Method and system for correcting safe kick-off pressure of liquefied gas tank container

Abstract

The application discloses a liquefied gas tank safety jump pressure correction method and system, which comprises the following steps: obtaining the tank inflation pressure, the initial safety jump pressure, the critical temperature and the critical pressure of the liquefied gas tank, and the ambient temperature and the relative humidity of the environment where the liquefied gas tank is located; setting the attention weight function of the tank inflation pressure, the ambient temperature and the relative humidity of the environment where the liquefied gas tank is located, and the correction term function; setting the safety jump pressure correction model according to the initial safety jump pressure, combining the attention weight function and the correction term function, calculating the corrected safety jump pressure, and completing the safety jump pressure correction.

Description

Technical Field

[0001] This invention belongs to the field of liquefied gas tank safety start-up pressure correction technology, and more specifically, relates to a method and system for correcting the safety start-up pressure of liquefied gas tanks. Background Technology

[0002] The safe trip pressure of a liquefied gas (LNG) tank or container refers to the lowest permissible pressure threshold in an LNG storage tank or container. When the pressure falls below this threshold, the LNG cannot be supplied or used normally. LNG storage tanks or containers are typically designed as a closed system for storing and transporting liquefied gases, such as liquefied petroleum gas (LPG) and liquefied natural gas (LNG).

[0003] Liquefied gases exist in liquid form within storage tanks. Due to their volatile nature, they generate a certain vapor pressure. The safe break-in pressure refers to the threshold at which the vapor pressure inside the tank exceeds a certain level, indicating that the liquefied gas is ready for supply or use. Typically, the break-in pressure of liquefied gas tanks is determined by designers based on the properties of the liquefied gas, process requirements, and safety standards.

[0004] The safety start-up pressure is set to ensure a stable supply and reasonable operating pressure of liquefied gas in the storage tank during normal operation. At the same time, the start-up pressure also prevents the tank from expanding to too low a pressure, which could lead to insufficient evaporation of the liquefied gas or failure to deliver it normally.

[0005] The specific safe trip pressure depends on the characteristics of the liquefied gas, application requirements, and relevant standards and specifications. Different types of liquefied gases and application scenarios may have different safe trip pressure requirements. Therefore, when designing and using liquefied gas storage tanks, relevant safety standards and regulations must be followed to ensure the reasonable setting and operation of the safe trip pressure.

[0006] In existing technologies, the correction for the safe start-up pressure of liquefied gas tanks is not accurate, resulting in an insignificant correction effect. Summary of the Invention

[0007] To address the above technical problems, this invention proposes a method for correcting the safe tripping pressure of liquefied gas tank containers, comprising:

[0008] The expansion pressure, initial safe starting pressure, critical temperature and critical pressure of the liquefied gas tank are obtained, as well as the ambient temperature and relative humidity of the environment in which the liquefied gas tank is located.

[0009] The attention weight function and correction term function are set for the expansion pressure, the ambient temperature of the environment where the liquefied gas tank is located, and the relative humidity of the environment where the liquefied gas tank is located;

[0010] Based on the initial safe starting pressure, and in conjunction with the attention weight function and the correction term function, a safe starting pressure correction model is set. When the liquefied gas tank reaches a filling rate of 98%, the corrected safe starting pressure is calculated, and the corrected safe starting pressure is used as the new safe starting pressure to complete the safe starting pressure correction.

[0011] Furthermore, the safe take-off pressure correction model is as follows:

[0012] P corrected =P initial +α*A(T,P,RH)*W(T,P,RH)

[0013] Among them, P corrected For the corrected safe take-off pressure, P initial Let α be the initial safe starting pressure, T be the ambient temperature, P be the tank expansion pressure, RH be the ambient relative humidity, A(T, P, RH) be the attention weighting function, and W(T, P, RH) be the correction term function.

