Hydrogen production and hydrogenation integrated station control method

Abstract

The application discloses a hydrogen production and hydrogenation integrated station control method, which comprises hydrogen production equipment, a hydrogen buffer tank, a first-stage compressor, a first-stage hydrogen storage tank, a second-stage compressor, a second-stage hydrogen storage tank and hydrogenation equipment which are sequentially connected; during hydrogenation, the hydrogen production equipment, the first-stage compressor, the second-stage compressor and the hydrogenation equipment are controlled to work according to the relationship between the pressures of the hydrogen buffer tank, the first-stage hydrogen storage tank, the second-stage hydrogen storage tank and the hydrogenation equipment when the hydrogenation equipment works and the maximum filling pressure allowed for the hydrogenation equipment, the first preset pressure, the second preset pressure, the maximum allowable working pressure of the second-stage hydrogen storage tank, the fourth preset pressure, the minimum inlet air pressure of the first-stage compressor, the maximum allowable working pressure of the first-stage hydrogen storage tank, the third preset pressure, the maximum allowable working pressure of the hydrogen buffer tank and the minimum inlet air pressure of the second-stage compressor. The application realizes on-demand start and stop of hydrogen production, reduces loss, prolongs the service life of equipment, reduces cost and production hidden danger.

Description

Technical Field

[0001] This invention relates to the field of hydrogen energy storage and charging technology, and in particular to a control method for an integrated hydrogen production and refueling station. Background Technology

[0002] Currently, hydrogen production stations and hydrogen refueling stations are controlled separately. The refueling rate depends on the storage capacity and pressure of the hydrogen storage tank. Hydrogen production equipment and compressors start and stop randomly, resulting in high equipment wear and tear. Manual monitoring of pressure to start and stop equipment leads to response delays. In practical applications, this has the following drawbacks:

[0003] 1. The supply and demand coordination between hydrogen production and hydrogen refueling is not well coordinated. Traditional hydrogen refueling stations rely on hydrogen storage tanks for hydrogen supply, which can easily lead to insufficient hydrogen supply or pressure fluctuations during peak refueling periods, resulting in a decrease in the refueling speed.

[0004] 2. Frequent start-ups and shutdowns of hydrogen production equipment and compressors, or prolonged low-load operation, lead to increased energy consumption;

[0005] 3. Systems without coordinated control can lead to frequent start-stop or low-load operation of equipment such as compressors and electrolytic cells, resulting in reduced service life, increased costs, and potential production risks.

[0006] 4. Operators manually judge the equipment status and start or stop the equipment manually, which carries a high risk of misoperation.

[0007] Therefore, how to achieve fully automated operation of the entire hydrogen refueling and hydrogen production station, reduce disordered start-up and shutdown of equipment, reduce losses, increase hydrogen refueling speed, extend equipment lifespan, reduce manual operation, and reduce costs and production risks has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0008] In view of the above-mentioned deficiencies of the prior art, the present invention provides a control method for an integrated hydrogen production and hydrogen refueling station, which realizes fully automatic operation of the entire station in conjunction with hydrogen production and refueling, reduces disordered start-up and shutdown of equipment, reduces losses, increases hydrogen refueling speed, extends equipment lifespan, reduces manual operation, and reduces costs and production risks.

[0009] To achieve the above objectives, the present invention discloses a control method for an integrated hydrogen production and refueling station. The integrated hydrogen production and refueling station includes a hydrogen production device, a hydrogen buffer tank, a primary compressor, a primary hydrogen storage tank, a secondary compressor, a secondary hydrogen storage tank, and a hydrogen refueling device connected in sequence. The hydrogen refueling device is used to refuel hydrogen to the receiving device that needs to be refueled.

[0010] At the start of hydrogen refueling, check whether the pressure PT2 of the secondary hydrogen storage tank is greater than or equal to the third preset pressure P7;

[0011] If PT2≥P7, execute steps A1 and A2; otherwise, execute step C.

[0012] Step A1: The hydrogenation equipment adds hydrogen to the receiving equipment;

[0013] Step A2: Monitor the pressure PT2 of the secondary hydrogen storage tank and the pressure PT3 of the injection equipment, and compare whether PT2 is greater than or equal to the first preset pressure P1;

[0014] If PT2≤P1, proceed to step C; otherwise, proceed to steps B1 and B2.

[0015] Step B1: Adjust the pressure PT3 of the receiving device to match the maximum allowable pressure P0 of the receiving device, and then inject hydrogen into the receiving device;

[0016] Step B2: Complete hydrogen refueling and shut down the hydrogen refueling equipment;

[0017] Step C: Check whether the pressure PT1 of the primary hydrogen storage tank is greater than or equal to the second preset pressure P2;

[0018] If PT1≥P2, execute steps D1 and D2; otherwise, execute step E.

