CN103927921B - Hydrate Multi-functional analog experimental system under microbial action - Google Patents

Abstract

The invention discloses a multifunctional simulation experiment system for hydrates under the action of microorganisms, which consists of four subsystems: gas, liquid, microorganism injection system, simulation system, measurement and control system, and auxiliary system: the gas, liquid, and microorganism injection system consists of Silent air compressor, gas booster pump, gas storage container, natural gas source, first flow meter, seawater container with piston, gas-liquid mixing container with piston, microbial container with piston, pressure gauge, advection pump, regulator Pressure valves K1, K2, control valves F1-F15, control valve F21 and connecting pipelines are sequentially connected; the present invention has the characteristics of convenient use and high precision, and is suitable for popularization and application.

Description

Hydrate multifunctional simulation experiment system under the action of microorganisms

technical field

The invention belongs to the technical field of new energy, and relates to a multifunctional simulation experiment system of hydrate under the action of microorganisms.

Background technique

Natural gas hydrate is a solid crystalline compound formed by water and gas. Geological bodies in high-pressure and low-temperature environments such as deep sea and permafrost are suitable places for the formation and occurrence of hydrates. The reserves of natural gas hydrates exceed those of all conventional fossil fuels. In sum, it is considered to be the most important new type of clean and follow-up energy discovered in recent decades. The United States, Japan, India, and China have all carried out research on the formation and migration mechanism, occurrence characteristics, and mining methods of gas hydrates.

The formation and decomposition of natural gas hydrate is a very complicated process, involving multiphase fluid flow, phase transition, heat transfer, mechanical strain, etc. Timely research on the mechanism and technical methods in the process of natural gas hydrate formation and decomposition will not only benefit Studying the accumulation and accumulation mechanism of natural gas during formation can also provide theoretical support for the improvement of hydrate mining technology.

Experimental research, as an important means and method of hydrate research, has attracted more and more attention from relevant research institutions, and therefore many simulation experimental systems have been designed. The hydrate simulation experiment system in the prior art is generally composed of three parts: high pressure system, cooling system and test system, and some simulation experiment systems have added processing combinations, which are divided into visible stirred tank and invisible stirred tank according to the type of reactor , Invisible non-stirred tank. The action of microorganisms has an important impact on the formation and decomposition of hydrates, but the existing domestic experimental devices cannot meet the research needs of this aspect. Therefore, there is an urgent need to develop a hydrate experimental device that can simulate the action of microorganisms to achieve more scientific and objective experimental simulation research and improve the scientificity of experimental results.

Contents of the invention

The existing technology cannot simulate the influence of microorganisms on the hydrate formation and decomposition process, and the associated mineral experiment in the hydrate formation and decomposition process under the action of microorganisms. In order to solve the above technical problems, the present invention provides an easy-to-use, high-precision multi-functional simulation experiment system for hydrates under the action of microorganisms, and realizes real-time monitoring of the internal resistivity of the reactor during the hydrate experiment process, which is an important tool for hydrate experiment research. Favorable equipment conditions are provided.

The present invention can realize:

(1) Study the environmental conditions and mechanism of hydrate formation and decomposition process.

(2) Study the formation environment and mechanism of associated minerals in the process of hydrate formation.

(3) Research on the influence of microorganisms in the process of hydrate formation and decomposition can be realized.

(4) Real-time monitoring of the resistivity inside the reactor during the hydrate experiment can be realized.

The characteristic of this system is that it can be used for the experimental research of hydrate formation and decomposition under the action of microorganisms and associated minerals.

Its technical scheme is as follows:

A multifunctional simulation experiment system for hydrate under the action of microorganisms, which consists of four subsystems: gas, liquid, microorganism injection system, simulation system, measurement and control system, and auxiliary system:

The gas, liquid and microorganism injection system consists of a silent air compressor 1, a gas booster pump 2, a gas storage container 3, a natural gas source 4, a flow meter 5, a seawater container 6 with a piston, and a gas-liquid mixing container with a piston 7. Microorganism container 8 with piston, pressure gauge 9, advection pump 10, pressure regulating valves K1, K2, and control valves F1-F15, F21 are connected in sequence with connecting pipelines;

Described simulation system is connected by reaction kettle 12, thermostat 13, pressure sensor 21, vibrator 22, temperature sensor 23, reaction kettle window 11, the control valve F19 of liquid sampling port 14, gas sampling port 15, F20 and connecting pipeline successively made;

The effective volume of the reactor is 1000ml, the diameter is 80mm, and the height is 200mm; working pressure: 20MPa, design safety pressure: 25MPa; working temperature: -15～90℃, measurement accuracy: ±0.5℃; window specification: visible part: 20mm× 100mm, can observe gas, liquid, solid three-phase interface.

