A temperature-controlled digestion device for determining the organic carbon content of soil

Abstract

The utility model belongs to soil detection technical field discloses a kind of temperature control digestion device for determining soil organic carbon content.The device includes digestion main part, and digestion main part surface is embedded with digestion chamber, and digestion chamber side is connected with gas purification mechanism by collection pipeline;The inside side wall and bottom of the digestion chamber are provided with graphene heating film, the position corresponding to each test tube hole of the monitoring frame bottom is provided with monitoring module, and temperature sensor is further provided in the digestion chamber inside.Graphene heating film has excellent electric conductivity, heat conduction performance, can realize rapid heating and temperature distribution is uniform, compared with traditional heating mode, heating efficiency is increased by more than 30%.The boiling state inside test tube is objectively and quantitatively monitored by monitoring module.Gas purification mechanism uses multistage processing mode, for subsequent carbon content analysis, realizes the recycling of resources, while reducing pollution to the environment.

Description

Technical Field

[0001] This utility model relates to the field of soil testing technology, specifically a temperature-controlled digestion device for determining the organic carbon content of soil. Background Technology

[0002] Soil organic carbon is a collective term for humus, plant and animal remains, and microorganisms formed by microbial activity. Soil organic carbon testing requires reacting treated soil samples with potassium dichromate and concentrated sulfuric acid in a digestion apparatus. Soil organic carbon content is a key indicator for assessing soil fertility, ecological function, and response to climate change.

[0003] Traditional soil organic carbon testing digestion devices use oil baths or electric heating plates, but temperature control is inaccurate, easily leading to inaccurate results. In practice, they suffer from low temperature control precision, poor uniformity, cumbersome operation, high energy consumption, and significant pollution, making it difficult to meet modern demands for high-precision, high-efficiency, and environmentally friendly testing. Utility Model Content

[0004] The purpose of this invention is to provide a temperature-controlled digestion device for determining soil organic carbon content, thereby solving the problems mentioned in the background art. Traditional soil organic carbon determination digestion devices use oil baths or electric heating plates, but the temperature control is inaccurate, easily leading to result deviations. In use, they suffer from problems such as low temperature control accuracy, poor uniformity, cumbersome operation, high energy consumption, and significant pollution.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A temperature-controlled digestion device for determining soil organic carbon content includes a digestion body, a digestion chamber embedded on the surface of the digestion body, a gas purification mechanism connected to one side of the digestion chamber via a collection pipe, and a lifting component provided on the other side of the digestion chamber. The digestion chamber is equipped with graphene heating films on its internal side walls and bottom. The digestion chamber is also equipped with a test tube tray with multiple test tube holes evenly distributed on its surface. A monitoring frame is connected to the top of the test tube tray, and a monitoring module is installed at the bottom of the monitoring frame corresponding to the position of each test tube hole. A sealing cap is also connected to the top of the digestion chamber, and a temperature sensor is also installed inside the digestion chamber.

[0006] More preferably, the monitoring module includes a pressure sensor, an optical sensor, and a sound collector. The optical sensor is positioned at the center of each test tube hole at the bottom of the monitoring frame, and the pressure sensor and sound collector are symmetrically positioned on either side of the optical sensor. By objectively and quantitatively monitoring the boiling state inside the test tube using the pressure sensor, optical sensor, and sound collector, combined with precise timing, intelligent and automatic termination of heating is achieved, significantly reducing human error and the risk of over-cooking, and improving the reproducibility of results.

[0007] More preferably, the inner wall of the sterilization chamber is uniformly provided with a plurality of limiting blocks, the test tube tray is placed on the surface of the limiting blocks, a plurality of limiting grooves are uniformly provided on the outer edge of the surface of the test tube tray, and the monitoring frame is connected to the limiting grooves through a plurality of connecting rods at its bottom.

[0008] More preferably, the lifting assembly includes a rotating seat connected to the surface of the digestion body, a lifting rod rotatably connected to the center of the rotating seat surface, a hanging rod connected to the other end of the lifting rod via a rotating shaft, and hooks symmetrically arranged on the side surface of the hanging rod near the digestion chamber.

[0009] More preferably, the test tube tray and the monitoring frame are symmetrically provided with lifting lugs.

[0010] More preferably, the gas purification mechanism includes a condensation section and a filtration section. One side of the condensation section is connected to a collection pipe, and the other side of the condensation section is provided with a drain port. A filtration section is provided at the top of the condensation section, and a gas collection port is provided at the top of the filtration section.

