Method for adjusting the filling sequence of hydrogen storage cylinders at hydrogen refueling stations according to fatigue strength

Abstract

The present invention discloses a method for adjusting the filling order of hydrogen storage bottle groups at a hydrogen refueling station according to fatigue strength, which is as follows: through pressure gauge feedback, the pressure increase of each hydrogen storage bottle group after inflation is calculated, and based on the pressure increase, the fatigue effect of each inflation on the corresponding hydrogen storage bottle group is judged, and the fatigue effect of different levels is counted at the same time; when inflation is required, the counts of fatigue effects of different levels of each hydrogen storage bottle group are converted to obtain a comprehensive fatigue effect number of each hydrogen storage bottle group; then, according to the corresponding comprehensive fatigue effect number, corresponding maximum allowable inflation pressures are allocated to all hydrogen storage bottle groups, and the hydrogen storage bottle group with a larger corresponding comprehensive fatigue effect number has a smaller maximum allowable inflation pressure; finally, all hydrogen storage bottle groups are inflated in sequence according to the maximum allowable inflation pressures. The present invention constructs a dynamic load balancing mechanism to control the use frequency and fatigue strength deviation of each hydrogen storage bottle group within a reasonable range, thereby extending the service life of the hydrogen storage bottle group.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen filling station charging, and in particular to a method for adjusting the filling sequence of hydrogen storage bottle groups at a hydrogen filling station according to fatigue strength. Background Art

[0002] The existing hydrogen storage bottle group at hydrogen refueling stations usually consists of high-pressure hydrogen storage bottle group, medium-pressure hydrogen storage bottle group, and low-pressure hydrogen storage bottle group. In a hydrogen refueling station, the specifications and models of hydrogen storage bottles are exactly the same. The following problems are commonly encountered during the use of hydrogen storage bottle groups:

[0003] 1. Safety monitoring defects: The current system relies on passive detection of combustible gas leak detectors and manual inspections, but it cannot promptly identify safety hazards such as micro-damage and micro-leakage of hydrogen storage cylinders;

[0004] 2. Load balancing defect: The hydrogen storage bottle group adopts a fixed sequence filling strategy (low pressure → medium pressure → high pressure), which causes the usage frequency of each bottle group to decay in sequence, resulting in differences in fatigue life and reducing the overall service life of the system.

[0005] Therefore, how to solve the problem of safety and service life of hydrogen storage cylinder groups has become a technical problem that technical personnel in this field urgently need to solve. Summary of the Invention

[0006] In view of the above-mentioned defects of the prior art, the present invention provides a method for adjusting the filling order of hydrogen storage bottle groups in a hydrogen refueling station according to fatigue strength. The purpose of this method is to construct a dynamic load balancing mechanism so that the usage frequency and fatigue strength deviation of each hydrogen storage bottle group can be controlled within a reasonable range, thereby extending the service life of the hydrogen storage bottle group.

[0007] To achieve the above objectives, the present invention discloses a method for adjusting the filling sequence of hydrogen storage cylinder groups at a hydrogen refueling station according to fatigue strength, which is specifically as follows:

[0008] By providing feedback from a pressure gauge on each hydrogen storage bottle group, the pressure increase after each hydrogen storage bottle group is calculated, and based on the pressure increase, the fatigue effect of each inflation on the corresponding hydrogen storage bottle group is determined, and the fatigue effects of different levels are counted;

[0009] When inflation is required, follow these steps:

[0010] Step 1: converting the fatigue impact counts of different levels of each hydrogen storage bottle group to obtain a comprehensive fatigue impact number of each hydrogen storage bottle group;

[0011] Step 2: allocating corresponding maximum allowable inflation pressures to all hydrogen storage cylinder groups according to the corresponding comprehensive fatigue impact numbers, wherein the hydrogen storage cylinder group with a larger comprehensive fatigue impact number has a smaller maximum allowable inflation pressure;

[0012] Step 3: Inflate in sequence according to the maximum allowable inflation pressure of all the hydrogen storage cylinder groups.

