Broad-spectrum gas detection device for fire rescue site

Abstract

The utility model belongs to the technical field of gas detection on a fire-fighting scene, and particularly relates to a broad-spectrum gas detection device for a fire-fighting rescue scene. Comprising a sample injection port, a Fourier infrared spectrum detection device (FTIR), a headspace heating sample injection device, a four-way pipe, an air extracting pump, an air blowing tank and a main control device, the sample injection port, the FTIR, the headspace heating sample injection device and the air blowing tank are connected to the four-way pipe; an air outlet of the FTIR is connected to an air extracting pump; the air blowing tank can blow compressed air to the four-way pipe; the headspace heating and sampling device comprises a turntable, a heater, a gas sampler, a lifting rod and a sample tank, and is used for detecting gas components separated out of environmental soil; and the FTIR, the sucking pump, the heating device, the rotating motor of the turntable, the heater and the lifting rod are all connected with the main control device and are controlled by the main control device. The device is simple and convenient to operate, diversified in function, wide in detection range, short in detection time and capable of detecting volatile components in environmental gas and solid samples.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas detection at firefighting sites, and in particular relates to a broad-spectrum gas detection device for firefighting rescue sites. Background Art

[0002] The detection of environmental gases and volatile components at fire rescue sites such as hazardous chemical accidents and fires is an important task for fire rescue teams to carry out emergency response, which is of great significance for personnel safety, rescue plan formulation, accident cause investigation, post-disaster environmental assessment, etc. However, due to the complexity, unknown and diversity of gas samples at many disaster accident sites, fire brigades often face various complex and arduous challenges when carrying out emergency response work, and existing detection equipment still has some application limitations in practical applications.

[0003] Although electrochemical technology has the characteristics of high sensitivity and specificity, it can only accurately respond to a certain type of specific gas and cannot detect other types of gases besides specific gases; even if the electrochemical sensor is integrated into a few-in-one or all-in-one detection equipment, the detection range is very limited compared with the large number of gas types, and cannot meet the requirements of comprehensive detection of complex and diverse substances on site, and is easily affected by temperature, humidity, dust, gas accumulation and interfering gases, resulting in reduced working performance. Gas chromatography-mass spectrometry technology can perform qualitative and quantitative analysis of gas samples, and has the advantages of mature technology and accurate results. In recent years, portable gas chromatography / mass spectrometry detection instruments have appeared. However, it is also accompanied by complex operating processes and additional mobile phase conditions such as gas sources; in addition, the instruments and equipment are expensive and the detection is time-consuming, which brings many inconveniences to fire scene work. Laser and multi-spectral imaging telemetry technology can detect dangerous gases in real time at a safe distance, but its detection is easily interfered with and the detection accuracy is not high, so it cannot effectively meet the needs of quantitative detection of environmental gas components at the accident site. In addition, residual compounds at the scene often penetrate into solid matrices at the scene, such as soil and concrete. The volatile compound components in these solid matrices are also important contents of fire scene detection. Different sample types bring more difficulties to the on-site application of conventional detection instruments. Summary of the invention

[0004] The utility model aims to provide a broad-spectrum gas detection device for fire rescue sites, which has high integration, convenient operation, wide detection range and short detection time.

[0005] The utility model provides a broad-spectrum gas detector for fire rescue sites, comprising an environmental gas sampling port, a Fourier infrared spectrum detection device (FTIR), a headspace heating sampling device, a four-way pipe, an air pump, an air blowing tank and a main control device;

[0006] The Fourier infrared spectrum detection device is provided with a gas pool; the light beam emission port of the Fourier infrared spectrum detection device can irradiate the gas in the gas pool;

[0007] The environmental gas inlet, gas pool, head space heating injection device and air blowing tank are respectively connected to the four pipe openings of the four-way pipe through pipelines; the four pipe openings of the four-way pipe are all provided with switch valves;

[0008] The gas pool is a sealed box, provided with an air inlet and an air outlet, the air inlet is connected to a four-way pipe through a pipeline, a heating device is provided on the pipeline, and the gas entering the gas pool through the pipeline can be heated; the air outlet of the gas pool is connected to a vacuum pump through a pipeline;

