159 results about "Brown coal" patented technology

The invention provides a lignite-based supercapacitor activated carbon electrode material and a preparation method thereof, and belongs to the technical field of electrochemical power supply material preparation. The preparation method comprises the following steps: S1, performing hydrochloric acid pickling on lignite raw coal powder for X2 hours, performing hydrofluoric acid pickling for X2 hours, and heating a calcium phosphate solution for deoxidation to obtain pretreated lignite; s2, uniformly stirring and mixing the pretreated lignite, an alkaline activator and deionized water according to the mass ratio of 1: X4: (5-10) to obtain a mixture; s3, activation is conducted, the activation temperature is X1 DEG C, and the activation time is X3 h; cooling to obtain a roasted product; s4, acid pickling with diluted hydrochloric acid; the specific capacitance of the active carbon electrode material is Y F / g, wherein Y = a + b * X1 + c * X2 + d * X3 + e * X4-f * X1 * X2 + g * X1 * X3 + h * X1 * X4 + i * X2 * X3 + j * X2 * X4 + k * X3 * X4-l * X12-m * X22-n * X32-o * X42. The preparation method is simple, the cost is low, the process repeatability is good, the prepared porous carbon has a high specific surface area, and the power density and the cycling stability of the supercapacitor are improved.

The invention discloses a preparation method of a coal-based yellow fluorescent carbon dot aqueous solution, which comprises the following steps: drying lignite to constant weight, grinding, sieving to obtain a primary coal sample, and weighing the primary coal sample; adding the weighed primary coal sample into a mixed solution of peracetic acid and hydrogen peroxide, stirring, and filtering to obtain a pretreated coal sample; the method comprises the following steps: mixing a coal sample with water, stirring to obtain a lignite solution, transferring the lignite solution into a cavitation device, starting a cavitation program, and adjusting and maintaining the flow; collecting circulating liquid in the cavitation device, and filtering to remove residual large particles to obtain an aqueous solution of the coal-based carbon dots; the method comprises the following steps: pretreating a coal sample by using a mixed solution of peracetic acid and hydrogen peroxide, and stripping the coal sample by combining a hydrodynamic cavitation method to prepare a carbon dot with yellow fluorescence; the method is low in cost, environmentally friendly, simple in equipment and huge in large-scale production potential, and a new method and thought are provided for enriching polychromaticity of the coal-based carbon dots.

The invention discloses a method for preparing humic acid by graded oxidation and depolymerization of lignite, which comprises the following steps: weighing lignite, adding hydrogen peroxide for oxidation pretreatment, filtering and vacuum drying to obtain primarily oxidized lignite named as PTSL; and carrying out a deep oxidation experiment on the obtained PTSL by using a mixed gas of ozone and oxygen, after the oxidation reaction is finished, carrying out centrifugal filtration on the mixture, and collecting a liquid sample. The lignite is subjected to gradient oxidation depolymerization in a graded oxidation mode, the green oxidant hydrogen peroxide firstly oxidizes and breaks weak bridge bonds and side chain structures in the lignite without damaging aromatic ring structures, then the lignite is further deeply oxidized through the strong oxidant ozone, polycyclic aromatic hydrocarbon structures in the lignite are gradually damaged, and the content of the polycyclic aromatic hydrocarbon in the lignite is reduced. The step-by-step oxidative depolymerization of the organic matters in the coal is realized. According to the method, the organic matter conversion rate and the humic acid yield of the lignite can be improved, and the impurity content in the humic acid is reduced.

The invention relates to the technical field of improvement methods, in particular to a soil conditioner based on ultramicro-granulated energy-gathered humic acid, and energy-gathered humic acid raw materials of the soil conditioner based on ultramicro-granulated energy-gathered humic acid comprise weathered coal, lignite, peat, oil shale, an auxiliary additive, a thermophilic bacterial agent, an organic fertilizer and an inorganic fertilizer. According to a formula, the ratio of weathered coal to lignite to peat to oil shale to an auxiliary additive to a thermophilic bacterial agent to an organic fertilizer to an inorganic fertilizer is 4: 4: 2: 2: 1: 1: 2: 2; the ultramicro-pelletized energy-gathered humic acid soil conditioner is prepared by adopting a soil conditioner preparation method. According to the soil characteristics of the desert area, local materials can be used for improving the soil of the desert area, the soil structure of the desert area is improved, the fertility is improved, and the ecological balance of the soil is maintained.

