Control method for hydrogen production and hydrogenation integrated station

Abstract

The invention discloses a control method for a hydrogen production and hydrogenation integrated station. The hydrogen production and hydrogenation integrated station comprises hydrogen production equipment, a hydrogen buffer tank, a primary compressor, a primary hydrogen storage tank, a secondary compressor, a secondary hydrogen storage tank and hydrogenation equipment which are connected in sequence; in the hydrogenation process, according to the working pressure of the hydrogen buffer tank, the first-stage hydrogen storage tank, the second-stage hydrogen storage tank and the injected equipment, the maximum allowable injection pressure of the injected 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 and the minimum gas inlet pressure of the first-stage compressor, the maximum allowable injection pressure of the injected equipment, the maximum allowable injection pressure of the injected equipment, the maximum allowable injection pressure of the injected equipment and the minimum gas inlet pressure of the second-stage compressor; and the hydrogen production equipment, the first-stage compressor, the second-stage compressor and the hydrogenation equipment are controlled to work according to the relation among 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 gas inlet pressure of the second-stage compressor. The on-demand starting and stopping of hydrogen production are realized, the loss is reduced, the service life of equipment is prolonged, and the cost and production hidden dangers are reduced.

Description

Technical Field

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

[0002] Existing hydrogen production stations and hydrogen refueling stations are controlled separately. The speed of hydrogen refueling depends on the storage capacity and pressure of the hydrogen storage tank. The hydrogen production equipment and compressor are started and stopped in an unordered manner, resulting in large equipment losses. Manual pressure monitoring to start and stop the equipment causes response delays. In practical applications, there are the following shortcomings:

[0003] 1. The supply and demand of hydrogen production and refueling are not coordinated enough. Traditional hydrogen refueling stations rely on hydrogen storage tanks for hydrogen supply. During the peak period of hydrogen refueling, hydrogen supply shortage or pressure fluctuations are prone to occur, resulting in a decrease in hydrogen refueling speed.

[0004] 2. Frequent start and stop of hydrogen production equipment and compressors, or long-term low-load operation, resulting in increased energy consumption;

[0005] 3. A system without coordinated control will cause compressors, electrolyzers and other equipment to frequently start and stop or operate at low load, resulting in a reduced service life, increased costs and production risks.

[0006] 4. Operators manually judge the equipment status and start and stop the equipment manually, which increases the risk of misoperation.

[0007] Therefore, how to achieve fully automatic operation of the entire station in the linkage of hydrogenation and hydrogen production, reduce disorderly start and stop of equipment, reduce losses, increase hydrogenation speed, increase equipment service life, reduce manual operations, reduce costs and production risks has become a technical problem that technical personnel in this field urgently need to solve. Summary of the Invention

[0008] In view of the above-mentioned defects of the prior art, the present invention provides a control method for an integrated hydrogen production and hydrogenation station to realize fully automatic operation of the entire station for hydrogenation and hydrogenation, reduce disorderly start and stop of equipment, reduce losses, increase hydrogenation speed, increase equipment service life, reduce manual operations, and reduce costs and production risks.

[0009] To achieve the above-mentioned object, the present invention discloses a control method for a hydrogen production and hydrogenation integrated station, which 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 hydrogenation device connected in sequence, and hydrogen is added to a receiving device that needs to be filled with hydrogen through the hydrogenation device;

[0010] At the beginning of hydrogenation, 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 fills the receiving equipment;

[0013] Step A2: monitoring the pressure PT2 of the secondary hydrogen storage tank and the pressure PT3 of the injection receiving device, and comparing whether PT2 is greater than or equal to a first preset pressure P1;

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

[0015] Step B1, adjusting the pressure PT3 of the receiving equipment to be consistent with the maximum pressure P0 allowed for filling of the receiving equipment, and filling the receiving equipment with hydrogen;

[0016] Step B2: After hydrogen filling is completed, the hydrogenation equipment is closed;

[0017] Step C, checking whether the pressure PT1 of the first-level 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, starting the secondary compressor and monitoring 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 intake pressure P9 of the secondary compressor, shut down the secondary compressor;

[0021] Step E: Check whether the maximum pressure P0 allowed for filling of the receiving device is greater than or equal to a fourth preset pressure P4;

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

[0023] Step F1, starting the first-stage compressor and monitoring 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: Start 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, shut down the hydrogen production equipment.

