CN109855921B - Intelligent sampling device and sampling method for measuring intermediate products in different areas of fuel combustion - Google Patents
Intelligent sampling device and sampling method for measuring intermediate products in different areas of fuel combustion Download PDFInfo
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Abstract
The invention belongs to the technical field of internal combustion engine testing, and relates to an intelligent sampling device and method for measuring intermediate products in different areas of fuel combustion; the device comprises a sampling gas guide tube, a thermocouple, a sliding support, an electromagnetic flowmeter, a cooling tube, a PLC (programmable logic controller), a miniature suction pump, an electromagnetic valve B, a branch tube, a glass fiber filter membrane, an electromagnetic valve A, a silicon piezoresistive micro-pressure sensor and a sampling bag; the specific operation is as follows: selecting a measuring position and placing a device; starting a PLC controller, working a micro air pump, starting an electromagnetic valve B, and cleaning a sampling air duct; closing the electromagnetic valve B, opening the electromagnetic valve A, and starting to collect products by the sampling bag and the glass fiber filter membrane; the thermocouple, the silicon piezoresistive micro-pressure sensor and the electromagnetic flowmeter feed back real-time signals to the PLC, the PLC is adopted to control sampling time, sampling flow and sampling pressure, intelligent sampling of fuel oil combustion gas and solid intermediate products with different flame heights is achieved, sampling precision is guaranteed, and intelligent sampling is achieved.
Description
Technical Field
The invention belongs to the technical field of internal combustion engine testing, and particularly relates to an intelligent sampling device and a sampling method for measuring intermediate products in different areas of fuel combustion.
Background
Liquid fuels such as diesel oil and the like are main power sources of motor vehicles in China, and are widely applied to industrial machinery such as automobiles, agricultural machinery, engineering machinery, ships, railway locomotives and the like. Studies have shown that heavy duty trucks based on diesel fuel are one of the major sources of PM emissions. Generally, the process of burning fuel from liquid phase to gas phase to solid phase to form particles is very complicated, and comprises stages of fuel cracking, cyclization reaction, gas-solid conversion, particle growth and the like. In order to research the formation process of particles, domestic and foreign scholars deeply research intermediate products of different combustion states of fuel oil and particle formation ways, wherein gas-phase and solid-phase substances as combustion intermediate products are the key points of particle formation, and the sampling device aims to adopt an intelligent sampling device to collect the intermediate products in different areas of fuel oil combustion so as to provide conditions for further revealing the relationship between the combustion products and the Particles (PM) and providing a method for reducing the PM of a diesel engine.
The principle of the existing sampling device is that a mechanical or electronic system is adopted to control the opening and closing of a sampling valve to collect combustion products after combustion is finished at an exhaust valve, the sampling device is mostly solid particles, even if some sampling devices for combustion intermediate products are provided, the sampling device does not have the advantages of simple structure, stable control, intelligent and convenient sampling and the like.
Disclosure of Invention
In view of the deficiencies of the prior art, the present invention is directed to solving one of the problems; because the flame formed by fuel combustion has obvious rising and can be divided into a flame core, inner flame and outer flame, in order to reasonably collect combustion intermediate products and accurately measure displacement, a plurality of positions can be selected as measuring points, and the plurality of measuring points correspond to the positions of a plurality of sampling gas guide pipes and thermocouples; the invention provides an intelligent sampling device for measuring intermediate products in different areas of fuel combustion, which can automatically adjust the number and the positions of measuring points according to actual conditions.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the invention firstly provides an intelligent sampling device for measuring intermediate products in different areas of fuel combustion, which comprises a plurality of sampling gas guide pipes, thermocouples, a sliding support, an electromagnetic flowmeter, a cooling pipe, a PLC (programmable logic controller), a miniature air suction pump, an electromagnetic valve B, a branch pipe, a glass fiber filter membrane, an electromagnetic valve A, a silicon piezoresistive micro-pressure sensor and a sampling bag;
the sampling air guide pipes are vertically arranged in parallel, one end of each sampling air guide pipe is provided with a thermocouple and is arranged in the combustion flame for detecting temperature, and the other end of each sampling air guide pipe is connected with a sampling bag; the silicon piezoresistive micro-pressure sensor is arranged at the joint of the sampling bag and the sampling air duct;
the sliding bracket is vertically connected with the sampling air duct; the thermocouple is sequentially connected with an electromagnetic flowmeter, a cooling pipe, a miniature air pump, a branch pipe and a glass fiber filter membrane through a sampling air guide pipe;
a branch pipe is arranged at the branch pipe and communicated with the outside air; the branch pipe is provided with an electromagnetic valve B;
the electromagnetic valve A is arranged between the glass fiber filter membrane and the sampling bag;
the PLC is sequentially connected with the electromagnetic flowmeter and the electromagnetic valve A in series;
and the thermocouple, the electromagnetic valve B and the miniature air pump are connected with the PLC through the electromagnetic flowmeter and the electromagnetic valve A.
