pre-adsorber (3).

2. The hydrogen drying system for producing hydrogen from renewable energy according to claim 1, characterized in that: The two adsorbers are respectively a first adsorber (1) and a second adsorber (2); the inlet of the first adsorber (1) is connected to the raw hydrogen inlet (01) via a first adsorption air inlet automatic valve (11); the inlet of the first adsorber (1) is connected to the pre-adsorber (3) via a first desorption air outlet automatic valve (13), a pre-adsorption air inlet automatic valve (15) which are arranged in sequence; the outlet of the first adsorber (1) is connected to a first adsorption air outlet automatic valve (12) for discharging hydrogen; the outlet of the first adsorber (1) is connected to the hydrogen self-circulation device (4) and the pre-adsorber (3) via a first desorption air inlet automatic valve (14) and a first pre-adsorption air outlet automatic valve (16) which are arranged in sequence; the inlet of the second adsorber (2) is connected to the raw hydrogen inlet (01) via a second adsorption air inlet automatic valve (21); The inlet is connected to the desorption cooler (6) through a second desorption gas outlet automatic valve (23), an adsorber desorption gas outlet automatic switching valve (25) which are arranged in sequence; the outlet of the second adsorber (2) is connected to a second adsorption gas outlet automatic valve (22) for discharging hydrogen; the outlet of the second adsorber (2) is connected to the desorption heater (5) through a second desorption gas inlet automatic valve (24) and an adsorber desorption gas inlet automatic switching valve (26) which are arranged in sequence; wherein the two adsorbers share one pre-adsorption gas inlet automatic valve (15), one pre-adsorption gas outlet automatic valve (16), one adsorber desorption gas inlet automatic switching valve (26) and one adsorber desorption gas outlet automatic switching valve (25); the outlet of the first adsorber (1) is connected to a first pressure transmitter (17), and the outlet of the second adsorber (2) is connected to a second pressure transmitter (27).

3. The hydrogen drying system for producing hydrogen from renewable energy according to claim 2, characterized in that: The inlet of the pre-adsorber (3) is connected to the pre-adsorption air inlet automatic switching valve (31) and the pre-adsorption air inlet automatic valve (15), the inlet of the pre-adsorber (3) is connected to the desorption cooler (6) through the desorption air outlet automatic switching valve (33), the outlet of the pre-adsorber (3) is connected to the external pressure inlet (07) through the desorption air inlet automatic switching valve (32), the outlet of the pre-adsorber (3) is connected to the hydrogen self-circulation device (4) and the pre-adsorption air outlet automatic switching valve (16) through the pre-adsorption air outlet automatic switching valve (34), and the outlet of the pre-adsorber (3) is connected to a third pressure transmitter (35).

4. The hydrogen drying system for producing hydrogen from renewable energy according to claim 1, characterized in that: The inlet of the hydrogen self-circulation device (4) is connected to the pre-adsorber (3) or the adsorber, and the hydrogen self-circulation device (4) includes multiple sets of self-circulation units. When the working flow of a single set of the self-circulation units does not meet the desorption flow requirement, the multiple sets of the self-circulation units are operated in parallel; each set of the self-circulation units includes a self-circulation inlet shut-off valve, a self-circulation device, a self-circulation outlet check valve and a self-circulation outlet shut-off valve connected in sequence.

5. The hydrogen drying system for producing hydrogen from renewable energy according to claim 1, characterized in that: The hydrogen drying system for producing hydrogen from renewable energy further comprises a raw hydrogen inlet (01), a product hydrogen outlet (02), a hydrogen venting port (03), a cooling water outlet (04), a cooling water inlet (05), a sewage outlet (06), an external pressure inlet (07) and a water collector (8); wherein the raw hydrogen inlet (01) is connected to the inlet of the adsorber, the product hydrogen outlet (02) is connected to the outlet of the adsorber via a product hydrogen automatic valve (94), the hydrogen venting port (03) is connected to the outlet of the adsorber via a hydrogen venting automatic valve (95), and the adsorber is connected to the product hydrogen outlet (06). A self-operated pressure regulating valve (91), a hydrogen flow meter (92) and a hydrogen dew point meter (93) are provided on the pipeline of the outlet (02); the cooling water inlet (05) and the cooling water outlet (04) are both connected to the desorption cooler (6); the external pressure inlet (07) is connected to the adsorber and the pre-adsorber (3) via an external pressure automatic valve (96); the liquid outlet of the desorption gas-water separator (7) is connected to the inlet of the water collector (8) via a liquid outlet automatic valve (71); and the outlet of the water collector (8) is connected to the sewage outlet (06) via an sewage automatic valve (81).

