369 results about "Coal particle" patented technology

The invention relates to the field of power equipment control data processing, in particular to a boiler combustion optimization control method based on data driving, which comprises the following steps of: acquiring multi-source data such as temperature field distribution, air and smoke pressure, smoke components and coal quality characteristics, and eliminating noise interference by adopting sliding window mean filtering; generating a standardized feature matrix in combination with principal component analysis and a dynamic time warping algorithm; constructing a dynamic coupling model fusing a gradient boosting decision tree and a long short-term memory network, analyzing a nonlinear relationship between pulverized coal particle size distribution and a wind-coal ratio, and predicting combustion efficiency, pollutant concentration and temperature field uniformity; and model parameter self-correction and weight dynamic adjustment are triggered through actual combustion data feedback, and a closed-loop control link is formed. According to the method, accurate modeling of the multi-physical field coupling characteristic of the combustion system is achieved, the time sequence generalization ability under the dynamic working condition is improved, and the purposes of heat efficiency improvement and pollutant emission reduction are effectively balanced.

The invention relates to a coal pulverizing system fine control method based on pulverized coal flow characteristics. The method comprises the following steps: firstly, acquiring an original sound wave signal in the flowing process of pulverized coal, and performing spectral decomposition and feature extraction adjustment on the original sound wave signal to obtain a real-time change trend of pulverized coal fineness distribution; then obtaining the electrified signal intensity of the pulverized coal particles and combining with the real-time change trend for analysis to obtain an accurate measurement value of the pulverized coal flow velocity; then, inputting the real-time change trend and the accurate measurement value of the pulverized coal flow velocity into a particle kinematics model, and calculating to obtain a dynamic estimation value of the pulverized coal concentration; the real-time change trend, the accurate measurement value of the pulverized coal flow velocity and the dynamic estimation value of the pulverized coal concentration are fused, and comprehensive monitoring parameters of pulverized coal flow are generated; and finally, dynamically adjusting a control instruction in the powder making process according to the comprehensive monitoring parameters, and finally obtaining multi-parameter monitoring data. The powder making efficiency and powder making refinement are effectively improved, and the stability and high efficiency of operation of a powder making system are guaranteed.

The invention relates to a boiler flue gas temperature dynamic compensation method based on CFD-reinforcement learning, and belongs to the technical field of boiler operation control. The method comprises the steps that boiler operation parameters and flue gas temperature data are collected in real time, a multi-scale coupling three-dimensional CFD model is constructed, a macroscopic gas-solid two-phase flow-combustion reaction-radiation heat transfer coupling algorithm and a microcosmic pulverized coal particle combustion dynamics algorithm are fused, and hearth and flue temperature distribution is simulated and output; building a CFD-reinforcement learning fusion agent based on a CFD model, taking similar working condition agent parameters as initial values, combining historical and virtual data staged training, and reinforcing the weight of a key temperature measurement point through a focusing regulation and control strategy; an echo state network-predictive control collaborative algorithm is adopted, real-time data are input to obtain an initial adjustment amount, and after security constraint optimization, a compensation execution mechanism is controlled to act. The flue gas temperature is accurately and dynamically compensated, the adaptability to complex working conditions is improved, and equipment safety and operation efficiency are both considered.

The invention belongs to the technical field of coal transportation control, and particularly discloses a top coal working face coal transportation equipment control system which comprises a coal flow distribution scanning module, a directional migration control module, a cooperative regulation and control module and an anti-rebound maintaining module which are sequentially coupled and connected. A complete control link from coal flow state sensing to migration regulation and control execution to dynamic stability maintenance is formed, and local accumulation upheaval areas and sunken areas formed in the scraper conveying process are identified based on coal flow section three-dimensional point cloud data obtained on a scraper conveyor in real time. In combination with a piezoelectric ceramic actuator array arranged at the bottom of the conveyor, directional stress traveling waves pointing to a concave area from a raised area are excited in a target area through phase difference control, local active migration regulation and control of coal particles are achieved, the method can accurately act on areas with uneven coal flow, interference to other areas is reduced, and the coal conveying efficiency is improved. And aggravation of imbalance of coal flow distribution is effectively inhibited.

