956 results about "Coal particle" patented technology

Relatively high speed methods for increasing the bulk density of coal particles without impacting the coal particles and an apparatus for compacting coal for making metallurgical coke. The method includes depositing coal particles onto a charging plate external to a coking oven. The charging plate has side walls, and at least one movable end wall to provide an elongate bed of dry, uncompacted coal having an upper surface on the charging plate. The uncompacted coal is compacted by passing a vibratory cylindrical compactor along a length of the uncompacted coal for a number of passes sufficient to decrease a thickness of the bed of coal to less than about 80 percent of an original thickness of the uncompacted coal. The vibratory cylindrical compactor has a length to diameter ratio ranging from about 1.4:1 to about 2:1.

A process for treating agglomerating coal includes providing dried, pulverized, agglomerating coal, and treating the coal in a vessel with a gas stream having an oxygen content sufficient to form at least some oxides on surface of coal particles, wherein the oxides are sufficient to convert coal into substantially non-agglomerating coal. The treated coal is transferred into a pyrolyzing chamber and passed into contact with an oxygen deficient sweep gas, the sweep gas being at a higher temperature than the temperature of the coal so that heat is supplied to the coal. The process further includes providing additional heat to coal indirectly by heating the chamber, wherein the heating of coal by the sweep gas and by the indirect heating from the chamber causes condensable volatile components to be released into the sweep gas. The sweep gas is removed from the chamber and treated to remove condensable components of coal.

A process for treating bituminous coal includes providing dried, pulverized coal, and treating the pulverized coal in a vessel with a gas stream having an oxygen content sufficient to form oxides on surface of coal particles. The treated coal is transferred into a pyrolyzing chamber and passed into contact with an oxygen deficient sweep gas, the sweep gas being at a higher temperature than the temperature of the coal so that heat is supplied to the coal. The process further includes providing additional heat to the coal indirectly by heating the chamber, wherein the heating of coal by the sweep gas and by the indirect heating from the chamber causes condensable volatile components to be released into the sweep gas. Some of the oxides are converted into paramagnetic mineral components, which are removed from coal to form a coal char having reduced ash and sulfur.

An ash agglomerating fluidized bed gasification method is provided. First, the coal powder is added in a gasification furnace; the gasification agent enters the bottom of the gasification furnace through a nozzle of a gas distributor, a central tube and a ring canal to make the coal powder gasified to produce gas under the fluidization state; the gas enters a first dust collector cyclone and a secondary dust collector cyclone after entering a first steam generator from the top of the gasification furnace, and enters a secondary steam generator to produce the saturated steam and enters a steam superheater and a boiler feed water preheater to continuously recycle the after heat of the gas, and then enters a final washing and cooling tower of the gas to further remove dust and reduce temperature and send to a follow-up system after dust removal via a deduster. The invention adopts the theory of fluidization to add the powder coal of the raw materials continuously in the dense phase of the gasification furnace. The gasification agent is blown in from the bottom of the gasification furnace to make the coal particle boiled and fluidized. The gas phase and solid phase are fully mixed and contact under the high temperature caused by combustion to carry out the thermolysis and the viscosity of the coal and the oxidation-reduction reaction of the carbon to realize the complete gasification of the coal finally.

The invention discloses a fully mechanized caving top coal caving three-dimensional simulation experiment platform and an experiment method. The platform and the method are used for researching the influences of elements in coal mine fully mechanized caving working face, such as mining-caving ratio, caving manner, caving technology, bracket tail beam inclination angle, coal caving port size, and broken top coal particle sizes, upon fully mechanized caving working face top coal recovery rate, and for verifying the influence of the spatial arrangement of an onsite top coal tracker upon onsite actual measurement precision of top coal recovery rate. According to the experiment platform provided by the invention, a mobile immediate roof is arranged, such that the influence of roof caving during an experiment process upon the recovery rate can be avoided. Coal pillars are preserved on the boundary, and only central-area recovery rate is counted, such that the influence of experiment method boundary conditions upon recovery rate statistics can be basically eliminated. Experimental-area residual coal amount can be obtained by using sheet metal inserts, such that top coal recovery rates under different conditions can be obtained. Therefore, guidance can be made for actual engineering, and an optimal fully mechanized caving scheme can be selected.

