Off-grid hydrogen production gas drying system

Abstract

The utility model discloses an off-grid hydrogen production gas drying system which comprises a drying mechanism, a regeneration mechanism and an overpressure protection mechanism, a gas inlet pipeline is communicated with a gas outlet pipeline through a working pipeline, a safety pressure relief pipeline is communicated with the drying mechanism through a safety branch, and the drying mechanism is communicated with the regeneration mechanism. The regeneration mechanism is communicated with the drying mechanism through a regeneration pipeline and an auxiliary pipeline, the drying mechanism comprises a first dryer, a second dryer and a third dryer, the first dryer, the second dryer and the third dryer respectively correspond to one branch group, and the regeneration mechanism comprises a regeneration cooler, a regeneration heater and a regeneration gas-liquid separator. The regeneration cooler is connected with the regeneration gas-liquid separator in series, and the overpressure protection mechanism comprises a safety valve and a pressure transmitter. The off-grid hydrogen production gas drying system provided by the utility model has the advantages of adaptability to intermittent operation requirements, strong anti-interference capability and large working load flow range.

Description

Technical Field

[0001] The utility model relates to the technical field of off-grid hydrogen production, in particular to an off-grid hydrogen production gas drying system. Background Art

[0002] The volatility and intermittency on the power generation side bring many technical problems to off-grid hydrogen production. One of the key technical problems faced is that the intermittently produced hydrogen is difficult to adapt to the long-term stable operation of the hydrogen drying device. At present, relevant technologies need to continuously provide the raw gas flow rate to ensure the smooth completion of the regeneration process. The interruption of the raw gas directly affects the regeneration heating process. Especially after the regeneration heating has stopped for a long time, there is a large temperature difference between the continued regeneration and the previous regeneration, resulting in the regeneration end temperature not reaching the set value, and then the adsorbent regeneration is incomplete, thus affecting the dew point of the product hydrogen. In addition, due to the fluctuating working conditions of the upstream renewable energy, the hydrogen production amount fluctuates within a large range, and a single output gas pressure regulating valve cannot quickly and stably achieve the hydrogen outlet pressure regulation under wide load conditions. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems in the related technologies to a certain extent.

[0004] Therefore, an embodiment of the utility model provides an off-grid hydrogen production gas drying system, which has the advantages of meeting the requirements of intermittent operation, strong anti-interference ability, and a large working load flow range.

[0005] According to the off-grid hydrogen production gas drying system of the embodiment of the utility model, it includes a drying mechanism, a regeneration mechanism and an overpressure protection mechanism. The inlet pipeline is connected to the outlet pipeline through a working pipeline. The safety relief pipeline is connected to the drying mechanism through a safety branch pipeline. The regeneration mechanism is connected to the drying mechanism through a regeneration pipeline and an auxiliary pipeline. The working pipeline includes a first branch and a second branch. The regeneration pipeline includes a first main road, a second main road, a third branch and a fourth branch. The auxiliary pipeline includes a third main road, a fourth main road, a fifth branch and a sixth branch. The first branch, the second branch, the third branch, the fourth branch, the fifth branch, the sixth branch and the safety branch form a group of branch pipelines;

[0006] The drying mechanism includes a first dryer, a second dryer and a third dryer. The first dryer, the second dryer and the third dryer respectively correspond to a group of the branch pipelines;

[0007] The regeneration mechanism includes a regeneration cooler, a regeneration heater, a regeneration gas flow regulating valve, and a regeneration gas-liquid separator. The regeneration cooler is connected in series with the regeneration gas-liquid separator. The regeneration gas flow regulating valve is located on the outlet gas pipeline. The feed end of the regeneration heater is connected to the outlet gas pipeline between the regeneration gas flow regulating valve and the second branch. The discharge end of the regeneration heater is connected to the first main path. The second main path is connected to the inlet of the regeneration cooler. The outlet of the regeneration gas-liquid separator is connected to the third main path. The fourth main path is connected to the drying mechanism and the outlet gas pipeline;

[0008] The overpressure protection mechanism includes a safety valve and a pressure transmitter. The safety valve is arranged on the safety branch. The pressure transmitter is connected to the third branch. The safety valve and the pressure transmitter are arranged in one-to-one correspondence with the branch group.

[0009] The off-grid hydrogen production gas drying system according to the embodiment of the present invention has the advantages of meeting the requirements of intermittent operation, strong anti-interference ability, and a large working load flow range. This application has the following advantages: Through the optimized design of the dryer, the temperature in the dryer section during continuous operation and intermittent operation is accurately controlled, effectively solving the influence of regeneration interruption on the regeneration effect and broadening the working load flow range. Through the optimized design of the output gas pressure regulating valve, accurate pressure regulation of the output gas flow in a wide range is achieved. The overpressure protection devices for the dryer and the heater are designed to improve the safety of system operation. Particularly, it matches the off-grid hydrogen production conditions of wind and light to meet the requirements of intermittent operation.

