CN111610309A - Device for testing gas adsorption capacity and oxidation efficiency of soil body with controllable soil body external load - Google Patents
Device for testing gas adsorption capacity and oxidation efficiency of soil body with controllable soil body external load Download PDFInfo
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Abstract
The invention discloses a device for testing gas adsorption capacity and oxidation efficiency of a soil body capable of controlling external load of the soil body. The device comprises a bottom support, a sample chamber, a displacement sensor, a suction control system, a gas supply system to be detected, a gas detection system, a safety guide and exhaust system, a gas circulation system, a reaction frame loading system and a load sensor. The method comprises the steps of controlling soil body suction through a suction control system, applying external load through a reaction frame and a loading rod, detecting internal stress change of a soil sample through a load sensor, introducing quantitative greenhouse gas to be detected into a device through a gas supply device, detecting the gas after adsorption and oxidation in real time through a gas detection system, performing suction on different modified soil samples and soil samples containing microorganisms, researching soil body adsorption and oxidizing gas efficiency and internal stress influence rules during load change, and obtaining a landfill gas concentration change rule during the service period of a landfill. The experimental device has the advantages of simple and light design, convenient operation, good integration performance and wide application.
Description
Technical Field
The invention relates to a device for testing the gas adsorption capacity and the oxidation efficiency of a soil body with controllable soil body external load, belonging to the field of manufacturing technology and testing of geotechnical environment engineering measuring instruments.
Background
With the accelerated development of industrialization and urbanization processes, about 1/3 cities are deeply sinking into the city of trash enclosure. The urban domestic garbage brings heavy pressure to the urban and surrounding ecological environment. At present, domestic garbage treatment modes in China mainly include incineration, composting and landfill, and about four fifths of the existing garbage treatment modes are landfill. The gas in the landfill yard is released in an unorganized way, which brings huge environmental risks to the city and has huge influence on the life quality of surrounding residents and the economic development of the city. The main components of the landfill gas are methane, carbon dioxide, nitrous oxide, ammonia gas and other trace gases. In recent years, along with the rapid increase of urban garbage output in China, the harm of landfill gas of a garbage landfill to the environment is increasingly prominent, and the environmental problem to be solved is formed.
Relevant researches show that improving the adsorption and oxidation capacity of the covering layer of the landfill to greenhouse gases is an economic and efficient means for controlling the release of the greenhouse gases of the landfill. At present, most of tests on harmful landfill gas adsorption and biological oxidation of an overburden layer of a refuse landfill are researches on steady-state and semi-steady-state properties, namely, the physicochemical properties and the stress state of the soil body of the overburden layer are assumed to be unchanged. In the actual situation, the suction force of the soil body is changed due to alternate seasons and transpiration caused by rainfall. Meanwhile, when the garbage truck drives, the mechanical construction is rolled and the biodegradation causes the garbage layer to be settled, the outer load bearing effect of the upper covering soil layer is changed. The change of the suction and the change of the external load cause the change of the internal stress of the soil body, thereby causing the change of the physicochemical properties of the soil body of the overburden layer, such as: density, pH, pore structure, etc. The change of the physical and chemical properties can influence the capacity of the soil body of the upper cladding for adsorbing and oxidizing the greenhouse gases, and in order to reasonably select the design parameters of the soil body of the upper cladding, a test device for the gas adsorption capacity and the oxidation efficiency of the soil body with controllable soil body external load is very necessary to research the change of the greenhouse gas adsorption and oxidation efficiency of the covering layer under different suction forces, loads and water contents of the soil body of the covering layer, so that the research results of more complete hydraulic and mechanical parameters of the soil body of the upper cladding and the oxidation efficiency of the landfill gases are obtained.
The device for testing the adsorption capacity of the soil body to the gas and the oxidation efficiency of the soil body with the controllable soil body external load can be used for researching the adsorption and oxidation efficiency of different modified soil samples and soil samples containing microorganisms on the landfill gas by changing the suction force and the external load of the soil body, so that the rule of the concentration change of the landfill gas in the soil body can be obtained in real time.
Disclosure of Invention
The invention provides a test device capable of controlling gas adsorption quantity and oxidation efficiency of soil outside a soil body, aiming at the characteristic that the change of the internal stress of the soil body on a covering layer on a landfill site can influence the physical and chemical properties of the soil body, and further cause the change of the adsorption and biological oxidation performance of the soil body on landfill gas.
The main idea of the invention is as follows:
1. the same saturated salt solution is used, the suction force of the soil body is kept unchanged, the vertical load is changed, and the change rule of the effects of soil sample adsorption and greenhouse gas oxidation when the suction force of the soil body is unchanged and the stress is changed is researched.
2. Keeping the vertical load unchanged, changing the soil sample suction value, researching the change rule of soil sample adsorption and greenhouse gas oxidation efficiency when the soil sample stress is unchanged and the suction force is changed.
3. When different working condition experiments of the soil body of the overlying strata are carried out, the change rule of the volume of the soil body can be measured through the displacement sensor. And combining the vertical stress to obtain the stress-strain relation of the soil sample.
4. When the volume of the soil sample is kept unchanged and the suction force of the soil sample is only changed, the change of the internal stress of the soil sample can be reflected through the load sensor, and the change relation between the suction force and the internal stress of the soil sample is obtained.
The instrument device has the advantages of simple and convenient design, flexible operation and good integrity, and can carry out continuous research on the reduction efficiency of the landfill gas of the upper cladding of the landfill under various working conditions.
