Flue gas carbon dioxide emission metering system and thermal power generating unit

Abstract

The invention provides a flue gas carbon dioxide emission metering system and a thermal power generating unit, and belongs to the technical field of carbon emission monitoring. The system comprises a flow velocity detection mechanism arranged on a flue and used for measuring the flow velocity of flue gas at different positions in the flue and obtaining the average flow velocity of the flue gas based on the flow velocity of the flue gas at multiple different positions; the sampling mechanism is arranged on the flue and is used for collecting flue gas samples at different positions in the flue and forming mixed samples; the concentration measuring mechanism is connected with the sampling mechanism and is used for measuring the carbon dioxide concentration based on the mixed sample as the carbon dioxide concentration of the flue gas in the flue; and the metering server is connected with the flow velocity detection mechanism and the concentration measurement mechanism, and is used for calculating the carbon dioxide emission amount based on the average flow velocity of the flue gas and the carbon dioxide concentration. The carbon dioxide emission is calculated by collecting the flue gas flow velocity and the carbon dioxide concentration at different positions, the system structure is simple, and the calculation result of the carbon dioxide emission is more accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon emission monitoring, and particularly to a flue gas carbon dioxide emission metering system and a thermal power unit. Background Art

[0002] Currently, the carbon dioxide emissions in the flue gas of thermal power units mainly adopt the emission factor method and the online monitoring method. The emission factor method for coal-fired power plants mainly uses the product of the input coal quantity and the emission factor as the estimated value of carbon emissions. However, the carbon emission factor is greatly uncertain due to the influence of technical level, production status, energy utilization, and process. With the gradual improvement of the continuous monitoring technology system, the continuous monitoring method will become an important carbon emission metering method. In the existing online monitoring method, the carbon dioxide concentration measurement generally uses a CEMS instrument, which is based on the non-dispersive infrared measurement technology combined with the cold and dry sampling method. However, this method has a complex pretreatment process, easy pollution of the lens, large maintenance volume, long measurement process time, and requires humidity calculation.

[0003] Moreover, the commonly used solutions in the prior art include a carbon dioxide measurement device, a temperature, pressure, and humidity meter, a flow rate measurement meter, and a calculation system; the carbon dioxide device includes a sampling unit, a heat tracing sampling pipe, a condensation unit, and a measurement unit. The sampling unit of the carbon dioxide device, the temperature, pressure, and humidity meter, and the flow rate measurement meter are installed on the flue, and the condensation unit and the measurement unit of the carbon dioxide device are installed in the on-site CEMS cubicle. The sampling unit and the condensation unit in the cubicle are heated at a high temperature throughout by the heat tracing sampling pipe. The carbon dioxide concentration measured by the carbon dioxide measurement device, the temperature, pressure, and humidity measured by the temperature, pressure, and humidity meter, and the flow rate value measured by the flow rate measurement meter are all uploaded to the calculation system for operation.

[0004] However, in the above solution, the sampling pipe samples at a certain position in the flue gas, which cannot represent the average concentration of the flue gas in the whole cross-section; the carbon dioxide concentration measured by the cold drying method is the concentration in the dry basis state, while the flow rate is the data in the wet basis state. The humidity parameter needs to be introduced in the carbon emission metering process, resulting in the introduction of humidity error. This device is generally installed at the total discharge port or the chimney outlet, where the humidity is high, which will cause the filter element of the sampling pipe to be blocked and the maintenance period to be short. The flow velocity meter based on the differential pressure method measures the flow velocity at a single point, and when the flue gas flow velocity is lower than 5 m / s, the measurement is inaccurate, resulting in poor accuracy of carbon emission metering. Summary of the Invention

[0005] The purpose of the embodiments of the present invention is to provide a flue gas carbon dioxide emission metering system and a thermal power unit to solve the problem of poor accuracy of carbon emission metering by using the current carbon emission calculation method and system.