6. The hydrogen drying system for producing hydrogen from renewable energy according to claim 1, characterized in that: The desorption process includes a pressurization stage, a desorption stage, a pre-adsorption stage, a waiting stage and a pressure replenishing stage. The pre-adsorption process of the pre-adsorber (3) includes a pressurization stage, a pre-adsorption stage, a desorption stage, a pressure replenishing stage and a waiting stage. The two adsorbers are respectively a first adsorber (1) and a second adsorber (2). If the first adsorber (1) is in an adsorption process A1, then the second adsorber (2) is in a desorption process D, which is A1D. If the second adsorber (2) is in an adsorption process A2, then the first adsorber (1) is in a desorption process D, which is A2D. The pressurization stage of the adsorber corresponds to the pressurization stage of the pre-adsorber (3), which is the D1 stage. The desorption stage corresponds to the adsorption stage of the pre-adsorber (3), which is the D2 stage; the pre-adsorption stage of the adsorber corresponds to the desorption stage of the pre-adsorber (3), which is the D3 stage; the pressure replenishing stage of the adsorber corresponds to the pressure replenishing stage of the pre-adsorber (3), which is the D4 stage; the waiting stage of the adsorber corresponds to the waiting stage of the pre-adsorber (3), which is the D5 stage; the working state combination of the two adsorbers and the pre-adsorber (3) is divided into A1D1, A1D2, A1D3, A1D4, A1D5, A2D1, A2D2, A2D3, A2D4, A2D5 states, and the switching of each state is realized by changing the switch state of multiple automatic valves.

7. The hydrogen drying system for producing hydrogen from renewable energy according to claim 6, characterized in that: The rated hydrogen adsorption capacity of the adsorber per hour is X1 Nm 3 The rated adsorption time is N hours, and the single hydrogen adsorption capacity of the adsorber is Y1=N*X1 Nm 3 The initial cumulative flow rate of the hydrogen flowmeter (92) at the outlet of the adsorber at the start of a single adsorption is Y0 Nm 3 The actual hydrogen adsorption flow rate of the adsorber is 0-100% of the rated value. When the accumulated flow rate of the hydrogen flow meter (92) at the outlet of the adsorber reaches Y2 Nm 3 When Y2=Y0+Y1, the adsorption process is automatically switched to the desorption process, that is, switching from A1D to A2D or from A2D to A1D.

8. The hydrogen drying system for producing hydrogen from renewable energy according to claim 7, characterized in that: The stages D1 to D3 are performed in sequence, and the total duration of the desorption process is W. In the D1 stage, the adsorber and the pre-adsorber (3) in the desorption process are pressurized, and the feedback pressure of the third pressure transmitter (35) at the outlet of the pre-adsorber (3) reaches P1MPa. The duration of the D1 stage is W1 and is a non-fixed value; the hydrogen self-circulation device (4) and the desorption heater (5) are started, and the amount of self-circulating hydrogen is X2 Nm 3 / h, the adsorbent in the pre-adsorber (3) is pre-adsorbed, and the adsorbent in the adsorber is desorbed, and the duration of the D2 stage is W2 and is a constant value; after the end of the D2 stage, the D3 stage is entered, the hydrogen self-circulation device (4) and the desorption heater (5) continue to operate, and the amount of self-circulating hydrogen is still X2 Nm 3 / h, the adsorbent in the adsorber is pre-adsorbed, and the adsorbent in the pre-adsorber (3) is desorbed, and the D3 stage lasts for W3 and is a fixed value; after the end of the D3 stage, the D5 stage is entered, the hydrogen self-circulation device (4) and the desorption heater (5) are stopped, and the adsorber and the pre-adsorber (3) in the desorption process are both waiting, and the D5 stage lasts for W5 and is a non-fixed value; wherein, in the D2 and D3 stages, if the feedback pressure of the third pressure transmitter (35) at the outlet of the pre-adsorber (3) is lower than P2MPa ... hydrogen self-circulation device (4) and the desorption heater (5) are stopped, and the hydrogen self-circulation device (4) and the desorption heater (5) are stopped, and the hydrogen self-circulation device (4) and the pre-adsorber (3) in the desorption process are both stopped, and the D5 stage lasts for W5 and is a non-fixed value; wherein, in the D2 and D3 stages, if the feedback pressure of the third pressure transmitter (35) at the outlet of the pre-adsorber (3) is lower than P2MPa, the hydrogen self-circulation device (4) and the desorption heater (5) are stopped, and the hydrogen self-circulation device (4) and the desorption heater (5) are stopped, and the hydrogen self-circulation device (4) and the desorption heater (5) are The timing of the corresponding stage of the hydrogen self-circulation device (4) and the desorption heater (5) stops and the D4 stage is entered. The D4 stage has a duration of W4 and is a non-fixed value. After the pressure is replenished until the feedback pressure of the third pressure transmitter (35) reaches P1MPa, the hydrogen self-circulation device (4) and the desorption heater (5) are automatically started to continue working in the corresponding stage; wherein, the actual single adsorption time of the adsorber in the adsorption process is Z, Z=W, Z-W5=W1+W2+W3+W4≤N, 0<P2<P1, 0<X2≤X1.

