A method and system for monitoring carbon emissions based on single-point flow velocity measurement

Abstract

The present invention discloses a carbon emission monitoring method and system based on single-point velocity measurement. The distribution of flue gas in the pipeline is obtained by calculating the relevant parameters of the flue gas in the pipeline, and multiple groups of data are fitted according to the data of the velocity at the measuring point and the velocity of the measuring cross-section under different conditions to realize the calculation of the average flow rate of the cross-section flue gas under single-point measurement, thereby improving the accuracy of flue gas velocity measurement and saving the operation and maintenance workload. On the basis of the fitting relationship, the instantaneous flow rate of flue gas under standard conditions is obtained according to the instantaneous flow rate of flue gas in the cross-section, in order to obtain more standardized flue gas flow information. Finally, according to the total amount of flue gas flow emissions flowing through the pipeline under standard conditions and the mass concentration of carbon dioxide, the total amount of carbon dioxide emissions flowing through the pipeline is obtained to realize accurate monitoring of carbon emissions. Therefore, the monitoring method proposed by the present invention can be applied to the measurement of carbon dioxide gas flow rate in any period of time, thereby improving the measurement accuracy of carbon dioxide emissions.

Description

Technical Field

[0001] The present invention belongs to the field of carbon emission monitoring, and relates to a carbon emission monitoring method and system based on single-measurement-point flow velocity measurement. Background Art

[0002] Accurate measurement of carbon dioxide emissions requires the use of an online carbon dioxide emissions monitoring device, which calculates carbon dioxide emissions by measuring parameters such as the flow rate of flue gas in the pipeline and the carbon dioxide concentration.

[0003] The online monitoring device for carbon dioxide emissions usually selects a point in the pipeline to arrange the measuring probe to obtain the measurement data of flue gas related parameters. However, the distribution of flue gas velocity in the same pipe section in the flue gas emission pipeline is uneven. Using only a single point measurement result as the reference data for calculation will cause a large error in the measurement and affect the accuracy of the measurement result. In response to this situation, the existing measures are mostly to select multiple measurement points in the same measurement section of the pipeline within a certain period of time, use the reference method to obtain the measurement results of flue gas velocity at different points and take the average as the average flow rate of the flue gas in the cross section, and then compare it with the flue gas velocity at the measurement point to obtain the velocity field coefficient of the flue gas velocity at the measurement point to correct the measurement data of the flue gas velocity at the measurement point.

[0004] However, there are the following problems in using multiple measuring points to calculate the average flue gas flow rate: first, the solution of the velocity field coefficient depends largely on the selection of the locations of the multiple measuring points, which affects the accuracy of the measurement results. Secondly, the measurement of flow rate is related to many factors. The reference method usually only measures the flue gas data over a period of time, and it cannot represent that the flue gas parameter measurement of the entire process meets the requirements. In addition, the measurement cost issue also needs to be considered when using the reference method for measurement. Summary of the invention

[0005] The purpose of the present invention is to solve the problem in the prior art that the carbon emissions obtained by using multiple measuring points or a single measuring point have low accuracy and cannot be applied to flow velocity measurement in any period of time, and to provide a carbon emissions monitoring method and system based on single measuring point flow velocity measurement.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention proposes a carbon emission monitoring method based on single-point flow velocity measurement, comprising the following steps:

[0008] According to the flue gas velocity, temperature and pressure at the measuring point in the pipeline, the fitting relationship between the average flow velocity of the flue gas on the measuring point plane and the flue gas velocity, temperature and pressure at the measuring point is obtained;

[0009] The instantaneous flue gas flow rate of the cross section is obtained according to the fitting relationship and the cross-sectional area of ​​the pipeline, and the instantaneous flue gas flow rate of the cross section is converted into the instantaneous flue gas flow rate under standard conditions;

[0010] According to the instantaneous flue gas flow rate under standard conditions, the total flue gas flow rate emission flowing through the pipeline is obtained;

[0011] According to the total flue gas flow emission and carbon dioxide mass concentration flowing through the pipeline, the total carbon dioxide emission flowing through the pipeline is obtained to realize the monitoring of carbon emissions.

