CN115638839B - Vehicle ammonia emission testing system and testing method thereof - Google Patents
Vehicle ammonia emission testing system and testing method thereof Download PDFInfo
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Abstract
The invention provides a vehicle ammonia emission test system and a test method thereof, and belongs to the technical field of vehicle tail gas monitoring. The vehicle ammonia emission measurement system comprises a flow measurement device and an ammonia emission sampling device, wherein the flow measurement device is additionally arranged on a vehicle tail gas pipe and is used for measuring the real-time flow of the vehicle tail gas; the ammonia emission sampling device is connected with the flow testing device and is used for measuring the real-time concentration of ammonia pollutants in the vehicle tail gas, and the flow testing device and the ammonia emission sampling device are synchronously measured to obtain the real-time emission of the ammonia pollutants in the vehicle tail gas. The vehicle ammonia emission amount testing system provided by the invention can improve the real-time flow measurement precision of the vehicle tail gas emission flow, and meanwhile, avoid the situation that the real-time flow of the tail gas emission and the real-time concentration of ammonia pollutants in the tail gas have time sequence errors, thereby realizing the accuracy of the ammonia pollutant emission amount.
Description
Technical Field
The invention relates to the technical field of vehicle tail gas monitoring, in particular to a vehicle ammonia emission test system and a test method thereof.
Background
At present, the common measurement method of the ammonia emission is that the ammonia emission is firstly connected to the tail gas pipe through a gas collecting pipe, ammonia gas is collected by a direct collection method, and transient concentration data is obtained through an analysis module; and obtaining the flow after dilution by using a CVS (Constant Volume System) constant volume sampling system, and obtaining the exhaust flow before dilution by calculating a dilution coefficient DF (Dilution Factor). The scheme has the problem that the transient concentration of ammonia emission in the tail gas and the acquisition of transient flow data of the tail gas have time sequence deviation.
Meanwhile, the transient flow is obtained by dividing the diluted flow by a dilution coefficient, and the calculated transient flow has larger deviation from the actual transient flow, so that the finally obtained exhaust flow is inaccurate; the transient concentration is obtained by a direct extraction method, and because the transient concentration of ammonia emission has larger change, the problem of time sequence error between the transient flow of the tail gas and the transient concentration of the ammonia emission can cause larger uncertainty of the measurement result, namely the problem of poor accuracy of the measurement result.
Disclosure of Invention
In view of the above, the present invention is to provide a vehicle ammonia emission test system and a test method thereof, which overcome the defects in the prior art.
The invention provides the following technical scheme:
the invention provides a vehicle ammonia emission test system, comprising:
the flow testing device comprises a gas flow detection unit which is additionally arranged on a vehicle tail gas pipe, and the flow testing device measures the real-time flow of the vehicle tail gas through the gas flow detection unit;
and the ammonia emission sampling device is connected with the flow testing device and is used for measuring the real-time concentration of the ammonia pollutants in the vehicle tail gas, and the flow testing device and the ammonia emission sampling device are synchronously measured to obtain the real-time emission of the ammonia pollutants in the vehicle tail gas.
In some embodiments of the present application, the flow testing device further includes a first analysis unit, the first analysis unit is connected with the gas flow detection unit, the gas flow detection unit includes a first pipeline and a second pipeline, the first analysis unit is respectively disposed on the first pipeline and the second pipeline, the first analysis unit is configured to obtain an exhaust total pressure of the first pipeline and an exhaust static pressure of the second pipeline, and obtain a real-time flow of the vehicle tail gas through the exhaust total pressure and the exhaust static pressure.
In some embodiments of the present application, the gas flow detection unit is a pitot tube flowmeter, and a sampling hole is formed in the pitot tube flowmeter;
the ammonia emission sampling device comprises a first sampling unit and a second analysis unit, wherein the first sampling unit is arranged in the sampling hole, the first sampling unit is electrically connected with the second analysis unit, and the second analysis unit is used for measuring the real-time concentration of ammonia pollutants in the tail gas of the vehicle.