[0014] Furthermore, the attention weight function A(T, P, RH) and the correction term function W(T, P, RH) are respectively:

[0015] A(T,P,RH)=β1*f1(T)+β2*f2(P)+β3*f3(RH)

[0016] W(R,P,RH)=γ1*g1(T,P)+γ2*g2(R,H)

[0017] Wherein, β1, β2 and β3 are attention weight coefficients, f1(T) is the characteristic function of ambient temperature, f2(P) is the characteristic function of tank expansion pressure, f3(RH) is the characteristic function of ambient relative humidity, γ1 and γ2 are correction term coefficients, g1(T,P) is the correction term function of ambient temperature and tank expansion pressure, and g2(RH) is the correction term function of ambient relative humidity.

[0018] Furthermore, the characteristic functions f1(T) for ambient temperature, f2(P) for tank expansion pressure, and f3(RH) for ambient relative humidity are as follows:

[0019]

[0020]

[0021] f3(RH)=k3RH+δ

[0022] Where k1 is the adjustment coefficient of the characteristic function of ambient temperature, k2 is the adjustment coefficient of the characteristic function of tank expansion pressure, n is the adjustment coefficient of tank expansion pressure, and k3 and δ are the characteristic functions of ambient relative humidity.

[0023] Furthermore, the correction functions for ambient temperature g1(T, P), tank expansion pressure, and ambient relative humidity g2(RH) are respectively:

[0024] g1(T, P) = k4(TT) c )+k5(PP c )

[0025]

[0026] Where k4 and k5 are the adjustment coefficients of the correction term function for ambient temperature and tank expansion pressure, T c P is the critical temperature of the liquefied gas tank container. c K is the critical pressure of the liquefied gas tank, and k6 is the adjustment coefficient of the correction term function for the ambient relative humidity.

[0027] This invention also proposes a liquefied gas tank safety trip pressure correction system, comprising:

[0028] The data acquisition module is used to acquire the expansion pressure, initial safe opening pressure, critical temperature and critical pressure of the liquefied gas tank, as well as the ambient temperature and relative humidity of the environment in which the liquefied gas tank is located.

[0029] The function module is configured to set the attention weight function and correction term function for the expansion pressure, the ambient temperature of the liquefied gas tank, and the relative humidity of the environment where the liquefied gas tank is located;

[0030] The correction module is used to set a safety start-up pressure correction model based on the initial safety start-up pressure and in combination with the attention weight function and the correction term function. When the liquefied gas tank reaches a filling rate of 98%, the corrected safety start-up pressure is calculated and used as the new safety start-up pressure to complete the safety start-up pressure correction.

[0031] Furthermore, the safe take-off pressure correction model is as follows:

[0032] P corrected =P initial +α*(T,P,RH)*W(T,P,RH)

[0033] Among them, P corrected For the corrected safe take-off pressure, P initial Let α be the initial safe starting pressure, T be the ambient temperature, P be the tank expansion pressure, RH be the ambient relative humidity, A(T, P, RH) be the attention weighting function, and W(T, P, RH) be the correction term function.

[0034] Furthermore, the attention weight function A(T, P, RH) and the correction term function W(T, P, RH) are respectively:

[0035] A(T,P,RH)=β1*f1(T)+β2*f2(P)+β3*f3(RH)

[0036] W(T,P,RH)=γ1*g1(T,P)+γ2*g2(RH)

[0037] Wherein, β1, β2 and β3 are attention weight coefficients, f1(T) is the characteristic function of ambient temperature, f2(P) is the characteristic function of tank expansion pressure, f3(RH) is the characteristic function of ambient relative humidity, γ1 and γ2 are correction term coefficients, g1(T,P) is the correction term function of ambient temperature and tank expansion pressure, and g2(RH) is the correction term function of ambient relative humidity.

[0038] Furthermore, the characteristic functions f1(T) for ambient temperature, f2(P) for tank expansion pressure, and f3(RH) for ambient relative humidity are as follows:

[0039]

[0040]

[0041] f3(RH)=k3RH+δ

[0042] Where k1 is the adjustment coefficient of the characteristic function of ambient temperature, k2 is the adjustment coefficient of the characteristic function of tank expansion pressure, n is the adjustment coefficient of tank expansion pressure, and k3 and δ are the characteristic functions of ambient relative humidity.

