CN-121993260-A - Method, device and equipment for detecting natural gas residual pressure power generation efficiency

CN121993260ACN 121993260 ACN121993260 ACN 121993260ACN-121993260-A

Abstract

The specification relates to a method, a device and equipment for detecting natural gas residual pressure power generation efficiency, which comprise the steps of acquiring natural gas data of an expander, power output data of a generator and environment data, and calculating the natural gas data, the power output data and the environment data to obtain the natural gas residual pressure power generation efficiency. The method realizes the detection of the natural gas residual pressure power generation efficiency, and fills the technical blank that the natural gas residual pressure power generation efficiency cannot be detected in the prior art. The natural gas residual pressure power generation efficiency detected by the specification is an index of the natural gas residual pressure energy conversion rate, the power conversion capacity of the natural gas residual pressure power generation device is represented, the detected natural gas residual pressure power generation efficiency is applied, a worker can reasonably design a natural gas residual pressure power generation project, and the worker is guided to optimally adjust the natural gas power generation device, so that the utilization rate of the natural gas residual pressure is improved, and the purpose of improving the energy utilization rate is achieved.

Inventors

DONG QIJUN
LI JING
LIN DONG
JIANG GUOBIN
YUE TIANQI
WEI SIYU

Assignees

中国石油天然气股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241107

Claims (10)

1. The method for detecting the natural gas residual pressure power generation efficiency is applied to a natural gas residual pressure power generation device, and the natural gas residual pressure power generation device comprises an expander and a generator, and is characterized by comprising the following steps: Acquiring natural gas data of the expander, power output data of the generator and environment data; and calculating the natural gas data, the power output data and the environment data to obtain the natural gas residual pressure power generation efficiency.
2. The method of claim 1, wherein the natural gas data comprises an expander inlet natural gas temperature, an expander outlet natural gas temperature, an expander inlet natural gas pressure, an expander outlet natural gas pressure, a natural gas density, and a natural gas volumetric flow rate, the electrical power input data comprises generator power generation, and the environmental data comprises an ambient temperature; Calculating the natural gas data, the power output data and the environment data to obtain the natural gas residual pressure power generation efficiency comprises the following steps: Calculating the natural gas ratio according to the expander inlet natural gas temperature, the expander outlet natural gas temperature, the expander inlet natural gas pressure, the expander outlet natural gas pressure and the ambient temperature According to the natural gas ratio Natural gas density and natural gas volumetric flow calculation natural gas recovery Is recoverable from said natural gas Calculating natural gas pressure energy Generating power; According to the natural gas pressure energy And calculating the natural gas residual pressure power generation efficiency by using the power generation power and the power generation power of the generator.
3. The method according to claim 2, wherein the method further comprises: Measuring the molar gas constant and molar mass of the natural gas entering the expander; Calculating the natural gas ratio according to the expander inlet natural gas temperature, the expander outlet natural gas temperature, the expander inlet natural gas pressure, the expander outlet natural gas pressure and the ambient temperature The formula of (2) is: Wherein e x represents the natural gas ratio T 0 represents the ambient temperature, T 1 represents the expander inlet natural gas temperature, T 2 represents the expander outlet natural gas temperature, R represents the molar gas constant of the natural gas, M represents the molar mass of the natural gas, P 1 represents the expander inlet natural gas pressure, P 2 represents the expander outlet natural gas pressure, and C p represents the natural gas mass isobaric specific heat capacity calculated from the attribute data of the components in the natural gas.
4. A method according to claim 3, characterized in that the method further comprises: Measuring the attribute data of each component in the natural gas, wherein the attribute data comprises the density and the isobaric specific heat capacity of each component in the natural gas; and calculating the natural gas mass isobaric specific heat capacity according to the density and the isobaric specific heat capacity of each component.
5. The method of claim 4, wherein the formula for calculating the natural gas mass isobaric specific heat capacity from the density and isobaric specific heat capacity of each component is: Wherein n represents the number of components in the natural gas, wi represents the density of the ith component, cpi represents the isobaric specific heat capacity of the ith component, and cp_gas represents the isobaric specific heat capacity of air.
6. A method according to claim 3, characterized in that, according to the natural gas ratio Natural gas density and natural gas volumetric flow calculation natural gas recovery The formula of (2) is: E x ＝e x ×ρ×V; Wherein E x represents the natural gas recoverable system Ρ represents the natural gas density and V represents the natural gas volumetric flow.
7. The method of claim 6, wherein the natural gas is recoverable Calculating natural gas pressure energy The formula of the generated power is as follows: P t ＝E x /24/3600; Wherein P t represents the natural gas pressure energy Power generation.
8. The method of claim 7, wherein the natural gas pressure energy is based on The formula for calculating the natural gas residual pressure power generation efficiency by the power generation power of the generator is as follows: Wherein, the Representing the natural gas residual pressure power generation efficiency, and P r represents the power generated by the generator.
9. The utility model provides a detection device of natural gas residual pressure generating efficiency for corresponding natural gas residual pressure generating device's natural gas residual pressure generating efficiency detects, natural gas residual pressure generating device includes expander and generator, its characterized in that, the device includes: The data acquisition unit is used for acquiring natural gas data of the expander, electric power output data of the generator and environment data; and the natural gas residual pressure power generation efficiency calculation unit is used for calculating the natural gas data, the power output data and the environment 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 on the memory, characterized in that the processor, when executing the computer program, implements the method of any of claims 1 to 8.

