CN106092898B - Redundant online photoion analysis system and analysis method thereof - Google Patents
Redundant online photoion analysis system and analysis method thereof Download PDFInfo
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- CN106092898B CN106092898B CN201610633380.1A CN201610633380A CN106092898B CN 106092898 B CN106092898 B CN 106092898B CN 201610633380 A CN201610633380 A CN 201610633380A CN 106092898 B CN106092898 B CN 106092898B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/15—Preventing contamination of the components of the optical system or obstruction of the light path
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/15—Preventing contamination of the components of the optical system or obstruction of the light path
- G01N2021/151—Gas blown
Abstract
The invention relates to a redundant online photoion analysis system and an analysis method thereof, wherein the redundant online photoion analysis system is provided with at least one cleaning assembly and at least two monitoring passages, and each monitoring passage comprises a first valve assembly and a photoion gas detector; the first valve assembly is provided with a first valve port, a second valve port and a third valve port, the first valve port of the first valve assembly is connected with the gas to be detected, the second valve port of the first valve assembly is connected with the cleaning assembly, the third valve port of the first valve assembly is connected with the photo-ionized gas detector, the first valve port and the third valve port of the first valve assembly are communicated when the discharged gas to be detected is monitored, and the second valve port and the third valve port of the first valve assembly are communicated when the photo-ionized gas detector is cleaned. By implementing the redundant online photoion analysis system and the analysis method thereof, the photoion gas detectors on different monitoring paths can work alternately, and the photoion gas detectors can be cleaned conveniently.
Description
Technical Field
The invention relates to a gas monitoring device and a monitoring method, in particular to a redundant online photoion analysis system and an analysis method thereof.
Background
The existing photoion gas detector of the redundant online photoion analysis system is easily influenced by impurities in the gas to be detected in the detection process, so that the sensitivity of the photoion gas detector is reduced, and the detection accuracy is influenced. Therefore, after the photoionization gas detector is used for a period of time, the photoionization gas detector needs to be cleaned periodically. However, when there are some field environments requiring uninterrupted real-time monitoring of the emissions of VOCs, the existing photoionization gas detectors are difficult to meet the detection requirements.
Disclosure of Invention
In order to solve the existing problems, the invention provides a redundant online photoion analysis system and an analysis method thereof.
The invention provides a redundant online photoion analysis system, which is provided with at least one cleaning component and at least two monitoring channels, wherein each monitoring channel comprises a first valve component and a photoion gas detector;
the first valve assembly is provided with a first valve port, a second valve port and a third valve port, the first valve port of the first valve assembly is connected with a gas to be detected, the second valve port of the first valve assembly is connected with the cleaning assembly, and the third valve port of the first valve assembly is connected with the light ion gas detector; when the discharged gas to be detected is monitored, the first valve port of the first valve assembly is communicated with the third valve port, and when the photoion gas detector is cleaned, the second valve port of the first valve assembly is communicated with the third valve port.
In one embodiment, the cleaning assembly comprises a gas source and a cleaning gas pipeline, wherein the gas source is communicated with the cleaning gas pipeline; and a filtering device is arranged in the clean gas pipeline and is used for filtering the gas source into clean gas.
In one embodiment, the gas source is an in situ gas. In one embodiment, the redundant online photoionization analysis system further comprises a control unit, wherein the control unit is connected with the first valve assembly in each monitoring passage and controls the connection and disconnection between the valve ports of the first valve assembly.
In an embodiment, the redundant online photoionization analysis system further includes an air pump, and each monitoring path is provided with an air pump, or a plurality of monitoring paths are connected to the same air pump.
In one embodiment, the redundant online photoion analysis system is provided with a mounting plate, and a detector module, a valve module and an air pump module which are independent from each other are integrated on the mounting plate;
all the photoion gas detectors are integrated in the detector module, all the first valve assemblies are integrated in the valve assembly module, and all the air pumps are integrated in the air pump module.