In order to achieve the above purpose, and solve the problems of the prior art, the invention has the following conception:
the device comprises a sample bottom support, a sample chamber, a displacement sensor, a suction control system, a gas supply system to be detected, a gas detection system, a safety guide and exhaust system, a gas circulation system, a reaction frame loading system and a load sensor. The sample chamber comprises a sample chamber body, a chamber chassis and a chamber cover plate. The sample chamber is provided with spile mouths which are respectively connected with the gas detection system, the gas circulation system and the gas leading-out system, and the chamber chassis is provided with two spile mouths which are respectively connected with the suction control system and the gas supply system to be detected. After a soil sample is prepared in the sample chamber, a certain amount of gas to be detected is provided for the device through the gas supply system, the suction of the soil sample is controlled through the suction control device, meanwhile, the gas detection system reflects the change of the gas concentration in real time, the displacement sensor and the reaction frame loading system are arranged above the sample chamber, and the whole device can detect the change trend of the adsorption and oxidation efficiency of the sample and the change of the height of the sample under the action of different suctions and loads. The load sensor is arranged at the top of the loading rod, and when an experiment that the volume of the soil sample is constant and only the suction force of the soil sample is changed is carried out, the change of the stress in the soil sample can be reflected through the load sensor, so that the change relation between the suction force and the internal stress is obtained.
According to the inventive concept, the invention adopts the following technical scheme:
the utility model provides a controllable soil body of external load of soil sample is to gaseous adsorption capacity and oxidation efficiency experimental apparatus, is including the sample room of filling the sample, its characterized in that:
1) a reaction frame type loading system is used for implementing controllable external load on the sample in the sample chamber;
2) a pipe interface is arranged on the right side of the bottom surface of the sample chamber and is communicated with a gas supply system to be tested;
3) the left side of the bottom surface of the sample chamber is provided with a tube interface which is communicated with a suction control system;
4) the right side wall of the sample chamber is provided with a pipe interface which is communicated with a safety guide and discharge system;
5) the right side wall of the sample chamber is provided with a pipe interface which is communicated with a gas circulation system;
6) the top cover of the sample chamber is provided with two pipe interfaces which are communicated with a gas analysis system to be tested;
7) a displacement sensor is arranged between the sample chamber and the reaction frame system.
The suction control system is formed by connecting a peristaltic pump D with a gas washing bottle E filled with saturated saline solution, and the suction of the sample can be controlled by changing the type of the saturated saline solution.
The gas supply system to be tested is formed by connecting a valve B with a gas storage tank A. The gas supply device is connected to the sample chamber, and the flow rate of the gas can be controlled by a flow meter provided in the gas holder A.
The safety guide and exhaust system is formed by connecting a safety valve F with a pressure gauge G, the pressure gauge G monitors the change of the pressure in the device in real time, if dangerous conditions such as overlarge pressure are met, the safety valve is automatically opened, and gas is exhausted through a guide and exhaust port, so that the pressure in the device reaches a safety range.
The displacement sensor 1 is fixed on the loading rod through a bolt 2, and a telescopic needle of the displacement sensor is tightly leaned on the sample and used for reflecting the height change of the sample.
The test device supported by the test method has the advantages of simple structure, light design, convenience in operation, good integration performance and wide function.
Compared with the prior art, the invention has the following obvious substantive characteristics and obvious advantages:
1. the invention provides a set of test device for testing adsorption and oxidation of landfill gas of an overburden layer of a landfill aiming at the test research of adsorption and oxidation efficiency of the landfill gas of the overburden layer of the landfill, and can carry out performance test of reduction of the landfill gas of the overburden layer under different suction and external load conditions.
2. In the experimental device, the gas supply device can provide quantitative gas into the experimental device, and meanwhile, the change of the concentration of harmful gas in the experimental device can be monitored in real time through the gas detection system to obtain a concentration change trend chart. After the concentration is stabilized, the specific amount of the sample adsorbed or oxidized gas can be calculated.
3. The test device has the greatest innovation points that various technologies such as suction control, vertical load application, displacement monitoring, gas concentration monitoring and the like can be simultaneously applied, and the adsorption and oxidation efficiency of the soil body and the change of the volume of the soil body can be simultaneously measured under the change of suction and external force, so that the stress-strain relationship under the action of different suctions is obtained; the relationship between the suction force and the gas adsorption amount and the oxidation amount; the relationship between the stress and the amount of gas adsorbed and oxidized.
4. When the volume of the soil sample is kept constant and only the suction force of the soil sample is changed, the load sensor is arranged above the loading rod, so that the change rule of the internal stress of the soil sample is reflected in real time, and the change relation between the suction force and the internal stress of the soil sample is obtained.
The experimental device can achieve various purposes and realize the research on the adsorption and oxidation efficiency of the landfill gas. The experimental device sample preparation method and the preparation process are simple, the preparation material is easy to obtain, and the operation is simple and convenient. The gas is supplied in a centralized manner in a series connection mode, so that the test conditions are kept consistent in the long-term test process.
Drawings
FIG. 1 is an overall cross-sectional view of the testing device for controlling the suction force and the external load of the soil mass and measuring the gas adsorption capacity and the oxidation efficiency of the soil mass.
FIG. 2 is a top view of the base of the testing apparatus for controlling the suction force and the external load of the soil mass and measuring the gas adsorption amount and the oxidation efficiency of the soil mass.
FIG. 3 is a schematic view of a porous plate of the testing apparatus for controlling the suction force and external load of soil mass and measuring the gas adsorption amount and oxidation efficiency of soil mass according to the present invention.
