156 results about "Pulverized fuel ash" patented technology

The invention discloses a coal slime flotation dosage dynamic prediction method and system based on multiple working conditions, and relates to the technical field of mineral processing process control, and the method comprises the steps: based on coal slime particle data, employing a density clustering algorithm to carry out preliminary dynamic division on real-time working conditions, generating initial working condition labels, and through a time sequence correlation analysis and dynamic correction mechanism, carrying out dynamic prediction on the real-time working conditions; optimizing the initial working condition label to generate a multi-working condition label; a flotation cell simulation model is constructed, advanced simulation is conducted according to the real-time working condition operation parameters, the clean coal ash value and the recovery rate in a future time window are predicted, dynamic calibration is conducted, and a chemical adding amount adjusting instruction is generated; and executing the dosage adjusting instruction, evaluating the coal slime flotation efficiency through a multi-dimensional flotation dynamic evaluation method, and dynamically optimizing the dosage adjusting instruction according to an evaluation result. A flotation cell mechanism model is established, a predicted value is dynamically calibrated through parameter inversion and extended Kalman filtering, a dosing instruction is generated in combination with MPC, and advanced precise regulation and control of clean coal quality and recovery efficiency are achieved.

The invention provides a circulating fluidized bed boiler load self-adaptive control system and method, and belongs to the technical field of circulating fluidized bed boiler load self-adaptive control. In order to realize in-boiler temperature regulation based on dynamic conveying of settled ash in a boiler and realize efficient active matching of heat transfer capability in a quick response load process of the boiler, the technical scheme is that the top of a hearth of the circulating fluidized bed boiler is communicated with the top of a cyclone separator through a coal ash recovery pipeline, and the top of the cyclone separator is connected into a tail flue; an economizer is arranged in the middle of the tail flue, and a flue outlet is formed in the bottom of the tail flue; the bottom of the cyclone separator is connected with a circulating ash returning device through an outlet pipeline, a settled ash conveying hole is formed in the upper part or the side part of the circulating ash returning device, and a conveying pipeline is welded on the outer side of the settled ash conveying hole and is connected with the bottom of a hearth of the circulating fluidized bed boiler; the method is used for self-adaptive control of the load of the circulating fluidized bed boiler.

The utility model discloses a coal powder cleaning device for coal belt cleaning relates to cleaning device technical field. A coal powder cleaning device for coal belt cleaning, including belt conveying table and fixed base, belt conveying table fixed connection is at the top of fixed base, the ash cleaning structure is located on the fixed base, and the ash cleaning structure is including cleaning box, two support plates, two electric telescopic link, cleaning roller brush, driving motor and cleaning scraper, and the mechanical friction of cleaning roller brush removes the ash that sticks to the belt surface, and the cleaning scraper is scraped to remove the ash that remains the roller brush, effectively avoids secondary pollution, compared with single ash scraping plate cleaning, can handle big granular ash and adhered dust simultaneously, simultaneously, the negative pressure dust collection channel that exhaust fan, dust collection square pipe and dust collection mouth constitute can capture suspended fine dust in time, solve the problem that only rely on ash scraping plate cleaning leads to small granular dust to drift in traditional, realize the all -round cleaning to the ash on the belt surface.

The invention discloses a circulating blast furnace top gas high-temperature reforming system and method, and relates to the technical field of circulating blast furnaces. The circulating blast furnace top gas high-temperature reforming system comprises a circulating blast furnace, a gasification furnace device, a reformed gas treatment module and a waste heat recovery module, the gasification furnace device is connected with the circulating blast furnace, and the reformed gas treatment module is connected with the gasification furnace device and the circulating blast furnace. The reformer device is configured to receive the reformed gas discharged by the gasifier device, treat the reformed gas and then input the treated reformed gas into the circulating blast furnace; and the waste heat recovery module is configured to receive coal ash discharged by the gasification furnace device and preheat lump coal entering the gasification furnace device by utilizing waste heat of the coal ash. Based on the technical scheme disclosed by the invention, the heat utilization rate in the coal gasification process is remarkably improved, the energy consumption in the coal gas reforming process is reduced, and resource utilization and low-carbon clean development of metallurgical coal gas can be realized.