In one embodiment, the detector module and the air pump module are arranged in parallel, and the detector module and the air pump module form a whole and are arranged in parallel with the valve module.
In one embodiment, the detector module includes two photoionization gas detectors arranged in parallel, and a circuit board arranged between the two photoionization gas detectors; the circuit board is respectively and electrically connected with the two photoion gas detectors.
In one embodiment, the redundant online photoionization analysis system further includes a second valve assembly, the second valve assembly also includes a first valve port, a second valve port and a third valve port, the first valve port of the second valve assembly is connected to the straight gas extraction port, the second valve port of the second valve assembly is connected to the dilution gas channel port, and the third valve port of the second valve assembly is connected to the first valve port of the first valve assembly.
In one embodiment, the dilution air channel interface is connected with a dilution sampling probe, and the dilution sampling probe is connected with an exhaust pipeline of the gas to be detected.
In one embodiment, the dilution sampling probe comprises a sonic orifice and a vacuum generator connected with the sonic orifice, the sonic orifice is connected with an exhaust pipeline, and the vacuum generator is further connected with a dilution air passage interface.
In one embodiment, the vacuum generator is further connected with a compressed air source.
The invention also provides a redundant online photoion analysis method, which adopts the redundant online photoion analysis system and comprises the following steps:
obtaining a cleaning gas through the cleaning assembly;
selecting a monitoring passage with a photoionization gas detector to be cleaned, connecting the second valve port and the third valve port of the first valve assembly in the selected monitoring passage, and connecting the first valve port and the third valve port of the first valve assembly in the unselected monitoring passage;
introducing the cleaning gas into a selected monitoring channel, and cleaning a photoion gas detector in the selected monitoring channel;
and introducing the gas to be detected into the unselected monitoring passage, and detecting the gas to be detected through the photoion gas detector in the unselected monitoring passage.
In one embodiment, the step of obtaining the cleaning gas through the purge assembly comprises:
and filtering the gas source through a filtering device in the cleaning assembly to obtain the clean gas.
In one embodiment, the gas source is an in situ gas.
The redundant online photoion analysis system is provided with at least one cleaning component and at least two monitoring passages, wherein the cleaning component can filter and clean field gas to obtain clean gas, so that the clean gas can be accessed into one monitoring passage for automatically decomposing, blowing and cleaning pollutants in a photoion gas sensor when a photoion gas detector on one monitoring passage needs to be cleaned, the measurement precision of the instrument is ensured, and the service life of the sensor is prolonged; and the other monitoring passage is controlled to be accessed into the gas to be detected, so that the photoion gas detectors in the monitoring passages normally work, that is, the photoion gas detectors in the multiple monitoring passages alternately work, and the redundant online photoion analysis system can be ensured to uninterruptedly monitor the discharge of VOCs in real time.
Drawings
FIG. 1 is a schematic diagram illustrating the structure of a redundant online photoionization analysis system according to one embodiment of the invention;
FIG. 2 is a schematic diagram showing a specific structure of a redundant online photoion analysis system according to an embodiment of the present invention, which includes a housing, a monitoring channel disposed in the housing, and a control unit;
fig. 3 is a schematic view showing a detailed structure of the monitoring path and its installation structure of fig. 2;
FIG. 4 is a schematic diagram showing a detailed structure of the redundant online photoion analysis system of FIG. 2 with the housing removed;
fig. 5 is a schematic diagram showing the structure of a redundant online photoionization analysis system according to another embodiment of the invention.
Detailed Description
The invention is further described with reference to the drawings and the specific operating examples.
The present invention relates to a redundant online photoion analysis system, as shown in fig. 1 to 5, having at least one cleaning assembly (not shown) and at least two monitoring paths, each of which includes a first valve assembly 11 and a photoion gas detector 21. The first valve assembly 11 has a first port, a second port, and a third port; a first valve port of the first valve assembly 11 is connected with a gas to be detected, a second valve port of the first valve assembly 11 is connected with the cleaning assembly, and a third valve port of the first valve assembly 11 is connected with the light ion gas detector 21; for switching on the first and third ports of the first valve assembly 11 when monitoring the discharged gas to be detected, and for switching on the second and third ports of the first valve assembly 11 when cleaning the photo-ionic gas detector 21.
