Simulation device for in-situ negative pressure pyrolysis and oil gas collection of oil-rich coal

Abstract

The invention discloses a simulation device for oil-rich coal in-situ negative pressure pyrolysis and oil gas collection, and aims to solve the problem that multi-condition synergistic effect is not considered in oil-rich coal pyrolysis in an existing laboratory. The system comprises a pyrolysis system, an environment and pressure supply system, a condensed oil gas extraction system, a gas extraction system and a tar quality analysis system, the pyrolysis system comprises a pyrolysis cabin, a heating system is arranged in the pyrolysis cabin, the environment and pressure supply system comprises an atmosphere environment supply system and an in-situ pressure supply system, the condensed oil gas extraction system comprises an oil gas collection assembly, the gas extraction system comprises a gas analyzer and a negative pressure extraction assembly, and the tar quality analysis system comprises a rotary evaporator. The heating system, the atmosphere environment supply system, the in-situ pressure supply system, the oil gas collection assembly, the gas analyzer and the rotary evaporator are all connected with the control terminal. The simulation of the pyrolysis process of the oil-rich coal under the multi-condition synergistic effect is realized by constructing multi-condition coupling oil-rich coal pyrolysis characteristic monitoring.

Description

Technical Field

[0001] This invention relates to the field of in-situ pyrolysis technology for oil-rich coal, specifically to a simulation device for in-situ negative pressure pyrolysis and oil and gas collection of oil-rich coal. Background Technology

[0002] Oil-rich coal is a type of low-rank coal with a tar yield greater than 7% under medium- and low-temperature pyrolysis conditions. Due to its abundant reserves and large potential oil and gas resources, it has become an important component of my country's unconventional oil and gas resource development. Underground in-situ pyrolysis technology, as a crucial method for the efficient pyrolysis development of oil-rich coal, involves injecting heat into the oil-rich coal seam, causing the organic matter in the coal to decompose, thereby classifying and extracting the pyrolysis oil and gas products, achieving green and efficient development of oil and gas resources. Engineering practice has successfully extracted and separated coal tar, demonstrating the promising application prospects of this technology.

[0003] However, oil-rich coal has low thermal conductivity, limiting the locations where complete pyrolysis reactions can occur. Pyrolysis tar remains in a viscous, semi-solidified state within the coal seam or pores, affecting the actual tar recovery rate. Isothermal pyrolysis, as a primary laboratory method for studying oil-rich coal, aims to analyze its pyrolysis characteristics under different temperature conditions. Existing research indicates that enclosed spaces often exist during the pyrolysis of oil-rich coal, reflecting incomplete pyrolysis reactions and uneven heat transfer within the coal body. Therefore, simulating the heat diffusion process during coal seam pyrolysis and implementing real-time monitoring of the temperature field at multiple points can explore the relationship between temperature and the pyrolysis effect of oil-rich coal, revealing the heat transfer patterns during pyrolysis and providing crucial evidence for determining the degree of pyrolysis of oil-rich coal in a regionalized manner.

[0004] During pyrolysis, oil-rich coal often exhibits characteristics such as low permeability and high porosity. Its pyrolysis oil and gas can diffuse along the pores and fissures. However, due to the anisotropic thermal conductivity of the coal, temperature differences exist in different regions of the coal. Oil and gas are prone to condensation or stagnation when passing through lower-temperature areas during migration. Furthermore, with the development of deep coal seams, the pore structure gradually becomes denser, reducing the free migration capacity of oil and gas. The reduced driving force of oil and gas within the pipeline also obstructs flow, easily leading to condensation and accumulation. To address these issues, negative pressure extraction technology can increase the thermal driving force of oil and gas by adjusting the vacuum level, achieving rapid heat and oil-gas transfer and improving tar condensation.

[0005] If a technical device integrating real-time monitoring of the pyrolysis temperature field of oil-rich coal seams and negative pressure extraction of oil and gas can be constructed, it can simulate the in-situ pyrolysis process of oil-rich coal in well drilling. It can also systematically explore the influence of the coupling effect of parameters such as temperature and vacuum degree on the generation and migration mechanism of pyrolysis oil and gas, providing a theoretical basis for in-situ pyrolysis in well drilling, and realizing the efficient extraction of pyrolysis products and high-value utilization of resources.