[0009] The blowing tank is used to store compressed gas and can blow the gas in the tank toward the four-way pipe;

[0010] The head space heating sample injection device comprises a box body, and a turntable, a heater, a gas injector, a lifting rod and a plurality of sample tanks arranged in the box body; wherein:

[0011] The turntable is a circular disk, which is arranged at the bottom of the box body. The heater is a heating wire, which is arranged under the turntable. The turntable is provided with concave surfaces arranged at equal intervals around the center of the circle. The sample can is positioned in the concave surface and can rotate with the turntable.

[0012] The sample tank is used to store the collected solids, and the top is a soft rubber sealing cover;

[0013] The lifting rod is arranged on the top of the box body, the moving rod end of the lifting rod faces downward, and the gas injector is arranged at the end;

[0014] The gas sampler is a sealed container with a needle tube, and the container is provided with an injection port and an air suction port; the needle tube is arranged on the injection port, and the needle head faces downward, facing a concave position on the turntable; the pipeline connecting the head space heating injection device and the four-way pipe is connected to the air suction port of the gas sampler; the needle head can be lowered with the lifting rod, inserted into and passed through the soft rubber sealing cover of the sample tank located on the concave surface, and connected to the gas sampler through the four-way pipe via the vacuum pump, and the gas sampler can absorb the gas to be tested in the sample tank through the needle tube;

[0015] The Fourier infrared spectrum detection device, the vacuum pump, the heating device, the rotating motor of the turntable, the heater, and the lifting rod are all connected to the main control device through lines and are controlled and powered by the main control device;

[0016] The main control device is provided with a display for displaying the detection data and control data of the Fourier infrared spectrum detection device.

[0017] In the utility model, a filter capable of filtering solid impurities in the gas is arranged at the environmental gas inlet.

[0018] In the utility model, the valve switch is an electronic valve, which is connected to a main control device and is subject to switch control.

[0019] In the utility model, the heating device is a heating wire which is wound on the pipeline to heat the pipeline.

[0020] In the utility model, the blowing tank is a nitrogen compressed gas tank, which can produce a maximum exhaust gas pressure of 15Mpa, and the pressure of the exhaust gas can be adjusted by a pressure reducing device.

[0021] When the utility model is used, there are the following two working modes.

[0022] (1) Place the device in the environment to be tested, control the main control device to close the valve on the four-way pipe that connects the headspace heating sampling device and the air blowing tank interface, start the vacuum pump, and the ambient gas can be sucked in through the ambient gas inlet and enter the gas pool in the Fourier infrared spectroscopy detection device. The main control device turns on the heating device on the pipeline connecting the four-way pipe and the gas pool, so that the ambient gas entering the gas pool is heated to avoid condensation, so that the gas composition can be better detected. After the ambient gas enters the gas pool, the Fourier infrared spectroscopy detection device is started, and the detection beam passes through the gas pool to detect the ambient gas composition, and the detection information is fed back to the main control device and displayed on the display.

[0023] (2) Controlling the closing of the valve on the four-way pipe connecting the environmental gas injection port and the air blowing tank interface through the main control device, placing the artificially collected environmental soil in different sample tanks, and closing and sealing the sample tank openings with rubber sealing covers; placing the sample tanks in the concave surface on the turntable; controlling the turntable to rotate through the main control device so that the sample tanks are located below the lifting rods; starting the heater to heat the sample tanks through heat transfer from the turntable, so that the soil is heated and the gas is better released; controlling the lifting rod to descend through the main control device so that the needle of the gas injector passes through the rubber sealing cover and is inserted into the sample tank; starting the vacuum pump to suck out the gas in the sample tank and enter the gas pool through the gas injector and the four-way pipe for detection;

[0024] When necessary, the main control device can be used to control the closing of the valve on the four-way tube connected to the ambient gas inlet and the gas pool interface, and at the same time, the valve on the four-way tube connected to the air blowing tank interface and the head space heating injection device can be opened to allow the gas in the air blowing tank to enter the sample tank, in order to replace and carry out the volatile components. Then, the valve on the four-way tube connected to the air blowing tank interface is closed, and the valve on the four-way tube connected to the gas pool interface is opened, so that the gas enters the gas pool in the Fourier infrared spectrometer detection device under the action of the vacuum pump.

