CN214472958U

CN214472958U - Volatile organic compound detection and quality control device

Info

Publication number: CN214472958U
Application number: CN202120147811.XU
Authority: CN
Inventors: 曾立武; 黄晓锋; 冯凝; 何凌燕
Original assignee: Peking University Shenzhen Graduate School
Current assignee: Peking University Shenzhen Graduate School
Priority date: 2021-01-20
Filing date: 2021-01-20
Publication date: 2021-10-22
Anticipated expiration: 2031-01-20

Abstract

The utility model provides a volatile organic compounds detects matter accuse device, the device includes outdoor gas tetrafluoro filter, indoor outer appearance electromagnetism diverter valve of advancing. The utility model realizes the detection and quality control operation of volatile organic compounds by periodically switching sample gas, zero gas and standard gas channels; the heat preservation temperature of the sampling pipeline is regulated at any time by monitoring the environmental temperature in real time, the temperature of the measured outdoor gas is ensured to be consistent with that of the detected environment, the water vapor condensation caused by too high dew point is avoided, and the condition that the detection data is inaccurate due to the retention loss of formaldehyde formic acid and the like with high viscosity in the detected volatile organic compounds in the pipeline is reduced; the sampling environment condition is judged in real time, and indoor and outdoor sampling channels are switched in time, so that invalid sampling and sampling hidden danger can be avoided; meanwhile, the variable adjustment of the drainage flow is more suitable for the application in different fields; the pressure of the sampling pipeline is monitored more effectively, the sampling channel is ensured to be smooth, and the quality control requirement is met.

Description

Volatile organic compound detection and quality control device

Technical Field

The utility model belongs to the technical field of volatile organic compounds detection device, concretely relates to volatile organic compounds detects matter accuse device.

Background

High Sensitivity Proton Transfer Reaction Mass Spectrometry (PTR-MS) is a rapid and novel technology for online detection of Volatile Organic Compounds (VOCs), and commercial instruments are put into use at the end of the last 90 th century and are commonly used for online measurement of VOCs in ambient atmosphere. The device continuously and stably extracts gas with fixed flow rate from the atmosphere, and mainly utilizes VOC species, water and hydrogen ions (H3O) after entering the instrument⁺) Followed by the use of a mass spectrometry system to generate protonated VOC ions (RH)⁺) A rapid quantitative measurement was performed.

VOCs generally refer to organic compounds that have a relatively high saturated vapor pressure, a relatively low boiling point, a relatively small molecular mass, and are volatile at room temperature. It plays a key role in the secondary generation of tropospheric ozone and PM 2.5. In the prior art, a mass spectrometer for detecting volatile organic compounds only analyzes sample gas, does not perform pretreatment on effective sample gas, and affects mass spectrum analysis if the sample contains particles, water vapor or has overlarge concentration or overlong pipeline loss, even damages a vacuum system and a detector of the mass spectrometer. The main working requirements and processes are as follows:

1. in different sampling sites, the retention time of the sample gas to the mass spectrum end needs to be changed according to actual conditions;

2. periodically measuring actual environment atmosphere, system background, standard gas signals and the like according to actual application conditions;

3. the sampling pipeline should not have the steam to exist, and more steam condensation not only influences the monitoring component, blocks up the pipeline moreover easily, probably influences vacuum system destruction equipment even.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects, the utility model provides a detection quality control operation of volatile organic compounds by periodically switching sample gas, zero gas and standard gas channels; and the temperature of the heat-insulating heating belt is used for controlling the outdoor sample introduction and gas stripping temperature, so that the consistency of the temperature of the measured outdoor gas and the temperature of the detected environment is ensured, the water vapor condensation caused by too high dew point is avoided, and the Volatile Organic Compounds (VOCs) to be detected, such as formaldehyde formic acid with high viscosity and the like, are reduced, so that the condition of inaccurate detection data caused by the retention loss of the substances in the pipeline is avoided.

The utility model provides a following technical scheme: the utility model provides a volatile organic compounds detects matter controlling means, includes the outdoor gas tetrafluoro filter that links to each other with outdoor gas air inlet, the indoor gas tetrafluoro filter that links to each other with indoor gas air inlet, with the indoor outer electromagnetic switching valve that advances that outdoor gas tetrafluoro filter and indoor gas tetrafluoro filter link to each other, outdoor gas tetrafluoro filter with indoor outer advance the electromagnetic switching valve and advance the appearance pipe intercommunication through the room, electromagnetic switching valve through advancing the appearance pipe with set up the drainage three way connection in the matter controlling means, the matter controlling means still includes flow controller, first catalysis except that zero-switching valve, second catalysis except that zero-switching valve, drainage pump, mark gas selection valve, platinum cotton catalysis tubular furnace, dry molecular sieve, environment sensing module, equipment interface module, valve body control module and temperature control module.

