CN113804839B - Disaster area environment multi-parameter fusion monitoring and explosion hazard diagnosis system and device - Google Patents
Disaster area environment multi-parameter fusion monitoring and explosion hazard diagnosis system and device Download PDFInfo
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Abstract
The invention relates to the technical field of disaster area emergency rescue, in particular to a disaster area environment multi-parameter fusion monitoring and explosion hazard diagnosis system and device. The invention adopts the fusion judgment rule of the explosion concentration limit weighting treatment to comprehensively present the safety state of the disaster area environment in real time, dynamically constructs the flammable mixed gas to synthesize an explosion triangle, and then gives the diagnosis result of the disaster area environment explosion hazard by a partition analysis method. The invention efficiently extracts complex, variable and high-amplitude multi-parameter information in a disaster area strong noise environment, and adopts methods of information fusion, flammable mixed gas safety state judgment and identification and the like to carry out environment detection, safety early warning and danger assessment.
Description
Technical Field
The invention relates to the technical field of disaster area emergency rescue, in particular to a disaster area environment multi-parameter fusion monitoring and explosion hazard diagnosis system and device which are convenient for rescue workers to carry and are used for exploring high-concentration toxic and harmful gas accumulation places or closed inerting areas after disaster accidents in the fields of coal mines, non-coal mines, hazardous chemicals, oil gas pipelines and the like.
Background
The complexity and dynamic variability of gas explosion and fire accidents determine the disaster relief difficulty, danger and technical property, threaten personnel evacuation and disaster relief work, and increase the disaster relief decision and the difficulty and danger of on-site rescue. Failure to obtain information, e.g. CH, quickly and accurately at disaster site after accident 4 Concentration, location of trapped or victim, on site temperature, O 2 And the content of harmful gases such as CO, the on-site collapse condition and the like, thereby delaying the development of rescue work. After gas explosion, secondary explosion is very likely to happen, so that the injury to the personnel in danger is greatly increased, the requirement of rapid rescue forces the rescue personnel to go deep into the disaster area for detection, but the emergency rescue team lacks advanced equipment with exquisite technology and reliable performance, the rescue can only adopt daily production monitoring and hidden danger investigation equipment, the dangerous state of the accident scene cannot be effectively judged and predicted, and the life safety of rescue team members is also directly threatened. In addition, the fire combustion consumes oxygen in the wind flow, so that the oxygen concentration in the wind flow is reduced, and a large amount of heat energy and H are generated 2 S, CO and CO 2 And toxic and harmful gases and dust, which have the consequence of burning, poisoning or choking personnel in the polluted area, and even causing coal dust, gas explosion or coal dust and gas explosion under the coal mine, leading to larger disasters. In order to ensure life safety of rescue workers, disaster detection, personnel search and rescue and communication establishment are carried out by aid of rescue special robots, the robot is suitable for environments where workers cannot enter and the content of toxic and harmful gases is high, but the current stage is still in a model prototype test stage, and key technical problems such as environmental adaptability, obstacle surmounting capability, intelligent degree and the like are still to be solved, and the robot is still poor from practical applicationAlthough the fire protection and danger accident prevention device is applied to fire protection and danger accidents, no successful cases exist in mine fields with more complex disaster area environments.
At present, multi-specification serial portable equipment for gas leakage, nuclear leakage radiation and harmful gas safety detection in electric power and municipal pipelines, iron smelting and steel making factories and the like in chemical industry and pharmaceutical workshops has been developed at home and abroad, the configuration is very flexible, dozens of combustible or toxic gas sensing elements can be selected, the equipment can be customized to meet the high-concentration testing requirement of gas components, but only can visually display data and threshold overrun alarm, and correlation of multi-parameter information, safety of environmental conditions and the like cannot be deeply analyzed on line. Considering the current state of the art and the possibility of technical development in a short period, there is a need to continue to improve and enhance the technology and equipment for rapid detection and analysis of environmental parameters for individual soldiers, in particular to enhance the applicability to mine underground disaster accidents. Domestic existing hand-held mine multi-parameter detecting instrument has limited measuring range (CH) 4 The upper limit of concentration measurement is 10%, and the upper limit of concentration measurement of CO is 1000 ppm), and the temperature and CO are not provided basically 2 Concentration detection function, and mining advanced detection device capable of wirelessly returning data after passing through pneumatic emission sensing elements, and CO thereof 2 The upper limit of concentration measurement is only 20%, the upper limit of temperature measurement is only 60 ℃, and the method is difficult to be applied to high-concentration toxic and harmful gas environments in disaster areas, for example, the CO concentration in the mine high-temperature fire accident site can reach more than 5000ppm and even 10000ppm, and the CH in the gas accident site 4 The concentration can rise to 100%, and the explosion risk of the combustible gas cannot be analyzed, and a few instruments integrated with the gas explosiveness measuring function have the temperature and CH 4 Although the upper limit of the CO concentration measurement is increased (the upper limit of the temperature measurement is increased to 75 ℃ C., CH) 4 The upper limit of concentration measurement is increased to 60%, and the upper limit of concentration measurement of CO is increased to 2000 ppm), but the method is mainly used for normal production inspection and hidden trouble investigation, and meanwhile, the method is faced with incapability of detecting CO 2 The concentration and gas detection deviation are large, the temperature parameters are not involved in gas explosiveness analysis, the effective fusion early warning strategy for the multi-parameter information of the mixed gas is lacked, and the single gas explosiveness analysis mathematical model is not suitable for the combustible mixed gas and the process data do not perform necessary movementsThe problems of state compensation, correction and the like are not solved, and high false alarm hidden danger exists. In addition, for inerting treatment of a closed space, the temperature is easy to gradually drop to minus along with the injection of a liquid inert medium, the concentration after the medium gasification is stable is easy to gradually rise to 95% along with the increase of the injection amount, the conventional portable mining multi-parameter detection and analysis instrument is not applicable, and the best occasions of the injection and blocking of the inert medium, the quick construction and unsealing and dismantling of a sealing device and the like are quantitatively judged by reserving a wind hole and regularly sampling and analyzing gas components by a beam tube monitoring means, but the operation of beam tube monitoring is complex, equipment is huge, the upper measurement limit is low, and the technical problems are still needed to be faced and solved.
