A carbon dioxide emissions monitoring device based on a fuel system and an accuracy evaluation method

Abstract

The present invention discloses a carbon dioxide emissions monitoring device and an accuracy evaluation method based on a fuel system. The flue gas discharge port is connected to a flue gas cooling system, and the cooling system is used to cool the generated flue gas to facilitate subsequent measurement. The outlet of the cooling system is connected to a flue gas discharge system. The flue gas discharge system consists of pipes with diameters of 10 cm, 30 cm, and 50 cm in sequence. The pipes with diameters of 10 cm, 30 cm, and 50 cm are for increasing the measurement accuracy. According to the requirements of the regulations, corresponding measuring point positions are selected to set up parameter measurement sections as the installation positions of the carbon dioxide emissions monitoring device. After that, the flue gas is discharged into the atmosphere after the relevant harmful gases are treated by the flue gas treatment system. This evaluation method improves the overall measurement accuracy while reducing the cost of accuracy evaluation. The overall accuracy evaluation system built can also be used for the measurement accuracy evaluation of other gas monitoring devices in the future, and has wide applicability and practicability.

Description

Technical Field

[0001] The present invention belongs to the field of carbon dioxide emissions monitoring, and relates to a carbon dioxide emissions monitoring device based on a fuel system and an accuracy evaluation method. Background Art

[0002] With the development of industrialization, the emissions of carbon dioxide have been increasing year by year, posing a serious threat to the ecological environment. Therefore, it is necessary to accurately measure the carbon dioxide emissions.

[0003] When measuring the carbon dioxide emissions of an enterprise, the direct monitoring method realizes the direct measurement of the relevant parameters of the flue gas by installing a carbon dioxide emissions monitoring device on the flue gas discharge pipeline of the enterprise, and calculates the total carbon dioxide emissions in the flue gas flowing through the pipeline based on this. At this time, the accuracy of the carbon dioxide emissions measurement will largely depend on the accuracy of the emissions monitoring device itself. Therefore, before on-site application, the accuracy of its carbon dioxide measurement should be determined first.

[0004] Currently, the accuracy determination of carbon dioxide emissions monitoring devices usually adopts the method of separately determining the accuracy of each measurement module to determine the overall measurement accuracy of the device. The determination of the accuracy of each module mostly adopts the reference method. At the same time period, the CO2 concentration, flue gas flow rate, flue gas temperature, and flue gas pressure in the flue gas are measured respectively, and the accuracy of the CO2 concentration, flue gas flow rate, flue gas temperature, and flue gas pressure is calculated respectively. This evaluation method has the disadvantage of complex evaluation content. At the same time, since the accuracy of each module is evaluated separately, and the carbon dioxide emissions monitoring device in actual operation works as a whole, there is a lack of a device and method for evaluating the overall accuracy of the carbon dioxide emissions monitoring device. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem that the existing monitoring devices in the prior art cannot determine the overall accuracy of the device, resulting in inaccurate measurement when obtaining carbon dioxide emissions, and to provide a carbon dioxide emissions monitoring device based on a fuel system and an accuracy evaluation method.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A carbon dioxide emissions monitoring device based on a fuel system proposed by the present invention includes a first pipeline, a second pipeline, and a third pipeline connected to the outlet of the cooling system;

[0008] The first pipeline, the second pipeline, and the third pipeline are connected in sequence, and the pipeline diameters of the first pipeline, the second pipeline, and the third pipeline are not equal; monitoring structures are installed on the first pipeline, the second pipeline, and the third pipeline; the monitoring structure includes a concentration measurement module, a flue gas flow velocity measurement module, a flue gas temperature measurement module, a flue gas pressure test module, and a data processing module, and the output ports of the concentration measurement module, the flue gas flow velocity measurement module, the flue gas temperature measurement module, and the flue gas pressure test module are all connected to the data processing module.

[0009] Preferably, the diameter of the first pipeline is 10 cm; the diameter of the second pipeline is 30 cm; the diameter of the third pipeline is 50 cm.

[0010] Preferably, the first pipeline is connected to the second pipeline through a reducer, and the second pipeline is connected to the third pipeline through a reducer.