[0006] To achieve the above purpose, the embodiments of the present invention provide a flue gas carbon dioxide emission metering system, and the system includes: A flow velocity detection mechanism is arranged on the flue duct, used for measuring the flue gas flow velocities at different positions in the flue duct, and obtaining the average flue gas flow velocity in the flue duct based on the flue gas flow velocities at multiple different positions; A sampling mechanism is arranged on the flue duct, used for collecting flue gas samples at different positions in the flue duct and forming a mixed sample; A concentration measurement mechanism is connected to the sampling mechanism, used for measuring and obtaining the carbon dioxide concentration based on the mixed sample, as the carbon dioxide concentration of the flue gas in the flue duct; A metering server is connected to the flow velocity detection mechanism and the concentration measurement mechanism, used for calculating the carbon dioxide emission amount in the flue duct based on the average flue gas flow velocity and the carbon dioxide concentration.

[0007] Optionally, the flow velocity detection mechanism includes: Multiple protective sleeves arranged on the flue duct, the multiple protective sleeves are inclined relative to the axis of the flue duct and are arranged oppositely, and the intersection point of the extension lines of the multiple protective sleeves is located on the axis of the flue duct; Multiple temperature measurement sensors and multiple pressure measurement sensors, one temperature measurement sensor and one pressure measurement sensor are arranged in each protective sleeve, respectively used for measuring the flue gas temperature and the flue gas pressure at the corresponding position; A processor is connected to each temperature measurement sensor, each pressure measurement sensor and the metering server, used for calculating the flue gas flow velocity at each corresponding position based on the flue gas temperature and the flue gas pressure at each corresponding position; and calculating the average flue gas flow velocity in the flue duct based on the flue gas flow velocities at each corresponding position.

[0008] Optionally, the included angle between the extension line of the protective sleeve and the axis of the flue duct is 30 - 60 degrees.

[0009] Optionally, the sampling mechanism includes: A protective shell with a hollow interior is arranged on the flue duct, and multiple independent and sealed installation cavities are arranged inside the protective shell; Filter elements and sampling tubes, one filter element is arranged in each installation cavity, one sampling tube is arranged at the sampling end of each installation cavity, the lengths of the sampling tubes of each installation cavity are different, and the ends of the sampling tubes are distributed at different positions in the flue duct; Gas output pipelines and a mixing receiving pipe, the output end of each installation cavity is connected to the mixing receiving pipe through a gas output pipeline, and the mixing receiving pipe is used for mixing the flue gas samples output from different installation cavities to form a mixed sample.

[0010] Optionally, the concentration measurement mechanism is a concentration measuring instrument, which is connected to the mixing receiving pipe and used for measuring the carbon dioxide concentration of the mixed sample.

[0011] Optionally, a first valve is provided on each gas output pipeline to control the on / off of the gas output pipeline.

[0012] Optionally, the system further includes: A backflush mechanism, which is connected to the gas output pipeline and is used to blow air to the sampling mechanism to achieve backflushing.

[0013] Optionally, the backflush mechanism includes: An air source for providing compressed air; A backflush pipeline, and the air outlet of the air source is connected to the gas output pipeline between the corresponding first valve and the corresponding installation cavity through the backflush pipeline; A second valve, which is provided on the backflush pipeline to control the on / off of the backflush pipeline.

[0014] Optionally, the system further includes: A backflush controller, which is connected to the first valve and the second valve, and is used to, when receiving a sampling instruction input externally, achieve sampling by controlling the first valve to open and the second valve to close; and is used to, when receiving a backflush instruction input externally, achieve backflushing by controlling the second valve to open and the first valve to close.

[0015] On the other hand, an embodiment of the present invention further provides a thermal power unit, including the above-mentioned flue gas carbon dioxide emission metering system.

[0016] The system structure of this technical solution is simple. By collecting the flue gas flow rates at different positions and the carbon dioxide concentrations at different positions, the carbon dioxide emission amount is calculated, and the collected data is more accurate, which can ensure that the calculation result of the carbon dioxide emission amount is more accurate.

[0017] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent specific implementation part. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings are used to provide a further understanding of the embodiments of the present invention, and constitute a part of the specification. Together with the following specific implementation, they are used to explain the embodiments of the present invention, but do not constitute a limitation to the embodiments of the present invention. In the drawings: Figure 1 is a schematic structural diagram of the flue gas carbon dioxide emission metering system provided by the present invention; Figure 2 is a schematic structural diagram of the sampling mechanism provided by the present invention; Figure 3 is an operation control flowchart of the backflush controller provided by the present invention.

