CN114660241A

CN114660241A - Online intelligent calibration system of ambient gas analyzer

Info

Publication number: CN114660241A
Application number: CN202210317838.8A
Authority: CN
Inventors: 王德发; 叶菁; 刘沂玲; 王彦武
Original assignee: National Institute of Metrology; Henan Relations Co Ltd
Current assignee: National Institute of Metrology; Henan Relations Co Ltd
Priority date: 2022-03-29
Filing date: 2022-03-29
Publication date: 2022-06-24

Abstract

The invention discloses an online intelligent calibration system of an environmental gas analyzer, which relates to the field of instrument calibration, and the on-site calibration system in the system comprises: the system comprises a system control module, and a gas standard substance containing device, a standard gas dynamic preparation module and a gas circuit control module which are connected with the system control module; the system control module is used for controlling the gas circuit control module to switch working modes, controlling the standard gas dynamic preparation module to prepare standard gas with different concentrations, adjusting parameters of the environment gas analyzer to be corrected, correcting gas concentration indicating values of an environment air sample, verifying parameters of a linear regression curve and verifying stability of the environment gas analyzer to be corrected. The invention realizes the automatic calibration of the environmental gas analyzer and can improve the calibration efficiency and the calibration accuracy of the environmental gas analyzer.

Description

Online intelligent calibration system of environmental gas analyzer

Technical Field

The invention relates to the field of instrument calibration, in particular to an online intelligent calibration system for an environmental gas analyzer.

Background

Gaseous contaminants are contaminants that exist in a molecular state at normal, atmospheric pressure. Among the gaseous pollutants that are of general interest in environmental air pollution control are sulfur dioxide, nitrogen oxides, carbon monoxide, and other gaseous organic compounds. The environment gas analyzer is mainly used for analyzing the content of gaseous pollutants in the environment air in real time and accurately. The environmental gas analyzer needs to be calibrated at regular intervals in the use process so as to ensure the accuracy of the indication value of the analyzer.

At present, the calibration of the environmental gas analyzer still adopts the traditional field manual operation mode, and the operation mode is as follows: the standard substance of certain gas and the zero gas are mixed by a manual dilution device to prepare standard gas with target concentration, then the standard gas is connected into an instrument to be calibrated through a pipeline, and the accuracy of the indicating value of the instrument is judged by comparing the indicating value of the instrument with the difference value of the prepared concentration of the standard gas. When the difference value exceeds the quality control requirement, the instrument needs to be calibrated, namely, the instrument is manually adjusted according to the difference value, so that the indicating value of the instrument is consistent with the concentration value prepared by the standard gas. Sometimes, during the calibration process, in order to obtain the linearity of the instrument, standard gases with different concentrations are prepared to carry out calibration measurement.

In the field of environmental gas detection, gas components are of interest, such as SO₂、NO_xCO, etc. The above manual procedure is repeated for each gas composition analyzer to be calibrated. Moreover, due to the different stability of the instruments, the instruments need to be calibrated regularly, even frequently, in order to obtain accurate measurement results. Adopt traditional manual calibration, not only complex operation, waste time and energy, trace to source untimely, data authenticity and validity can not obtain strong assurance, but also need use manpower to watch regularly to because too much manual operation, introduce human error easily, misoperation or data are made fake even. Therefore, the calibration efficiency and calibration accuracy of the conventional ambient gas analyzer need to be improved.

Disclosure of Invention

Based on this, the embodiment of the invention provides an online intelligent calibration system for an environmental gas analyzer, so as to improve the calibration efficiency and the calibration accuracy of the environmental gas analyzer.

In order to achieve the purpose, the invention provides the following scheme:

an online intelligent calibration system of an ambient gas analyzer, comprising: a field end calibration system; the field end calibration system comprises: the system comprises a system control module, and a gas standard substance containing device, a standard gas dynamic preparation module and a gas circuit control module which are connected with the system control module;

the gas standard substance containing device is communicated with the standard gas dynamic preparation module; the standard gas dynamic configuration module is respectively communicated with the gas circuit control module and a zero gas source in the calibrated instrument system; the gas circuit control module is respectively communicated with a calibrated environmental gas analyzer in the calibrated instrument system and a sampling pipe in the calibrated instrument system;

the system control module is configured to:

controlling the gas circuit control module to switch the working mode; the working mode comprises a calibration mode and a measurement mode;

controlling the standard gas dynamic preparation module to dilute the gas standard substance conveyed by the gas standard substance containing device by using the clean gas conveyed by the zero gas source to obtain standard gases with different concentrations;

in the calibration mode, controlling the gas circuit control module to input the clean gas or the standard gas with different concentrations to the calibrated environment gas analyzer, acquiring a gas concentration indicating value measured by the calibrated environment gas analyzer, and adjusting parameters of the calibrated environment gas analyzer according to the gas concentration indicating value and a corresponding standard value;

under the measurement mode, controlling the gas circuit control module to input an ambient air sample collected by the sampling pipe into the calibrated ambient gas analyzer, acquiring a gas concentration indicating value of the ambient air sample measured by the calibrated ambient gas analyzer, and correcting the gas concentration indicating value of the ambient air sample by adopting a linear regression curve; the linear regression curve represents the relationship between standard gases with different concentrations introduced into the calibrated environment gas analyzer and corresponding gas concentration indicating values measured by the calibrated environment gas analyzer;

in the calibration mode, verifying the parameters of the linear regression curve according to a set parameter control target;

in the calibration mode, verifying the stability of the calibrated environmental gas analyzer according to a relative standard deviation value and a set deviation control target; the relative standard deviation value is determined according to the clean gas introduced into the environment gas analyzer to be calibrated, the standard gas with different concentrations and the corresponding gas concentration indicating value measured by the environment gas analyzer to be calibrated.