[0011] A method for evaluating the accuracy of a carbon dioxide emission monitoring device based on a fuel system proposed by the present invention includes the following steps:

[0012] Obtain the carbon dioxide volume concentration, flue gas flow velocity, flue gas temperature, and flue gas pressure of the three pipelines;

[0013] Obtain the total flue gas flow rate passing through according to the flue gas flow velocity, and obtain the carbon dioxide mass concentration according to the carbon dioxide volume concentration;

[0014] Obtain the standard condition flue gas flow rate under standard conditions according to the total flue gas flow rate passing through, the flue gas temperature, and the flue gas pressure;

[0015] Obtain the total carbon dioxide emission amount according to the standard condition flue gas flow rate and the carbon dioxide mass concentration in the flue gas, compare the total carbon dioxide emission amounts of the three pipelines, and realize the accuracy evaluation of the total carbon dioxide emission amount.

[0016] Preferably, the calculation method for obtaining the total flue gas flow rate passing through according to the flue gas flow velocity is as follows:

[0017]

[0018]

[0019]

[0020] Among them, Q z1 is the total flue gas flow rate passing through the first pipeline, with the unit of m 3 ; Q z2 is the total flue gas flow rate passing through the second pipeline, with the unit of m 3 ; Q z3is the total flue gas flow rate passing through the third pipeline, with the unit of m 3 ; v1 is the average flow velocity data of the measurement section at different times in the pipeline with the first pipeline diameter, with the unit of m / s; v2 is the average flow velocity data of the measurement section at different times in the pipeline with the second pipeline diameter, with the unit of m / s; v3 is the average flow velocity data of the measurement section at different times in the pipeline with the third pipeline diameter, with the unit of m / s.

[0021] Preferably, the method for obtaining the standard condition flow rate of flue gas according to the total flue gas flow rate, flue gas temperature, and flue gas pressure is as follows:

[0022]

[0023]

[0024]

[0025] Among them, Q b1 is the total flow rate passing through the first pipeline under standard conditions during the whole process, with the unit of m 3 ; Q b2 is the total flow rate passing through the second pipeline under standard conditions during the whole process, with the unit of m 3 ; Q b3 is the total flow rate passing through the third pipeline under standard conditions during the whole process, with the unit of m 3 ; t is the flue gas temperature, with the unit of °C; p is the flue gas pressure, with the unit of Pa;

[0026] The total flue gas flow rates passing through the pipelines with different diameters of the first pipeline, the second pipeline, and the third pipeline under standard conditions satisfy the following conditions:

[0027] Q b1 = Q b2 = Q b3 (7).

[0028] Preferably, the method for obtaining the carbon dioxide mass concentration according to the carbon dioxide volume concentration is as follows:

[0029]

[0030]

[0031]

[0032] Among them, C z1 is the carbon dioxide mass concentration in the first pipeline, with the unit of g / m 3 ; C z2 is the carbon dioxide mass concentration in the second pipeline, with the unit of g / m 3 ; C z3 is the carbon dioxide mass concentration in the third pipeline, with the unit of g / m3 ; C t1 is the volume concentration of carbon dioxide in the first pipeline, in %; C t2 is the volume concentration of carbon dioxide in the second pipeline, in %; C t3 is the volume concentration of carbon dioxide in the third pipeline, in %;

[0033] The mass concentrations of carbon dioxide flowing through the different-diameter pipelines of the first, second, and third pipelines satisfy the following conditions:

[0034] C z1 = C z2 = C z3 (11).

[0035] Preferably, according to the standard condition flow rate of the flue gas and the mass concentration of carbon dioxide in the flue gas, the method for obtaining the total carbon dioxide emission is as follows:

[0036] M1 = M2 = M3 (12)

[0037] where M1 is the total measured carbon dioxide emission in the first pipeline, M1 = C z1 Q b1 × 10 -6 , in unit t; M2 is the total measured carbon dioxide emission in the second pipeline, M2 = C z2 Q b2 × 10 -6 , in unit t; M3 is the total measured carbon dioxide emission in the third pipeline, M3 = C z3 Q b3 × 10 -6 , in unit t.

[0038] Preferably, the method for comparing the total carbon dioxide emissions of the three pipelines and evaluating the accuracy of the total carbon dioxide emissions is as follows:

[0039] If 0 ≤ α ≤ 2%, the measurement accuracy of the measured carbon dioxide emission monitoring device is good;

[0040] If 2% ≤ α ≤ 5%, the measurement accuracy of the measured carbon dioxide emission monitoring device is qualified;

[0041] If α > 5%, the measurement accuracy of the measured carbon dioxide emission monitoring device is unqualified;

[0042] Among them, α is the maximum value among α1, α2, and α3, α = max{α1, α2, α3}, α1 is the measurement deviation value of the carbon dioxide emission measurement value on the second pipeline compared to the carbon dioxide emission measurement value on the first pipeline, α2 is the measurement deviation value of the carbon dioxide emission measurement value on the third pipeline compared to the carbon dioxide emission measurement value on the first pipeline; α3 is the measurement deviation value of the carbon dioxide emission measurement value on the third pipeline compared to the carbon dioxide emission measurement value on the second pipeline.

