CN114755071A - Overall process VOCs prevents adsorbing sampling device - Google Patents

Overall process VOCs prevents adsorbing sampling device Download PDF

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Publication number
CN114755071A
CN114755071A CN202210570164.2A CN202210570164A CN114755071A CN 114755071 A CN114755071 A CN 114755071A CN 202210570164 A CN202210570164 A CN 202210570164A CN 114755071 A CN114755071 A CN 114755071A
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CN
China
Prior art keywords
sampling
ptfe
peristaltic pump
explosion
pipe
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210570164.2A
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Chinese (zh)
Inventor
黄敏超
蔡梅
庄思源
于喆
崔积山
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Environmental Engineering Evaluation Center Of Ministry Of Ecology And Environment
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Environmental Engineering Evaluation Center Of Ministry Of Ecology And Environment
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Priority to CN202210570164.2A priority Critical patent/CN114755071A/en
Publication of CN114755071A publication Critical patent/CN114755071A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/2273—Atmospheric sampling
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
    • G01N1/2205—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with filters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/24—Suction devices

Abstract

The invention relates to the technical field of environmental waste gas sampling, in particular to an all-process VOCs (volatile organic compounds) adsorption-prevention sampling device, which solves the problem of the existing waste gas displacement and discharge, simultaneously uses a sampling material made of an adsorption-prevention PTFE (polytetrafluoroethylene) material in the all-process, ensures that no loss exists in the waste gas sampling process, does not influence the actual monitoring result, realizes one-key automatic sampling, is convenient to operate, and can adapt to the sampling use in more occasions due to the explosion-proof performance of an explosion-proof peristaltic pump; including exhaust duct, sampling pipe, explosion-proof peristaltic pump, peristaltic pump pipe, PTFE sampling air pocket, PTFE three-way valve and PTFE connecting pipe, the explosion-proof peristaltic pump is packed into and is fixed to the peristaltic pump pipe, is provided with control panel on the explosion-proof peristaltic pump to the inside sensor that is provided with of explosion-proof peristaltic pump, the sensor can be to PTFE three-way valve control, and the sampling pipe is connected to the inlet end of peristaltic pump pipe, and the sampling pipe left side is provided with the PTFE filter head, and the PTFE filter head is located exhaust duct.

