A device for detecting toxic gases in an explosive environment

Abstract

A detection device for toxic gases in explosion environment, the detection device comprising: a box; the box comprising a box cover and a box body; the front of the box body is provided with a vertical plate; the inner side of the vertical plate is provided with a probe mounting plate; the probe mounting plate is provided with a plurality of first through holes and sensor probes mounted in the first through holes; the vertical plate is provided with a fourth through hole corresponding to each of the sensor probes; the shock wave surface of the sensor probe faces the fourth through hole of the vertical plate; a pipe body is arranged in communication with the fourth through hole outside the vertical plate of the box body; a sensor and a data recorder are arranged in the box body; the sensor and the data recorder are communicatively connected, the sensor transmits gas data information to the data recorder; the sensor and the sensor probe are communicatively connected. The box structure and its support system adopt an anti-impact overpressure design to meet the detection requirements in an explosion environment below 3MPA.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of detection, and particularly relates to a detection device for toxic gases in an explosion environment. BACKGROUND

[0002] Toxic and harmful gases refer to toxic and harmful gases in gaseous state or extremely volatile toxic chemicals at normal temperature and pressure, which have stimulating effects on respiratory tracts and are easy to be inhaled to cause poisoning, including ammonia, ozone, nitrogen dioxide, sulfur dioxide, carbon monoxide, hydrogen sulfide and photochemical smog. Toxic agents and harmful substances in the field of protective engineering include sarin, carbon monoxide, carbon dioxide, formaldehyde, ammonia, benzene, radon, dichlorodifluoromethane, volatile organic compounds, inhalable particulate matter, bacteria and microorganisms, etc.

[0003] Because of the great toxic effect of gases such as sarin and radon, professional departments need to conduct research. Oxygen is not a toxic gas, but it is directly related to the survival of living beings. The gases detected in the design are controlled in oxygen, carbon monoxide, carbon dioxide, sulfur dioxide, nitrogen dioxide, ammonia, hydrogen sulfide, ozone and benzene.

[0004] Common toxic and harmful gases can be divided into stimulating gases and suffocating gases according to their toxic properties. Stimulating gases refer to gases that have stimulating effects on the eyes and respiratory mucosa. It is a toxic gas commonly encountered in the chemical industry. There are many types of stimulating gases, and the common ones are chlorine, ammonia, nitrogen oxides, phosgene, hydrogen fluoride, sulfur dioxide, sulfur trioxide and dimethyl sulfate, etc. Suffocating gases refer to toxic gases that can cause hypoxia in the body. Suffocating gases can be divided into simple suffocating gases, blood suffocating gases and cell suffocating gases. For example, nitrogen, methane, ethane, ethylene, carbon monoxide, nitrobenzene vapor, hydrogen cyanide, hydrogen sulfide, etc. Among these gases, the toxic gases are mainly carbon monoxide, ammonia, sulfur dioxide, chlorine, hydrogen sulfide and benzene. The so-called "three harmful gases" are carbon monoxide, sulfur dioxide and nitrogen dioxide, respectively.

[0005] The research on civil toxic gases and their action rules mainly focuses on mining industry, medical treatment, agriculture, construction industry, etc. The detection technology research is relatively mature in China, including gas chromatography-ion mobility spectrometry combined method, NASICON material method, toxic gas concentration detection method based on gas sensor and random forest, FTIR absorption spectrum analysis of typical toxic gases, on-site rapid chromatographic separation, etc. The main detection method standards for civil toxic gases are shown in Table 1.

[0006] Table 1 Main detection method standards for civil toxic gases

[0007]

[0008]

[0009] The protection problem of toxic gas in the detonation gas is one of the important contents of the engineering protection research field, and the action law of the toxic gas generated by the explosion is an important prerequisite for the protection technology research. At present, the action law of the gas is mainly realized by simulation method, and the related computational fluid dynamics calculation software is relatively mature, but the detection technology problem of the toxic gas in the detonation gas under the explosion environment has not been well solved.