FIG. 4 is a sectional view of the position 1-1 of the testing apparatus for controlling the suction force and the external load of the soil mass and measuring the gas adsorption amount and the oxidation efficiency of the soil mass according to the present invention.
FIG. 5 is a cross-sectional view of a sample fixing device of the testing device for controlling the suction force and the external load of the soil mass and measuring the gas adsorption amount and the oxidation efficiency of the soil mass.
FIG. 6 is a large drawing of the insertion tube opening 18 of the testing device for controlling the suction force and the external load of the soil mass and measuring the gas adsorption capacity and the oxidation efficiency of the soil mass.
FIG. 7 is a large drawing of the insertion tube ports 11, 12 and 19 of the testing device for controlling the suction force and the external load of the soil mass and measuring the gas adsorption capacity and the oxidation efficiency of the soil mass.
FIG. 8 is a part number diagram of the testing device for controlling the soil body suction and external load and measuring the gas adsorption capacity and oxidation efficiency of the soil body.
Detailed Description
The invention is further described in detail below with reference to the accompanying drawings and preferred embodiments:
example one
The utility model provides a controllable soil body of external load of soil sample is to gas adsorption capacity and oxidation efficiency experimental apparatus, includes the sample room 100 that fills the sample, its characterized in that:
1) a reaction frame type loading system 101 is provided for applying controllable external load to the sample in the sample chamber 100;
2) the right side of the bottom surface of the sample chamber 100 is provided with a pipe interface which is communicated with a gas supply system 102 to be measured;
3) the left side of the bottom surface of the sample chamber 100 is provided with a tube interface which is communicated with a suction control system 103;
4) the right side wall of the sample chamber 100 is provided with a pipe interface which is communicated with a safety drainage guide system 104;
5) the right side wall of the sample chamber 100 is provided with a pipe interface which is communicated with a gas circulation system 105;
6) the top cover of the sample chamber 100 is provided with two pipe interfaces which are communicated with a gas analysis system 106 to be tested;
7) a displacement sensor 107 is provided between the sample chamber 100 and the reaction frame system 101.
Example two
The present embodiment is substantially the same as the first embodiment, and has the following features:
the experimental device for the gas adsorption capacity and the oxidation efficiency of the soil body capable of controlling the external load of the soil sample comprises a sample chamber 100 and a sample chamber cover 8, wherein the sample chamber 100 is formed by connecting the upper end and the lower end of a sample chamber cylinder 15 with a base plate 20 and a top cover 8 through O-rings 6 and 16 respectively through bolts 17; the inner cavity of the sample chamber 100 is sequentially provided with a permeable stone layer 13, a sample, a permeable stone layer 13 and a porous plate 10 from top to bottom; silicone grease 14 for sealing inner wall of sample chamber 100
The reaction frame type loading system 101 is: a support 22 is arranged on the chassis of a reaction frame 23, and the height of the support 22 can be adjusted by screwing a base cylinder 21 on the support 22; the top end of the base cylinder 21 supports the bottom surface of the sample chamber 100; the top end of a loading rod 9 is connected below the top beam of the reaction frame 23 through a telescopic column 29 and a load sensor 28, and the lower end of the loading rod 9 is pressed against the porous plate 10 after penetrating through the top cover 8 of the sample chamber 100;
the displacement sensing means 107 is: a displacement sensor 1 is fixed on a loading rod 9 through a bolt 2, and a contact of the displacement sensor is abutted against a top cover 8 of the sample chamber 100; the suction control system 103 is formed by connecting a peristaltic pump D with a gas washing bottle E filled with saturated saline solution, and can continuously provide gas with the saturated saline solution for the sample by changing the type of the saturated saline solution so as to control the suction of the sample;
the gas supply system 102 to be tested is composed of a valve B and a gas storage tank A connected with the valve B. The ventilation quantity of the gas can be controlled by arranging a flowmeter on the gas storage tank A;
the safety guide and exhaust system 104 is composed of a safety valve F connected with a pressure gauge G, the pressure gauge G monitors the change of the gas pressure in the device in real time, if dangerous conditions such as overlarge pressure and the like are met, the safety valve is automatically opened, and gas is exhausted through a guide and exhaust port, so that the gas pressure in the device reaches a safety range;
the displacement sensor device 107 is used to measure the change in the height of the sample.
EXAMPLE III
This embodiment is basically the same as the second embodiment, and is characterized in that:
the device for testing the adsorption capacity of the soil body to gas and the oxidation efficiency of the soil body with the controllable external load of the soil body is characterized in that a load sensor is arranged at the top of a reaction frame, so that the load sensor is in close contact with the top of a loading rod, and the volume of a sample is kept constant. In the experimental process of soil sample adsorption and oxidizing gas efficiency, the change of the internal stress of the soil sample is monitored in real time, and the relation between the stress and the suction is obtained.