The utility model discloses a dust suppression device for a coal conveyor, which effectively realizes a better dust suppression effect and comprises a conveyor belt driven by the coal conveyor and used for conveying coal, a collecting box for collecting pulverized coal is arranged on the lower side of the conveyor belt, two rollers are abutted against the lower side of the conveyor belt, and the rollers are arranged on the lower side of the conveyor belt. The lower side of each roller is provided with a scraping plate used for scraping coal powder on the outer side of the roller, a movable adjusting plate is arranged in the collecting box, the bottom of each scraping plate is rotationally connected with the adjusting plate, and a spraying mechanism used for dust suppression is arranged in the collecting box. The device is simple and convenient to operate, the purpose of conveniently cleaning the conveying belt is effectively achieved, a worker can conveniently install the device and conveniently operate the device, the function of adjusting the pressing force is added, and collected coal ash can be conveniently removed.

A method for accurately and efficiently desodium of high-sodium coal, comprising the following steps: detecting the moisture M of the high-sodium raw coal to be treated t , calculating the total sodium content M of the wet basis coal sample Na , converting the total sodium content M of the dry basis coal sample Na , determining the Na2O content in the ash of the high-sodium raw coal to be treated; selecting the key factors affecting the desodium rate; establishing the relationship model between the key factors and the actual desodium rate; according to the Na2O content in the ash and the requirements of the standard, the desodium rate of the high-sodium raw coal to be treated is converted, and the Re target value is obtained; the Re target value is brought into the relationship model, and the selection and value of the key factors of the high-sodium raw coal to be treated during desodium treatment are obtained respectively, and finally the actual leaching desodium of the high-sodium raw coal to be treated is carried out to obtain low-sodium coal meeting the requirements. The method can accurately desodium, reduce cost, energy consumption and corrosion and pollution generated in the production process, and has important significance for guiding large-scale application of high-sodium coal desodium.

The embodiment of the invention provides a thermotechnical automatic production feeding device. The thermotechnical automatic production feeding device comprises an elevator and a feeding hopper fixedly connected to the surface of a conveying belt of the elevator. The covering part comprises a plurality of covering plates which are connected to the two sides of the elevator in a sliding mode and can synchronously move along with the feeding hopper, and the covering plates are used for covering the top of the feeding hopper in the lifting process of the feeding hopper. According to the feeding hopper, the covering component is arranged, and the covering plate of the covering component is located on the upper side of the feeding hopper in the lifting process of the feeding hopper and synchronously moves along with the feeding hopper, so that the effect of covering a coal mine in the feeding hopper is achieved, meanwhile, falling of coal briquettes and outward scattering of coal ash are prevented, and the working environment is optimized.

The utility model discloses a device for cleaning coal ash cakes on the inner wall of a boiler, and relates to the technical field of boiler cleaning. The device comprises a base, a collecting mechanism is arranged at the top of the base, a cleaning mechanism is arranged at the top of the collecting mechanism, the cleaning mechanism comprises a boiler tank body, a top plate is connected to the top of the boiler tank body in a height mode, a threaded block is fixedly connected to the top of the top plate, and a top plate is fixedly connected to the top of the top plate. A first motor is started to drive a threaded rod to rotate, at the moment, the threaded rod ascends or descends through a threaded block, a first fixing plate and a second sliding block are pushed to slide in a sliding rail, meanwhile, the first motor is driven to slide, and when the threaded rod moves, a rotating block located at the bottom of the threaded rod is driven to move, and meanwhile an auxiliary rod located on the outer surface of the threaded rod moves at the same time; when the auxiliary rod moves, the first sliding block can be driven to slide in the sliding groove, and meanwhile the ash removing scraper located on the outer wall of the auxiliary rod can slide on the inner wall of the boiler tank body so that coal ash can be agglomerated.