[0010] The prior art has the following defects and deficiencies: the civil toxic gas detection method is relatively mature, the air environment quality detection demand under the normal temperature and pressure environment condition is basically realized, the disadvantage is that it cannot withstand the high temperature and high pressure condition of the shock wave explosion environment. The shock wave explosion environment gas content detection mainly adopts the sampling retention method, the advantage is that the gas composition can be accurately determined, the disadvantage is that the sampling tube distance is long, the gas collection is passive, and the sampling time period and the gas collection amount cannot be accurately controlled. Therefore, it is necessary to develop a device for detecting toxic gas in an explosion environment. SUMMARY

[0011] The present application provides a kind of detection device of toxic gas in explosion environment, with simple structure, convenient operation, solve the problem of existing detection device to explosion shock wave cannot withstand and the inaccurate data of sampling.

[0012] To achieve the above object, the present application provides the following technical scheme:

[0013] A kind of detection device of toxic gas in explosion environment, the detection device includes: box;The box includes box cover and box main body;The front of the box main body is provided with vertical plate;The inner side of the vertical plate is provided with probe mounting plate;The probe mounting plate is provided with a plurality of first through holes and sensor probe mounted in the first through hole;The vertical plate is provided with the fourth through hole corresponding to each sensor probe;The impact wave surface of the sensor probe faces the fourth through hole of the vertical plate;Pipe body is provided with the fourth through hole in communication outside the vertical plate of the box main body;Sensor, data logger are arranged in the box main body;The sensor and the data logger are connected in communication, the sensor transmits gas data information to the data logger;The sensor and the sensor probe are connected in communication.

[0014] Further, the box is provided with rubber pad;The rubber pad is arranged between the probe mounting plate and the vertical plate, and is attached to the vertical plate;The rubber pad is provided with second through hole at the position corresponding to each sensor probe;The first through hole is in communication with the second through hole, the fourth through hole and the pipe body.

[0015] Further, one end of the sensor probe is close to the second through hole of the rubber pad.

[0016] Further, one end of the sensor probe passes through the second through hole of the rubber pad and enters the pipe body.

[0017] Further, a back plate hole is arranged on the back plate of the box body at a position corresponding to the first through hole.

[0018] Further, the diameter of the back plate hole is smaller than the diameter of the first through hole.

[0019] Further, the left and right ends of the probe mounting plate are provided with support plates, and the probe mounting plate is fixedly connected with the two side surfaces of the box body through the support plates.

[0020] Further, the detection device comprises a support system; the support system comprises a foot plate, a first mounting rod and a second mounting rod; the foot plate is horizontally arranged on the ground, the lower end of the foot plate is fixedly connected with the ground in a threaded manner, and the upper end of the foot plate is fixedly connected with the first mounting rod; the upper end of the first mounting rod is fixedly connected with the bottom surface of the box body, and the lower end is fixedly connected with the foot plate; the second mounting rod is horizontally arranged at the middle part of the first mounting rod; the second mounting rod is circumferentially connected with the first mounting rod.

[0021] Further, the box body is open upward, the shape of the box cover corresponds to the shape of the opening of the box body, the box cover and the box body are connected in a threaded manner, a zinc back plate is arranged on the bottom surface of the box body, a storage battery, a sensor and a data recorder are arranged on the zinc back plate, the storage battery is electrically connected with the sensor and the data recorder, the storage battery provides power for the sensor and the data recorder, and the sensor, the data recorder, the storage battery and the zinc back plate are connected in a threaded manner.

[0022] The technical scheme of the present application has the following beneficial effects:

[0023] The box body structure and the support system thereof adopt an anti-impact and overpressure design, meet the detection requirements in an explosion environment below 3MPA, adopt a lateral flow guiding and sampling layout design to avoid damage of the shock wave and internal equipment, adopt real-time recording to realize safe storage of data, have multiple triggering modes to realize on-demand storage of data, have a data processing and effect evaluation function to improve the analysis efficiency of researchers, and have a self-provided power supply without the need of external power supply. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 FIG. 1 is a structural schematic view of the detection device for toxic and harmful gases in an explosion environment according to the present application;

[0025] Figure 2 FIG. 3 is a simulation calculation model schematic view of the sampling fluid of the detection device for toxic and harmful gases in an explosion environment according to the present application;

[0026] Figure 3 Time history curve of model inlet velocity of the detection device for toxic gas in explosive environment of the application;

