Method, device and equipment for detecting natural gas excess pressure power generation efficiency

Abstract

The invention relates to a natural gas excess pressure power generation efficiency detection method, device and equipment. The method comprises the steps of obtaining natural gas data of an expansion machine, power output data of a power generator and environment data; and calculating the natural gas data, the power output data and the environment data to obtain the natural gas excess pressure power generation efficiency. The detection of the natural gas excess pressure power generation efficiency is realized, and the technical blank that the natural gas excess pressure power generation efficiency cannot be detected in the prior art is filled. The natural gas excess pressure power generation efficiency detected in the specification is an index of the natural gas excess pressure energy conversion rate, and represents the electric energy conversion capability of the natural gas excess pressure power generation device. Workers can reasonably design a natural gas excess pressure power generation project and guide the workers to optimize and adjust the natural gas power generation device, so that the utilization rate of natural gas excess pressure is improved, and the purpose of improving the energy utilization rate is achieved.

Description

Technical Field

[0001] The embodiments in this specification relate to the field of natural gas residual pressure conversion and utilization technology, and in particular to a method, apparatus and equipment for detecting the power generation efficiency of natural gas residual pressure. Background Technology

[0002] Natural gas pressure recovery power generation technology uses an expander instead of a traditional pressure regulating valve, utilizing the mechanical energy generated when high-pressure natural gas expands and depressurizes to directly drive a generator. Natural gas in the high-pressure pipeline network is first preheated by a preheater before entering the expander. After depressurization, it drives the generator set to generate electricity. The gas is then heated again by a heater to prevent moisture condensation from causing pipeline blockages. The heated natural gas is then output to the low-pressure natural gas pipeline network. The natural gas pressure recovery power generation system converts pressure energy into electrical and cooling energy, thus recovering excess pressure resources.

[0003] Currently, energy conservation monitoring mainly targets energy-consuming equipment and systems. There are no specific energy conservation monitoring methods for natural gas waste pressure power generation and utilization devices, making it impossible to evaluate equipment operation from an energy conservation perspective. This hinders the selection of waste pressure power generation processes (turbine, dual rotor, screw) and energy conservation management. Summary of the Invention

[0004] To address the problems existing in the prior art, this specification provides a method, apparatus, and equipment for detecting the efficiency of natural gas residual pressure power generation, thereby enabling the detection of natural gas residual pressure power generation efficiency.

[0005] The specific technical solutions of the embodiments in this specification are as follows:

[0006] On one hand, this specification provides a method for detecting the efficiency of natural gas waste pressure power generation, applied to a natural gas waste pressure power generation device, which includes an expander and a generator. The method includes:

[0007] Acquire natural gas data from the expander, power output data from the generator, and environmental data;

[0008] The natural gas residual pressure power generation efficiency is obtained by calculating the natural gas data, power output data, and environmental data.

[0009] Furthermore, the natural gas data includes the expander inlet natural gas temperature, expander outlet natural gas temperature, expander inlet natural gas pressure, expander outlet natural gas pressure, natural gas density, and natural gas volumetric flow rate; the power input data includes the generator power output; and the environmental data includes the ambient temperature.

[0010] Calculations were performed on the natural gas data, power output data, and environmental data to obtain the natural gas residual pressure power generation efficiency, including:

[0011] The natural gas ratio is calculated based on the expander inlet natural gas temperature, expander outlet natural gas temperature, expander inlet natural gas pressure, expander outlet natural gas pressure, and ambient temperature. ;

[0012] According to the natural gas ratio Natural gas density and natural gas volumetric flow rate calculations for natural gas recovery ;

[0013] According to the description of natural gas recyclability Calculate the pressure energy of natural gas Power generation capacity;

[0014] According to the natural gas pressure energy The power generation capacity and the power generation capacity of the generator are used to calculate the power generation efficiency of the natural gas residual pressure.

