CN219657591U - Automatic calibration device based on gaseous pollutant monitoring system - Google Patents
Automatic calibration device based on gaseous pollutant monitoring system Download PDFInfo
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- CN219657591U CN219657591U CN202320457875.9U CN202320457875U CN219657591U CN 219657591 U CN219657591 U CN 219657591U CN 202320457875 U CN202320457875 U CN 202320457875U CN 219657591 U CN219657591 U CN 219657591U
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 93
- 239000003344 environmental pollutant Substances 0.000 title claims abstract description 36
- 231100000719 pollutant Toxicity 0.000 title claims abstract description 36
- 238000005070 sampling Methods 0.000 claims abstract description 61
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 51
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims description 36
- 238000010790 dilution Methods 0.000 claims description 33
- 239000012895 dilution Substances 0.000 claims description 33
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 25
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 17
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 17
- 239000007789 gas Substances 0.000 abstract description 139
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000009423 ventilation Methods 0.000 abstract description 3
- 239000003570 air Substances 0.000 description 10
- 239000012080 ambient air Substances 0.000 description 8
- 238000012423 maintenance Methods 0.000 description 7
- 238000003908 quality control method Methods 0.000 description 7
- 239000000356 contaminant Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Sampling And Sample Adjustment (AREA)
Abstract
The utility model discloses an automatic calibration device based on a gaseous pollutant monitoring system, which comprises an air passage reverse control device and a standard gas generating device, wherein the air passage reverse control device is provided with a feeding pipeline, one end of the feeding pipeline is connected with the standard gas generating device, the other end of the feeding pipeline is provided with a plurality of first pipelines, the first pipelines are respectively provided with a first branch and a second branch, the first branch is communicated with a monitoring analysis device of the gaseous pollutant monitoring system, and the second branch is communicated with a through hole of a sampling air passage device; the first pipeline is provided with a flow controller. According to the automatic calibration device provided by the utility model, the ventilation path of the calibration gas is optimized, and the convenience and accuracy of system calibration are improved by controlling the circulation of different gases, so that the measurement precision and accuracy of the gaseous pollutant on-line monitoring system are improved, and the risk of gas leakage is reduced.
Description
Technical Field
The utility model relates to the technical field of gas monitoring, in particular to an automatic calibration device based on a gaseous pollutant monitoring system.
Background
In the technical field of gas monitoring, when environmental monitoring stations and scientific research units at all levels monitor several common gaseous pollutants in the atmosphere, an online monitoring system for the gaseous pollutants in the ambient air is most commonly used, and the existing atmospheric pollutants are monitored online in real time.
However, the online monitoring system has the problems of zero drift, reduced measurement accuracy, poor stability and the like due to the continuous startup and operation in a constant period. Therefore, each gas analyzer needs to be calibrated regularly to ensure the reliability and accuracy of the data. During calibration analysis, the system typically needs to stop sampling work and purge the sample gas from the tubing within the system, adding to the instrument workload.
The current method adopts manual calibration, and is high in calibration frequency, long in calibration time, and more in manpower and time; the other is the self-contained system calibration of the instrument, and the existing instrument cannot be flexibly suitable for gas calibration exceeding the system configuration because of the fixed configuration of the calibration pipelines, valves and the like of the instrument and the changeable pollutant targets to be actually monitored.
Additionally, in the prior art, when the system is calibrated, the calibration gas may enter the instrument through the sampling backbone tubing. The inner diameter of the sampling central pipeline is thick, the pipeline is long, the volume inside the pipeline is large, the time and the consumption of the calibration gas entering the instrument through the central pipeline are long, and the analysis instrument can reach a stable value only after a longer time; if the sampling central pipeline leaks, inaccurate calibration can be caused, and the risk of high-concentration standard gas leakage can also be caused.
Disclosure of Invention
According to the automatic calibration device based on the gaseous pollutant monitoring system, the gas path reverse control device is arranged, the ventilation path of the calibration gas is optimized, and the ventilation of different calibration gases is controlled, so that the convenience and the accuracy of system calibration are improved, the measurement precision and the accuracy of the gaseous pollutant online monitoring system are further improved, and the risk of harmful gas leakage is reduced.
