CN211235198U - Water removal and enrichment device for volatile organic compounds in ambient air - Google Patents
Water removal and enrichment device for volatile organic compounds in ambient air Download PDFInfo
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- CN211235198U CN211235198U CN201922287050.3U CN201922287050U CN211235198U CN 211235198 U CN211235198 U CN 211235198U CN 201922287050 U CN201922287050 U CN 201922287050U CN 211235198 U CN211235198 U CN 211235198U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 239000012080 ambient air Substances 0.000 title claims abstract description 40
- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 32
- 239000007789 gas Substances 0.000 claims abstract description 84
- 239000003570 air Substances 0.000 claims abstract description 42
- 239000001307 helium Substances 0.000 claims abstract description 22
- 229910052734 helium Inorganic materials 0.000 claims abstract description 22
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims abstract description 22
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 9
- 238000003795 desorption Methods 0.000 claims description 18
- 238000007664 blowing Methods 0.000 claims description 11
- 230000007613 environmental effect Effects 0.000 claims description 11
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 description 36
- 239000000126 substance Substances 0.000 description 6
- 238000010926 purge Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000007781 pre-processing Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model discloses an ambient air volatile organic compounds dewatering enrichment device, include: the multi-position valve comprises a plurality of ports and a common port, one port of the plurality of ports is connected with nitrogen/zero-order air, one port of the plurality of ports is connected with an ambient air sample, one port of the plurality of ports is connected with internal standard gas, and the other port of the plurality of ports is connected with external standard gas; the common port of the multi-position valve is connected with the water removal trap, and the water removal trap is used for removing water from the gas entering the water removal trap; the enrichment trap is connected with the water removal trap and is used for enriching volatile organic compounds contained in the gas entering the enrichment trap; the detector is used for sending the volatile organic compounds enriched in the enrichment trap to the detector through helium for detection; the air pump is used for providing airflow power for the air entering the dewatering trap and the enrichment trap; and the six-way valve is used for establishing connection among the water removal trap, the enrichment trap, the helium gas, the air pump and the detector. The utility model discloses control portably, can improve the accuracy of enrichment.
Description
Technical Field
The utility model relates to an ambient air volatile organic compounds detects technical field, especially relates to a simple structure, control are simple and convenient, can improve accuracy and representative ambient air volatile organic compounds dewatering enrichment device.
Background
With the development of economy, people's living standard is improved, and more pay more attention to quality of life, and environmental air is the important factor that influences quality of life.
In recent years, air pollution has seriously affected air quality, and has important influence on human living environment and physical health. Volatile organic compounds in the ambient air are an important index influencing the quality of the ambient air. When the concentration of the volatile organic compounds in the air is higher, the concentration level is ppm and ppb level, the existing technology can directly measure, however, when the concentration of the volatile organic compounds in the air is lower, the concentration level is below ppt level, and the sample needs to be enriched. The existing device for enriching the sample has the disadvantages of complex equipment structure and complex control, and the resistance of the sample flowing through the valve and the pipeline is large.
Therefore, there is a need for a device for removing and enriching volatile organic compounds from ambient air, which has a simple structure and is easy to control, and can improve accuracy and representativeness.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a simple structure, control are simple and convenient, can improve accuracy and representative ambient air volatile organic compounds dewatering enrichment method and device.
In order to realize the purpose, the utility model provides a technical scheme does: the method for removing and enriching the water of the volatile organic compounds in the ambient air comprises the following steps:
(1) an ambient air sample enrichment process, wherein the ambient air sample is dewatered by a dewatering trap, and volatile organic compounds are enriched by an enrichment trap;
(2) and (3) dry blowing flow: purging the enrichment trap through helium, and purging and removing water and oxygen existing in the enrichment trap;
(3) desorption, desorption and sample injection flow: heating the water removal trap and the enrichment trap, and purging the water removal trap through nitrogen or zero-level air to remove ice condensed by the water removal trap; simultaneously desorbing the substances adsorbed by the enrichment trap, and sending helium gas into a detector for detection;
(4) a reset preparation process: and cooling the water removal trap and the enrichment trap to a set temperature, and waiting for the sampling triggering to return to the ambient air sample enrichment process.
In the process of the enrichment of the environmental air sample, the temperature of the water removal trap is-50 to-30 ℃, the temperature of the enrichment trap is-30 ℃, in the process of the enrichment of the environmental air sample, the total mass of the sucked environmental air sample is controlled by a mass flow controller, and the suction time of the sucked environmental air sample is 25 to 60 minutes.
