Device for capturing soil release gas

Abstract

The utility model provides a device for capturing gas released from soil, which comprises a container with soil, a gas capturing unit and a gas flow control unit which are connected in sequence, the container is of a sealed structure, a chemical solution is arranged in the gas capture unit, the gas capture unit collects gas released by soil to be detected from the top of the container, and the chemical solution absorbs gas needing to be detected in the gas released by the soil to be detected; one end of the gas flow control unit is connected with the gas capturing unit, the other end of the gas flow control unit is connected with the container, the gas flow in the gas capturing unit is controlled and adjusted, meanwhile, gas flowing out of the gas capturing unit is fed into the bottom of the container, the gas flows back into soil, and the soil in the container is in a vertical pressure balance state; through the structure, the problems that the capture technology of the carbon dioxide gas in the soil is low in efficiency, and an effective device for capturing and detecting the carbon dioxide released by the soil is lacked are solved.

Description

Technical Field

[0001] This utility model relates to the technical field of soil gas capture devices, and more specifically, to a device for capturing gases released from soil. Background Technology

[0002] Carbon dioxide is one of the main gaseous components released from soil and a significant source or reservoir of major greenhouse gases in the atmosphere. Soil carbon dioxide flux, as an important measure of greenhouse gas exchange between land and the atmosphere, reflects the physical, chemical, and biological properties of soil, as well as human activities related to land use, underground mineral resources, and karst topography. Due to its significant contribution to and impact on global climate change, it has attracted considerable attention and importance from countries worldwide.

[0003] Soil is both a "carbon source" and a "carbon sink." Soil organic carbon is the main carbon pool of terrestrial ecosystems. However, current technologies for capturing carbon dioxide in soil mostly rely on natural processes, which are inefficient and lack effective devices to capture gases released from the soil and subsequently detect carbon dioxide content.

[0004] Therefore, there is an urgent need for a device to capture gases released from the soil and solve the aforementioned problems. Utility Model Content

[0005] In view of the above problems, the present invention provides a device for capturing gases released from soil, which enables it to capture gases released from soil and accurately detect the carbon dioxide content in the gases.

[0006] To achieve the above objectives, this utility model provides a device for capturing gases released from soil, comprising:

[0007] It has a soil container, a gas capture unit, and a gas flow control unit, which are connected in sequence;

[0008] The container is a sealed structure used to hold the soil to be tested;

[0009] The gas capture unit contains a chemical solution. The gas capture unit collects the gas released from the soil to be tested from the top of the container. The gas released from the soil to be tested from the top of the container enters the gas capture unit and comes into full contact with the chemical solution. The chemical solution is used to absorb the gas to be detected from the gas released from the soil to be tested.

[0010] The gas flow control unit is connected with the gas capturing unit at one end and connected with the container at the other end, for controlling and adjusting the gas flow in the gas capturing unit, and sending the gas flowing out of the gas capturing unit into the bottom of the container, and returning the gas to the soil, so that the soil in the container is in the state of upper and lower pressure balance, and the gas circulation of the whole system is realized.

[0011] As a further scheme of the utility model: the container comprises:

[0012] The device main body and the top cover, the top of the soil in the device main body and the top cover form a closed respiration darkroom, the respiration darkroom is used for simulating the natural respiration process of the soil and accumulating the gas released by the soil;

[0013] The top cover is provided with a through hole, and the respiration darkroom and the gas capturing unit are communicated through the through hole, so that the gas released by the soil enters the gas capturing unit.

[0014] As a further scheme of the utility model: the container further comprises: a return pipe, the return pipe is communicated with the bottom side of the device main body, and the gas inlet end of the return pipe is communicated with the gas flow control unit.

[0015] As a further scheme of the utility model: further comprising: an air pipe;

[0016] The container, the gas capturing unit and the gas flow control unit are connected through the air pipe.

[0017] As a further scheme of the utility model: the gas flow control unit comprises:

[0018] A pump gas system is arranged downstream of the gas capturing unit, for receiving the gas in the gas capturing unit and pumping;

[0019] A gas flow control valve is arranged downstream of the pump gas system and communicated with the container.