Description

Overall process VOCs prevents adsorbing sampling device
Technical Field
The invention relates to the technical field of environmental waste gas sampling, in particular to an anti-adsorption sampling device for VOCs in the whole process.
Background
In recent years, the problem of atmospheric composite pollution in China is increasingly serious, high-concentration near-ground ozone pollution and secondary organic aerosol pollution events are frequent, sustainable development of social economy is severely restricted, and human health and atmospheric environment quality are influenced. Volatile organic compounds are used as one of key precursors for forming O3 and PM2.5, and effective control and reduction of the volatile organic compounds play a vital role in improving air quality in China. The VOCs are taken as unconventional pollutants, compared with conventional pollutants such as NOx, SO2 and the like, the VOCs have the typical characteristics of numerous sources, wide pollution source items, various types of substances, disorganized emission as a main part, complex emission accounting, incomplete system, incomplete monitoring and analysis system, weak related research foundation and the like, the conventional sampling means of the waste gas at the present stage is mainly carried out according to a sampling air bag method for fixing volatile organic compounds of the waste gas of the pollution source, and the waste gas discharged by a discharge cylinder of the fixed pollution source is directly collected and stored in a fluoropolymer film air bag with excellent chemical inertness by using equipment such as a vacuum sampling box, an air suction pump and the like, and the vacuum sampling box at the present stage has the following problems: 1. in the sampling process, the situation that the waste gas is directly discharged by the sampling bag replacement exists, and in many sampling processes at the present stage, the active carbon filter is not used for carrying out opposite ventilation treatment, and the direct discharge replacement gas can cause pollution; 2. at present, FEP sampling bags are basically used for sampling, and sampling pipes are only soft rubber pipes, so that certain adsorption effect on volatile organic gas is achieved, and finally the monitoring result is smaller.
Disclosure of Invention
In order to solve the technical problems, the invention provides the whole-process VOCs (volatile organic compounds) adsorption-prevention sampling device which solves the problem of the existing waste gas displacement and discharge, simultaneously uses a sampling material made of an adsorption-prevention PTFE material in the whole process, ensures that waste gas is not lost in the sampling process, does not influence the actual monitoring result, automatically samples in one key mode, is convenient to operate, and has explosion-proof performance suitable for being used for sampling in more occasions.
The invention relates to a whole-process VOCs (volatile organic chemicals) adsorption-prevention sampling device which comprises an exhaust pipeline, a sampling pipe, an explosion-proof peristaltic pump, a peristaltic pump pipe, a PTFE (polytetrafluoroethylene) sampling air bag, a PTFE (polytetrafluoroethylene) three-way valve and a PTFE connecting pipe, wherein the peristaltic pump pipe is installed in the explosion-proof peristaltic pump and fixed, a control panel is arranged on the explosion-proof peristaltic pump, a sensor is arranged in the explosion-proof peristaltic pump and can control the PTFE three-way valve, the air inlet end of the peristaltic pump pipe is connected with the sampling pipe, the left side of the sampling pipe is provided with a PTFE (polytetrafluoroethylene) filter head which is positioned in the exhaust pipeline, the air outlet end of the peristaltic pump pipe is connected with the PTFE three-way valve, the right end of the PTFE three-way valve is connected with the PTFE sampling air bag, the PTFE sampling air bag is provided with a pressure sensor, the top end of the PTFE three-way valve is communicated with the PTFE connecting pipe, and the other end of the PTFE connecting pipe is communicated with the exhaust pipeline; the method comprises the steps of clicking a start sampling button of an anti-explosion peristaltic pump control panel before sampling, controlling a rotary PTFE three-way valve through a built-in sensor of the anti-explosion peristaltic pump, connecting a PTFE sampling air bag into a flow path, reversely rotating the anti-explosion peristaltic pump, pumping out residual gas in the PTFE sampling air bag, automatically closing the PTFE three-way valve by a system after a pressure sensor on the PTFE sampling air bag sends a signal of micro negative pressure of the PTFE sampling air bag, simultaneously changing the rotation direction of the anti-explosion peristaltic pump into forward rotation, connecting a PTFE connecting pipe into the flow path system by the built-in sensor of the anti-explosion peristaltic pump, introducing the PTFE sampling air bag into an exhaust pipeline through the PTFE connecting pipe, controlling the rotary PTFE three-way valve by the built-in sensor of the anti-explosion peristaltic pump after replacement is finished, realizing that the sampling pipe is connected into the flow path system, starting sampling when the anti-explosion peristaltic pump rotates forward, prompting the anti-explosion peristaltic pump control panel to sample a character of sampling, after