Soil VOC (volatile organic compound) monitoring and sampling system
By switching the channel control module in the soil VOC monitoring sampling system, the detection of low-concentration VOCs was expanded, solving the problem of inaccurate monitoring results when the VOC concentration in soil atmosphere is low, improving monitoring accuracy and saving energy.
Patent Information
- Application Number
- CN202422635842.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-30
- Publication Date
- 2025-10-24
- Estimated Expiration
- 2034-10-30
AI Technical Summary
When the concentration of VOCs in soil gas is low, the accuracy of monitoring results is poor. Existing technologies cannot accurately measure or detect them, leading to misjudgments or omissions of pollution.
Design a soil VOC monitoring sampling system, including a sampling module, an adsorption module, and a delivery module. The system switches channels through a control module, allowing soil gas to enter a temperature control component for cooling and heating to increase VOC concentration when the concentration is low, and directly enter the control module when the concentration is high, thus achieving accurate detection.
It improves the accuracy of soil VOC monitoring, reduces misjudgments or omissions, saves energy, and reduces costs.
Smart Images
Figure CN223470849U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of VOC monitoring sampling, and particularly relates to a soil VOC monitoring sampling system. BACKGROUND
[0002] With the continuous improvement of industrial modernization, a large number of contaminated sites are left in large and medium-sized cities, and the degree of soil and groundwater pollution is increasingly valued. VOC (volatile organic compounds) is a kind of organic matter that is easy to volatilize and mix with air at normal temperature and pressure, and widely exists in industrial emissions, automobile exhaust, paint coatings, pesticide use and other fields. In soil, VOC mainly comes from improper treatment of industrial waste, excessive use of pesticides and fertilizers, and oil and gas leakage. These VOCs accumulate in the soil, not only affecting soil quality, but also possibly entering the atmosphere and groundwater through volatilization, percolation and other means, posing a threat to the ecological environment.
[0003] Soil VOC online monitor is one of the important means to solve the current soil pollution problem. Soil VOC online monitoring can continuously and real-time monitor the VOC concentration change in soil, and can timely find the pollution source and take effective measures for treatment.
[0004] In the case of low VOC concentration in soil gas, it is difficult to accurately measure or even detect these low-concentration VOCs, which may lead to misjudgment or omission of pollution conditions, affecting the accuracy of monitoring results. UTILITY MODEL CONTENT
[0005] The utility model embodiment provides a kind of soil VOC monitoring sampling system, to solve the technical problem of low accuracy of monitoring result when VOC concentration in soil gas is low.
[0006] To achieve the above purpose, the technical scheme adopted by the utility model is: a soil VOC monitoring sampling system is provided, comprising:
[0007] Sampling module is used to insert into soil and collect soil gas;
[0008] Adsorption module has temperature control assembly for cooling and heating the soil gas;
[0009] Control module;
[0010] Conveying module is communicated between the sampling module and the control module, and has first channel and second channel, only the second channel is communicated with the temperature control assembly;
[0011] Wherein, when the parameter of the soil gas to be detected is higher than the preset value, the control module closes the second channel, at this time the soil gas enters the control module through the first channel; when the parameter of the soil gas to be detected is lower than or equal to the preset value, the control module closes the first channel, at this time the soil gas enters the control module through the second channel.
[0012] In a possible implementation, the temperature control assembly comprises an adsorption chamber and a temperature adjusting member, the temperature adjusting member is fixed to the side wall of the adsorption chamber and is used for adjusting the temperature in the adsorption chamber.
[0013] In a possible implementation, the side wall opposite to the temperature adjusting member of the adsorption chamber is fixed with a heat insulation sheet, and the periphery of the adsorption chamber is wrapped with thermal insulation cotton.
[0014] In a possible implementation, the temperature adjusting member is located outside the thermal insulation cotton.
[0015] In a possible implementation, the adsorption chamber is filled with activated carbon.
[0016] In a possible implementation, the conveying module has an air inlet pipe connected to the sampling module and an air outlet pipe connected between the temperature control assembly and the control module, the air inlet pipe has a first shunt pipe connected to the control module and a second shunt pipe connected to the temperature control assembly, the first shunt pipe forms the first channel, the air outlet pipe and the second shunt pipe form the second channel, and the temperature control assembly is connected between the air outlet pipe and the second shunt pipe.
