Method for monitoring and evaluating in-situ pyrolysis reaction degree of oil-rich coal

Abstract

The invention discloses a method for monitoring and evaluating the in-situ pyrolysis reaction degree of oil-rich coal in the field of energy engineering, which comprises the following specific steps of: 1, sampling an oil-rich coal seam, performing a pyrolysis experiment on a sample by using an experimental device, and taking experimental data as standard data for evaluation; 2, establishing a three-dimensional geological model by using three-dimensional geological modeling and geological exploration data; 3, performing numerical simulation of a pyrolytic reaction process on the three-dimensional geologic model in combination with experimental data; 4, selecting a proper monitoring point to install a monitoring module according to a simulation result; and 5, comparing and analyzing the monitoring data and the standard data, and evaluating the pyrolytic reaction degree of the oil-rich coal seam. By combining laboratory experiments, three-dimensional geological modeling, numerical simulation and on-site real-time monitoring technologies, comprehensive and dynamic monitoring and evaluation of the in-situ pyrolysis process of the oil-rich coal are realized, a scientific basis is provided for optimization and adjustment of pyrolysis operation, and efficient and environment-friendly exploitation of resources is ensured.

Description

Technical Field

[0001] The present invention belongs to the field of energy engineering, and particularly relates to a method for monitoring and evaluating the degree of in-situ pyrolysis reaction of rich oil coal. Background Art

[0002] In the energy field, rich oil coal, as an important unconventional energy source, its efficient and environmentally friendly mining and utilization technologies have always been a research hotspot. As one of the methods with broad application prospects, the in-situ pyrolysis technology injects high-temperature heat carriers (such as supercritical water, superheated steam, or superheated hydrocarbon gases, etc.) directly into the underground coal seam, and uses the heat energy of these heat carriers to promote the pyrolysis reaction of organic matter in the coal seam under high temperature and high pressure conditions, thereby generating oil and gas resources. This technology not only reduces the complexity and cost of surface dry distillation projects, but also expands the range of recoverable depths of coal resources. At the same time, it helps to reduce overall carbon emissions and avoid surface subsidence problems that may be caused by traditional mining methods.

[0003] However, although the in-situ pyrolysis technology has many advantages, it also faces a series of challenges in the application process. The most critical one is how to accurately monitor and evaluate the degree of pyrolysis reaction of underground rich oil coal resources. Since the pyrolysis process occurs in a closed underground environment and the coal seam is usually located deep underground, it is extremely difficult to directly observe and evaluate its pyrolysis state in real time.

[0004] Traditional monitoring methods often rely on ground drilling sampling, that is, samples are taken from underground and sent to the laboratory for chemical analysis. This method has significant limitations: since the underground pyrolysis process is a dynamically changing system, the time difference between sampling and sending to the laboratory may cause the analysis results to not accurately reflect the current pyrolysis state. This may not only lead to the cessation of heat injection and extraction operations before complete pyrolysis, resulting in waste of underground resources; but also misjudge the degree of pyrolysis reaction, such as misjudging incomplete pyrolysis caused by heat leakage or other reasons as approaching termination, thus prematurely stopping the operation; or misjudging the reduction of pyrolysis products caused by other reasons when the pyrolysis reaction is approaching the final stage as other reasons, resulting in unnecessary resource waste. Moreover, the heterogeneity of the coal seam makes it difficult for single or a few samplings to comprehensively reflect the pyrolysis situation of the entire coal seam, which may lead to deviation of the evaluation results.

[0005] Therefore, the present invention proposes a method for monitoring and evaluating the degree of in-situ pyrolysis reaction of rich oil coal to solve the above problems. Summary of the Invention

[0006] The present invention provides a method for monitoring and evaluating the in-situ pyrolysis reaction degree of rich oil coal. By combining laboratory experiments, three-dimensional geological modeling, numerical simulation, and on-site real-time monitoring techniques, it realizes the comprehensive and dynamic monitoring and evaluation of the in-situ pyrolysis process of rich oil coal, provides a scientific basis for the optimization and adjustment of pyrolysis operations, and ensures the efficient and environmentally friendly exploitation of resources.