[0027] Figure 4 Comparison chart of time history curves of pressure and velocity of the detection device for toxic gas in explosive environment at 0° working condition, on the shock wave surface, in the sampling tube and inside the detection device;

[0028] Figure 5 Comparison chart of time history curves of pressure and velocity of the detection device for toxic gas in explosive environment at 15° working condition, on the shock wave surface, in the sampling tube and inside the detection device;

[0029] Figure 6 Time history curve of pressure and velocity of a random point outside the shock wave surface and the point with maximum pressure on the surface at 0° working condition of the detection device for toxic gas in explosive environment of the application;

[0030] Figure 7 Time history curve of pressure and velocity of a random point outside the shock wave surface and the point with maximum pressure on the surface at 15° working condition of the detection device for toxic gas in explosive environment of the application;

[0031] Figure 8 Positional schematic diagram of the detection device for toxic gas in explosive environment of the application in one specific embodiment;

[0032] Figure 9 Time history curve of gas content collected in the test of the detection device for toxic gas in explosive environment of the application;

[0033] Figure 10 Time history curves of sulfur dioxide gas content under two filtering methods collected in the test of the detection device for toxic gas in explosive environment of the application;

[0034] Figure 11 Time history curves of sulfur dioxide gas content before and after extreme value filtering of the detection device for toxic gas in explosive environment of the application;

[0035] Figure 12 Top view of one embodiment of the detection device for toxic gas in explosive environment of the application;

[0036] Figure 13 Top view of another embodiment of the detection device for toxic gas in explosive environment of the application.

[0037] The standard illustration of the drawing: the ground plate 1, the first installation pole 2, the second installation pole 3, the box 5, the sensor probe 6, the rubber pad 10, the sensor 11, the zinc locking back plate 12, the data recorder 13, the box cover 14, the battery 15, the locking nut 16, the probe installation plate 17, the support plate 18, the vertical plate 50, the pipe body 100, the back plate hole 101. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0039] In the description of the present application, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0040] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "connection" and the like should be broadly understood, for example, "connection" can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] Referring to the drawings Figure 1 The detection device for toxic gases in an explosive environment provided by the present application meets the detection requirements of an explosive environment below 3MPA. The detection device will be described in detail below. The detection device comprises: a ground plate 1, a first installation pole 2, a second installation pole 3, a box 5, a sensor probe 6, a rubber pad 10, a sensor 11, a zinc locking back plate 12, a data recorder 13, a box cover 14, a battery 15, a locking nut 16, a probe installation plate 17, a support plate 18, a vertical plate 50, a pipe body 100, and a back plate hole 101.

[0042] We start from the box 5 and introduce the detection device in detail:

[0043] The detection device comprises a box body 5. The box body 5 is welded by steel plates.

[0044] The box body 5 comprises a box main body and a box cover 14 covering the opening of the box main body. The shape of the box cover 14 can be square, rectangular, circular or oval, and the specific shape is matched with the opening of the box main body. The opening of the box main body is upward, and the box cover 14 and the box main body are fixedly connected in a threaded manner.

[0045] The bottom surface of the box main body is square (of course, it can also be rectangular, circular or oval), the front surface (i.e. the surface facing the readers) of the box main body is rectangular, and the front surface of the box main body is provided with a probe mounting plate 17; the two side surfaces and the back plate of the box main body are in a transverse U-shaped groove plate structure, and the U-shaped opening is inward (inward is the center side of the box body 5), and the bottom surface of the U-shaped groove plate structure is rectangular. Figure 1

[0046] Now we will introduce the three key components in detail: the vertical plate 50, the probe mounting plate 17 and the rubber pad 10.

[0047] The front surface of the box main body is provided with a vertical plate 50, and the vertical plate 50 is in a rectangular structure. The positional relationship among the vertical plate 50, the probe mounting plate 17 and the rubber pad 10 is that the vertical plate 50 is at the outermost side (inward is close to the center of the detection device, and outward is far away from the center of the detection device), the probe mounting plate 17 is at the innermost side, and the rubber pad 10 is in the middle of the vertical plate 50 and the probe mounting plate 17 and is attached to the vertical plate 50. The vertical plate 50 is provided with a fourth through hole at the position corresponding to the sensor probe 6, and a pipe body 100 is arranged outside the vertical plate 50 of the box main body and in communication with the fourth through hole. As the pipe body 100, a metal pipe, an alloy pipe or a ceramic pipe with certain strength can be used, and a steel pipe is preferred. The preferred pipe body 100 is welded with the fourth through hole.