The application discloses a coal-based solid waste disposal system and method for chemical looping combustion coupled with lignite boiler peak shaving, and the system comprises an electrolytic water device, an air reactor, a fuel reactor, a gas mixer, a condenser, a semi-gasification stable combustion burner and a boiler body, etc.; the method utilizes the redundant power generation of wind power generation and photovoltaic power generation to electrolyze water in the electrolytic water device; H2 is introduced into the fuel reactor to react, so that the oxide carrier is reduced into a metal carrier, and water vapor is generated; the metal carrier in the air reactor is subjected to an oxidation reaction with air, so that the metal oxide is generated and a large amount of fuel is released; the gasification background gas is introduced into the air reactor to be preheated, and then is mixed with the water vapor generated in the fuel reactor, and finally the semi-coke powder in the semi-coke powder system is introduced into the semi-gasification stable combustion burner, and then is introduced into the furnace through the stable combustion burner nozzle to be stably combusted; part of the water vapor generated in the fuel reactor is introduced into the condenser to be condensed, so that condensed water is obtained.

The invention discloses a classified grouting reinforcement method for a wind oxidation zone of a lignite mining roof, and relates to the technical field of coal mining, the method comprises the following steps: obtaining the average wind oxidation zone thickness, the water inflow and the average natural gamma value covering each weighting step section on a lignite mining working surface to be mined; according to the average wind oxidation zone thickness, the water inflow and the average natural gamma value corresponding to each weighting step section, a set number of drilling points are determined on the lignite mining working face; the drilling leakage amount of each drilling point is obtained; based on the data of each drilling point, determining the function relationship between the drilling leakage amount and the average wind oxidation zone thickness, the water inflow amount and the average natural gamma value; according to the function relation, the drilling leakage amount of each weighting step section is determined; dividing the drill hole leakage amount of each weighting step section into a plurality of grades of slurry eating areas; and different grouting technologies are adopted for grouting reinforcement of the slurry eating areas of all the grades. Top plate accidents can be reduced, grout leakage is reduced, in addition, the grouting cost is reduced simply.

The invention provides a preparation method of a coal-based extract, which comprises the following steps: extracting lignite by using a first solvent, separating an extracting solution, removing the solvent to obtain a solid product, dissolving the solid product in a second solvent, standing to separate out a solid, separating a solution, and removing the solvent to obtain the coal-based extract. The invention also provides the coal-based extract prepared by the preparation method and application of the coal-based extract as an antifouling agent. The invention further provides an antifouling paint. The coal-based extract provided by the invention can effectively prevent adhesion of marine organisms, does not contain metal elements such as copper and tin, is high in safety and environment-friendly, has better compatibility with matrix resin in the antifouling paint, and can realize stable and slow release of effective components, and the preparation method provided by the invention is wide in raw material source, low in cost and suitable for industrial production. The extraction process is simple and convenient, and the operability is strong, so that the method has good industrial practicability and is suitable for large-scale production and application.

The invention discloses a coking device for lignite blending, and relates to the technical field of coal coking, the coking device comprises a coking furnace, the top of the coking furnace is fixedly provided with a box body, the two sides of the box body are both provided with storage boxes, the bottoms of the storage boxes are fixedly provided with hollow cylinders, and the sides, away from each other, of the two hollow cylinders are both fixedly provided with first servo motors; output shafts of the first servo motors penetrate through one side of the hollow cylinder and are fixedly provided with first augers; the two independent first servo motors are used for driving the augers at the bottom of the storage box respectively, the conveying amount of lignite and other coal types can be accurately controlled by adjusting the rotating speed of the motors, the deviation of the coal blending proportion is greatly reduced, it is ensured that the mixed coal meets the preset formula requirement all the time, and the coal blending efficiency is improved. Coke quality fluctuation caused by proportion imbalance is reduced from the source, stable performance of subsequent coking products is guaranteed, and the coal crushing and mixing effect is improved.

