CN112033865A - Gas detection system and detection method - Google Patents
Gas detection system and detection method Download PDFInfo
- Publication number
- CN112033865A CN112033865A CN202010964968.1A CN202010964968A CN112033865A CN 112033865 A CN112033865 A CN 112033865A CN 202010964968 A CN202010964968 A CN 202010964968A CN 112033865 A CN112033865 A CN 112033865A
- Authority
- CN
- China
- Prior art keywords
- detection
- gas
- tvoc
- sensor
- module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 239
- 230000010365 information processing Effects 0.000 claims abstract description 25
- 238000005070 sampling Methods 0.000 claims abstract description 12
- 238000012545 processing Methods 0.000 claims abstract description 6
- 239000013618 particulate matter Substances 0.000 claims description 44
- 238000005259 measurement Methods 0.000 claims description 21
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 5
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 5
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 4
- 239000001569 carbon dioxide Substances 0.000 claims description 4
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims description 3
- 150000004767 nitrides Chemical class 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims 4
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 78
- 230000008859 change Effects 0.000 description 13
- 238000004891 communication Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000011897 real-time detection Methods 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- 150000001555 benzenes Chemical class 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
-
- 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
-
- 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
- G01N33/0004—Gaseous mixtures, e.g. polluted air
-
- 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
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0031—General constructional details of gas analysers, e.g. portable test equipment concerning the detector comprising two or more sensors, e.g. a sensor array
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N2015/0042—Investigating dispersion of solids
- G01N2015/0046—Investigating dispersion of solids in gas, e.g. smoke
-
- 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
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0047—Organic compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Pathology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Immunology (AREA)
- Engineering & Computer Science (AREA)
- Dispersion Chemistry (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Sampling And Sample Adjustment (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The application discloses a gas detection system and a gas detection method, which are suitable for monitoring the air quality of an air channel in real time on line. The gas detection system includes: the sampling module is used for collecting gas to be detected in the air duct in real time; the detection module is connected with the sampling module and is used for detecting the collected gas to be detected in real time through a plurality of sensors; the information processing module is connected with the detection module and is used for acquiring detection data of the detection module and processing the detection data in real time to obtain a detection result; the detection module comprises a first detection unit and a second detection unit, the first detection unit is connected with the second detection unit, gas to be detected is preliminarily detected and processed through the first detection unit, the gas to be detected is detected through the second detection unit, and the second detection unit can be compensated by detection data of the first detection unit, so that deviation of detection results is reduced, and stability and reliability of the detection results are enhanced.
Description
Technical Field
The invention relates to a gas detection technology, in particular to a gas real-time detection system and a gas real-time detection method.
Background
Air quality has a significant impact on human health, and pollutants in the air are causative factors of many diseases. At present, the pollutants harmful to human bodies in the air mainly comprise: fine particulate matter (PM2.5) having a diameter of less than 2.5 microns and dust particulate matter PM10 having a diameter of less than 10 microns, as well as Total Volatile Organic Compounds (TVOC), carbon monoxide, ozone, and the like. PM2.5/PM10 is the main component of haze pollutants at present, and TVOC comprises aldehydes, benzenes, ammonia gas and other volatile gases. With the improvement of the requirement for environmental protection, more and more factories exhaust emission air ducts and public building air ducts are required to be provided with gas detection devices to monitor the exhaust gas and whether the indoor air environment of public places meets the standards.
Most of existing real-time gas detection devices can only detect single gas in an air duct, such as carbon dioxide, carbon monoxide and the like, and few detection devices which can be used for monitoring PM2.5 or TVOC in the air duct are provided, but the gas in the air duct is pumped into the detection devices by adopting an air pump to pump air, and then the gas in the detection devices is subjected to sensing measurement. The air pump is adopted for air extraction, the service life of the air pump is short, and the air pump is easy to break down and damage after real-time long-term operation. Meanwhile, due to the fact that different air duct pressures and flows are different, the pressures and flows in the same air duct in different time periods can change, and if the air pump works intermittently, the air flow can change, the measured value of PM2.5/PM10 can change along with the difference of the air flow, the measurement deviation is large due to unstable air flow, and the measurement accuracy and precision cannot be guaranteed. Further, the temperature and humidity in the air duct may also change, and the temperature and humidity change may also affect the detection results of PM2.5/PM10 and TVOC. The deviation of the measured value of TVOC among the prior art is very big usually, because the air mass concentration in the wind channel is different among the different projects for the TVOC sensor can't correctly find the benchmark in long-term use, leads to providing accurate TVOC value.