[0043] Preferably, the calculation methods of the measurement deviation value α1 of the carbon dioxide emission measurement value on the second pipeline compared to the carbon dioxide emission measurement value on the first pipeline, the measurement deviation value α2 of the carbon dioxide emission measurement value on the third pipeline compared to the carbon dioxide emission measurement value on the first pipeline, and the measurement deviation value α3 of the carbon dioxide emission measurement value on the third pipeline compared to the carbon dioxide emission measurement value on the second pipeline are as follows:

[0044]

[0045]

[0046]

[0047] Compared with the prior art, the present invention has the following beneficial effects:

[0048] A carbon dioxide emission monitoring device based on a fuel system proposed by the present invention connects the outlet of the cooling system to the first pipeline, the second pipeline, and the third pipeline in sequence, and the diameters of the first pipeline, the second pipeline, and the third pipeline are different, aiming to compare the measurement accuracy of the monitoring device. Then, according to the actual situation, four measurement modules are installed at the corresponding measurement points of the first pipeline, the second pipeline, and the third pipeline, and corresponding data can be collected when the cooling system discharges the product into the three pipelines. The collected data is transmitted to the data processing module, and the total carbon dioxide emission flowing through each pipeline can be obtained. By comparing the magnitudes of the total carbon dioxide emissions of each pipeline, the measurement accuracy evaluation of the monitoring device can be realized. Since the measurement accuracy of carbon dioxide emissions depends to a large extent on the accuracy of the emission monitoring device itself, therefore, on the premise of knowing that the monitoring device has good measurement accuracy, the obtained carbon dioxide emissions can be accurately measured.

[0049] An accuracy evaluation method for a carbon dioxide emission monitoring device based on a fuel system proposed by the present invention collects relevant data through four measurement modules, and then performs corresponding data processing, and realizes accurate evaluation by comparing whether the total carbon dioxide emissions flowing through the three pipelines are equal. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0051] Figure 1 It is a structural diagram of the carbon dioxide emissions monitoring device based on the fuel system of the present invention.

[0052] Figure 2 It is a flowchart of the accuracy evaluation method for the carbon dioxide emissions monitoring device based on the fuel system of the present invention.

[0053] Wherein: 1 - First pipeline, 2 - Second pipeline, 3 - Third pipeline, 9 - Cooling pipeline, 10 - Cooling system. Specific embodiments

[0054] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. 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.

[0055] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0056] It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0057] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship when the product of the invention is usually placed. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 of the present invention. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0058] In addition, when the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and it does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0059] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, when the terms "set", "installed", "connected", and "connected" appear, they 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 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 situations.

[0060] The present invention will be further described in detail below with reference to the accompanying drawings:

[0061] A carbon dioxide emissions monitoring device based on a fuel system proposed by the present invention, as Figure 1 shown, a flue gas cooling system 10 is connected to the output port of the fuel combustion system. A cooling pipe 9 is connected to the output port of the flue gas cooling system 10. The other end of the cooling pipe 9 is successively connected to a first pipe 1, a second pipe 2, and a third pipe 3. The pipe diameters of the first pipe 1, the second pipe 2, and the third pipe 3 are not equal. The main function of the fuel combustion system is to generate flue gas containing carbon dioxide. The system needs to include a fuel combustion boiler, and the boiler is equipped with a blower to increase the initial flow rate of the flue gas and improve the fuel combustion efficiency. The boiler system needs to include a fuel feeding port, an ash and slag collection port, and a flue gas discharge port. The fuel feeding port is used for feeding fuel, and the ash and slag collection port is used for collecting the ash and slag generated after combustion for component detection in the laboratory for further subsequent test calculation verification. Standard gas or other gases can also be used in the flue gas combustion system to directly generate flue gas. The flue gas discharge port is connected to the flue gas cooling system, and the cooling system is used to cool the generated flue gas for convenient subsequent measurement. Monitoring structures 4 for obtaining carbon dioxide parameters are installed on the first pipe 1, the second pipe 2, and the third pipe 3. The monitoring structure 4 includes a concentration measurement module, a flue gas flow rate measurement module, a flue gas temperature measurement module, a flue gas pressure test module, and a data processing module. The output ports of the concentration measurement module, the flue gas flow rate measurement module, the flue gas temperature measurement module, and the flue gas pressure test module are all connected to the data receiving module. After the data processing module receives the data, it can process the data accordingly to determine the measurement accuracy of the monitoring device.