[0013] Preferably, the steps of determining the fatigue effect of each inflation on the corresponding hydrogen storage cylinder group based on the pressure increase and counting the fatigue effects at different levels are as follows:

[0014] Step 0.1, real-time monitoring and reading the pressure gauge of each hydrogen storage bottle group;

[0015] Step 0.2: Determine whether the gas storage valve for charging and discharging of each hydrogen storage cylinder group is open;

[0016] If the gas storage valve of any of the hydrogen storage cylinder groups is open, the reading of the corresponding pressure gauge is recorded as the pre-inflation pressure of the corresponding hydrogen storage cylinder group;

[0017] If none of the gas storage valves is open, repeat step 1;

[0018] Step 0.3, determining whether all opened gas storage valves are closed;

[0019] When any of the opened gas storage valves is closed, the reading of the corresponding pressure gauge is recorded as the post-inflation pressure of the corresponding hydrogen storage bottle group;

[0020] If none of the opened gas storage valves are closed, repeat step 3;

[0021] Step 0.4: Subtract the post-inflation pressure of all hydrogen storage cylinder groups from the corresponding pre-inflation pressure, and perform different steps according to the size of the difference, as follows:

[0022] When the difference between any of the post-inflation pressures and the corresponding pre-inflation pressures is less than 5 MPa, return to step 0.1 and start again;

[0023] When the difference between any of the post-inflation pressures and the corresponding pre-inflation pressure is greater than or equal to 5 MPa but less than 25 MPa, the count of the shallow-level fatigue effect of the corresponding hydrogen storage cylinder group is increased by 1, and the process returns to step 0.1 and starts again;

[0024] When the difference between any of the post-inflation pressures and the corresponding pre-inflation pressure is greater than or equal to 25 MPa, the count of the deep-level fatigue effect of the corresponding hydrogen storage bottle group is increased by 1, and the process returns to step 0.1 and starts again.

[0025] Preferably, the comprehensive fatigue impact number of each hydrogen storage bottle group = the count of the fatigue impact of the corresponding shallow level / 3 + the count of the fatigue impact of the corresponding deep level.

[0026] Preferably, when the count of the fatigue effect of the shallow level of any hydrogen storage bottle group is greater than 6000, or the count of the fatigue effect of the deep level is greater than 2000, it is checked whether the corresponding hydrogen storage bottle group needs to be replaced.

[0027] Beneficial effects of the present invention:

[0028] The present invention constructs a dynamic load balancing mechanism to control the usage frequency and fatigue strength deviation of each hydrogen storage bottle group within a reasonable range, thereby extending the service life of the hydrogen storage bottle group.

[0029] 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

[0030] Figure 1 A flowchart illustrating the execution of a hydrogen refueling station including three groups of hydrogen storage bottles according to an embodiment of the present invention is shown.

[0031] Figure 2 FIG. 1 is a schematic diagram showing the connection structure of a hydrogen refueling station including three groups of storage cylinders in one embodiment of the present invention.

[0032] Figure 3 A flow chart is shown for determining the fatigue effect of a hydrogen storage bottle group during each inflation and counting fatigue effects of different levels in one embodiment of the present invention. DETAILED DESCRIPTION

[0033] Example 1: Figure 1 and Figure 2 As shown in FIG, the method for adjusting the filling sequence of hydrogen storage cylinders at a hydrogen refueling station according to fatigue strength is as follows:

[0034] By setting up a pressure gauge feedback on each hydrogen storage cylinder group, the pressure increase of each hydrogen storage cylinder group after inflation is calculated, and based on the pressure increase, the fatigue effect of each inflation on the corresponding hydrogen storage cylinder group is judged, and the fatigue effect of different levels is counted at the same time;

[0035] When inflation is required, follow these steps:

[0036] Step 1: Calculate the fatigue impact counts of different levels of each hydrogen storage bottle group to obtain a comprehensive fatigue impact number of each hydrogen storage bottle group;

[0037] Step 2: Allocate corresponding maximum allowable inflation pressures to all hydrogen storage cylinder groups according to the corresponding comprehensive fatigue impact numbers. A hydrogen storage cylinder group with a larger comprehensive fatigue impact number has a smaller maximum allowable inflation pressure.

[0038] Step 3: Inflate all hydrogen storage cylinders in sequence according to their maximum allowable inflation pressure.