[0015] Furthermore, the method also includes:

[0016] Measure the molar gas constant and molar mass of the natural gas entering the expander;

[0017] The natural gas ratio is calculated based on the expander inlet natural gas temperature, expander outlet natural gas temperature, expander inlet natural gas pressure, expander outlet natural gas pressure, and ambient temperature. The formula is:

[0018]

[0019] Among them, e x Indicates the natural gas ratio T0 represents the ambient temperature, T1 represents the inlet natural gas temperature of the expander, T2 represents the outlet natural gas temperature of the expander, R represents the molar gas constant of the natural gas, M represents the molar mass of the natural gas, P1 represents the inlet natural gas pressure of the expander, P2 represents the outlet natural gas pressure of the expander, and C... p This represents the mass isobaric specific heat capacity of natural gas, wherein the mass isobaric specific heat capacity of natural gas is calculated based on the property data of each component in the natural gas.

[0020] Furthermore, the method also includes:

[0021] The property data of each component in the natural gas are measured, including the density and isobaric specific heat capacity of each component in the natural gas;

[0022] The mass isobaric specific heat capacity of the natural gas is calculated based on the density and isobaric specific heat capacity of each component.

[0023] Furthermore, the formula for calculating the mass isobaric specific heat capacity of the natural gas based on the density and isobaric specific heat capacity of each component is as follows:

[0024]

[0025] Where n represents the number of components in the natural gas, wi represents the density of the i-th component, cpi represents the isobaric specific heat capacity of the i-th component, and cp_gas represents the isobaric specific heat capacity of air.

[0026] Furthermore, based on the aforementioned natural gas ratio Natural gas density and natural gas volumetric flow rate calculations for natural gas recovery The formula is:

[0027] E x =e x ×ρ×V;

[0028] Among them, E x This indicates that the natural gas is recyclable. ρ represents the density of the natural gas, and V represents the volumetric flow rate of the natural gas.

[0029] Furthermore, according to the aforementioned natural gas recyclability Calculate the pressure energy of natural gas The formula for power generation is:

[0030] P t =E x / 24 / 3600;

[0031] Among them, P t Indicates the pressure energy of the natural gas Power generation capacity.

[0032] Furthermore, based on the aforementioned natural gas pressure energy The formula for calculating the power generation efficiency of the natural gas residual pressure generator, based on the power generation capacity and the generator's power output, is as follows:

[0033]

[0034] in, P represents the power generation efficiency of the natural gas residual pressure. r This indicates the power output of the generator.

[0035] On the other hand, embodiments of this specification also provide a device for detecting the efficiency of natural gas residual pressure power generation, used to detect the efficiency of natural gas residual pressure power generation corresponding to a natural gas residual pressure power generation device, wherein the natural gas residual pressure power generation device includes an expander and a generator, and the device includes:

[0036] The data acquisition unit is used to acquire natural gas data from the expander, power output data from the generator, and environmental data.

[0037] The natural gas residual pressure power generation efficiency calculation unit is used to calculate the natural gas data, power output data, and environmental data to obtain the natural gas residual pressure power generation efficiency.

[0038] On the other hand, embodiments of this specification also provide a computer device, including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the above-described method.

[0039] In the embodiments of this specification, the natural gas waste pressure power generation efficiency of the natural gas waste pressure power generation device is calculated based on the natural gas data from the expander, the power output data from the generator, and environmental data. This enables the detection of natural gas waste pressure power generation efficiency, filling a technological gap in the prior art where it was impossible to detect natural gas waste pressure power generation efficiency. The natural gas waste pressure power generation efficiency detected in the embodiments of this specification is an indicator of the energy conversion rate of natural gas waste pressure, representing the level of electrical energy conversion capability of the natural gas waste pressure power generation device. By applying the detected natural gas waste pressure power generation efficiency, operators can rationally design natural gas waste pressure power generation projects and guide operators to optimize and adjust natural gas power generation devices, thereby improving the utilization rate of natural gas waste pressure and ultimately achieving the goal of improving energy utilization efficiency. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 The figure shown is a schematic diagram of the implementation system of a method for detecting the efficiency of natural gas residual pressure power generation in an embodiment of this specification;

[0042] Figure 2 The diagram shown is a flowchart illustrating a method for detecting the efficiency of natural gas residual pressure power generation according to an embodiment of this specification.