[0062] Among them, the diameter of the first pipe 1 is 10 cm; the diameter of the second pipe 2 is 30 cm; the diameter of the third pipe 3 is 50 cm. The first pipe 1 is connected to the second pipe 2 through a reducer, and the second pipe 2 is connected to the third pipe 3 through a reducer.

[0063] An accuracy evaluation method for a carbon dioxide emissions monitoring device based on a fuel system proposed by the present invention, as Figure 2 shown, includes the following steps:

[0064] S1. Obtain the carbon dioxide volume concentration, flue gas flow rate, flue gas temperature, and flue gas pressure of the three pipes;

[0065] S2. Obtain the total flue gas flow rate passing through according to the flue gas flow rate, and obtain the carbon dioxide mass concentration according to the carbon dioxide volume concentration;

[0066] The method for obtaining the total flue gas flow rate passing through according to the flue gas flow rate is as follows:

[0067]

[0068]

[0069]

[0070] Among them, Q z1 is the total flue gas flow rate passing through the first pipe 1, with the unit of m 3 ; Q z2 is the total flue gas flow rate passing through the second pipe 2, with the unit of m 3 ; Q z3 is the total flue gas flow rate passing through the third pipe 3, with the unit of m 3 ; v1 is the average flow velocity data of the measurement cross-section at different times of the pipe with the diameter of the first pipe 1, with the unit of m / s; v2 is the average flow velocity data of the measurement cross-section at different times of the pipe with the diameter of the second pipe 2, with the unit of m / s; v3 is the average flow velocity data of the measurement cross-section at different times of the pipe with the diameter of the third pipe 3, with the unit of m / s.

[0071] The method for obtaining the carbon dioxide mass concentration according to the carbon dioxide volume concentration is as follows:

[0072]

[0073]

[0074]

[0075] Among them, C z1 is the carbon dioxide mass concentration in the first pipe 1, with the unit of g / m 3 ; C z2is the mass concentration of carbon dioxide in the second pipeline 2, with the unit of g / m 3 ; C z3 is the mass concentration of carbon dioxide in the third pipeline 3, with the unit of g / m 3 ; C t1 is the volume concentration of carbon dioxide in the first pipeline 1, with the unit of %; C t2 is the volume concentration of carbon dioxide in the second pipeline 2, with the unit of %; C t3 is the volume concentration of carbon dioxide in the third pipeline 3, with the unit of %.

[0076] The mass concentration of carbon dioxide flowing through the pipelines with different diameters of the first pipeline 1, the second pipeline 2 and the third pipeline 3 satisfies the following conditions:

[0077] C z1 = C z2 = C z3 (11).

[0078] S3. Obtain the standard condition flow rate of the flue gas under standard conditions according to the total flow rate, temperature and pressure of the flue gas passing through;

[0079] The total flow rate of the flue gas flowing through the pipelines with different diameters of the first pipeline 1, the second pipeline 2 and the third pipeline 3 under standard conditions satisfies the following conditions:

[0080] Q b1 = Q b2 = Q b3 (4).

[0081] The method for obtaining the standard condition flow rate of the flue gas under standard conditions according to the total flow rate, temperature and pressure of the flue gas passing through is as follows:

[0082]

[0083]

[0084]

[0085] Among them, Q b1 is the total flow rate passed through by the first pipeline 1 during the whole process under standard conditions, with the unit of m 3 ; Q b2 is the total flow rate passed through by the second pipeline 2 during the whole process under standard conditions, with the unit of m 3 ; Q b3 is the total flow rate passed through by the third pipeline 3 during the whole process under standard conditions, with the unit of m 3 ; t is the flue gas temperature, with the unit of °C; p is the flue gas pressure, with the unit of Pa.

[0086] S4. Obtain the total carbon dioxide emissions based on the standard condition flow rate of the flue gas and the mass concentration of carbon dioxide in the flue gas, compare the total carbon dioxide emissions of the three pipelines, and achieve the accuracy assessment of the total carbon dioxide emissions.

