A fixed pollution source flow in-situ calibration device and calibration method

Abstract

The present application discloses an in-situ calibration device and calibration method for a fixed pollution source flow rate, and relates to the field of testing and measurement technology. The calibration device includes: a tracer gas release device, a smoke drainage device, a measurement and analysis device, and a control system; the tracer gas release device is connected to the fixed pollution source flue, and is used to release tracers to the fixed pollution source flue; the smoke drainage device is respectively connected to the fixed pollution source flue and the tracer gas release device, and is used to achieve smoke drainage; the measurement and analysis device is connected to the fixed pollution source flue, and is used to achieve in-situ calibration of the fixed pollution source flow rate; the control system is respectively connected to the tracer gas release device, the smoke drainage device, and the measurement and analysis device, and is used to control the operation of each device. The present application can eliminate or reduce the measurement errors caused by factors such as the medium difference, flow field uniformity, and environmental differences between the calibration process and the actual measurement process.

Description

Technical Field

[0001] The present application relates to the field of testing and measurement technology, and in particular to an in-situ calibration device and calibration method for a fixed pollution source flow. Background Art

[0002] At present, the online measurement of flow from fixed pollution sources mostly uses the measurement accuracy of the flowmeter calibrated by the metrology department as the basis for accuracy. On-site calibration usually refers to the Relative Accuracy Test Audit (RATA) method of the United States Environmental Protection Agency (USEPA), using a calibrated flowmeter to measure the flue gas velocity at different positions of the orthogonal chord of the flow monitoring section of the fixed pollution source flue gas flow, so as to obtain the velocity field coefficient of the flow field of the monitoring section for flow calibration. However, there are large differences between the laboratory device used by the metrology department to calibrate the flowmeter and the flow field uniformity, flow medium, temperature and humidity, and particulate matter concentration of the on-site flue. These factors make it impossible for conventional flow field calibration methods to be strictly traced back to the flow standard device, and directly affect the accuracy of flow measurement, resulting in technical difficulties in the online measurement of fixed pollution source flow.

[0003] Therefore, how to eliminate or reduce the measurement errors caused by factors such as medium differences, flow field uniformity and environmental differences between the laboratory calibration process and the actual measurement process has become a technical problem that needs to be urgently solved in this field. Summary of the invention

[0004] The purpose of this application is to provide an in-situ calibration device and method for fixed pollution source flow, which can eliminate the measurement error caused by factors such as medium differences, flow field uniformity and environmental differences between the laboratory calibration process and the actual measurement process. The device and method can also be used for accurate measurement of real flue gas flow.

[0005] To achieve the above objectives, this application provides the following solutions.

[0006] In a first aspect, the present application provides an in-situ calibration device for a fixed pollution source flow rate, wherein the in-situ calibration device for a fixed pollution source flow rate comprises: a tracer gas release device, a flue gas drainage device, a measurement and analysis device, and a control system.

[0007] The tracer gas release device is connected to the flue of the fixed pollution source and is used to release the tracer to the flue of the fixed pollution source.

[0008] The smoke drainage device is respectively connected to the fixed pollution source flue and the tracer gas release device to achieve smoke drainage.

[0009] The measuring and analyzing device is connected to the flue of the fixed pollution source and is used to realize the in-situ calibration of the fixed pollution source flow.

[0010] The control system is respectively connected to the tracer gas release device, the smoke drainage device and the measurement and analysis device, and is used to control the operation of each device.

[0011] Optionally, the tracer gas release device includes: a first gas cylinder rack, a tracer gas cylinder, a first pressure reducing valve, a first solenoid valve, a first mass flow meter, a tee, a release pipe and a plurality of connecting pipelines.

[0012] The first gas cylinder rack is fixedly installed on the placement platform, and the tracer gas cylinder is placed in the first gas cylinder rack; the tracer gas cylinder stores a tracer.

[0013] The tracer gas cylinder is connected to the inlet of the first mass flow meter through the first pressure reducing valve and the first solenoid valve in sequence; the outlet of the first mass flow meter is connected to the release pipe through the tee in sequence.

[0014] The release pipe extends into the interior of the fixed pollution source flue through the first opening, perpendicular to the flue gas flow direction; the first opening is sealed.