Coal fines are processed by flotation separation to separate coal particles from ash-forming component particles. Coal fines are mixed water under high shear mixing conditions to form an aqueous slurry of coal fines containing between 15 wt. % and 55 wt. % coal fines. The aqueous slurry is introduced into a coal flotation cell to separate coal particles from ash-forming component particles by flotation separation, wherein the coal fines have a particle size less than 500 μm, and more preferably less than 300 μm. Bubbles are generated in the coal flotation cell having a bubble size and bubble quantity selected to float the coal particles and to form a coal-froth containing at least 15 wt. % solid particles. The solid particles include coal particles and ash-forming component particles. The coal-froth is collected for further processing.

The invention relates to an intelligent monitoring system for monitoring a coal conveying belt of a coal conveying system, comprising a coal particle identification module, a belt sinkage detecting module, a horizontal belt displacement detecting module, a belt conveyor vibration detecting module and a controller, wherein the controller is connected with all the modules in a wired or wireless manner; the coal particle identification module is used for monitoring whether large coal blocks exist on the coal conveying belt by firstly detecting whether coal cutoff occurs and then utilizing a particle image identification technology; the belt sinkage detecting module is used for monitoring whether large coal blocks exist on the coal conveying belt by judging the sinking degree of the belt; the horizontal belt displacement detecting module is used for monitoring whether the coal conveying belt deviates or is torn; the belt conveyor vibration detecting module is used for monitoring whether the coal conveying belt is impacted by the large coal blocks or generates friction with the large coal blocks by detecting the vibrating frequency of a belt conveyor; and the controller sends a braking instruction after receiving an instruction needing to brake the belt conveyor so as to brake the belt conveyor.

A pneumatic particle size classifying device for solid particles comprises a fluidized bed main body, a cyclone separator, material inlets, an air distributing system, a secondary air port, a coarse material outlet and a fine material collecting and discharging system. The material inlets are positioned on the middle upper portion of the fluidized bed main body and are distributed on four walls in a multi-point manner, the hopper-shaped air distributing system consists of an inclined air distributing plate, the coarse material outlet is arranged in the center of the inclined air distributing plate, the fine material collecting and discharging system consists of a fine material collecting chamber and an intermittent discharging valve and is directly connected with a lower particle outlet of the cyclone separator, or the fine material collecting and discharging system can consist of a fine material collecting chamber and a fine material discharge port and is connected with a particle outlet of a feedback valve. The pneumatic particle size classifying device is simple in structure, effective pneumatic particle size classification for selective coking coal particles is carried out by fluidization technology, retaining time of the particles in the bed body can be effectively prolonged, the pneumatic particle size classifying device is stable in running and fine in separation effect, and energy and coking coal resources are greatly saved.

A process and apparatus for coal pyrolysis pretreatment. The apparatus is made up of a pretreatment vessel for holding a bed of coal particles, a preheater for heating the bed of coal particles to a temperature below the coal pyrolysis temperature range and an oxygen remover for removing oxygen released from the heated coal particles. The apparatus can also have a flue gas source as an oxygen removal sweep gas to the bed of coal, a collector for collecting non-condensable combustible gases, and the preheater having a furnace holding ceramic balls which are circulated from the furnace to the bed of coal particles. The process involves heating the bed of coal particles to a temperature below the coal pyrolysis temperature range and preventing air from contacting the bed of coal particles in addition to collecting non-condensable combustible gases or the preheating step accomplished by having a furnace holding ceramic balls which are circulated from the furnace to the bed of coal particles.

The invention relates to a digital holographic technique, and aims to provide a pipeline powdered coal particle size measuring device and a measuring method. The method comprises the following steps: sampling a gas in a powdered coal conveying pipeline by a sampling nozzle, mixing clean air with the sampled gas to form a mixed gas, and taking the mixed gas as a sample to be delivered into a diluting chamber; combining a laser with a spatial filter to generate collimated laser, and projecting the collimated laser to a CCD camera by virtue of a laser channel of the diluting chamber; and processing a holographic image acquired by the CCD camera to obtain concentration and particle size distribution information of the measured sample, and then obtaining concentration and particle size distribution data of the powdered coal in the sampled gas according to a dilution ratio of the measured sample. By use of the device and the method provided by the invention, online quantitative measurement on the particle size and the concentration of the powdered coal in a pipeline can be achieved at the same time. The device is easy to operate and has a relatively high automation degree, and the measurement process does not need artificial interference; and by virtue of computer calculation, a measurement result close to reality can be given, manpower and material resources are saved, and daily running monitoring and maintenance work of coal-fired boiler equipment are facilitated.

