A method, system and flow meter for correcting liquid hydrogen refueling volume

Abstract

This invention provides a method, system, and flow meter for correcting liquid hydrogen refueling volume, belonging to the field of liquid hydrogen refueling technology. The method for correcting liquid hydrogen refueling volume includes the following steps: calibrating the refueling flow meter during high-flow refueling; after the refueling flow meter is accurately calibrated, calculating the refueling coefficient according to the different proportions of low-flow refueling time to the total refueling time; obtaining an estimated actual refueling volume that closely matches the actual data; through the liquid hydrogen refueling volume correction method of this invention, an estimated actual refueling volume that closely matches the actual data is obtained, and the total amount of refueling can also be accurately converted into monetary value, solving a crucial link in the storage and transportation refueling process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid hydrogen filling, and in particular to a liquid hydrogen filling quantity correction method, a correction system and a flowmeter. BACKGROUND

[0002] Liquid hydrogen storage and transportation represents an advanced storage and transportation direction and has broad application prospects in the fields of new energy vehicles, aerospace and the like. In the hydrogen energy industry chain, storage and transportation and filling are the main bottlenecks restricting the large-scale development. According to the analysis of the present situation and technical route research of foreign industry, liquid hydrogen storage and transportation will be an indispensable and effective technical route for the large-scale development of the hydrogen energy industry.

[0003] In the liquid hydrogen filling process, small flow filling and large flow filling are involved. However, the reading of the filling flowmeter is only matched with the true flow in the large flow filling process. In the small flow filling process, the reading of the filling flowmeter is not matched with the true flow. Therefore, the filling flow cannot be accurately measured in the whole filling process, and the total filling amount cannot be accurately converted. SUMMARY

[0004] Therefore, the technical problem to be solved by the present application is to overcome the defects that the filling flow cannot be accurately measured and the total filling amount cannot be accurately converted in the prior art, so as to provide a liquid hydrogen filling quantity correction method, a correction system and a flowmeter.

[0005] To solve the above technical problems, the present application provides a liquid hydrogen filling quantity correction method, and the correction system used comprises:

[0006] A liquid hydrogen storage tank, an output end of which is communicated with a target container through a filling pipeline, and a filling flowmeter is communicated on the filling pipeline;

[0007] A target container, which is placed on a weighing device, and an output end of the target container is communicated with a gas return pipeline, and a gas return flowmeter is communicated on the gas return pipeline;

[0008] The liquid hydrogen filling quantity correction method comprises the following steps:

[0009] In the large flow filling process, the filling flowmeter is corrected;

[0010] After the filling flowmeter is corrected accurately, the filling coefficient is calculated according to the different proportions of the small flow filling time to the total filling time;

[0011] The estimated actual filling quantity close to the true data is obtained.

[0012] As a preferred scheme, the correction process of the filling flowmeter is as follows:

[0013] The large flow filling time is t1, and in this process, the indication of the filling flowmeter is Q1, and the indication of the return flowmeter is q1;

[0014] In the large flow filling time t1, the mass difference of the weighing device is Δm1,

[0015] Determine whether (Q1- q1) x t1 is equal to Δm1. If yes, the filling flowmeter correction is completed.

[0016] If no, correct the filling flowmeter until (Q1- q1) x t1 is equal to Δm1, and the filling flowmeter correction is completed.

[0017] As a preferred solution, the process of calculating the filling coefficient is as follows:

[0018] The total filling time is T, the small flow filling time is t21, and the large flow filling time is t22,

[0019] When t21 / T≥30%, the small flow filling time is t21, and the large flow filling time is t22,

[0020] In the small flow filling process, the indication of the filling flowmeter is Q21, and the indication of the return flowmeter is q21,

[0021] In the large flow filling process, the indication of the filling flowmeter is Q22, and the indication of the return flowmeter is q22,

[0022] In the small flow filling time t21, the mass difference displayed by the weighing device is Δm21,

[0023] The filling coefficient k2 in the small flow filling process is {(Q21- q21) x t21)} / Δm21;

[0024] When t21 / T<30%, the small flow filling time is t21, and the large flow filling time is t22,

[0025] In the large flow filling process, the indication of the filling flowmeter is Q3, and the indication of the return flowmeter is q3,

[0026] In the total filling time T, the mass difference of the weighing device is Δm3,

[0027] The total filling coefficient k3 is {(Q3- q3) x T)} / Δm3.

