CN113804839A - Disaster area environment multi-parameter fusion monitoring and explosion risk diagnosis system and device - Google Patents
Disaster area environment multi-parameter fusion monitoring and explosion risk 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 risk diagnosis system and device. The invention adopts the fusion judgment rule of the explosion concentration limit weighting processing to comprehensively present the safety state of the disaster area environment in real time, dynamically constructs a combustible mixed gas synthetic explosion triangle and provides the diagnosis result of the disaster area environment explosion danger by a subarea analysis method. The method effectively extracts complex and variable multi-parameter information with high amplitude in the strong noise environment of the disaster area, and adopts methods of information fusion, combustible 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 risk diagnosis system and device convenient for rescue personnel to carry, which are used for exploring high-concentration toxic and harmful gas accumulation places or closed inerting areas after disaster accidents occur in the fields of coal mines, non-coal mines, dangerous chemicals, oil and gas pipelines and the like.
Background
The complexity and dynamic variability of gas explosion and fire accidents determine the difficulty, danger and technicality of disaster relief, threaten withdrawal and disaster relief work of personnel, and increase the difficulty and danger of disaster relief decision and site rescue. Failure to obtain information about the disaster site quickly and accurately after an accident, e.g. CH4Concentration level, location of trapped or distressed personnel and site temperature, O2And the content of harmful gases such as CO and the like, the on-site collapse condition and the like, thereby delaying the development of rescue work. After gas explosion happens, secondary explosion is very likely to happen, so that the harm to persons in danger is greatly increased, and the requirement of quick rescue forces the rescuers to go deep into the disaster area for detection, but emergency rescueThe rescue team lacks advanced equipment with exquisite technology and reliable performance, and the rescue only can adopt daily production monitoring and hidden danger investigation equipment, so that the dangerous state of an accident scene cannot be effectively judged and predicted, and the life safety of rescue team members is directly threatened. In addition, the fire burning consumes the oxygen in the wind flow, so that the oxygen concentration in the wind flow is reduced, and simultaneously, a large amount of heat energy and H are generated2S, CO and CO2And the toxic and harmful gases and dust, the result of which is that people in the polluted area are burnt, poisoned or suffocated, and even coal dust and gas explosion or coal dust and gas explosion are caused under the coal mine, which causes a greater disaster. In order to guarantee the life safety of rescue workers, disaster detection, personnel search and rescue and communication establishment are carried out by means of a special rescue robot, the robot is suitable for environments where personnel cannot enter and the content of toxic and harmful gases is high, but the existing stage is still in a model prototype test stage, key technical problems such as environmental adaptability, obstacle crossing capability and intelligent degree need to be solved urgently, a certain gap is still left between the robot and practical application, and although the robot is applied to fire fighting and dangerous accidents, no successful case exists in the field of mines with more complex and severe disaster environments.
At present, multi-specification series portable equipment for safety detection of harmful gases in gas leakage, nuclear leakage radiation, electric power and municipal pipelines, iron and steel smelting plant areas and the like in chemical and pharmaceutical workshops is developed at home and abroad, the configuration is very flexible, dozens of combustible or toxic gas sensing elements can be selected, the requirements of high-concentration test of gas components can be met through customization, but only data and threshold value overrun alarm can be visually displayed, and the relevance of multi-parameter information, the safety of environmental states and the like cannot be deeply analyzed on line. In view of the current state of the art and the possibility of technological development in a short period of time, there is a need for continued improvement and improvement of techniques and equipment for rapid detection and analysis of environmental parameters for individual soldiers, particularly for enhancing the adaptability to mine downhole disaster accidents. The existing domestic hand-held mining multi-parameter detecting instrument has a limited measuring range (CH)4The upper limit of concentration measurement is 10% and the upper limit of CO concentration measurement is 1000ppm), and temperature and CO are not substantially contained2Concentration detection function, wherein data are transmitted wirelessly after passing through pneumatic transmitting and sensing elements individuallyReturn mining advanced