9. The hydrogen drying system for producing hydrogen from renewable energy according to claim 8, characterized in that: The adsorbent amount in the first adsorber (1) and the second adsorber (2) is filled according to the single adsorption hydrogen amount Y1, and the adsorbent amount in the pre-adsorber (3) is filled according to the single pre-adsorption hydrogen amount Y3=W2*X2 Nm 3 Filling: the effective volume of the first adsorber (1) and the second adsorber (2) is greater than the effective volume of the pre-adsorber (3).

10. The hydrogen drying system for producing hydrogen from renewable energy according to claim 6, characterized in that: The liquid outlet of the desorption gas-water separator (7) is connected to the inlet of the water collector (8) via the liquid outlet automatic valve (71), and the outlet of the water collector (8) is connected to the sewage outlet (06) via the sewage automatic valve (81). The effective volume of the water collector (8) is V, and the adsorber has a single adsorption capacity of Y1 Nm 3 The total amount of water in the hydrogen is V1, where V1=1 / 2V; when the adsorber and the pre-adsorber (3) in the desorption process just enter the D5 stage, the automatic sewage discharge valve (81) is opened, and the sewage discharge time each time is T1; the liquid outlet automatic valve (71) is in a normally open state, and the liquid outlet automatic valve (71) is closed T2 time before the opening of the automatic sewage discharge valve (81), and the liquid outlet automatic valve (71) is opened T2 time after the closing time of the automatic sewage discharge valve (81).

11. The hydrogen drying system for producing hydrogen from renewable energy according to claim 6, characterized in that: In the A1D1 state, the first adsorber (1) is in the adsorption process, hydrogen enters the first adsorber (1) from the raw hydrogen inlet (01) through the first adsorption air inlet automatic valve (11) for adsorption drying, and the dried hydrogen flows out from the first adsorption air outlet automatic valve (12), and most of the product hydrogen is output after the pressure is adjusted to P1MPa by the self-operated pressure regulating valve (91), so as to achieve the adsorption working flow of the first adsorber (1) adjustable in the range of 0-100%; the second adsorber (2) is the pressurization stage in the desorption process, and the pre-adsorber (3) is the pre-adsorption process The pressurization stage; when hydrogen is input to the raw hydrogen inlet (01), a small portion of the product hydrogen output by the first adsorber (1) is passed through the second adsorption outlet automatic valve (22), the second adsorber (2), the second desorption outlet automatic valve (23), the adsorber desorption outlet automatic switching valve (25), the desorption cooler (6), the desorption gas-water separator (7), the pre-adsorption inlet automatic switching valve (31), the pre-adsorber (3), the pre-adsorption outlet automatic switching valve (34), the hydrogen self-circulation device (4), the desorption heater (5), the adsorber desorption inlet automatic switching valve (25), the pre-ad ... The switching valve (26), the second desorption air inlet automatic valve (24) and the connected pipeline are pressurized until the pressure of the third pressure transmitter (35) at the outlet of the pre-adsorber (3) reaches P1MPa: when there is no hydrogen input to the raw hydrogen inlet (01), it is possible to choose to wait for the hydrogen input to the first adsorber (1) to be internally pressurized and the valve state remains in place, or to choose external pressurization, the second adsorption air outlet automatic valve (22) of the second adsorber (2) is closed, and the external high-purity hydrogen or high-purity nitrogen input from the external pressure inlet (07) through the external pressure automatic valve (96) is passed through the adsorber desorption air inlet automatic switching valve (2 6), the second desorption air inlet automatic valve (24), the second adsorber (2), the second desorption air outlet automatic valve (23), the adsorber desorption air outlet automatic switching valve (25), the desorption cooler (6), the desorption gas-water separator (7), the pre-adsorption air inlet automatic switching valve (31), the pre-adsorber (3), the pre-adsorption air outlet automatic switching valve (34), the hydrogen self-circulation device (4), the desorption heater (5) and the internally connected pipelines are pressurized, and the pressure of the third pressure transmitter (35) at the outlet of the pre-adsorber (3) reaches P1MPa.