[0043] Furthermore, the correction functions for ambient temperature g1(T, P), tank expansion pressure, and ambient relative humidity g2(RH) are respectively:

[0044] g1(T, P) = k4(TT) c )+k5(PP c )

[0045]

[0046] Where k4 and k5 are the adjustment coefficients of the correction term function for ambient temperature and tank expansion pressure, T c P is the critical temperature of the liquefied gas tank container. c K is the critical pressure of the liquefied gas tank, and k6 is the adjustment coefficient of the correction term function for the ambient relative humidity.

[0047] In summary, the technical solutions conceived by this invention have the following beneficial effects compared with the prior art:

[0048] This invention obtains the expansion pressure, initial safe trip pressure, critical temperature, and critical pressure of the liquefied gas tank, as well as the ambient temperature and relative humidity of the environment in which the liquefied gas tank is located. It then sets attention weight functions and correction functions for the expansion pressure, ambient temperature, and relative humidity of the liquefied gas tank. Based on the initial safe trip pressure, and in conjunction with the attention weight functions and correction functions, a safe trip pressure correction model is established to calculate the corrected safe trip pressure, thus completing the safe trip pressure correction. Through these technical features, this invention can promptly correct the safe trip pressure, thereby ensuring the safety of the liquefied gas tank. Attached Figure Description

[0049] Figure 1 This is a flowchart of the method of Embodiment 1 of the present invention;

[0050] Figure 2 This is a structural diagram of the system in Embodiment 2 of the present invention. Detailed Implementation

[0051] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0052] The method provided by this invention can be implemented in a terminal environment that may include one or more of the following components: a processor, a storage medium, and a display screen. The storage medium stores at least one instruction, which is loaded and executed by the processor to implement the method described in the following embodiments.

[0053] A processor may include one or more processing cores. The processor uses various interfaces and lines to connect various parts of the terminal, and performs various functions and processes data by running or executing instructions, programs, code sets or instruction sets stored in the storage medium, and by calling data stored in the storage medium.

[0054] Storage media can include random access memory (RAM) or read-only memory (ROM). Storage media can be used to store instructions, programs, code, code sets, or instructions.

[0055] The display screen is used to show the user interface of each application.

[0056] In addition, those skilled in the art will understand that the structure of the terminal described above does not constitute a limitation on the terminal. The terminal may include more or fewer components, or combine certain components, or have different component arrangements. For example, the terminal may also include radio frequency circuits, input units, sensors, audio circuits, power supplies, and other components, which will not be described in detail here.

[0057] In this invention, the subscripts in all formulas are used only to distinguish parameters and have no specific meaning.

[0058] Example 1

[0059] like Figure 1 As shown, this embodiment of the invention provides a method for correcting the safe tripping pressure of a liquefied gas tank, comprising:

[0060] Step 101: Obtain the expansion pressure of the liquefied gas tank, the initial safe starting pressure, the critical temperature of the liquefied gas tank, the critical pressure of the liquefied gas tank, the ambient temperature of the environment where the liquefied gas tank is located, and the ambient relative humidity of the environment where the liquefied gas tank is located.

[0061] Specifically, the steps for calculating the expansion pressure of the tank include:

[0062] The method for calculating the real-time total gas-liquid mass m0 of an LNG tank container is as follows:

[0063] m0=ρ li ×V×Φ+ρ gi ×V×(1-Φ) (1-1)

[0064] In a saturated homogeneous model, there is a fixed relationship between gas phase density, liquid phase density, and pressure. Polynomial interpolation simplifies the intermediate conversion process. Based on this method, the real-time gas phase density ρ is given by the formula. gi and real-time liquid phase density ρ li Calculate using the following formula:

