CN113960250A - Mixed gas detection system and method for shield tunnel - Google Patents
Mixed gas detection system and method for shield tunnel Download PDFInfo
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- 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
- G01N33/0032—General constructional details of gas analysers, e.g. portable test equipment concerning the detector comprising two or more sensors, e.g. a sensor array using two or more different physical functioning modes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0062—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method or the display, e.g. intermittent measurement or digital display
- G01N33/0063—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method or the display, e.g. intermittent measurement or digital display using a threshold to release an alarm or displaying means
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Abstract
The invention discloses a mixed gas detection system and a method for a shield tunnel, which comprises the following steps: the device comprises a mixed gas detection module, a processing module and an alarm module; the mixed gas detection module comprises an environment gas detection module, a combustible gas detection module and a toxic gas detection module, and a gas separation membrane is arranged between the environment gas detection module and the combustible gas detection module; the environment gas detection module receives the detected mixed gas and detects the concentration of oxygen and carbon dioxide in the mixed gas; the combustible gas detection module detects the concentration of the combustible gas separated by the gas separation membrane; the toxic gas detection module detects the concentration of toxic gas in the residual gas; the processing module corrects the gas concentration based on the compensation model and judges whether the gas concentration exceeds the limit or not according to the corrected gas concentration; the compensation model is obtained by training measured values and standard values of different gas mixtures based on known concentration; the alarm module is used for alarming in an overrun mode. Eight kinds of gas monitoring are realized, and overrun alarming and information linkage are realized through wireless data transmission.
Description
Technical Field
The invention relates to the technical field of environmental geology, in particular to a mixed gas detection system and method for a shield tunnel.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
At present, during the construction process of a shield tunnel, when environmental gas is monitored, most of gas monitoring equipment can only monitor single-type gas and apply a wired information transmission technology, so that the equipment arrangement in a narrow working space of the shield machine is complicated, linkage cannot be formed between different gas information, mutual relation between different gas types and concentrations cannot be comprehensively researched, the utilization rate of the gas information is low, and the due perception early warning effect in the construction process of the shield tunnel cannot be achieved.
Disclosure of Invention
In order to solve the problems, the invention provides a mixed gas detection system and a mixed gas detection method for a shield tunnel, which realize real-time monitoring of eight gases in a shield tunnel environment and realize overrun alarm and information linkage through wireless data transmission in the shield tunnel environment.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a mixed gas detection system for a shield tunnel, including: the device comprises a mixed gas detection module, a processing module and an alarm module; the mixed gas detection module comprises an environment gas detection module, a combustible gas detection module and a toxic gas detection module which are sequentially connected, and a gas separation membrane is arranged between the environment gas detection module and the combustible gas detection module;
the environment gas detection module is used for receiving the detected mixed gas and detecting the concentrations of oxygen and carbon dioxide in the mixed gas; the combustible gas detection module is used for detecting the concentration of the combustible gas separated by the gas separation membrane; the toxic gas detection module is used for detecting the concentration of toxic gas in the residual gas;
the processing module receives gas concentrations of different gases, is configured to correct the gas concentrations based on a trained compensation model, and judges whether the gas concentrations exceed limits according to the corrected gas concentrations; the compensation model is obtained by training a measured value and a standard value after different gases with known concentrations are mixed;
the alarm module is used for alarming in an overrun mode.
As an alternative embodiment, before the toxic gas detection module detects the concentration of the toxic gas in the residual gas, a specific catalyst is used to perform a secondary separation on the residual gas to separate out various types of toxic gas.
As an alternative embodiment, the process of secondary separation of the residual gas by using a specific catalyst is as follows: catalyzing sulfur dioxide by adopting vanadium pentoxide; catalyzing nitrogen dioxide by adopting titanium dioxide; catalyzing hydrogen sulfide by adopting a magnesium-aluminum composite oxide; catalyzing carbon monoxide by adopting a mixed preparation of aluminum oxide and palladium; the ammonia gas is catalyzed by chromium oxide.
In an alternative embodiment, in the environmental gas detection module, an oxygen sensor is used for detecting the oxygen concentration based on an electrochemical principle, and a carbon dioxide sensor is used for obtaining the carbon dioxide concentration based on a non-dispersive infrared principle.
In an alternative embodiment, the combustible gas detection module adopts a combustible gas sensor to obtain the concentration of the combustible gas based on the principle of catalytic combustion.