[0007] To achieve the above object, the technical solution of the present invention is as follows: A method for monitoring and evaluating the in-situ pyrolysis reaction degree of rich oil coal, and the specific steps are as follows:

[0008] Step 1: Sample the rich oil coal seam that needs to be pyrolyzed in-situ, and use an experimental device to conduct pyrolysis experiments on the collected samples. Take the experimental data of the samples as the standard data for evaluation.

[0009] Step 2: Use three-dimensional geological modeling technology, combined with geological exploration data, to establish a three-dimensional geological model of the rich oil coal seam.

[0010] Step 3: Combine the experimental data in Step 1 to conduct numerical simulation of the pyrolysis reaction process on the three-dimensional geological model in Step 2, and simulate the pyrolysis reaction paths and product distributions under different conditions.

[0011] Step 4: According to the simulation results in Step 3, select appropriate monitoring points in the rich oil coal seam area and install monitoring modules. The monitoring modules are used to collect the parameters of the rich oil coal seam during pyrolysis in real time.

[0012] Step 5: Compare and analyze the monitoring data in Step 4 with the standard data in Step 1 to evaluate the pyrolysis reaction degree of the rich oil coal seam.

[0013] After adopting the above solution, the following beneficial effects are achieved:

[0014] 1. By conducting pyrolysis experiments on rich oil coal seam samples in the laboratory, accurate standard data are obtained, providing a solid theoretical basis and data support for subsequent numerical simulation and on-site monitoring. This evaluation method based on experimental data greatly enhances the scientificity and accuracy of the evaluation results.

[0015] 2. Using three-dimensional geological modeling technology, combined with geological exploration data, a three-dimensional geological model of the rich oil coal seam is established, enabling a more comprehensive and intuitive understanding of the structure, distribution, and pyrolysis conditions of the coal seam. This visual model not only facilitates analysis by researchers but also improves the accuracy of decision-making.

[0016] 3. Through numerical simulation technology, it is possible to simulate the pyrolysis reaction paths and product distributions under different conditions, providing a powerful tool for predicting the pyrolysis behavior of rich oil coal seams. This predictive ability helps to plan the mining scheme in advance, optimize the pyrolysis process parameters, and thus improve the resource utilization efficiency.

[0017] 4. Install the monitoring module at appropriate monitoring points in the rich oil coal seam area to achieve real-time data collection during the pyrolysis process. This real-time monitoring mechanism enables researchers to promptly detect abnormal conditions during the pyrolysis process and dynamically adjust the pyrolysis conditions based on the monitoring data to ensure the safety and effectiveness of the pyrolysis process.

[0018] 5. Comparing and analyzing the monitoring data with standard data can accurately evaluate the degree of pyrolysis reaction of the rich oil coal seam, providing a scientific basis for subsequent mining decisions and resource management. At the same time, through continuous monitoring and evaluation, the pyrolysis process can be continuously optimized to improve the resource conversion rate and economic benefits.

[0019] 6. The method of the present invention emphasizes the precise control and monitoring of the pyrolysis process, which helps to reduce pollutant emissions during the pyrolysis process and improve the environmental friendliness of resource utilization. At the same time, by optimizing the pyrolysis process, the mining life of the rich oil coal seam can be extended, promoting the sustainable utilization of coal resources.

[0020] Furthermore, the experimental device in step one includes a pyrolysis component, a condensation component, a gas collection component, and a controller. The pyrolysis component includes a ring-type resistance furnace, inside which a stainless-steel reactor is installed. A thermocouple is installed between the ring-type resistance furnace and the stainless-steel reactor. The condensation component includes a conical flask and a condensation water bath. The conical flask is detachably connected to the condensation water bath. The conical flask is communicated with the stainless-steel reactor. The conical flask is communicated with a drying tube, and one end of the drying tube far from the conical flask is communicated with the gas collection component. The thermocouple is signal-connected to the controller, and the controller controls the opening and closing of the thermocouple.

[0021] Beneficial effects: The ring-type resistance furnace serves as a heat source, capable of providing a stable and uniform heat field to ensure that the sample is evenly heated during the pyrolysis process. At the same time, the temperature inside the stainless-steel reactor is real-time monitored by the thermocouple and the signal is transmitted to the controller, achieving precise control of the pyrolysis temperature. The conical flask is cooled by the condensation water bath, effectively condensing the volatile products generated by pyrolysis into liquids or solids. The setting of the drying tube further removes the moisture entrained in the condensation products, improving the purity of the products and the accuracy of subsequent analysis. The gas collection component is connected to the drying tube and is responsible for collecting the pyrolysis gas after drying treatment. This design makes the collection and subsequent analysis of the gas more convenient.

