Water vapor interference simulation device for infrared gas analyzer

Abstract

A water vapor interference simulation device for an infrared gas analyzer belongs to the technical field of auxiliary detection equipment and comprises bottled gas, a flow sensor, a pressure sensor, a temperature sensor, a humidity sensor, a voltage display meter, a valve, a bottom plate, steam generation equipment, a voltage regulation module and a gas generation tube. Bottled gas, a flow sensor, a pressure sensor, a temperature sensor, a humidity sensor, a voltage display meter, a valve, steam generating equipment and a voltage adjusting module are included, a gas generating pipe is installed on a bottom plate, and each set of steam generating equipment comprises a heating cylinder, an electric heating pipe, a safety valve, a water adding pipe and a liquid level switch. The device has a compact structure, is convenient to use, can synchronously input gases obtained by uniformly mixing water vapor with nitrogen or carbon monoxide gas at different temperatures and different concentrations into the infrared gas analyzer under the combined action of related structures, and plays a favorable technical support for multi-mode calibration of performance data of the infrared gas analyzer.

Description

TECHNICAL FIELD

[0001] The utility model relates to the auxiliary equipment technical field that gas concentration analyzer used, especially a simulation water vapor interference device for infrared gas analyzer. BACKGROUND

[0002] The automobile using traditional energy as fuel (such as gasoline, diesel, natural gas etc.), its work will produce a large amount of carbon monoxide (CO), nitrogen monoxide (NO), nitrogen dioxide (NO2), methane (CH4), propane (C3H8) and a large amount of carbon dioxide (CO2) etc. Gaseous pollutant. Therefore in the development, maintenance stage of engine, and subsequent vehicle life stage, need to reduce the emission amount of gaseous pollutant as far as possible. Therefore, through the automobile exhaust detection analyzer to the emission pollutant of automobile is detected, subsequent according to the result of detection in time handles exhaust fault, reduces the emission amount of pollution exhaust gas is very important, wherein, based on the analyzer of infrared principle or chemiluminescence principle to the exhaust gas is detected due to the relatively accurate detection data, convenient detection, its application is more.

[0003] The exhaust gas discharged from the automobile exhaust includes not only gas but also water vapor, etc. The water vapor will interfere with the important detection data of carbon monoxide and nitrogen oxides of the infrared gas analyzer. When the analyzer is abnormal in performance due to various reasons and is affected by water vapor, the detection data of carbon monoxide and nitrogen oxides will deviate. Specifically, the reasons why water vapor has adverse effects on the detection data of carbon monoxide and nitrogen oxides of the infrared gas analyzer with abnormal performance are as follows. (1) Water molecules have strong absorption peaks in the infrared region, especially near 2.9 µm and 6.1 µm, which will interfere with the absorption peaks of the target gas and affect the detection accuracy; (2) In a humid environment, water vapor may condense on the surface of optical elements, affecting the transmission and reflection of infrared light and reducing the performance of the instrument; (3) Changes in environmental temperature and humidity will affect the absorption characteristics of water vapor, causing fluctuations in measurement results, especially under high temperature and humidity conditions; (4) The absorption peaks of some gases in the exhaust are close to those of water, which may cause cross interference and further affect the measurement accuracy. In view of the above factors, in the prior art, in order to ensure the detection accuracy of the infrared gas analyzer for the important carbon monoxide and nitrogen oxides data in the exhaust gas of the vehicle, the quality supervision department needs to use a calibration device to calibrate the detection performance of the automobile infrared gas analyzer. The calibration device is essentially a water vapor generating device (also known as a water vapor interference device) and a carbon monoxide bottle or a nitrogen bottle. During calibration, the water vapor generated by the water vapor generating device and the nitrogen or carbon monoxide gas are input into the infrared gas analyzer through a three-way pipe connected in parallel to the gas inlet pipe of the analyzer. Then, the calibration personnel compare the nitrogen or carbon monoxide gas concentration data displayed by the analyzer (the corresponding gas is discharged from the analyzer exhaust pipe after detection) with the actual input nitrogen or carbon monoxide gas concentration (i.e. flow rate) data, and then determine whether the detected infrared gas analyzer is working normally (if the concentration data obtained by detection is close to the corresponding gas concentration data output by the carbon monoxide bottle or the nitrogen bottle, it means normal, otherwise, the concentration data is too high or too low, which means abnormal). Although the existing water vapor generating device and carbon monoxide bottle or nitrogen bottle cooperative method can meet the calibration requirements of the infrared gas analyzer to some extent, due to the limitations of the structure, there are still the following technical defects.Firstly, water vapor and nitrogen or carbon monoxide gas are respectively introduced into the infrared gas analyzer, and the two are not mixed in advance, the space in the gas inlet pipe of the infrared gas analyzer is relatively small, the flow path is short, and the water vapor cannot be effectively mixed with the gas and introduced into the probe detection part of the infrared gas analyzer, which will more or less adversely affect the true reflection of the calibration data; secondly, the amount of steam introduced into the gas inlet pipe by the water vapor interference device is affected by the heating temperature, that is, the amount of steam generated after water heating is relatively low when the heating temperature does not increase, which cannot support the calibration of the performance of the infrared gas analyzer based on high-concentration steam, and the data obtained by the infrared gas analyzer calibration is relatively limited, which cannot guarantee the real and effective data of the infrared gas analyzer in the actual high-concentration steam environment. Content of the utility model