12. The hydrogen drying system for producing hydrogen from renewable energy according to claim 11, characterized in that: In the A1D2 state, after drying, all the hydrogen products of the first adsorber (1) are output after being pressure-regulated to P1MPa by the self-operated pressure regulating valve (91), so as to realize that the adsorption working flow rate of the first adsorber (1) is adjustable in the range of 0-100%; the second adsorber (2) is the desorption stage of the desorption process, and the pre-adsorber (3) is the pre-adsorption stage of the pre-adsorption process. The hydrogen self-circulation device (4) and the desorption heater (5) are started, and the gas with a pressure of P1MPa in the pre-adsorption device (3) passes through the pre-adsorption outlet automatic switching valve (34), the hydrogen self-circulation device (4), and the desorption heater (5), and then passes through the adsorption device (3). The first adsorber (1) and the second adsorber (2) are connected to the desorption automatic air inlet switching valve (26) and the second desorption automatic air inlet valve (24) to heat and desorb the internal adsorbent, and finally, the second adsorber (2) is connected to the desorption automatic air outlet valve (23), the adsorber (2) and the desorption cooler (6) for cooling, and the desorption gas-water separator (7) is used for gas-water separation before self-circulation to the pre-adsorber (3). The self-circulation time is W2, so as to realize that the adsorption process of the first adsorber (1) and the desorption process of the second adsorber (2) are independent of each other. When the adsorption working flow rate of the first adsorber (1) is in the range of 0-100%, the second adsorber (2) can still complete regeneration.

13. The hydrogen drying system for producing hydrogen from renewable energy according to claim 11, characterized in that: In the A1D3 state, all the hydrogen products after drying in the first adsorber (1) are output after the pressure is adjusted to P1MPa by the self-operated pressure regulating valve (91), so as to realize that the adsorption working flow rate of the first adsorber (1) is adjustable in the range of 0-100%; the second adsorber (2) is the adsorption stage of the desorption process, the pre-adsorber (3) is the desorption stage of the pre-adsorption process, the hydrogen self-circulation device (4) and the desorption heater (5) are in operation, and the gas with a pressure of P1MPa in the second adsorber (2) is discharged through the second desorption air inlet automatic valve (24), the pre-adsorption air outlet automatic valve (16), the hydrogen self-circulation device (4), and the desorption heater (5). (5) After heating, the desorption air enters the pre-adsorber (3) through the desorption air inlet automatic switching valve (32) to heat and desorb the internal adsorbent, and finally passes through the desorption air outlet automatic switching valve (33), the desorption cooler (6) for cooling, and the desorption air-water separator (7) for air-water separation, and then self-circulates to the second adsorber (2) through the pre-adsorption air inlet automatic valve (15) and the second desorption air outlet automatic valve (23). The self-circulation time is W3, so that the adsorption process of the first adsorber (1) and the desorption process of the pre-adsorber (3) are independent of each other. When the adsorption working flow rate of the first adsorber (1) is in the range of 0-100%, the pre-adsorber (3) can still complete regeneration.