[0022] Furthermore, the gas collection component includes a gas collecting bottle, inside which an adjusting liquid is filled. A water tap is installed at the bottom of the gas collecting bottle, and a U-shaped tube manometer is installed at the top of the gas collecting bottle.

[0023] Beneficial effects: By adjusting the opening degree of the faucet, a slightly negative pressure state is created and maintained in the gas collecting cylinder, improving the collection efficiency of pyrolysis gas. The slightly negative pressure can prompt the pyrolysis gas to flow into the gas collecting cylinder more smoothly, reducing the escape and loss of gas during transmission, thus ensuring that the collected pyrolysis gas sample is purer and more complete. The U-shaped tube manometer, as a real-time monitoring tool, can accurately reflect the pressure state in the gas collecting cylinder. The experimenter can fine-tune the opening degree of the faucet according to the reading of the U-shaped tube manometer to achieve precise negative pressure control. This precise negative pressure control helps to optimize the collection conditions of pyrolysis gas, improving the accuracy and repeatability of the experiment. The design of the slightly negative pressure state also helps to protect the experimental environment and personnel safety. During the pyrolysis process, some substances with strong volatility may pose hazards to the human body or the environment. By collecting pyrolysis gas under slightly negative pressure, the diffusion and accumulation of these harmful substances in the laboratory can be effectively reduced, lowering the experimental risk.

[0024] Furthermore, the stainless steel reactor is connected to an inlet pipe. The end of the inlet pipe far from the stainless steel reactor is connected to an N2 replacement reactor. A mass flow meter is installed on the inlet pipe. Both the N2 replacement reactor and the mass flow meter are connected to the controller in a signal manner. The controller controls the opening and closing of the N2 replacement reactor according to the real-time monitoring data of the mass flow meter.

[0025] Beneficial effects: By introducing nitrogen into the stainless steel reactor through the N2 replacement reactor, the air and other potentially flammable, explosive, or harmful gases in the reactor can be effectively replaced, thus greatly improving the safety of the experimental process. The N2 replacement can eliminate the influence of the residual air in the reactor on the pyrolysis reaction, avoiding the participation of oxygen in the air in the reaction or interfering with the analysis of the products. This helps to ensure the accuracy and reliability of the experimental results, providing a solid foundation for subsequent data analysis. The mass flow meter can monitor the nitrogen flow rate entering the stainless steel reactor in real time, ensuring the sufficiency and uniformity of the nitrogen replacement. At the same time, the controller controls the opening and closing of the N2 replacement reactor according to the monitoring data of the mass flow meter, realizing the automation and precision of the nitrogen replacement process. This real-time monitoring and precise control help to improve the repeatability and stability of the experiment.

[0026] Furthermore, the geological exploration data in step two includes the thickness and distribution map of the oil-rich coal seam, the lithology and physical properties of the floor rock of the oil-rich coal seam, the geological structure of the oil-rich coal seam, the temperature gradient data of the oil-rich coal seam and the surrounding strata, and the physical properties of the oil-rich coal seam.

[0027] Beneficial effects: Geological exploration data provides a solid foundation for the construction of a three-dimensional geological model. By comprehensively considering the coal seam thickness and distribution, floor lithology and its physical properties, geological structure, temperature gradient, and physical properties of the coal seam, a three-dimensional geological model with high precision and high realism can be constructed. This model can accurately reflect the actual situation of the underground coal seam, providing a reliable basis for subsequent numerical simulation of pyrolysis reactions and the selection of monitoring points. Based on detailed geological exploration data, numerical simulation can more accurately simulate the pyrolysis reaction paths and product distributions under different conditions. Accurate prediction helps reduce experimental errors and improve resource utilization efficiency. Detailed geological exploration data helps reduce risks during coal exploration and development. By understanding the physical properties and geological structure of the coal seam and its surrounding strata, potential geological disasters and safety hazards can be predicted, and corresponding preventive measures can be taken in advance. At the same time, accurate geological data also helps optimize the mining plan, improving mining efficiency and safety.