[0015] Optionally, the end of the release tube is sealed, and a plurality of release tube holes are evenly distributed on both sides perpendicular to the direction of smoke flow.

[0016] Optionally, the smoke drainage device includes: a drainage pipe, a suction pump, a second mass flow meter, a second solenoid valve and a plurality of connecting pipelines.

[0017] The end of the drainage pipe extends into the interior of the fixed pollution source flue through the second opening; the second opening is sealed.

[0018] The starting end of the drainage pipe is connected to the inlet of the vacuum pump; the outlet of the vacuum pump is connected to the inlet of the second mass flow meter; the outlet of the second mass flow meter is connected to the three-way connection of the tracer gas release device via the second solenoid valve, and flows into the fixed pollution source flue through the release pipe.

[0019] Optionally, the measuring and analyzing device includes: a tracer concentration analyzer, a drying tube, a calibration standard gas cylinder, a second pressure reducing valve, a third solenoid valve, a second gas cylinder rack, a reversing valve, a third mass flow meter, a flue gas sampling pipeline and a plurality of connecting pipelines.

[0020] The inlet of the tracer concentration analyzer is connected to the reversing valve via the third mass flow meter and the drying tube in sequence.

[0021] The second gas cylinder rack is fixedly installed on the placement platform, and the calibration standard gas cylinder is placed in the second gas cylinder rack; the calibration standard gas cylinder stores calibration standard gas; and the calibration standard gas is used to calibrate the tracer concentration analyzer.

[0022] The gas outlet of the calibration standard gas cylinder is connected to the reversing valve via the second pressure reducing valve and the third solenoid valve in sequence; the reversing valve is connected to the starting end of the flue gas sampling pipeline; the end of the flue gas sampling pipeline extends into the interior of the fixed pollution source flue through the third opening, and the sampling point is located at the flow monitoring section; the third opening is sealed.

[0023] Optionally, the control system includes: an industrial computer, a real-time controller, a control drive circuit, a data acquisition device, a DC regulated power supply and a plurality of data connection lines.

[0024] The industrial computer communicates with the real-time controller to receive data collected by the real-time controller and send dynamic control instructions of each valve to the real-time controller.

[0025] The real-time controller is connected to the control drive circuit, and is used to complete digital I / O control and signal acquisition of the mass flow meter and the tracer concentration analyzer through digital logic, and output the signal to the control drive circuit; it is also used to work based on the data collected by the data collector.

[0026] The control drive circuit is connected to the first solenoid valve, the second solenoid valve and the third solenoid valve respectively, and is used to complete the start and stop of the measurement, the solenoid valve drive and the current signal backtest.

[0027] The data collector is used to collect and process the mass flow meter and tracer concentration parameters.

[0028] The DC regulated power supply supplies power to the first solenoid valve, the second solenoid valve, the third solenoid valve, the reversing valve, the first mass flowmeter, the second mass flowmeter and the third mass flowmeter through the control drive circuit.

[0029] In the second aspect, the present application provides a method for in-situ calibration of the flow rate of a fixed pollution source, which is implemented based on the in-situ calibration device for the flow rate of a fixed pollution source as described in any of the above items, and includes the following contents.

[0030] Obtain tracer release flow data and tracer concentration analyzer measurement signal within the calibration time.

[0031] Get the flow rate to be calibrated within the calibration time.

[0032] The correction coefficient is calculated based on the tracer release flow rate data within the calibration time, the tracer concentration analyzer measurement signal, and the flow rate to be calibrated within the calibration time.

[0033] Optionally, before obtaining the tracer release flow data and the tracer concentration analyzer measurement signal within the calibration time, the fixed pollution source flow in-situ calibration method also includes the following contents.

[0034] The calibration standard gas cylinder is connected to the tracer concentration analyzer by using a reversing valve; the calibration standard gas inlet flow rate is adjusted by a third mass flow meter, the tracer concentration analyzer is calibrated for concentration, and a calibration standard gas signal is obtained.

[0035] The flue gas sampling pipeline is connected to the tracer concentration analyzer by a reversing valve to measure the tracer background concentration in the flue of the fixed pollution source.