[0065] ρ li =a z％ P i 6 +b z％ P i 5 +c z％P i 4 +d z％ P i 3 +e z％ P i 2 +f z％ P i +g z％ (1-2)

[0066] ρ gi =A z％ P i 6 +B z％ P i 5 +C z％ P i 4 +D z％ P i 3 +E z％ P i 2 +F z％ P i +G z％ (1-3)

[0067] Where: m0—total mass of gas and liquid in the tank, kg

[0068] ρ gi —Gas density inside the tank, kg / m³ 3

[0069] ρ li —Liquid density inside the tank, kg / m³ 3

[0070] V—Effective volume of the storage tank, in meters 3

[0071] Φ—Fill rate, %

[0072] P i —Inner pressure of the tank, MPa

[0073] a z％ b z％ c z％ d z％ e z％ f z％ g z％ —Polynomial coefficients for converting pressure to gas phase density for a specific LNG composition.

[0074] A z％ B z％ C z％ Dz％ E z％ F z％ G z％ —The polynomial coefficients for converting pressure to liquid density for a specific LNG composition.

[0075] Calculate the density ρ of the expanded tank z The calculation method is as follows:

[0076]

[0077] ρ z —Liquid phase density during tank expansion, kg / m³ 3 V—Effective volume of the storage tank, m 3 ;

[0078] The method for calculating the expansion pressure P of the tank is as follows:

[0079] P = k Z％ ρ z 3 +l z％ ρ z 2 +m z％ ρ z +n z％

[0080] In the formula: k z％ l z％ m z％ n z％ —For a specific LNG composition, the liquid phase density ρ z Polynomial coefficients converted to pressure; in the saturated homogeneous model, there is a fixed relationship between gas phase density, liquid phase density and pressure, and polynomial interpolation is used here to simplify the intermediate conversion process.

[0081] Step 102: Set the attention weight function and correction term function for the expansion pressure, the ambient temperature of the liquefied gas tank, and the relative humidity of the environment where the liquefied gas tank is located;

[0082] Specifically, the attention weight function A(T, P, RH) and the correction term function W(T, P, RH) are as follows:

[0083] A(T,P,RH)=β1*f1(T)+β2*f2(P)+β3*f3(RH)

[0084] W(T,P,RH)=γ1*g1(T,P)+γ2*g2(RH)

[0085] Wherein, β1, β2 and β3 are attention weight coefficients, f1(T) is the characteristic function of ambient temperature, f2(P) is the characteristic function of tank expansion pressure, f3(RH) is the characteristic function of ambient relative humidity, γ1 and γ2 are correction term coefficients, g1(T,P) is the correction term function of ambient temperature and tank expansion pressure, and g2(RH) is the correction term function of ambient relative humidity.

[0086] Specifically, the characteristic functions f1(T) for ambient temperature, f2(P) for tank expansion pressure, and f3(RH) for ambient relative humidity are as follows:

[0087]

[0088]

[0089] f3(RH)=k3RH+δ

[0090] Where k1 is the adjustment coefficient of the characteristic function of ambient temperature, k2 is the adjustment coefficient of the characteristic function of tank expansion pressure, n is the adjustment coefficient of tank expansion pressure, and k3 and δ are the characteristic functions of ambient relative humidity.

[0091] Specifically, the correction functions for ambient temperature g1(T, P), tank expansion pressure, and ambient relative humidity g2(RH) are as follows:

[0092] g1(T, P) = k4(TT) c )+k5(PP c )

[0093]

[0094] Where k4 and k5 are the adjustment coefficients of the correction term function for ambient temperature and tank expansion pressure, T c P is the critical temperature of the liquefied gas tank container. c K is the critical pressure of the liquefied gas tank, and k6 is the adjustment coefficient of the correction term function for the ambient relative humidity.

[0095] Step 103: Based on the initial safe start-up pressure, and in combination with the attention weight function and the correction term function, a safe start-up pressure correction model is set. When the liquefied gas tank reaches a filling rate of 98%, the corrected safe start-up pressure is calculated, and the corrected safe start-up pressure is used as the new safe start-up pressure to complete the safe start-up pressure correction.