[0025] After the detection of the utility model is completed, the valves of the corresponding environmental gas injection port and the head space heating injection device are closed, and the valve of the corresponding blowing tank is opened, and the compressed gas in the blowing tank enters the gas pool to purge and empty the residual test gas; the valve of the docking blowing tank can also be opened to blow compressed gas into the connecting pipeline of the head space heating injection device and the environmental gas injection port to purge the residual environmental gas in each pipeline and device.

[0026] The utility model has the advantages of simple operation, diverse functions, wide detection range and short detection time. It can not only detect environmental gases, but also detect volatile components in solid samples. It uses the characteristics of Fourier transform infrared spectroscopy technology to identify the molecular structure of compounds and can realize broad-spectrum detection of various gases. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the connection relationship of the structural modules of the utility model.

[0028] Figure 2 This is a diagram showing the internal structure of the headspace heated injection device.

[0029] Numbers in the figure: 1 is the ambient gas injection port, 2 is the Fourier infrared spectrum detection device, 3 is the gas cell, 4 is the head space heating injection device, 5 is the four-way pipe, 6 is the vacuum pump, 7 is the blowing tank, 8 is the main control device, 9 is the heating device, 10 is the turntable, 11 is the heater, 12 is the gas injector, 13 is the lifting rod, 14 is the sample tank, and 15 is the filter. DETAILED DESCRIPTION

[0030] The utility model comprises an environmental gas sampling port 1, a Fourier infrared spectrum detection device 2, a headspace heating sampling device 4, a four-way pipe 5, an air pump 6, an air blowing tank 7 and a main control device 8, which are uniformly arranged in a four-wheel mobile device.

[0031] The Fourier infrared spectrum detection device 2 is provided with a gas pool 3; the light beam emission port of the Fourier infrared spectrum detection device 2 can irradiate the gas in the gas pool 3;

[0032] The environmental gas inlet 1, the gas pool 3, the head space heating injection device 4 and the blowing tank 7 are respectively connected to the four pipe openings of the four-way pipe 5 through soft pipes; the four pipe openings of the four-way pipe 5 are all provided with electronic switch valves; the environmental gas inlet 1 is provided with a filter 15 that can filter solid impurities in the gas, and the environmental gas inlet 1 is arranged at the top of the housing of the four-wheel mobile device;

[0033] The gas pool 3 is a sealed box, provided with an air inlet and an air outlet, the air inlet is connected to the four-way pipe 5 through a pipeline, the pipeline is provided with a heating device 9, the heating device 9 is a heating wire, which is wound on the pipeline to heat the pipeline, that is, it can heat the gas entering the gas pool 3 through the pipeline; the air outlet of the gas pool 3 is connected to the air pump 6 through a pipeline; the exhaust port of the air pump 6 is arranged on the side of the housing of the four-wheel mobile device;

[0034] The blowing tank 7 is used to store compressed gas and can blow the gas in the tank toward the cross-way pipe 5.

[0035] The head space heating sample injection device 4 comprises a cubic box, and a turntable 10, a heater 11, a gas injector 12, a lifting rod 13 and a sample tank 14 arranged in the box; wherein:

[0036] The box body can be made of transparent acrylic material, one of which is made into an openable door, and a sealing rubber ring is provided on the edge of the door to ensure the closed seal and facilitate operation to observe the condition inside the box; the openable door is arranged on one side of the shell of the four-wheel mobile device for easy opening operation;

[0037] The turntable 10 is a circular disk, which is driven to rotate by a motor at the central axis position and is arranged at the bottom of the box body. The heater 11 is a heating wire, which is coiled and arranged under the turntable 10 and can heat the turntable 10. The turntable 10 is provided with four concave surfaces arranged at equal intervals around the center of the circle. There are four corresponding sample tanks 14, which can be placed in the concave surfaces for positioning and can rotate with the turntable 10.