[0020] As a further scheme of the utility model: the upstream and downstream of the gas capturing unit are respectively connected with a first water removal device and a second water removal device, the first water removal device is respectively communicated with the container and the gas capturing unit through the air pipe, and the second water removal device is respectively communicated with the gas capturing unit and the pump gas system through the air pipe.

[0021] As a further scheme of the utility model: the first water removal device is provided with a vertical first gas inlet long pipe and a first gas outlet short pipe, the first gas inlet long pipe is communicated with the container through the air pipe, and the first gas outlet short pipe is communicated with the gas capturing unit through the air pipe.

[0022] As a further scheme of the utility model: the second water removal device is internally provided with a vertical second air inlet long pipe and a second air outlet short pipe, the second air inlet long pipe is communicated with the gas capturing unit through an air pipe, and the second air outlet short pipe is communicated with the pump air system through an air pipe.

[0023] As a further scheme of the utility model: the gas capturing unit comprises:

[0024] The gas capturing bottle with chemical solution is provided with a cover body at the top of the gas capturing bottle, the cover body is provided with a vertical gas capturing long pipe and a gas discharge short pipe, the gas capturing long pipe extends into the chemical solution to discharge gas, and the gas discharge short pipe is communicated with the second water removal device.

[0025] As a further scheme of the utility model: the bottom of the gas capturing long pipe is provided with a bubble stone, and the bubble stone is used to uniformly send gas into the chemical solution.

[0026] As a further scheme of the utility model: the pump air system is a diaphragm pump, and the air pipe is a Teflon pipe.

[0027] The utility model discloses a technical effect:

[0028] 1, the application is through the containing vessel, gas capturing unit and gas flow control unit, through the air pipe is connected respectively, to let the soil gas in the containing vessel, from the air outlet end of the top of containing vessel, and then flows back through the air inlet end of the bottom of containing vessel, realizes the stable circulation from top to bottom, reaches under the condition of not affecting the water content of soil, captures the gas in the containing vessel to the gas capturing unit and carries out the gas detection of gas capturing unit;

[0029] 2, the application is through the gas generated by the containing vessel, captures to the gas capturing unit, and the captured gas reacts with the chemical solution in the gas capturing unit, produces stable measurable material, carries out the detection to the measurable material, reaches the effect of detecting the carbon dioxide content in the soil gas;

[0030] 3, the application is through setting up water removal device on the upstream and downstream of gas capturing unit respectively and removing the water carried by gas, prevents water from entering chemical agent, and also prevents water from entering the pump air system, to guarantee the accuracy of detection result. BRIEF DESCRIPTION OF DRAWINGS

[0031] The accompanying drawings are used to provide further understanding of the utility model, and constitute a part of the specification, are used to explain the utility model together with the embodiments of the utility model, and do not constitute the limitation to the utility model.In the drawings:

[0032] Figure 1 It is the whole structure schematic view of the device for capturing soil released gas of the utility model.

[0033] Figure 2 is the structure diagram of the containing device in the utility model.

[0034] The reference signs in the drawings are:

[0035] 1, containing device; 11, device main body; 12, top cover; 121, through hole; 13, backflow pipe; 2, air pipe; 3, gas capturing unit; 31, gas capturing bottle; 32, cover body; 33, gas capturing long pipe; 331, bubble stone; 34, gas discharge short pipe; 301, first water removal device; 3011, first air inlet long pipe; 3012, first air outlet short pipe; 302, second water removal device; 3021, second air inlet long pipe; 3022, second air outlet short pipe; 4, pump air system; 5, gas flow control valve; 6, gas flow control unit; 7, breathing darkroom. DETAILED DESCRIPTION

[0036] In the following description, certain exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the utility model. Therefore, the drawings and the description are considered to be exemplary in nature rather than limiting.

[0037] The preferred embodiments of the utility model are described below in conjunction with the drawings, and it should be understood that the preferred embodiments described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model.