[0019] DESCRIPTION OF THE REFERENCE NUMERALS 1 - Flow velocity detection mechanism; 2 - Sampling mechanism; 3 - Concentration measurement mechanism; 4 - Metering server; 5 - Backflush mechanism; 11 - Protection sleeve; 12 - Sensor; 13 - Pressure measurement sensor; 14 - Processor 21 - Protection housing; 22 - Installation cavity; 23 - Filter element; 24 - Sampling pipe; 25 - Gas output pipeline; 26 - Mixing and containing pipe; 51 - Gas source; 52 - Backflush pipeline; 53 - Second valve; 54 - Backflush controller; 101 - Flue; 251 - First valve. Detailed implementation manners

[0020] The following details the specific implementation manners of the embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific implementation manners described herein are only for explaining and illustrating the embodiments of the present invention, and are not used to limit the embodiments of the present invention.

[0021] In the embodiments of the present invention, unless otherwise stated, the orientation terms such as "upper, lower, left, right" generally refer to the orientation or positional relationship based on the orientation shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed during use.

[0022] The terms "first", "second", "third", etc. are only used for distinguishing descriptions, and cannot be understood as indicating or implying relative importance.

[0023] The terms "parallel", "perpendicular", etc. do not mean that the components are required to be absolutely parallel or perpendicular, but can be slightly inclined. For example, "parallel" only means that its direction is more parallel relative to "perpendicular", and does not mean that the structure must be completely parallel, but can be slightly inclined.

[0024] The terms "horizontal", "vertical", "hanging", etc. do not mean that the components are required to be absolutely horizontal, vertical or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0025] In addition, terms such as "substantially", "basically", etc. are intended to indicate that the relevant content does not require absolute precision, but can have a certain deviation. For example: "substantially equal" does not only mean absolute equality. Since it is difficult to achieve absolute "equality" during actual production and operation processes, there is generally a certain deviation. Therefore, in addition to absolute equality, "substantially equal" also includes the above-mentioned situation of having a certain deviation. Taking this as an example, in other cases, unless otherwise stated, terms such as "substantially", "basically", etc. have meanings similar to the above.

[0026] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", and "linked" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Figure 1 is a schematic structural diagram of the flue gas carbon dioxide emission metering system provided by the present invention; Figure 2 is a schematic structural diagram of the sampling mechanism provided by the present invention; Figure 3 is an operation control flowchart of the backflush controller provided by the present invention.

[0028] As Figure 1 shown, this embodiment provides a flue gas carbon dioxide emission metering system, and the system includes: A flow velocity detection mechanism 1, which is arranged on the flue 101 and is used to measure the flue gas flow velocities at different positions in the flue 101, and obtain the average flue gas flow velocity in the flue 101 based on the flue gas flow velocities at multiple different positions; A sampling mechanism 2, which is arranged on the flue 101 and is used to collect flue gas samples at different positions in the flue 101 and form a mixed sample; A concentration measurement mechanism 3, which is connected to the sampling mechanism 2 and is used to measure and obtain the carbon dioxide concentration based on the mixed sample as the carbon dioxide concentration of the flue gas in the flue 101; A metering server 4, which is connected to the flow velocity detection mechanism 1 and the concentration measurement mechanism 3, and is used to calculate the carbon dioxide emission amount in the flue 101 based on the average flue gas flow velocity and the carbon dioxide concentration.

[0029] Specifically, in this embodiment, through the above solution, by collecting the flue gas flow velocities at different positions, the average flue gas flow velocity is obtained, and by collecting the carbon dioxide concentrations at different positions, the carbon dioxide concentration of the flue gas in the flue is obtained, and the carbon dioxide emission amount is calculated. Moreover, the collected data is more accurate, and without using humidity calculation, it can ensure that the calculation result of the carbon dioxide emission amount is more accurate.

[0030] Among them, calculating the carbon dioxide emission amount based on the average flue gas flow velocity and the carbon dioxide concentration is a known prior art to those skilled in the art and will not be elaborated here.