In the desorption, desorption and sample injection process, the temperature of the water removal trap is raised to 150 ℃, the temperature of the enrichment trap is raised to 300 ℃, substances adsorbed by the enrichment trap are desorbed, helium is fed into the detector for detection, a starting signal is sent to the detector, the detector starts timing, and the time lasts for 3-10 minutes.
In order to achieve the above object, the utility model discloses still provide technical scheme be: the utility model provides an environmental air volatile organic compounds removes water enrichment device, includes:
a multi-position valve comprising a plurality of ports and a common port, wherein one port of the plurality of ports is connected with nitrogen/zero-order air, one port is connected with an ambient air sample, one port is connected with an internal standard gas, and one port is connected with an external standard gas;
the common port of the multi-position valve is connected with the water removal trap, and the water removal trap is used for removing water from the gas entering the water removal trap;
the enrichment trap is connected with the water removal trap and is used for enriching volatile organic compounds contained in the gas entering the enrichment trap;
the detector is used for sending the volatile organic compounds enriched in the enrichment trap to the detector through helium for detection;
the air pump is used for providing airflow power for the air entering the water removal trap and the enrichment trap;
and the six-way valve is used for establishing connection among the water removal trap, the enrichment trap, the helium gas, the air pump and the detector.
The total mass of gas entering the water removal trap and/or enrichment trap is controlled by a mass flow controller.
When the environment air sample is enriched or the internal standard gas or the external standard gas is added, the environment air sample or the internal standard gas or the external standard gas is respectively connected to each port of the multi-position valve to enter and is connected to the dewatering trap from the common port, the outlet of the dewatering trap is connected to the first port and the sixth port of the six-way valve to enter the enrichment trap, and is connected to the third port and the second port of the six-way valve from the outlet of the enrichment trap and is connected to the air pump.
On dry blowing, helium gas is connected to the fourth port, the third port of the six-way valve into the enrichment trap, and from the outlet of the enrichment trap to the sixth port, the fifth port of the six-way valve, and to the detector.
When desorption, desorption and sample injection are carried out, nitrogen/zero-level air is connected to one port of the multi-position valve to enter and is connected to the water removal trap from the common port, and an outlet of the water removal trap is connected to the first port and the second port of the six-way valve and is discharged through a three-way valve; while helium is connected to the fourth port, the third port of the six-way valve and into the enrichment trap, and from the outlet of the enrichment trap to the sixth port, the fifth port of the six-way valve and to the detector.
Compared with the prior art, the method and the device for removing and enriching the water of the volatile organic compounds in the ambient air have the following beneficial effects:
1. the utility model relates to a collect dewatering, enrichment, desorption advance kind, calibration gas preprocessing device of demarcation.
2. The utility model discloses a mass flow controller comes accurate measurement and controls gaseous quality and flow.
3. The utility model discloses a six-way valve and many valve realize the switching of gas circuit, reduce the volume blind spot.
4. The utility model discloses an enrichment flow path pipeline does not have leading valve member when gathering the ambient air sample, does not pass through the valve switch that probably produces the organic release of volatility.
5. The utility model discloses a low temperature cold-trap is through going dewatering and enrichment, and low temperature helps vapor condensation and adsorbent to adsorb.
6. The utility model discloses an integrated design, the modular integration of functional structure, the sampling gas is through removing water trap-enrichment trap-mass flow controller in proper order in gaseous preprocessing device to through the enrichment flow, dry blowing flow, desorption flow, prepare the flow and accomplish the volatile organic compounds to the ambient air sample in carry out the dewatering, deoxidization, enrichment, the analytic processing of advancing kind.
The invention will become more apparent from the following description when taken in conjunction with the accompanying drawings which illustrate embodiments of the invention.
Drawings
Fig. 1 is a schematic flow diagram of the process of enriching the environmental air sample according to the present invention.
FIG. 2 is a schematic flow diagram of an internal standard gas enrichment process.
FIG. 3 is a schematic flow diagram of an external standard gas enrichment process.
Fig. 4 is a schematic flow path diagram of a dry blowing process or a desorption/desorption sample injection process.
Fig. 5 is a flow chart showing reset preparation.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.