the sampling volume of the PTFE sampling air bag is enough, a pressure sensor on the PTFE sampling air bag sends a rotation stop signal to a control panel of the explosion-proof peristaltic pump, the explosion-proof peristaltic pump stops rotating, the sampling process is finished, the control panel of the explosion-proof peristaltic pump prompts a character of 'sampling end', a point source button of the explosion-proof peristaltic pump is closed, the PTFE sampling air bag is taken down and a sealing cap is sleeved on the PTFE sampling air bag, the phenomenon of exhaust gas replacement in the prior art is solved, meanwhile, a sampling material made of an adsorption-proof PTFE material is used in the whole process, the waste gas is guaranteed not to be lost in the sampling process, the actual monitoring result is not influenced, and the one-key type automatic sampling is convenient to operate; and the explosion-proof performance of the explosion-proof peristaltic pump can be suitable for sampling in more occasions.
Preferably, the system also comprises a telescopic pipeline sealing plug, the telescopic pipeline sealing plug is arranged at the joint of the sampling pipe and the exhaust pipeline and the joint of the PTFE connecting pipe and the exhaust pipeline, and a photosensitive sensor is arranged in the telescopic pipeline sealing plug; through setting up scalable pipeline sealing plug, the built-in sensitive sensor of scalable pipeline sealing plug of being convenient for records the pipe diameter size of sampling pipe or PTFE connecting pipe to according to the change automatic adjustment of pipe diameter its rubber buffer internal diameter size, prevent that the flue gas in the exhaust duct from escaping outward, the leakproofness of improvement.
Preferably, a heating belt is arranged on the sampling pipe; through setting up the heating band, heat the sampling gas for gas molecule activity improves the velocity of flow, improves the speed of sampling.
Preferably, an LED lamp sensor is arranged on the explosion-proof peristaltic pump; through setting up LED lamp sensor, be convenient for can guarantee to sample normally under the unfavorable condition of light, improve the use convenience of device.
Compared with the prior art, the invention has the beneficial effects that: clicking a start sampling button of an anti-explosion peristaltic pump control panel before sampling can automatically start a lamp switch to ensure that the condition of sufficient light is provided for normal sampling, controlling a rotary PTFE three-way valve by a built-in sensor of the anti-explosion peristaltic pump, connecting a PTFE sampling air bag into a flow path, reversely rotating the anti-explosion peristaltic pump, pumping out residual gas in the PTFE sampling air bag, automatically closing the PTFE three-way valve by a system after a pressure sensor on the PTFE sampling air bag sends a signal of micro negative pressure of the PTFE sampling air bag, simultaneously changing the rotation direction of the anti-explosion peristaltic pump into forward rotation, controlling the rotary PTFE three-way valve by the built-in sensor of the anti-explosion peristaltic pump, connecting a PTFE connecting pipe into the flow path system, introducing gas participating in the PTFE sampling air bag into an exhaust pipeline by the PTFE connecting pipe, controlling the rotary PTFE three-way valve by the built-in sensor of the anti-explosion peristaltic pump after replacement is finished, and realizing that the sampling pipe is connected into the flow path system, the sampling is started by the forward rotation of the anti-explosion peristaltic pump, the control panel of the anti-explosion peristaltic pump prompts the character of 'sampling', after the sampling volume of the PTFE sampling air bag is enough, a pressure sensor on the PTFE sampling air bag sends a rotation stop signal to the control panel of the anti-explosion peristaltic pump, the anti-explosion peristaltic pump stops rotating, the end of the sampling process is realized, the control panel of the anti-explosion peristaltic pump prompts the character of 'sampling end', a point source button of the anti-explosion peristaltic pump is closed, the PTFE sampling air bag is taken down and a sealing cap is sleeved on the PTFE sampling air bag, the phenomenon of the existing waste gas replacement and discharge is solved, meanwhile, the sampling material made of the anti-adsorption PTFE material is used in the whole process, the waste gas is ensured not to be lost in the sampling process, the actual monitoring result is not influenced, and the sampling is carried out in a key type, so that the operation is convenient; and the explosion-proof performance of the explosion-proof peristaltic pump can be suitable for sampling in more occasions.
Drawings
FIG. 1 is a front sectional structural schematic view of the present invention.
In the drawings, the reference numbers: 1. an exhaust duct; 2. a sampling tube; 3. a retractable pipeline sealing plug; 4. heating the tape; 5. an explosion-proof peristaltic pump; 6. a peristaltic pump tube; 7. a PTFE sampling air bag; 8. a PTFE three-way valve; 9. a PTFE connecting pipe; 10. a pressure sensor; 11. LED lamp sensor.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