[0096] Specifically, the safe take-off pressure correction model is as follows:

[0097] P corrected =P initial+α*A(T,P,RH)*W(T,P,RH)

[0098] Among them, P corrected For the corrected safe take-off pressure, P initial Let α be the initial safe starting pressure, T be the ambient temperature, P be the tank expansion pressure, RH be the ambient relative humidity, A(T, P, RH) be the attention weighting function, and W(T, P, RH) be the correction term function.

[0099] Example 2

[0100] like Figure 2 As shown, this embodiment of the invention also provides a liquefied gas tank safety trip pressure correction system, comprising:

[0101] The data acquisition module is used to acquire the expansion pressure, initial safe opening pressure, critical temperature and critical pressure of the liquefied gas tank, as well as the ambient temperature and relative humidity of the environment in which the liquefied gas tank is located.

[0102] The function module is configured to set the attention weight function and correction term function for the expansion pressure, the ambient temperature of the liquefied gas tank, and the relative humidity of the environment where the liquefied gas tank is located;

[0103] Specifically, the attention weight function A(T, P, RH) and the correction term function W(T, P, RH) are as follows:

[0104] A(T,P,RH)=β1*f1(T)+β2*f2(P)+β3*f3(RH)

[0105] W(T,P,RH)=γ1*g1(T,P)+γ2*g2(RH)

[0106] Wherein, β1, β2 and β3 are attention weight coefficients, f1(T) is the characteristic function of ambient temperature, f2(P) is the characteristic function of tank expansion pressure, f3(RH) is the characteristic function of ambient relative humidity, γ1 and γ2 are correction term coefficients, g1(T,P) is the correction term function of ambient temperature and tank expansion pressure, and g2(RH) is the correction term function of ambient relative humidity.

[0107] Specifically, the characteristic functions f1(T) for ambient temperature, f2(P) for tank expansion pressure, and f3(RH) for ambient relative humidity are as follows:

[0108]

[0109]

[0110] f3(RH)=k3RH+δ

[0111] Where k1 is the adjustment coefficient of the characteristic function of ambient temperature, k2 is the adjustment coefficient of the characteristic function of tank expansion pressure, n is the adjustment coefficient of tank expansion pressure, and k3 and δ are the characteristic functions of ambient relative humidity.

[0112] Specifically, the correction functions for ambient temperature g1(T, P), tank expansion pressure, and ambient relative humidity g2(RH) are as follows:

[0113] g1(T, P) = k4(TT) c )+k5(PP c )

[0114]

[0115] Where k4 and k5 are the adjustment coefficients of the correction term function for ambient temperature and tank expansion pressure, T c P is the critical temperature of the liquefied gas tank container. c K is the critical pressure of the liquefied gas tank, and k6 is the adjustment coefficient of the correction term function for the ambient relative humidity.

[0116] The correction module is used to set a safety start-up pressure correction model based on the initial safety start-up pressure and in combination with the attention weight function and the correction term function. When the liquefied gas tank reaches a filling rate of 98%, the corrected safety start-up pressure is calculated and used as the new safety start-up pressure to complete the safety start-up pressure correction.

[0117] Specifically, the safe take-off pressure correction model is as follows:

[0118] P corrected =P initial +α*A(T, P, RH)

[0119] Among them, P corrected For the corrected safe take-off pressure, P initial Let α be the initial safe starting pressure, T be the ambient temperature, P be the tank expansion pressure, RH be the ambient relative humidity, A(T, P, RH) be the attention weighting function, and W(T, P, RH) be the correction term function.

[0120] Example 3

[0121] This invention also proposes a storage medium storing multiple instructions for implementing the aforementioned method for correcting the safety start-up pressure of a liquefied gas tank.

[0122] Optionally, in this embodiment, the storage medium may be located in any computer terminal in a group of computer terminals in a computer network, or in any mobile terminal in a group of mobile terminals.