[0011] More preferably, the filtration section includes, from bottom to top, a layer of activated carbon, a layer of 13X molecular sieve and supported copper oxide mixed filling, and a layer of sodium-based montmorillonite and quicklime mixed filling. The volume ratio of 13X molecular sieve to supported copper oxide is 2:1, and the filling is done in sections with gas distribution plates between the layers; the mass ratio of sodium-based montmorillonite to quicklime is 1:3, and a stainless steel sintered mesh is used for support between the sodium-based montmorillonite and quicklime mixed filling layer and the 13X molecular sieve and supported copper oxide mixed filling layer. Through this structure, during the digestion process, the generated carbon dioxide and nitrogen oxides (NOx) are effectively controlled. x The device contains gases such as sulfur dioxide (SO2). A built-in gas collection pipe introduces the gases produced in the reaction into a gas purification unit. The purification unit employs a three-stage adsorption structure to achieve gradient purification of harmful gases.

[0012] Compared with the prior art, the beneficial effects of this utility model are: The digestion chamber is equipped with graphene heating films on its internal side walls and bottom, completely surrounding the interior. The graphene heating films possess excellent electrical and thermal conductivity, enabling rapid heating and uniform temperature distribution, resulting in a heating efficiency increase of over 30% compared to traditional resistance wire heating methods.

[0013] By objectively and quantitatively monitoring the boiling state inside the test tube using pressure sensors, optical sensors, and sound collectors, and in conjunction with the temperature sensor inside the digestion chamber, as well as the display screen and control buttons, heating can be automatically terminated, significantly reducing human error and the risk of over-digestion, and improving the reproducibility of results.

[0014] During the digestion process, gases such as carbon dioxide and nitrogen oxides are produced. These gases are collected through pipes and introduced into a gas purification system. The gas purification system employs a multi-stage treatment method: first, water vapor is condensed and separated in a condensation section; then, harmful gases are removed using a filtration section; finally, the purified carbon dioxide is collected for subsequent carbon content analysis, achieving resource recycling and reducing environmental pollution. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the test tube tray structure of this utility model; Figure 3 This utility model Figure 1 Enlarged structural diagram at point A in the middle; In the diagram: 1. Digestion body; 2. Digestion chamber; 3. Sealing cap; 4. Graphene heating film; 5. Temperature sensor; 6. Limiting block; 7. Test tube tray; 8. Limiting groove; 9. Test tube hole; 10. Lifting lug; 11. Monitoring frame; 12. Pressure sensor; 13. Optical sensor; 14. Sound collector; 15. Connecting rod; 16. Collection pipe; 17. Gas purification mechanism; 1701. Condensation section; 1702. Filtration section; 1703. Gas collection port; 1704. Drain port; 18. Rotating seat; 19. Lifting rod; 20. Rotating shaft; 21. Lifting rod; 22. Lifting hook; 23. Display screen; 24. Control button. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figures 1-3 This utility model provides a technical solution: A temperature-controlled digestion device for determining soil organic carbon content includes a digestion body 1, a digestion chamber 2 embedded on the surface of the digestion body 1, a gas purification mechanism 17 connected to one side of the digestion chamber 2 through a collection pipe 16, and a lifting component provided on the other side of the digestion chamber 2. The inner sidewalls and bottom of the digestion chamber 2 are equipped with graphene heating films 4. The digestion chamber 2 is also equipped with a test tube tray 7. Multiple test tube holes 9 are evenly distributed on the surface of the test tube tray 7. A monitoring rack 11 is connected to the top of the test tube tray 7. A monitoring module is set at the bottom of the monitoring rack 11 corresponding to the position of each test tube hole 9. A sealing cover 3 is also connected to the top of the digestion chamber 2. A temperature sensor 5 is also installed inside the digestion chamber 2.

[0018] In this invention, the monitoring module includes a pressure sensor 12, an optical sensor 13, and a sound collector 14. The optical sensor 13 is positioned at the bottom of the monitoring frame 11, corresponding to the center of each test tube hole 9. The pressure sensor 12 and the sound collector 14 are symmetrically positioned on either side of the optical sensor 13. The pressure sensor 12 monitors minute pressure fluctuations at the test tube opening inside the test tube hole 9, i.e., the boiling characteristics at the test tube opening. The optical sensor 13 detects changes in light scattering caused by violent turbulence of the liquid surface inside the test tube within the test tube hole 9. The sound collector 14 analyzes the specific sound wave spectrum generated by the heating and boiling of the test tube inside the test tube hole 9. By objectively and quantitatively monitoring the boiling state inside the test tube using the pressure sensor 12, optical sensor 13, and sound collector 14, combined with precise timing, intelligent and automatic termination of heating is achieved, significantly reducing human error and the risk of over-boiling, and improving the reproducibility of results.