[0019] Step D1: Start the secondary compressor and monitor the pressure PT2 of the secondary hydrogen storage tank and the pressure PT1 of the primary hydrogen storage tank in real time;

[0020] Step D2: When the pressure PT2 of the secondary hydrogen storage tank is equal to the maximum allowable working pressure P3 of the secondary hydrogen storage tank, or the pressure PT1 of the primary hydrogen storage tank is equal to the minimum inlet pressure P9 of the secondary compressor, shut down the secondary compressor.

[0021] Step E: Check whether the maximum allowable injection pressure P0 of the injection device is greater than or equal to the fourth preset pressure P4;

[0022] If PT0≥P4, then execute steps F1 and F2; otherwise, execute step G.

[0023] Step F1: Start the first-stage compressor and monitor the pressure PT1 of the first-stage hydrogen storage tank and the pressure PT0 of the hydrogen buffer tank in real time;

[0024] Step F2: When the pressure PT1 of the primary hydrogen storage tank is equal to the maximum allowable working pressure P6 of the primary hydrogen storage tank, or the pressure PT0 of the hydrogen buffer tank is equal to the minimum inlet pressure P5 of the primary compressor, shut down the primary compressor.

[0025] Step G: Turn on the hydrogen production equipment and monitor the pressure PT0 of the hydrogen buffer tank in real time. When PT0 reaches the maximum allowable working pressure P8 of the hydrogen buffer tank, turn off the hydrogen production equipment.

[0026] Preferably, the third preset pressure P7 is at least 3 MPa greater than the maximum allowable injection pressure P0 of the injection receiving device; the first preset pressure P1 is at least 1 MPa greater than the maximum allowable injection pressure P0 of the injection receiving device; the second preset pressure P2 is at least 5 MPa greater than the minimum intake pressure of the secondary compressor; and the fourth preset pressure P4 is at least 1 MPa greater than the minimum intake pressure of the primary compressor.

[0027] The beneficial effects of this invention are:

[0028] This invention enables dynamic pressurization of two-stage storage tanks, maintains constant hydrogen refueling pressure to improve hydrogen refueling efficiency, and reduces the situation of "hydrogen waiting for the vehicle".

[0029] This invention enables on-demand start-up and shutdown, reducing ineffective operation and lowering power consumption by 20% to 30%.

[0030] The pressure interlock protection of each pressure vessel in this invention extends the compressor's lifespan by more than 30% when operating under optimal conditions.

[0031] This invention enables automatic pressure monitoring and emergency shutdown, reducing the risk of leakage and overpressure.

[0032] The following will further explain the concept, specific structure, and technical effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Attached Figure Description

[0033] Figure 1 A schematic diagram of the structure of an integrated hydrogen production and refueling station according to an embodiment of the present invention is shown.

[0034] Figure 2 The diagram shows the working logic flowchart of the hydrogen production and refueling integrated station during hydrogen refueling in one embodiment of the present invention. Detailed Implementation

[0035] Example

[0036] like Figure 1 and Figure 2 As shown, the control method for an integrated hydrogen production and refueling station includes a hydrogen production device, a hydrogen buffer tank, a primary compressor, a primary hydrogen storage tank, a secondary compressor, a secondary hydrogen storage tank, and a hydrogen refueling device connected in sequence. The hydrogen refueling device then refuels the receiving device that needs to be refueled with hydrogen.

[0037] At the start of hydrogen refueling, check whether the pressure PT2 of the secondary hydrogen storage tank is greater than or equal to the third preset pressure P7;

[0038] If PT2≥P7, execute steps A1 and A2; otherwise, execute step C.

[0039] Step A1: The hydrogenation equipment adds hydrogen to the receiving equipment;

[0040] Step A2: Monitor the pressure PT2 of the secondary hydrogen storage tank and the pressure PT3 of the injection equipment, and compare whether PT2 is greater than or equal to the first preset pressure P1;

[0041] If PT2≤P1, proceed to step C; otherwise, proceed to steps B1 and B2.

[0042] Step B1: Adjust the pressure PT3 of the receiving device to match the maximum allowable pressure P0 of the receiving device, and then inject hydrogen into the receiving device.

[0043] Step B2: Complete hydrogen refueling and turn off the hydrogen refueling equipment;

[0044] Step C: Check whether the pressure PT1 of the primary hydrogen storage tank is greater than or equal to the second preset pressure P2;

[0045] If PT1≥P2, execute steps D1 and D2; otherwise, execute step E.

[0046] Step D1: Start the secondary compressor and monitor the pressure PT2 of the secondary hydrogen storage tank and the pressure PT1 of the primary hydrogen storage tank in real time;

[0047] Step D2: When the pressure PT2 of the secondary hydrogen storage tank is equal to the maximum allowable working pressure P3 of the secondary hydrogen storage tank, or the pressure PT1 of the primary hydrogen storage tank is equal to the minimum inlet pressure P9 of the secondary compressor, shut down the secondary compressor.