The measurement and control system collects flowmeter 5, high-range gas flowmeter 19, low-range gas flowmeter 20, pressure sensor 21, pressure gauge 9, vacuum pressure gauge 17, temperature sensor 23, and relevant flow and pressure of resistivity 16 in real time , temperature and resistivity real-time data, and the collected data are transmitted to the computer control system in real time to realize real-time computer control of the advection pump 10, silent air compressor 1, constant temperature box 13, and vacuum pump 18 to maintain the normal working state of the experimental simulation system;

The measurement and control system realizes real-time collection of temperature, pressure, and gas flow data of the entire system, real-time display of the working status of the control components, and an alarm when the temperature and pressure exceed the upper limit. Realize the automatic control and prompt of the whole measurement process; realize data drawing and reporting.

The flow collection is completed by the gas flowmeter 5 , the high-range gas flowmeter 19 and the low-range gas flowmeter 20 . The imported gas flow meter 5 is produced in the Netherlands, with a pressure resistance of 30MPa, online measurement, can measure instantaneous flow and cumulative flow, and has a standard 232 interface, which is automatically collected by the computer. Flowmeter model: F-230M, high-range flowmeter test range: 0 ~ 100mL/min, accuracy: 0.1%FS. The outlet is connected with a high-range gas flowmeter 19 and a low-range gas flowmeter 20, which can accurately measure the output gas volume, and can display instantaneous and cumulative flow rates. The flowmeter models are: DO7-11A/ZM, DO8-8B/ZM, working pressure: 3MPa, measuring range: 100ml/min, 30mL/min.

The pressure collection in the reaction kettle is completed through the pressure sensor 21 . Pressure sensor model: DG1300 Range: 0-30MPa, accuracy: 0.1%F.S. The pressure acquisition of the injection system is completed by the sensor 9, the pressure sensor model: DG1300, the range: 0-30MPa, the accuracy: 0.1%F.S.

The temperature collection is completed by the temperature sensor 23 . The testing and temperature control range is: -15°C to 90°C, and the accuracy is ±0.5°C. When the temperature is overheated, the system will display an overtemperature alarm and automatically cut off the power supply.

The resistivity measurement system adopts TH2818 high-precision electric bridge, and cooperates with the computer automatic collector to realize the computer online test record. Real-time changes in resistivity for precise monitoring of the hydrate formation process.

The data processing system is composed of a data processing module and a microcomputer system. The data processing module runs under Windows2000/XP environment, and uses Delphi programming. The working process of the instrument is displayed on the interface, which can realize man-machine dialogue. After the operator sets the parameters, it can be left unattended. The computer can automatically collect the pressure, flow, temperature, etc. of all monitoring points. The data collected by the computer can be processed to generate original Data reports, analysis reports and graphs, while generating database file formats for flexible use by users.

The auxiliary system is composed of a methane leakage alarm monitoring system 24, an online sampler connected to the liquid sampling port 14 and the gas sampling port 15, and a vacuum system connected in sequence.

The methane leakage alarm system is installed in the upper part of the incubator, which can monitor the concentration of methane gas in the incubator during the experiment in real time. When the concentration reaches the set upper limit, a gas leakage alarm will be issued, and the heating power of the incubator 13 will be cut off at the same time to ensure Safety of experimental instruments and operators.

Detection range of methane alarm device: 0-100%LEL, 0-100ppm, response time ≤30s, recovery time ≤60s, measurement error: ≤±5%LEL, explosion-proof grade: ExdⅡBT6, operating temperature: -20℃～70℃, Use humidity: ≤90%RH.

The online sampler is used to take samples during the experiment and analyze the changes of reactants in different experimental stages. Gas sampler volume 10ml, pressure: 25MPa; liquid sampler: volume 5ml, pressure: 25MPa.

The vacuum pumping system is composed of a vacuum pump 18, a vacuum pressure gauge 17, and a control valve F18, a control valve F22, and a control valve F23 connected in sequence, and is used for vacuuming the entire experimental system piping and reactor system. The model of the vacuum pump 18 is 2XZ-1, and the vacuum degree is 1×10 ⁻¹ Pa.