[0028] As a preferred solution, the process of calculating the estimated actual filling amount is as follows:

[0029] When t21 / T≥30%, the small flow filling time is t21, and the large flow filling time is t22,

[0030] The estimated actual filling amount M1 is {(Q21- q21) x t21)} / k2+ (Q22- q22) x t22;

[0031] When t21 / T < 30%, t21 is the time interval of the first time interval, T is the time interval of the second time interval, and t21 is the time interval of the third time interval.

[0032] The estimated actual filling amount M2 = {(Q3-q3)×T} / k3.

[0033] As a preferred solution, the following steps are further included before liquid hydrogen filling:

[0034] Calibrate the weighing device, place the calibrated weighing device horizontally on the ground, and preheat for a specified time;

[0035] Place the target container on the weighing device and zero the reading of the weighing device.

[0036] The present application also provides a liquid hydrogen filling amount correction system, comprising:

[0037] A liquid hydrogen storage tank, the output end is communicated with the input end of the target container through the filling pipeline, and the filling pipeline is sequentially provided with a regulating valve assembly, a filling flowmeter and a hydrogen filling gun;

[0038] A target container placed on the weighing device, the output end of the target container is communicated with the gas return pipeline, and the gas return pipeline is sequentially provided with a gas return gun and a gas return flowmeter.

[0039] As a preferred solution, a first temperature sensor assembly is provided on the filling pipeline, a second temperature sensor assembly is provided on the gas return pipeline, and a third temperature sensor assembly and a liquid level sensor are provided on the target container.

[0040] As a preferred solution, it further comprises:

[0041] A controller connected to the regulating valve assembly and the hydrogen filling gun.

[0042] As a preferred solution, it further comprises:

[0043] A calculation and warning device connected to the first temperature sensor assembly, the second temperature sensor assembly, the third temperature sensor assembly, the filling flowmeter, the gas return flowmeter and the weighing device; the calculation and warning device is connected to the controller.

[0044] The present application also provides a filling flowmeter obtained by the liquid hydrogen filling amount correction method according to any one of the above.

[0045] The technical scheme of the present application has the following advantages:

[0046] 1.The present application provides a kind of liquid hydrogen filling quantity correction method, in the case where guaranteeing the accuracy of weighing equipment and back gas flowmeter, first, the filling flowmeter is corrected, to ensure the accuracy of filling flowmeter, ensure the accuracy of subsequent filling coefficient obtained;At the same time, according to the proportion of small flow filling time in total filling time, respectively calculate filling coefficient, so that the estimated actual filling quantity is more close to the real data.Summarized above, by the above calculation method, the estimated actual filling quantity close to the real data is obtained, and the total amount of filling amount can also be accurately converted, which solves an important link in the process of storage and transportation filling.

[0047] 2.The present application provides a kind of liquid hydrogen filling quantity correction method, in the correction process, the quality difference of weighing equipment is used to assist the completion of correction, and the weighing equipment is easy to obtain, and the technology is mature, and the data is accurate and reliable. BRIEF DESCRIPTION OF DRAWINGS

[0048] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the description of specific embodiments or prior art. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0049] Figure 1 The structure diagram of the liquid hydrogen filling quantity correction system of the present application.