[0048] Step E: Check whether the maximum allowable injection pressure P0 of the injection equipment is greater than or equal to the fourth preset pressure P4;

[0049] If PT0≥P4, then execute steps F1 and F2; otherwise, execute step G.

[0050] Step F1: Start the primary compressor and monitor the pressure PT1 of the primary hydrogen storage tank and the pressure PT0 of the hydrogen buffer tank in real time.

[0051] Step F2: When the pressure PT1 of the primary hydrogen storage tank is equal to the maximum allowable working pressure P6 of the primary hydrogen storage tank, or the pressure PT0 of the hydrogen buffer tank is equal to the minimum inlet pressure P5 of the primary compressor, shut down the primary compressor.

[0052] Step G: Turn on the hydrogen production equipment and monitor the pressure PT0 of the hydrogen buffer tank in real time. When PT0 reaches the maximum allowable working pressure P8 of the hydrogen buffer tank, turn off the hydrogen production equipment.

[0053] This invention employs a two-stage dynamic pressure management system for hydrogen storage tanks, performs graded pressure replenishment for the equipment, features intelligent equipment start-up and shutdown logic, a condition-triggered control mechanism, and provides closed-loop feedback on conditions, enabling on-demand hydrogen production and compression.

[0054] In some embodiments, the third preset pressure P7 is more than 3 MPa greater than the maximum pressure P0 allowed to be added by the receiving device; the first preset pressure P1 is more than 1 MPa greater than the maximum pressure P0 allowed to be added by the receiving device; the second preset pressure P2 is more than 5 MPa greater than the minimum intake pressure of the second stage compressor; and the fourth preset pressure P4 is more than 1 MPa greater than the minimum intake pressure of the first stage compressor.

[0055] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A control method for an integrated hydrogen production and refueling station; characterized in that, The integrated hydrogen production and refueling station includes a hydrogen production device, a hydrogen buffer tank, a primary compressor, a primary hydrogen storage tank, a secondary compressor, a secondary hydrogen storage tank, and a hydrogen refueling device connected in sequence, and refuels hydrogen to the receiving device that needs to be refueled through the hydrogen refueling device; At the start of hydrogen refueling, check whether the pressure PT2 of the secondary hydrogen storage tank is greater than or equal to the third preset pressure P7; If PT2≥P7, execute steps A1 and A2; otherwise, execute step C. Step A1: The hydrogenation equipment adds hydrogen to the receiving equipment; Step A2: Monitor the pressure PT2 of the secondary hydrogen storage tank and the pressure PT3 of the injection equipment, and compare whether PT2 is greater than or equal to the first preset pressure P1; If PT2≤P1, proceed to step C; otherwise, proceed to steps B1 and B2. Step B1: Adjust the pressure PT3 of the receiving device to match the maximum allowable pressure P0 of the receiving device, and then inject hydrogen into the receiving device; Step B2: Complete hydrogen refueling and shut down the hydrogen refueling equipment; Step C: Check whether the pressure PT1 of the primary hydrogen storage tank is greater than or equal to the second preset pressure P2; If PT1≥P2, execute steps D1 and D2; otherwise, execute step E. Step D1: Start the secondary compressor and monitor the pressure PT2 of the secondary hydrogen storage tank and the pressure PT1 of the primary hydrogen storage tank in real time; Step D2: When the pressure PT2 of the secondary hydrogen storage tank is equal to the maximum allowable working pressure P3 of the secondary hydrogen storage tank, or the pressure PT1 of the primary hydrogen storage tank is equal to the minimum inlet pressure P9 of the secondary compressor, shut down the secondary compressor. Step E: Check whether the maximum allowable injection pressure P0 of the injection device is greater than or equal to the fourth preset pressure P4; If PT0≥P4, then execute steps F1 and F2; otherwise, execute step G. Step F1: Start the first-stage compressor and monitor the pressure PT1 of the first-stage hydrogen storage tank and the pressure PT0 of the hydrogen buffer tank in real time; Step F2: When the pressure PT1 of the primary hydrogen storage tank is equal to the maximum allowable working pressure P6 of the primary hydrogen storage tank, or the pressure PT0 of the hydrogen buffer tank is equal to the minimum inlet pressure P5 of the primary compressor, shut down the primary compressor. Step G: Turn on the hydrogen production equipment and monitor the pressure PT0 of the hydrogen buffer tank in real time. When PT0 reaches the maximum allowable working pressure P8 of the hydrogen buffer tank, turn off the hydrogen production equipment.

2. The control method for an integrated hydrogen production and refueling station according to claim 1, characterized in that, The third preset pressure P7 is more than 3 MPa greater than the maximum allowable injection pressure P0 of the injection receiving device; the first preset pressure P1 is more than 1 MPa greater than the maximum allowable injection pressure P0 of the injection receiving device; the second preset pressure P2 is more than 5 MPa greater than the minimum intake pressure of the secondary compressor; and the fourth preset pressure P4 is more than 1 MPa greater than the minimum intake pressure of the primary compressor.

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