[0036] The tracer release flow rate is adjusted according to the tracer background concentration, and when the tracer concentration analyzer measurement signal is close to the calibration standard gas signal, the tracer release flow rate is fixed.

[0037] Optionally, the correction coefficient is calculated based on the tracer release flow data and the tracer concentration analyzer measurement signal within the calibration time and the flow to be calibrated within the calibration time, which specifically includes the following contents.

[0038] The standard flow rate within the calibration time is calculated based on the tracer release flow rate data within the calibration time and the concentration measurement signal of the tracer concentration analyzer.

[0039] Calculate the average value of the standard flow rate during the calibration period.

[0040] According to the flow to be calibrated within the calibration time, an average value of the flow to be calibrated within the calibration time is calculated.

[0041] The correction coefficient is calculated based on the average value of the standard flow rate within the calibration time and the average value of the flow rate to be calibrated within the calibration time.

[0042] Optionally, the in-situ calibration method for fixed pollution source flow also includes: status check; the status check includes: air tightness check of the pipelines of the tracer gas release device, the smoke drainage device and the calibration device to ensure good air tightness; check that the tracer concentration analyzer, industrial computer, real-time controller, control drive circuit, data acquisition device and DC regulated power supply can all work normally.

[0043] According to the specific embodiments provided in this application, this application discloses the following technical effects.

[0044] The present application provides an in-situ calibration device and calibration method for the flow rate of a fixed pollution source, the in-situ calibration device for the flow rate of a fixed pollution source comprising: a tracer gas release device, a smoke drainage device, a measurement and analysis device and a control system; the tracer gas release device is connected to the flue of the fixed pollution source, and is used to release tracers to the flue of the fixed pollution source; the smoke drainage device is respectively connected to the flue of the fixed pollution source and the tracer gas release device, and is used to achieve smoke drainage; the measurement and analysis device is connected to the flue of the fixed pollution source, and is used to achieve in-situ calibration of the flow rate of the fixed pollution source; the control system is respectively connected to the tracer gas release device, the smoke drainage device and the measurement and analysis device, and is used to control the operation of each device. The present application continuously injects a tracer into the flue of a fixed pollution source, and the tracer is mixed and diluted with the gas in the flue of the fixed pollution source and then transmitted to the flue of the fixed pollution source downstream. By accurately measuring the upstream tracer injection flow rate and the downstream concentration, the standard flow rate of the flue can be calculated according to the mass balance principle to achieve in-situ calibration of the flow rate monitoring of the fixed pollution source. The flow calibration method adopted in the present application avoids the measurement of parameters such as flue gas flow velocity, flue cross-sectional area, flue temperature and humidity, is not easily affected by the uneven flow field in the flue, and significantly improves the flow measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 A schematic structural diagram of an in-situ calibration device for a fixed pollution source flow rate provided in one embodiment of the present application.

[0047] Figure 2 This is a simplified diagram of the release tube structure provided in one embodiment of the present application.

[0048] Figure 3 A schematic diagram of a control system provided in accordance with an embodiment of the present application.

[0049] Figure 4 A schematic flow chart of an in-situ calibration method for a fixed pollution source flow provided in one embodiment of the present application.

[0050] Reference numerals:

[0051] 1-placing platform, 2-calibration standard gas cylinder, 3-second gas cylinder rack, 4-second pressure reducing valve, 5-third solenoid valve, 6-reversing valve, 7-drying tube, 8-third mass flowmeter, 9-tracer concentration analyzer, 10-first gas cylinder rack, 11-tracer gas cylinder, 12-first pressure reducing valve, 13-first solenoid valve, 14-first mass flowmeter, 15-tee, 16-second mass flowmeter, 17-second solenoid valve, 18-vacuum pump, 19-release pipe, 20-fixed pollution source flue, 21-drainage pipe, 22-smoke sampling pipeline, 30-release pipe small hole, 100-tracer gas release device, 200-smoke drainage device, 300-measurement and analysis device. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0053] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0054] In order to address the measurement and calibration system errors caused by the uneven flow field in the flue of fixed pollution sources, as well as the degradation of the flow meter's performance due to long-term use under harsh working conditions such as high temperature, high humidity, and high dust, it is necessary to perform in-situ calibration of the fixed pollution source flow measurement to obtain the calibration coefficient at the test site and eliminate the effects caused by different calibration media, flow field uniformity, and differences in temperature, humidity, and dust environment.