As an alternative embodiment, the toxic gas detection module uses a toxic gas sensor to obtain the concentration of toxic gases based on electrochemical principles, and the toxic gases include sulfur dioxide, nitrogen dioxide, hydrogen sulfide, carbon monoxide and ammonia.
As an alternative embodiment, the gas separation membrane is a gas separation membrane made of propyl vinyl sulfoxide modified polyvinyl alcohol, and combustible gas is separated based on sulfur-phobic and hydrogen-philic characteristics.
In an alternative embodiment, in the processing module, the gas concentration is corrected by adopting a neighbor classification data algorithm according to the compensation model, and the corrected gas concentration is sent to a display screen.
As an optional implementation manner, the processing module communicates with the background terminal through the communication module to send the alarm information to the background terminal for overrun alarm.
As an optional implementation mode, the communication module adopts a data transmission radio station modulated by LoRa, the working frequency band is 850.125-930.125 MHz, an RS232/RS485 interface is provided, and wide voltage input is supported.
In a second aspect, the present invention provides a detection method using the mixed gas detection system of the shield tunnel, including:
presetting a gas concentration threshold;
pre-training a measured value and a standard value after different gases with known concentrations are mixed to obtain a compensation model;
after receiving the mixed gas to be detected, detecting the concentrations of oxygen and carbon dioxide by an ambient gas detection module;
after the mixed gas to be detected is subjected to primary separation through a gas separation membrane, combustible gas is separated, and the concentration of the combustible gas is detected through a combustible gas detection module;
after the residual gas is subjected to secondary separation by a specific catalyst, various toxic gases are separated, and the concentration of various toxic gases is detected by a toxic gas detection module;
and correcting the concentrations of the various gases based on the compensation model, judging whether the gas concentration threshold value is overrun or not according to the corrected gas concentration, and if the gas concentration threshold value is overrun, sending out overrun alarm.
Compared with the prior art, the invention has the beneficial effects that:
the mixed gas detection system of the shield tunnel provided by the invention realizes the real-time monitoring of eight gases in the tunnel environment; and a secondary separation mechanism is adopted, combustible gas is separated through a gas separation membrane, various toxic gases are separated through specific catalysts in various single gas reactions, two separation processes are formed, and after the two times of separation, a data result is corrected for the third time based on a large amount of existing gas correlation monitoring data.
Because the space in the environment of the shield tunnel, especially the space near the shield body carrying the gas sensing monitoring equipment is narrow and limited, the arrangement of a redundant transmission line network can not be met, the utilization efficiency of the gas information in the shield tunnel environment can be improved only by transmitting the front gas information back to the rear platform for comprehensive application, therefore, the mixed gas detection system of the invention selects a wireless technology as an information transmission means, in order to meet the field wireless data transmission requirement of the shield tunnel, the invention adopts an LPWAN (low power wide area network) technology and an LoRa (long distance radio), realizes longer distance communication and lower power consumption to the maximum extent, changes the prior compromise mode of transmission distance and power consumption, realizes the compromise of the two, has concentrated power density, the wireless communication of data in the shield tunnel environment is realized to the advantage that the interference killing feature is strong, solves the information real-time interaction problem of the gaseous monitoring facilities in the place ahead and rear operation platform.
According to the mixed gas detection system of the shield tunnel, provided by the invention, data interaction between monitoring equipment carried on the shield machine and a background terminal is realized through LoRa wireless communication, overrun alarm and platform information linkage are realized, remote monitoring in the whole process is realized, and a real-time monitoring and transmission network of data in the shield tunnel environment is formed.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic view of a mixed gas detection system of a shield tunnel according to embodiment 1 of the present invention;
fig. 2 is a schematic diagram of a mixed gas detection module of a mixed gas detection system of a shield tunnel according to embodiment 1 of the present invention;
fig. 3 is an alarm interface of a mixed gas detection system of a shield tunnel according to embodiment 1 of the present invention;
fig. 4 is a schematic front view of a mixed gas detection system of a shield tunnel according to embodiment 1 of the present invention;
fig. 5 is a schematic bottom view of a mixed gas detection system of a shield tunnel according to embodiment 1 of the present invention;
fig. 6 is a schematic data display diagram of a mixed gas detection system of a shield tunnel according to embodiment 1 of the present invention;
the system comprises an oxygen sensor 1, a carbon dioxide sensor 2, a combustible gas sensor 3, a toxic gas sensor 4, a processing module 5, a communication module 6, a communication module 7, a gas separation membrane 8, a gas receiving device 9, an alarm player 10, an alarm indicator lamp 11, a fault indicator lamp 12, a power indicator lamp 13, a display screen 14, a gas concentration display interface 15, a measurement function key 16, a calibration function key 17 and a setting function key.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and it should be understood that the terms "comprises" and "comprising", and any variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
Example 1
As described in the background, there are two technical problems for gas detection during the construction of a shield tunnel: one is that the eight gases are independent, and the monitoring data of each gas need to be ensured not to generate cross interference with each other; and secondly, concentration information obtained by monitoring equipment on the front shield machine needs to be wirelessly transmitted to a rear computer platform.