[0012] Preferably, the average flue gas velocity V at the measuring point plane is m The fitting relationship with the flue gas velocity, temperature and pressure at the measuring point is as follows:

[0013] V m =f(V d , T d , P d ) (1)

[0014] Among them, V d is the flue gas velocity at the measuring point, in m / s; T d is the flue gas temperature at the measuring point, in °C; P d It is the flue gas pressure at the measuring point, unit is Pa.

[0015] Preferably, the instantaneous flow rate Q of the cross-sectional smoke is obtained s The method is as follows:

[0016] Q s =V ms ·A (2)

[0017] Among them, V ms is the instantaneous average flow velocity of the cross-section smoke, in m / s, and the instantaneous average flow velocity of the cross-section smoke V ms is the average flow velocity V of the flue gas at the measuring point m The specific value at a certain moment; A is the cross-sectional area, unit is m 2 .

[0018] Preferably, the instantaneous flow rate Q of the cross-sectional smoke is s Converted into the instantaneous flow rate Q of flue gas under standard conditions b Here’s how:

[0019]

[0020] Among them, p d is the flue gas pressure at the measuring point at that moment, in Pa, and t is the flue gas temperature, in ℃.

[0021] Preferably, the total amount of flue gas flow Q flowing through the pipeline is obtained z as follows:

[0022]

[0023] Among them, Q b is the instantaneous flow rate of flue gas under standard conditions, in m 3 .

[0024] Preferably, the total amount of carbon dioxide emissions flowing through the pipeline G is obtained z The method is as follows:

[0025] G z =Q z ·C·10 -6 (5)

[0026] Where C is the mass concentration of carbon dioxide, in g / m 3 , Q z is the total amount of flue gas flow through the pipe, in m 3 .

[0027] The present invention proposes a carbon emission monitoring system based on single-point flow velocity measurement, comprising:

[0028] A model building module, wherein the model building module is used to obtain a fitting relationship between an average flow velocity of flue gas on a plane of a measuring point and a flow velocity, temperature and pressure of flue gas at the measuring point in the pipeline;

[0029] An instantaneous flow acquisition module, which is used to obtain the instantaneous flow of smoke in a cross section according to the fitting relationship and the cross-sectional area of ​​the pipeline, and convert the instantaneous flow of smoke in the cross section into the instantaneous flow of smoke under standard conditions;

[0030] A flow emission total amount acquisition module, the flow emission total amount acquisition module is used to obtain the total flow emission amount of flue gas flowing through the pipeline according to the instantaneous flow of flue gas under standard conditions;

[0031] The carbon emission total amount acquisition module is used to obtain the total amount of carbon dioxide emissions flowing through the pipeline according to the total amount of flue gas flow emissions flowing through the pipeline and the mass concentration of carbon dioxide, so as to realize the monitoring of carbon emissions.

[0032] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of a carbon emission monitoring method based on single-measurement-point flow velocity measurement when executing the computer program.

[0033] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of a carbon emission monitoring method based on single-point flow velocity measurement.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The present invention proposes a carbon emission monitoring method based on single-point velocity measurement. The distribution of flue gas in the pipeline is obtained by calculating the relevant parameters of the flue gas in the pipeline, and multiple groups of data are fitted according to the flue gas velocity at the measuring point and the flue gas velocity of the measuring cross section under different conditions to realize the calculation of the average cross-sectional flue gas velocity under single-point measurement, thereby improving the accuracy of flue gas velocity measurement and saving operation and maintenance workload. On the basis of the fitting relationship, the instantaneous flow rate of the flue gas under standard conditions is obtained according to the instantaneous flow rate of the cross-sectional flue gas, in order to obtain more accurate flue gas flow information. Finally, according to the instantaneous flow rate of the flue gas under standard conditions, the total amount of flue gas flow emissions flowing through the pipeline and the mass concentration of carbon dioxide, the total amount of carbon dioxide emissions flowing through the pipeline is obtained to realize accurate monitoring of carbon emissions. Therefore, the monitoring method proposed by the present invention can be applied to the measurement of flow velocity at any time period, which greatly improves the accuracy of carbon dioxide emission measurement.