The utility model provides a gaseous pollutant-based monitoring system which comprises a sampling device, a sampling gas circuit device, a monitoring analysis device, an automatic calibration device and a calculation control device.
The sampling device comprises a sampling head and a sampling control system, the sampling head is connected with a first end of the sampling gas circuit device, and the sampling control system is connected with a second end of the sampling gas circuit device; the sampling gas circuit device is provided with a plurality of through holes.
The automatic calibration device comprises a gas path back control device and a standard gas generating device; the gas circuit reverse control device is provided with a feeding pipeline, one end of the feeding pipeline is connected with the standard gas generating device, the other end of the feeding pipeline is provided with a plurality of first pipelines, the first pipelines are respectively provided with a first branch and a second branch, the first branch is communicated with the monitoring analysis device, and the second branch is communicated with a through hole of the sampling gas circuit device; the gas circuit reverse control device is electrically connected with the standard gas generating device.
Preferably, the gas path back control device is electrically connected with the standard gas generating device through a wiring terminal.
Preferably, the first pipeline is provided with a flow controller.
Preferably, the flow controller is a solenoid valve or a three-way valve.
Preferably, the automatic calibration device comprises a first number of first pipelines, the sampling gas path device (2) is provided with a second number of through holes, and the first number is larger than or equal to the second number.
Preferably, the first pipeline is provided with a filter, and the filter is located in at least one pipeline of the through hole, the first branch and the second branch.
Preferably, the first pipeline is provided with a filter, and the filter is located in the first branch and/or the second branch.
Preferably, the standard gas generating device comprises a dynamic dilution calibration device, a standard gas storage device, a zero gas generating device and a gas power control device, wherein the dynamic dilution calibration device, the zero gas generator and the gas power control device are sequentially communicated, and the standard gas storage device is communicated with the dynamic dilution calibration device.
Preferably, the standard gas storage device (422) comprises at least one of a carbon monoxide storage chamber, a sulfur dioxide storage chamber and a nitric oxide gas storage chamber.
Preferably, the dynamic dilution calibration device is provided with an ozone generator.
Preferably, the automatic calibration device is provided with a wireless signal receiving device and a wiring port, and the automatic calibration device is connected with the computer control device in a wired or wireless way. The calculation control device is connected with the monitoring analysis device and the automatic calibration device and is used for controlling the operation of the monitoring analysis device and the automatic calibration device and the data acquisition of the calibration process, so that instrument operation and maintenance personnel can judge whether the instrument is normal in operation or not and whether the quality control of the monitoring data meets the standard or not by observing the data of the calibration process.
The automatic calibration device based on the gaseous pollutant monitoring system provided by the utility model has the following beneficial effects:
according to the automatic calibration device, the gas circuit reverse control system is arranged, when the system is calibrated, the sampling gas circuit device is not required to be closed, zero gas or standard gas is not fed into the corresponding monitoring analysis device through the gas circuit reverse control device, so that the stable time of the system during calibration is saved, the consumption of the standard gas is reduced, the risk of air leakage caused by feeding the standard gas into the sampling gas circuit device is reduced, and the calibration is safer and more convenient; the automatic calibration device designed by the utility model is suitable for one or more gaseous pollutant monitoring systems, the first pipeline number of the feeding pipelines can be determined according to the pollutant type number in the ambient air to be tested, and the flow controller can control the circulation of different gases to perform targeted calibration, so that the system calibration is more controllable and more accurate; the flow controller is connected with the dynamic dilution calibration device through a circuit containing a wiring terminal, so that the flow controller can be controlled by a computer through a preset program control module, and the operation of the flow controller can be manually interfered, so that the operation is more convenient.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an automatic calibration device based on a gaseous pollutant monitoring system according to an embodiment of the present utility model.
The following supplementary explanation is given to the accompanying drawings: 11 sampling heads; 12 sampling control system; 2, sampling the gas circuit device; 31-34 monitoring an analyzer; 421 dynamic dilution calibration means; 422 standard gas storage device; 423 zero gas generating device; 424 a gas power control device; 43 a feeding pipeline; 431 a first leg; 432 second leg; 441-444 solenoid valves; 5, calculating a control device; and 6, connecting terminals.
