CN212483108U - Pretreatment device of environment air online monitoring system - Google Patents
Pretreatment device of environment air online monitoring system Download PDFInfo
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- CN212483108U CN212483108U CN202020913533.XU CN202020913533U CN212483108U CN 212483108 U CN212483108 U CN 212483108U CN 202020913533 U CN202020913533 U CN 202020913533U CN 212483108 U CN212483108 U CN 212483108U
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- cold trap
- thermal desorption
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Abstract
The utility model discloses an ambient air on-line monitoring system's preprocessing device, including air pump, carrier gas pipeline, two solenoid valves, thermal desorption cold trap and temperature controller, the export of air pump and carrier gas pipeline respectively with two entry linkage of two three way solenoid valves, the export of two three way solenoid valves and thermal desorption cold trap's entry end are connected, thermal desorption cold trap sets up in the temperature controller, the exit linkage of thermal desorption cold trap has the sample outlet pipeline, the sample outlet pipeline extends to the temperature controller outside. The utility model discloses can be concentrated to the pollutant in the air to make the pollutant concentration in the air satisfy the requirement that chromatographic analyzer detected the limit.
Description
Technical Field
The utility model belongs to the technical field of measurement technical mechanism and environmental protection monitored control system, relate to VOCs (volatile organic compounds) on-line monitoring instrument sampling device among the ambient air, specifically are an ambient air on-line monitoring system's preprocessing device.
Background
Volatile Organic Compounds (VOCs) are volatile organic compounds at normal temperature and normal pressure, mainly comprise alkanes, alkenes, aromatic hydrocarbons and other hydrocarbons containing oxides, halogenated hydrocarbons, nitrogen and sulfur, and the like, and have certain potential hazards. Under certain conditions, the ozone can generate photochemical reaction with nitrogen oxide to generate ozoneThe photochemical smog is formed, and the photochemical smog can also react with some free radicals to form secondary organic aerosol, thereby causing great harm to human bodies and environment. In recent years, the ministry of environmental protection has paid more and more attention to monitoring and treatment of VOCs emission, and a considerable part of regulatory requirements for VOCs monitoring and treatment are made. There is also an increasing demand for real-time monitoring of VOCs in ambient air, where the concentration of pollutants is generally low (10 f)-9～10-6Magnitude order), the direct sampling method often can not satisfy the requirement of chromatographic analyzer detection limit, need adopt the enrichment sampling method to carry out monitoring analysis after the pollutant in the air is concentrated.
Disclosure of Invention
For solving the problem that exists among the prior art, the utility model aims at providing an ambient air on-line monitoring system's preprocessing device, the utility model discloses can be concentrated to the pollutant in the air.
The utility model adopts the technical scheme as follows:
the utility model provides an ambient air on-line monitoring system's preprocessing device, includes air pump, carrier gas pipeline, two three way solenoid valves, thermal desorption cold trap and temperature controller, the export of air pump and carrier gas pipeline respectively with two entry linkage of two three way solenoid valves, the export of two three way solenoid valves and thermal desorption cold trap's entry end are connected, thermal desorption cold trap sets up in the temperature controller, the exit linkage of thermal desorption cold trap has sample outlet pipeline, sample outlet pipeline extends to the temperature controller outside.
Preferably, a filter is arranged on a pipeline of the air pump inlet.
Preferably, the utility model discloses a preprocessing device still includes the bypass pipeline, is equipped with two solenoid valve, needle valve and manometer from entry to export in proper order on the bypass pipeline, and the export of pipeline is connected with thermal desorption/cold trap's entry end.
Preferably, the pressure gauge is connected to the bypass pipeline through a tee joint.
Preferably, the inlet end of the thermal desorption/cold trap is provided with a flow stabilizing valve.
The utility model discloses following beneficial effect has:
the utility model discloses an ambient air on-line monitoring system's preprocessing device utilizes the temperature controller to control the temperature of thermal desorption cold trap, the thermal desorption cold trap can carry out the enrichment sampling to the ambient air sample when being in the low temperature state, the thermal desorption cold trap can carry out the desorption to the ambient air sample when being in the high temperature state, the carrier gas pipeline can let in gas (like nitrogen gas) and take out the gas after the enrichment desorption again from the sample outlet pipeline behind thermal desorption cold trap and the ambient air sample desorption for monitoring, analysis. The utility model discloses can be concentrated to the pollutant in the air to make the pollutant concentration in the air satisfy the requirement that chromatographic analyzer detected the limit.
Further, through setting up the bypass pipeline to be equipped with two-way solenoid valve, needle valve and manometer in proper order from the entry to the export on the bypass pipeline, the bypass pipeline can extract the surplus air of volume with the air pump and discharge, and can adjust the flow of bypass pipeline through the needle valve, utilize the manometer can real-time detection bypass pipeline in gaseous pressure.
Furthermore, the arrangement of the flow stabilizing valve can ensure that the gas pressure and the gas flow entering the thermal desorption/cold trap are stable, ensure the enrichment effect of the thermal desorption/cold trap on the ambient air sample and ensure the accuracy of the detection result.