[0043] Figure 3 The diagram shown is a schematic diagram of the measurement data points on the natural gas residual pressure power generation device in the embodiments of this specification;

[0044] Figure 4 The diagram shown is a flowchart illustrating the calculation of natural gas residual pressure power generation efficiency based on the natural gas data, power output data, and environmental data in an embodiment of this specification.

[0045] Figure 5 The diagram shown is a flowchart illustrating the calculation of the mass isobaric specific heat capacity of natural gas in an embodiment of this specification.

[0046] Figure 6 The diagram shown is a structural schematic of a gas residual pressure power generation efficiency detection device according to an embodiment of this specification.

[0047] Figure 7 The diagram shown is a structural schematic of the computer device in an embodiment of this specification.

[0048] [Explanation of Figure Markers]:

[0049] 101. Terminal;

[0050] 102. Server;

[0051] 601. Data Acquisition Unit;

[0052] 602. Natural Gas Residual Pressure Power Generation Efficiency Calculation Unit;

[0053] 702. Computer equipment;

[0054] 704. Processing equipment;

[0055] 706. Storage resources;

[0056] 708. Drive system;

[0057] 710. Input / Output Module;

[0058] 712. Input devices;

[0059] 714. Output devices;

[0060] 716. Presentation equipment;

[0061] 718. Graphical User Interface;

[0062] 720. Network interface;

[0063] 722. Communication link;

[0064] 724. Communication bus. Detailed Implementation

[0065] The technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the embodiments of this specification, and not all embodiments. Based on the embodiments of this specification, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the embodiments of this specification.

[0066] It should be noted that the terms "first," "second," etc., in the description, claims, and accompanying drawings of the embodiments herein are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the embodiments described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, apparatus, product, or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0067] It should be noted that the acquisition, storage, use, and processing of data in the technical solutions of the embodiments of this specification all comply with the relevant provisions of national laws and regulations.

[0068] It should be noted that in the embodiments of this specification, certain software, components, models and other existing solutions in the industry may be mentioned. These should be regarded as exemplary and are only intended to illustrate the feasibility of implementing the technical solution of this application. However, they do not mean that the applicant has used or necessarily used the solution.

[0069] like Figure 1 The diagram illustrates an implementation system for a method of detecting the efficiency of natural gas residual pressure power generation, as described in this specification. The system includes a terminal 101 and a server 102. The terminal 101 and server 102 can communicate via a network, which may include a local area network (LAN), a wide area network (WAN), the Internet, or a combination thereof, and is connected to a website, user equipment (e.g., a computing device), and a backend system.

[0070] Terminal 101 can be a sensor that collects natural gas data from the expander, power output data from the generator, and environmental data, and then transmits the collected data to server 102.

[0071] Server 102 receives natural gas data from the expansion turbine, power output data from the generator, and environmental data collected by sensors. This data is then cached, and a pre-written interface program is called to calculate the natural gas residual pressure power generation efficiency. The calculated efficiency can be displayed to staff, facilitating the design of natural gas residual pressure power generation projects and guiding optimization and adjustment of the natural gas power generation equipment.

[0072] Alternatively, server 102 may be a node of a cloud computing system (not shown in the figure), or each server may be a separate cloud computing system comprising multiple computers interconnected by a network and operating as a distributed processing system.

[0073] In addition, it should be noted that, Figure 1 The examples shown are merely one application environment provided by the embodiments in this specification. In practical applications, other application environments may also be included, and this specification does not impose any limitations.

[0074] To address the problems existing in the prior art, this specification provides a method for detecting the efficiency of natural gas residual pressure power generation. This method achieves the detection of natural gas residual pressure power generation efficiency. Figure 2 The diagram shows a flowchart illustrating the method for detecting the efficiency of natural gas waste pressure power generation in an embodiment of this specification. This diagram describes the process of acquiring relevant data from the natural gas waste pressure power generation device and calculating the natural gas waste pressure power generation efficiency based on the acquired data. The order of steps listed in the embodiment is merely one possible execution order among many steps and does not represent the only possible execution order. In actual system or device products, the methods shown in the embodiments or accompanying drawings can be executed sequentially or in parallel.

[0075] Specific examples Figure 2 As shown, the method may include:

[0076] Step 201: Obtain the natural gas data of the expander, the power output data of the generator, and environmental data;

[0077] Step 202: Calculate the natural gas data, power output data, and environmental data to obtain the natural gas residual pressure power generation efficiency.