The present application belongs to the field of coal mine drilling, and particularly relates to a reamer for directional long drilling of coal seams; the reamer comprises a reamer barrel, a strip-shaped groove is uniformly formed on the inner wall of the reamer barrel along the circumferential direction, a cutter seat is slidably arranged in the strip-shaped groove, and a cutter wing is mounted on the cutter seat; a top plate penetrating through the cutter seat is further hingedly arranged on the cutter seat, a driving part for driving all the cutter seats to synchronously slide up and down in the strip-shaped groove is further arranged in the reamer barrel, and the cutter wing is used for adjusting the position of the cutter wing protruding from the outer wall of the reamer barrel and further adjusting the cutting diameter during the up-and-down sliding of the cutter seat in the strip-shaped groove; the driving part further cooperates with the top plate to drive the top plate to swing and remove the coal ash in the gap of the cutter wing; the present application reduces the abrasion from layered cutting, cooperates with self-cleaning and heat dissipation to maintain the cutting efficiency, dynamically adjusts the hole diameter and real-time performs the hole wall trimming during the reaming process, and forms a functional closed loop from the local to the whole to jointly solve the problems of tool life, chip removal and hole forming accuracy in the reaming of hard coal seams.

This invention discloses an artificial aggregate prepared using desulfurization solid waste, its preparation method, and its application, belonging to the field of solid waste resource utilization technology. The preparation method includes the following steps: ball milling desulfurization slag to obtain desulfurization slag powder; low-temperature pyrolysis treatment of waste incineration fly ash to obtain pretreated waste incineration fly ash; mixing desulfurization ash, desulfurization slag powder, and pretreated waste incineration fly ash to obtain a raw material mixture; adding water to the raw material mixture and pelletizing to obtain aggregate particles; subjecting the aggregate particles to air curing and mineralization curing sequentially to obtain the final product. This invention also discloses the artificial aggregate prepared by the above method and its application. The artificial aggregate prepared using desulfurization solid waste of this invention has high compressive strength and stable ion storage, which can solve the problems of low strength and high dependence on admixtures in existing coal ash-based aggregates, and has broad application prospects.

The utility model discloses a convenient exhaust valve coal ash cleaning device which comprises an exhaust pipeline, an exhaust valve and a cleaning branch pipe, the exhaust pipeline is provided with the exhaust valve, one side of the exhaust valve is communicated with the cleaning branch pipe, and the end of the cleaning branch pipe is provided with a first flange. A first sealing groove is formed in the end of the cleaning branch pipe, a first sealing ring is arranged in the first sealing groove, a second sealing groove is formed in the end face of the first flange, a second sealing ring is arranged in the second sealing groove, the first flange is fixedly connected with a blind plate flange, the blind plate flange and the first flange are fixedly installed, and sealing installation of the blind plate flange and the cleaning branch pipe is achieved. When ash needs to be cleaned, the blind flange is opened, and air or water is used for cleaning, so that the cost is reduced, the efficiency is improved, and the desired effect is achieved through an easy-to-operate method.

The application discloses a fly ash sampling device of a coal ash conveying system of a thermal power plant, relates to the technical field of coal ash sampling and detection of power plants, and aims to solve the problems of dust pollution and direct spraying of high-temperature ash samples. Coal ash enters and impacts the filter through the connecting part. The pressure of the coal ash main conveying pipe is greater than the pressure inside the fixed ring. The filter collects coal ash until the filter is blocked. At this time, the air pressure is greater than the elastic force of the reset assembly, thereby driving the filter to move downward, so that the inner container filter screen is exposed. At this time, the gas preferentially passes through the inner container filter screen and is discharged from the exhaust cavity, avoiding the problem of fly ash. The air impact ring groove heat dissipation barrel is buffered and enters from the inlet, passes through the heat dissipation channel, is buffered and heat-dissipated, and is discharged from the outlet. Then, the heat is dissipated through the heat dissipation disc and is discharged from the support plate to be heat-dissipated and buffered by the ground. The gas is not only subjected to cooling treatment, but also can be buffered. Finally, the gas discharge pressure and temperature are reduced, and the safety is high.