Therefore, it is an urgent need to solve the problem in the prior art to design a gas detection device suitable for stably monitoring multiple parameters in an air duct for a long time.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a gas detection system, in which a detection module of the gas detection system includes a sampling module for collecting a gas to be detected in an air duct in real time; the detection module is provided with a plurality of sensors and is connected with the sampling module, and the detection module detects the collected gas to be detected in real time through the plurality of sensors; the information processing module is connected with the detection module and used for acquiring detection data of the detection module and processing the detection data in real time to acquire a detection result; the detection module comprises a first detection unit and a second detection unit, the first detection unit is connected with the second detection unit, the first detection unit comprises a fan, and the fan controls the flow of gas to be detected in the detection module to be within a preset range.
Preferably, the sensing data of the first detecting unit is further used for compensating a part of the sensors of the second detecting unit.
Preferably, the second detection unit comprises a particulate matter sensor, the rotating speed of the fan is controlled to obtain a constant flow of gas to be detected, the detection data of the particulate matter sensor is obtained under the same flow, and the influence of the gas flow on the detection data of the particulate matter sensor is avoided.
Preferably, the first detection unit includes a temperature and humidity sensor, the second detection unit includes a TVOC sensor and/or a particulate matter sensor, and the information processing module performs data compensation processing on the TVOC sensor and/or the particulate matter sensor according to detection data of the temperature and humidity sensor to reduce influence of temperature and humidity change on detection results of the TVOC sensor and/or the particulate matter sensor.
Preferably, when the ambient temperature is greater than TaThen, carrying out temperature compensation on the TVOC sensor; when the ambient humidity is greater than RHaThen, the TVOC sensor is subjected to humidity compensation, wherein TaAs reference temperature value, RHaAnd the reference temperature value and the reference humidity value are pre-stored in the information processing module.
Preferably, the detection module includes a TVOC sensor, the information processing module prestores a reference value, calculates a TVOC measurement value by continuously reading, compares the measurement value with the TVOC reference value, and selects the smaller of the TVOC reference value and the TVOC measurement value as a baseline value of the TVOC.
Preferably, the collection module includes a collection tube, one end of the collection tube is connected to the detection module, the other end of the collection tube extends into the air duct to collect the gas to be detected, the collection tube is composed of two opposite sides and is respectively provided with an airflow introduction groove and an airflow discharge groove, the airflow introduction groove is located on the windward side, the airflow discharge groove is located on the leeward side, the gas to be detected enters the detection module from the airflow introduction groove on the windward side of the collection tube, and the gas to be detected flows into the detection module from the airflow introduction groove and flows out from the airflow discharge groove according to the pressure difference between the windward side and the leeward side of the collection tube.
Preferably, the plurality of sensors further comprises at least one of a carbon dioxide sensor, a carbon monoxide sensor, a formaldehyde sensor, an ozone sensor, a sulfide sensor, a nitride sensor.
According to another aspect of the present invention, there is also provided a gas detection method using the gas detection system, including the steps of: the sampling module acquires gas to be detected in the air duct; controlling the fan rotating speed of the detection module to be constant, so that the flow of the gas to be detected in the detection module is within a preset range; acquiring temperature and humidity detection data of gas to be detected through a temperature and humidity sensor; acquiring particulate matter detection data through a particulate matter sensor; the TVOC detection data of the gas to be detected are acquired by combining the TVOC sensor with the TVOC baseline value; and compensating the particulate matter detection data and the TVOC detection data according to the temperature and humidity detection data to obtain a detection result that the temperature and humidity influence of the particulate matter and the TVOC is eliminated.