Example four
Referring to fig. 1 to 8, the test device for controlling the external load of the soil body and measuring the gas adsorption capacity and the oxidation efficiency of the soil body comprises a bottom support, a sample chamber, a displacement sensor, a suction control device, a gas supply device, a sampling analysis device, a safe drainage guide device, a gas circulation device, a reaction frame loading system, a load sensor and the like. The sample holder 22 is a metal cylinder welded to the reaction frame loading system 23. The sample chamber is composed of a base 21, a bottom plate 20, a sample fixing chamber 15 and a cover plate 8. The base plate 20, the sample holding chamber 15 and the cover plate 8 are connected together by screws 17, respectively. The cylinder 21 constituting the base is welded to the bottom plate 20. The chassis has two socket ports 18, 19. The nozzle 18 is connected with the suction control system E, and the nozzle 19 is connected with the air supply system A to be tested. The sample chamber 15 is made of acrylic plastic, and two spile ports 11 and 12 are respectively arranged on the sample chamber 15. The cannula port 12 is used for connecting the exhaust device G, and the cannula port 11 is connected with the gas circulation device C. The cover plate 8 is made of metal and is provided with a preformed hole 3 and is sealed by a butyl rubber plug which has a self-sealing function. The loading device consists of a reaction frame loading system 23 and a loading rod 9. The displacement sensor 1 is fixed on a loading rod 9 through a bolt 2. The load sensor 28 and the telescopic column 29 are fixed to the reaction frame 23.
During the experiment, the reaction frame loading system 23 and the support 22 which are welded together are placed on the experiment platform, and then the base cylindrical portion 21 of the sample chamber 15 is embedded in the support 22 by screwing. The sample chamber 15 is placed on the base plate 20, an O-ring 16 is provided between the sample chamber 15 and the sample chamber base plate 20, and the sample chamber 15 and the base plate 20 are fixed tightly by bolts 17 to maintain sealing. A permeable stone 13 is placed on the bottom of a sample chamber 15, and before filling with a soil sample, a sealing silicone grease 14 is applied to the inner wall of the sample chamber in advance, and then the soil sample is filled in layers. When the sample is prepared, the soil sample which is prepared in advance is compacted to a preset height by a compaction hammer, so that whether the sample reaches a preset dry density or not is controlled. Then, a permeable stone 13 and a porous plate 10 are sequentially put on the sample. After the sample is prepared, an O-ring 6 is placed in the sample chamber 15 and fixed by a bolt 7. After the sample chamber is installed, the loading rod 9 enters the sample chamber through the preformed hole 3 on the cover plate 8 of the sample chamber and is connected with the porous plate 10, and then the displacement sensor 1 is fixed on the loading rod through the bolt 2. Finally, the telescopic column 29 of the load sensor 28 is fixed on the reaction frame, so that the sensing probe is just contacted with the loading rod. After the experimental device is installed, the suction control system E is connected with the air cavity socket opening 18, the gas supply systems A and B to be tested are connected with the air cavity socket opening 19, the gas circulating devices B and C are connected through the air cavity socket opening 11, the gas inverted arrangement system G is connected with the air cavity socket opening 12, and the gas detection and analysis device G is connected with the air cavity socket opening 5.
Assembly test example 1
The test experiment for researching the change rule of soil body adsorption and greenhouse gas oxidation efficiency under the action of different suction forces by maintaining the loading unchanged comprises the following experimental steps:
the first step is as follows: the reaction frame loading system 23 and the base 22 are placed on the test platform, and the sample chamber chassis cylinder 21 is aligned with the spiral groove on the base 22 and screwed and fixed.
The second step is that: the sample chamber 15 is placed on the sample chamber base plate 20, the O-ring 16 is provided between the sample chamber 15 and the sample chamber base plate 20, and the sample chamber 15 and the base plate 20 are fixed tightly by the bolts 17 to maintain sealing. A permeable stone 13 is placed on the bottom of a sample chamber 15, and before filling with a soil sample, a sealing silicone grease 14 is previously applied to the inner wall of the sample chamber, and then the soil sample is filled in layers. When the sample is prepared, the soil sample which is prepared in advance is compacted to a preset height by a compaction hammer, so that whether the sample reaches a preset dry density or not is controlled. Then, a permeable stone 13 and a porous plate 10 are sequentially put on the sample. After the sample is prepared, an O-ring 6 is placed in the sample chamber 15 and fixed by a bolt 7. An O-shaped rubber ring 4 is arranged at a preformed hole 3 on a sample cover plate 8, and a loading rod 9 penetrates through the preformed hole 3 to enter a sample chamber and is connected with a porous plate 10. The upper part of the loading rod 9 is connected with a reaction frame loading system.
The third step: is connected with a suction control device. Placing a certain prepared saturated salt solution in a gas washing bottle E, connecting an air outlet rubber tube of a circulating pump D with the gas washing bottle E, sleeving an air inlet tube of the circulating pump D on a tube inserting opening glass tube 24, sleeving an air outlet tube of the gas washing bottle on a tube inserting opening glass tube 25, and installing a butyl rubber plug 26 at the tube inserting opening 18 after ensuring that the sleeve is airtight. An exhaust system is connected. The large flow valve F is connected with the air outlet of the pressure gauge G through a rubber air pipe, and the air inlet rubber pipe of the pressure gauge G is sleeved on the glass pipe 27 on the cannula port 12. And connecting a gas analysis system, and respectively installing an injection needle J on a pump suction pipe and an exhaust pipe of the gas analyzer. And (3) plugging a butyl rubber plug which is consistent with the size of the hole at the reserved opening 5, and then pricking the air suction pipe needle head and the air exhaust pipe needle head into the butyl rubber plug. Is connected with the circulating system. The circulating pump C is connected with the valve B through a rubber pipe, and the air outlet rubber pipe of the valve is sleeved on the glass pipe 27 of the pipe inserting opening 11. And connecting the gas supply system to be tested. The gas cylinder A filled with the gas to be detected and the safe quantitative valve B are sleeved with the gas outlet rubber tube of the valve B on the glass tube 27 of the cannula 19.