[0010] In some embodiments, the inlet of the first dryer is connected to the inlet gas pipeline through the first branch, the outlet of the first dryer is connected to the outlet gas pipeline through the second branch, the third branch connects the first main path and the first branch, the fourth branch connects the second branch and the second main path, the regeneration gas-liquid separator is connected to the auxiliary pipeline, the third main path is connected to the first branch through the fifth branch, and the sixth branch is connected to the fourth main path;

[0011] The inlet of the second dryer is connected to the inlet gas pipeline through the first branch, the outlet of the first dryer is connected to the outlet gas pipeline through the second branch, the third branch connects the first main path and the first branch, the fourth branch connects the second branch and the second main path, the third main path is connected to the first branch through the fifth branch, and the sixth branch is connected to the fourth main path;

[0012] The air inlet of the third dryer is connected to the intake pipeline through the first branch. The air outlet of the first dryer is connected to the outlet pipeline through the second branch. The third branch connects the first main path to the first branch. The fourth branch connects the second branch to the second main path. The third main path is connected to the first branch through the fifth branch. The sixth branch is connected to the fourth main path.

[0013] In some embodiments, the first dryer, the second dryer, and the third dryer each have a working state intake valve, a working state outlet valve, a regeneration state intake valve, an auxiliary working state intake valve, a regeneration state outlet valve, and an auxiliary working state outlet valve. The working state intake valve is located on the first branch. The working state outlet valve is located on the second branch. The regeneration state intake valve is located on the third branch. The regeneration state outlet valve is located on the fourth branch. The auxiliary working state intake valve is located on the fifth branch. The auxiliary working state outlet valve is located on the sixth branch.

[0014] In some embodiments, the first dryer, the second dryer, and the third dryer have the same structure. The first dryer includes a heat insulation layer, a cylinder body, heating elements, and a temperature transmitter. The heat insulation layer is arranged on the outer surface of the cylinder body to reduce heat loss of the cylinder body. At least three heating elements are arranged between the cylinder body and the heat insulation layer to heat the cylinder body. At least three temperature transmitters are respectively arranged on the inner and outer sides of the cylinder body to monitor the temperature of the cylinder body.

[0015] In some embodiments, a regeneration heating outlet pressure transmitter is arranged on one side of the first main path near the discharge end of the regeneration heater. The first main path is connected to the safety relief pipeline through a branch pipeline. The regeneration vent valve and the regeneration outlet safety valve are located on different branch pipelines and are in parallel. The regeneration cooler is provided with a regeneration cooling water inlet and a regeneration cooling water outlet. The regeneration gas-liquid separator is provided with a blowdown port.

[0016] In some embodiments, the off-grid hydrogen production gas drying system further includes a pressure regulating mechanism. The pressure regulating mechanism includes an output gas flowmeter and an output gas pressure transmitter arranged in sequence on the outlet pipeline. The regeneration gas flowmeter is located on the pipeline between the second main path and the outlet pipeline. The outlet pipeline is connected to the output gas outlet. A plurality of output gas pressure regulating valves are located on the side of the outlet pipeline adjacent to the output gas outlet and are in parallel with each other.

[0017] The force adjustment mechanism includes three output gas pressure regulating valves. The flow rate adjustment range of the first output gas pressure regulating valve is N1 to X0, the flow rate adjustment range of the second output gas pressure regulating valve is N2 to N3, and the flow rate adjustment range of the third output gas pressure regulating valve is N4 to N5, where N5 < N4 < N3 < N2 < N1 < X0. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of an off-grid hydrogen production gas drying system according to an embodiment of the present invention.

[0019] Figure 2 is a schematic structural diagram of the first dryer of an off-grid hydrogen production gas drying system according to an embodiment of the present invention.