Disclosure of Invention
The invention provides a multi-parameter environment detection and gas explosiveness determination system for disaster area emergency rescue, which forms a specific technical method for on-line monitoring of a safety state and accurate recognition of dangerous degree based on multi-parameter signals of disaster area environment, further improves the applicability and functional diversity of the existing equipment, provides basis for personal protection, airtight space entry, scientific establishment of rescue schemes, stage check of disaster situation treatment effects and the like, avoids influence on establishment of rescue schemes and injury to rescue workers caused by unknown environmental information investigation or experience judgment, and realizes scientific rescue.
The basic scheme provided by the invention is as follows: the disaster area environment multi-parameter fusion monitoring and explosion hazard diagnosis system comprises a wide-range composite sampling device, a signal conditioning module, an A/D module and an integrated circuit chip;
the wide-range composite sampling device is provided with a temperature measuring module and an infrared CO 2 Gas sensor element, CO 2 Signal conversion and temperature compensation module and infrared CH 4 Gas-sensitive sensor element, CH 4 Signal conversion and temperature compensation module, electrochemical CO gas sensor element and electrochemical H 2 S gas sensor element and electrochemical O 2 A gas-sensitive sensing element; the infrared type CO 2 CO collected by gas-sensitive sensing element 2 Concentration signal by CO 2 Conversion of signal and temperature compensation modules to CO 2 A concentration digital signal;the infrared type CH 4 CH collected by gas-sensitive sensing element 4 Concentration signal by CH 4 Conversion of signal and temperature compensation module into CH 4 A concentration digital signal;
the wide-range composite sampling device is internally integrated with a temperature measuring module and an infrared type gas-sensitive sensing element and an electrochemical type gas-sensitive sensing element which can collect a natural diffusion type or pumping type gas inlet sample, and is externally provided with six signal ports; the channel number of the six signal ports is AO1-AO6, which are sequentially used for transmitting temperature digital signals and CO 2 Digital signal of concentration, CH 4 Digital concentration signal, analog concentration signal, H 2 S concentration analog signal and O 2 A concentration analog signal; the CO concentration analog signal, H 2 S concentration analog signal and O 2 The concentration analog signals are transmitted to the signal conditioning module and the A/D module through the signal port;
the signal conditioning module is used for outputting CO and H output by the wide-range composite sampling device 2 S、O 2 The concentration three-way analog signal processing forms a voltage signal which has strong anti-interference capability in a strong noise environment and accords with the digital signal conversion input range; the A/D module is used for reading and converting concentration analog signals output by the signal conditioning module into binary digital quantities in batches in a grouping acquisition or continuous acquisition mode and transmitting the binary digital quantities to the integrated circuit chip; the temperature digital signal and CO 2 Digital concentration signal and CH 4 The concentration digital signal is transmitted to the integrated circuit chip through a signal port.