[0087] The method for obtaining the total carbon dioxide emissions based on the standard condition flow rate of the flue gas and the mass concentration of carbon dioxide in the flue gas is as follows:

[0088] M1 = M2 = M3 (12)

[0089] Wherein, M1 is the total carbon dioxide emissions measured in the first pipeline 1, M1 = C z1 Q b1 × 10 -6 , with the unit of t; M2 is the total carbon dioxide emissions measured in the second pipeline 2, M2 = C z2 Q b2 × 10 -6 , with the unit of t; M3 is the total carbon dioxide emissions measured in the third pipeline 3, M3 = C z3 Q b3 × 10 -6 , with the unit of t.

[0090] The method for comparing the total carbon dioxide emissions of the three pipelines and achieving the accuracy assessment of the total carbon dioxide emissions is as follows:

[0091] If 0 ≤ α ≤ 2%, the measurement accuracy of the carbon dioxide emissions monitoring device is good;

[0092] If 2% ≤ α ≤ 5%, the measurement accuracy of the carbon dioxide emissions monitoring device is qualified;

[0093] If α > 5%, the measurement accuracy of the carbon dioxide emissions monitoring device is unqualified;

[0094] Wherein, α is the maximum value among α1, α2, and α3, α = max{α1, α2, α3}, α1 is the measurement deviation value of the carbon dioxide emissions measurement value on the second pipeline 2 compared to the carbon dioxide emissions measurement value on the first pipeline 1, α2 is the measurement deviation value of the carbon dioxide emissions measurement value on the third pipeline 3 compared to the carbon dioxide emissions measurement value on the first pipeline 1; α3 is the measurement deviation value of the carbon dioxide emissions measurement value on the third pipeline 3 compared to the carbon dioxide emissions measurement value on the second pipeline 2.

[0095] The calculation methods for the measurement deviation values α1 of the carbon dioxide emission measurement values on the second pipeline 2 compared with those on the first pipeline 1, α2 of the carbon dioxide emission measurement values on the third pipeline 3 compared with those on the first pipeline 1, and α3 of the carbon dioxide emission measurement values on the third pipeline 3 compared with those on the second pipeline 2 are as follows:

[0096]

[0097]

[0098]

[0099] Specifically:

[0100] Step 1: Install carbon dioxide emission monitoring devices on the measurement sections of the 10-cm diameter pipeline, 30-cm diameter pipeline, and 50-cm diameter pipeline respectively. The monitoring devices include a concentration measurement module, a flue gas flow velocity measurement module, a flue gas temperature measurement module, and a flue gas pressure test module.

[0101] Step 2: Put fuels such as coal into the fuel combustion system to generate flue gas containing carbon dioxide.

[0102] Step 3: After the flue gas is cooled in the cooling section, it flows through the 10-cm diameter pipeline, 30-cm diameter pipeline, and 50-cm diameter pipeline respectively. The flue gas-related parameters measured by the carbon dioxide emission monitoring device mainly include the CO2 concentration in the flue gas, as well as the flue gas flow velocity, flue gas temperature, and flue gas pressure parameters. Record the total gas flow Q monitored by the carbon dioxide emission monitoring device on different pipe diameters during the stage from the generation of the flue gas to the complete discharge of the flue gas from the pipeline. z1 、Q z2 、Q z3 And after passing through the flue gas treatment system, it is discharged into the atmosphere.

[0103] Q z1 is the total flue gas flow passing through the 10-cm diameter pipeline during the whole process, with the unit of m 3 ; Q z2 is the total flue gas flow passing through the 30-cm diameter pipeline during the whole process, with the unit of m 3 ; Q z3 is the total flue gas flow passing through the 50-cm diameter pipeline during the whole process, with the unit of m 3 ; Q z1 、Q z2 、Q z3 The calculations of respectively satisfy the following formulas:

[0104]

[0105]

[0106]

[0107] Among them, v1 is the average flow velocity data of the measurement cross-section at different times in the 10-cm diameter pipeline, with the unit of m / s; v2 is the average flow velocity data of the measurement cross-section at different times in the 30-cm diameter pipeline, with the unit of m / s; v3 is the average flow velocity data of the measurement cross-section at different times in the 50-cm diameter pipeline, with the unit of m / s.

[0108] The total flow rate is converted to the standard condition flue gas flow rate as follows:

[0109]

[0110]

[0111]

[0112] Among them, Q b1 is the total flow rate passing through the 10-cm diameter pipeline under standard conditions, with the unit of m 3 ; Q b2 is the total flow rate passing through the 30-cm diameter pipeline under standard conditions, with the unit of m 3 ; Q b3 is the total flow rate passing through the 50-cm diameter pipeline under standard conditions, with the unit of m 3 ; t is the flue gas temperature, with the unit of °C; p is the flue gas pressure, with the unit of Pa.

