CN108614083A - Gas analyzer and method for detecting rubber asphalt pungent odour ingredient - Google Patents

Abstract

The invention discloses a gas analyzer for detecting irritating odor components of rubber asphalt. The head of the trachea is equipped with a trumpet-shaped gas collection port, on which a temperature sensor, a micro-camera and a range finder are installed. Multiple gas sensors are installed in the gas detection chamber, and molecular sieve adsorption layers, chemical adsorption Cotton layer and activated carbon layer; the front panel of the housing is provided with a liquid crystal display, and the back is provided with a fixing mechanism; the structure is simple, the operation is convenient, the detection is fast, and the result is accurate. The method of using this gas analyzer to detect the irritating odor components of rubber asphalt, collects signals through various gas sensors installed in the gas detection chamber and conducts rapid analysis through a single-chip microcomputer, and the results can be directly displayed on the LCD screen, which is very intuitive and effective Avoid causing harm to the human body.

Description

Gas analyzer and method for detecting irritating odor components of rubber asphalt

technical field

The invention relates to the technical field of gas analysis equipment, in particular to a gas analyzer for detecting the irritating odor components of rubber asphalt, and a method for detecting the irritating odor components of rubber asphalt using the gas analyzer.

Background technique

Rubber asphalt is first processed from waste tires into rubber powder, and then combined according to a certain ratio of thickness and fineness. ), a modified asphalt cementitious material formed after fully swelling reaction with base asphalt. The application of rubber asphalt can greatly reduce the harm and impact of waste tires on the natural environment. However, the toxic gas with pungent odor produced during the production process of rubber asphalt will affect the health of surrounding workers. In order to reduce the hazards of rubber asphalt, it is necessary to conduct gas detection and analysis during the production process in order to control toxic and harmful gases in a targeted manner. Since most of the irritating gases are produced in the rubber asphalt heating storage tank, the analysis results here are often used as the standard. However, due to the airtight tank body and its high internal temperature, sampling is very difficult, which greatly affects the test results .

Contents of the invention

The invention provides a gas analyzer for detecting the irritating odor components of rubber asphalt, and at the same time provides a method for detecting the irritating odor components of rubber asphalt with a gas analyzer, which is used to solve the current sampling difficulties and results in gas analysis. The problem of large deviations.

To achieve the above object, the present invention can take the following technical solutions:

The gas analyzer for detecting the irritating odor components of rubber asphalt according to the present invention includes a housing, and the housing is provided with an air pump, a gas detection chamber and a gas adsorption box connected in sequence through an air duct, and the air pump is The inlet is connected with an air intake pipe extending to the outside of the housing through a universal joint. The head of the air intake pipe is provided with a trumpet-shaped gas collection port. The gas detection chamber is provided with a hydrogen sulfide sensor, a sulfur dioxide sensor, a methane sensor, a carbon monoxide sensor, a carbon dioxide sensor, a nitrogen dioxide sensor and a toluene sensor, and a molecular sieve adsorption layer, a chemical adsorption cotton Layer and activated carbon layer, the outlet of the gas adsorption box is connected with an exhaust pipe leading to the outside of the housing; a liquid crystal display screen for displaying test results is arranged on the front panel of the housing, and a fixing mechanism is provided on the back of the housing; the temperature sensor , micro-camera, range finder, hydrogen sulfide sensor, sulfur dioxide sensor, methane sensor, carbon monoxide sensor, carbon dioxide sensor, nitrogen dioxide sensor and toluene sensor signal output terminals are respectively electrically connected to the signal input terminal of the single-chip microcomputer, the signal of the single-chip microcomputer The output end is electrically connected with the signal input end of the liquid crystal display.

The air guiding pipe and the exhaust pipe are anti-corrosion flexible pipes, which are convenient for assembly and prolong the service life of the equipment.

The air intake pipe is an anti-corrosion telescopic pipe, which is convenient to adjust the air intake pipe to the most suitable length, so that the trumpet-shaped gas collection port reaches the most suitable collection position, which is beneficial to gas collection, and at the same time, prevents it from being corroded by gas.

The hydrogen sulfide sensor, sulfur dioxide sensor, methane sensor, carbon monoxide sensor, carbon dioxide sensor, nitrogen dioxide sensor and toluene sensor are all plug-and-play electrochemical sensors, which are convenient for assembly and replacement.

The front panel of the housing is provided with a movable transparent cover plate corresponding to the position of the gas detection chamber, which is convenient for replacing the used sensor.