Detailed Description
In order to enable those skilled in the art to better understand the present utility model, the following description will make clear and complete descriptions of the technical solutions according to the embodiments of the present utility model with reference to the accompanying drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the utility model. In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "top", "bottom", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may include one or more of the feature, either explicitly or implicitly. Moreover, the terms "first," "second," and the like, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein.
The following describes the technical scheme in the embodiment of the utility model with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an automatic calibration device based on a gaseous pollutant monitoring system according to an embodiment of the present utility model, where the gaseous pollutant monitoring system in fig. 1 includes a sampling device 1, a sampling gas path device 2, a monitoring analysis device 3, an automatic calibration device 4 and a calculation control device 5. The automatic calibration device comprises a gas path back control device 41 and a standard gas generation device 42; the sampling device comprises a sampling head 11 and a sampling control system 12, wherein the sampling head 11 is connected with a first end of the sampling gas circuit device 2, and the sampling control system 12 is connected with a second end of the sampling gas circuit device 2; the sampling gas circuit device 2 is provided with a plurality of through holes; the gas circuit reverse control device 41 is provided with a feeding pipeline 43, one end of the feeding pipeline is connected with the standard gas generating device 42, the other end of the feeding pipeline is provided with a plurality of first pipelines, the first pipelines are provided with a first branch 431 and a second branch 432, the first branch 431 is communicated with the monitoring analysis device 31, and the second branch 432 is communicated with a through hole of the sampling gas circuit device 2. The gas circuit back control device 41 is electrically connected with the standard gas generating device 42.
The automatic calibration device 4 is provided with a wireless signal receiving device and a wiring port. The computer control device 5 is electrically connected with the monitoring and analyzing device 3, and is electrically connected with the automatic calibration device 4 or wirelessly connected with the automatic calibration device. The computer control device 5 is used for controlling the operation and data acquisition of the monitoring and analyzing device 3 and the automatic calibration device 4.
In some embodiments, the gas circuit back control device 41 and the standard gas generating device 42 are electrically connected through the connection terminal 6.
In some embodiments, the purpose of the plurality of through holes of the sampling gas path device 2 is to split the collected ambient air and feed the ambient air into different gas monitoring and analyzing devices 3 for analysis. A filter, such as a filtering membrane, is arranged at the through hole, so that coarse particles and the like in the ambient air can be filtered; may also be provided in the first branch 431 or the second branch 432; a filter device may also be provided in the monitoring and analyzing device 3 to ensure that the gas enters the monitoring and analyzing device without large-sized solid particles.
In some embodiments, the sampling gas circuit arrangement 2 is a sampling manifold.
In some embodiments, the feed line 43 of the gas circuit inverse control device is provided with a flow controller 44 based on an automated calibration device of the gaseous contaminant monitoring system, and the flow controller 44 is electrically connected to the standard gas generating device 42. The flow controller can control the opening and closing of the feeding pipeline 43, and further control the disconnection and connection of the standard gas generating device 42 and the feeding pipeline 43, so as to realize electric control on whether the standard gas flows to the feeding pipeline 43, and further control on whether the gas calibration is started. And double control of the operation of the reverse control gas circuit and the gas calibration opening is realized.
The flow controller 44 may be, for example, any one of a solenoid valve and a three-way valve having an opening/closing function controlled by an electric circuit.
When the gaseous pollutant monitoring system performs sampling work, the flow controller closes the first pipeline of the feeding pipeline, and ambient air enters the sampling gas circuit device 2 from the sampling head 11, so that pollutants cannot pass through the first pipeline because the first pipeline is in a closed state. The gaseous pollutants thus pass from the second branch 432 of the feed line into the first branch 431 and further to the monitoring and analysis device 3 for analysis.
Because the gas flow rate in the sampling gas circuit device 2 is far greater than the gas flow rates in the pipelines of the second branch 432 and the first branch 431, the sampling control system 12, namely the sampling fan, does not need to be closed when the system performs calibration work, and the pressure difference of the gas in the pipeline enables zero gas or standard gas to not enter the sampling gas circuit device 2 from the second branch 432. At the beginning of calibration, the first pipeline of the feeding pipeline is opened by the flow controller, and zero gas or calibration gas passes through the flow controller 44 to reach the monitoring and analyzing device 3 for calibration.