Based on this, the present embodiment provides a mixed gas detection system suitable for a shield tunnel, as shown in fig. 1, including: the device comprises a mixed gas detection module, a processing module and an alarm module; the mixed gas detection module comprises an environment gas detection module, a combustible gas detection module and a toxic gas detection module which are sequentially connected, and a gas separation membrane is arranged between the environment gas detection module and the combustible gas detection module;
the environment gas detection module is used for receiving the detected mixed gas and detecting the concentrations of oxygen and carbon dioxide in the mixed gas; the combustible gas detection module is used for detecting the concentration of the combustible gas separated by the gas separation membrane; the toxic gas detection module is used for detecting the concentration of toxic gas in the residual gas;
the processing module receives gas concentrations of different gases, is configured to correct the gas concentrations based on a trained compensation model, and judges whether the gas concentrations exceed limits according to the corrected gas concentrations; the compensation model is obtained by training a measured value and a standard value after different gases with known concentrations are mixed;
the alarm module is used for alarming in an overrun mode.
In this embodiment, as shown in fig. 2, the ambient gas detection module includes an ambient gas sensor, specifically, an oxygen sensor 1 and a carbon dioxide sensor 2, configured to detect the concentrations of oxygen and carbon dioxide in the mixed gas, respectively.
The combustible gas detection module comprises a combustible gas sensor 3 for monitoring the combustible gas in real time; preferably, the combustible gas comprises methane (CH)4)。
The toxic gas detection module comprises a toxic gas sensor 4 for monitoring the toxic gas in real time; preferably, the toxic gas comprises hydrogen sulfide (H)2S), carbon monoxide (CO), sulfur dioxide (SO)2) Nitrogen dioxide (NO)2) Ammonia (NH)3)。
In this embodiment, the system further includes a gas receiving device 8, which is connected to the ambient gas sensor and disposed at the bottom of the whole hybrid detection system, and includes eight gas receiving ports for performing detection tests on different gases.
In the embodiment, a gas separation membrane 7 is arranged between the environment gas detection module and the combustible gas detection module and is used for separating the mixed gas for the first time so as to separate out the combustible gas;
after the mixed gas passes through the environment gas detection module and the combustible gas detection module, the obtained residual gas is subjected to secondary separation through a specific catalyst before detection, and after various toxic gases are separated, the toxic gases are respectively detected.
In this embodiment, the process of detecting different gas concentrations in the mixed gas detection module includes:
further, the oxygen sensor 1 is used for oxygen O2Monitoring in real time, and obtaining the oxygen concentration by utilizing an electrochemical principle;
the specific process comprises the following steps: two electrodes are contained in the sealed container, namely a cathode is PTFE (polytetrafluoroethylene) coated with an active catalyst, and an anode is a lead block; the two electrodes are soaked in a solution filled with electrolyte in the sensor, so that redox reaction can be exchanged between the electrodes; when oxygen entering the oxygen sensor 1 reaches the cathode of the working electrode, it is immediately reduced to release hydroxide ions:O2+2H2O+4e-→4OH-these hydroxide ions pass through the electrolyte to the anode and undergo a further oxidation reaction with the lead to form the corresponding metal oxide: 2Pb +4OH-→2PbO+2H2O+4e-(ii) a The redox reaction generates electron exchange to generate current, the current depends on the oxygen concentration, and the oxygen concentration can be accurately measured by the potential difference formed by the measuring circuit.