Preferably, the method further comprises: and adjusting the TVOC baseline value, calculating the TVOC real-time measurement value through continuous reading, comparing the measurement value with a TVOC reference value prestored in the information processing module, and selecting the smaller of the TVOC reference value and the measurement value as the baseline value of the TVOC.
In summary, the implementation of the present invention has the following advantages or beneficial effects: the gas detection system can monitor the air quality of the air channel in real time on line, the gas detection system divides the detection module into a first detection unit and a second detection unit, gas to be detected is preliminarily detected and processed through the first detection unit, the flow of the gas to be detected is kept constant, temperature and humidity detection data of the gas to be detected is obtained, the gas to be detected passes through the first detection unit, the state of the gas to be detected is more stable, the accuracy and reliability of detection information of the second detection unit can be effectively improved, detection data of the first detection unit can be used for compensating detection information of the second detection unit, and the influence of detection item change of a non-second detection unit on the detection result is reduced. Furthermore, the TVOC reference value is preset for TVOC detection by the gas detection system, and the TVOC reference value is ensured to be used as a reference under different use environments. The detection system has stronger reliability and longer service life. The detection method based on the detection system effectively reduces the influence of the non-detection item change of the gas to be detected on the detection result of the individual sensor through flow control and temperature and humidity compensation, so that the detection result is more stable and reliable compared with the prior art, and the actual condition of the gas to be detected can be fed back.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a gas detection system according to an embodiment of the present invention.
FIG. 2 is a schematic structural diagram of a gas detection system according to an embodiment of the present invention.
FIG. 3 is a schematic diagram of a detection method of the gas detection system of the present invention.
Detailed Description
Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by the same or similar reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.
The present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, and procedures have not been described in detail so as not to obscure the present invention.
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples.
FIG. 1 is a schematic diagram of an embodiment of the gas detection system of the present invention, which can be seen to include: a sampling module 110, a detection module 120 and an information processing module 130, wherein the detection module 120 comprises a first detection unit 121 and a second detection unit 122. One end of the collection module 110 is connected to the air duct 10, and the other end is connected to the detection module 120, specifically, an arrow in the drawing indicates a gas flow direction, and after the gas to be detected in the air duct 10 passes through the sampling module 110, passes through the first detection unit 121, enters the second detection unit 122, and then flows back to the air duct 10 through the first detection unit 121 and the sampling module 110; the information processing module 130 is electrically connected to the first detection unit 121 and the second detection unit 122 of the detection module 120, respectively, to control the first detection unit 121 and the second detection unit 122 and to acquire detection information thereof.
Further, the first detection unit 121 includes, for example, a fan, a temperature and humidity sensor, etc., the second detection unit 122 includes, for example, a particulate matter sensor, a TVOC sensor, etc., and the first detection unit 121 controls the rotation speed of the fan to control the flow rate of the gas to be detected in the detection module 120 within a predetermined range and keep the flow rate stable, so that the particulate matter sensor can obtain the particulate matter detection information at a specific flow rate, so as to ensure that the detection information of the particulate matter sensor is not affected by the flow rate of the gas to be detected. Similarly, the temperature and humidity detection information of the gas to be detected is acquired through the temperature and humidity sensor, and the information processing module 130 compensates the detection information of the particulate matter sensor and the TVOC sensor according to the temperature and humidity monitoring information, so that the influence of the temperature and humidity change of the gas to be detected on the detection results of the particulate matter and the TVOC is reduced, the detection results are more real and reliable, and the occurrence of false fluctuation and false alarm is reduced. Certainly, the information processing module 130 may further include a communication unit and an alarm unit (not shown in the figure), where the communication unit is configured to communicate with an external device and a communication system, and the communication unit includes at least one of a wired communication RS485, an ethernet interface, a wireless communication WIFI, and a GPRS; the wired communication RS485 can be a basic communication interface, and one or more of the other three communication interfaces can be selected for use. The alarm unit is used for alarming in an abnormal state, and when the detection result exceeds a preset safe fluctuation range for a certain time, the alarm unit gives an alarm in at least one mode of vibration, light and sound to remind related personnel of detecting the abnormal parameters so as to find out problems in time and carry out troubleshooting.