[0048] ​The inner side of the vertical plate 50 (close to the center of the detection device is inside, and far from the center of the detection device is outside) is provided with a probe mounting plate 17, which is a hard flat structure. It can be a simple metal plate, a composite plate (such as a plate with a honeycomb sandwich structure), or a wooden plate. It can also be a profiled member with reinforcing ribs and other structures. The probe mounting plate 17 has support plates 18 at its left and right ends in the vertical state, which are fixedly connected to the two side surfaces of the box body by using internal hexagonal cylindrical screws. The probe mounting plate 17 is provided with a plurality of first through holes and sensor probes 6 mounted in the first through holes, which are circular hole structures. The sensor probe 6 is a tubular structure with a maximum outer diameter of 29.7 mm and a length of 77.8 mm. The shock wave surface of the sensor probe 6 faces the fourth through hole of the vertical plate 50. In a specific embodiment, the first through hole is provided with internal threads, and the sensor probe 6 is provided with external threads. The sensor probe 6 is threadedly connected to the first through hole. The sensor probe 6 is in communication with the sensor 11. The thickness of the probe mounting plate 17 ranges from 5 to 10 mm, for example, 5, 6, 7, 8, 9, 10 mm, and preferably 8 mm. The first through hole is provided with a plurality of, for example, 5, 6, 7, 8, 9, 10, preferably 7. The length of the tube 100 ranges from 120 to 150 mm, for example, 120, 130, 140, 150 mm, and preferably 140 mm. The length of the tube 100 is 4-5 times the diameter. The diameter of the tube 100 ranges from 28 to 32 mm, for example, 28, 29, 30, 31, 32 mm, and preferably 30 mm.

[0049] The box body (5) is provided with a rubber pad 10, which is a flat structure made of rubber. The rubber pad 10 is attached to the vertical plate 50 in the vertical state. The rubber pad 10 is provided with a second through hole at each position corresponding to the sensor probe 6, which is a circular hole structure (the diameter of the second through hole is 1-2 mm smaller than the outer diameter of the sensor probe 6). The setting of the rubber pad 10 effectively avoids the impact of the shock wave generated by the explosion on the box body 5, and protects the equipment in the box body 5 from being damaged by the shock wave. The two ends of the rubber pad 10 are provided with third through holes, which are circular in structure, for fixing the rubber pad 10 on the vertical plate 50 of the box body by screws, nuts and compression pieces. Specifically, the first through hole and the second through hole corresponding to the position of the sensor probe 6 are uniformly opened, so as to avoid the collision between the sensor probe 6 and the box body 5. In an embodiment (as shown in Figure 12 The end of the sensor probe 6 is close to the rubber pad 10 (the rubber pad is soft and elastic to protect the sensor probe from damage). The detected gas enters the box body 5 through the second through hole, and the sensor probe 6 detects the toxic gas in the explosion environment in the box body 5. The tube 100 can not only ensure the entry of gas into the box body 5, but also weaken the shock wave. In another embodiment (as shown in Figure 13The sensor probe 6 passes through the rubber pad 10 (and the vertical plate 50) into the pipe body 100, and the sensor probe 6 detects the toxic gas in the explosion environment outside the box body 5. The thickness of the rubber plate ranges from 3 to 8 mm, for example, 3, 4, 5, 6, 7, 8 mm, and preferably 5 mm thick. The second through hole is provided with a plurality of, for example, 5, 6, 7, 8, 9, 10, and preferably 7.