[0020] Reference numerals: 1, first dryer; 11, working state inlet valve; 12, working state outlet valve; 13, regeneration state inlet valve; 14, auxiliary working state inlet valve; 15, regeneration state outlet valve; 16, auxiliary working state outlet valve; 17, safety valve; 18, pressure transmitter; 111, thermal insulation layer; 121, temperature transmitter; 131, heating element; 2, second dryer; 3, third dryer; 4, regeneration heater; 41, regeneration heating outlet pressure transmitter; 42, regeneration outlet safety valve; 43, regeneration outlet vent valve; 5, regeneration cooler; 51, regeneration cooling water inlet; 52, regeneration cooling water outlet; 6, regeneration gas-liquid separator; 61, drain port; 71, regeneration gas flow regulating valve; 72, regeneration gas flow meter; 73, output gas flow meter; 74, output gas pressure transmitter; 75, output gas pressure regulating valve; 81, raw material gas inlet; 82, output gas outlet; 83, safety relief port. Detailed Embodiments

[0021] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0022] According to the off-grid hydrogen production gas drying system of the embodiments of the present utility model, it includes a drying mechanism, a regeneration mechanism, and an overpressure protection mechanism. The intake pipeline is connected to the outlet pipeline through a working pipeline. The safety relief pipeline is connected to the drying mechanism through a safety branch. The regeneration mechanism is connected to the drying mechanism through a regeneration pipeline and an auxiliary pipeline. The working pipeline includes a first branch and a second branch. The regeneration pipeline includes a first main road, a second main road, a third branch, and a fourth branch. The auxiliary pipeline includes a third main road, a fourth main road, a fifth branch, and a sixth branch. The first branch, the second branch, the third branch, the fourth branch, the fifth branch, the sixth branch, and the safety branch form a set of branch groups. The system is also provided with a raw gas inlet 81, an output gas outlet 82, and a safety relief outlet 83. The raw gas inlet 81 is connected to the intake pipeline to supply gas. The output gas outlet 82 is connected to the outlet pipeline to exhaust gas. The safety relief outlet 83 is connected to the safety relief pipeline to perform safety relief.

[0023] The drying mechanism includes a first dryer 1, a second dryer 2, and a third dryer 3. The first dryer 1, the second dryer 2, and the third dryer 3 respectively correspond to a set of branch groups.

[0024] The regeneration mechanism includes a regeneration cooler 5, a regeneration heater 4, a regeneration gas flow regulating valve 71, and a regeneration gas-liquid separator 6. The regeneration cooler 5 is connected in series with the regeneration gas-liquid separator 6. The regeneration gas flow regulating valve 71 is located on the outlet pipeline. The feed end of the regeneration heater 4 is connected to the outlet pipeline between the regeneration gas flow regulating valve 71 and the second branch. The discharge end of the regeneration heater 4 is connected to the first main road. The second main road is connected to the inlet of the regeneration cooler 5. The outlet of the regeneration gas-liquid separator 6 is connected to the third main road. The fourth main road is connected to the drying mechanism and the outlet pipeline. A regeneration cooler 5 cooling water inlet and a regeneration cooler 5 cooling water outlet are also provided on the regeneration cooler 5.

[0025] The overpressure protection mechanism includes a safety valve 17 and a pressure transmitter 18. The safety valve 17 is arranged on the safety branch. The pressure transmitter 18 is connected to the third branch. The safety valve 17 and the pressure transmitter 18 are arranged in one-to-one correspondence with the branch groups. The safety valve 17 is used as the first overpressure protection device to achieve overpressure safety relief. The pressure transmitter 18 is respectively arranged on each dryer to be interlocked with the valves on the dryer to achieve overpressure safety relief of the dryer. This system broadens the working load flow range, designs overpressure protection devices for the dryer and the regeneration heater 4, and improves the safety of system operation. Particularly, it matches the off-grid hydrogen production conditions of wind and light, realizes the intermittent operation requirements, and can control the operating temperature of the dryer by changing the state of each dryer through the switching between control valve groups to solve the influence of interruption on the dryer.

[0026] The off-grid hydrogen production gas drying system according to the embodiments of the present utility model has the advantages of meeting the requirements of intermittent operation, strong anti-interference ability, and a large working load flow range.

[0027] In some embodiments, the inlet of the first dryer 1 is connected to the inlet pipeline through the first branch, the outlet of the first dryer 1 is connected to the outlet pipeline through the second branch, the third branch connects the first main path and the first branch, the fourth branch connects the second branch and the second main path, the regeneration gas-liquid separator 6 is connected to the auxiliary pipeline, the third main path is connected to the first branch through the fifth branch, and the sixth branch is connected to the fourth main path;

[0028] The inlet of the second dryer 2 is connected to the inlet pipeline through the first branch, the outlet of the second dryer 2 is connected to the outlet pipeline through the second branch, the third branch connects the first main path and the first branch, the fourth branch connects the second branch and the second main path, the third main path is connected to the first branch through the fifth branch, and the sixth branch is connected to the fourth main path;

[0029] The inlet of the third dryer 3 is connected to the inlet pipeline through the first branch, the outlet of the third dryer 3 is connected to the outlet pipeline through the second branch, the third branch connects the first main path and the first branch, the fourth branch connects the second branch and the second main path, the third main path is connected to the first branch through the fifth branch, and the sixth branch is connected to the fourth main path.