Drawings
Fig. 1 is a schematic structural diagram of the pretreatment device of the online ambient air monitoring system of the present invention.
In the figure: an A1 two-way electromagnetic valve, an A2 two-position three-way electromagnetic valve, an A3 needle valve, an A4 three-way valve, a B1 pressure gauge, a B2 filter, a B3 air pump, a B4 flow stabilizing valve, a B5 thermal desorption \ cold trap, a B6 temperature controller, a G1 bypass pipeline, a G2 ambient air sampling pipeline, a G3 gas carrying pipeline, a G4 flow stabilizing valve inlet pipeline, a G5 thermal desorption \ cold trap inlet pipeline and a G6 sample outlet pipeline.
Detailed Description
The invention is further described with reference to the accompanying drawings and examples.
Referring to fig. 1, the utility model discloses ambient air on-line monitoring system's preprocessing device, including air pump B3, carrier gas pipeline G3, two-position three way solenoid valve A2, thermal desorption \ cold trap B5 and temperature controller B6, air pump B3's export and carrier gas pipeline G3's export respectively with two entry linkage of two-position three way solenoid valve A2, two-position three way solenoid valve A2's export and thermal desorption \ cold trap B5's entry end are connected, thermal desorption \ cold trap B5 sets up in temperature controller B6, thermal desorption \ cold trap B5's exit linkage has sample outlet pipeline G6, sample outlet pipeline G6 extends to temperature controller B6 outside.
As a preferred embodiment of the utility model, a filter B2 is arranged on the pipeline of the inlet of the air pump B3.
As the utility model discloses preferred embodiment, the utility model discloses a preprocessing device still includes bypass pipeline G1, is equipped with two-way solenoid valve A1, needle valve A3 and manometer B1 from the entry to the export in proper order on the bypass pipeline G1, and the export of siphunculus G1 is connected with thermal desorption/cold trap B5's entry end.
As a preferred embodiment of the present invention, the pressure gauge B1 is connected to the bypass line G1 through a tee joint a 4.
As the preferred embodiment of the present invention, the inlet end of the thermal desorption/cold trap B5 is provided with a flow stabilizing valve B4, and the outlet of the two-position three-way solenoid valve a2 is connected with the flow stabilizing valve B4.
Examples
In the pretreatment device of the ambient air online monitoring system in this embodiment, a filter B2 is arranged on a pipeline at an inlet of an air pump B3, an inlet end of a thermal desorption/cold trap B5 is provided with a flow stabilizing valve B4, an outlet of the air pump B3 and an outlet of a gas carrying pipeline G3 are respectively connected with two inlets of a two-position three-way solenoid valve a2, an outlet of the two-position three-way solenoid valve a2 is connected with a three-way valve a4, an inlet of a bypass pipeline G1, an outlet of the two-position three-way solenoid valve a2 and an inlet of the flow stabilizing valve B4 are connected through a three-way valve a4, an outlet of the flow stabilizing valve B4 is connected with an inlet end of the thermal desorption/cold trap B5, the thermal desorption/cold trap B5 is arranged in a temperature controller B6, an outlet of the thermal desorption/cold trap B5 is connected with a sample outlet. The bypass pipeline G1 is provided with a two-way electromagnetic valve A1, a needle valve A3 and a pressure gauge B1 from the inlet to the outlet in sequence, and the pressure gauge B1 is connected to the bypass pipeline G1 through another three-way valve A4.
Each component module and the implementation mode in this embodiment are introduced as follows:
bypass line G1: the excess air pumped by the air pump B3 flows into the bypass line G1, passes through the needle valve A3, passes through the two-way solenoid valve a1, and is discharged. The needle valve A3 is used for regulating the flow of G1 pipeline, and the pressure gauge B1 is used for indicating the pressure in G1 pipeline.
Ambient air sampling line G2: ambient air is pumped by the air pump B3, filtered by the filter B2, flows into the flow stabilizing valve inlet pipeline G4 at the outlet of the two-position three-way electromagnetic valve A2 and enters the flow stabilizing valve B4. The surplus air pumped by the air pump B3 flows into the three-way valve A4 and flows out through the bypass pipeline G1.
Carrier gas line G3: the two-position three-way electromagnetic valve A2 is electrified and switched, and carrier gas passes through the two-position three-way electromagnetic valve A2 from the carrier gas pipeline G3 and enters the flow stabilizing valve B4 through the flow stabilizing valve inlet pipeline G4.
Thermal desorption/cold trap B5: air with a constant flow rate of a flow stabilizing valve B4 enters a thermal desorption/cold trap B5 through a G5 pipeline, a temperature controller B6 controls the temperature of the thermal desorption/cold trap B5, the thermal desorption/cold trap B5 is used for enrichment sampling at a low temperature, and a sample is desorbed at a high temperature.
The working process of the pretreatment device of the embodiment comprises the following steps:
1. enrichment sampling process
The two-way electromagnetic valve A1 is in an open state, an ambient air sampling pipeline G2 connected to the two-position three-way electromagnetic valve A2 is communicated with an inlet pipeline G4 of the flow stabilizing valve, and the air pump B3 works to pump ambient air. The sample pressure is regulated by needle valve a3, pressure gauge B1 indicates sample line pressure, and excess gas is vented through bypass line G1.
