CN206774076U - Biogeochemistry experimental system for simulating under methane seepage condition - Google Patents

Abstract

The utility model relates to a biogeochemical action simulation experiment system under the condition of methane leakage, which is composed of a methane gas source through a silent air compressor, a gas booster pump, a gas storage container, a valve-controlled flowmeter and a check valve. The bottom of the reaction kettle in the thermostat is connected to the air inlet, the gas storage container is connected to the hand crank through the back pressure valve and the buffer tank, the advection pump is connected to the air inlet through the microbial container and the seawater container, and the vacuum pump is connected to the upper part of the reaction kettle. Outlet connection. Solved the description of the flow process of methane gas leakage and the description of the related microorganisms in the sedimentary layer, objectively reproduced the biogeochemical behavior caused by methane leakage in the seabed sedimentary layer, and facilitated students to understand the interaction between water-rock-gas-microbes and the role of associated microorganisms in the sedimentary layer. It provides favorable equipment and research methods for studying the formation mechanism of hydrate decomposition and its associated environmental effects.

Description

Biogeochemical simulation experiment system under the condition of methane seepage

technical field

The utility model relates to experimental teaching and scientific research equipment for natural gas hydrate associated biogeochemical action in sea areas, in particular to a simulation experiment device for methane leakage related to the decomposition of sea area natural gas hydrate and associated biogeochemical action.

Background technique

Energy, environment and development are important objects to be coordinated in the progress of human society. Finding a new type of clean energy is one of the important ways to deal with the relationship between the above three. As a brand-new, high-efficiency and clean energy with great potential, natural gas hydrate has attracted great attention from various countries and is considered as an alternative energy in the 21st century.

The stability of gas hydrate is often controlled by conditions such as temperature, pressure, geothermal gradient, gas composition, and pore water salinity. Changes in natural conditions or human exploration and development activities will cause the stability of gas hydrate to decompose and release Methane, forming a unique methane seepage environment in shallow sedimentary layers, and causing a series of biogeochemical effects. Methane biogeochemistry not only controls the leakage of methane to seawater (and even the atmosphere), but also is accompanied by a variety of geological and geochemical markers that help to explore seafloor hydrate deposits.

At present, the research on methane seepage related to hydrate decomposition and its associated biogeochemical behavior has just started. In view of the temporal and spatial variability of the methane seepage system, on the basis of sampling analysis and in-situ monitoring of the methane seepage area, supplemented by Related indoor experimental research is necessary. There are not many simulation experiment systems related to seabed methane seepage and its associated effects in China. The existing experimental devices can only simulate a single or part of the actual site conditions, and cannot accurately describe the flow behavior of methane in the seabed sediment layer. Reproduction and quantification of associated biogeochemical effects.

Indoor biogeochemical simulation is an essential part of teaching and an important experimental method for indoor teaching. Indoor biogeochemical simulation has important guiding significance for field geological work. At present, there is no teaching equipment and simulation experiment method for the simulation experiment of biogeochemical action under the condition of methane seepage.

Contents of the invention

The purpose of this utility model is to provide an intuitive teaching experimental device for the study of methane biogeochemical action and hydrate decomposition synthesis in view of the above-mentioned deficiencies in the prior art, aiming to solve the problem that the existing experimental device cannot realize the real seabed methane seepage Sedimentary layer environment where microorganisms exist. Through the experimental device, objectively simulate and characterize the real seabed methane seepage environment, conduct intuitive teaching and scientific and reasonable experimental research on the biogeochemical action of methane under the action of relevant microorganisms device;

The purpose of this utility model is achieved by the following technical solutions:

A biogeochemical simulation experiment system under the condition of methane leakage, which is composed of a methane gas source 1 through pipelines, valves and flanges through a silent air compressor 2, a gas booster pump 3, a gas storage container 4, and a valve-controlled flowmeter 5 and the check valve 6 are connected with the air inlet 24 that is arranged at the bottom of the reaction kettle 10 in the thermostat 17, and the methane leakage alarm 8 is installed on the upper part of the inner wall of the thermostat 17, and the gas storage container 4 passes through pipelines, valves and The flange is connected to the hand pump 16 through the back pressure valve 14 and the buffer tank 15, and the advection pump 13 is respectively connected to the microorganism container 11 with the piston and the seawater container 12 with the piston through the pipeline, the valve and the flange, and the microorganism container with the piston 11 and the seawater container 12 with piston are respectively connected to the air inlet 24 through pipelines, valves and flanges, the vacuum pump 18 is connected to the gas outlet 25 on the upper part of the reactor 10 through pipelines, valves and flanges, and the silent air compressor 2, gas Booster pump 3, valve-controlled flowmeter 5, check valve 6, temperature measurement sensor 7, methane leakage alarm 8, resistivity tester 9, advection pump 13, back pressure valve 14, thermostat 17, 18 vacuum pump, regulator The pressure valves V1-V2, the control valves F1-F18 and the pressure sensors P1-P6 are respectively connected with the control and display 19 to constitute.

