96 results about "Bituminous coal" patented technology

The invention relates to a method for preparing a hard carbon material from carbon dot heterogeneous cross-linked bituminous coal, a coal-based hard carbon material and application. The preparation method comprises the following steps: (1) soaking pretreated bituminous coal in an acid solution, washing to be neutral, and drying to obtain dry pulverized coal; (2) dispersing the carbon dots in an alcohol solvent for ultrasonic treatment to obtain a dispersion liquid; (3) mixing the dried pulverized coal obtained in the step (1) and the dispersion liquid obtained in the step (2), mechanically stirring, and drying to obtain a mixture; (4) performing low-temperature heating crosslinking on the mixture obtained in the step (3) in an oxygen-containing atmosphere so as to obtain a heterogeneous crosslinking product; and (5) performing high-temperature carbonization on the heterogeneous cross-linked product in an inert atmosphere to obtain the coal-based hard carbon material. The coal-based hard carbon material can be used as a sodium ion battery / potassium ion battery negative electrode, and has excellent sodium / potassium storage performance.

The invention provides a bituminous coal caking index full-process detection system based on a mechanical arm and a use method thereof, which can realize the operation of the whole bituminous coal caking index detection process from blanking weighing to crucible testing and then cleaning and recycling through the mechanical arm, and can liberate laboratory technicians from a tedious, monotonous and harmful working environment. And intelligent, unmanned, specialized, technical and standardized caking index detection and inspection service is realized. The system comprises a blanking weighing module used for placing quantitative samples into a crucible; the bonding pre-treatment and post-treatment module is used for treating samples before and after coking; the high-temperature furnace module is used for performing high-temperature coking treatment on the sample; the mechanical arm is used for clamping a crucible or a crucible holder and circulating among the blanking weighing module, the bonding pretreatment and aftertreatment module, the high-temperature furnace module, the bonding rotary drum tester module, the cooling module and the cleaning module.

The invention relates to a sample micro-weighing device and method for bituminous coal caking index measurement and industrial analysis. The sample micro-weighing device comprises a horizontal guide rail, a vertical guide rail, a cantilever support, a standard sample micro-weighing device, a to-be-measured sample micro-weighing device, an analytical balance, a sample bottle, a crucible and a control system. The vertical guide rail can move along the horizontal guide rail, and the to-be-measured sample micro-weighing device is movably connected with the vertical guide rail through a rotating device; and the standard sample micro-weighing device is movably connected with the vertical guide rail through a cantilever bracket. The device and the method are mainly used for measuring the caking index of bituminous coal according to a GB / T 5447 Bituminous Coal Bituminous Index Measurement Method and carrying out coal sample industrial analysis according to a GB / T 212 Air Dried Coal Sample Ash Measurement, can realize trace weighing of the sample, can realize weighing of the whole sample, can execute uniform mixing operation before weighing, and can be used for measuring the caking index of the bituminous coal according to the GB / T 5447 Bituminous Coal Bituminous Index Measurement Method. And the problem of sample segregation easily caused by conventional weighing and sampling is effectively avoided.

This invention relates to the field of coking coal blending control technology, and discloses a method for controlling the coking stabilization of bituminous coal and coking coal blends, comprising the following steps: obtaining the thermoplastic parameters, petrographic parameters, and moisture parameters of bituminous coal and coking coal in the current control batch; establishing a dual-coal plasticity synergistic stabilization window based on the thermoplastic parameters and petrographic parameters, and determining the target dry basis blending ratio within the dual-coal plasticity synergistic stabilization window; converting the target dry basis blending ratio into the actual wet basis feed rate based on the moisture parameter; obtaining the actual particle size distribution after crushing, and adjusting the crushing parameters and feed compensation correction when there is a particle size deviation; blending according to the corrected actual wet basis feed rate, and obtaining the thermoplastic verification parameters of the blended coal; when the blended coal deviates from the target verification range, identifying the cause of deviation as moisture deviation, particle size deviation, or coal quality deviation according to a preset order, and performing corresponding corrections.

