CN112798673A - Multi-parameter malodorous gas concentration online monitoring method - Google Patents
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- 238000005259 measurement Methods 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 claims description 86
- 238000004891 communication Methods 0.000 claims description 22
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- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000012549 training Methods 0.000 claims description 3
- 239000003344 environmental pollutant Substances 0.000 description 5
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- 241000463219 Epitheca Species 0.000 description 2
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Abstract
The invention provides a multi-parameter on-line monitoring method for the concentration of malodorous gas, which is used for a multi-parameter on-line monitoring system for the concentration of malodorous gas, wherein the multi-parameter on-line monitoring system for the concentration of malodorous gas comprises a gas sensor detection unit, and the gas sensor detection unit is a sensor module consisting of a plurality of electrochemical sensors; the sensor module is used for presetting the relation between the measurement concentration of the sensor module and the output voltage value of the sensor module; when the concentration of n kinds of gas to be measured is measured, the original voltage matrix measured by the sensor module is substituted into the relation, and the concentration matrix of the gas to be measured can be obtained. The invention solves the problem of cross interference of the sensor by using an intelligent algorithm, improves the accuracy of the detection result of the sensor and leads the measurement result of the gas concentration to be more accurate.
Description
Technical Field
The invention belongs to the technical field of gas online monitoring, and particularly relates to a multi-parameter malodorous gas concentration online monitoring method.
Background
The existing malodorous gas detection mainly depends on two modes of manual sample feeding detection and on-line detection, wherein the manual sample feeding has the characteristics of poor effectiveness, high cost, certain subjectivity and the like; the on-line detection equipment mostly adopts a pump suction type, and adopts a plurality of sensors with independent air chambers to monitor several controlled gases through series air paths.
The existing gridding odor on-line monitor mostly adopts the detection principle of an electrochemical sensor and a metal oxide sensor to detect the concentration of odor characteristic pollutants. The sensors utilize the oxidation-reduction reaction generated by the characteristic components of the gas to be detected and the interface of the electrolyte solution in the sensors, convert the reaction into an electric signal value, and convert the electric signal value into a corresponding pollutant concentration value through digital processing. As shown in fig. 5, the monitoring instrument integrates a plurality of characteristic pollutant electrochemical sensors for monitoring the concentration of a plurality of pollutants on site, and uploads monitoring data to the server in a wired or wireless mode at regular time, so that low cost, long time, high real time, convenient installation, simple operation and maintenance, unattended operation and online monitoring are realized finally.
In the schematic block diagram of the conventional multi-parameter malodorous gas concentration online monitor shown in fig. 5, each sensor is provided with an independent gas path unit and two gas path interfaces, and during the maintenance process of a single sensor, the risk of a gas path leak point is high, so that the gas tightness of a gas path cannot be effectively ensured, and the measurement result is greatly influenced. In addition, in the scheme, the odor concentration OU is measured by using an independent metal oxide sensor, so that the accuracy of an odor concentration measurement result under the condition of gas cross interference cannot be ensured.
In order to solve the above problems, we have always sought an ideal technical solution,
disclosure of Invention
The invention aims to provide a multi-parameter malodorous gas concentration online monitoring method aiming at the defects of the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that:
a multi-parameter on-line monitoring method for the concentration of malodorous gas is used for a multi-parameter on-line monitoring system for the concentration of malodorous gas, wherein the multi-parameter on-line monitoring system for the concentration of malodorous gas comprises a gas sensor detection unit, and the gas sensor detection unit is a sensor module consisting of a plurality of electrochemical sensors;
the sensor module presets the relation between the measurement concentration Y of the sensor module and the output voltage value X of the sensor module:
wherein K is a coefficient matrix, and B is a constant matrix;
when measuring the concentration of n gases to be measured, the original voltage matrix X measured by the sensor module is used1×nSubstituting the formula (1) to obtain the gas concentration matrix Y to be measured1×n；
The coefficient matrix K and the constant matrix B are obtained by training in the following way:
selecting m proportional concentrations of each electrochemical sensor corresponding to range concentrations as standard gas concentration points to form m ^ n concentration combinations to form a measured concentration matrix
Inputting the sensor module, recording output voltage matrix of the sensor module
Will output the voltage matrix
And measuring the concentration matrix
Substituting the formula (1) into the formula (1), and converting the formula (1) by using partial minimum two-step multiplication to obtain a coefficient matrix Kn×nAnd the constant matrix B1×n。
Based on the above, the m ratios were set to 3, 20%, 50%, and 80%, respectively.