Further, the drainage tee is also respectively communicated with a flow controller and a first catalytic zero removal switching valve, the first catalytic zero removal switching valve is also respectively communicated with a second catalytic zero removal switching valve and a platinum wool catalytic tubular furnace, and the second catalytic zero removal switching valve is respectively communicated with a dry molecular sieve and a standard gas selective valve.

Furthermore, the standard gas gate valve is respectively communicated with a single standard gas inlet and a monitoring gas outlet which are arranged on the quality control device; the flow controller is communicated with a drainage pump for pumping an indoor gas sample and an outdoor sample into the quality control device, and the drainage pump 8 is communicated with a waste discharge port 13-1 arranged on the quality control device 20.

Furthermore, a heat preservation heating belt is arranged on a pipeline connecting the outdoor air tetrafluoro filter and the indoor and outdoor sample injection electromagnetic switching valve.

Furthermore, a water-vapor separator, a heating temperature measuring couple for feeding back the temperature of the sample inlet pipe and a negative pressure sensor arranged in the quality control device are sequentially arranged on the sample inlet pipe from left to right.

Further, the water-vapor separator is employed for preventing the intended external condensed water or the outdoor rainwater from flowing backward.

And furthermore, an outdoor sample injection pipe which is connected with the outdoor air tetrafluoro filter and is communicated with the indoor and outdoor sample injection electromagnetic switching valve adopts a quarter quartz pipe or less.

Furthermore, the device also comprises an outdoor temperature and humidity and raindrop sensor connected with the environment sensing module.

Further, the device still including set up in alarm lamp on the matter accuse device, the alarm lamp is used for the suggestion user in time operating means.

Further, the device also comprises a temperature limit switch which is connected with the temperature control module and the heat preservation heating belt.

The utility model has the advantages that:

1. the device can adjust the residence time of outdoor environment sample gas entering the inlet of the mass spectrometer at will through a panel or an upper computer by arranging a flow controller. Facilitating the change of sample gas flow rate under different circumstances.

2. The tetrafluoro outdoor sample inlet pipe for outdoor gas sample inlet is wrapped by a heat-insulating heating belt, and is kept at 30 ℃ or adjustable through a PID temperature controller control pipeline until reaching a sample inlet channel, so that the heat-insulating effect not only ensures that the sample temperature is consistent with the ambient temperature, but also avoids water vapor condensation caused by too high dew point, and can reduce the pipeline retention loss of VOCs (mainly formaldehyde formic acid and other species with larger viscosity)

3. The pipeline and the valve body through which the sample gas passes need to be made of polytetrafluoroethylene materials or 316L stainless steel materials with stable properties, so that the sample gas valve has the characteristics of corrosion resistance and smoothness, and the situation that the detection quality control accuracy is influenced due to the fact that formic acid, formaldehyde and other volatile organic compounds with high viscosity are stuck in the pipeline or the part of the device is prevented.

4. Through indoor outer humiture and raindrop sensor and indoor outer advance a kind electromagnetic switching valve linkage, rainy day and dew point temperature are too high automatic switch into indoor sampling. The outlet of the platinum cotton catalytic tubular furnace is connected with the dry molecular sieve or the active carbon, so that the zero removing operation can be further carried out on the air sample, and the zero removing efficiency is improved.

5. The device divides the sample gas entering the quality control device into two paths through a drainage tee joint, and one path of sample gas passes through a drainage pump through a flow controller without blockage and is finally discharged through a waste discharge port; one path of injection gas enters the platinum wool catalytic tubular furnace through the first catalytic zero-removal switching valve, then sequentially passes through the drying molecular sieve and the second catalytic zero-removal switching valve to be recombined into one path, finally passes through the standard gas gate valve and then enters the monitoring gas outlet 1 to be finally discharged, and the accuracy of detection quality control is further improved.

6. The platinum wool catalyst is installed in a tube furnace mode, so that consumable materials can be replaced conveniently. The platinum wool catalyst in the platinum wool catalytic tube furnace is arranged in a stainless steel tube made of 1/2 inches 316L material, and both ends of the platinum wool catalyst are connected by a 1/2-1/8 stainless steel clamping sleeve. The platinum cotton catalytic tube furnace adopts PID temperature control, has a temperature program function, and can be connected with a PC to check the working condition of the catalytic tube in real time.