In some embodiments of the present application, the flow testing device further comprises a heating unit for heating the sampling hole and the air flow in the first sampling unit.
In some embodiments of the present application, the first sampling unit includes a sampling probe and a sampling pipeline, the sampling probe is disposed at the sampling hole and connected with the sampling pipeline;
the second analysis unit is an ammonia analyzer, and the ammonia analyzer is connected with the sampling pipeline.
In some embodiments of the present application, the vehicle ammonia emission test system further comprises a conventional contaminant sampling device including a dilution tunnel connected to the outlet end of the gas flow detection unit and a third analysis unit for measuring a conventional contaminant concentration within the dilution tunnel.
In some embodiments of the present application, the third analysis unit is a conventional contaminant analyzer.
In some embodiments of the present application, the conventional contaminant sampling device further includes a second sampling unit, where the second sampling unit is respectively connected to the dilution line and the third analysis unit, and is configured to obtain a predetermined volume of the conventional contaminant in the dilution line, and the third analysis unit performs concentration measurement on the predetermined volume of the conventional contaminant obtained by the second sampling unit.
In some embodiments of the present application, the vehicle ammonia emission test system further comprises a control device electrically connected to the flow test device, the ammonia emission sampling device, and the conventional contaminant sampling device, respectively.
The invention also provides a method for testing the ammonia emission of the vehicle, which comprises the following steps:
acquiring real-time flow of vehicle tail gas;
acquiring the real-time concentration of ammonia pollutants in the tail gas of the vehicle;
and calculating the real-time emission of the ammonia pollutants in the vehicle tail gas according to the acquired real-time flow of the vehicle tail gas and the real-time concentration of the ammonia pollutants in the vehicle tail gas.
Compared with the prior art, the beneficial effects of this application are: according to the vehicle ammonia emission testing system provided by the invention, the gas flow detection unit is arranged on the vehicle tail gas pipe, so that the real-time flow of the vehicle tail gas is measured. Meanwhile, the real-time concentration of the ammonia pollutants in the vehicle tail gas is measured through the ammonia emission sampling device, so that the vehicle tail gas is synchronously measured through the flow testing device and the ammonia emission sampling device, the emission flow of the vehicle tail gas and the ammonia concentration in the exhaust gas are measured in real time, the ammonia emission in the exhaust gas is measured, the time sequence error existing between the measurement of the ammonia emission of the vehicle tail gas and the flow measurement in the prior art is eliminated, the real-time emission of the ammonia pollutants in the vehicle tail gas can be accurately measured, the real-time feedback of the ammonia pollutant emission is realized, and the testing accuracy is improved.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 illustrates a schematic diagram of a vehicle ammonia emission test system in some embodiments of the invention;
FIG. 2 illustrates a schematic diagram of a vehicle ammonia emission test system in accordance with some embodiments of the invention;
FIG. 3 illustrates a flow chart of a method for measuring ammonia emissions from a vehicle in some embodiments of the invention.
Description of main reference numerals:
100-a vehicle ammonia emission measurement system; 110-a flow testing device; 111-a first analysis unit; 112-a gas flow detection unit; 1121-a first conduit; 1122-a second line; 113-a heating unit; 120-ammonia emission sampling device; 121-a first sampling unit; 1211-a sampling probe; 1212-sampling line; 122-a second analysis unit; 130-a conventional contaminant sampling device; 131-dilution line; 132-a third analysis unit; 133-a second sampling unit; 1331-a constant volume sampling system; 1332-air bags; 140-control means.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the templates herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 and 2 in combination, an embodiment of the present application provides a vehicle ammonia emission test system 100 for use in the field of vehicle exhaust monitoring.
The vehicle ammonia emission test system 100 includes a flow test device 110, an ammonia emission sampling device 120, a conventional contaminant sampling device 130, and a control device 140.