The number of the sliding supports is not less than 1.
The diameter of the sampling air guide pipe is a straight long pipe with the diameter of 1.5-2.5 mm, and the sampling air guide pipe is high-temperature resistant and used for conveying sampling gas.
The electromagnetic flowmeter detects the flow velocity of the gas in the sampling gas guide pipe and according to a formula P0＝(V2*L)/(C2R) calculating the pressure value P at the position0(ii) a Where V is the gas flow velocity in the tube, R is the tube radius, L is the airway length, and C is a coefficient where the coefficient C is R(1/6)And n is the wall surface roughness, and the value range of n is 0.011 to 0.014.
The sampling bag is a material bag made of rubber, the volume in the bag is 0.8-1.2L, and the opening of the bag is a circular bottle opening with the diameter of 6-8 mm, so that the sampling bag is conveniently connected with a sampling gas detection instrument.
The flow rate range of the micro air pump is 0.2-1L/min.
The silicon piezoresistive micro-pressure sensor comprises a force-sensitive structure used for detecting the pressure in the sampling bag; the force sensitive structure is a double-guide-beam membrane structure, when pressure acts on the pressure sensing membrane, the pressure sensing membrane deforms, the resistance value changes due to the piezoresistive effect, and the formula is used
And calculating to obtain a pressure value P, wherein P is the pressure applied on the diaphragm, h is the thickness of the diaphragm, c is the side length of the diaphragm, and v is a linearity parameter.
The PLC controller consists of an ARM programmable chip and a programmed control unit.
The invention also provides a sampling method of the intelligent sampling device for the combustion intermediate products of different flame heights of the fuel oil, which comprises the following steps:
step 1: firstly, selecting a measuring position according to different combustion areas, and placing a sampling device; then pressing a PLC controller switch; the micro air pump works, and the electromagnetic valve B is opened; the sampling gas guide tube starts to collect gas, and the thermocouple and the electromagnetic flowmeter feed back real-time signals to the PLC;
step 2: the electromagnetic flowmeter detects the flow velocity of the gas in the sampling gas guide pipe through a formula P0＝(V2*L)/(C2R) to obtain the pressure value P at the sampling air duct0(ii) a Where V is the gas flow velocity in the tube, R is the tube radius, L is the airway length, and C is a coefficient where the coefficient C is R(1/6)N is the wall surface roughness, and the value range is 0.011 to 0.014;
and step 3: the pressure value P in the sampling bag is detected by a silicon piezoresistive micro-pressure sensor, and the calculation formula is
In the formula, p is the pressure applied on the diaphragm, h is the thickness of the diaphragm, c is the side length of the diaphragm, and v is a linearity parameter;
and 4, step 4: according to P obtained in step 2 and step 30And P, controlling by a PLC controller: when P is present0<When the pressure is 2P, the flow rate of the micro air pump is increased until the pressure is P0When the flow rate is 2P, the micro air pump operates at the current constant flow rate, and meanwhile, the electromagnetic valve B is closed and the electromagnetic valve A is opened; wait for P>1.5P0And closing the electromagnetic valve A, opening the electromagnetic valve B at the same time, cleaning the sampling air guide pipe, and closing the electromagnetic valve B after running for five minutes, so that the miniature air pump stops working, and sampling is completed.