[0036] The present invention proposes a carbon emission monitoring system based on single-point velocity measurement, which realizes carbon emission monitoring by dividing the system into a model building module, an instantaneous flow acquisition module, a flow emission total acquisition module and a carbon emission total acquisition module. The modular concept is adopted to make each module independent of each other, which is convenient for unified management of each module. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 This is a flow chart of the carbon emission monitoring method based on single-measurement-point flow velocity measurement of the present invention.

[0039] Figure 2 This is a diagram of a carbon emission monitoring system based on single-measurement-point flow velocity measurement according to the present invention. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0043] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0044] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0045] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0047] The present invention proposes a carbon emission monitoring method based on single-point velocity measurement, which includes the calculation of the flue gas velocity at the measuring point and the average flue gas velocity at the measuring plane, the calculation of the flue gas flow rate, and the calculation of the total carbon dioxide emission. Figure 1 As shown, the following steps are included:

[0048] S1. According to the flue gas velocity, temperature and pressure at the measuring point in the pipeline, obtain the fitting relationship between the average flow velocity of the flue gas on the measuring point plane and the flue gas velocity, temperature and pressure at the measuring point;

[0049] S2. Obtain the instantaneous flow rate of smoke in the cross section according to the fitting relationship and the cross-sectional area of ​​the pipeline, and convert the instantaneous flow rate of smoke in the cross section into the instantaneous flow rate of smoke under standard conditions;

[0050] S3. Obtain the total amount of flue gas flow rate discharged through the pipeline according to the instantaneous flue gas flow rate under standard conditions;

[0051] S4. According to the total flue gas flow emission and carbon dioxide mass concentration flowing through the pipeline, the total carbon dioxide emission flowing through the pipeline is obtained to realize the monitoring of carbon emissions.

[0052] Specific:

[0053] Step 1: Based on the basic principles of fluid mechanics and the laws of physical conservation, we can calculate the spatial distribution of various basic physical quantities in the complex flow field and their changes over time. We can build a calculable fluid mechanics model based on the actual situation on site and obtain the spatial distribution of various physical quantities.

[0054] Step 2: Set the initial flow velocity V, initial temperature T, and initial pressure P at the flue gas duct inlet. After the three are determined, the flow velocity distribution in the internal space of the duct can be determined. According to the distribution of the flue gas flow velocity, a suitable duct plane is selected as the measurement plane, and a point is selected on the plane as the measurement point position of the carbon emission online monitoring device measurement probe. The flue gas flow velocity at the measurement point is recorded as V. d1 , temperature is T d1 , pressure is P d1 , and calculate the average flue gas velocity of the cross section as V m1 At this time, a set of corresponding data (V m1 , V d1 , T d1 , P d1 ).

[0055] Step 3: Change the values ​​of the flue gas duct inlet velocity V, temperature T, and pressure P respectively, ensure that the position of the measuring point in step 2 remains unchanged, and record the average flue gas velocity V on the measuring point plane after the change m And the flue gas velocity V at the corresponding measuring point d , Temperature T d , pressure P d At this time, we can get the corresponding data of multiple groups of average flue gas velocity in the measurement section and the flue gas velocity, temperature and pressure at the measurement point (V m , V d , T d, P d ).

[0056] Step 4: Perform multi-parameter fitting on the multiple sets of recorded data to obtain the fitting formula of the average flue gas flow velocity in the cross section corresponding to the flue gas flow velocity, temperature and pressure at a single measuring point, which is the following formula:

[0057] V m =f(V d , T d , P d ) (1)

[0058] Among them, V m V is the average flue gas velocity in the measurement section, in m / s; d is the flue gas velocity at the measuring point, in m / s; T d is the flue gas temperature at the measuring point, in °C; P d It is the flue gas pressure at the measuring point, unit is Pa.

