CN109341976B - Method for detecting leakage of gas in test environment - Google Patents
Method for detecting leakage of gas in test environment Download PDFInfo
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- CN109341976B CN109341976B CN201811188594.8A CN201811188594A CN109341976B CN 109341976 B CN109341976 B CN 109341976B CN 201811188594 A CN201811188594 A CN 201811188594A CN 109341976 B CN109341976 B CN 109341976B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention provides a test environment gas leakage detection method, which comprises the following steps: s1, arranging a volatile component detection device at an opening and closing position of an experimental environment, and detecting the concentration of volatile gas in real time through the volatile component detection device; s2, establishing a first time set, and presetting a concentration safety threshold S0; s3, acquiring and recording the concentration values of the detected volatile gas at different moments of the volatile component detection device; s4, the concentration value S of the volatile gas acquired last time is obtained n And the concentration value S of the volatile gas obtained last time n‑1 Comparing; s52, judging whether the time length formed by the latest acquired acquisition time and the earliest acquired acquisition time in the first time set is greater than or equal to a preset risk threshold value; and S53, judging that the test environment leaks. The invention can automatically identify and ignore the transient opening of the experimental environment, namely, the manual opening of the experimental environment in the operation process is ignored. Thus, the reliability of the experimental environment leakage detection is improved, and incorrect alarms are avoided.
Description
Technical Field
The invention relates to the technical field of environmental safety detection, in particular to a method for detecting leakage of experimental environmental gas.
Background
Many gases generated in a laboratory are harmful, and the tightness of the experimental environment is very important, so that gas leakage detection is required. The existing experimental environment gas leakage detection is to measure the gas concentration. Thus, the volatilization of gas when the test environment is manually opened is also considered as environment leakage, and the recognition rate is low.
Disclosure of Invention
Based on the technical problems in the background technology, the invention provides a test environment gas leakage detection method.
The invention provides a test environment gas leakage detection method, which comprises the following steps:
s1, arranging a volatile component detection device at an opening and closing position of an experimental environment, and detecting the concentration of volatile gas in real time through the volatile component detection device;
s2, establishing a first time set, and presetting a concentration safety threshold S0;
s3, acquiring and recording the concentration values of the detected volatile gas at different moments of the volatile component detection device;
s4, the concentration value S of the volatile gas acquired last time is obtained n And the concentration value S of the volatile gas obtained last time n-1 Comparing; if S n ＝S n-1 Returning to the step S3;
if S n ＞S n-1 The following steps are performed:
s51, recording the collection time of the concentration value of the last volatile gas into a first time set;
s52, judging whether the time length formed by the latest acquired acquisition time and the earliest acquired acquisition time in the first time set is greater than or equal to a preset risk threshold value;
s53, judging that the test environment leaks; if not, returning to the step S3;
if S n ＜S n-1 The following steps are performed:
s61, judging the concentration value S of the volatile gas acquired last time n Whether it is less than or equal to the concentration safety threshold S0;
s62, if not, returning to the step S3; if yes, the first time set is emptied and the step S3 is returned.
Preferably, in step S3, the concentration value of the volatile gas is periodically collected by the volatile component detecting device.
Preferably, the acquisition period is 5-30s.
Preferably, in step S53, when S n ＞S n-1 When the time length formed by the latest acquired acquisition time and the earliest acquired acquisition time in the first time set is smaller than the risk threshold, adjusting the acquisition period of the concentration value of the volatile gas to a preset second acquisition period, and returning to the step S3; in step S62, S n ＜S n-1 And the last acquired volatile gas concentration value S n When the concentration safety threshold value S0 is smaller than or equal to the concentration safety threshold value S0, the first time set is emptied, the collection period of the concentration value of the volatile gas is adjusted to be a preset first collection period, and then the volatile gas is returnedReturning to the step S3; the second acquisition period is less than the first acquisition period.