[0050] Explanation of reference signs:

[0051] 1, liquid hydrogen storage tank;2, filling pipeline;3, regulating valve assembly;4, filling flowmeter;5, hydrogen filling gun;6, target container;7, weighing equipment;8, back gas pipeline;9, back gas gun;11, first temperature sensor assembly;12, second temperature sensor assembly;13, third temperature sensor assembly;14, liquid level sensor;15, controller;16, calculation and early warning device;17, back gas flowmeter. DETAILED DESCRIPTION

[0052] The technical solutions of the present application will be described in detail below with reference to the drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0053] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0054] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0055] In addition, the technical features involved in the different embodiments of the application described below can be combined with each other as long as they do not conflict with each other. Embodiment 1

[0056] The present embodiment provides a correction method for liquid hydrogen filling quantity, and the correction system used comprises a liquid hydrogen storage tank 1 and a target container 6. The output end of the liquid hydrogen storage tank 1 is communicated with the target container 6 through a filling pipeline 2, and a filling flowmeter 4 is communicated on the filling pipeline 2. The target container 6 is placed on a weighing device 7, and the output end of the target container 6 is communicated with a gas return pipeline 8, and a gas return flowmeter 17 is communicated on the gas return pipeline 8.

[0057] Before actual correction, the liquid hydrogen storage tank 1 and the target container 6 are connected; the weighing device 7 is calibrated, the calibrated weighing device 7 is placed horizontally on the ground, and is powered and preheated to a specified time, which is preferably 30 minutes. Then, the target container 6 is placed on the weighing device 7, and the indication of the weighing device 7 is reset to zero.

[0058] Further, the correction method for liquid hydrogen filling quantity comprises the following steps:

[0059] 1. In the process of large flow filling, the filling flowmeter 4 is corrected;

[0060] In this step, the indications displayed in the weighing device 7 and the gas return flowmeter 17 have been corrected and are accurate. The filling flowmeter 4 and the gas return flowmeter 17 are both mass flowmeters.

[0061] The correction process of the filling flowmeter 4 is as follows:

[0062] The large-flow filling time is t1, and in this process, the reading of the filling flowmeter 4 is Q1, and the reading of the return gas flowmeter 17 is q1;

[0063] In the large-flow filling time t1, the mass difference of the weighing device 7 is Δm1,

[0064] It is determined whether (Q1- q1) x t1 is equal to Δm1, and if so, the correction of the filling flowmeter 4 is completed;

[0065] If not, the filling flowmeter 4 is corrected until (Q1- q1) x t1 is equal to Δm1, and the correction of the filling flowmeter 4 is completed.

[0066] 2. After the filling flowmeter 4 is corrected accurately, the filling coefficient is calculated according to the different proportions of the small-flow filling time to the total filling time.

[0067] The process of calculating the filling coefficient is as follows:

[0068] The total filling time is T, the small-flow filling time is t2, and the large-flow filling time is t22,

[0069] In the filling process, when the proportion of the small-flow filling time to the total filling time is large, the small-flow filling process greatly affects the deviation in the whole filling process, so after the filling coefficient in the small-flow filling process is obtained, the estimated actual filling amount in the small-flow is obtained, and then the total estimated actual filling amount is obtained by adding the filling amount in the large-flow.

[0070] Therefore, when t21 / T≥30%,

[0071] In the small-flow filling process, the reading of the filling flowmeter 4 is Q21, and the reading of the return gas flowmeter 17 is q21,

[0072] In the large-flow filling process, the reading of the filling flowmeter 4 is Q22, and the reading of the return gas flowmeter 17 is q22,

[0073] In the small-flow filling time t21, the mass difference displayed by the weighing device 7 is Δm21,

[0074] The filling coefficient k2 in the small-flow process is (Q21- q21) x t21) / Δm2;

[0075] The above process can obtain the estimated actual filling amount close to the real data, but the whole calculation process is relatively cumbersome. Therefore, when the small flow filling time length accounts for a small proportion of the total filling time length, the small flow filling process has little effect on the whole filling process, and the filling coefficient of the whole process can be obtained for direct calculation.

[0076] When t21 / T < 30%, Q21=Q3, q21=q3,

[0077] In the large flow filling process, the indication of the filling flowmeter 4 is Q3, and the indication of the back gas flowmeter 17 is q3,

[0078] In the whole process filling time T, the mass difference of the weighing device 7 is Δm3,

[0079] The whole process filling coefficient k3 = {(Q3- q3) × T} / Δm3.