7. The utility model can monitor the environment temperature in real time to adjust the heat preservation temperature of the sampling pipeline at any time, ensure the consistency of the measured outdoor gas and the detected environment temperature, avoid the water vapor condensation caused by too high dew point, and reduce the inaccurate detection data caused by the retention loss of the formaldehyde formic acid and other substances with larger viscosity in the detected volatile organic compounds in the pipeline; the sampling environment condition is judged in real time, and indoor and outdoor sampling channels are switched in time, so that invalid sampling and sampling hidden danger can be avoided; meanwhile, the variable adjustment of the drainage flow is more suitable for the application in different fields; the pressure of the sampling pipeline is monitored more effectively, so that the sampling accuracy is ensured, and the quality control requirement is met.

Drawings

The present invention will be described in more detail hereinafter based on embodiments and with reference to the accompanying drawings. Wherein:

fig. 1 is the utility model provides a whole schematic diagram of volatile organic compounds detection and quality control device.

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 only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the descriptions in this application as referring to "first", "second", etc. are 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 at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.

Next, all directional indicators (such as up, down, left, right, front, and back) in the embodiments of the present application are only used to explain the relative position relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly, and the connection may be a direct connection or an indirect connection.

As shown in figure 1, for the utility model provides a volatile organic compounds detects matter accuse device, include outdoor gas tetrafluoro filter 1 that links to each other with outdoor gas air inlet 1-1, indoor gas tetrafluoro filter 2 that links to each other with indoor gas air inlet 2-1, the indoor outer sample introduction electromagnetic switch valve 6 that links to each other with outdoor gas tetrafluoro filter 1 and indoor gas tetrafluoro filter 2, outdoor gas tetrafluoro filter 1 and indoor outer sample introduction electromagnetic switch valve 6 are through outdoor sample introduction pipe 3 intercommunication, electromagnetic switch valve 6 is connected with drainage tee bend 10 that sets up in matter accuse device 20 through sample introduction pipe 6-1, matter accuse device 20 still includes flow controller 9, first catalysis except that zero switch valve 11, second catalysis except that zero switch valve 12, drainage pump 8, standard gas gating valve 13, platinum cotton catalysis tubular furnace 14, dry molecular sieve 15, environment sensing module 20-1, An equipment interface module 20-2, a valve body control module 20-3 and a temperature control module 20-4.

The pipeline through which the sample gas passes and the valve body are both made of polytetrafluoroethylene materials or 316L stainless steel materials with stable properties

The drainage three-way valve 10 is also respectively communicated with a flow controller 9 and a first catalytic zero-removal switching valve 11, the first catalytic zero-removal switching valve 11 is used for switching sample gas to remove zero or not to be treated, the first catalytic zero-removal switching valve 11 is also respectively communicated with a second catalytic zero-removal switching valve 12 and a platinum cotton catalytic tubular furnace 14, the second catalytic zero-removal switching valve 12 is respectively communicated with a dry molecular sieve 15 and a standard gas selective valve 13, and the standard gas selective valve 13 is used for regularly walking single-sign; platinum cotton catalysis tubular furnace 14 is arranged in getting rid of the VOCs in the sample gas through high temperature catalysis, the platinum cotton catalyst in the platinum cotton catalysis tubular furnace is installed in the nonrust steel pipe of 1/2 inches 316L material, both ends use 1/2 commentaries on classics 1/8's stainless steel card cover to connect, platinum cotton catalysis tubular furnace adopts PID temperature control, have the program heating function, can connect the PC and look over catalysis pipe behavior in real time, adopt the tubular furnace mode installation platinum cotton catalyst, the consumptive material of being convenient for is changed. The drying molecular sieve 15 acts on the enhanced VOCs removing effect, can be replaced by activated carbon, and the drying molecular sieve 15 or the activated carbon is connected to the outlet of the platinum wool catalytic tubular furnace 14, so that the zero removing operation can be further carried out on the air sample.

The standard gas gate valve 13 is respectively communicated with a single standard gas inlet 13-2 and a monitoring gas outlet 13-3 which are arranged on the quality control device 20; the flow controller 9 is communicated with a drainage pump 8 which is used for pumping the indoor gas sample and the outdoor sample into the quality control device 20, the flow controller 9 is used for adjusting the flow to achieve the set retention time of the sample gas, and the drainage pump 8 is communicated with a waste discharge port 13-1 arranged on the quality control device 20.