The fourth step: the vertical load of the reaction frame loading system is set, and the external load is transmitted to the sample through the loading rod. Circulation system B, C and exhaust system F, G are opened to vent any unwanted gases that may be present in the sample chamber. After the operation is carried out for 10min, the circulating system and the exhaust system are closed, the pneumatic pump D of the suction control system is started, the moisture migration between gas phases is accelerated, and the two phases are balanced to achieve the effect of controlling the suction. After the balance is achieved, setting the air supply flow rate and time of the air supply system to be detected, opening the valve B to carry out quantitative air supply, closing the air supply valve B immediately after air supply is completed, opening the air analysis device, setting the air analysis system G to measure the air concentration once every 2 minutes and storing data. When the concentration displayed by the analyzer is not changed or the change amplitude is small, the adsorption or oxidation limit state is considered to be reached.
The fifth step: the gas analysis system G was turned off, then the suction control system D, E was turned off, and finally the exhaust system F, G and the circulation system B, C were opened to discharge the waste gas after the experiment out of the instrument. The entire experiment was completed by closing the exhaust system F, G and the circulation system B, C after the exhaust was completed.
The external load applied by the reaction frame loading system is kept unchanged, the type of saturated salt solution in the gas washing bottle is changed, and the influence of the change of suction on the efficiency rules of soil body adsorption and greenhouse gas oxidation can be measured when the stress is unchanged.
Assembly test example 2
The method maintains the suction unchanged, and researches the experiments of the efficiency change rule of soil body adsorption and greenhouse gas oxidation when different vertical loads are applied, and the experimental steps are as follows:
the first step is as follows: the reaction frame loading system 23 and the base 22 are placed on the test platform, and the sample chamber chassis cylinder 21 is aligned with the spiral groove on the base 22 and screwed and fixed.
The second step is that: the sample chamber 15 is placed on the sample chamber base plate 20, the O-ring 16 is provided between the sample chamber 15 and the sample chamber base plate 20, and the sample chamber 15 and the base plate 20 are fixed tightly by the bolts 17 to maintain sealing. A permeable stone 13 is placed on the bottom of a sample chamber 15, and before filling with a soil sample, a sealing silicone grease 14 is previously applied to the inner wall of the sample chamber, and then the soil sample is filled in layers. When the sample is prepared, the soil sample which is prepared in advance is compacted to a preset height by a compaction hammer, so that whether the sample reaches a preset dry density or not is controlled. Then, a permeable stone 13 and a porous plate 10 are sequentially put on the sample. After the sample is prepared, an O-ring 6 is placed in the sample chamber 15 and fixed by a bolt 7. After the installation of the sample chamber is finished, an O-shaped sealing rubber ring 4 is installed at the preformed hole 3 on the cover plate 8, the loading rod 9 is connected with the perforated plate 10 through the preformed hole 3, and the upper end of the loading rod 9 is connected with the reaction frame loading system 23.
The third step: is connected with a suction control device. Placing a certain prepared saturated salt solution in a gas washing bottle E, connecting an air outlet rubber tube of a circulating pump D with the gas washing bottle E, sleeving an air inlet tube of the circulating pump D on a tube inserting opening glass tube 24, sleeving an air outlet tube of the gas washing bottle on a tube inserting opening glass tube 25, and installing a butyl rubber plug 26 at the tube inserting opening 18 after ensuring that the sleeve is airtight. An exhaust system is connected. The large flow valve F is connected with the air outlet of the pressure gauge G through a rubber air pipe, and the air inlet rubber pipe of the pressure gauge G is sleeved on the glass pipe 27 on the cannula port 12. And connecting a gas analysis system, and respectively installing an injection needle J on a pump suction pipe and an exhaust pipe of the gas analyzer. And (3) plugging a butyl rubber plug which is consistent with the size of the hole at the reserved opening 5, and then pricking the air suction pipe needle head and the air exhaust pipe needle head into the butyl rubber plug. Is connected with the circulating system. The circulating pump C is connected with the valve B through a rubber pipe, and the air outlet rubber pipe of the valve is sleeved on the glass pipe 27 of the pipe inserting opening 11. And connecting the gas supply system to be tested. The gas cylinder A filled with the gas to be detected and the safe quantitative valve B are sleeved with the gas outlet rubber tube of the valve B on the glass tube 27 of the cannula 19.
The fourth step: the vertical loading size of the reaction frame loading system is set, and the external load is transmitted to the sample through the loading rod. Circulation system B, C and exhaust system F, G are opened to vent any unwanted gases that may be present in the sample chamber. After the operation is carried out for 10min, the circulating system and the exhaust system are closed, the pneumatic pump D of the suction control system is started, the moisture migration between gas phases is accelerated, and the two phases are balanced to achieve the effect of controlling the suction. After the balance is achieved, the sample is loaded through the reaction frame loading system 23 and the loading rod 19, the air supply flow rate and time of the air supply system to be tested are set after the sample is loaded, the valve B is opened to carry out quantitative air supply, the air supply valve B is closed immediately after the air supply is completed, the air analysis device is opened, and the air analysis system G is set to measure the air concentration once every 2 minutes and store data. When the concentration displayed by the analyzer does not change any more or changes a little, the limit state of adsorption or oxidation is considered to be reached.
The fifth step: the gas analysis system G was turned off, then the suction control system D, E was turned off, and finally the exhaust system F, G and the circulation system B, C were opened to discharge the waste gas after the experiment out of the instrument. The entire experiment was completed by closing the exhaust system F, G and the circulation system B, C after the exhaust was completed.
