CN112729973A

CN112729973A - Device for rapidly determining VOCs in soil

Info

Publication number: CN112729973A
Application number: CN202011524537.XA
Authority: CN
Inventors: 李丽华; 黎嘉雯; 刘奔; 郑丹霞; 招蔚弘; 李坚; 张小杰; 梁水仙
Original assignee: Guangdong Beiyuan Test Technology Co ltd
Current assignee: Guangdong Beiyuan Test Technology Co ltd
Priority date: 2020-12-21
Filing date: 2020-12-21
Publication date: 2021-04-30
Anticipated expiration: 2040-12-21
Also published as: CN112729973B

Abstract

The invention relates to the technical field of environmental monitoring instruments and discloses a device for rapidly determining VOCs in soil, which comprises VOCs collecting equipment, wherein the VOCs collecting equipment comprises a sleeve, a rotating rod, a driving device and a drill bit; be equipped with heating element in the drill bit, heating element sets up in the below of air inlet, and heating element includes heating body and a plurality of and this body coupling's of heating radiating fin, leaves the gap between each radiating fin. The invention improves the efficiency of heating soil, shortens the heating time, reduces the energy consumed by heating, and has the effects of energy conservation and environmental protection.

Description

Device for rapidly determining VOCs in soil

Technical Field

The invention relates to the technical field of environmental monitoring instruments, in particular to a device for rapidly determining VOCs in soil.

Background

VOCs (volatile organic compounds) refers to volatile organic compounds, and specifically to organic compounds having a saturated vapor pressure of greater than 70.91Pa at normal temperature, a boiling point of 50-260 ℃ below under a standard atmospheric pressure of 101.3kPa, and an initial boiling point of 250 ℃, or any organic solid or liquid capable of being volatilized at normal temperature and normal pressure. After the VOCs enter the soil and underground water system, the growth of crops can be influenced, vegetation can be damaged, and the health of people is seriously harmed. The quantity and speed of VOCs entering the soil exceed the capacity and purification speed of the soil, so that the properties, composition, properties and the like of the soil are changed, and the accumulation process of pollutants is gradually dominant. Therefore, volatile organic compounds in soil need to be detected by using an online VOCs monitoring system.

At present, VOCs on-line monitoring system includes VOCs collection equipment, and VOCs equipment utilizes the motor drive bull stick to rotate for during the drill bit creeps into soil, utilize the heating device on the drill bit to heat soil, make VOCs in soil volatilize, collect the VOCs content of volatilizing in VOCs gas and survey soil again. The existing heating devices are generally resistance wires, and the resistance wires are electrified to heat soil. The resistance wire sets up in the drill bit with the structure of coiling, and its thermal efficiency is lower, and the conduction effect is not good, leads to heating time long, and power consumption is big.

Disclosure of Invention

The purpose of the invention is: the utility model provides a VOCs's device in spot test soil, its efficiency that can improve heating soil shortens the heat time, has energy-concerving and environment-protective effect.

In order to achieve the above purpose, the invention provides a device for rapidly determining VOCs in soil, which comprises VOCs collecting equipment, wherein the VOCs collecting equipment comprises a sleeve, a rotating rod, a driving device and a drill bit, the sleeve is sleeved outside the rotating rod, the rotating rod rotates in the sleeve, the driving device is installed at the first end part of the sleeve, the driving device is connected with the first end part of the rotating rod, the second end part of the rotating rod is connected with the drill bit, the drill bit is rotatably connected with the second end part of the sleeve, the first end part of the sleeve is provided with an air outlet, the drill bit is provided with an air inlet, an air flow channel for allowing VOCs to flow through is formed between the rotating rod and the sleeve, one end of the air flow channel is communicated with the air outlet, and the other end of the air flow channel is communicated with the air inlet;

the soil heating drill is characterized in that a heating element for heating soil is arranged in the drill bit, the heating element is arranged below the air inlet and comprises a heating body and a plurality of radiating fins connected with the heating body, and gaps are reserved among the radiating fins.

Optionally, each of the heat dissipation fins uniformly surrounds the outside of the heating body with the axis of the heating body as the center.