The embodiment of the utility model provides a technical scheme does: the method for removing and enriching the water of the volatile organic compounds in the ambient air comprises the following steps:
referring to fig. 1, fig. 1 shows an ambient air sample enrichment process, wherein an ambient air sample is dehydrated by a water removal trap 10 and is enriched in volatile organic compounds by an enrichment trap 20;
in the ambient air sample enrichment process shown in fig. 1, the port 1 of the multi-position valve T4 is connected to an ambient air sample, the temperature of the water removal trap 10 is-50 to-30 ℃, the temperature of the enrichment trap 20 is-30 ℃, and in the ambient air sample enrichment process, the total mass of the sucked ambient air sample is controlled by the mass flow controller 30, and the suction time of the sucked ambient air sample is 25 to 60 minutes. And the power of the drawn-in ambient air sample is provided by the air pump 40.
It should be noted that in the ambient air sample enrichment process, the outlets of the water trap 10 are connected to the first port a and the sixth port f of the six-way valve T5 to enter the enrichment trap 20, and are connected to the third port c and the second port b of the six-way valve T5 from the outlet of the enrichment trap 20 and are connected to the air pump 40.
Thus, an ambient air sample enters from port 1 of the multi-position valve T4, enters the dewatering trap 10 from the common port of the multi-position valve T4, and enters the enrichment trap 20 from the first port a and the sixth port f of the six-way valve T5, and the outlet of the enrichment trap 20 is connected to the third port c and the second port b of the six-way valve T5 and to the air pump 40. The water vapor in the environmental air sample is cooled to remove water thoroughly at the temperature of-50 to-30 ℃ of the water removing trap 10, and the volatile organic compounds in the environmental air sample are enriched in the enrichment trap 20.
Referring to fig. 2, fig. 2 shows a flow chart of calibration by an internal standard gas. The utility model discloses can also calibrate interior label gas, and before interior label gas calibrates, at first be interior label gas and add the flow: in the embodiment shown in fig. 2, the internal standard gas is dehydrated by the water removal trap 10, and the volatile organic compounds are enriched by the enrichment trap 20;
in the internal standard gas adding process shown in fig. 2, an internal standard gas is connected to a port 2 of the multi-position valve T4, wherein an electromagnetic valve T1 is used for controlling the connection and disconnection between the internal standard gas and the multi-position valve T4, the temperature of the water removal trap 10 is-50 to-30 ℃, the temperature of the enrichment trap 20 is-30 ℃, in the internal standard gas enrichment process, the total mass of the inhaled internal standard gas is controlled by a mass flow controller 30, and the inhalation time of the internal standard gas is 0.5 to 2 minutes. While the motive force for the inhaled ring internal standard gas is provided by the gas pump 40.
It should be noted that in the internal standard gas enrichment process, the outlet of the water removal trap 10 is connected to the first port a and the sixth port f of the six-way valve T5 to enter the enrichment trap 20, and is connected to the third port c and the second port b of the six-way valve T5 from the outlet of the enrichment trap 20 and is connected to the gas pump 40.
The utility model discloses can also calibrate interior label gas, and before interior label gas calibrates, at first be interior label gas and add the flow: fig. 2 shows an internal standard gas adding process, in which the internal standard gas is dehydrated by a water removal trap 10, and the volatile organic compounds are enriched by an enrichment trap 20;
similarly, referring to fig. 3, fig. 3 shows a calibration process with an external standard gas, and before the calibration of the external standard gas, the external standard gas adding process is performed: FIG. 3 shows an external standard gas adding process, in which the external standard gas is dehydrated by the water removing trap 10 and the volatile organic compounds are enriched by the enrichment trap 20; the electromagnetic valve T2 is used for controlling the on-off between external standard gas and the multi-position valve T4, the temperature of the water removal trap 10 is-50 to-30 ℃, the temperature of the enrichment trap 20 is-30 ℃, in the external standard gas enrichment process, the total mass of the sucked external standard gas is controlled by the mass flow controller 30, and the suction time of the external standard gas is 20 to 60 minutes. While the motive force for the inhaled ring internal standard gas is provided by the gas pump 40.
It should be noted that in the external standard gas enrichment flow, the outlet of the water trap 10 is connected to the first port a and the sixth port f of the six-way valve T5 to enter the enrichment trap 20, and is connected to the third port c and the second port b of the six-way valve T5 from the outlet of the enrichment trap 20 and is connected to the gas pump 40.
