CN218455688U - VOCs on-line monitoring device in soil gas - Google Patents
VOCs on-line monitoring device in soil gas Download PDFInfo
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- CN218455688U CN218455688U CN202222549156.8U CN202222549156U CN218455688U CN 218455688 U CN218455688 U CN 218455688U CN 202222549156 U CN202222549156 U CN 202222549156U CN 218455688 U CN218455688 U CN 218455688U
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Abstract
The utility model discloses a VOCs on-line monitoring device in soil gas, include: the probe is of a hollow tubular structure, the tube body is provided with a plurality of pores, and soil gas enters the conduit through the pores; one end of the guide pipe is communicated with the probe, the other end of the guide pipe is communicated with a gas analyzer, soil gas sequentially passes through a flowmeter, a negative pressure meter and a miniature suction pump along the guide pipe and enters the gas analyzer, and the gas analyzer is configured to analyze the content and concentration of VOCs in the soil gas; the data processing device is connected with the gas analyzer and is configured to acquire and store the concentration of VOCs in the soil gas in real time in the monitoring process; the control device is configured to control the micro air pump to work, and the device can be monitored in real time on line and used for a long time.
Description
Technical Field
The utility model relates to an environmental detection technical field especially relates to a VOCs on-line monitoring device in soil gas.
Background
At present, the investigation and evaluation work of the polluted plots in China mainly takes soil monitoring as the main part and is assisted with underground water monitoring, however, volatile Organic Compounds (VOCs) are easy to exist in a gas phase, and can diffuse into soil gas in the migration process, and the phenomena that the soil concentration does not exceed the standard, but obvious peculiar smell exists, or the soil gas concentration exceeds the standard and the like occur.
However, in the prior art, the concentration of the VOCs soil gas is calculated by the concentration of VOCs soil or groundwater based on the phase equilibrium assumption, but the calculated concentration of VOCs soil gas based on the phase equilibrium has a large difference from the measured data.
Therefore, it is desirable to provide a device capable of monitoring the concentration of VOCs in soil gas on-line and in real time.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a VOCs on-line monitoring device in soil gas can solve above-mentioned at least one technical problem who mentions. The specific scheme is as follows:
an online monitoring device for VOCs in soil gas, comprising: the device comprises a probe, a conduit, a flowmeter, a negative pressure meter, a miniature suction pump, a gas analyzer, a data processing device and a control device;
the probe is a hollow tubular structure, the tube body is provided with a plurality of pores, and soil gas enters the conduit through the pores;
one end of the guide pipe is communicated with the probe, the other end of the guide pipe is communicated with the gas analyzer, soil gas sequentially passes through the flowmeter, the negative pressure meter and the micro air pump along the guide pipe and enters the gas analyzer, and the gas analyzer is configured to analyze the content and concentration of VOCs in the soil gas;
the data processing device is connected with the gas analyzer and is configured to acquire and store the concentration of VOCs in soil gas in the monitoring process in real time;
the control device is configured to control the micro air pump to work.
As an alternative embodiment, the radial width of the probe shaft aperture is less than 2mm.
As an alternative embodiment, the probe is a slotted tube made of stainless steel, one end of the slotted tube is communicated with the guide tube, and the other end of the slotted tube is a free end.
As an optional embodiment, the monitoring device further comprises: and the temperature sensor is arranged outside the probe and is configured to measure the ambient temperature of the soil gas.
As an alternative embodiment, the conduit comprises at least one section of a hollow cylindrical tube made of a stainless steel material.
As an alternative embodiment, the gas analyzer adopts a combination of PID and GC-PID analysis mode, and is configured to automatically analyze the content and concentration of VOCs in the soil gas when the measured TVOC concentration in the soil gas exceeds a set upper limit value; or configured to perform automatic analysis according to a preset period.
As an alternative embodiment, the monitoring device further comprises an insulating layer, and the insulating layer wraps the outer wall of the conduit.
As an optional embodiment, the monitoring device further comprises a filtering device disposed between the probe and the flow meter, the filtering device comprising at least one filtering unit, the filtering unit comprising a corrosive gas filter element and a moisture filter element.
As an alternative embodiment, the monitoring device further comprises an alarm device, connected to the data processing device, and configured to alarm when the concentration signal of VOCs exceeds a preset threshold.