The device divides sample gas entering a quality control device 20 into two paths through a drainage tee joint 10, one path of sample gas passes through a flow controller 9 without blockage, passes through a drainage pump 8 and is finally discharged through a waste discharge port 13-1; one path of the sample gas enters the platinum wool catalytic tubular furnace 14 through the first catalytic zero-removal switching valve 11, then sequentially passes through the drying molecular sieve 15 and the second catalytic zero-removal switching valve 12 to be recombined into one path, finally passes through the standard gas gate valve 13, enters the monitoring gas outlet 13-3 and finally is discharged.

And a heat-preservation heating belt 4 is arranged on the outdoor sample inlet pipe 3 connecting the outdoor air tetrafluoro filter 1 and the indoor and outdoor sample inlet electromagnetic switching valve 6, and the heat-preservation heating belt 4 is used for heating the sampling pipeline.

The sampling pipe 6-1 is sequentially provided with a water-vapor separator 7, a heating temperature measuring couple 5 for feeding back the temperature of the sampling pipe 6-1 and a negative pressure sensor 19 arranged in the quality control device 20 from left to right. The negative pressure sensor 19 is used for monitoring the real-time negative pressure condition in the sampling pipeline, and can automatically cut off the power supply of the drainage pump and remind a user of overhauling under the condition of overlarge filter load or air leakage.

The water-vapor separator 7 adopts a U-shaped water seal structure, so that sample gas is prevented from leaking; used for preventing the intentional external condensed water or outdoor rainwater from flowing backwards. The pipeline connecting the outdoor air tetrafluoro filter 1 and the indoor and outdoor sample injection electromagnetic switching valve 6 is made of quarter quartz or less.

The device also comprises an outdoor temperature and humidity and raindrop sensor 16 connected with the environment sensing module 20-1, an alarm lamp 17 arranged on the quality control device and a temperature limit switch 18 connected with the temperature control module 20-4 and the heat preservation heating belt 4, wherein the outdoor temperature and humidity and raindrop sensor 16 is used for monitoring outdoor environment conditions in real time, so that the device can make appropriate response, the outdoor temperature and humidity and raindrop sensor 16 is linked with the indoor and outdoor sample introduction electromagnetic switching valve 6, the automatic switching is performed in rainy days and with overhigh dew point temperature to realize indoor sampling, the alarm lamp 17 is used for prompting a user to operate the device in time, the temperature limit switch 18 is used for cutting off a heating power supply when abnormal temperature control is performed, and the protection device is not damaged by high temperature.

The device monitors indoor and outdoor temperature and humidity in real time and signals received by the outdoor temperature and humidity and raindrop sensor 16, whether the dew point of the sample gas in the current pipeline is too high can be determined through monitoring of the outdoor temperature and humidity and raindrop sensor 16, and condensed water can be generated when the dew point exceeds the heat preservation temperature of the pipeline; by monitoring the raindrop signal, whether outdoor rain is unsuitable for sampling can be judged. After the two situations occur, the influence of moisture enriched in the pipeline is monitored and analyzed, the drainage pump 8 needs to be closed in time, and the electromagnetic switching valve 6 is switched to be an NC-COM passage to collect indoor sample gas. Meanwhile, whether the original sampling-zero calibration mode or the sampling mode is needed to be kept is set on the control panel according to the requirements of users.

The other one plays a role in monitoring abnormity is a negative pressure sensor 19, the negative pressure sensor 19 is used for monitoring the condition that the sampling pipeline has air leakage or the particulate matter filtering membrane is blocked, and an alarm is given when the pressure in the pipeline exceeds a safety range.

The utility model provides a volatile organic compounds detects matter accuse device's theory of operation as follows:

s1: collecting outdoor ambient air: opening a drainage pump 8, controlling to reach a preset flow through a flow controller 9, allowing outdoor air to be collected to enter an outdoor sample inlet pipe 3 through an outdoor tetrafluoro filter 1, allowing the outdoor air to enter a water-vapor separator 7 through a normally open end of an electromagnetic switching valve 6, allowing the outdoor air to directly pass through a negative pressure sensor 19, sequentially entering a drainage tee 10, the flow controller 9 and the drainage pump 8 to complete an external air drainage function, allowing another small-flow sample gas to enter an NO-COM end of a second catalytic zero-removal switching valve 12 through a COM-NO end of a first catalytic zero-removal switching valve 11 at the other end of the drainage tee 10, allowing the other small-flow sample gas to enter a monitoring gas outlet 13-3 through an NO-COM end of a standard gas selector valve 13, and allowing the small-flow sample gas to enter an analyzer for analysis;

s2: zero calibration is performed by collecting outdoor ambient air: after outdoor air enters the drainage tee joint 10, the first catalytic zero-removal switching valve 11 and the second catalytic zero-removal switching valve 12 are opened, and the air sequentially enters the platinum wool catalytic tubular furnace 14, the dry molecular sieve 15, the NC-COM end of the second catalytic zero-removal switching valve 12 and the NO-COM end of the standard air selector valve 13 after passing through the COM-NC end of the first catalytic zero-removal switching valve 11 and enters an analyzer through a monitoring air outlet 13-3;

the step S1 and the step S2 are circularly performed, and after the step S1 is operated for 2h, the operation is switched to the step S2 to be operated for 15min, so that a cycle period is formed.