[0004] In order to overcome the disadvantages of the existing water vapor interference device for infrared gas analyzer due to the limitation of structure, the utility model improves the compact structure and convenient use, and under the joint action of the related structure, can synchronously input the gas mixed with water vapor and nitrogen or carbon monoxide gas with different temperatures and different concentrations into the infrared gas analyzer, and provides technical support for the multi-mode calibration of the performance data of the infrared gas analyzer.

[0005] The technical scheme adopted by the application to solve the technical problems is:

[0006] The utility model provides an analog water vapor interference device for infrared gas analyzer, including bottled gas, flow sensor, pressure sensor, temperature sensor, humidity sensor, voltage display table, valve, bottom plate, vapor generating equipment, voltage regulation module, gas generating pipe, vapor generating equipment, bottled gas respectively have at least two sets, every vapor generating equipment includes heating cylinder, electric heating pipe, safety valve, water adding pipe, liquid level switch, heating cylinder lower end installs heating shell, electric heating pipe installs in heating shell, liquid level switch installs in heating cylinder inside lower end, safety valve air inlet pipe, water adding pipe lower end installs on heating cylinder upper end outside, bottled gas, two vapor generating equipment's heating cylinder installs on the bottom plate respectively, gas generating pipe has at least two, valve, flow sensor respectively has many, two bottled gas's air outlet pipe and one end of two valves are connected respectively, the other end of two valves and the air inlet of two flow sensors are connected respectively, the air outlet of two flow sensors and one end of first gas generating pipe are connected in parallel, the other end of first gas generating pipe installs on the upper end of the heating cylinder of first vapor generating equipment, one end of second gas generating pipe installs on the upper end of the heating cylinder of first vapor generating equipment outside one side, the other end of second gas generating pipe installs on the upper end of the heating cylinder of second vapor generating equipment, the upper side of the heating cylinder of second vapor generating equipment installs the mixing pipe, the other end of mixing pipe and the air inlet of second flow sensor are connected, the air outlet of second flow sensor and one end of third valve are connected, the other end of third valve and the air inlet pipe of infrared gas analyzer are connected, the air inlet pipe of pressure sensor and the probe of humidity sensor, temperature sensor are installed on the upper end outside of mixing pipe, voltage regulation module, humidity sensor and the host of temperature sensor, voltage display table install in electric control box, the signal output end of liquid level switch of vapor generating equipment, pressure sensor, temperature sensor, humidity sensor and the power input end of many voltage display tables are electrically connected.

[0007] Further, the two bottled gases respectively contain nitrogen and carbon monoxide.

[0008] Further, the lower end of the second gas generating pipe is provided with a jet pipe, and the lower end of the jet pipe is provided with a plurality of jet holes.

[0009] Further, the heating surface of the electric heating pipe is tightly attached to the lower outer end of the heating cylinder.