Compared with the prior art, the utility model, following technological effect has at least:
the on-line monitoring device for VOCs in soil gas provided by the utility model can monitor the concentration of pollutants on line in real time; secondly, the probe and the guide pipe are made of materials which are not easy to damage, the probe and the guide pipe can be used in soil for a long time, repeated drilling and well building are avoided, and the well building time and cost are greatly shortened; thirdly, the abnormal condition of the concentration of the pollutants is found in time through an alarm device, and the leakage of the VOCs is early warned; fourthly, the pollution degree of the land can be directly judged according to the soil gas monitoring data, and the pollution condition of soil and underground water, the environmental risk and the change trend thereof are indicated.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
fig. 1 is a schematic structural diagram of an online monitoring device for VOCs in soil gas according to an embodiment of the present invention.
Reference numerals:
the device comprises a probe-1, a conduit-2, a flowmeter-3, a negative pressure meter-4, a micro air pump-5, a gas analyzer-6, a data processing device-7, a heat insulation layer-8, a filtering device-9 and an alarm device-10.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, 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 efforts belong to the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the embodiments of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used to describe relationships in embodiments of the invention, these terms should not be limited. These terms are only used to distinguish one relationship from another. For example, a first step may also be referred to as a second step, and similarly, a second step may also be referred to as a first step, without departing from the scope of embodiments of the present invention.
The words "if", as used herein may be interpreted as "at a time" or "when a time" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising" does not exclude the presence of other like elements in the article or device in which the element is included.
In the correlation technique, to long-term risk management and control plot and the long-term monitoring in the product enterprise, conventional soil monitoring needs drilling sampling many times, wastes time and energy, and present soil gas sampling equipment of china does not have online real-time supervision function at present, can't monitor pollutant concentration for a long time to early warning VOCs's leakage, the utility model provides a pair of VOCs on-line monitoring device in soil gas can solve above-mentioned technical problem.
The following describes in detail alternative embodiments of the present invention with reference to the accompanying drawings.
Specifically, as shown in fig. 1, the figure shows a schematic structural diagram of an online monitoring device for VOCs in soil gas. The online monitoring device comprises: a probe 1, a conduit 2, a flow meter 3, a negative pressure meter 4, a micro-pump 5, a gas analyzer 6, a data processing device 7, and a control device (not shown);
the probe 1 is a hollow tubular structure, and the tube body is provided with a plurality of pores and is configured to enable soil gas to enter the conduit through the pores;
one end of the conduit 2 is configured as an air inlet end, the other end of the conduit is communicated with the gas analyzer 6, soil gas sequentially passes through the flowmeter 3, the negative pressure gauge 4 and the micro air pump 5 to enter the gas analyzer 6, and the gas analyzer 6 is configured to analyze the content and concentration of VOCs in the soil gas;
the data processing device 7 is connected with the gas analyzer 6 and is configured to acquire and store the concentration of VOCs in the soil gas in the monitoring process in real time;
the control device is configured to control the micro air pump 5 to pump the soil gas in real time.
Wherein, the concrete structure of probe 1 is not limited, only need ensure that soil gas can pass through the probe gets into the pipe can. Optionally, the probe 1 is a hollow cylinder structure. In this embodiment, the probe 1 is a slit tube made of stainless steel, a plurality of pores on the surface of the slit tube are uniformly distributed, one end of the slit tube is communicated with the conduit 2, and the other end of the slit tube is a free end. In practical application, the probe 1 is completely inserted into the soil, and fully sucks soil gas.
The probe 1 is made of a material which is not easily damaged, such as a material which has high strength, is corrosion-resistant, is high-temperature resistant, and the like. Optionally, the probe 1 is made of stainless steel, and the stainless steel can ensure that the probe is used in an underground environment for a long time and is not easy to damage.
Optionally, the radial width in 1 hole of probe is less than 2mm, through setting up in the radial width in hole can make soil gas pass through smoothly and get into pipe 2, and large granule impurity can't get into pipe 2 through the hole in the soil simultaneously. Wherein the radial width of the aperture refers to the slot width of the aperture. Optionally, the axial length of the probe 1 is less than 20 cm, so that the probe is not easy to damage while ensuring gas entry.
As an alternative embodiment, the probe 1 may be a part of the conduit, and specifically, a plurality of evenly distributed pores are provided at the air inlet end of the conduit 2, so that no additional probe is required, the number of components is reduced, and the device is simplified.
As an alternative embodiment, the monitoring device further comprises: a temperature sensor (not shown) disposed outside the probe and configured to measure a temperature around the soil gas.
As an alternative embodiment, the monitoring device further comprises: and the heat insulation layer 8, wherein the heat insulation layer 8 is wrapped outside the guide pipe 2. The number of layers of the heat insulation layer 8 is not limited, the heat insulation layer 8 can reduce the temperature influence of the outside on VOCs gas in soil gas, and meanwhile, the guide pipe 2 is protected from erosion and damage of the external environment.