[0030] Specifically, the connection modes of the three dryers and the branch group are the same. The first branch and the second branch are used for the gas to enter and leave the dryer. The fourth branch introduces the gas into the regeneration cooler 5 and the regeneration gas-liquid separator 6 of the regeneration mechanism and then returns to the dryer through the fifth branch. Part of the gas on the outlet pipeline is processed by the regeneration heater 4 and then returns to the dryer through the first main path and the third branch. The sixth branch sends part of the gas on the second branch to the outlet pipeline through the fourth main path so that the gas does not enter the regeneration heater 4.

[0031] In some embodiments, the first dryer 1, the second dryer 2, and the third dryer 3 all have a working state inlet valve 11, a working state outlet valve 12, a regeneration state inlet valve 13, an auxiliary working state inlet valve 14, a regeneration state outlet valve 15, and an auxiliary working state outlet valve 16. The working state inlet valve 11 is located on the first branch, the working state outlet valve 12 is located on the second branch, the regeneration state inlet valve 13 is located on the third branch, the regeneration state outlet valve 15 is located on the fourth branch, the auxiliary working state inlet valve 14 is located on the fifth branch, and the auxiliary working state outlet valve 16 is located on the sixth branch.

[0032] Specifically, the dryer is provided with an air inlet valve and an air outlet valve corresponding to each working state to realize the switching of different working states. When entering the working adsorption state, the gas enters the dryer through the working state air inlet valve 11, and leaves the dryer through the working state air outlet valve 12 after adsorption. When entering the working waiting state, the working state air inlet valve 11, the working state air outlet valve 12, and the regeneration flow regulating valve are in the closed state; when entering the regeneration heating state, the regeneration state air inlet valve 13 and the regeneration state air outlet valve 15 are opened, and the gas enters the dryer through the regeneration state air inlet valve 13 for regeneration and then flows out through the regeneration state air outlet valve 15. The outflowing gas is cooled by the regeneration cooler 5 and then separated into gas and liquid in the regeneration gas-liquid separator 6; when entering the regeneration hot standby state When in the regeneration state, the regeneration state air inlet valve 13 and the regeneration state air outlet valve 15 are closed; when entering the regeneration cooling state, the gas flow direction is the same as that in the regeneration heating state, and the regeneration heater 4 does not work; when entering the regeneration waiting state, the regeneration state air inlet valve 13 and the regeneration state air outlet valve 15 are closed and the regeneration heater 4 does not work; when entering the auxiliary working state, the gas from the regeneration gas-liquid separator 6 enters the dryer through the auxiliary working state air inlet valve 14 for adsorption, and the adsorbed gas enters the fourth main path through the auxiliary working state air outlet valve 16, and is counted by the regeneration gas flowmeter 72 and then merged with the remaining gas in the air outlet pipe for discharge; when entering the auxiliary working waiting state, the auxiliary working state air inlet valve 14 and the auxiliary working state air outlet valve 16 are closed.

[0033] In some embodiments, the first dryer 1, the second dryer 2 and the third dryer 3 have the same structure. The first dryer 1 includes an insulation layer 111, a cylinder, a heating element 131 and a temperature transmitter 121. The insulation layer 111 is arranged on the outer surface of the cylinder to reduce the heat loss of the cylinder. At least three heating elements 131 are arranged between the cylinder and the insulation layer 111 to heat the cylinder. At least three temperature transmitters 121 are respectively arranged on the inner and outer sides of the cylinder to monitor the temperature of the cylinder.

[0034] Specifically, there are no less than 3 temperature transmitters 121 on the inside and outside of the cylinder, and the heating elements 131 are evenly arranged along the axial direction of the cylinder to uniformly heat the cylinder. The temperature transmitters 121 on the inside and outside of the cylinder can be arranged correspondingly to ensure that the temperature detection structure can accurately reflect the temperature difference between the inside and outside of the cylinder.

[0035] In some embodiments, a regeneration heating outlet pressure transmitter 41 is arranged on one side of the first main circuit adjacent to the discharge end of the regeneration heater 4, the first main circuit is connected to the safety pressure relief pipeline through a branch pipeline, the regeneration vent valve 43 and the regeneration outlet safety valve 42 are located on different branch pipelines and connected in parallel, a regeneration cooling water inlet 51 and a regeneration cooling water outlet 52 are arranged on the regeneration cooler 5, and a sewage outlet 61 is arranged on the regeneration gas-liquid separator 6.