[0006] However, existing research largely focuses on the mechanism exploration and yield prediction analysis of laboratory-scale oil-rich coal pyrolysis, lacking simulation studies of multi-condition synergistic pyrolysis processes of oil-rich coal in underground mines. In particular, the synergistic effect of temperature and vacuum on tar recovery and its migration mechanism remains unclear. Therefore, developing a system based on underground in-situ pyrolysis that can monitor the dynamic evolution of the temperature field and oil and gas collection of oil-rich coal pyrolysis under negative pressure extraction conditions in real time is essential for improving the efficiency of oil-rich coal pyrolysis and tar recovery. Summary of the Invention

[0007] To address the aforementioned problems in the prior art, this invention provides a simulation device for in-situ negative pressure pyrolysis and oil and gas collection of oil-rich coal, which solves the problem that existing laboratory pyrolysis of oil-rich coal does not consider the synergistic effect of multiple conditions.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A simulation device for in-situ negative pressure pyrolysis and oil and gas collection of oil-rich coal is provided, comprising: The pyrolysis system includes a pyrolysis chamber; a heating system is installed inside the pyrolysis chamber. The environment and pressure supply system includes an atmosphere environment supply system connected to the pyrolysis chamber to simulate different atmospheric environments, and an in-situ pressure supply system connected to the pyrolysis chamber to simulate in-situ stress environments. The condensate oil and gas extraction system includes an oil and gas collection component, which is connected to the pyrolysis chamber via an oil and gas transmission pipe, and a condensation component is installed between the oil and gas transmission pipe and the oil and gas collection component. The gas extraction system includes a gas analyzer connected to a signal and a negative pressure extraction component, which is connected to the oil and gas collection component. The tar quality analysis system includes a rotary evaporator, which is connected to an oil and gas collection assembly. The heating system, atmosphere supply system, in-situ pressure supply system, oil and gas collection components, gas analyzer, and rotary evaporator are all connected to the control terminal.

[0009] This invention constructs an integrated device for monitoring the pyrolysis characteristics and analyzing the products of oil-rich coal under multiple coupled conditions (temperature-pressure-vacuum). This device enables real-time control of product generation during pyrolysis, real-time monitoring of the pyrolysis reaction process, and real-time regulation of oil and gas migration. It also simulates the pyrolysis process of oil-rich coal under the synergistic effect of multiple conditions, providing a theoretical basis for improving the pyrolysis efficiency of oil-rich coal and the actual recovery rate of oil and gas.

[0010] Furthermore, the pyrolysis chamber is hollow inside, with transverse sealing walls at the top and bottom, and an annular sealing wall between the two transverse sealing walls; a pyrolysis cavity for placing the coal sample to be pyrolyzed is formed between the two transverse sealing walls and the annular sealing wall.

[0011] Furthermore, the heating system includes a single-section heating rod, a two-section heating rod, and a three-section heating rod placed in the pyrolysis chamber, as well as several first thermocouples placed in layers in the pyrolysis chamber. The single-section heating rod, the two-section heating rod, the three-section heating rod, and the first thermocouples are all connected to the temperature monitoring controller signal; the temperature monitoring controller is connected to the control terminal signal.

[0012] Furthermore, the atmosphere supply system includes atmosphere cylinders on both sides, which are connected to the bottom of the pyrolysis chamber via atmosphere pipes; a first flow meter is installed on the atmosphere pipes, and the first flow meter is connected to the control terminal signal.

[0013] Furthermore, the in-situ pressure supply system includes confining pressure cylinders on both sides and an axial pressure control box; the confining pressure cylinders are connected to the pyrolysis chamber through injection pipes; the axial pressure control box is connected to the pyrolysis chamber through two hydraulic pipes; and the axial pressure control box is connected to the control terminal signal.

[0014] Furthermore, the oil and gas collection assembly includes a water bath and an oil and gas collection box placed inside the water bath; a first gravity sensor is installed at the bottom of the water bath and is connected to a gravity controller; the gravity controller is connected to a control terminal signal.