The invention has the beneficial effects that:
the intelligent sampling device for measuring the intermediate products in different areas of fuel combustion is used for collecting the intermediate products of fuel oil mainly comprising diesel oil in different combustion stages, and the device can select different test points according to the characteristics of combustion flame and can accurately represent different combustion stages; meanwhile, considering that fuel oil combustion is a complex process of forming particles from a liquid phase to a gas phase and then to a solid phase, the fuel oil attribute is evaluated by sampling and researching combustion intermediate products, and the fuel oil products are analyzed. The sampling process comprises the simultaneous sampling of solid and gaseous combustion intermediate products, a PLC is adopted, control methods such as sampling time, flow and pressure are provided according to different stages of fuel oil combustion, and the gas and solid intermediate products in different areas of the fuel oil combustion are intelligently and accurately sampled. The invention has the advantages of simple structure of the sampling device, comprehensive sampling, intelligent operation and the like.
Drawings
Fig. 1 is a schematic structural diagram of an intelligent sampling device for measuring intermediate products in different areas of fuel combustion.
Fig. 2 is a specific control flow chart of the PLC controller of the intelligent control system.
Wherein 1, sampling gas-guide tube; 2-a thermocouple; 3-a sliding support; 4-an electromagnetic flow meter; 5-a cooling pipe; 6-a PLC controller; 7-a micro air pump; 8-electromagnetic valve B; 9-a manifold; 10-glass fiber filter membrane; 11-electromagnetic valve A; 12-silicon piezoresistive micro-pressure sensors; 13-a sampling bag; 14-combustion flame.
Detailed Description
The invention is further described with reference to the accompanying drawings, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The intelligent sampling device and the sampling method for measuring the intermediate products in different areas of fuel combustion are specifically described in the following by combining schematic diagrams. Because the flame formed by fuel combustion has obvious rising and can be divided into a flame core, inner flame and outer flame, in order to reasonably collect combustion intermediate products and accurately measure displacement, a plurality of positions can be selected as measuring points, and the plurality of measuring points correspond to the positions of a plurality of sampling gas guide pipes and thermocouples; the intelligent sampling device for measuring the intermediate products in different areas of fuel combustion provided by the invention can automatically adjust the number and the positions of the measuring points according to the actual conditions.
The invention selects five measuring points, as shown in figure 1, an intelligent sampling device for the combustion intermediate products of different flame heights of fuel oil comprises: the device comprises a sampling gas guide tube 1, a thermocouple 2, a sliding support 3, an electromagnetic flowmeter 4, a cooling tube 5, a PLC (programmable logic controller) 6, a micro air pump 7, an electromagnetic valve B8, a branch tube 9, a glass fiber filter membrane 10, an electromagnetic valve A11, a silicon piezoresistive micro-pressure sensor 12 and a sampling bag 13.
The number of the sliding supports 3 is 2, the sliding supports are respectively and vertically connected with the sampling air guide tube 1 at 1/3 and 2/3 which are away from the thermocouple 2, the height and the distance of the sampling air guide tube 1 are adjusted, and the proper height and distance are selected for sampling according to requirements.
The five sampling air guide tubes 1 are straight long tubes with the diameter of 1.5-2.5 mm, are high-temperature resistant and are used for conveying sampling gas.
The thermocouple 2 is sequentially connected with an electromagnetic flowmeter 4, a cooling pipe 5, a miniature air pump 7, a branch pipe 9 and a glass fiber filter membrane 10 through a sampling air guide pipe (1);
a branch pipe is arranged at the branch pipe 9 and is communicated with the outside air; the branch pipe is provided with an electromagnetic valve B8;
the PLC 6 is sequentially connected with the electromagnetic flowmeter 4 and the electromagnetic valve A11 in series; and the thermocouple 2, the electromagnetic valve B8 and the micro air pump 7 are connected with the PLC 6 through the electromagnetic flowmeter 4 and the electromagnetic valve A11.