[0036] Specifically, there are two branch pipelines on the first main pipeline connected to the safety relief pipeline. The regeneration vent valve 43 and the regeneration outlet safety valve 42 are respectively arranged on a branch pipeline. The regeneration outlet safety valve 42 can independently achieve overpressure protection for the regeneration heater 4. The pressure transmitter 18 of the dryer cooperates with the regeneration heating outlet pressure transmitter 41 and the regeneration vent valve 43 to form a second overpressure protection for the regeneration heater 4. The two overpressure protections can ensure the system pressure stability and safety, and avoid increasing the system safety risk due to the damage of a single overpressure protection failure.

[0037] In some embodiments, the off-grid hydrogen production gas drying system further includes a pressure regulating mechanism. The pressure regulating mechanism includes an output gas flowmeter 73 and an output gas pressure transmitter 74 arranged in sequence on the outlet pipeline. The regeneration gas flowmeter 72 is located on the pipeline between the second main pipeline and the outlet pipeline. The outlet pipeline is connected to the output gas outlet 82. A plurality of output gas pressure regulating valves 75 are located on the side of the outlet pipeline adjacent to the output gas outlet 82 and are connected in parallel with each other.

[0038] Specifically, there may be three output gas pressure regulating valves 75. The three valves are connected in parallel on the outlet pipeline. On the outlet pipeline, as the outlet pipeline extends towards the output gas outlet 82, the outlet pipeline is successively connected to the second branch of the first dryer 1, the second dryer 2, and the third dryer 3, connected to the regeneration heater 4, and connected to the fourth main pipeline. The regeneration gas flow regulating valve 71 is located between the connection point between the outlet pipeline and the regeneration heater 4 and the connection point between the outlet pipeline and the fourth main pipeline.

[0039] In some embodiments, the pressure regulating mechanism includes three output gas pressure regulating valves 75. The flow regulation range of the first output gas pressure regulating valve 75 is N1 to X0, the flow regulation range of the second output gas pressure regulating valve 75 is N2 to N3, and the flow regulation range of the third output gas pressure regulating valve 75 is N4 to N5, where N5 < N4 < N3 < N2 < N1 < X0.

[0040] Specifically, N5 < N4 < N3 < N2 < N1 < X0, and N5 = X1min enables the output gas pressure to be adjustable within a wide load range. The regulation ranges of the three output gas pressure regulating valves 75 are staggered from each other to maximize the regulation range to meet the wide load requirements and avoid the narrow regulation range caused by a single regulating valve. It can be understood that the number of output gas pressure regulating valves 75 can be greater than three to further expand the regulation range.

[0041] The off-grid hydrogen production gas drying method according to the present system includes the following steps:

[0042] The gas drying device includes three dryers, namely the first dryer 1, the second dryer 2, and the third dryer 3. The first dryer 1, the second dryer 2, and the third dryer 3 all have a working state, a regeneration state, and an auxiliary working state. The working state includes a working adsorption state and a working waiting state. The regeneration state includes a regeneration heating state, a regeneration hot standby state, a regeneration blowing and cooling state, and a regeneration waiting state. The auxiliary working state includes an auxiliary working adsorption state and an auxiliary working waiting state. The states of the gas drying device cycle in sequence through the working state, the regeneration state, and the auxiliary working state. The first dryer 1, the second dryer 2, and the third dryer 3 all have a working state inlet valve 11, a working state outlet valve 12, a regeneration state inlet valve 13, an auxiliary working state inlet valve 14, a regeneration state outlet valve 15, and an auxiliary working state outlet valve 16. The regeneration mechanism includes a regeneration cooler 5, a regeneration heater 4, and a regeneration gas-liquid separator 6. The regeneration cooler 5 is connected in series with the regeneration gas-liquid separator 6. The regeneration outlet safety valve 42, the regeneration heating outlet pressure transmitter 41, and the regeneration vent valve 43 at the discharge end of the regeneration heater 4 cooperate for overpressure safety relief. The pressure regulating mechanism includes a plurality of output gas pressure regulating valves 75. The outlet pipeline is connected to the output gas outlet 82. The plurality of output gas pressure regulating valves 75 are located on one side of the outlet pipeline adjacent to the output gas outlet 82 and are connected in parallel with each other;

[0043] The first dryer 1, the second dryer 2, and the third dryer 3 are in the working state, the regeneration state, and the auxiliary working state in sequence. The working adsorption state and the working waiting state, the auxiliary working adsorption state and the auxiliary working waiting state are both repeated once to match the regeneration state;

[0044] If any one of the first dryer 1, the second dryer 2, and the third dryer 3 is interrupted during the regeneration heating state, the corresponding dryer enters the regeneration hot standby state. After the regeneration hot standby state ends, it re-enters the regeneration heating state. The dryers in the working state and the auxiliary working state repeat the cycle to match the dryer in the regeneration state;