[0015] Furthermore, the condensation assembly includes a constant temperature water bath and a condenser tube; one end of the condenser tube is connected to the oil and gas collection box, and the other end of the condenser tube is connected to the oil and gas transmission pipe. The outlet of the constant temperature water bath is connected to the inlet of the water bath, the outlet of the water bath is connected to the condenser inlet of the condenser tube, and the condenser outlet of the condenser tube is connected to the inlet of the constant temperature water bath. The oil and gas transmission pipeline is equipped with a second flow meter and a second thermocouple. The second thermocouple is connected to the temperature monitoring controller signal; the second flow meter is connected to the control terminal signal.

[0016] Furthermore, the negative pressure extraction assembly includes a gas observation box and a gas collection box, which are connected by a fan; The gas observation box's inlet is connected to the outlet of the oil and gas collection box via a pipe; the gas collection box is equipped with a pressure gauge and a first gas sensor; the gas observation box is equipped with a second gas sensor; both the first and second gas sensors are connected to the gas analyzer signal; the fan is connected to the speed regulation device signal; the gas analyzer and the speed regulation device are both connected to the control terminal signal.

[0017] Furthermore, the oil-water separation tube of the rotary evaporator is connected to the oil outlet of the oil-gas collection box via a pipe, and a second gravity sensor is installed at the bottom of the water collection bottle of the rotary evaporator, which is connected to the gravity controller.

[0018] This invention discloses a simulation device for in-situ negative pressure pyrolysis and oil and gas collection of oil-rich coal, the beneficial effects of which are: 1. This invention constructs an integrated device for monitoring the pyrolysis characteristics and analyzing the products of oil-rich coal under multiple coupled conditions (temperature-pressure-vacuum). This device enables real-time control of product generation during pyrolysis, real-time monitoring of the pyrolysis reaction process, and real-time regulation of oil and gas migration. It also simulates the pyrolysis process of oil-rich coal under the synergistic effect of multiple conditions, providing a theoretical basis for improving the pyrolysis efficiency of oil-rich coal and the actual recovery rate of oil and gas.

[0019] 2. By setting up a negative pressure extraction system, this invention changes the negative pressure conditions of the pyrolysis environment of oil-rich coal, enabling real-time monitoring and analysis of the migration rate of pyrolysis oil and gas. It reveals the regulatory mechanism of negative pressure extraction on the generation and migration of oil and gas in oil-rich coal pyrolysis, and improves the phenomenon of oil and gas retention in oil-rich coal.

[0020] 3. This invention simulates the in-situ atmosphere of oil-rich coal underground by setting up an environment and pressure supply system, and explores the influence of pyrolysis atmosphere on heat transfer path and product formation in the thermal reaction of oil-rich coal, providing a theoretical basis for real-time control of oil-rich coal pyrolysis products. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a simulation device for in-situ negative pressure pyrolysis and oil and gas collection of oil-rich coal according to the present invention.

[0022] Figure 2 This is a schematic diagram of the pyrolysis chamber of the present invention.

[0023] Figure 3 This is a schematic diagram of the environmental and pressure supply system of the present invention.

[0024] Figure 4 This is a schematic diagram of the structure of the oil and gas collection assembly and condensation assembly of the present invention.

[0025] Figure 5 This is a schematic diagram of the gas extraction system of the present invention.

[0026] Figure 6 This is a schematic diagram of the rotary evaporator of the present invention.

[0027] Among them, 1. pyrolysis chamber; 11. transverse enclosed wall; 12. annular enclosed wall; 2. Heating system; 21. Single-section heating rod; 22. Two-section heating rod; 23. Three-section heating rod; 24. First thermocouple; 25. Temperature monitoring and controller; 3. Atmosphere supply system; 31. Atmosphere cylinder; 32. Atmosphere pipeline; 33. First flow meter; 4. In-situ pressure supply system; 41. Confining pressure cylinder; 42. Axial pressure control box; 43. Gas injection pipeline; 44. Hydraulic pipe; 5. Oil and gas collection assembly; 51. Water bath tank; 52. Oil and gas collection box; 53. First gravity sensor; 54. Gravity controller; 6. Oil and gas transmission pipe; 61. Second flow meter; 62. Second thermocouple; 7. Condensing assembly; 71. Constant temperature water bath; 72. Condensing tube; 81. Gas analyzer; 82. Gas observation box; 83. Gas collection box; 84. Fan; 85. Pressure gauge; 86. First gas sensor; 87. Second gas sensor; 88. Speed ​​regulation device; 9. Rotary evaporator; 91. Second gravity sensor; 10. Control terminal. Detailed Implementation The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0028] Example 1 refer to Figures 1-2 This embodiment provides a simulation device for in-situ negative pressure pyrolysis and oil and gas collection of oil-rich coal. Its purpose is to solve the problem that existing laboratory pyrolysis of oil-rich coal does not consider the synergistic effect of multiple conditions. The specific structure of this embodiment will be described in detail below.