The invention provides an operation regulation and control method for a pulverizing unit matched with a coal-fired boiler during thermal power peak shaving, and belongs to the technical field of deep peak shaving boilers of coal-fired power plants. The operation regulation and control method comprises the following steps: determining a first typical particle size distribution interval when the coal-fired boiler is in a normal state and a second typical particle size distribution interval when the coal-fired boiler is in a peak regulation state, and establishing a mathematical intelligent model between the coal-fired particle size and the thermal power generation system performance; the number and working parameters of flour mills are configured; and when the thermal power generation system is in a normal state or a peak regulation state, according to the calculated fire coal granularity requirement, in combination with the real-time monitoring data and the optimization result of the mathematical intelligent model, determining and starting a corresponding number of flour mills, and dynamically adjusting the working parameters of the flour mills. The number of the flour mills is increased on the basis of one original flour mill, and the running states of the flour mills are finely regulated and controlled, so that the flour mills can efficiently run under different working conditions, and the requirements of a thermal power generation system are met.

The invention relates to the technical field of computer fluid dynamics, in particular to a coke oven carbonization chamber numerical simulation model based on a CPFD method, which comprises the following steps: carrying out structural grid division to generate a computational domain grid for solving a carbonization process; setting physical property parameters, boundary conditions, initial conditions and chemical reaction kinetic parameters of the coal particles and the gas phase; a CPFD multiphase coupling model is constructed; solving the CPFD multiphase coupling model to obtain dynamic evolution data of pyrolysis gas flow, coupling heat transfer and chemical reaction processes in the carbonization chamber; and outputting simulation results of a temperature field, a pressure field, a gas component concentration field and coal pyrolysis product distribution in the carbonization chamber. The method has the advantages that the particle swarm is regarded as a quasi-continuous medium for statistical description, and the optimal balance is ingeniously obtained between the calculation efficiency and the calculation precision, so that full-size and high-fidelity numerical simulation of dense gas-solid two-phase flow and reaction process involving millions of particles in an industrial-scale coke oven carbonization chamber becomes possible.

The invention relates to the technical field of coal mining, in particular to a dry coal preparation control system based on data analysis, which comprises a real-time data acquisition module, a data analysis module, a self-adaptive control module and a feedback optimization module. The real-time data acquisition module acquires information such as granularity, density, images and moisture of coal particles through a granularity sensor, a density sensor, an image sensor and a humidity sensor, and transmits data to the central processing unit. And the data analysis module analyzes the collected data based on a random forest algorithm to generate a sorting precision prediction value. The self-adaptive control module dynamically adjusts key parameters of the coal dressing equipment according to the predicted value by utilizing a PID control algorithm, and the key parameters comprise the wind speed, the screen inclination angle, the material flow speed and the like. The system not only improves the coal dressing precision and stability, but also improves the self-adaptive capacity of the equipment through intelligent control and optimization, and the system is suitable for popularization and application. The method has remarkable economic benefits and wide application prospects.

The invention relates to a method for preparing ultra-pure coal through combination of grinding and flotation. The method comprises the following steps: carrying out primary surface modification and flotation to remove most of gangue; fine silt on the surfaces of the coal particles is removed through scrubbing and ore grinding, and the hydrophobicity of the coal is improved by combining secondary surface modification and flotation; the coal quality is judged according to the ash content of secondary flotation clean coal, if the ash content is larger than 3%, dissociation ore grinding and grading are conducted, and it is guaranteed that coal and gangue are fully dissociated; double-emulsion surface modification is adopted to enhance the dispersibility of the agent, and finally, the ultra-pure coal with the ash content smaller than 1% is obtained through three-time flotation and four-time flotation. Through the synergistic effect of scrubbing ore grinding, dissociation ore grinding and multi-section flotation, the dissociation efficiency and flotation selectivity of coal and gangue are effectively improved, the method adapts to coal quality fluctuation, and the yield of ultra-pure coal is increased.