[0078] In the embodiments of this specification, the natural gas waste pressure power generation efficiency of the natural gas waste pressure power generation device is calculated based on the natural gas data from the expander, the power output data from the generator, and environmental data. This enables the detection of natural gas waste pressure power generation efficiency, filling a technological gap in the prior art where it was impossible to detect natural gas waste pressure power generation efficiency. The natural gas waste pressure power generation efficiency detected in the embodiments of this specification is an indicator of the energy conversion rate of natural gas waste pressure, representing the level of electrical energy conversion capability of the natural gas waste pressure power generation device. By applying the detected natural gas waste pressure power generation efficiency, operators can rationally design natural gas waste pressure power generation projects and guide operators to optimize and adjust natural gas power generation devices, thereby improving the utilization rate of natural gas waste pressure and ultimately achieving the goal of improving energy utilization efficiency.

[0079] It should be noted that the embodiments in this specification do not limit the specific application of natural gas residual pressure power generation efficiency. The embodiments in this specification mainly solve the problem that the efficiency of natural gas residual pressure power generation devices cannot be calculated in the prior art, fill the technical gap in calculating the efficiency of natural gas residual pressure power generation, and play a key role in the development of natural gas residual pressure power generation technology.

[0080] Specifically, such as Figure 3 The diagram shown is a schematic of the measurement data points on the natural gas residual pressure power generation device according to an embodiment of this specification. It includes an expander and a generator. Natural gas flows into the expander, and after being depressurized, it drives the generator to generate electricity. The natural gas data in this embodiment includes the expander inlet natural gas temperature, expander outlet natural gas temperature, expander inlet natural gas pressure, expander outlet natural gas pressure, natural gas density, and natural gas volumetric flow rate. The power input data includes the generator's power output, and the environmental data includes the ambient temperature.

[0081] Feasibly, temperature and pressure sensors can be deployed at both the expander inlet and outlet to obtain the natural gas temperature, outlet temperature, inlet pressure, and outlet pressure. Density and volumetric flow sensors can be deployed in the natural gas line to obtain the natural gas density and volumetric flow rate. Voltage and current sensors can be deployed on the generator to collect the generator output current and voltage, and calculate the generator power output. Temperature sensors can be deployed in the environment where the natural gas residual pressure power generation unit is located to collect the ambient temperature.

[0082] Then, the interface functions pre-written by the staff can be called to calculate the natural gas inlet temperature, natural gas outlet temperature, natural gas inlet pressure, natural gas outlet pressure, natural gas density, natural gas volumetric flow rate, generator power output, and ambient temperature, so as to obtain the natural gas residual pressure power generation efficiency.

[0083] According to one embodiment of this specification, such as Figure 4 As shown, calculations are performed on the natural gas data, power output data, and environmental data to obtain the natural gas residual pressure power generation efficiency, including:

[0084] Step 401: Calculate the natural gas ratio based on the expander inlet natural gas temperature, expander outlet natural gas temperature, expander inlet natural gas pressure, expander outlet natural gas pressure, and ambient temperature. ;

[0085] Step 402: Based on the stated natural gas ratio Natural gas density and natural gas volumetric flow rate calculations for natural gas recovery ;

[0086] Step 403: Based on the described natural gas recoverability Calculate the pressure energy of natural gas Power generation capacity;

[0087] Step 404: Based on the natural gas pressure energy The power generation capacity and the power generation capacity of the generator are used to calculate the power generation efficiency of the natural gas residual pressure.

[0088] Staff can follow Figure 4 The method shown is used to write an interface function for calculating the power generation efficiency of natural gas residual pressure, and the interface function is encapsulated in the application of server 102.