Optionally, the system control module includes:

an automatic zero-span calibration module to:

in the calibration mode, controlling the gas circuit control module to input the clean gas to the calibrated environmental gas analyzer, acquiring a gas concentration indicating value measured by the calibrated environmental gas analyzer, and adjusting a zero point parameter of the calibrated environmental gas analyzer according to a difference value between the gas concentration indicating value and zero;

in the calibration mode, the gas circuit control module is controlled to input standard gases with different concentrations into the calibrated environment gas analyzer, a gas concentration indicating value measured by the calibrated environment gas analyzer is obtained, and a span parameter of the calibrated environment gas analyzer is adjusted according to a difference value between the gas concentration indicating value and a concentration value of the standard gas;

an auto-indication calibration module to:

under the measurement mode, controlling the gas circuit control module to input standard gases with different concentrations to the calibrated environment gas analyzer, acquiring gas concentration indicating values measured by the calibrated environment gas analyzer, and making a linear regression curve by using concentration values of the standard gases with different concentrations and corresponding gas concentration indicating values;

controlling the gas circuit control module to switch standard gas with different concentrations, which is introduced into the environment gas analyzer to be calibrated, into an environment air sample collected by the sampling pipe, acquiring a gas concentration indicating value of the environment air sample measured by the environment gas analyzer to be calibrated, and correcting the gas concentration indicating value of the environment air sample by adopting the linear regression curve;

an automatic linearity verification module to:

under the calibration mode, controlling the gas circuit control module to input standard gases with different concentrations to the calibrated environment gas analyzer, acquiring gas concentration indicating values measured by the calibrated environment gas analyzer, making a linear regression curve by the concentration values of the standard gases with different concentrations and the corresponding gas concentration indicating values, and determining parameters of the linear regression curve; the parameters include intercept, slope, and linear coefficients;

comparing the parameters with a set parameter control target to verify the parameters;

an automatic stability verification module to:

in the calibration mode, carrying out data acquisition operation for multiple times to obtain gas concentration indicating values of standard gases with different concentrations, which are measured by the calibrated environment gas analyzer, calculating a relative standard deviation value according to the gas concentration indicating values of the standard gases with different concentrations, and comparing the relative standard deviation value with a set deviation control target to verify the stability of the calibrated environment gas analyzer;

wherein the data collection operation is:

controlling the gas circuit control module to input the clean gas to the calibrated environmental gas analyzer to obtain a gas concentration indicating value measured by the calibrated environmental gas analyzer; and when the difference value between the gas concentration indicating value and zero is smaller than or equal to a set value, controlling the gas circuit control module to switch the clean gas introduced into the calibrated environment gas analyzer into standard gas with set concentration, and acquiring the gas concentration indicating value of the standard gas with set concentration measured by the calibrated environment gas analyzer.

Optionally, the online intelligent calibration system for the environmental gas analyzer further includes an on-site monitoring accessory;

the field monitoring auxiliary is connected with the system control module; the field monitoring auxiliary is used for acquiring real-time field information; the real-time field information comprises the temperature of a sampling pipe, the flow of the sampling pipe, the pressure in a gas standard substance containing device, whether the gas standard substance containing device leaks or not, an image of a drying agent in an instrument system to be calibrated, an image of a monitoring environment, the temperature of the monitoring environment, the humidity of the monitoring environment and the atmospheric pressure of the monitoring environment;

the system control module is also used for monitoring the gas standard substance containing device, the calibrated instrument system and the monitoring environment according to the real-time field information to obtain a monitoring result.

Optionally, the online intelligent calibration system for the environmental gas analyzer further includes: a data center;

the data center is connected with the system control module; and the data center is used for receiving the calibration result and the monitoring result sent by the system control module and sending alarm information according to the calibration result and the monitoring result.

Optionally, the online intelligent calibration system for the environmental gas analyzer further includes: a user side display system;

the user side display system is connected with the data center; and the user side display system is used for displaying the alarm information.

Optionally, the standard gas dynamic configuration module includes: the system comprises a gas preparation pipeline, a pressure regulating valve, a first gas mass flow controller, a second gas mass flow controller and a control unit;

the gas preparation pipeline is used for communicating the gas standard substance containing device with the gas circuit control module; the pressure regulating valve is arranged on the prepared gas pipeline; the pressure regulating valve is used for reducing the pressure of the gas standard substance to obtain the reduced-pressure gas standard substance; the first gas mass flow controller is used for controlling the flow of the depressurized gas standard substance introduced into the prepared gas pipeline; the second gas mass flow controller is used for controlling the flow of the clean gas introduced into the prepared gas pipeline; the control unit is respectively connected with the first gas mass flow controller, the second gas mass flow controller and the system control module; the control unit is used for selecting a preparation mode; the preparation mode comprises manual preparation and automatic matching.

Optionally, the gas path control module includes: the system comprises a first control gas pipeline, a second control gas pipeline, a first electromagnetic valve, a second electromagnetic valve and a programmable logic controller;

the standard gas dynamic preparation module is communicated with the calibrated environmental gas analyzer through the first control gas pipeline; the standard gas dynamic preparation module is communicated with the sampling pipe through the second control gas pipeline; the programmable logic controller is respectively connected with the first electromagnetic valve, the second electromagnetic valve and the system control module; the programmable logic controller is used for controlling the on-off states of the first electromagnetic valve and the second electromagnetic valve; the first electromagnetic valve is used for controlling the on-off of the first control gas pipeline; and the second electromagnetic valve is used for controlling the on-off of the second control gas pipeline.

Optionally, the field monitoring accessory includes:

the device comprises a sampling pipe temperature sensor, a sampling pipe flow sensor, a gas pressure sensor, a gas leakage sensor, a drying agent image sensor, an instrument image sensor, an indoor temperature sensor, an indoor humidity sensor and an indoor atmospheric pressure sensor;

the sampling pipe temperature sensor is used for acquiring the temperature of the sampling pipe; the sampling pipe flow sensor is used for collecting the flow of the sampling pipe; the gas pressure sensor is used for collecting the pressure in the gas standard substance containing device; the gas leakage sensor is used for determining whether the gas standard substance containing device leaks or not; the drying agent image sensor is used for acquiring an image of a drying agent in the calibrated instrument system; the instrument image sensor is used for acquiring an image of a monitored environment; the indoor temperature sensor is used for acquiring the temperature of a monitored environment; the indoor humidity sensor is used for acquiring the humidity of a monitored environment; the indoor atmospheric pressure sensor is used for acquiring atmospheric pressure of a monitored environment.