The suction force is kept unchanged, and the influence trend of different loading masses on sample adsorption and oxidizing gas under the same suction force action can be explored by changing the load of the reaction frame loading system to relieve the bowels.
Assembly test example 3
In the experiment of exploring the efficiency change rule of soil body adsorption and greenhouse gas oxidation, a displacement sensor is installed to monitor the change of the volume of the soil body, and the experiment steps are as follows:
the first step is as follows: the reaction frame loading system 23 and the base 22 are placed on the test platform, and the sample chamber chassis cylinder 21 is aligned with the spiral groove on the base 22 and screwed and fixed.
The second step is that: the sample chamber 15 is placed on the sample chamber base plate 20, the O-ring 16 is provided between the sample chamber 15 and the sample chamber base plate 20, and the sample chamber 15 and the base plate 20 are tightly fixed by the bolts 17 to maintain sealing. A permeable stone 13 is placed on the bottom of a sample chamber 15, and before filling with a soil sample, a sealing silicone grease 14 is previously applied to the inner wall of the sample chamber, and then the soil sample is filled in layers. When the sample is prepared, the soil sample which is prepared in advance is compacted to a preset height by a compaction hammer, so that whether the sample reaches a preset dry density or not is controlled. Then, a permeable stone 13 and a porous plate 10 are sequentially put on the sample. After the sample is prepared, an O-ring 6 is placed in the sample chamber 15 and fixed by a bolt 7. After the installation of the sample chamber is finished, an O-shaped sealing rubber ring 4 is installed at the preformed hole 3 on the cover plate 8, the loading rod 9 is connected with the perforated plate 10 through the preformed hole 3, and the upper end of the loading rod 9 is connected with the reaction frame loading system 23. The displacement sensor 1 is secured to the load bar 9 by bolts 2 and the initial reading on the displacement meter is recorded.
The third step: and connecting a suction control system. Placing a certain prepared saturated salt solution in a gas washing bottle E, connecting an air outlet rubber tube of a circulating pump D with the gas washing bottle E, sleeving an air inlet tube of the circulating pump D on a tube inserting opening glass tube 24, sleeving an air outlet tube of the gas washing bottle on a tube inserting opening glass tube 25, and installing a butyl rubber plug 26 at the tube inserting opening 18 after ensuring that the sleeve is airtight. An exhaust system is connected. The large flow valve F is connected with the air outlet of the pressure gauge G through a rubber air pipe, and the air inlet rubber pipe of the pressure gauge G is sleeved on the glass pipe 27 on the cannula port 12. And connecting a gas analysis system, and respectively installing an injection needle J on a pump suction pipe and an exhaust pipe of the gas analyzer. And (3) plugging a butyl rubber plug which is consistent with the size of the hole at the reserved opening 5, and then pricking the air suction pipe needle head and the air exhaust pipe needle head into the butyl rubber plug. Is connected with the circulating system. The circulating pump C is connected with the valve B through a rubber pipe, and the air outlet rubber pipe of the valve is sleeved on the glass pipe 27 of the pipe inserting opening 11. And connecting the gas supply system to be tested. The gas cylinder A filled with the gas to be detected and the safe quantitative valve B are sleeved with the gas outlet rubber tube of the valve B on the glass tube 27 of the cannula 19.
The fourth step: the vertical loading size of the reaction frame loading system is set, and the external load is transmitted to the sample through the loading rod. Circulation system B, C and exhaust system F, G are opened to vent any unwanted gases that may be present in the sample chamber. After the operation is carried out for 10min, the circulating system and the exhaust system are closed, the pneumatic pump D of the suction control system is started, the moisture migration between gas phases is accelerated, and the two phases are balanced to achieve the effect of controlling the suction. After the balance is achieved, the sample is loaded through the reaction frame loading system 23 and the loading rod 19, the air supply flow rate and time of the air supply system to be tested are set after the sample is loaded, the valve B is opened to carry out quantitative air supply, the air supply valve B is closed immediately after the air supply is completed, the air analysis device is opened, and the air analysis system G is set to measure the air concentration once every 2 minutes and store data. When the concentration displayed on the gas detector does not change any more or the change amplitude is small, the limit state of adsorption or oxidation is considered to be reached.
The fifth step: the gas analysis system G was turned off, then the suction control system D, E was turned off, and finally the exhaust system F, G and the circulation system B, C were opened to discharge the waste gas after the experiment out of the instrument. The entire experiment was completed by closing the exhaust system F, G and the circulation system B, C after the exhaust was completed.
After the experiment is finished, the final value on the displacement sensor is read and the initial value of the displacement meter is subtracted, so that the volume change of the sample in the experiment process can be measured, the change rule of the sample volume under different working conditions can be measured by the installation of the displacement sensor, and then the relation among stress, suction, volume change, adsorption and oxidation efficiency can be obtained.
Assembly test example 4
In the experiment of exploring soil body absorption, oxidation greenhouse gas efficiency change law, the installation load sensor, when the research keeps soil sample volume invariable only changes soil sample suction, the change of monitoring soil body internal stress, the experimental procedure is as follows:
the first step is as follows: the reaction frame loading system 23 and the base 22 are placed on the test platform, and the sample chamber chassis cylinder 21 is aligned with the spiral groove on the base 22 and screwed and fixed.