The monitoring and analyzing device can be one or more of an ozone analyzer, a carbon monoxide analyzer, a sulfur dioxide analyzer and a nitrogen oxide analyzer.
In some embodiments, the standard gas generator 42 includes a dynamic dilution calibration device 421, a standard gas storage device 422, a zero gas generator 423, and a gas power control device 424; the dynamic dilution calibration device 421, the zero gas generator 423 and the gas power control device 424 are connected in sequence, and the standard gas storage device 422 is communicated with the dynamic dilution calibration device 421. The standard gas storage device 422 comprises at least one of carbon monoxide, sulfur dioxide and nitric oxide gas storage devices, each independently stored; the dynamic dilution calibration device 421 is provided with an ozone generator. The standard gas corresponds to the gaseous pollutant to be monitored, or the ozone analyzer, the carbon monoxide analyzer, the sulfur dioxide analyzer and the nitrogen oxide analyzer of the monitoring and analyzing device correspond to each other.
It should be noted that, because gaseous pollution sources in the atmosphere have diversity, the preset monitoring device and the preset standard gas are determined according to actual conditions, and the preset monitoring device and the preset standard gas are not limited in the utility model. Different environmental monitoring stations or scientific research institutions of different levels also have different monitoring management regulations, and the requirements on the calibration frequency and the calibration content (including zero point calibration and single point calibration with different concentrations) of the atmospheric pollutant monitoring analyzer are different.
The working principle of the automatic calibration device based on the gaseous pollutant monitoring system of the utility model is described below by means of different embodiments:
example 1
As described in fig. 1, in the case of a conventional calibration requirement, the interval between the zero point calibration and the specified concentration point calibration is set by the computer control device 5, and the stable value of the specified gas is set. Wherein the specified concentration of ozone, sulfur dioxide and nitrogen oxides is 500ppb, and the specified concentration of carbon monoxide is 10ppm.
When the system performs sampling work, the first pipeline is closed, the sampling head 11 and the sampling fan 12 are opened, and ambient air enters the sampling air path device 2 from the sampling head 11. Since the contaminants cannot pass through the first conduit in the closed state, the gaseous contaminants pass through the second branch 432 of the feed conduit into the first branch 431 and then to the monitoring and analyzing device 3 for analysis.
When the set calibration time is reached, the system starts the calibration work without closing the sampling air path device 2 and the sampling fan 12, and the specific operation is as follows: (1) The first pipeline is opened, and clean air (zero gas) free of pollutants such as ozone and the like is conveyed to the feeding pipeline by the standard gas generating device. Because the gas flow rate in the sampling gas circuit device 2 is far greater than the gas flow rates in the first branch 321 and the second branch 432, the pressure difference of the gas in the feeding pipeline makes zero gas unable to enter the sampling gas circuit device 2 from the second branch 432, so that the zero gas enters the first pipeline and the first branch 431 through the feeding pipeline 43, and then reaches the monitoring analysis device 3 for zero calibration. Under this condition, when the computer control device 5 controls and recognizes that the fluctuation value of the real-time monitoring data of the monitoring analyzer 3 does not exceed 1ppb, the value is considered to be stable, and the zero point calibration is ended.
After the zero point calibration operation is completed, the computer control device 5 controls the standard gas generating device 42 to supply the standard gas of a predetermined concentration to the monitoring and analyzing device 3. When the fluctuation value of the real-time monitoring data of the monitoring and analyzing device reaches the stable value of the specified gas, the single-point calibration is finished. The calibration operation ends up.
Example two
Under the conventional calibration requirement, each monitoring analysis device is set to perform zero point and specified concentration point calibration every seven days.
