Quality control device and particulate matter online monitoring system

Abstract

The utility model relates to a quality control device and a particulate matter on-line monitoring system. The quality control device is arranged on a main pipeline of the particulate matter on-line monitoring system. The quality control device comprises a box body and a control unit, a first bypass, a filter and a first standard flowmeter are arranged in the box body, and a first switching module is arranged outside the box body; wherein the inlet end of the first bypass is connected with the first outlet of the first switching module, and the outlet end of the first bypass is allowed to be communicated with a downstream main pipeline; the first switching module is configured to enable the upstream main pipeline to selectively communicate with the downstream main pipeline or the first bypass, and the control unit is configured to control flow path switching of the first switching module; and the filter and the first standard flowmeter are arranged in the first bypass. The method is high in automation degree, high in quality control precision and real and reliable in quality control result.

Description

Technical Field

[0001] This application belongs to the technical field of particulate matter monitoring, and more particularly to a quality control device and an on-line particulate matter monitoring system. Background Art

[0002] Currently, particulate matter monitoring products mainly include on-line β-ray particulate matter monitors, on-line inorganic element monitors, on-line organic carbon and elemental carbon monitors, black carbon monitors, etc. At the beginning of the installation of on-line monitoring products, commissioning, trial operation and acceptance are required to test and verify the performance and functions. After passing the acceptance, during the formal operation stage, quality control operations need to be regularly carried out on the on-line monitoring products. The above-mentioned performance and function tests, as well as daily quality control operations, currently mainly rely on manual operations, such as:

[0003] For the measurement and calibration of the flow rate of the above-mentioned monitors, it is necessary to manually connect a standard flow meter in series with the inlet of the monitor, manually conduct air extraction, read the readings of the standard flow meter and the flow rate of the monitor, and conduct comparison analysis and correction. In addition, the above-mentioned monitors all need to use standard thermometers and pressure gauges. Currently, the manual method is used to compare and correct the readings of the standard meter with the temperature and pressure readings of the monitor.

[0004] In addition, the above-mentioned on-line particulate matter monitors all need to carry out system blank tests, and it is necessary to manually remove the sampling cutting head at the air inlet and replace it with a high-efficiency filter; for the inorganic element monitor, in addition to the measurement and calibration of the flow rate, temperature and pressure, it is also necessary to verify the stability of the element measurement module with a metal film sample. It is necessary to manually place the metal film sample in the element measurement area when the equipment is stopped, and then manually start the manual measurement to verify the accuracy and stability of the element measurement module.

[0005] In addition, the black carbon monitor needs to regularly verify the stability of the optical module with an optical calibration film. The organic carbon and elemental carbon monitor also needs to calibrate the carrier gas flow path and conduct regular quality control. Generally, a standard flow meter is manually connected in series to the carrier gas outlet, and then each carrier gas flow path and flow rate are manually adjusted, and the readings of the standard flow meter and the monitor flow rate are compared and corrected. The organic carbon and elemental carbon monitor also needs to carry out the dissolution efficiency test. Currently, it relies on manual operation. The sampling flow path of the monitor is respectively measured with and without passing through the dissolution device, and then the dissolution efficiency is calculated, and the efficiency is low. Summary of the Utility Model

[0006] In view of the above analysis, the embodiments of the present utility model aim to provide a quality control device and an on-line particulate matter monitoring system to solve one or more of the above problems existing in the prior art.

[0007] The object of the present utility model is achieved as follows:

[0008] On the one hand, a quality control device is provided and installed on the main pipeline of the particulate matter online monitoring system; the quality control device includes a box body and a control unit. A first bypass, a filter, and a first standard flowmeter are arranged inside the box body, and a first switching module is arranged outside the box body. Wherein, the inlet end of the first bypass is connected to the first outlet of the first switching module, and the outlet end of the first bypass allows communication with the downstream main pipeline; the first switching module is configured to selectively connect the upstream main pipeline to the downstream main pipeline or the first bypass, and the control unit is configured to control the flow path switching of the first switching module; the filter and the first standard flowmeter are arranged in the first bypass.