Optionally, the heat dissipation fin has a first side surface and a second side surface which are arranged oppositely, the first side surface of the heat dissipation fin is provided with a plurality of first heat dissipation grooves, and the second side surface of the heat dissipation fin is provided with a plurality of second heat dissipation grooves.

Optionally, the first heat dissipation grooves are evenly distributed on the first side surface at equal intervals, and the second heat dissipation grooves are evenly distributed on the second side surface at equal intervals.

Optionally, the heating body and the heat dissipation fins are made of graphene.

Optionally, the driving device is an energy-saving motor.

Optionally, the connecting device further comprises a mounting frame, the mounting frame comprises at least three support legs and a connecting frame fixedly connected with the top ends of the support legs, the connecting frame is sleeved outside the sleeve, and a cushion pad is arranged on one surface of the connecting frame, which is in contact with the sleeve.

Optionally, the system further comprises a VOCs measuring device and a controller, wherein the VOCs measuring device is communicated with the air outlet, and the controller is electrically connected with the VOCs measuring device and the driving device respectively.

Optionally, the drill further comprises a temperature sensor disposed on the drill bit, the temperature sensor being electrically connected to the controller.

Optionally, the display device is further included, and the controller is electrically connected with the display device.

Compared with the prior art, the device for rapidly determining the VOCs in the soil provided by the invention has the beneficial effects that: the radiating fins are arranged near the heating body, so that the heat conduction efficiency of the heating element is improved, and the speed of spreading heat to soil by the heating element is increased. The heating element adopted by the invention has good heat dissipation effect, and can quickly heat the soil near the drill bit to a specified temperature; under the condition of heating soil to the same temperature, the device provided by the invention has high heating efficiency and short required heating time, and because the energy such as electric energy consumed by heating is in direct proportion to the heating time, the heating time is shortened, the energy consumed by heating is also reduced, and the effects of energy conservation and environmental protection are realized.

Drawings

FIG. 1 is a schematic diagram of an apparatus for rapid determination of VOCs in soil according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a VOCs collection apparatus according to an embodiment of the present invention;

fig. 3 is a schematic longitudinal sectional structure diagram of a VOCs collection apparatus according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a heating element according to an embodiment of the present invention.

In the figure, 1, an air inlet; 2. an air flow channel; 3. a first heat dissipation groove; 4. a second heat dissipation groove; 5. VOCs collection equipment; 51. a sleeve; 52. a rotating rod; 53. a drive device; 54. a drill bit; 6. a heating element; 61. heating the body; 62. a heat dissipating fin; 63. wrapping the sheet; 7. VOCs measuring equipment; 8. a controller; 9. a mounting frame; 91. a support leg; 92. a connecting frame; 10. a display device; 11. a temperature sensor.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the present invention, it should be understood that the terms used in the present invention are used in the description of the present invention, and it should be understood that the orientations and positional relationships indicated by the terms "center", "upper", "lower", "vertical", "top", "bottom", "inner", "outer", etc. in the present invention are based on the orientations and positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, which are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 to 4, the apparatus for rapidly determining VOCs in soil according to the preferred embodiment of the present invention includes a VOCs collecting device 5, and the VOCs collecting device 5 includes a casing 51, a rotating rod 52, a driving device 53, and a drill 54. The first end of the sleeve 51 is provided with an air outlet, which is located at the top of the sleeve 51 in the use state of the collecting device. The sleeve 51 is sleeved outside the rotating rod 52, and the rotating rod 52 can rotate in the sleeve 51. The rotating rod 52 is rotatably connected in the sleeve 51, an airflow channel 2 for VOCs gas to flow through is formed between the rotating rod 52 and the sleeve 51, and one end of the airflow channel 2 is communicated with the air outlet. The driving device 53 is installed at a first end of the sleeve 51, and the driving device 53 is connected to a first end of the rotating rod 52 for driving the rotating rod 52 to rotate. The second end of the rotating rod 52 is connected with a drill 54, and the rotating rod 52 can drive the drill 54 to rotate when rotating, so as to realize the purpose of drilling in the soil. The drill 54 is rotatably connected to the second end of the casing 51, the drill 54 is provided with an air inlet 1, and the other end of the air flow passage 2 is communicated with the air inlet 1.