Preferably, in step S51, the plurality of acquisition times in the first time set are arranged according to a time sequence.
Preferably, step S2 further includes establishing a second time set; step S61 further includes: recording the collection time of the last volatile gas concentration value into a second time set; when S is n ＜S n-1 Further comprising: S61A, calculating a difference value between the last acquisition time and the earliest acquisition time in the first time set as a reference value F1; in S62, when S n If the difference value Fn is greater than S0, comparing the difference value Fn between the last acquisition time and the earliest acquisition time in the second time set with a reference value F1, and judging F n ≤F 1 Whether +k is true, k is a calculation constant; if so, returning to the step S3; if not, carrying out environment ventilation abnormality alarm and returning to the step S3.
Preferably, in step S61, the acquisition times in the second time set are arranged sequentially.
Preferably, in step S4, the first collected volatile gas concentration value S n The concentration safety threshold S0 is defined as S n-1 And S is equal to n A comparison is made.
The invention provides a test environment gas leakage detection method, which is based on the concentration value S of the volatile gas acquired last time n And the concentration value S of the volatile gas obtained last time n-1 And comparing to judge the change trend of the concentration of the volatile gas outside the experimental environment, and further judging whether the experimental environment leaks or not according to the duration of the rising trend of the concentration of the volatile gas. Thus, the transient opening of the experimental environment can be automatically identified and ignored, namely, the manual opening of the experimental environment in the operation process is ignored. Thus, the reliability of the experimental environment leakage detection is improved, and incorrect alarms are avoided.
In the invention, the concentration value S of the current volatile gas is used for n The safety detection of the concentration of the volatile gas outside the experimental environment is realized by the magnitude judgment of the (2). In this step, at S n ＜S n-1 And last timeThe obtained concentration value S of the volatile gas n And when the concentration safety threshold value S0 is smaller than or equal to the concentration safety threshold value S0, the first time set is emptied and the step S3 is returned to facilitate the next time when the concentration of the volatile gas outside the experimental environment rises, the first time set is called again to judge the duration of the rising trend of the concentration of the volatile gas. Therefore, independent detection and judgment of the rising trend of the concentration of the volatile gas outside each experimental environment are realized, and the accuracy and effectiveness of experimental environment leakage detection are improved.
Drawings
FIG. 1 is a flow chart of a method for detecting leakage of experimental ambient gas according to embodiment 1;
FIG. 2 is a flow chart of a method for detecting leakage of experimental ambient gas according to embodiment 2;
fig. 3 is a flowchart of a test environmental gas leakage detection method according to embodiment 3.
Detailed Description
Example 1
Referring to fig. 1, the method for detecting leakage of experimental ambient gas provided by the invention comprises the following steps.
S1, arranging a volatile component detection device at an opening and closing position of an experimental environment, and detecting the concentration of volatile gas in real time through the volatile component detection device. So as to judge whether the experimental environment leaks or not according to the concentration of the volatile gas outside the experimental environment.
Specifically, in this embodiment, the open/close position of the experiment environment refers to a gap position between a part for controlling the on/off of the experiment environment and the outside, such as a door, and the experiment environment main body, for example, a door gap position of a laboratory cabinet. In this embodiment, install volatile component detection device in the crack position, can detect the volatile gas concentration variation of revealing very first time to improve experimental environment and reveal the timeliness of detecting.
S2, establishing a first time set, and presetting a concentration safety threshold S0.
S3, acquiring and recording the detected volatile gas concentration values of the volatile component detection device at different moments.
S4, volatilizing the last acquiredGas concentration value S n And the concentration value S of the volatile gas obtained last time n-1 A comparison is made. If S n ＝S n-1 And (3) returning to the step (S3) if no leakage occurs in the experimental environment within a period from the last volatile gas concentration value acquisition time to the current time.
Specifically, in step S4, for the first collected volatile gas concentration value S n The concentration safety threshold S0 is defined as S n-1 And S is equal to n A comparison is made.