The invention relates to the technical field of sodium ion battery negative electrode materials, in particular to a hard carbon negative electrode material as well as a preparation method and application of the hard carbon negative electrode material. And the compaction density, the first efficiency and the capacity of the hard carbon negative electrode material are obviously improved. In addition, the technological process is simple, the usage amount of highly corrosive reagents (such as HF and NaOH) is reduced, low-rank coal (such as lignite and bituminous coal) can be compatible, and the raw material cost is reduced.

The invention discloses a microemulsion collecting agent applying jatropha curcas oil to low-rank coal flotation and preparation and application of the microemulsion collecting agent, and belongs to the technical field of low-rank coal flotation, the microemulsion collecting agent is composed of jatropha curcas oil biodiesel, a surfactant, a cosurfactant and water, and the preparation method of the microemulsion collecting agent comprises the steps that 1, crude jatropha curcas oil and methyl alcohol are subjected to transesterification in the presence of a basic catalyst, the jatropha curcas oil biodiesel is obtained; (2) dissolving a surfactant in water to prepare a solution; (3) mixing the jatropha curcas oil biodiesel with a surfactant solution, adding a cosurfactant, and stirring at room temperature to form a microemulsion; and (4) the microemulsion is filtered, and the microemulsion collecting agent is obtained. The collecting agent solves the problems that a low-order bituminous coal flotation collecting agent is low in selectivity, poor in collecting performance, large in agent dosage, low in clean coal yield and high in ash content, and has good industrial application and popularization prospects.

The invention relates to the technical field of thermal power generation, and discloses an integrated system and method for a middle storage type hot air pulverized coal feeding meagre coal boiler, in the system, the output end of a bituminous coal pulverizing unit and the output end of a meagre coal pulverizing unit are correspondingly connected with the input end of a bituminous coal pulverized coal feeder and the input end of a meagre coal pulverized coal feeder respectively; the output ends of the bituminous coal powder feeder and the meagre coal powder feeder are respectively connected to the hearth; the bituminous coal powder feeder and the meagre coal powder feeder are respectively provided with a temperature control pipeline, one end of the air temperature control system is connected to the bituminous coal powder feeder through the temperature control pipeline, and the other end of the air temperature control system is connected to the meagre coal powder feeder through the temperature control pipeline. The air temperature control system is connected with the bituminous coal pulverized coal feeder and the meagre coal pulverized coal feeder through the temperature control pipeline, the temperature of hot air fed into the hearth can be accurately controlled according to different coal types and operation working conditions, the appropriate hot air temperature is beneficial to safe and stable ignition and combustion of pulverized coal of different coal qualities, the combustion process is optimized, the combustion efficiency is improved, and the energy consumption is reduced. And incomplete combustion loss is reduced.

The invention discloses coal water slurry prepared from epoxy resin wastewater and a preparation method and application of the coal water slurry, and the coal water slurry comprises the following components in parts by weight: 225-600 parts of mixed coal; 150 to 400 parts of epoxy resin wastewater; 0.1 to 10 parts of an additive; the mixed coal is composed of bituminous coal and anthracite, and the weight ratio of the bituminous coal to the anthracite is (1-5): (1-5). The epoxy resin wastewater is used for replacing fresh water, anthracite and bituminous coal are mixed, the prepared coal water slurry has no corrosion to a rod mill and is good in slurrying property and high in ash fusion point, the water-cooled wall gasification furnace is used for gasifying the coal water slurry, the gasification reaction temperature is high, oxygen consumption is low, the carbon conversion rate is high, the COD content of external gasification sewage of the gasification furnace and the sewage discharge amount are low, and the coal water slurry can be recycled. The method has the advantages of realization of the resource utilization of the epoxy resin wastewater, improvement of the adaptive capacity of coal types, no environmental pollution, environmental protection, and generation of important economic values and social benefits.

The invention relates to the technical field of metallurgical engineering, and discloses a mixed coal injection, coal gun and blowpipe improvement process, which comprises the following steps: S1, designing and optimizing a coal blending structure, selecting high-volatility bituminous coal and low-volatility coal to mix and inject pulverized coal, dynamically adjusting the proportion according to the coal quality characteristics, and controlling the volatile component range of the pulverized coal to be 20-25%; s2, process parameters are adjusted, the temperature range of gas entering a mill is 260-280 DEG C, in the step S1, the initial proportion is 40%-50% of high-volatility bituminous coal and 50%-60% of low-volatility coal, and the proportion of the low-volatility coal is adjusted to 35%-40% in stages. By optimizing the coal blending structure, flexibly adjusting the proportion of the high-volatility bituminous coal to the semi-coke powder and controlling process parameters, the combustion efficiency and the injection amount of the pulverized coal are effectively improved, it is ensured that the pulverized coal can be combusted and utilized more sufficiently in the injection process, and the production efficiency is substantially improved.