The five thermocouples 2 are arranged on the surface of the front end of the sampling gas-guide tube 1 and are used for measuring the flame temperature; the thermocouple 2 is a thin-diameter thermocouple and is sleeved with a thin and long ceramic tube, so that the heat conductivity coefficient can be reduced, the heat release coefficient of flame to a thermocouple junction is improved, and the heat conduction loss is reduced.
The five electromagnetic flowmeters 4 detect the flow velocity of the gas in the sampling gas guide tube 1 and according to a formula P0＝(V2*L)/(C2R) (M1) can calculate the pressure value P at which it is located0Wherein V is the gas flow velocity in the gas conduit, R is the conduit radius, C is the coefficient, and C is R(1/6)And/n, wherein L is the length of the gas guide tube, and n is the wall surface roughness and has the value range of 0.011-0.014.
The five cooling pipes 5 are cooling devices and are used for reducing the gas temperature in the sampling gas guide pipe 1 and preventing the sampling bag 13 from being damaged due to overhigh gas temperature.
The five glass fiber filter membranes 10 are used for filtering, adsorbing and collecting solid combustion intermediate products in the sampled gas, and after the experiment is finished, the glass fiber filter membranes 10 are extracted to obtain solid particles of the combustion intermediate products for experimental research.
The flow speed range of the micro air pump 7 is 0.2-1L/min.
The sampling bag 13 is a material bag made of rubber, the volume in the bag is 1L, and the opening of the bag is a circular bottle opening with the diameter of 6-8 mm, so that a sampling gas detection instrument can be conveniently connected.
The silicon piezoresistive micro-pressure sensor 12 comprises a force sensitive structure and is used for detecting the pressure in the sampling bag 13; the force sensitive structure is a double-guide beam membrane structure, when pressure acts on the pressure sensing membrane, the pressure sensing membrane deforms, and the resistance value changes due to the piezoresistive effect, and the formula is used
(M2) the calculation may yield a pressure value.
As shown in fig. 2, the PLC 6 receives and displays the temperature parameter T of the thermocouple 2, the flow velocity V of the electromagnetic flowmeter 4, and the pressure parameter P of the silicon piezoresistive micro-pressure sensor 12, and calculates the pressure value P of the airway according to the above formula0The PLC controller edits the program and the control unit: when P is present0<When the pressure is 2P, the flow rate of the micro air pump is increased until the pressure is P0When the current constant flow rate is 2P, the micro air pump operates at the current constant flow rate, the electromagnetic valve B is closed, the electromagnetic valve A is opened, and the micro air pump operates at the current constant flow rate until P>1.5P0When the micro-pressure sensor is used, the electromagnetic valve A11 where the silicon piezoresistive micro-pressure sensor 12 is located is closed, the electromagnetic valve B8 is opened at the same time, after the micro-pressure sensor runs for five minutes, the electromagnetic valve B8 where the silicon piezoresistive micro-pressure sensor is located is closed, the micro-suction pump 7 stops working, the sampling of the sampling bag 13 and the glass fiber filter membrane 10 is completed, other groups of sampling devices continue to work until all five groups of micro-suction pumps 7 stop working, and the sampling is completed. If the test needs, five groups of separate tests can be realized.
The working process and the installation method of the device are characterized in that the sampling device is installed firstly, and the device is checked to be reliably fixed, and the specific operation comprises the following steps:
step 1: firstly, selecting a measuring position according to different combustion areas, and placing a sampling device;
step 2: pressing a switch of the PLC 6;
and step 3: the micro air pump 7 works, and the electromagnetic valve B8 is opened;
and 4, step 4: the thermocouple 2 and the electromagnetic flowmeter 4 feed back real-time signals, and the real-time signals are calculated through formulas (M1) and (M2)Go out of P0And P, when P0<2P, increasing the flow rate of the micro air pump 7; up to P0When the current constant flow rate is 2P, the micro air pump 7 is operated, and meanwhile, the solenoid valve B8 is closed, and the solenoid valve a11 is opened; wait for P>1.5P0When the sampling gas guide pipe 1 is cleaned, the electromagnetic valve A11 is closed, the electromagnetic valve B8 is opened, and the sampling gas guide pipe 1 is cleaned;
and 5: after five minutes of operation, the solenoid valve B8 is closed, the micro air pump 7 stops working, and the sampling bag 13 and the glass fiber filter membrane 10 finish sampling.