[0089] In the embodiments described in this specification, the natural gas ratio is calculated based on the expander inlet natural gas temperature, expander outlet natural gas temperature, expander inlet natural gas pressure, expander outlet natural gas pressure, and ambient temperature. The formula is (1):

[0090]

[0091] Among them, e x Indicates the natural gas ratio T0 represents the ambient temperature (K), T1 represents the natural gas temperature at the expander inlet (K), T2 represents the natural gas temperature at the expander outlet (K), R represents the molar gas constant of the natural gas (kJ / (kg·K)), and M represents the molar mass of the natural gas (kg / kmol). The molar gas constant and molar mass of the natural gas can be obtained by querying a database or through actual measurement; this specification does not limit the specific measurements. P1 represents the natural gas pressure at the expander inlet (KPa), P2 represents the natural gas pressure at the expander outlet (KPa), and C... p The isobaric specific heat capacity of natural gas (kJ / (kg·K)) is expressed as such, wherein the isobaric specific heat capacity of natural gas is calculated based on the property data of each component in the natural gas.

[0092] According to one embodiment of this specification, such as Figure 5 As shown, the method further includes:

[0093] Step 501: Measure the property data of each component in the natural gas, the property data including the density and isobaric specific heat capacity of each component in the natural gas;

[0094] Step 502: Calculate the mass isobaric specific heat capacity of the natural gas based on the density and isobaric specific heat capacity of each component.

[0095] In the embodiments of this specification, the components of natural gas can be analyzed in advance using existing component analysis instruments, and the density and isobaric specific heat capacity of each component can be measured. The results are then stored in a database. When calculating the power generation efficiency of natural gas residual pressure, the density and isobaric specific heat capacity of each component of natural gas can be queried from the database using an SQL script, thereby calculating the mass isobaric specific heat capacity of natural gas.

[0096] In the embodiments of this specification, the formula for calculating the mass isobaric specific heat capacity of the natural gas based on the density and isobaric specific heat capacity of each component is (2):

[0097]

[0098] Where n represents the number of components in the natural gas, wi represents the density (g / L) of the i-th component, cpi represents the isobaric specific heat capacity (kJ / (kg·K)) of the i-th component, and cp_gas represents the isobaric specific heat capacity (kJ / (kg·K)) of air.

[0099] In the embodiments described in this specification, the isobaric specific heat capacity of air, cp_gas, is approximately equal to 1.005 kJ / (kg·K).

[0100] In the embodiments described in this specification, based on the natural gas ratio Natural gas density and natural gas volumetric flow rate calculations for natural gas recovery The formula is (3):

[0101] E x =e x ×ρ×V (3)

[0102] Among them, E x This indicates that the natural gas is recyclable. (kJ / (kg·K)), ρ represents the density of the natural gas (g / L), and V represents the volumetric flow rate of the natural gas (Nm³). 3 / d).

[0103] According to the description of natural gas recyclability Calculate the pressure energy of natural gas The formula for power generation is (4):

[0104]

[0105] Among them, P t Indicates the pressure energy of the natural gas Power generation capacity (kW).

[0106] According to the natural gas pressure energy The formula for calculating the power generation efficiency of the natural gas residual pressure power generation based on the power generation capacity and the power generation capacity of the generator is (5):

[0107]

[0108] in, P represents the natural gas residual pressure power generation efficiency (%). r This indicates the generator's power output (kW).

[0109] In the embodiments described in this specification, the following continues... Figure 3 As shown, pressure sensors can also be deployed in the environment to obtain atmospheric pressure and calculate the power factor based on the generator data, so that staff can analyze the reasons for the high or low efficiency of natural gas residual pressure power generation based on atmospheric pressure, power factor, etc.

[0110] For example, the main instruments and meters for monitoring residual pressure power generation equipment are shown in Table 1:

[0111] Table 1. Main Instruments and Meters for Monitoring Overpressure Power Generation Equipment

[0112]

[0113] For example, the requirements for testing the efficiency of natural gas waste pressure power generation are as follows:

[0114] (1) Testing should begin 1 hour after the natural gas residual pressure power generation unit has been running stably.

[0115] (2) During the testing period, the pressure fluctuation of the upstream and downstream pipelines of the natural gas residual pressure power generation system under test should be within ±1%, and the operating conditions should remain stable.

[0116] (3) During the testing period, the operating conditions of the natural gas residual pressure power generation unit under testing should meet the following stable conditions:

[0117] a) The fluctuation range of the rotation speed within 5 minutes is within ±0.5%.

[0118] b) The fluctuation range of the inlet pressure within 5 minutes is within ±2%.