The upper part of the reaction kettle 10 is provided with a temperature measuring port 22, an umbrella-shaped gas-liquid separator 23, an air inlet and outlet port 25, a vacuum port 27 and a pressure measuring port, the right side wall is provided with more than three gas sampling ports 20, and the left side wall is provided with a resistor The rate measurement port 21 is formed by a filter plate 26 inside the reaction kettle 10 .

The air inlet and outlet 25 provided on the top of the reactor 10 are connected with the pipeline between the control valve F3 and the back pressure valve 14 through a tee. When the reactor 10 is pressurized, the inlet and outlet 25 are air inlets. Air inlet and outlet 25 are air outlets during back pressure.

Beneficial effects: the utility model solves the problem of the description of the flow process of methane gas leakage and the description of the action of related microorganisms in the sedimentary layer, and can accurately simulate the phenomenon of methane leakage caused by the decomposition of seabed hydrate and its associated biogeochemical behavior. The invention combines temperature control, fluid pressure control, gas flow metering, water chemistry and microbial condition control, objectively reproduces the biogeochemical behavior caused by methane leakage in the seabed sediment layer, and is convenient for students to understand water-rock-gas - Microbial interactions and the role of associated microbes in sediments. It provides favorable equipment and research methods for studying the formation mechanism of hydrate decomposition and its associated environmental effects.

Description of drawings

Figure 1 is the mechanism diagram of the biogeochemical simulation experiment system under the condition of methane seepage

Fig. 2 is the sectional structure diagram of reactor 10 in Fig. 1

1. Methane gas source, 2. Silent air compressor, 3. Gas booster pump, 4. Gas storage container, 5. Valve-controlled flowmeter, 6. Check valve, 7. Temperature measurement sensor, 8. Methane leakage alarm, 9. Resistivity tester, 10 Reactor, 11 Microbiological container with piston, 12 Sea water container with piston, 13 Convection pump, 14 Back pressure valve, 15 Buffer tank, 16 Hand pump, 17 Thermostat, 18 Vacuum pump, 19 Control and display, 20 Liquid Sampling port, 21 resistivity measuring port, 22 temperature measuring port, 23 umbrella gas-liquid separator, 24 air inlet, 25 air inlet and outlet, 26 filter platen, 27 vacuum hole;

P1～P6 pressure sensor, V1～V2 pressure regulating valve, K1～K3 liquid sampling port, K4 gas sampling port, F1～F18 control valve.

detailed description

The utility model is described in further detail below in conjunction with accompanying drawing and specific embodiment.

A biogeochemical simulation experiment system under the condition of methane leakage, which is composed of a methane gas source 1 through pipelines, valves and flanges through a silent air compressor 2, a gas booster pump 3, a gas storage container 4, and a valve-controlled flowmeter 5 and the check valve 6 are connected with the air inlet 24 that is arranged at the bottom of the reaction kettle 10 in the thermostat 17, and the methane leakage alarm 8 is installed on the upper part of the inner wall of the thermostat 17, and the gas storage container 4 passes through pipelines, valves and The flange is connected to the hand pump 16 through the back pressure valve 14 and the buffer tank 15, and the advection pump 13 is respectively connected to the microorganism container 11 with the piston and the seawater container 12 with the piston through the pipeline, the valve and the flange, and the microorganism container with the piston 11 and the seawater container 12 with piston are respectively connected with the air inlet 24 through pipelines, valves and flanges, the vacuum pump 18 is connected with the vacuum hole 27 on the top of the reactor 10 through pipelines, valves and flanges, and the silent air compressor 2, Gas booster pump 3, valve-controlled flowmeter 5, check valve 6, temperature measurement sensor 7, methane leakage alarm 8, resistivity tester 9, advection pump 13, back pressure valve 14, thermostat 17, 18 vacuum pump, The pressure regulating valves V1-V2, the control valves F1-F18 and the pressure sensors P1-P6 are respectively connected with the control and display 19 to constitute.