The specific operation is as follows: (1) The electromagnetic valve 441 connected with the ozone monitoring analyzer 31 is controlled by the computing control device 5 to be switched to be communicated with the first pipeline of the feeding pipeline, and clean air is firstly introduced by the zero gas generator 423, so that pollutants such as ozone and the like are not contained. The dynamic dilution calibrator gas outlet is communicated with the electromagnetic valve 441 and then is communicated with the pipeline of the ozone analyzer. Under the condition, when the computer module controls and recognizes that the fluctuation value of the real-time monitoring data of the ozone monitoring analyzer is not more than 1ppb, the numerical value is considered to be stable. The stable value is recorded by the calculation control device, so that an instrument operation and maintenance person can judge whether the zero drift of the instrument is in a normal range or not after checking, and further whether the quality control of the recently monitored data of the instrument reaches the standard or not is evaluated. At the moment, the computer module controls the dynamic dilution calibrator to adjust the gain coefficient of the ozone analyzer to enable the real-time value of the ozone to be displayed as 0, and then zero calibration is finished.
The electromagnetic valve 441 connected with the ozone monitoring analyzer 31 is controlled by the computing control device 5 to be switched to be communicated with the first pipeline of the feeding pipeline, clean air is firstly introduced by the zero gas generator, and pollutants such as ozone and the like are not contained. The dynamic dilution calibrator gas outlet is communicated with the electromagnetic valve 441 and then is communicated with the pipeline of the ozone analyzer. Under this condition, when the calculation control means 5 controls and recognizes that the fluctuation value of the real-time monitoring data of the ozone monitoring analyzer 31 does not exceed 1ppb, the numerical value is considered stable. The stable value is recorded by the calculation control device 5 so that an instrument operation and maintenance person can judge whether the zero drift of the instrument is in a normal range after checking, and therefore whether the quality control of the recently monitored data of the instrument meets the standard is evaluated. At this time, the calculation control device 5 controls the dynamic dilution calibrator 421 to adjust the gain coefficient of the ozone analyzer so that the real-time ozone value is displayed as 0, and the zero calibration is finished.
(2) After the step (1) is finished, the calculation control device 5 controls the dynamic dilution calibrator 421 to introduce 500ppb of ozone standard gas into the ozone monitoring analyzer 31, and when the fluctuation value of the real-time monitoring data of the ozone analyzer is recognized to be not more than 10ppb, the numerical value is considered to be stable. The stable value is recorded by the calculation control device, so that an instrument operation and maintenance person can judge whether the zero drift of the instrument is in a normal range or not after checking, and further whether the quality control of the recently monitored data of the instrument reaches the standard or not is evaluated. At this time, the calculation control device 5 controls the gain factor of the dynamic dilution calibrator 421 so that the real-time ozone value is displayed as 500ppb, and the single-point calibration is completed. The calibration of the ozone monitoring analyzer has been completed.
Example III
The electromagnetic valve 442 connected with the carbon monoxide monitoring analyzer 32 is controlled by the computing control device 5 to be switched to be communicated with the first pipeline of the feeding pipeline, and clean air is introduced from the zero gas generator, so that pollutants such as carbon monoxide and the like are avoided. The air outlet of the dynamic dilution calibrator 421 is communicated with the electromagnetic valve 442 through the feeding pipeline 43, and the first pipeline of the feeding pipeline is communicated with the first branch 431 to lead zero gas to the carbon monoxide monitoring analyzer 32. Under this condition, when the calculation control device 5 recognizes that the fluctuation value of the real-time monitoring data of the carbon monoxide analyzer is not more than 0.05ppm, the numerical value is considered to be stable. The stable value is recorded by the calculation control device, so that an instrument operation and maintenance person can judge whether the zero drift of the instrument is in a normal range or not after checking, and further whether the quality control of the recently monitored data of the instrument reaches the standard or not is evaluated. At this time, the calculation control device 5 commands the dynamic dilution calibrator 421 to adjust the gain factor of the ozone analyzer so that the real-time carbon monoxide value is displayed as 0, and the zero calibration is completed.