It is noted that the interior of the drill 54 is provided with a heating element 6 for heating the soil, and the heating element 6 is capable of raising the temperature of the soil in the vicinity of the drill 54 so that the soil is heated to volatilize VOCs. VOCs gas volatilizes from the heated soil, enters the airflow channel 2 from the air inlet 1 and flows out from the air inlet 1. A heating element 6 is provided below the gas inlet 1 so that the VOCs collection device 5 collects the VOCs gas.

The drill 54 in this embodiment is tapered in shape, dividing the drill 54 into an upper portion, a middle portion, and a lower portion from the top. The air inlet 1 is provided at an upper portion of the drill 54, and the heating element 6 is provided at a middle portion of the drill 54, so that the heating element 6 in the present embodiment has a circular truncated cone shape as shown in fig. 3. As shown in fig. 4, the heating element 6 includes a heating body 61 and a plurality of heat radiating fins 62. The heating body 61 in this embodiment is cylindrical and is disposed at the center of the drill 54. The upper and lower ends of the heating body 61 are fixedly connected to the upper and lower portions of the drill 54, respectively. The heating element 6 in this embodiment further includes a wrapping sheet 63, the first end of the heat dissipation fin 62 is fixedly connected to the outer side of the heating body 61, and the second end of the heat dissipation fin 62 is connected to the wrapping sheet 63. The upper side of the wrapping sheet 63 is connected to the upper portion of the drill 54, and the lower side of the wrapping sheet 63 is connected to the lower portion of the drill 54. The wrapping sheet 63 prevents the drill 54 from entering the heating body 61 and the heat radiating fins 62 during drilling. Gaps are reserved among the radiating fins 62, and heat dissipation is facilitated.

Based on the above technical scheme, when VOCs needs to be detected, the drill 54 is inserted into soil, the driving device 53 is started, and the driving device 53 drives the rotating rod 52 to drive the drill 54 to rotate. Drill bit 54 drills in soil, and the heating body 61 heats the earth that is located near drill bit 54 middle part, and VOCs volatilizees from soil, and gas upwards floats to from setting up the air inlet 1 of drill bit 54 top and getting into airflow channel 2, flow from the gas outlet, in order to realize VOCs's collection, the staff of being convenient for survey VOCs. The heating body 61 generates heat, and the heat transmission is further accelerated by the heat radiating fins 62 arranged around the heating body 61, thereby improving the heat efficiency and heating rate of the heating element 6. Compared with the existing heating element, the VOCs collecting device can heat the soil near the drill bit 54 to a specified temperature more quickly, and shortens the heating time of the soil, thereby reducing the energy consumption and achieving the purposes of energy conservation and environmental protection.

As shown in fig. 4, each of the heat dissipating fins 62 is uniformly wound around the outside of the heating body 61 around the axis of the heating body 61, which facilitates the heating element 6 to uniformly heat the soil near the drill 54. The number of the heat dissipation fins 62 in this embodiment is eight, and the heat dissipation fins 62 are arranged at intervals of 45 ° to form a structure shaped like a Chinese character 'mi'.

Preferably, the heat sink fins 62 have first and second sides that are oppositely disposed. A plurality of first heat dissipation grooves 3 are formed in the first side faces of the heat dissipation fins 62, and a plurality of second heat dissipation grooves 4 are formed in the second side faces of the heat dissipation fins 62. The heat dissipation area can be increased by arranging the first heat dissipation grooves 3 and the second heat dissipation grooves 4, the heat dissipation efficiency of the heat dissipation fins 62 is further improved, and the heat value of the heating body 61 transmitted to the soil is improved. In this embodiment, the first heat dissipation groove 3 and the second heat dissipation groove 4 are both rectangular grooves. The first heat dissipation grooves 3 are evenly distributed on the first side face at equal intervals, and the second heat dissipation grooves 4 are evenly distributed on the second side face at equal intervals, so that the heat dissipation uniformity is further improved.

Optionally, the material of the heating body 61 and the heat dissipation fins 62 is graphene. Graphene has very good thermal conductivity. The heating body 61 and the heat dissipation fins 62 can generate heat by electrifying the graphene.