The invention relates to a high-temperature coal ash oxygen carrier magnetic separation and heat recovery method and system, and belongs to the technical field of coal chemical chain gasification. The system comprises a circulating fluidized bed reactor (a fuel reactor and an air reactor), a gasifying agent supply device, a magnetic separation device, a cyclone separator, an air preheating heat exchanger, a condenser, a gas-liquid separator, a two-way material circulation control device and a heat energy recovery system. The system recycles heat of oxygen carrier particles by taking vapour of a gasifying agent as a fluidizing medium and sends the heat back to the reactor, and the stable self-heating operation of the system is maintained through a double-path material circulation control device. The two bottleneck problems of large mechanical loss of the oxygen carrier and high ash discharge heat loss in the chemical looping process are synchronously solved, heat in the system is recycled, the requirement for an external heat source is remarkably reduced, meanwhile, the oxygen carrier separation efficiency is improved, integrated operation of efficient separation of coal ash, oxygen carrier recovery and heat recovery is achieved, and the industrial production cost is reduced. And continuous and stable self-heating operation of the system is guaranteed under the condition that no extra large amount of heat supply is needed.

The invention provides a dry ash sorting device with an automatic unblocking function, and relates to the technical field of industrial fly ash treatment. Four supporting legs are fixedly arranged at the four corners of the bottom of the sorting box in a vertically downward mode correspondingly, and a coal inlet is vertically formed in one side of the upper end of the sorting box; a separation guide plate which is inclined inwards and downwards is arranged in an inner cavity of the separation box below the coal inlet; and two symmetrical fans are mounted at the top of the sorting box on one side of the coal inlet. The core sorting function of the device is achieved through cooperation of vibration dispersion and wind power sorting, specifically, coal ash is scattered into uniform thin curtains under driving of a vibration motor through an inclined sorting guide plate provided with inverted-V-shaped sorting fins, meanwhile, precise airflow provided by a draught fan is sprayed out of an air conveying pipe and acts on the tail end of the sorting guide plate, and the sorting effect is achieved. In this way, coarse-particle dry ash with the large specific gravity can effectively overcome airflow resistance and directly fall into the discharging box, fine particles are accurately captured by airflow, and therefore the sorting precision and efficiency are greatly improved.

The utility model relates to the field of electromechanical installation auxiliary tools, in particular to a tool storage device for electromechanical equipment installation. The technical problems that according to an existing device, coal ash falling into a box is inconvenient to clean, tools and parts are prone to being corroded, and the protection performance of the tools and the parts is poor are solved. A tool storage device for electromechanical equipment installation comprises a box body, two installation bases are fixedly connected to one side of the box body, a cover plate is rotationally connected between the two installation bases, and torsion springs are arranged between the cover plate and the two installation bases. An air bag is extruded through an extrusion frame and a limiting plate, air in the air bag enters an annular pipe through a cavity and is sprayed out through a nozzle, coal ash on tools, parts and a porous plate is blown down, the coal ash is discharged through a through hole of a box body, and the coal ash falling into the box body can be conveniently cleaned when the box body moves; and the protection performance on tools and parts is improved.

This invention relates to the field of iron and steel metallurgical process optimization technology, and in particular to a method for evaluating the harmfulness of coal ash behavior. The method uses a coal ash behavior harmfulness index to evaluate the degree of harm of coal ash to blast furnace smelting. The harmfulness of coal ash behavior is defined as HICA = [w1 × (K2O + Na2O) + w2 × Fe2O3] × f(ST); where HICA is the coal ash harmfulness index, K2O is the mass percentage of K2O in the coal ash, Na2O is the mass percentage of Na2O in the coal ash, Fe2O3 is the mass percentage of Fe2O3 in the coal ash, w1 and w2 are weighting coefficients, satisfying w1 + w2 = 1 and w1 > w2, ST is the softening temperature of the coal ash, and f(ST) is a temperature correction function. This invention provides a comprehensive and accurate method for quantifying the harmfulness of coal ash to blast furnace smelting, forming a comprehensive indicator that can directly and comprehensively warn of the operational risks of coal ash to blast furnaces.

