CN114577968A - Calibration gas circuit and calibration method of non-methane total hydrocarbon continuous monitoring system - Google Patents
Calibration gas circuit and calibration method of non-methane total hydrocarbon continuous monitoring system Download PDFInfo
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- CN114577968A CN114577968A CN202011396797.3A CN202011396797A CN114577968A CN 114577968 A CN114577968 A CN 114577968A CN 202011396797 A CN202011396797 A CN 202011396797A CN 114577968 A CN114577968 A CN 114577968A
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- G01N30/8665—Signal analysis for calibrating the measuring apparatus
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Abstract
The invention discloses a calibration gas circuit of a non-methane total hydrocarbon continuous monitoring system, which comprises a standard gas circuit and a gas analyzer, wherein an FID detector and a gas outlet are arranged in the gas analyzer; the gas analyzer is internally provided with a calibration parameter acquisition module and a calibration equation storage module, the calibration parameter acquisition module is in telecommunication connection with the FID detector and the calibration equation storage module, so that standard gas concentration data acquired by the FID detector are transmitted to the calibration parameter acquisition module, the calibration parameter acquisition module obtains calibration equation parameters according to the concentration of the standard gas and the ratio of the peak area, and transmits the obtained calibration equation parameters to the standard equation storage module for calibration. The calibration gas circuit and the calibration method can meet the requirement of calibrating a non-methane total hydrocarbon continuous monitoring system, and the gas circuit has a simple structure, the method is convenient and quick to operate, and the reliability of the instrument is improved.
Description
Technical Field
The invention relates to a fixed pollution source waste gas detection technology, in particular to a calibration gas circuit and a calibration method of a non-methane total hydrocarbon continuous monitoring system.
Background
In the detection of the waste gas of the fixed pollution source, a non-methane total hydrocarbon continuous monitoring system is usually adopted for detection, however, for the non-methane total hydrocarbon continuous monitoring system, the non-methane total hydrocarbon continuous monitoring system is eroded by the waste gas at any moment, so that impurities can be accumulated in the non-methane total hydrocarbon continuous monitoring system, and therefore an instrument is operated in an abnormal state, the reliability of the instrument is reduced, and the accuracy of data analysis is reduced.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a calibration gas circuit and a calibration method of a non-methane total hydrocarbon continuous monitoring system, the calibration gas circuit and the calibration method can meet the requirement of calibrating the non-methane total hydrocarbon continuous monitoring system, the gas circuit has a simple structure, the method is convenient and quick to operate, and the reliability of an instrument is improved.
The technical scheme adopted by the invention for solving the technical problems is as follows: a calibration gas circuit of a non-methane total hydrocarbon continuous monitoring system comprises a standard gas circuit and a gas analyzer, wherein an FID detector and a gas outlet are arranged in the gas analyzer, and the standard gas circuit is connected to the FID detector in the gas analyzer;
the gas analyzer is internally provided with a calibration parameter acquisition module and a calibration equation storage module, the calibration parameter acquisition module is in telecommunication connection with the FID detector and the calibration equation storage module, so that standard gas concentration data acquired by the FID detector are transmitted to the calibration parameter acquisition module, the calibration parameter acquisition module obtains calibration equation parameters according to the concentration of the standard gas and the ratio of the peak area, and transmits the obtained calibration equation parameters to the standard equation storage module for calibration.
Optionally, a standard gas solenoid valve is arranged in the standard gas path.
Optionally, the gas analyzer is further connected with a zero gas generator, so that the gas inlet of the FID detector is connected with the standard gas path and the zero gas generator.
Optionally, the zero gas generator is connected to the FID detector via a zero gas solenoid valve.
Optionally, the standard gas solenoid valve and the zero gas solenoid valve are both normally closed solenoid valves.
The invention also provides a calibration method of the non-methane total hydrocarbon continuous monitoring system, which is characterized in that an automatic calibration gas circuit is connected in the gas analyzer to realize automatic calibration;
the automatic calibration gas path comprises a standard gas path and a gas analyzer, wherein an FID detector and a gas outlet are arranged in the gas analyzer, and the standard gas path is connected to the FID detector in the gas analyzer;
the gas analyzer is internally provided with a calibration parameter acquisition module and a calibration equation storage module, the calibration parameter acquisition module is in telecommunication connection with the FID detector and the calibration equation storage module, so that standard gas concentration data acquired by the FID detector are transmitted to the calibration parameter acquisition module, the calibration parameter acquisition module obtains calibration equation parameters according to the concentration of the standard gas and the ratio of the peak area, and transmits the obtained calibration equation parameters to the standard equation storage module for calibration.
By adopting the technical scheme, the calibration gas circuit and the calibration method can meet the requirement of calibrating the non-methane total hydrocarbon continuous monitoring system, the gas circuit is simple in structure, the method is convenient and quick to operate, and the reliability and the accuracy of the instrument are improved.
Drawings
Fig. 1 is a schematic structural diagram of a calibration air circuit of the present invention.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1, the invention discloses a calibration gas circuit of a non-methane total hydrocarbon continuous monitoring system, which comprises a standard gas circuit 1, a zero gas circuit 2 and a gas analyzer 3, wherein an FID detector 4 and a gas outlet 5 are arranged in the gas analyzer, and the standard gas circuit 1 is connected to the FID detector 4 in the gas analyzer.
In the invention, a calibration parameter acquisition module and a calibration equation storage module are arranged in the gas analyzer 3, the calibration parameter acquisition module is in telecommunication connection with the FID detector 4 and the calibration equation storage module, so that standard gas concentration data acquired by the FID detector 4 are transmitted to the calibration parameter acquisition module, the calibration parameter acquisition module obtains calibration equation parameters according to the concentration of the standard gas and the ratio of the peak area, and transmits the obtained calibration equation parameters to the standard equation storage module for calibration.