[0055] like Figure 1 As shown, the present application provides an in-situ calibration device for a fixed pollution source flow rate, and the in-situ calibration device for a fixed pollution source flow rate includes: a tracer gas release device 100, a smoke drainage device 200, a measurement and analysis device 300 and a control system.

[0056] The tracer gas release device 100 is in communication with the fixed pollution source flue 20 and is used to release the tracer into the fixed pollution source flue 20 .

[0057] The smoke drainage device 200 is respectively connected to the fixed pollution source flue 20 and the tracer gas release device 100 to achieve smoke drainage.

[0058] The measuring and analyzing device 300 is connected to the fixed pollution source flue 20 and is used to realize the in-situ calibration of the fixed pollution source flow.

[0059] The control system is respectively connected to the tracer gas release device 100 , the smoke drainage device 200 and the measurement and analysis device 300 , and is used to control the operation of each device.

[0060] In an exemplary embodiment, the tracer gas release device 100 includes: a first gas cylinder stand 10, a tracer gas cylinder 11, a first pressure reducing valve 12, a first solenoid valve 13, a first mass flow meter 14, a tee 15, a release pipe 19 and a plurality of connecting pipes.

[0061] The first gas cylinder rack 10 is fixedly mounted on the placement platform 1 , and the tracer gas cylinder 11 is placed in the first gas cylinder rack 10 ; the tracer gas cylinder 11 stores a tracer.

[0062] The tracer gas cylinder 11 is connected to the inlet of the first mass flow meter 14 through the first pressure reducing valve 12 and the first solenoid valve 13 in sequence; the outlet of the first mass flow meter 14 is connected to the release pipe 19 through the tee 15 in sequence.

[0063] The release pipe 19 extends into the fixed pollution source flue 20 through the first opening, perpendicular to the flue gas flow direction; the first opening is sealed.

[0064] like Figure 2 As shown, in another exemplary embodiment of the present application, the end of the release tube is sealed, and a plurality of release tube holes 30 are evenly distributed on both sides perpendicular to the flue gas flow direction. The smoke guide device 200 of the present application uses the flue gas flow and the release tube holes 30 to inject the tracer into the flue at high speed, which significantly enhances the uniform mixing of the tracer and the flue gas in the flue and reduces the uncertainty of flow measurement.

[0065] In an exemplary embodiment, the smoke drainage device 200 includes: a drainage pipe 21, a suction pump 18, a second mass flow meter 16, a second solenoid valve 17 and a plurality of connecting pipelines.

[0066] The end of the drainage pipe 21 extends into the interior of the fixed pollution source flue 20 through the second opening; the second opening is sealed.

[0067] The starting end of the drainage pipe 21 is connected to the inlet of the vacuum pump 18; the outlet of the vacuum pump 18 is connected to the inlet of the second mass flow meter 16; the outlet of the second mass flow meter 16 is connected to the three-way 15 of the tracer gas release device 100 via the second solenoid valve 17, and is merged into the fixed pollution source flue 20 through the release pipe 19.

[0068] In an exemplary embodiment, the measurement and analysis device 300 includes: a tracer concentration analyzer 9, a drying tube 7, a calibration standard gas cylinder 2, a second pressure reducing valve 4, a third solenoid valve 5, a second gas cylinder rack 3, a reversing valve 6, a third mass flow meter 8, a flue gas sampling pipeline 22 and a plurality of connecting pipelines.

[0069] The inlet of the tracer concentration analyzer 9 is connected to the reversing valve 6 via the third mass flow meter 8 and the drying pipe 7 in sequence.

[0070] The second gas cylinder rack 3 is fixedly mounted on the placement platform 1 , and the calibration standard gas cylinder 2 is placed in the second gas cylinder rack 3 ; the calibration standard gas cylinder 2 stores calibration standard gas; and the calibration standard gas is used to calibrate the tracer concentration analyzer 9 .