Certainly, the gas detection system provided by the present invention may also modify the baseline value periodically or according to the actual usage environment according to the operation instruction, taking the TVOC sensor as an example, the information processing module 130 pre-stores a TVOC reference value, when the TVOC sensor detects, the TVOC reference value is initially taken as the baseline value, and when a period of detection elapses or according to the operation instruction, the information processing module 130 continuously modifies the baseline value, compares the TVOC detection information and the TVOC reference value in the current environment, and selects a smaller one of the TVOC reference value as the new baseline value of the TVOC, so as to calculate and output the detection result of the TVOC more accurately.
Of course, the detecting module 120 may further include various sensors such as a carbon dioxide sensor, a carbon monoxide sensor, a formaldehyde sensor, an ozone sensor, a sulfide sensor, and a nitride sensor to detect various parameters of the gas to be detected.
Fig. 2 is a schematic structural diagram of an embodiment of the gas detection system of the present invention, in which a gas flow direction in the air duct 10 is from left to right, for example, the detection module and the information processing module are both located in the housing 20, for example, the acquisition module 110 includes an acquisition tube 111 and a flange 112, for example, the acquisition tube 111 is designed in a pitot tube manner, an airflow introduction groove of the acquisition tube 111 is located on a windward side, an airflow discharge groove is located on a leeward side, the gas to be detected enters the detection module from the airflow introduction groove on the windward side of the acquisition tube 111, the gas to be detected flows into the detection module from the airflow introduction groove according to a pressure difference between the windward side and the leeward side of the acquisition tube 111, and then flows out from the airflow discharge groove on the leeward side. The design does not need a pump to drive, has simple structure, saves energy, has long service life, is not easy to block, and ensures that the system can stably run for a long time. The flange plate 112 is used for fixing the collecting pipe 111 and ensuring the orientation of the collecting pipe 111, for example, the flange plate 112 and the collecting pipe 111 are designed as an integral type, the orientation of the windward side of the collecting pipe can be identified on the flange plate to ensure the accuracy of the installation direction, one end of the collecting pipe is connected with the detection module in the shell 20, and the other end of the collecting pipe extends into the air duct 10 to collect the gas to be detected.
Furthermore, only the part of the acquisition module 110 in the system extends into the air duct 10, and the rest of the system is positioned outside the air duct 10, so that the influence of the adverse environment in the air duct 10 on the system is effectively reduced, the flow of the gas to be measured is adjusted through the fan, the flow is kept stable, the particulate matter measurement value (PM2.5/PM10) of the system is more accurate and stable, the gas to be measured is not required to be extracted by an air pump, the cost is lower, the service life is longer, and the maintenance is not required.
FIG. 3 is a schematic diagram of a detection method of the gas detection system of the present invention, the detection method comprising the steps of:
s10, the sampling module acquires the gas to be detected in the air duct;
s20, controlling the fan speed of the detection module to be constant; the fan is located at an airflow inlet of the detection module, and the flow of the gas to be detected in the detection module is stabilized within a preset range by controlling the rotating speed of the fan;
s30, acquiring temperature and humidity detection data of the gas to be detected through a temperature and humidity sensor;
s40, acquiring particulate matter detection data through a particulate matter sensor; because the flow of the gas to be detected in the controllable detection module of fan, when the gas flow that awaits measuring is steady for the specified value, detect the gas that awaits measuring by particulate matter sensor, acquire its particulate matter detection data for the particulate matter detection data that acquire are acquireed under the same flow condition, have avoided the different interference to particulate matter detection of flow.