The cleaning assembly comprises an air source and a cleaning air pipeline, and the air source is communicated with the cleaning air pipeline; the clean gas pipeline is internally provided with a filtering device used for filtering a gas source into clean gas. The gas source is preferably a field gas.
The redundant online photoion analysis system is provided with at least one cleaning component and at least two monitoring passages, wherein the cleaning component can filter and clean field gas to obtain clean gas, so that the clean gas can be accessed into one monitoring passage for automatically decomposing, blowing and cleaning pollutants in a photoion gas sensor when a photoion gas detector 21 on one monitoring passage needs to be cleaned, the measurement precision of the instrument is ensured, and the service life of the sensor is prolonged; and controlling the other monitoring channel to access the gas to be detected so that the photoion gas detectors 21 in the monitoring channel work normally, namely, the alternative work among the photoion gas detectors 21 in the multiple monitoring channels is realized, and the emission of VOCs (volatile organic chemicals) can be monitored in real time uninterruptedly by the redundant online photoion analysis system.
Fig. 1 is a schematic structural diagram of a redundant online photoionization analysis system according to an embodiment. In the following embodiments, the case where two monitoring paths are provided is described, but the number of the monitoring paths may be plural, and is not particularly limited herein.
The redundant online photoionization analysis system of the embodiment has two monitoring paths, each monitoring path comprises a first valve component 11, a photoionization gas detector 21 and an air pump 31 which are connected in sequence through a pipeline, and each first valve component 11 has a first valve port, a second valve port and a third valve port; the first valve port of the first valve assembly 11 is connected to the gas to be detected, the second valve port of the first valve assembly 11 is connected to the cleaning assembly, and the third valve port of the first valve assembly 11 is connected to the photo-ionic gas detector 21.
The first valve assembly 11 and the second valve assembly 13 described below are preferably three-way valves.
It is understood that, for the air pump 31, there may be one air pump 31 on each monitoring path, or multiple monitoring paths connected to the same air pump 31, and this is not limited in particular.
The redundant online photoionization analysis system further includes a control unit 40 (shown in fig. 4 with reference to fig. 2), wherein the control unit 40 is connected to the first valve assembly 11 in each monitoring channel, and controls the connection and disconnection between the respective valve ports of the first valve assembly 11.
As shown in fig. 2, the redundant online photo-ion analysis system has a housing 50, a monitoring channel disposed in the housing 50, and a control unit 40.
The housing is provided with a cylindrical accommodating part 51, and an electrical interface 511 and a gas interface 512 which are arranged on the circumference of the cylindrical accommodating part 51, wherein the electrical interface 511 is used for electrically connecting a power supply with the control unit 40 and the monitoring passage to supply power for the control unit and the monitoring passage, and the gas interface 512 is connected with the monitoring passage to supply gas to be detected and clean gas for the monitoring passage.
The cylindrical housing part 51 is further provided with a display input port 513 on the circumference, and the display input port 513 is connected with the control unit 40 and is used for inputting the on-off operation of each valve port of the first valve assembly 11 and displaying the working state of the monitoring passage. The specific display input port 513 has a first display input port for inputting a control operation of the first valve assembly 11 in a monitoring path and specifically displaying whether the photoionized gas detector 21 is in a normal operation state or a purge state in the monitoring path; similarly, the second display input port is used for inputting control operation of the first valve assembly 11 in another monitoring path and for displaying whether the photoion detector is in a normal operation state or a cleaning state in the other monitoring path. Since the display input port 513 is provided in the circumferential direction of the cylindrical housing portion 51, it is more convenient for the operator to operate and observe the operation of the monitoring passage.