The flow rate testing device 110 comprises a gas flow rate detection unit 112 which is additionally arranged on a vehicle tail gas pipe, and the flow rate testing device 110 measures the real-time flow rate of the vehicle tail gas through the gas flow rate detection unit 112. The flow testing device 110 further comprises a first analysis unit 111, wherein the first analysis unit 111 is connected with the gas flow detection unit 112 to obtain total exhaust pressure and static exhaust pressure, and the real-time flow of the vehicle exhaust is obtained through the total exhaust pressure and the static exhaust pressure.
Specifically, the first analysis unit 111 is connected to the gas flow rate detection unit 112, the gas flow rate detection unit 112 includes a first pipe 1121 and a second pipe 1122, and the first analysis unit 111 is disposed on the first pipe 1121 and the second pipe 1122, respectively, for obtaining the total pressure of the exhaust gas in the first pipe 1121 and the static pressure of the exhaust gas in the second pipe 1122.
In this embodiment, the gas flow detecting unit 112 is a pitot tube flowmeter, the first pipeline 1121 is an H pipeline of the pitot tube flowmeter, the second pipeline 1122 is an L pipeline of the pitot tube flowmeter, the first analyzing unit 111 is connected to and measures a total exhaust pressure and a static exhaust pressure through the H pipeline and the L pipeline, and a real-time flow of the vehicle tail gas can be obtained through the total exhaust pressure and the static exhaust pressure. The gas flow rate detection unit 112 employed in the present embodiment has a measurement accuracy of full scale (4.5 m 3 /min or 10m 3 Per min), the structure can greatly improve the real-time measurement accuracy of the exhaust emission flow of the vehicle.
The ammonia emission sampling device 120 is connected to the flow testing device 110, and is used for measuring the real-time concentration of the ammonia pollutants in the vehicle tail gas, and the flow testing device and the ammonia emission sampling device are synchronously measured to obtain the real-time emission of the ammonia pollutants in the vehicle tail gas.
The gas flow detection unit 112 is provided with a sampling hole (not shown in the figure), the ammonia emission sampling device 120 includes a first sampling unit 121 and a second analysis unit 122, the first sampling unit 121 is disposed in the sampling hole and connected, and the first sampling unit 121 is electrically connected with the second analysis unit 122. This configuration enables the ammonia emission sampling device 120 to be coupled to the flow testing device 110 such that the ammonia emission sampling device 120 can measure the real-time concentration of ammonia pollutants in the vehicle exhaust.
More specifically, the first sampling unit 121 includes a sampling pipe 1212 and a sampling probe 1211 connected to the sampling pipe 1212, and the sampling probe 1211 is disposed in the sampling hole. In this embodiment, the gas flow rate detection unit 112 is different from the conventional pitot tube flowmeter in structure, the gas flow rate detection unit 112 in this embodiment is a conduit type, and the sampling probe 1211 is mounted on the sampling hole, so that the gas flow rate detection unit 112 is in communication with the sampling pipe 1212.
The second analysis unit 122 is an ammonia analyzer, and analyzes the ammonia concentration in the exhaust gas by using a non-spectroscopic infrared method, and is connected to the sampling pipe 1212 and measures the real-time concentration of the ammonia contaminant in the exhaust gas of the vehicle in the sampling pipe 1212. By means of the structure, the flow testing device 110 and the ammonia emission sampling device 120 can synchronously measure the vehicle tail gas, the situation that a time sequence error exists between the real-time flow and the real-time concentration is avoided, the real-time emission of ammonia pollutants in the vehicle tail gas emission can be accurately measured, and further the accurate real-time reflection of the ammonia pollutant emission is realized.