[0019] In this invention, multiple limiting blocks 6 are evenly arranged on the inner wall of the sterilization chamber 2, a test tube tray 7 is placed on the surface of the limiting blocks 6, and multiple limiting grooves 8 are evenly arranged on the outer edge of the surface of the test tube tray 7. The monitoring frame 11 is connected to the limiting grooves 8 through multiple connecting rods 15 at its bottom.

[0020] In this invention, the lifting assembly includes a rotating seat 18 connected to the surface of the digestion body 1. A lifting rod 19 is rotatably connected to the center of the rotating seat 18. A hanging rod 21 is connected to the other end of the lifting rod 19 via a rotating shaft 20. Hooks 22 are symmetrically arranged on the side of the hanging rod 21 closest to the digestion chamber 2. Lifting lugs 10 are symmetrically arranged on the surfaces of the test tube tray 7 and the monitoring frame 11. A locking assembly is also provided at the connection between the lifting rod 19 and the hanging rod 21. The locking assembly can be a locking nut, a fastening pin, or other locking structure, used to lock the hanging rod 21 and the lifting rod 19 after the hanging rod 21 rotates around the rotating shaft 20 to a certain angle. The hooks 22 can be connected to the side of the hanging rod 21 closest to the digestion chamber 2 via ropes of different lengths or other structures. The distance between the two hooks 22 can also be adjusted at the bottom of the hanging rod 21 according to the diameter of the digestion chamber 2, such as through the interaction of a sliding groove and a slider.

[0021] In this invention, the gas purification mechanism 17 includes a condensation section 1701 and a filtration section 1702. One side of the condensation section 1701 is connected to a collection pipe 16, and the other side has a drain port 1704. The filtration section 1702 is located at the top of the condensation section 1701, and a gas collection port 1703 is located at the top of the filtration section 1702. The filtration section 1702 internally includes, from bottom to top, a layer of activated carbon, a layer of 13X molecular sieve and supported copper oxide mixed filling, and a layer of sodium-based montmorillonite and quicklime mixed filling. The volume ratio of 13X molecular sieve to supported copper oxide is 2:1, and the filling is done in sections with gas distribution plates between the layers. The mass ratio of sodium-based montmorillonite to quicklime is 1:3, and a stainless steel sintered mesh support is provided between the sodium-based montmorillonite and quicklime mixed filling layer and the 13X molecular sieve and supported copper oxide mixed filling layer. Through the above structure, during the digestion process, the generated carbon dioxide and nitrogen oxides (NOx) are effectively purified. x Gases such as sulfur dioxide (SO2) are collected through collection pipe 16 and introduced into gas purification unit 17. Gas purification unit 17 adopts a three-stage adsorption structure to achieve gradient purification of harmful gases.

[0022] In this invention, a display screen 23 and a control button 24 are also provided on one side surface of the cooking body 1. The display screen 23 is used to display real-time data monitored by the temperature sensor 5, pressure sensor 12, optical sensor 13 and sound collector 14, while the control button 24 is used to control the switching on and off of the graphene heating film 4 and other equipment.

[0023] Example: In use, first determine the number of test tubes needed to test the required number of soil samples, and replace the test tube tray 7 with the corresponding test tube holes 9 according to the number of test tubes. Only enough test tube holes 9 on the surface of the test tube tray 7 are needed to avoid having multiple unused test tube holes 9. Then, accurately place the quantitative amount of soil sample into the test tubes and add the corresponding digestion reagent. Place the test tube tray 7 on the limiting block 6 inside the digestion chamber 2. Next, install the monitoring frame 11 through the limiting groove 8 and connecting rod 15, ensuring that the monitoring module at the bottom of the monitoring frame 11 is aligned with each test tube opening, and then cover it with the sealing cap 3. Then turn on the device switch. The digestion chamber 2 is heated by the graphene heating film 4 set on the inner side wall and bottom of the digestion chamber 2. Set the digestion temperature and time parameters on the display screen 23 to quickly raise the temperature of the digestion chamber 2 to the set value and maintain it constant. During the digestion process, the temperature sensor 5 monitors the temperature in real time to ensure that the digestion reaction takes place under optimal conditions. Simultaneously, the boiling state inside the test tube is objectively and quantitatively monitored by pressure sensor 12, optical sensor 13, and sound collector 14. Combined with precise timing, intelligent and automatic termination of heating is achieved, significantly reducing human error and the risk of over-cooking, and improving the reproducibility of results. The gas produced in the reaction is introduced into the gas purification mechanism 17 through collection pipe 16. The gas purification mechanism 17 adopts a three-stage adsorption structure to achieve gradient purification of harmful gases, and the purified gas is collected uniformly through gas collection port 1703. The generated condensate is discharged uniformly through the drain port 1704 on the bottom side.