The invention provides a device and method for preparing an activated carbon material for an electrochemical capacitor, belonging to the technical fields of coal chemical industry and microwave chemistry. The method comprises the following preparation processes of: deashing coal particles serving as raw materials by using hydrochloric acid and hydrofluoric acid, modifying the deashed coal by using nitric acid in an auxiliary way, mixing the modified coal serving as a carbon source with potassium hydroxide and deionized water, stirring to obtain a mixture, stirring and evaporating the mixture to obtain a solid mixture, and then performing microwave-assisted activating, washing, drying and grinding on the solid mixture to obtain the activated carbon. The invention has the advantages that the activation time is only 20-30 minutes, the mass ratio of potassium hydroxide to coal is (0.5-3):1, the preparation process is simple, the microwave-assisted heating is uniform, efficient and energy-saving, the consumption of the potassium hydroxide is reduced, and the activation process has the advantages of uniformity and high efficiency. The prepared activated carbon is used as an electrode material of the electrochemical capacitor and has better stability and excellent comprehensive property.

In a method to decrease emission of mercury, a factor is selected to control a combustion process to generate a flue gas comprising fly ash with enhanced unburned carbon; the combustion process is controlled according to a factor selected from reburning fuel, flue gas temperature, OFA injection, coal particle size, LNB flow, LNB design, combustion zone air, stoichiometric ratio of fuel, fuel/air mixing in a primary combustion zone and fuel/air mixing in a secondary combustion zone to produce the flue gas comprising fly ash with enhanced unburned carbon and to vaporize mercury; and the flue gas is allowed to cool to collect fly ash with enhanced unburned carbon with absorbed mercury. A system to decrease emission of mercury; comprises a combustion zone that is controlled to generate a flue gas comprising fly ash with enhanced unburned carbon and that produces vaporized mercury; and a post combustion zone to cool the flue gas to collect fly ash with enhanced unburned carbon with absorbed mercury.

A wall-mount horizontal bias direct-flow combustion device relates to a horizontal bias direct-flow combustion device. The invention solves the problems of the prior direct-flow combustor, such as four-corner tangential arrangement, different air supply conditions of coal flows on two sides, high risk of slag deposition due to declination and corrosion at high temperature. First dense/dilute air jet ports and a second air jet port (3) are formed on the water-cooled wall (6) of a furnace cavity (5) and combined to form a group of combustors (7). The central line (31) of the second air jet port and the central line (21) of the first dilute air jet port (2) are positioned in the fire-facing side direction, and have the included angles of alpha 1 and alpha 2 with relative to the water-cooled wall (6), on which the jet ports are positioned. The included angle between the central line (11) of the first dense air jet port and the central line (21) of the first dilute air jet port (2) is alpha 3. After-burn air jet ports (4) are arranged on the water-cooled wall (6) or at each corner of the furnace cavity (5). The After-burn air jet ports (4) are positioned above the combustors (7). The wall-mount horizontal bias direct-flow combustion device realizes reasonable combination of coal particles and air, prevents the deflection of coal flow, and ensures stable combustion, low load and low NOx discharge of boilers.

The invention discloses a preparation method of stable ashless nano coal slurry. The method includes: (1) preparing ultra-fine organic coal slurry by ball milling after the coal is swollen in an organic solvent; (2) removing the ash in the coal by organic solvent extraction; (3) removing the ash-free coal from the The organic solution is separated, and the structure control agent is used to control the growth process of coal molecules to form nano-coal particles with adjustable particle size. Finally, a stable ashless nano-coal slurry is prepared by adding a dispersion stabilizer. The dispersion medium can be water, alcohol , oil or a mixture of solvents. This method uses solvent extraction-precipitation method to prepare coal-based liquid fuel. Compared with traditional coal direct liquefaction and indirect liquefaction, it has the advantages of simple process, high energy utilization rate and low cost. The prepared coal slurry can be directly used in diesel engines, Gas turbines, central air-conditioning, oil-fired boilers, etc. are used to replace fuel oil and vaporize to prepare oxygen.