As shown in fig. 2 and 3, the redundant online photoionization analysis system includes a mounting plate 61 and a fixing plate 62, the fixing plate 62 is connected and fixed to one end of the cylindrical housing 51, the mounting plate 61 is stacked on the fixing plate 62 and fixedly connected to the fixing plate 62, the mounting plate 61 is integrated with a monitoring path,
specifically, a support 63 is further provided between the mounting plate 61 and the fixing plate 62, the support 63 includes a plate portion 631, a support portion 632 extending from an edge of the plate portion 631 toward one surface of the plate body, and a connection portion 633 extending from an edge of one end of the support portion 632 away from the plate portion 631, the connection portion 633 also being substantially in a plate shape and substantially parallel to the plate portion 631.
The edges of the mounting plate 61 and the plate body portion 631 of the fixing plate 62 are correspondingly provided with mounting holes. Guide posts extend in a direction substantially perpendicular to the fixed plate 62 at positions corresponding to the mounting holes on the fixed plate 62. The plate portion 631 abuts against the mounting plate 61, the supporting portion 632 abuts against the fixing plate 62, one end of the guide post is fixedly connected with the fixing plate 62 through a screw, and the other end of the guide post sequentially penetrates through the plate portion 631 and the mounting hole at the edge of the mounting plate 61 and is locked through the screw. Due to the abutting action of the supporting body 63, the predetermined gap between the mounting plate 61 and the fixing plate 62 can be maintained, the fixed connection between the mounting plate 61 and the fixing plate 62 can be ensured, and the size of the gap between the mounting plate 61 and the fixing plate 62 can be adjusted by adjusting the height of the supporting portion 632 of the supporting body 63.
With continued reference to FIG. 3, the mounting plate 61 has integrated thereon the monitor module 20, the valve assembly module 10, and the air pump module 30. It should be noted that the detector module 20 includes not only the photo-ionic gas detector 21 but also various accessories associated with the installation and operation of the photo-ionic gas detector 21, and the same applies to the valve module 10 and the air pump module 30, the valve module 10 includes not only the first valve assembly 11 but also various accessories associated with the installation and operation of the first valve assembly 11, and the air pump module 30 includes not only the air pump 31 but also various accessories associated with the installation and operation of the air pump 31.
It should be noted that the photoionization gas detectors 21 in all monitoring paths are integrated in the detector module 20, the first valve components 11 in all monitoring paths are integrated in the valve component module 10, the air pumps 31 in all monitoring paths are integrated in the air pump module 30, and the detector module 20, the valve component module 10, and the air pump module 30 are all independently disposed and connected to each other through pipes. Specifically, the detector module 20 and the air pump module 30 are arranged in parallel, and the whole formed by the detector module 20 and the air pump module 30 is arranged in parallel with the valve module 10.
By independently arranging the modules and integrating corresponding devices in all the measuring channels by each module, the compactness of the whole redundant online photoion analysis system can be enhanced, and the volume of the redundant online photoion analysis system is reduced.
Hereinafter, a specific structure of each module will be described.
Referring to fig. 3, the detector module 20 includes a base 22 fixedly connected to the mounting plate 61, two photo-ion gas detectors 21 disposed on the base 22, and a circuit board 23 disposed between the two photo-ion gas detectors 21, wherein the circuit board 23 is electrically connected to the two photo-ion gas detectors 21, respectively.
The detector module 20 further includes a temperature sensor 24, and each photo-ion gas detector 21 is connected to one of the temperature sensors 24. The two photoionization gas detectors 21 are arranged in parallel, and the two temperature sensors 24 are provided at different ends of the two photoionization gas detectors 21. Through connecting temperature sensor 24 in the different ends of two light ion gas detector 21, can guarantee to stagger the setting at the pipeline that every temperature sensor 24 is connected for the pipeline is arranged more rationally.