Referring to fig. 4, dry blow flow: purging the enrichment trap 20 with helium to purge water and oxygen present in the enrichment trap 20;
in the dry blowing process, helium is connected to the fourth port d and the third port c of the six-way valve T5 to enter the enrichment trap 20, and is connected from the outlet of the enrichment trap 20 to the sixth port f and the fifth port e of the six-way valve T5 and is connected to the detector 50, so that the gas flow path can be easily adjusted through the six-way valve T5, and the control is convenient.
In the dry blowing process, the temperature of the dewatering trap 10 is maintained at-50 to-30 ℃, and the temperature of the enrichment trap 20 is maintained at-30 ℃.
Referring to fig. 4, the flow path of desorption/desorption sample injection process is the same as that of dry blowing process: heating the water removal trap 10 and the enrichment trap 20, wherein the water removal trap 10 is purged by nitrogen or zero-level air to remove ice condensed by the water removal trap 10; simultaneously, the substances adsorbed by the enrichment trap 20 are desorbed and sent to a detector 50 for detection by helium;
in the desorption, desorption and sample injection process, although the flow path is the same as that of the dry blowing process, the temperature setting of the water removal trap 10 is different from that of the enrichment trap 20, in the process, the temperature of the water removal trap 10 is raised to 150 ℃, the temperature of the enrichment trap 20 is raised to 300 ℃, the substances adsorbed by the enrichment trap 20 are desorbed, helium is sent to the detector 50 for detection, a start signal is sent to the detector 50, the detector 50 starts timing, and the time lasts for 3-10 minutes.
(6) A reset preparation process: and cooling the water removal trap 10 and the enrichment trap 20 to a set temperature, and waiting for the sampling triggering to return to the ambient air sample enrichment process. When the preparation process is reset, the temperature of the dewatering trap 10 is-50 to-30 ℃, and the temperature of the enrichment trap 20 is-30 ℃.
Referring to fig. 1 to 5, in order to achieve the above object, the present invention further provides a technical solution: the utility model provides an environmental air volatile organic compounds removes water enrichment device, includes:
a multi-position valve T4, and the multi-position valve T4 includes a plurality of ports, one common port, referring to fig. 1, disposed at the center of the multi-position valve T4, and the other ports disposed at the periphery of the multi-position valve T4, one of the plurality of ports being connected to nitrogen/zero-level air, one port being connected to an ambient air sample, one port being connected to an internal standard gas, and one port being connected to an external standard gas;
the common port of the multi-position valve T4 is connected with the dewatering trap 10, the dewatering trap 10 is used for dewatering the gas entering the dewatering trap 10, and the dewatering trap 10 is used for dewatering the moisture contained in the ambient air sample, the internal standard gas and the external standard gas;
the enrichment trap 20, the enrichment trap 20 is connected with the water removal trap 10, the enrichment trap 20 is used for enriching volatile organic compounds contained in the gas entering the enrichment trap 20, and the enrichment trap 20 is used for enriching volatile organic compounds contained in an ambient air sample, an internal standard gas and an external standard gas;
the detector 50 is used for sending the volatile organic compounds enriched in the enrichment trap 20 to the detector 50 through helium for detection;
the air pump 40 is used for providing airflow power for the air entering the dewatering trap 10 and the enrichment trap 20;
and the six-way valve T5 is used for establishing connection among the water removal trap 10, the enrichment trap 20, the helium gas, the air pump 40 and the detector 50.
In one embodiment, the total mass of gas entering the water trap 10 and/or the enrichment trap 20 is controlled by a mass flow controller 30.
When the ambient air sample is enriched or the internal standard gas or the external standard gas is added, the ambient air sample or the internal standard gas or the external standard gas is respectively connected to each port of the multi-position valve T4 to enter and is connected to the water removal trap 10 from the common port, the outlet of the water removal trap 10 is connected to the first port a and the sixth port f of the six-way valve T5 to enter the enrichment trap 20, and is connected to the third port c and the second port b of the six-way valve T5 from the outlet of the enrichment trap 20 to be connected to the gas pump 40.
When dry blowing is required to be performed on the enrichment trap 20, helium gas is connected to the fourth port d and the third port c of the six-way valve T5 to enter the enrichment trap 20, and is connected from the outlet of the enrichment trap 20 to the sixth port f and the fifth port e of the six-way valve T5 and is connected to the detector 50, so that the gas flow path can be easily adjusted through the six-way valve T5, and control is facilitated. While dry blowing the enrichment trap 20, the temperature of the enrichment trap 20 was maintained at-30 ℃.