[0009] Further, the filter and the first standard flowmeter are arranged in series in the first bypass; alternatively, the filter and the first standard flowmeter are arranged in parallel in the first bypass; the first bypass includes a first branch and a second branch arranged in parallel, the filter is arranged on the first branch, and the first standard flowmeter is arranged on the second branch; the first switching module can selectively connect the upstream main pipeline to the downstream main pipeline, the first branch or the second branch.

[0010] Further, a second switching module is arranged on the first bypass, and the second switching module is located downstream of the first switching module; the second switching module is configured to selectively connect the first outlet of the first switching module to the first branch or the second branch.

[0011] Further, the quality control device further includes a second bypass and a third switching module. The third switching module is arranged outside the box body and is configured to selectively connect the main pipeline downstream of the first switching module and the first bypass to the downstream main pipeline or the second bypass; the second bypass is arranged inside the box body, the inlet end of the second bypass is connected to the first outlet of the third switching module, and the outlet end of the second bypass is connected to the main pipeline downstream of the third switching module.

[0012] Further, the quality control device further includes a calculation unit, and the calculation unit is used to obtain the error and ratio between the output value of the first standard flowmeter and the output value of the sampling flowmeter of the system to be quality controlled. The ratio is the calibration coefficient of the sampling flowmeter, and the system to be quality controlled automatically adjusts the flow according to the calibration coefficient.

[0013] On the other hand, a particulate matter online monitoring system is further provided, which includes a main pipeline. The above-mentioned quality control device and an analyzer are arranged on the main pipeline. The first switching module of the quality control device is arranged on the main pipeline, and the outlet end of the first bypass is connected to the main pipeline downstream of the first switching module.

[0014] Further, the analyzer is a particulate matter element monitor, and the particulate matter online monitoring system further includes:

[0015] An enrichment unit, which is used to enrich and remove particulate matter in the gas in the main pipeline;

[0016] A first driving unit, which is used to move the elemental standard to the detection channel of the analyzer;

[0017] Wherein, the elemental standard includes:

[0018] A carrier plate, which has a through hole, and the thickness of the part of the carrier plate surrounding the through hole is less than that of other parts;

[0019] A standard unit, which is arranged at the through hole and includes a first membrane, a second membrane and a third membrane connected in sequence, and a variety of elements with known concentrations are attached to the second membrane.

[0020] Further, the analyzer is an organic carbon element carbon monitor, the dissolver is arranged on the main pipeline downstream of the third switching module, the inlet end of the second bypass is communicated with the third switching module upstream of the dissolver, and the outlet end of the second bypass is communicated with the main pipeline downstream of the dissolver.

[0021] Further, the analyzer is a black carbon monitor, and the quality control device further includes: a standard filter and a second driving unit, which is used to drive the standard filter so that the standard filter is located on the detection optical path of the black carbon monitor as required.

[0022] Further, the particulate matter online monitoring system further includes: a plurality of carrier gas flow paths respectively communicated with the analyzer, and a carrier gas flowmeter is arranged on each carrier gas flow path; the quality control device further includes a second standard flowmeter, which is arranged downstream of the carrier gas outlet of the analyzer.

[0023] Compared with the prior art, the quality control device and the particulate matter online monitoring system provided by the present utility model can at least achieve one of the following beneficial effects:

[0024] 1. High degree of automation: By setting the quality control device, each switching module automatically switches according to the instruction, so that the monitoring system enters various quality control states, such as flow rate test, blank test, elemental quality control, dissolver efficiency test, carrier gas test, etc., and automatically calculates the correction coefficient and dissolver efficiency without manual intervention, which can greatly save manpower and operation and maintenance quality control costs.

[0025] 2. High quality control accuracy: The quality control device can automatically perform flow calibration, system blank test, denuder efficiency test, and tests on element concentration and precision, etc., avoiding problems such as poor repeatability and airtightness affected by repeated plugging and unplugging of pipelines caused by manual operation, and greatly improving the accuracy and reliability of quality control work. Especially the automatic quality control structure for element standard substances and the automatic optical quality control structure for the black carbon monitor avoid problems such as inconsistent positions and sample contamination caused by manual placement of standard substances, improving the accuracy and stability of quality control.