The invention relates to the technical field of bituminous coal carbon content prediction, and discloses a bituminous coal coal quality industrial analysis-based unit calorific value carbon content prediction method, which comprises the following steps of 1, sampling a target coal type for industrial analysis, and detecting the total moisture Mt, the ash content Aar, the volatile component Var and the fixed carbon FCar content of the target coal type; measuring the calorific value of the sampled coal to obtain the lower calorific value Qnet, ar of the coal type; step 2, calculating a dry ash-free basis volatile component Vdaf and a lower calorific value Qnet, daf of the target coal type; 3, predicting the carbon content CQdaf of the dry ash-free basis unit calorific value of the target coal type; and step 4, calculating the unit calorific value carbon content CQar of the target coal type. According to the method, the unit calorific value carbon content of the bituminous coal can be accurately predicted, and coal purchase is guided; the coal carbon content is further calculated by using the unit calorific value carbon content calculated by the method, the prediction precision is very high, and the correlation coefficient can reach 1-10-10.

The present application relates to coal physicochemical detection technical field, especially to a kind of sample particle size correction method for bituminous coal caking index, including preparation n samples, in n samples, the proportion of each sample particle size 0.1mm~0.2mm coal sample is respectively marked as X1, X2, X3……X n , n samples are tested, the caking index of each sample is determined, the caking index of the sample is calculated, the linear equation=aX+b of n samples is established, the caking index of any proportion X between the high and low points X1~Xn of the linear relationship is calculated, and the caking index under the X proportion is taken as the final result; the present application can effectively eliminate the influence of the change of the proportion of coal sample with particle size of 0.1mm~0.2mm on the determination of caking index, effectively eliminate the measurement error of laboratory internal and interlaboratory, improve the precision and accuracy of bituminous coal caking index determination method.

The application provides a method for directly reducing vanadium-titanium magnetite in a gas-based shaft furnace, and belongs to the technical field of metallurgical processes. The method comprises the following steps: mixing: uniformly mixing 10-15 parts by weight of pulverized bituminous coal, 80-85 parts by weight of iron vanadium-titanium magnetite powder, 5-10 parts by weight of a high-temperature accelerator and 8-12 parts by weight of hot water to obtain mixed materials; balling: balling the mixed materials to obtain briquettes, which do not need to be heated, dried or roasted; and reducing: directly reducing the briquettes in a gas-based shaft furnace to obtain finished vanadium-titanium DRI. The application uses 100% vanadium-titanium ore, adopts non-blast furnace technology and a gas-based shaft furnace direct reduction process, the carbon in the prepared bituminous coal and the hot water are subjected to a gasification reaction at high temperature to generate CO and H2 required by the reduced iron, the amount of reducing gas used is reduced, and the technical problem of unstable supply of reduced coke in the prior art for deeply reducing vanadium-titanium magnetite is fundamentally solved.

This invention relates to the field of power engineering control technology, and in particular to an intelligent coal blending system and method. It includes: a coal type identification unit for identifying the type of coal supplied to the coal mill; wherein the supplied coal types include lignite, bituminous coal, and anthracite; a unit calculation unit for real-time acquisition of the calorific value K and sulfur content I of the coal; and an intelligent blending unit for real-time adjustment and control of the amount of bituminous coal in the coal mill's supplied coal types based on the calorific value K and the sulfur content I. This invention, through intelligent, automated, and real-time adjustment and control of the amount of bituminous coal in the blended coal, and by using the calorific value and sulfur content as parameters for adaptive correction, effectively improves the complete combustion of coal to achieve the required energy supply and reduces pollution generated by coal combustion.