[0050] The pipe body 100 can not only ensure that the sensor probe 6 fully contacts the detected gas, but also protect the sensor probe 6 from damage by the explosion shock wave. The first through hole, the second through hole, and the fourth through hole are in communication with the pipe body 100. A back plate hole 101 is provided on the back plate of the box body 5 corresponding to the position of the first through hole. The back plate hole 101 is located in the middle of the back plate, and the horizontal distance is 100 mm. The diameter of the back plate hole 101 is smaller than the diameter of the first through hole, preferably 10 mm, and the error is controlled within 2 mm. Because the size of the back plate hole 101 is small (relative to the first through hole of the probe mounting plate 17), it can not only avoid a large amount of shock wave from entering and weakening the shock wave, but also facilitate air circulation.

[0051] After introducing the probe mounting plate 17, the rubber pad 10, and the vertical plate 50, we will now describe the internal structure of the box body 5 in detail.

[0052] A zinc locking back plate 12 is provided on the square bottom surface of the box body, and the zinc locking back plate 12 is in square shape (it can also be in rectangular, circular, or oval shape). The zinc locking back plate 12 is threadedly connected to the bottom surface of the box body (the zinc locking back plate 12 is fixed to the bottom surface of the box body by a locking nut 16).

[0053] The sensor 11, the data logger 13, and the battery 15 are provided on the zinc locking back plate 12. The sensor 11, the data logger 13, and the battery 15 are threadedly connected to the zinc locking back plate 12 (the sensor 11, the data logger 13, and the battery 15 are fixed to the zinc locking back plate 12 by screws). The battery 15 is electrically connected to the sensor 11 and the data logger 13; the battery 15 provides power to the sensor 11 and the data logger 13. The sensor 11 is in communication connection with the data logger 13, and the sensor 11 transmits gas data information to the data logger 13. The positions of the sensor 11, the data logger 13, and the battery 15 can be adjusted as needed. Preferably, the positions of the sensor probes 6 are uniformly distributed. The sensor 11 (in this detection device, it refers to the gas sensor 11) is designed in a split body (the sensor 11 and the sensor probe 6 are designed separately) and a live plug (the sensor 11 and the sensor probe 6 are connected by a plug), which can be freely configured according to the test measurement task. The sensor 11 adopts 0-10V voltage analog output, and real-time gas content is converted into a voltage signal and sent to the data logger 13 for reception.

[0054] The zinc lock back plate 12, the probe mounting plate 17 and the support plate 18 not only support the device, but also buffer the shock wave to the supporting parts.

[0055] The internal structure of the detection device is introduced above, and the support system of the detection device is introduced below.

[0056] The detection device comprises a support system, which comprises a footing plate 1, a first mounting rod 2 and a second mounting rod 3.

[0057] The footing plate 1 is horizontally arranged on the ground and has a square plate structure. The upper end of the footing plate 1 is fixedly connected with the first mounting rod 2 by welding, and the lower end of the footing plate 1 is fixedly connected with the ground by screwing. The footing plate 1 is provided with through holes, and the footing plate 1 is fixedly connected with the ground by expansion bolts through the through holes. The footing plate 1 is provided with a plurality of through holes, preferably four through holes, for mounting expansion bolts and fixing with the ground. The footing plate 1 is provided with a plurality of footing plates, preferably four footing plates.

[0058] The first mounting rod 2 and the second mounting rod 3 are made of angle steel and connected with each other by welding.

[0059] The first mounting rod 2 is vertically arranged below the bottom surface of the box body 5 and supports the entire box body 5. The upper end of the first mounting rod 2 is fixedly connected with the bottom surface of the box body 5 by screwing or welding, preferably by welding, and the lower end of the first mounting rod 2 is fixedly connected with the footing plate 1, preferably by welding. The first mounting rod 2 is provided with a plurality of first mounting rods, preferably four first mounting rods. Preferably, the first mounting rod 2 is arranged near each corner of the square bottom surface of the box body 5. The first mounting rod 2 can be welded with the footing plate 1 according to needs to further increase the firmness and reliability of the box body 5. Preferably, each first mounting rod 2 is provided with two reinforcing ribs, which are arranged on the two outer sides of the angle steel (the outer side refers to the side facing away from the center of the box body 5).

[0060] The second mounting rod 3 is horizontally arranged at the middle part of the first mounting rod 2 and connects the first mounting rod 2 in the circumferential direction. Preferably, the second mounting rod 3 is provided with four second mounting rods, which connect the four first mounting rods 2 in a square shape. The second mounting rod 3 plays a role of reinforcing and supporting the first mounting rod 2 and further enhances the reliability of the entire box body 5.