[0119] c) The fluctuation range of the inlet temperature within 5 minutes is within ±0.5℃.

[0120] (4) All parameters of the natural gas residual pressure power generation device should be measured at the same time. The time interval for measuring data of the same type of electrical properties should be consistent, with an interval of 5 min to 15 min. There should be no less than 4 sets of continuous tests.

[0121] (5) Process gas sampling operations shall be carried out in accordance with the provisions of GB / T 13609.

[0122] (6) The determination of natural gas components shall be carried out in accordance with the provisions of GB / T 13610.

[0123] Based on the same inventive concept, embodiments of this specification also provide a device for detecting the efficiency of natural gas residual pressure power generation, used to detect the efficiency of natural gas residual pressure power generation corresponding to a natural gas residual pressure power generation device, wherein the natural gas residual pressure power generation device includes an expander and a generator, such as... Figure 6 As shown, the device includes:

[0124] The data acquisition unit 601 is used to acquire natural gas data of the expander, power output data of the generator, and environmental data;

[0125] The natural gas residual pressure power generation efficiency calculation unit 602 is used to calculate the natural gas data, power output data and environmental data to obtain the natural gas residual pressure power generation efficiency.

[0126] Furthermore, the natural gas data includes the expander inlet natural gas temperature, expander outlet natural gas temperature, expander inlet natural gas pressure, expander outlet natural gas pressure, natural gas density, and natural gas volumetric flow rate; the power input data includes the generator power output; and the environmental data includes the ambient temperature.

[0127] Calculations were performed on the natural gas data, power output data, and environmental data to obtain the natural gas residual pressure power generation efficiency, including:

[0128] The natural gas ratio is calculated based on the expander inlet natural gas temperature, expander outlet natural gas temperature, expander inlet natural gas pressure, expander outlet natural gas pressure, and ambient temperature. ;

[0129] According to the natural gas ratio Natural gas density and natural gas volumetric flow rate calculations for natural gas recovery ;

[0130] According to the description of natural gas recyclability Calculate the pressure energy of natural gas Power generation capacity;

[0131] According to the natural gas pressure energy The power generation capacity and the power generation capacity of the generator are used to calculate the power generation efficiency of the natural gas residual pressure.

[0132] Furthermore, the data acquisition unit 601 is further configured to: measure the molar gas constant and molar mass of the natural gas entering the expander;

[0133] The natural gas ratio is calculated based on the expander inlet natural gas temperature, expander outlet natural gas temperature, expander inlet natural gas pressure, expander outlet natural gas pressure, and ambient temperature. The formula is:

[0134]

[0135] Among them, e x Indicates the natural gas ratio T0 represents the ambient temperature, T1 represents the inlet natural gas temperature of the expander, T2 represents the outlet natural gas temperature of the expander, R represents the molar gas constant of the natural gas, M represents the molar mass of the natural gas, P1 represents the inlet natural gas pressure of the expander, P2 represents the outlet natural gas pressure of the expander, and C... p This represents the mass isobaric specific heat capacity of natural gas, wherein the mass isobaric specific heat capacity of natural gas is calculated based on the property data of each component in the natural gas.

[0136] Furthermore, the data acquisition unit 601 is further configured to: measure the attribute data of each component in the natural gas, the attribute data including the density and isobaric specific heat capacity of each component in the natural gas;

[0137] The natural gas residual pressure power generation efficiency calculation unit 602 is further used to: calculate the mass isobaric specific heat capacity of the natural gas based on the density and isobaric specific heat capacity of each component.

[0138] Furthermore, the formula for calculating the mass isobaric specific heat capacity of the natural gas based on the density and isobaric specific heat capacity of each component is as follows:

[0139]

[0140] Where n represents the number of components in the natural gas, wi represents the density of the i-th component, cpi represents the isobaric specific heat capacity of the i-th component, and cp_gas represents the isobaric specific heat capacity of air.

[0141] Furthermore, based on the aforementioned natural gas ratio Natural gas density and natural gas volumetric flow rate calculations for natural gas recovery The formula is:

[0142] E x =e x ×ρ×V;

[0143] Among them, E x This indicates that the natural gas is recyclable. ρ represents the density of the natural gas, and V represents the volumetric flow rate of the natural gas.