[0026] 3. True and reliable quality control results: The quality control device can obtain the original quality control data. The standard meter reading is only available on the quality control device, so the quality control results can only be obtained on the quality control device. The quality control device can set external permissions, which are not open to the monitoring system manufacturer and personnel of other operation and maintenance units. Only the final quality control unit has the query permission, which can ensure the true and reliability of quality control data to the greatest extent. Brief Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the embodiments of this specification. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0028] Figure 1 Schematic structural diagram of the particulate matter online monitoring system provided for Embodiment 1;

[0029] Figure 2 Schematic structural diagram of the element standard substance provided for Embodiment 1;

[0030] Figure 3 Schematic structural diagram of the particulate matter online monitoring system for Embodiment 2;

[0031] Figure 4 Schematic structural diagram of the particulate matter online monitoring system for Embodiment 3.

[0032] Reference Signs:

[0033] 11 - Cutter; 12 - Enrichment unit; 13 - Organic carbon and elemental carbon monitor; 14 - Carrier gas flow path; 141 - Carrier gas flowmeter; 142 - Second standard flowmeter; 143 - Carrier gas outlet; 21 - First bypass; 211 - First branch; 212 - Second branch; 22 - First switching module; 23 - Filter; 24 - First standard flowmeter; 25 - Main pipeline; 26 - Second switching module; 31 - Carrier plate; 33 - Annular transition zone; 32 - Through hole; 41 - Second bypass; 42 - Third switching module; 43 - Denuder. Detailed Embodiments

[0034] The preferred embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings, in which the drawings form a part of the present invention and are used together with the embodiments of the present invention to explain the principles of the present invention, and are not used to limit the scope of the present invention.

[0035] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the term "connected" 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. 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.

[0036] The terms "top", "bottom", "above", "below", and "on" described throughout the text are relative positions with respect to the components of the device, such as the relative positions of the top and bottom substrates inside the device. It can be understood that the device is multifunctional and has nothing to do with its orientation in space.

[0037] The normal working surface of the present invention can be a plane or a curved surface, which can be inclined or horizontal. For the convenience of description, the embodiments of the present invention are placed on a horizontal plane and used on the horizontal plane, and "high and low" and "up and down" are defined accordingly.

[0038] Embodiment 1

[0039] A specific embodiment of the present utility model, as Figure 1 shown, discloses a quality control device applied to an online particulate matter monitoring system.

[0040] In this embodiment, the online particulate matter monitoring system can be abbreviated as the system to be quality-controlled, and includes a main pipeline 25 and a cutter 11, a quality control device, and an analysis device provided on the main pipeline 25. Among them, the analysis device includes an enrichment unit 12 and an analyzer. The enrichment unit 12 includes a filter membrane, a driving wheel, a driven wheel, a pump, and a sampling flowmeter. The two ends of the filter membrane are respectively wound around the driving wheel and the driven wheel. The filter membrane is used to enrich particulate matter in the gas, and its translation distance is precisely controlled by the driving wheel. Driven by the driving wheel, the filter membrane in the enrichment position moves to the detection position, and the analyzer analyzes the particulate matter enriched on the filter membrane in the detection position. The analyzer includes an X-ray source and a fluorescence detector, and the X-ray source is arranged on the upper side or the lower side of the filter membrane. For example, the analyzer in this embodiment can adopt a particulate matter element monitor.