Based on the aforesaid, the sensor module is including the gas sensor who is used for detecting each component foul gas concentration and the gas sensor who is used for detecting foul smell concentration OU.
Based on the above, the multi-parameter malodorous gas concentration online monitoring system further comprises a condenser, an intelligent temperature controller, a main controller, a remote communication unit and a display; the condenser is connected to the air inlet of the sensor module through an air pump so as to condense and dehumidify the malodorous gas before detection; the main controller is electrically connected with the sensor module, the remote communication unit and the display so as to upload the corresponding concentration value of the malodorous gas detected by the sensor module to a remote server at regular time through the remote communication unit or display the concentration value on site through the display; the main controller is electrically connected with the intelligent temperature controller, and the intelligent temperature controller is electrically connected with the heating and temperature sensor arranged on the sensor module and used for adjusting the ambient temperature of the sensor module.
Based on the above, the sensor module comprises a plurality of electrochemical sensors, a sensor communication board and a confluence disc; the confluence disc comprises a base and a supporting structure; the base of the confluence disc is provided with nine-grid-shaped electrochemical sensor mounting grooves and an air passage communicated with the electrochemical sensor mounting grooves in sequence, and an air inlet and an air outlet of the air passage are provided with two sides of the base of the confluence disc; threads are arranged at one end, close to the reaction surface, of the electrochemical sensor, the electrochemical sensor is hermetically screwed in the electrochemical sensor mounting groove through a sealing ring, and the supporting structure is arranged on the base and used for supporting the electrochemical sensor; the sensor communication board is arranged above the electrochemical sensor and is electrically connected with the pins of the electrochemical sensor.
Based on the above, all install the gas circuit fast plug that is used for connecting the trachea on the air inlet of air duct and the gas outlet.
Based on the above, the sensor module is still including covering and establishing the epitheca of sensor communication board top, the epitheca sets up four-wire board line electric plug of the same kind, four-wire board line electric plug electricity is connected the sensor communication board.
Compared with the prior art, the invention has outstanding substantive characteristics and remarkable progress, and particularly, the invention solves the problem of cross interference of the sensor by using an intelligent algorithm, improves the accuracy of the detection result of the sensor and leads the measurement result of the gas concentration to be more accurate; and through improving detection portion gas circuit structure, reduce sealed point, eliminate single electrochemical sensor and maintain the problem that influences and close to electrochemical sensor, make whole detection module only have two gas circuits fast plug and an electric plug and link to each other with the outside, the module independence is stronger.
Drawings
Fig. 1 is a schematic block diagram of the present invention.
Fig. 2 is a first cross-sectional view of a sensor module according to the present invention.
Fig. 3 is a second cross-sectional view of the sensor module of the present invention.
Fig. 4 is a third cross-sectional view of the sensor module of the present invention.
Fig. 5 is a schematic block diagram of a conventional multi-parameter malodorous gas concentration online monitor.
In the figure: 1. an electrochemical sensor; 2. a sensor communication board; 3. a confluence disc; 31. a base; 32. A support structure; 311. an electrochemical sensor mounting groove; 312. an air duct; 3121. a gas path quick plug; 4. an upper shell; 41. a four-paneled wire electrical plug.
Detailed Description
The technical solution of the present invention is further described in detail by the following embodiments.
As shown in fig. 1, the present invention provides an online monitoring system for multi-parameter malodorous gas concentration, which comprises a gas sensor detection unit, a condenser, an intelligent temperature controller, a main controller, a remote communication unit and a display;
the gas sensor detection unit is a sensor module consisting of a plurality of electrochemical sensors;
the condenser is connected to an air inlet of the sensor module through an air pump so as to condense and dehumidify malodorous gas before detection;
the main controller is electrically connected with the sensor module, the remote communication unit and the display so as to upload the corresponding concentration value of the malodorous gas detected by the sensor module to a remote server at regular time through the remote communication unit or display the concentration value on site through the display;
the main controller is electrically connected with the intelligent temperature controller, and the intelligent temperature controller is electrically connected with the heating and temperature sensor arranged on the sensor module and used for adjusting the ambient temperature of the sensor module.