[0071] The gas outlet of the calibration standard gas cylinder 2 is connected to the reversing valve 6 via the second pressure reducing valve 4 and the third solenoid valve 5 in sequence; the reversing valve 6 is connected to the starting end of the flue gas sampling pipeline 22; the end of the flue gas sampling pipeline 22 extends into the interior of the fixed pollution source flue 20 through the third opening, and the sampling point is located at the flow monitoring section; the third opening is sealed.

[0072] like Figure 3 As shown, in an exemplary embodiment, the control system includes: an industrial computer, a real-time controller, a control drive circuit, a data acquisition device, a DC regulated power supply, and a plurality of data connection lines.

[0073] The industrial computer communicates with the real-time controller to receive data collected by the real-time controller, and sends dynamic control instructions of each valve to the real-time controller to complete human-computer interaction.

[0074] The real-time controller is connected to the control drive circuit, and is used to complete digital I / O control and signal acquisition of the mass flow meter and the tracer concentration analyzer through digital logic, and output the signal to the control drive circuit; it is also used to work based on the data collected by the data collector; the real-time controller uses the NI CompactRIO high-reliability measurement and control platform.

[0075] The control drive circuit is connected to the first solenoid valve, the second solenoid valve and the third solenoid valve respectively, and is used to complete the start and stop of the measurement, the solenoid valve drive and the current signal backtest.

[0076] The data acquisition device is NI mioDAQ data acquisition equipment from Emerson Corporation of the United States, which is used to collect and process parameters such as mass flow meter and tracer concentration.

[0077] The DC regulated power supply supplies power to the first solenoid valve, the second solenoid valve, the third solenoid valve, the reversing valve, the first mass flowmeter, the second mass flowmeter and the third mass flowmeter through the control drive circuit.

[0078] It should be noted that the in-situ calibration device for fixed pollution source flow described in this embodiment can not only be used for calibration, but also for direct measurement.

[0079] The present application continuously injects tracers upstream of the flue of a fixed pollution source, and the tracers are mixed and diluted with the gas in the flue of the fixed pollution source and then transmitted to the flue downstream of the fixed pollution source. By accurately measuring the upstream tracer injection flow and the downstream concentration, the standard flue flow can be calculated according to the mass balance principle to achieve in-situ calibration of fixed pollution source flow monitoring. The flow calibration method adopted in the present application avoids the measurement of parameters such as flue gas velocity, flue cross-sectional area, flue temperature and humidity, is not easily affected by the uneven flow field in the flue, and significantly improves the flow measurement accuracy. At the same time, the device can remotely control the system valves and data acquisition, and can perform remote automatic calibration.

[0080] In an exemplary embodiment, Figure 4 As shown, a method for in-situ calibration of the flow rate of a fixed pollution source is provided. The method for in-situ calibration of the flow rate of a fixed pollution source is implemented based on the in-situ calibration device for the flow rate of a fixed pollution source described in any one of the above items, and the method for in-situ calibration of the flow rate of a fixed pollution source includes the following contents.

[0081] S1: Obtain tracer release flow data and tracer concentration analyzer measurement signal within the calibration time.

[0082] S2: Get the flow to be calibrated within the calibration time.

[0083] S3: Calculate and obtain a correction coefficient according to the tracer release flow rate data within the calibration time, the tracer concentration analyzer measurement signal, and the flow rate to be calibrated within the calibration time.

[0084] As an optional implementation, before step S1, the fixed pollution source flow in-situ calibration method further includes the following contents.

[0085] S4: connecting the calibration standard gas cylinder and the tracer concentration analyzer by using a reversing valve; adjusting the calibration standard gas inlet flow rate by using a third mass flow meter, performing concentration calibration on the tracer concentration analyzer, and obtaining a calibration standard gas signal.

[0086] S5: Use a reversing valve to connect the flue gas sampling pipeline with the tracer concentration analyzer to measure the tracer background concentration in the flue of the fixed pollution source.

[0087] S6: adjusting the tracer release flow rate according to the tracer background concentration, and fixing the tracer release flow rate when the tracer concentration analyzer measurement signal is close to the calibration standard gas signal.