[0010] Further, the outer side end and the outer upper end of the heating cylinder are respectively provided with heat insulation materials.

[0011] Further, distilled water is added into the heating cylinders of the two sets of vapor generating equipment through the water adding pipes.

[0012] Further, a sealing cover is installed on the upper end of the water adding pipe.

[0013] The utility model has the advantages that: compared with the prior art, the utility model has the advantages that: the utility model is compact in structure and convenient to use, and can independently control carbon monoxide and nitrogen gas of different flow rates or synchronously control a mixture of carbon monoxide and nitrogen gas of different flow rates and water vapor of different concentrations and temperatures to enter an infrared gas analyzer for detection, analysis and calibration. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a structural schematic diagram of the utility model.

[0015] Figure 2 is a circuit diagram of the utility model. DETAILED DESCRIPTION

[0016] Figure 1 , 2As shown, an infrared gas analyzer with analog water vapor interference device, including bottled gas 1, power module A1, flow sensor A2, A3, A4, pressure sensor A5, temperature sensor A6, humidity sensor A7, LCD voltage display V1, V2, V3, V4, V5, valve 21, 22, 23, bottom plate 3, steam generating equipment 4, voltage regulation module A8, gas generating tube 51 and 52, the steam generating equipment 4, bottled gas 1 has two sets respectively, each set of steam generating equipment includes heating cylinder 41, electric heating tube 42 (RT), safety valve 43 (discharge high pressure in the heating cylinder), water pipe 44, liquid level switch A9, the outer sealing welding of the lower end of the heating cylinder 41 has a hollow heating shell 45, the electric heating tube 44 (RT) is fixedly installed in the heating shell 45, the support frame of the liquid level switch A9 (and the wire connected thereto is led out outwardly via the left end opening of the heating barrel, and the opening is sealed with heat-resistant sealing glue) is fixedly installed in the lower left end of the heating cylinder 41, the safety valve 43 inlet pipe and the lower end of the water pipe 44 are fixedly installed on the upper middle part of the heating cylinder 41, and the inlet pipe and the lower end of the water pipe are communicated with the inside of the heating cylinder 41; the heating cylinder 41 of the two sets of bottled gas 1 and the two sets of steam generating equipment are fixedly installed on the bottom plate 3 from left to right in turn, the gas generating tube has two, the valve and the flow sensor have three, the gas outlet pipe of the two bottled gas 1 and one end of the two valves 21 and 22 are respectively connected by screw thread, the other end of the two valves 21 and 22 and the gas inlet of the two flow sensors A2 and A3 are respectively connected by pipeline, the gas outlet of the two flow sensors A2 and A3 and the first end and the second end of a three-way pipe are respectively connected by pipeline, the third end of the three-way pipe and one end of the first gas generating tube 51 are connected by screw thread; the middle part of the first gas generating tube 51 is welded on the upper middle part of the heating cylinder 41 of the first set of steam generating equipment outside and the lower end thereof is located at the lower end (more than 5mm position) of the heating cylinder 41, one end of the second gas generating tube 52 is welded on the upper end of the heating cylinder 41 of the first set of steam generating equipment outside the right side, the middle part of the second gas generating tube 52 is welded on the upper middle part of the heating cylinder 41 of the second set of steam generating equipment outside and the lower end thereof is located at the lower end (more than 5mm position) of the heating cylinder 41; the upper end of the heating cylinder of the second set of steam generating equipment is welded with a mixing pipe 6, the other end of the mixing pipe 6 and the gas inlet of the third set of flow sensor A4 are connected by screw thread, the gas outlet of the third set of flow sensor A4 and a branch pipe 7 are connected by screw thread, the other end of the branch pipe 7 and one end of the third valve 23 are connected by screw thread, the other end of the third valve 23 and the gas inlet pipe of the infrared gas analyzer (not shown in the figure) are connected by hose, the gas inlet pipe of the pressure sensor A5 is fixedly installed on the upper end of the mixing pipe 6 and the gas inlet pipe and the mixing pipe 6 are communicated, the upper end of the mixing pipe 6 has two openings, the probes of the humidity sensor A7 and the temperature sensor A6 are respectively sealedly installed in the upper end of the mixing pipe 6 through the two openings;The power module A1, voltage regulation module A8 (handle located in the front of the electrical control box opening outside), humidity sensor A7 and temperature sensor A6 host, five liquid crystal voltage display installed in the electrical control box 8, electrical control box 8 installed on the left end of the bottom plate. Five voltage display interface is located in the front of the electrical control box outside the end.