Further, the integrated circuit chip is provided with a multi-parameter fusion monitor and an explosion hazard diagnostic device which operate on line in real time. Wherein, the multi-parameter fusion monitor can effectively convert the temperature and the concentration value of each path of gas component, and monitor the environmental state by means of statistics calculated from each path of batch data respectively, so as to use CH 4 、CO、H 2 S three combustible gas component concentration statistic and safety line threshold comparison method and CH thereof 4 、CO、H 2 S, taking the sum of the concentration statistics of the three combustible gas components and the explosion concentration limit comparison method of the combustible gas mixture as a weighting fusion judgment rule ensembleAnd carrying out safety state evaluation on the disaster area environment. When the monitoring quantity of the combustible gas components exceeds a set threshold value and reaches a limit number of times, the environment is proved to be in an unsafe state, the multi-parameter fusion monitor alarms at the moment, and when the fusion judgment characteristic quantity is in the upper and lower limit ranges of the explosion concentration of the combustible gas mixture at the actual measurement temperature, the environment is proved to be in an explosive state, and the multi-parameter fusion monitor alarms again at the moment; after the multi-parameter fusion monitor sends out early warning information, the explosion hazard diagnostic device is driven to operate, a flammable mixed gas is drawn to form an explosion triangle through synthesis and normalization, and accurate decision is made on whether the explosion condition is met or not and the measures to be taken according to the corrected mixed gas composition state point position and the hazard of the area where the mixed gas composition state point position is located;
the multi-parameter fusion monitor comprises a data average value calculation module and a concentration average value calculation module, wherein the data average value calculation module is used for calculating the average value of transmission data in unit time of each signal port, and the real concentration average value of the corresponding average value of the transmission data of the electrochemical gas-sensitive sensor element is calculated through amplification reduction and temperature compensation;
the multi-parameter fusion monitor is also provided with a concentration threshold value and a frequency threshold value, and when the frequency of the combustible gas component concentration average value larger than the concentration threshold value reaches the frequency threshold value, the multi-parameter fusion monitor sends out a first alarm signal;
the multi-parameter fusion monitor also comprises a characteristic quantity calculation module and an explosion concentration limit interval calculation module; the characteristic quantity calculating module is used for calculating fusion judgment characteristic quantity according to the component concentration average value of the combustible gas; the explosion concentration limit interval calculation module is used for calculating the upper and lower limit ranges of the explosion concentration of the combustible gas mixture at the actually measured temperature;
when the fusion judgment characteristic quantity is within the upper limit and the lower limit of the explosion concentration of the combustible gas mixture, the multi-parameter fusion monitor sends out alarm information and drives an explosion hazard diagnostic device;
the explosion hazard diagnostor comprises an explosion triangle analysis module and a measure generation module; the explosion triangle analysis module is used for generating an explosion triangle and calculating and correcting the P coordinate of the mixed gas composition state point; the explosion triangle is divided into a plurality of areas according to the dangerous degree; the measure generating module generates countermeasures according to the region where the mixed gas composition state point P is located in the explosion triangle.
Further, the data average calculating module is configured to calculate an average mean (CH) of transmission data in unit time of each signal port, where the formula is:
wherein x is i (CH) is the number of individual data in the channel CH in the channel array DZ (n, 6), n is the number of individual data in the channel CH;
the concentration average value calculation module is used for calculating a true concentration average value mean (CH) of an average value corresponding to transmission data of the electrochemical gas sensor element through amplification reduction and temperature compensation, and the formula is as follows:
where CH is a channel number, f (T) is a temperature curve function of the measured temperature T, f (mean (1)) is a value of the temperature curve function when the measured temperature T is equal to mean (1), and D is a signal magnification.
Further, the explosion concentration limit interval calculation module comprises a gas explosion concentration calculation module and a mixture explosion concentration calculation module;
the gas explosion concentration calculation module is used for calculating the upper limit N of the explosion concentration of the combustible gas at the measured temperature UT (CH) and lower explosive concentration limit N LT (CH)：
Wherein N is U (CH)、N L (CH) is the upper and lower explosion limits of each combustible gas at 25 ℃;
the mixture explosion concentration calculation module calculates the upper limit N of the explosion concentration of the combustible gas mixture at the measured temperature through weighting treatment Um And a lower limit N Lm ：
Further, the characteristic quantity calculating module is used for calculating the characteristic quantity of the CH by aiming at the CH 4 、CO、H 2 And S, accumulating the concentration mean values of the three combustible gas components to obtain a fusion judgment feature quantity M:
further, the explosion triangle includes three vertex coordinates, that is, coordinates of the upper limit point a (X A ，Y A ) Coordinates of the lower limit point B (X B ，Y B ) Coordinates of critical point C (X C ，Y C ) The following formulas were calculated by the explosive triangle synthesis:
wherein (X) A (CH)，Y A (CH)) is the coordinates of the upper limit point A of each flammable gas explosion triangle; (X) B (CH)，Y B (CH)) is the coordinate of the lower limit point B of each flammable gas explosion triangle; CH (CH) 4 、CO、H 2 S three kinds of combustible gas, when each of the combustible gas contains an excessive amount of inert gas component, the coordinates (X C (CH)，Y C (CH)) is calculated as follows:
wherein (X) C (CH) C ，Y C (CH) C ) Is super CO 2 Time CH 4 、CO、H 2 Coordinates of critical point C of each explosion triangle of S three combustible gases, (X) C (CH) N ，Y C (CH) N ) Is more than N 2 Time CH 4 、CO、H 2 S coordinates of critical points C of each explosion triangle of three combustible gases, mean (2) and 3.73mean (6) are respectively two excessive inert gas components CO in the mixed gas 2 And N 2 Concentration of N 2 The component concentration is obtained by adopting an oxygen measurement principle.
Further, the mixed gas constitutes the state point P coordinate, i.e. (X) P ，Y P ) Calculated as follows:
further, the coordinates of the mixture gas composition state point P after correction, that is, (X P ’，Y P '), calculated according to the following formula:
wherein, c CH 、d CH 、e CH 、f CH 、c CH ’、d CH ’、e CH ’、f CH ' is CH 4 、CO、H 2 S three combustible gas conversion coefficients, alpha is CO 2 Influence coefficient, beta, on the explosion triangle CH Is O 2 Influence coefficient on P point coordinates, said alpha and beta CH Calculated as follows:
wherein a is CH 、b CH Is CH 4 、CO、H 2 S three combustible gas conversion coefficients.