[0041] In this embodiment, the quality control device is arranged on the main pipeline of the online particulate matter monitoring system. The quality control device includes a box body, a first switching module 22, a first bypass 21, a control unit, and a calculation unit;

[0042] Specifically, the first switching module 22 is arranged on the main pipeline 25 and is used to selectively connect the outlet of the cutter 11 to the first bypass 21 or directly connect it to the downstream main pipeline 25. Exemplarily, the first switching module 22 can adopt a three-way ball valve. A filter 23 and a first standard flowmeter 24 are provided on the first bypass 21. The control unit is used to switch the first switching module 22 according to an instruction. The calculation unit is used to calculate the difference and ratio of the output results of the first standard flowmeter 24 and the sampling flowmeter (i.e., the flow correction coefficient). The ratio is the correction coefficient of the sampling flowmeter, and the quality control system automatically adjusts the flow according to the correction coefficient.

[0043] In this embodiment, the particulate matter online monitoring system further includes a first driving unit. The first driving unit adopts a motor and is used to move the elemental standard to the detection path between the X-ray source and the filter membrane and move it out.

[0044] As Figure 2 shown, the elemental standard includes a carrier plate 31, and standard units are provided on the carrier plate 31. Specifically, the carrier plate 31 is made of a stainless steel thin sheet and has a circular through hole 32 at one end. The part of the carrier plate 31 surrounding the through hole 32 is an annular transition area 33, and the thickness of the annular transition area 33 is less than the thickness of the main body part of the carrier plate 31. The carrier plate 31 is fixed on the rotating shaft of the motor. By rotating the motor, the carrier plate 31 is placed between the X-ray source and the filter membrane or moved out. The standard unit is arranged at the through hole 32 and includes a first film, a second film, and a third film connected in sequence. The second film adopts a hydrophilic organic filter membrane, such as a polyethersulfone filter membrane, and adheres to a variety of elements with known concentrations. For example, Cr element is selected in the low-energy range, Pb element is selected in the middle-energy range, and Cd element is selected in the high-energy range. The first film and the third film adopt Mylar film or polycarbonate film and allow X-rays and fluorescence to pass through.

[0045] The preparation method of the second film adhering to the element is as follows:

[0046] Prepare the corresponding single-element standard liquid (the general medium is HCl or HNO3), take a certain volume of each solution according to a certain ratio, and mix them in a clean container, such as a watch glass;

[0047] Immerse the polyethersulfone filter membrane in the above solution until the filter membrane is completely wetted;

[0048] Take out the filter membrane, place it in a clean empty container, and dry it in a fume hood until it is completely dry.

[0049] The quality control process of the particulate matter online monitoring system in the embodiment of the present utility model is as follows:

[0050] (1) Flow rate test, specifically:

[0051] The first switching module 22 switches to the quality control state according to the instruction. Under the suction of the pump, the gas enters the main pipeline 25 after passing through the cutter 11, then enters the first bypass 21 through the first switching module 22, and returns to the main pipeline 25 after passing through the filter 23 and the first standard flowmeter 24 in sequence, and then enters the enrichment unit;

[0052] The gas passes through the pump and the sampling flowmeter;

[0053] The calculation unit calculates the error between the output values of the first standard flowmeter 24 and the sampling flowmeter;

[0054] If the error is outside the set range, the calculation unit obtains the ratio of the output values of the first standard flowmeter 24 and the sampling flowmeter, that is, the calibration coefficient of the sampling flowmeter, and waits for the quality control system to automatically adjust the flow according to the calibration coefficient;

[0055] Continue the flow test until the error is within the set range, and the flow test is completed.

[0056] (2) Blank test, specifically:

[0057] The first switching module 22 switches to the quality control state according to the instruction. Under the suction of the pump, the gas enters the main pipeline 25 after passing through the cutter 11, then enters the first bypass 21 through the first switching module 22, and returns to the main pipeline 25 after passing through the filter 23 and the first standard flowmeter 24 in sequence. The gas discharged from the main pipeline 25 passes through the enrichment area of the filter membrane.

[0058] Under the rotation of the driving wheel, the enrichment area moves to the detection path of the analyzer.

[0059] The analyzer obtains the data of the enrichment area and sends it to the quality control device;

[0060] The data is not uploaded as normal monitoring data, but as system blank data. The first 2 groups of data of the blank data are removed, and starting from the 3rd group of data, the average value is calculated as the system blank.