[0059] Step 5: After obtaining the fitting formula of the average flue gas flow velocity of the cross section corresponding to the flue gas flow velocity, temperature and pressure at a single measuring point, the instantaneous average flue gas flow velocity V of the cross section at different times can be obtained based on the flue gas flow velocity, temperature and pressure data at the measuring point at different times. ms , and the instantaneous flue gas flow rate of the cross section can be calculated as follows:

[0060] Q s =V ms ·A (2)

[0061] Among them, Q s is the instantaneous flue gas flow rate of the cross section, in m 3 / s; V ms is the instantaneous average flow rate of smoke in the cross section, in m / s, and the instantaneous average flow rate of smoke in the cross section V ms is the average flue gas velocity V in the measurement section m The specific value at a certain moment; A is the cross-sectional area, unit is m 2 ;

[0062] The instantaneous flue gas flow rate Q s Converted into the instantaneous flow rate Q of flue gas under standard conditions b :

[0063]

[0064] Among them, Q b is the instantaneous flow rate of flue gas under standard conditions, in m 3 ;p d is the flue gas pressure at the measuring point at that moment, in Pa; t is the flue gas temperature, in ℃.

[0065] Step 6: The instantaneous flow rate Q of flue gas under standard conditions b By integrating the whole process over time, the total flue gas flow rate Q of the whole process can be obtained. z :

[0066]

[0067] Where: Q z is the total flue gas emission flow rate of the whole process, in m 3 .

[0068] Step 7: According to the measured carbon dioxide emission concentration in the gas, the total carbon dioxide emission can be obtained:

[0069] G z =Q z ·C·10 -6 (5)

[0070] Among them, G z is the total mass of carbon dioxide emitted during the whole process, in t; C is the mass concentration of carbon dioxide, in g / m 3 .

[0071] Example:

[0072] Step 1: Taking a pipeline with a diameter of 1m and a length of 10m as an example, a computable fluid mechanics model is built based on the actual situation of the pipeline to obtain the spatial distribution of its various physical quantities.

[0073] Step 2: Set the initial flow velocity V = 1m / s, initial temperature T = 50℃, and initial pressure P = 101325Pa at the inlet of the flue gas duct. After the three are determined, the distribution of flue gas velocity in the internal space of the duct can be determined. According to the distribution of flue gas velocity, a point 3m away from the top of the duct is selected as the duct measurement section. A point 30cm away from the duct wall on the measurement section is selected as the measurement point for the carbon emission online monitoring device measurement probe. The flue gas velocity V at the measurement point is calculated. d1 =1.03m / s, temperature T d1 =49.91℃, pressure P d1 =101325.04Pa and the average flue gas velocity in the cross section is V m1 =1m / s, then we can get a set of corresponding data of the average flue gas flow velocity in the cross section and the flue gas flow velocity, temperature and pressure at the measuring point (1, 1.03, 49.91, 101325.04).

[0074] Step 3: Change the values ​​of the flue gas duct inlet velocity V, temperature T, and pressure P multiple times to ensure that the position of the measuring point in step 2 remains unchanged, and record the average flue gas velocity V on the plane of the measuring point after the change. m And the flue gas velocity V at the corresponding measuring pointd , Temperature T d , pressure P d At this time, we can get the average flow rate V of multiple groups of flue gas m Corresponding to the flue gas velocity V at the measuring point d , Temperature T d , pressure P d The value (V m 、V d , T d , P d ).

[0075] The calculation results should cover all possible ranges of the parameters, taking the average flue gas velocity V m For example, its data should at least cover the range of 0m / s to 20m / s. Table 1 shows the data correspondence between the average flue gas velocity of the measurement section and the flue gas velocity, temperature, and pressure at the measurement point after changing the parameters at the flue gas duct inlet:

[0076] Table 1 Corresponding data of average flue gas velocity in the cross section and flue gas velocity, temperature and pressure at the measuring point

[0077]

[0078]

[0079] Step 4: Perform multi-parameter fitting on the multiple sets of data recorded in Table 1 to obtain the fitting formula for the average cross-sectional flue gas flow velocity corresponding to the flue gas flow velocity, temperature, and pressure at a single measuring point:

[0080]

[0081] Among them, V m V is the average flue gas velocity in the measurement section, in m / s; d is the flue gas velocity at the measuring point, in m / s; T d is the flue gas temperature at the measuring point, in °C; P d It is the flue gas pressure at the measuring point, unit is Pa.