[0113] The total flow rate converted to standard conditions flowing through three pipelines with different diameters should meet the condition:

[0114] Q b1 = Q b2 = Q b3 (7)

[0115] The volume concentration of carbon dioxide measured in the pipeline is converted to the mass concentration as:

[0116]

[0117]

[0118]

[0119] Among them, C z1 is the mass concentration of carbon dioxide in the 10-cm diameter pipeline, with the unit of g / m 3 ; C z2 is the mass concentration of carbon dioxide in the 30-cm diameter pipeline, with the unit of g / m3 ; C z3 is the mass concentration of carbon dioxide in a 50-cm diameter pipeline, with the unit of g / m 3 ; C t1 is the volume concentration of carbon dioxide in a 10-cm diameter pipeline, with the unit of %; C t2 is the volume concentration of carbon dioxide in a 30-cm diameter pipeline, with the unit of %; C t3 is the volume concentration of carbon dioxide in a 50-cm diameter pipeline, with the unit of %.

[0120] Since the same gas flows through each pipeline in sequence, the measured mass concentrations of carbon dioxide are basically the same, that is, it satisfies:

[0121] C z1 = C z2 = C z3 (11)

[0122] Then the total carbon dioxide emissions monitored by the on-line carbon emission monitoring device should satisfy:

[0123] M1 = M2 = M3 (12)

[0124] M1 = C z1 Q b1 × 10 -6 (13)

[0125] M2 = C z2 Q b2 × 10 -6 (14)

[0126] M3 = C z3 Q b3 × 10 -6 (15)

[0127] Among them, M1 is the total carbon dioxide emissions measured in the 10-cm diameter pipeline, with the unit of t; M2 is the total carbon dioxide emissions measured in the 30-cm diameter pipeline, with the unit of t; M3 is the total carbon dioxide emissions measured in the 50-cm diameter pipeline, with the unit of t.

[0128] That is, the theoretical measured carbon dioxide emissions of each pipeline should satisfy the equal condition.

[0129] Step 4: Compare the monitoring data of the carbon dioxide emissions monitoring devices installed on three different pipe diameters to see if the results are consistent. If the results are consistent or the differences are small, it is considered that the overall measurement accuracy of the developed carbon dioxide emissions monitoring device is good.

[0130] The goodness of accuracy can be determined by measuring the deviation values. Calculate the measurement deviation values α1, α2 of the carbon dioxide emission measurement values M2, M3 on the 30-cm pipeline and the 50-cm pipeline compared to the carbon dioxide emission measurement value M1 on the 10-cm pipeline, and the measurement deviation value α3 of the carbon dioxide emission measurement value M3 on the 50-cm pipeline compared to the carbon dioxide emission measurement value M2 on the 30-cm pipeline as follows:

[0131]

[0132]

[0133]

[0134] α = max{α1, α2, α3} (19)

[0135] Among them, α1 is the measurement deviation value of the carbon dioxide emission measurement value on the 30-cm pipeline compared to the carbon dioxide emission measurement value on the 10-cm pipeline, with the unit of %;

[0136] α2 is the measurement deviation value of the carbon dioxide emission measurement value on the 50-cm pipeline compared to the carbon dioxide emission measurement value on the 10-cm pipeline, with the unit of %;

[0137] α3 is the non-measurement deviation value of the carbon dioxide emission measurement value on the 50-cm pipeline compared to the carbon dioxide emission measurement value on the 30-cm pipeline, with the unit of %;

[0138] α is the maximum value among α1, α2, and α3.

[0139] If 0 ≤ α ≤ 2%, it can be considered that the measurement accuracy of the measured carbon dioxide emission monitoring device is good;

[0140] If 2% ≤ α ≤ 5%, it can be considered that the measurement accuracy of the measured carbon dioxide emission monitoring device is qualified;

[0141] If α > 5%, it can be considered that the measurement accuracy of the measured carbon dioxide emission monitoring device is unqualified and needs to be improved.

[0142] Example:

[0143] Step 1: Install carbon dioxide emission monitoring devices on the measurement sections of the 10-cm diameter pipeline, the 30-cm diameter pipeline, and the 50-cm diameter pipeline respectively.