Further, the explosion triangle is divided into 4 areas according to the danger degree, namely an explosion danger area, a wind reduction danger area, a wind increase danger area and a wind increase and decrease safety area, and the measure generation module generates countermeasures according to the area where the mixed gas composition state point P is located in the explosion triangle.
The disaster area environment multi-parameter fusion monitoring and explosion hazard diagnosis device adopts any disaster area environment multi-parameter fusion monitoring and explosion hazard diagnosis system.
The beneficial effects of the invention are as follows:
1. the invention uses CH 4 、CO、H 2 S three main combustible gas components in disaster areas and O closely related to combustion explosion 2 CO as a common inert medium 2 As a tested object, and is mainly applicable to the environmental characteristics and CO injection of the field 2 The process technology for inerting hazardous areas is consistent.
2. Aiming at the physical and chemical properties of the gas components to be detected and the current gas sensing technology, the infrared type and electrochemical type gas sensing elements are selected in a differentiated mode, and implementation ways of multi-parameter signal acquisition, processing and transmission are presented.
3. The invention sets the safety threshold of each combustible gas component, such as the coal mine underground, CH 4 The concentration should not exceed 1.5% of its threshold value, and the CO concentration should not exceed 24PPm of its threshold value, so as to prevent gas explosion and fire accidentAnd the threat of secondary accidents.
4. The invention introduces the digital temperature signal detection function, can intuitively and quantitatively reflect the high-low temperature characteristics of the complex environment in the processes of fire accident scene search, dangerous area inerting effect judgment and the like, and provides key information for compensating the temperature drift of the detection result of the electrochemical gas-sensitive sensing element and correcting the upper and lower limits of the explosion concentration of the combustible gas.
5. The invention takes the average value of the data acquired and read by the corresponding channels of each sensing element as the effective value of display and analysis, and takes the over-threshold times of the concentration average value of the combustible gas component as the macroscopic judgment basis of whether the environmental state is safe or not and the triggering condition of alarm prompt, thereby enhancing the detection accuracy and reducing the false alarm rate.
6. According to the volume share of each combustible component in the mixed gas, the invention obtains the explosion concentration limit of the mixture containing multiple combustible gas components along with the change of temperature through weighting each single combustible gas explosion concentration limit, uses the sum of the concentration averages of the combustible gas components as the characteristic quantity of the mixed gas explosion risk fusion judgment as the standard of the mixed gas explosion risk fusion judgment, compares and analyzes the sum of the concentration averages in real time, and indicates the possibility of explosion when the sum is positioned in the upper limit and the lower limit of the former, and then triggers a second alarm prompt.
7. On the basis of the existing single flammable gas explosion triangle, the invention expands an on-line construction method for synthesizing the explosion triangle by the mixture containing multiple flammable gas components, integrates a coordinate correction algorithm of gas composition state points and a safe state partition theory of mixed gas, can accurately diagnose the explosion risk degree of the mixed gas by locating the coordinate in the region of the mixed gas synthesis explosion triangle, can trigger a third alarm prompt when the mixed gas composition state points are in the explosion risk region, and simultaneously gives technical guidance on how to safely cope with.
Drawings
FIG. 1 is a system composition diagram of the disaster area environment multi-parameter fusion monitoring and explosion hazard diagnosis system of the present invention.
FIG. 2 is a flow chart of the operation of the multi-parameter fusion monitor of the present invention.
Fig. 3 is a flowchart showing the operation of the explosion hazard diagnosis apparatus of the present invention.
Detailed Description
The following is a further detailed description of the embodiments:
the specific implementation process is as follows:
example 1
An embodiment is basically as shown in fig. 1, and the disaster area environment multi-parameter fusion monitoring and explosion hazard diagnosis system comprises a wide-range composite sampling device, a signal conditioning module, an A/D module and an integrated circuit chip.
The wide-range composite sampling device is internally integrated with a temperature measuring module capable of detecting (-40-125) DEG C and an infrared CO capable of detecting (0-100)% VOL 2 Gas sensor element and CO 2 Signal conversion and temperature compensation module and infrared CH capable of detecting (0-100)% VOL 4 Gas sensor element and CH 4 Signal conversion and temperature compensation module, electrochemical CO gas sensor capable of detecting (0-9999) ppm, and electrochemical H capable of detecting (0-500) ppm 2 S gas sensor element and electrochemical O capable of detecting (0-30)% VOL 2 A gas sensitive sensing element.
The wide-range composite sampling device is externally provided with six paths of AO1-AO6 signal ports, wherein the first path of signal port AO1 outputs a temperature digital signal, and the second path of signal port AO2 and the third path of signal port AO3 respectively output CO 2 、CH 4 The concentration digital signal, the fourth, fifth and sixth paths of signal ports AO4, AO5 and AO6 respectively output CO and H 2 S、O 2 A concentration analog signal; the fourth, fifth and sixth paths of signal ports AO4, AO5 and AO6 output CO and H 2 S、O 2 The concentration analog signals are sent to the signal conditioning module, and after the unified output voltage signals are processed through current-voltage conversion, filtering, amplification and the like, the unified output voltage signals are respectively connected to the A/D module for analog-to-digital conversion; CO, H output by the A/D module 2 S、O 2 Digital concentration signal, digital temperature signal output by first channel signal port AO1, second channel signal portCO output by AO2 and AO3 respectively 2 、CH 4 The concentration digital signals are transmitted to the integrated circuit chip through a serial bus; and a multi-parameter fusion monitor and an explosion hazard diagnostic device which run on line in real time are arranged in the integrated circuit chip.