[0144] Furthermore, according to the aforementioned natural gas recyclability Calculate the pressure energy of natural gas The formula for power generation is:

[0145] P t =E x / 24 / 3600;

[0146] Among them, P t Indicates the pressure energy of the natural gas Power generation capacity.

[0147] Furthermore, based on the aforementioned natural gas pressure energy The formula for calculating the power generation efficiency of the natural gas residual pressure generator, based on the power generation capacity and the generator's power output, is as follows:

[0148]

[0149] in, P represents the power generation efficiency of the natural gas residual pressure. r This indicates the power output of the generator.

[0150] Since the principle of the above-mentioned device in solving the problem is similar to that of the above-mentioned method, the implementation of the above-mentioned system can refer to the implementation of the above-mentioned method, and the repeated parts will not be described again.

[0151] like Figure 7 The diagram illustrates the structure of a computer device according to an embodiment of this specification. The computer device in this embodiment is capable of executing the methods described in the embodiments of this specification. The computer device 702 may include one or more processing devices 704, such as one or more central processing units (CPUs), each of which may implement one or more hardware threads. The computer device 702 may also include any storage resource 706 for storing information of any kind, such as code, settings, data, etc. Without limitation, for example, the storage resource 706 may include any type of RAM, any type of ROM, flash memory, hard disk, optical disk, etc. More generally, any storage resource can use any technology to store information. Furthermore, any storage resource may provide volatile or non-volatile retention of information. Furthermore, any storage resource may represent a fixed or removable component of the computer device 702. In one case, when the processing device 704 executes associated instructions stored in any storage resource or combination of storage resources, the computer device 702 may perform any operation of the associated instructions. The computer device 702 also includes one or more drive systems 708 for interacting with any storage resources, such as hard disk drive systems, optical disk drive systems, etc.

[0152] Computer device 702 may also include an input / output module 710 (I / O) for receiving various inputs (via input device 712) and providing various outputs (via output device 714). A specific output mechanism may include a presentation device 716 and an associated graphical user interface (GUI) 718. In other embodiments, the input / output module 710 (I / O), input device 712, and output device 714 may be omitted, and the device may function solely as a computer device within a network. Computer device 702 may also include one or more network interfaces 720 for exchanging data with other devices via one or more communication links 722. One or more communication buses 724 couple the components described above together.

[0153] Communication link 722 can be implemented in any way, such as via a local area network, a wide area network (e.g., the Internet), a point-to-point connection, or any combination thereof. Communication link 722 may include any combination of hardwired links, wireless links, routers, gateway functions, name servers, etc., governed by any protocol or combination of protocols.

[0154] This specification also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method.

[0155] This specification also provides computer-readable instructions, wherein when a processor executes the instructions, the program therein causes the processor to perform the above-described method.

[0156] It should be understood that in the various embodiments of this specification, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this specification.

[0157] It should also be understood that, in the embodiments of this specification, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the embodiments of this specification, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0158] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed in this specification can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of each example have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of the embodiments in this specification.

[0159] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0160] In the embodiments provided in this specification, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, 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 couplings or direct couplings or communication connections shown or discussed may be indirect couplings or communication connections through some interfaces, devices, or units, or they may be electrical, mechanical, or other forms of connection.

[0161] 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 the embodiments described in this specification, depending on actual needs.

[0162] Furthermore, the functional units in the various embodiments of this specification 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.

[0163] 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 solutions of the embodiments of this specification, in essence, or the parts that contribute to the prior art, or all or part of the technical solutions, 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 this specification. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0164] This specification describes the principles and implementation methods of the embodiments using specific examples. The above descriptions of the embodiments are only for the purpose of helping to understand the methods and core ideas of the embodiments in this specification. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the embodiments in this specification. Therefore, the content of this specification should not be construed as a limitation on the embodiments in this specification.

Claims

1. A method for detecting the efficiency of natural gas residual pressure power generation, applied to a natural gas residual pressure power generation device, the natural gas residual pressure power generation device comprising an expander and a generator, characterized in that, The method includes: Acquire natural gas data from the expander, power output data from the generator, and environmental data; The natural gas residual pressure power generation efficiency is obtained by calculating the natural gas data, power output data, and environmental data.