14. The hydrogen drying system for producing hydrogen from renewable energy according to claim 11, characterized in that: In the A1D4 state, all the hydrogen products after drying in the first adsorber (1) are output after the pressure is adjusted to P1MPa by the self-operated pressure regulating valve (91), so that the adsorption working flow rate of the first adsorber (1) can be adjusted in the range of 0-100%; the second adsorber (2) is the pressure replenishment stage of the desorption process, and the pre-adsorber (3) is the pressure replenishment stage of the pre-adsorption process; in the D2 and D3 stages, if the feedback pressure of the third pressure transmitter (35) is lower than P2MPa, the pressure transmitter (35) is closed. The timing of the corresponding stage of the hydrogen self-circulation device (4) and the desorption heater (5) is stopped, and the second adsorption gas outlet automatic valve (22) or the external pressure filling automatic valve (96) is opened to replenish the pressure, and the other valve states remain in place. After the pressure is replenished until the feedback pressure of the third pressure transmitter (35) reaches P1MPa, the second adsorption gas outlet automatic valve (22) or the external pressure filling automatic valve (96) is closed, and the hydrogen self-circulation device (4) and the desorption heater (5) are automatically started to continue working.

15. The hydrogen drying system for producing hydrogen from renewable energy according to claim 11, characterized in that: In the A1D5 state, all the hydrogen products produced by the first adsorber (1) after drying are output after the pressure is adjusted to P1MPa by the self-operated pressure regulating valve (91), so as to achieve an adsorption working flow rate of the first adsorber (1) adjustable in the range of 0-100%; the second adsorber (2) is in the waiting stage of the desorption process, the pre-adsorber (3) is in the waiting stage of the pre-adsorption process, the hydrogen self-circulation device (4) and the desorption heater (5) are stopped, the valve state remains in place, and the waiting time is W5.

16. The hydrogen drying system for producing hydrogen from renewable energy according to claim 6, characterized in that: In the A2D1 state, the second adsorber (2) is in the adsorption process, hydrogen enters the second adsorber (2) from the raw hydrogen inlet (01) through the second adsorption air inlet automatic valve (21) for adsorption drying, the dried hydrogen flows out from the second adsorption air outlet automatic valve (22), most of the product hydrogen is output after the pressure is adjusted to P1 MPa by the self-operated pressure regulating valve (91), so as to achieve the adsorption working flow of the second adsorber (2) adjustable in the range of 0-100%; the first adsorber (1) is the pressurization stage of the desorption process, and the pre-adsorber (3) is the pressurization stage of the pre-adsorption process; when hydrogen is input into the raw hydrogen inlet (01), a small part of the product hydrogen outputted from the second adsorber (2) is outputted through the first adsorption air outlet automatic valve (12), the first adsorber (1), the first desorption air outlet automatic valve (13), the adsorber desorption The outlet automatic switching valve (25), the desorption cooler (6), the desorption gas-water separator (7), the pre-adsorption inlet automatic switching valve (31), the pre-adsorber (3), the pre-adsorption outlet automatic switching valve (34), the hydrogen self-circulating device (4), the desorption heater (5), the adsorber desorption inlet automatic switching valve (26), the first desorption inlet automatic valve (14) and the connected pipelines are pressurized until the pressure of the third pressure transmitter (35) at the outlet of the pre-adsorber (3) reaches P1M Pa; when there is no hydrogen input to the raw hydrogen inlet (01), the internal pressure can be charged while waiting for the hydrogen input to the second adsorber (2), and the valve state can be kept in place, or external pressure can be charged, the first adsorption outlet automatic valve (12) of the first adsorber (1) is closed, and the external high-purity hydrogen or high-purity nitrogen input from the external pressure charging inlet (07) through the external pressure charging automatic valve (96) passes through the adsorber desorption inlet automatic switching valve (26), the first desorption inlet automatic valve (14), the first adsorber (1), The first desorption gas outlet automatic valve (13), the adsorber desorption gas outlet automatic switching valve (25), the desorption cooler (6), the desorption gas-water separator (7), the pre-adsorption gas inlet automatic switching valve (31), the pre-adsorber (3), the pre-adsorption gas outlet automatic switching valve (34), the hydrogen self-circulation device (4), the desorption heater (5) and the internally connected pipelines are pressurized, and the pressure of the third pressure transmitter (35) at the outlet of the pre-adsorber (3) reaches P1MPa.

