Method for rapidly and stably reading gaseous pollutant control inspection data

Abstract

The invention relates to a method for rapidly and stably reading gaseous pollutant detection data, and belongs to the field of atmospheric environment detection quality control. According to the scheme, the method mainly comprises the following steps: introducing gas with specific concentration into gaseous pollutant monitoring equipment, and recording monitoring readings every first period; setting a time sliding window, wherein the time sliding window comprises moments corresponding to a preset number of monitoring readings; calculating the standard deviation of the monitoring reading corresponding to each moment in the time sliding window; if the standard deviation is larger than or equal to a preset threshold value, the time sliding window slides forwards for at least one first period, and the standard deviation is recalculated; otherwise, acquiring a mean value of the monitoring readings corresponding to all moments in the time sliding window; and taking the mean value as a stable reading of the quality control inspection.

Description

Technical Field

[0001] The present invention belongs to the field of quality control for atmospheric environment monitoring, and more particularly relates to a method for quickly and stably reading data for quality control inspection of gaseous pollutants. Background Art

[0002] Atmospheric environment monitoring monitors various pollutants (such as SO2, NO2, CO, O3, PM2.5, PM10, etc.) in the atmospheric environment. Continuous real-time monitoring is achieved through automatic monitoring equipment, providing key data support for aspects such as environmental quality assessment, public health protection, ecosystem maintenance, and environmental management decision-making. The monitoring equipment for continuous monitoring needs to undergo strict equipment maintenance and quality management to ensure the accuracy and reliability of the monitoring data obtained by the monitoring equipment. For monitoring equipment for gaseous pollutants (SO2, NO2, CO, O3), zero-point checks and span checks are also required to calibrate and correct the deviation problems of the monitoring results caused by long-term operation of the equipment.

[0003] The zero-point check is the monitoring value of the instrument measured when it is determined that there is no input of the measured signal. Usually, the zero gas generated by the zero gas generator is introduced into the monitoring equipment, and the reading of the monitoring equipment is recorded as the zero-point deviation when the reading is stable. The span check is to introduce a standard gas with a concentration of 80% of the full scale of the instrument into the monitoring instrument through a gas dynamic calibrator, and the reading of the monitoring equipment is recorded as the response value after the reading is stable, and the correlation coefficient and slope are calculated to meet the equipment standard requirements.

[0004] For the judgment of reading stability, the traditional method is to estimate a relatively redundant time to ensure reading stability, and the reading of the monitoring equipment at this time point is taken as the response value. However, this method has serious deficiencies. On the one hand, the reading time is fixed and does not consider the differences caused by different equipment, different meteorological conditions, etc. There may be a situation where the monitoring value of some equipment is still fluctuating when reading at this time point. On the other hand, if a certain moment after a relatively long time after the start of the check is taken as the reading moment, it may lead to the consumption of more standard gas, resulting in unnecessary waste.

[0005] In summary, due to the existing stability judgment method having problems of poor determinacy and large gas consumption. Summary of the Invention

[0006] In view of the above analysis, to solve the above problems, an embodiment of the present invention provides a method for quickly and stably reading data for quality control inspection of gaseous pollutants, including the following steps:

[0007] Introduce a gas with a specific concentration into the gaseous pollutant monitoring equipment, and record the monitoring readings every first period;

[0008] Set a time sliding window, where the time sliding window includes moments corresponding to a preset number of the monitoring readings;

[0009] Calculate the standard deviation of the monitoring readings corresponding to each moment in the time sliding window;

[0010] If the standard deviation is greater than or equal to a preset threshold, the time sliding window slides forward by at least one first period, and recalculate the standard deviation; otherwise, obtain the mean value of the monitoring readings corresponding to each moment in the time sliding window;

[0011] Use the mean value as the stable reading for the quality control check.

[0012] In some embodiments, the quality control check includes a zero point check, and the specific concentration gas is zero gas.

[0013] In some embodiments, if SO2, NO2, or O3 is used as the monitoring target for gaseous pollutants, the set threshold is 1 ppb;

[0014] If CO is used as the monitoring target for gaseous pollutants, the set threshold is 1 ppm.

[0015] In some embodiments, the quality control check includes a span check, and the concentration of the specific concentration gas is between 70% and 100% of the full scale of the gaseous pollutant monitoring device.

[0016] In some embodiments, the set threshold is 0.5% of the span check point, and the span monitoring point is between 70% and 100% of the full scale of the gaseous pollutant monitoring device.

[0017] In some embodiments, the length of the first period is between 0.5 and 5 minutes.

[0018] In some embodiments, the preset number is between 3 and 10.

[0019] In some embodiments, the length of the first period is 1 minute, the preset number is 5, and the calculation of the standard deviation of the monitoring readings corresponding to each moment in the time sliding window is expressed as:

[0020]

[0021] where sd(x t ) represents the standard deviation of the monitoring readings in the time sliding window at time t, x t represents the monitoring reading at time t, represents the mean value of the monitoring readings corresponding to each moment in the time sliding window,

[0022] In some embodiments, after obtaining the stable reading, the method further includes:

[0023] If the stable reading exceeds a preset range, the gaseous pollutant monitoring device is maintained.