Optionally, the system control module is further configured to calculate a temperature difference between the temperature of the monitoring environment and a target temperature, and adjust the temperature of the environment where the calibrated ambient gas analyzer is located according to the temperature difference.

Optionally, the system control module further includes: a field end operation interface;

the field end operation interface is used for setting monitoring parameters; the monitoring parameters include calibration parameters and state control target parameters.

Compared with the prior art, the invention has the beneficial effects that:

the embodiment of the invention provides an online intelligent calibration system for an environmental gas analyzer, wherein a field end calibration system in the system comprises: the system comprises a system control module, and a gas standard substance containing device, a standard gas dynamic preparation module and a gas circuit control module which are connected with the system control module; the gas standard substance containing device is communicated with the standard gas dynamic preparation module; the standard gas dynamic configuration module is respectively communicated with the gas circuit control module and a zero gas source in the calibrated instrument system; the gas circuit control module is respectively communicated with a calibrated environmental gas analyzer in the calibrated instrument system and a sampling pipe in the calibrated instrument system; the system control module controls the standard gas dynamic preparation module to prepare standard gas with different concentrations, realizes the adjustment of parameters of the environment gas analyzer to be corrected, realizes the correction of gas concentration indicating values of an environment air sample, realizes the verification of parameters of a linear regression curve and realizes the verification of the stability of the environment gas analyzer to be corrected.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

Fig. 1 is a structural diagram of an online intelligent calibration system for an environmental gas analyzer according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

At present, a national environment air quality monitoring network is built with 5000 monitoring stations, and the positions of some stations are far away from urban areas, so that the traffic is inconvenient. The currently commonly used manual calibration frequency is zero-span calibration once a week, and linear calibration once a half year. When carrying out artifical calibration, just need drop into a large amount of fortune dimension personnel in order to satisfy the calibration requirement to fortune dimension cost also greatly increased, if adopt automatic calibration not only can improve the calibration frequency, also can reduce fortune dimension personnel quantity simultaneously, thereby great reduction fortune dimension cost. And related technical standards, such as HJ 818-2018 environmental air gaseous pollutants (SO)₂、NO₂、O₃CO) continuous automatic monitoring system operation and quality control code "suggests increasing the calibration frequency once a day, which is difficult to accomplish for monitoring sites with a large number of operation and maintenance by manual calibration methods. Based on this, this embodiment provides an online intelligent calibration system of environmental gas analysis appearance that can sample in real time, automatic intelligent calibration.

Referring to fig. 1, the online intelligent calibration system for the environmental gas analyzer of the present embodiment includes: a field end calibration system; the field end calibration system comprises: the system comprises a system control module, and a gas standard substance containing device, a standard gas dynamic preparation module and a gas circuit control module which are connected with the system control module.

The gas standard substance containing device is communicated with the standard gas dynamic preparation module; the standard gas dynamic configuration module is respectively communicated with the gas circuit control module and a zero gas source in the calibrated instrument system; the gas circuit control module is respectively communicated with a calibrated environmental gas analyzer (calibrated instrument) in the calibrated instrument system and a sampling pipe in the calibrated instrument system.

The system control module is configured to:

in the calibration mode, the gas circuit control module is controlled to input the clean gas or the standard gas with different concentrations into the calibrated environmental gas analyzer, a gas concentration indicating value measured by the calibrated environmental gas analyzer is obtained, and parameters of the calibrated environmental gas analyzer are adjusted according to the gas concentration indicating value and the corresponding standard value;

In one example, the calibrated instrument system generally comprises: the calibrated environmental gas analyzer is used for measuring the concentration of gaseous pollutants in the environmental air; the sampling pipe is used for guiding the outdoor ambient air sample to the calibrated ambient gas analyzer through the pipeline; a zero gas source for generating a clean gas free of gaseous contaminant impurities; the desiccant is equipped with some environmental gas analyzers to be calibrated (such as chemiluminescence nitrogen oxide analyzers) and is used for removing moisture in air and preventing indoor air containing excessive moisture from entering the instruments to be calibrated. The calibrated instrument system is usually placed indoors, and in order to keep the calibrated instrument at the normal working temperature, an air conditioner is usually installed indoors, can cool and heat, and regulates the indoor temperature to enable the indoor temperature to be within the normal working temperature range of the calibrated ambient gas analyzer.

In one example, the gas standard substance holding device comprises a gas cylinder cabinet and a gas cylinder placed in the gas cylinder cabinet; and a gas standard substance is placed in the gas cylinder. The gas standard substance containing device and the calibrated instrument system are synchronously stored in an indoor calibration site and are a source for tracing the measurement value of the calibrated environmental gas analyzer. The gas cylinder with the standard gas substance is placed in the gas cylinder cabinet, and the standard gas dynamic preparation module is connected with the gas cylinder cabinet through a gas pipeline.

In one example, the standard gas dynamic configuration module comprises: the device comprises a gas preparation pipeline, a pressure regulating valve, a first gas mass flow controller, a second gas mass flow controller and a control unit.

The gas preparation pipeline is used for communicating the gas standard substance containing device with the gas circuit control module and communicating the zero gas source with the gas circuit control module. The pressure regulating valve is arranged on the prepared gas pipeline; the pressure regulating valve is used for reducing the pressure of the bottled high-pressure gas of the gas standard substance to obtain the reduced-pressure gas standard substance, namely relatively low pressure, and then the reduced-pressure gas standard substance is connected to the first gas mass flow controller through a gas pipeline. The gas mass flow controller is mainly used for carrying out flow proportioning on a depressurized gas standard substance (high concentration) through a dilution gas from a zero gas source, diluting the gas standard substance into a low-concentration standard gas, and outputting the standard gas to the gas circuit control module through a gas pipeline, wherein the first gas mass flow controller is used for controlling the flow of the depressurized gas standard substance introduced into the prepared gas pipeline; the second gas mass flow controller is used for controlling the flow of the clean gas introduced into the prepared gas pipeline. The control unit is respectively connected with the first gas mass flow controller, the second gas mass flow controller and the system control module through data lines; the control unit is used for selecting automatic matching or manual matching to control the gas dilution process, displaying the gas flow in the gas mass flow controller and displaying the diluted standard gas concentration.