[0144] Step 2: Put fuels such as coal into the fuel combustion system to generate flue gas containing carbon dioxide.

[0145] Step 3: After the flue gas is condensed in the cooling section, its temperature decreases. The cooled flue gas flows through pipes with diameters of 10 cm, 30 cm, and 50 cm respectively. The generation time of the flue gas is 10 min. The total carbon dioxide emissions recorded by different on-line carbon dioxide emission monitoring devices within 10 min are 0.95 kg, 0.98 kg, and 0.99 kg respectively.

[0146] Step 4: Compare the monitoring data of the three carbon emission on-line monitoring devices and calculate their measurement inaccuracies as follows:

[0147]

[0148]

[0149]

[0150] α = max{3.16%, 4.21%, 1.02%} = 4.21%

[0151] Since 2% ≤ α ≤ 5%, it can be considered that the measurement accuracy of this on-line carbon dioxide emission monitoring device is qualified.

[0152] Therefore, a carbon dioxide emissions monitoring device and an accuracy evaluation method based on a fuel system proposed by the present invention. The main function of the fuel combustion system is to generate flue gas containing carbon dioxide. The system needs to include a fuel combustion boiler, which is equipped with a blower to increase the initial flow rate of the flue gas and improve the fuel combustion efficiency. The boiler system should include a fuel feeding port, an ash and slag collection port, and a flue gas discharge port. The fuel feeding port is used to feed fuel, and the ash and slag collection port is used to collect the ash and slag generated after combustion for component detection in the laboratory for further subsequent test calculation verification. In the flue gas combustion system, standard gas or other gases can also be used to directly generate flue gas. The flue gas discharge port is connected to the flue gas cooling system, which is used to cool the generated flue gas for subsequent measurement. The outlet of the cooling system is connected to the flue gas discharge system. The flue gas discharge system is successively a 10-cm diameter pipe, a 10-cm - 30-cm reducer, a 30-cm diameter pipe, a 30-cm - 50-cm reducer, and a 50-cm diameter pipe. The 10-cm diameter pipe, 30-cm diameter pipe, and 50-cm diameter pipe are for increasing the measurement accuracy. According to the requirements of the regulations, corresponding measuring point positions are selected to set up parameter measurement sections as the installation positions of the carbon dioxide emissions monitoring device. Then, after the flue gas is treated by the flue gas treatment system to remove relevant harmful gases, it is discharged into the atmosphere. The overall measurement accuracy determination of the existing carbon dioxide emissions monitoring device mainly uses the method of separately evaluating the accuracy of each parameter module of the device. The evaluation process is cumbersome and the evaluation cost is relatively high. The method provided by this method reduces the accuracy evaluation cost while evaluating its overall measurement accuracy. The accuracy evaluation method can also be used for the measurement accuracy evaluation of other gas monitoring devices in the future, with wide applicability and practicability.