Further, the interfaces of the photoionization gas detector 21 and the temperature sensor 24 to which the pipes are connected are provided on the surfaces of the photoionization gas detector 21 and the temperature sensor 24 which are away from the base 22. The base 22 may optionally be covered with a casing 25 (see fig. 4), and the optical ion gas detector 21, the temperature sensor 24 and the circuit board 23 are all accommodated inside the casing 25.
The air pump module 30 includes two air pumps 31 arranged in parallel, the two air pumps 31 are both fixedly arranged on the fixing plate 62, and the interfaces of the air pumps 31 connected with the pipes are arranged on the surface of the air pump 31 opposite to the mounting plate 61.
Meanwhile, it should be noted that the arrangement direction of the two air pumps 31 is substantially the same as the arrangement direction of the two photo-ion gas detectors 21.
The valve assembly module 10 includes two first valve assemblies 11 arranged in parallel, a pipe receiving cavity 12 parallel to the arrangement direction of the first valve assemblies 11, a valve assembly body of the first valve assemblies 11, and three valve ports arranged on one side of the valve assembly body. The arrangement direction of the first valve assembly 11 is perpendicular to the arrangement direction of the photo-ion detector.
The pipe accommodating chamber 12 is box-shaped and is formed by enclosing a plurality of planes. Such as a first surface 121 disposed substantially perpendicular to the mounting plate 61, along the direction of the array of the first valve assemblies 11, and disposed away from the first valve assemblies 11, a second surface 122 and a third surface 123 connected to the first surface 121 and disposed substantially perpendicular to the mounting plate 61, and a fourth surface 124 connected to each of the first surface 121, the second surface 122, and the third surface 123 and disposed parallel to the mounting plate 61, the second surface 122 being disposed adjacent to the detector module 20, and the third surface 123 being disposed adjacent to the air pump module 30.
The three ports of each first valve assembly 11 are connected to the fourth surface 124 of the pipe receiving cavity 12.
The first surface 121 is provided with two detector interfaces 1212, and the third ports of all the first valve assemblies 11 extend to the first surface 121 of the pipeline accommodating cavity 12 through the pipeline accommodated in the pipeline accommodating cavity 12 and are connected with the detector interfaces 1212 in a one-to-one correspondence manner; the second surface 122 is provided with a clean gas port 1221 and a to-be-detected gas port 1222, the first valve ports of all the first valve components 11 extend to the second surface 122 of the pipeline receiving cavity 12 through the pipeline received in the pipeline receiving cavity 12 to be connected with the to-be-detected gas port 1222, and the second valve ports of all the first valve components 11 extend to the second surface 122 of the receiving cavity through the pipeline received in the pipeline receiving cavity 12 to be connected with the clean gas port 1221. By extending different valve ports to different surfaces of the pipeline accommodating cavity 12 and connecting with corresponding interfaces, an operator can quickly distinguish whether the connecting mode of the pipeline is correct or not.
As shown in fig. 4, the control unit 40 has a control plate 41, and a support member 42 extending from one side of the control plate 41 at a predetermined angle, for example, vertically, the support member 42 having one end fixedly connected to the control plate 41 and the other end fixedly connected to the mounting plate 61. The control board 41 is substantially parallel to the mounting plate 61, and each device included in the monitoring path is provided between the control board 41 and the mounting plate 61.
Fig. 5 is a schematic diagram of a redundant online photoion analysis system according to another embodiment of the present invention.
The principle of the structure of this embodiment is substantially the same as that of the above embodiment, except that in this embodiment, the redundant online photoionization analysis system may further include a second valve assembly 13, where the second valve assembly 13 also includes a first valve port, a second valve port, and a third valve port, the first valve port of the second valve assembly 13 is connected to the straight gas extraction channel interface 1231, the second valve port of the second valve assembly 13 is connected to the dilution gas channel interface 1232, and the third valve port is connected to the first valve port of the first valve assembly 11. The straight gas extraction duct interface 1231 is connected with a straight gas extraction duct to be directly used for extracting gas, the dilution gas duct interface 1232 is connected with a dilution gas duct to be used for diluting gas, and the straight gas extraction duct and the dilution gas duct are both connected with an exhaust duct of gas to be detected.