[0061] The box body 5, the footing plate 1, the first mounting rod 2 and the second mounting rod 3 are made of steel plates and steel bars of a certain thickness and are welded together. The thickness changes correspondingly according to different bearing values, and the weight is controlled under the premise of ensuring the bearing capacity.

[0062] The above is the structure of the detection device, the layout and trigger mode of the present application are discussed in detail below. The detection device adopts a lateral flow sampling layout. When the shock wave surface (the side surface of the box body) is placed vertically to the direction of the shock wave, the front surface of the box body and the inside of the device bear a smaller shock wave overpressure, and the inside of the device can obtain a good air flow rate to meet the sampling requirements.

[0063] The detection device adopts multiple trigger modes. One is hard trigger, including using a trigger line to connect the digital input port of the data recorder 13, using a high-low level change signal to trigger, or using a trigger line to connect a voltage and the trigger port of the data recorder 13, using a high-level signal to trigger. The second is soft trigger, that is, after the equipment is started, the specified width of data is continuously stored, and the data recorder 13 data recording function is triggered by judging that a certain segment of data appears a maximum signal value or a minimum signal value or an average value fluctuation.

[0064] After the detection device is triggered and started, the steps of data recording and processing are introduced as follows:

[0065] Step 1, start the data acquisition software program.

[0066] Step 2, run the program (start data acquisition).

[0067] Step 3, judge whether the specified width is reached (trigger the data recorder 13 data recording function by judging that a certain segment of data appears a maximum signal value or a minimum signal value or an average value fluctuation), adjust (that is, whether explosion occurs), if reached, continue to step 4, if not reached, delete the head data in the cache data and add the storage data at the tail.

[0068] Step 4, continuously collect and store data to the cache.

[0069] Step 5, identify the characteristic value in the data segment.

[0070] Step 6, judge the characteristic value in the data segment (for example, the average value of a certain gas for three times is greater than the average value of the previous three times, which indicates that there is a special situation, and the storage is started).

[0071] Step 7, store the data segment from the cache to the hard disk.

[0072] Step 8, terminate the program (for monitoring test, after the data is collected and stored, it is automatically terminated.

[0073] For monitoring, after the characteristic value appears and the data is stored, continue to run until the last manual termination.

[0074] Next, we will specifically introduce the gas sampling.

[0075] First, we introduce the calculation model, the calculation is carried out by using two-dimensional (2D) model, the width of the tunnel is 4.4m, and the length is 5m. In order to avoid the air inlet of the device directly facing the shock wave, the detection device considers two working conditions of 0 degree and 15 degrees with the vertical direction of the shock wave. The top view of the calculation model is shown in Figure 2 . Four pressure and velocity output observation points are set for each working condition model. P1 is a random point outside, P2 is a random point inside the pipe body 100, P3 is the center point inside, and P4 is the maximum pressure point of the windward surface. The specific positions are shown in Figure 2 . Each inlet uses a velocity inlet, and the inlet velocity is loaded in a time-varying manner. The simplified velocity time curve is shown in Figure 3 . The air is ideal air, and the initial temperature is 300K. The calculation model uses Viscous (SST k-omega).

[0076] Second, the calculation results

[0077] 1. Comparison of velocity and pressure of two points inside and outside the detection device placed at 0 degree

[0078] The comparison chart of pressure and velocity time curves inside the detection device from the shock wave surface, inside the sampling pipe body 100, and inside the detection device in the tunnel can be seen from Figure 4 . The pressure inside the detection device is about 0.5Mpa, which is much lower than the pressure outside of 11Mpa, and a higher air flow rate of 700-800m / s can be obtained.

[0079] 2. Comparison of velocity and pressure of two points inside and outside the detection device placed at 15 degrees

[0080] The comparison chart of pressure and velocity time curves inside the detection device from the shock wave surface, inside the sampling pipe body 100, and inside the detection device in the tunnel can be seen from Figure 5 . The shock wave surface will bear a larger shock wave overpressure, and the pressure inside the sampling pipe body 100 and the detection device is about 0.7Mpa, and a higher air flow rate of about 700m / s can be obtained.

