81 results about "Coal measures" patented technology

The invention discloses a weakly cemented mining stratum roadway roof separation limit value determination method, relates to the technical field of mine roadway damage surrounding rock anchor net cable support and roof stability monitoring, and focuses on roadway surrounding rock roof support and monitoring of a weakly cemented coal mining stratum. The most typical damage form is sudden roadway roof fall and roadway integral convergence, and the life safety of mine engineering technicians is greatly threatened. The roof separation value is the relative displacement between two measuring points in the surrounding rock and between the surrounding rock at the end of the anchor rod and the surface of the roadway roof, belongs to the mine pressure display of the mine roadway, and is an important index for evaluating the anchor net cable supporting effect. The anchor net and anchor cable roof separation value based on the excavation disturbance rock damage degree is accurately calculated and monitored, and the method has important significance for guaranteeing mine safety production.

The invention discloses a coal-series gas yield increasing and CO2 geological sequestration integrated simulation method and system, and relates to the technical field of gas exploitation of each layer, and the method comprises the following specific steps: building a geological model representing a multi-lithology superposed coal-series reservoir; the coal series reservoir is a heterogeneous reservoir and comprises shale, a coal seam and sandstone, the shale and the coal seam are double-hole double-permeability media, and the sandstone is a single-hole single-permeability medium; based on the geologic model, establishing a multi-physical field coupling model of a coupling temperature field, a seepage field and a stress field; performing discretization solution on the multi-physics field coupling model to obtain a numerical simulation result; constructing a numerical model, and performing inversion correction on model parameters of the numerical model based on experimental data and the numerical simulation result; and utilizing the corrected numerical model to simulate different injection-production working conditions so as to carry out double-target evaluation and scheme optimization of coal-series gas yield increase and CO2 geological sequestration. The method provides a reliable decision basis for engineering scheme design.

The invention relates to the technical field of coal gangue resource utilization, in particular to a magnetic coal series kaolin hydrogel adsorbing material as well as a preparation method and application thereof. The preparation method of the material specifically comprises the following steps: carrying out ultrafine grinding, sieving and grading on coal gangue ore to obtain a coal series kaolinite material; further performing magnetic separation to obtain coal series kaolinite iron-rich tailings; further performing magnetizing roasting in a reducing atmosphere to obtain magnetic coal series kaolin; the preparation method comprises the following steps: compounding magnetic coal series kaolin with sodium alginate and chitosan by adopting a gel coating method, dropwise adding a calcium chloride solution for crosslinking, and freeze-drying to obtain the magnetic coal series kaolin hydrogel material. The preparation method is simple, and the obtained adsorption material has the characteristics of low cost, large adsorption capacity, high adsorption rate, high selectivity, excellent cyclic utilization performance and the like.

This application discloses a design method and grouting material for deep coal-bearing strata, comprising the following steps: S1 Data acquisition based on material pre-tests, correlation analysis, and orthogonal experiments; S2 Data expansion based on orthogonal experimental data to establish a dataset; S3 Creating a prediction model based on the RBF algorithm; S4 Optimizing the prediction model based on the PSO-RBF algorithm; S5 Proportion design based on the RBF-PSO-EWM algorithm; S6 Obtaining the proportion of grouting material for deep coal-bearing strata. This application proposes a PSO-RBF-EWM multi-objective optimization grouting material proportion design method and applies this method to design the comprehensive optimal proportion of grouting material for deep coal-bearing strata. The grouting material with the obtained optimal proportion has excellent characteristics such as low water-cement ratio, green environmental protection, and economic efficiency, and is suitable for the reinforcement characteristics of deep coal-bearing strata.