[0028] Furthermore, the conditions simulated in step three include different heating temperature ranges, different heating rates, different pressure conditions, different reaction times, and different initial water contents of the coal seam.

[0029] Beneficial effects: By simulating pyrolysis reactions under various combinations of conditions, the physical and chemical change mechanisms of the coal seam during pyrolysis can be more comprehensively understood. This helps reveal the influence laws of different factors on pyrolysis reaction paths, product distributions, and reaction rates, providing a theoretical basis for optimizing pyrolysis processes. Numerical simulation can predict the pyrolysis effects under different process parameters, including the types, quantities, and pyrolysis efficiency of products. By comparing and analyzing the simulation results under different conditions, the optimal process parameters such as heating temperature range, heating rate, pressure condition, reaction time, and initial water content of the coal seam can be determined, thereby improving the efficiency of pyrolysis reactions and the quality of products. By comprehensively considering the influence of various factors, numerical simulation can more accurately predict the results of pyrolysis reactions. This prediction is not limited to the types and quantities of products, but also includes possible abnormal situations and risk points during the reaction process. This highly accurate and reliable prediction helps guide operations and controls in the actual production process.

[0030] Furthermore, the monitoring module in step four includes temperature sensors, pressure sensors, gas sample sensors, liquid level gauges, and seismic wave detectors.

[0031] Beneficial effects: Temperature sensor: It can real-time monitor the temperature changes of the oil-rich coal seam and its surrounding environment, providing accurate temperature data. It helps understand key information such as heat transfer efficiency, reaction rate, and product distribution during the pyrolysis reaction.

[0032] Pressure sensor: During the pyrolysis process, the pressure inside the coal seam changes with the generation and release of gas. The pressure sensor can accurately capture these changes and provide important data for analyzing the kinetics of the pyrolysis reaction.

[0033] Gas sample sensor: Specifically used to monitor the gas composition and concentration generated during the pyrolysis process. By collecting and analyzing gas samples in real time, the types and distributions of pyrolysis products can be understood, the pyrolysis effect can be evaluated, and potential safety hazards can be detected in a timely manner.

[0034] Liquid level gauge: During the pyrolysis of rich oil coal, if liquid products are generated, the liquid level gauge can ensure timely and accurate measurement of the amount of liquid products, which helps to optimize the collection and treatment processes.

[0035] Seismic wave detector: The seismic wave detector can be used to monitor the dynamic changes of underground rock formations, which helps to evaluate the impact of the pyrolysis process on the geological structure and detect and prevent possible geological disasters in a timely manner.

[0036] Furthermore, the data for comparative analysis in step five includes the composition of pyrolysis products, pyrolysis efficiency, and energy conversion rate.

[0037] Beneficial effects: By comparing and analyzing the composition of pyrolysis products under different conditions (such as temperature, pressure, reaction time, etc.), the generation rules and influencing factors of various products (such as gas, liquid, solid, etc.) can be deeply understood. This helps to optimize the pyrolysis process and improve the yield and purity of target products. By comparing and analyzing the pyrolysis efficiency under different pyrolysis conditions (such as the amount of gas or liquid products generated per unit mass of raw material), the influence of different process parameters on pyrolysis efficiency can be evaluated. This helps to determine the optimal process conditions and improve pyrolysis efficiency. By comparing and analyzing the energy conversion rate during different pyrolysis processes (such as the ratio of input energy to output energy), the energy utilization efficiency of the pyrolysis process can be evaluated. This helps to identify the main links of energy loss and take corresponding measures to reduce energy loss.

[0038] Furthermore, it also includes step six: According to the evaluation results of step five, if the degree of in-situ pyrolysis reaction evaluated does not reach the expected level, the pyrolysis process is adjusted and controlled in real time by adjusting the pyrolysis conditions.

[0039] Beneficial effects: Real-time regulation can ensure that the pyrolysis process is always carried out under optimal conditions, thereby maximizing the pyrolysis efficiency and product quality. By adjusting parameters such as heating temperature, heating rate, and pressure, the pyrolysis reaction path can be optimized, promoting the generation of target products while reducing the production of by-products. Real-time regulation can avoid resource waste caused by inappropriate pyrolysis conditions. If the degree of pyrolysis reaction is insufficient, it may lead to incomplete conversion of raw materials, resulting in resource waste; while excessive pyrolysis may produce unnecessary by-products, increasing the subsequent treatment cost. Through real-time regulation, it can be ensured that the pyrolysis process is carried out in the best state, thereby reducing resource waste and cost.