[0031] In addition, this solution provides a method for calculating the flue gas volume flow rate: First, the average wet flue gas flow velocity is calculated according to the following formula:

[0032] Among them, is the average velocity of wet flue gas at the measurement section, with the unit of meters per second (m / s); is the velocity field coefficient; is the average velocity of wet flue gas measured by the cross-section velocity CMS, with the unit of meters per second; Secondly, the wet flue gas flow rate under actual working conditions is calculated according to the following formula:

[0033] Among them, is the wet flue gas flow rate under actual working conditions, with the unit of cubic meters per hour; is the area of the measurement section, with the unit of square meters; Secondly, the dry flue gas volume flow rate under standard conditions is calculated according to the following formula:

[0034] Among them, is the dry flue gas volume flow rate under standard conditions, with the unit of cubic meters per hour; is the flue gas temperature, with the unit of degrees Celsius; is the atmospheric pressure, with the unit of Pascal; is the static pressure of the flue gas (gauge pressure), with the unit of Pascal; Secondly, the carbon dioxide emission mass flow rate is calculated according to the following formula:

[0035] Among them, is the carbon dioxide emission mass flow rate of the flue gas, with the unit of tons per hour; Finally, the cumulative carbon dioxide emissions are calculated according to the following formula:

[0036]

[0037]

[0038] is the daily carbon dioxide emissions, with the unit of tons per day: is the carbon dioxide emissions in the i-th hour of the day, with the unit of tons per hour; is the monthly carbon dioxide emissions, with the unit of tons per month; is the carbon dioxide emissions on the i-th day of the month, with the unit of tons per day; is the annual carbon dioxide emissions, with the unit of tons per year; is the carbon dioxide emissions on the i-th day of the year, with the unit of tons per day; is the number of days in the month; is the number of days in that year.

[0039] Further, the flow velocity detection mechanism 1 includes: A plurality of protection sleeves 11 arranged on the flue 101, the plurality of protection sleeves 11 being inclined relative to the axis of the flue 101 and arranged oppositely, and the intersection point of the extension lines of the plurality of protection sleeves 11 being located on the axis of the flue 101; A plurality of temperature measurement sensors 12 and a plurality of pressure measurement sensors 13, with one temperature measurement sensor 12 and one pressure measurement sensor 13 arranged in each protection sleeve 11, respectively used for measuring the flue gas temperature and flue gas pressure at the corresponding position; A processor 14, connected to each temperature measurement sensor 12, each pressure measurement sensor 13 and the metering server 4, for calculating the flue gas flow velocity at each corresponding position based on the flue gas temperature and flue gas pressure at each corresponding position; and calculating the average flue gas flow velocity in the flue 101 based on the flue gas flow velocities at each corresponding position.

[0040] Specifically, in this embodiment, the protection sleeve 11 has an inclined opening structure and is installed flush with the inner wall of the flue 101.

[0041] Preferably, the temperature measurement sensor 12 and the pressure measurement sensor 13 are integrated on a transducer probe, and then the transducer probe is installed inside the protection sleeve 11.

[0042] Preferably, four protection sleeves 11 are provided and arranged in a square structure in the vertical direction. Each protection sleeve 11 is inclinedly arranged on the flue 101, and the intersection point of the extension lines of the protection sleeves 11 is located on the axis of the flue 101.

[0043] Further, the included angle between the extension line of the protection sleeve 11 and the vertical axis of the flue 101 is 30 - 60 degrees.

[0044] Specifically, in this embodiment, adopting this arrangement method can improve the accuracy of flue gas flow velocity measurement.

[0045] Further, the sampling mechanism 2 includes: A protection housing 21 with a hollow interior, arranged on the flue 101, and a plurality of independent and sealed installation cavities 22 are arranged inside the protection housing 21; Filter elements 23 and sampling tubes 24, with one filter element 23 arranged in each installation cavity 22, and one sampling tube 24 arranged at the sampling end of each installation cavity 22. The lengths of the sampling tubes 24 in each installation cavity 22 are different, and the end parts of the sampling tubes 24 are distributed at different positions of the flue 101; The gas output pipe 25 and the mixing and containing pipe 26 , the output end of each installation cavity 22 is connected to the mixing and containing pipe 26 via the gas output pipe 25 , and the mixing and containing pipe 26 is used to mix the smoke samples output from different installation cavities 22 to form a mixed sample.