[0039] The present invention optimizes the filling path through a dynamic programming algorithm based on fatigue accumulation data, realizes balanced adaptive filling control of hydrogen storage bottle groups, and constructs a dynamic load balancing mechanism to control the usage frequency and fatigue strength deviation of each hydrogen storage bottle group within a reasonable range, thereby extending the service life of the hydrogen storage bottle group.

[0040] like Figure 3 As shown, in some embodiments, the steps of determining the fatigue effect of each inflation on the corresponding hydrogen storage cylinder group based on the pressure increase and counting the fatigue effects of different levels are as follows:

[0041] Step 0.1: Monitor and read the pressure gauge of each hydrogen storage bottle group in real time;

[0042] Step 0.2: Determine whether the gas storage valve for charging and discharging of each hydrogen storage cylinder group is open;

[0043] If the gas storage valve of any hydrogen storage cylinder group is open, the reading of the corresponding pressure gauge shall be recorded as the pre-filling pressure of the corresponding hydrogen storage cylinder group;

[0044] If no gas storage valve is open, repeat step 1;

[0045] Step 0.3, determine whether all opened gas storage valves are closed;

[0046] When any opened gas storage valve is closed, the reading of the corresponding pressure gauge is recorded as the post-inflation pressure of the corresponding hydrogen storage cylinder group;

[0047] If no gas storage valve is closed after opening, repeat step 3;

[0048] Step 0.4: Subtract the pressure of all hydrogen storage cylinders after filling from the corresponding pressure before filling, and perform different steps according to the size of the difference, as follows:

[0049] When the difference between any post-inflation pressure and the corresponding pre-inflation pressure is less than 5 MPa, return to step 0.1 and start again;

[0050] When the difference between any post-inflation pressure and the corresponding pre-inflation pressure is greater than or equal to 5 MPa, but less than 25 MPa, the count of the shallow fatigue effect of the corresponding hydrogen storage cylinder group is increased by 1, and the process returns to step 0.1 and starts again;

[0051] When the difference between any post-inflation pressure and the corresponding pre-inflation pressure is greater than or equal to 25 MPa, the count of the deep-level fatigue effect of the corresponding hydrogen storage bottle group is increased by 1, and the process returns to step 0.1 and starts again.

[0052] In certain embodiments, the comprehensive fatigue impact number of each hydrogen storage cylinder group=the count of corresponding shallow-level fatigue impacts / 3+the count of corresponding deep-level fatigue impacts.

[0053] In certain embodiments, when the count of the shallow fatigue effect of any hydrogen storage cylinder group is greater than 6000, or the count of the deep fatigue effect of any hydrogen storage cylinder group is greater than 2000, it is checked whether the corresponding hydrogen storage cylinder group needs to be replaced.

[0054] like Figures 1 to 3 As shown, for a hydrogen refueling station with three hydrogen storage bottle groups, first, according to steps 0.1 to 0.4, the shallow fatigue effects Q11, Q21, and Q31, and the deep fatigue effects Q12, Q22, and Q32 of hydrogen storage bottle group 1, hydrogen storage bottle group 2, and hydrogen storage bottle group 3 are counted respectively;

[0055] Then calculate the comprehensive fatigue influence numbers of hydrogen storage bottle group 1, hydrogen storage bottle group 2 and hydrogen storage bottle group 3, namely Q11 / 3+Q12, Q21 / 3+ Q22 and Q31 / 3+ Q32;

[0056] Then, the corresponding maximum allowable inflation pressure is allocated according to the comprehensive fatigue influence number of hydrogen storage bottle group 1, hydrogen storage bottle group 2 and hydrogen storage bottle group 3. Figure 1 The middle ones are low-pressure bottle group, medium-pressure bottle group and high-pressure bottle group;

[0057] Finally, the hydrogen storage bottle group 1, the hydrogen storage bottle group 2 and the hydrogen storage bottle group 3 are inflated according to the maximum allowable inflation pressure assigned.

[0058] In actual applications, during the use of the hydrogen storage bottle group, it is filled once every cycle, and the fatigue effect is divided into shallow level and deep level according to the size of the pressure change.