In one example, the gas path control module includes: the device comprises a first control gas pipeline, a second control gas pipeline, a first electromagnetic valve, a second electromagnetic valve and a programmable logic controller.

The standard gas dynamic preparation module is communicated with the calibrated environmental gas analyzer through the first control gas pipeline; the standard gas dynamic configuration module is communicated with the sampling pipe through the second control gas pipeline; the programmable logic controller is respectively connected with the first electromagnetic valve, the second electromagnetic valve and the system control module; the programmable logic controller is used for controlling the on-off states of the first electromagnetic valve and the second electromagnetic valve; the first electromagnetic valve is used for controlling the on-off of the first control gas pipeline; and the second electromagnetic valve is used for controlling the on-off of the second control gas pipeline. The programmable logic controller can output the low-concentration standard gas flowing out of the standard gas dynamic preparation module to the calibrated environment gas analyzer, and switches the sample introduction mode, namely, the environment air sample is switched into the standard gas to enter a calibration working mode, or the standard gas is switched into the environment air sample to enter a measurement working mode, so that the online tracing is realized.

In one example, in order to realize the monitoring of the monitoring environment where the gas standard substance containing device, the calibrated instrument system and the field end calibration system are located, the field monitoring auxiliary element is further arranged in the online intelligent calibration system of the environmental gas analyzer; the field monitoring auxiliary is connected with the system control module; the field monitoring auxiliary is used for acquiring real-time field information; the real-time field information comprises the temperature of the sampling pipe, the flow of the sampling pipe, the pressure in the gas standard substance containing device, whether the gas standard substance containing device leaks, the image of a drying agent in the calibrated instrument system, the image of a monitoring environment, the temperature of the monitoring environment, the humidity of the monitoring environment and the atmospheric pressure of the monitoring environment. The system control module is also used for monitoring the gas standard substance containing device, the calibrated instrument system and the monitoring environment according to the real-time field information to obtain a monitoring result. The system control module is also used for calculating the temperature difference between the temperature of the monitoring environment and the target temperature and adjusting the temperature of the environment where the calibrated environment gas analyzer is located according to the temperature difference.

In practical applications, the field monitoring accessory includes:

the device comprises a sampling pipe temperature sensor A, a sampling pipe flow sensor B, a gas pressure sensor C, a gas leakage sensor D, a drying agent image sensor F, an instrument image sensor E, an indoor temperature sensor G, an indoor humidity sensor H and an indoor atmospheric pressure sensor I. The indoor temperature sensor, the indoor humidity sensor and the indoor atmospheric pressure sensor may also be integrated into one sensor device.

Sampling pipe temperature sensor A is located the pipe wall in the middle of the sampling pipe for the temperature (heat tracing temperature) of monitoring ambient air sampling pipeline sends alarm information when finding the temperature anomaly.

Sampling pipe flow sensor B is located sampling pipe end for the flow of the measured ambient air sample in the monitoring ambient air sampling pipe sends alarm information when finding that the flow is unusual.

The gas pressure sensor C is positioned on a gas pipeline between an outlet of a gas cylinder filled with a gas standard substance and the standard gas dynamic preparation module, and is used for collecting the pressure in the gas standard substance containing device (specifically, monitoring the gas pressure in the gas cylinder filled with the gas standard substance), and sending alarm information when the pressure is too low.

The gas leakage sensor D is located inside the gas cylinder cabinet and used for determining whether the gas standard substance containing device leaks or not (specifically, whether the gas cylinder containing the gas standard substance leaks or not is monitored), and when gas leakage is found, alarming information is sent out.

The desiccant image sensor F is arranged at a distance from a desiccant equipped by the calibrated environmental gas analyzer, the lens is over against the desiccant tube to obtain an image of the desiccant, the image recognition technology is used for monitoring the color change condition of the gas desiccant carried by the calibrated environmental gas analyzer so as to judge the use condition of the gas desiccant, and when the desiccant is changed from blue to pink, an alarm message is sent out

The instrument image sensor E is positioned at a position higher than a room where the calibrated instrument system is positioned, the lens is over against the calibrated instrument system and the field terminal calibration system, images of a monitoring environment are obtained, and the instrument image sensor E is used for monitoring the appearance states of the calibrated environment gas analyzer and the field terminal calibration system and monitoring the environment (calibrating the field environment) based on an image recognition technology and sending alarm information when abnormal conditions are found.

Indoor temperature sensor G is located by school near instrument system for acquire monitoring environment's temperature, the temperature of being proofreaded the indoor environment that environmental gas analysis appearance place promptly, send alarm information when finding the temperature anomaly.

Indoor humidity transducer H is located by school near instrument system for acquire monitoring environment's humidity, by the humidity of the indoor environment of school's environmental gas analysis appearance place promptly, send alarm information when discovering that humidity is unusual.

Indoor atmospheric pressure sensor I is located by school instrument system near for acquire monitoring environment's atmospheric pressure, the atmospheric pressure of being the indoor environment of school environment gas analysis appearance place promptly, send alarm information when finding atmospheric pressure unusual.