Furthermore, because ammonia is a gas which has strong polarity and is extremely soluble in water, the ammonia is prevented from being absorbed by water in the process of sampling, the loss of ammonia is reduced, and the data measured by the ammonia emission sampling device 120 is more accurate. The heating unit 113 heats and keeps the temperature of the air flow at the sampling hole and in the first sampling unit 121, so as to prevent condensed water at the sampling hole and reduce ammonia loss.
Since the sampling hole in this embodiment is disposed on the gas flow rate detection unit 112, the heating unit 113 heats and maintains the temperature of the exhaust gas of the vehicle in the gas flow rate detection unit 112 and the first sampling unit 121.
More specifically, a heating layer and a temperature controller that can be electrically heated are wrapped around the outside of the gas flow rate detection unit 112 and the first sampling unit 121. When the temperature controller detects that the temperature of the gas flow in the gas flow detection unit 112 and the first sampling unit 121 is lower than 105 ℃, the heating layer heats the gas flow in the gas flow detection unit 112 and the first sampling unit 121;
the heating unit 113 may further be configured to wrap the outer sides of the gas flow detecting unit 112 and the first sampling unit 121 by using a heat insulation layer made of a heat insulation material, and keep the interior of the gas flow detecting unit 112 and the interior of the first sampling unit 121 dry all the time by using the residual heat of the vehicle tail gas, so that the structure is simpler;
it will be appreciated that in other embodiments, infrared heating or a method of disposing a desiccant in the gas flow detecting unit 112 and the first sampling unit 121 may be used, and the main purpose of the method is to keep the inside of the sampling holes and the first sampling unit 121 dry, prevent condensed water from generating, and reduce ammonia loss, which falls within the scope of the present application.
The conventional pollutant sampling device 130 includes a dilution pipe 131, a second sampling unit 133, and a third analysis unit 132, where the dilution pipe 131 is connected to and communicated with the outlet end of the gas flow rate detection unit 112, and the conventional pollutant sampling device 130 is added, so that the vehicle exhaust enters the conventional pollutant sampling device 130 and the conventional pollutant concentration in the vehicle exhaust is measured by the conventional pollutant sampling device 130, thereby improving the practicability of the vehicle ammonia emission test system 100.
The third analysis unit 132 is a conventional contaminant analyzer for measuring conventional contaminant concentrations within the dilution tunnel. The specific implementation structure is as follows:
the inlet end of the second sampling unit 133 is connected to the dilution line 131, and the outlet end of the second sampling unit 133 is connected to the third analysis unit 132. Specifically, the second sampling unit 133 includes a constant volume sampling system 1331 and an air bag 1332.
Note that, in this embodiment, the constant volume sampling system 1331 is a CVS (Constant Volume System) constant volume sampling system. Of course, in other embodiments, the constant volume sampling system 1331 may employ other devices having constant volume sampling.
The third analysis unit 132 is connected to and performs conventional contaminant concentration measurements on the gas stream obtained by the second sampling unit 133. Specifically, the dilution pipe 131 dilutes the vehicle exhaust gas therein by air, and then obtains a preset volume of dilution gas from the constant volume sampling system 1331 to enter the air bag 1332, and the third analysis unit 132 analyzes carbon dioxide CO2, carbon monoxide CO, nitrogen oxides NOx and hydrocarbons THC of the dilution gas in the air bag 1332. Simultaneously, the concentrations of carbon dioxide and carbon monoxide are measured by a non-spectroscopic infrared method, the concentration of nitrogen oxides is measured by a chemiluminescence method, and finally the concentration of hydrocarbon is measured by a hydrogen ion flame method.
As an alternative, as mentioned above, the inlet end of the gas flow detecting unit 112 is attached to the tail gas pipe of the vehicle, the outlet end is connected to the dilution pipe 131, and the position of the sampling hole may be opened on the gas flow detecting unit 112 or a section of transition pipeline connected between the gas flow detecting unit 112 and the dilution pipe 131 may be added, and the sampling hole may be provided thereon.