The front panel of the housing is provided with an indicator light and a buzzer for displaying the working status, which is convenient for operation.

The housing is provided with a rechargeable power supply battery pack, which effectively improves the portability of the device.

A transparent flexible protective cover is provided on the outside of the housing, which can effectively protect the equipment in terms of waterproof and moisture-proof.

The fixing mechanism is a folding bracket or an adhesive strap, which can be placed on the top of the heating storage tank or wrapped around the operator's arm to carry around.

The method for detecting the irritating odor component of rubber asphalt by the gas analyzer comprises the following steps:

The first step is to check the airtightness of the connection between the intake pipe, the air pump, and the horn-shaped air collection port. After ensuring that there is no air leakage, turn on the machine and preheat for 3-5 minutes;

The second step is to extend the air intake pipe into the rubber asphalt heating storage tank, and make the trumpet-shaped gas collection port 30-50cm below the tank mouth, start the air pump to suck the gas for 3-5 minutes, and record the test results on the LCD screen;

The third step is to pull the intake pipe away from the rubber asphalt heating storage tank, so that the trumpet-shaped air collection port is located in the fresh air, keep the air pump for 5-10 minutes, turn off the machine, and complete the detection process.

The gas analyzer for detecting the irritating odor components of rubber asphalt provided by the invention has the advantages of simple structure, convenient operation, quick detection and accurate result. When testing and using, extend the trumpet-shaped gas collection port at the end of the intake pipe into the rubber asphalt heating storage tank, the sampling result is more accurate, and the signal is collected through various gas sensors installed in the gas detection chamber and quickly analyzed by the single-chip microcomputer , the result can be directly displayed on the LCD screen, which is very intuitive, and is conducive to the follow-up targeted treatment of harmful gas components to avoid harm to the human body.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a block diagram of the electric control principle of the present invention.

Detailed ways

As shown in Figure 1, the gas analyzer for detecting the irritating odor components of rubber asphalt according to the present invention includes a plastic housing 1, and the housing 1 is provided with an air pump 2 and a gas detection chamber connected in sequence through an air guide tube. 3 and a gas adsorption box 4, wherein the inlet of the air pump 2 is connected with an intake pipe 5 extending outside the housing 1, a plurality of gas sensors are installed in the gas detection chamber 3, and the gas adsorption box 4 is filled with a gas adsorbent, and the gas adsorption The outlet of the box 4 communicates with an exhaust pipe 10 leading to the outside of the housing 1 , and the housing 1 is equipped with a liquid crystal display 11 for displaying test results.

Specifically, the intake pipe 5 is connected to the air pump 2 through a universal joint that can be bent and rotated. In order to enable the analyzer to adapt to different tank depths, the inlet pipe 5 is usually a stainless steel anti-corrosion telescopic pipe with a tetrafluoro-coated surface that is nested together (up to 1.0m when stretched). In order to facilitate gas collection, the head of the intake pipe 5 is also connected with a trumpet-shaped gas collection port 6 made of hard anti-corrosion plastic. Since both the sampling position and the gas temperature will affect the gas detection result, a temperature sensor 7 , a miniature camera 8 and a range finder 9 are also arranged on the horn-shaped gas collection port 6 . Wherein, the temperature sensor 7 can monitor the temperature in the tank in real time; the miniature camera 8 contains exposure and camera functions, and can transmit the situation in the tank on the display screen 11 in real time, so that the operator can choose a suitable sampling position; To test the distance between the trumpet-shaped air collecting port 6 and the surface of the asphalt liquid and the tank wall, determine its specific position in the tank, and prevent accidental contact with the asphalt and the tank wall; the above-mentioned air guide pipe and exhaust pipe 10 are made of PTFE The high temperature and anti-corrosion hose is easy to assemble and prolongs the service life of the equipment.