17. The hydrogen drying system for producing hydrogen from renewable energy according to claim 16, characterized in that: In the A2D2 state, all the hydrogen products of the second adsorber (2) after drying are adjusted to P1MPa by the self-operated pressure regulating valve (91) and then output, so as to achieve that the adsorption working flow rate of the second adsorber (2) is adjustable in the range of 0-100%; the first adsorber (1) is the desorption stage of the desorption process, the pre-adsorber (3) is the pre-adsorption stage of the pre-adsorption process, the hydrogen self-circulation device (4) and the desorption heater (5) are started, and the gas with a pressure of P1MPa in the pre-adsorption device (3) passes through the pre-adsorption outlet automatic switching valve (34), the hydrogen self-circulation device (4), the desorption heater (5), and then passes through the adsorption The gas enters the first adsorber (1) through the desorption automatic air inlet switching valve (26) and the first desorption automatic air inlet valve (14) to heat and desorb the internal adsorbent, and finally passes through the first desorption automatic air outlet valve (13), the adsorber desorption automatic air outlet switching valve (25), the desorption cooler (6) for cooling, and the desorption gas-water separator (7) for gas-water separation before self-circulating to the pre-adsorber (3). The self-circulation time is W2, so as to realize that the adsorption process of the second adsorber (2) and the desorption process of the first adsorber (1) are independent of each other. When the adsorption working flow rate of the second adsorber (2) is in the range of 0-100%, the first adsorber (1) can still complete regeneration.

18. The hydrogen drying system for producing hydrogen from renewable energy according to claim 16, characterized in that: In the A2D3 state, all the hydrogen products of the second adsorber (2) after drying are output after being pressure-regulated to P1MPa by the self-operated pressure regulating valve (91), so as to realize that the adsorption working flow rate of the second adsorber (2) is adjustable in the range of 0-100%; the first adsorber (1) is the adsorption stage of the desorption process, the pre-adsorber (3) is the desorption stage of the pre-adsorption process, the hydrogen self-circulation device (4) and the desorption heater (5) are in operation, and the gas with a pressure of P1MPa in the first adsorber (1) is discharged through the first desorption air inlet automatic valve (14), the pre-adsorption air outlet automatic valve (16), the hydrogen self-circulation device (4), the desorption heater (5) and the like. (5) After heating, the desorption gas enters the pre-adsorber (3) through the desorption air inlet automatic switching valve (32) to heat and desorb the internal adsorbent, and finally passes through the desorption air outlet automatic switching valve (33), the desorption cooler (6) for cooling, and the desorption air-water separator (7) for air-water separation, and then self-circulates to the first adsorber (1) through the pre-adsorption air inlet automatic valve (15) and the first desorption air outlet automatic valve (13). The self-circulation time is W3, so as to realize that the adsorption process of the second adsorber (2) and the desorption process of the pre-adsorber (3) are independent of each other. In the range of 0-100% of the adsorption working flow of the second adsorber (2), the pre-adsorber (3) can still complete regeneration.

19. The hydrogen drying system for producing hydrogen from renewable energy according to claim 16, characterized in that: In the A2D4 state, all the hydrogen products after drying in the second adsorber (2) are output after the pressure is adjusted to P1MPa by the self-operated pressure regulating valve (91), so that the adsorption working flow rate of the second adsorber (2) can be adjusted in the range of 0-100%; the first adsorber (1) is the pressure replenishment stage of the desorption process, and the pre-adsorber (3) is the pressure replenishment stage of the pre-adsorption process; in the D2 and D3 stages, if the feedback pressure of the third pressure transmitter (35) is lower than P2MPa, the pressure transmitter (35) is closed. The timing of the corresponding stage of the hydrogen self-circulation device (4) and the desorption heater (5) is stopped, the first adsorption gas outlet automatic valve (12) or the external pressure filling automatic valve (96) is opened to replenish the pressure, and the other valves are kept in place. After the pressure is replenished until the feedback pressure of the third pressure transmitter (35) reaches P1MPa, the first adsorption gas outlet automatic valve (12) or the external pressure filling automatic valve (96) is closed, and the hydrogen self-circulation device (4) and the desorption heater (5) are automatically started to continue working.

20. The hydrogen drying system for producing hydrogen from renewable energy according to claim 16, characterized in that: In the A2D5 state, all the product hydrogen after drying in the second adsorber (2) is output after the pressure is adjusted to P1MPa by the self-operated pressure regulating valve (91), so as to achieve the adsorption working flow of the second adsorber (2) adjustable in the range of 0-100%; the first adsorber (1) is in the waiting stage of the desorption process, the pre-adsorber (3) is in the waiting stage of the pre-adsorption process, the hydrogen self-circulation device (4) and the desorption heater (5) are stopped, the valve state remains in place, and the waiting time is W5.

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