It can be understood, the utility model discloses in probe 1 can be placed in soil for a long time with the long service life of pipe 2, therefore to same monitoring point, need not all drill a well again at every turn, only need once drill a well and transfer probe and partial pipe and can monitor for a long time.
The flowmeter 3 is arranged between the probe 1 and the negative pressure gauge 4 and is used for measuring the soil gas flow in the guide pipe 2. The type of the flow meter 3 is not limited, and may be a differential pressure type flow meter, a rotor flow meter, or the like.
The negative pressure meter 4 is arranged between the flowmeter 3 and the micro air pump 5 and is used for displaying the pressure of the soil air flowing in the conduit 2 in real time.
The micro air pump 5 is arranged between the negative pressure meter 4 and the gas analyzer 6. The working mode of the miniature air pump comprises the following steps: the soil gas is in a working state in real time, and the micro air pump pumps the soil gas into the gas analyzer 6; or when the soil gas flow is small and the gas analyzer cannot analyze the concentration, starting the micro extraction pump to start working.
The gas analyzer 6 adopts a PID and/or GC-PID combined analysis mode, the PID can detect volatile organic compounds with extremely low concentration, and the GC-PID can detect and identify trace volatile organic compounds. Preferably, the gas analyzer 6 adopts a mode of using two instruments together, the errors and the accuracies of the two instruments are different, and the measurement accuracy can be improved through the sharing. The gas analyzer 6 operates in a manner that includes: when the measured TVOC concentration in the soil gas exceeds a set upper limit value, the contents and the concentrations of VOCs in the soil gas are automatically analyzed; or automatically analyzed according to a preset period. It can be understood that the gas analyzer does not need to perform analysis in real time, but only needs to perform analysis when the concentration of all organic matters (TVOC) in the soil gas reaches an upper limit value; or the soil gas is analyzed regularly, so that the performance waste is avoided. In this embodiment, the gas analyzer may be a gas chromatograph.
It should be noted that the concentration of VOCS may vary according to different conditions, such as temperature, flow rate, or pressure. The gas analyzer analyzes the concentration of VOCs under the condition based on the conditions of the temperature acquired by the temperature sensor in real time, the flow acquired by the flowmeter in real time, the pressure acquired by the negative pressure meter in real time and the like, and improves the concentration measurement accuracy.
As an alternative embodiment, the monitoring device further comprises a filtering device 9, the filtering device 9 is disposed between the probe 1 and the flow meter 3, the filtering device 9 comprises at least one filtering unit, and each filtering unit comprises a corrosive gas filtering core and a moisture filtering core. The corrosive gas filter element and the moisture filter element can be replaced in time according to the use condition, the filter effect is ensured, and the method is simple and convenient. The gas collected is filtered through the corrosive gas filter element and the moisture filter element, corrosive gas and moisture are filtered, the gas analyzer 6 can be prevented from being corroded and damaged, and the service life of the gas analyzer 6 and the accuracy of gas concentration monitoring data are improved.
When the monitoring device comprises the filtering device 9, the connection relationship of each component in the monitoring device is specifically as shown in fig. 1: the guide pipe comprises three sections of hollow cylindrical pipes, wherein the first section of hollow cylindrical pipe is L-shaped, one end of the first section of hollow cylindrical pipe is connected with the probe 1, the other end of the first section of hollow cylindrical pipe is connected with the input end of the filtering device 9, the second section of hollow cylindrical pipe is a straight pipe, one end of the second section of hollow cylindrical pipe is connected with the output end of the filtering device 9, the other end of the second section of hollow cylindrical pipe is connected with the air inlet of the micro air pump 5, the third section of hollow cylindrical pipe is a straight pipe, one end of the third section of hollow cylindrical pipe is connected with the air outlet of the micro air pump 5, and the other end of the third section of hollow cylindrical pipe is connected with the gas analyzer 6.
The data processing device 7 is used for automatically recording and storing all monitored data, such as flow, temperature, pressure, VOCS concentration and the like. The user can pass through the historical data of this monitoring point soil gas is inquired to data processing apparatus, directly judges the pollution degree in landmass according to historical data, instructs soil and groundwater pollution condition, environmental risk and variation tendency. The output mode of the data processing device may be in a report or report form, for example, the chromatogram and the analyzed concentration of VOCs are output to a user in a report or report form.
When the monitoring device stops working, for example, power is off, the data processing device 7 further has a power-off memory function, and data loss can be avoided.