The invention relates to the technical field of ore recognition, in particular to a method and a system for quickly and preliminarily recognizing field ore quality of coal-series trilean metal mineral products, which comprises the following steps of: acquiring ore samples and acquiring main peaks, structures and infrared images, extracting image features to generate mutation numbers, analyzing sampling coordinates to reconstruct a connection structure, and calculating the quality of the coal-series trilean metal mineral products. Drawing a closed boundary to judge coordinate attribution, and outputting an ore quality identification scheme. According to the method, main peak reflection, microscopic image layers and infrared spectrum acquisition results are numbered in a unified manner and are subjected to time sequence binding, a synchronous corresponding relation among multi-source images is established, continuous change nodes and sudden change areas are identified in combination with offset tracks and structural features, spatial concentration blocks are generated by using number and coordinate mapping, and a connected structure is reconstructed; and drawing a closed boundary according to the track to form a region classification basis, verifying a mass change direction through image sequence coherence, and outputting a tagging identification result, thereby realizing rapid positioning and accurate classification of the field ore sample.

The invention discloses a non-coal measure stratum natural gas displacement mathematical model construction method. The method comprises the following steps that gas migration equations are established, wherein the gas migration equations comprise the step of establishing a rock mass pore gas diffusion motion control equation and the step of establishing a stratum fracture gas seepage equation; establishing a stratum rock mass deformation control equation; establishing a dynamic porosity and permeability change control equation: establishing a rock mass porosity dynamic change equation, establishing a stratum fracture rate dynamic change equation and establishing a permeability dynamic change equation; and establishing a non-coal measure stratum natural gas displacement mathematical model based on the above steps. The non-coal measure stratum natural gas displacement mathematical model is established by combining the non-coal measure stratum natural gas displacement characteristics, and a scheme which is good in treatment effect, low in cost and high in efficiency is provided for non-coal measure stratum natural gas emission.

The invention discloses a method and device for identifying a coal reservoir, and the method comprises the steps: obtaining a coal rock sample of a target interval, and carrying out a thermogravimetric experiment on the coal rock sample; performing image analysis on data obtained by the thermogravimetric experiment to determine a first coal series reservoir; performing thermogravimetric mass spectrometry data analysis on the coal rock sample corresponding to the first coal series reservoir; and determining a final coal reservoir according to a thermogravimetric mass spectrometry data analysis result.

The invention relates to the technical field of unconventional resource development, in particular to a method and a device for determining lithology space-time distribution characteristics of coal measure gas, and the corresponding method comprises the following steps: building a sequence stratigraphic framework of a target work area according to rock debris logging data and logging data of the target work area; determining dominant storage lithology corresponding to each coal series gas; according to the sequence stratigraphic framework and the advantage storage lithology corresponding to each type of coal measure gas, establishing a well connection section and a lithology plane graph; and according to the well connection profile and the lithologic plan, determining the lithologic spatial-temporal distribution characteristics of the coal-series gas. The effective determination method of the lithology space-time distribution rule is formed on the basis of combination of the sequence strata, the rock core and the logging, rock core constraint, logging lithology correction and high-precision sequence strata isochronous framework constraint, and then the lithology space-time distribution rule of coal bed gas, coal series shale gas and coal series tight sandstone gas evaluation is determined.

The application provides a roof coal series aquifer post-mining partition grouting aquifuge reconstruction method and related equipment, aiming at the problem of coal seam roof water disaster control after mining, by comprehensively considering the geological parameters and stratum distribution parameters of the target mining area, the accurate analysis of the hydrogeological characteristics of the coal seam roof rock stratum is realized. Then, the development height of the water flowing fractured zone is accurately determined by using the distribution characteristic algorithm and the numerical simulation algorithm, and then the correlation between the water flowing fractured zone and the hydrogeological characteristics is analyzed in depth by using the distribution relationship algorithm, so that the difference of different geological conditions can be fully considered, therefore, the grouting treatment according to the target grouting treatment strategy of the post-mining coal seam roof determined based on the distribution relationship can significantly improve the pertinence of water disaster control, avoid the problem of poor grouting treatment effect caused by complex geological conditions, and effectively reduce the risk of coal seam roof water disaster.