The control unit 40 is also connected to the second valve assembly 13 to control the connection and disconnection between the ports of the second valve assembly 13.
In this embodiment, when the directly pumped gas needs to be accessed, the first valve port and the third valve port of the second valve assembly 13 are connected; when the dilution gas is required to be accessed, the second valve port and the third valve port of the second valve assembly 13 are accessed, so that different gas passages can be selected according to the concentration of the gas to be detected. Specifically, when the gas to be detected has a low concentration, the gas to be detected directly enters the photoion gas detector 21 through the straight gas extraction channel; when the gas to be detected has high concentration, the gas to be detected directly enters the photoion gas detector 21 through the dilution air passage; by the operation, the redundant online photoion analysis system can be ensured to realize full concentration coverage monitoring of high and low concentrations.
It should be noted that the straight gas extraction port 1231 is connected to a first filter 70, and the first filter 70 is directly connected to an exhaust pipeline of the gas to be detected; the dilution air channel interface 1232 is connected to a dilution sampling probe 80, and the dilution sampling probe 80 is directly connected to an exhaust pipeline of the gas to be detected.
Specifically, for dilution sampling probe 80, which includes a second filter 81 connected to the exhaust line, a sonic orifice 82 connected to second filter 81, and a vacuum generator 83 connected to sonic orifice 82, vacuum generator 83 is connected to dilution airway interface 1232. Further, the vacuum generator 83 is connected to a compressed air source 84. Here, the sonic orifice 82 communicates with the exhaust conduit.
The filter cores of the first filter 70 and the second filter 81 can be made of stainless steel, ceramic or glass fiber, and are manufactured by sintering or powder metallurgy, and the filter pore size of the filter core can reach 3-5 micrometers.
The sonic orifice 82 acts as a constant flow, and the required stable flow rate can be controlled by selecting the aperture size of the sonic orifice 82. The principle of the sonic orifice 82 is that when the length of the orifice is much smaller than the aperture, and when the pressure at the two ends of the orifice reaches more than 0.46 times, the speed of the gas flowing through the orifice is independent of the pressure change at the two ends of the orifice, and only depends on the vibration speed of the gas molecules flowing through the orifice, namely, a constant flow is generated.
The vacuum generator 83 operates on the principle of jetting compressed air at high speed through a nozzle to form a jet at the nozzle outlet to create a entrainment flow. Under the action of entrainment, the air around the outlet of the spray pipe is continuously sucked away, so that the pressure in the adsorption cavity is reduced to be lower than the atmospheric pressure, and a certain vacuum degree is formed.
The compressed gas source 84 may be in-situ pipeline instrument wind or bottle gas.
In this embodiment, the dilution sampling probe 80 adopts structures such as the vacuum generator 83 and the compressed air source 84, and can dilute the gas to be detected, so that the concentration of the gas to be detected entering the photoion gas detector 21 is within the measurement range. Meanwhile, the dilution sampling probe 80 also has the functions of filtration, back flushing, constant temperature and the like, and can basically achieve the maintenance-free effect.
Referring to fig. 3, the specific structure of the redundant online photoionization analysis system according to this embodiment of the present invention is substantially the same as that of the above-described embodiment, except that the valve module 10 has a different structure.