[0017] Wherein, when the parameter of the soil gas to be detected is higher than the preset value, the control module closes the air outlet pipe, at this time the soil gas enters the control module through the air inlet pipe and the first shunt pipe in sequence; when the parameter of the soil gas to be detected is lower than or equal to the preset value, the control module closes the first shunt pipe, at this time the soil gas enters the control module through the air inlet pipe, the second shunt pipe and the air inlet pipe in sequence.
[0018] In a possible implementation, the sampling module comprises a pipe for insertion into soil and a connecting pipe connected between the pipe and the air inlet pipe, the top end of the pipe is fixed with a force receiving disc, and the outer wall of the pipe is provided with a through hole communicating with the inner cavity of the pipe.
[0019] In a possible implementation, the bottom end of the pipe is a pointed end.
[0020] In a possible implementation, the adsorption module further comprises a heat dissipation assembly, and the heat dissipation assembly is used for dissipating heat of the soil VOC monitoring sampling system.
[0021] In a possible implementation, the heat dissipation assembly comprises an air duct and a fan in communication with the air duct.
[0022] The fan is in abutment with the temperature control assembly.
[0023] Compared with the prior art, the soil VOC monitoring sampling system has the advantages that:
[0024] When the VOC concentration in the soil gas is lower than or equal to the preset value, the first channel is closed, the soil gas collected by the sampling module enters the temperature control assembly through the inlet of the second channel under the control of the control module, and the VOC concentration in the soil gas is expanded by switching between cooling and heating in the temperature control assembly. Finally, the soil gas enters the control module from the outlet of the second channel, so that the VOC in the soil gas can also be detected when the VOC concentration is low, reducing the phenomenon of misjudgment or omission of pollution, and improving the accuracy of the monitoring result. When the VOC in the soil gas is higher than the preset value, the second channel is closed, and the soil gas collected by the sampling module directly enters the control module through the first channel under the control of the control module. At this time, the VOC concentration in the soil gas does not need to be expanded in the temperature control assembly, energy is saved, and cost is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0025] Figure 1 The partial schematic view of the adsorption module, the control module and the conveying module is provided for the embodiments of the utility model;
[0026] Figure 2 The explosion view of the heat insulation sheet, the adsorption chamber and the temperature adjusting piece is provided for the embodiments of the utility model;
[0027] Figure 3 The structure schematic view of the sampling module is provided for the embodiments of the utility model;
[0028] Figure 4 The system guide view of the soil gas flow direction is provided for the embodiments of the utility model.
[0029] MARKS OF THE DRAWINGS:
[0030] 10, sampling module; 101, cannula; 1011, stress disc; 1012, through hole; 102, connecting pipe;
[0031] 20, adsorption module; 201, adsorption chamber; 2011, heat insulation sheet; 2012, heat preservation cotton; 202, temperature adjusting piece; 203, air duct; 204, fan;
[0032] 30, control module;
[0033] 40. Delivery module; 401. Air inlet pipe; 402. Ventilation pipe; 403. First diversion pipe; 404. Second diversion pipe. DETAILED DESCRIPTION
[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0035] Please also refer to Figures 1 to 4 The present invention describes a soil VOC monitoring and sampling system. The system comprises a sampling module 10, an adsorption module 20, a control module 30, and a delivery module 40. The sampling module 10 is inserted into the soil to collect soil gas. The adsorption module 20 includes a temperature control component for cooling and heating the soil gas. The delivery module 40 communicates between the sampling module 10 and the control module 30 and has a first channel and a second channel, with only the second channel communicating with the temperature control component.
[0036] Among them, when the soil gas parameter to be detected is higher than the preset value, the control module 30 closes the second channel, and the soil gas enters the control module 30 through the first channel; when the soil gas parameter to be detected is lower than or equal to the preset value, the control module 30 closes the first channel, and the soil gas enters the control module 30 through the second channel.
[0037] Specifically, the control module 30 may be a three-way solenoid valve. The control module 30 is connected to a VOC monitor. After the soil gas enters the control module 30 , it enters the VOC monitor for detection.