The above description provides a detailed description of the intelligent sampling device and the sampling method for measuring the intermediate products in different areas of fuel combustion, and the principle and the implementation of the present invention are explained by applying specific examples, it should be noted that the above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Any modification and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A sampling method of an intelligent sampling device for combustion intermediate products of fuel oil with different flame heights is characterized by comprising the following steps:
step 1: firstly, selecting a measuring position according to different combustion areas, and placing a sampling device; then, the PLC controller (6) is started, the micro air pump (7) starts to work, and the electromagnetic valve B (8) is started; the thermocouple (2) and the electromagnetic flowmeter (4) feed back real-time signals to the PLC (6);
step 2: the electromagnetic flow meter (4) detects the flow velocity of the gas in the sampling gas guide tube (1) through a formula
Calculating to obtain a pressure value P at the sampling air duct (1)0(ii) a Where V is the gas flow velocity in the tube, R is the tube radius, L is the airway length, and C is a coefficient, where the coefficient
N is the wall surface roughness, and the value range is 0.011 to 0.014;
and step 3: then the pressure p in the sampling bag (13) is detected by a silicon piezoresistive micro-pressure sensor (12), and the formula is calculated
In the formula
Is the pressure to which the diaphragm is subjected, h is the thickness of the diaphragm, c is the side length of the diaphragm,
is a linearity parameter;
and 4, step 4: according to P obtained in step 2 and step 30And P, the PLC controller (6) controls: when P is present0<At 2P, the flow speed of the micro air pump (7) is increased until P0When the flow rate is not less than 2P, the micro air pump (7) operates at the current constant flow rate, meanwhile, the electromagnetic valve B (8) is closed, and the electromagnetic valve A (11) is opened; wait for P>1.5P0And when the sampling air guide pipe (1) is cleaned, the electromagnetic valve B (8) is closed, the electromagnetic valve A (11) is opened, and the micro air pump (7) stops working after the sampling air guide pipe (1) runs for five minutes, so that the sampling is finished.
2. The sampling method of the intelligent sampling device for the fuel oil combustion intermediate products with different flame heights is characterized by comprising a plurality of sampling air guide pipes (1), thermocouples (2), a sliding support (3), an electromagnetic flow meter (4), a cooling pipe (5), a PLC (programmable logic controller) controller (6), a micro air pump (7), an electromagnetic valve B (8), a branch pipe (9), a glass fiber filter membrane (10), an electromagnetic valve A (11), a silicon piezoresistive micro-pressure sensor (12) and a sampling bag (13);
the sampling gas-guide pipes (1) are arranged in parallel up and down, and one end of each sampling gas-guide pipe (1) is provided with a thermocouple (2) and is arranged in the combustion flame (14); the other end is connected with a sampling bag (13); the silicon piezoresistive micro-pressure sensor (12) is arranged at the joint of the sampling bag (13) and the sampling air duct (1);
the sliding bracket (3) is vertically connected with the sampling air duct (1); the thermocouple (2) is sequentially connected with an electromagnetic flowmeter (4), a cooling pipe (5), a miniature air pump (7), a branch pipe (9) and a glass fiber filter membrane (10) through a sampling air guide pipe (1);
a branch pipe is arranged at the branch pipe (9) and is communicated with the outside air; the branch pipe is provided with an electromagnetic valve B (8); the electromagnetic valve A (11) is arranged between the glass fiber filter membrane (10) and the sampling bag (13);
the PLC controller (6) is sequentially connected with the electromagnetic flowmeter (4) and the electromagnetic valve A (11) in series; and the thermocouple (2), the electromagnetic valve B (8) and the miniature air pump (7) are connected with the PLC (6) through the electromagnetic flowmeter (4) and the electromagnetic valve A (11).