Specifically, referring to fig. 3, the valve module 10 further includes a second valve assembly 13, and the second valve assembly 13 is disposed in parallel with the first valve assembly 11. In this embodiment, a dilution air channel interface 1232 and a straight pumping channel interface 1231 are further disposed on the third surface 123 of the tube receiving cavity 12, a to-be-detected gas adapter 1211 is further disposed on the first surface 121, the straight pumping channel interface 1231 is connected to the first valve port of the second valve assembly 13 through a tube in the tube receiving cavity 12, the dilution air channel interface 1232 is connected to the second valve port of the second valve assembly 13 through a tube in the tube receiving cavity 12, the third valve port of the second valve assembly 13 extends to the second surface 122 through a tube in the tube receiving cavity 12 and is connected to the to-be-detected gas adapter 1211, and further is connected to the to-be-detected gas interface 1222 on the second surface 122 through the to-be-detected gas adapter 1211 disposed on the first surface 121.
Other structures of the redundant online photoion analysis system in this embodiment are the same as those in the above embodiment, and are not described herein again. And the structure of the dilution sampling probe 80 is not shown in a specific structural view.
The invention also provides a redundant online photoion analysis method, which adopts the redundant online photoion analysis system in the two embodiments, and comprises the following steps:
obtaining a cleaning gas through the cleaning assembly;
selecting a monitoring passage with the photoionization gas detector 21 to be cleaned, and connecting the second valve port and the third valve port of the first valve assembly 11 in the selected monitoring passage, and connecting the first valve port and the third valve port of the first valve assembly 11 in the unselected monitoring passage;
introducing the cleaning gas into the selected monitoring passage, and cleaning the photoion gas detector 21 in the selected monitoring passage;
and introducing the gas to be detected into the unselected monitoring passage, and detecting the gas to be detected through the photoionization gas detector 21 in the unselected monitoring passage.
Wherein the step of obtaining the cleaning gas through the purge assembly comprises:
and filtering the gas source through a filtering device in the cleaning assembly to obtain the clean gas.
Preferably, the gas source is an in situ gas.
The steps of selecting a monitoring channel having the photo-ionic gas detector 21 to be cleaned, connecting the second port and the third port of the first valve assembly 11 in the selected monitoring channel, and connecting the first port and the third port of the first valve assembly 11 in the unselected monitoring channel are achieved by controlling the connection and disconnection of the ports of the first valve assembly 11 through the control unit 40.
Since the redundant online photoionization analysis system in the above two embodiments is adopted in the redundant online photoionization analysis method, the structure and function of the redundant online photoionization analysis system are not described in detail in this embodiment.
In summary, in the present invention, the cleaning gas generated by the cleaning component is introduced into the selected monitoring channel, and the photoion gas detector 21 in the selected monitoring channel is cleaned; gas to be detected is introduced into the unselected monitoring passage, the gas to be detected is detected through the photoion gas detector 21 in the unselected monitoring passage, and clean gas can be introduced into the selected monitoring passage for automatically decomposing, blowing and cleaning pollutants in the photoion gas sensor, so that the measurement precision of the instrument is ensured, and the service life of the sensor is prolonged; and the unselected monitoring channels are controlled to be accessed into the gas to be detected, so that the photoion gas detectors 21 in the monitoring channels work normally, that is, the photoion gas detectors 21 in the multiple monitoring channels work alternately, and the redundant online photoion analysis system can be ensured to monitor the discharge of VOCs continuously in real time.
The embodiments of the present invention have been described in detail, but the present invention is not limited to the above-described embodiments, which are only examples. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, equivalent changes and modifications made without departing from the spirit and scope of the present invention should be covered by the present invention.