In one example, the system control module includes:

the automatic zero-span calibration module is internally provided with a zero-span calibration program and is used for:

in the calibration mode, the gas circuit control module is controlled to input standard gas with different concentrations into the calibrated environment gas analyzer, a gas concentration indicating value measured by the calibrated environment gas analyzer is obtained, and a span parameter of the calibrated environment gas analyzer is adjusted according to a difference value between the gas concentration indicating value and a concentration value of the standard gas;

the automatic indicating value calibration module is internally provided with an automatic indicating value calibration program and is used for:

the automatic linearity checking module is internally provided with an automatic linearity checking program and is used for:

the automatic stability verification module is internally provided with an automatic stability verification program and is used for:

wherein the data collection operation is:

In one example, the system control module further comprises: a field end operation interface;

In one example, the system control module comprises an industrial controller, a display, a keyboard mouse, a switch and the like, and is the core for realizing automatic calibration. An automatic zero-span calibration module, an automatic indicating value calibration module, an automatic linearity verification module and an automatic stability verification module are arranged in the industrial controller. The display is provided with a field end operation interface. The system control module is connected with the data center through the Internet to realize data transmission; the system is connected with a standard gas dynamic configuration module, a gas circuit control module, a sampling pipe temperature sensor A, a sampling pipe flow sensor B, a gas pressure sensor C, a gas leakage sensor D, an instrument image sensor E, a drying agent image sensor F, an indoor temperature sensor G, an indoor humidity sensor H and an indoor atmospheric pressure sensor I through serial port data lines to realize data transmission; the system is communicated with a plurality of calibrated instruments through a network cable, can read the indication values of the instruments in real time, controls the instruments in a reverse mode, and monitors the gas flow and pressure, internal current, voltage and temperature in the instruments, alarms in the instruments and other information in real time; the control of the indoor air conditioner on site is realized through wireless transmission or a data line.

In one example, the online intelligent calibration system for an ambient gas analyzer further comprises: data center and user terminal display system.

The data center is connected with the system control module; and the data center is used for receiving the calibration result and the monitoring result sent by the system control module and sending alarm information according to the calibration result and the monitoring result. The data center is connected with the on-site end calibration system and the user side display system through the internet to realize data transmission, and the data center can be supported by an actual large computer server system and also can be supported by a cloud server system. The data center can collect, arrange and store data, information and video images of the calibrated instrument and the calibration site, set a control target and a calibration process, and form records, results or reports according to a preset mode. When the standard gas, the calibrated instrument, the sampling pipeline and the surrounding environment thereof are abnormal in daily operation or the data in the calibration process is out of tolerance, the data center can send an alarm or a maintenance notice to a user in real time to remind the user of timely maintenance.

The user side display system is connected with the data center; and the user side display system is used for displaying the alarm information. The user side display system comprises computer display equipment and mobile phone display equipment, and the user side logs in the data center through the computer display equipment to obtain calibration records, results and reports of the calibrated instrument, and real-time video images, alarms or maintenance notifications of the calibrated instrument and the surrounding environment; the information can be checked through the mobile phone display device, and the mobile phone display device has the functions of alarming or short message reminding of maintenance notice.

The online intelligent calibration system for the environmental gas analyzer in this embodiment is further described in detail below.

From the software perspective, the software part of the online intelligent calibration system of the environmental gas analyzer comprises: the system comprises an intelligent calibration part, a state monitoring part and a data management part. The intelligent calibration part is used for controlling the field-end calibration system to carry out calibration operation on the instrument to be calibrated, intelligently prepares standard gas with target concentration through the standard gas dynamic preparation module and leads the standard gas into the instrument to be calibrated; the method comprises a zero-span calibration program, an indication value calibration program, a linearity verification program, a stability verification program and other programs; these programs may be used alone or in combination; the device has the functions of data statistics, analysis, operation and judgment, and can feed back the correction instruction to the calibrated instrument. The calibration frequency can be set once a week, once a day or once a day according to the operation requirement, so as to realize high-frequency calibration. The starting time of the calibration program can be freely set according to the working requirement, and the calibration program can be automatically started at night or in the daytime. Automatic calibration or manual calibration can be selected, and when the automatic calibration is selected, a calibration program is automatically started according to the designed calibration frequency and the starting time; when manual calibration is selected, a worker can control the site end mark calibration system on site to perform calibration operation.

The standard gas dynamic preparation module is used for intelligently preparing standard gas with target concentration, and the implementation mode is as follows: according to the nominal concentration value of the bottled gas standard substance, the full range of the calibrated instrument and the concentration point position to be calibrated (such as 10% full range, 80% full range and the like), the target concentration of the standard gas dynamic configuration is automatically calculated, and the flow output values of two gas mass flow controllers in the standard gas dynamic configuration module are automatically adjusted according to the target concentration and the set total flow of the standard gas, the first gas mass flow controller controls the flow of the bottled gas standard substance, and the second gas mass flow controller controls the flow of the diluent gas from a zero gas source, so that the high-concentration bottled gas standard substance is diluted to the standard gas with the target concentration. If the characteristic component in the bottled gas standard substance is not only one but a plurality of characteristic components, one characteristic component is selected and locked, the characteristic component is diluted to a target concentration, and the target concentration is divided by a nominal concentration value of the component in the bottled gas standard substance to calculate a dilution coefficient. The diluted concentration of other characteristic components in the bottled gas standard substance is calculated by multiplying the nominal concentration value of other characteristic components in the bottled gas standard substance by the dilution coefficient.

After the automatic calibration process is started, a system control module of the on-site end calibration system issues a gas distribution instruction to a standard gas dynamic preparation module, and the standard gas dynamic preparation module automatically dilutes a high-concentration gas standard substance according to the received gas distribution instruction and outputs low-concentration standard gas; issuing a gas circuit switching instruction to a gas circuit control module, and opening and closing corresponding electromagnetic valves after the gas circuit control module receives the gas circuit switching instruction to input low-concentration standard gas into the calibrated instrument; and the system control module acquires the indicating value of the instrument measurement standard gas from the calibrated instrument in real time, analyzes and judges the indicating value, and selects whether to process or regulate the calibrated instrument according to the judgment result.