detection device, CO thereof2The upper limit of concentration measurement is only 20 percent, 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, such as the CO concentration of a high-temperature fire accident site of a mine can reach more than 5000ppm or even 10000ppm, and the CH concentration of a gas accident site4The concentration can be raised to 100%, and the explosion danger of combustible gas can not be analyzed, and the temperature and CH of a few instruments integrated with the gas explosion measuring function4Although the upper limit of CO concentration measurement is increased (the upper limit of temperature measurement is increased to 75 ℃, CH is increased4The upper limit of concentration measurement is increased to 60 percent, and the upper limit of CO concentration measurement is increased to 2000ppm), but the method is still mainly used for normal production inspection and hidden danger inspection, and simultaneously, the method faces the condition that CO cannot be detected2The concentration and gas detection deviation is large, temperature parameters do not participate in gas explosiveness analysis, an effective fusion early warning strategy for mixed gas multi-parameter information and a single gas explosiveness analysis mathematical model are not suitable for combustible mixed gas, necessary dynamic compensation and correction are not carried out on process data, and the like, and the problems are not solved, and high false alarm hidden danger exists. In addition, for the inerting treatment of a closed space, the temperature is easy to gradually decrease to below zero along with the injection of a liquid inert medium, the concentration of the gasified and stabilized medium is easy to gradually increase to 95% along with the increase of the injection amount, the conventional portable mining multi-parameter detection and analysis instrument is not suitable for quantitative determination of the optimal time for injecting and blocking the inert medium and for rapidly constructing, unsealing and removing the sealing device and the like by reserving air holes and periodically sampling and analyzing gas components by a beam tube monitoring means, but the beam tube monitoring operation is complex, the equipment is huge, the upper limit of measurement is low, and the technical problems still need 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 online monitoring of safety state and accurate identification of danger degree based on a disaster area environment multi-parameter signal, further improves the technical applicability and functional diversity of the existing equipment, provides basis for personal protection, closed space entry, scientific rescue scheme making and stage inspection disaster treatment effect and the like, avoids influence on making of the rescue scheme and injury to rescue workers due to unknown environmental information investigation or empirical 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 risk 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 measurement module and infrared CO2Gas sensor element, CO2Signal conversion and temperature compensation module and infrared CH4Gas sensor element, CH4Signal conversion and temperature compensation module, electrochemical CO gas-sensitive sensing element and electrochemical H gas-sensitive sensing element2S gas sensor and electrochemical O2A gas-sensitive sensing element; the infrared CO2CO collected by gas sensor2Concentration signal by CO2Converting signal conversion and temperature compensation module into CO2A concentration digital signal; the infrared type CH4CH collected by gas-sensitive sensor4Concentration signal through CH4Converting signal conversion and temperature compensation module into CH4A concentration digital signal;
the wide-range composite sampling device is internally integrated with a temperature measuring module and infrared and electrochemical gas-sensitive sensing elements capable of collecting natural diffusion type or pump suction type intake samples, and is externally provided with six signal ports; the channel number of the six-channel signal port is AO1-AO6, and the six-channel signal port is sequentially used for transmitting temperature digital signals and CO2Concentration digital signal, CH4Digital signal of concentration, analog signal of CO concentration, H2S concentration analog signal and O2A concentration analog signal; the CO concentration analog signal, H2S concentration analog signal and O2The concentration analog signal is 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 device2S、O2Processing the concentration three-path analog signal to form a voltage signal which has strong interference resistance in a strong noise environment and accords with a digital signal conversion input range; what is needed isThe A/D module is used for reading and converting the concentration analog signals output by the signal conditioning module into binary digital quantity in batch in a grouping collection or continuous collection mode and transmitting the binary digital quantity to the integrated circuit chip; said temperature digital signal, CO2Concentration digital signal and CH4And the concentration digital signal is transmitted to the integrated circuit chip through a signal port.