[0088] As an optional implementation, in step S3, the following contents are specifically included.

[0089] S31: Calculate the standard flow rate within the calibration time according to the tracer release flow rate data within the calibration time and the concentration measurement signal of the tracer concentration analyzer.

[0090] S32: Calculate the average value of the standard flow rate within the calibration time.

[0091] S33: Calculate the average value of the flow rate to be calibrated within the calibration time according to the flow rate to be calibrated within the calibration time.

[0092] S34: Calculate a correction coefficient according to an average value of the standard flow rate within the calibration time and an average value of the flow rate to be calibrated within the calibration time.

[0093] As an optional implementation, the in-situ calibration method for the fixed pollution source flow rate also includes: status check; the status check includes: performing an airtightness check on the pipelines of the tracer gas release device, the smoke drainage device and the calibration device to ensure good airtightness; checking that the tracer concentration analyzer, the industrial computer, the real-time controller, the control drive circuit, the data acquisition device and the DC regulated power supply are all operating normally.

[0094] Therefore, based on the above-mentioned fixed pollution source flow in-situ calibration device, the calibration method of the device is specifically as follows.

[0095] (1) Status check

[0096] Check the air tightness of the pipelines of the tracer gas release device, smoke drainage device and calibration device to ensure good air tightness; check that the tracer concentration analyzer, industrial computer, real-time controller, control drive circuit, data acquisition device and DC regulated power supply are working normally.

[0097] (2) Tracer analyzer measurement calibration.

[0098] The calibration standard gas cylinder is connected to the tracer concentration analyzer through a reversing valve; the calibration standard gas inlet flow rate is adjusted through a third mass flowmeter, the tracer concentration analyzer is calibrated for concentration, and a calibration standard gas signal is obtained.

[0099] (3) Measurement of tracer background concentration.

[0100] The flue gas sampling pipeline is connected to the tracer concentration analyzer through a reversing valve to measure the tracer background concentration in the flue of the fixed pollution source.

[0101] (4) Tracer injection.

[0102] According to the tracer background concentration, the tracer release flow rate is adjusted, and the tracer concentration analyzer measurement signal is observed at the same time. When the tracer concentration analyzer measurement signal is close to the calibration standard gas signal, the tracer release flow rate is fixed.

[0103] (5) Flow in-situ calibration.

[0104] Set the calibration time and start timing, and record the tracer release flow data and tracer concentration analyzer measurement data in real time; after the calibration time has passed, stop timing and change the reversing valve flow direction, and repeat step (2) to perform a second calibration on the tracer analyzer concentration measurement.

[0105] It should be noted that, in theory, any instrument will drift after measuring for a period of time. For example, before the measurement, the instrument measurement signal corresponding to 100ppb standard gas is A, and after the measurement, the instrument measurement signal corresponding to the same 100ppb standard gas is B. In the end, the concentration corresponding to the signal in the actual measurement can be calculated through the relationship that the signal corresponding to 100ppb is (A+B) / 2 to reduce the system error. Therefore, it is necessary to perform a secondary calibration.

[0106] (6) Calculate the correction factor k for the flow rate to be calibrated.

[0107] Step (6.1) calculates the standard flow rate within the calibration time based on the tracer release flow rate data within the calibration time and the concentration measurement signal of the tracer concentration analyzer.

[0108] (1);

[0109] in, is the standard flow rate during the calibration period, ; is the volume concentration of tracer in the flow monitoring section, ppbv; is the background volume concentration of the tracer in the flue, ppbv; is the tracer release rate, L / min.

[0110] Step (6.2) calculates the average value of the standard flow rate during the calibration period.

[0111] (2);

[0112] in, is the average value of the standard flow rate during the calibration period, ; is the number of standard flow samples within the calibration period.

[0113] Step (6.3) calculates the uncertainty of the standard flow rate.

[0114] (3);

[0115] in, Indicates the range of the samples measured within the calibration period.

[0116] It should be noted that although the standard flow rate is accurate, due to the systematic and random errors of the flow meter and concentration analyzer, the uncertainty needs to be given, such as the uncertainty is less than or equal to 3. Measurement data without uncertainty is meaningless.