After the zero point calibration is finished, the calculation control device 5 instructs the dynamic dilution calibrator 421 to introduce 10ppm of carbon monoxide standard gas into the carbon monoxide monitoring analyzer 32, when the calculation control device 5 recognizes that the fluctuation value of the real-time monitoring data of the carbon monoxide analyzer 32 is not more than 0.5ppm, the numerical value is considered to be stable, at the moment, the calculation control device 5 instructs the dynamic dilution calibrator 421 to adjust the gain coefficient of the carbon monoxide monitoring analyzer, so that the real-time numerical value of the carbon monoxide is displayed as 0.5ppm, and then the single point calibration is finished. The calibration of the carbon monoxide monitoring analyzer has been completed.
Example IV
The electromagnetic valve 443 connected with the sulfur dioxide monitoring analyzer 33 is controlled by the computing control device 5 to be communicated with the first pipeline of the feeding pipeline, and clean air is firstly introduced from the zero gas generator, so that pollutants such as sulfur dioxide and the like are not contained. The dynamic dilution calibrator gas outlet to solenoid valve 443 is connected via feed line 43, and the feed line first line is connected to first branch 431 to feed zero gas to sulfur dioxide monitoring analyzer 33. Under this condition, when the calculation control device 5 recognizes that the fluctuation value of the real-time monitoring data of the sulfur dioxide analyzer is not more than 0.05ppm, the numerical value is considered to be stable. The stable value is recorded by the calculation control device, so that an instrument operation and maintenance person can judge whether the zero drift of the instrument is in a normal range or not after checking, and further whether the quality control of the recently monitored data of the instrument reaches the standard or not is evaluated. At this time, the calculation control device 5 commands the dynamic dilution calibrator to adjust the gain coefficient of the sulfur dioxide monitoring analyzer, so that the real-time numerical value of the sulfur dioxide is displayed as 0, and the zero calibration is finished.
After the zero point calibration is finished, the calculation control device 5 instructs the dynamic dilution calibrator 421 to introduce 10ppm of sulfur dioxide standard gas into the sulfur dioxide monitoring analyzer 33, when the calculation control device 5 recognizes that the fluctuation value of the real-time monitoring data of the sulfur dioxide monitoring analyzer does not exceed 0.5ppm, the value is considered to be stable, at the moment, the calculation control device 5 instructs the dynamic dilution calibrator 421 to adjust the gain coefficient of the sulfur dioxide monitoring analyzer 33, so that the real-time value of the sulfur dioxide is displayed as 0.5ppm, and then the single point calibration is finished. The calibration of the sulfur dioxide monitoring analyzer is completed.
Example five
The electromagnetic valve 444 connected with the nitrogen oxide monitoring analyzer 34 is controlled by the calculation control device 5 to be switched to be communicated with the first pipeline of the feeding pipeline, and clean air is introduced from the zero gas generator, so that pollutants such as nitrogen oxides are not contained. The dynamic dilution calibrator gas outlet to solenoid valve 444 communicates through the feed line, the first pipeline of the feed line communicates with first branch road, let zero gas to monitor the analyzer to nitrogen oxide. Under this condition, when the calculation control device 5 recognizes that the fluctuation value of the real-time monitoring data of the nitrogen oxide monitoring analyzer is not more than 0.05ppm, the numerical value is considered to be stable. The stable value is recorded by the calculation control device, so that an instrument operation and maintenance person can judge whether the zero drift of the instrument is in a normal range or not after checking, and further whether the quality control of the recently monitored data of the instrument reaches the standard or not is evaluated. At this time, the calculation control device 5 commands the dynamic dilution calibrator to adjust the gain coefficient of the nitrogen oxide monitoring analyzer, so that the real-time nitrogen oxide value is displayed as 0, and the zero calibration is finished.
After the zero point calibration is finished, the calculation control device 5 commands the dynamic dilution calibrator to introduce 10ppm of nitrogen oxide standard gas into the nitrogen oxide monitoring analyzer, when the calculation control device 5 recognizes that the fluctuation value of the real-time monitoring data of the nitrogen oxide monitoring analyzer is not more than 0.5ppm, the calculation control device 5 commands the dynamic dilution calibrator to adjust the gain coefficient of the nitrogen oxide monitoring analyzer, the real-time value of the nitrogen oxide is displayed as 0.5ppm, and the single point calibration is finished. The calibration of the nitrogen oxide monitoring analyzer has been completed.