[0045] If any dryer in the gas drying device that is in the regeneration heating state is interrupted again, the corresponding dryer enters the regeneration hot standby state. After the regeneration hot standby state ends, it re-enters the regeneration heating state. The dryers in the working state and the auxiliary working state repeat the cycle to match the dryer in the regeneration state;

[0046] If any one of the first dryer 1, the second dryer 2, and the third dryer 3 is interrupted during the regeneration blowing and cooling state, the corresponding dryer enters the regeneration waiting state. After the regeneration waiting state ends, it re-enters the regeneration blowing and cooling state. The dryers in the working state and the auxiliary working state repeat the cycle to match the dryer in the regeneration state;

[0047] If any dryer in the gas drying device that is in the regeneration blowing and cooling state experiences an interruption again, the corresponding dryer enters the regeneration waiting state. After the regeneration waiting state ends, it re-enters the regeneration blowing and cooling state. The dryers in the working state and the auxiliary working state repeat the cycle to match the dryer in the regeneration state.

[0048] The specific working steps of the gas drying device are as follows:

[0049] S1: The first dryer 1 is in the working adsorption state, the second dryer 2 is in the regeneration heating state, and the third dryer 3 is in the auxiliary working adsorption state.

[0050] S2: The first dryer 1 is in the working waiting state, the second dryer 2 is in the regeneration standby state, and the third dryer 3 is in the auxiliary working waiting state.

[0051] S3: The first dryer 1 is in the working adsorption state, the second dryer 2 is in the regeneration blowing and cooling state, and the third dryer 3 is in the auxiliary working adsorption state.

[0052] S4: The first dryer 1 is in the working waiting state, the second dryer 2 is in the regeneration waiting state, and the third dryer 3 is in the auxiliary working waiting state.

[0053] S5: The first dryer 1 is in the regeneration heating state, the second dryer 2 is in the auxiliary working adsorption state, and the third dryer 3 is in the working adsorption state.

[0054] S6: The first dryer 1 is in the regeneration standby state, the second dryer 2 is in the auxiliary working waiting state, and the third dryer 3 is in the working waiting state.

[0055] S7: The first dryer 1 is in the regeneration blowing and cooling state, the second dryer 2 is in the auxiliary working adsorption state, and the third dryer 3 is in the working adsorption state.

[0056] S8: The first dryer 1 is in the regeneration waiting state, the second dryer 2 is in the auxiliary working waiting state, and the third dryer 3 is in the working waiting state.

[0057] S9: The first dryer 1 is in the auxiliary working adsorption state, the second dryer 2 is in the working adsorption state, and the third dryer 3 is in the regeneration heating state.

[0058] S10: The first dryer 1 is in the auxiliary working waiting state, the second dryer 2 is in the working waiting state, and the third dryer 3 is in the regeneration standby state.

[0059] S11: The first dryer 1 is in the auxiliary working adsorption state, the second dryer 2 is in the working adsorption state, and the third dryer 3 is in the regeneration blowing and cooling state.

[0060] S12: The first dryer 1 is in the auxiliary working waiting state, the second dryer 2 is in the working waiting state, and the third dryer 3 is in the regeneration waiting state.

[0061] The basic cycle of the dryer working state is S1 - S3, S5 - S7, S9 - S11, S1 - S3. When an interruption occurs during the basic cycle of the dryer, corresponding steps are repeated according to the different states of the dryer at the time of interruption. For example, when an interruption occurs during the regeneration heating state, steps S1, S5, and S9 are replaced by S1 - S2 - S1, S5 - S6 - S5, S9 - S10 - S9 to complete the repetition of the regeneration heating - regeneration standby - regeneration heating steps. When an interruption occurs during the regeneration blowing and cooling state, S3, S7, and S11 are replaced by S3 - S4 - S3, S7 - S8 - S7, S11 - S12 - S11.

[0062] The dryer of the gas drying device allows a maximum raw material gas flow rate X0 to enter in the working adsorption state. All the raw material gas flow rate X1 in the working adsorption state enters the corresponding dryer through the working state inlet valve 11, and after adsorption, it is output through the working state outlet valve 12. A part of the gas flow rate X2 is adjusted for regeneration, and X2 is a non - fixed value. Another part of the gas flow rate X3 is combined with the reflux gas flow rate X2 after regeneration and then output after metering, where 0 < X1 ≤ X0, and X1 = X2 + X3; when X1 = 0, the corresponding dryer changes from the working adsorption state to the working waiting state, and the working state inlet valve 11, outlet valve, and regeneration flow regulating valve of the corresponding dryer are in the closed state;