2. The method according to claim 1, characterized in that, The natural gas data includes the expander inlet natural gas temperature, expander outlet natural gas temperature, expander inlet natural gas pressure, expander outlet natural gas pressure, natural gas density, and natural gas volumetric flow rate; the power input data includes the generator power output; and the environmental data includes the ambient temperature. Calculations were performed on the natural gas data, power output data, and environmental data to obtain the natural gas residual pressure power generation efficiency, including: The natural gas ratio is calculated based on the expander inlet natural gas temperature, expander outlet natural gas temperature, expander inlet natural gas pressure, expander outlet natural gas pressure, and ambient temperature. According to the natural gas ratio Natural gas density and natural gas volumetric flow rate calculations for natural gas recovery According to the description of natural gas recyclability Calculate the pressure energy of natural gas Power generation capacity; According to the natural gas pressure energy The power generation capacity and the power generation capacity of the generator are used to calculate the power generation efficiency of the natural gas residual pressure.

3. The method according to claim 2, characterized in that, The method further includes: Measure the molar gas constant and molar mass of the natural gas entering the expander; The natural gas ratio is calculated based on the expander inlet natural gas temperature, expander outlet natural gas temperature, expander inlet natural gas pressure, expander outlet natural gas pressure, and ambient temperature. The formula is: Among them, e x Indicates the natural gas ratio T0 represents the ambient temperature, T1 represents the natural gas temperature at the expander inlet, T2 represents the natural gas temperature at the expander outlet, R represents the molar gas constant of the natural gas, M represents the molar mass of the natural gas, P1 represents the natural gas pressure at the expander inlet, P2 represents the natural gas pressure at the expander outlet, and C... p This represents the mass isobaric specific heat capacity of natural gas, wherein the mass isobaric specific heat capacity of natural gas is calculated based on the property data of each component in the natural gas.

4. The method according to claim 3, characterized in that, The method further includes: The property data of each component in the natural gas are measured, including the density and isobaric specific heat capacity of each component in the natural gas; The mass isobaric specific heat capacity of the natural gas is calculated based on the density and isobaric specific heat capacity of each component.

5. The method according to claim 4, characterized in that, The formula for calculating the mass isobaric specific heat capacity of the natural gas based on the density and isobaric specific heat capacity of each component is as follows: Where n represents the number of components in the natural gas, wi represents the density of the i-th component, cpi represents the isobaric specific heat capacity of the i-th component, and cp_gas represents the isobaric specific heat capacity of air.

6. The method according to claim 3, characterized in that, According to the natural gas ratio Natural gas density and natural gas volumetric flow rate calculations for natural gas recovery The formula is: AND x =and x ×ρ×V; Among them, E x This indicates that the natural gas is recyclable. ρ represents the density of the natural gas, and V represents the volumetric flow rate of the natural gas.

7. The method according to claim 6, characterized in that, According to the description of natural gas recyclability Calculate the pressure energy of natural gas The formula for power generation is: P t =And x / 24 / 3600; Among them, P t Indicates the pressure energy of the natural gas Power generation capacity.

8. The method according to claim 7, characterized in that, According to the natural gas pressure energy The formula for calculating the power generation efficiency of the natural gas residual pressure generator, based on the power generation capacity and the generator's power output, is as follows: in, P represents the power generation efficiency of the natural gas residual pressure. r This indicates the power output of the generator.

9. A device for detecting the efficiency of natural gas residual pressure power generation, used to detect the efficiency of natural gas residual pressure power generation in a corresponding natural gas residual pressure power generation device, wherein the natural gas residual pressure power generation device includes an expander and a generator, characterized in that, The device includes: The data acquisition unit is used to acquire natural gas data from the expander, power output data from the generator, and environmental data. The natural gas residual pressure power generation efficiency calculation unit is used to calculate the natural gas data, power output data, and environmental data to obtain the natural gas residual pressure power generation efficiency.

10. A computer device comprising a memory, a processor, and a computer program stored in the memory, characterized in that, When the processor executes the computer program, it implements the method according to any one of claims 1 to 8.

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