[0038] Compared with the prior art, the soil VOC monitoring and sampling system provided in this embodiment has the following advantages:
[0039] When the VOC concentration in the soil gas is lower than or equal to the preset value, the first channel is closed, and the soil gas collected by the sampling module 10 enters the temperature control component through the inlet of the second channel under the control of the control module 30. The concentration of VOC in the soil gas is increased by switching back and forth between cooling and heating the soil gas in the temperature control component, and finally enters the control module 30 from the outlet of the second channel. Therefore, even when the VOC concentration in the soil gas is low, it can be detected, reducing the occurrence of misjudgment or omission of pollution conditions and improving the accuracy of monitoring results; when the VOC in the soil gas is higher than the preset value, the second channel is closed, and the soil gas collected by the sampling module 10 enters the control module 30 directly through the first channel under the control of the control module 30. At this time, there is no need to enter the temperature control component to increase the concentration of VOC in the soil gas, saving energy and reducing costs.
[0040] In some embodiments, referenceFigure 2 The temperature control assembly comprises the adsorption chamber 201 and a temperature adjusting member 202, and the temperature adjusting member 202 is fixed to the side wall of the adsorption chamber 201 and used for adjusting the temperature in the adsorption chamber 201.
[0041] Specifically, the temperature adjusting member 202 can be a semiconductor refrigeration sheet.
[0042] The temperature adjusting member 202 has a first working temperature and a second working temperature, and the adsorption chamber 201 is controlled to switch between the first working temperature and the second working temperature, the first working temperature is between 23℃-26℃, and the second working temperature is between 92℃-96℃, so as to concentrate and enrich the low-concentration VOC gas to be measured, thereby facilitating more accurate measurement.
[0043] In some embodiments, referring to Figure 2 The side wall opposite to the temperature adjusting member 202 of the adsorption chamber 201 is fixed with a heat insulation sheet 2011, and the outer periphery of the adsorption chamber 201 is wrapped with thermal insulation cotton 2012.
[0044] In some embodiments, the temperature adjusting member 202 is located outside the thermal insulation cotton 2012.
[0045] By setting the heat insulation sheet 2011 and the thermal insulation cotton 2012, the adsorption chamber 201 is isolated from the outside world, the heat exchange between the adsorption chamber 201 and the outside world is reduced, and the temperature stability in the adsorption chamber 201 is improved; the thermal insulation cotton 2012 does not wrap the temperature adjusting member 202, and the heat dissipation effect of the temperature adjusting member 202 is enhanced, thereby improving the working stability of the temperature adjusting member 202.
[0046] In some embodiments, referring to Figure 2 The adsorption chamber 201 is filled with activated carbon, when the adsorption chamber 201 is heated, the impurities adsorbed in the activated carbon can be removed, the purity of the zero point when measuring low concentration is ensured, and the occurrence of zero point background concentration problem is reduced.
[0047] In some embodiments, referring to Figure 1 , Figure 3 and Figure 4 The conveying module 40 has a gas inlet pipe 401 connected to the sampling module 10 and a gas outlet pipe 402 connected between the temperature control assembly and the control module 30, the gas inlet pipe 401 has a first shunt pipe 403 connected to the control module 30 and a second shunt pipe 404 connected to the temperature control assembly, the first shunt pipe 403 forms a first channel, the gas outlet pipe 402 and the second shunt pipe 404 form a second channel, and the temperature control assembly is connected between the gas outlet pipe 402 and the second shunt pipe 404.
[0048] When the parameter of the soil gas to be detected is higher than the preset value, the control module 30 closes the air pipe 402, and at this time, the soil gas enters the control module 30 in sequence through the air inlet pipe 401 and the first shunt pipe 403; when the parameter of the soil gas to be detected is lower than or equal to the preset value, the control module 30 closes the first shunt pipe 403, and at this time, the soil gas enters the control module 30 in sequence through the air inlet pipe 401, the second shunt pipe 404 and the air inlet pipe 401.
[0049] In some embodiments, referring to Figure 3 The sampling module 10 comprises a pipe 101 for insertion into soil and a connecting pipe 102 connected between the pipe 101 and the air inlet pipe 401, and a force receiving disc 1011 is fixedly arranged at the top end of the pipe 101, and a through hole 1012 is arranged in the outer wall of the pipe 101 and communicates with the inner cavity of the pipe 101.