[0117] Step (6.4) calculates the average value of the flow rate to be calibrated within the calibration time according to the flow rate to be calibrated within the calibration time.

[0118] (4);

[0119] in, is the average value of the flow to be calibrated within the calibration time. ; is the flow to be calibrated within the calibration time. .

[0120] Step (6.5) calculates the correction coefficient based on the average value of the standard flow rate within the calibration time and the average value of the flow rate to be calibrated within the calibration time.

[0121] (5);

[0122] in, is the correction factor.

[0123] By obtaining the correction factor Complete the calibration of the flow to be calibrated.

[0124] The present application also provides an application scenario, which applies the above-mentioned in-situ calibration method for fixed pollution source flow. Specifically: The in-situ calibration method for fixed pollution source flow provided in this embodiment can be applied in testing and measurement scenarios. The testing and measurement scenario includes: a tracer release flow data acquisition link within the calibration period, a corresponding tracer concentration analyzer measurement signal link, a flow acquisition link to be calibrated within the calibration period, and a correction coefficient calculation link; first, obtain the tracer release flow data and the tracer concentration analyzer measurement signal within the calibration period; secondly, obtain the flow to be calibrated within the calibration period; then, according to the tracer release flow data and the tracer concentration analyzer measurement signal within the calibration period and the flow to be calibrated within the calibration period, the correction coefficient can be calculated.

[0125] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0126] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A fixed pollution source flow in-situ calibration device, characterized in that: The fixed pollution source flow in-situ calibration device comprises: a tracer gas release device, a smoke drainage device, a measurement and analysis device and a control system; The tracer gas release device is connected to the flue of the fixed pollution source and is used to release the tracer into the flue of the fixed pollution source; The smoke drainage device is connected to the fixed pollution source flue and the tracer gas release device respectively, and is used to achieve smoke drainage; The measuring and analyzing device is connected to the flue of the fixed pollution source and is used to realize the in-situ calibration of the fixed pollution source flow; The control system is connected to the tracer gas release device, the smoke drainage device and the measurement and analysis device respectively, and is used to control the operation of each device; The tracer gas release device comprises: a first gas cylinder stand, a tracer gas cylinder, a first pressure reducing valve, a first solenoid valve, a first mass flow meter, a tee, a release pipe and a plurality of connecting pipelines; The first gas cylinder rack is fixedly mounted on the placement platform, and the tracer gas cylinder is placed in the first gas cylinder rack; the tracer gas cylinder stores a tracer; The tracer gas cylinder is connected to the inlet of the first mass flow meter through the first pressure reducing valve and the first solenoid valve in sequence; the outlet of the first mass flow meter is connected to the release pipe through the tee in sequence; The release pipe extends into the interior of the fixed pollution source flue through the first opening, perpendicular to the flue gas flow direction; the first opening is sealed; The smoke drainage device comprises: a drainage pipe, a suction pump, a second mass flow meter, a second solenoid valve and a plurality of connecting pipelines; The end of the drainage pipe extends into the interior of the fixed pollution source flue through the second opening; the second opening is sealed; The starting end of the drainage pipe is connected to the inlet of the vacuum pump; the outlet of the vacuum pump is connected to the inlet of the second mass flow meter; the outlet of the second mass flow meter is connected to the three-way connection of the tracer gas release device via the second solenoid valve, and flows into the fixed pollution source flue through the release pipe.

2. The fixed pollution source flow in-situ calibration device according to claim 1 is characterized in that: The end of the release pipe is sealed, and a plurality of release pipe holes are evenly distributed on both sides perpendicular to the direction of smoke flow.