[0061] (3) Element quality control, specifically:

[0062] The carrier plate 31 rotates or advances under the drive of the motor, enters the detection path between the X-ray source and the filter membrane without contacting the filter membrane, so that the element standard is in the detection path; the analyzer outputs the element content of the element standard and sends it to the quality control device;

[0063] The calculation unit calculates the error between the element content and the nominal value of the element standard;

[0064] If the error is within the set range, the quality control is qualified;

[0065] If the error is not within the set range, the analyzer is prompted to be abnormal.

[0066] (4) Element precision test, specifically:

[0067] The carrier plate 31 rotates or advances driven by the motor and enters the detection path between the X-ray source and the filter membrane without contacting the filter membrane. The analyzer outputs the element content and spectrum of the element standard substance and sends them to the quality control device.

[0068] The calculation unit calculates the precision of the element based on the received spectrum and element content.

[0069] If the precision is unqualified, it is prompted that the analyzer is working abnormally.

[0070] (5) Quality control of temperature and pressure, specifically:

[0071] The standard thermometer probe is installed at the same environment and the same height as the atmospheric temperature sensor of the particulate matter online monitoring system. The standard pressure gauge is installed in the quality control device. The particulate matter online monitoring system transmits the measured data of atmospheric temperature and atmospheric pressure to the quality control device. The calculation unit of the quality control device compares the atmospheric temperature and atmospheric pressure data of the monitoring system with the data of the standard atmospheric temperature sensor and the atmospheric pressure gauge to obtain the error and ratio.

[0072] Embodiment 2

[0073] As Figure 3 shown, the particulate matter online monitoring system of this embodiment includes a cutter 11, an eroder 43, a main pipeline 25, an analysis device, and the quality control device in Embodiment 1. The analysis device includes an organic carbon element carbon monitor 13, a pump, a sampling flowmeter, and multiple carrier gas flow paths 14. The cutter 11, the eroder 43, and the organic carbon element carbon monitor 13 are sequentially arranged on the main pipeline 25. Multiple carrier gas flow paths 14 are connected to the organic carbon element carbon monitor 13, and the carrier gas flow rate in each carrier gas flow path 14 is obtained by using the carrier gas flowmeter 141.

[0074] In this embodiment, the monitoring system has only one carrier gas outlet 143, and the only second standard flowmeter 142 is arranged downstream of the carrier gas outlet 143.

[0075] In this example, the quality control device includes a first switching module 22, a first bypass 21, a third switching module 42, a control unit, and a calculation unit; wherein, the first switching module 22 is arranged on the main pipeline 25 and is used to selectively connect the outlet of the cutter 11 to the first bypass 21 or directly connect to the downstream main pipeline 25. A filter 23 and a first standard flowmeter 24 are serially arranged on the first bypass 21. As Figure 3As shown in the figure, the third switching module 42 is disposed on the main pipeline 25 downstream of the first bypass 21 and upstream of the etcher 43, and is used to selectively connect the main pipeline 25 to the second bypass 41 or the downstream etcher 43. Optionally, the first switching module 22 and the third switching module 42 adopt three-way ball valves. One end of the pipeline on the second bypass 41 is connected to the third switching module 42, and the other end is connected to the main pipeline 25 downstream of the etcher 43. The control unit is used to switch the first switching module 22 and the third switching module 42 according to instructions. The calculation unit is used to calculate the error between the output values of the first standard flowmeter 24 and the sampling flowmeter and the correction coefficient of the sampling flowmeter, as well as calculate the ratio between the output values of the analyzers (i.e., the etcher efficiency), the error between the output values of the carrier gas flowmeter 141 and the second standard flowmeter 142, and obtain the correction coefficient of the carrier gas flowmeter 141. The quality control system automatically adjusts the flow according to the correction coefficient of the sampling flowmeter and the correction coefficient of the carrier gas flowmeter 141.