The multi-parameter fusion monitor comprises a data average value calculation module and a concentration average value calculation module, wherein the data average value calculation module is used for calculating the average value of transmission data in unit time of each signal port, and the real concentration average value of the corresponding average value of the transmission data of the electrochemical gas-sensitive sensor element is calculated through amplification reduction and temperature compensation;
the multi-parameter fusion monitor is further provided with a concentration threshold value and a frequency threshold value, the frequency threshold value in the embodiment is 5 times, and when the frequency of the combustible gas component concentration average value being larger than the concentration threshold value reaches the frequency threshold value, the multi-parameter fusion monitor sends out a first alarm signal;
the multi-parameter fusion monitor also comprises a characteristic quantity calculation module and an explosion concentration limit interval calculation module; the characteristic quantity calculating module is used for calculating fusion judgment characteristic quantity according to the component concentration average value of the combustible gas; the explosion concentration limit interval calculation module is used for calculating the upper and lower limit ranges of the explosion concentration of the combustible gas mixture at the actually measured temperature;
when the fusion judgment characteristic quantity is within the upper limit and the lower limit of the explosion concentration of the combustible gas mixture, the multi-parameter fusion monitor sends out alarm information and drives an explosion hazard diagnostic device;
the explosion hazard diagnostor comprises an explosion triangle analysis module and a measure generation module; the explosion triangle analysis module is used for generating an explosion triangle and calculating and correcting the P coordinate of the mixed gas composition state point; the explosion triangle is divided into a plurality of areas according to the dangerous degree; the measure generating module generates countermeasures according to the region where the mixed gas composition state point P is located in the explosion triangle.
As shown in fig. 2, in this embodiment, after the collected digital signal enters the integrated circuit chip, the multi-parameter fusion monitor performs the following steps:
step 101: setting the channel number CH to 1 and setting the overrun number G (CH) to 0;
specifically, the channel number CH has a value of 1-6, and corresponds to temperature data and CO respectively 2 Concentration data, CH 4 Concentration data, CO concentration data, H 2 S concentration data, O 2 Concentration data.
Step 102: batch reading of data;
step 103: establishing channel data DZ (n, 6) after the binary conversion and the unit conversion;
specifically, the channel array DZ (n, 6) has each column numbered as the channel number CH, and 6 columns in total, and the maximum row number n is the total data that any channel can accommodate, for example, 512, 1024, 2048 and …, and the data corresponding to each adjacent row number in any channel is acquired at equal time intervals.
Step 104: calculating a data average mean (CH) in the channel;
specifically, the data average value calculating module performs average value processing on n data in the channel according to the channel number CH to obtain a data average value mean (CH), and calculates according to the following formula:
wherein x is i (CH) is the single data within channel CH in the channel array DZ (n, 6).
Step 105: judging whether the channel number CH is equal to 4-6, if the channel number CH is equal to 4-6, firstly calculating a real concentration mean (CH) by reducing the mean (CH) amplification factor and compensating the temperature, and then entering step 106; if the channel number CH is not equal to 4-6, directly proceeding to step 106;
specifically, the concentration average calculation module is based on electrochemical CO and H 2 S、O 2 The gas-sensitive sensing element detects the principle that the signal is amplified by a fixed coefficient and the signal ratio of a temperature curve is approximately in a linear relation, the concentration mean value is reduced in value, zero point and measuring range are corrected, and the real gas component concentration mean value (CH) obtained after the treatment is given by the following formula:
wherein CH is a channel number, f (T) is a temperature curve function of the measured temperature T, namely a signal ratio, the signal ratio is obtained by adopting a curve fitting method through calculation approximation, the fitting adopts the most commonly used least square method, f (mean (1)) is a value of the temperature curve function when the measured temperature T is equal to mean (1), and D is a signal amplification factor.