The utility model provides a detection system for alkali metal conversion in coal-fired power generation. The detection system comprises a settling furnace, a heating device, a gas phase detector, a pulverized coal bunker, a solid phase detector and a separator, one end of the settling furnace is communicated with the pulverized coal bunker; the heating devices are arranged on the furnace wall of the settling furnace at intervals in the axial direction of the settling furnace. The gas phase detector is fixedly arranged at the end, close to the pulverized coal bunker, of the settling furnace. The solid phase detector is communicated with the settling furnace through the separator; after the heating device is started, the gas phase detector detects the metal content of flue gas in the settling furnace, and the solid phase detector detects the metal content of coal ash in the settling furnace. The settling furnace is arranged to simulate the internal environment of a grate-fired furnace or a pulverized coal furnace industrial boiler, after pulverized coal in the pulverized coal bunker enters the settling furnace, products of all stages after pulverized coal combustion are received and detected by the gas phase detector and the solid phase detector respectively, and therefore the conversion process of alkali metal in all stages of pulverized coal combustion is tracked.

The utility model discloses a membrane device applied to coal mine water treatment, which comprises a cleaning tank, a fixed cover is mounted at the upper end of the cleaning tank, a water inlet pipe is inserted into the upper end of the right side of the cleaning tank, and two groups of adjusting mechanisms are mounted on the upper surface of the fixed cover; the cleaning mechanism is installed at the rear end of the upper surface of the adjusting mechanism, two sets of installation frames are installed in an inner cavity of the cleaning pool, a treatment film is installed in the middle of the installation frames, a drainage pipe is inserted into the bottom of the left side of the cleaning pool, and a valve is installed at the rear end of the drainage pipe. The cleaning roller on the mounting plate is used for cleaning impurities on the surface of the treatment film, the treatment film does not need to be detached for cleaning, the cleaning convenience of the device is improved, spraying is conducted on the back face of the treatment film through the cleaning mechanism and the spray head, and a coal ash layer attached to the surface of the treatment film is conveniently washed away through reverse cleaning.

The invention relates to the technical field of gas extraction, in particular to an energy-saving gas pump station separation and purification system. Comprising a cyclone dust removal mechanism, an air exhaust main pump and a working solution filtering mechanism, and the air outlet end of the cyclone dust removal mechanism communicates with the air inlet end of the air exhaust main pump; the working liquid filtering mechanism comprises a solid-gas-liquid separator, a lifting pump and a reflux pump, the solid-gas-liquid separator comprises a separation tank, a solid-gas-liquid separation part and a pore plate assembly, the pore plate assembly divides the separation tank into a secondary separation cavity, a primary separation cavity and a liquid collection cavity which are communicated with one another from top to bottom, and the solid-gas-liquid separation part is mounted in the secondary separation cavity; the solid-gas-liquid separation part comprises a plurality of flow guide cylinders, a plurality of flow guide filter parts arranged in the flow guide cylinders and a liquid distribution disc used for supplying liquid into the flow guide cylinders, and each flow guide filter part comprises a mounting rod and a plurality of inclined flow guide plates uniformly distributed on the mounting rod up and down. The amount of coal ash particles in working liquid can be effectively reduced, the non-uniform wear rate of a pump cavity of the water ring pump is reduced, and the working liquid is saved.

The scraper cleaning device for the coal mining reversed loader comprises a conveying groove, a driving device is arranged in the conveying groove, a scraper chain is arranged on the outer side of the driving device in a transmission mode, a plurality of scrapers are installed on the front side and the rear side of the scraper chain respectively, and installation plates are installed on the front side and the rear side of the top face of the conveying groove respectively. Lifting rods are slidably mounted in the mounting plate in a penetrating mode, elastic assemblies connected with the mounting plate are arranged at the tops of the lifting rods, a U-shaped support is mounted at the lower ends of the two lifting rods, a connecting plate is mounted on the bottom face of the U-shaped support, and a plurality of mounting holes are formed in the surface of the connecting plate. A plurality of vibration transmission pieces used for abutting against the scraper blade are arranged in the mounting hole, and a vibration motor is mounted on the inner side of the U-shaped support. The vibration motor, the U-shaped support and the connecting plate vibrate, the vibration is conducted to the abutting wheel through the connecting plate, the scraper is driven to vibrate, and therefore coal ash attached to the surface of the scraper is shaken off.