The implementation mode of the automatic zero-span calibration program is as follows: at a preset time point or after the last calibration program is finished, the system automatically starts the calibration program, diluent gas from a zero gas source is introduced into the instrument to be calibrated through a standard gas dynamic configuration module, the flow of the gas is automatically controlled, the original signal indicating value of the instrument to be calibrated is acquired in real time, and when the instrument to be calibrated is calibratedAfter the indication is stabilized, the difference between the indication of the instrument signal (i.e. the indication of the gas concentration) and "0" is automatically compared to obtain the difference between the indication of the gas concentration and "0", and the difference is automatically compared with the set zero point to calibrate the control target (e.g. for NO and SO)₂The method comprises the steps that a zero calibration control target is set for two gas components, the difference between a gas concentration indication value and 0 is not more than +/-10 nmol/mol, for a CO gas component, the zero calibration control target is set for the gas concentration indication value and 0 is not more than +/-1 μmol/mol, whether the difference is significant or not is judged, when the difference is significant (the difference does not meet the set zero calibration control target), a feedback correction instruction is automatically sent to an instrument to be corrected, a zero parameter of the instrument to be corrected is adjusted according to the difference, and when the difference is not significant (the difference meets the set zero calibration control target), feedback correction is not carried out. Then according to the program setting, the bottled gas standard substance is automatically prepared into the standard gas (for example 80% range point) of the concentration point for span calibration of the calibrated instrument by the standard gas dynamic preparation module, the standard gas is introduced into the calibrated instrument, the flow of the gas is automatically controlled, the original signal indication value of the calibrated instrument is collected in real time, after the indication value of the calibrated instrument is stable, the difference between the indication value of the instrument signal (gas concentration indication value) and the concentration value of the standard gas at the time is automatically compared to obtain the difference between the gas concentration indication value and the concentration value of the standard gas, and the difference and the set span calibration control target (for example: for NO, SO, calibration control target for span calibration control target are automatically performed₂And CO, setting a span calibration control target, namely comparing the difference between the gas concentration indication value and the concentration value of the standard gas with +/-5% of the concentration value of the standard gas to judge whether the difference is significant, automatically sending a feedback correction instruction to the instrument to be calibrated when the difference is significant (the difference does not meet the set span calibration control target), adjusting the span parameter of the instrument to be calibrated according to the difference, and not carrying out feedback correction when the difference is not significant (the difference meets the set span calibration control target). If the span parameters are adjusted, the system automatically and repeatedly runs the zero-span calibration program, automatically judges whether the indication value difference during zero calibration meets the set zero-point calibration control target or not and whether the indication value difference during span calibration meets the set span calibration control target or not again, and if the indication value difference meets the set span calibration control target or notIf yes, ending the zero-span calibration program and reporting all calibration records to the data center; if not, then the feedback correction adjustment is performed and the zero-crossing calibration procedure is repeated. If the zero-span calibration procedure is repeated for multiple times, the set zero-span calibration control target and the set span calibration control target cannot be simultaneously met, the calibration procedure is ended, the information of zero-span calibration out-of-tolerance and all calibration records are reported to the data center, and the data center sends an alarm or maintenance notice to a user side display system.

The automatic indicating value calibration program is realized in the following manner: at a preset time point or after the previous calibration program is finished, the system automatically starts the calibration program, standard gas (such as 0, 10%, 20%, 40%, 60% and 80% range points) at different concentration points is automatically prepared from bottled gas standard substances through a standard gas dynamic preparation module according to program setting, the standard gas is introduced into an instrument to be calibrated, the flow rate of the gas is automatically controlled, the original signal indication value of the instrument to be calibrated is collected in real time, after the indication value of the instrument to be calibrated is stable, the original signal indication value and the standard gas concentration value of the instrument are automatically recorded, the standard gas concentration values at different concentration points and the corresponding original signal indication value of the instrument are made into a linear regression curve, and parameters (such as an intercept, a slope and a linear coefficient) of the regression curve are stored. The site-end calibration system automatically switches a sample introduction mode through the gas circuit control module, switches standard gas into an environment air sample, introduces the measured actual environment air sample into the calibrated instrument, collects the original signal indicating value of the calibrated instrument in real time, automatically calculates the real concentration value of the measured environment air sample according to the regression curve parameter obtained last time, and reports all calibration records to the data center.

The automatic linearity verification program is realized in the following manner: at a preset time point or after the last calibration program is finished, the system automatically starts the calibration program, standard gas (such as 0, 10%, 20%, 40%, 60% and 80% range points) at different concentration points is automatically prepared from bottled gas standard substances through a standard gas dynamic preparation module according to program setting, the standard gas is introduced into an instrument to be calibrated, the flow of the gas is automatically controlled, the original signal indicating value of the instrument to be calibrated is acquired in real time, after the indicating value of the instrument to be calibrated is stable, the original signal indicating value and the standard gas concentration value of the instrument are automatically recorded, a linear regression curve is made by the standard gas concentration values at different concentration points and the original signal indicating value of the instrument, parameters (such as an intercept, a slope and a linear coefficient) of the regression curve are stored, and the program is finished. The system automatically judges whether the obtained parameters such as intercept, slope and linear coefficient have significant difference compared with a set parameter control target (the intercept is in the range of +/-1% of full scale, the slope is more than or equal to 0.95 and less than or equal to 1.05, and the linear coefficient is more than 0.999). If the difference is obvious (the parameters do not meet the set parameter control target), the information of linearity check out-of-tolerance and all check records are reported to the data center, and the data center sends an alarm or maintenance notice to a user side display system; if the difference is not significant (the parameters meet the set parameter control target), all verification records are reported to the data center.

The automatic stability verification program is implemented as follows: at a preset time point or after the previous calibration program is finished, the system automatically starts the calibration program, diluent gas from a zero gas source is introduced into an instrument to be calibrated through a standard gas dynamic preparation module according to the program setting, the flow rate of the gas is automatically controlled, the original signal indicating value of the instrument to be calibrated is collected in real time, when the indicating value of the instrument to be calibrated is stable and the difference between the indicating value and 0 is not more than a certain preset value, bottled gas standard substances are automatically prepared into standard gas (such as 20% measuring range point) of a certain concentration point through the standard gas dynamic preparation module, the standard gas is introduced into the instrument to be calibrated, the flow rate of the gas is automatically controlled, the original signal indicating value of the instrument to be calibrated is collected in real time, and the original signal indicating value of the instrument is automatically recorded after the indicating value of the instrument to be calibrated is stable. And (5) repeatedly introducing zero gas and standard gas for multiple times in a circulating manner to obtain multiple original signal indicating value data, and ending the program. The system automatically carries out statistical analysis on the data to obtain the relative standard deviation value of the data, and the system automatically judges whether the obtained relative standard deviation value is significantly different from a set deviation control target (for example, the relative standard deviation value of the instrument indication value is less than or equal to 5 percent). If the difference is obvious (the relative standard deviation value does not meet the set deviation control target), the information of 'stability verification is out of tolerance' and all verification records are reported to the data center, and the data center sends an alarm or maintenance notice to a user side display system; if the difference is not significant (the relative standard deviation value meets the set deviation control target), all verification records are reported to the data center. If the value indicated by the calibrated instrument is unstable when the diluent gas from a zero gas source is introduced in the process of executing the program, or the value is stable but the difference with the value of 0 is larger than a certain preset value, the program is stopped, the information of 'stability verification over-tolerance' and all verification records are reported to a data center, and the data center sends an alarm or maintenance notice to a user side display system.

The state monitoring part realizes the omnibearing monitoring of the calibrated instrument and the calibration system through the field monitoring auxiliary part and the system control module: monitoring the standard gas state such as gas pressure, gas leakage and gas flow in the gas cylinder in real time, and comparing the monitored value with the corresponding data quality control target (such as that the gas pressure in the gas cylinder is not lower than 1MPa, the gas concentration is less than the set alarm threshold value of the sensor, and the difference between the gas flow measurement value and the set gas flow value is less than 1 percent of the set gas flow value); monitoring key parameters of the calibrated instrument in real time, such as gas flow and pressure, internal current, voltage and temperature, alarm information and the like in the instrument, and comparing the monitored values with corresponding data quality control targets (given by instrument manufacturers); monitoring the ambient air sampling pipeline in real time, such as the heat tracing temperature of a sampling pipe and the flow of a detected ambient air sample in the sampling pipe, and comparing the monitored value with a corresponding data quality control target (such as the temperature control target is +/-5 ℃ of a set temperature value, and the flow control target is 20% of the set flow value); monitoring the condition of a drying agent of a calibrated instrument, the appearance states of the calibrated instrument and a field end calibration system and calibrating the field environment in real time through videos, and comparing the result of image identification with a normal image; the indoor temperature, humidity and atmospheric pressure are monitored in real time, the monitored values are compared with corresponding data quality control targets (such as the temperature control target is +/-2 ℃ of the set temperature value, and the humidity control target is +/-20% HR of the set humidity value), and the temperature of the indoor air conditioner can be regulated and controlled. All monitoring data, records and video images are sent to a data center in real time through a system control module, when a certain monitored data exceeds the corresponding data quality control target requirement or the image identification result is obviously different from a normal image, the alarm information is sent to the data center in real time, and the data center sends an alarm or maintenance notice to a user side display system.

When the monitored indoor temperature exceeds the set control target parameter range, the system control module of the on-site end calibration system automatically calculates the temperature difference, sends a temperature adjusting instruction to the air conditioner according to the temperature difference, and adjusts the temperature of the indoor environment where the calibrated instrument is located so as to enable the calibrated instrument to be in the temperature range where the calibrated instrument normally works. If the indoor temperature still exceeds the set control target range after the adjustment, the on-site end calibration system automatically records information, sends the alarm information to the data center in real time, and sends an alarm or maintenance notice to the user side display system by the data center.

The data management part comprises the steps of acquiring, storing, analyzing, processing and setting monitoring parameters of data and images. The site end calibration system acquires data and image information including calibration records, calibration results, out-of-tolerance information and state monitoring, stores the data and the image information in a site end, and simultaneously sends the data and the image information to a data center in real time; the data center stores all data and image information sent by the on-site end calibration system. Data and image information stored by the site calibration system are updated circularly in weeks, months or years; the data center permanently stores the acquired data and image information. And the site end-marking calibration system analyzes and judges whether the calibration result is out of tolerance and the monitoring parameter exceeds the control target, and sends alarm information to the data center when the calibration result is out of tolerance or the monitoring parameter exceeds the control target. When the calibrated instrument needs to be corrected according to the calibration program, the field-end calibration system automatically sends a correction feedback instruction to the calibrated instrument, and the calibrated instrument automatically adjusts relevant parameters according to the instruction to realize correction. The data center stores and analyzes all data and image information sent by the on-site calibration system, and sends alarm or maintenance information to the user side display system in a short message mode in real time for the conditions of out-of-tolerance and out-of-target, so as to prompt the user to maintain in time.

The monitoring parameter setting can be completed by logging in a field end operation interface through a field end calibration system, or logging in a data center through a user end display system, and the monitoring parameter setting are completed by the data center. The setting of the monitoring parameters comprises the following steps: calibration parameters and state control target parameters.

Calibration parameters, such as nominal concentration value of bottled gas standard substance, total flow rate of standard gas prepared by a standard gas dynamic preparation module, selection of calibration program, concentration point to be calibrated, data quality control target in calibration (setting zero calibration control target, setting span calibration control target, setting parameter control target, setting deviation control target), calibration program start time, calibration program cycle number and the like.

And state control target parameters such as the lowest pressure of the gas pressure in the bottled gas standard substance bottle, whether a gas leakage alarm sends an alarm signal, the temperature range of the ambient air sampling pipe accompanied by heat, the flow range of the measured ambient air sample in the ambient air sampling pipe, the range of the indoor ambient temperature of the calibrated instrument, the gas flow and pressure in the calibrated instrument, the normal working range of the internal current voltage and temperature, the desiccant of the calibrated instrument monitored by real-time video, the difference degree of the image recognition results of the calibrated instrument and the field end calibration system compared with the normal image and the like.

The online intelligent calibration system for the environmental gas analyzer can automatically realize intelligent calibration of the environmental gas analyzer every day, every week and every quarter, and can monitor the environmental states of standard gas for calibration, a calibrated instrument, a sampling pipeline and a monitoring station in real time. The system realizes intelligent calibration: the calibration method can automatically prepare standard gas according to a target, perform online tracing, feedback correction and high-frequency calibration on a calibrated instrument, automatically run the whole calibration process, and automatically acquire data, generate records and calibrate reports; the system realizes omnibearing monitoring: the standard gas state such as gas pressure, gas leakage and gas flow in the bottle can be monitored in real time, key parameters such as internal gas flow and pressure, internal current voltage and temperature, desiccant condition and the like of the calibrated instrument can be monitored in real time, the ambient air sampling pipeline such as a gas production pipe is subjected to heat tracing temperature and gas production flow can be monitored in real time, the ambient state in a station such as indoor temperature, humidity and atmospheric pressure can be monitored in real time, and the temperature of an indoor air conditioner can be regulated and controlled. The system is provided with a site terminal calibration system, a data center and a user terminal display system. The site end calibration system is used for simultaneously communicating a plurality of calibrated environment gas analyzers through a network port, reading the indicating values of the calibrated instruments in real time, performing inverse control and indicating value feedback correction on the calibrated instruments, contains site monitoring accessories and realizes real-time monitoring and control on parameters such as flow, temperature, humidity, gas pressure, gas leakage and the like through a serial port; the site end calibration system transmits the acquired calibration data, monitoring data and video images to a data center through the Internet, so that the data center can monitor, control and record the calibrated instrument and the calibration site, collect the calibration data and compile a calibration report; the data center is accessed to a user side display system through the Internet, and a user logs in the data center through the display system to obtain calibration records, results and reports of the calibrated instrument, real-time video images of the calibrated instrument and the surrounding environment and notifications sent by the data center; when the gas standard substance, the calibrated instrument, the sampling system and the surrounding environment of the sampling system are abnormal or out of tolerance in the daily operation or calibration process, the data center can send a notice to a user in real time to remind the user of timely maintenance.

This with real-time sampling, automatic monitoring, online intelligent calibration system of intelligent calibration environmental gas analysis appearance as an organic whole has replaced artifical numerous and diverse work that goes to the scene regularly and carry out the calibration, the intelligent calibration to environmental gas analysis appearance has been realized, it is loaded down with trivial details to have solved the complex operation that present artifical calibration exists, waste time and energy, it is untimely to trace back to the source, data authenticity and validity can not obtain the powerful assurance, a series of problems such as fortune dimension cost height, the calibration frequency and the efficiency to environmental gas analysis appearance have been improved, fortune dimension cost has been reduced, a series of problems such as the original data mistake or the fake that cause because of human factor have been stopped.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims

1. The utility model provides an online intelligent calibration system of ambient gas analysis appearance which characterized in that includes: a field end calibration system; the field end calibration system comprises: the system comprises a system control module, and a gas standard substance containing device, a standard gas dynamic preparation module and a gas circuit control module which are connected with the system control module;

the system control module is configured to:

under the measurement mode, controlling the gas circuit control module to input an ambient air sample collected by the sampling pipe into the calibrated ambient gas analyzer, acquiring a gas concentration indicating value of the ambient air sample measured by the calibrated ambient gas analyzer, and correcting the gas concentration indicating value of the ambient air sample by adopting a linear regression curve; the linear regression curve represents the relation between standard gases with different concentrations introduced into the calibrated environmental gas analyzer and corresponding gas concentration indicating values measured by the calibrated environmental gas analyzer;

2. The online intelligent calibration system for the environmental gas analyzer according to claim 1, wherein the system control module comprises:

an automatic zero-span calibration module to:

an automatic indication calibration module to:

an automatic linearity verification module to:

an automatic stability verification module to:

wherein the data collection operation is:

3. The online intelligent calibration system for the environmental gas analyzer is characterized by further comprising an on-site monitoring accessory;

the field monitoring auxiliary is connected with the system control module; the field monitoring auxiliary is used for acquiring real-time field information; the real-time field information comprises the temperature of the sampling pipe, the flow of the sampling pipe, the pressure in the gas standard substance containing device, whether the gas standard substance containing device leaks or not, an image of a drying agent in the calibrated instrument system, an image of a monitoring environment, the temperature of the monitoring environment, the humidity of the monitoring environment and the atmospheric pressure of the monitoring environment;

4. The online intelligent calibration system for the environmental gas analyzer according to claim 3, further comprising: a data center;

5. The online intelligent calibration system for the environmental gas analyzer according to claim 4, further comprising: a user side display system;

6. The online intelligent calibration system for the environmental gas analyzer according to claim 1, wherein the standard gas dynamic configuration module comprises: the system comprises a gas preparation pipeline, a pressure regulating valve, a first gas mass flow controller, a second gas mass flow controller and a control unit;

7. The online intelligent calibration system for the environmental gas analyzer according to claim 1, wherein the gas path control module comprises: the system comprises a first control gas pipeline, a second control gas pipeline, a first electromagnetic valve, a second electromagnetic valve and a programmable logic controller;

8. The online intelligent calibration system for the environmental gas analyzer as claimed in claim 3, wherein the on-site monitoring accessory comprises:

the sampling pipe temperature sensor is used for acquiring the temperature of the sampling pipe; the sampling pipe flow sensor is used for collecting the flow of the sampling pipe; the gas pressure sensor is used for collecting the pressure in the gas standard substance containing device; the gas leakage sensor is used for determining whether the gas standard substance containing device leaks or not; the drying agent image sensor is used for acquiring an image of a drying agent in the calibrated instrument system; the instrument image sensor is used for acquiring an image of a monitoring environment; the indoor temperature sensor is used for acquiring the temperature of a monitored environment; the indoor humidity sensor is used for acquiring the humidity of a monitored environment; the indoor atmospheric pressure sensor is used for acquiring atmospheric pressure of a monitored environment.

9. The online intelligent calibration system for the environmental gas analyzer according to claim 3, wherein the system control module is further configured to calculate a temperature difference between the temperature of the monitored environment and a target temperature, and adjust the temperature of the environment where the calibrated environmental gas analyzer is located according to the temperature difference.

10. The online intelligent calibration system for the environmental gas analyzer according to claim 2, wherein the system control module further comprises: a field end operation interface;