[0076] The quality control process of the particulate matter online monitoring system according to the embodiment of the present invention is as follows:

[0077] (1) Flow rate test, specifically:

[0078] The first switching module 22 is switched to the quality control state according to the instruction. Under the suction of the pump, the gas enters the main pipeline 25 after passing through the cutter 11, then passes through the first switching module 22 and enters the first bypass, and then returns to the main pipeline 25 after passing through the filter 23 and the first standard flowmeter 24, and enters the organic carbon and elemental carbon monitor 13 after passing through the etcher 43;

[0079] The gas passes through the pump and the sampling flowmeter;

[0080] The calculation unit calculates the error between the output values of the first standard flowmeter 24 and the sampling flowmeter;

[0081] If the error is within the set range, the flow rate test is completed;

[0082] If the error is not within the set range, the calculation unit obtains the ratio of the output values of the first standard flowmeter 24 and the sampling flowmeter, that is, the correction coefficient of the sampling flowmeter, and the quality control system automatically adjusts the flow according to the correction coefficient.

[0083] Continue the flow rate test until the error is within the set range.

[0084] (2) Blank test, specifically:

[0085] The first switching module 22 switches to the quality control state according to the instruction. Under the suction of the pump, the gas enters the main pipeline 25 after passing through the cutter 11, then passes through the first switching module 22 and enters the first bypass 21, and returns to the main pipeline 25 after passing through the filter 23 and the first standard flowmeter 24 in sequence, and enters the organic carbon elemental carbon monitor 13 after passing through the eroder 43.

[0086] The gas passes through the pump and the sampling flowmeter.

[0087] The organic carbon elemental carbon monitor 13 outputs data and sends it to the quality control device;

[0088] The data is not uploaded as normal monitoring data, but as system blank data. The first 2 groups of data of the blank data are removed, and starting from the 3rd group of data, the average value is calculated as the system blank.

[0089] (3) Detection limit test, which is specifically the same as the blank test, except for the different number of operating cycles.

[0090] (4) Eroding efficiency test of the eroder 43, specifically:

[0091] The first switching module 22 switches to the quality control state according to the instruction. Under the suction of the pump, the gas enters the main pipeline 25 after passing through the cutter 11, then passes through the first switching module 22 and enters the first bypass 21, and returns to the main pipeline 25 after passing through the filter 23 and the first standard flowmeter 24 in sequence.

[0092] The gas in the main pipeline 25 enters the organic carbon elemental carbon monitor 13 after passing through the eroder 43 for concentration measurement, and the measured concentration after passing through the eroder 43 is obtained and sent to the calculation unit.

[0093] The first switching module 22 and the third switching module 42 switch to the quality control state according to the instruction. Under the suction of the pump, the gas enters the main pipeline 25 after passing through the cutter 11, then passes through the first switching module 22 and enters the first bypass 21, and returns to the main pipeline 25 after passing through the filter 23 and the first standard flowmeter 24 in sequence.

[0094] The gas in the main pipeline 25 enters the second bypass 41 through the third switching module 42 and returns to the main pipeline 25 again, bypassing the eroder 43.

[0095] The gas in the main pipeline 25 enters the organic carbon elemental carbon monitor 13 for concentration measurement, and the measured concentration without passing through the eroder 43 is obtained and sent to the calculation unit.

[0096] The measured concentration data passing through the eroder 43 and not passing through the eroder 43 are averaged separately by the calculation unit, and then the average value of the measured concentration not passing through the eroder 43 is subtracted from the average value of the measured concentration passing through the eroder 43. The percentage of the difference in the average value of the measured concentration not passing through the eroder 43 is the filtration efficiency of the eroder 43.

[0097] (5) Carrier gas flow path quality control, specifically:

[0098] The control unit sends a separate carrier gas calibration instruction to the monitor, and the monitor stops running.

[0099] The particulate matter online monitoring system conducts calibration of a single carrier gas flowmeter. For example, when calibrating the first carrier gas flow path, the solenoid valves of other carrier gas flow paths are closed. The carrier gas flow path to be calibrated passes through different flow rates of carrier gas in sequence according to the instructions of the quality control device. The carrier gas passes through the carrier gas flowmeter 141, discharges from the carrier gas outlet 143, and passes through the second standard flowmeter.