The invention relates to the technical field of boiler combustors, and discloses a cyclone combustor based on large-proportion blending combustion of lignite. The primary air pipe is arranged on the peripheral side of the central air pipe in a sleeving mode and connected with a pulverized coal inlet elbow, the pulverized coal inlet elbow is connected with an eccentric pipe, and the axis of the eccentric pipe is located on the rear side of the axis of the pulverized coal inlet elbow; and the secondary air pipe is sleeved on the outer side of the central air pipe. In addition, the invention further discloses application of the cyclone burner based on large-proportion lignite blending combustion. Primary air pulverized coal airflow from a coal mill is accelerated through an eccentric pipe in front of a burner elbow, and due to the action of centrifugal force, about 50% of primary air and about 15% of pulverized coal enter a hearth through a waste steam nozzle. And the remaining primary air and pulverized coal enter the hearth through the primary air nozzle. The pulverized coal is ignited through inner secondary air, and then the pulverized coal is fully combusted through a large amount of outer secondary air. By the adoption of the air distribution mode, stable combustion of the hearth is guaranteed, and generation of NOx is reduced.

The invention discloses an internal and external simultaneous heating type low-temperature dry distillation system and process, which are suitable for 0-30mm set particle solid raw materials (the low-rank coal is 0-50mm) and can be applied to the fields of oil shale dry distillation, lignite upgrading and the like, and products comprise coke, semi-coke, tar and dry distillation gas. The core of the system is a horizontal rotary sleeve type dry distillation furnace, a drying bin and a dry distillation bin which are coaxial are arranged in the horizontal rotary sleeve type dry distillation furnace, and an annular space is formed by an outer cylinder and an inner bin. High-temperature hot flue gas in the annular space is subjected to radiation and conduction heat transfer, and hot slag is backmixed according to the proportion of 1 / 4-1 / 3 of materials in the bin, so that direct heat transfer is achieved; heat energy is utilized in a gradient mode, waste heat is subjected to gas-solid heat exchange, and fluid is mixed and recycled. According to the process, drying, destructive distillation and combustion are integrated in one furnace, energy output loss of a traditional process is avoided, generation of nitric oxide is inhibited through low-oxygen combustion, and moisture removed through drying can be recycled. The heat efficiency is high, integration is high, the operation and maintenance cost is low, and efficient resource utilization of low-quality solid raw materials is achieved.

The invention discloses a dezincification process for steelmaking dust sludge of a rotary kiln, and belongs to the technical field of metallurgical solid waste resource utilization. According to the method, Fe2O3 in the dust sludge is preliminarily reduced into Fe3O4 and a small amount of FeO through the coke powder, H2 is generated through lignite pyrolysis to replace part of C for reduction, and efficient reduction and separation of zinc and iron in the dust sludge through carbon-hydrogen compounding in the rotary kiln are achieved. According to the method, the brown coal is excessively added, so that ferric oxide in the raw materials is fully reacted, meanwhile, oxygen is isolated by controlling the state of the kiln head, kiln slag is recycled after being cooled, FeO is prevented from being formed again, the ring forming phenomenon of the rotary kiln is relieved, and then the continuous working time of the rotary kiln is prolonged.

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 provides a system and a method for upgrading lignite by using flue gas of a coal-fired power plant. The system for upgrading the lignite by using the flue gas of the coal-fired power plant comprises a lignite upgrading device which is provided with a wet coal inlet, a dry coal outlet, a first flue gas inlet, a first flue gas outlet and a first water vapor outlet; a flue gas outlet of the pulverized coal boiler is connected with the flue, the flue is provided with a first flue gas connector, and the first flue gas connector is connected with a first flue gas inlet of the lignite upgrading device through a first pipeline; an inlet of the separator is connected with a smoke outlet of the lignite upgrading device, a second smoke outlet of the separator is connected with an inlet of the booster fan, and an outlet of the booster fan is connected with a smoke exhaust connector of the flue through a second pipeline; provided is a dry lignite collecting device. Therefore, according to the system for upgrading the lignite by using the flue gas of the coal-fired power plant, the lignite can be conveniently upgraded, the energy waste is reduced, and the safety is high.