[0081] 3. Pressure and velocity of the shock wave surface under two working conditions

[0082] The pressure and velocity time curves of the random point and the maximum pressure point of the shock wave surface when placed at 0 and 15 degrees are shown in Figure 6 and Figure 7From which we can see: first, under two angles, the shock wave surface and the maximum pressure point of the surface withstand the shock wave overpressure value basically the same, indicating that the detection device shock wave surface overpressure value is more uniform; second, the maximum speed of the shock wave surface is basically the same, but when placed at 15 degrees, it is significantly lagging behind, and the pressure maximum point is basically stationary when the working condition is 0°, indicating that when the working condition is 0°, the air flowability is better, which plays a better pressure relief role, and at the same time explains why the shock wave overpressure on the shock wave surface is greater when placed at 15 degrees.

[0083] When the working condition is 0°, the detection device shock wave surface and the detection device interior both withstand smaller shock wave overpressure, and the detection device interior can obtain better air flow rate.

[0084] The above is the gas sampling of the detection device.

[0085] The detection device will be described below.

[0086] 1. Test summary

[0087] The explosion environment test of the detection device was carried out in a certain large-scale TNT explosion damage capability test in China, and the detection device was placed as shown in Figure 8 .

[0088] 2. Test data processing

[0089] In a certain explosion test, the device measured six kinds of gases: HS, CO, O2, CO2, SO2 and NO2, and the original time curve is shown in Figure 9 .

[0090] Common filtering methods can be divided into linear and nonlinear, linear filtering mainly includes least mean square error filtering and filtering algorithm based on least square criterion, nonlinear filtering includes Unscented Kalman filter (UKF), central difference Kalman filter (CDKF) and volume Kalman filter (CKF), filtering algorithm includes amplitude clipping de-bouncing filtering method (also known as program judgment filtering method), median filtering method, arithmetic average filtering method, first-order lag filtering method, weighted recursive average filtering method, de-bouncing filtering method, recursive average filtering method (also known as sliding average filtering method), median average filtering method (also known as anti-pulse interference average filtering method), amplitude limiting average filtering method.

[0091] The problem with these methods is that the maximum value is easily filtered out, for example: after recursive average filtering and arithmetic average filtering, the time curve of sulfur dioxide gas content is shown in Figure 10 , and the maximum value of sulfur dioxide gas content is less than 0.18.

[0092] For the protection profession, it is beneficial to retain the maximum value in the data segment, so the device designs a maximum value filtering algorithm, and the algorithm program is written, and the sulfur dioxide gas is filtered and tested, and the test effect is good, and the comparison before and after filtering is seen Figure 11 .

[0093] There are many evaluation algorithms for filtering, and the evaluation effect index is mainly related to the demand. In order to evaluate the filtering effect of the detection device, the explained_variance_score, Meanabsoluteerror, Meansquarederror, Meansquaredlogarithmicerror, Medianabsoluteerror and R 2 score of the machine learning tool Sklearn library are used to evaluate the six evaluation indexes, and the results of the six parameters are seen from the results of the six parameters. The filtering effect is acceptable. The evaluation index and result of the sulfur dioxide gas content filtering effect are shown in Table 2.

[0094] Table 2 Evaluation index and result of sulfur dioxide gas content filtering effect

[0095]

[0096] 3、Conclusion

[0097] This paper presents a detection device scheme for toxic gases in explosive environment, and a prototype is developed and tested in real explosion. The results show that the detection device can realize the detection of the content of various toxic gases in explosive environment.

[0098] This paper simulates and calculates the two angle placement conditions of the detection device, and the results show that when the impact wave surface is perpendicular to the impact wave direction, the surface and the internal of the detection device bear smaller impact wave overpressure, and the internal of the detection device can obtain better air flow rate to meet the sampling demand.

[0099] This paper designs, programs and tests the data processing algorithm of the device, and the results show that its effect can better meet the needs of the protection profession for data.