A hydrogen sulfide sensor, a sulfur dioxide sensor, a methane sensor, a carbon monoxide sensor, a carbon dioxide sensor, a nitrogen dioxide sensor and a toluene sensor are usually installed in the gas detection chamber 3 . The above-mentioned sensors are all electrochemical sensors, including internal resonators and high-sensitivity gas adsorption films laid on the outside, which can generate corresponding resonant waves according to the gas type and concentration, and respond according to the resonant frequency and resonant peak size, so as to judge the gas type and concentration. Specifically, when the detected gas passes through the area where the sensor is located, different sensors are only sensitive to one of the gases and react, and can generate an electrical signal proportional to the gas concentration, thereby determining the gas type. The sensitive gas first passes through the hydrophobic barrier, reaches the surface of the sensing electrode and undergoes a redox reaction, and then forms a current proportional to the concentration of the measured gas under the action of the resistor connected between the electrodes, and flows between the positive and negative electrodes. By measuring the magnitude of this current, the gas concentration can be determined. It has the characteristics of sensitive response and high precision. In order to facilitate assembly and replacement, the above-mentioned sensors are usually of the plug-and-play type. Correspondingly, a plurality of matching installation slots are provided on the bottom plate of the gas detection chamber 3 . The casing 1 is also provided with a movable transparent cover plate corresponding to the position of the gas detection chamber 3, which is convenient for replacing waste sensors.

Table 1 Parameters of each sensor

As shown in Figure 2, the signal output terminals of the above-mentioned temperature sensor 7, miniature camera 8, rangefinder 9, hydrogen sulfide sensor, sulfur dioxide sensor, methane sensor, carbon monoxide sensor, carbon dioxide sensor, nitrogen dioxide sensor and toluene sensor are respectively connected with the single-chip microcomputer The signal input end of the single-chip microcomputer is electrically connected to the signal input end of the liquid crystal display 11 .

A molecular sieve adsorption layer, a chemical adsorption cotton layer and an activated carbon layer are sequentially arranged in the gas adsorption box 4 along the gas flow direction. Specifically, the molecular sieve adsorption layer is an adsorption bag with a built-in zeolite molecular sieve, which can effectively absorb irritating gases such as aromatics, alkanes, and sulfides under high temperature conditions; the chemical adsorption cotton layer is filled with petroleum ether, ethyl acetate, and carbon tetrachloride. The sponge of the mixed solution of the solution can have a chemical reaction with the irritating gas to achieve an adsorption effect, and at the same time have a cooling effect on the high-temperature gas, which is beneficial to the activated carbon in the activated carbon layer to further absorb the residual harmful components of the gas. After the above-mentioned three-stage adsorption treatment, the irritating odor gas of rubber asphalt can meet the standard of safe discharge.

The gas pump 2 can automatically adjust the power according to the gas concentration, so as to control the flow rate of the detected gas into the gas detection chamber 3 . An indicator light 12 and a buzzer 13 for displaying the detection state are also installed on the housing 1 . Under normal circumstances, the indicator light 12 is divided into three colors of yellow, green, and red, which respectively represent the three states of standby, detection, and failure. The working status of the instrument. The housing 1 is provided with a rechargeable power supply battery pack 14, which can effectively improve the portability of the device.

For ease of use, a fixing mechanism is provided on the back of the housing 1. Specifically, the fixing mechanism is a folding bracket or an adhesive strap, which can be placed on the top of the heating storage tank or wrapped around the operator's arm to carry around. A transparent silicone protective cover can also be provided on the outside of the casing 1, which can effectively protect the equipment in terms of waterproof and moisture-proof.

During detection, the harmful gas in the rubber asphalt heating storage tank M enters the gas detection chamber 3 under the action of the air pump 2, and the gas sensor analyzes the gas composition and content first, and then transmits the result to the liquid crystal display 11, and then, the gas Enter the gas adsorption box 4, where the harmful components are absorbed by the gas adsorbent and then evacuated harmlessly. Specific steps are as follows:

The first step is to check the airtightness of the connection between the intake pipe 5 and the air pump 2 and the trumpet-shaped air collection port 6. After ensuring that there is no air leakage, turn on the machine and preheat for 3-5 minutes. At this time, the yellow indicator light 12 on the housing is on. , accompanied by a short sound of the buzzer 13, indicating that the device is in standby and preheating state;

In the second step, after checking and adjusting the detection parameters of the analyzer, place the air intake pipe 5 in the rubber asphalt heating storage tank M, observe the gas distribution in the tank through the micro camera 8, and place the horn-shaped gas collection port 6 in the gas concentration Relatively moderate position, at the same time make the trumpet-shaped gas collection port 6 located 20-50cm below the tank mouth, start the air pump 2 to suck the gas for 3-5 minutes, the gas detection chamber 3 is filled with the liquid produced by rubber asphalt, at this time, the shell The yellow indicator light 12 on the screen goes out, the green indicator light 12 lights up, and the buzzer 13 makes two short beeps, indicating that the device is in the detection state. After the detection data of each gas content on the liquid crystal display 11 is stable, record the detection result;

The third step is to pull the air intake pipe 5 out of the rubber asphalt heating storage tank M so that the trumpet-shaped gas collection port 6 is located in the fresh air, and keep the air pump 2 pumping for 5-10 minutes, and when the gas display value of the instrument drops below 10 units , before shutting down to prevent loss caused by sensor "poisoning".