The apparatus for rapid determination of VOCs in soil in this embodiment may further comprise a power source disposed above the casing 51. The power supply is respectively electrically connected with the motor and the graphene to provide electric energy for the motor and the graphene material. A through hole for passing a power supply line is reserved in the center of the rotating rod 52, and the electric wire electrically connected with the power supply is connected with the graphene. The power supply can be provided with a switch, and the switch can be turned on or off to control whether the power supply is electrically connected with the graphene or not, so that whether the heating element 6 generates heat or not can be controlled.

In addition, the driving device 53 is an energy-saving motor. The energy-saving motor can reduce the loss of electromagnetic energy, heat energy and mechanical energy, improve the output efficiency and has very obvious energy-saving effect.

As shown in fig. 2 and 3, the device for rapidly determining VOCs in soil further comprises a mounting bracket 9, wherein the mounting bracket 9 comprises at least three support legs 91 and a connecting bracket 92 fixedly connected with the top end of each support leg 91. The legs 91 are uniformly arranged around the axis of the mounting frame 9. The number of the legs 91 in this embodiment is three. The sleeve 51 and the connecting bracket 92 are both annular in shape. The connecting frame 92 is sleeved on the outer side of the casing 51 and used for vertically fixing the casing 51 above the soil. When the working tool works, a worker does not need to carry the sleeve 51 by hands, so that the labor is saved, and the hands are liberated. A cushion is provided on the side of the connecting frame 92 that contacts the sleeve 51. The cushion pad is made of rubber, and can fix the sleeve 51 on the connecting frame 92, so that the sleeve 51 and the connecting frame 92 are connected and fastened. The driving device 53 generates a certain vibration to the VOCs collecting apparatus 5 when driving the rotation of the rotary rod 52 and the drill 54. The buffer pad has certain buffering damping effect, avoids mounting bracket 9 along with sleeve pipe 51 vibration, influences the monitoring result.

Further, the device for rapidly determining VOCs in soil further comprises a VOCs measuring device 7 and a controller 8. The VOCs measuring apparatus 7 is a gas chromatograph. VOCs measuring equipment 7 passes through the pipeline intercommunication with the gas outlet for receive the volatile VOCs that VOCs collection equipment 5 gathered, survey the content of various volatile organic compounds composition wherein. The controller 8 may be a PLC control system. The controller 8 is electrically connected to the VOCs measurement device 7. And the VOCs measuring equipment 7 feeds back the data obtained by monitoring to the controller 8 for storage and backup. The controller 8 is also electrically connected to the driving device 53 and the power supply, respectively. The controller 8 can control whether the driving device 53 drives the rotating rod 52 and the drill 54 to rotate, control whether the power supply is connected with the graphene to control whether the heating element 6 generates heat, and can also collect data measured by the VOCs measuring equipment 7.

In this embodiment, the device for rapidly determining VOCs in soil further includes an input device, which may be a keyboard. The input device is electrically connected to the controller 8. The operator can set the programs and parameters in the controller 8 via the input device. During the determination of VOCs, the operator may also manually control the turning on or off of the heating element 6, the rotation of the drill 54, etc. via the input device.

Further, the apparatus for rapidly determining VOCs in soil further comprises a temperature sensor 11 disposed on the drill head 54, the temperature sensor 11 being electrically connected to the controller 8. Temperature sensor 11 measures the temperature of the soil near drill bit 54 and feeds data back to controller 8. The controller 8 controls whether the heating element 6 continues to heat according to a set program. When the soil temperature is too high, the controller 8 controls the heating element 6 to stop heating.

More preferably, the apparatus for rapid determination of VOCs in soil further comprises a display device 10. The temperature display device 10 may be a display screen. The controller 8 is electrically connected to a display device 10. The controller 8 can transmit the temperature data fed back by the temperature sensor 11 and the content of the VOCs determined by the VOCs measuring equipment 7 to the display device 10, so that a worker can monitor the determination condition of the VOCs in real time.