[0050] Specifically, the bottom end of the pipe 101 is a pointed end, and the through hole 1012 is arranged at the pointed end of the pipe 101 and the outer periphery of the pipe 101.
[0051] When the pipe 101 is inserted into the soil, the pointed end helps to break the soil layer, facilitating the insertion of the pipe 101 into the soil; meanwhile, the pipe 101 can be inserted into the soil by hitting the force receiving disc 1011, further facilitating the insertion of the pipe 101 into the soil, and avoiding damage to the pipe 101 caused by hitting.
[0052] In some embodiments, referring to Figure 1 The adsorption module 20 further comprises a heat dissipation assembly, which is used for heat dissipation of the soil VOC monitoring sampling system.
[0053] In some embodiments, referring to Figure 1 The heat dissipation assembly comprises an air duct 203 and a fan 204 communicating with the air duct 203, and the fan 204 abuts against the temperature control assembly.
[0054] Specifically, the soil VOC monitoring sampling system is installed in a shell, the air duct 203 is a hollow pipe, the air outlet of the fan 204 communicates with the air duct 203, and the air outlet of the air duct 203 extends out of the shell.
[0055] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A soil VOC monitoring sample introduction system, characterized by, include: a sampling module for inserting into the soil and collecting soil gas; an adsorption module having a temperature control component for cooling and heating the soil gas; Control module; a conveying module, connected between the sampling module and the control module, and having a first channel and a second channel, wherein only the second channel is connected to the temperature control component; When the soil gas parameter to be detected is higher than a preset value, the control module closes the second channel, and the soil gas enters the control module through the first channel; when the soil gas parameter to be detected is lower than or equal to the preset value, the control module closes the first channel, and the soil gas enters the control module through the second channel.
2. The soil VOC monitoring sample injection system of claim 1, wherein, The temperature control assembly includes an adsorption chamber and a temperature regulating member. The temperature regulating member is fixed to a side wall of the adsorption chamber and is used to regulate the temperature in the adsorption chamber.
3. The soil VOC monitoring sample injection system of claim 2, wherein, A heat insulating sheet is fixedly arranged on the side wall of the adsorption chamber opposite to the temperature regulating member, and the outer periphery of the adsorption chamber is wrapped with heat-insulating cotton.
4. The soil VOC monitoring sample injection system of claim 3, wherein, The temperature regulating component is located outside the thermal insulation cotton.
5. The soil VOC monitoring sample injection system of claim 2, wherein, The adsorption chamber is filled with activated carbon.
6. The soil VOC monitoring sample injection system of claim 1, wherein, The delivery module has an air inlet pipe connected to the sampling module and a vent pipe connected between the temperature control assembly and the control module. The air inlet pipe has a first shunt pipe connected to the control module and a second shunt pipe connected to the temperature control assembly. The first shunt pipe forms the first channel, and the vent pipe and the second shunt pipe form the second channel. The temperature control assembly is connected between the vent pipe and the second shunt pipe. When the soil gas parameter to be detected is higher than a preset value, the control module closes the ventilation pipe, and the soil gas then passes through the air intake pipe and the first shunt pipe in sequence and enters the control module; when the soil gas parameter to be detected is lower than or equal to a preset value, the control module closes the first shunt pipe, and the soil gas then passes through the air intake pipe, the second shunt pipe and the air intake pipe in sequence and enters the control module.
7. The soil VOC monitoring sample injection system of claim 6, wherein, The sampling module includes an insert tube for inserting into the soil and a connecting tube communicating between the insert tube and the air inlet pipe. A force disk is fixed to the top of the insert tube, and a through hole communicating with the inner cavity of the insert tube is opened on the outer wall of the insert tube.
8. The soil VOC monitoring sample injection system of claim 7, wherein, The bottom end of the cannula is a pointed end.
9. The soil VOC monitoring sample injection system of claim 1, wherein, The adsorption module also includes a heat dissipation component, which is used to dissipate heat for the soil VOC monitoring sampling system.
10. The soil VOC monitoring sample injection system of claim 9, wherein, The heat dissipation component includes an air duct and a fan connected to the air duct; The fan abuts against the temperature control component.