The present invention discloses a method for underground sand and coal dust prevention in a combined-layer coalbed methane well. Two upper and lower drainage devices are provided in the combined-layer coalbed methane well. First, a combined-layer development coalbed methane well with a two-wellbore structure is constructed on the ground, and the lower structural coal and the upper native structural coal are subjected to fracturing transformation in sequence. A packer is used to suspend a lower drainage pipe string at the top plate of the structural coal producing layer, so that the return fluid, formation water, and coalbed methane produced by the structural coal producing layer can enter the interior of the lower drainage pipe string through the wire-wound screen pipe. At the same time, the proppant and coal dust produced in large quantities by the structural coal producing layer are blocked from entering the drainage pipe string, and the proppant and coal dust are caused to sink to the bottom of the artificial well under the action of gravity. The lower drainage pipe string is used to prevent sand and coal dust, reduce the risk of pump sticking, and ensure the continuity of the drainage process of the combined-layer development coalbed methane well. It is particularly suitable for coalbed methane drainage under conditions where the coal body structure of the main coalbed methane producing layer in the middle and lower coal measures is broken and a large amount of sand and dust is expelled during combined-layer drainage.

The embodiment of the invention provides a simulation experiment device and method for coal-series gas enrichment, and relates to the technical field of natural gas exploration and development. The simulation experiment device for coal series gas enrichment comprises a first reaction cabin, a second reaction cabin and a third reaction cabin which are sequentially communicated and stacked, the first reaction cabin is used for containing a bottom rock sample, the second reaction cabin is used for containing a coal seam sample, and the third reaction cabin is used for containing a top rock sample; the injection system is communicated with the first reaction cabin; the first reaction cabin, the second reaction cabin and the third reaction cabin are respectively provided with at least one stress loader and at least one heater. Through collaborative design of multi-cabin layered sample bearing and independent stress and temperature regulation, confining pressure constraint and interlayer stress transfer of a top plate rock sample and a bottom layer rock sample to a coal seam sample are accurately simulated, the real occurrence environment of coal series gas in a stratum is reduced, the influence of interlayer stress on coal series gas enrichment is prevented from being ignored, and obtained experimental data are more reliable.

This invention belongs to the field of quartz sandstone purification technology, specifically relating to a simple purification method for coal-based graphite, comprising the following steps: crushing low-grade coal-based graphite as raw material to obtain crushed coal-based graphite; mixing the crushed coal-based graphite with solid alkali and flux, followed by calcination and alkali fusion treatment to obtain calcined and alkali-fused coal-based graphite; acid leaching the calcined and alkali-fused coal-based graphite, followed by water washing, filtration, and drying to obtain high-grade coal-based graphite. Compared with existing graphite purification technologies, this invention does not require costly and hazardous reaction reagents or harsh conditions of high temperature and high pressure, and has advantages such as high graphite product purity, simple processing, convenient operation, mild conditions, environmental friendliness, and low cost. Using low-grade coal-based graphite with a fixed carbon content of 65%–85% as raw material, the process of this invention can obtain high-purity graphite with a fixed carbon content greater than 99.5%.

The application discloses a kind of complex coal measures strata double horizontal well cyclic injection CO2 vertical displacement coalbed gas mining method, belong to coalbed gas development technical field.Deep coal measures strata is selected as purpose layer, and two single branch horizontal wells are drilled in the same well group.One horizontal section is located at the top of purpose layer for coalbed gas extraction and fracturing;Another horizontal section is located at the bottom of purpose layer for injecting liquid CO2.Before extraction, by continuously injecting liquid CO2 into the bottom of purpose layer, the displacement and displacement effect of CO2 on CH4 are used to improve the recovery of deep coalbed gas;During extraction, part of CO2 is extracted with CH4, and the extracted CO2 is liquefied and recycled into the bottom of purpose layer through CO2 separation device;At the end of extraction, most of CH4 has been extracted, and the horizontal well is sealed to prevent CO2 from leaking, achieving the purpose of CO2 storage.The method is simple and easy to implement, and can be used for complex structure of purpose layer.

The invention provides a coal measure strata tight sandstone gas earthquake identification method and device, and relates to the technical field of earthquake gas reservoir prediction, and the method comprises the steps: carrying out the coal seam multiple suppression processing of the seismic data of a target work area, and obtaining the preprocessed seismic data; generalized S transformation is carried out on the preprocessed seismic data to obtain time-frequency spectrum data; extracting a plurality of gas layer sensitive time-frequency attributes from the time-frequency spectrum data; and performing multi-attribute well control fusion processing on the plurality of gas reservoir sensitive time-frequency attributes to obtain a gas reservoir sensitive factor, and based on the gas reservoir sensitive factor, generating an earthquake identification map for identifying the tight sandstone gas of the coal measure strata. According to the method, the data signal-to-noise ratio is increased by pressing coal bed interlayer multiples, multi-angle gas bed sensitive time-frequency attributes are extracted through high-resolution time-frequency analysis, a visual recognition map is generated through well control fusion, the problem that tight sandstone gas weakness response is difficult to recognize due to coal bed strong shielding is systematically solved, and the method has the advantages of being high in practicability and the like. And the identification precision and reliability are improved.

The present application relates to the technical field of geological modeling, in particular to a deep stratum petrophysical modeling method under complex lithology background, comprising the following steps: well logging data preprocessing, mineral model optimization processing, petrophysical modeling and shear wave prediction, and verification of the accuracy of the petrophysical model in predicting shear wave. The present application adopts four mineral models of quartz-clay model, calcite-clay model, coal and bauxite, respectively, and performs optimal multi-mineral model processing in stratigraphic sections, so as to obtain the petrophysical modeling of deep coal measure stratum complex lithology combination and pore structure under shear wave prediction, and improve the accuracy of shear wave prediction.

The invention discloses a monitoring method and system based on a coal-series plastic seepage-resistant layer, and the method comprises the steps: delimiting a monitoring region of the coal-series plastic seepage-resistant layer, collecting micro-seismic data and geological exploration data in the monitoring region, drawing a geological structure map, marking a bearing layer, a critical layer and an external layer in the geological structure map, wherein the bearing layer is located at the overlying and underlying positions of a coal mining operation area, the external connection layer is located at the boundary of a monitoring area, the joint part of the bearing layer and the external connection layer is a critical layer, a deployment route of the distributed optical fibers in the bearing layer is set, and a plurality of key nodes are selected from the deployment route and defined as the installation positions of the branching devices. According to the method, the abnormal section is searched, so that the local deformation or offset area of the coal-series plastic seepage-resistant layer and the adjacent layer position can be accurately positioned, the dynamic risk assessment and real-time early warning of the monitoring area are effectively realized, and the long-term stability and safe operation of the coal mining process are ensured.

The present application relates to the field of coal fluidized mining, especially to a coal microbial gasification method for simulating in-situ coal seam environment in laboratory, which comprises the following steps in sequence: (1) preparing coal rock sample; (2) forming injection channel; (3) microbial culture; (4) stress and temperature loading; (5) nutrient solution injection; (6) effect test; the present application proposes a coal microbial gasification method for simulating in-situ coal seam environment in laboratory, which simulates the rock stratum and ground stress environment where the coal seam is located, studies the influence of rock stratum mineral matter on microbial growth and ground stress on gas-liquid transmission, and the laboratory test is closer to in-situ environment, improves the accuracy of laboratory data, and promotes the transfer of the technology to the field.

The invention relates to the technical field of tunnel construction, in particular to a mountain coal measure stratum high-temperature steam injection fracturing method and system. According to the fracturing method, continuous and real-time monitoring of temperature field spatio-temporal evolution in the fracturing process is achieved through a distributed optical fiber temperature sensing technology; a micro-seismic signal generated by fracturing is captured through a distributed optical fiber sound wave sensing technology, underground apparent shear wave velocity profile imaging is obtained, multi-parameter collaborative analysis and fusion are carried out on temperature field evolution, micro-seismic event spatial distribution and apparent shear wave velocity profile changes before and after fracturing, and comprehensive and accurate delineation of a hot steam injection fracturing influence range is achieved; the fracturing system is based on the high-temperature steam injection fracturing method for the mountain coal measure strata, the structure is simple, arrangement is easy, the fracturing effect under the thermal-mechanical coupling effect in the hot steam injection fracturing process can be accurately represented in real time, and an effective means is provided for optimizing gas extraction of the mountain coal measure strata and guaranteeing tunnel construction safety.

The invention discloses a coal measure tight sandstone thin reservoir prediction method based on seismic frequency division configuration inversion, and relates to the technical field of oil-gas exploration and development, and the method comprises the steps: 1, collecting logging curve data, and carrying out the standardization processing; 2, performing wavelet transform on the standardized data to extract a signal, and reconstructing the extracted signal through wavelet inverse transform to obtain a pseudo-wave impedance curve; 3, constructing a frequency division configuration model according to the simulated wave impedance curve and the collected seismic data; 4, according to the frequency division configuration model, random inversion is carried out through a Markov chain Monte Carlo random algorithm, and reservoir parameters are obtained. According to the method, phase control-logging-seismic data are combined, and frequency division configuration inversion is fused into the lithology and fluid sensitive reconstruction curve to realize accurate prediction of the coal measure tight sandstone thin reservoir.

The invention discloses an inversion method and device for a longitudinal-transverse wave velocity ratio of a coal measure strata, and the method comprises the steps: determining the longitudinal-transverse wave velocity ratio reflectivity of a target interval according to the prestack angle gather data of the target interval, and extracting the attribute data of the longitudinal-transverse wave velocity ratio reflectivity through employing the AVO technology; according to the longitudinal and transverse wave velocity ratio curve, the attribute data of the longitudinal and transverse wave velocity ratio reflectivity and preset wavelet extraction time window parameters, wavelet extraction is carried out on the target layer section through the wavelet extraction technology; the longitudinal and transverse wave velocity ratio curve is determined according to logging data; and according to the wavelet and the attribute data of the velocity ratio reflectivity of the longitudinal and transverse waves, performing post-stack compressed sensing reflection coefficient inversion to obtain an inversion result of the velocity ratio reflectivity of the longitudinal and transverse waves. According to the invention, a stable inversion result of the longitudinal and transverse wave velocity ratio can be effectively obtained.

The present application relates to a kind of fly ash geopolymer-based photovoltaic pile and its preparation method and application, belong to salt alkali photovoltaic pile and solid waste resource utilization technical field.The preparation method includes the following steps: S1: using coal series kaolin to prepare metakaolin;S2: after mixing with red mud and caustic soda, high-temperature calcination is carried out, then the obtained calcination product is ground and sieved, to obtain alkali fusion material;S3: the metakaolin, the alkali fusion material and fly ash are mixed, then water is injected into mould and is shaped treatment, and photovoltaic pile is obtained after demoulding and curing.The production process of photovoltaic pile in the present application is low carbon and environmentally friendly, realizes the resource utilization of red mud and fly ash;In addition, photovoltaic pile has dense three-dimensional network structure, strong alkali resistance, salt and erosion resistance, and by adjusting liquid-solid ratio and raw material ratio, the setting time can be obviously shortened, which is beneficial to the application of photovoltaic pile in offshore and saline-alkali soil photovoltaic power generation, wind power foundation structure.

The application discloses a coal measure stratum tunnel harmful gas surveying and evaluating method, which comprises the following steps: based on the regional coal rock geological background and the regional geological condition, the tunnel body is segmented according to the engineering geology; test holes are arranged to measure the coal measure stratum magnetization rate and the ton coal gas content, and the relationship between the ton coal gas content and the magnetization rate is fitted as Q0=2.35*10 ‑2 ×e (C / 32.34) -0.05; 3) surveying holes are arranged according to the engineering geology segmentation, the tunnel body coal measure stratum section is inferred according to the occurrence, the rock stratum magnetization rate in the surveying hole is measured through the comprehensive well logging test in the hole; based on the measured magnetization rate in the hole, the ton coal gas content of each test hole of the tunnel is calculated, the ton coal gas content change curve of the coal measure tunnel is drawn, and the gas comprehensive evaluation of the tunnel segmentation is carried out. Through the division of the tunnel body according to the engineering geology segmentation, the relationship between the ton coal gas content and the magnetization rate is fitted, the gas concentration detection and the content calculation are reduced while ensuring the continuous exploration, the surveying period is shortened, and the surveying cost is saved.

The invention relates to the technical field of geological modeling, in particular to a deep stratum rock physical modeling method under a complex lithologic background, which comprises the following steps of logging data preprocessing, mineral model optimization processing, rock physical modeling and transverse wave prediction, and rock physical model prediction transverse wave accuracy verification. According to the method, the four mineral models, namely the quartz-clay model, the calcite-clay model, the coal model and the bauxite model are adopted respectively, and optimized multi-mineral model processing is carried out in a layered manner, so that rock physical modeling for realizing complex lithologic combination of the deep coal measure strata and transverse wave prediction under a pore structure is obtained, and the accuracy of transverse wave prediction is improved.

The application provides a coal measure gas multilayer combined mining device, method and system. The device comprises a plurality of mining assemblies arranged at respective target reservoirs in a well. The mining assemblies are arranged in the perforated sections of the target reservoirs. The mining assemblies divide the oil casing annular area in the well into independent mining areas corresponding to the perforated sections and flow channels that keep the oil casing annular area continuously communicated. The independent mining areas have a mining outlet that is communicated with the oil casing annular area and unidirectionally conducted. Based on the technical scheme of the application, the interference between different reservoirs of a coal measure straight well can be avoided, the significance of combined mining due to interlayer interference can be avoided, precise control can be provided for gas well extraction, accurate production data can be provided in real time, and reliable technical means can be provided for fine management of coal measure gas straight well extraction.

The invention provides a method for simulating the enrichment process of rare metal gallium in well field coal, and relates to the technical field of simulation methods, and the method comprises the following steps: constructing a geologic model and initializing parameters of a coal sample; performing pyrolysis process dynamics simulation; simulating a gas-solid phase gallium migration path; carrying out selective enrichment modeling on gallium in ash; optimizing a solvent extraction and separation process; and carrying out whole-process coupling and economical efficiency verification. According to the method, through geological exploration and molecular dynamics multidisciplinary models, full-process digital mapping from the coal seam occurrence form to the high-purity gallium product is achieved, the prediction error is low, meanwhile, based on the Monte Carlo risk model, the influence of variables such as grade fluctuation and energy consumption cost is quantified, an operation window is dynamically optimized, the cost of per ton of gallium is reduced, and the prediction efficiency is improved. Through waste heat power generation and reagent circulation, the emission of gallium per ton is reduced, the engineering problem of coal series gallium extraction is systematically solved, it is ensured that solvent extraction separation factors can meet the high-purity requirement, and the productivity loss can be reduced.

The invention belongs to the field of mine geophysical prospecting, and discloses a mining-while-electrical-method advanced detection pure anomaly enhancement method which specifically comprises the following steps: step 1, mining-while-electrical-method data acquisition; 2, superposing and averaging observation data at the same position; step 3, extracting pure abnormal response in front of the tunneling head-on; 4, enhancing the pure abnormal response strength in front of the tunneling head-on; and 5, restoring the apparent resistivity and the voltage value. According to the method, the stability of advanced detection data of the mining-following electrical method in a noise environment is improved; background influences such as random noise, coal measure strata, roadway cavities, roadway side anomalies and excavation head-on mining damage are eliminated, and extraction of pure anomaly response in front of an excavation head-on is achieved; the abnormal response intensity of the water disaster hidden danger in front of the tunneling working face is effectively enhanced, and the effective detection distance of advanced detection of the tunneling electric method is increased.

The invention discloses a coal-series gas carbon dioxide production increasing simulation method based on a low-field nuclear magnetic resonance technology, and belongs to the technical field of coal-series gas development. The method specifically comprises the following steps: (1) simulating gas bearing conditions of different lithologic reservoirs under a waste condition; (2) identifying the occurrence state of polymorphic CH4 in each lithologic reservoir based on a low-field nuclear magnetic resonance technology; (3) CO2 is injected into all the lithologic reservoirs, and the CO2 air inflow in all the lithologic reservoirs is recorded in real time; (4) quantitatively representing the phase change of the multiphase fluid along with the CO2 injection time after the CO2 enters each lithologic reservoir based on the dynamic quantification of the multiphase fluid; and (5) constructing a response surface model, and determining the optimal injection condition of CO2. According to the method, the CO2 injection amount, the multi-state CH4 occurrence state change and the multi-phase fluid phase evolution in different lithologic reservoirs under the waste condition are monitored in real time, data support is provided for optimizing parameters such as CO2 injection pressure, temperature and duration, and the double targets of efficient utilization of coal series gas residual resources and CO2 geological sequestration are achieved.

The present application provides a kind of coal-based mesophase pitch and its preparation method, belong to pitch preparation technical field.The preparation method includes the following steps: coal-based raw pitch is pretreated, and refined coal pitch is obtained;Distillation is carried out on refined coal pitch, and distillation coal pitch is obtained;Heat polycondensation reaction is carried out on distillation coal pitch, and coal-based mesophase pitch is obtained.The present application uses single coal-based raw pitch as raw material, with the help of the combination of pure physical purification of refining-distillation, cooperatively removes impurities and controls material composition, reduces the quinoline insoluble content of coal pitch to below 0.1wt%.On this basis, through non-catalytic heat polycondensation reaction, the mesophase conversion rate is significantly improved, and the performance consistency of the obtained product as carbon material precursor is improved.The process is simple, controllable, energy-saving and cost-effective, which provides a reliable technical path for the high-value utilization of coal tar pitch and the large-scale stable production of high-end carbon materials.

The invention relates to a comprehensive evaluation method for standard extraction of a coal seam group in a coal measure stratum, which belongs to the technical field of gas extraction evaluation and comprises the following steps: S1, when a target coal seam is mined, defining a coal seam group range in the coal measure stratum; s2, determining comprehensive evaluation indexes of the coal seam group; and S3, comprehensively evaluating the coal seam group. By considering the influence of the close-range coal seam group on the mining protection layer, the comprehensive gas content of the multiple coal seam groups in the coal measure strata is comprehensively calculated, so that the mining layer evaluation index is more accurately determined. According to the method, the gas control during the working face recovery period is more scientifically guided and accurately predicted by comprehensively performing standard judgment on the short-distance coal seam group, and the problems of working face gas overrun after a single coal seam judgment index fails and the like are solved.

The utility model discloses a coal quality analyzer suitable for analyzing unconventional gas reservoirs of coal series. The coal quality analyzer comprises a workbench, an analysis box body fixed at the top of the workbench, and a low-temperature frame and a high-temperature frame which are sequentially arranged in the analysis box body from top to bottom, a switching mechanism is arranged in the analysis box body and comprises an upper sealing plate arranged between the top of the low-temperature frame and the inner side of the analysis box body and a middle sealing plate arranged between the bottom of the low-temperature frame and the top of the high-temperature frame; when a coal sample is analyzed, through the cooperation of a power assembly, an upper sealing plate, a middle sealing plate, a lower sealing plate, a communicating groove, a low-temperature frame, a high-temperature frame, a heating layer and a pressure sensor, the coal sample can be quickly and nondestructively transferred into the high-temperature frame for subsequent volatile component analysis after the water analysis of the coal sample in the low-temperature frame is completed; therefore, the continuity of the analysis process is realized, and the analysis efficiency and accuracy are greatly improved.