[0024] After the digestion is completed, the sealing cover 3 is opened, and the monitoring frame 11 and test tube tray 7 are taken out in sequence by means of the lifting assembly, the lifting rod 19, the hanging rod 21 and the hook 22. Finally, the digestion chamber 2 embedded in the digestion body 1 is removed, and the digestion chamber 2, test tube tray 7, test tubes and monitoring frame 11 are cleaned to prepare for the next experiment.

[0025] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0026] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A temperature-controlled digestion device for determining soil organic carbon content, comprising a digestion body (1), characterized in that: The surface of the digestion body (1) is embedded with a digestion chamber (2), and a gas purification mechanism (17) is connected to one side of the digestion chamber (2) through a collection pipe (16). A lifting component is provided on the other side of the digestion chamber (2). The inner sidewalls and bottom of the digestion chamber (2) are provided with graphene heating film (4). The digestion chamber (2) is also provided with test tube tray (7). Multiple test tube holes (9) are evenly arranged on the surface of the test tube tray (7). A monitoring rack (11) is also connected to the top of the test tube tray (7). A monitoring module is provided at the bottom of the monitoring rack (11) corresponding to the position of each test tube hole (9). A sealing cap (3) is also connected to the top of the digestion chamber (2). A temperature sensor (5) is also provided inside the digestion chamber (2).

2. The temperature-controlled digestion device for determining soil organic carbon content according to claim 1, characterized in that: The monitoring module includes a pressure sensor (12), an optical sensor (13) and a sound collector (14). The optical sensor (13) is located at the center of each test tube hole (9) at the bottom of the monitoring frame (11). The pressure sensor (12) and the sound collector (14) are symmetrically arranged on both sides of the optical sensor (13).

3. The temperature-controlled digestion device for determining soil organic carbon content according to claim 1, characterized in that: The inner wall of the sterilization chamber (2) is uniformly provided with multiple limiting blocks (6), the test tube tray (7) is placed on the surface of the limiting blocks (6), and multiple limiting grooves (8) are uniformly provided on the outer edge of the surface of the test tube tray (7). The monitoring frame (11) is connected to the limiting grooves (8) through multiple connecting rods (15) at its bottom.

4. The temperature-controlled digestion device for determining soil organic carbon content according to claim 1, characterized in that: The lifting assembly includes a rotating seat (18) connected to the surface of the digestion body (1). A lifting rod (19) is rotatably connected to the center of the surface of the rotating seat (18). A hanging rod (21) is connected to the other end of the lifting rod (19) through a rotating shaft (20). Hooks (22) are symmetrically arranged on the side surface of the hanging rod (21) near the digestion chamber (2).

5. The temperature-controlled digestion device for determining soil organic carbon content according to claim 4, characterized in that: The test tube tray (7) and the monitoring frame (11) are both symmetrically provided with lifting lugs (10).

6. The temperature-controlled digestion device for determining soil organic carbon content according to claim 1, characterized in that: The gas purification mechanism (17) includes a condensing section (1701) and a filtering section (1702). One side of the condensing section (1701) is connected to the collection pipe (16), and the other side of the condensing section (1701) is provided with a drain port (1704). The top of the condensing section (1701) is provided with a filtering section (1702), and the top of the filtering section (1702) is provided with a gas collection port (1703).

7. The temperature-controlled digestion apparatus for determining soil organic carbon content according to claim 6, characterized in that: The filter section (1702) includes, from bottom to top, a layer of activated carbon, a layer of 13X molecular sieve and supported copper oxide mixed filling, and a layer of sodium montmorillonite and quicklime mixed filling.

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