The invention discloses a theoretical correction-based fire prevention and extinguishing comprehensive control method for a strip mine with an extremely thick lignite layer, and belongs to the technical field of mine safety. Comprising the following steps: S1, calculating a theoretical minimum coverage thickness based on a gas seepage theory, and correcting in combination with fracture development, material water sensitivity and long-term high-temperature stability factors to obtain an engineering application recommended thickness; s2, constructing an air-ground-fixed integrated three-dimensional monitoring and early warning system, monitoring the deviation of the actual coverage state relative to the recommended thickness, and giving an early warning; s3, on the basis of the monitoring information, implementing treatment for sedimentation fractures, channel blocking of a key partition interface and combustible material management; and S4, starting graded emergency response according to the early warning grade, and executing fire control and extinguishment, regional isolation and post reinforcement. According to the method, the scientific coverage thickness is determined through combination of theoretical calculation and engineering correction, closed-loop management of monitoring, early warning, prevention and control, disposal and review is formed, active prevention and systematic control over the spontaneous combustion risk of the coal seam are achieved, and scientificity, accuracy and economical efficiency are achieved.

The present application belongs to the technical field of lignite treatment, and particularly relates to a method for improving lignite thermal conversion to produce high-value chemicals. In the present application, in the process of gasification, the catalytic active components in the carbide slag can have synergistic and catalytic effects with the minerals in the lignite. The treatment method provided by the present application can overcome the problems of low energy density, poor gasification efficiency, high tar yield and the like existing in the lignite gasification alone, effectively improves the carbon conversion rate per unit of coal, and greatly advances the reaction temperature zone. In the aspect of coal pyrolysis, the carbide slag can intervene in the pyrolysis reaction path, promote the cracking and conversion of macromolecular organic matter, and be helpful to the production of high-quality tar. The present application fully utilizes the catalysis of the carbide slag on the lignite for gasification or pyrolysis, effectively improves the carbon conversion rate per unit of coal, greatly advances the reaction temperature zone, and simultaneously can directionally regulate and control the production of high-value chemicals in the pyrolysis process, and produce high-quality tar.

A method for preparing SiC nanorods using lignite, which relates to a method for preparing SiC nanorods. The invention aims to solve the problem of how to prepare SiC nanorods using lignite. Preparation method: 1. mixing lignite and silicon source evenly, then sieving and pressing into shape; 2. carbonization reaction and sintering reaction; 3. ultrasonic treatment and grinding. The invention is used for preparing SiC nanorods using lignite.

The present invention discloses a device and a drying method for preventing columnar lignite specimens from drying out and cracking, and belongs to the technical field of coal quality analysis. The device includes a cement casting mold, which is used to encapsulate the periphery of the columnar lignite specimen to limit the cement casting area; a demolding device, which is connected to the outer surface of the columnar lignite specimen before casting, and is used to destroy the hardened cement shell encapsulating the outside of the coal specimen after drying; a bottom plate, which is used to support other components of the device; and a cement pad, which is used to block the bottom of the cement casting mold. Drying the columnar lignite specimen using the device disclosed in the present application can maintain the original structure of the columnar lignite specimen to the greatest extent. The coal specimen will not produce large cracks during the drying process, and will not directly break into coal particles, which is convenient for subsequent observation; and the molding process is simple, and the demolding process can also ensure the integrity of the sample. There is no technical difficulty in operation, and it is worthy of popularization and application.