[0038] The sample tank 14 is used to store the collected solids, and the top opening is provided with a replaceable soft rubber sealing cover;

[0039] The lifting rod 13 is arranged at the top of the box body, the moving rod end of the lifting rod 13 faces downward, and the gas injector 12 is arranged at the end;

[0040] The gas injector 12 is a sealed container with a needle tube, on which an injection port and an air suction port are provided; the injection port is provided with a needle tube, with the needle facing downward, facing a concave position on the turntable; the pipeline connecting the four-way pipe 5 and the head space heating injection device 4 is connected to the air suction port of the gas injector 12; the needle can descend with the lifting rod 13, insert into and pass through the soft rubber sealing cover of the sample tank 14 located on the concave surface, and the vacuum pump 6 is connected to the gas injector 12 through the four-way pipe 5, and the gas injector 12 can absorb the gas to be tested in the sample tank 14 through the needle tube.

[0041] The lifting rod 13 can be a commercially available 12V / 24V DC motor electric hydraulic telescopic rod, and the size specification is selected or customized according to the actual box size.

[0042] The Fourier infrared spectrum detection device 2, the vacuum pump 6, the heating device 9, the rotating motor of the turntable 10, the heater 11, the lifting rod 13, and the electronic switch valve are all connected to the main control device 8 through the line and are controlled by the main control device 8;

[0043] The main control device 8 is provided with a display and a control panel, which displays the detection data and control data of the Fourier infrared spectrum detection device 2. The display and the control panel are arranged on the surface of the housing of the four-wheeled mobile device.

[0044] The blowing tank 7 is a nitrogen compressed gas tank, which can produce a maximum exhaust gas pressure of 15 MPa, and the exhaust gas pressure can be adjusted by a pressure reducing device.

[0045] The four-wheel mobile device has a built-in lithium battery to provide power for driving various devices.

[0046] When the utility model is used, there are the following two working modes.

[0047] (1) Place the device in the environment to be tested, control the main control device to close the valve on the four-way pipe that connects the headspace heating sampling device and the air blowing tank interface, start the vacuum pump, and the ambient gas can be sucked in through the ambient gas inlet and enter the gas pool in the Fourier infrared spectroscopy detection device. The main control device turns on the heating device on the pipeline connecting the four-way pipe and the gas pool, so that the ambient gas entering the gas pool is heated to avoid condensation, so that the gas composition can be better detected. After the ambient gas enters the gas pool, the Fourier infrared spectroscopy detection device is started, and the detection beam passes through the gas pool to detect the ambient gas composition, and the detection information is fed back to the main control device and displayed on the display.

[0048] (2) Controlling the closing of the valve on the four-way pipe connecting the environmental gas injection port and the air blowing tank interface through the main control device, placing the artificially collected environmental soil in different sample tanks, and closing and sealing the sample tank openings with rubber sealing covers; placing the sample tanks in the concave surface on the turntable; controlling the turntable to rotate through the main control device so that the sample tanks are located below the lifting rods; starting the heater to heat the sample tanks through heat transfer from the turntable, so that the soil is heated and the gas is better released; controlling the lifting rod to descend through the main control device so that the needle of the gas injector passes through the rubber sealing cover and is inserted into the sample tank; starting the vacuum pump to suck out the gas in the sample tank and enter the gas pool through the gas injector and the four-way pipe for detection;

[0049] When necessary, the main control device can be used to control the closing of the valve on the four-way tube connected to the ambient gas inlet and the gas pool interface, and at the same time, the valve on the four-way tube connected to the air blowing tank interface and the head space heating injection device can be opened to allow the gas in the air blowing tank to enter the sample tank, in order to replace and carry out the volatile components. Then, the valve on the four-way tube connected to the air blowing tank interface is closed, and the valve on the four-way tube connected to the gas pool interface is opened, so that the gas enters the gas pool in the Fourier infrared spectrometer detection device under the action of the vacuum pump.