[0024] The above embodiments of the present invention have at least the following beneficial effects:

[0025] The method for quickly and stably reading the quality control inspection data of gaseous pollutants provided by the embodiments of the present invention uses the sample standard deviation calculation within a continuous period of time, and proposes a simple and efficient method for judging data stability, effectively making up for the uncertainty problem caused by the inability to judge data stability in the prior art and the problem of increasing the consumption of standard gas. Compared with the method of predicting a redundant time to read the inspection value, the present invention uses a sliding window method, selects more sample points, and can more accurately judge the data stable state. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present specification or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the embodiments of the present specification. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0027] Figure 1 It is a schematic flow chart of a method for quickly and stably reading the quality control inspection data of gaseous pollutants provided by the embodiments of the present invention. Detailed Embodiments

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. It should be noted that, without conflict, the implementation manners and features in the present disclosure can be combined, separated, interchanged, and / or rearranged. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] The terms used herein are for the purpose of describing particular embodiments and are not intended to be limiting. As used herein, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are also intended to include the plural forms. Further, when the terms "comprise" and / or "include" and their variants are used in this specification, it is stated that the stated features, integers, steps, operations, components, assemblies and / or groups thereof exist, but do not preclude the existence or addition of one or more other features, integers, steps, operations, components, assemblies and / or groups thereof. It should also be noted that, as used herein, the terms "substantially", "about" and other similar terms are used as approximate terms and not as terms of degree, and thus they are used to interpret the inherent deviations of measured, calculated and / or provided values that would be recognized by a person of ordinary skill in the art.

[0030] The present disclosure will be described below through several specific embodiments. In order to keep the following description of the embodiments of the present invention clear and concise, the detailed description of known functions and known components is omitted in the present invention. Please refer to Figure 1 , the embodiments of the present invention provide a method for quickly and stably reading quality control inspection data of gaseous pollutants, including the following steps:

[0031] Introduce a gas with a specific concentration into the gaseous pollutant monitoring device, and record the monitoring readings every first period;

[0032] Set a time sliding window, where the time sliding window includes the moments corresponding to a preset number of the monitoring readings;

[0033] Calculate the standard deviation of the monitoring readings corresponding to each moment in the time sliding window;

[0034] If the standard deviation is greater than or equal to a preset threshold, the time sliding window slides forward by at least one first period, and the standard deviation is recalculated; otherwise, obtain the mean value of the monitoring readings corresponding to each moment in the time sliding window;

[0035] Use the mean value as the stable reading of the quality control inspection.

[0036] In some embodiments, the quality control inspection includes a zero point inspection, and the specific concentration gas is zero gas. The zero point inspection is the instrument monitoring value measured when it is determined that the instrument has no input of the signal to be measured. Usually, the zero gas generated by a zero gas generator is introduced into the monitoring device, and the reading of the monitoring device is recorded as the zero point deviation when the reading is stable. The purpose is to confirm whether the reading of the device at zero concentration (i.e., no target gas) is close to zero and whether there is zero point drift (zero point offset) in the detection device, so as to ensure the accuracy of the measurement results. Generally, it is necessary to wait for the device to be stable after introducing the zero gas and then record the reading of the device. The waiting time in the traditional method is uncertain, and it is also difficult to determine whether the device is stable. Therefore, the reading obtained after stability is also inaccurate.

[0037] The above method of the present invention can be applied to the zero point inspection of gaseous pollutant monitoring devices. Compared with the method of predicting a redundant time to read the inspection value, the present invention uses a sliding window method, selects more sample points, and can more accurately judge the data stable state. It effectively makes up for the uncertainty problem caused by the inability to judge the data stability in the prior art and the problem of increasing the consumption of standard gas.

[0038] In some embodiments, if SO2, NO2 or O3 is used as the monitoring target of gaseous pollutants, the set threshold is 1 ppb;

[0039] If CO is used as the monitoring target of gaseous pollutants, the set threshold is 1 ppm.

[0040] In some embodiments, the quality control inspection includes a span inspection, and the concentration of the specific concentration gas is between 70% and 100% of the full scale of the gaseous pollutant monitoring device. In one embodiment of the present invention, for example, it is 80%.

[0041] The above method of the present invention can be applied to the span inspection of gaseous pollutant monitoring devices. Compared with the method of predicting a redundant time to read the inspection value, the present invention uses a sliding window method, selects more sample points, and can more accurately judge the data stable state. It effectively makes up for the uncertainty problem caused by the inability to judge the data stability in the prior art and the problem of increasing the consumption of standard gas.

[0042] In some embodiments, the set threshold is 0.5% of the span inspection point, and the span monitoring point is between 70% and 100% of the full scale of the gaseous pollutant monitoring device. In one embodiment of the present invention, for example, it is 80%. The span inspection point is consistent with the concentration of the gas to be introduced, and it is necessary to check to determine whether the two are consistent.