The utility model discloses a high-quality fly ash efficient winnowing device which comprises a winnowing box, an air inlet is formed in one end of the winnowing box, two sets of angle-adjustable baffles are arranged in an inner cavity of the winnowing box in the air inlet direction, each set of baffles is movably connected with a set of first collecting pieces, and the heights of the two sets of baffles are gradually increased. The angle-adjustable baffle can be flexibly matched with pulverized coal with different sources and different particle distributions, particles with different particle sizes can be effectively separated by adjusting the angle of the baffle when the particle size distribution of the pulverized coal particles changes, the winnowing efficiency is greatly improved, and the winnowing efficiency is improved. By accurately controlling the angle of the baffle, the winnowing process can be more stable, it is guaranteed that the quality of collected fly ash is uniform, the production requirement of high-quality fly ash is met, and meanwhile the adaptability of the winnowing device to different wind forces is enhanced.

According to the anti-blocking device for the feed opening of the coal feeder based on the synergistic effect of vibration and airflow, a synergistic anti-blocking mechanism is formed through the vibrators on the outer side of the outer sleeve and the air nozzles distributed in the circumferential direction, and the vibration force of the vibrators can break through an arch bridge which is likely to be bonded when the humidity of fire coal is high and likely to be formed when the granularity is uneven; compressed air is jetted into the cylinder through the air nozzle and can directly blow away locally accumulated pulverized coal remaining after vibration, meanwhile, fine pulverized coal particles attached to the inner wall of the discharging port are removed, the hidden danger of blockage is further eliminated, and the problems that traditional manual cleaning is large in labor intensity and low in operation efficiency and has potential safety hazards are effectively solved. The defects of equipment abrasion and newly increased blocking points caused by direct contact of a mechanical dredging structure and pulverized coal are avoided, pulverized coal accumulation balance can be broken without frequent manual intervention, particles attached to the inner wall can be removed, the pulverized coal fluidity is remarkably improved, blocking of a discharging opening is stably prevented, and continuity and stability of the fire coal conveying process of a thermal power plant are guaranteed.

The utility model provides a primary air powder concentration measuring device and a heat supply system, and belongs to the technical field of concentration measurement, and the device comprises an electrostatic loading system which is used for carrying out charge loading treatment on electrostatic ions on the surfaces of all pulverized coal particles when a power plant is in a low load state, so that all the electrostatic ions reach a saturated state; each electric charge quantity measuring sensor is used for measuring the total electric charge quantity of the static ions reaching the saturation state; each signal detection sensor is used for detecting charges generated when the static ions reaching the saturation state flow through and generating electric signals; and the controller is used for calculating the pulverized coal mass flow according to the electric signal generated by the signal detection sensor, and calculating the primary pulverized coal concentration in the pulverized coal pipeline according to the total charge quantity of the electrostatic ions and the pulverized coal mass flow. According to the scheme, the primary air powder concentration can be accurately measured under the condition of low load of the power plant.

The invention relates to the technical field of transmission control, in particular to an intelligent coal preparation plant network security monitoring system, which comprises an interference data acquisition module, a transmission data acquisition module, a real-time transmission data acquisition module and an equipment area division module, acquiring a planar map of the coal preparation plant to obtain each divided area, and extracting interference features and load features of each divided area; the real-time monitoring module is used for determining the interference state of each divided area in a monitoring period and constructing a coupling model between the coal particle dust concentration and the main frequency so as to update the interference state of the divided area, the line state monitoring module is used for judging the data transmission state of each virtual line, and the data transmission control module is used for establishing a real-time information transmission map. And the transmission process of the transmission data is controlled by the real-time information transmission map. According to the invention, the security of network transmission of the coal preparation plant is effectively improved.

The invention provides a microwave pulse electric field vibration synergistic fracturing and permeability increasing gas extraction promoting device and method, and relates to the technical field of low-permeability coal seam fracturing and permeability increasing. According to the method, multi-physical field coupling synergistic interaction is achieved, and the fracturing efficiency and range are greatly improved. According to the invention, deep collaboration of multiple physical fields is realized through a specific time sequence and energy ratio. The thermal stress generated by microwave preheating enables a large number of microcracks to be generated in the coal body and soften the coal quality, and the resistivity and the medium strength of the coal body are reduced. In the state, the pulsed electric field with lower voltage can preferentially and effectively break down and expand the fracture network along the micro-fracture path; meanwhile, high-frequency mechanical vibration not only efficiently transmits energy to the tip of the fracture to generate stress concentration to promote extension of the fracture, but also disturbs coal particles to promote gas desorption. Through three-field cooperation, cracks can be more efficiently initiated, expanded and communicated in a three-dimensional space, a three-dimensional complex crack network far beyond the action range of a single technology is formed, and the overall permeability of a coal seam is remarkably improved.