[0038] Please see Figure 1 A specific embodiment of a device for capturing soil released gas is shown in the drawings, which can be used to capture soil released gas, collect gas in the soil gas accurately, and detect the content of carbon dioxide gas released by the soil without affecting the water content of the soil.

[0039] As Figure 1 shown, a device for capturing soil released gas includes a containing device 1 with soil, a gas capturing unit 3, and a gas flow control unit 6, which are connected in sequence; the containing device 1 is a sealed structure for containing the soil to be detected; the gas capturing unit 3 is provided with a chemical solution, and the gas capturing unit 3 collects the gas released by the soil to be detected from the top of the containing device 1, the gas released by the soil to be detected at the top of the containing device 1 enters the gas capturing unit 3 and fully contacts with the chemical solution, and the chemical solution is used to absorb the gas to be detected in the gas released by the soil to be detected;

[0040] The gas flow control unit 6 is connected to the gas capturing unit 3 at one end and to the container 1 at the other end, for controlling and regulating the flow of gas in the gas capturing unit 3, and for sending the gas flowing out of the gas capturing unit 3 to the bottom of the container 1, so that the gas flows back into the soil, and the soil in the container 1 is in a state of pressure balance from top to bottom.

[0041] Specifically, the container 1 is filled with soil, and water can be injected into the container. By controlling the amount of water injected, the soil in the container can be in any water level condition. The container is sealed as a whole with a gas outlet and a gas inlet. The gas capturing unit 3 is arranged on one side of the container 1 and is connected to the top gas inlet of the container 1. The gas capturing unit 3 is used to capture the gas in the container 1 and to convert the gas into stable measurable substances by chemical reaction with the chemical solution in the gas capturing unit 3. The carbon dioxide content in the gas is detected. The gas flow control unit 6 is arranged downstream of the gas capturing unit 3 and is connected to the bottom gas inlet of the container 1. The gas flow control unit 6 is used to receive the gas in the gas capturing unit 3 and to control the flow of the gas, and to deliver the gas to the container 1.

[0042] It can be understood that, as shown in Figure 1 The device for capturing soil released gas further comprises an air pipe, which is provided with a plurality of air passages respectively connected to the container, the gas capturing unit and the gas flow control unit, forming a gas circulation channel. The air pipe 2 is connected to the gas capturing unit 3 and the gas flow control unit 6, for circulating and transmitting the gas in the container 1 from top to bottom in sequence, from the gas capturing unit 3 to the gas flow control unit 6 and then to the container 1, without forming reverse pressure. The soil can be captured in any water level condition.

[0043] Specifically, the gas flow control unit 6 comprises a gas pumping system 4 arranged downstream of the gas capturing unit 3, for receiving the gas in the gas capturing unit 3 and pumping the gas. A gas flow control valve 5 is arranged downstream of the gas pumping system 4 and is connected to the container 1. The gas in the container 1 enters the gas capturing unit 3 from the top through the air pipe 2. The gas pumping system 4 pumps the gas to the gas flow control valve 5. The gas flow control valve 5 adjusts the flow of the gas and then delivers the gas into the container 1.

[0044] Without affecting the water content of the soil, the gas released by the soil is transmitted from the top of the container 1 to the gas capturing unit 3, and is adsorbed by the chemical solution in the gas capturing unit 3. The gas released by the soil reacts with the solution to convert it into stable measurable substances. By detecting the measurable substances, the carbon dioxide content in the soil gas is detected. The gas flow control valve 5 displays the gas flow in real time, providing stable gas flow control. The gas pumping system 4 provides stable circulation of the gas from top to bottom for the entire device for capturing soil released gas.

[0045] Specifically, such as Figure 2 As shown, the container 1 includes a main body 11 and a top cover 12. A sealed breathing chamber 7 is formed between the top of the soil inside the main body 11 and the top cover 12. The breathing chamber 7 is used to simulate the natural breathing process of the soil and accumulate the gas released by the soil. A through hole 121 is provided on the top cover 12. The breathing chamber 7 is connected to the gas capture unit 3 through the through hole 121, so that the gas released by the soil enters the gas capture unit 3.