The upper part of the reaction kettle 10 is provided with a temperature measurement port 22, an umbrella-shaped gas-liquid separator 23, 25 inlet and outlet ports, a vacuum port 27 and a pressure measurement port, and the right side wall is provided with more than three gas sampling ports 20, and the left side wall is provided with The resistivity measuring port 21 is formed by a filter plate 26 inside the reactor 10 .

The air inlet and outlet 25 provided on the upper part of the reactor 10 are connected to the pipeline between the control valve F3 and the back pressure valve 14 through a tee. When the reactor 10 is pressurized, the inlet and outlet 25 are air inlets. Air inlet and outlet 25 are air outlets during back pressure.

The control and display 19 is composed of an operation button panel, a display screen, a control module placed in a computer, a data acquisition system and a general data processing system.

The specific working process of the biogeochemical simulation experiment system under the condition of methane seepage:

1. According to the seawater composition of the research area, configure simulated seawater samples, cultivate relevant microbial solutions, some distilled water, sediment samples in the research area, and sufficient natural gas (CH ₄ ) gas source.

2. Set the silent air compressor 2, gas booster pump 3, valve-controlled flowmeter 5, check valve 6, temperature measurement sensor 7, methane leakage alarm 8, resistivity tester 9, advection pump 13, back pressure valve 14. Thermostat 17, vacuum pump 18, pressure regulating valves V1-V2, control valves F1-F18 and pressure sensors P1-P6 are respectively connected to the control and display 19, and the temperature measurement sensor 7 is placed in the temperature measurement port 22, the resistance The resistivity measuring instrument 9 is placed in the resistivity measuring port 21, and the vacuum pump 18 is connected with the vacuuming hole 27;

3. Turn on the main power switch, check whether the circuit instruments of each part are normal, and check whether there is leakage in each part;

Putting the piston of the container to the bottom is to free up the maximum effective space for sample filling. Without explanation, the control valves of the entire experimental simulation system are set to the closed state, and the following settings are the same.

Open the loam cake and filter screen pressing plate 26 of reactor 10, add the sediment sample of about 1/3 volume, then cover filter screen pressing plate 26 and loam cake, connect each pipeline that links to each other with reactor 10;

4. Open the control valves F14, F15, air vent valve F16, then open the top cover of the microbial container 11 with piston and the seawater container 12 with piston, press the pistons of the two containers to the bottom, and then close the control valves F14, F15 and air vent valve F16.

5. Vacuumize the reactor and pipeline, open the control valves F3, F4, F7, F11, turn on the switch of the vacuum pump 18, and vacuumize the reactor and pipeline. When the pressure display reading of the vacuum gauge P5 is -0.1Pa, Keep for about 30 minutes, complete the vacuuming of the reactor and pipeline, close the control valves F3, F4, F7, F11, and close the vacuum pump 18.

6. Open the control valves F11, F13, F15 and F17, start the advection pump 13, inject the simulated seawater configured in the seawater container 12 with piston into the reactor 10, and close the advection when the liquid in the reactor reaches 3/4 volume Pump 13, close the control valves F11, F13, F15 and F17; then close the top cover of the seawater container 12 with the piston, so that the seawater container 12 with the piston is in an airtight state;

7. Open the control valves F14 and F17, start the advection pump 13, increase the pressure of the microbial container 11 with the piston until the reading of the pressure gauge P6 is greater than the pressure gauge P3 of the reactor 10, open the control valves F11 and F12, and prepare the microbial solution Inject into the reactor 10, after the injection is completed, close the advection pump 13, control valves F11, F12, F14 and F17; the microbial container 11 with the piston, so that the microbial container 11 with the piston is in a closed state;

8. Start the incubator and set the temperature of the incubator so that the temperature in the reactor is 10°C;

9. Back pressure setting and reactor pressurization, use the hand pump 16 and buffer tank 15 to set the back pressure for the back pressure valve 14 to 10MPa, turn the handle of the hand pump 16 until the pressure gauge P4 reads 10Mpa;

Open the control valve F1 of the methane gas source 1, the pressure regulating valve V1, start the control switch of the silent air compressor 2 and the gas booster pump 3, pressurize the methane and store it in the gas storage container 4, and the reading of the pressure gauge P1 reaches 10Mpa Finally, close the control valve F1, the pressure regulating valve V1, close the silent air compressor 2 and the gas booster pump 3;

Open the control valves F2 and F3 and the pressure regulating valve V2 to pressurize the reactor 10 until the display reading of the pressure gauge P3 is consistent with the initially set back pressure of the pressure gauge P4, then close the control valve F3 and the pressure regulating valve V2.