Specifically, as shown in fig. 2 to 4, the sensor module includes a plurality of electrochemical sensors 1, a sensor communication board 2, and a confluence plate 3; the confluence plate comprises a base 31 and a supporting structure 32; the base 31 of the confluence disc is provided with nine-grid-shaped electrochemical sensor mounting grooves 311 and air ducts 312 sequentially communicated with the electrochemical sensor mounting grooves 311, and the air inlet and the air outlet of each air duct 312 are arranged on two sides of the base 31 of the confluence disc; a thread is arranged at one end of the electrochemical sensor 1 close to the reaction surface, the electrochemical sensor 1 is hermetically screwed in the electrochemical sensor mounting groove 311 through a sealing ring, and the supporting structure 32 is arranged on the base 31 and used for supporting the electrochemical sensor 1; the sensor communication board 2 is installed above the electrochemical sensor 1 and electrically connected to the pins of the electrochemical sensor 1.
Further, air passage quick plugs 3121 for connecting an air pipe are installed on both the air inlet and the air outlet of the air passage 312. The sensor module is characterized in that the sensor module further comprises an upper shell 4 arranged above the sensor communication board in a covering mode, the upper shell 4 is provided with a four-wire-board-line electric plug 41, and the four-wire-board-line electric plug 41 is electrically connected with the sensor communication board.
The multi-parameter malodorous gas concentration on-line monitoring system provided by the invention is added with the condenser and intelligent temperature control, so that the influence of temperature and humidity on the detection result of the electrochemical sensor is reduced. The sensor module is packaged into a structure with a detection port provided with external threads, and an O-shaped sealing ring is screwed on the convergence plate base in the Jiugong format, so that the gas path sealing points of the sensor module are reduced, and the gas tightness of a gas path is further ensured; meanwhile, the maintenance of a single electrochemical sensor is not interfered by an adjacent gas circuit any more, and the measuring effect of the adjacent electrochemical sensor is not influenced. The sandwich type structure that whole sensor module adopted from bottom to top can realize with outside gas circuit and electrical connection through two way gas circuit fast plugs and four-wire plate line electric plugs all the way, makes whole gaseous testing section possess better module independence and maintainability.
The invention provides a multi-parameter malodorous gas concentration online monitoring method, which is used for a multi-parameter malodorous gas concentration online monitoring system, wherein a sensor module is preset with a relation between the measurement concentration Y of the sensor module and the output voltage value X of the sensor module:
wherein K is a coefficient matrix, and B is a constant matrix;
when measuring the concentration of n gases to be measured, the original voltage matrix X measured by the sensor module is used1×nSubstituting the formula (1) to obtain the gas concentration matrix Y to be measured1×n；
The coefficient matrix K and the constant matrix B are obtained by training in the following way:
selecting m proportional concentrations of each electrochemical sensor corresponding to range concentrations as standard gas concentration points to form m ^ n concentration combinationsMeasuring a concentration matrix
Inputting the sensor module, recording output voltage matrix of the sensor module
Will output the voltage matrix
And measuring the concentration matrix
Substituting the formula (1) into the formula (1), and converting the formula (1) by using partial minimum two-step multiplication to obtain a coefficient matrix Kn×nAnd the constant matrix B1×n。
Preferably, the m ratios are set to 3, 20%, 50% and 80%, respectively.
It should be noted that the sensor module includes a gas sensor for detecting the concentration of each component of malodorous gas and a gas sensor for detecting the concentration OU of malodorous gas, and the obtained gas concentration matrix Y to be detected1×nThe concentration of each component of the malodorous gas is also included.
For example: the method comprises the steps of selecting 4 types of to-be-detected pollutant sensors, namely t1, t2, t3 and t4, and corresponding range concentrations of k1, k2, k3 and k4, respectively selecting 20%, 50% and 80% of the corresponding range concentrations as standard gas concentration points, and sharing 3^4 ^ 81 concentration combinations. When standard gas with different measuring point concentrations is introduced, the sensor module measures different voltage values to form a matrix form;
BX81×4·K＝Y81×4
wherein, X81×4Represents the voltage value, Y, of the combination of the concentrations of the 4 gases of 81 types81×4Showing the combined values of 81 concentrations of 4 gases. Because the concentration to be measured and the voltage of the sensor module form a certain linear relation in a certain range, the partial least square method is used for the formulaConversion is performed, and linear fitting is performed based on each column of Y to obtain a constant matrix B1×4Sum coefficient matrix K4×4。
When measuring the concentration of 4 gases to be measured, the original voltage matrix X measured by the sensor module1×4Substituting the coefficient matrix K4×4Sum constant matrix B1×4To obtain an accurate concentration matrix Y1×4。
The multi-parameter malodorous gas concentration on-line monitoring method can solve the problem of cross interference of electrochemical sensors, improve the accuracy of detection results of sensor modules and enable gas concentration measurement results to be more accurate.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, it will be understood by those of ordinary skill in the art that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the invention, it is intended to cover the scope of the claims.