[0029] A simulation device for in-situ negative pressure pyrolysis and oil and gas collection of oil-rich coal includes a pyrolysis system, an environment and pressure supply system, a condensate oil and gas extraction system, a gas extraction system, a tar quality analysis system, and a control terminal 10. The pyrolysis system includes a pyrolysis chamber 1, in which a heating system 2 is installed; the environment and pressure supply system includes an atmosphere environment supply system 3 connected to the pyrolysis chamber 1 to simulate different atmosphere environments, and an in-situ pressure supply system 4 connected to the pyrolysis chamber 1 to simulate in-situ stress environments.

[0030] Specifically, the condensate oil and gas extraction system includes an oil and gas collection component 5, which is connected to the pyrolysis chamber 1 via an oil and gas transmission pipe 6, and a condensation component 7 is provided between the oil and gas transmission pipe 6 and the oil and gas collection component 5. The gas extraction system includes a gas analyzer 81 connected to a signal and a negative pressure extraction component, which is connected to the oil and gas collection component 5. The tar quality analysis system includes a rotary evaporator 9, which is connected to the oil and gas collection assembly 5; Heating system 2, atmosphere supply system 3, in-situ pressure supply system 4, oil and gas collection assembly 5, gas analyzer 81 and rotary evaporator 9 are all connected to control terminal 10.

[0031] In this embodiment, the coal sample to be pyrolyzed is placed in the pyrolysis chamber 1. The heating system 2 provides temperature support to the coal sample in the pyrolysis chamber 1. The environment and pressure supply system provides a simulation of the in-situ atmosphere and in-situ stress (pressure) environment of oil-rich coal to the coal sample in the pyrolysis chamber 1.

[0032] Under the coupled and synergistic effect of multiple conditions, the coal sample to be pyrolyzed undergoes a pyrolysis reaction. The oil and gas collection component 5 collects the oil and gas generated by pyrolysis through the oil and gas transmission pipe 6. The pyrolysis gaseous products are collected and analyzed through the negative pressure extraction system. The oil-water mixture is collected by the rotary evaporator 9 and separated into oil and water by rotary evaporation to obtain tar. Finally, the data is collected to the control terminal 10 to realize the real-time control of product generation during pyrolysis, the real-time monitoring of the pyrolysis reaction process, and the real-time regulation of oil and gas migration. This enables the simulation of the pyrolysis process of oil-rich coal under the synergistic effect of multiple conditions, providing a theoretical basis for improving the pyrolysis efficiency of oil-rich coal and the actual recovery rate of oil and gas.

[0033] Optionally, the control terminal 10 can be a computer.

[0034] Specifically, the pyrolysis chamber 1 is hollow inside, and transverse sealing walls 11 are respectively set at the top and bottom of the hollow interior. An annular sealing wall 12 is set between the two transverse sealing walls 11. A pyrolysis cavity for placing coal samples to be pyrolyzed is formed between the two transverse sealing walls 11 and the annular sealing wall 12.

[0035] In this embodiment, the transverse enclosed wall 11 adopts a circular composite structure, mainly using 316 stainless steel metal body for support, with a layer of mica board attached or sandwiched on the bottom for heat insulation.

[0036] The annular closed wall 12 adopts a composite cylindrical hollow sleeve structure, mainly made of 316 stainless steel. From the outside to the inside, it consists of: a stainless steel hollow closed ring, a phlogopite ring, and a metal corrugated expansion ring. The inner walls of the stainless steel hollow closed ring and the phlogopite ring are symmetrically perforated, and the metal corrugated expansion ring is placed at the position in contact with the sample, providing the required lateral pressure by laterally compressing the sample.

[0037] Optionally, the outer casing of the pyrolysis chamber 1 is equipped with a sealed cover to ensure a sealed atmosphere.