10. Flowing methane injection, set the methane gas flow rate required in the experiment to 10ppm through the valve-controlled flowmeter 5, adjust the pressure regulating valve V2, so that the reading of the inlet pressure gauge P2 is slightly greater than the set reactor pressure > 0.5MPa, open By controlling the valves F4 and F6, the methane gas moves to the reactor 10 and is controlled by the valve flow meter 5 to realize the injection of flowing methane.

11. Turn on the computer data acquisition system in Control and Display 19, set the acquisition items and parameters, pressure 10Mpa, temperature 10°C, flow rate 10ppm, resistivity measurement interval is 60 seconds, water sample and gas sample sampling interval is 24 hours, , data storage path, enable real-time data display, and display the time-lapse curve of monitoring data on the display screen in real time;

12. Sample collection and analysis. At the set time, water samples and gas samples are collected through the liquid sampling ports K1-K3 and gas sampling ports K4, and the chemical components of water in the water samples and gas samples are detected.

13. At the end of the experiment, close the control valves F2 and F4, the pressure regulating valve V2, turn the hand pump 16 to relieve the pressure in the back pressure valve 14, so that the pressure reading of the back pressure gauge P4 shows 0, and discharge the methane gas outdoors for safety. In the ventilated place, after the methane gas is exhausted, the pressure gauge 3 shows a reading of 0, and the valve F6 is closed.

14. Save the data, close the control and display. 19. Turn off the power switch.

15. Collect water samples and mud samples for analysis, collect water samples in the reactor, analyze the chemical composition characteristics of the water at the end of the experiment, and analyze the microbial characteristics.

The mud samples in the reaction kettle were collected, and the mineral changes of the samples were analyzed by means of X-ray diffraction and scanning electron microscopy.

16. Equipment maintenance, clean the internal cavity of the reaction kettle 10, the microbial container 11, and the seawater container 12, and clean the pipelines through which the seawater and microbial samples pass through with distilled water to prevent corrosion.

Claims (3)

1. biogeochemical action simulation experiment system under a kind of methane seepage condition, it is characterized in that, by methane gas source (1) by pipeline, valve and flange through silent air compressor (2), gas booster pump ( 3), the gas storage container (4), the valve-controlled flowmeter (5) and the check valve (6) are connected with the air inlet (24) provided at the bottom of the reaction kettle (10) in the thermostat (17) , a methane leakage alarm (8) is installed on the inner side wall of the incubator (17), and the gas storage container (4) is connected to the hand pump ( 16) connection, the horizontal flow pump (13) is connected with the microorganism container (11) with the piston and the seawater container (12) with the piston respectively through pipelines, valves and flanges, the microorganism container (11) with the piston and the seawater container with the piston The container (12) is connected to the air inlet (24) through pipelines, valves and flanges respectively, and the vacuum pump (18) is connected to the vacuum hole (27) on the upper part of the reactor (10) through pipelines, valves and flanges, and the silent air is compressed Machine (2), gas booster pump (3), valve-controlled flowmeter (5), check valve (6), temperature measurement sensor (7), methane leakage alarm (8), resistivity tester (9) , advection pump (13), back pressure valve (14), incubator (17), vacuum pump (18), set pressure regulating valve, control valve and pressure sensor are respectively connected with control and display (19) to form. 2. According to the biogeochemical action simulation experiment system under the methane seepage condition described in claim 1, it is characterized in that, the reactor (10) top is provided with temperature measuring port (22), umbrella-shaped gas-liquid separator (23) , air inlet and outlet (25), vacuum hole (27) and pressure measurement port, the right side wall is provided with more than three gas sampling ports (20), the left side wall is provided with resistivity measurement port (21), the reaction kettle (10) The inside is provided with a filter screen pressing plate (26) to form. 3. According to the biogeochemical action simulation experiment system under the methane seepage condition described in claim 2, it is characterized in that, the gas inlet and outlet (25) that reactor (10) top is provided with is connected with return valve (F3) through tee and control valve (F3). The pipeline connection between the pressure valve (14), when the reactor (10) is pressurized, the inlet and outlet (25) is the air inlet, and when the pressure in the reactor (10) is greater than the back pressure, the inlet and outlet (25) is the outlet .