[0046] Specifically, in this embodiment, in order to improve the accuracy of carbon dioxide concentration measurement and avoid the measurement error caused by single-point measurement, the flue gas at different positions in the flue 101 is sampled through the sampling tube 24, and then the collected flue gas samples are transported to the mixing tube 26 through the installation cavity 22 and the gas output pipe 25 for mixing, and then the concentration is measured by the concentration measuring mechanism 3 arranged at the end of the mixing tube 26, which can greatly improve the accuracy of the measurement; in addition, since the flue gas contains impurities such as dust, a filter element 23 is arranged in the installation cavity 22 for filtering to reduce the leakage of dust, and at the same time, the concentration measuring mechanism 3 is protected. In order to protect the installation cavity 22 and the sampling tube 24, a hollow protective shell 21 is provided, and the installation cavity 22 is integrated in the protective shell 21. At the same time, the end of the sampling tube 24 passes through the protective shell 21 to form an integrated structure to achieve protection and rapid installation of the device. Each installation cavity 22 is independently arranged and can be disassembled and replaced separately to reduce the cost of use.

[0047] Preferably, the protective shell 21 is set to a T-shaped structure, and a mounting hole is opened at a corresponding position of the flue 101, and the small end of the T-shaped protective shell 21 is inserted into the mounting hole, so that the step surface of the T-shaped protective shell 21 contacts the outer wall of the flue 101 to achieve stable installation. In addition, in order to ensure the scientific nature of sampling, the sampling port (end) of the sampling tube 24 is arranged in a standard grid distribution in the flue, and the length of the sampling tube 24 is calculated based on the equivalent diameter of the flue cross section combined with the standard grid sampling method.

[0048] In another embodiment, the sampling mechanism 2 comprises: A protective shell 21 with a hollow interior is arranged on the flue 101. A plurality of independent and sealed installation cavities 22 are arranged inside the protective shell 21. A filter element 23 is arranged in each installation cavity 22. A valve is arranged at the air inlet end of the installation cavity 22 and the valve is controlled so that gas only enters one of the filter elements 23 during sampling, thereby realizing the filter element 23 working in turn, extending the operation and maintenance cycle of the filter element, and solving the problem of short maintenance cycle. The output end of the installation cavity 22 is connected to a mixing containing tube 26 through a gas output pipe 25. The mixing containing tube 26 is used to mix the flue gas samples output from different installation cavities 22 to form a mixed sample.

[0049] Furthermore, the concentration measuring mechanism 3 is a concentration measuring instrument connected to the mixing and containing tube 26 for measuring the carbon dioxide concentration of the mixed sample.

[0050] Specifically, since the flue gas entering the sampling pipe 24 is the flue gas at different positions in the flue duct 101, a mixing and accommodating pipe 26 is provided so that the flue gas output from the sampling pipe 24 is mixed inside the sampling pipe 24 and then the concentration measurement is carried out to ensure the accuracy of the concentration data collection.

[0051] More specifically, the concentration measurement mechanism 3 includes a measurement gas chamber and an optical component.

[0052] Among them, the carbon dioxide concentration is calculated by using the following calculation formula:

[0053] Among them, is the mass concentration of carbon dioxide under standard conditions, with the unit of grams per cubic meter; is the volume concentration of carbon dioxide measured by the CO 2 -CEMS, with the unit of volume percentage; the dry and wet basis states of the mass concentration and volume concentration in the formula are the same.

[0054] The conversion between the dry basis mass concentration and wet basis mass concentration of carbon dioxide under standard conditions is as follows according to the formula:

[0055] Among them, is the dry basis mass concentration of carbon dioxide under standard conditions, with the unit of grams per cubic meter; is the wet basis mass concentration of carbon dioxide under standard conditions, with the unit of grams per cubic meter; is the moisture content of the flue gas.

[0056] Furthermore, a first valve 251 is provided on each gas output pipe 25 for controlling the on-off of the gas output pipe 25.

[0057] Specifically, since the flue gas in the flue duct has a certain pressure, the flue gas in the flue duct will be discharged outward from the on-off of the gas output pipe 25. Therefore, a first valve 251 needs to be provided on the gas output pipe 25 for controlling the on-off of the gas output pipe 25. When sampling is required, the first valve 251 is opened, and the flue gas flows along the pipe into the mixing and accommodating pipe 26, and after mixing, the concentration measurement is realized; when the sampling is completed, the first valve 251 is controlled to close, which can avoid more flue gas from leaking outward to reduce pollution.