The working process of the invention is as follows: when VOCs in the soil begins to be detected, the drill bit 54 is inserted into the soil, and the mounting frame 9 can stably and vertically fix the VOCs collecting device 5 on the soil. The controller 8 is controlled by the input device, and the controller 8 controls the energy-saving motor to drive the rotating rod 52 to drive the drill 54 to rotate so as to drill holes in the soil. The controller 8 controls the power supply to communicate the heating body 61 and the heat radiating fins 62, and the heating body 61 and the heat radiating fins 62 release heat to the outside to warm the soil near the drill 54. Due to the arrangement of the radiating fins 62, the temperature of the soil can be rapidly increased. The temperature sensor 11 monitors the soil temperature, and feeds back the data to the controller 8, and the controller 8 transmits the temperature data to the display device 10 for the staff to observe. When the temperature sensor 11 detects that the soil temperature reaches a preset value, the controller 8 controls the heating element 6 to stop heating. During heating by the heating element 6, VOCs gas in the soil enters the casing 51 from the inlet 1 and flows into the VOCs measuring device 7 from the outlet via the gas flow channel 2. The VOCs measuring device 7 determines the content of VOCs and feeds data back to the controller 8, and the controller 8 transmits the content of VOCs to the display device 10. After the monitoring is stopped, the controller 8 controls the driving device 53, the heating element 6, the VOCs measuring device 7, and the like to stop operating.

In summary, the embodiment of the present invention provides a device for rapidly determining VOCs in soil, in which heat dissipation fins are disposed near a heating body, so that the thermal conductivity of a heating element is improved, and the speed of heat dissipation from the heating element to soil is increased. Under the condition that the soil needs to be heated to the same temperature, the improved heating element has good heat dissipation effect, can quickly heat the soil near the drill bit to a specified temperature, has high heating efficiency and short required heating time. Because the energy such as electric energy consumed by heating is in direct proportion to the heating time, the heating time is shortened, the energy consumed by heating is inevitably reduced, and the effects of energy conservation and environmental protection are realized.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A device for rapidly determining VOCs in soil is characterized by comprising VOCs collecting equipment, wherein the VOCs collecting equipment comprises a sleeve, a rotating rod, a driving device and a drill bit, the sleeve is sleeved outside the rotating rod, the rotating rod rotates in the sleeve, the driving device is installed at a first end part of the sleeve, the driving device is connected with a first end part of the rotating rod, a second end part of the rotating rod is connected with the drill bit, the drill bit is rotatably connected with a second end part of the sleeve, an air outlet is formed at the first end part of the sleeve, an air inlet is formed in the drill bit, an air flow channel for VOCs gas to flow through is formed between the rotating rod and the sleeve, one end of the air flow channel is communicated with the air outlet, and the other end of the air flow channel is communicated with the air inlet;

2. The apparatus for rapid determination of VOCs in soil according to claim 1, wherein each of said fins is uniformly circumferentially disposed around the outside of said heating body about the axis of said heating body.

3. The apparatus according to claim 2, wherein the heat dissipating fins have a first side and a second side opposite to each other, the first side of the heat dissipating fins is provided with a plurality of first heat dissipating grooves, and the second side of the heat dissipating fins is provided with a plurality of second heat dissipating grooves.

4. The apparatus for rapid determination of VOCs in soil according to claim 3, wherein each of said first heat sink recesses are equally spaced and evenly distributed on said first side and each of said second heat sink recesses are equally spaced and evenly distributed on said second side.

5. The device for rapidly determining VOCs in soil according to any one of claims 1-4, wherein the material of the heating body and the material of the heat dissipation fins are graphene.

6. The device for rapid determination of VOCs in soil according to any of claims 1-4, wherein said drive means is an energy efficient motor.

7. The apparatus for rapid determination of VOCs in soil according to any one of claims 1-4, further comprising a mounting frame, wherein said mounting frame comprises at least three legs and a connecting frame fixedly connected to the top end of each of said legs, said connecting frame is sleeved outside said casing, and a cushion pad is disposed on the surface of said connecting frame contacting said casing.

8. The apparatus for rapid determination of VOCs in soil according to any one of claims 1 to 4, further comprising a VOCs measuring device in communication with said outlet port and a controller electrically connected to said VOCs measuring device and said driving means, respectively.

9. The apparatus for rapid determination of VOCs in soil according to claim 8, further comprising a temperature sensor disposed on said drill bit, said temperature sensor being electrically connected to said controller.

10. The apparatus for rapid determination of VOCs in soil according to claim 8, further comprising a display device, wherein said controller is electrically connected to said display device.