[0017] Figure 1 、 2 As shown, two bottles of gas 1 respectively has carbon monoxide and nitrogen. The lower end of the second gas generating tube 52 is longitudinally welded with a gas jet pipe 53, and the lower end of the gas jet pipe has a plurality of gas jet holes 531. The heating surface of the electric heating tube 42 is tightly attached to the outer lower end of the heating cylinder 41. The outer side and upper end of the heating cylinder 41 are respectively provided with heat insulation aluminum silicate fiber (heat preservation effect). The heating cylinder of the two sets of steam generating equipment is added with distilled water through the water adding pipe 44. The upper end of the water adding pipe 44 is provided with a sealing cover (to prevent steam from escaping) through screw thread. The power input terminals 1 and 2 of the power module A1, the power input terminals 1 and 2 of the voltage regulation module A8 and the two poles of the AC 220V power supply are respectively connected through wires. The power output terminals of the voltage regulation module A8 and the power input terminals of the electric heating tube RT of the two sets of steam generating equipment are respectively connected through wires. The power output terminals 3 and 4 of the power module A1 and the power input terminals 1 and 2 of the three sets of flow sensors A2, A3 and A4, the power input terminals 1 and 2 of the pressure sensor A5, the power input terminals 1 and 2 of the temperature sensor A6, the power input terminals 1 and 2 of the humidity sensor A7 are respectively connected through wires (the 3 terminals of the power module and the 1 terminal of the two liquid level switches A9 are connected through wires). The power output terminals 2 of the two sets of steam generating equipment liquid level switch A9 and the power output terminals 4 of the power module A1, the power output terminals 3 and 2 of the pressure sensor A5, the power output terminals 3 and 2 of the temperature sensor A6, the power output terminals 3 and 2 of the humidity sensor A6 and the power input terminals of the five liquid crystal voltage display V4, V5, V1, V2 and V3 are respectively connected through wires.