The invention discloses a grain(powder)-shaped coal-based fuel and the process for preparation, the coal-based fuel is prepared through adopting a wet fine grinding-dry rough grinding technique, namely the process for preparation comprises the following steps: mixing raw material coal and liquid whose mass ratio is (7-8):(2-3), and preparing into slurries with slurries through wet fine grinding, wherein the dosage of dispersing agent is 0.3-3% of the amount of dry coal in raw material coal, and the concentration of slurries is 70%-80%, coal particle content which is less than 74um in slurries is bigger than 90%, utilizing dry rough grinding to grind raw material coal and dispersing agent into dry coal powder, wherein dispersing agent is 0.3-3% of dry coal amount in raw material coal, coal particle content which is less than 74um in dry coal power is less than 50%, stirring the above slurries and the above dry coal powder according to 100:(30-80), controlling coal particles stacking efficiency in 60%-80%, shaping grain(powder)-shaped coal-based fuel, wherein maximum particle grain size is 300um, the content of coal particles which are less than 74um are bigger than 75%, and the content of coal is bigger 80%.

The invention provides an integrated process for drying forming of low-rank coal. The process comprises the following steps: (1) crushing the low-rank coal to be dried so that the particle size of the crushed low-rank coal particles is less than 50 millimeters; (2) delivering the crushed low-rank coal into a roller dryer quantitatively; (3) rotating the roller dryer and introducing heating fluid to the roller dryer to heat the coal in a roller; (4) collecting the coal discharged from the roller dryer, and delivering the heating fluid, dust carried along with the heating fluid, and water vapor from the low-rank coal into a dust processing system; (5) classifying the low-rank coal collected from the roller dryer according to certain particle size, and delivering the low-rank coal with the particle size of larger than the certain particle size to a product warehouse as a first product; and (6) delivering the low-rank coal with the particle size of smaller than the certain particle size to an extrusion forming device through a sealed delivery device to be extruded and formed together with the coal dust collected from the dust processing system, and delivering the formed product to the product warehouse as a second product.

The invention relates to a method for monitoring a coal conveying belt of a coal conveying system by an intelligent monitoring system. The intelligent monitoring system comprises a coal particles identifying module, a belt sinkage detecting module, a belt lateral displacement detecting module, a belt conveyor vibration detecting module and a controller, wherein the controller is connected with each module in a wired way or in a wireless way. The method comprises the following steps of: monitoring whether large-sized coal is existed on the coal conveying belt by the coal particles identifying module; monitoring whether the large-sized coal is existed on the coal conveying belt by the belt sinkage detecting module; monitoring the status of the coal conveying belt by the belt lateral displacement detecting module; monitoring the belt conveyor vibration condition of belt conveyor caused by the vibration of the coal conveying belt throughby the belt conveyor vibration detecting module; and braking athe belt conveyor by the controller, wherein the controller receives the instruction that the belt conveyor needs to be braked and sends out the braking instruction, so that the belt conveyor is braked.

The invention relates to a dry pulverized coal cyclone entrained flow bed gasification furnace and a gasification method thereof, which belong to the technical field of coal gasification device. The dry coal dust cyclone entrained flow bed gasification furnace comprises a top nozzle, a furnace roof, a gasification chamber, an exhaust port and a bottom slag discharge port. The top nozzle is an annular channel structure with inner, outer swirl vanes, at least one layer of a tangential O2 nozzle is arranged on the lateral wall of the gasification chamber. Pulverized coal gas flow and vapor are fed through a top nozzle in a whirling way, and the pulverized coal gas flow rotating downwards is formed in the near-wall area. The pulverized coal particles are subjected to film type gasification on a liquid slag film formed on the surface of the furnace wall under the centrifugal action of the high-speed rotation gas flow. The service life of the nozzle is effectively prolonged, the residing time of the pulverized coal in the furnace is increased, and the carbon conversion efficiency is increased; liquid slags reside on the wall surface, so as to effectively protect the wall surface; the multiple layers of the tangential O2 nozzles are arranged to effectively disperse heat load and the work reliability of the gasification furnace is increased.

Fine coal particles are dewatered by mechanically removing water from the coal particles by vibration assisted vacuum dewatering to form a coal particle filter cake. The filter cake typically has a water content less than 35% by weight, suitable for extrusion to form discrete, non-tacky pellets. The vibration assisted vacuum dewatering may operate at a vibration frequency in the range from about 1 Hz to about 500 Hz. The vibration frequency may be adjusted during the dewatering process. In some embodiments, the vibration frequency is increased as the moisture content of the coal particle filter cake is decreased. Washing the filter cake during dewatering removes soluble contaminants. Various vibration assisted vacuum dewatering devices may be used, including a vibration assisted rotary vacuum dewatering drum, a vibration assisted vacuum disk filter, and a vibration assisted vacuum conveyor system.