[0082] Step 5: After obtaining the fitting formula of the average flue gas flow velocity of the cross section corresponding to the flue gas flow velocity, temperature and pressure at a single measuring point, the flue gas flow velocity V at different measuring points at different times is calculated. ds , Temperature T ds , pressure P d The data can be used to obtain the average flue gas velocity V at different times. ms , and the instantaneous flue gas flow rate of the cross section can be calculated as follows:

[0083]

[0084] Among them, Qs is the instantaneous flow rate of flue gas in the cross section, in m 3 / s; V ms is the instantaneous average flow velocity of the flue gas in the cross section, in m / s; V ds is the instantaneous flow rate of smoke at the measuring point, in m / s; T ds is the instantaneous temperature of flue gas at the measuring point, in °C; P ds is the instantaneous pressure of flue gas at the measuring point, in Pa; A is the cross-sectional area, in m 2 .

[0085] Convert the instantaneous flue gas flow rate into the instantaneous flue gas flow rate Q under standard conditions b :

[0086]

[0087] Step 6: Accumulate the time integral of the entire process of flue gas instantaneous flow rate to obtain the total flue gas flow emission Q of the entire process z :

[0088]

[0089] Step 7: The measured carbon dioxide emission mass concentration in the gas is 2.95g / m 3 , we can get the total carbon dioxide emissions:

[0090] G z =Q z ·C·10 -6 =2.95×10 -6 Q z

[0091] Among them, G z is the total mass of carbon dioxide emitted during the whole process, in t; C is the mass concentration of carbon dioxide, in g / m 3 .

[0092] The present invention proposes a carbon emission monitoring system based on single-point flow velocity measurement, such as Figure 2 As shown, it includes a model building module, an instantaneous flow acquisition module, a flow emission total amount acquisition module and a carbon emission total amount acquisition module;

[0093] The model building module is used to obtain the fitting relationship between the average flue gas flow velocity at the measuring point plane and the flue gas flow velocity, temperature and pressure at the measuring point according to the flue gas flow velocity, temperature and pressure at the measuring point in the pipeline;

[0094] The instantaneous flow acquisition module is used to obtain the instantaneous flow of smoke in the cross section according to the fitting relationship and the cross-sectional area of ​​the pipeline, and convert the instantaneous flow of smoke in the cross section into the instantaneous flow of smoke under standard conditions;

[0095] The total flow emission acquisition module is used to acquire the total flow emission of flue gas flowing through the pipeline according to the instantaneous flow of flue gas under standard conditions;

[0096] The total carbon emission acquisition module is used to acquire the total carbon dioxide emission flowing through the pipeline according to the total flue gas flow emission and carbon dioxide mass concentration flowing through the pipeline, so as to realize the monitoring of carbon emission.

[0097] A terminal device provided in one embodiment of the present invention comprises: a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps in the above-mentioned method embodiments are implemented. Alternatively, when the processor executes the computer program, the functions of the modules / units in the above-mentioned device embodiments are implemented.

[0098] The computer program may be divided into one or more modules / units, and the one or more modules / units are stored in the memory and executed by the processor to accomplish the present invention.

[0099] The terminal device may be a computing device such as a desktop computer, a notebook, a PDA, a cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0100] The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0101] The memory may be used to store the computer program and / or module, and the processor implements various functions of the terminal device by running or executing the computer program and / or module stored in the memory and calling the data stored in the memory.

