CN114323815A - Portable fixed source can condense particulate matter and VOCs dilution sample thief - Google Patents
Portable fixed source can condense particulate matter and VOCs dilution sample thief Download PDFInfo
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- CN114323815A CN114323815A CN202011085852.7A CN202011085852A CN114323815A CN 114323815 A CN114323815 A CN 114323815A CN 202011085852 A CN202011085852 A CN 202011085852A CN 114323815 A CN114323815 A CN 114323815A
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- 238000010790 dilution Methods 0.000 title claims abstract description 74
- 239000012895 dilution Substances 0.000 title claims abstract description 74
- 239000013618 particulate matter Substances 0.000 title claims abstract description 29
- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 26
- 239000007921 spray Substances 0.000 claims abstract description 14
- 238000005485 electric heating Methods 0.000 claims abstract description 9
- 238000005070 sampling Methods 0.000 claims description 32
- 238000002156 mixing Methods 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000001179 sorption measurement Methods 0.000 claims description 8
- 230000003068 static effect Effects 0.000 claims description 8
- 238000009792 diffusion process Methods 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 235000020354 squash Nutrition 0.000 claims description 3
- 239000002245 particle Substances 0.000 abstract description 18
- 238000000034 method Methods 0.000 description 14
- 230000008569 process Effects 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000007865 diluting Methods 0.000 description 2
- 238000004710 electron pair approximation Methods 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000002444 silanisation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000004887 air purification Methods 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 238000003113 dilution method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000008821 health effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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Abstract
The invention provides a portable fixed-source dilution sampler for coagulable particles and VOCs. The portable fixed-source condensable particulate matter and VOCs dilution sampler comprises a host; the dilution device is arranged on the top side of the main machine and comprises a staying chamber and a spray head assembly, and the spray head assembly is arranged on one side of the staying chamber; the electric heating sleeve is sleeved on the spray head assembly; a pitot tube mounted on a side of the dilution device. The portable fixed-source condensable particulate matter and VOCs dilution sampler provided by the invention has the advantages of compact structure and convenience in carrying.
Description
Technical Field
The invention relates to the technical field of air purification, in particular to a portable fixed-source dilution sampler for condensable particulate matters and VOCs.
Background
Researchers in the united states in the 80-90 s of the 20 th century have first developed a flue gas dilution channel sampling method. The dilution sampling method before the middle of the 80's of the 20 th century focused on the mass concentration of the particulate matter emitted from the combustion source, and then focused on the particle size and chemical composition of the particulate matter emitted from the combustion source in consideration of the health effect of the particulate matter. With the development of the analysis research of the environmental air particulate matter source, in order to construct a more real fixed source emission particulate matter source spectrum, more and more scientists adopt a dilution channel sampling method to collect fixed source particulate matter samples.
The main device of the dilute sampling method, called the dilution channel, is the most critical part of the method. The main parameters of the dilution tunnel include dilution ratio, residence time and mixing section reynolds number. The dilution tunnel principle is relatively simple. Various dilution channels are designed by various scholars according to needs, such as positive pressure dilution and negative pressure dilution. In order to ensure that the flue gas and the diluent gas are fully mixed, the dilution channel mostly adopts a turbulent mixing mode. The dilution process is a dynamic process of interaction of volatile and semi-volatile substances with particles and particles, including nucleation, condensation and coalescence, and sufficient residence time is required to ensure that the particle size distribution of the particles is stable.
At present, no standard method related to a fixed source dilution channel sampling method exists in China. The international organization for standardization (ISO) abroad and the EPA in the united states have been explored for many years, and proposed by taking a portable dilution channel designed by England as a prototype, and proposed the standards of a dilution sampling Method, namely ISO25597:2013 and EPA Method CTM-039.
According to the ISO method, a PM2.5-PM10 two-stage cyclone sampler is used for removing particles with aerodynamic diameters larger than 2.5 microns in flue gas, then a cyclone sampler is used for removing particles with aerodynamic diameters larger than 2.5 microns after dilution and condensation, then a filter membrane is used for collection, and finally weighing is carried out. The standard specifies in detail that the dilution channel parameters are such that the dilution ratio is greater than or equal to 20:1, the residence time is not less than 10s, the temperature at the membrane after dilution is less than or equal to 42 ℃, and the relative humidity is less than 70%.
The industry common problem is as follows: the comprehensive analysis of the condition of PM2.5 inverse hanging in the sampling process of the dilution channel adopted at present in China has the following points:
(precondition: the impinging cutter/cyclone cutter channel flow operates stably and accurately in the sampling process, the airtightness is good, and the following analysis is made.)