Furthermore, the integrated circuit chip is provided with a multi-parameter fusion monitor and an explosion risk diagnostor which operate on line in real time. Wherein, the multi-parameter fusion monitor can effectively convert the temperature and the gas component concentration values of each path, and monitors the environmental state by the statistic obtained by respectively calculating the batch data of each path, and uses CH4、CO、H2Method for comparing concentration statistics of S three combustible gas components with safety line threshold value thereof and CH4、CO、H2And S, a method for comparing the sum of the concentration statistics of the three combustible gas components with the explosion concentration limit of a combustible gas mixture is used as a weighted fusion judgment rule to comprehensively evaluate the safety state of the disaster area environment. When the monitoring quantity of the combustible gas components exceeds a set threshold value and reaches a limited number of times, the environment is proved to be in an unsafe state, the multi-parameter fusion monitor gives an alarm, 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 actually measured temperature, the environment is proved to be in an easily explosive state, and the multi-parameter fusion monitor gives an alarm again; after the multi-parameter fusion monitor sends out early warning information, the explosion risk diagnotor is driven to operate, a combustible mixed gas synthetic explosion triangle is drawn through synthesis and normalization processing, and accurate decision is made on whether the explosion conditions are met or not and measures to be taken according to the corrected mixed gas composition state point position and the risk of the region where the mixed gas composition state point position is located;
the multi-parameter fusion monitor comprises a data mean value calculation module and a concentration mean value calculation module, and is used for calculating the mean value of transmission data of each signal port in unit time and calculating the real concentration mean value of the mean value corresponding to the transmission data of the electrochemical gas-sensitive sensing element through magnification reduction and temperature compensation;
the multi-parameter fusion monitor is also provided with a concentration threshold and a frequency threshold, and when the frequency that the concentration mean value of the combustible gas components is greater than the concentration threshold reaches the frequency threshold, the multi-parameter fusion monitor sends 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 calculation module is used for calculating fusion judgment characteristic quantity according to the concentration mean value of the combustible gas components; 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 in the upper and lower limit ranges of the explosion concentration of the combustible gas mixture, the multi-parameter fusion monitor sends alarm information and drives an explosion risk diagnostor;
the explosion risk 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 coordinate of the state point P formed by the mixed gas; the explosion triangle is divided into a plurality of areas according to the danger degree; the measure generation module generates a corresponding measure according to the area of the mixed gas composition state point P in the explosion triangle.
Further, the data mean value calculating module is configured to calculate a mean value mean (ch) of transmission data of each signal port in unit time, and the formula is as follows:
in the formula, xi(CH) is single data in a channel CH in the channel array DZ (n, 6), and n is the number of the single data in the channel CH;
the concentration mean value calculation module is used for calculating the real concentration mean value mean (CH) of the mean value corresponding to the transmission data of the electrochemical gas sensitive sensing element through magnification reduction and temperature compensation, and the formula is as follows:
where CH is the channel number, f (T) is the temperature curve function of the measured temperature T, f (mean (1)) is the value of the temperature curve function when the measured temperature T is equal to mean (1), and D is the 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 temperatureUT(CH) and lower explosive concentration limit NLT(CH)：
In the formula, NU(CH)、NL(CH) represents 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 processingUmAnd a lower limit of NLm：
Further, the characteristic quantity calculation module is used for calculating the characteristic quantity of the channel by matching CH4、CO、H2And (S) accumulating the concentration mean values of the three combustible gas components to obtain fusion judgment characteristic quantity M:
further, the explosion triangle includes coordinates of three vertices, i.e., coordinates (X) of upper limit point AA，YA) Coordinate (X) of lower limit point BB，YB) C, the coordinate (X) of the critical point CC，YC) The following formula is calculated by the explosion triangle synthesis method:
in the formula (X)A(CH)，YA(CH)) is the coordinate of the upper limit point A of each combustible gas explosion triangle; (X)B(CH)，YB(CH)) is the coordinate of the lower limit point B of each flammable gas explosion triangle; CH (CH)4、CO、H2S coordinates (X) of critical point C of each explosion triangle when the three combustible gases respectively contain excessive inert gas componentsC(CH)，YC(CH)), calculated as:
in the formula (X)C(CH)C，YC(CH)C) Is super CO2Time CH4、CO、H2S coordinates of critical point C of each explosion triangle of three combustible gases, (X)C(CH)N，YC(CH)N) Is in excess of N2Time CH4、CO、H2S the coordinates of each explosion triangle critical point C of the three combustible gases, mean (2) and 3.73mean (6) are respectively mixedTwo excessive inert gas components CO in gas2And N2Concentration of (A), N2The component concentration is obtained by adopting an oxygen measuring principle.
Further, the mixed gas composition state point P coordinate, i.e., (X)P，YP) Calculated as follows:
further, the mixed gas composition state point P is corrected to have a coordinate of (X)P’，YP'), calculated as:
in the formula, cCH、dCH、eCH、fCH、cCH’、dCH’、eCH’、fCH' is CH4、CO、H2Conversion coefficient of S three combustible gases, alpha is CO2Coefficient of influence on the explosion triangle, betaCHIs O2Coefficient of influence on the coordinates of the P points, said alpha and betaCHCalculated as follows:
in the formula, aCH、bCHIs CH4、CO、H2And S, conversion coefficients of the three combustible gases.