[0043] For example, in some embodiments of span check, let C be the full-scale value of the device. For example, for monitoring devices of SO2, NO2, O3, etc., the measurement range is 500 ppb, and the measurement range of the CO monitoring device is 50 ppm or 20 ppm. Then the preset threshold c is c = 0.005·0.8·C, and it is used to determine whether the standard deviation is less than 0.5% of the span point.

[0044] Preferably, for zero point check or span check, before introducing zero gas or standard gas, some embodiments of the present invention further include:

[0045] Checking whether the zero gas generator can work properly, whether the gas path leaks, whether the standard gas is in an abnormal state, and whether the flow controller of the dynamic calibrator works properly.

[0046] Introduce the zero gas generated by the zero gas generator into the gaseous pollutant monitoring device, or use the dynamic calibrator to introduce the standard gas with a concentration of 80% of the measurement range of the monitoring device into the gaseous pollutant monitoring device.

[0047] In some embodiments, the length of the first period is between 0.5 and 5 minutes, and in one embodiment of the present invention, it is 1 minute for example.

[0048] In some embodiments, the preset quantity is between 3 and 10, and in one embodiment of the present invention, it is 5 for example.

[0049] In some embodiments, the length of the first period is 1 minute and the preset quantity is 5. Then the monitoring readings corresponding to each moment in the time sliding window at time t include:

[0050] x t ,x t-1 ,x t-2 ,x t-3 ,x t-4 。

[0051] The standard deviation of the monitoring readings corresponding to each moment in the time sliding window is calculated as:

[0052]

[0053] where sd(x t ) represents the standard deviation of the monitoring readings in the time sliding window at time t, x t represents the monitoring reading at time t, represents the mean value of the monitoring readings corresponding to each moment in the time sliding window,

[0054] If sd(x t)Greater than or equal to a preset threshold, then let t = t + 1, and repeat the calculation of the standard deviation in the time sliding window until sd(x t )is less than the preset threshold, indicating that the readings have become stable and subsequent operations can be performed.

[0055] In some embodiments, after obtaining the stable readings, it further includes:

[0056] If the stable readings exceed the preset range, then maintain the gaseous pollutant monitoring device.

[0057] Those skilled in the art should also be able to further realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0058] The steps of the methods or algorithms described in combination with the embodiments disclosed herein can be implemented by hardware, software modules executed by a processor, or a combination of the two. The software modules can be placed in a random access memory (RAM), memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium well-known in the technical field.

[0059] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention

[0060] Specification J2YXZSP240850CN

[0061] shall be included within the protection scope of the present invention.

Claims

1. A method for fast and stable reading of gaseous pollutant control inspection data, characterized in that: The following steps are involved: Pass a gas of a specific concentration into the gaseous pollutant monitoring device and record the monitoring readings every first period; Setting a time sliding window at a certain moment, wherein the time sliding window includes a preset number of moments corresponding to the monitoring readings including the certain moment; Calculate the standard deviation of the monitoring readings corresponding to each moment in the time sliding window; If the standard deviation is greater than or equal to the preset threshold, the time sliding window slides forward for at least one first period, and the calculation of the standard deviation is repeated; otherwise, the mean of the monitoring readings corresponding to each moment in the time sliding window is obtained; The mean is taken as the stable reading for the quality control check.

2. The method for fast and stable reading of gaseous pollutant control inspection data according to claim 1 is characterized in that: The quality control check includes a zero point check, and the specific concentration gas is zero gas.

3. The method for fast and stable reading of gaseous pollutant control inspection data according to claim 2 is characterized in that: If SO2, NO2 or O3 is used as the gaseous pollutant monitoring target, the set threshold is 1 ppb; If CO is used as the gaseous pollutant monitoring target, the set threshold is 1 ppm.

4. The method for rapid and stable reading of gaseous pollutant control inspection data according to claim 1 is characterized in that: The quality control inspection includes a span inspection, and the concentration of the specific concentration gas is between 70% and 100% of the full scale of the gaseous pollutant monitoring equipment.

5. The method for rapid and stable reading of gaseous pollutant control inspection data according to claim 4 is characterized in that: The set threshold is 0.5% of the span check point, and the span monitoring point is 70% to 100% of the full scale of the gaseous pollutant monitoring device.

6. The method for rapid and stable reading of gaseous pollutant control inspection data according to claim 1 is characterized in that: The length of the first cycle is between 0.5 and 5 minutes.

7. The method for rapid and stable reading of gaseous pollutant control inspection data according to claim 1, characterized in that: The preset number is between 3 and 10.

8. The method for rapid and stable reading of gaseous pollutant control inspection data according to claim 1 is characterized in that: The length of the first cycle is 1 minute, the preset number is 5, and the standard deviation of the monitoring readings corresponding to each moment in the time sliding window is calculated as follows: Where sd(x t ) represents the standard deviation of the monitoring readings in the time sliding window at time t, x t represents the monitoring reading at time t, Represents the mean of the monitoring readings corresponding to each moment in the time sliding window, 9. The method for rapid and stable reading of gaseous pollutant control inspection data according to claim 1, characterized in that: After obtaining the stable reading, the method further comprises: If the stable reading exceeds a preset range, the gaseous pollutant monitoring device is maintained.

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