As shown in figure 1, the peristaltic pump pipe 6 is installed in the anti-explosion peristaltic pump 5 and fixed, a control panel is arranged on the anti-explosion peristaltic pump 5, an LED lamp sensor 11 is arranged on the anti-explosion peristaltic pump 5, a sensor is arranged inside the anti-explosion peristaltic pump 5 and can control a PTFE three-way valve 8, a sampling pipe 2 is connected to the air inlet end of the peristaltic pump pipe 6, a PTFE filter head is arranged on the left side of the sampling pipe 2 and is positioned in an exhaust pipeline 1, a heating belt 4 is arranged on the sampling pipe 2, a PTFE three-way valve 8 is connected to the air outlet end of the peristaltic pump pipe 6, the right end of the PTFE three-way valve 8 is connected with a PTFE sampling air bag 7 to reduce the dead volume to the maximum extent, a connecting pipeline is as short as possible, a pressure sensor 10 is arranged on the PTFE sampling air bag 7, the top end of the PTFE three-way valve 8 is communicated with a PTFE connecting pipe 9, the other end of the PTFE connecting pipe 9 is communicated with the exhaust pipeline 1, a telescopic pipeline sealing plug 3 is installed on the sampling pipe 2 and the exhaust pipeline 1, and the PTFE connecting pipe 9 and an exhaust pipe A photosensitive sensor is arranged in a telescopic pipeline sealing plug 3 at the joint of the pipeline 1; firstly, clicking a start sampling button of a control panel of an explosion-proof peristaltic pump 5 before sampling, if the environment is dark at the moment, an LED lamp sensor 11 can automatically start a lamp switch to ensure that the condition of providing sufficient light is normally sampled, controlling a rotary PTFE three-way valve 8 through a built-in sensor of the explosion-proof peristaltic pump 5, connecting a PTFE sampling air bag 7 into a flow path, reversely rotating the explosion-proof peristaltic pump 5 to pump out residual gas in the PTFE sampling air bag 7, automatically closing the PTFE three-way valve 8 after a pressure sensor 10 on the PTFE sampling air bag 7 sends a signal of micro negative pressure of the PTFE sampling air bag 7, simultaneously changing the rotation direction of the explosion-proof peristaltic pump 5 into forward rotation, controlling the rotary PTFE three-way valve 8 through the built-in sensor of the explosion-proof peristaltic pump 5, connecting a PTFE connecting pipe 9 into the flow path system, introducing the PTFE sampling air bag 7 into an exhaust pipeline 1 through the PTFE connecting pipe 9, and after replacement is finished, the built-in sensor of the anti-explosion peristaltic pump 5 controls the rotary PTFE three-way valve 8 to realize that the sampling pipe 2 is connected into a flow path system, the anti-explosion peristaltic pump 5 starts sampling when rotating in the forward direction, a control panel of the anti-explosion peristaltic pump 5 prompts the character of 'sampling' when the sampling volume of the PTFE sampling air bag 7 is enough, a pressure sensor 10 on the PTFE sampling air bag 7 sends a rotation stop signal to the control panel of the anti-explosion peristaltic pump 5, the anti-explosion peristaltic pump 5 stops rotating to realize the end of the sampling process, the control panel of the anti-explosion peristaltic pump 5 prompts the character of 'sampling end' when the control panel of the anti-explosion peristaltic pump 5 is closed, the PTFE sampling air bag 7 is taken down and a sealing cap is sleeved on the anti-explosion peristaltic pump 5, the existing phenomenon of waste gas replacement and exhaust emission is solved, meanwhile, the sampling material made of anti-adsorption PTFE material is used in the whole process, no loss of waste gas in the sampling process is ensured, the actual monitoring result is not influenced, and the sampling is automatically carried out in a key mode, convenient operation, and the sampling under the explosion-proof performance adaptable more occasions of explosion-proof peristaltic pump 5 is used, later through setting up scalable pipeline sealing plug 3, the built-in quick sensor of scalable pipeline sealing plug 3 of being convenient for records the pipe diameter size of sampling pipe 2 or PTFE connecting pipe 9, and its rubber buffer internal diameter size of automatic adjustment according to the change of pipe diameter, prevent that the flue gas in the exhaust duct 1 from escaping outward, the leakproofness of improvement, then through setting up heating tape 4, to the heating of sampling gas, accelerate gas molecule activity, the velocity of flow is improved, the speed of sampling is improved.
According to the whole-process VOCs adsorption-prevention sampling device, the installation mode, the connection mode or the setting mode are common mechanical modes, and the device can be implemented as long as the beneficial effects can be achieved; the telescopic pipeline sealing plug 3, the heating belt 4, the anti-explosion peristaltic pump 5, the PTFE three-way valve 8, the pressure sensor 10 and the LED lamp sensor 11 of the whole-process VOCs anti-adsorption sampling device are purchased on the market, the installation mode, the connection mode or the arrangement mode is a common mode, the specific structures, the models and the coefficient indexes of all the components are self-contained technologies, and the device can be implemented as long as the beneficial effects can be achieved.
All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make various improvements and modifications without departing from the technical principle of the present invention, and those improvements and modifications should be also considered as the protection scope of the present invention.