[0058] Furthermore, the system further includes: A backwashing mechanism 5, which is connected to the gas output pipe 25 and is used to blow air to the sampling mechanism 2 to achieve backwashing.

[0059] Specifically, since there is a certain amount of dust in the flue gas, during the long-term use of the sampling mechanism 2, a certain amount of dust will accumulate, resulting in blockage and inability to achieve normal sampling. Therefore, a backflush mechanism 5 is correspondingly provided to blow air to the sampling mechanism 2 for backflushing to ensure normal sampling and extend the service life of the device.

[0060] Further, the backflush mechanism 5 includes: An air source 51 for providing compressed air; A backflush pipeline 52, and the air outlet of the air source 51 is connected to the gas output pipeline 25 between the corresponding first valve 251 and the corresponding installation cavity 22 through the backflush pipeline 52; A second valve 53 provided on the backflush pipeline 52 for controlling the on / off of the backflush pipeline 52.

[0061] Specifically, in this embodiment, the air source 51 for providing compressed gas can be a compressed gas cylinder or an instrument air source. The air outlet of the air source 51 is connected to the corresponding gas output pipelines 25 through multiple backflush pipelines 52, and the connection positions are between the first valve 251 and the installation cavity 22. During backflushing, closing the first valve 251 can prevent the backflush gas from moving to the concentration measurement mechanism 3 and causing equipment damage; at the same time, a second valve 53 is provided on the backflush pipeline 52 for controlling the on / off of the backflush pipeline 52 to achieve automatic control.

[0062] Further, the system further includes: A backflush controller 54 connected to the first valve 251 and the second valve 53, for when receiving an externally input sampling instruction, realizing sampling by controlling the first valve 251 to open and the second valve 53 to close; and for when receiving an externally input backflush instruction, realizing backflushing by controlling the second valve 53 to open and the first valve 251 to close.

[0063] Specifically, in this embodiment, the sampling mechanism 2 is used to collect flue gas samples at different positions in the flue 101. Therefore, during the collection process, the backflush controller 54 receives an externally input sampling instruction, controls the first valve 251 to open and the second valve 53 to close for sampling; after sampling, by inputting a backflush instruction to the backflush controller 54, the backflush controller 54 controls the second valve 53 to open and the first valve 251 to close, and the backflush mechanism 5 supplies gas for backflushing to prevent the filter element 23 from being blocked and extend the service life.

[0064] In another embodiment, the above solution can be replaced by: embedding a control program in the backflush controller 54 so that the backflush controller 54 can automatically control sample collection and backflushing at preset time intervals.

[0065] In another embodiment, the system further includes: a heating module installed in the flue, and the heating module includes a heating device and a relay.

[0066] This embodiment also provides a thermal power unit, including the above-mentioned flue gas carbon dioxide emission metering system.

[0067] The optional embodiments of the embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention.

[0068] Those skilled in the art can understand that all or part of the steps in implementing the above method embodiments can be completed by instructing relevant hardware through a program, and the program is stored in a storage medium, including several instructions to enable a single-chip microcomputer, a chip or a processor to execute all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: various media such as a USB flash drive, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disc that can store program codes.

[0069] The optional embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention. Additionally, it should be noted that in the above specific embodiments, the various specific technical features described can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not separately describe various possible combination methods. In addition, any combination can be made among the various different embodiments of the embodiments of the present invention, as long as it does not violate the idea of the embodiments of the present invention, and it should also be regarded as the content disclosed by the embodiments of the present invention.

Claims

1. A flue gas carbon dioxide emission metering system, characterized in that: The system comprises: A flow rate detection mechanism (1) is arranged on the flue (101) and is used to measure the flow rates of flue gas at different positions in the flue (101), and to obtain an average flow rate of flue gas in the flue (101) based on the flow rates of flue gas at multiple different positions; A sampling mechanism (2) is arranged on the flue (101) and is used to collect flue gas samples at different positions in the flue (101) and form a mixed sample; A concentration measuring mechanism (3) connected to the sampling mechanism (2) and used to measure the carbon dioxide concentration based on the mixed sample as the carbon dioxide concentration of the flue gas in the flue (101); The metering server (4) is connected to the flow rate detection mechanism (1) and the concentration measurement mechanism (3), and is used to calculate the carbon dioxide emission in the flue (101) based on the average flow rate of the flue gas and the carbon dioxide concentration.