If S n ＞S n-1 The following steps are performed:
s51, recording the collection time of the last volatile gas concentration value into a first time set. By this step, the acquisition time of each volatile gas concentration value in the detected volatile gas concentration rising process can be recorded.
S52, judging whether the time length formed by the latest acquired acquisition time and the earliest acquired acquisition time in the first time set is larger than or equal to a preset risk threshold. In this embodiment, the plurality of acquisition times in the first time set are arranged according to a time sequence, so that a time length formed by the latest acquired acquisition time and the earliest acquired acquisition time in the first time set is a length between the first time set and the first and last acquisition times. Therefore, the sequential arrangement of the acquisition time in the first time set is beneficial to improving the calculation efficiency of the time length, so that the instantaneity of detecting whether the experimental environment leaks or not by the method is improved.
And S53, judging that the test environment leaks. If not, returning to the step S3.
In this way, in the present embodiment, the volatile gas concentration value S obtained last time is used n And the concentration value S of the volatile gas obtained last time n-1 And comparing to judge the change trend of the concentration of the volatile gas outside the experimental environment, and further judging whether the experimental environment leaks or not according to the duration of the rising trend of the concentration of the volatile gas. Thus, the transient opening of the test environment can be automatically identified and ignored, i.e. the real state is ignoredThe environment is checked for manual opening during operation. Thus, the reliability of the experimental environment leakage detection is improved, and incorrect alarms are avoided.
If S n ＜S n-1 The following steps are performed:
s61, judging the concentration value S of the volatile gas acquired last time n Whether or not it is less than or equal to the concentration safety threshold S0.
S62, if not, returning to the step S3. If yes, the first time set is emptied and the step S3 is returned.
This step is performed by comparing the current volatile gas concentration value S n The safety detection of the concentration of the volatile gas outside the experimental environment is realized by the magnitude judgment of the (2). In this step, at S n ＜S n-1 And the last acquired volatile gas concentration value S n And when the concentration safety threshold value S0 is smaller than or equal to the concentration safety threshold value S0, the first time set is emptied and the step S3 is returned to facilitate the next time when the concentration of the volatile gas outside the experimental environment rises, the first time set is called again to judge the duration of the rising trend of the concentration of the volatile gas. Therefore, independent detection and judgment of the rising trend of the concentration of the volatile gas outside each experimental environment are realized, and the accuracy and effectiveness of experimental environment leakage detection are improved.
In step S3 of the present embodiment, the volatile gas concentration value is periodically collected by the volatile component detecting device. Specifically, the acquisition period is 5-30s.
Example 2
In step S53 of the present embodiment, as compared with embodiment 1, when S n ＞S n-1 And when the time length formed by the latest acquired acquisition time and the earliest acquired acquisition time in the first time set is smaller than the risk threshold, the acquisition period of the concentration value of the volatile gas is adjusted to a preset second acquisition period, and then the step S3 is returned. In step S62, S n ＜S n-1 And the last acquired volatile gas concentration value S n And when the concentration value is smaller than or equal to the concentration safety threshold S0, the first time set is emptied, the collection period of the concentration value of the volatile gas is adjusted to be a preset first collection period, and then the step S3 is returned. Second acquisitionThe period is less than the first acquisition period.
In this way, in this embodiment, in the rising process of the concentration of the volatile gas in the environment, the volatile gas detection period is shortened, which is favorable to improving the response efficiency when the experimental environment leaks, thereby improving the reliability of the environmental safety monitoring, and being favorable to avoiding the occurrence of risk events.
Example 3
In this embodiment, step S2 further includes establishing a second time set. Step S61 further includes: recording the collection time of the last volatile gas concentration value into a second time set.
When S is n ＜S n-1 Further comprising: S61A, calculating a difference value between the last acquisition time and the earliest acquisition time in the first time set as a reference value F1.