This invention relates to the technical field of conveyor belt auxiliary equipment, and discloses a correction device for controlling belt conveying in a coal conveying system. The device includes a cylinder, a mounting plate, and a top plate. The cylinder is mounted on the top of the mounting plate, and the top plate is also mounted on the top of the mounting plate. The mounting plate is bolted to the outside of the frame. When the conveyor belt deviates, the cylinder in the device is activated and performs an action. This action not only automatically corrects the conveyor belt, ensuring its return to normal operation, but also effectively cleans the signal transmitter, preventing sensor sensitivity reduction due to coal ash accumulation. The cylinder's movement generates vibration, which effectively shakes off dust adhering to the cleaning cotton. This process ensures that the cleaning cotton continuously and efficiently cleans the signal transmitter, maintaining its surface cleanliness, thereby guaranteeing the reliability and response speed of the equipment monitoring system.

The application discloses a biomass gasification composite additive of red mud and coal ash, a preparation method and application thereof, and relates to the technical field of biomass gasification and industrial solid waste resource utilization. The raw material of the biomass gasification composite additive comprises a mineral component, the mineral component adopts high-iron red mud and / or high-aluminum coal ash, the oxides in the high-iron red mud include Fe2O3, Al2O3, SiO2 and CaO, and the mass fraction of Fe2O3 is 60-80%; the oxides in the high-aluminum coal ash include SiO2 and Al2O3, and the total mass fraction of SiO2 and Al2O3 is 80-95%; the high-iron red mud is mixed with the high-aluminum coal ash in a set ratio after drying treatment, and is sent into a gasification furnace gasification area together with corn stalks through a conveying device. The application not only effectively improves the ash melting characteristics in the biomass gasification process, but also realizes the resource utilization of the red mud and industrial solid wastes such as coal ash, and has good engineering application value.

The utility model belongs to the boiler fuel recovery technical field, concretely relates to a coal ash and coal powder device of recovery boiler, include: casing, the partition plate is fixed in the inside of casing, and the inside of casing is divided into first cavity, second cavity and third cavity, material collecting part sets up in the outer wall of casing, and material collecting part extends to the inside of casing, and the extension is located in first cavity and second cavity respectively, the air draft part sets up in the outside of casing, the adjusting part sets up in the third cavity of casing, and input end is connected with the air draft part, and output end extends and communicates to first cavity and second cavity respectively. The utility model solves the energy waste problem caused by the coal powder being treated as garbage on one hand, solves the problem of causing harm to human body and wasting manpower and material resources by manual cleaning on the other hand.

The invention provides a cement clinker doped with barium slag and a preparation method and application thereof, and relates to the technical field of cement clinker preparation, the cement clinker is prepared from a main material and an admixture raw material component, the main material is composed of limestone, sandstone, clay, an iron material and barium slag, the admixture is composed of 3% of coal ash, and the admixture is composed of 1% of calcium carbonate. The main material comprises the following raw material components in percentage by weight: 79-83% of limestone, 0-3% of sandstone, 11-14% of clay, 1.9-2.4% of ferrous material and 1-7% of barium slag; according to the invention, barium slag is introduced as a modification component based on a traditional cement clinker formula system, so that multiple technical benefits can be realized at the same time: seed crystal doping, cement 28d strength improvement, orthorhombic system tricalcium aluminate content reduction, cement use performance improvement and the like, and the optimal barium slag doping amount is determined to be 5%; the prepared cement clinker and cement have the characteristics of high later strength, good use performance and the like.

The invention relates to a calcium-based adsorption material preparation method and a calcium-based adsorption material.The preparation method comprises the following steps that solid raw materials are obtained, and the solid raw materials comprise 75-95 wt% of a calcium-based precursor, 7.5-10 wt% of cement and 5-15 wt% of coal ash; crushing and grinding the solid raw material to form solid raw material powder; mixing the solid raw material powder to form mixed powder; a preset amount of deionized water is added into the mixed powder for mixing, so that the mixed powder is coagulated into lumps; calcium-based adsorption material particles are prepared from the agglomerates, so that the prepared calcium-based adsorption material can balance adsorption performance, mechanical strength and material cost, and is more suitable for large-scale CO2 capture.