[0038] Specifically, the heating system 2 includes a single-section heating rod 21, a two-section heating rod 22, and a three-section heating rod 23 placed in the pyrolysis chamber, as well as several first thermocouples 24 placed in layers in the pyrolysis chamber. The single-section heating rod 21, the two-section heating rod 22, the three-section heating rod 23, and the first thermocouples 24 are all connected to the temperature monitoring controller 25. The temperature monitoring controller 25 is connected to the control terminal 10.

[0039] In this embodiment, the temperature monitoring controller 25 uses an existing paperless recorder. Specifically, it is model THW48. A single-section heating rod 21, a two-section heating rod 22, and a three-section heating rod 23 are distributed within the coal sample to be pyrolyzed in the pyrolysis chamber. The temperature monitoring controller 25 controls the activation and deactivation of the single-section heating rod 21, the two-section heating rod 22, and the three-section heating rod 23 to simulate the multi-region pyrolysis of oil-rich coal seams, thereby simulating the heat conduction characteristics of oil-rich coal at different temperatures.

[0040] Several first thermocouples 24 are arranged in layers from top to bottom to provide real-time acquisition of coal seam temperature signals. The several first thermocouples 24 can collect the temperature of the coal sample to be pyrolyzed in layers and collect the collected information to the temperature monitoring controller 25. The temperature monitoring controller 25 transmits the collected temperature information to the control terminal 10.

[0041] Example 2 refer to Figure 3 This embodiment provides a further solution for the environmental and pressure supply system, the purpose of which is to solve the problem of atmosphere simulation in existing laboratory oil-rich coal pyrolysis. The specific structure of this embodiment will be described in detail below.

[0042] The environment and pressure supply system includes an atmosphere environment supply system 3 connected to the pyrolysis chamber 1 to simulate different atmospheric environments, and an in-situ pressure supply system 4 connected to the pyrolysis chamber 1 to simulate in-situ stress environments.

[0043] Specifically, the atmosphere supply system 3 includes atmosphere cylinders 31 on both sides, and the atmosphere cylinders 31 are connected to the bottom of the pyrolysis chamber through atmosphere pipes 32; a first flow meter 33 is installed on the atmosphere pipes 32, and the first flow meter 33 is connected to the control terminal 10 by signal.

[0044] In this embodiment, the atmosphere cylinder 31 contains inert gas, and two cylinders are arranged on both sides of the pyrolysis chamber 1. Each atmosphere cylinder 31 is connected to the bottom of the pyrolysis chamber through an atmosphere pipe 32. The inert gas in the atmosphere cylinder 31 is filled into the pyrolysis chamber to simulate different environmental atmospheres rich in oil and coal. The first flow meter 33 collects the inert gas filling flow rate and transmits the collected flow information to the control terminal 10.

[0045] Specifically, the in-situ pressure supply system 4 includes confining pressure cylinders 41 on both sides and an axial pressure control box 42; the confining pressure cylinders 41 are connected to the pyrolysis chamber through the gas injection pipe 43; the axial pressure control box 42 is connected to the pyrolysis chamber through two hydraulic pipes 44; the axial pressure control box 42 is connected to the control terminal 10 via signal.

[0046] In this embodiment, the axial pressure control box 42 adopts an existing gantry H-frame hydraulic press. Its specific model is YL-200t. The pressurized hydraulic oil in the axial pressure control box 42 is delivered to the oil cylinder, the oil cylinder pushes the piston to move downward, and the piston transmits the pressure to the transverse closed wall 11 through two small sliders.

[0047] The confining pressure gas cylinder 41 contains compressed gas, and there are two cylinders arranged on both sides of the pyrolysis chamber 1. Each confining pressure gas cylinder 41 is connected to the pyrolysis chamber through a gas injection pipe 43. The compressed gas in the confining pressure gas cylinder 41 is injected into the pyrolysis chamber to simulate different stress (pressure) environments of oil-rich coal.

[0048] Optionally, both the atmosphere gas cylinder 31 and the confining pressure gas cylinder 41 are equipped with pressure dividing valves.

[0049] Example 3 refer to Figure 4 This embodiment provides a further solution for the oil and gas collection component 5, the purpose of which is to solve the problem of pyrolysis oil and gas collection. The specific structure of this embodiment will be described in detail below.