1. The coal-fired boiler in China mostly adopts a semi-dry desulfurization process, and the water vapor and the moisture content in the flue are high;
2. the dilution sampling technology needs to simulate a real natural environment and needs natural cooling, so that more pipeline condensate water is produced in the sampling process;
3. at present, most coal-fired boilers in China generally implement ultra-low emission standards, the sampling time is long when the sampling analysis amount is reached, and the large particle loss amount is large in the environment with high moisture content;
4. based on the national conditions of China, the matching problem of test units is difficult to be solved on site according to international ISO: 25597, 2013 standard parameter setting execution;
5. at high moisture content, it is possible that no sample can be collected.
Therefore, there is a need to provide a new portable fixed-source dilutable particulate matter and VOCs sampler that solves the above-mentioned problems.
Disclosure of Invention
The invention solves the technical problem of providing a portable fixed-source condensable particulate matter and VOCs dilution sampler which is compact in structure and convenient to carry.
In order to solve the technical problem, the portable fixed-source condensable particulate matter and VOCs dilution sampler provided by the invention comprises:
a host;
the dilution device is arranged on the top side of the main machine and comprises a staying chamber and a spray head assembly, and the spray head assembly is arranged on one side of the staying chamber;
the electric heating sleeve is sleeved on the spray head assembly;
a pitot tube mounted on a side of the dilution device.
Preferably, the host computer includes the host computer shell, LCD screen and control panel are installed to one side of host computer shell, install temperature control display, admit air and protect controller, zero air heating controller, sampling tank, 5V switching power supply, 12V switching power supply, 24V switching power supply, sampling flow control valve, first flow control valve, second flow control valve, main control board, first adsorption tank and second adsorption tank in the host computer shell, one side of host computer shell is provided with control button, second grade zero air interface, heats zero air interface, static pressure pipe interface and dynamic pressure pipe interface.
Preferably, a support frame is installed on one side of the host shell, and the support frame is connected with the diluting device.
Preferably, the staying chamber is provided with a temperature and humidity sensor interface, a pressure sensor, a VOC sampling port and a particulate matter sampling port.
Preferably, the residence chamber is coated with a PTFE coating.
Preferably, the shower nozzle subassembly includes diffusion chamber, nozzle, temperature sensor interface, the dry clean air interface of room temperature, the dry clean air interface of heating, pressure sensor interface, venturi flow tube and vacuum valve quick-operation joint, the electric heating cover is established on the venturi flow tube.
Preferably, the nozzle is provided with a plurality of secondary mixing dilution small holes.
Preferably, the pitot tube comprises a K thermocouple junction, a dynamic pressure tube and a static pressure tube.
Compared with the related art, the portable fixed-source condensable particulate matter and VOCs dilution sampler provided by the invention has the following beneficial effects:
1. compact and small size
The two-stage dilution mixing is compactly arranged together, a miniaturized dilution channel sampler is integrated, and meanwhile, the sample stays indoors for passivation or silanization to collect VOCS; miniaturization is convenient for field installation and test, and portability is improved.
2. Mixing section
Reynolds numbers far greater than 4000 achieve about 12000; real flue gas diffuses to the atmosphere, and the dilution and mixing are finished within 1 second, and the mixing time of the mixing section of the device is less than 1 second.
3. The mixing dilution and the retention chamber are coaxial, the axial flow dilution is adopted, the particle loss can be reduced to the maximum extent, and especially the loss of fine particles due to the non-uniformity of an internal pipeline and structural factors is caused.
4. The dilution ratio can be adjusted by itself in the range of 10-100 or manually.
5. And the sampling time and the sampling flow are set autonomously.
6. The secondary dilution ring can adjust the flow according to actual conditions.
7. The stay chamber is additionally provided with a particle optical particle size measuring sensor, and the particle size distribution condition is real-time or after dilution.
Drawings
FIG. 1 is a schematic diagram of a preferred embodiment of a portable fixed-source condensable particulate matter and VOCs dilution sampler provided by the present invention;
FIG. 2 is a schematic structural diagram of the host shown in FIG. 1;
FIG. 3 is a schematic top view of the mainframe shown in FIG. 1;
FIG. 4 is a schematic view of the dilution unit shown in FIG. 1;
FIG. 5 is a schematic top view of the dilution unit shown in FIG. 1;
FIG. 6 is a schematic structural view of the electric heating jacket shown in FIG. 1;
FIG. 7 is a schematic structural view of the nozzle assembly shown in FIG. 1;
fig. 8 is a schematic structural view of the pitot tube shown in fig. 1.