[0050] After the detection of the utility model is completed, the valves of the corresponding environmental gas injection port and the head space heating injection device are closed, and the valve of the corresponding blowing tank is opened, and the compressed gas in the blowing tank enters the gas pool to purge and empty the residual test gas; the valve of the docking blowing tank can also be opened to blow compressed gas into the connecting pipeline of the head space heating injection device and the environmental gas injection port to purge the residual environmental gas in each pipeline and device.

[0051] Although the above methods are illustrated and described as a series of structures for simplicity of explanation, it should be understood and appreciated that these methods are not specifically limited because according to one or more embodiments, some structures may occur in different orders and / or concurrently with other actions from those illustrated and described herein or not illustrated and described herein but understandable to those skilled in the art.

[0052] The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A broad-spectrum gas detection device for fire rescue sites, characterized in that: It includes an environmental gas sampling port, a Fourier infrared spectrum detection device, a headspace heating sampling device, a four-way pipe, a vacuum pump, a blowing tank and a main control device; The Fourier infrared spectrum detection device is provided with a gas pool; the light beam emission port of the Fourier infrared spectrum detection device can irradiate the gas in the gas pool; The environmental gas inlet, gas pool, head space heating injection device and air blowing tank are respectively connected to the four pipe openings of the four-way pipe through pipelines; the four pipe openings of the four-way pipe are all provided with switch valves; The gas pool is a sealed box, provided with an air inlet and an air outlet, the air inlet is connected to a four-way pipe through a pipeline, a heating device is provided on the pipeline, and the gas entering the gas pool through the pipeline can be heated; the air outlet of the gas pool is connected to a vacuum pump through a pipeline; The blowing tank is used to store compressed gas and can blow the gas in the tank toward the four-way pipe; The head space heating sample injection device comprises a box body, and a turntable, a heater, a gas injector, a lifting rod and a plurality of sample tanks arranged in the box body; wherein: The turntable is a circular disk, which is arranged at the bottom of the box body. The heater is a heating wire, which is arranged under the turntable. The turntable is provided with concave surfaces arranged at equal intervals around the center of the circle. The sample can is positioned in the concave surface and can rotate with the turntable. The sample tank is used to store the collected solids, and the top is a soft rubber sealing cover; The lifting rod is arranged on the top of the box body, the moving rod end of the lifting rod faces downward, and the gas injector is arranged at the end; The gas sampler is a sealed container with a needle tube, and the container is provided with an injection port and an air suction port; the needle tube is arranged on the injection port, and the needle head faces downward, facing a concave position on the turntable; the pipeline connecting the head space heating injection device and the four-way pipe is connected to the air suction port of the gas sampler; the needle head can be lowered with the lifting rod, inserted into and passed through the soft rubber sealing cover of the sample tank located on the concave surface, and connected to the gas sampler through the four-way pipe via the vacuum pump, and the gas sampler can absorb the gas to be tested in the sample tank through the needle tube; The Fourier infrared spectrum detection device, the vacuum pump, the heating device, the rotating motor of the turntable, the heater, and the lifting rod are all connected to the main control device through lines and are controlled and powered by the main control device; The main control device is provided with a display for displaying the detection data and control data of the Fourier infrared spectrum detection device.

2. The broad-spectrum gas detection device for fire rescue scene according to claim 1, characterized in that: A filter capable of filtering solid impurities in the gas is arranged at the ambient gas inlet.

3. The broad-spectrum gas detection device for fire rescue scene according to claim 1 or 2, characterized in that: The valve switch is an electronic valve, which is connected to a main control device and is subject to switch control.

4. The broad-spectrum gas detection device for fire rescue scene according to claim 1 or 2, characterized in that: The heating device is a heating wire, which is wound on the pipeline to heat the pipeline.

5. The broad-spectrum gas detection device for fire rescue scene according to claim 1 or 2, characterized in that: The blowing tank is a nitrogen compressed gas tank.

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