The invention relates to a method for judging the proportioning accuracy of a coal blending process, which belongs to the technical field of blast furnace ironmaking, and comprises the following steps: sampling bituminous coal and anthracite delivered from a stockpiling site at multiple points every day, and testing the components as a first analysis sample and a second analysis sample; carrying out normality test on the first analysis sample and the second analysis sample to obtain a test result; when the first analysis sample or the second analysis sample is in non-normal distribution, determining that the quality of the bituminous coal or the anthracite fluctuates severely or has a phenomenon of warehousing and ex-warehouse mixing; performing multi-point sampling on the raw coal entering the coal mill every day, and testing components as a third analysis sample; and carrying out normality test on the third analysis sample, and when the third analysis sample is in non-normal distribution, determining that an obvious proportion fluctuation or single coal mixing phenomenon exists in the period of time. According to the method, the analysis sample is subjected to normality test, so that the matching accuracy of the coal blending process can be effectively verified, and effective early warning on the matching abnormal condition of the coal blending process is realized.

This invention belongs to the technical field of blast furnace pulverized coal injection equipment, particularly the safety injection component for high-volatile bituminous coal and the blast furnace pulverized coal injection equipment and its usage method. Addressing the problems of low combustion rate, substandard pulverized coal particle size, and susceptibility to moisture absorption during pulverized coal storage, this component features an insulation sleeve on the outer wall of the injection pipe, preheating the pulverized coal with blast furnace exhaust gas to reduce heating energy consumption and promote rapid ignition. A spiral plate inside the injection pipe enhances the mixing of pulverized coal and nitrogen, and an electric push rod at the top controls a bending plate to adjust the pulverized coal injection angle, strengthening airflow disturbance and increasing the contact area between pulverized coal and oxygen. The blast furnace pulverized coal injection equipment includes a grinding cylinder and a storage box. The grinding cylinder has a multi-stage grinding structure, with a rotating shaft driving a grinding wheel to perform primary and secondary grinding of the pulverized coal, ensuring uniform particle size. The storage box utilizes exhaust gas heat to dry the pulverized coal and suppress spontaneous combustion. By optimizing the preheating, grinding, injection, and storage processes, the equipment improves the pulverized coal combustion rate and utilization rate, ensuring production safety.

This invention relates to the field of coal dry distillation and coking technology, and particularly to a method for determining the coking capacity of coal based on plastic mass characteristic parameters. The method includes steps S1: collecting a coal sample and heating it at a first heating rate; step S2: heating the coal sample at a second heating rate while the current dry distillation process is in the second stage; step S3: in the second stage, analyzing the synchronicity between the maximum plastic mass thickness and the maximum volatile matter release rate, and determining whether to reduce the second heating rate based on the analysis results and the expansion coefficient; step S4: in the third stage, calculating the coking capacity coefficient based on the amount of plastic mass generated, the softening temperature range, and the maximum plasticity value. This invention intelligently monitors the dry distillation process of bituminous coal, combines actual data for feedback adjustments, and further optimizes the coking process. By considering the synchronicity between the maximum plastic mass thickness and the maximum volatile matter release rate, the heating rate is optimized to achieve a stable improvement in coke quality.

The present application belongs to the technical field of flue gas treatment, and specifically provides a preparation method of non-tar active coke, comprising the following steps: (1) adding phenolic resin powder, carboxymethyl cellulose powder and short glass fiber into pitch in a stirring state to obtain a mixture; (2) mixing bituminous coal and active coke grinding waste coke powder to obtain coal powder; (3) putting the coal powder into a kneader and starting stirring, adding the mixture into the kneader, then adding a Tween aqueous solution, and performing kneading to obtain a kneaded material; (4) granulating and drying the kneaded material, and then performing carbonization and activation to obtain the non-tar active coke. The preparation method uses waste coke under the vibrating screen of the regeneration tower of a desulfurization and denitrification system as the main raw material, and replaces part of the coal to reduce the preparation cost of the active coke. And a step-by-step mixing method is adopted, and a series of high molecular organic materials with different functions are matched to replace tar and improve the environmental friendliness of the preparation process.