Under normal conditions, the relationship between the standard gas concentration and the peak appearance area satisfies the following relationship equation
y＝kx+b；
Wherein y represents the standard gas concentration, x represents the peak area, and k and b are constants.
In actual use, impurities are accumulated in the non-methane total hydrocarbon continuous monitoring system frequently, so that the monitoring data is inaccurate, and the constants k and b are converted according to the original numbers if the constants k and b are converted after the impurities exist in the gas circuit. Therefore, the values of the constants k and b need to be adjusted in real time to meet the requirement.
In the invention, when tuning k and b, two cases are provided, namely, the case that b is 0, which is called zero-crossing tuning, namely, tuning is carried out without introducing zero gas, and the tuning mode can be used for tuning the non-methane total hydrocarbon continuous monitoring system in the initial stage of use, for example, the tuning mode is carried out in the first two months of the use of the non-methane total hydrocarbon continuous monitoring system; the other mode is the case that b is not equal to 0, the tuning mode needs to introduce zero gas and standard gas respectively to determine the k and b values, and the tuning mode can be used for tuning the non-methane total hydrocarbon continuous monitoring system in the later period of use, for example, the tuning mode is adopted after the non-methane total hydrocarbon continuous monitoring system is put into use for two months.
In the invention, one end of the standard gas circuit 1 is provided with a standard gas storage steel cylinder 101, and the standard gas storage steel cylinder 101 is connected with a gas inlet of the FID detector 4 through a gas pipe and a standard gas electromagnetic valve 102. Similarly, a zero gas generator 201 is arranged at one end of the zero gas circuit 2, and the zero gas generator 201 is connected with the gas inlet of the FID detector 4 through a gas pipe and a zero gas electromagnetic valve 202. The standard gas solenoid valve 102 and the zero gas solenoid valve 202 are both normally closed solenoid valves.
In the invention, the gas outlet 5 is connected with a gas flowmeter 6 so as to monitor and feed back the flow of the standard gas and the flow of the zero gas.
In the present invention, the sample gas inlet 7 of the gas analyzer 3 is connected to the gas outlet 5, and the connection branch of the sample gas inlet 7 is provided in the rear stage gas path of the gas flowmeter 6.
The invention also provides a calibration method of the non-methane total hydrocarbon continuous monitoring system, which is characterized in that an automatic calibration gas circuit is connected in the gas analyzer 3 to realize automatic calibration.
The calibration method comprises the following specific steps:
s1, the control module of the gas analyzer 3 drives the standard gas solenoid valve 102 or the zero gas solenoid valve 202 to open, so that the standard gas or the zero gas enters the FID detector 4 in the gas analyzer 3;
s2, analyzing the concentration and the peak area of the standard gas or the zero gas by the FID detector 4, and outputting the data to the calibration parameter acquisition module;
s3, calculating the values of the constants k and b by the calibration parameter acquisition module according to the acquired concentration and peak area of the standard gas or collar;
and S4, the calibration parameter acquisition module outputs the calculated values of k and b to the calibration equation storage module, so that the calibration equation storage module updates the values of the constants k and b, thereby completing calibration.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Besides the technical features described in the specification, other technical features are known to those skilled in the art, and are not described in detail herein in order to highlight the innovative features of the present invention.
Claims (6)
1. A calibration gas circuit of a non-methane total hydrocarbon continuous monitoring system is characterized by comprising a standard gas circuit and a gas analyzer, wherein an FID detector and a gas outlet are arranged in the gas analyzer, and the standard gas circuit is connected to the FID detector in the gas analyzer;
the gas analyzer is internally provided with a calibration parameter acquisition module and a calibration equation storage module, the calibration parameter acquisition module is in telecommunication connection with the FID detector and the calibration equation storage module, so that standard gas concentration data acquired by the FID detector are transmitted to the calibration parameter acquisition module, the calibration parameter acquisition module obtains calibration equation parameters according to the concentration of the standard gas and the ratio of the peak area, and transmits the obtained calibration equation parameters to the standard equation storage module for calibration.
2. The calibration gas circuit of the continuous monitoring system for non-methane total hydrocarbons according to claim 1, wherein a standard gas solenoid valve is disposed in the standard gas circuit.
3. The calibration gas circuit of the continuous monitoring system for non-methane total hydrocarbons according to claim 2, wherein the gas analyzer is further connected with a zero gas generator, so that the gas inlet of the FID detector is connected with the standard gas circuit and the zero gas generator.
4. The calibration gas circuit of the continuous non-methane total hydrocarbon monitoring system according to claim 3, wherein the zero gas generator is connected to the FID detector through a zero gas solenoid valve.
5. The calibration gas circuit of the continuous non-methane total hydrocarbon monitoring system according to claim 4, wherein the standard gas solenoid valve and the zero gas solenoid valve are both normally closed solenoid valves.
6. A calibration method of a non-methane total hydrocarbon continuous monitoring system is characterized in that an automatic calibration gas circuit is connected in a gas analyzer to realize automatic calibration;
the automatic calibration gas path comprises a standard gas path and a gas analyzer, an FID detector and a gas outlet are arranged in the gas analyzer, and the standard gas path is connected to the FID detector in the gas analyzer;
the gas analyzer is internally provided with a calibration parameter acquisition module and a calibration equation storage module, the calibration parameter acquisition module is in telecommunication connection with the FID detector and the calibration equation storage module, so that standard gas concentration data acquired by the FID detector are transmitted to the calibration parameter acquisition module, the calibration parameter acquisition module obtains calibration equation parameters according to the concentration of the standard gas and the ratio of the peak area, and transmits the obtained calibration equation parameters to the standard equation storage module for calibration.
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