[0100] The output values of the carrier gas flowmeter 141 and the second standard flowmeter 142 are uploaded to the calculation unit.

[0101] The calculation unit obtains the error between the output values of the second standard flowmeter 142 and the carrier gas flowmeter 141;

[0102] If the error is not within the set range, the calculation unit calculates the correction coefficient of the carrier gas flowmeter according to the output values of the second standard flowmeter 142 and the carrier gas flowmeter 141, and waits for the quality control system to automatically adjust the flow rate according to the correction coefficient.

[0103] Continue the carrier gas flow rate test until the error is within the set range.

[0104] Carrier gas overall quality control, specifically:

[0105] Send a carrier gas overall calibration instruction to the monitor, and the monitor does not need to stop running;

[0106] In the analysis stage, all carrier gas flow paths 14 are opened, and several carrier gases are aggregated at the carrier gas outlet 143. The carrier gas outlet flow rate should be stable at a specific value; the output values of each carrier gas flowmeter 141 and the second standard flowmeter 142 are sent to the calculation unit;

[0107] The calculation unit calculates the sum of the output values of each carrier gas flowmeter, and the error between the sum of the output values of the second standard flowmeter and the sum of the output values;

[0108] Judge whether the overall carrier gas flow rate can meet the requirements according to the error.

[0109] (6) Temperature and pressure quality control, and the specific method is the same as that in Embodiment 1.

[0110] Embodiment 3

[0111] The particulate matter on-line monitoring system of this embodiment is different from that of Embodiment 2 in that the filter 23 and the first standard flowmeter 24 are arranged in parallel on the first bypass 21, and a second switching module 26 is provided accordingly; moreover, the organic carbon and elemental carbon monitor 13 has multiple carrier gas outlets, and a second standard flowmeter 142 is provided downstream of each carrier gas outlet, as Figure 4 shown. Specifically:

[0112] 1. In the first bypass, a first branch 211 and a second branch 212 are arranged in parallel. The second switching module 26 is arranged on the first bypass 21 downstream of the first switching module 22. A three-way ball valve is adopted, so that the first outlet of the first switching module 22 is selectively connected to the first branch 211 or the second branch 212, and the second outlet of the first switching module 22 is directly connected to the downstream main pipeline 25.

[0113] During the quality control process, through the switching of the second switching module 26, the gas in the first bypass 21 is selectively passed through the first standard flowmeter 24 or the filter 23.

[0114] 2. It has multiple carrier gas outlets, and a second standard flowmeter 142 is provided downstream of each carrier gas outlet.

[0115] In the carrier gas quality control of the selected carrier gas flow path 14, the calculation unit obtains the error between the output value of the second standard flowmeter and the output value of the carrier gas flowmeter on the carrier gas flow path 14, as well as the correction coefficient of the carrier gas flowmeter, and the quality control system automatically adjusts the flow according to the correction coefficient.

[0116] In the overall carrier gas quality control, the calculation unit obtains the error between the sum of the output values of all carrier gas flowmeters and the sum of the output values of all second standard flowmeters, and judges whether the overall carrier gas flow can meet the requirements.

[0117] Embodiment 4

[0118] The particulate matter on-line monitoring system of this embodiment is different from that of Embodiment 1 in that:

[0119] 1. The analyzer uses a black carbon monitor. The quality control device further includes a standard filter and a second driving unit. Driven by the second driving unit (such as a motor), the standard filter is moved to or out of the detection optical path of the black carbon monitor as needed.

[0120] 2. In the first bypass, a first branch 211 and a second branch 212 are arranged in parallel. The first switching module 22 uses an electromagnetic four-way valve, so that the outlet of the cutter 11 is selectively connected to the downstream main pipeline 25, the first branch 211 or the second branch 212.

[0121] During the quality control process, through the switching of the first switching module 22, the gas selectively passes through the first standard flowmeter 24, the filter 23, and the downstream main pipeline 25.