[0026] Preferably, the third preset pressure P7 is more than 3 MPa greater than the maximum pressure P0 allowed for filling by the receiving equipment; the first preset pressure P1 is more than 1 MPa greater than the maximum pressure P0 allowed for filling by the receiving equipment; 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.

[0027] Beneficial effects of the present invention:

[0028] The present invention can realize dynamic pressure replenishment of two-stage storage tanks, maintain constant hydrogenation pressure, improve hydrogenation efficiency, and reduce the situation of "waiting for hydrogen vehicles".

[0029] The present invention can realize on-demand start and stop, reduce ineffective operation and lower power consumption by 20% to 30%.

[0030] The pressure interlock protection of each pressure vessel of the present invention extends the life of the compressor by more than 30% when operating under the optimal working condition.

[0031] The present invention can realize automatic pressure monitoring and emergency shutdown, and reduce the risks of leakage and overpressure.

[0032] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic structural diagram of a hydrogen production and refueling integrated station in one embodiment of the present invention is shown.

[0034] Figure 2 The following is a flowchart showing the working logic of hydrogenation in an integrated hydrogen production and hydrogenation station according to one embodiment of the present invention. DETAILED DESCRIPTION

[0035] Example

[0036] like Figure 1 and Figure 2 As shown, a control method for a hydrogen production and hydrogenation integrated station is shown, wherein the hydrogen production and hydrogenation integrated 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 hydrogenation device connected in sequence, and hydrogen is added to a receiving device that needs to be filled with hydrogen through the hydrogenation device;

[0037] At the beginning of hydrogenation, 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 fills the receiving equipment;

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

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

[0042] Step B1, adjusting the pressure PT3 of the receiving equipment to be consistent with the maximum pressure P0 allowed for filling of the receiving equipment, and filling the receiving equipment with hydrogen;

[0043] Step B2: After hydrogen filling is completed, the hydrogenation equipment is closed;

[0044] Step C, checking whether the pressure PT1 of the first-level 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 intake pressure P9 of the secondary compressor, the secondary compressor is turned off;

[0048] Step E: Check whether the maximum pressure P0 allowed for filling of the receiving equipment is greater than or equal to a fourth preset pressure P4;

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

[0050] 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;

[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: Start 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, shut down the hydrogen production equipment.

[0053] The present invention adopts two-stage hydrogen storage tank dynamic pressure management to perform graded pressure replenishment on the equipment. It has intelligent equipment start and stop logic, a condition-triggered control mechanism, and closed-loop feedback on conditions, which can achieve 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 for filling by the receiving equipment; the first preset pressure P1 is more than 1 MPa greater than the maximum pressure P0 allowed for filling by the receiving equipment; 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 first-stage compressor.

[0055] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A method for controlling a hydrogen production and hydrogenation integrated 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 hydrogen is refueled to the receiving equipment that needs to be refueled through the hydrogen refueling device; At the beginning of hydrogenation, 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 fills the receiving equipment; Step A2: monitoring the pressure PT2 of the secondary hydrogen storage tank and the pressure PT3 of the injection receiving device, and comparing whether PT2 is greater than or equal to a first preset pressure P1; If PT2≤P1, go to step C, otherwise go to steps B1 and B2; Step B1, adjusting the pressure PT3 of the receiving equipment to be consistent with the maximum pressure P0 allowed for filling of the receiving equipment, and filling the receiving equipment with hydrogen; Step B2: After hydrogen filling is completed, the hydrogenation equipment is closed; Step C, checking whether the pressure PT1 of the first-level 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, starting the secondary compressor and monitoring 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 intake pressure P9 of the secondary compressor, shut down the secondary compressor; Step E: Check whether the maximum pressure P0 allowed for filling of the receiving device is greater than or equal to a fourth preset pressure P4; If PT0 ≥ P4, then execute steps F1 and F2; otherwise, execute step G; Step F1, starting the first-stage compressor and monitoring 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: Start 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, shut down the hydrogen production equipment.

2. The method for controlling a hydrogen production and hydrogenation integrated station according to claim 1, characterized in that: The third preset pressure P7 is more than 3 MPa higher than the maximum pressure P0 allowed for filling by the receiving equipment; the first preset pressure P1 is more than 1 MPa higher than the maximum pressure P0 allowed for filling by the receiving equipment; the second preset pressure P2 is more than 5 MPa higher than the minimum intake pressure of the secondary compressor; the fourth preset pressure P4 is more than 1 MPa higher than the minimum intake pressure of the primary compressor.

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