After being pumped by an air pump B3 through a pipeline G2, ambient air is filtered by a filter B2, passes through an ambient air sampling pipeline G2, passes through a flow stabilizing valve inlet pipeline G4, enters a flow stabilizing valve B4, passes through a thermal desorption \ cold trap inlet pipeline G5 and passes through a thermal desorption \ cold trap B5 at a constant flow rate, and at the moment, a temperature controller B6 controls a thermal desorption \ cold trap B5 to be in a low-temperature state to perform enrichment sampling on an ambient air sample.
2. Desorption process
After the enrichment sampling is finished, the air pump B3 is closed, the two-way electromagnetic valve A1 is closed, the thermal desorption \ cold trap B5 is rapidly heated to 180 ℃ and kept for 2 minutes, at the moment, the two-position three-way electromagnetic valve A2 is switched, and carrier gas (the pressure of bottled nitrogen is kept the same as the sampling pressure) passes through the flow valve inlet pipeline G4 from the gas carrier pipeline G3, passes through the flow stabilizing valve B4, passes through the thermal desorption \ cold trap inlet pipeline G5 at a constant flow rate, and passes through the thermal desorption \ cold trap B5 to take out the enriched sample.
The ratio of the enrichment sampling time to the desorption outflow time is the sample concentration ratio, the concentration ratio of air sampling can be adjusted and controlled according to the principle, and the desorbed sample is brought into a chromatograph for analysis through automatic purging of carrier gas.
The device skillfully utilizes the function of constant flow rate of the flow stabilizing valve, controls the enrichment (concentration) ratio through sample introduction time, and adopts the principle of thermal desorption/cold trap device cold adsorption thermal desorption to realize the function of automatic sample introduction after the concentration and sampling of the air sample.
The quantitative sampling mode of the enrichment (concentration) ratio can be effectively controlled, and the functional requirements of gas on-line monitoring and analyzing instrument sampling and sample gas pretreatment can be met.
The terms and abbreviations of the present invention are explained as follows:
VOCs: volatile organic compounds.
Thermal desorption: volatiles are released from the adsorbent or the sample itself upon heating.
Cold trap: cold trap processing is a cooling device used to collect materials in a certain boiling point range.
An enrichment sampling method: also known as "concentration sampling method", a gas sampling method in which a component to be measured in an air sample is concentrated while being sampled.
Claims (5)
1. The utility model provides an ambient air on-line monitoring system's preprocessing device, a serial communication port, including air pump (B3), carrier gas pipeline (G3), two-bit three way solenoid valve (A2), thermal desorption \ cold trap (B5) and temperature controller (B6), the export of air pump (B3) and the export of carrier gas pipeline (G3) are connected with two entrances of two-bit three way solenoid valve (A2) respectively, the export of two-bit three way solenoid valve (A2) is connected with the entry end of thermal desorption \ cold trap (B5), thermal desorption \ cold trap (B5) set up in temperature controller (B6), the exit linkage of thermal desorption cold trap (B5) has sample outlet pipeline (G6), sample outlet pipeline (G6) extends to temperature controller (B6) outside.
2. The pretreatment device of an on-line ambient air monitoring system according to claim 1, wherein a filter (B2) is disposed on the pipeline of the inlet of the air pump (B3).
3. The pretreatment device of the ambient air on-line monitoring system according to claim 1, further comprising a bypass pipeline (G1), wherein the bypass pipeline (G1) is sequentially provided with a two-way solenoid valve (A1), a needle valve (A3) and a pressure gauge (B1) from an inlet to an outlet, and the outlet of the bypass pipeline (G1) is connected with the inlet end of the thermal desorption/cold trap (B5).
4. The pretreatment device of an on-line environmental air monitoring system according to claim 3, wherein the pressure gauge (B1) is connected to the bypass line (G1) through a tee joint (A4).
5. The pretreatment device of the on-line ambient air monitoring system according to any one of claims 1 to 4, wherein the inlet end of the thermal desorption/cold trap (B5) is provided with a flow stabilizing valve (B4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020913533.XU CN212483108U (en) | 2020-05-26 | 2020-05-26 | Pretreatment device of environment air online monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020913533.XU CN212483108U (en) | 2020-05-26 | 2020-05-26 | Pretreatment device of environment air online monitoring system |
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| Publication Number | Publication Date |
|---|---|
| CN212483108U true CN212483108U (en) | 2021-02-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020913533.XU Active CN212483108U (en) | 2020-05-26 | 2020-05-26 | Pretreatment device of environment air online monitoring system |
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| CN (1) | CN212483108U (en) |
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2020
- 2020-05-26 CN CN202020913533.XU patent/CN212483108U/en active Active
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Denomination of utility model: A Pretreatment Device for Ambient Air Online Monitoring System Effective date of registration: 20221220 Granted publication date: 20210205 Pledgee: Pudong Development Bank of Shanghai Limited by Share Ltd. Xi'an branch Pledgor: XI'AN DINGYAN TECHNOLOGY CO.,LTD. Registration number: Y2022610000815 |