S50, TVOC detection data of the gas to be detected is obtained through the TVOC sensor, and further the TVOC detection data of the gas to be detected can be obtained through combination of a TVOC baseline value, so that the data are more accurate;
s60, compensating the particulate matter and the TVOC detection data according to the temperature and humidity parameters to obtain a particulate matter measurement value and a TVOC measurement value. The temperature characteristic curve and the humidity characteristic curve that have particulate matter detection and TVOC detection's specific compensation algorithm and corresponding sensor in advance in the information processing module, acquire corresponding compensation proportion according to the humiture detection data contrast characteristic curve that temperature and humidity sensor acquireed, compensate particulate matter detection data and TVOC detection data to obtain particulate matter and TVOC's testing result, reduce the influence of humiture change to particulate matter and TVOC testing result, make the testing result more reliable and more stable.
Further, the information processing module in the gas detection system of the present invention prestores the temperature characteristic curve and the humidity characteristic curve of the particulate matter sensor and the TVOC sensor, and the characteristic curves are obtained by curve fitting according to the obtained multiple detection data through multiple test detections, for example, naturally, in order to further improve the accuracy of the characteristic curves, the curves may be segmented and then fitted to obtain the characteristic curves of the particulate matter sensor and the TVOC sensor in different interval ranges, so as to improve the accuracy of the characteristic curves.
When the ambient temperature is greater than TaWhen enabled, the TVOC sensor is temperature compensated in a manner wherein TaIs a reference temperature value, reference temperature value TaThe compensation is prestored in the information processing module, and the specific compensation comprises the following steps:
calculating the output value V of the temperature compensated sensorN，
When V isN＜V1The method comprises the following steps:
when V isN≥V1The method comprises the following steps:
wherein, VNIs the output value V of the TVOC sensor after temperature compensationrTo compensate for the output value of the TVOC sensor before compensation, StFor the compensation ratio obtained from the temperature characteristic curve of the TVOC sensor, N0、N1、N2For three pre-stored calibration points TVOC calibration value, V0、V1、V2And N is a finally compensated TVOC measured value.
Specifically, taking temperature compensation of the TVOC sensor as an example, TaFor example, 20 ℃, if the current ambient temperature is 30 ℃, then starting temperature compensation, referring to a temperature characteristic curve of a particulate matter sensor prestored in the information processing module, when the temperature in the temperature characteristic curve is 20 ℃, the output value of the TVOC sensor is 1000, keeping the other parameters of the external environment except the temperature unchanged, when the temperature in the temperature characteristic curve is 30 ℃, the output value of the TVOC sensor is 800, and then the compensation proportion S of the current ambient temperature ist800/1000, according to the compensation ratio StAnd a TVOC calibration value N existing in the information processing module0、N1、N2And its corresponding index point output value V0、V1、V2And output value V of TVOC sensor before compensationrAnd processing to obtain a final compensated TVOC measured value N according to the compensation formula.
Similarly, the humidity compensation mode of the humidity compensation mode and the temperature and humidity compensation mode of the particulate matter sensor are similar to the temperature compensation mode, and are not repeated herein, the temperature and humidity characteristic curves of the TVOC sensor and the particulate matter sensor are different, the compensation proportions of the TVOC sensor and the particulate matter sensor are also different, and different compensation proportions are selected according to different sensors to participate in compensation calculation, so that the measurement value of the sensor is closer to the actual parameters in the environment, the measurement accuracy is enhanced, and the influence of rainy days or air temperature change on the measurement value of the sensor is reduced.
Furthermore, in order to reduce the deviation of TVOC detection, a TVOC reference value is also prestored in the information processing module, when the TVOC sensor detects, the TVOC reference value is initially used as a baseline value, after a period of detection or according to an operation instruction, the baseline value is corrected and adjusted by the information processing module, and by comparing the sizes of the TVOC detection information and the TVOC reference value in the current environment, a smaller one of the TVOC reference value and the TVOC reference value is selected as a new baseline value of the TVOC, so that the detection deviation is reduced by more accurately calculating and outputting the detection result of the TVOC.
The gas detection method reduces the influence of part of non-target detection item changes on the detection result, and solves the problems that the measured value is drifted, inaccurate and incapable of reflecting the actual situation in a complex environment.
