CN115615926A - Nitrogen oxide analyzer - Google Patents

Nitrogen oxide analyzer Download PDF

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Publication number
CN115615926A
CN115615926A CN202211110142.4A CN202211110142A CN115615926A CN 115615926 A CN115615926 A CN 115615926A CN 202211110142 A CN202211110142 A CN 202211110142A CN 115615926 A CN115615926 A CN 115615926A
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China
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gas
detected
outlet
reaction chamber
measured
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CN202211110142.4A
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Chinese (zh)
Inventor
李保生
张斌
杜亚举
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Hefei Ftun Optoelectronics Technology Co ltd
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Hefei Ftun Optoelectronics Technology Co ltd
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Priority to CN202211110142.4A priority Critical patent/CN115615926A/en
Publication of CN115615926A publication Critical patent/CN115615926A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/04—Arrangement or mounting of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0388—Arrangement of valves, regulators, filters
    • F17C2205/0394—Arrangement of valves, regulators, filters in direct contact with the pressure vessel
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/12—Circuits of general importance; Signal processing
    • G01N2201/127—Calibration; base line adjustment; drift compensation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

The invention discloses a nitrogen oxide analyzer, which comprises a reaction chamber, a photomultiplier arranged in the reaction chamber, a signal processor in signal connection with the photomultiplier, and a gas input device to be detected and an ozone input device which are connected with the reaction chamber, wherein the gas input device to be detected comprises a double-layer pipe, a five-way valve, a gas temporary storage tank to be detected and a molybdenum furnace which are sequentially arranged; the nitrogen oxide analyzer effectively ensures that the contents of the gas to be detected are the same when the total amounts of NO and nitrogen are detected and calculated.

Description

Nitrogen oxide analyzer
Technical Field
The invention belongs to the field of gas monitoring and detection, and particularly relates to a nitrogen oxide analyzer.
Background
Because NO is unstable, NO is quickly converted into NO in the air by the action of ultraviolet rays and ozone 2 To produce stimulation. Nitrogen oxides mainly damage respiratory tracts, and only have slight eye and respiratory tract irritation symptoms at the initial stage of inhalation, such as pharyngeal discomfort, dry cough and the like. Delayed pulmonary edema, adult respiratory distress syndrome, chest distress, respiratory distress, cough, foamy sputum, cyanosis, pneumothorax and mediastinal emphysema can occur together, and delayed obstructive bronchiolitis can occur about two weeks after pulmonary edema subsides. High NO concentration can cause diseases such as methemoglobinemia and the like, and seriously affect the health and the life of organisms such as human bodies and the like.
In the prior art, in many places, the content of NO or nitrogen oxide needs to be monitored, and the content of NO or nitrogen oxide in gas needs to be strictly controlled and mastered so as to ensure that the NO or nitrogen oxide is absorbed, eliminated or converted, and avoid harm to human bodies or organisms. The prior art detection or monitoring of NO has primarily utilized UV detection methods, i.e., conversion of NO to excited NO upon excessive ozone oxidation 2 Excited state of NO 2 NO returning to ground state 2 In the process, light with the wavelength of 600-1200nm is emitted, and NO is judged by detecting a light intensity signal through a photomultiplier 2 The NO content is calculated.
In the prior art, nitrogen oxide detection equipment is complex in structure, and in detection, the inconvenience of gas content detected in the same group of data which is calculated is difficult to ensure, and the detection precision and the monitoring instantaneity are influenced.
Disclosure of Invention
The invention aims to provide a nitrogen oxide analyzer which can effectively ensure that the content of gas to be detected is the same when the total content of NO and nitrogen is detected and calculated.