2. The flue gas carbon dioxide emission metering system according to claim 1, characterized in that: The flow velocity detection mechanism (1) comprises: A plurality of protective sleeves (11) are arranged on the flue (101), the plurality of protective sleeves (11) are inclined to the axis of the flue (101) and are arranged relative to each other, and the intersection of the extension lines of the plurality of protective sleeves (11) is located on the axis of the flue (101); A plurality of temperature measurement sensors (12) and a plurality of pressure measurement sensors (13), wherein each protective sleeve (11) is provided with a temperature measurement sensor (12) and a pressure measurement sensor (13), and are used to measure the smoke temperature and the smoke pressure at corresponding positions, respectively; A processor (14) is connected to each temperature measurement sensor (12), each pressure measurement sensor (13) and the metering server (4), and is used to calculate the flue gas flow rate at each corresponding position based on the flue gas temperature and flue gas pressure at each corresponding position; and to calculate the average flue gas flow rate in the flue (101) based on the flue gas flow rate at each corresponding position.

3. The flue gas carbon dioxide emission metering system according to claim 2, characterized in that: The angle between the extension line of the protective sleeve (11) and the axis of the flue (101) is 30-60 degrees.

4. The flue gas carbon dioxide emission metering system according to claim 1, characterized in that: The sampling mechanism (2) comprises: A protective shell (21) with a hollow interior is arranged on the flue (101), wherein a plurality of mutually independent and sealed installation cavities (22) are arranged inside the protective shell (21); A filter element (23) and a sampling tube (24), wherein each installation cavity (22) is provided with a filter element (23), and a sampling tube (24) is provided at a sampling end of each installation cavity (22), the sampling tubes of each installation cavity (22) have different lengths, and ends of the sampling tubes (24) are distributed at different positions of the flue (101); A gas output pipe (25) and a mixing and containing pipe (26), wherein the output end of each installation cavity (22) is connected to the mixing and containing pipe (26) via the gas output pipe (25), and the mixing and containing pipe (26) is used to mix the smoke samples output from different installation cavities (22) to form a mixed sample.

5. The flue gas carbon dioxide emission metering system according to claim 4, characterized in that: The concentration measuring mechanism (3) is a concentration measuring instrument, which is connected to the mixing and containing tube (26) and is used to measure the carbon dioxide concentration of the mixed sample.

6. The flue gas carbon dioxide emission metering system according to claim 4, characterized in that: Each gas output pipeline (25) is provided with a first valve (251) for controlling the on-off of the gas output pipeline (25).

7. The flue gas carbon dioxide emission metering system according to claim 6, characterized in that: The system further comprises: A back-blowing mechanism (5), the back-blowing mechanism (5) being connected to the gas output pipeline (25) and being used for blowing gas toward the sampling mechanism (2) to achieve back-blowing.

8. The flue gas carbon dioxide emission metering system according to claim 7, characterized in that: The backflush mechanism (5) comprises: A gas source (51) for providing compressed gas; A backflush pipeline (52), wherein the gas outlet of the gas source (51) is connected to a gas output pipeline (25) between the corresponding first valve (251) and the corresponding installation cavity (22) via the backflush pipeline (52); The second valve (53) is arranged on the backflush pipeline (52) and is used to control the opening and closing of the backflush pipeline (52).

9. The flue gas carbon dioxide emission metering system according to claim 8, characterized in that: The system further comprises: A backflush controller (54) is connected to the first valve (251) and the second valve (53), and is used to control the first valve (251) to open and the second valve (53) to close to achieve sampling when receiving a sampling instruction input from the outside; and is used to control the second valve (53) to open and the first valve (251) to close to achieve backflush when receiving a backflush instruction input from the outside.

10. A thermal power unit, characterized in that: A flue gas carbon dioxide emission metering system comprising the flue gas carbon dioxide emission metering system according to any one of claims 1 to 9.

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