Further, the carbon dioxide sensor 2 is used for carbon dioxide CO2The real-time monitoring is carried out, compared with the previous methods for measuring electron transfer by adopting chemical reaction, the monitoring method is different, and the concentration of the carbon dioxide is obtained by adopting a non-dispersive infrared principle according to Lambert-Beer law;
the specific process comprises the following steps: when monochromatic light vertically passes through a uniform non-scattering light absorption substance, the absorbance of the monochromatic light is in direct proportion to the concentration of the light absorption substance, and in all target monitoring gases, the absorption peak of carbon dioxide to an infrared light source with a specific wavelength is more definite, and is not overlapped with the absorption peaks of other gases, so that the specificity is obvious, and quantitative monitoring is carried out by adopting the method. The method is characterized in that an optical sensor based on a non-dispersive infrared principle is adopted, the optical sensor has specificity and high precision for measuring carbon dioxide gas, an infrared light source emits infrared light with the wavelength of 1-20 mu m, the infrared light is absorbed by a certain gas chamber and passes through a narrow-band filter with the wavelength of 4.26 mu m, the infrared sensor monitors the intensity of the infrared light with the wavelength of 4.26 mu m, and the difference is calculated to reversely deduce CO2The concentration of the gas.
Further, the combustible gas sensor 3 is used for detecting combustible gas (CH)4) Monitoring in real time, and obtaining the concentration of the combustible gas by utilizing a catalytic combustion principle;
the specific process comprises the following steps: the single monitoring element is formed by wrapping alumina on a platinum wire coil, coating a catalytic layer of rare metals such as platinum, palladium and the like on the outer surface of the platinum wire coil, electrifying the platinum wire to enable the monitoring element to keep high temperature (300-400 ℃), and enabling the monitoring element to be burnt on the catalytic layer if the monitoring element is contacted with combustible gas, wherein the temperature of the platinum wire coil is increased due to heat released in combustion reaction, the resistance value of a corresponding ground coil is also increased, and the concentration of the combustible gas is obtained by measuring the change of the resistance value of the platinum wire.
Further, the toxic gas sensor 4 is used for detecting toxic gas (H)2S、CO、SO2、NO2、NH3) Monitoring in real time, and obtaining the current toxic gas concentration by using an electrochemical principle;
the specific process comprises the following steps: each single monitoring sensor comprises two electrodes, namely a sensing electrode and a negative electrode, which are simultaneously in an electrolyte environment, wherein the sensing electrode adsorbs toxic gas, redox reaction is carried out in the electrolyte environment along with electron transfer, current is formed on an external circuit, the current generated in the way is proportional to the gas concentration of the sensing electrode, and the current content of the toxic gas can be measured according to the current.
In this embodiment, the gas separation membrane 7 is a gas separation membrane made of propyl vinyl sulfoxide modified polyvinyl alcohol as a main material, and is used for separating combustible gas such as methane (CH) by utilizing the characteristics of sulfur and hydrogen repellency and hydrophilicity4) With hydrogen sulfide (H) as an interfering gas2S) and carbon monoxide (CO) for the combustible gas (CH)4) Monitoring of (3).
In this embodiment, the specific catalyst is used for catalyzing gas, so that the redox reaction of the target gas to be monitored greatly increases the speed and specific gravity, and further, the target gas is separated in fact and effect; the method specifically comprises the following steps:
using vanadium pentoxide (V)2O5) For sulfur dioxide (SO)2) Carrying out catalysis;
using titanium dioxide (TiO)2) For nitrogen dioxide (NO)2) Carrying out catalysis;
using magnesium aluminum composite oxide (Mg)3AlO) to hydrogen sulfide (H)2S) catalyzing;
using aluminum oxide (Al)2O3) Catalyzing carbon monoxide (CO) with a mixed preparation of palladium (Pd);
using chromium oxide (Cr)2O3) For ammonia (NH)3) To carry out catalysisAnd (4) transforming.
In this embodiment, the processing module 5 adopts an STM32 microcontroller, and provides a concentration analysis of the target gas through an integrated operational amplifier circuit; in the embodiment, based on a large amount of existing gas-related monitoring data, an orthogonal test is designed in the early stage, a comparison relation between a measured value and a standard value when target monitoring gases with different concentrations are mixed is established, and the data relation is recorded as a standard sample, so that a nonlinear compensation mathematical model of the sensor is established; according to the compensation model, a neighbor classification data algorithm is adopted, the mutual influence relation is stored and packaged in the processing module 5, the output measurement value of the sensor under the actual condition is corrected, and finally the gas concentration obtained after correction is displayed on the display screen 13.
In the embodiment, a neighbor classification algorithm is adopted to realize cross interference prevention among different gases.
In the present embodiment, the display screen 13 is a color touch display screen for displaying the measured gas concentration and related operation instructions;
preferably, as shown in FIG. 3, the interface of the display 13 includes CH4、CO、H2S、NO2、SO2、NH3、O2、CO2A gas concentration display interface 14, a measurement function key 15, a calibration function key 16 and a setting function key 17.