[0046] Understandably, the respiration chamber 7 is a relatively sealed space formed between the soil and the top cover in container 1. This prevents outside airflow from diluting the gases released from the soil, allowing the gases to accumulate within the chamber. This facilitates subsequent sampling and analysis, helps control environmental factors such as temperature and humidity, and reduces the interference of natural fluctuations on the measurement results. Furthermore, the respiration chamber 7 can be made of opaque materials to block light and inhibit photosynthesis, ensuring that the collected gases originate from soil respiration. Additionally, before sealing, continuous plant growth can be carried out in the respiration chamber. Plant growth causes changes in soil carbon emissions, facilitating the capture of soil gas emissions caused by plant growth later. The respiration chamber is cylindrical, with dimensions of 15cm in diameter and 40cm in height. The size of the respiration chamber can be adjusted according to the soil volume. The size of the respiration chamber affects the soil's capacity, further influencing the calculation of soil gas release, but not the experimental results. However, if plant growth is carried out beforehand, the size of the respiration chamber will affect root extension, further impacting the experimental results. Therefore, the size of the respiration chamber can be selected based on whether plant growth is conducted.

[0047] Furthermore, the container 1 also includes a return pipe 13, which is connected to the bottom side of the main body 11 of the device. The air inlet of the return pipe 13 is connected to the gas flow control unit 6. The container 1 contains water. By connecting the return pipe 13 to the bottom of the container 1, water can enter the return pipe 13. The return pipe 13 is connected to the gas flow control unit 6, which can effectively prevent water from entering the gas flow control unit 6.

[0048] Understandably, the container 1 can hold soil samples with any moisture content. Preferably, the main body 11 of the device is configured as a cylinder, forming a sealed breathing chamber between the cylinder and the top cover 12. The soil containing water releases gas in the breathing chamber and exits through the through hole 121 on the top cover 12. The through hole 121 is connected to the ventilation pipe 2 to conduct the gas to the gas capture unit 3. The gas capture unit 3 detects the carbon dioxide content in the gas and, under the control of the pumping system 4 and the gas flow control valve 5, directs the gas through the return pipe 13 on the bottom side of the main body 11 to return the gas to the container 1, so as to carry out a top-down gas circulation without creating reverse pressure. Soil gas can be captured under any water level conditions.

[0049] Preferably, the upstream and downstream of the gas capture unit 3 are respectively connected to a first dewatering device 301 and a second dewatering device 302. The first dewatering device 301 is connected to the container 1 and the gas capture unit 3 through the vent pipe 2, and the second dewatering device 302 is connected to the gas capture unit 3 and the pumping system 4 through the vent pipe 2.

[0050] Specifically, the first dewatering device 301 is provided with a vertical first air inlet long pipe 3011 and a first air outlet short pipe 3012. The first air inlet long pipe 3011 is connected to the container 1 through the vent pipe 2, and the first air outlet short pipe 3012 is connected to the gas capture unit 3 through the vent pipe 2.

[0051] Specifically, the second dewatering device 302 is equipped with a vertical second long air inlet pipe 3021 and a second short air outlet pipe 3022. The second long air inlet pipe 3021 is connected to the gas capture unit 3 through the vent pipe 2, and the second short air outlet pipe 3022 is connected to the pumping system 4 through the vent pipe 2. Water and gas are separated by the first dewatering device 301 and the second dewatering device 302 to prevent water from entering the gas capture unit 3 and ensure the accuracy of the detection results. After the gas is detected by the gas capture unit 3, it passes through the second dewatering device 302 to prevent water and soil from entering the pumping system 4.

[0052] like Figure 1 As shown, the gas capture unit 3 includes a gas capture bottle 31 containing a chemical solution, a cover 32 disposed on the top of the gas capture bottle 31, the cover 32 having a vertical gas capture long tube 33 and a gas discharge short tube 34, the gas capture long tube 33 extending into the chemical solution to discharge gas, and the gas discharge short tube 34 being connected to a second dehydration device 302, the gas capture bottle 31 containing a chemical solution, such as nitrogen hydroxide solution, used to adsorb and fix gases in the soil, the soil gases react chemically with the solution to convert them into stable measurable substances, the gas capture bottle 31 having a first dehydration device 301 and a second dehydration device 302 on both sides to prevent water from entering the chemical solution and the gas pumping system 4 inside the gas capture bottle 31.