[0102] If the module / unit integrated in the terminal device is implemented in the form of 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 present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0103] The present invention proposes a carbon emission monitoring method and system based on single-point velocity measurement. The method and system calculate the relevant parameters of the flue gas in the pipeline to obtain the distribution of the flue gas in the pipeline, and fit multiple groups of data based on the flue gas velocity at the measuring point and the flue gas velocity of the measuring cross section under different conditions to achieve the calculation of the average cross-sectional flue gas velocity under single-point measurement, thereby improving the accuracy of velocity measurement and saving operation and maintenance workload. The method has the advantages of simple operation, low cost and can be used in a variety of situations. It can be applied to the measurement of flue gas velocity at any time period, which greatly improves the measurement accuracy of the online monitoring device for carbon dioxide emissions.

[0104] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A carbon emission monitoring method based on single-point flow velocity measurement, characterized in that: The steps include: According to the flue gas velocity, temperature and pressure at the measuring point in the pipeline, the fitting relationship between the average velocity of flue gas on the measuring point plane and the flue gas velocity, temperature and pressure at the measuring point is obtained; The instantaneous flue gas flow rate of the cross section is obtained according to the fitting relationship and the cross-sectional area of ​​the pipeline, and the instantaneous flue gas flow rate of the cross section is converted into the instantaneous flue gas flow rate under standard conditions; According to the instantaneous flue gas flow rate under standard conditions, the total flue gas flow rate emission flowing through the pipeline is obtained; According to the total flue gas flow rate and carbon dioxide mass concentration flowing through the pipeline, the total carbon dioxide emission flowing through the pipeline is obtained to realize the monitoring of carbon emissions; Average flue gas velocity V on the plane of the measuring point m The fitting relationship with the flue gas velocity, temperature and pressure at the measuring point is as follows: V m =f(V d 、T d 、P d ) (1) Get the instantaneous flow rate Q of the cross-sectional smoke s The method is as follows: Q s =V ms ·A (2) The instantaneous flow rate Q of the cross section flue gas s Converted into the instantaneous flow rate Q of flue gas under standard conditions b Here’s how: Get the total flue gas flow Q flowing through the pipeline z as follows: Get the total amount of carbon dioxide emissions G flowing through the pipeline z The method is as follows: G z =Q z ·C·10 -6 (5) Among them, V d is the flue gas velocity at the measuring point, in m / s; T d is the flue gas temperature at the measuring point, in °C; P d is the flue gas pressure at the measuring point, in Pa; V ms is the instantaneous average flow velocity of the flue gas in the cross section, in m / s, and the instantaneous average flow velocity of the flue gas in the cross section V ms is the average flow velocity V of the flue gas at the measuring point m The specific value at a certain moment; A is the cross-sectional area, unit is m 2 ;p d is the flue gas pressure at the measuring point at that moment, in Pa, t is the flue gas temperature, in °C; Q b is the instantaneous flow rate of flue gas under standard conditions, in m 3 ; C is the mass concentration of carbon dioxide, in g / m 3 , Q z is the total amount of flue gas flow through the pipe, in m 3 .

2. A carbon emission monitoring system based on single-point flow velocity measurement, characterized in that: The carbon emission monitoring method based on single-point flow velocity measurement according to claim 1 comprises: A model building module, wherein the model building module is used to obtain a fitting relationship between an average flow velocity of flue gas on a plane of a measuring point and a flow velocity, temperature and pressure of flue gas at the measuring point in the pipeline; An instantaneous flow acquisition module, which is used to obtain the instantaneous flow of smoke in a cross section according to the fitting relationship and the cross-sectional area of ​​the pipeline, and convert the instantaneous flow of smoke in the cross section into the instantaneous flow of smoke under standard conditions; A flow emission total amount acquisition module, the flow emission total amount acquisition module is used to obtain the total flow emission amount of flue gas flowing through the pipeline according to the instantaneous flow of flue gas under standard conditions; The carbon emission total amount acquisition module is used to obtain the total amount of carbon dioxide emissions flowing through the pipeline according to the total amount of flue gas flow emissions flowing through the pipeline and the mass concentration of carbon dioxide, so as to realize the monitoring of carbon emissions.

3. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the carbon emission monitoring method based on single-point flow velocity measurement as claimed in claim 1 are implemented.

4. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the carbon emission monitoring method based on single-point flow velocity measurement as claimed in claim 1 are implemented.

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