Claims (10)
1. A redundant on-line photoion analysis system having a housing (50), at least one cleaning assembly and at least two monitoring paths disposed within said housing (50), each of said monitoring paths comprising a first valve assembly (11), and a photoion gas detector (21);
the first valve component (11) is provided with a first valve port, a second valve port and a third valve port, the first valve port of the first valve component (11) is connected with a gas to be detected, the second valve port of the first valve component (11) is connected with the cleaning component, and the third valve port of the first valve component (11) is connected with the photo-ion gas detector (21);
the first valve port and the third valve port of the first valve assembly (11) are communicated when the discharged gas to be detected is monitored, and the second valve port and the third valve port of the first valve assembly (11) are communicated when the photoionized gas detector (21) is cleaned;
the redundant online photoion analysis system comprises a valve component module (10), wherein the first valve components (11) in all monitoring channels are integrated in the valve component module (10), a pipeline accommodating cavity (12) parallel to the arrangement direction of the first valve components (11) is further integrated in the valve component module (10), the pipeline accommodating cavity (12) is formed by enclosing a plurality of planes, different valve ports of each first valve component (11) extend to different surfaces of the pipeline accommodating cavity (12), and the same valve ports of the first valve components (11) extend to the same surface of the pipeline accommodating cavity (12);
the redundant online photoion analysis system further comprises a fixing plate (62), a mounting plate (61) stacked on the fixing plate (62), and a control plate (41), wherein a supporting body (63) abutted against the mounting plate (61) is arranged between the mounting plate (61) and the fixing plate (62), the first valve assembly (11) and the photoion gas detector (21) are arranged between the control plate (41) and the mounting plate (61), the control plate (41) is arranged in the shell (50), and a gap is formed between the circumferential surface of the control plate (41) and the inner wall of the shell (50);
still integrated air pump module (30) on mounting panel (61), and include detector module (20) of gaseous detector (21) of light ion, detector module (20) with air pump module (30) set up side by side, detector module (20) with the whole that air pump module (30) formed jointly with valve module (10) set up side by side.
2. The redundant online photoion analysis system of claim 1, wherein the purge assembly comprises a gas source and a clean gas conduit, the gas source in communication with the clean gas conduit;
and a filtering device is arranged in the clean gas pipeline and is used for filtering the gas source into clean gas.
3. The redundant online photoion analysis system of claim 2, wherein the gas source is a field gas.
4. A redundant on-line photoion analysis system according to claim 1, wherein the air pump module (30) comprises an air pump (31), one air pump (31) is provided on each monitoring channel, or a plurality of monitoring channels are connected to the same air pump (31).
5. A redundant online photo-ion analysis system according to claim 1, further comprising a control unit (40), wherein the control unit (40) is connected with the first valve assembly (11) in each monitoring channel, and controls the connection and disconnection between the respective valve ports of the first valve assembly (11).
6. A redundant on-line photoion analysis system according to any of claims 1-5, further comprising a second valve assembly (13), wherein the second valve assembly (13) also comprises a first port, a second port and a third port, wherein the first port of the second valve assembly (13) is connected to the straight gas extraction port interface (1231), the second port of the second valve assembly (13) is connected to the dilution gas channel interface (1232), and the third port of the second valve assembly (13) is connected to the first port of the first valve assembly (11).
7. The redundant online photoion analysis system of claim 6, wherein the dilution airway interface (1232) is connected with a dilution sampling probe (80), and the dilution sampling probe (80) is connected with an exhaust pipeline of a gas to be detected.
8. A redundant online photoion analysis method, which employs the redundant online photoion analysis system of any one of claims 1 to 7, comprising the steps of:
obtaining a cleaning gas through the cleaning assembly;
selecting a monitoring passage with a photoionization gas detector (21) needing to be cleaned, and connecting the second valve port and the third valve port of the first valve assembly (11) in the selected monitoring passage, and connecting the first valve port and the third valve port of the first valve assembly (11) in the unselected monitoring passage;
introducing the cleaning gas into a selected monitoring channel, and cleaning a photoion gas detector (21) in the selected monitoring channel;
and introducing gas to be detected into the unselected monitoring passage, and detecting the gas to be detected through a photoion gas detector (21) in the unselected monitoring passage.
9. The redundant online photoion analysis method of claim 8, wherein said step of obtaining a cleaning gas through a cleaning assembly comprises:
and filtering the gas source through a filtering device in the cleaning assembly to obtain the clean gas.
10. A redundant online photoion analysis method as recited in claim 9, wherein the gas source is an in situ gas.
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