The solution adopted in this embodiment is that the position of the sampling hole is disposed at one end of the gas flow detecting unit 112 near the tail gas pipe of the vehicle, so that the flow testing device 110 and the ammonia emission sampling device 120 can synchronously measure, and the situation that the real-time current flow and the real-time concentration have time sequence errors due to the fact that the distance difference exists when the tail gas of the vehicle enters the flow testing device 110 and the ammonia emission sampling device 120 respectively is reduced.
The control device 140 is electrically connected to the flow test device 110, the ammonia emission sampling device 120, and the conventional contaminant sampling device 130, respectively. The control device 140 sums and calculates data obtained by the flow rate testing device 110, the ammonia emission sampling device 120, and the regular pollutant sampling device 130, thereby obtaining real-time emission of ammonia pollutants and concentration of regular pollutants generated during the driving of the vehicle.
Referring to fig. 3 in combination, an embodiment of the present invention further provides a method for testing the ammonia emission of a vehicle, which includes:
s100: acquiring real-time flow of the tail gas of the vehicle through the flow testing device 110;
s200: synchronously with the step S100, acquiring the real-time concentration of ammonia pollutants in the tail gas of the vehicle through the ammonia emission sampling device 120;
s300: and calculating the real-time emission of the ammonia pollutants in the vehicle tail gas according to the acquired real-time flow of the vehicle tail gas and the real-time concentration of the ammonia pollutants in the vehicle tail gas.
By the method, the flow testing device 110 and the ammonia emission sampling device 120 can synchronously measure, so that when the vehicle tail gas respectively enters the flow testing device 110 and the ammonia emission sampling device 120, the situation that the time sequence error exists between the real-time current flow and the real-time concentration is reduced, the real-time emission of ammonia pollutants in the vehicle tail gas emission can be accurately measured, the real-time feedback of the ammonia pollutant emission is realized, and the testing accuracy is improved.
In summary, in the vehicle ammonia emission test system 100 according to the embodiment of the invention, the gas flow detection unit 112 is installed on the exhaust pipe of the vehicle, so as to measure the real-time flow of the exhaust gas of the vehicle. Meanwhile, the real-time concentration of the ammonia pollutants in the vehicle tail gas is measured through the ammonia emission sampling device 120, so that the vehicle tail gas is synchronously measured through the flow testing device 110 and the ammonia emission sampling device 120, the emission flow of the vehicle tail gas and the ammonia concentration in the exhaust gas are measured in real time, the ammonia emission in the exhaust gas is measured, the time sequence error existing between the measurement of the ammonia emission of the vehicle tail gas and the flow measurement in the prior art is eliminated, the real-time emission of the ammonia pollutants in the vehicle tail gas can be accurately measured, the real-time feedback of the ammonia pollutant emission is realized, and the testing accuracy is improved.
Any particular values in all examples shown and described herein are to be construed as merely illustrative and not a limitation, and thus other examples of exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
The above examples merely represent a few embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the present invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (6)
1. A vehicle ammonia emission test system, comprising:
the flow testing device comprises a gas flow detection unit which is additionally arranged on a vehicle tail gas pipe, and the flow testing device measures the real-time flow of the vehicle tail gas through the gas flow detection unit;
the ammonia emission sampling device is connected with the flow testing device and is used for measuring the real-time concentration of ammonia pollutants in the vehicle tail gas, and the flow testing device and the ammonia emission sampling device are synchronously measured to obtain the real-time emission of the ammonia pollutants in the vehicle tail gas;
the gas flow detection unit is a pitot tube flowmeter, and a sampling hole is formed in the pitot tube flowmeter;
the ammonia emission sampling device comprises a first sampling unit and a second analysis unit, wherein the first sampling unit is arranged in the sampling hole, the first sampling unit is electrically connected with the second analysis unit, and the second analysis unit is used for measuring the real-time concentration of ammonia pollutants in the tail gas of the vehicle;
the vehicle ammonia emission test system further comprises a conventional pollutant sampling device, wherein the conventional pollutant sampling device comprises a dilution pipeline and a third analysis unit, the dilution pipeline is connected to the outlet end of the gas flow detection unit, and the third analysis unit is used for measuring the conventional pollutant concentration in the dilution pipeline;
the conventional pollutant sampling device further comprises a second sampling unit, wherein the second sampling unit is respectively connected with the dilution pipeline and the third analysis unit and is used for acquiring conventional pollutants with preset volumes in the dilution pipeline, and the third analysis unit is used for measuring the concentration of the conventional pollutants with preset volumes acquired by the second sampling unit;
the second sampling unit comprises a constant volume sampling system and an air bag, the dilution pipeline dilutes the vehicle tail gas in the dilution pipeline by adopting air, then the diluting gas with the preset volume is obtained through the constant volume sampling system and enters the air bag, and the third analysis unit analyzes the diluting gas in the air bag.