In S62, when S n If the difference value Fn is greater than S0, comparing the difference value Fn between the last acquisition time and the earliest acquisition time in the second time set with a reference value F1, and judging F n ≤F 1 Whether +k is true, k is a calculation constant; if so, returning to the step S3; if not, carrying out environment ventilation abnormality alarm and returning to the step S3.
In this way, in this embodiment, realized the comparison of volatile gas concentration decline speed and volatile gas concentration rising speed to realized the detection to the environmental ventilation effect, and in time found ventilation abnormal conditions, thereby overhauld, in order to guarantee the safety of experimental environment.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to apply equivalents and modifications to the technical solution and the inventive concept thereof within the scope of the present invention.
Claims (8)
1. The method for detecting the leakage of the experimental environmental gas is characterized by comprising the following steps of:
s1, arranging a volatile component detection device at an opening and closing position of an experimental environment, and detecting the concentration of volatile gas in real time through the volatile component detection device;
s2, establishing a first time set, and presetting a concentration safety threshold S0;
s3, acquiring and recording the concentration values of the detected volatile gas at different moments of the volatile component detection device;
s4, the concentration value S of the volatile gas acquired last time is obtained n And the concentration value S of the volatile gas obtained last time n-1 Comparing; if S n ＝S n-1 Returning to the step S3;
if S n ＞S n-1 The following steps are performed:
s51, recording the collection time of the concentration value of the last volatile gas into a first time set;
s52, judging whether the time length formed by the latest acquired acquisition time and the earliest acquired acquisition time in the first time set is greater than or equal to a preset risk threshold value;
s53, judging that the test environment leaks; if not, returning to the step S3;
if S n ＜S n-1 The following steps are performed:
s61, judging the concentration value S of the volatile gas acquired last time n Whether it is less than or equal to the concentration safety threshold S0;
s62, if not, returning to the step S3; if yes, the first time set is emptied and the step S3 is returned.
2. The method for detecting leakage of ambient gas according to claim 1, wherein in step S3, the concentration of the volatile gas is periodically collected by the volatile component detecting device.
3. The method for detecting leakage of test environmental gas according to claim 2, wherein the acquisition period is 5 to 30 seconds.
4. The method for detecting leakage of test environmental gas according to claim 1, wherein in step S53, when S n ＞S n-1 When the time length formed by the latest acquired acquisition time and the earliest acquired acquisition time in the first time set is smaller than the risk threshold, adjusting the acquisition period of the concentration value of the volatile gas to a preset second acquisition period, and returning to the step S3; in step S62, S n ＜S n-1 And the last acquired volatile gas concentration value S n When the concentration value is smaller than or equal to the concentration safety threshold value S0, the first time set is emptied, the collection period of the concentration value of the volatile gas is adjusted to be a preset first collection period, and then the step S3 is returned; the second acquisition period is less than the first acquisition period.
5. The method of claim 4, wherein in step S51, the plurality of collection times in the first time set are arranged according to a time sequence.
6. The method of claim 1, further comprising establishing a second time set in step S2; step S61 further includes: recording the collection time of the last volatile gas concentration value into a second time set; when S is n ＜S n-1 Further comprising: S61A, calculating a difference value between the last acquisition time and the earliest acquisition time in the first time set as a reference value F1; in S62, when S n If the difference value Fn is greater than S0, comparing the difference value Fn between the last acquisition time and the earliest acquisition time in the second time set with a reference value F1, and judging F n ≤F 1 Whether +k is true, k is a calculation constant; if so, returning to the step S3; if not, carrying out environment ventilation abnormality alarm and returning to the step S3.
7. The method of claim 6, wherein in step S61, the collection times in the second time set are arranged sequentially.
8. The test environmental gas leakage detection method according to any one of claims 1 to 7, whereinIn step S4, for the first collected volatile gas concentration value S n The concentration safety threshold S0 is defined as S n-1 And S is equal to n A comparison is made.
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