Preferably, as shown in fig. 4, an indicator light set is further disposed on the display screen, and the indicator light set includes an alarm indicator light 10, a fault indicator light 11, and a power indicator light 12.
In this embodiment, after the processing module compares the corrected gas concentration with the concentration threshold, if the current gas concentration exceeds the concentration threshold, the processing module sends alarm information to the alarm module, so that the alarm module performs overrun alarm.
In this embodiment, the alarm module includes an audible and visual alarm, specifically, an alarm player 9 and an alarm indicator light 10; as shown in fig. 5, the alarm player 9 and the gas receiving device 8 are arranged at the bottom of the system;
preferably, the alarm is designed to be an alarm buzzer sound above 90 decibels and a wide-angle flashing alarm in consideration of the generally complicated working environment of the shield tunnel.
In this embodiment, processing module 5 is through communication module 6 and backstage terminal communication, through alarm control module when sending alarm information to backstage terminal, carries out the transfinite warning, realizes that certain or multiple harmful gas component exceeds standard in the tunnel, except that the place ahead monitoring facilities carries out audible and visual alarm, rear control terminal also will show the warning, in time reminds the control personnel in order to formulate quick accurate counter-measure.
Preferably, the communication module 6 adopts a data transmission radio station of a military grade LoRa modulation technology, the data transmission radio station works in a (850.125-930.125 MHz) frequency band, the radio station provides a transparent RS232/RS485 interface, and wide voltage input is supported.
In this embodiment, the mixed gas detection system further includes a storage module, configured to store real-time data of the gas concentration, so as to form a history and a working log for recording gas monitoring.
In this embodiment, an eight-in-one mixed gas detection system application method suitable for a shield tunnel is further provided, which mainly includes the following steps:
A. before use, the system is fixed at the foremost end of an equipment bridge behind a shield segment erector;
B. the equipment is started, and the power indicator lamp 12 is lightened; setting environmental parameters and gas concentration limit values by setting a function key 17; the gas concentration value is reset to zero through a calibration function key 16; by measuring the function key 15, the gas concentration of the current working surface is monitored, and the gas comprises CH4、CO、H2S、NO2、SO2、NH3、O2、CO2；
C. After gas existing on the working surface enters the gas receiving device, the sensor receives a gas signal, and firstly, an ambient gas sensor of the oxygen sensor 1 and the carbon dioxide sensor 2 receives the gas signal to obtain the concentration of oxygen and carbon dioxide; then passing through a gas separation membrane 7 using propyl vinyl sulfoxide modified polyvinyl alcohol as a main material to separate combustible gas methane (CH)4) From interfering gasesBulk hydrogen sulfide (H)2S) and carbon monoxide (CO) are separated, and a combustible gas sensor 3 receives a gas signal to obtain concentration data of the combustible gas;
D. separating off the residual gas by means of a specific catalyst, i.e. using vanadium (V) pentoxide2O5) For sulfur dioxide (SO)2) Carrying out catalysis; using titanium dioxide (TiO)2) For nitrogen dioxide (NO)2) Carrying out catalysis; using magnesium aluminum composite oxide (Mg)3AlO) to hydrogen sulfide (H)2S) catalyzing; using aluminum oxide (Al)2O3) Catalyzing carbon monoxide (CO) with a mixed preparation of palladium (Pd); using chromium oxide (Cr)2O3) For ammonia (NH)3) Catalyzing, and obtaining gas concentration data of various toxic gases through a toxic gas sensor 4 based on a catalytic oxidation reduction reaction as a principle;
E. designing an orthogonal test in the early stage based on a large amount of existing gas associated monitoring data, establishing a comparison relation between a measured value and a standard value when target monitoring gases with different concentrations are mixed, and recording the data relation as a standard sample so as to construct a nonlinear compensation mathematical model of the sensor; according to the compensation model, a neighbor classification data algorithm is adopted, the mutual influence relation is stored and packaged in the processing module 5, the output measurement value of the sensor under the actual condition is corrected, and finally the gas concentration obtained after correction is displayed on the display screen 13;
F. when the corrected gas concentration data exceeds the specified limit value shown in table 1, the alarm starts to work, the alarm indicator lamp 10 is turned on, and the alarm player 9 sends out alarm buzzing sound of more than 90 decibels;
G. meanwhile, data are transmitted to the background terminal through the communication module 6, a working log is formed by analyzing, sorting and storing the data and recording the history of gas monitoring, and the number of monitored gases and the number of detected gas alarms are displayed, as shown in fig. 6.
The system is simple to operate and high in practicability, can improve the utilization efficiency of gas information, realizes real-time monitoring of eight gases in the tunnel environment and wireless data transmission in the shield tunnel environment, and ensures safe tunneling of shield construction.
TABLE 1 monitoring targets and limits
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. The utility model provides a shield tunnel's mist detecting system which characterized in that includes: the device comprises a mixed gas detection module, a processing module and an alarm module; the mixed gas detection module comprises an environment gas detection module, a combustible gas detection module and a toxic gas detection module which are sequentially connected, and a gas separation membrane is arranged between the environment gas detection module and the combustible gas detection module;
the environment gas detection module is used for receiving the detected mixed gas and detecting the concentrations of oxygen and carbon dioxide in the mixed gas; the combustible gas detection module is used for detecting the concentration of the combustible gas separated by the gas separation membrane; the toxic gas detection module is used for detecting the concentration of toxic gas in the residual gas;
the processing module receives gas concentrations of different gases, is configured to correct the gas concentrations based on a trained compensation model, and judges whether the gas concentrations exceed limits according to the corrected gas concentrations; the compensation model is obtained by training a measured value and a standard value after different gases with known concentrations are mixed;
the alarm module is used for alarming in an overrun mode.
2. The mixed gas detection system of the shield tunnel according to claim 1, wherein before the toxic gas detection module detects the concentration of the toxic gas in the residual gas, a specific catalyst is used to perform a secondary separation on the residual gas to separate various types of toxic gas.
3. The mixed gas detection system of the shield tunnel according to claim 2, wherein the secondary separation of the residual gas by using the specific catalyst comprises: catalyzing sulfur dioxide by adopting vanadium pentoxide; catalyzing nitrogen dioxide by adopting titanium dioxide; catalyzing hydrogen sulfide by adopting a magnesium-aluminum composite oxide; catalyzing carbon monoxide by adopting a mixed preparation of aluminum oxide and palladium; the ammonia gas is catalyzed by chromium oxide.
4. The mixed gas detection system of the shield tunnel according to claim 1, wherein in the ambient gas detection module, an oxygen sensor is used to detect the oxygen concentration based on an electrochemical principle, and a carbon dioxide sensor is used to obtain the carbon dioxide concentration based on a non-dispersive infrared principle.
5. The mixed gas detection system of the shield tunnel according to claim 1, wherein a combustible gas sensor is adopted in the combustible gas detection module to obtain the concentration of the combustible gas based on a catalytic combustion principle;
the toxic gas detection module adopts a toxic gas sensor to obtain the concentration of toxic gas based on an electrochemical principle, and the toxic gas comprises sulfur dioxide, nitrogen dioxide, hydrogen sulfide, carbon monoxide and ammonia gas.
6. The mixed gas detection system of the shield tunnel according to claim 1, wherein the gas separation membrane is a gas separation membrane made of propyl vinyl sulfoxide modified polyvinyl alcohol, and combustible gas is separated based on the characteristics of sulfur and hydrogen.
7. The system of claim 1, wherein in the processing module, the gas concentration is corrected by a neighbor classification data algorithm according to the compensation model, and the corrected gas concentration is sent to a display screen.
8. The mixed gas detection system of the shield tunnel according to claim 1, wherein the processing module communicates with the background terminal through the communication module to send alarm information to the background terminal for overrun alarm.
9. The mixed gas detection system of the shield tunnel according to claim 8, wherein the communication module employs a data transmission station modulated by LoRa, the working frequency band is 850.125-930.125 MHz, an RS232/RS485 interface is provided, and a wide voltage input is supported.
10. A method of testing a mixed gas testing system using a shield tunnel according to any one of claims 1 to 9, comprising:
presetting a gas concentration threshold;
pre-training a measured value and a standard value after different gases with known concentrations are mixed to obtain a compensation model;
after receiving the mixed gas to be detected, detecting the concentrations of oxygen and carbon dioxide by an ambient gas detection module;
after the mixed gas to be detected is subjected to primary separation through a gas separation membrane, combustible gas is separated, and the concentration of the combustible gas is detected through a combustible gas detection module;
after the residual gas is subjected to secondary separation by a specific catalyst, various toxic gases are separated, and the concentration of various toxic gases is detected by a toxic gas detection module;
and correcting the concentrations of the various gases based on the compensation model, judging whether the gas concentration threshold value is overrun or not according to the corrected gas concentration, and if the gas concentration threshold value is overrun, sending out overrun alarm.
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