In summary, the implementation of the present invention has the following advantages or beneficial effects: the gas detection system can monitor the air quality of the air channel in real time on line, the gas detection system divides the detection module into a first detection unit and a second detection unit, gas to be detected is preliminarily detected and processed through the first detection unit, the flow of the gas to be detected is kept constant, specific flow and temperature and humidity detection data of the gas to be detected are obtained, the gas to be detected passes through the first detection unit, the state of the gas to be detected is more stable, the accuracy and reliability of detection information of the second detection unit can be effectively improved, detection data of the first detection unit can be used for compensating detection information of the second detection unit, and the influence of detection item change of a non-second detection unit on the detection result is reduced. Furthermore, the gas detection system sets a TVOC reference value aiming at TVOC detection, the reference value can be used as a baseline value, and the standard baseline value is ensured to be used as a reference under different use environments. The detection system has stronger reliability and longer service life. The detection method based on the detection system effectively reduces the influence of the non-detection item change of the gas to be detected on the detection result of the individual sensor through flow control and temperature and humidity compensation, so that the detection result is more stable and reliable compared with the prior art, and the actual condition of the gas to be detected can be fed back.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
While embodiments in accordance with the present invention have been illustrated and described above with particularity, the drawings are not necessarily to scale, the proportions and dimensions shown therein are not intended to limit the spirit and scope of the invention, and the embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. A gas detection system, comprising:
the sampling module is used for collecting gas to be detected in the air duct in real time;
the detection module is provided with a plurality of sensors and is connected with the sampling module, and the detection module detects the collected gas to be detected in real time through the plurality of sensors;
the information processing module is connected with the detection module and used for acquiring detection data of the detection module and processing the detection data in real time to acquire a detection result;
the detection module comprises a first detection unit and a second detection unit, the first detection unit is connected with the second detection unit, the first detection unit comprises a fan, and the fan controls the flow of gas to be detected in the detection module to be within a preset range.
2. The gas detection system of claim 1, wherein the sensed detection data of the first detection unit is further used to compensate for a portion of the sensors of the second detection unit.
3. The gas detection system of claim 1, wherein the second detection unit comprises a particle sensor, and the particle sensor is configured to obtain the detection data of the particle sensor at a constant flow rate by controlling the rotation speed of the fan, so as to avoid the influence of the gas flow rate on the detection data of the particle sensor.
4. The gas detection system according to claim 2, wherein the first detection unit includes a temperature and humidity sensor, the second detection unit includes a TVOC sensor and/or a particulate matter sensor, and the information processing module performs data compensation processing on the TVOC sensor and/or the particulate matter sensor according to detection data of the temperature and humidity sensor to reduce an influence of temperature and humidity changes on a detection result of the TVOC sensor and/or the particulate matter sensor.
5. The gas detection system of claim 4, wherein when the ambient temperature is greater than TaThen, carrying out temperature compensation on the TVOC sensor; when the ambient humidity is greater than RHaThen, the TVOC sensor is subjected to humidity compensation, wherein TaAs reference temperature value, RHaAnd the reference temperature value and the reference humidity value are pre-stored in the information processing module.
6. The gas detection system of claim 1, wherein the detection module includes a TVOC sensor, and the information processing module prestores a reference baseline value, calculates a TVOC measurement value by continuous reading, compares the measurement value to the TVOC reference baseline value, and selects the smaller of the TVOC reference baseline value and the TVOC measurement value as the baseline value of the TVOC.
7. The gas detection system of claim 1, wherein the collection module comprises a collection tube, one end of the collection tube is connected to the detection module, and the other end of the collection tube extends into the air duct to collect the gas to be detected, the collection tube is composed of two opposite sides and is provided with a gas flow introduction groove and a gas flow discharge groove respectively, the gas flow introduction groove is located on a windward side, the gas flow discharge groove is located on a leeward side, the gas to be detected enters the detection module from the gas flow introduction groove on the windward side of the collection tube, and the gas to be detected flows into the detection module from the gas flow introduction groove and flows out from the gas flow discharge groove according to the pressure difference between the windward side and the leeward side of the collection tube.