Further, before the operations of the steps S1 and S2, there are the following steps:

and closing the drainage pump 8, opening the NC-COM end of the standard gas selective valve 13, continuously introducing for 15min through the single standard gas inlet 13-2, then entering the step S1 to collect an outdoor gas sample, verifying the span accuracy of the analyzer by presetting standard gas with single concentration, and ensuring that the analyzer is in a quality control state by combining span standard gas verification with daily zero gas background verification.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present invention is not limited to the particular embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. The utility model provides a volatile organic compounds detects matter accuse device, its characterized in that includes outdoor gas tetrafluoro filter (1) that links to each other with outdoor gas air inlet, indoor gas tetrafluoro filter (2) that link to each other with indoor gas air inlet, with indoor outer appearance electromagnetism diverter valve (6) of advancing that outdoor gas tetrafluoro filter (1) and indoor gas tetrafluoro filter (2) link to each other, outdoor gas tetrafluoro filter (1) with indoor outer appearance electromagnetism diverter valve (6) of advancing advance through outdoor appearance pipe (3) intercommunication, electromagnetism diverter valve (6) are connected with drainage tee bend (10) that set up in matter accuse device (20) through advancing appearance pipe (6-1), matter accuse device (20) still include flow controller (9), first catalysis except zero diverter valve (11), second catalysis except zero diverter valve (12), drainage pump (8), standard gas selection valve (13), The device comprises a platinum cotton catalytic tubular furnace (14), a dry molecular sieve (15), an environment sensing module (20-1), an equipment interface module (20-2), a valve body control module (20-3) and a temperature control module (20-4).

2. The detection and quality control device for the volatile organic compounds according to claim 1, wherein the drainage tee (10) is further respectively communicated with a flow controller (9) and a first catalytic zero-removal switching valve (11), the first catalytic zero-removal switching valve (11) is further respectively communicated with a second catalytic zero-removal switching valve (12) and a platinum wool catalytic tubular furnace (14), and the second catalytic zero-removal switching valve (12) is respectively communicated with a dry molecular sieve (15) and a standard gas selective valve (13).

3. The detection and quality control device for the volatile organic compounds according to claim 1, wherein the standard gas gate valve (13) is respectively communicated with a single standard gas inlet (13-2) and a monitoring gas outlet (13-3) which are arranged on the quality control device (20); the flow controller (9) is communicated with a drainage pump (8) which is used for pumping the indoor gas sample and the outdoor sample into the quality control device (20), and the drainage pump (8) is communicated with a waste discharge port (13-1) arranged on the quality control device (20).

4. The VOC detection and quality control device according to claim 1, wherein a heat-preservation heating band (4) is arranged on a pipeline connecting the outdoor air PTFE filter (1) and the indoor and outdoor sample injection electromagnetic switching valve (6).

5. The detection and quality control device for the volatile organic compounds according to claim 1, wherein the sample inlet pipe (6-1) is sequentially provided with a water-vapor separator (7), a heating temperature measurement couple (5) for feeding back the temperature of the sample inlet pipe (6-1), and a negative pressure sensor (19) arranged in the quality control device (20) from left to right.

6. The VOC detection and quality control device according to claim 5, wherein said water-vapor separator (7) is used for preventing the intentional backflow of condensed water or rainwater outside the room.

7. The VOC detection and quality control device according to claim 1, wherein an outdoor sample introduction pipe (3) connecting the outdoor PTFE filter (1) and the indoor and outdoor sample introduction electromagnetic switching valve (6) is a quarter quartz pipe or less.

8. The voc detection and quality control apparatus according to claim 1, further comprising an outdoor temperature, humidity and raindrop sensor (16) connected to the environmental sensing module (20-1).

9. The voc detection and quality control device according to claim 1, further comprising a warning lamp (17) disposed on the quality control device for prompting a user to operate the device in time.

10. The VOC detection and quality control device according to claim 4, further comprising a temperature limit switch (18) connecting the temperature control module (20-4) and the heat-preservation heating belt (4).