[0100] The protection problem of toxic gases in detonation gas is one of the important contents in the field of engineering protection research, and the accurate determination of toxic gas content in explosion environment is an important aspect that puzzles related research. Therefore, this paper sorts out the technical problems related to the measurement of gas content in explosion environment, proposes a detection device scheme for toxic gases in explosion environment, through the system integration design of the detection device, research on gas sampling method and data processing algorithm, etc. A prototype is developed and tested in real explosion, and the test results show that the detection device can realize real-time detection of toxic gas content in explosion environment, which makes up for the shortcomings of existing toxic gas detection methods, and can greatly improve the detection operation and data processing efficiency. It has important reference value for the research of environmental detection, environmental perception and intelligent control related topics.

[0101] For those skilled in the art, the present application can be implemented by other embodiments without departing from the spirit or essential characteristics thereof. Obviously, the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, no matter from which point of view, it is only an example, not the only one, and the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims. Any reference signs in the claims should not be regarded as limiting the claims. All changes within the scope of the present application or within the scope equivalent to the present application are included in the present application.

Claims

1. A device for detecting toxic gases in an explosive environment, characterized in that The detection device comprises: a box body (5); The box body (5) comprises a box cover (14) and a box main body; The front of the box main body is provided with a vertical plate (50); the inner side of the vertical plate (50) is provided with a probe mounting plate (17); The probe mounting plate (17) is provided with a plurality of first through holes and sensor probes (6) mounted in the first through holes; The vertical plate (50) is provided with a fourth through hole corresponding to each of the sensor probes (6); The shock wave surface of the sensor probe (6) faces the fourth through hole of the vertical plate (50); A pipe body (100) is provided outside the vertical plate (50) of the box main body and in communication with the fourth through hole; A sensor (11) and a data recorder (13) are provided in the box main body; The sensor (11) and the data recorder (13) are communicatively connected, and the sensor (11) transmits gas data information to the data recorder (13); The sensor (11) and the sensor probe (6) are communicatively connected; the box body (5) is provided with a rubber pad (10); the rubber pad is arranged between the probe mounting plate (17) and the vertical plate (50) and abuts against the vertical plate (50); The rubber pad (10) is provided with a second through hole at a position corresponding to each of the sensor probes (6); The first through hole is in communication with the second through hole, the fourth through hole and the pipe body (100); The left and right ends of the probe mounting plate (17) are provided with support plates (18), and the probe mounting plate (17) is fixedly connected to the two side surfaces of the box main body through the support plates (18).

2. The detection device according to claim 1, wherein One end of the sensor probe (6) is close to the second through hole of the rubber pad (10).

3. The detection device according to claim 1, wherein One end of the sensor probe (6) passes through the second through hole of the rubber pad (10) and enters the pipe body (100).

4. The detection device according to claim 2, wherein A back plate hole (101) is arranged on the back plate of the box main body at a position corresponding to the first through hole.

5. The detection device according to claim 4, wherein The diameter of the back plate hole (101) is smaller than the diameter of the first through hole.

6. The detection device according to claim 1, wherein The detection device comprises a support system; The support system comprises a foot plate (1), a first mounting rod (2) and a second mounting rod (3); The foot plate (1) is horizontally arranged on the ground, the lower end of the foot plate (1) is fixedly connected to the ground, and the upper end of the foot plate (1) is fixedly connected to the first mounting rod (2); The upper end of the first mounting rod (2) is fixedly connected to the bottom surface of the box main body, and the lower end is fixedly connected to the foot plate; The second mounting rod (3) is horizontally arranged at the middle part of the first mounting rod (2); The second mounting rod (3) is circumferentially connected to the first mounting rod (2).

7. The detection device according to claim 1, wherein The box body opening is upward; the box cover (14) is in shape corresponding to the opening shape of the box body, and the box cover (14) and the box body are threadedly connected; A zinc lock back plate (12) is arranged on the bottom surface of the box body; A storage battery (15), the sensor (11) and a data recorder (13) are arranged on the zinc lock back plate (12); The storage battery (15) is electrically connected with the sensor (11) and the data recorder (13); The storage battery (15) provides power for the sensor (11) and the data recorder (13); The sensor (11), the data recorder (13), the storage battery (15) and the zinc lock back plate (12) are threadedly connected.

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