Further, the explosion triangle is divided into 4 areas according to the risk degree, namely an explosion risk area, a wind reduction risk area, a wind increasing risk area and a wind increasing and decreasing safety area, and the measure generation module generates the corresponding measures according to the area of the mixed gas composition state point P in the explosion triangle.
The disaster area environment multi-parameter fusion monitoring and explosion risk diagnosis device adopts any one of the disaster area environment multi-parameter fusion monitoring and explosion risk diagnosis systems.
The invention has the beneficial effects that:
1. the invention converts CH into4、CO、H2S three main combustible gas components in disaster area and O closely related to combustion explosion2And the common inert medium CO2Environmental characterization and CO injection as the object to be tested and in the main field of application2The process technology for inerting the hazardous area is consistent.
2. The invention selects infrared and electrochemical gas-sensitive sensing elements according to the physicochemical characteristics of the components of the gas to be detected and the current technical situation of the existing gas-sensitive sensing, and presents an implementation way for multi-parameter signal acquisition, processing and transmission.
3. The invention sets the safety threshold of each combustible gas component, such as CH used in coal mine4The concentration should not exceed 1.5% of the threshold value, and the CO concentration should not exceed 24PPm of the threshold value, so as to avoid the threat of gas explosion, fire accident and secondary accident.
4. The invention introduces a digital temperature signal detection function, can intuitively and quantitatively reflect the high and low temperature characteristics of a complex environment in the processes of fire accident site detection, dangerous area inerting effect evaluation 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 explosive concentration of combustible gas.
5. The invention takes the mean value of the data collected and read by the corresponding channels of each sensing element as the effective value for displaying and analyzing, and takes the times of the concentration mean value of the combustible gas exceeding the threshold value as the macroscopic judgment basis of whether the environmental state is safe or not and the triggering condition of the 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 explosion concentration limit of a mixture containing multiple combustible gas components along with the change of temperature is obtained by weighting the explosion concentration limit of each single combustible gas and is used as the standard of the explosion risk fusion judgment rule of the mixed gas, the sum of the concentration mean values of the combustible gas components is used as the characteristic quantity of the explosion risk fusion judgment of the mixed gas, the two components are compared and analyzed in real time, when the former is positioned in the range of the upper limit and the lower limit of the latter, the explosion possibility exists, and a second alarm prompt is triggered immediately.
7. On the basis of the existing single combustible gas explosion triangle, the invention expands the online construction method for forming a mixture synthetic explosion triangle containing multiple combustible gas components, integrates a coordinate correction algorithm of gas composition state points and a safety state partition theory of mixed gas, can accurately diagnose the explosion danger degree of the mixed gas by positioning the coordinate in the area where the mixed gas synthesizes the explosion triangle, can trigger a third alarm prompt when the mixed gas composition state points are positioned in the explosion danger area, and simultaneously gives technical guidance on how to safely deal with.
Drawings
Fig. 1 is a system composition diagram of the disaster area environment multi-parameter fusion monitoring and explosion risk 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 risk diagnoser of the present invention.
Detailed Description
The following is further detailed by way of specific embodiments:
the specific implementation process is as follows:
example one
In the first embodiment, as shown in fig. 1, the disaster area environment multi-parameter fusion monitoring and explosion risk diagnosis system includes a wide-range composite sampling device, a signal conditioning module, an a/D module, and an integrated circuit chip.
The large-range composite sampling device is internally integrated with a temperature measurement module capable of detecting (-40-125) DEG C and an infrared CO (carbon monoxide) type capable of detecting (0-100)% VOL2Gas sensor element and CO2Signal conversion and temperature compensation module, infrared CH capable of detecting (0-100)% VOL4Gas sensor element and CH4A signal conversion and temperature compensation module, an electrochemical CO gas-sensitive sensing element capable of detecting (0-9999) ppm, and an electrochemical sensor capable of detecting (0-500) ppmLearning formula H2S gas sensitive sensor and electrochemical O capable of detecting (0-30)% VOL2A gas sensor element.