[0040] Further, the pyrolysis conditions in step six include heating rate, pressure, and reaction time.

[0041] Beneficial effects: Adjusting the heating rate can directly affect the rate and depth of the pyrolysis reaction. A slower heating rate helps the raw materials to be heated evenly and decompose slowly, which may produce more liquid products; while a faster heating rate may promote the generation of gas products. By precisely controlling the heating rate, fine regulation of the pyrolysis reaction process can be achieved to meet different product requirements. Pressure is an important factor affecting the pyrolysis reaction equilibrium and product distribution. Increasing the pressure can promote certain reaction paths and reduce the escape of gas products, thereby increasing the yield of liquid or solid products. Conversely, reducing the pressure is beneficial to the generation and release of gas products. By adjusting the pressure, the product distribution can be optimized and the yield of target products can be increased. The length of the reaction time determines the degree of progress of the pyrolysis reaction. A shorter reaction time may result in incomplete conversion of raw materials, while an overly long reaction time may trigger unnecessary side reactions. By adjusting the reaction time, it can be ensured that the pyrolysis reaction is carried out in the best state, making full use of raw materials and avoiding resource waste. Description of the Drawings

[0042] Figure 1 It is a flowchart of an embodiment of the method for monitoring and evaluating the degree of in-situ pyrolysis reaction of rich oil coal of the present invention.

[0043] Figure 2 It is a front view of the experimental device in an embodiment of the method for monitoring and evaluating the degree of in-situ pyrolysis reaction of rich oil coal of the present invention.

[0044] Figure 3 It is a cross-sectional view of the ring-type resistance furnace in an embodiment of the method for monitoring and evaluating the degree of in-situ pyrolysis reaction of rich oil coal of the present invention.

[0045] The reference numerals in the accompanying drawings of the specification include: ring-type resistance furnace 1, stainless steel reactor 2, thermocouple 3, conical flask 4, condensation water bath 5, drying tube 6, gas collecting bottle 7, faucet 701, U-tube manometer 8, N2 displacement reactor 9, mass flowmeter 10. Detailed Embodiments

[0046] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0047] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "longitudinal", "transverse", "vertical", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0048] In the description of the present invention, unless otherwise specified and defined, it should be noted that the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a mechanical connection or an electrical connection, or it may be the communication inside two elements. It may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0049] The following will be further described in detail by specific embodiments:

[0050] Example 1 is basically as shown in the attached Figure 1 drawing: A method for monitoring and evaluating the degree of in-situ pyrolysis reaction of rich oil coal, and the specific steps are as follows:

[0051] Step 1: Sample the rich oil coal seam that needs in-situ pyrolysis, and conduct a pyrolysis experiment on the collected sample using an experimental device, and use the experimental data of the sample as the standard data for evaluation.

[0052] Step 2: Use three-dimensional geological modeling technology and combine geological exploration data to establish a three-dimensional geological model of the rich oil coal seam; the geological exploration data includes the thickness and distribution map of the rich oil coal seam, the lithology and physical properties of the floor rock of the rich oil coal seam, the geological structure of the rich oil coal seam, the temperature gradient data of the rich oil coal seam and the surrounding strata, and the physical properties of the rich oil coal seam.

[0053] Step 3: Combine the experimental data in Step 1 to perform numerical simulation of the pyrolysis reaction process on the three-dimensional geological model in Step 2, and simulate the pyrolysis reaction paths and product distributions under different conditions; the simulated conditions include different heating temperature ranges, different heating rates, different pressure conditions, different reaction times, and different initial water contents of the coal seam.

[0054] Step 4: According to the simulation results in step 3, select appropriate monitoring points in the oil-rich coal seam area and install monitoring modules. The monitoring modules are used to collect parameters of the oil-rich coal seam during the pyrolysis process in real time; the monitoring modules include temperature sensors, pressure sensors, gas sample sensors, liquid level meters and seismic wave detectors.