[0050] The oil and gas collection assembly 5 includes a water bath tank 51 and an oil and gas collection box 52 placed inside the water bath tank 51; a first gravity sensor 53 is provided at the bottom of the water bath tank 51, and the first gravity sensor 53 is connected to a gravity controller 54; the gravity controller 54 is connected to the control terminal 10 via a signal.

[0051] Specifically, the condenser assembly 7 includes a constant temperature water bath 71 and a condenser tube 72; one end of the condenser tube 72 is connected to the oil and gas collection box 52, and the other end of the condenser tube 72 is connected to the oil and gas transmission pipe 6; the outlet of the constant temperature water bath 71 is connected to the inlet of the water bath 51, the outlet of the water bath 51 is connected to the condenser inlet of the condenser tube 72, and the condenser outlet of the condenser tube 72 is connected to the inlet of the constant temperature water bath 71; a second flow meter 61 and a second thermocouple 62 are installed on the oil and gas transmission pipe 6, and the second thermocouple 62 is connected to the temperature monitoring controller 25; the second flow meter 61 is connected to the control terminal 10.

[0052] In this embodiment, the gravity controller 54 adopts the existing Feiya Laboratory mass reading system. Specifically, it is a TSC counting, weighing, and pricing scale. The gravity controller 54 is connected to the control terminal 10 via IP, and the control terminal 10 uses the gravity controller 54 to achieve real-time acquisition of mass changes.

[0053] When needed, the first gravity sensor 53 can also be directly electrically connected to the control terminal 10 to transmit the collected mass information to the control terminal 10.

[0054] One end of the oil and gas transmission pipe 6 is connected to the pyrolysis chamber, and the other end is connected to the oil and gas collection box 52 through the condenser pipe 72. The flow rate and temperature information of the pyrolysis products passing through the oil and gas transmission pipe 6 are collected by the second flow meter 61 and the second thermocouple 62. The flow rate information is transmitted to the control terminal 10, and the temperature information is transmitted to the temperature monitoring controller 25.

[0055] The constant temperature medium flows out from the outlet of the constant temperature water bath 71, enters the water bath 51 through the inlet, flows out from the outlet of the water bath 51, enters the condenser tube 72 through the condenser inlet, and then flows out from the condenser outlet of the condenser tube 72. Thus, it enters the constant temperature water bath 71 through the inlet, thereby forming a constant temperature condensing water bath circulation, which condenses the pyrolysis oil and gas flowing through the condenser tube 72.

[0056] The pyrolysis products after condensation are placed in the oil and gas collection box 52. The weight information of the pyrolysis products placed in the oil and gas collection box 52 is collected by the first gravity sensor 53 at the bottom of the water bath 51 and transmitted to the control terminal 10.

[0057] Example 4 refer to Figures 5-6 This embodiment provides a further solution for the negative pressure extraction component and the rotary evaporator, the purpose of which is to solve the problem of collecting pyrolysis gaseous products and oil-water mixtures in pyrolysis oil and gas. The specific structure of this embodiment will be described in detail below.

[0058] The negative pressure extraction assembly includes a gas observation box 82 and a gas collection box 83, which are connected by a fan 84. Specifically, the air inlet of the gas observation box 82 is connected to the air outlet of the oil and gas collection box 52 through a pipe; the gas collection box 83 is equipped with a pressure gauge 85 and a first gas sensor 86; the gas observation box 82 is equipped with a second gas sensor 87; both the first gas sensor 86 and the second gas sensor 87 are connected to the gas analyzer 81; the fan 84 is connected to the speed regulation device 88; both the gas analyzer 81 and the speed regulation device 88 are connected to the control terminal 10.

[0059] In this embodiment, the speed regulation device 88 uses an existing Schneider Altivar frequency converter, specifically the ATV320. The speed regulation device 88 adjusts the speed of the three-phase induction motor by changing the output voltage and frequency, thereby controlling the airflow and negative pressure generated by the fan. It can also be combined with a differential pressure signal to achieve closed-loop constant negative pressure control. The gas analyzer 81 uses an existing FLIR Griffin G510 portable gas chromatography-mass spectrometry (GC-MS) system, specifically the G510 model. The sample gas enters the gas chromatography column (GC) inside the device, where different gas components are separated based on their retention time differences. The gas then sequentially enters a mass spectrometer (MS) detector. The mass spectrometer generates characteristic fragment ions through ionization, which are compared with a built-in database for qualitative identification. Gas concentration is quantitatively analyzed using mass spectrometry peak area.