The wide-range composite sampling device is externally provided with six signal ports of AO1-AO6, wherein the first signal port AO1 outputs temperature digital signals, and the second signal port AO2 and the third signal port AO3 respectively output CO2、CH4The fourth, fifth and sixth signal ports AO4, AO5 and AO6 output CO and H, respectively2S、O2A concentration analog signal; the fourth, fifth and sixth signal ports AO4, AO5 and AO6 output CO and H2S、O2The concentration analog signals are transmitted to the signal conditioning module, and are respectively accessed to the A/D module for analog-to-digital conversion after being processed by current-voltage conversion, filtering, amplification and the like to uniformly output voltage signals; CO and H output by the A/D module2S、O2The concentration digital signal, the temperature digital signal output by the first path signal port AO1 and the CO output by the second path signal port AO2 and the third path signal port AO3 respectively2、CH4The concentration digital signals are transmitted to the integrated circuit chip through a serial bus; and a multi-parameter fusion monitor and an explosion risk diagnostor which operate on line in real time are arranged in the integrated circuit chip.
The multi-parameter fusion monitor comprises a data mean value calculation module and a concentration mean value calculation module, and is used for calculating the mean value of transmission data of each signal port in unit time and calculating the real concentration mean value of the mean value corresponding to the transmission data of the electrochemical gas-sensitive sensing element through magnification reduction and temperature compensation;
the multi-parameter fusion monitor is further provided with a concentration threshold and a frequency threshold, wherein the frequency threshold in the embodiment is 5 times, and when the frequency that the concentration mean value of the combustible gas components is greater than the concentration threshold reaches the frequency threshold, 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 calculation module is used for calculating fusion judgment characteristic quantity according to the concentration mean value of the combustible gas components; 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 in the upper and lower limit ranges of the explosion concentration of the combustible gas mixture, the multi-parameter fusion monitor sends alarm information and drives an explosion risk diagnostor;
the explosion risk 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 coordinate of the state point P formed by the mixed gas; the explosion triangle is divided into a plurality of areas according to the danger degree; the measure generation module generates a corresponding measure according to the area of the mixed gas composition state point P in the explosion triangle.
As shown in fig. 2, in this embodiment, after the acquired 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 times G (CH) to 0;
specifically, the channel number CH has a value of 1-6, and respectively corresponds to temperature data and CO2Concentration data, CH4Concentration data, CO concentration data, H2S concentration data, O2Concentration data.
Step 102: reading data in batches;
step 103: establishing channel data DZ (n, 6) after carrying out system conversion and unit conversion;
specifically, in the channel array DZ (n, 6), the serial number of each row is the channel number CH, which is 6 rows in total, the maximum row number n is the total number of data that can be accommodated by any channel, such as 512, 1024, 2048 …, and the data corresponding to each adjacent row number in any channel are acquired at equal time intervals.
Step 104: calculating the mean value mean (CH) of data in the channel;
specifically, the data mean calculation module performs mean processing on n data in the channel according to the channel number CH to obtain a data mean (CH), and calculates according to the following formula:
in the formula, xi(CH) is the individual data within the channel CH in the channel array DZ (n, 6).
Step 105: judging whether the channel number CH is equal to 4-6, if so, calculating a true concentration mean value mean (CH) by mean (CH) magnification reduction and temperature compensation, and then entering step 106; if the channel number CH is not equal to 4-6, directly entering step 106;
specifically, the concentration mean value calculation module is based on electrochemistry CO and H2S、O2The method is characterized in that the signal measured by the gas sensitive sensor element is subjected to numerical value reduction, zero point and range correction according to the principle that the amplification of a fixed coefficient and the signal ratio of a temperature curve are approximately in a linear relation, and the real gas component concentration mean value mean (CH) is obtained after treatment, and the formula is as follows:
in the formula, CH is a channel number, f (T) is a temperature curve function of the measured temperature T, i.e. a signal ratio, which is obtained by operation approximation by using a curve fitting method, the fitting adopts the most common 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 value R (CH) and then entering step 107; if the channel number CH is not equal to 3-5, adding 1 to the channel number CH, and then returning to the step 104;
step 107: judging whether the concentration mean (CH) of the combustible gas components is greater than a concentration threshold value R (CH), if so, adding 1 to the number G (CH) of overrun, and then entering the step 108; if the combustible gas component concentration mean (CH) is less than or equal to the concentration threshold R (CH), proceed directly to step 109;