8. The gas detection system of claim 4, wherein the plurality of sensors further comprises at least one of a carbon dioxide sensor, a carbon monoxide sensor, a formaldehyde sensor, an ozone sensor, a sulfide sensor, a nitride sensor.
9. A method of gas detection, comprising the steps of:
the sampling module acquires gas to be detected in the air duct;
controlling the fan rotating speed of the detection module to be constant, so that the flow of the gas to be detected in the detection module is within a preset range;
acquiring temperature and humidity detection data of gas to be detected through a temperature and humidity sensor;
acquiring particulate matter detection data through a particulate matter sensor;
the TVOC detection data of the gas to be detected are acquired by combining the TVOC sensor with the TVOC baseline value;
and compensating the particulate matter detection data and the TVOC detection data according to the temperature and humidity detection data to obtain a detection result that the temperature and humidity influence of the particulate matter and the TVOC is eliminated.
10. The detection method according to claim 9, further comprising:
and adjusting the TVOC baseline value, calculating the TVOC real-time measurement value through continuous reading, comparing the measurement value with a TVOC reference value prestored in the information processing module, and selecting the smaller of the TVOC reference value and the measurement value as the baseline value of the TVOC.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010964968.1A CN112033865A (en) | 2020-09-14 | 2020-09-14 | Gas detection system and detection method |
| GB2300525.9A GB2614967A (en) | 2020-09-14 | 2020-11-24 | Gas detection system and detection method |
| PCT/CN2020/131091 WO2022052319A1 (en) | 2020-09-14 | 2020-11-24 | Gas detection system and detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010964968.1A CN112033865A (en) | 2020-09-14 | 2020-09-14 | Gas detection system and detection method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112033865A true CN112033865A (en) | 2020-12-04 |
Family
ID=73590338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010964968.1A Pending CN112033865A (en) | 2020-09-14 | 2020-09-14 | Gas detection system and detection method |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN112033865A (en) |
| GB (1) | GB2614967A (en) |
| WO (1) | WO2022052319A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113075264A (en) * | 2021-03-30 | 2021-07-06 | 北京艾森泰科科技有限责任公司 | Method and device for calculating odor concentration value through sensor signal value fitting |
| CN114715852A (en) * | 2022-03-17 | 2022-07-08 | 东莞蓝创捷特佳电子有限公司 | Ozone generator concentration control method based on temperature and humidity |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012042399A (en) * | 2010-08-20 | 2012-03-01 | Shimizu Corp | Detecting method and detecting device for tvoc, and outside air intake control system |
| CN103217369A (en) * | 2013-05-06 | 2013-07-24 | 许楷楠 | Field lampblack test device |
| CN203443606U (en) * | 2013-08-20 | 2014-02-19 | 南车二七车辆有限公司 | Indoor pollution gas concentration monitoring device |
| CN203941150U (en) * | 2014-06-09 | 2014-11-12 | 何颖 | A kind of novel portable binary channels air quality monitor |
| CN207516208U (en) * | 2017-11-07 | 2018-06-19 | 北京中立格林传感科技股份有限公司 | Gas-detecting device |
| CN111103395A (en) * | 2018-10-29 | 2020-05-05 | 三星电子株式会社 | Gas sensing device, electronic device comprising same and gas sensing system |
| CN210486945U (en) * | 2019-07-25 | 2020-05-08 | 北京中立格林传感科技股份有限公司 | Gas detection device |
| CN111141878A (en) * | 2020-02-18 | 2020-05-12 | 苏州源慧达智能科技有限公司 | Air quality monitoring system |
| CN210665640U (en) * | 2019-09-12 | 2020-06-02 | 北京燕山玉龙石化工程股份有限公司 | Tail gas detection device |
-
2020
- 2020-09-14 CN CN202010964968.1A patent/CN112033865A/en active Pending
- 2020-11-24 WO PCT/CN2020/131091 patent/WO2022052319A1/en active Application Filing