Reference numbers in the figures: 1. a host, 11, a host shell, 12, an LCD screen, 13, a control panel, 14, a support frame, 15, a temperature control display, 16, an air inlet protective controller, 17, a zero air heating controller, 18, a sampling tank, a 19, 5V switching power supply, a 110, 12V switching power supply, 111, a control button, 112, a secondary zero air interface, 113, a heating zero air interface, 114, a static pressure tube interface, 115, a dynamic pressure tube interface, 116, a sampling flow control valve, 117, a first flow control valve, 118, a second flow control valve, 119, a main control panel, 120, a first adsorption tank, 121, a second adsorption tank, 2, a diluting device, 21, a holding chamber, 2101, a temperature and humidity sensor interface, 2102, a pressure sensor, 2103, a VOC sampling port, 2104, a particulate matter sampling port, 22, a spray head assembly, 2201, a diffusion cavity, 2202, a nozzle, 2203, a temperature sensor interface, 2204, a temperature sensor interface, a temperature sensor interface, a temperature sensor interface, a temperature sensor interface, a temperature sensor, a, Room temperature dry and clean air interface, 2205, heating dry and clean air interface, 2206, pressure sensor interface, 2207, venturi flow tube, 2208, secondary mixing dilution small hole, 2209, vacuum valve quick connector, 3, electric heating jacket, 4, pitot tube, 41, K thermocouple joint, 42, dynamic pressure tube, 43, static pressure tube.
Detailed Description
The invention is further described with reference to the following figures and embodiments.
Referring to fig. 1-8, fig. 1 is a schematic diagram of a preferred embodiment of a portable fixed-source condensable particulate matter and VOCs dilution sampler according to the present invention; FIG. 2 is a schematic structural diagram of the host shown in FIG. 1; FIG. 3 is a schematic top view of the mainframe shown in FIG. 1; FIG. 4 is a schematic view of the dilution unit shown in FIG. 1; FIG. 5 is a schematic top view of the dilution unit shown in FIG. 1; FIG. 6 is a schematic structural view of the electric heating jacket shown in FIG. 1; FIG. 7 is a schematic structural view of the nozzle assembly shown in FIG. 1; fig. 8 is a schematic structural view of the pitot tube shown in fig. 1. Portable fixed source condensable particles and VOCs dilute sample thief includes:
a host 1;
a dilution device 2, wherein the dilution device 2 is installed on the top side of the main machine 1, the dilution device comprises a staying chamber 21 and a spray head assembly 22, and the spray head assembly 22 is installed on one side of the staying chamber 21;
the electric heating sleeve 3 is sleeved on the spray head assembly 22;
a pitot tube 4, said pitot tube 4 being mounted on one side of said dilution means 2.
The host comprises a host shell 11, an LCD screen 12 and a control panel 13 are installed on one side of the host shell 11, a temperature control display 15, an air inlet protective controller 16, a zero air heating controller 17, a sampling tank 18, a 5V switching power supply 19, a 12V switching power supply 110, a 24V switching power supply 122, a sampling flow control valve 116, a first flow control valve 117, a second flow control valve 118, a main control panel 119, a first adsorption tank 120 and a second adsorption tank 121 are installed in the host shell 11, and a control button 111, a secondary zero air interface 112, a heating zero air interface 113, a static pressure pipe interface 114 and a dynamic pressure pipe interface 115 are arranged on one side of the host shell 11.
A support frame 14 is installed on one side of the host shell 11, and the support frame 14 is connected with the dilution device 2.
The staying chamber 21 is provided with a temperature and humidity sensor interface 2101, a pressure sensor 2102, a VOC sampling port 2103 and a particulate matter sampling port 2104.
The residence chamber 21 is internally coated with a PTFE coating.
The spray head assembly 22 comprises a diffusion cavity 2201, a nozzle 2202, a temperature sensor interface 2203, a room temperature dry and clean air interface 2204, a heating dry and clean air interface 2205, a pressure sensor interface 2206, a venturi flow tube 2207 and a vacuum valve quick connector 2209, wherein the venturi flow tube 2207 is sleeved with the electric heating sleeve 3.
The nozzle 2202 is provided with a plurality of secondary mixing dilution small holes 2208.
The pitot tube 4 includes a K thermocouple junction 41, a dynamic pressure tube 42, and a static pressure tube 43.