[0060] The gas observation box 82 creates a negative pressure environment through the fan 84, which allows the gas observation box 82 to extract the pyrolysis gaseous products of the oil and gas collection box 52 through the pipeline. The second gas sensor 87 collects the information inside the gas observation box 82 and transmits the collected information to the gas analyzer 81. After analysis, the gas analyzer 81 obtains the analysis results and transmits the results information to the control terminal 10.

[0061] The fan 84 continues to operate, drawing the pyrolysis gaseous products in the gas observation box 82 into the gas collection box 83. The first gas sensor 86 collects information from the gas observation box 82 and transmits the collected information to the gas analyzer 81. The gas analyzer 81 analyzes the information and transmits the results to the control terminal 10.

[0062] Specifically, the oil-water separation pipe of the rotary evaporator 9 is connected to the oil outlet of the oil and gas collection box 52 via a pipe, and a second gravity sensor 91 is installed at the bottom of the water collection bottle of the rotary evaporator 9. The second gravity sensor 91 is connected to the gravity controller 54.

[0063] In this embodiment, the rotary evaporator 9 is an existing rotary evaporator, specifically model RE-201D. The rotary evaporator uses a vacuum system to reduce pressure, causing water to boil at a lower temperature. The evaporation flask rotates under the drive of a motor. The oil-water mixture inside the flask is heated by a water bath, and the water vaporizes and is then cooled and liquefied by a condenser before flowing into a recovery flask, thereby achieving the separation and recovery of tar and water.

[0064] The oil-water separation tube of the rotary evaporator 9 is connected to the oil outlet of the oil and gas collection box 52 through a pipe to extract the oil-water mixture of pyrolysis products in the oil and gas collection box 52. The tar in the oil-water mixture is decomposed by the rotary evaporator 9 and collected into the tar evaporation flask of the rotary evaporator 9.

[0065] A second gravity sensor 91 is installed at the bottom of the water collection bottle of the rotary evaporator 9. The weight information of the water is collected by the second gravity sensor 91 and transmitted to the gravity controller 54 to finally obtain the weight of the tar.

[0066] When needed, the second gravity sensor 91 can also be directly electrically connected to the control terminal 10 to transmit the collected mass information to the control terminal 10.

[0067] Although specific embodiments of the invention have been described in detail with reference to the accompanying drawings, this should not be construed as limiting the scope of protection of this patent. Various modifications and variations that can be made by a person skilled in the art without inventive effort within the scope described in the claims still fall within the scope of protection of this patent.

Claims

1. A simulation device for in-situ negative pressure pyrolysis and oil and gas collection of oil-rich coal, characterized in that, include: A pyrolysis system, comprising a pyrolysis chamber (1); a heating system (2) is provided inside the pyrolysis chamber (1). An environment and pressure supply system, comprising an atmosphere environment supply system (3) connected to the pyrolysis chamber (1) to simulate different atmosphere environments, and an in-situ pressure supply system (4) connected to the pyrolysis chamber (1) to simulate in-situ stress environments. A condensed oil and gas extraction system includes an oil and gas collection component (5), which is connected to the pyrolysis chamber (1) through an oil and gas transmission pipe (6), and a condensation component (7) is provided between the oil and gas transmission pipe (6) and the oil and gas collection component (5). A gas extraction system, comprising a gas analyzer (81) connected to a signal and a negative pressure extraction assembly, wherein the negative pressure extraction assembly is connected to an oil and gas collection assembly (5); A tar quality analysis system, comprising a rotary evaporator (9) connected to an oil and gas collection assembly (5); The heating system (2), atmosphere supply system (3), in-situ pressure supply system (4), oil and gas collection assembly (5), gas analyzer (81) and rotary evaporator (9) are all connected to the control terminal (10).

2. The simulation device for in-situ negative pressure pyrolysis and oil and gas collection of oil-rich coal according to claim 1, characterized in that: The pyrolysis chamber (1) is hollow inside, and transverse sealing walls (11) are respectively provided at the top and bottom of the hollow interior. An annular sealing wall (12) is provided between the two transverse sealing walls (11). A pyrolysis cavity for placing coal samples to be pyrolyzed is formed between the two transverse sealing walls (11) and the annular sealing wall (12).