[0055] Step 5: Compare and analyze the monitored data in step 4 with the standard data in step 1 to evaluate the degree of pyrolysis reaction of the oil-rich coal seam. The comparative analysis data includes the composition of pyrolysis products, pyrolysis efficiency and energy conversion rate.

[0056] Step 6: Based on the evaluation results of step 5, if the evaluated in-situ pyrolysis reaction degree does not reach the expected degree, the pyrolysis process is regulated in real time by adjusting the pyrolysis conditions, which include heating rate, pressure and reaction time.

[0057] The specific implementation process is as follows:

[0058] Step 1, sample collection and experiment: According to the geological exploration report of the oil-rich coal seam, carefully study the geological exploration report, mark the changes in coal seam thickness, lithological boundaries and areas with complex geological structures. Determine the sampling points to ensure that these points can represent the diversity of the entire oil-rich coal seam. Use coal sampling tools (such as core drills, coal sample shovels, etc.) to collect samples in strict accordance with the sampling specifications, and record the precise location of the sampling points, coal seam depth, lithological characteristics and other information. Send the collected samples to the laboratory, where special equipment is used to crush and screen them, remove impurities, and retain coal samples with a representative particle size range.

[0059] The experimental device was used to carry out pyrolysis experiments on the pretreated samples under different conditions (including different heating temperatures, heating rates and pressures, etc.), and key parameters (such as weight loss curves, gas product release rates and product compositions, etc.) were recorded as standard data.

[0060] Step 2, 3D geological modeling: Integrate geological exploration data, including borehole core records, seismic profile interpretation and well logging curves. Use GIS software to interpolate spatial data and generate continuous geological parameter distribution maps (such as coal seam thickness, lithology distribution, etc.). Specially process temperature gradient data to consider the impact of geothermal flow, groundwater flow and other factors on temperature distribution. In the geological modeling software, construct a 3D geological model based on the processed data. Finely depict the morphology, thickness changes, lithology interface and temperature gradient of the coal seam. Verify the accuracy of the model and compare it with known geological information to ensure the reliability of the model.

[0061] Step 3, Numerical Simulation: Based on the three-dimensional geological model, set up the mathematical model and physical parameters of the pyrolysis reaction, such as the thermal conductivity coefficient, reaction kinetic parameters, etc. According to the experimental data and actual production requirements, set various simulation conditions, such as different heating temperature ranges (e.g., 300°C - 700°C), heating rates (e.g., 5°C / min - 20°C / min), pressures (e.g., atmospheric pressure to high pressure), reaction times (e.g., several hours to several days), and the initial water content of the coal seam. Run the numerical simulation software to calculate the pyrolysis reaction path and product distribution under different conditions and generate the simulation results.

[0062] Step 4, Monitoring Point Selection and Installation of Monitoring Modules: According to the simulation results and geological model, select monitoring points that can reflect the key change areas during the pyrolysis process to ensure that the pyrolysis situation of the oil-rich coal seam can be comprehensively reflected. Install monitoring modules such as temperature sensors, pressure sensors, gas sample sensors, liquid level gauges, and seismic wave detectors at the selected monitoring points to ensure that key parameters during the pyrolysis process can be collected in real time.

[0063] Step 5, Data Comparison and Analysis: Regularly collect the data transmitted by the monitoring modules and organize and analyze them. Compare the monitoring data with the standard data in Step 1 to analyze the changes in key indicators such as the composition of pyrolysis products, pyrolysis efficiency, and energy conversion rate, so as to analyze and evaluate the reaction degree of in-situ pyrolysis of the oil-rich coal seam.

[0064] Step 6, Real-time Regulation: According to the results of the comparison and analysis, evaluate whether the current pyrolysis reaction degree reaches the expected goal. If it does not reach the expectation, formulate specific regulation measures according to the evaluation results, such as adjusting the heating rate, pressure, or reaction time. Implement the regulation measures through the remote control system or on-site operation, and continuously monitor the regulation effect until the expected pyrolysis reaction degree is achieved.

[0065] Through the above specific implementation process, it is possible to accurately monitor and evaluate the reaction degree of in-situ pyrolysis of oil-rich coal, and perform real-time regulation according to the actual situation to optimize the pyrolysis process and improve the resource utilization efficiency.