3. The fixed pollution source flow in-situ calibration device according to claim 2 is characterized in that: The measuring and analyzing device comprises: a tracer concentration analyzer, a drying tube, a calibration standard gas cylinder, a second pressure reducing valve, a third solenoid valve, a second gas cylinder stand, a reversing valve, a third mass flow meter, a flue gas sampling pipeline and a plurality of connecting pipelines; The inlet of the tracer concentration analyzer is connected to the reversing valve via the third mass flow meter and the drying pipe in sequence; The second gas cylinder rack is fixedly mounted on the placement platform, and the calibration standard gas cylinder is placed in the second gas cylinder rack; the calibration standard gas cylinder stores calibration standard gas; the calibration standard gas is used to calibrate the tracer concentration analyzer; The gas outlet of the calibration standard gas cylinder is connected to the reversing valve via the second pressure reducing valve and the third solenoid valve in sequence; the reversing valve is connected to the starting end of the flue gas sampling pipeline; the end of the flue gas sampling pipeline extends into the interior of the fixed pollution source flue through the third opening, and the sampling point is located at the flow monitoring section; the third opening is sealed.

4. The fixed pollution source flow in-situ calibration device according to claim 3 is characterized in that: The control system includes: an industrial computer, a real-time controller, a control drive circuit, a data acquisition device, a DC regulated power supply and a number of data connection lines; The industrial computer communicates with the real-time controller to receive data collected by the real-time controller and send dynamic control instructions for each valve to the real-time controller; The real-time controller is connected to the control drive circuit and is used to complete digital I / O control and signal acquisition of the mass flow meter and the tracer concentration analyzer through digital logic, and output the signal to the control drive circuit; and is also used to work based on the data collected by the data collector; The control drive circuit is connected to the first solenoid valve, the second solenoid valve and the third solenoid valve respectively, and is used to complete the start and stop of the measurement and the solenoid valve drive as well as the current signal backtest; The data collector is used to collect and process the mass flow meter and tracer concentration parameters; The DC regulated power supply supplies power to the first solenoid valve, the second solenoid valve, the third solenoid valve, the reversing valve, the first mass flowmeter, the second mass flowmeter and the third mass flowmeter through the control drive circuit.

5. A method for in-situ calibration of a fixed pollution source flow rate, which is implemented based on the fixed pollution source flow rate in-situ calibration device according to any one of claims 1 to 4, and is characterized in that: The fixed pollution source flow in-situ calibration method comprises: Obtaining tracer release flow data and tracer concentration analyzer measurement signals within a calibration period; Get the flow to be calibrated within the calibration time; The correction coefficient is calculated based on the tracer release flow rate data within the calibration time, the tracer concentration analyzer measurement signal, and the flow rate to be calibrated within the calibration time.

6. The method for in-situ calibration of fixed pollution source flow according to claim 5, characterized in that: Before obtaining the tracer release flow data and the tracer concentration analyzer measurement signal within the calibration time, the fixed pollution source flow in-situ calibration method further includes: The calibration standard gas cylinder is connected to the tracer concentration analyzer by using a reversing valve; the calibration standard gas inlet flow rate is adjusted by a third mass flow meter, the tracer concentration analyzer is calibrated, and a calibration standard gas signal is obtained; The flue gas sampling pipeline is connected to the tracer concentration analyzer by using a reversing valve to measure the tracer background concentration in the flue of the fixed pollution source; The tracer release flow rate is adjusted according to the tracer background concentration, and when the tracer concentration analyzer measurement signal is close to the calibration standard gas signal, the tracer release flow rate is fixed.

7. The method for in-situ calibration of fixed pollution source flow according to claim 6, characterized in that: The correction coefficient is calculated based on the tracer release flow data within the calibration time, the tracer concentration analyzer measurement signal, and the flow to be calibrated within the calibration time, specifically including: Calculating the standard flow rate within the calibration time according to the tracer release flow rate data within the calibration time and the concentration measurement signal of the tracer concentration analyzer; Calculate the average value of the standard flow rate within the calibration time; According to the flow to be calibrated within the calibration time, an average value of the flow to be calibrated within the calibration time is calculated; The correction coefficient is calculated based on the average value of the standard flow rate within the calibration time and the average value of the flow rate to be calibrated within the calibration time.

8. The method for in-situ calibration of fixed pollution source flow according to claim 7, characterized in that: The fixed pollution source flow in-situ calibration method also includes: status check; the status check includes: air tightness check of the pipelines of the tracer gas release device, the smoke drainage device and the calibration device to ensure good air tightness; check that the tracer concentration analyzer, the industrial computer, the real-time controller, the control drive circuit, the data acquisition device and the DC regulated power supply can all work normally.

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