The control means (not shown) is used to control the operation or non-operation of the micro-pump 5. Optionally, the data processing device and the control device are integrated in the same device. In this embodiment, the control device and the data processing device are integrated in a computer.
As another alternative, the monitoring device further comprises an alarm device 10, wherein the alarm device 10 is connected to the data processing device 7 and configured to alarm when the VOCs concentration signal exceeds a preset threshold.
Specifically, the alarm device 10 gives different preset threshold values in advance for different VOCs, obtains the components and concentrations of the VOCs stored in the data processing device 7 in real time, compares the concentrations of the VOCs with corresponding preset threshold values, and if the concentrations of the VOCs exceed the preset threshold values, it is determined that the concentrations of the pollutants are abnormal, and at this time, a warning is given. The alarm mode of the alarm device 10 is not limited, and optionally, the alarm device 10 may give an early warning to the monitoring staff in a sound-light or voice prompt mode, and the monitoring staff implements corresponding measures according to the early warning.
The on-line monitoring device for VOCs in soil gas provided by the embodiment can monitor the concentration of pollutants on line in real time; secondly, the device can be used for a long time, avoids repeated drilling and well building, and greatly shortens the well building time and cost; and thirdly, timely discovering the abnormal condition of pollutant concentration in the underground environment by setting an alarm device, and early warning the leakage of the VOCs. Meanwhile, the pollution degree of the land can be directly judged according to the soil gas monitoring data, and the pollution conditions of soil and underground water, environmental risks and the change trend of the environmental risks can be indicated.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and those skilled in the art can make various modifications and variations. Any modification, equivalent modification, improvement and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides a VOCs on-line monitoring device in soil gas which characterized in that includes: the device comprises a probe, a conduit, a flowmeter, a negative pressure meter, a miniature suction pump, a gas analyzer, a data processing device and a control device;
the probe is a hollow tubular structure, the tube body is provided with a plurality of pores, and soil gas enters the conduit through the pores;
one end of the guide pipe is communicated with the probe, the other end of the guide pipe is communicated with the gas analyzer, soil gas sequentially passes through the flowmeter, the negative pressure meter and the micro air pump along the guide pipe and enters the gas analyzer, and the gas analyzer is configured to analyze the content and concentration of VOCs in the soil gas;
the data processing device is connected with the gas analyzer and is configured to acquire and store the concentration of VOCs in soil gas in the monitoring process in real time;
the control device is configured to control the micro air pump to work.
2. The monitoring device of claim 1, wherein the probe shaft aperture has a radial width of less than 2mm.
3. The device of claim 2, wherein the probe is a slotted tube of stainless steel material having one end in communication with the conduit and the other end being a free end.
4. The monitoring device of claim 1, further comprising: and the temperature sensor is arranged outside the probe and is configured to measure the ambient temperature of the soil gas.
5. The monitoring device of claim 1, wherein the conduit comprises at least one length of hollow cylindrical tube made of a stainless steel material.
6. The monitoring device of claim 1, wherein: the gas analyzer adopts a PID and GC-PID combined analysis mode and is configured to automatically analyze the content and concentration of VOCs in the soil gas when the measured TVOC concentration in the soil gas exceeds a set upper limit value; or configured to perform automatic analysis according to a preset period.
7. The monitoring device of claim 1, further comprising an insulating layer that surrounds the outer wall of the conduit.
8. The monitoring device of claim 1, further comprising a filtering device disposed between the probe and a flow meter,
the filter device comprises at least one filter unit, and the filter unit comprises a corrosive gas filter element and a moisture filter element.
9. The monitoring device of claim 1, further comprising an alarm device coupled to the data processing device and configured to alarm when the VOCs concentration signal exceeds a predetermined threshold.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222549156.8U CN218455688U (en) | 2022-09-26 | 2022-09-26 | VOCs on-line monitoring device in soil gas |
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| CN202222549156.8U CN218455688U (en) | 2022-09-26 | 2022-09-26 | VOCs on-line monitoring device in soil gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117517623A (en) * | 2024-01-05 | 2024-02-06 | 上海久澄环境工程有限公司 | Intelligent control system of soil gas probe and soil gas automatic sampling method |
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2022
- 2022-09-26 CN CN202222549156.8U patent/CN218455688U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117517623A (en) * | 2024-01-05 | 2024-02-06 | 上海久澄环境工程有限公司 | Intelligent control system of soil gas probe and soil gas automatic sampling method |
| CN117517623B (en) * | 2024-01-05 | 2024-03-15 | 上海久澄环境工程有限公司 | Intelligent control system of soil gas probe and soil gas automatic sampling method |
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