The second step is that: the sample chamber 15 is placed on the sample chamber base plate 20, the O-ring 16 is provided between the sample chamber 15 and the sample chamber base plate 20, and the sample chamber 15 and the base plate 20 are tightly fixed by the bolts 17 to maintain sealing. A permeable stone 13 is placed on the bottom of a sample chamber 15, and before filling with a soil sample, a sealing silicone grease 14 is previously applied to the inner wall of the sample chamber, and then the soil sample is filled in layers. When the sample is prepared, the soil sample which is prepared in advance is compacted to a preset height by a compaction hammer, so that whether the sample reaches a preset dry density or not is controlled. Then, a permeable stone 13 and a porous plate 10 are sequentially put on the sample. After the sample is prepared, an O-ring 6 is placed in the sample chamber 15 and fixed by a bolt 7. After the sample chamber is installed, an O-shaped sealing rubber ring 4 is installed at the preformed hole 3 on the cover plate 8, and the loading rod 9 is connected with the porous plate 10 through the preformed hole 3. A load sensor 28 is arranged on the top of the reaction frame 23, and an expansion link 29 is adjusted to enable a sensing probe of the load sensor to be in close contact with the upper end of the loading rod 9.
The third step: and connecting a suction control system. Placing a certain prepared saturated salt solution in a gas washing bottle E, connecting an air outlet rubber tube of a circulating pump D with the gas washing bottle E, sleeving an air inlet tube of the circulating pump D on a tube inserting opening glass tube 24, sleeving an air outlet tube of the gas washing bottle on a tube inserting opening glass tube 25, and installing a butyl rubber plug 26 at the tube inserting opening 18 after ensuring that the sleeve is airtight. An exhaust system is connected. The large flow valve F is connected with the air outlet of the pressure gauge G through a rubber air pipe, and the air inlet rubber pipe of the pressure gauge G is sleeved on the glass pipe 27 on the cannula port 12. And connecting a gas analysis system, and respectively installing an injection needle J on a pump suction pipe and an exhaust pipe of the gas analyzer. And (3) plugging a butyl rubber plug which is consistent with the size of the hole at the reserved opening 5, and then pricking the air suction pipe needle head and the air exhaust pipe needle head into the butyl rubber plug. Is connected with the circulating system. The circulating pump C is connected with the valve B through a rubber pipe, and the air outlet rubber pipe of the valve is sleeved on the glass pipe 27 of the pipe inserting opening 11. And connecting the gas supply system to be tested. The gas cylinder A filled with the gas to be detected and the safe quantitative valve B are sleeved with the gas outlet rubber tube of the valve B on the glass tube 27 of the cannula 19.
The fourth step: circulation system B, C and exhaust system F, G are opened to vent any unwanted gases that may be present in the sample chamber. After the operation is carried out for 10min, the circulating system and the exhaust system are closed, the pneumatic pump D of the suction control system is started, the moisture migration between gas phases is accelerated, and the two phases are balanced to achieve the effect of controlling the suction. After the balance is achieved, the sample is loaded through the reaction frame loading system 23 and the loading rod 19, the air supply flow rate and time of the air supply system to be tested are set after the sample is loaded, the valve B is opened to carry out quantitative air supply, the air supply valve B is closed immediately after the air supply is completed, the air analysis device is opened, and the air analysis system G is set to measure the air concentration once every 2 minutes and store data. When the concentration displayed on the gas detector does not change any more or the change amplitude is small, the limit state of adsorption or oxidation is considered to be reached.
The fifth step: the gas analysis system 106 is closed, then the suction control system 103 is closed, finally the safety exhaust system 104 and the gas circulation system 105 are opened, and the waste gas after the experiment is discharged out of the instrument. After the exhaust is completed, the safety exhaust system 104 and the gas circulation system 105 are closed, and the whole experiment is completed.
And recording the change of the stress value displayed by the load sensor in real time during the experiment, and drawing a stress-suction curve to obtain the relation between the internal stress and the suction of the soil sample when the suction changes.
Claims (9)
1. The utility model provides a controllable soil body of external load of soil sample is to gas adsorption capacity and oxidation efficiency experimental apparatus, includes sample chamber (100) of filling the sample, its characterized in that:
a reaction frame type loading system (101) is arranged to apply controllable external load to the sample in the sample chamber (100);
the right side of the bottom surface of the sample chamber (100) is provided with a pipe interface which is communicated with a gas supply system (102) of the gas to be measured;
the left side of the bottom surface of the sample chamber (100) is provided with a tube interface which is communicated with a suction control system (103);
the right side wall of the sample chamber (100) is provided with a pipe interface which is communicated with a safety guide and exhaust system (104);
the right side wall of the sample chamber (100) is provided with a pipe interface which is communicated with a gas circulation system (105);
the top cover of the sample chamber (100) is provided with two pipe interfaces which are communicated with a gas analysis system (106) to be tested;
a displacement sensor (107) is provided between the sample chamber (100) and the reaction frame system (101).