[0123] Optionally, in this embodiment, the storage medium is configured to store program code for performing the following steps: Step 101, obtaining the expansion pressure of the liquefied gas tank, the initial safe starting pressure, the critical temperature of the liquefied gas tank and the critical pressure of the liquefied gas tank, as well as the ambient temperature and relative humidity of the environment in which the liquefied gas tank is located.

[0124] Step 102: Set the attention weight function and correction term function for the expansion pressure, the ambient temperature of the liquefied gas tank, and the relative humidity of the environment where the liquefied gas tank is located;

[0125] Specifically, the attention weight function A(T, P, RH) and the correction term function W(T, P, RH) are as follows:

[0126] A(T,P,RH)=β1*f1(T)+β2*f2(P)+β3*f3(RH)

[0127] W(T,P,RH)=γ1*g1(T,P)+γ2*g2(RH)

[0128] Wherein, β1, β2 and β3 are attention weight coefficients, f1(T) is the characteristic function of ambient temperature, f2(P) is the characteristic function of tank expansion pressure, f3(RH) is the characteristic function of ambient relative humidity, γ1 and γ2 are correction term coefficients, g1(T,P) is the correction term function of ambient temperature and tank expansion pressure, and g2(RH) is the correction term function of ambient relative humidity.

[0129] Specifically, the characteristic functions f1(T) for ambient temperature, f2(P) for tank expansion pressure, and f3(RH) for ambient relative humidity are as follows:

[0130]

[0131]

[0132] f3(RH)=k3RH+δ

[0133] Where k1 is the adjustment coefficient of the characteristic function of ambient temperature, k2 is the adjustment coefficient of the characteristic function of tank expansion pressure, n is the adjustment coefficient of tank expansion pressure, and k3 and δ are the characteristic functions of ambient relative humidity.

[0134] Specifically, the correction functions for ambient temperature g1(T, P), tank expansion pressure, and ambient relative humidity g2(RH) are as follows:

[0135] g1(T, P) = k4(TT) c )+k5(PP c )

[0136]

[0137] Where k4 and k5 are the adjustment coefficients of the correction term function for ambient temperature and tank expansion pressure, T c P is the critical temperature of the liquefied gas tank container. c K is the critical pressure of the liquefied gas tank, and k6 is the adjustment coefficient of the correction term function for the ambient relative humidity.

[0138] Step 103: Based on the initial safe start-up pressure, and in combination with the attention weight function and the correction term function, a safe start-up pressure correction model is set. When the liquefied gas tank reaches a filling rate of 98%, the corrected safe start-up pressure is calculated, and the corrected safe start-up pressure is used as the new safe start-up pressure to complete the safe start-up pressure correction.

[0139] Specifically, the safe take-off pressure correction model is as follows:

[0140] P corrected =P initial +α*A(T,P,RH)*W(T,P,RH)

[0141] Among them, P corrected For the corrected safe take-off pressure, P initial Let α be the initial safe starting pressure, T be the ambient temperature, P be the tank expansion pressure, RH be the ambient relative humidity, A(T, P, RH) be the attention weighting function, and W(T, P, RH) be the correction term function.

[0142] Example 4

[0143] This invention also proposes an electronic device, including a processor and a storage medium connected to the processor. The storage medium stores multiple instructions, which can be loaded and executed by the processor to enable the processor to execute the aforementioned method for correcting the safety tripping pressure of a liquefied gas tank.

[0144] Specifically, the electronic device in this embodiment can be a computer terminal, which may include one or more processors and a storage medium.