[0122] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present application. It should be understood that the above description is only for the specific embodiments of the present application and is not used to limit the protection scope of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A quality control device is provided on the main pipeline of the particulate matter online monitoring system; characterized in that, The quality control device includes a box body and a control unit. A first bypass, a filter, and a first standard flowmeter are provided inside the box body, and a first switching module is provided outside the box body. Among them, the inlet end of the first bypass is connected to the first outlet of the first switching module, and the outlet end of the first bypass allows for connection to the downstream main pipeline. The first switching module is configured to selectively connect the upstream main pipeline to the downstream main pipeline or the first bypass. The control unit is configured to control the flow path switching of the first switching module. The filter and the first standard flowmeter are provided in the first bypass.

2. The quality control device according to claim 1, wherein The filter and the first standard flowmeter are connected in series in the first bypass. Or, The filter and the first standard flowmeter are connected in parallel in the first bypass. The first bypass includes a first branch and a second branch arranged in parallel. The filter is provided on the first branch, and the first standard flowmeter is provided on the second branch. The first switching module can selectively connect the upstream main pipeline to the downstream main pipeline, the first branch, or the second branch.

3. The quality control device according to claim 2, wherein A second switching module is provided on the first bypass, and the second switching module is located downstream of the first switching module. The second switching module is configured to selectively connect the first outlet of the first switching module to the first branch or the second branch.

4. The quality control device according to any one of claims 1 to 3, characterized in that The quality control device further includes a second bypass and a third switching module. The third switching module is provided outside the box body and is configured to selectively connect the main pipeline downstream of the first switching module and the first bypass to the downstream main pipeline or the second bypass. The second bypass is provided inside the box body. The inlet end of the second bypass is connected to the first outlet of the third switching module, and the outlet end of the second bypass is connected to the main pipeline downstream of the third switching module.

5. The quality control device according to claim 1, characterized in that, The quality control device further includes a calculation unit. The calculation unit is used to obtain the error and ratio between the output value of the first standard flowmeter and the output value of the sampling flowmeter of the system to be quality controlled. The ratio is the calibration coefficient of the sampling flowmeter, and the system to be quality controlled automatically adjusts the flow rate according to the calibration coefficient.

6. An on-line particulate matter monitoring system, characterized in that It includes a main pipeline. The quality control device and an analyzer described in any one of claims 1-5 are provided on the main pipeline. The first switching module of the quality control device is provided on the main pipeline, and the outlet end of the first bypass is connected to the main pipeline downstream of the first switching module.

7. The online particulate matter monitoring system according to claim 6, characterized in that, The analyzer is a particulate matter element monitor, and the particulate matter online monitoring system further includes: An enrichment unit for enriching and removing particulate matter in the gas in the main pipeline. A first driving unit for moving the elemental standard to the detection channel of the analyzer. Among them, the elemental standard includes: A carrier plate having a through hole, and the thickness of the part of the carrier plate surrounding the through hole is smaller than other parts. A standard unit provided at the through hole, including a first membrane, a second membrane, and a third membrane connected in sequence. A variety of elements with known concentrations are attached to the second membrane.

8. The on-line particulate matter monitoring system according to claim 6, characterized in that, The analyzer is an organic carbon element carbon monitor. The denuder is arranged on the main pipeline downstream of the third switching module. The inlet end of the second bypass is connected to the third switching module upstream of the denuder, and the outlet end of the second bypass is connected to the main pipeline downstream of the denuder.

9. The on-line particulate matter monitoring system according to claim 6, characterized in that, The analyzer is a black carbon monitor. The quality control device further includes: a standard filter and a second driving unit, and the second driving unit is used to drive the standard filter so that the standard filter is located on the detection optical path of the black carbon monitor as required.

10. The on-line particulate matter monitoring system according to claim 8, characterized in that The particulate matter online monitoring system further includes: a plurality of carrier gas flow paths respectively connected to the analyzer, and a carrier gas flowmeter is arranged on each carrier gas flow path; The quality control device further includes a second standard flowmeter, and the second standard flowmeter is arranged downstream of the carrier gas outlet of the analyzer.

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