Compared with the related art, the portable fixed-source condensable particulate matter and VOCs dilution sampler provided by the invention has the following beneficial effects:
1. compact and small size
The two-stage dilution mixing is compactly arranged together, a miniaturized dilution channel sampler is integrated, and meanwhile, the sample stays indoors for passivation or silanization to collect VOCS; miniaturization is convenient for field installation and test, and portability is improved.
2. Mixing section
Reynolds numbers far greater than 4000 achieve about 12000; real flue gas diffuses to the atmosphere, and the dilution and mixing are finished within 1 second, and the mixing time of the mixing section of the device is less than 1 second.
3. The mixing dilution and the retention chamber are coaxial, the axial flow dilution is adopted, the particle loss can be reduced to the maximum extent, and especially the loss of fine particles due to the non-uniformity of an internal pipeline and structural factors is caused.
4. The dilution ratio can be adjusted by itself in the range of 10-100 or manually.
5. And the sampling time and the sampling flow are set autonomously.
6. The secondary dilution ring can adjust the flow according to actual conditions.
7. The stay chamber is additionally provided with a particle optical particle size measuring sensor, and the particle size distribution condition is real-time or after dilution.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A portable fixed-source condensable particulate matter and VOCs dilution sampler, comprising:
a host;
the dilution device is arranged on the top side of the main machine and comprises a staying chamber and a spray head assembly, and the spray head assembly is arranged on one side of the staying chamber;
the electric heating sleeve is sleeved on the spray head assembly;
a pitot tube mounted on a side of the dilution device.
2. The portable fixed-source condensable particulate matter and VOCs dilution sampler of claim 1, wherein the main machine comprises a main machine housing, an LCD screen and a control panel are mounted on one side of the main machine housing, a temperature control display, an air inlet protection controller, a zero air heating controller, a sampling tank, a 5V switching power supply, a 12V switching power supply, a 24V switching power supply, a sampling flow control valve, a first flow control valve, a second flow control valve, a main control panel, a first adsorption tank and a second adsorption tank are mounted in the main machine housing, and a control button, a secondary zero air interface, a heating zero air interface, a static pressure pipe interface and a dynamic pressure pipe interface are arranged on one side of the main machine housing.
3. The portable fixed-source condensable particulate matter and VOCs dilution sampler of claim 2 wherein a support is mounted to one side of the housing of the main body, said support being connected to the dilution unit.
4. The portable fixed-source dilutable particulate matter and VOCs sampler of claim 1 wherein said holding chamber has a temperature and humidity sensor interface, a pressure sensor, a VOC sampling port, and a particulate matter sampling port.
5. The portable fixed-source clottable particulate matter and VOCs dilution sampler of claim 1, wherein said dwell chamber is coated with a PTFE coating.
6. The portable fixed-source condensable particulate matter and VOCs dilution sampler of claim 1, wherein the showerhead assembly comprises a diffusion chamber, a nozzle, a temperature sensor port, a room temperature dry clean air port, a heated dry clean air port, a pressure sensor port, a venturi flow tube and a vacuum valve quick connector, and wherein the electrical heating jacket is fitted over the venturi flow tube.
7. The portable fixed-source dilutable particulate matter and VOCs sampler of claim 6 wherein said nozzle has a plurality of secondary mixing dilution orifices formed therein.
8. The portable fixed-source condensable particulate matter and VOCs dilution sampler of claim 1, wherein the pitot tube comprises a K-thermocouple junction, a dynamic pressure tube and a static pressure tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011085852.7A CN114323815A (en) | 2020-10-12 | 2020-10-12 | Portable fixed source can condense particulate matter and VOCs dilution sample thief |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011085852.7A CN114323815A (en) | 2020-10-12 | 2020-10-12 | Portable fixed source can condense particulate matter and VOCs dilution sample thief |
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| Publication Number | Publication Date |
|---|---|
| CN114323815A true CN114323815A (en) | 2022-04-12 |
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|---|---|---|---|
| CN202011085852.7A Pending CN114323815A (en) | 2020-10-12 | 2020-10-12 | Portable fixed source can condense particulate matter and VOCs dilution sample thief |
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|---|---|---|---|---|
| KR20060094331A (en) * | 2005-02-24 | 2006-08-29 | 한국기계연구원 | Compact mini-tunnel type dilutor system using wall air entrance |
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| CN104677696A (en) * | 2015-02-27 | 2015-06-03 | 北京大学 | Constant-speed sampling gun |
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-
2020
- 2020-10-12 CN CN202011085852.7A patent/CN114323815A/en active Pending
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|---|---|---|---|---|
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| Title |
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