The disclosure provides a coal conveying control system and method for a thermal power plant. The system includes: a model prediction module, used for building an operating load prediction model, and obtaining a boiler operating load optimal value; a load calculation module, used for drawing an operating load difference value curve, and determining a boiler coal consumption change amount; a speed control module, used for determining a coal conveying amount of a coal conveying system, and controlling operating speed of a coal conveying belt according to the coal conveying amount; a quality calculation module, used for calculating boiler operating efficiency, and determining a coal quality parameter according to the boiler operating efficiency; a fineness control module, used for determining a coal particle parameter, setting target coal particle fineness according to the coal particle parameter, and controlling a screening and crushing device according to the target coal particle fineness.

The invention discloses a coal crushing and screening equipment load adaptive cooperative control method, and relates to the field of coal processing, and the method comprises the steps: forming a coal database based on historical crushing data; the target coal type, the actual crushing coefficient and the actual quality are obtained; identifying to obtain a first crushing coefficient of the first sample state and a second crushing coefficient of the second sample state; constructing a crushing action function based on the test data; generating target power during actual crushing; and verifying the target power, and when the target power has the risk of insufficient crushing, correcting the target power of coal crushing to obtain a target corrected power. According to the method, the coal database is formed, the coal is identified, the crushing action function is constructed, the target power during actual crushing is generated, the target power is verified, the power during coal crushing is specifically set, and the power is corrected, so that the crushed coal particles can meet the production requirements.

The invention discloses a pulverized coal flow velocity detection method and device, electronic equipment and a storage medium. The method comprises the following steps: determining the particle size of pulverized coal particles; determining a first model according to the particle size of the pulverized coal particles; performing motion trail tracking on the pulverized coal particles in the second image according to the first model to obtain a motion trail of the pulverized coal particles; displacement information of the pulverized coal particles is determined according to the movement track, and the pulverized coal particle flow velocity is determined according to the displacement information. According to the method, the first model is matched according to the particle size, trajectory tracking is performed according to the first model, different tracking models can be adopted for different particle sizes, and the trajectory tracking accuracy is improved; and the pulverized coal particle flow velocity is determined according to the tracked motion trail, so that the accuracy of pulverized coal particle flow velocity determination can be improved.

The invention discloses a device for improving the specific surface area and adsorption performance of coal gasification fly ash in the field of coal gasification fly ash treatment, and the device comprises a gasification assembly which comprises a feed inlet and a gas inlet and is used for gasifying fine coal particles to generate a coal gas mixture; the feeding end of the cyclone separation assembly is connected with the discharging end of the gasification furnace, and the cyclone separation assembly is used for separating particulate matters and gas in the coal gas mixture; the feeding end of the dust removal assembly is connected with the discharging end of the cyclone separation assembly; the feeding end of the calcining assembly is connected with the discharging end of the dust removal assembly through a transmission assembly; the atmosphere assembly is communicated with a calcining cavity in the calcining assembly; the invention further discloses a processing method. The device has the beneficial effects that the calcination assembly and the atmosphere assembly are arranged, fly ash subjected to multi-layer filtering operation is subjected to inert gas atmosphere calcination treatment, CO2 emission in the calcination process can be effectively inhibited, the structure and performance of the fly ash are effectively improved, and the adsorbability of the fly ash is better.

This invention relates to the field of pulverized coal conveying and dust removal technology, specifically to a pulverized coal dust removal method, comprising: S1: Constructing a dust removal system: setting up a dust cover on a conveyor belt, setting up a pressure-reducing chamber on the dust cover, installing wear-resistant baffles at the bottom of the dust cover, and installing a dust curtain inside the dust cover; installing a dust collector at the top of the dust cover; S2: Coal conveying and primary dust removal: starting the conveyor belt to transport coal, the coal falls onto the conveyor belt, and the generated dust-laden gas forms a local high-pressure zone under the obstruction of the dust curtain, causing a portion of the dust-laden gas to undergo primary filtration through the filter components on the pressure-reducing chamber; S3: Secondary dust removal: the remaining dust-laden gas in the dust cover is sucked into the dust collector, the dust-laden gas enters below the liquid surface of the dust collector, causing the pulverized coal particles to settle and form coal slurry, which is then transported outside the dust collector, and the purified gas is discharged through the outlet. This method achieves closed-loop control of the entire process from source dust suppression to end-of-pipe treatment through two-stage synergistic dust removal, improving the dust removal effect.

The utility model provides a coal bucket anti-blocking structure of a coal conveying system, which relates to the field of coal conveying systems and comprises a coal bucket body, the coal bucket body is divided into a plurality of inclined sections and vertical sections which are alternately arranged, and a vibration component is mounted on the outer side of the coal bucket body. The vibration assembly comprises a plurality of vibration balls, a gear ring driving the vibration balls to rotate and a plurality of vibration plates used for transmitting vibration, the vibration balls make contact with the vibration plates in the rotating process, and the vibration plates extend to the inner side of the coal bucket body. The friction force superposition effect caused by the continuous conical section can be reduced, so that the blocking phenomenon of coal particles is effectively reduced, the vibration plate is knocked by the vibration ball, the vibration plate and the coal bucket body are continuously vibrated, retention of the coal particles on the inner wall of the coal bucket due to extrusion friction can be effectively reduced, blocking is prevented, and the service life of the coal bucket is prolonged. And continuous and coherent coal conveying operation is ensured.

The present application provides an anti-blocking coke making system and method, the system comprising: a coke making furnace, a vibrating screen machine, a cooling machine and a conveying mechanism. The method comprises: raw coal particles enter the coke making furnace, and pass through a pre-carbonization section, a carbonization section and an activation section in turn, wherein aluminum oxide balls are introduced into the carbonization section to mix and heat with carbonization material, and the carbonization material is activated in the activation section to obtain active coke, which is discharged from a discharge port together with the aluminum oxide balls; the active coke and the aluminum oxide balls are separated in the vibrating screen machine, wherein the active coke is cooled in the cooling machine, and the aluminum oxide balls are sent back to the carbonization section of the coke making furnace by the conveying mechanism for recycling. The present application uses aluminum oxide balls as catalysts to decompose heavy tar with high viscosity into light tar with low viscosity, preventing the blocking problem caused by the mixture and agglomeration of tar and dust, and the catalysts can be recycled.

This utility model discloses an energy-saving coal particle conveying system based on circulating waste heat air, relating to the field of coal particle conveying technology. It includes a furnace, a screw conveyor, a motor, a heating tank, and an auger. A preheating mechanism is provided on the side of the furnace, comprising a heating tank, an air duct, and a fan. The heating tank is connected to the side of the air duct, and the air duct is fixedly connected to the top of the fan. This structure integrates waste heat collection with coal particle conveying, shortening the waste heat transmission path and reducing heat loss. Simultaneously, the fan delivers waste heat air to the heating tank through the air duct, forming a directional circulation channel, ensuring that the hot air acts evenly on the coal particle conveying path, improving pre-drying efficiency. A blower is configured in the bottom combustion chamber below the furnace, which can precisely control the amount of combustion air input, allowing for more complete fuel combustion and providing a stable heat source for the waste heat air system.

The application discloses a kind of concentrated pool coal-water interface video image recognition device and method, comprising: sequentially connected concentrated pool fixed module, mobile module, image acquisition module and image processing module;The mobile module uses movable guide rail, under the guidance of the concentrated pool fixed module, the video information in the concentrated pool is collected by the image acquisition module, and based on image processing module, the video information is analyzed and processed, the number of coal particles is obtained, and then the coal-water interface is identified.The application has the characteristics of non-contact and intelligence by image processing method, with the help of the relatively mature image processing technology and data transmission technology, the dependence on hardware such as sensor is lower, and it is easy to upgrade and transform.

The invention discloses a coal crushing device for thermal power generation, and relates to the technical field of coal crushing, and the coal crushing device comprises a crushing frame arranged at the top of the ground; the feeding hole is formed in the front side of the crushing frame; the feeding frame is fixedly mounted on the inner wall of the feeding hole; the discharge port is formed in the front side of the crushing frame; the discharging plate is fixedly mounted on the inner wall of the crushing frame; the driving equipment is fixedly mounted on the left side of the crushing frame; the crushing roller is fixedly mounted at the output end of the driving equipment; the friction force between the coal on the cambered surface and the crushing roller is increased through reciprocating pressing of the pressing frame, the friction force between the coal and the crushing roller can be increased through reciprocating pressing, coal particles can be crushed more easily, the crushing effect of the coal can be more remarkable, and therefore the crushing efficiency is improved.

The invention relates to the technical field of coal briquette processing, and discloses coal briquette pulverizing equipment which comprises a supporting seat, a screening box is fixedly connected to the top of the supporting seat, a pulverizing cylinder is fixedly connected to the top of the screening box, a feeding hopper is fixedly connected to the top end of the pulverizing cylinder, a first pulverizing mechanism is arranged in the pulverizing cylinder, and a second pulverizing mechanism is arranged in the supporting seat. And an air outlet hole is formed in the inner wall of one side of the screening box, a fan is fixedly connected into the air outlet hole, a slope block is fixedly connected to the inner wall of the bottom of the supporting base and is opposite to the fan, and a first clamping plate is fixedly connected to one side of the slope block. According to the coal briquette grinding device, the inner grinding disc is driven by the double-shaft-extension asynchronous motor to rotate, so that coal briquettes are ground under the cooperation of the outer grinding disc, then the rotating shaft is driven by the double-shaft-extension asynchronous motor to rotate, so that the grinding arms are driven to rotate on the grinding disc, coal particles are ground, and the coal briquettes are fully ground.

The invention relates to the technical field of coal water slurry additives, and discloses an anti-precipitation coal water slurry additive and a preparation method thereof, the anti-precipitation coal water slurry additive comprises the following raw materials by weight: 10-20 parts of modified nano silica, 30-40 parts of a bio-based dispersant prepared from corn straw, 5-10 parts of an ionic liquid stabilizer, and 3-5 parts of a compound synergist; the method comprises the following steps: S1, pretreating corn straws and preparing modified nano silicon dioxide; and S2, weighing the components according to the proportion, dispersing, and grinding and granulating after the dispersion is completed. The modified nano S < iO2 > is adsorbed on the surfaces of coal particles as a'rigid core ', and sedimentation is inhibited through steric hindrance; the ionic liquid forms a flexible shell, the interfacial tension is reduced, and the low-temperature fluidity is improved. The corn straw is used for replacing a traditional petroleum-based dispersing agent, and the cost is reduced by 40% or above. The compounded synergist automatically adjusts the pH value of the slurry to 8-9 according to the environment, and prolongs the stable period to 30 days.

The utility model discloses a storage stirring device for testing fuel coal in a power plant, which relates to the technical field of fire coal stirring and comprises a stirring box and a base, one side of the stirring box far away from the base is fixedly connected with a feed port, the side face of the stirring box is provided with a discharge port, the bottom of the stirring box is provided with a stirring component, and the stirring component comprises a stirring rod and stirring blades. An adjusting assembly is arranged between the stirring box and the base, the adjusting assembly comprises a connecting plate, coal in the stirring box is stirred through the stirring assembly, up-down repeated movement and autorotation are conducted in the stirring process, the stirring effect of coal particles can be further improved, stirring is more sufficient, and the stirring efficiency can be improved; and the stirring box is in an inclined state during discharging through the adjusting assembly, so that the coal particles are better discharged, the coal particles are not easy to remain in the shell, the use is relatively convenient, and the operation state of the device can be controlled through the driver.

The utility model relates to a vertical fluidized bed furnace with more sufficient combustion, which is characterized by comprising a feeding machine and a vertical combustion furnace, the discharge end of the feeding machine is provided with a first conveying belt, the discharge end of the first conveying belt is provided with a lifting conveying belt, the discharge end of the lifting conveying belt is provided with a roller screen, the discharge end of the roller screen is provided with a lifting machine, and the discharge end of the lifting conveying belt is provided with a second conveying belt. The discharging end of the elevator is provided with a transfer bin, the discharging end of the transfer bin is connected with a feeding port of the vertical combustion furnace, the bottom of the vertical combustion furnace is connected with a centrifugal fan, the top of the vertical combustion furnace is connected with a cyclone dust collector, and the discharging end of the cyclone dust collector is connected with a drying tower. The combustion main furnace is arranged to be of a vertical structure, rotating airflow is added to the bottom of the combustion main furnace, large-particle coal particles are blown up to be combusted repeatedly, and the coal particles are combusted more sufficiently.

The invention discloses a treatment method for enhancing the seepage capacity of a reservoir and an extraction method of unconventional natural gas, and relates to the technical field of reservoir extraction. According to the method, hydraulic fracturing operation is conducted on a target reservoir with the seepage capacity to be improved in the coal rock reservoir, oxygen injection ignition operation is conducted on the target reservoir through an underground instrument string, coal rock of the target reservoir is combusted and heated to the target temperature at which the structure of the coal rock changes, the structure of the coal rock changes in the temperature rising process, and the phenomenon of softening and melting is generated; when the operation result of the oxygen injection ignition operation reaches a preset target, the operation is stopped, a wellhead communicated with a shaft is closed, after the closing duration of the wellhead reaches a preset duration, pulverized coal particles around the hydraulic fracture are consolidated to the wall surface of the hydraulic fracture, and the pulverized coal particles and a propping agent filled in the hydraulic fracture form a high-strength, good-permeability and high-strength hydraulic fracture supporting agent. And the coal powder barrier can be blocked, so that the reservoir seepage capacity of the coal rock reservoir is improved, and the damage of coal powder falling to the fracture seepage capacity is solved from the source.

The power plant coal conveying pipeline particle filtering and recycling device comprises a cross-shaped support, a first limiting sliding groove is formed in the cross-shaped support, a first limiting sliding block is installed in the first limiting sliding groove in a sliding mode, and a rotating motor is fixedly connected to the rear portion of the first limiting sliding block; the output end of the rotating motor penetrates through the first limiting sliding block to be fixedly connected with a screening pipe, a filter screen is fixedly connected into the screening pipe, sealing sleeves are vertically and symmetrically connected to the screening pipe in a sleeved mode, connecting pipes are vertically and symmetrically fixedly connected to the front face of the cross-shaped support through a support, and the sealing sleeves are matched with the connecting pipes. A first air cylinder is fixedly connected into the first limiting sliding groove. The first air cylinder is started to drive the screening pipe to move, then the rotating motor is used for driving the screening pipe to rotate, the screening pipe is made to be inverted, then coal particles screened in the screening pipe are poured into the collecting box, and discharging, recycling and reusing of the screened coal particles can be automatically completed.

The utility model relates to the technical field of iron and steel smelting, and discloses a controllable coal injection device for blast furnace ironmaking, which comprises a crushing box and a mixed belly pipe, a first motor is fixedly arranged on the crushing box, the output end of the first motor is fixedly connected with a driving gear I, the driving gear I is fixedly connected with a first crushing roller, and the first crushing roller is fixedly connected with a second crushing roller. A first driven gear is connected to the first driving gear in a meshed mode, a second crushing roller is fixedly connected to the first driven gear, and a slope block is arranged in the crushing box. According to the coal injection device, large coal is refined into fine-particle coal powder step by step through the two procedures of crushing and grinding, the surface area of the coal powder is increased through the refined treatment, the coal powder can make contact with oxygen more easily, and therefore the combustion efficiency of the coal powder is remarkably improved, and in the combustion process, the combustion efficiency of the coal powder is greatly improved. And the smaller pulverized coal particles can be combusted more quickly, more heat energy is released, the reduction reaction in the blast furnace is promoted, and the ironmaking efficiency is improved.