[0066] Example 2, The difference from the above example is that, as shown in Figure 2 and Figure 3 : The experimental device includes a pyrolysis component, a condensation component, a gas collection component, and a controller. The pyrolysis component includes a ring-shaped resistance furnace 1, inside which a stainless-steel reactor 2 is installed. A thermocouple 3 is installed between the ring-shaped resistance furnace 1 and the stainless-steel reactor 2. The stainless-steel reactor 2 is connected to an inlet pipe, and the end of the inlet pipe far from the stainless-steel reactor 2 is connected to an N2 replacement reactor 9. A mass flow meter 10 is installed on the inlet pipe. Both the N2 replacement reactor 9 and the mass flow meter 10 are connected to the controller in a signal manner, and the controller controls the opening and closing of the N2 replacement reactor 9 according to the real-time monitoring data of the mass flow meter 10.

[0067] The condensation assembly includes a conical flask 4 and a condensation water bath 5. The conical flask 4 is detachably connected to the condensation water bath 5 through a mounting bracket. The conical flask 4 is communicated with the stainless steel reactor 2. The conical flask 4 is communicated with a drying tube 6. One end of the drying tube 6 away from the conical flask 4 is communicated with the gas collection assembly. The thermocouple 3 is signal-connected to the controller, and the controller controls the opening and closing of the thermocouple 3.

[0068] The gas collection assembly includes a gas collecting bottle 7. The inside of the gas collecting bottle 7 is filled with a regulating liquid. A faucet 701 is installed at the bottom of the gas collecting bottle 7. The gas collecting bottle 7 is installed with a U-tube manometer 8 through a mounting bracket.

[0069] The specific implementation process is as follows: Before conducting experiments on the collected samples in the laboratory, correctly install the stainless steel reactor 2 in the ring-type resistance furnace 1, connect the thermocouple 3, and ensure that the connections of the inlet pipe, mass flowmeter 10, and N2 replacement reactor 9 are tightly connected without leakage. Connect the conical flask 4 to the condensation water bath 5 to ensure good condensation effect, and connect the drying tube 6 to the gas collection assembly. Fill an appropriate amount of regulating liquid (such as saturated brine) into the gas collecting bottle 7 to ensure that the faucet 701 and the U-tube manometer 8 work properly.

[0070] Place the different collected samples in the stainless steel reactors 2 of different experimental devices respectively. Start the N2 replacement reactor 9 through the controller, and introduce N2 into the stainless steel reactor 2 to remove the air in the reactor. Observe the reading of the mass flowmeter 10 to ensure that the nitrogen flow rate is stable and reaches the preset value, and continue to introduce nitrogen until the air in the reactor is completely replaced.

[0071] Then start the thermocouple 3 through the controller to pyrolyze the samples in the stainless steel reactor 2. Heat up to the target temperatures of 300°C, 400°C, 500°C, 600°C, and 700°C at a heating rate of 5°C / min and hold for 30 min to ensure sufficient pyrolysis. The volatile products generated during the pyrolysis process will flow into the gas collecting bottle 7 through the conical flask 4 and the drying tube 6. Due to the function of the condensation water bath 5, the oil-water mixture will be condensed and remain in the conical flask 4, and a small amount of oil and water entrained in the gas will be intercepted by the drying tube 6. At the same time, by adjusting the opening degree of the faucet 701, the gas collecting bottle 7 can always be kept in a slightly negative pressure state (monitored in real time by the U-tube manometer 8), so that the pyrolysis gas can be better pumped into the gas collecting bottle 7.

[0072] After the experiment, weigh the mass of semicoke and the oil-water mixture respectively, calculate the gas mass by the subtraction method, separate the oil-water mixture by a centrifuge, then measure the mass of oil and water, and calculate the product yield according to the mass of pyrolysis products. Among them, the pyrolysis gas yield is calculated by the subtraction method. Record all the data during the experiment in detail, including temperature, time, mass, etc. Conduct statistical analysis on the experimental data and compare the product distribution and yield changes at different temperatures.

[0073] The above are only embodiments of the present invention, and common knowledge such as specific structures and / or characteristics known in the solution is not described in detail here. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.