step 108: judging whether the number of times G (CH) of overrun reaches a number threshold value, if the number of times G (CH) of overrun reaches the number threshold value, generating a first alarm signal, and clearing the number of times G (CH) of overrun; if the number of times of overrun G (CH) does not reach the number threshold, directly entering step 109;
step 109: calculating the upper limit N of the explosive concentration of the combustible gas at the measured temperatureUT(CH) and lower explosive concentration limit NLT(CH)；
Step 110: judging whether the channel number CH is equal to 6, if so, firstly calculating the upper limit N of the explosive concentration of the combustible gas mixture at the measured temperatureUmAnd a lower limit of NLmThen, go to step 111; if the channel number CH is not equal to 6, adding 1 to the channel number CH, and then returning to the 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 gas explosion concentration calculation module is used for calculating the upper limit N of the explosion concentration of the combustible gas at the measured temperatureUT(CH) and lower explosive concentration limit NLT(CH)：
In the formula, NU(CH)、NL(CH) represents the upper and lower explosion limits of each combustible gas at 25 ℃;
the mixture explosive concentration calculation module calculates the upper limit N of the explosive concentration of the combustible gas mixture at the measured temperature through weighting processingUmAnd a lower limit of NLm：
Step 111: calculating fusion judgment characteristic quantity M;
specifically, the characteristic quantity calculation module is used for calculating the channel quality by the channel pair CH4、CO、H2And (S) accumulating the concentration mean values of the three combustible gas components to obtain fusion judgment characteristic quantity M:
step 112: judging whether the fusion judgment characteristic quantity M is at the upper limit N of the explosive concentration of the combustible gas mixture at the actual measurement temperatureUmAnd a lower limit of NLmIf the fusion judgment characteristic quantity M is at the upper limit N of the explosive concentration of the combustible gas mixture at the measured temperatureUmAnd a lower limit of NLmIf so, generating a second alarm signal, starting explosion risk diagnosis, and then entering step 113; otherwise, go to step 113 directly;
step 113: setting the channel number CH to 1, and returning to step 102.
In this embodiment, the explosion risk diagnosis process is implemented by an explosion risk diagnoser as shown in fig. 3, and includes the following steps:
step 201: calculating three-vertex coordinates of the explosion triangle synthesized by the mixed gas;
in particular, the explosion triangle includes the coordinates of three vertices, i.e. the coordinates (X) of the upper limit point aA，YA) Coordinate (X) of lower limit point BB，YB) C, the coordinate (X) of the critical point CC，YC) The following formula is calculated by the explosion triangle synthesis method:
in the formula (X)A(CH)，YA(CH)) is the coordinate of the upper limit point A of each combustible gas explosion triangle; (X)B(CH)，YB(CH)) is the coordinate of the lower limit point B of each flammable gas explosion triangle; CH (CH)4、CO、H2S coordinates (X) of critical point C of each explosion triangle when the three combustible gases respectively contain excessive inert gas componentsC(CH)，YC(CH)), calculated as:
in the formula (X)C(CH)C，YC(CH)C) Is super CO2Time CH4、CO、H2S coordinates of critical point C of each explosion triangle of three combustible gases, (X)C(CH)N，YC(CH)N) Is in excess of N2Time CH4、CO、H2S coordinates of explosion triangular critical points C of three combustible gases, mean (2) and 3.73mean (6) are respectively two excessive inert gas components CO in the mixed gas2And N2Concentration of (A), N2The component concentration is obtained by adopting an oxygen measuring principle.
Step 202: calculating the coordinate of the mixed gas composition state point P;
specifically, the mixed gas composition state point P coordinate, namely (X)P，YP) Calculated as follows:
step 203: correcting the coordinate of the point P;
specifically, the coordinate of the mixed gas composition state point P after correction,that is (X)P’，YP') calculated by the explosion triangle normalization method as follows:
in the formula, cCH、dCH、eCH、fCH、cCH’、dCH’、eCH’、fCH' is CH4、CO、H2Conversion coefficient of S three combustible gases, alpha is CO2Coefficient of influence on the explosion triangle, betaCHIs O2Coefficient of influence on the coordinates of the P points, said alpha and betaCHCalculated as follows:
in the formula, aCH、bCHIs CH4、CO、H2And S, conversion coefficients of the three combustible gases.
Step 204: drawing a mixed gas synthetic explosion triangle graph and a point P;
step 205: judging whether the point P is located in an explosion danger area (namely an area I), if the point P is located in the explosion danger area (namely the area I), generating a third alarm signal, prompting that the explosion danger exists and the danger is to be evacuated quickly, and then entering the 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 located in a risk area (namely a zone II) for reducing the wind, if the point P is located in the risk area (namely the zone II), prompting that the wind quantity is to be increased properly, and then entering the step 210; if the point P is not located in the risk reduction zone (i.e. zone II), go to step 207;
step 207: judging whether the point P is located in a risk increasing area (namely a III area), if so, prompting that the air volume is properly reduced, and then entering step 210; if the point P is not located in the risk-increasing zone (i.e., zone III), go to step 208;
step 208: determining that the point P is located in an air increase and decrease safety zone (namely an IV zone);
step 209: no danger exists in prompting the increase and decrease of the air volume;
step 210: the explosion risk diagnosis is ended.