[0080] 3. Obtain the estimated actual filling amount close to the real data.

[0081] The process of calculating the estimated actual filling amount is as follows:

[0082] When t21 / T ≥ 30%, Q21=Q3, q21=q3,

[0083] The estimated actual filling amount M1 = {(Q21- q21) × t21} / k2 + (Q22- q22) × t22;

[0084] When t21 / T < 30%, Q21=Q3, q21=q3,

[0085] The estimated actual filling amount M2 = {(Q3- q3) × T} / k3.

[0086] Through the above calculation process, the estimated actual filling amount close to the real data is obtained, and the amount of the total filling amount can also be accurately converted, solving an important link in the storage and transportation filling process. Example 2

[0087] The embodiment provides a liquid hydrogen filling amount correction system for the liquid hydrogen filling amount correction method described in embodiment 1, and the correction system comprises a liquid hydrogen storage tank 1 and a target container 6. The output end of the liquid hydrogen storage tank 1 is communicated with the input end of the target container 6 through a filling pipeline 2. The filling pipeline 2 is provided with an adjusting valve assembly 3, a filling flowmeter 4 and a filling gun 5 in sequence. The target container 6 is placed on a weighing device 7, and one end of a back gas pipeline 8 is communicated with the output end of the target container 6. A back gas gun 9 and a back gas flowmeter 17 are arranged on the back gas pipeline 8 in sequence.

[0088] Further, the first temperature sensor assembly 11 is arranged on the filling pipeline 2, the second temperature sensor assembly 12 is arranged on the return pipeline 8, and the third temperature sensor assembly 13 and the liquid level sensor 14 are arranged on the target container 6.

[0089] The adjusting valve assembly 3 and the hydrogenation gun 5 are connected with the controller 15, the first temperature sensor assembly 11, the second temperature sensor assembly 12, the third temperature sensor assembly 13, the filling flowmeter 4, the return flowmeter 17 and the weighing device 7 are connected with the calculation and warning device 16, and the calculation and warning device 16 is connected with the controller 15.

[0090] In use, the filling pipeline 2 and the target container 6 are pre-cooled, the hydrogenation gun 5 is opened by the controller 15, and the opening of the adjusting valve assembly 3 is controlled so that the liquid hydrogen flows out of the liquid hydrogen storage tank 1 gradually to pre-cool the filling pipeline 2 and the target container 6. The calculation and warning device 16 detects the readings of the first temperature sensor assembly 11, the second temperature sensor and the third temperature sensor assembly 13 to determine whether the pre-cooling is completed according to the readings. If the first temperature sensor assembly 11, the second temperature sensor assembly 12 and the third temperature sensor assembly 13 reach the preset temperatures respectively, the pre-cooling is completed.

[0091] After the pre-cooling is completed, the calculation and warning device 16 transmits a signal to the controller 15, the controller 15 controls the adjusting valve assembly 3 to change the opening to start the small-flow filling. During the small-flow filling, the calculation and warning device 16 monitors and records the readings of the filling flowmeter 4, the return flowmeter 17 and the weighing device 7 for use in the correction process.

[0092] Meanwhile, the calculation and warning device 16 monitors the change of the liquid level of the liquid hydrogen in the target container 6 in real time through the liquid level sensor 14. When the liquid level in the target container 6 reaches the preset liquid level, the calculation and warning device 16 transmits a signal to the controller 15, and the controller 15 controls the adjusting valve assembly 3 to change the opening to start the large-flow filling. During the large-flow filling, the calculation and warning device 16 monitors and records the readings of the filling flowmeter 4, the return flowmeter 17 and the weighing device 7 for use in the correction process. Embodiment 3