[0059] Example 2: For example, for a 45 MPa hydrogen storage bottle group from a certain manufacturer, if the pressure difference in one filling cycle is 5 MPa x<P≤25MPa, a shallow fatigue impact is recorded; if the pressure difference in one filling cycle is 25 MPa x<P≤45MPa, a deep fatigue impact is recorded; within the life cycle of the hydrogen storage bottle group, 6,000 shallow fatigue impact cycles and 2,000 deep fatigue impact cycles are allowed. The degree of damage to the hydrogen storage bottle group caused by three shallow fatigue impacts is consistent with that caused by one deep fatigue impact.

[0060] Combined with the above data, the present invention can record and monitor the historical filling data of each hydrogen storage bottle group through a computer, determine the fatigue impact degree of the hydrogen storage bottle group (the number of shallow and deep fatigue impacts), and when the compressor starts, the computer first gives priority to hydrogen storage bottle groups with low fatigue impact for high-pressure filling based on the fatigue impact degree (the number of shallow and deep fatigue impacts).

[0061] 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 adjusting the filling sequence of hydrogen storage cylinders at a hydrogen refueling station according to fatigue strength; characterized in that: The details are as follows: By providing feedback from a pressure gauge on each hydrogen storage bottle group, the pressure increase after each hydrogen storage bottle group is calculated, and based on the pressure increase, the fatigue effect of each inflation on the corresponding hydrogen storage bottle group is determined, and the fatigue effects of different levels are counted; When inflation is required, follow these steps: Step 1: converting the fatigue impact counts of different levels of each hydrogen storage bottle group to obtain a comprehensive fatigue impact number of each hydrogen storage bottle group; Step 2: allocating corresponding maximum allowable inflation pressures to all hydrogen storage cylinder groups according to the corresponding comprehensive fatigue impact numbers, wherein the hydrogen storage cylinder group with a larger comprehensive fatigue impact number has a smaller maximum allowable inflation pressure; Step 3, filling the hydrogen storage cylinders in sequence according to the maximum allowable filling pressure of all the hydrogen storage cylinders; The steps of determining the fatigue effect of each inflation on the corresponding hydrogen storage cylinder group based on the pressure increase and counting the fatigue effects at different levels are as follows: Step 0.1, real-time monitoring and reading the pressure gauge of each hydrogen storage bottle group; Step 0.2: Determine whether the gas storage valve for charging and discharging of each hydrogen storage cylinder group is open; If the gas storage valve of any of the hydrogen storage cylinder groups is open, the reading of the corresponding pressure gauge is recorded as the pre-inflation pressure of the corresponding hydrogen storage cylinder group; If none of the gas storage valves is open, repeat step 1; Step 0.3, determining whether all opened gas storage valves are closed; When any of the opened gas storage valves is closed, the reading of the corresponding pressure gauge is recorded as the post-inflation pressure of the corresponding hydrogen storage bottle group; If none of the opened gas storage valves are closed, repeat step 3; Step 0.4: Subtract the post-inflation pressure of all hydrogen storage cylinder groups from the corresponding pre-inflation pressure, and perform different steps according to the size of the difference, as follows: When the difference between any of the post-inflation pressures and the corresponding pre-inflation pressures is less than 5 MPa, return to step 0.1 and start again; When the difference between any of the post-inflation pressures and the corresponding pre-inflation pressure is greater than or equal to 5 MPa but less than 25 MPa, the count of the shallow-level fatigue effect of the corresponding hydrogen storage cylinder group is increased by 1, and the process returns to step 0.1 and starts again; When the difference between any of the post-inflation pressures and the corresponding pre-inflation pressure is greater than or equal to 25 MPa, the fatigue impact count of the corresponding deep level of the hydrogen storage cylinder group is increased by 1, and the process returns to step 0.1 and starts again; The comprehensive fatigue impact number of each hydrogen storage bottle group = the count of the fatigue impact of the corresponding shallow level / 3 + the count of the fatigue impact of the corresponding deep level.

2. The method for adjusting the filling order of hydrogen storage cylinder groups at a hydrogen refueling station according to fatigue strength according to claim 1 is characterized in that: When the count of the fatigue effect of the shallow level of any hydrogen storage bottle group is greater than 6000, or the count of the fatigue effect of the deep level is greater than 2000, check whether the corresponding hydrogen storage bottle group needs to be replaced.

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