The invention belongs to the technical field of yield increase of methane gas by anaerobic degradation of lignite, and provides a method for producing methane gas by anaerobic degradation of lignite by mixing exogenous bacteria and straws. According to the method, temple river coal seam water enrichment culture flora is used as exogenous bacteria, Inner Mongolia Shengli lignite is used as a gas production substrate, the same culture medium and bacterial liquid are added, and the influence of coal, straw and addition of the coal and the straw on the methane gas production rate is analyzed. After two months of monitoring, the net methane yield of a straw and coal (1: 1) group is 84.28 mL, and the net methane yield is 28.09 mL / g; the net methane yield of a coal group is 33.15 mL, and the net methane yield is 11.05 mL / g; the gas production rate of the straw and the coal as the substrate is more than two times that of the single coal as the substrate. According to data calculation of bottled experiments, the daily gas production rate of the exogenous bacteria for degrading the coal and the straws is 0.47 m < 3 > / t / d. The exogenous bacteria and the straws jointly act on the lignite, so that the gas volume and the gas production rate are obviously increased. And the generated methane can also be used as a green energy source in other fields.

The present disclosure provides a kind of integrated ejector lignite drying supercritical CO2 power generation system and method, by coupling deeply with supercritical CO2 coal-fired power generation system through ejector lignite drying system, utilize high-temperature high-pressure CO2 working substance of high-temperature regenerator outlet to eject low-temperature low-pressure CO2 working substance of low-temperature regenerator outlet, form the medium-temperature medium-pressure working substance matching with the temperature and lignite drying demand, drive rotary drum dryer to carry out pre-drying treatment to high-moisture lignite;At the same time, the water vapor released in drying process is condensed to recover condensate water, and low-moisture lignite after drying is sent into boiler for combustion.The cold source loss is significantly reduced, and the system comprehensive energy efficiency, combustion efficiency and unit power supply efficiency are improved.In addition, the condensate water generated in the process of lignite drying is recovered, which reduces the water consumption of the unit, and energy efficient utilization and resource saving are considered.

The application discloses a production process of potassium fulvate of mineral origin, which uses weathered coal and / or lignite as raw materials, and comprises the following steps: raw coal slurry preparation, ultrasonic-assisted weak-alkali low-temperature closed-loop extraction, double-stage centrifugal separation and solar drying system drying to prepare high-activity potassium fulvate of mineral origin. The extraction is carried out at 45-55 DEG C, pH 11-12, ultrasonic power 3-5 kW and frequency 25-30 kHz for 30-60 min, and the extraction rate of fulvic acid is 65%-75%; the solar drying system is configured with an automatic turning and throwing system, a circulating ventilation system and a meteorological linkage system, and the crude liquid with a water content of 75% is dried to 15% in the whole process without waste water and carbonization. The application has the advantages of high extraction rate, low energy consumption, short time, high product activity, high small molecule content, no residue in full water solution at 25 DEG C and suitability for large-scale clean production.

The invention belongs to the technical field of lignite treatment, and particularly relates to a method for improving lignite thermal conversion to produce high-value chemicals. According to the invention, in the gasification process, catalytic active components in the carbide slag and mineral substances in the lignite can generate synergism and catalysis effects. The treatment method provided by the invention can overcome the problems of low energy density, poor gasification efficiency, high tar yield and the like existing in independent gasification of lignite, effectively improves the carbon conversion rate of unit coal, and greatly advances the reaction temperature zone. In the aspect of coal pyrolysis, the carbide slag can intervene in a pyrolysis reaction path, so that the cracking and conversion of macromolecular organic matters are promoted, and the production of high-quality tar is facilitated. According to the method, the carbide slag is fully utilized to catalyze the lignite for gasification or pyrolysis, the carbon conversion rate of unit coal is effectively improved, the reaction temperature zone is greatly advanced, and meanwhile, high-value chemicals and high-quality tar can be directionally regulated and produced in the pyrolysis process.

The invention relates to a protective layer for reducing coke burning loss and a preparation method. The protective layer is composed of at least two materials of lignite, long flame coal, coking fly ash, semi-coke powder and coal slime. And the protective layer comprises the following materials in parts by weight: 0-58 parts of lignite, 23-60 parts of long flame coal, 0-22 parts of coking fly ash, 0-26 parts of semi-coke powder and 0-17 parts of coal slime. According to the invention, the burning loss of early-stage cake coal and later-stage coke is reduced, the coking rate is improved, the coal consumption is reduced, and the ash content and the strength index of the coke are stabilized.