Beneficial effects of the present invention: the present invention realizes the experimental implementation of hydrate formation and decomposition under the action of microorganisms, which can be used to study the influence of microbial factors in the process of hydrate formation and decomposition, and to study the associated minerals in the process of hydrate formation and decomposition. The formation conditions provide favorable equipment conditions and research methods for the study of the formation mechanism of hydrates.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the hydrate multifunctional simulation experiment system under the action of microorganisms of the present invention, and the illustrations are marked in the figure: 1. Silent air compressor; 2. Gas booster pump; 3. Gas storage container; 4. Natural gas source; 5. Flow meter; 6. Seawater container with piston; 7. Gas-liquid mixing container with piston; 8. Microbial container with piston; 9. Pressure gauge; 10. Advection pump; 11. Reactor observation window; 12. Reactor; 13. Constant temperature box; 14. Liquid sampling port; 15. Gas sampling port; 16. Resistivity meter; 17. Vacuum pressure gauge; 18. Vacuum pump; 19. High range gas flow meter; 20. Low range gas flow 21. Pressure sensor; 22. Vibrator; 23. Temperature sensor; 24. Methane leakage alarm monitoring system; F1～F23 control valve; K1～K2 pressure regulating valve.

detailed description

The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Referring to Figure 1, the multifunctional simulation experiment system of hydrate under the action of microorganisms is composed of four subsystems: gas, liquid, microorganism injection system, simulation system, measurement and control system, and auxiliary system.

The specific use process of the hydrate multifunctional simulation experiment system under the action of microorganisms of the present invention is as follows:

1. Preparation of experimental materials

Design a certain concentration of NaCl solution (simulated seawater sample) of about 400ml, microbial solution of about 50ml, some distilled water, quartz sand (mud sample), natural gas (CH ₄ ).

2. Turn on the main power switch, (host panel, air compressor, incubator, sample dispenser) to see if the circuit instruments of each part are normal.

3. Set the pistons in the seawater container 6, the gas-liquid mixing container 7, and the microorganism container 8 to the bottom, and fill them with seawater samples and microbial samples.

The purpose of placing the plunger of the container at the bottom is to maximize the effective space for sample filling. (Note: In the absence of explanation, the control valves of the entire experimental simulation system are set to be closed, and the following settings are the same)

The specific implementation method is:

Open the control valves F8, F9, F11, and the air vent valve F12, then, open the upper lids of the seawater container 6, the gas-liquid mixing container 7, and the microorganism container 8, and press each container piston firmly to the bottom. Then close the control valves F8, F9, F11, and the air vent valve F12.

Inject seawater with appropriate concentration (400ml of NaCl solution) into the seawater container 6, leaving a certain space above the water sample in the container; inject the prepared microbial sample into the microbial container 8, leaving a certain space above the container. Then close the loam cake of container sea water container 6, gas-liquid mixing container 7, microorganism container 8, make 3 containers be in airtight state.

4. Vacuumize the seawater container 6, the gas-liquid mixing container 7, the upper part of the microbial container 8 and the gas storage container 3

The purpose of this process is to evacuate the upper air in the seawater container 6, the gas-liquid mixing container 7, and the microbial container 8, so as to ensure that when the gas-liquid mixing sample is prepared in the gas-liquid mixing container 7, and the air-liquid mixing container 7, the microbial container 8 In the process of injecting the sample into the reaction kettle 12, it is not affected by the original residual air in the container, and the accuracy of the experiment is guaranteed. At the same time, the gas storage container 3 is evacuated so that it will not be affected by the original air volume of the container when it receives the pressurized gas delivered by the gas booster pump, thereby improving the accuracy of the experiment.

The specific implementation method:

Open the control valves F7, F6, F5, K2, F3, F10, F14, F21, connect the other end of the control valve F21 to the vacant end of the control valve F22, open the control valves F22, F23, and turn on the vacuum pump on the control panel of the measurement and control system 18 control switches for vacuuming. When the pressure of the vacuum gauge 17 reaches 0.1Pa, stop vacuuming. Close control valves F22, F23, close control valves F21, F14, F10, F7, F6, F5, K2, F3. Disconnect the connection between control valves F21 and F22.