Claims (4)

1. The whole-process VOCs adsorption-prevention sampling device is characterized by comprising an exhaust pipeline (1), a sampling pipe (2), an explosion-proof peristaltic pump (5), a peristaltic pump pipe (6), a PTFE sampling air bag (7), a PTFE three-way valve (8) and a PTFE connecting pipe (9), wherein the peristaltic pump pipe (6) is installed in the explosion-proof peristaltic pump (5) and fixed, the explosion-proof peristaltic pump (5) is provided with a control panel, a sensor is arranged in the explosion-proof peristaltic pump (5) and can control the PTFE three-way valve (8), the air inlet end of the peristaltic pump pipe (6) is connected with the sampling pipe (2), the left side of the sampling pipe (2) is provided with a PTFE filter head, the PTFE filter head is positioned in the exhaust pipeline (1), the air outlet end of the peristaltic pump pipe (6) is connected with the PTFE three-way valve (8), the right end of the PTFE three-way valve (8) is connected with the sampling PTFE air bag (7) (in order to reduce the dead volume to the maximum extent, the connecting pipeline is as short as possible), a pressure sensor (10) is arranged on the PTFE sampling air bag (7), the top end of the PTFE three-way valve (8) is communicated with a PTFE connecting pipe (9), and the other end of the PTFE connecting pipe (9) is communicated with the exhaust pipeline (1).
2. The whole-process VOCs adsorption-prevention sampling device of claim 1, further comprising a retractable pipeline sealing plug (3), wherein the retractable pipeline sealing plug (3) is installed at the joint of the sampling pipe (2) and the exhaust pipeline (1) and the joint of the PTFE (Polytetrafluoroethylene) connecting pipe (9) and the exhaust pipeline (1), and a photosensitive sensor is arranged in the retractable pipeline sealing plug (3).
3. The whole-process VOCs anti-adsorption sampling device of claim 1, wherein the sampling tube (2) is provided with a heating tape (4).
4. The anti-adsorption sampling device of whole-process VOCs as recited in claim 1, wherein said anti-explosion peristaltic pump (5) is provided with an LED light sensor (11).
CN202210570164.2A 2022-05-24 2022-05-24 Overall process VOCs prevents adsorbing sampling device Pending CN114755071A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210570164.2A CN114755071A (en) 2022-05-24 2022-05-24 Overall process VOCs prevents adsorbing sampling device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210570164.2A CN114755071A (en) 2022-05-24 2022-05-24 Overall process VOCs prevents adsorbing sampling device

Publications (1)

Publication Number Publication Date
CN114755071A true CN114755071A (en) 2022-07-15

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Application Number Title Priority Date Filing Date
CN202210570164.2A Pending CN114755071A (en) 2022-05-24 2022-05-24 Overall process VOCs prevents adsorbing sampling device

Country Status (1)

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CN (1) CN114755071A (en)

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