[0063] In the regeneration heating state of the dryer of the gas drying device, a part of the gas flow rate X2 is heated to the set temperature of T0 °C by the regeneration heater 4 and then flows into the dryer in the regeneration state. After treatment, the gas enters the regeneration cooler 5 for cooling and then undergoes regeneration gas - liquid separation, where 0 < X2 ≤ X1; when X2 = 0, it changes from the regeneration heating state to the regeneration standby state, and the regeneration state inlet valve 13 and the regeneration state outlet valve 15 are in the closed state. In the regeneration blowing and cooling state, the flow direction of a part of the gas flow rate X2 is the same as that in the regeneration heating state, and the regeneration heater 4 is in the non - heating state, where 0 < X2 ≤ X1; when X2 = 0, the regeneration blowing and cooling state changes to the regeneration waiting state, the regeneration state inlet valve 13 and the regeneration state outlet valve 15 are in the closed state, and the regeneration heater 4 is in the non - heating state;

[0064] When the dryer of the gas drying device is in the auxiliary working adsorption state, a part of the gas flow rate X2 flowing out from the regeneration gas-liquid separation flows into the dryer in the auxiliary working state. After adsorption, the dried gas converges with another part of the gas flow rate X3 and then is output, where 0 < X2 ≤ X1, and X1 = X2 + X3; when X2 = 0, the auxiliary working adsorption state changes to the auxiliary working waiting state, and the intake valve 14 and the outlet valve 16 in the auxiliary working state are in the closed state.

[0065] The magnitude of X2 is adjusted by the cooperation of the regeneration gas flow regulating valve 71 and the regeneration gas flowmeter 72. The regeneration gas flow rate is 0 < X2 ≤ X1 ≤ X0. X2 is not a fixed value and has a relatively wide flow range. The regeneration heater 4 can be configured with a controllable power regulating component. On the one hand, it can effectively prevent local overheating and rupture of the heating core of the regeneration heater 4 caused by too low a flow rate. On the other hand, it can control the heater temperature control accuracy within the range of ±2°C, and accurately control the interval temperature to effectively solve the impact of regeneration interruption on the regeneration effect.

[0066] During the regeneration heating state process, when X2 = 0, multiple heating elements 131 outside the dryer cylinder body are in the heating state to maintain the temperature inside the dryer cylinder body at A°C; when the regeneration hot standby state changes back to the regeneration heating state again, that is, when X2 > 0, the temperature inside the dryer cylinder body is at B°C, and the absolute value of the difference between A and B is less than or equal to 3.

[0067] When the number of internal and external temperature transmitters 121 in the cylinder body is 3, the temperatures of the three internal temperature transmitters 121 are T1°C, T2°C, and T3°C, and the temperatures of the three external temperature transmitters 121 are T4°C, T5°C, and T6°C. It can be understood that T4 < T1, T5 < T2, T6 < T3, that is, the external temperature is lower than the internal temperature. The heating elements are in the heating state, which can heat the cylinder body and reduce the heat loss of the cylinder body, reduce the required flow rate of the regeneration gas, that is, reduce the intake flow rate of the raw material gas, and broaden the working load flow range; when T4 = T1, T5 = T2, T6 = T3, the corresponding heating elements 131 are in the non-heating state. The heating elements 131 can adopt the form of high-temperature electric tracing, but are not limited to other forms such as steam tracing. Controlling the temperature difference between the inside and outside within 3°C is beneficial to realizing the accurate control of the dryer interval temperature during the regeneration heating interruption, avoiding the impact of heating interruption on the regeneration effect, and enabling the gas drying device to operate intermittently.

[0068] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0069] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0070] In the present utility model, unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0071] In the present utility model, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0072] In the present utility model, terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0073] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Any changes, modifications, substitutions, and variations made by those of ordinary skill in the art to the above embodiments are within the protection scope of the present utility model.