5. Gas-liquid mixed sample configuration

The purpose of this process is to configure a mixed sample of methane gas and seawater with a certain mixing ratio.

The specific implementation method:

Turn on F7, F8, F13, turn on the switch of the advection pump 10 on the control panel of the measurement and control system, slowly inject a certain volume of seawater into the gas-liquid mixing container 7, and then turn off F7, F8, F13 and the advection pump 10.

Then, open the control valve F1 of the natural gas source 4, the pressure regulating valve K1, the control valve F2 of the gas storage container 3, start the control switch of the silent air compressor 1 and the gas booster pump 2 on the control panel of the measurement and control system, and the natural gas The pressurization is stored in the gas storage container 3. When the pressure reaches the set pressure value, close the control valve F2, close the control valve F1, the pressure regulating valve K1, and close the silent air compressor 1 and the gas booster pump 2.

Then, open the control valve F3, adjust the pressure regulating valve K2, make the pressure gauge 5 reach the required value, open the control valves F5 and F6, and inject methane gas into the gas-liquid mixing container 7. When the pressure in the gas-liquid mixing container 7 reaches the required pressure, close the above-mentioned valves. Note down the inlet flow meter reading. The gas-liquid mixing container 7 is on a rotatable device, and the rotating device is started to fully mix the gas and liquid, so that the methane gas is dissolved in the brine as much as possible.

6. Reactor experimental sample filling

The specific implementation method:

Open the loam cake of reactor 12, fill the quartz sand (mud sample) of about 1/3 reactor volume in reactor, then cover loam cake, connect each pipeline on loam cake.

7. Reactor and pipeline vacuuming

Open the control valves F18 and F23, turn on the switch of the vacuum pump 18 on the control panel of the measurement and control system, and vacuumize the reactor. When the pressure of the vacuum gauge reaches 0.1Pa, close the control valves F18 and F23, and turn off the vacuum pump 18.

8. The gas-liquid mixed solution is injected into the reactor

The specific implementation method:

Start the advection pump 10, open the control valves F13 and F9, and when the pressure in the gas-liquid mixing container is increased to a certain value, turn on the "mixed liquid injection" switch on the control panel of the measurement and control system, open the control valves F6, F10, F15, and the mixed liquid Slowly injected into the reactor under pressure differential drive. When the liquid in the reactor reaches the set volume (for example, the liquid level of the mixed liquid in the reactor reaches about 1/3 of the top of the reactor), close the control valves F15, F10, F6, F9, F13, and turn off the advection pump 10.

9. The microbial solution is injected into the reactor

Start the advection pump 10, open the control valves F13, F11, and when the reading of the pressure gauge 9 is greater than the pressure value of the pressure gauge 21 of the reactor 12, open the control valves F14, F15, and inject the microbial solution into the reactor. Then, close the control valves F15 , F14 , F11 , and F13 , and turn off the flat-flow pump 10 .

10. Reactor pressurization

Open the control valve F3, adjust the pressure regulating valve K2, so that the reading of the pressure gauge 5 is greater than the reading of the pressure gauge 21, open the control valve F4, pressurize the reactor, and when the pressure of the reactor reaches the required pressure, close the control valve F4, F3, close the pressure regulating valve K2. If the pressure of the pressure gauge 5 does not reach the set pressure, the gas booster pump 2 and the air compressor 1 need to be restarted to pressurize and store the gas in the natural gas source 4 into the gas storage container 3 .

11. Thermostat constant temperature

Start the thermostat temperature setting of the measurement and control system, so that the temperature of the simulation system is at the set temperature.

12. Real-time data display and processing

Turn on the computer data acquisition system, set the time interval for collecting pressure, temperature, flow, resistivity and other data, and set various types of data storage paths. Turn on the real-time data display function, and display the time-lapse curve of the monitoring data on the computer screen in real time.

13. Sample collection and analysis

At the set time, water samples and gas samples are collected through the liquid sampling port 14 and gas sampling port 15, and the water chemical components in the water samples and gas samples are detected, and combined with the graph of the resistivity meter 16, it is determined when the experiment ends.

14. Emission and measurement of methane gas in the reactor after the experiment

After the experiment is over, open the control valves F16 and F17, and the high-range gas flowmeter 19 or the low-range gas flowmeter 20 will automatically monitor the amount of gas discharged from the reactor, and the methane gas must be discharged to an outdoor safe and ventilated place. After the methane gas is exhausted, close the control valves F16 and F17.