The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a method for preventing a cold pressing block from bursting and bonding in the carbonization process. The method comprises the following steps: mixing iron ore powder, bituminous coal, anthracite and an adhesive in proportion, heating, and carrying out cold press molding to prepare a cold press block; the method comprises the following steps: spraying a composite anti-sticking agent solution mainly comprising desulfurized gypsum and lignin on the surface of a cold-pressed block, sequentially heating in a nitrogen atmosphere, and carrying out multi-stage carbonization treatment to finally obtain a composite iron coke product. By optimizing the heating system and innovatively adopting the desulfurized gypsum-based composite anti-sticking agent, the problems of cracking and bonding of the cold-pressed block in the carbonization process are remarkably inhibited, the yield, the mechanical strength and the process efficiency are greatly improved, high-value utilization of industrial solid wastes is realized, and the method has the advantages that the raw materials are easy to obtain, the method is green and environment-friendly, the process is simple and convenient, and the like. And the practical application requirements of blast furnace ironmaking production are met.

The utility model relates to the technical field of cement firing, in particular to a cement kiln capable of realizing mixed combustion of waste tire powder and low-heating-value bituminous coal, which comprises a base, a cement kiln main body is mounted on the left side of the top of the base, the top of the cement kiln main body is communicated with a smoke exhaust pipe, and the top of the smoke exhaust pipe is communicated with a smoke guide pipe. And a dust removal assembly is arranged in an inner cavity of the smoke guide pipe. According to the base, cement is fired through mixed combustion of waste tire powder and low-heating-value bituminous coal, waste gas generated in the firing process flows into the smoke guide pipe through the smoke exhaust pipe, the waste gas is introduced into the filter shell through the smoke guide pipe, impurities in the waste gas are filtered out through the filter plate, and the filtered impurities fall into the storage box to be collected under the action of gravity; after long-time use, much dust is attached to the inner wall of the smoke guide pipe, and a transmission shaft of a motor drives a rotating rod, a first belt pulley, a second belt pulley and a driving belt to rotate.

The invention relates to an injection coal proportioning and utilization technology in the field of blast furnace ironmaking, and discloses injection coal and a coal blending method thereof. According to the method, the fixed carbon mass fraction of mixed pulverized coal is not lower than 74%, the sulfur mass fraction is not higher than 0.75%, and the dry basis high calorific value is not lower than 7600 kcal / kg as control indexes, high-sulfur injection coal, large bituminous coal and high-carbon fly ash are selected to prepare the pulverized coal, and matching is conducted within the range that the high-carbon fly ash mass fraction ranges from 1% to 2%, and the large bituminous coal mass fraction ranges from 11% to 18%. And the carbon content and the fineness of the high-carbon fly ash are controlled, so that the obtained mixed pulverized coal meets the requirements of blast furnace injection granularity and components. Compared with the prior art, the method has the advantages that the pulverized coal injection cost is reduced on the premise of ensuring smooth operation of the blast furnace and stable sulfur content of the molten iron, and stable resource utilization of the high-carbon fly ash is realized.

The present application relates to a kind of vacuum roasting coupling microbial upgrading no-bonding high-sulfur bituminous coal preparation silicon smelting reducing agent method, belong to industrial silicon smelting composite reducing agent technical field.The present application mixes even with bituminous coal powder and corn cob powder and obtains mixture A, hydrogen peroxide solution is added in mixture A and grinds and mixes evenly and obtains mixture B;Mixture B is placed in temperature 800~1200 ℃ under vacuum roasting 30~90min, with furnace cooling and obtains roasting mixture C;Deionized water, bacteria liquid and sodium silicate are added to roasting mixture C, and carry out microbial leaching at temperature 25~65 ℃ for 5~10h, and stratify after standing, remove supernatant;Repeat microbial leaching step until supernatant is neutral, solid-liquid separation, and solid drying obtains low-sulfur composite reducing agent.The low-sulfur composite reducing agent obtained by the present application reaches 91.2~93.7%, and the caking index is 28~53, and the reaction activation energy is 13.4~17.7KJ / mol, meet the requirements of industrial silicon composite reducing agent.

This application provides a method for preparing new blast furnace charge using sintered return ore, belonging to the field of iron and steel metallurgical technology. The method includes pre-treating sintered return ore, pulverized coal, and a binder by crushing, screening, and drying; wherein the pulverized coal includes bituminous coal and coke powder; uniformly mixing the pre-treated sintered return ore, bituminous coal, coke powder, and binder to obtain a mixture; heating and cold-pressing the mixture to prepare a cold-pressed billet; and carbonizing and cooling the cold-pressed billet to prepare a sintered return ore composite iron coke product. This method effectively solves the problem of inefficient and low-carbon utilization of sintered return ore. Furthermore, using sintered return ore to replace iron concentrate in the preparation of composite iron coke significantly reduces production costs while ensuring high reactivity, achieving a low-cost transformation.

The invention discloses a feeding device based on roadway coal mining, and relates to the technical field of roadway coal mine conveying, the feeding device comprises a feeding machine body, two protection plates are fixedly connected to the feeding machine body, a feeding hopper is fixedly connected between the two protection plates, and a protection mechanism is arranged above the feeding machine body; the protection mechanism is used for pushing materials to get close to the center of the feeding machine body conveying belt and comprises a material pushing plate slidably connected to one side of the protection plate. Through arrangement of the protection mechanism and cooperation of a material pushing plate, a supporting plate and a material blowing nozzle, the situation that crushed materials generated during material conveying are close to the edge of a conveying belt of the feeding machine body is effectively avoided, meanwhile, friction force generated during crushed material moving is effectively prevented, and the stability of the feeding machine body during conveying of soft coal with the medium coalification degree is guaranteed; the two kinds of particles can obtain matched driving energy, the friction force between the two kinds of particles and the feeding machine body is reduced, and meanwhile raising and diffusion of flying dust are limited to a certain degree in the pushing process.

The invention discloses a method for predicting unit calorific value carbon content based on coal quality industrial analysis data. The method comprises the following steps: 1, acquiring multi-database coal type industrial analysis data, element analysis data and calorific value; 2, calculating dry ash-free basis volatile components, hydrogen elements, carbon elements, sulfur elements and lower calorific values of the database coal types; step 3, calculating a carbon hydrogen ratio and a unit calorific value carbon content of a dry ash-free base of the coal type in the database; step 4, through linear fitting, respectively obtaining a function relationship between a volatile component, a sulfur content, a calorific value and a carbon content per unit calorific value of the coal type drying ash-free basis in the database; 5, a new parameter A0 is obtained, and the new parameter and the unit calorific value carbon content are subjected to linear fitting; 6, sampling the target coal for industrial analysis, and detecting the calorific value and the sulfur content of the target coal at the same time; step 7, calculating dry ash-free basis volatile sulfur content, lower calorific value and parameter A0 of the target coal type; 8, predicting the dry ash-free basis unit calorific value carbon content of the target coal type; step 9, calculating the unit calorific value carbon content of the target coal type; the method can accurately predict the unit calorific value carbon content of the bituminous coal, and guides the coal purchase.

The present invention discloses an application of structural coal in the preparation of coal-based graphite, belonging to the field of structural coal application technology. It overcomes the technical prejudice in the prior art that various levels of bituminous coal have always been considered as non-graphitizable carbon. The application of structural coal in the preparation of coal-based graphite of the present invention is to first crush the structural coal, then grind and screen the obtained structural coal particles, and then deash the obtained structural coal powder. Finally, under vacuum conditions, the deashed structural coal powder is graphitized to obtain coal-based graphite, wherein the coal body structure type of the structural coal meets: any one or more of granular structural coal and mylonitic structural coal; the microscopic deformation degree of the structural coal meets: any one or more of brittle-ductile transition deformation and ductile deformation. The present invention realizes the direct graphitization of bituminous coal, which is considered as non-graphitizable carbon, without adding a catalyst, and expands the carbonaceous source and preparation method of coal-based graphite materials.

The invention discloses a primary air powder pipeline segmented electromagnetic heating system for deep peak regulation of an anthracite unit, which comprises an air pipe main body, the air pipe main body comprises an inner pipe and an outer pipe, the outer pipe is sleeved outside the inner pipe, and an interlayer is arranged between the inner pipe and the outer pipe; the electromagnetic heating system comprises a first electromagnetic coil and a second electromagnetic coil; the first electromagnetic coil and the second electromagnetic coil are both connected with the electric control system, and the electric control system is used for controlling the first electromagnetic coil and the second electromagnetic coil to be powered on alternately; the temperature monitoring system is mounted in the inner pipe; the terminal control system is used for integrally controlling the operation of the device; wherein a pressure relief hole is formed in the air pipe main body. According to the invention, two groups of electromagnetic coils which are arranged in sections are adopted for alternate heating and are matched with multi-point temperature monitoring along the way, so that accurate partitioned heat compensation of an air-powder mixture is realized, and the problem of low-load combustion delay caused by the characteristics of low volatile component and high ignition temperature of anthracite is solved.