So far, the detection process is completed.

Claims (10)

1. a kind of gas analyzer for detecting rubber asphalt pungent odour ingredient, it is characterised in that：Including shell（1）, The shell（1）Inside it is provided with the air pump that gas-guide tube is sequentially communicated（2）, gas-detecting cavity（3）With gas adsorption box（4）, The air pump（2）Import oriented shell is connected to by universal joint（1）The air inlet pipe that outside extends（5）, the air inlet pipe（5） Head be provided with tubaeform collection gas port（6）, the tubaeform collection gas port（6）On be provided with temperature sensor（7）, miniature video camera Machine（8）And rangefinder（9）, the gas-detecting cavity（3）Hydrogen sulfide sensor, SO 2 sensor, methane is inside provided with to pass Sensor, carbon monoxide transducer, carbon dioxide sensor, nitrogen dioxide sensor and Toluene Gas Sensor, the gas absorption box （4）It is interior to be disposed with molecular sieve adsorption layer, chemisorption cotton layer and active carbon layer, gas absorption box along gas flow（4）'s Outlet, which has, leads to shell（1）External exhaust pipe（10）；Shell（1）It is provided on front panel for showing testing result Liquid crystal display（11）, shell（1）The back side is provided with fixed mechanism；The temperature sensor（7）, microcam（8）, ranging Instrument（9）, hydrogen sulfide sensor, SO 2 sensor, methane transducer, carbon monoxide transducer, carbon dioxide sensor, two The signal output end of nitrogen oxide sensor and Toluene Gas Sensor is electrically connected with the signal input part of microcontroller respectively, the microcontroller Signal output end and liquid crystal display（11）Signal input part electrical connection.

2. the gas analyzer according to claim 1 for detecting rubber asphalt pungent odour ingredient, feature exists In：The gas-guide tube and exhaust pipe（10）It is anti-corrosion hose.

3. the gas analyzer according to claim 1 for detecting rubber asphalt pungent odour ingredient, feature exists In：The air inlet pipe（5）For anti-corrosion telescoping tube.

4. the gas analyzer according to claim 1 for detecting rubber asphalt pungent odour ingredient, feature exists In：The hydrogen sulfide sensor, SO 2 sensor, methane transducer, carbon monoxide transducer, carbon dioxide sensor, Nitrogen dioxide sensor and Toluene Gas Sensor are plug and play type electrochemical sensor.

5. the gas analyzer according to claim 1 for detecting rubber asphalt pungent odour ingredient, feature exists In：The shell（1）It is provided on front panel and gas-detecting cavity（3）The corresponding movable transparent cover plate in position.

6. the gas analyzer according to claim 1 for detecting rubber asphalt pungent odour ingredient, feature exists In：The shell（1）The indicator light for display working condition is provided on front panel（12）And buzzer（13）.

7. the gas analyzer according to claim 1 for detecting rubber asphalt pungent odour ingredient, feature exists In：The shell（1）Inside it is provided with rechargeable supplying cell group（14）.

8. the gas analyzer according to claim 1 for detecting rubber asphalt pungent odour ingredient, feature exists In：The shell（1）Outside is provided with transparent flexible protective case.

9. the gas analyzer according to claim 1 for detecting rubber asphalt pungent odour ingredient, feature exists In：The fixed mechanism is folding bracket or adhesive type bandage.

10. the method for gas analyzer detection rubber asphalt pungent odour ingredient according to claim 1, feature exist In：Include the following steps：

The first step checks air inlet pipe（5）With air pump（2）, tubaeform collection gas port（6）Connection air-tightness, it is ensured that without gas leak phenomenon Afterwards, booting preheating 3-5 minutes；

Second step, by air inlet pipe（5）It stretches into rubber asphalt heating storage tank, and makes tubaeform collection gas port（6）Positioned at tank mouth with Lower 20-50cm, starts air pump（2）After intake-gas 3-5 minutes, liquid crystal display is recorded（11）On testing result；

Third walks, by air inlet pipe（5）It detaches outside rubber asphalt heating storage tank, makes tubaeform collection gas port（6）Positioned at fresh air In, keep air pump（2）Detection process is completed in suction 5-10 minutes, shutdown.