3. The simulation device for in-situ negative pressure pyrolysis and oil and gas collection of oil-rich coal according to claim 2, characterized in that: The heating system (2) includes a single-section heating rod (21), a two-section heating rod (22), and a three-section heating rod (23) placed in the pyrolysis chamber, as well as several first thermocouples (24) placed in layers in the pyrolysis chamber. The single-section heating rod (21), the two-section heating rod (22), the three-section heating rod (23), and the first thermocouples (24) are all connected to the temperature monitoring controller (25) via signal. The temperature monitoring controller (25) is connected to the control terminal (10) via signal.

4. The simulation device for in-situ negative pressure pyrolysis and oil and gas collection of oil-rich coal according to claim 2, characterized in that: The atmosphere supply system (3) includes atmosphere cylinders (31) on both sides. The atmosphere cylinders (31) are connected to the bottom of the pyrolysis chamber through an atmosphere pipe (32). A first flow meter (33) is installed on the atmosphere pipe (32). The first flow meter (33) is connected to the control terminal (10) by signal.

5. The simulation device for in-situ negative pressure pyrolysis and oil and gas collection of oil-rich coal according to claim 2, characterized in that: The in-situ pressure supply system (4) includes confining pressure cylinders (41) on both sides and an axial pressure control box (42); the confining pressure cylinders (41) are connected to the pyrolysis chamber through an injection pipe (43); the axial pressure control box (42) is connected to the pyrolysis chamber through two hydraulic pipes (44); the axial pressure control box (42) is connected to the control terminal (10) via a signal.

6. The simulation device for in-situ negative pressure pyrolysis and oil and gas collection of oil-rich coal according to claim 1, characterized in that: The oil and gas collection assembly (5) includes a water bath (51) and an oil and gas collection box (52) placed inside the water bath (51); a first gravity sensor (53) is provided at the bottom of the water bath (51), and the first gravity sensor (53) is connected to a gravity controller (54); the gravity controller (54) is connected to a control terminal (10) via a signal.

7. The simulation device for in-situ negative pressure pyrolysis and oil and gas collection of oil-rich coal according to claim 6, characterized in that: The condensation assembly (7) includes a constant temperature water bath (71) and a condenser tube (72); one end of the condenser tube (72) is connected to the oil and gas collection box (52), and the other end of the condenser tube (72) is connected to the oil and gas transmission pipe (6); The outlet of the constant temperature water bath (71) is connected to the inlet of the water bath (51), the outlet of the water bath (51) is connected to the condenser inlet of the condenser tube (72), and the condenser outlet of the condenser tube (72) is connected to the inlet of the constant temperature water bath (71). The oil and gas transmission pipe (6) is equipped with a second flow meter (61) and a second thermocouple (62). The second thermocouple (62) is connected to the temperature monitoring controller (25) by signal; the second flow meter (61) is connected to the control terminal (10) by signal.

8. The simulation device for in-situ negative pressure pyrolysis and oil and gas collection of oil-rich coal according to claim 6, characterized in that: The negative pressure extraction assembly includes a gas observation box (82) and a gas collection box (83), which are connected by a fan (84). The air inlet of the gas observation box (82) is connected to the air outlet of the oil and gas collection box (52) through a pipe; the gas collection box (83) is equipped with a pressure gauge (85) and a first gas sensor (86); the gas observation box (82) is equipped with a second gas sensor (87); both the first gas sensor (86) and the second gas sensor (87) are connected to the gas analyzer (81); the fan (84) is connected to the speed regulation device (88). The gas analyzer (81) and the speed regulating device (88) are both connected to the control terminal (10) via signals.

9. The simulation device for in-situ negative pressure pyrolysis and oil and gas collection of oil-rich coal according to claim 6, characterized in that: The oil-water separation pipe of the rotary evaporator (9) is connected to the oil outlet of the oil and gas collection box (52) through a pipe; a second gravity sensor (91) is provided at the bottom of the water collection bottle of the rotary evaporator (9), and the second gravity sensor (91) is connected to the gravity controller (54).

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