Claims

1. A method for monitoring and evaluating the degree of in-situ pyrolysis reaction of oil-rich coal, characterized in that: The specific steps are as follows: Step 1: Sampling the oil-rich coal seam that needs to be in-situ pyrolyzed, using the experimental device to conduct pyrolysis experiments on the collected samples, and using the experimental data of the samples as standard data for evaluation; Step 2: Use 3D geological modeling technology and geological exploration data to build a 3D geological model of the oil-rich coal seam; Step 3: Combine the experimental data in step 1 to perform numerical simulation of the pyrolysis reaction process on the three-dimensional geological model in step 2, and simulate the pyrolysis reaction path and product distribution under different conditions; Step 4: According to the simulation results in step 3, select appropriate monitoring points in the oil-rich coal seam area and install monitoring modules, which are used to collect parameters of the oil-rich coal seam during the pyrolysis process in real time; Step 5: Compare and analyze the monitored data in step 4 with the standard data in step 1 to evaluate the degree of pyrolysis reaction of the oil-rich coal seam.

2. The method for monitoring and evaluating the degree of in-situ pyrolysis reaction of oil-rich coal according to claim 1, characterized in that: The experimental device in step one includes a pyrolysis component, a condensation component, a gas collection component and a controller. The pyrolysis component includes a ring-type resistance furnace, a stainless steel reactor is installed inside the ring-type resistance furnace, and a thermocouple is installed between the ring-type resistance furnace and the stainless steel reactor. The condensation component includes a conical flask and a condensation water bath. The conical flask and the condensation water bath are detachably connected, the conical flask is connected to the stainless steel reactor, the conical flask is connected to a drying tube, and the drying tube is connected to the gas collection component at one end away from the conical flask. The thermocouple is connected to the controller signal, and the controller controls the opening and closing of the thermocouple.

3. The method for monitoring and evaluating the degree of in-situ pyrolysis reaction of oil-rich coal according to claim 2, characterized in that: The gas collecting assembly comprises a gas collecting bottle, the inside of which is filled with regulating liquid, a faucet is installed at the bottom of the gas collecting bottle, and a U-tube differential pressure gauge is installed at the top of the gas collecting bottle.

4. The method for monitoring and evaluating the degree of in-situ pyrolysis reaction of oil-rich coal according to claim 2, characterized in that: The stainless steel reactor is connected to an air inlet pipe, and one end of the air inlet pipe away from the stainless steel reactor is connected to a N2 replacement reactor. A mass flow meter is installed on the air inlet pipe. Both the N2 replacement reactor and the mass flow meter are connected to the controller signal. The controller controls the opening and closing of the N2 replacement reactor according to the real-time monitoring data of the mass flow meter.

5. The method for monitoring and evaluating the degree of in-situ pyrolysis reaction of oil-rich coal according to claim 1, characterized in that: The geological exploration data in step 2 include the thickness and distribution map of the oil-rich coal seam, the lithology and physical properties of the oil-rich coal seam bottom plate, the geological structure of the oil-rich coal seam, the temperature gradient data of the oil-rich coal seam and the surrounding strata, and the physical properties of the oil-rich coal seam.

6. The method for monitoring and evaluating the degree of in-situ pyrolysis reaction of oil-rich coal according to claim 1, characterized in that: The conditions simulated in step three include different heating temperature ranges, different heating rates, different pressure conditions, different reaction times and different initial moisture contents of the coal seams.

7. The method for monitoring and evaluating the degree of in-situ pyrolysis reaction of oil-rich coal according to claim 1, characterized in that: The monitoring module in step 4 includes a temperature sensor, a pressure sensor, a gas sample sensor, a liquid level meter and a seismic wave detector.

8. The method for monitoring and evaluating the degree of in-situ pyrolysis reaction of oil-rich coal according to claim 1, characterized in that: The data for comparative analysis in step five include the composition of pyrolysis products, pyrolysis efficiency and energy conversion rate.

9. The method for monitoring and evaluating the degree of in-situ pyrolysis reaction of oil-rich coal according to claim 1, characterized in that: The method further includes step six: based on the evaluation result of step five, if the evaluated degree of in-situ pyrolysis reaction does not reach the expected degree, the pyrolysis process is controlled in real time by adjusting the pyrolysis conditions.

10. The method for monitoring and evaluating the degree of in-situ pyrolysis reaction of oil-rich coal according to claim 9, characterized in that: The pyrolysis conditions in step six include heating rate, pressure and reaction time.

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