[0053] It should be noted that the bottom of the gas capturing long pipe 33 is provided with sterilized bubble stones 331, the gas is uniformly sent into the chemical solution through the bubble stones 331, the pump gas system 4 is a diaphragm pump, the breather pipe 2 is a Teflon pipe, the Teflon pipe is transparent and has certain hardness, and can be bent, which is beneficial to the capture of soil gas, and the pipe wall adsorption is not formed due to pressure during the gas transmission.

[0054] Although the foregoing disclosure shows exemplary embodiments of the present application, it should be noted that various changes and modifications can be made without departing from the scope defined by the claims. Furthermore, although elements of the present application can be described or claimed in individual form, alternatives having a plurality of elements can be contemplated unless expressly limited to a single element.

[0055] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still can be modified to the technical scheme recorded in the foregoing embodiments, or equivalent replacement for part of the technical features. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A device for capturing soil emitted gases, characterized in that, The application relates to a soil respiration detection device. The device comprises a container for soil, a gas capturing unit and a gas flow control unit, which are connected in sequence. The container is a sealed structure for containing the soil to be detected. The gas capturing unit is provided with a chemical solution, and the gas capturing unit collects the gas released by the soil to be detected from the top of the container. The top of the container collects the gas released by the soil to be detected and the gas enters the gas capturing unit and fully contacts with the chemical solution.

2. The apparatus for capturing soil emitted gas of claim 1, wherein, The gas flow control unit is connected with the gas capturing unit at one end and connected with the container at the other end. The gas flow control unit controls and adjusts the gas flow in the gas capturing unit and sends the gas out of the gas capturing unit into the bottom of the container. The container comprises a device body and a top cover.

3. The apparatus for capturing soil emitted gas of claim 1, wherein, A closed respiration dark chamber is formed between the top of the soil in the device body and the top cover.

4. The apparatus for capturing soil emitted gas of claim 1, wherein, The respiration dark chamber is used for simulating the natural respiration process of the soil and accumulating the gas released by the soil. A through hole is formed in the top cover. The respiration dark chamber and the gas capturing unit are connected through the through hole, so that the gas released by the soil enters the gas capturing unit.

5. The apparatus for capturing soil emitted gas of claim 4, wherein, The container further comprises a backflow pipe connected with the bottom side of the device body. The gas inlet end of the backflow pipe is connected with the gas flow control unit. The device further comprises a ventilation pipe.

6. The apparatus for capturing soil emitted gas of claim 5, wherein, The container, the gas capturing unit and the gas flow control unit are connected through the ventilation pipe.

7. The apparatus for capturing soil emitted gas of claim 6, wherein, The gas flow control unit comprises a pump system arranged downstream of the gas capturing unit for receiving the gas in the gas capturing unit and pumping.

8. The apparatus for capturing soil emitted gas of claim 6, wherein, A gas flow control valve is arranged downstream of the pump system and connected with the container.

9. The apparatus for capturing soil emitted gas of claim 6, wherein, First and second water removal devices are respectively arranged upstream and downstream of the gas capturing unit. The first water removal device is connected with the container and the gas capturing unit through the ventilation pipe. The second water removal device is connected with the gas capturing unit and the pump system through the ventilation pipe. The gas capturing unit comprises a gas capturing bottle provided with a chemical solution. A cover is arranged at the top of the gas capturing bottle. The cover is provided with a vertical gas capturing long pipe and a gas discharge short pipe. The gas capturing long pipe extends into the chemical solution to guide the gas. The gas discharge short pipe is connected with the second water removal device.

10. The apparatus for capturing soil emitted gas of claim 9, wherein, The bottom of the gas capturing long tube is provided with air stone, through which the gas is uniformly sent into the chemical solution.

11. The apparatus for capturing soil emitted gas of claim 5, wherein, The pump system is a membrane pump, and the air pipe is a Teflon pipe.

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