The invention provides a nitrogen oxide analyzer, which comprises a reaction chamber, a photomultiplier arranged in the reaction chamber, a signal processor in signal connection with the photomultiplier, and a gas input device to be detected and an ozone input device which are connected with the reaction chamber, wherein the gas input device to be detected comprises a double-layer pipe, a five-way valve, a gas temporary storage tank to be detected and a molybdenum furnace which are sequentially arranged, the gas temporary storage tank to be detected comprises a sealing tank body and a pressure membrane arranged in the sealing tank body, the pressure membrane divides the sealing tank body into a gas area to be detected and a pressure gas area, the gas area to be detected is connected with a gas inlet to be detected and a gas outlet to be detected, the pressure gas area is connected with a pressure gas inlet and a pressure gas outlet, the five-way valve and the molybdenum furnace are respectively connected with the gas inlet to be detected and the gas outlet to be detected, and the pressure gas inlet and the pressure gas outlet are respectively connected with a pressure gas inlet pump and a pressure gas exhaust valve.
Preferably, the double-layer pipe comprises an inner pipe and an outer pipe, an inner pipe air inlet and an inner pipe air outlet are respectively arranged at two ends of the inner pipe, an outer pipe air inlet for inputting balance gas into the outer pipe is connected to the outer pipe, the inner pipe air outlet is communicated with the five-way valve, gas to be measured is input into the five-way valve, and the inner pipe air inlet is communicated with a gas input pump to be measured.
Preferably, the exhaust port of the gas input pump to be measured is connected with a first oxidation filter and a first air duct which are connected in parallel, and the air outlet of the first oxidation filter and the end part of the first air duct far away from the gas input pump to be measured are both communicated with the air inlet of the inner tube on the inner tube of the double-layer tube.
Preferably, the five-way valve comprises a main air inlet communicated with an inner tube air outlet on an inner tube of the double-layer tube, a first air outlet communicated with an air inlet to be detected of the sealed tank body, a second air outlet communicated with the ozone input device, a third air outlet communicated with an outer tube air inlet on an outer tube of the double-layer tube, and a fourth air outlet communicated with the external environment.
Preferably, the molybdenum furnace comprises a furnace body, a molybdenum heating wire arranged in the furnace body, and a molybdenum furnace gas inlet and a molybdenum furnace gas outlet which are arranged on the furnace body, wherein the molybdenum furnace gas inlet is connected with the gas outlet to be detected of the sealed tank body, and the molybdenum furnace gas outlet is communicated with the reaction chamber; and the furnace body is also internally provided with an air guide coil pipe, and two ends of the air guide coil pipe respectively extend out of the furnace body and are respectively communicated with a waste gas outlet of the reaction chamber and the external environment.
Preferably, the gas outlet to be measured of the sealed tank body is further connected with a second gas guide tube, the second gas guide tube is connected with the molybdenum furnace in parallel, and the other end of the second gas guide tube is communicated with the reaction chamber.
Preferably, the ozone input device comprises a second oxidation filter and an ozone generator which are sequentially arranged, an air inlet of the second oxidation filter is connected with a second air outlet of the five-way valve, and an air outlet of the ozone generator is communicated with the reaction chamber.
Preferably, the waste gas outlet of the reaction chamber is connected with the gas inlet of a second oxidation filter, and the gas outlet of the second oxidation filter is communicated with one end of a gas guide coil in the molybdenum reduction furnace.
The nitrogen oxide analyzer has the beneficial effects that:
1. through setting up the gas survey jar of keeping in, the gas that awaits measuring that will once sample and obtain is collected, then carries out the detection of NO and nitrogenous total amount respectively, ensures to carry out the gas content that awaits measuring that detects to NO and nitrogenous total amount unanimously, improves and detects the accuracy.
2. The gas after reaction in the reaction chamber is collected and treated, so that the discharge of ozone, excited nitrogen dioxide, nitric oxide and ozone is avoided, and the environment is protected.
Drawings
Fig. 1 is a schematic block diagram of a nitrogen oxide analyzer according to the present invention.
FIG. 2 is a schematic diagram of gas delivery during calibration of the present NOx analyzer.
Fig. 3 is a schematic diagram of gas delivery of the present nox analyzer in detecting NO.
FIG. 4 is a schematic diagram of gas delivery of the present NOx analyzer during total nitrogen content measurement.
FIG. 5 is a schematic diagram of gas delivery during exhaust in the reaction chamber.
Detailed Description
In order to facilitate the understanding of the technical solutions of the present invention for those skilled in the art, the technical solutions of the present invention will be further described with reference to the drawings attached to the specification.
As shown in fig. 1, the nitrogen oxide analyzer according to the present invention includes a reaction chamber 7, a photomultiplier 10 disposed in the reaction chamber 7, a signal processor in signal connection with the photomultiplier 10, and a gas input device to be measured and an ozone input device connected to the reaction chamber 7. The ozone input device generates ozone and inputs the ozone into the reaction chamber 7, and the ozone is used for oxidizing NO conveyed into the reaction chamber through the gas to be detected input device, so that NO in the gas is excited and converted into excited NO 2 Excited state of NO 2 And their unstable, excited state NO 2 NO in return to ground state 2 In the process, the light energy is released, the light signal is received by the photomultiplier 10 and is transmitted to the signal processor, and the signal processor analyzes the light signal to obtain NO 2 And (4) measuring the concentration of NO or the total nitrogen content in the gas to be measured by calculation.
In the technical scheme, the gas input device to be detected comprises a double-layer pipe 3, a five-way valve 4, a temporary storage tank 5 for gas to be detected and a molybdenum furnace 6 which are sequentially arranged. The temporary storage tank 5 for the gas to be measured comprises a sealed tank body and a pressure membrane 53 arranged in the sealed tank body. The pressure membrane 53 divides the sealed tank into a gas-to-be-measured region 51 and a pressure gas region 52. The gas area to be measured 51 is connected with a gas inlet to be measured 55 and a gas outlet to be measured 55. The pressurised gas zone 52 is connected to a pressurised gas inlet 56 and a pressurised gas outlet 57. The five-way valve 4 and the molybdenum furnace 6 are shown connected to a gas inlet 54 to be measured and a gas outlet 55 to be measured, respectively. The pressure air inlet 56 and the pressure air outlet 57 are respectively connected with a pressure air inlet pump and a pressure air exhaust valve.
Based on the above technical scheme, firstly, enough sampled gas to be detected is input into the gas area 51 of the temporary storage tank 5 for gas to be detected for temporary storage, and then gas sampling is suspended or gas is input into the gas area 51 of the temporary storage tank 5 for gas to be detected. Instead, a certain amount of pressure-regulating gas is input into the pressure gas area 52 of the temporary storage tank 5 for gas to be measured by the pressure gas intake pump, and the pressure membrane 53 is squeezed by the pressure-regulating gas, so that the pressure membrane 53 squeezes the gas to be measured in the gas area 51 to be measured, and the gas to be measured in the gas area 51 to be measured is output into the reaction chamber 7 through the gas outlet 55 to be measured. The gas to be detected is excited and oxidized under the action of ozone after entering the reaction chamber 7, the detection of the amount of nitric oxide or the total amount of nitrogen in the gas to be detected is realized, and the information of the amount of nitric oxide or the total amount of nitrogen is stored through the signal processor.
After the operation process at the upper stage is completed, the gas in the reaction chamber 7 is evacuated, then a certain amount of pressure adjusting gas is continuously input into the pressure gas area 52 of the temporary storage tank 5 for gas to be measured through the pressure gas inlet pump, the pressure membrane 53 is continuously extruded through the pressure adjusting gas, so that the pressure membrane 53 continuously extrudes the gas to be measured in the gas area 51 to be measured, and the gas to be measured in the gas area 51 to be measured is continuously output into the reaction chamber 7 through the gas outlet 55 to be measured. The gas to be detected is excited and oxidized under the action of ozone after entering the reaction chamber 7, the detection of the total nitrogen content or the total nitrogen oxide content in the gas to be detected is realized, the information is stored by the signal processor and is calculated with the nitrogen oxide content or the total nitrogen content obtained by the previous detection, and NO in the gas to be detected are obtained 2 And the amount of the total amount of nitrogen.
Based on the technical scheme, the temporary storage tank 5 for the gas to be detected is arranged and the gas to be detected is discharged, so that enough gas to be detected with consistent component content is obtained through one-time sampling or a period of continuous sampling, and then NO and NO in the gas to be detected are detected 2 And the amount of the total amount containing nitrogen is detected, so that the detection precision is improved, and the influence on the detection precision and accuracy caused by the too fast change of the concentration or the content of the gas to be detected in the detection of the amount of the total amount containing nitrogen and NO is avoided.
In this technical scheme, double-layer tube 3 includes inner tube 31 and outer tube 32, and inner tube 31 both ends are provided with inner tube air inlet 33 and inner tube gas vent 34 respectively, are connected with the outer tube air inlet 35 to the interior input balance gas of outer tube on the outer tube 32. The inner tube air outlet 34 is communicated with the five-way valve 4, the air to be measured is input into the five-way valve 5, and the inner tube air inlet 33 is communicated with the input pump 1 to be measured.
Through setting up double-layer tube 3, get into the aqueous vapor in the gas in the reacting chamber 7 and get rid of, avoid the light that produces in the gas detection that awaits measuring in the aqueous vapor absorption reacting chamber, influence detection effect. In the double-layer pipe 3, the air inlet 35 of the outer pipe supplies air to the outer pipe, so that the air pressure balance in the inner pipe and the outer pipe is ensured, and the water vapor in the gas to be detected is conveniently discharged.
In the technical scheme, a first oxidation filter 2 and a first air duct 20 which are connected in parallel are connected to an exhaust port 11 of an air input pump 1 to be detected. The air outlet 21 of the first oxidation filter 2 and the end part of the first air duct 20 far away from the gas to be detected input pump 1 are both communicated with an inner tube air inlet 33 on an inner tube 31 of the double-layer tube 3.
A strong oxidant is arranged in the first oxidation filter 2, and NO in the gas to be detected is oxidized into NO when the gas to be detected passes through the first oxidation filter 2 2 . As shown in FIG. 2, before detection, when the analyzer is verified, the gas to be detected firstly passes through the first oxidation filter 2, and NO in the gas to be detected is oxidized into NO 2 Containing NO only 2 Is not passed through the molybdenum furnace 6, but directly enters the reaction chamber 7 due to the NO in the ground state 2 The photoelectric multiplier tube 10 can not obtain optical signals, and a signal processor connected with the photoelectric multiplier tube 10 can not obtain zero information, so that the analyzer can be verified.
In this technical solution, the five-way valve 4 includes a main air inlet 41 communicated with the inner tube air outlet 34 on the inner tube 31 of the double-layer tube 3, a first air outlet 43 communicated with the to-be-measured air inlet 54 of the sealed tank, a second air outlet 44 communicated with the ozone input device, a third air outlet 42 communicated with the outer tube air inlet 35 on the outer tube 32 of the double-layer tube 3, and a fourth air outlet 45 communicated with the external environment. The five-way valve 4 supplies air to the ozone generator, the temporary storage tank 5 for the gas to be measured and the outer tube of the double-layer tube. The fourth gas outlet 45 is in communication with the external environment, allowing for direct discharge of excess gas to the environment.
In the technical scheme, the molybdenum furnace 6 comprises a furnace body, a molybdenum heating wire arranged in the furnace body, and a molybdenum furnace air inlet 62 and a molybdenum furnace air outlet 63 which are arranged on the furnace body. The gas inlet 62 of the molybdenum furnace is connected with the gas outlet 55 to be measured of the sealed tank body, and the gas outlet 63 of the molybdenum furnace is communicated with the reaction chamber 7. An air guide coil 61 is further arranged in the furnace body, and two ends of the air guide coil 61 respectively extend out of the furnace body and are respectively communicated with a waste gas outlet 71 of the reaction chamber 7 and the external environment.
Based on the technical scheme, the device to be testedThe gas enters a molybdenum furnace 6, and the working principle of the molybdenum furnace is as follows: molybdenum as catalyst, at 315 deg.C and high temperature, NO 2 Conversion to NO and O 2 . When the total nitrogen content in the gas to be tested is tested, NO in the gas to be tested is measured by the molybdenum furnace 6 2 All converted into NO, measuring the total NO content, and calculating the NO content in the gas to be measured by measuring the independent NO content in the gas to be measured 2 NO and total nitrogen content.
Based on the above technical scheme, the gas guiding coil 61 is arranged in the molybdenum furnace, two ends of the gas guiding coil 61 respectively extend out of the furnace body and are respectively communicated with the waste gas outlet 71 of the reaction chamber 7 and the external environment, namely, after the reaction in the reaction chamber 7 is completed and the measurement is completed, the tail gas in the reaction chamber 7 is introduced into the gas guiding coil 61, and the gas (mainly O) in the gas guiding coil 61 is realized through the high temperature in the molybdenum furnace 6 3 ) Is heated to O 3 Decomposition to O 2 And directly discharged into the air.
In the technical scheme, the gas outlet 55 of the sealed tank to be measured is also connected with a second gas guide tube 60, the second gas guide tube 60 is connected with the molybdenum furnace 6 in parallel, and the other end of the second gas guide tube is communicated with the reaction chamber 7. When the NO content in the gas to be detected is detected, the gas to be detected is directly conveyed into the reaction chamber 7 through the second gas guide pipe 60 without passing through the molybdenum furnace 6, so that the NO content in the gas to be detected is prevented 2 Is reduced to NO, affecting the assay result.
In the technical scheme, the ozone input device comprises a second oxidation filter 8 and an ozone generator 9 which are arranged in sequence. The air inlet 81 of the second oxidation filter 8 is connected with the second air outlet 44 of the five-way valve 4, and the air outlet 91 of the ozone generator 9 is communicated with the reaction chamber 7. The second oxidation filter 8 is arranged to oxidize NO in the gas to NO 2 Then enters the ozone generator 9 together with the oxygen, the oxygen is ionized under high pressure in the ozone generator 9, the oxygen is oxidized into ozone, and finally the ozone is conveyed into the reaction chamber to react with NO. The second oxidation filter 8 is arranged to oxidize NO in the gas to NO 2 And the NO is prevented from entering the reaction chamber through the ozone generator 9 to influence the detection precision.
In the present technical solution, the waste gas outlet 72 of the reaction chamber 7 is connected with the gas inlet 81 of the second oxidation filter 8, and the gas outlet 82 of the second oxidation filter 8 is communicated with one end of the gas guiding coil 61 in the molybdenum reduction furnace 6. After the reaction finishes in the reaction chamber 7, and this item detects the completion back, through pump 70 with gaseous transport to second oxidation filter 8 in the reaction chamber 7, oxidize through the gas after the reaction in the reaction chamber 7, then pass through air guide coil 61 again, add thermal decomposition, be oxygen with ozonolysis, direct emission avoids causing the pollution to the air circumstance.
The detection process comprises the following steps:
the first step is as follows: the present nox analyzer was verified, with the gas delivery path as shown in fig. 2: the gas to be measured passes through the first oxidation filter 2, NO in the gas to be measured is oxidized into NO 2 Finally, the gas to be detected sequentially passes through the double-layer pipe 3, the five-way valve 4, the temporary storage tank 5 of the gas to be detected and the second gas guide pipe 60 and finally enters the reaction chamber 7, meanwhile, part of the gas to be detected is output by the five-way valve 4 and sequentially passes through the second oxidation filter 8 and the ozone generator 9, and oxygen in the gas is oxidized into ozone, ozone and NO 2 Entering the reaction chamber, the reaction can not be carried out in the reaction chamber, the photomultiplier can not obtain optical signals, and the signal processor needs to obtain zero signals. The step is used as a nitrogen oxide analyzer for verification.
The second step: the NO in the gas to be measured is detected, and the gas delivery path is shown in fig. 3. Firstly, the diameter of the gas to be measured which is enough to be sampled is input into the double-layer pipe 3, the five-way valve 4 and the temporary storage tank 5 of the gas to be measured in sequence through the first gas guide pipe 20. Sufficient gas to be measured is input into the gas area 51 of the gas temporary storage tank 5 to be measured for temporary storage, and then gas sampling is suspended or gas is input into the gas area 51 of the gas temporary storage tank 5 to be measured. Instead, a certain amount of pressure-regulating gas is input into the pressure gas area 52 of the temporary storage tank 5 for gas to be measured by the pressure gas inlet pump, and the pressure membrane 53 is extruded by the pressure-regulating gas, so that the pressure membrane 53 extrudes the gas to be measured in the gas area 51 to be measured, the gas to be measured in the gas area 51 to be measured is output from the gas outlet 55 to be measured, and is directly conveyed into the reaction chamber 7 through the second gas guide pipe 60. Meanwhile, part of gas to be detected is output by the five-way valve 4 and sequentially passes through the second oxidation filter 8 and the ozone generator 9, and NO in the gas is oxidized into NO by the second oxidation filter 8 2 The ozone generator 9 generates oxygen in the gasOxidation of gas to ozone, ozone and NO 2 Into the reaction chamber. NO in the gas to be detected is excited and oxidized under the action of ozone after entering the reaction chamber 7, so that the detection of the amount of the nitric oxide in the gas to be detected is realized, and the information of the amount of the nitric oxide is stored through a signal processor.
The third step: the total amount of nitrogen in the gas to be detected is detected, and the gas conveying path is shown in fig. 4. After the operation process of the second step is completed, the gas in the reaction chamber 7 is emptied, then a certain amount of pressure regulating gas is continuously input into the pressure gas area 52 of the temporary storage tank 5 for gas to be measured through the pressure gas inlet pump, the pressure membrane 53 is continuously extruded through the pressure regulating gas, so that the pressure membrane 53 continuously extrudes the gas to be measured in the gas area 51 to be measured, the gas to be measured in the gas area 51 to be measured is continuously output through the gas outlet 55 to be measured, then the gas to be measured enters the molybdenum furnace 6, the molybdenum furnace 6 continuously outputs NO in the gas to be measured 2 Reduced to NO and all NO is transported into the reaction chamber 7. Meanwhile, the gas to be detected is input into the pump 1 to continue working, part of the gas is conveyed into the second oxidation filter 8 and the ozone generator 9 through the five-way valve 4, and redundant gas is discharged into the air through a fourth air outlet 45 of the five-way valve 4. The gas is output by the five-way valve 4 and passes through a second oxidation filter 8 and an ozone generator 9 in sequence, and NO in the gas is oxidized into NO by the second oxidation filter 8 2 The ozone generator 9 oxidizes oxygen in the gas to ozone, ozone and NO 2 And enters the reaction chamber. After the gas to be detected (all NO) enters the reaction chamber 7, the gas to be detected is excited and oxidized under the action of ozone, so that the total nitrogen content in the gas to be detected is detected, the information is stored through a signal processor, and the information and the nitrogen monoxide content obtained through detection in the second step are calculated to obtain the total nitrogen content in the gas to be detected. Finally, calculating NO and NO in the gas to be measured 2 And the amount of the total amount of nitrogen.
And a fourth step of exhausting the gas inside the reaction chamber after the reaction inside the reaction chamber 7 is completed each time, and performing an oxidation treatment until the gas is directly discharged, as shown in fig. 5. The gas in the reaction chamber 7 is evacuated under the action of the pump 70 and is conveyed to the second oxidation filter 8, the second oxidation filter 8 oxidizes the gas, then the gas is conveyed to the gas guiding coil 61 in the molybdenum furnace 6, the gas guiding coil 61 is heated to decompose the gas in the gas guiding coil, and the ozone is decomposed into oxygen to be directly discharged.
Technical solution of the invention is described above with reference to the accompanying drawings, it is obvious that the specific implementation of the invention is not limited by the above-mentioned manner, and it is within the scope of the invention to adopt various insubstantial modifications of the inventive method concept and technical solution, or to apply the inventive concept and technical solution to other occasions without modification.

Claims (8)

1. A nitrogen oxide analyzer comprises a reaction chamber, a photomultiplier arranged in the reaction chamber, a signal processor in signal connection with the photomultiplier, and a gas input device to be detected and an ozone input device which are connected with the reaction chamber, and is characterized in that the gas input device to be detected comprises a double-layer tube, a five-way valve, a gas temporary storage tank to be detected and a molybdenum furnace which are sequentially arranged, the gas temporary storage tank to be detected comprises a sealing tank body and a pressure film arranged in the sealing tank body, the pressure film divides the sealing tank body into a gas area to be detected and a pressure gas area, the gas area to be detected is connected with a gas inlet to be detected and a gas outlet to be detected, the pressure gas area is connected with a pressure gas inlet and a pressure gas outlet, the five-way valve and the molybdenum furnace are respectively connected with the gas inlet to be detected and the gas outlet to be detected, and the pressure gas inlet and the pressure gas outlet are respectively connected with a pressure gas inlet pump and a pressure gas exhaust valve.
2. The nitrogen oxide analyzer according to claim 1, wherein the double-layer tube comprises an inner tube and an outer tube, an inner tube air inlet and an inner tube air outlet are respectively arranged at two ends of the inner tube, an outer tube air inlet for inputting balance gas into the outer tube is connected to the outer tube, the inner tube air outlet is communicated with the five-way valve, gas to be measured is input into the five-way valve, and a gas input pump to be measured is communicated with the inner tube air inlet.
3. The nitrogen oxide analyzer according to claim 2, wherein the exhaust port of the gas to be measured input pump is connected with a first oxidation filter and a first gas-guide tube which are connected in parallel, and the gas outlet of the first oxidation filter and the end part of the first gas-guide tube far away from the gas to be measured input pump are both communicated with the gas inlet of the inner tube on the inner tube of the double-layer tube.
4. The apparatus according to claim 1, wherein the five-way valve comprises a main inlet connected to the outlet of the inner tube of the double tube, a first outlet connected to the inlet of the gas to be measured of the sealed tank, a second outlet connected to the ozone input device, a third outlet connected to the inlet of the outer tube of the double tube, and a fourth outlet connected to the external environment.
5. The nitrogen oxide analyzer according to claim 1, wherein the molybdenum furnace comprises a furnace body, a molybdenum heating wire arranged in the furnace body, and a molybdenum furnace gas inlet and a molybdenum furnace gas outlet which are arranged on the furnace body, the molybdenum furnace gas inlet is connected with the gas outlet to be measured of the sealed tank body, and the molybdenum furnace gas outlet is communicated with the reaction chamber; and the two ends of the air guide coil pipe respectively extend out of the furnace body and are respectively communicated with a waste gas outlet of the reaction chamber and the external environment.
6. The nitrogen oxide analyzer of claim 1, wherein a second gas-guide tube is further connected to the gas outlet to be measured of the sealed tank, the second gas-guide tube is connected in parallel with the molybdenum furnace, and the other end of the second gas-guide tube is communicated with the reaction chamber.
7. The nitrogen oxide analyzer of claim 1, wherein the ozone input device comprises a second oxidation filter and an ozone generator, which are arranged in sequence, wherein an air inlet of the second oxidation filter is connected with a second air outlet of the five-way valve, and an air outlet of the ozone generator is communicated with the reaction chamber.
8. The nitrogen oxide analyzer of claim 7, wherein the exhaust gas outlet of the reaction chamber is connected with the gas inlet of a second oxidation filter, and the gas outlet of the second oxidation filter is communicated with one end of a gas guide coil in the molybdenum reduction furnace.
CN202211110142.4A 2022-09-13 2022-09-13 Nitrogen oxide analyzer Pending CN115615926A (en)

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Application Number Priority Date Filing Date Title
CN202211110142.4A CN115615926A (en) 2022-09-13 2022-09-13 Nitrogen oxide analyzer

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117191706A (en) * 2023-09-15 2023-12-08 小仙炖霸州食品有限公司 Azometer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117191706A (en) * 2023-09-15 2023-12-08 小仙炖霸州食品有限公司 Azometer
CN117191706B (en) * 2023-09-15 2024-02-13 小仙炖霸州食品有限公司 Azometer

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