2. The experimental device for the gas adsorption capacity and the oxidation efficiency of the soil body with the controllable soil sample external load according to claim 1, is characterized in that: the sample chamber (100) is formed by connecting the upper end and the lower end of a sample chamber cylinder (15) with a base plate (20) and a top cover (8) through O-rings (6,16) and bolts (17) respectively; the inner cavity of the sample chamber (100) is sequentially provided with a permeable stone layer (13), a sample, a permeable stone layer (13) and a porous plate (10) from top to bottom; the inner wall of the sample chamber (100) is sealed with silicone grease (14);
the reaction force rack type loading system (101) comprises: a support (22) is arranged on a chassis of a reaction frame (23), and the height of the support (22) can be adjusted by screwing a base cylinder (21) on the support; the top end of the base cylinder (21) supports the bottom surface of the sample chamber (100); the lower part of the top beam of the reaction frame (23) is connected with the top end of a loading rod (9) through a telescopic column (29) and a load sensor (28), and the lower end of the loading rod (9) is pressed against the porous plate (10) after passing through a top cover (8) of the sample chamber (100); the displacement sensing means (107) is: a displacement sensor (1) is fixed on the loading rod (9) through a bolt (2), and the contact of the displacement sensor is abutted against a top cover (8) of the sample chamber (100); the suction control system (103) is formed by connecting a peristaltic pump D with a gas washing bottle (E) filled with saturated saline solution, and can continuously provide gas with the saturated saline solution for the sample by changing the type of the saturated saline solution so as to control the suction of the sample;
the gas supply system (102) to be tested is formed by connecting a valve (B) with a gas storage tank (A); the ventilation quantity of the gas can be controlled by arranging a flowmeter on the gas storage tank (A);
the safety guide and exhaust system (104) is formed by connecting a safety valve (F) with a pressure gauge (G), the pressure gauge (G) monitors the change of the gas pressure in the device in real time, if dangerous conditions such as overlarge pressure and the like are met, the safety valve is automatically opened, gas is exhausted through a guide and exhaust port, and the gas pressure in the device reaches a safety range;
the displacement sensor device (107) is used for measuring the change of the height of the sample.
3. The device for testing the adsorption capacity of the soil body to the gas and the oxidation efficiency of the soil body with the controllable external load of the soil body as claimed in claim 1, is characterized in that: the suction force of the soil body can be controlled, and the suction force of the soil sample can be kept unchanged by using the same saturated salt solution in the gas washing bottle (E) of the suction force control system (103); the suction force can be adjusted by changing the saturated saline solution type in the gas washing bottle (E).
4. The device for testing the adsorption capacity of the soil body to the gas and the oxidation efficiency of the soil body with the controllable external load of the soil body as claimed in claim 1, is characterized in that: the vertical load can be controlled, and the stress of the soil sample is changed; vertical load is applied to the reaction frame (23), the vertical load is transmitted to the sample through the loading rod (9), the stress state of the sample is changed, and the influence of stress change under different loads on the efficiency change of soil sample adsorption and greenhouse gas oxidation is researched.
5. The device for testing the adsorption capacity of the soil body to the gas and the oxidation efficiency of the soil body with the controllable external load of the soil body as claimed in claim 1, is characterized in that: the gas detection system connected with the test instrument has the functions of monitoring the gas concentration at fixed time and drawing a concentration curve, after quantitative gas to be detected is introduced into the test instrument, the data storage time interval of the gas detector is set, the gas detector is started, the change of the gas concentration in the test device can be monitored in real time, the efficiency of sample adsorption and oxidation gas is further reflected, the set time interval is 2min, and the gas detector stores concentration data at 2min, 4min and 6min … ….
6. The device for testing the gas adsorption capacity and the oxidation efficiency of the soil body with the controllable soil body external load according to claim 1, is characterized in that: the volume change of the soil body can be measured; a displacement sensor is arranged above a sample, the initial reading of the sensor is read before the test is started, the final reading on the displacement sensor is read after the test is finished, the difference value is the height change value of the sample, and the change of the volume of the sample in the test process can be calculated because the diameter of the sample is a constant value and is the inner diameter of a sample chamber in the test process; the change rule of the sample volume under different working conditions can be measured through the displacement sensor, and then the relation among stress, suction, volume change, adsorption and oxidation efficiency can be obtained.
7. The device for testing the gas adsorption capacity and the oxidation efficiency of the soil body with the controllable soil body external load according to claim 1, is characterized in that: the suction control, the vertical load application, the displacement monitoring, the gas concentration monitoring and other technologies can be simultaneously applied, and the adsorption and oxidation efficiency of the soil body and the change of the volume of the soil body can be simultaneously measured under the change of the suction and the external force, so that the stress-strain relationship under the action of different suctions is obtained; the relationship between the suction force and the gas adsorption amount and the oxidation amount; the relationship between the stress and the amount of gas adsorbed and oxidized.
8. The device for testing the gas adsorption capacity and the oxidation efficiency of the soil body with the controllable soil body external load according to claim 1, is characterized in that: the diversity of the test samples; the method not only performs experimental research on a pure soil sample, but also performs experimental research on the effects of adsorbing and oxidizing gas on biochar modified soil and soil containing microorganisms, and researches the relationship between different biochar doping amounts, microorganism doping amounts, suction and stress and soil sample adsorption and greenhouse gas oxidation.
9. The device for testing the gas adsorption capacity and the oxidation efficiency of the soil body with the controllable soil body external load according to claim 1, is characterized in that: a load sensor is arranged at the top of the reaction frame and is in close contact with the top of the loading rod, so that the volume of the sample is kept constant; in the experimental process of soil sample adsorption and oxidizing gas efficiency, the change of the internal stress of the soil sample is monitored in real time, and the relation between the stress and the suction is obtained.
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| CN112213255A (en) * | 2020-10-16 | 2021-01-12 | 南京林业大学 | Carbonization test method with adjustable carbon dioxide concentration |
| CN113176391A (en) * | 2021-03-29 | 2021-07-27 | 中国电建集团西北勘测设计研究院有限公司 | Soil testing device |
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