[0018] Figure 1 、 2As shown, after the 220V power supply enters the power input terminals of the power module A1 and the voltage regulation module A8, the relevant modules are powered on and work. The application process of this new type is as follows. (1) Add distilled water into the heating cylinders of the two sets of steam generating equipment 4 through the water adding pipe, then tighten the sealing cap, and turn on the power switch of the voltage regulation module A8 (the output voltage can be adjusted). When the voltage output of the voltage regulation module A8 to the power input terminal of the electric heating tube 42 (RT) of the two sets of steam generating equipment is high, the heat generated by the electric heating tube 42 is relatively high, and the steam pressure and concentration of the water after boiling in the subsequent heating cylinder 41 are relatively high. Conversely, the steam pressure and concentration of the water after boiling in the subsequent heating cylinder 41 are relatively low. (2) After the water in the heating cylinders of the two steam generators boils, the calibrator opens the corresponding valves 22 or 21 of the nitrogen cylinder or carbon monoxide cylinder. In this way, the nitrogen, carbon monoxide or nitrogen and carbon monoxide mixture (hereinafter referred to as gas) output from the nitrogen cylinder or carbon monoxide cylinder will flow rapidly into the heating cylinder of the first steam generator through the first gas generating pipe 51. After the high-speed flowing gas impacts the water in the heating cylinder, it mixes with the steam generated in the heating cylinder (initially generating a gas and steam mixture) and flows rapidly into the heating cylinder of the second steam generator through the second gas generating pipe 52. The high-speed flowing gas is rapidly ejected from multiple jet holes 531 at the lower end of the jet pipe. The gas mixed with steam impacts the water in the heating cylinder, mixes with the steam generated in the heating cylinder, and flows out through the mixing pipe 6 (generating a gas and steam mixture again, increasing the steam concentration in the gas). Then, it enters the infrared gas analyzer through the flow sensor A4 and the valve 23 opened by the valve core for detection, analysis and calibration. Specifically, flow sensors A2 and A3 display higher signals on their screens when the output of carbon monoxide or nitrogen is higher, and vice versa. This allows calibrators to adjust the output flow rate (concentration) of carbon monoxide or nitrogen based on the concentration (flow rate) signal, which represents the amount of carbon monoxide or nitrogen. Similarly, flow sensor A4 displays a higher pressure signal on its screen when the output of a mixture of carbon monoxide or nitrogen and steam is higher, and vice versa. This allows calibrators to adjust the output flow rate (concentration) of a mixture of carbon monoxide or nitrogen and steam based on the concentration (flow rate) signal, enabling the infrared gas analyzer to perform detection and analysis based on a suitable flow mixture. In this new invention, the higher the pressure of the mixed water vapor, the higher the voltage signal output from pins 3 and 2 of the pressure sensor A5 to the voltmeter V1; conversely, the lower the pressure, the lower the voltage signal output to the voltmeter V1. In this way, the calibration personnel can understand the gas pressure data of the mixed water vapor entering the analyzer based on the data displayed on the voltmeter V1.The higher the temperature of the mixed water vapor, the higher the voltage signal output from pins 3 and 2 of temperature sensor A6 to voltmeter V2; conversely, the lower the temperature, the lower the voltage signal output to voltmeter V2. This allows calibration personnel to determine the temperature of the mixed water vapor entering the analyzer based on the data displayed on voltmeter V2. Similarly, the higher the humidity of the mixed water vapor, the higher the voltage signal output from pins 3 and 2 of humidity sensor A7 to voltmeter V3; conversely, the lower the humidity, the lower the humidity. This allows calibration personnel to determine the humidity of the mixed water vapor entering the analyzer based on the data displayed on voltmeter V7. (When the nitrogen and carbon dioxide flow rate data displayed by the first and second flow sensors are close to the concentration data detected by the analyzer (a higher flow rate results in a higher concentration, and vice versa), the analyzer is functioning normally; conversely, excessively high or low data indicate malfunction.) When the water level in the heating cylinder is not lower than the minimum threshold, and the water level in one or more heating cylinders is appropriate, the float of the level switch A9 in one or more heating cylinders will rise, and its two internal contacts will open. Correspondingly, one or two voltmeters V4 and V5 will not be energized, indicating that the corresponding heating cylinder is not short of water. When the water level in the heating cylinder is lower than the minimum threshold, and the water level in one or more heating cylinders is inappropriate, the float of the level switch A9 in one or more heating cylinders will descend, and its two internal contacts will close. Correspondingly, one or two voltmeters V4 and V5 will be energized and display a voltage signal, indicating that the corresponding heating cylinder is short of water and needs to be refilled.

[0019] Figure 1 , 2 As shown, through the above technical solution, this new invention has the advantages of compact structure and convenient use. It can individually control carbon monoxide and nitrogen at different flow rates, or simultaneously control a mixture of carbon monoxide and nitrogen at different flow rates and water vapor of different concentrations, temperatures, pressures, and humidity, which are then uniformly mixed before entering the infrared gas analyzer for detection, analysis, and calibration. Specifically, because it has two sets of steam generating equipment, the water vapor generated by the first set of steam generating equipment mixes with the corresponding nitrogen or carbon monoxide, and the water vapor generated by the second set of steam generating equipment mixes with the nitrogen or carbon monoxide again, increasing the water vapor concentration in the corresponding gas (and the concentration of water vapor can also be adjusted by adjusting the heating temperature of the electric heating tube through the voltage regulation module), which provides favorable technical support for multi-mode calibration of the performance data of the infrared gas analyzer. Figure 2In the diagram, power module A1 is a finished product of AC 220V to DC 12V power module; voltmeters V1-V5 are LCD voltage display meters with a DC 12V range; the electric heating element is a finished product of stainless steel armored dry-burning electric heating element with a power of 3KW; pressure sensor A5 is a finished product of pressure transmitter model RLP131M-V, which has two power input terminals and one signal power output terminal (negative power input terminal, signal output terminal outputs positive and negative voltage signals); flow sensors A2, A3, and A4 are finished products of electromagnetic vortex flow meters, which have two power input terminals and their own flow display screen; temperature sensor A6 is... The SGN-HR temperature sensor is a finished product with two power input terminals and one signal power output terminal (negative power input terminal and signal output terminal outputting positive and negative voltage signals); the A9 level switch is a float-type normally closed contact water level switch with one power input terminal and one power output terminal; the A7 humidity sensor is a KS-SHTE humidity sensor with two power input terminals and one signal power output terminal (negative power input terminal and signal output terminal outputting positive and negative voltage signals); the voltage regulation module is an AC stepless voltage regulator with an input voltage of 220V AC and an output power of 8KW.