[0145] The storage medium can be used to store software programs and modules, such as the liquefied gas tank safety trip pressure correction method in this embodiment of the invention. The corresponding program instructions / modules allow the processor to execute various functional applications and data processing by running the software programs and modules stored in the storage medium, thus realizing the aforementioned liquefied gas tank safety trip pressure correction method. The storage medium may include high-speed random access storage media, and may also include non-volatile storage media, such as one or more magnetic storage systems, flash memory, or other non-volatile solid-state storage media. In some instances, the storage medium may further include storage media remotely configured relative to the processor, which can be connected to the terminal via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0146] The processor can call the information and application stored in the storage medium through the transmission system to perform the following steps: Step 101, obtain the expansion pressure of the liquefied gas tank, the initial safe starting pressure, the critical temperature of the liquefied gas tank and the critical pressure of the liquefied gas tank, as well as the ambient temperature and relative humidity of the environment in which the liquefied gas tank is located.

[0147] Step 102: Set the attention weight function and correction term function for the expansion pressure, the ambient temperature of the liquefied gas tank, and the relative humidity of the environment where the liquefied gas tank is located;

[0148] Specifically, the attention weight function A(T, P, TH) and the correction term function W(T, P, RH) are as follows:

[0149] A(T,P,RH)=β1*f1(T)+β2*f2(P)+β3*f3(RH)

[0150] W(T,P,RH)=γ1*g1(T,P)+γ2*g2(TH)

[0151] Wherein, β1, β2 and β3 are attention weight coefficients, f1(T) is the characteristic function of ambient temperature, f2(P) is the characteristic function of tank expansion pressure, f3(RH) is the characteristic function of ambient relative humidity, γ1 and γ2 are correction term coefficients, g1(T,P) is the correction term function of ambient temperature and tank expansion pressure, and g2(RH) is the correction term function of ambient relative humidity.

[0152] Specifically, the characteristic functions f1(T) for ambient temperature, f2(P) for tank expansion pressure, and f3(RH) for ambient relative humidity are as follows:

[0153]

[0154]

[0155] f3(RH)=k3RH+δ

[0156] Where k1 is the adjustment coefficient of the characteristic function of ambient temperature, k2 is the adjustment coefficient of the characteristic function of tank expansion pressure, n is the adjustment coefficient of tank expansion pressure, and k3 and δ are the characteristic functions of ambient relative humidity.

[0157] Specifically, the correction functions for ambient temperature g1(T, P), tank expansion pressure, and ambient relative humidity g2(RH) are as follows:

[0158] g1(T, P) = k4(TT) c )+k5(PP c )

[0159]

[0160] Where k4 and k5 are the adjustment coefficients of the correction term function for ambient temperature and tank expansion pressure, T c P is the critical temperature of the liquefied gas tank container. c K is the critical pressure of the liquefied gas tank, and k6 is the adjustment coefficient of the correction term function for the ambient relative humidity.

[0161] Step 103: Based on the initial safe start-up pressure, and in combination with the attention weight function and the correction term function, a safe start-up pressure correction model is set. When the liquefied gas tank reaches a filling rate of 98%, the corrected safe start-up pressure is calculated, and the corrected safe start-up pressure is used as the new safe start-up pressure to complete the safe start-up pressure correction.

[0162] Specifically, the safe take-off pressure correction model is as follows:

[0163] P corrected =P initial +α*A(T,P,RH)*W(T,P,RH)

[0164] Among them, P corrected For the corrected safe take-off pressure, P initial Let α be the initial safe starting pressure, T be the ambient temperature, P be the tank expansion pressure, RH be the ambient relative humidity, A(T, P, RH) be the attention weighting function, and W(T, P, RH) be the correction term function.

[0165] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0166] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0167] In the several embodiments provided by this invention, it should be understood that the disclosed technical content can be implemented in other ways. The system embodiments described above are merely illustrative; for example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between units or modules, and may be electrical or other forms.

[0168] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0169] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0170] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes: USB flash drives, read-only storage media (ROM), random access storage media (RAM), portable hard drives, magnetic disks, optical disks, and other media capable of storing program code.