Example two
The second embodiment is different from the first embodiment only in that the disaster area environment multi-parameter fusion monitoring and explosion risk diagnosis device in the second embodiment adopts the disaster area multi-parameter fusion monitoring and explosion risk diagnosis system.
The foregoing is merely an example of the present invention, and common general knowledge in the field of known specific structures and characteristics of the embodiments is not described herein in any greater extent than that known to persons of ordinary skill in the art at the filing date or priority date of the present application, so that all of the prior art in this field can be known and can be applied with the ability of conventional experimental means before this date.
It should be noted that, for those skilled in the art, changes and modifications can be made without departing from the structure of the invention, and therefore, the following changes and modifications which do not affect the substance of this patent are also intended to be covered by the scope of the appended claims: the integrated circuit chip is mainly a single chip microcomputer, 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 other dispersed modules are integrated through a mainboard; for detecting output CO2、CH4The infrared gas-sensitive sensing element of the concentration digital signal and the matched signal conversion and temperature compensation module thereof can be in a split combination type as described in the patent, and can also be a double-parameter integrated detection output device integrating the functions of signal conversion and temperature compensation; CO and H output by A/D module2S、O2Concentration digital signal and first channel signalThe temperature digital signal output by the signal port and the CO output by the second and the third signal ports respectively2、CH4The concentration digital signal is transmitted to the integrated circuit chip of the patent through the serial bus of the patent, such as RS232, RS485, etc., and other communication modes, such as USB bus, etc., may also be adopted, which should be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. Disaster area environment multi-parameter fusion monitoring and explosion risk diagnosis system, its characterized in that: the 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 measurement module and infrared CO2Gas sensor element, CO2Signal conversion and temperature compensation module and infrared CH4Gas sensor element, CH4Signal conversion and temperature compensation module, electrochemical CO gas-sensitive sensing element and electrochemical H gas-sensitive sensing element2S gas sensor and electrochemical O2A gas-sensitive sensing element; the infrared CO2CO collected by gas sensor2Concentration signal by CO2Converting signal conversion and temperature compensation module into CO2A concentration digital signal; the infrared type CH4CH collected by gas-sensitive sensor4Concentration signal through CH4Converting signal conversion and temperature compensation module into CH4A concentration digital signal;
the wide-range composite sampling device is provided with six signal ports; the channel number of the six-channel signal port is AO1-AO6, and the six-channel signal port is sequentially used for transmitting temperature digital signals and CO2Concentration digital signal, CH4Digital signal of concentration, analog signal of CO concentration, H2S concentration analog signal and O2A concentration analog signal; the CO concentration analog signal, H2S concentration analog signal and O2Concentration analog signal passing signal terminalThe port is transmitted to the signal conditioning module and the A/D module;
the signal conditioning module and the A/D module are used for processing the concentration analog signal, converting the concentration analog signal into a digital signal and transmitting the digital signal to the integrated circuit chip; said temperature digital signal, CO2Concentration digital signal and CH4And the concentration digital signal is transmitted to the integrated circuit chip through a signal port.
2. The disaster area environment multi-parameter fusion monitoring and explosion risk diagnosis system according to claim 1, wherein: the integrated circuit chip is provided with a multi-parameter fusion monitor and an explosion risk diagnostor;
the multi-parameter fusion monitor comprises a data mean value calculation module and a concentration mean value calculation module, and is used for calculating the mean value of transmission data of each signal port in unit time and calculating the real concentration mean value of the mean value corresponding to the transmission data of the electrochemical gas-sensitive sensing element through magnification reduction and temperature compensation;
the multi-parameter fusion monitor is also provided with a concentration threshold and a frequency threshold, and when the frequency that the concentration mean value of the combustible gas components is greater than the concentration threshold reaches the frequency threshold, the multi-parameter fusion monitor sends 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 calculation module is used for calculating fusion judgment characteristic quantity according to the concentration mean value of the combustible gas components; 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 in the upper and lower limit ranges of the explosion concentration of the combustible gas mixture, the multi-parameter fusion monitor sends alarm information and drives an explosion risk diagnostor;
the explosion risk 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 coordinate of the state point P formed by the mixed gas; the explosion triangle is divided into a plurality of areas according to the danger degree; the measure generation module generates a corresponding measure according to the area of the mixed gas composition state point P in the explosion triangle.