3. The sampling method of the intelligent sampling device for the combustion intermediate products of different flame heights of the fuel oil as claimed in claim 2, characterized in that the number of the sliding supports (3) is not less than 1; the sampling gas guide pipe (1) is a straight long pipe with the diameter of 1.5-2.5 mm and used for conveying sampling gas.
4. The sampling method of the intelligent sampling device for the combustion intermediate products with different flame heights of the fuel oil according to claim 2, characterized in that the electromagnetic flow meter (4) is used for detecting the flow velocity V of the gas in the sampling gas guide pipe (1) and is used for sampling the gas according to a formula
Calculating a pressure value P0(ii) a Where V is the gas flow velocity in the tube, R is the tube radius, L is the airway length, and C is a coefficient, where the coefficient
And n is the wall surface roughness and has a value range of 0.011 to 0.014.
5. The sampling method of the intelligent sampling device for the combustion intermediates of the fuel oil with different flame heights as claimed in claim 2, wherein the sampling bag (13) is made of rubber, the volume of the sampling bag is 0.8-1.2L, and the opening of the sampling bag (13) is a circular bottle opening with the diameter of 6-8 mm.
6. The sampling method of the intelligent sampling device for the fuel oil combustion intermediate products with different flame heights as claimed in claim 2, characterized in that the flow speed range of the micro air pump (7) is 0.2-1L/min.
7. The sampling method of the intelligent sampling device of the fuel oil different flame height combustion intermediate products is characterized in that the silicon piezoresistive micro-pressure sensor (12) comprises a force-sensitive structure and is used for detecting the pressure in the sampling bag (13); by the formula
Calculating a pressure value P, wherein
Is the pressure to which the diaphragm is subjected, h is the thickness of the diaphragm, c is the side length of the diaphragm,
is a linearity parameter.
8. The sampling method of the intelligent sampling device for the combustion intermediate products with different flame heights of the fuel oil as claimed in claim 2, characterized in that the PLC controller (6) is composed of an ARM programmable chip and a control unit.
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| CN113503909B (en) * | 2021-05-19 | 2023-03-14 | 湖南华电云通电力技术有限公司 | Extra-high voltage converter transformer on-line monitoring device |
| CN115307965B (en) * | 2022-09-29 | 2022-12-16 | 山西豪盛环保科技有限公司 | Soil stratified sampling is with preventing cross contamination drilling equipment |
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| US6062092A (en) * | 1998-09-09 | 2000-05-16 | Engine, Fuel, And Emissions Engineering, Incorporated | System for extracting samples from a stream |
| CN203376186U (en) * | 2012-12-28 | 2014-01-01 | 北京工业大学 | Sampling system |
| CN204085969U (en) * | 2014-10-13 | 2015-01-07 | 北京市环境保护科学研究院 | Gasoloid isokinetic sampling device in speed change air-flow |
| CN105806755B (en) * | 2014-12-31 | 2019-11-12 | 上海北分科技股份有限公司 | A kind of flue gas inspection equipment |
| CN204422292U (en) * | 2015-02-09 | 2015-06-24 | 云南中烟工业有限责任公司 | A kind of full-automatic cigarette is by mouth flue gas gas collection bag gathering-device |
| CN106289882B (en) * | 2016-07-19 | 2018-09-18 | 天津大学 | A kind of laboratory flames quartz probe on-line period system and sampling method |
| CN106442031A (en) * | 2016-10-13 | 2017-02-22 | 北京市环境保护监测中心 | Automatic sampling device for malodorous gas |
| CN206756537U (en) * | 2017-03-27 | 2017-12-15 | 天津迪兰奥特环保科技开发有限公司 | A kind of escaping gas sampler of adjustable flow velocity |
| CN108287091A (en) * | 2018-03-26 | 2018-07-17 | 中国科学技术大学 | Sampling apparatus and the method for sampling a kind of while that acquire exhaust emission source graded particie object and gas phase organic matter |
| CN209589599U (en) * | 2018-11-22 | 2019-11-05 | 江苏大学 | A kind of intellegent sampling device measuring fuel burning different zones intermediate product |
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