Step 106: judging whether the channel number CH is equal to 3-5, if so, acquiring a concentration threshold R (CH) firstly, and then entering step 107; if the channel number CH is not equal to 3-5, adding 1 to the channel number CH, and returning to the step 104;
step 107: judging whether the concentration mean (CH) of the combustible gas component is greater than a concentration threshold R (CH), if the concentration mean (CH) of the combustible gas component is greater than the concentration threshold R (CH), adding 1 to the overrun times G (CH), and then entering a step 108; if the flammable gas component concentration mean (CH) is less than or equal to the concentration threshold R (CH), then step 109 is entered directly;
step 108: judging whether the overrun times G (CH) reach a time threshold, if so, generating a first alarm signal, and clearing the overrun times G (CH); if the overrun number G (CH) does not reach the number threshold, directly proceeding to step 109;
step 109: calculating the upper limit N of the explosion concentration of the combustible gas at the measured temperature UT (CH) and lower explosive concentration limit N LT (CH)；
Step 110: judging whether the channel number CH is equal to 6, if the channel number CH is equal to 6, calculating the upper limit N of the explosion concentration of the combustible gas mixture at the measured temperature Um And a lower limit N Lm Step 111 is performed again; if the channel number CH is not equal to 6, adding 1 to the channel number CH, and returning to step 104;
specifically, the explosion concentration limit interval calculation module comprises a gas explosion concentration calculation module and a mixture explosion concentration calculation module;
the saidThe gas explosion concentration calculation module is used for calculating the upper limit N of the explosion concentration of the combustible gas at the measured temperature UT (CH) and lower explosive concentration limit N LT (CH)：
Wherein N is U (CH)、N L (CH) is the upper and lower explosion limits of each combustible gas at 25 ℃;
the mixture explosion concentration calculation module calculates the upper explosion concentration limit N of the combustible gas mixture at the measured temperature through weighting treatment Um And a lower limit N Lm ：
Step 111: calculating a fusion judgment feature quantity M;
specifically, the feature quantity calculating module is configured to calculate the feature quantity by comparing CH 4 、CO、H 2 And S, accumulating the concentration mean values of the three combustible gas components to obtain a fusion judgment feature quantity M:
step 112: judging whether the fusion judgment characteristic quantity M is in the upper limit N of the explosion concentration of the combustible gas mixture at the actual measurement temperature Um And a lower limit N Lm If the fusion judgment feature quantity M is in the upper limit N of the explosion concentration of the combustible gas mixture at the measured temperature Um And a lower limit N Lm Firstly, generating a second alarm signal, starting explosion hazard diagnosis, and then entering step 113; otherwise, directly enter step 113;
step 113: the channel number CH is set to 1 and the process returns to step 102.
In this embodiment, the explosion hazard diagnosis flow is implemented by an explosion hazard diagnostor as shown in fig. 3, and includes the following steps:
step 201: calculating the three-vertex coordinates of the explosion triangle synthesized by the mixed gas;
specifically, the explosion triangle includes three vertex coordinates, that is, coordinates of an upper limit point a (X A ，Y A ) Coordinates of the lower limit point B (X B ，Y B ) Coordinates of critical point C (X C ，Y C ) The following formulas were calculated by the explosive triangle synthesis:
wherein (X) A (CH)，Y A (CH)) is the coordinates of the upper limit point A of each flammable gas explosion triangle; (X) B (CH)，Y B (CH)) is the coordinate of the lower limit point B of each flammable gas explosion triangle; CH (CH) 4 、CO、H 2 S three kinds of combustible gas, when each of the combustible gas contains an excessive amount of inert gas component, the coordinates (X C (CH)，Y C (CH)) is calculated as follows:
wherein (X) C (CH) C ，Y C (CH) C ) Is super CO 2 Time CH 4 、CO、H 2 Coordinates of critical point C of each explosion triangle of S three combustible gases, (X) C (CH) N ，Y C (CH) N ) Is more than N 2 Time CH 4 、CO、H 2 S coordinates of critical points C of each explosion triangle of three combustible gases, mean (2) and 3.73mean (6) are respectively two excessive inert gas components CO in the mixed gas 2 And N 2 Concentration of N 2 The component concentration is obtained by adopting an oxygen measurement principle.
Step 202: calculating the P coordinate of the mixed gas composition state point;
specifically, the mixed gas constitutes the state point P coordinate, i.e. (X P ，Y P ) Calculated as follows:
step 203: correcting the P coordinate of the point;
specifically, the coordinates of the mixture gas composition state point P after correction, that is, (X P ’，Y P ') is calculated by an explosion triangle normalization method according to the following formula:
wherein, c CH 、d CH 、e CH 、f CH 、c CH ’、d CH ’、e CH ’、f CH ' is CH 4 、CO、H 2 S three combustible gas conversion coefficients, alpha is CO 2 Influence coefficient, beta, on the explosion triangle CH Is O 2 Influence coefficient on P point coordinates, said alpha and beta CH Calculated as follows:
wherein a is CH 、b CH Is CH 4 、CO、H 2 S three combustible gas conversion coefficients.
Step 204: drawing a mixed gas synthesized explosion triangle graph and a point P;
step 205: judging whether the point P is positioned in an explosion hazard zone (i.e. zone I), if the point P is positioned in the explosion hazard zone (i.e. zone I), generating a third alarm signal, prompting that the explosion hazard should be evacuated rapidly, and then entering step 210; if point P is not located in the explosion hazard zone (i.e., zone I), then step 206 is entered;
step 206: judging whether the point P is positioned in a wind reduction dangerous area (namely, a II area), if the point P is positioned in the wind reduction dangerous area (namely, the II area), prompting that the wind quantity should be properly increased, and then entering step 210; if point P is not located in the wind-reducing hazard zone (i.e., zone II), then step 207 is entered;
step 207: judging whether the point P is positioned in the increased-air dangerous area (namely III area), if the point P is positioned in the increased-air dangerous area (namely III area), prompting that the air quantity should be properly reduced, and then entering step 210; if point P is not located in the increased risk area (i.e., area III), then step 208 is entered;
step 208: determining that the point P is positioned in a wind increasing and decreasing safety zone (namely a zone IV);
step 209: the danger is avoided when the air quantity is increased or decreased;
step 210: ending the explosion hazard diagnosis.