- 2020-11-24 GB GB2300525.9A patent/GB2614967A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012042399A (en) * | 2010-08-20 | 2012-03-01 | Shimizu Corp | Detecting method and detecting device for tvoc, and outside air intake control system |
| CN103217369A (en) * | 2013-05-06 | 2013-07-24 | 许楷楠 | Field lampblack test device |
| CN203443606U (en) * | 2013-08-20 | 2014-02-19 | 南车二七车辆有限公司 | Indoor pollution gas concentration monitoring device |
| CN203941150U (en) * | 2014-06-09 | 2014-11-12 | 何颖 | A kind of novel portable binary channels air quality monitor |
| CN207516208U (en) * | 2017-11-07 | 2018-06-19 | 北京中立格林传感科技股份有限公司 | Gas-detecting device |
| CN111103395A (en) * | 2018-10-29 | 2020-05-05 | 三星电子株式会社 | Gas sensing device, electronic device comprising same and gas sensing system |
| CN210486945U (en) * | 2019-07-25 | 2020-05-08 | 北京中立格林传感科技股份有限公司 | Gas detection device |
| CN210665640U (en) * | 2019-09-12 | 2020-06-02 | 北京燕山玉龙石化工程股份有限公司 | Tail gas detection device |
| CN111141878A (en) * | 2020-02-18 | 2020-05-12 | 苏州源慧达智能科技有限公司 | Air quality monitoring system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113075264A (en) * | 2021-03-30 | 2021-07-06 | 北京艾森泰科科技有限责任公司 | Method and device for calculating odor concentration value through sensor signal value fitting |
| CN114715852A (en) * | 2022-03-17 | 2022-07-08 | 东莞蓝创捷特佳电子有限公司 | Ozone generator concentration control method based on temperature and humidity |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022052319A1 (en) | 2022-03-17 |
| GB2614967A (en) | 2023-07-26 |
| GB202300525D0 (en) | 2023-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11067553B2 (en) | Method for determination and isolation of abnormal sub-sensors in a multi-core sensor | |
| CN201335967Y (en) | On-line monitoring system for emission of industrial fumes and flue gases | |
| CN103033399B (en) | Atmospheric multiparameter transmitter for PM2.5 particulate matter monitor and use method thereof | |
| CN101354394B (en) | Expiration nitric oxide detection device | |
| EP2028454A1 (en) | An environmental monitoring apparatus and method thereof | |
| WO2020071964A1 (en) | Measuring device, system and method for measuring a mass concentration of dust particles | |
| CN101354332A (en) | Laser powder dust detector with humidity continuous self-correcting function and detecting method thereof | |
| CN112033865A (en) | Gas detection system and detection method | |
| CA2731162A1 (en) | System and method for dynamically controlling odor emission | |
| CN105675801A (en) | Continuous flue gas emission monitoring system | |
| CN105823511A (en) | Textile enterprise environmental monitoring system and method | |
| CN202994770U (en) | System for monitoring smoke continuously | |
| CN201662568U (en) | Carbon monoxide detection system of novel coal mill | |
| WO2022093864A4 (en) | Methods and apparatus for measuring methane emissions with an optical open-cavity methane sensor | |
| CN112611611A (en) | Smoke constant-speed sampling device with temperature compensation function | |
| CN111896590A (en) | Sensor device and self-calibration method and system thereof | |
| CN205966710U (en) | Ventilation hood panel air -speed control system | |
| CN111398520A (en) | Air ion outdoor detector and control method thereof | |
| CN102778445A (en) | Intelligent analyzer and detection method for standard state dry basis | |
| CN108627202B (en) | Intelligent monitoring device for industrial flue gas | |
| CN111896591A (en) | Self-calibration gas sensor device and calibration method and system thereof | |
| CN108061631B (en) | Test method for measuring leakage of grate seal structure | |
| CN206787873U (en) | A kind of wind speed measurement type air/particle sampler | |
| CN113686746B (en) | PM (particulate matter) 2.5 Online mass concentration real-time compensation device and method | |
| CN108152090A (en) | A kind of smoke dust sampling device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |