CN113551722A - A flowmeter that is used for motor vehicle ring to examine station that has a tail gas cleanup function - Google Patents
A flowmeter that is used for motor vehicle ring to examine station that has a tail gas cleanup function Download PDFInfo
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- CN113551722A CN113551722A CN202111011023.9A CN202111011023A CN113551722A CN 113551722 A CN113551722 A CN 113551722A CN 202111011023 A CN202111011023 A CN 202111011023A CN 113551722 A CN113551722 A CN 113551722A
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- 238000010438 heat treatment Methods 0.000 claims abstract description 97
- 238000000746 purification Methods 0.000 claims abstract description 93
- 238000007689 inspection Methods 0.000 claims abstract description 27
- 230000007613 environmental effect Effects 0.000 claims abstract description 25
- 238000005259 measurement Methods 0.000 claims abstract description 24
- 239000007789 gas Substances 0.000 claims description 193
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 158
- 230000003197 catalytic effect Effects 0.000 claims description 117
- 239000004202 carbamide Substances 0.000 claims description 93
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 89
- 239000003054 catalyst Substances 0.000 claims description 60
- 238000007254 oxidation reaction Methods 0.000 claims description 54
- 230000003647 oxidation Effects 0.000 claims description 52
- 238000002347 injection Methods 0.000 claims description 37
- 239000007924 injection Substances 0.000 claims description 37
- 239000000446 fuel Substances 0.000 claims description 23
- 229910002651 NO3 Inorganic materials 0.000 claims description 21
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 21
- 238000006243 chemical reaction Methods 0.000 claims description 21
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 15
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 15
- 229930195733 hydrocarbon Natural products 0.000 claims description 15
- 150000002430 hydrocarbons Chemical class 0.000 claims description 15
- 239000001301 oxygen Substances 0.000 claims description 15
- 229910052760 oxygen Inorganic materials 0.000 claims description 15
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 14
- 239000000243 solution Substances 0.000 claims description 13
- 239000004215 Carbon black (E152) Substances 0.000 claims description 11
- 238000004891 communication Methods 0.000 claims description 11
- 238000005507 spraying Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 6
- 238000009283 thermal hydrolysis Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 230000002950 deficient Effects 0.000 claims description 4
- 229910021529 ammonia Inorganic materials 0.000 claims description 2
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 31
- 239000003502 gasoline Substances 0.000 description 14
- 238000001514 detection method Methods 0.000 description 11
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 10
- 238000000034 method Methods 0.000 description 7
- 238000006555 catalytic reaction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 238000007865 diluting Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 238000010790 dilution Methods 0.000 description 3
- 239000012895 dilution Substances 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001272 nitrous oxide Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9445—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
- B01D53/9454—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] characterised by a specific device
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/12—Cleaning arrangements; Filters
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention relates to a flowmeter with a tail gas purification function for a motor vehicle environmental inspection station, which comprises an air inlet system, a flow measurement system, a heating device, a tail gas purification device and a control unit, wherein the air inlet system sucks diluted automobile tail gas into the flow measurement system under the control of the control unit; heating device will dilute automobile exhaust heating to tail gas cleanup unit under the control of the control unit and purify required temperature, and tail gas cleanup unit purifies the automobile exhaust after heating, has realized having purified automobile exhaust when obtaining automobile exhaust flow.
Description
Technical Field
The invention relates to the field of tail gas purification treatment, in particular to a flowmeter with a tail gas purification function for an environmental inspection station of a motor vehicle.
Background
In order to prevent the pollution of motor vehicle exhaust to the environment, the vehicles of the emission inspection mechanism are required to be subjected to emission detection under different detection working conditions according to regulations. Need use the flowmeter when discharging the detection, and the flowmeter of ring inspection station is carrying out the exhaust flow and diluting the back that detects, and waste gas just directly discharges, has caused harm to the environment that measuring personnel and ring inspected the mechanism. Therefore, a flow meter device capable of purifying and discharging the exhaust gas is needed.
The invention patent CN111379614A discloses a device for collecting, purifying and treating automobile exhaust, which comprises an exhaust collecting module, an exhaust purifying module and an exhaust conveying module, wherein the exhaust purifying module carries out secondary purification treatment on nitrogen oxides, carbon monoxide and hydrocarbons by using a catalyst catalysis technology and by using reductive honeycomb ceramics and oxidative honeycomb ceramics, although the purification effect is relatively good, the implementation facilities and the flow are relatively complex, and the application and the popularization of the device are limited.
Disclosure of Invention
The invention aims to provide a flowmeter with an exhaust gas purification function for an automobile environmental inspection station, which can realize the purification of exhaust gas while obtaining the flow of the exhaust gas discharged by an automobile.
In order to achieve the purpose, the invention provides the following scheme:
a flow meter with exhaust gas purification for an automotive environmental protection station, the flow meter comprising: the system comprises an air inlet system, a flow measuring system, a heating device, a tail gas purification device and a control unit;
the air inlet system, the flow measuring system, the heating device and the tail gas purification device are sequentially connected along the flow direction of tail gas;
the air intake system is connected with the control unit and is used for sucking the diluted automobile exhaust to the flow measurement system under the control of the control unit;
the flow measuring system is connected with the control unit and is used for enabling the diluted automobile exhaust to generate vortex street vortices, transmitting ultrasonic waves to the diluted automobile exhaust generating the vortex street vortices, receiving the interfered ultrasonic waves, transmitting the interfered ultrasonic waves to the control unit and transmitting the diluted automobile exhaust to the heating device;
the control unit is used for obtaining the flow of the diluted automobile exhaust according to the interfered ultrasonic waves;
the control end of the heating device is connected with the control unit, and the heating device is used for heating the diluted automobile exhaust to the temperature required by the exhaust purification device under the control of the control unit and transmitting the heated automobile exhaust to the exhaust purification device;
the tail gas purification device is used for purifying the heated automobile tail gas.
Optionally, the exhaust gas purifying apparatus includes: an NSR catalytic device and a DOC oxidation catalyst;
the heating device, the NSR catalytic device and the DOC oxidation catalyst are sequentially connected along the flow direction of the tail gas;
the NSR catalytic device is used for purifying nitrogen oxides in the heated automobile exhaust;
the DOC oxidation catalyst is used for purifying carbon monoxide and hydrocarbon in the heated automobile exhaust.
Optionally, the exhaust gas purifying apparatus further includes: the system comprises a first nitrogen oxide gas sensor, a fuel supply system and a compressed air supply system;
the first nitrogen oxide gas sensor and an oil injection port of the fuel supply system are arranged at the joint between the heating device and the NSR catalytic device; an air supply port of the compressed air supply system is provided at a connection between the NSR catalytic device and the DOC oxidation catalyst;
the signal output end of the first nitrogen oxide gas sensor is connected with the control unit, and the first nitrogen oxide gas sensor is used for detecting the concentration of nitrogen oxide in the heated automobile exhaust and transmitting the concentration of nitrogen oxide in the heated automobile exhaust to the control unit;
the control unit is respectively connected with the control end of the fuel supply system and the control end of the compressed air supply system, and is used for obtaining the storage amount of nitrate according to the concentration of nitrogen oxides in the heated automobile exhaust and the flow of the diluted automobile exhaust, controlling the fuel supply system to inject oil when the storage amount of the nitrate is greater than or equal to a threshold value of the storage amount of the nitrate, enabling the stored nitrate to react with oil injected by the fuel supply system by utilizing the oxidability of nitrate under the oxygen-deficient condition and the action of a catalyst to remove the nitrate, and simultaneously controlling the compressed air supply system to inject air to provide oxygen for the DOC oxidation catalyst to purify carbon monoxide and hydrocarbon.
Optionally, the exhaust gas purifying apparatus includes: DOC oxidation catalyst, SCR catalytic conversion system and ASC catalytic converter;
the heating device, the DOC oxidation catalyst, the SCR catalytic conversion system and the ASC catalytic converter are sequentially connected;
the DOC oxidation catalyst is used for purifying carbon monoxide and hydrocarbon in the heated automobile exhaust;
the SCR catalytic conversion system is used for purifying nitrogen oxides in the heated automobile exhaust through ammonia gas generated by thermal hydrolysis of urea at high temperature;
the ASC catalytic converter is used for purifying ammonia gas which flows out of the SCR catalytic conversion system in a surplus mode.
Optionally, the SCR catalytic conversion system comprises: an SCR catalytic converter and a urea injection system;
the urea injection system comprises a urea solution tank, a urea injection pump and a urea nozzle;
the SCR catalytic converter is arranged between the DOC oxidation catalyst and the ASC catalytic converter; the urea nozzle is arranged on a connecting pipe between the DOC oxidation catalyst and the SCR catalytic converter, and the jet orifice of the urea nozzle is aligned with the inside of the SCR catalytic converter;
a liquid inlet of the urea injection pump is connected with the urea solution tank, a liquid outlet of the urea injection pump is connected with an inlet of the urea nozzle, a control end of the urea injection pump is connected with the control unit, and the urea injection pump is used for conveying urea in the urea solution tank to the urea nozzle under the control of the control unit;
the control end of the urea nozzle is connected with the control unit, and the urea nozzle is used for injecting urea into the SCR catalytic converter under the control of the control unit;
the SCR catalytic converter is used for purifying nitrogen oxides in the heated automobile exhaust through ammonia generated by thermal hydrolysis of the urea at high temperature.
Optionally, the flow meter further includes: a second oxynitride gas sensor;
the second oxynitride gas sensor is arranged at the connection between the flow measurement system and the heating device;
the signal output end of the second oxynitride gas sensor is connected with the control unit, and the second oxynitride gas sensor is used for detecting the concentration of the oxynitride in the diluted automobile exhaust and transmitting the concentration of the oxynitride to the control unit;
the control unit is used for obtaining urea spraying amount according to the concentration of the nitrogen oxides and the flow of the diluted automobile exhaust, and controlling the urea injection pump and the urea nozzle to inject urea into the SCR catalytic converter according to the urea spraying amount.
Optionally, the flow meter further includes: a first temperature sensor;
the first temperature sensor is arranged at the connection between the SCR catalytic converter and the DOC oxidation catalyst;
the signal output end of the first temperature sensor is connected with the control unit, and the first temperature sensor is used for detecting the temperature of the heated automobile exhaust before entering the SCR catalytic converter and transmitting the temperature of the heated automobile exhaust before entering the SCR catalytic converter to the control unit;
the control unit is used for obtaining SCR catalytic heating temperature difference according to the temperature of the heated automobile exhaust before entering the SCR catalytic converter and the temperature required by purification of the SCR catalytic converter, and controlling the heating device to heat the heated automobile exhaust before entering the SCR catalytic converter to the temperature required by purification of the SCR catalytic converter according to the SCR catalytic heating temperature difference.
Optionally, the flow meter further includes: a second temperature sensor and a third temperature sensor;
the second temperature sensor is arranged at the joint of the flow measuring system and the heating device, and the third temperature sensor is arranged at the joint of the heating device and the tail gas purification device;
the signal output end of the second temperature sensor is connected with the control unit, and the second temperature sensor is used for measuring the temperature of the diluted automobile exhaust and transmitting the temperature of the diluted automobile exhaust to the control unit;
the signal output end of the third temperature sensor is connected with the control unit, and the third temperature sensor is used for measuring the temperature of the heated automobile exhaust and transmitting the temperature of the heated automobile exhaust to the control unit;
the control unit is used for obtaining the heating temperature difference according to the temperature of the diluted automobile exhaust and the temperature difference before heating of the temperature required for purifying the exhaust purification device, and the temperature of the heated automobile exhaust and the temperature difference after heating of the temperature required for purifying the exhaust purification device, and controlling the heating temperature difference according to the heating temperature difference, the heating device heats the diluted automobile exhaust to the temperature required for purifying the exhaust purification device.
Optionally, the flow meter further includes: the first communicating pipe, the second communicating pipe and the exhaust pipe;
the first communication pipe is arranged between the flow measuring system and the heating device, and the second temperature sensor is arranged at one end, close to the heating device, of the first communication pipe;
the second communicating pipe is arranged between the heating device and the tail gas purification device, and the third temperature sensor is arranged at one end, close to the tail gas purification device, of the second communicating pipe;
the exhaust pipe is connected with the tail gas purification device and used for discharging automobile tail gas purified by the tail gas purification device.
Optionally, the flow measurement system includes: the ultrasonic flow meter comprises an ultrasonic transmitting sensor, an ultrasonic receiving sensor, a turbulence rod and a flow measuring tube;
one end of the flow measuring pipe is connected with the air inlet system, and the other end of the flow measuring pipe is connected with the heating device; the ultrasonic transmitting sensor is arranged at one end inside the flow measuring pipe, the ultrasonic receiving sensor is arranged at the other end inside the flow measuring pipe, and the ultrasonic transmitting sensor and the ultrasonic receiving sensor are arranged oppositely; the flow disturbing rod is arranged on the side wall of the flow measuring pipe;
the ultrasonic emission sensor is used for emitting ultrasonic waves to the diluted automobile exhaust in the flow measuring pipe;
the turbulent flow rod is used for enabling diluted automobile exhaust in the flow measuring pipe to generate vortex street vortices so as to interfere ultrasonic waves emitted by the ultrasonic emission sensor;
the signal output end of the ultrasonic receiving sensor is connected with the control unit, and the ultrasonic receiving sensor is used for receiving ultrasonic waves interfered by the spoiler rod and transmitting the interfered ultrasonic waves to the control unit.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a flowmeter with a tail gas purification function for an automobile environmental inspection station, wherein an air inlet system sucks diluted automobile tail gas into a flow measuring system under the control of a control unit, the flow measuring system enables the diluted automobile tail gas to generate vortex street vortices, ultrasonic waves are emitted to the diluted automobile tail gas generating the vortex street vortices, the interfered ultrasonic waves are received and transmitted to the control unit, and the control unit obtains the flow of the diluted automobile tail gas according to the interfered ultrasonic waves; heating device will dilute automobile exhaust heating to tail gas cleanup unit under the control of the control unit and purify required temperature, and tail gas cleanup unit purifies the automobile exhaust after heating, has realized having purified automobile exhaust when obtaining automobile exhaust flow.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a flow meter with an exhaust gas purification function for an environmental inspection station of a motor vehicle according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a flow meter with an exhaust gas purification function for an environmental inspection station of a motor vehicle according to a second embodiment of the present invention;
description of the symbols: 1-an air inlet system, 2-a flow measuring system, 3-a first communicating pipe, 4-a heating device, 5-a second communicating pipe, 6-a tail gas purifying device, 7-an exhaust pipe, 8-an electric cabinet system, 9-a front baffle, 10-a middle baffle, 11-a rear baffle, 12-a lower baffle, 13-a lock wheel, 14-an air inlet, 15-a fan, 16-a supporting baffle, 17-a flow measuring pipe, 18-a second temperature sensor, 19-a third temperature sensor, 20-a discharge sensor, 21-a fourth temperature sensor, 22-a zirconium oxide sensor, 23-a fifth temperature sensor, 24-a pressure sensor, 25-an ultrasonic transmitting sensor, 26-a turbulence rod and 27-an ultrasonic receiving sensor, 28-DOC oxidation catalyst, 29-SCR catalytic conversion system, 30-ASC catalytic converter, 31-second nitrogen oxide gas sensor, 32-first temperature sensor, 33-SCR catalytic converter, 34-urea injection system, 35-urea solution tank, 36-urea injection pump, 37-urea nozzle, 38-NSR catalytic device, 39-first nitrogen oxide gas sensor, 40-third nitrogen oxide gas sensor, 41-sixth temperature sensor, 42-fuel supply system, 43-compressed air supply system, 44-third communicating pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a flowmeter with an exhaust gas purification function for an automobile environmental inspection station, which can realize the purification of exhaust gas while obtaining the flow of the exhaust gas discharged by an automobile.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The invention utilizes the technology of tail gas post-treatment purification catalysis to treat main pollutants such as carbon monoxide, hydrocarbon and nitric oxide generated during the environmental inspection of the gasoline vehicle at one time, and particularly provides two embodiments of flow meter structures with tail gas purification functions.
Example one
A flowmeter with exhaust gas purification function for an environmental inspection station of a motor vehicle, as shown in fig. 1, the flowmeter comprising: the system comprises an air inlet system 1, a flow measuring system 2, a heating device 4, an exhaust gas purification device 6 and a control unit.
The intake system 1, the flow rate measurement system 2, the heating device 4, and the exhaust gas purification device 6 are connected in this order along the flow direction of the exhaust gas.
The air intake system 1 is connected with the control unit, and the air intake system 1 is used for sucking diluted automobile exhaust to the flow measurement system 2 under the control of the control unit.
Flow measurement system 2 is connected with the control unit, and flow measurement system 2 is used for making the automobile exhaust after diluting produce the vortex street vortex, to the automobile exhaust after the dilution that has produced the vortex street vortex transmission ultrasonic wave, receives the ultrasonic wave after the interference, with the ultrasonic wave transmission to the control unit after the interference to automobile exhaust after will diluting transmits to heating device 4.
The control unit is used for obtaining the flow of the diluted automobile exhaust according to the interfered ultrasonic waves. The frequency of the ultrasonic waves received by the control unit is in direct proportion to the flow of the diluted automobile exhaust, and the flow of the diluted automobile exhaust can be known after the control unit obtains the frequency of the ultrasonic waves. The flow calculation function is already realized in the existing flow meter of the detection station.
The control end of the heating device 4 is connected with the control unit, and the heating device 4 is used for heating the diluted automobile exhaust to the temperature required by the purification of the exhaust purification device 6 under the control of the control unit and transmitting the heated automobile exhaust to the exhaust purification device 6.
The exhaust gas purification device 6 is used for purifying the heated automobile exhaust.
The exhaust gas purification device 6 includes: an NSR catalytic device 38 and a DOC oxidation catalyst 28.
The heating device 4, the NSR catalytic device 38, and the DOC oxidation catalyst 28 are connected in this order in the flow direction of the exhaust gas.
The NSR catalyst device 38 is used to purify nitrogen oxides in the heated vehicle exhaust.
The DOC oxidation catalyst 28 is used to purify the heated automobile exhaust from carbon monoxide and hydrocarbons.
The exhaust gas purification device 6 further includes: a first nox gas sensor 39, a fuel supply system 42 and a compressed air supply system 43.
The first nox gas sensor 39 and the fuel injection port of the fuel supply system 42 are both arranged at the connection between the heating device 4 and the NSR catalytic device 38; an air supply port of the compressed air supply system 43 is provided at the connection between the NSR catalytic device 38 and the DOC oxidation catalyst 28.
The signal output end of the first nitrogen oxide gas sensor 39 is connected with the control unit, and the first nitrogen oxide gas sensor 39 is used for detecting the concentration of nitrogen oxide in the heated automobile exhaust and transmitting the concentration of nitrogen oxide in the heated automobile exhaust to the control unit.
The control unit is respectively connected with the control end of the fuel supply system 42 and the control end of the compressed air supply system 43, and is used for obtaining the storage amount of nitrate according to the concentration of nitrogen oxides in heated automobile exhaust and the flow rate of diluted automobile exhaust, when the storage amount of the nitrate is greater than or equal to the threshold value of the storage amount of the nitrate, the fuel supply system 42 is controlled to inject oil, the stored nitrate is enabled to react with the oil injected by the fuel supply system 42 by utilizing the nitrate oxidability under the oxygen-deficient condition and the action of a catalyst to remove the nitrate, and meanwhile, the compressed air supply system 43 is controlled to inject air to provide oxygen for the DOC oxidation catalyst 28 to purify carbon monoxide and hydrocarbon.
Preferably, the fuel injection can be performed by injecting the fuel in the fuel tank into front of the NSR catalytic device 38 through a fuel injector, and the injection can be performed by controlling the opening and closing of a valve.
The principle of nitrate formation is: the diluted exhaust gas is rich in oxygen due to the presence of much air, and under oxygen rich conditions, the nitrogen oxides are oxidized on the catalyst precious metals in the NSR catalytic device 38 and then react with the nitrogen oxide inventory to form nitrates.
The nitrate removal principle is as follows: the oil injected from the fuel supply system 42 reacts with the oxidized nitrate under the oxygen-deficient condition and the action of the catalyst to produce non-pollution gas such as nitrogen gas.
Because oxygen can be reduced during oil injection, and the oxidation reaction condition of the DOC oxidation catalyst 28 at the back can not be met, a compressed air supply system 43 is also arranged in front of the DOC oxidation catalyst 28, and air is injected during oil injection to ensure that the DOC oxidation catalyst 28 works normally.
The flow meter further comprises: and a third nox gas sensor 40. The third nitrogen oxide gas sensor 40 is arranged at the connection position between the NSR catalytic device 38 and the DOC oxidation catalyst 28, the signal output end of the third nitrogen oxide gas sensor 40 is connected with the control unit, and the third nitrogen oxide gas sensor 40 is used for detecting the concentration of nitrogen oxide in the automobile exhaust purified by the NSR catalytic device and transmitting the concentration to the control unit so as to check the purification effect of the nitrogen oxide.
The flow meter further comprises: a second temperature sensor 18 and a third temperature sensor 19.
A second temperature sensor 18 is provided at the junction of the flow rate measuring system 2 and the heating device 4, and a third temperature sensor 19 is provided at the junction of the heating device 4 and the exhaust gas purification device 6.
The signal output end of the second temperature sensor 18 is connected with the control unit, and the second temperature sensor 18 is used for measuring the temperature of the diluted automobile exhaust and transmitting the temperature of the diluted automobile exhaust to the control unit.
The signal output end of the third temperature sensor 19 is connected with the control unit, and the third temperature sensor 19 is used for measuring the temperature of the heated automobile exhaust and transmitting the temperature of the heated automobile exhaust to the control unit.
The control unit is used for obtaining a heating temperature difference according to the temperature difference before heating of the diluted automobile exhaust and the temperature required for purifying the exhaust purification device 6 and the temperature difference after heating of the temperature of the heated automobile exhaust and the temperature required for purifying the exhaust purification device 6, and controlling the heating device 4 to heat the diluted automobile exhaust to the temperature required for purifying the exhaust purification device 6 according to the heating temperature difference.
The flow meter further comprises: a sixth temperature sensor 41. The sixth temperature sensor 41 is arranged at the connection position between the NSR catalytic device 38 and the DOC oxidation catalytic device 28, the signal output end of the sixth temperature sensor 41 is connected with the control unit, the sixth temperature sensor 41 is used for transmitting the temperature signal of the diluted exhaust gas before the DOC oxidation catalytic device 28 is transmitted to the control unit, the control unit judges whether the heated diluted exhaust gas reaches the temperature required by the reaction of the DOC oxidation catalytic device 28, and then the heating device 4 is controlled to heat the diluted automobile exhaust gas to the temperature required by the reaction of the DOC oxidation catalytic device 28.
Specifically, the third temperature sensor 19 is configured to transmit a temperature signal of the diluted exhaust gas before the control unit NSR catalytic device 38, and determine whether the heated diluted exhaust gas reaches a temperature required for the NSR catalytic reaction.
The flow meter further comprises: a first communication pipe 3, a second communication pipe 5, and an exhaust pipe 7.
The first communication pipe 3 is provided between the flow rate measuring system 2 and the heating device 4, and the second temperature sensor 18 is provided at one end of the first communication pipe 3 near the heating device 4.
The second communicating pipe 5 is arranged between the heating device 4 and the exhaust gas purification device 6, the third temperature sensor 19 is arranged at one end of the second communicating pipe 5 close to the exhaust gas purification device 6, and the first nitrogen oxide gas sensor 39 and the fuel injection port of the fuel supply system 42 are both arranged on the second communicating pipe 5.
The first communicating pipe 3 and the second communicating pipe 5 play a role in transitional connection, and the communicating pipes are selected from cylindrical pipelines with high-temperature resistance and corrosion resistance and the diameter slightly larger than that of the pipelines of the connecting devices.
The heating device 4 is an electric heater which is provided with an air inlet and an air outlet and is respectively connected with the first communicating pipe 3 and the second communicating pipe 5, an electric heating element is arranged inside the electric heater for heating, and the heating device 4 can be replaced by other heating type heating devices 4.
The exhaust pipe 7 is connected with the exhaust gas purification device 6, and the exhaust pipe 7 is used for discharging automobile exhaust purified by the exhaust gas purification device 6.
The exhaust pipe 7 is provided with a fourth temperature sensor 21, the signal output end of the fourth temperature sensor 21 is connected with the control unit, and the fourth temperature sensor 21 is used for detecting the temperature of the gas purified by the tail gas purification device 6 and transmitting the temperature of the gas to the control unit. Increasing the exhaust gas temperature at this point in the optimization of the matching makes it possible to make the reaction temperature of the exhaust gas purification device 6 more accurate.
The flow meter further comprises: and a third communication pipe 44. The third communicating pipe 44 is provided between the NSR catalyst device 38 and the DOC oxidation catalyst 28, and the third nitrogen oxide gas sensor 40, the sixth temperature sensor 41, and the air supply port of the compressed air supply system 43 are all provided on the third communicating pipe 44.
The intake system 1 includes: an air inlet 14, a fan 15 and a motor.
The air inlet 14 is connected to the flow measurement system 2. The air inlet 14 is also connected with the output end of a Y-shaped conveying pipe for collecting the mixture of the tail gas and the air discharged by the gasoline vehicle.
The control end and the control unit of motor are connected, and the output shaft and the fan 15 of motor are connected, and the motor is used for driving fan 15 under the control of control unit and inhales the automobile exhaust after will diluting to flow measurement system 2. The fan 15 may be replaced by other driving forms of the fan 15.
The flow rate measurement system 2 includes: ultrasonic wave transmitting transducer 25, ultrasonic wave receiving transducer 27, spoiler bar 26 and flow rate measuring tube 17.
One end of the flow rate measuring tube 17 is connected to the intake system 1, and the other end of the flow rate measuring tube 17 is connected to the heating device 4. An ultrasonic wave transmitting sensor 25 is provided at one end of the inside of the flow measurement pipe 17, an ultrasonic wave receiving sensor 27 is provided at the other end of the inside of the flow measurement pipe 17, and the ultrasonic wave transmitting sensor 25 is disposed opposite to the ultrasonic wave receiving sensor 27. Turbulence bars 26 are provided on the side walls of the flow measurement tube 17. The flow measurement pipe 17 is a pipe for measuring flow.
The ultrasonic wave emitting sensor 25 is used for emitting ultrasonic waves to the diluted automobile exhaust gas in the flow measuring pipe 17. The emitted ultrasonic waves are constant-amplitude high-frequency ultrasonic waves.
The spoiler bars 26 are used to generate vortex street vortices in the diluted vehicle exhaust in the flow measurement tube 17, which disturb the ultrasonic waves emitted by the ultrasonic emission sensor 25.
The signal output end of the ultrasonic receiving sensor 27 is connected with the control unit, and the ultrasonic receiving sensor 27 is used for receiving the ultrasonic waves interfered by the spoiler rod 26 and transmitting the interfered ultrasonic waves to the control unit.
The flow measurement pipe 17 is also provided with a zirconia sensor 22 inside, and the zirconia sensor 22 is used for detecting the oxygen content in the diluted automobile exhaust in the flow measurement pipe 17. The dilution ratio is obtained by comparing the oxygen content measured by the zirconia sensor 22 with the oxygen content in the original exhaust gas (measured by a five-gas analyzer in the detection station), the volume per second of exhaust is calculated from the dilution ratio and the flow rate of the diluted automobile exhaust gas (obtained by the ultrasonic wave transmitting sensor 25 and the ultrasonic wave receiving sensor 27), and then the amount of pollutants discharged by the automobile per second is calculated from the exhaust volume and the exhaust concentration measured by the five-gas analyzer. This calculation is prior art and the original flow meter of the test station has achieved this function.
A fifth temperature sensor 23 and a pressure sensor 24 are further arranged on the side wall of the flow measuring pipe 17, the fifth temperature sensor 23 is used for detecting the temperature of the diluted automobile exhaust in the flow measuring pipe 17, the pressure sensor 24 is used for detecting the pressure of the diluted automobile exhaust in the flow measuring pipe 17, the signal output end of the fifth temperature sensor 23 and the signal output end of the pressure sensor 24 are both connected with the control unit and are displayed on the control unit, and whether the state of the flow meter is normal or not can be known according to the displayed temperature and pressure.
As shown in fig. 1, the flow meter further includes an electric cabinet system 8, and the electric cabinet system 8 is disposed below the air intake system 1 in the vertical direction, and is mainly used for power distribution and protection.
The flowmeter is also provided with a front baffle 9, a middle baffle 10, a rear baffle 11, a lower baffle 12 and a flow measuring pipe 17 cover, and the flow measuring pipe mainly plays a role in supporting and protecting. The front baffle 9 is arranged between the air intake system 1 and the flow measuring tube 17, and the front baffle 9 is provided with an opening so that the air intake system 1 is connected with the flow measuring tube 17. The rear baffle 11 is arranged at the output end of the tail gas purification device 6, and the exhaust pipe 7 freely falls at the moment. The middle baffle 10 is arranged between the front baffle 9 and the rear baffle 11, and a plurality of arbitrary positions on the middle baffle are freely provided with the supporting baffle 16, and the middle baffle mainly plays a role in supporting the flow measuring system 2, the first communicating pipe 3, the heating device 4, the second communicating pipe 5 and the tail gas purifying device 6 to be positioned on the same horizontal line. The bottom end surfaces of the electric cabinet system 8, the front baffle 9 and the rear baffle 11 are positioned on the same horizontal plane, and the lower baffle 12 is in contact with the bottom end of the electric cabinet system 8, the bottom end of the front baffle 9 and the bottom end of the rear baffle 11 and plays a role in supporting the components thereon. The four corners below the lower baffle 12 are provided with locking wheels 13, so that the device of the invention can be moved and fixed, and the locking wheels 13 can be arranged into other types of movable parts, so as to achieve the effect of driving the device to move. The flow measuring pipe 17 covers all the parts above the middle baffle plate 10 by using the front baffle plate 9 and the rear baffle plate 11 as supports, and the flow measuring pipe 17 cover is easy to disassemble.
The joints of the flowmeter are all air-tight connections with sealing elements, and the sealing elements are easy to disassemble, so that the independent device can be nursed and maintained in time.
The use process of the embodiment of the invention in the process of carrying out the environmental inspection on the gasoline vehicle is as follows:
when the gasoline car carries out ring detection, an input pipe of a Y-shaped conveying pipe of a ring detection station is sleeved on a discharge pipe of the gasoline car to be detected, an output pipe of the Y-shaped conveying pipe is connected with an air inlet 14 of the flowmeter, tail gas discharged by the gasoline car and air mixed gas enter a flow measuring pipe 17 from the air inlet 14 under the action of a fan 15, the zirconia sensor 22, the fifth temperature sensor 23 and the pressure sensor 24 in the flow measuring tube 17 respectively obtain the oxygen concentration, temperature and pressure signals of all tail gas (gas entering an automobile exhaust analyzer) discharged by the gasoline car and air mixed gas, the ultrasonic transmitting sensor 25 transmits constant-amplitude high-frequency ultrasonic waves, vortex is generated after the mixed gas passes through the turbulence bar 26, the constant-amplitude high-frequency ultrasonic waves emitted by the ultrasonic wave emitting sensor 25 are interfered, and the ultrasonic wave receiving sensor 27 receives the ultrasonic waves changed by interference and then obtains the flow rate of the mixed gas through calculation. The diluted exhaust gas measured by the flow measuring tube 17 system enters the first communication pipe 3, the control unit receives the temperature signal of the diluted exhaust gas measured by the second temperature sensor 18, and since the diluted exhaust gas has partial heat loss before flowing through the NSR catalytic device 38 and the DOC oxidation catalyst 28 from the heating device 4, the control unit receives the temperature signal of the third temperature sensor 19 adjacent to the NSR catalytic device 38 and the temperature signal of the sixth temperature sensor 41 adjacent to the DOC oxidation catalyst 28, so as to control the heating temperature difference of the heating device 4, and the temperature of the diluted exhaust gas entering the NSR catalytic device 38 and the DOC oxidation catalyst 28 reaches the temperature required by the catalytic reaction. The heated diluted exhaust gas enters the NSR catalyst device 38, the NSR catalyst device 38 purifies nitrogen oxides in the heated vehicle exhaust, and the DOC oxidation catalyst 28 purifies carbon monoxide and hydrocarbons in the heated vehicle exhaust. The purified diluted exhaust gas is discharged through the exhaust pipe 7, the fourth temperature sensor 21 is placed on the exhaust pipe 7, and the fourth temperature sensor 21 feeds back the temperature signal of the purified diluted exhaust gas to the control unit.
Example two
The exhaust gas purifying device 6 of the flow meter with the exhaust gas purifying function for the automobile environmental inspection station provided in the second embodiment of the present invention is different from the exhaust gas purifying device 6 of the flow meter with the exhaust gas purifying function for the automobile environmental inspection station provided in the first embodiment, and the second oxynitride gas sensor 31, the first temperature sensor 32 and the emission sensor 20 are added.
The exhaust gas purification device 6 includes: a DOC oxidation catalyst 28, an SCR catalytic conversion system 29, and an ASC catalytic converter 30.
The heating device 4, the DOC oxidation catalyst 28, the SCR catalytic conversion system 29, and the ASC catalytic converter 30 are connected in this order.
The DOC oxidation catalyst 28 is used to purify the heated automobile exhaust from carbon monoxide and hydrocarbons.
The SCR catalytic conversion system 29 is used to purify nitrogen oxides in heated automobile exhaust gas by ammonia gas generated by thermal hydrolysis of urea at high temperature.
The ASC catalytic converter 30 is used to purify ammonia gas that flows out of the SCR catalytic conversion system 29 in excess.
The SCR catalytic conversion system 29 includes: an SCR catalytic converter 33 and a urea injection system 34;
the urea injection system 34 includes a urea solution tank 35, a urea injection pump 36, and a urea nozzle 37.
The SCR catalytic converter 33 is disposed between the DOC oxidation catalyst 28 and the ASC catalytic converter 30. The urea nozzle 37 is provided on a connection pipe between the DOC oxidation catalyst 28 and the SCR catalytic converter 33, near one end of the SCR catalytic converter 33, and an injection port of the urea nozzle 37 is aligned with the inside of the SCR catalytic converter 33.
A liquid inlet of the urea injection pump 36 is connected with the urea solution tank 35, a liquid outlet of the urea injection pump 36 is connected with an inlet of the urea nozzle 37, a control end of the urea injection pump 36 is connected with the control unit, and the urea injection pump 36 is used for conveying urea in the urea solution tank 35 to the urea nozzle 37 under the control of the control unit.
The control end of the urea nozzle 37 is connected to the control unit, and the urea nozzle 37 is used for injecting urea into the SCR catalytic converter 33 under the control of the control unit.
The SCR catalytic converter 33 is used to purify nitrogen oxides in heated automobile exhaust gas by ammonia gas generated by thermal hydrolysis of urea at a high temperature.
The flow meter further comprises: the second nitride gas sensor 31.
A second nitrous oxide gas sensor 31 is provided at the junction between the flow rate measuring system 2 and the heating device 4.
The signal output end of the second nox gas sensor 31 is connected to the control unit, and the second nox gas sensor 31 is configured to detect the concentration of nitrogen oxides in the diluted vehicle exhaust gas and transmit the concentration of nitrogen oxides to the control unit.
The control unit is used for obtaining urea spraying amount according to the concentration of nitrogen oxides and the flow of the diluted automobile exhaust, and controlling a urea injection pump 36 and a urea injection nozzle 37 to inject urea into the SCR catalytic converter 33 according to the urea spraying amount. 1 ton of urea can treat 2.5 tons of nitrogen oxides, the total amount of the nitrogen oxides is determined according to the concentration of the nitrogen oxides and the flow of the diluted automobile exhaust, and the using amount of the urea is further determined according to the total amount of the nitrogen oxides (the conventional method).
The flow meter further comprises: a first temperature sensor 32.
A first temperature sensor 32 is arranged at the connection between the SCR catalytic converter 33 and the DOC oxidation catalyst 28.
A signal output of the first temperature sensor 32 is connected to the control unit, and the first temperature sensor 32 is configured to detect a temperature of the heated vehicle exhaust gas before entering the SCR catalytic converter 33, and transmit the temperature of the heated vehicle exhaust gas before entering the SCR catalytic converter 33 to the control unit.
The control unit is used for obtaining an SCR catalytic heating temperature difference according to the temperature of the heated automobile exhaust before entering the SCR catalytic converter 33 and the temperature required by purification of the SCR catalytic converter 33, and controlling the heating device 4 to heat the automobile exhaust heated before entering the SCR catalytic converter 33 to the temperature required by purification of the SCR catalytic converter 33 according to the SCR catalytic heating temperature difference.
A discharge sensor 20 is also provided on the discharge pipe. The signal output end of the emission sensor 20 is connected to the control unit, and the emission sensor 20 is configured to detect a concentration signal of nitrogen oxide gas in the gas purified by the exhaust gas purification apparatus 6, and transmit the concentration signal of nitrogen oxide gas to the control unit. The purification effect of the device can be checked according to the nitrogen oxide gas concentration signal.
The flow meter provided by the embodiment II is used in the process of performing the ring inspection on the gasoline vehicle as follows:
when the gasoline car carries out ring detection, an input pipe of a Y-shaped conveying pipe of a ring detection station is sleeved on a discharge pipe of the gasoline car to be detected, an output pipe of the Y-shaped conveying pipe is connected with an air inlet 14 of the flowmeter, tail gas discharged by the gasoline car and air mixed gas enter a flow measuring pipe 17 from the air inlet 14 under the action of a fan 15, the zirconia sensor 22, the fifth temperature sensor 23 and the pressure sensor 24 in the flow measuring tube 17 respectively obtain the oxygen concentration, temperature and pressure signals of all tail gas (gas entering an automobile exhaust analyzer) discharged by the gasoline car and air mixed gas, the ultrasonic transmitting sensor 25 transmits constant-amplitude high-frequency ultrasonic waves, vortex is generated after the mixed gas passes through the turbulence bar 26, the constant-amplitude high-frequency ultrasonic waves emitted by the ultrasonic wave emitting sensor 25 are interfered, and the ultrasonic wave receiving sensor 27 receives the ultrasonic waves changed by interference and then obtains the flow rate of the mixed gas through calculation. The diluted exhaust gas measured by the flow measuring tube 17 enters the first communication tube 3, the control unit receives a diluted gas temperature signal measured by the second temperature sensor 18, and because the diluted exhaust gas has partial heat loss before flowing through the DOC oxidation catalyst 28 and the SCR catalytic converter 33 from the heating device 4, the control unit needs to receive gas temperature signals from the third temperature sensor 19 and the first temperature sensor 32 which are close to the DOC oxidation catalyst 28 so as to control the heating amount of the heating device 4, so that the temperature of the diluted exhaust gas entering the DOC oxidation catalyst 28 and the SCR catalytic converter 33 reaches the temperature required by catalytic reaction of the catalyst; meanwhile, the control unit receives a nitrogen oxide gas concentration signal from the second nitrogen oxide gas sensor 31 and a diluted exhaust gas flow signal measured by the flow measurement system 2 so as to obtain a gas concentration value of nitrogen oxide and a urea spraying amount required by the SCR catalytic converter 33 when the gasoline vehicle detects various working conditions, when the diluted exhaust gas enters the DOC oxidation catalyst 28, an oxidation reaction occurs to convert carbon monoxide and hydrocarbon in exhaust gas into harmless water and carbon dioxide, in the process that the purified gas in the DOC oxidation catalyst 28 enters the SCR catalytic converter 33, the control unit controls the urea injection pump 36 to inject the urea in the urea solution tank 35 into the SCR catalytic converter 33 through the urea nozzle 37, the urea generates ammonia gas after hydrolysis and pyrolysis reaction at high temperature, and the catalyst in the SCR catalytic converter 33 reduces the nitrogen oxide by using the ammonia gas, nitrogen is discharged, after the purification of nitrogen oxides is completed in the SCR catalytic converter 33, the discharged tail gas enters the ASC catalytic converter 30, and the ASC catalytic converter 30 is used for absorbing redundant flowing-out ammonia gas formed by the hydrolysis and pyrolysis of urea under the high-temperature condition, so that the purification of three harmful gases of carbon monoxide, hydrocarbon and nitrogen oxides is completed at one time; the purified diluted exhaust gas is discharged through the exhaust pipe 7, a fourth temperature sensor 21 and an exhaust sensor 20 are placed in the exhaust pipe 7, and the fourth temperature sensor 21 and the exhaust sensor 20 respectively feed back the temperature signal of the purified diluted exhaust gas and the concentration signal of the purified nitrogen oxide gas to the control unit to check the purification effect of the diluted exhaust gas.
The invention has the beneficial effects that:
the exhaust gas purification technology of the flowmeter with the exhaust gas purification function for the motor vehicle environmental inspection station selects the exhaust gas post-treatment purification catalysis technology, can treat main pollutants such as carbon monoxide, hydrocarbon and nitric oxide generated during environmental inspection of a gasoline vehicle at one time, is simpler and easier to operate and saves cost compared with the purification technology for treating each exhaust gas step by step in the prior art, is more efficient compared with the purification technology for purifying the exhaust gas by using related absorption liquid and a filter screen in the prior art, and can save space and cost by improving the method of the flowmeter compared with the prior art for designing an exhaust gas collection and purification treatment device. The control unit controls the heating amount of the heating device by receiving temperature signals of the related temperature sensors so as to meet the optimal temperature required by the reaction of each catalytic device in the tail gas purification device, drives the fan to start by controlling the motor, and controls the urea spraying amount of the urea spraying system by receiving flow signals of the flow measurement system and signals of the second oxynitride gas sensor. The normal operation of detection line is neither influenced at the petrol car ring inspection in-process and has guaranteed again that detection station staff and all ring edge borders do not receive tail gas pollution, and the device overall design is novel, convenient operation, realizes easily.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A flowmeter with an exhaust gas purification function for an automotive environmental inspection station, the flowmeter comprising: the system comprises an air inlet system, a flow measuring system, a heating device, a tail gas purification device and a control unit;
the air inlet system, the flow measuring system, the heating device and the tail gas purification device are sequentially connected along the flow direction of tail gas;
the air intake system is connected with the control unit and is used for sucking the diluted automobile exhaust to the flow measurement system under the control of the control unit;
the flow measuring system is connected with the control unit and is used for enabling the diluted automobile exhaust to generate vortex street vortices, transmitting ultrasonic waves to the diluted automobile exhaust generating the vortex street vortices, receiving the interfered ultrasonic waves, transmitting the interfered ultrasonic waves to the control unit and transmitting the diluted automobile exhaust to the heating device;
the control unit is used for obtaining the flow of the diluted automobile exhaust according to the interfered ultrasonic waves;
the control end of the heating device is connected with the control unit, and the heating device is used for heating the diluted automobile exhaust to the temperature required by the exhaust purification device under the control of the control unit and transmitting the heated automobile exhaust to the exhaust purification device;
the tail gas purification device is used for purifying the heated automobile tail gas.
2. The flowmeter with an exhaust gas purification function for an environmental inspection station of a motor vehicle according to claim 1, wherein the exhaust gas purification device comprises: an NSR catalytic device and a DOC oxidation catalyst;
the heating device, the NSR catalytic device and the DOC oxidation catalyst are sequentially connected along the flow direction of the tail gas;
the NSR catalytic device is used for purifying nitrogen oxides in the heated automobile exhaust;
the DOC oxidation catalyst is used for purifying carbon monoxide and hydrocarbon in the heated automobile exhaust.
3. The flowmeter with an exhaust gas purifying function for an environmental inspection station of a motor vehicle according to claim 2, wherein the exhaust gas purifying apparatus further comprises: the system comprises a first nitrogen oxide gas sensor, a fuel supply system and a compressed air supply system;
the first nitrogen oxide gas sensor and an oil injection port of the fuel supply system are arranged at the joint between the heating device and the NSR catalytic device; an air supply port of the compressed air supply system is provided at a connection between the NSR catalytic device and the DOC oxidation catalyst;
the signal output end of the first nitrogen oxide gas sensor is connected with the control unit, and the first nitrogen oxide gas sensor is used for detecting the concentration of nitrogen oxide in the heated automobile exhaust and transmitting the concentration of nitrogen oxide in the heated automobile exhaust to the control unit;
the control unit is respectively connected with the control end of the fuel supply system and the control end of the compressed air supply system, and is used for obtaining the storage amount of nitrate according to the concentration of nitrogen oxides in the heated automobile exhaust and the flow of the diluted automobile exhaust, controlling the fuel supply system to inject oil when the storage amount of the nitrate is greater than or equal to a threshold value of the storage amount of the nitrate, enabling the stored nitrate to react with oil injected by the fuel supply system by utilizing the oxidability of nitrate under the oxygen-deficient condition and the action of a catalyst to remove the nitrate, and simultaneously controlling the compressed air supply system to inject air to provide oxygen for the DOC oxidation catalyst to purify carbon monoxide and hydrocarbon.
4. The flowmeter with an exhaust gas purification function for an environmental inspection station of a motor vehicle according to claim 1, wherein the exhaust gas purification device comprises: DOC oxidation catalyst, SCR catalytic conversion system and ASC catalytic converter;
the heating device, the DOC oxidation catalyst, the SCR catalytic conversion system and the ASC catalytic converter are sequentially connected;
the DOC oxidation catalyst is used for purifying carbon monoxide and hydrocarbon in the heated automobile exhaust;
the SCR catalytic conversion system is used for purifying nitrogen oxides in the heated automobile exhaust through ammonia gas generated by thermal hydrolysis of urea at high temperature;
the ASC catalytic converter is used for purifying ammonia gas which flows out of the SCR catalytic conversion system in a surplus mode.
5. The flowmeter with an exhaust gas purification function for an automotive environmental inspection station according to claim 4, wherein the SCR catalytic conversion system comprises: an SCR catalytic converter and a urea injection system;
the urea injection system comprises a urea solution tank, a urea injection pump and a urea nozzle;
the SCR catalytic converter is arranged between the DOC oxidation catalyst and the ASC catalytic converter; the urea nozzle is arranged on a connecting pipe between the DOC oxidation catalyst and the SCR catalytic converter, and the jet orifice of the urea nozzle is aligned with the inside of the SCR catalytic converter;
a liquid inlet of the urea injection pump is connected with the urea solution tank, a liquid outlet of the urea injection pump is connected with an inlet of the urea nozzle, a control end of the urea injection pump is connected with the control unit, and the urea injection pump is used for conveying urea in the urea solution tank to the urea nozzle under the control of the control unit;
the control end of the urea nozzle is connected with the control unit, and the urea nozzle is used for injecting urea into the SCR catalytic converter under the control of the control unit;
the SCR catalytic converter is used for purifying nitrogen oxides in the heated automobile exhaust through ammonia generated by thermal hydrolysis of the urea at high temperature.
6. The flowmeter with exhaust gas purification function for an automotive environmental inspection station according to claim 5, further comprising: a second oxynitride gas sensor;
the second oxynitride gas sensor is arranged at the connection between the flow measurement system and the heating device;
the signal output end of the second oxynitride gas sensor is connected with the control unit, and the second oxynitride gas sensor is used for detecting the concentration of the oxynitride in the diluted automobile exhaust and transmitting the concentration of the oxynitride to the control unit;
the control unit is used for obtaining urea spraying amount according to the concentration of the nitrogen oxides and the flow of the diluted automobile exhaust, and controlling the urea injection pump and the urea nozzle to inject urea into the SCR catalytic converter according to the urea spraying amount.
7. The flowmeter with exhaust gas purification function for an automotive environmental inspection station according to claim 6, further comprising: a first temperature sensor;
the first temperature sensor is arranged at the connection between the SCR catalytic converter and the DOC oxidation catalyst;
the signal output end of the first temperature sensor is connected with the control unit, and the first temperature sensor is used for detecting the temperature of the heated automobile exhaust before entering the SCR catalytic converter and transmitting the temperature of the heated automobile exhaust before entering the SCR catalytic converter to the control unit;
the control unit is used for obtaining SCR catalytic heating temperature difference according to the temperature of the heated automobile exhaust before entering the SCR catalytic converter and the temperature required by purification of the SCR catalytic converter, and controlling the heating device to heat the heated automobile exhaust before entering the SCR catalytic converter to the temperature required by purification of the SCR catalytic converter according to the SCR catalytic heating temperature difference.
8. The flowmeter with exhaust gas purification function for an automotive environmental inspection station according to claim 1, further comprising: a second temperature sensor and a third temperature sensor;
the second temperature sensor is arranged at the joint of the flow measuring system and the heating device, and the third temperature sensor is arranged at the joint of the heating device and the tail gas purification device;
the signal output end of the second temperature sensor is connected with the control unit, and the second temperature sensor is used for measuring the temperature of the diluted automobile exhaust and transmitting the temperature of the diluted automobile exhaust to the control unit;
the signal output end of the third temperature sensor is connected with the control unit, and the third temperature sensor is used for measuring the temperature of the heated automobile exhaust and transmitting the temperature of the heated automobile exhaust to the control unit;
the control unit is used for obtaining the heating temperature difference according to the temperature of the diluted automobile exhaust and the temperature difference before heating of the temperature required for purifying the exhaust purification device, and the temperature of the heated automobile exhaust and the temperature difference after heating of the temperature required for purifying the exhaust purification device, and controlling the heating temperature difference according to the heating temperature difference, the heating device heats the diluted automobile exhaust to the temperature required for purifying the exhaust purification device.
9. The flowmeter with exhaust gas purification function for an automotive environmental checkpoint as set forth in claim 8, further comprising: the first communicating pipe, the second communicating pipe and the exhaust pipe;
the first communication pipe is arranged between the flow measuring system and the heating device, and the second temperature sensor is arranged at one end, close to the heating device, of the first communication pipe;
the second communicating pipe is arranged between the heating device and the tail gas purification device, and the third temperature sensor is arranged at one end, close to the tail gas purification device, of the second communicating pipe;
the exhaust pipe is connected with the tail gas purification device and used for discharging automobile tail gas purified by the tail gas purification device.
10. The flowmeter with exhaust gas purification function for an automotive environmental inspection station according to claim 1, wherein said flow rate measurement system comprises: the ultrasonic flow meter comprises an ultrasonic transmitting sensor, an ultrasonic receiving sensor, a turbulence rod and a flow measuring tube;
one end of the flow measuring pipe is connected with the air inlet system, and the other end of the flow measuring pipe is connected with the heating device; the ultrasonic transmitting sensor is arranged at one end inside the flow measuring pipe, the ultrasonic receiving sensor is arranged at the other end inside the flow measuring pipe, and the ultrasonic transmitting sensor and the ultrasonic receiving sensor are arranged oppositely; the flow disturbing rod is arranged on the side wall of the flow measuring pipe;
the ultrasonic emission sensor is used for emitting ultrasonic waves to the diluted automobile exhaust in the flow measuring pipe;
the turbulent flow rod is used for enabling diluted automobile exhaust in the flow measuring pipe to generate vortex street vortices so as to interfere ultrasonic waves emitted by the ultrasonic emission sensor;
the signal output end of the ultrasonic receiving sensor is connected with the control unit, and the ultrasonic receiving sensor is used for receiving ultrasonic waves interfered by the spoiler rod and transmitting the interfered ultrasonic waves to the control unit.
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| CN202111011023.9A CN113551722A (en) | 2021-08-31 | 2021-08-31 | A flowmeter that is used for motor vehicle ring to examine station that has a tail gas cleanup function |
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