Example two
The difference between the second embodiment and the first embodiment is that the disaster area environment multi-parameter fusion monitoring and explosion hazard diagnosis device in the second embodiment adopts the disaster area multi-parameter fusion monitoring and explosion hazard diagnosis system.
The foregoing is merely exemplary of the present invention, and the specific structures and features that are well known in the art are not described in any way herein, so that those skilled in the art will be aware of all the prior art to which the present invention pertains, and will be able to ascertain all of the prior art in this field, and with the ability to apply the conventional experimental means prior to this date, without the ability of those skilled in the art to perfect and practice this invention with their own skills, without the ability to develop certain typical known structures or methods that would otherwise be the obstacle to the practice of this application by those of ordinary skill in the art.
It should be noted that, for those skilled in the art, several variations and modifications can be made without departing from the structure of the present invention, and the following changes and modifications which do not affect the essential content of the present patent are also covered in the scope defined by the scope of the claims: the integrated circuit chip mainly refers to a singlechip, and can also be a system in which a processor (an arithmetic unit and a controller), a data memory (a random access memory), a program memory (a read-only memory), an I/O port, an interrupt system, a timer/counter and the like are integrated through a main board; the patent describes the method for detecting and outputting CO 2 、CH 4 The infrared type gas-sensitive sensing element of the concentration digital signal and the matched signal conversion and temperature compensation module thereof can be of a split combination type described in the patent, and can also be a double-parameter integrated detection output device integrating signal conversion and temperature compensation functions; CO and H output by the A/D module 2 S、O 2 Concentration digital signal and temperature digital signal output by first path signal port and CO output by second path signal port respectively 2 、CH 4 The concentration digital signals are transmitted to the integrated circuit chip of the patent through the serial bus of the patent, such as RS232, RS485 and the like, other communication modes such as a USB bus and the like can be adopted, and the concentration digital signals are considered as the protection scope of the invention, and the implementation effect of the invention and the practicability of the patent are not affected. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (9)
1. Disaster area environment multi-parameter fusion monitoring and explosion hazard diagnosis system is characterized in that: the device comprises a wide-range composite sampling device, a signal conditioning module, an A/D module and an integrated circuit chip;
the wide-range composite sampling device is provided with a temperature measuring module and an infrared typeCO 2 Gas sensor element, CO 2 Signal conversion and temperature compensation module and infrared CH 4 Gas-sensitive sensor element, CH 4 Signal conversion and temperature compensation module, electrochemical CO gas sensor element and electrochemical H 2 S gas sensor element and electrochemical O 2 A gas-sensitive sensing element; the infrared type CO 2 CO collected by gas-sensitive sensing element 2 Concentration signal by CO 2 Conversion of signal and temperature compensation modules to CO 2 A concentration digital signal; the infrared type CH 4 CH collected by gas-sensitive sensing element 4 Concentration signal by CH 4 Conversion of signal and temperature compensation module into CH 4 A concentration digital signal;
the wide-range composite sampling device is provided with six signal ports; the channel number of the six signal ports is AO1-AO6, which are sequentially used for transmitting temperature digital signals and CO 2 Digital signal of concentration, CH 4 Digital concentration signal, analog concentration signal, H 2 S concentration analog signal and O 2 A concentration analog signal; the CO concentration analog signal, H 2 S concentration analog signal and O 2 The concentration analog signals are transmitted to the signal conditioning module and the A/D module through the signal port;
the signal conditioning module and the A/D module are used for processing and converting the concentration analog signals into digital signals and transmitting the digital signals to the integrated circuit chip; the temperature digital signal and CO 2 Digital concentration signal and CH 4 The concentration digital signal is transmitted to the integrated circuit chip through a signal port;
the integrated circuit chip is provided with a multi-parameter fusion monitor and an explosion hazard diagnostic device;
the multi-parameter fusion monitor comprises a data average value calculation module and a concentration average value calculation module, wherein the data average value calculation module is used for calculating the average value of transmission data in unit time of each signal port, and the real concentration average value of the corresponding average value of the transmission data of the electrochemical gas-sensitive sensor element is calculated through amplification reduction and temperature compensation;
the multi-parameter fusion monitor is also provided with a concentration threshold value and a frequency threshold value, and when the frequency of the combustible gas component concentration average value larger than the concentration threshold value reaches the frequency threshold value, the multi-parameter fusion monitor sends out a first alarm signal;
the multi-parameter fusion monitor also comprises a characteristic quantity calculation module and an explosion concentration limit interval calculation module; the characteristic quantity calculating module is used for calculating fusion judgment characteristic quantity according to the component concentration average value of the combustible gas; the explosion concentration limit interval calculation module is used for calculating the upper and lower limit ranges of the explosion concentration of the combustible gas mixture at the actually measured temperature;
when the fusion judgment characteristic quantity is within the upper limit and the lower limit of the explosion concentration of the combustible gas mixture, the multi-parameter fusion monitor sends out alarm information and drives an explosion hazard diagnostic device;
the explosion hazard diagnostor comprises an explosion triangle analysis module and a measure generation module; the explosion triangle analysis module is used for generating an explosion triangle and calculating and correcting the P coordinate of the mixed gas composition state point; the explosion triangle is divided into a plurality of areas according to the dangerous degree; the measure generating module generates countermeasures according to the region where the mixed gas composition state point P is located in the explosion triangle.