Claims (7)
1. A multi-parameter malodorous gas concentration on-line monitoring method is used for a multi-parameter malodorous gas concentration on-line monitoring system, and is characterized in that:
the multi-parameter on-line monitoring system for the concentration of the malodorous gas comprises a gas sensor detection unit, wherein the gas sensor detection unit is a sensor module consisting of a plurality of electrochemical sensors;
the sensor module presets the relation between the measurement concentration Y of the sensor module and the output voltage value X of the sensor module:
wherein K is a coefficient matrix, and B is a constant matrix;
when measuring the concentration of n kinds of gases to be measured, the sensor module is used for measuringThe obtained original voltage matrix X1×nSubstituting the formula (1) to obtain the gas concentration matrix Y to be measured1×n；
The coefficient matrix K and the constant matrix B are obtained by training in the following way:
selecting m proportional concentrations of each electrochemical sensor corresponding to range concentrations as standard gas concentration points to form m ^ n concentration combinations to form a measured concentration matrix
Inputting the sensor module, recording the output voltage matrix of the sensor module
Will output the voltage matrix
And measuring the concentration matrix
Substituting the formula (1) into the formula (1), and converting the formula (1) by using a partial least square method to obtain a coefficient matrix Kn×nAnd the constant matrix B1×n。
2. The online multiparameter malodorous gas concentration monitoring method according to claim 1, wherein: the m ratios were set to 3, 20%, 50% and 80%, respectively.
3. The online multiparameter malodorous gas concentration monitoring method according to claim 1, wherein: the sensor module is including being used for detecting the gas sensor of each component foul gas concentration and being used for detecting the gas sensor of foul gas concentration OU.
4. The online multiparameter malodorous gas concentration monitoring method according to claim 1, wherein: the multi-parameter malodorous gas concentration online monitoring system also comprises a condenser, an intelligent temperature controller, a main controller, a remote communication unit and a display;
the condenser is connected to an air inlet of the sensor module through an air pump so as to condense and dehumidify malodorous gas before detection;
the main controller is electrically connected with the sensor module, the remote communication unit and the display so as to upload the corresponding concentration value of the malodorous gas detected by the sensor module to a remote server at regular time through the remote communication unit or display the concentration value on site through the display;
the main controller is electrically connected with the intelligent temperature controller, and the intelligent temperature controller is electrically connected with the heating and temperature sensor arranged on the sensor module and used for adjusting the ambient temperature of the sensor module.
5. The multiparameter malodorous gas concentration online monitoring method according to claim 4, wherein: the sensor module comprises a plurality of electrochemical sensors, a sensor communication board and a confluence disc;
the confluence disc comprises a base and a supporting structure;
the base of the confluence disc is provided with nine-grid-shaped electrochemical sensor mounting grooves and an air duct communicated with the electrochemical sensor mounting grooves in sequence, and an air inlet and an air outlet of the air duct are provided with two sides of the base of the confluence disc;
the electrochemical sensor is arranged in the electrochemical sensor mounting groove in a sealing and screwing mode through a sealing ring, and the supporting structure is arranged on the base and used for supporting the electrochemical sensor;
the sensor communication board is arranged above the electrochemical sensor and is electrically connected with the pins of the electrochemical sensor.
6. The multiparameter malodorous gas concentration online monitoring method according to claim 5, wherein: and air passage quick plugs for connecting air pipes are arranged on the air inlet and the air outlet of the air passage.
7. The multiparameter malodorous gas concentration online monitoring method according to claim 5 or 6, wherein: the sensor module is characterized in that the sensor module further comprises an upper shell arranged above the sensor communication board in a covering mode, wherein the upper shell is provided with a four-wire-board-line electric plug, and the four-wire-board-line electric plug is electrically connected with the sensor communication board.
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