The application discloses a coalbed gas gathering and filtering coal ash collecting device and relates to the technical field of coalbed gas filtering. The device comprises a cylindrical shell and a coal ash collecting box. The two ends of the shell are closed, an arc-shaped ash discharging port is arranged at the bottom of the shell, an air inlet and an air outlet are arranged on the closed structure of the two ends of the shell, a rotating filter frame is arranged in the inner cavity of the shell, a plurality of filter materials for filtering coal ash in the coalbed gas flowing through the inner cavity of the shell are arranged on the rotating filter frame, the rotating filter frame is driven by a motor arranged outside the shell, and the coal ash between the filter materials and the air inlet can be transported to the ash discharging port at the bottom of the shell under the rotation of the rotating filter frame. The coal ash collecting box is arranged below the ash discharging port and movably arranged on the outer ring sidewall of the shell. The rotating filter frame is used for switching the filter screen, and the functions of cleaning, disassembling, replacing, drying and collecting the filter screen are realized in the process of filtering the coalbed gas, so that the problem that the production needs to be stopped when the filter material is replaced in the prior art is solved.

An air leakage prevention device for a U-shaped water return pipe of a closed wall belongs to the technical field of mine closed wall devices, the U-shaped pipe comprises a vertical part and a bent part, the air leakage prevention device comprises a buoyancy ball movably arranged in the vertical part and a sealing cover arranged outside the U-shaped pipe and capable of blocking an opening of the U-shaped pipe, and a buoyancy rod fixedly connected with the buoyancy ball is arranged above the buoyancy ball. The inner wall of the vertical part is coaxially and fixedly connected with at least one guide ring, and the end, away from the buoyancy ball, of the buoyancy rod penetrates through the guide ring and is connected with the sealing cover. And the phenomenon of oxidation spontaneous combustion of coal ash caused by air entering a closed area from the U-shaped water return pipe is prevented.

This invention relates to a water gas preparation device based on dry quenching, comprising a recovery box; a storage box, the bottom of which is rotatably connected to the top of the recovery box; and a mixing mechanism, which includes a filter extrusion plate, a mounting component, a pushing component, a rotating component, and a mixing component. The mounting component is disposed on the recovery box and the storage box, the pushing component is disposed on the mounting component, and the rotating component is disposed on the storage box. By rotating and driving the motor, coal ash is evenly sprinkled into the pushing block. By adjusting the rotation of the motor, the filter extrusion plate is moved to compress the coal ash. By rotating and driving the motor, the pushing block is moved within the storage ring, pushing the compressed coal ash out of the storage ring for easy recovery of coal ash by the user. By rotating and driving the fixed motor, the fixed bevel gear drives the mixing rod to rotate, thereby causing the coal ash on the outer surface of the coal to fall off and rapidly heat the gas.

According to the open pit coal mine coal ash separation and conversion equipment provided by the invention, the equipment can synchronously realize classified screening of coal with different sizes through the three screen drums which are sequentially arranged and have gradually increased screen holes and are matched with the rotary rod and the screening assembly which are coaxially mounted, and meanwhile, by virtue of the screening assembly at the bottom of the material guide box and the reciprocating assembly linked with the rotary rod, the screening efficiency is improved. Coal ash vibration falling separation is synchronously completed in the coal screening process, the problems that in traditional equipment, the size screening process and the coal ash vibration falling process are independent, the occupied labor line is long, and the space utilization rate is low are effectively solved, the coal ash separation efficiency is improved, and the equipment complexity is reduced.

The invention relates to the technical field of building materials, in particular to a high-strength power plant slag-based unfired cementing material and a preparation method thereof.The preparation method comprises the following steps that S1, weighed power plant slag, pulverized fuel ash, slag, metakaolin and silica fume are subjected to co-grinding pretreatment; s2, adding the weighed sodium silicate and sodium hydroxide into water, stirring and dissolving to obtain an alkali activator solution; s3, putting the mixed powder obtained in the step S1 into a microwave reactor, and performing microwave irradiation activation; s4, stirring the mixed powder and an alkali activator solution to form slurry; s5, performing vacuum stirring on the slurry in the S4, injecting the slurry into a mold, performing vibration compaction, and then performing constant-temperature and constant-humidity sealed maintenance; and S6, after curing is finished, demolding is conducted, and a finished cementing material product is obtained. According to the invention, the power plant slag is used as a main material to prepare the high-strength unfired cementing material at normal temperature, so that high-valued utilization of solid wastes and low-carbon transformation of building material production are realized.