According to the automatic calibration device based on the gaseous pollutant monitoring system, the gas circuit reverse control system is arranged, the sampling gas circuit device is not required to be closed during system calibration, standard gas can be introduced into the corresponding monitoring analysis device through the gas circuit reverse control device without passing through the sampling gas circuit device containing more sampling gas, the stable time of the system during calibration is saved, the consumption of the standard gas is reduced, the risk of gas leakage caused by introducing the standard gas into the sampling gas circuit device is reduced, and the calibration is safer and more convenient; the automatic calibration device designed by the utility model is suitable for one or more gaseous pollutant monitoring systems, the number of the first branches of the feeding pipeline can be determined according to the number of pollutant types in the ambient air to be tested, and the flow controller can conduct targeted calibration by controlling the circulation of different gases, so that the system calibration is more controllable and more accurate; the fluid flow controller is connected with the dynamic dilution calibration device through a circuit containing a wiring terminal, so that the electromagnetic valve can be controlled by a computer control module, and the operation of the electromagnetic valve can be manually interfered, so that the operation is more convenient.
The foregoing is only illustrative of the present utility model and is not to be construed as limiting thereof, but rather as various modifications, equivalent arrangements, improvements, etc., within the spirit and principles of the present utility model.
Claims (10)
1. An automatic calibration device based on a gaseous pollutant monitoring system, wherein the gaseous pollutant monitoring system comprises a sampling device, a sampling gas circuit device (2), a monitoring analysis device, an automatic calibration device and a calculation control device (5), and the sampling gas circuit device (2) is provided with a plurality of through holes; the automatic calibration device is characterized by comprising a gas path back control device and a standard gas generation device;
the gas circuit reverse control device is provided with a feeding pipeline (43), one end of the feeding pipeline is connected with the standard gas generating device, the other end of the feeding pipeline (43) is provided with a plurality of first pipelines, the first pipelines are provided with a first branch (431) and a second branch (432) in a separated mode, the first branch (431) is communicated with the monitoring analysis device, and the second branch (432) is communicated with a through hole of the sampling gas circuit device (2);
the gas circuit reverse control device is electrically connected with the standard gas generating device.
2. The automatic calibration device according to claim 1, characterized in that the gas circuit back-control device and the standard gas generating device are electrically connected by means of a connection terminal (6).
3. The automatic calibration device according to claim 1, wherein a flow controller (44) is provided on the first pipeline, one end of the flow controller (44) is respectively communicated with the first branch (431) and the second branch (432), and the other end of the flow controller (44) is communicated with the standard gas generating device.
4. An automated calibration apparatus according to claim 3, wherein the flow controller is a solenoid valve or a three-way valve.
5. The automated calibration apparatus of any one of claims 1-4, wherein the automated calibration apparatus comprises a first number of the first conduits, the sampling gas path apparatus (2) being provided with a second number of through holes, the first number being greater than or equal to the second number.
6. The automated calibration device according to any one of claims 1-4, characterized in that the first line is provided with a filter, which is located in the first branch (431) and/or the second branch (432).
7. The automated calibration apparatus of any one of claims 1-4, wherein the standard gas generator comprises a dynamic dilution calibration apparatus (421), a standard gas storage apparatus (422), a zero gas generator (423), and a gas power control apparatus (424), the dynamic dilution calibration apparatus, the zero gas generator, and the gas power control apparatus being in communication in sequence, the standard gas storage apparatus being in communication with the dynamic dilution calibration apparatus.
8. The automated calibration apparatus of claim 7, wherein the standard gas storage device (422) comprises at least one of a carbon monoxide storage chamber, a sulfur dioxide storage chamber, and a nitric oxide gas storage chamber.
9. The automated calibration device according to claim 7, characterized in that the dynamic dilution calibration device (421) is provided with an ozone generator.
10. The automated calibration apparatus of any one of claims 1-4, wherein the automated calibration apparatus is provided with a wireless signal receiving device and a wiring port, the automated calibration apparatus being connected wirelessly or by wire to a computer control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320457875.9U CN219657591U (en) | 2023-03-10 | 2023-03-10 | Automatic calibration device based on gaseous pollutant monitoring system |
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