2. The disaster area environment multi-parameter fusion monitoring and explosion hazard diagnosis system according to claim 1, wherein: the data average value calculation module is used for calculating an average value mean (CH) of transmission data in unit time of each signal port, and the formula is as follows:
wherein x is i (CH) is the number of individual data in the channel CH in the channel array DZ (n, 6), n is the number of individual data in the channel CH;
the concentration average value calculation module calculates a true concentration average value mean (CH) of an average value corresponding to transmission data of the electrochemical gas sensor element through amplification reduction and temperature compensation, and the formula is as follows:
where CH is a channel number, f (T) is a temperature curve function of the measured temperature T, f (mean (1)) is a value of the temperature curve function when the measured temperature T is equal to mean (1), and D is a signal magnification.
3. The disaster area environment multi-parameter fusion monitoring and explosion hazard diagnosis system according to claim 1, wherein: the explosion concentration limit interval calculation module comprises a gas explosion concentration calculation module and a mixture explosion concentration calculation module;
the gas explosion concentration calculation module is used for calculating the upper limit N of the explosion concentration of the combustible gas at the measured temperature UT (CH) and lower explosive concentration limit N LT (CH)：
Wherein N is U (CH)、N L (CH) is the upper and lower explosion limits of each combustible gas at 25 ℃;
the mixture explosion concentration calculation module calculates the upper limit N of the explosion concentration of the combustible gas mixture at the measured temperature through weighting treatment Um And a lower limit N Lm ：
4. The disaster area environment multi-parameter fusion monitoring and explosion hazard diagnosis system according to claim 1, wherein: the characteristic quantity calculating module is used for calculating the characteristic quantity of the CH 4 、CO、H 2 And S, accumulating the concentration mean values of the three combustible gas components to obtain a fusion judgment feature quantity M:
5. the disaster area environment multi-parameter fusion monitoring and explosion hazard diagnosis system according to claim 1, wherein: the explosion triangle includes three vertex coordinates, i.e. coordinates of the upper limit point a (X A ，Y A ) Coordinates of the lower limit point B (X B ，Y B ) Coordinates of critical point C (X C ，Y C ) The following formulas were calculated by the explosive triangle synthesis:
wherein (X) A (CH)，Y A (CH)) is the coordinates of the upper limit point A of each flammable gas explosion triangle; (X) B (CH)，Y B (CH)) is the coordinate of the lower limit point B of each flammable gas explosion triangle; CH (CH) 4 、CO、H 2 S three kinds of combustible gas, when each of the combustible gas contains an excessive amount of inert gas component, the coordinates (X C (CH)，Y C (CH)) is calculated as follows:
wherein (X) C (CH) C ，Y C (CH) C ) Is super CO 2 Time CH 4 、CO、H 2 Coordinates of critical point C of each explosion triangle of S three combustible gases, (X) C (CH) N ，Y C (CH) N ) Is more than N 2 Time CH 4 、CO、H 2 S coordinates of critical points C of each explosion triangle of three combustible gases, mean (2) and 3.73mean (6) are respectively two excessive inert gas components CO in the mixed gas 2 And N 2 Concentration of N 2 The component concentration is obtained by adopting an oxygen measurement principle.
6. The disaster area environment multi-parameter fusion monitoring and explosion hazard diagnosis system according to claim 1, wherein: the mixed gas composition state point P coordinate, namely (X) P ，Y P ) Calculated as follows:
7. the disaster area environment multi-parameter fusion monitoring and explosion hazard diagnosis system according to claim 1, wherein: the coordinates of the corrected state point P of the mixed gas composition, i.e. (X) P ’，Y P '), calculated according to the following formula:
wherein, c CH 、d CH 、e CH 、f CH 、c CH ’、d CH ’、e CH ’、f CH ' is CH 4 、CO、H 2 S three combustible gas conversion coefficients, alpha is CO 2 Influence coefficient, beta, on the explosion triangle CH Is O 2 Influence coefficient on P point coordinates, said alpha and beta CH Calculated as follows:
wherein a is CH 、b CH Is CH 4 、CO、H 2 S three combustible gas conversion coefficients.
8. The disaster area environment multi-parameter fusion monitoring and explosion hazard diagnosis system according to claim 1, wherein: the explosion triangle is divided into 4 areas according to the dangerous degree, namely an explosion dangerous area, a wind reduction dangerous area, a wind increase dangerous area and a wind increase and decrease safe area, and the measure generating module generates countermeasures according to the area where the mixed gas composition state point P is located in the explosion triangle.
9. Disaster area environment multi-parameter fusion monitoring and explosion hazard diagnosis device is characterized in that: a disaster area environment multi-parameter fusion monitoring and explosion hazard diagnosis system according to any one of claims 1-8.
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