[0020] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model.

[0021] Furthermore, it should be understood that although this specification describes the embodiments, the embodiments do not necessarily contain only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A simulated water vapor interference device for an infrared gas analyzer, comprising bottled gas, a flow sensor, a pressure sensor, a temperature sensor, a humidity sensor, a voltage display, a valve, a base plate, a steam generator, a voltage regulation module, and a gas generating tube, characterized in that, The steam generating equipment and bottled gas are provided in at least two sets. Each set of steam generating equipment includes a heating cylinder, an electric heating element, a safety valve, a water supply pipe, and a level switch. A heating shell is installed at the lower end of the heating cylinder, the electric heating element is installed inside the heating shell, and the level switch is installed at the lower end of the heating cylinder. The lower ends of the safety valve inlet pipe and the water supply pipe are respectively installed outside the upper end of the heating cylinder. The bottled gas and the heating cylinders of the two sets of steam generating equipment are respectively installed on a base plate. There are at least two gas generating pipes, and multiple valves and flow sensors. The outlet pipes of the two bottled gases are connected to one end of two of the valves, and the other ends of the two valves are connected to the inlets of two of the flow sensors. The outlets of the two flow sensors are connected in parallel to one end of the first gas generating pipe. The other end of the first gas generating pipe is installed on the upper end of the heating cylinder of the first set of steam generating equipment. One end of the second gas generating tube is installed on the outer side of the upper end of the heating cylinder of the first steam generating equipment, and the other end of the second gas generating tube is installed on the upper end of the heating cylinder of the second steam generating equipment. A mixing tube is installed on the upper side of the heating cylinder of the second steam generating equipment. The other end of the mixing tube is connected to the air inlet of the second flow sensor. The exhaust port of the second flow sensor is connected to one end of the third valve. The other end of the third valve is connected to the air inlet of the infrared gas analyzer. The air inlet pipe of the pressure sensor and the probes of the humidity sensor and temperature sensor are respectively installed on the outer side of the upper end of the mixing tube. The main unit of the voltage regulation module, the humidity sensor and the temperature sensor, and the voltage display meter are installed in the electrical control box. The signal output terminals of the liquid level switch, pressure sensor, temperature sensor and humidity sensor of the steam generating equipment are electrically connected to the power input terminals of multiple voltage display meters.

2. The simulated water vapor interference device for an infrared gas analyzer according to claim 1, characterized in that, The two bottles contain nitrogen and carbon monoxide gas, respectively.

3. The simulated water vapor interference device for an infrared gas analyzer according to claim 1, characterized in that, The lower end of the second gas generating tube is equipped with a jet pipe, which has multiple jet holes at the lower end.

4. The simulated water vapor interference device for an infrared gas analyzer according to claim 1, characterized in that, The heating surface of the electric heating element is in close contact with the lower outer end of the heating cylinder.

5. The simulated water vapor interference device for an infrared gas analyzer according to claim 1, characterized in that, Insulation material is installed on the outer and upper ends of the heating cylinder.

6. The simulated water vapor interference device for an infrared gas analyzer according to claim 1, characterized in that, Distilled water is added to the heating cylinders of both steam generators via water inlet pipes.

7. The simulated water vapor interference device for an infrared gas analyzer according to claim 6, characterized in that, A sealing cap is installed at the top of the water inlet pipe.

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