Claims

1. An off-grid hydrogen production gas drying system, characterized in that, Comprising: A drying mechanism, a regeneration mechanism and an overpressure protection mechanism. The intake pipeline is connected to the outlet pipeline through a working pipeline. The safety relief pipeline is connected to the drying mechanism through a safety branch. The regeneration mechanism is connected to the drying mechanism through a regeneration pipeline and an auxiliary pipeline. The working pipeline includes a first branch and a second branch. The regeneration pipeline includes a first main path, a second main path, a third branch and a fourth branch. The auxiliary pipeline includes a third main path, a fourth main path, a fifth branch and a sixth branch. The first branch, the second branch, the third branch, the fourth branch, the fifth branch, the sixth branch and the safety branch form a set of branch groups; The drying mechanism includes a first dryer, a second dryer and a third dryer. The first dryer, the second dryer and the third dryer respectively correspond to a set of the branch groups; The regeneration mechanism includes a regeneration cooler, a regeneration heater, a regeneration gas flow regulating valve and a regeneration gas-liquid separator. The regeneration cooler is connected in series with the regeneration gas-liquid separator. The regeneration gas flow regulating valve is located on the outlet pipeline. The feed end of the regeneration heater is connected to the outlet pipeline between the regeneration gas flow regulating valve and the second branch. The discharge end of the regeneration heater is connected to the first main path. The second main path is connected to the inlet of the regeneration cooler. The outlet of the regeneration gas-liquid separator is connected to the third main path. The fourth main path is connected to the drying mechanism and the outlet pipeline; The overpressure protection mechanism includes a safety valve and a pressure transmitter. The safety valve is arranged on the safety branch. The pressure transmitter is connected to the third branch. The safety valve and the pressure transmitter are arranged in one-to-one correspondence with the branch groups.

2. The off-grid hydrogen production gas drying system according to claim 1, wherein The inlet of the first dryer is connected to the intake pipeline through the first branch. The outlet of the first dryer is connected to the outlet pipeline through the second branch. The third branch connects the first main path to the first branch. The fourth branch connects the second branch to the second main path. The regeneration gas-liquid separator is connected to the auxiliary pipeline. The third main path is connected to the first branch through the fifth branch. The sixth branch is connected to the fourth main path; The inlet of the second dryer is connected to the intake pipeline through the first branch. The outlet of the first dryer is connected to the outlet pipeline through the second branch. The third branch connects the first main path to the first branch. The fourth branch connects the second branch to the second main path. The third main path is connected to the first branch through the fifth branch. The sixth branch is connected to the fourth main path; The air inlet of the third dryer is connected to the intake pipeline through the first branch; the air outlet of the first dryer is connected to the outlet pipeline through the second branch; the third branch connects the first main path to the first branch; the fourth branch connects the second branch to the second main path; the third main path is connected to the first branch through the fifth branch; the sixth branch is connected to the fourth main path.

3. The off-grid hydrogen production gas drying system according to claim 2, wherein The first dryer, the second dryer, and the third dryer each have an intake valve in the working state, an outlet valve in the working state, an intake valve in the regeneration state, an intake valve in the auxiliary working state, an outlet valve in the regeneration state, and an outlet valve in the auxiliary working state. The intake valve in the working state is located on the first branch; the outlet valve in the working state is located on the second branch; the intake valve in the regeneration state is located on the third branch; the outlet valve in the regeneration state is located on the fourth branch; the intake valve in the auxiliary working state is located on the fifth branch; the outlet valve in the auxiliary working state is located on the sixth branch.

4. The off-grid hydrogen production gas drying system according to claim 1, characterized in that, The first dryer, the second dryer, and the third dryer have the same structure. The first dryer includes a thermal insulation layer, a cylinder body, heating elements, and a temperature transmitter. The thermal insulation layer is arranged on the outer surface of the cylinder body to reduce heat loss of the cylinder body. At least three heating elements are arranged between the cylinder body and the thermal insulation layer to heat the cylinder body. At least three temperature transmitters are respectively arranged on the inner and outer sides of the cylinder body to monitor the temperature of the cylinder body.

5. The off-grid hydrogen production gas drying system according to claim 1, characterized in that, A regeneration heating outlet pressure transmitter is arranged on one side of the first main path near the discharge end of the regeneration heater. The first main path is connected to the safety relief pipeline through a branch pipeline. The regeneration vent valve and the regeneration outlet safety valve are located on different branch pipelines and are in parallel. The regeneration cooler is provided with a regeneration cooling water inlet and a regeneration cooling water outlet. The regeneration gas-liquid separator is provided with a drain port.

6. The off-grid hydrogen production gas drying system according to claim 1, wherein, It further includes a pressure regulating mechanism. The pressure regulating mechanism includes an output gas flowmeter and an output gas pressure transmitter arranged in sequence on the outlet pipeline. The regeneration gas flowmeter is located on the pipeline between the second main path and the outlet pipeline. The outlet pipeline is connected to the output gas outlet. A plurality of output gas pressure regulating valves are located on the side of the outlet pipeline adjacent to the output gas outlet and are in parallel with each other.

7. The off-grid hydrogen production gas drying system according to claim 6, wherein, The pressure regulating mechanism includes three output gas pressure regulating valves. The regulating flow range of the first output gas pressure regulating valve is N1 to X0; the regulating flow range of the second output gas pressure regulating valve is N2 to N3; the regulating flow range of the third output gas pressure regulating valve is N4 to N5, where N5 < N4 < N3 < N2 < N1 < X0.

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