The present invention relates to the process for preparation of high-grade turbostratic graphene from subbituminous tertiary coal from North eastern region of India by ultrasonic-assisted chemical oxidation and ultrafiltration followed by thermal reduction process. More particularly, the present invention relates to the efficient, scalable, low-cost process for preparation of high-quality graphene by ultrasonication supported chemical oxidation, ultrafiltration followed by thermal reduction process from low-grade subbituminous Indian coals. The synthesis of coal-derived graphene material is confirmed by various analytical methods such as High-Resolution Transmission Electron Microscope (HRTEM), Field Emission Scanning Electron Microscopy (FESEM), X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and Fourier Transform Infrared (FTIR) spectroscopy. This process can produce graphene on a large scale without using harsh acids, making it safer and more eco-friendly than existing methods. The present invention offers a sustainable and effective way to produce graphene with potential applications in different domains.

According to the dehydrogenation and deashing device and method for the carbonaceous reducing agent special for the magnesium chloride molten salt bath, the carbon-containing material is added into the molten salt bath to be pyrolyzed to generate decomposed gas and carbon particles, and oxygen and a part of the carbon particles continue to react to generate the decomposed gas; most of the carbon particles burst into carbonaceous particles in the molten salt bath and suspend in the molten salt bath, and the carbonaceous material is any one or a combination of more than two of common anthracite, bituminous coal, coke, semi-coke, waste plastics, waste rubber, biomass carbon, dry organic wastes and waste textiles; a common low-quality carbon-containing material on the market is subjected to specific pyrolysis and purification means, so that the quality of a carbonaceous reducing agent required by a molten salt bath chlorination furnace is achieved, the cost of the carbonaceous reducing agent is greatly reduced, and greenhouse gas emission is reduced.

This invention discloses a NOx control method for a chain grate rotary kiln based on multi-source fuel utilization. This method, targeting different levels of environmental warnings and ultra-low emission requirements, first establishes a solid fuel combustion characteristic database including anthracite, bituminous coal, and their blends based on industrial analysis, elemental analysis, and thermogravimetric experiments. Simultaneously, it employs CFD numerical simulation technology, coupling an Eulerian-Lagrange multiphase flow model and a P-1 radiation model, to analyze the flow field and NOx formation patterns under pulverized coal and natural gas co-firing conditions. Upon receiving control commands, it calculates the inlet concentration threshold based on the real-time efficiency of the denitrification system, intelligently recommends the optimal fuel ratio using the multi-source database, and outputs corresponding kiln tail temperature, combustion air volume, and raw material structure control parameters. This invention, through a dual approach of "experimentation + simulation," achieves the suppression of fuel-type and thermal NOx formation at the source, meeting differentiated environmental indicators while ensuring stable production.

The invention discloses a muffle furnace automatic sample feeding and discharging device and method for bituminous coal caking index determination, and relates to the technical field of muffle furnaces, and the muffle furnace automatic sample feeding and discharging device specifically comprises a bearing base body, a control module, a muffle furnace, a transferring unit, a temporary storage unit, a sample feeding and discharging execution unit and a cooling unit, during operation, the temperature needs to be increased to 850 + / -5 DEG C through initialization, heat preservation is carried out, the sample is conveyed to the execution unit through the conveying unit, the sample is precisely conveyed into the furnace through the execution unit for dry distillation, automatic sampling is carried out after dry distillation, natural air cooling is carried out firstly, then forced cooling is carried out, and circulation operation is carried out. The temperature fluctuation in the furnace can be controlled within a qualified range, the potential safety hazard of manual high-temperature operation is avoided, the accuracy and repeatability of detection data are guaranteed, and the large-scale detection efficiency is greatly improved.