[0093] The embodiment provides a filling flowmeter 4 obtained by the correction method of the liquid hydrogen filling amount in the embodiment 1. Obviously, the above embodiment is only an example for clear illustration, and is not a limitation on the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. All the embodiments do not need to be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A method of correcting a liquid hydrogen fill quantity, characterized by, The correction system used comprises: a liquid hydrogen storage tank, the output end of which is communicated with the target container through a filling pipeline, and a filling flowmeter is communicated on the filling pipeline; the target container is placed on a weighing device, and the output end of the target container is communicated with a gas return pipeline, and a gas return flowmeter is communicated on the gas return pipeline; the correction method of the liquid hydrogen filling amount comprises the following steps: in the large flow filling process, the filling flowmeter is corrected; after the filling flowmeter is corrected accurately, the filling coefficient is calculated according to the different proportions of the small flow filling time in the total filling time; the filling coefficient calculation process is as follows: the total filling time is T, the small flow filling time is t21, and the large flow filling time is t22, when t21 / T≥30%, the filling flowmeter reading is Q21, the gas return flowmeter reading is q21, the filling flowmeter reading is Q22, and the gas return flowmeter reading is q22 in the large flow filling process, the mass difference displayed by the weighing device in the small flow filling time t21 is Δm21, the filling coefficient k2 in the small flow filling process is k2={(Q21-q21)×t21} / Δm21; when t21 / T<30%, the filling flowmeter reading is Q3, and the gas return flowmeter reading is q3 in the large flow filling process, the mass difference of the weighing device in the whole process filling time T is Δm3, the whole process filling coefficient k3 is k3={(Q3-q3)×T} / Δm3; the estimated actual filling amount close to the true data is obtained. the filling flowmeter correction process is as follows: the large flow filling time is t1, the filling flowmeter reading is Q1, and the gas return flowmeter reading is q1 in the process; 2. The method of claim 1, wherein, the mass difference Δm1 of the weighing device in the large flow filling time t1 is Δm1, it is judged whether (Q1-q1)×t1 is equal to Δm1, if yes, the filling flowmeter correction is completed; if not, the filling flowmeter is corrected until (Q1-q1)×t1 is equal to Δm1, and the filling flowmeter correction is completed. the process of calculating the estimated actual filling amount is as follows: when t21 / T≥30%, the estimated actual filling amount M1 is M1={(Q21-q21)×t21} / k2+(Q22-q22)×t22; 3. The method of claim 1, wherein, when t21 / T<30%, the estimated actual filling amount M2 is M2={(Q3-q3)×T} / k3. the following steps are further included before the liquid hydrogen filling: the weighing device is calibrated, the calibrated weighing device is placed horizontally on the ground, and is powered and preheated to a specified time; the target container is placed on the weighing device, and the reading of the weighing device is reset to zero. In the correction method of the liquid hydrogen filling amount of any one of claims 1-4, the correction system of the liquid hydrogen filling amount comprises:

4. The method of claim 1, wherein, a liquid hydrogen storage tank, the output end of which is communicated with the input end of the target container through a filling pipeline, and a filling flowmeter and a hydrogen filling gun are sequentially arranged on the filling pipeline; the target container is placed on a weighing device, and the output end of the target container is communicated with a gas return pipeline, and a gas return gun and a gas return flowmeter are sequentially arranged on the gas return pipeline. ​ 5. A liquid hydrogen fill quantity correction system, characterized by, ​ ​ ​ 6. The liquid hydrogen fill quantity correction system according to claim 5, wherein The first temperature sensor assembly is arranged on the filling pipeline, the second temperature sensor assembly is arranged on the return pipeline, and the third temperature sensor assembly and the liquid level sensor are arranged on the target container.

7. The liquid hydrogen fill rate correction system of claim 6, wherein, Further comprising: A controller connected with the regulating valve assembly and the hydrogen filling gun.

8. The liquid hydrogen fill quantity correction system of claim 7, wherein, Further comprising: A calculation and warning device connected with the first temperature sensor assembly, the second temperature sensor assembly, the third temperature sensor assembly, the filling flowmeter, the return flowmeter and the weighing device; and the calculation and warning device is connected with the controller.

Images