15. Save the data, close the measurement and control software system, and turn off the power switch.

16. Collect water samples and mud samples for analysis

Collect water samples in the reactor, analyze the characteristics of the chemical composition of the water at the end of the experiment, and analyze the characteristics of microorganisms in it.

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.

17. Equipment maintenance

Clean up the inner cavity of the reactor container 12, clean the seawater container 6, the gas-liquid mixing container 7, and the microorganism container 8, and clean the pipeline through which the seawater sample passes with distilled water to prevent corrosion.

The above is only a preferred specific embodiment of the present invention, and the scope of protection of the present invention is not limited thereto. Any person familiar with the technical field within the technical scope disclosed in the present invention can obviously obtain the simplicity of the technical solution. Changes or equivalent replacements all fall within the protection scope of the present invention.

Claims (3)

1. A multifunctional simulation experiment system of hydrate under the action of microorganisms comprises 4 subsystems of a gas injection system, a liquid injection system, a simulation system, a measurement and control system and an auxiliary system, wherein the subsystems comprise:

the gas, liquid and microorganism injection system comprises a silent air compressor, a gas booster pump, a gas storage container, a natural gas source, a first flowmeter, a seawater container with a piston, a gas-liquid mixing container with a piston, a microorganism container with a piston, a pressure gauge, a advection pump, pressure regulating valves K1 and K2, control valves F1-F15 and a control valve F21; wherein,

the natural gas source, the control valve F1, the pressure regulating valve K1 and the gas inlet end of the gas booster pump are connected in sequence through pipelines; the other air inlet end of the air booster pump is connected with a mute air compressor, and the air outlet end of the air booster pump, a control valve F2, an air storage container, a control valve F3, a pressure regulating valve K2, a flowmeter, a control valve F5, a control valve F6 and an air-liquid mixing container are sequentially connected; a pipeline is branched from a connecting pipeline between the flowmeter and the control valve F5, and the branched pipeline is provided with a control valve F4; a pipeline is branched from the connecting pipeline between the control valve F5 and the control valve F6, and the branched pipeline is sequentially provided with a control valve F10 and a control valve F21; the top air outlet of the gas-liquid mixing container, the control valve F7 and the top air inlet of the seawater container are connected in sequence through pipelines;

the bottom outlet of the seawater container, the bottom outlet of the gas-liquid mixing container and the bottom outlet of the microorganism container are respectively connected with liquid inlet ends of control valves F8, F9 and F11 through pipelines, liquid outlet ends of the control valves F8, F9 and F11 are combined and connected into a path through pipelines, and the combined pipelines sequentially control a control valve F13 and a advection pump; two branch pipelines are arranged on the combined pipeline and between the control valve F11 and the control valve F13, and the two branch pipelines are respectively provided with a control valve F12 and a pressure gauge;

the liquid inlet end at the top end of the microorganism container, the control valve F14 and the control valve F15 are sequentially connected through pipelines, and the connecting pipeline between the control valve F14 and the control valve F15 is connected and communicated with the connecting pipeline between the control valve F10 and the control valve F21;

the simulation system consists of a reaction kettle, a thermostat, a pressure sensor, a vibrator, a temperature sensor, a reaction kettle window, a liquid sampling port and control valves F19 and F20 of a gas sampling port; wherein,

a reaction kettle window is arranged on the side wall of the reaction kettle, and the inside of the reaction kettle is sequentially divided into a gas layer, a seawater layer and a mud layer from top to bottom; the connecting pipeline at the air outlet end of the control valve F4, the sensing end of the temperature sensor and the sensing end of the pressure sensor extend into the air layer from the top end of the reaction kettle; the liquid inlet end of the control valve F15 is connected with the bottom of the mud layer of the reaction kettle through a pipeline; the reaction kettle, the pressure sensor, the vibrator, the temperature sensor, the control valve F19 and the control valve F20 are all arranged in the constant temperature box;

the liquid sampling port is arranged on the side wall of the seawater layer of the reaction kettle, and the gas sampling port is arranged on the side wall of the gas layer of the reaction kettle;

the measurement and control system collects real-time data of the first flowmeter, the second flowmeter, the third flowmeter, the pressure sensor, the pressure gauge, the vacuum pressure gauge, the temperature sensor and relevant flow, pressure, temperature and resistivity of the resistivity in real time, and the collected data are transmitted to the computer control system in real time, so that the computer controls the constant flow pump, the silent air compressor, the thermostat and the vacuum pump in real time to keep the normal working state of the experiment simulation system;