2. The vehicle ammonia emission test system according to claim 1, wherein the flow test device further comprises a first analysis unit connected to the gas flow detection unit, the gas flow detection unit comprises a first pipe and a second pipe, the first analysis unit is disposed on the first pipe and the second pipe, respectively, the first analysis unit is configured to obtain a total exhaust pressure of the first pipe and a static exhaust pressure of the second pipe, and obtain a real-time flow of the vehicle exhaust gas from the total exhaust pressure and the static exhaust pressure.
3. The vehicle ammonia emission test system of claim 1, wherein the flow test device further comprises a heating unit for heating the sampling bore and the air flow within the first sampling unit.
4. The vehicle ammonia emission test system of claim 3, wherein the first sampling unit comprises a sampling probe and a sampling line, the sampling probe being disposed at the sampling aperture and connected to the sampling line;
the second analysis unit is an ammonia analyzer, and the ammonia analyzer is connected with the sampling pipeline.
5. The vehicle ammonia emission test system of claim 1, wherein the third analysis unit is a conventional pollutant analyzer.
6. The vehicle ammonia emission test system of claim 1, further comprising a control device electrically connected to the flow test device, the ammonia emission sampling device, and the conventional contaminant sampling device, respectively.
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| US6623975B1 (en) * | 2000-05-09 | 2003-09-23 | Gordon-Darby Systems, Inc. | Method and system for vehicle emission testing |
| CN201413238Y (en) * | 2009-06-25 | 2010-02-24 | 天津市圣威科技发展有限公司 | Automobile emission detecting system with simple transient working condition |
| CN105806627A (en) * | 2016-03-15 | 2016-07-27 | 南京汽车集团有限公司 | Vehicle-mounted emission testing device and testing method thereof |
| CN106525154A (en) * | 2016-09-30 | 2017-03-22 | 张英志 | Measurement device for tail gas flow exhausted by car under actual driving condition |
| CN108181432B (en) * | 2017-12-28 | 2021-02-26 | 清华大学 | Method for testing full-component emission of motor vehicle exhaust pollutants |
| CN207649910U (en) * | 2017-12-28 | 2018-07-24 | 清华大学 | A kind of modular pollutant of vehicle exhaust on-board emission test platform |
| CN209783996U (en) * | 2019-01-18 | 2019-12-13 | 北京大学 | vehicle-mounted test platform for motor vehicle exhaust based on dynamic dilution method |
| CN110531036A (en) * | 2019-09-30 | 2019-12-03 | 华南理工大学 | Motor-vehicle tail-gas real-time detecting system |
| CN215263401U (en) * | 2021-07-15 | 2021-12-21 | 淄博青禾检测科技有限公司 | Portable emission test system |
| CN217687307U (en) * | 2022-04-06 | 2022-10-28 | 山西立德佳检测科技有限公司 | Synchronous measuring device for waste gas moisture content, particulate matter sampling flow and waste gas discharge amount of fixed pollution source |
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