[0171] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for correcting the safe tripping pressure of a liquefied gas tank, characterized in that, include: The expansion pressure, initial safe starting pressure, critical temperature and critical pressure of the liquefied gas tank are obtained, as well as the ambient temperature and relative humidity of the environment in which the liquefied gas tank is located. The attention weight function and correction term function are set for the expansion pressure, the ambient temperature of the environment where the liquefied gas tank is located, and the relative humidity of the environment where the liquefied gas tank is located; Based on the initial safe starting pressure, and combined with the attention weight function and the correction term function, a safe starting pressure correction model is set. When the liquefied gas tank reaches a filling rate of 98%, the corrected safe starting pressure is calculated, and the corrected safe starting pressure is used as the new safe starting pressure to complete the safe starting pressure correction. The safe take-off pressure correction model is as follows: in, The corrected safe takeoff pressure, For the initial safe take-off pressure, For correction factor, For ambient temperature, To increase tank pressure, For ambient relative humidity, For attention weight function, For the correction term function; Attention weight function and correction term function They are respectively: in, , and This is the attention weighting coefficient. The characteristic function of ambient temperature, Let be the characteristic function of the tank expansion pressure. Let relative humidity be a characteristic function of the environment. and For the correction term coefficient, This is a correction term function for ambient temperature and tank expansion pressure. This is a correction term function for the ambient relative humidity; Characteristic function of ambient temperature Characteristic function of tank expansion pressure Characteristic function of relative humidity They are respectively: in, This is the adjustment coefficient of the characteristic function of ambient temperature. The adjustment coefficient is the characteristic function of the expansion tank pressure. This is the adjustment coefficient for the expansion tank pressure. and The characteristic function of relative humidity of the environment; Ambient temperature Correction function for tank expansion pressure, correction function for ambient relative humidity. They are respectively: in, and This is the adjustment coefficient for the correction term function of ambient temperature and tank expansion pressure. This refers to the critical temperature of the liquefied gas tank container. This refers to the critical pressure of the liquefied gas tank container. This is the adjustment coefficient of the correction term function for ambient relative humidity.

2. A liquefied gas tank container safety tripping pressure correction system, characterized in that, include: The data acquisition module is used to acquire the expansion pressure, initial safe opening pressure, critical temperature and critical pressure of the liquefied gas tank, as well as the ambient temperature and relative humidity of the environment in which the liquefied gas tank is located. The function module is configured to set the attention weight function and correction term function for the expansion pressure, the ambient temperature of the liquefied gas tank, and the relative humidity of the environment where the liquefied gas tank is located; The correction module is used to set a safety start-up pressure correction model based on the initial safety start-up pressure, combined with the attention weight function and the correction term function. When the liquefied gas tank reaches a 98% filling rate, the corrected safety start-up pressure is calculated and used as the new safety start-up pressure to complete the safety start-up pressure correction. The safe take-off pressure correction model is as follows: in, The revised safe takeoff pressure, For the initial safe take-off pressure, For correction factor, For ambient temperature, To increase tank pressure, For ambient relative humidity, For attention weight function, For the correction term function; Attention weight function and correction term function They are respectively: in, , and This is the attention weighting coefficient. The characteristic function of ambient temperature, Let be the characteristic function of the tank expansion pressure. Let relative humidity be a characteristic function of the environment. and For the correction term coefficient, This is a correction term function for ambient temperature and tank expansion pressure. This is a correction term function for the ambient relative humidity; Characteristic function of ambient temperature Characteristic function of tank expansion pressure Characteristic function of ambient relative humidity They are respectively: in, The adjustment coefficient is the characteristic function of ambient temperature. The adjustment coefficient is the characteristic function of the expansion tank pressure. This is the adjustment coefficient for the expansion tank pressure. and The characteristic function of relative humidity in the environment; Ambient temperature Correction function for tank expansion pressure, correction function for ambient relative humidity. They are respectively: in, and This is the adjustment coefficient for the correction term function of ambient temperature and tank expansion pressure. This refers to the critical temperature of the liquefied gas tank container. This refers to the critical pressure of the liquefied gas tank container. This is the adjustment coefficient of the correction term function for ambient relative humidity.

Images