Referring to fig. 5, desorption and sample injection process: heating the water removal trap 10 and the enrichment trap 20, wherein the water removal trap 10 is purged by nitrogen or zero-level air to remove ice condensed by the water removal trap 10; simultaneously, the substances adsorbed by the enrichment trap 20 are desorbed and sent to a detector 50 for detection by helium;
in the desorption, desorption and sample injection process, the temperature of the water removal trap 10 is raised to 150 ℃, the temperature of the enrichment trap 20 is raised to 300 ℃, substances adsorbed by the enrichment trap 20 are desorbed, helium is fed into the detector 50 for detection, a starting signal is sent to the detector 50, the detector 50 starts timing, and the time lasts for 3-10 minutes.
The functional modules in the embodiments of the present invention can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. The utility model provides an environmental air volatile organic compounds removes water enrichment device which characterized in that includes:
a multi-position valve comprising a plurality of ports and a common port, wherein one port of the plurality of ports is connected with nitrogen/zero-order air, one port is connected with an ambient air sample, one port is connected with an internal standard gas, and one port is connected with an external standard gas;
the common port of the multi-position valve is connected with the water removal trap, and the water removal trap is used for removing water from the gas entering the water removal trap;
the enrichment trap is connected with the water removal trap and is used for enriching volatile organic compounds contained in the gas entering the enrichment trap;
the detector is used for sending the volatile organic compounds enriched in the enrichment trap to the detector through helium for detection;
the air pump is used for providing airflow power for the air entering the water removal trap and the enrichment trap;
and the six-way valve is used for establishing connection among the water removal trap, the enrichment trap, the helium gas, the air pump and the detector.
2. The ambient air voc water removal enrichment device of claim 1, wherein the total mass of gas entering the water removal trap and/or the enrichment trap is controlled by a mass flow controller.
3. The apparatus as claimed in claim 1, wherein when the ambient air sample is enriched or the internal standard gas or the external standard gas is added, the ambient air sample or the internal standard gas or the external standard gas is respectively connected to each port of the multi-position valve to enter and is connected to the dewatering trap from the common port, the outlet of the dewatering trap is connected to the first port and the sixth port of the six-way valve to enter the enrichment trap, and is connected to the third port and the second port of the six-way valve from the outlet of the enrichment trap to be connected to the air pump.
4. The ambient air voc water removal enrichment device of claim 1, wherein upon dry blowing, helium gas is connected to the fourth port, the third port of the six-way valve into the enrichment trap, and from the outlet of the enrichment trap to the sixth port, the fifth port of the six-way valve and to the detector.
5. The apparatus as claimed in claim 1, wherein when desorption/injection is performed, nitrogen/zero-level air is connected to a port of the multi-position valve and enters the apparatus from the common port to the trap, and an outlet of the trap is connected to the first port and the second port of the six-way valve and is discharged through a three-way valve; while helium is connected to the fourth port, the third port of the six-way valve and into the enrichment trap, and from the outlet of the enrichment trap to the sixth port, the fifth port of the six-way valve and to the detector.
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| CN201922287050.3U CN211235198U (en) | 2019-12-18 | 2019-12-18 | Water removal and enrichment device for volatile organic compounds in ambient air |
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| CN201922287050.3U CN211235198U (en) | 2019-12-18 | 2019-12-18 | Water removal and enrichment device for volatile organic compounds in ambient air |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111060386A (en) * | 2019-12-18 | 2020-04-24 | 江苏国技仪器有限公司 | Method and device for removing and enriching water of volatile organic compounds in ambient air |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111060386A (en) * | 2019-12-18 | 2020-04-24 | 江苏国技仪器有限公司 | Method and device for removing and enriching water of volatile organic compounds in ambient air |
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Effective date of registration: 20231102 Address after: Room 599 Yuanchuang Road, Huaqiao Town, Kunshan City, Suzhou City, Jiangsu Province, 215332 Patentee after: Jiangsu Suli Environmental Instrument Co.,Ltd. Address before: 215332 second floor, building B7 and 8, No.15 Jinyang Road, Huaqiao Town, Kunshan City, Suzhou City, Jiangsu Province Patentee before: Jiangsu National Technology Instrument Co.,Ltd. |
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