the flow collection is completed through a first gas flow meter, a second gas flow meter and a third gas flow meter; the first flowmeter of the inlet gas is produced by Dutch, can bear the pressure of 30MPa, measures on line, can measure instantaneous flow and accumulated flow, and has a standard 232 interface, and is automatically collected by a computer, and the type of the flowmeter is as follows: F-230M, high-range flowmeter test range: 0-100 mL/min, precision: 0.1% FS; the second flow meter is a high-range gas flow meter, and the third flow meter is a low-range gas flow meter; the outlet is connected with a high-range gas flowmeter and a low-range gas flowmeter, so that the produced gas quantity is accurately measured, and the instantaneous and accumulated flow is displayed; the types of the flowmeters are respectively as follows: DO 7-11A/ZM, DO 8-8B/ZM, working pressure: 3MPa, the measuring ranges are respectively as follows: 100mL/min,30 mL/min;

pressure collection in the reaction kettle is completed through a pressure sensor; the pressure sensor model: DG1300 range: 0-30MPa, precision: 0.1% F.S; the pressure acquisition of the injection system is completed by a pressure sensor, and the model of the pressure sensor is as follows: DG1300 range: 0-30MPa, precision: 0.1% F.S;

the temperature acquisition is completed through a temperature sensor; the test and temperature control ranges are: -15 ℃ to 90 ℃ precision: plus or minus 0.5 ℃; when the temperature is over-temperature, the system displays the temperature over-temperature alarm and automatically cuts off the power supply;

the resistivity measuring system adopts a TH2818 high-precision electric bridge and is matched with an automatic computer collector to realize the online test record of a computer; the device is used for precisely monitoring the real-time change of the resistivity in the hydrate forming process;

the data processing system consists of a data processing module and a microcomputer system; the data processing module runs in Windows2000/XP environment, adopt Delphi to programme; the working flow of the instrument is displayed on an interface, man-machine conversation is realized, an operator can be unattended after setting parameters, the computer can automatically collect pressure, flow and temperature of all monitoring points, the data collected by the computer can be processed to generate an original data report, an analysis report and a curve graph, and a database file format is generated for the flexible use of a user;

the auxiliary system consists of a methane leakage alarm monitoring system, an online sampler connected with a liquid sampling port and a gas sampling port, and a vacuum pumping system; wherein the air exhaust end of the vacuum pumping system is positioned in the gas layer of the reaction kettle;

the methane leakage alarm system is arranged at the upper part in the constant temperature box, can monitor the methane gas concentration in the constant temperature box in real time in the experimental process, and carries out gas leakage alarm when the concentration reaches a set upper limit, and simultaneously cuts off the heating power supply of the constant temperature box, thereby ensuring the safety of experimental instruments and operators;

detection range of the methane alarm device: 0-100% LEL, 0-100ppm, response time less than or equal to 30s, recovery time less than or equal to 60s, metering error less than or equal to +/-5% LEL, explosion-proof grade: exd II BT6, application temperature: -20 ℃ to 70 ℃, using humidity: RH is less than or equal to 90 percent;

the online sampler is used for sampling samples in the experimental process and analyzing the change of reactants in different experimental stages; gas sampler volume 10ml, pressure: 25 MPa; a liquid sampler: volume 5ml, pressure: 25 MPa.

2. The multifunctional simulation experiment system of hydrates under the action of microorganisms according to claim 1, wherein the effective volume of the reaction kettle is 1000ml, the diameter is 80mm, and the height is 200 mm; working pressure: 20MPa, design safety pressure: 25 MPa; working temperature: -15-90 ℃, measurement accuracy: plus or minus 0.5 ℃; the specification of the window is as follows: a visible part: 20X 100mm, and a gas-liquid-solid three-phase interface can be observed.

3. The multifunctional simulation experiment system of hydrate under action of microorganism as claimed in claim 1, wherein the vacuum pumping system comprises a vacuum pump, a vacuum pressure gauge, a control valve F18, a control valve F22 and a control valve F23 which are connected in sequence for pumping vacuum to the whole experiment system pipeline and the reaction kettle system, the vacuum pump is 2XZ-1, and the vacuum degree is 1 × 10^-1Pa。