Description

Method, device and equipment for detecting natural gas residual pressure power generation efficiency Technical Field The embodiment of the specification relates to the technical field of natural gas residual pressure conversion and utilization, in particular to a method, a device and equipment for detecting natural gas residual pressure power generation efficiency. Background The natural gas residual pressure power generation technology uses an expander to replace a traditional pressure regulating valve, and utilizes mechanical energy generated when high-pressure natural gas expands and reduces pressure to directly drive a generator to generate power. Natural gas in the high-pressure pipe network firstly enters an expander after being preheated by a preheater, a generator set is driven to generate power after depressurization, then the natural gas is heated by a heater to prevent the pipeline from being blocked by moisture condensation, and the heated natural gas is output to the low-pressure natural gas pipe network. The natural gas residual pressure power generation system converts pressure energy into electric energy and cold energy, so that residual pressure resources are recovered. At present, energy-saving monitoring mainly aims at energy-consuming equipment and an energy-consuming system, and a specific energy-saving monitoring method is not provided for a natural gas residual pressure power generation conversion utilization device, so that the equipment operation condition cannot be evaluated from the energy-saving angle. Is not beneficial to the selection and energy-saving management of the residual pressure power generation process (turbine, double rotors and screw). Disclosure of Invention In order to solve the problems in the prior art, the embodiment of the specification provides a method, a device and equipment for detecting the natural gas residual pressure power generation efficiency, and the detection of the natural gas residual pressure power generation efficiency is realized. The specific technical scheme of the embodiment of the specification is as follows: In one aspect, an embodiment of the present disclosure provides a method for detecting a natural gas residual pressure power generation efficiency, which is applied to a natural gas residual pressure power generation device, where the natural gas residual pressure power generation device includes an expander and a generator, and the method includes: Acquiring natural gas data of the expander, power output data of the generator and environment data; and calculating the natural gas data, the power output data and the environment data to obtain the natural gas residual pressure power generation efficiency. Further, the natural gas data comprises an expander inlet natural gas temperature, an expander outlet natural gas temperature, an expander inlet natural gas pressure, an expander outlet natural gas pressure, a natural gas density, and a natural gas volumetric flow, the power input data comprises generator power generation, and the environmental data comprises an environmental temperature; Calculating the natural gas data, the power output data and the environment data to obtain the natural gas residual pressure power generation efficiency comprises the following steps: Calculating the natural gas ratio according to the expander inlet natural gas temperature, the expander outlet natural gas temperature, the expander inlet natural gas pressure, the expander outlet natural gas pressure and the ambient temperature ; According to the natural gas ratioCalculation of natural gas recovery from natural gas density and natural gas volumetric flow; Is recoverable from said natural gasCalculating natural gas pressure energyGenerating power; According to the natural gas pressure energy And calculating the natural gas residual pressure power generation efficiency by using the power generation power and the power generation power of the generator. Further, the method further comprises: Measuring the molar gas constant and molar mass of the natural gas entering the expander; Calculating the natural gas ratio according to the expander inlet natural gas temperature, the expander outlet natural gas temperature, the expander inlet natural gas pressure, the expander outlet natural gas pressure and the ambient temperature The formula of (2) is: Wherein e x represents the natural gas ratio T 0 represents the ambient temperature, T 1 represents the expander inlet natural gas temperature, T 2 represents the expander outlet natural gas temperature, R represents the molar gas constant of the natural gas, M represents the molar mass of the natural gas, P 1 represents the expander inlet natural gas pressure, P 2 represents the expander outlet natural gas pressure, and C p represents the natural gas mass isobaric specific heat capacity calculated from the attribute data of the components in the natural gas. Further, the method further comprises: Measuring the attri