[0153] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An accuracy evaluation method for a carbon dioxide emissions monitoring device based on a fuel system, characterized in that, The carbon dioxide emissions monitoring device based on the fuel system includes a first pipeline (1), a second pipeline (2), and a third pipeline (3) connected to the outlet of the cooling system; the first pipeline (1), the second pipeline (2), and the third pipeline (3) are connected in sequence, and the pipeline diameters of the first pipeline (1), the second pipeline (2), and the third pipeline (3) are not equal; monitoring structures (4) are installed on the first pipeline (1), the second pipeline (2), and the third pipeline (3); the monitoring structure (4) includes a concentration measurement module, a flue gas flow velocity measurement module, a flue gas temperature measurement module, a flue gas pressure test module, and a data processing module, and the output ports of the concentration measurement module, the flue gas flow velocity measurement module, the flue gas temperature measurement module, and the flue gas pressure test module are all connected to the data processing module; the diameter of the first pipeline (1) is 10 cm; the diameter of the second pipeline (2) is 30 cm; the diameter of the third pipeline (3) is 50 cm; the first pipeline (1) is connected to the second pipeline (2) through a reducer, and the second pipeline (2) is connected to the third pipeline (3) through a reducer; The evaluation method includes the following steps: Obtain the carbon dioxide volume concentration, flue gas flow velocity, flue gas temperature, and flue gas pressure of the three pipelines; Obtain the total flue gas flow rate passing through according to the flue gas flow velocity, and obtain the carbon dioxide mass concentration according to the carbon dioxide volume concentration; Obtain the standard condition flow rate of the flue gas under standard conditions according to the total flue gas flow rate passing through, the flue gas temperature, and the flue gas pressure; Obtain the total carbon dioxide emission amount according to the standard condition flow rate of the flue gas and the carbon dioxide mass concentration in the flue gas, compare the total carbon dioxide emission amounts of the three pipelines, and realize the accuracy evaluation of the total carbon dioxide emission amount; The method for comparing the total carbon dioxide emission amounts of the three pipelines and realizing the accuracy evaluation of the total carbon dioxide emission amount is as follows: If , the measurement accuracy of the measured carbon dioxide emission monitoring device is good; If , then the measurement accuracy of the measured carbon dioxide emissions monitoring device is qualified; If , the measurement accuracy of the measured carbon dioxide emissions monitoring device is unqualified; Among them, is , , the maximum value among, , is the measurement deviation value of the carbon dioxide emission measurement value on the second pipeline (2) compared to the carbon dioxide emission measurement value on the first pipeline (1), is the measurement deviation value of the carbon dioxide emission measurement value on the third pipeline (3) compared to the carbon dioxide emission measurement value on the first pipeline (1); is the measurement deviation value of the carbon dioxide emission measurement value on the third pipeline (3) compared to the carbon dioxide emission measurement value on the second pipeline (2); The measurement deviation value of the carbon dioxide emission measurement on the second pipeline (2) compared to the carbon dioxide emission measurement on the first pipeline (1) , the measurement deviation value of the carbon dioxide emission measurement on the third pipeline (3) compared to the carbon dioxide emission measurement on the first pipeline (1) and the measurement deviation value of the carbon dioxide emission measurement on the third pipeline (3) compared to the carbon dioxide emission measurement on the second pipeline (2) are calculated as follows: Among them, is the total carbon dioxide emissions measured in the first pipeline (1), , unit: t; is the total carbon dioxide emissions measured in the second pipeline (2), , unit: t; is the total carbon dioxide emissions measured in the third pipeline (3), , unit: t; is the carbon dioxide mass concentration in the first pipeline (1), unit: g / m 3 ; is the carbon dioxide mass concentration in the second pipeline (2), unit: g / m 3 ; is the carbon dioxide mass concentration in the third pipeline (3), unit: g / m 3 ; is the total flow rate passed through by the first pipeline (1) under standard conditions during the whole process, unit: m 3 ; is the total flow rate passed through by the second pipeline (2) under standard conditions during the whole process, unit: m 3 ; is the total flow rate passed through by the third pipeline (3) under standard conditions during the whole process, unit: m 3 .

2. The evaluation method according to claim 1, characterized in that, The calculation method for obtaining the total flue gas flow rate passing through according to the flue gas flow velocity is as follows: Among them, is the total flue gas flow rate passing through the first duct (1), with the unit of m 3 ; is the total flue gas flow rate passing through the second duct (2), with the unit of m 3 ; is the total flue gas flow rate passing through the third duct (3), with the unit of m 3 ; is the average flow velocity data of the measurement section of the first duct (1) at different times, with the unit of m / s; is the average flow velocity data of the measurement section of the second duct (2) at different times, with the unit of m / s; is the average flow velocity data of the measurement section of the third duct (3) at different times, with the unit of m / s.

3. The evaluation method according to claim 2, characterized in that, The method for obtaining the standard condition flow rate of the flue gas under standard conditions according to the total flue gas flow rate passing through, the flue gas temperature, and the flue gas pressure is as follows: where t is the flue gas temperature, unit ; is the flue gas pressure, unit Pa; The total flue gas flow rates of the flue gas flowing through the pipelines with different diameters of the first pipeline (1), the second pipeline (2), and the third pipeline (3) under standard conditions satisfy the following conditions:

4. The evaluation method according to claim 3, characterized in that, The method for obtaining the carbon dioxide mass concentration according to the carbon dioxide volume concentration is as follows: Among them, is the volume concentration of carbon dioxide in the first pipeline (1), in %; is the volume concentration of carbon dioxide in the second pipeline (2), in %; is the volume concentration of carbon dioxide in the third pipeline (3), in %; The carbon dioxide mass concentrations of the flue gas flowing through the pipelines with different diameters of the first pipeline (1), the second pipeline (2), and the third pipeline (3) satisfy the following conditions:

5. The evaluation method according to claim 4, characterized in that, The method for obtaining the total carbon dioxide emission amount according to the standard condition flow rate of the flue gas and the carbon dioxide mass concentration in the flue gas is as follows:

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