3. The disaster area environment multi-parameter fusion monitoring and explosion risk diagnosis system according to claim 2, wherein: the data mean value calculating module is used for calculating a mean value mean (CH) of transmission data of each signal port in unit time, and the formula is as follows:
in the formula, xi(CH) is single data in a channel CH in the channel array DZ (n, 6), and n is the number of the single data in the channel CH;
the concentration mean value calculation module calculates the real concentration mean value mean (CH) of the mean value corresponding to the transmission data of the electrochemical gas sensitive sensing element through magnification reduction and temperature compensation, and the formula is as follows:
where CH is the channel number, f (T) is the temperature curve function of the measured temperature T, f (mean (1)) is the value of the temperature curve function when the measured temperature T is equal to mean (1), and D is the signal magnification.
4. The disaster area environment multi-parameter fusion monitoring and explosion risk diagnosis system according to claim 2, 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 temperatureUT(CH) and lower explosive concentration limit NLT(CH)：
In the formula, NU(CH)、NL(CH) represents 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 processingUmAnd a lower limit of NLm：
5. The disaster area environment multi-parameter fusion monitoring and explosion risk diagnosis system according to claim 2, wherein: the characteristic quantity calculation module is used for passing through the pair CH4、CO、H2And (S) accumulating the concentration mean values of the three combustible gas components to obtain fusion judgment characteristic quantity M:
6. the disaster area environment multi-parameter fusion monitoring and explosion risk diagnosis system according to claim 2, wherein: the explosion triangle includes the coordinates of three vertices, i.e., the coordinate (X) of the upper limit point AA，YA) Coordinate (X) of lower limit point BB，YB) C, the coordinate (X) of the critical point CC，YC) The following formula is calculated by the explosion triangle synthesis method:
in the formula (X)A(CH)，YA(CH)) is the coordinate of the upper limit point A of each combustible gas explosion triangle; (X)B(CH)，YB(CH)) is the coordinate of the lower limit point B of each flammable gas explosion triangle; CH (CH)4、CO、H2S coordinates (X) of critical point C of each explosion triangle when the three combustible gases respectively contain excessive inert gas componentsC(CH)，YC(CH)), calculated as:
in the formula (X)C(CH)C，YC(CH)C) Is super CO2Time CH4、CO、H2S coordinates of critical point C of each explosion triangle of three combustible gases, (X)C(CH)N，YC(CH)N) Is in excess of N2Time CH4、CO、H2S coordinates of explosion triangular critical points C of three combustible gases, mean (2) and 3.73mean (6) are respectively two excessive inert gas components CO in the mixed gas2And N2Concentration of (A), N2The component concentration is obtained by adopting an oxygen measuring principle.
7. The disaster area environment multi-parameter fusion of claim 2Monitoring and explosion risk diagnostic system characterized by: the mixed gas composition state point P coordinate, i.e. (X)P，YP) Calculated as follows:
8. the disaster area environment multi-parameter fusion monitoring and explosion risk diagnosis system of claim 3, wherein: the corrected coordinates of the mixed gas composition state point P, i.e. (X)P’，YP'), calculated as:
in the formula, cCH、dCH、eCH、fCH、cCH’、dCH’、eCH’、fCH' is CH4、CO、H2Conversion coefficient of S three combustible gases, alpha is CO2Coefficient of influence on the explosion triangle, betaCHIs O2Coefficient of influence on the coordinates of the P points, said alpha and betaCHCalculated as follows:
in the formula, aCH、bCHIs CH4、CO、H2And S, conversion coefficients of the three combustible gases.
9. The disaster area environment multi-parameter fusion monitoring and explosion risk diagnosis system according to claim 2, wherein: 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 increasing danger area and a wind increasing and decreasing safety area, and the measure generation module generates the corresponding measures according to the area where the mixed gas composition state point P is located in the explosion triangle.
10. Disaster area environment multi-parameter fusion monitoring and explosion danger diagnostic device, its characterized in that: any one of the disaster area environment multi-parameter fusion monitoring and explosion risk diagnosis systems is adopted.
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