The invention relates to the technical field of coal washing, and particularly discloses a synthesis process of an environment-friendly coal washing flotation reagent collecting agent. According to the process, abietic acid modified vegetable oil is used as a raw material, the amphiphilic structure collecting agent is constructed through a three-step method, the obtained collecting agent has high collecting performance and environmental compatibility, and the clean coal recovery rate can be increased while the dosage of the agent is reduced; aromatic ring adsorption on the surface of coal is enhanced through a rigid abietic acid skeleton, hydrophilicity is improved through a sulfonated chain, and efficient mineralization of coal particles is achieved in combination with the interface regulation and control effect of a biosurfactant. No toxic solvent participates in the whole process, the byproduct is only water vapor, the method is suitable for flotation of various coal types such as coking coal, gas coal and lignite, and the industrial problem that the surface hydrophobicity of oxidized coal is poor is particularly solved.

The application discloses a lignite soft rock broken surrounding rock anchor net cable coupling supporting device and a construction method, and belongs to the technical field of coal mine roadway supporting. The device comprises a coupling anchoring assembly, a cooperative table protecting assembly and a connecting conducting assembly. The coupling anchoring assembly comprises an anchor rod, an anchor cable and a coupling anchoring sleeve pipe, the anchoring end of the anchor rod is provided with an anchoring tooth block, the anchoring end of the anchor cable is provided with an anchor head, and the coupling anchoring sleeve pipe connects the anchor rod and the anchor cable. The cooperative table protecting assembly comprises a flexible protective net, a rigid supporting plate and a buffer pad layer, and the three are sequentially attached and arranged, and the anchor rod and the anchor cable pass through the three. The connecting conducting assembly comprises a coupling connecting sleeve, a conducting pull rod and an adjusting screw rod, the coupling connecting sleeve is sleeved outside the coupling anchoring sleeve pipe, and adjacent coupling connecting sleeves are connected through the conducting pull rod. The anchor rod, the anchor cable and the protective net are connected into a whole through the connecting conducting assembly, a three-stage supporting system is formed, and large deformation of soft rock is effectively resisted.

The utility model discloses a lignite fermentation machine, relates to the technical field of lignite fermentation, and aims to solve the technical problem that the overall fermentation degree of lignite in the fermentation machine is not high due to the fact that the current stirring structure is inconvenient to mix lignite in the axial direction and microorganisms are easy to agglomerate in partial areas in the fermentation machine. Comprising a frame body assembly in which a fermentation assembly is fixedly arranged, the fermentation assembly comprises a fermentation box in which a stirring assembly is rotatably mounted, the stirring assembly comprises a rotating shaft of which the outer edge surface is equidistantly provided with a stirring part E and a stirring part F, and the stirring part E and the stirring part F are arranged in a staggered manner; the stirring part E and the stirring part F respectively comprise a stirring rod A and a stirring rod B which are symmetrically and fixedly arranged on the outer edge surface of the rotating shaft, and the ends, away from the rotating shaft, of the stirring rod A and the stirring rod B are fixedly connected with material scraping structures which are obliquely arranged. The device has the advantage that the lignite can be axially pushed and mixed in the lignite fermentation process.

The application discloses a carbon-coal composite functional material and a preparation method and application thereof. The preparation method of the carbon-coal composite functional material comprises the following steps: 1) pulverizing and sieving lignite and straw; 2) pyrolyzing the straw obtained in the step 1) under an inert atmosphere to obtain a straw biochar material; 3) washing the straw biochar material obtained in the step 2) to neutral with deionized water, air-drying and crushing; and 4) mixing the straw biochar material obtained in the step 3) with the lignite obtained in the step 1) and pyrolyzing under low temperature and oxygen, so that the carbon-coal composite functional material is obtained. The carbon-coal composite functional material is applied to adsorb substances containing NH3 / NH4 + . The modified carbon-coal composite material has the advantages of large specific surface area, dense pore, high humic acid content and rich oxygen-containing functional groups, and has remarkable effects on absorbing NH4 + .

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 provides a coal-fired unit air pre-heater anti-blocking lifting coupling coal type adapting system and method.The system comprises a boiler body, the boiler body is provided with a bypass flue, the bypass flue is connected with an efficient flue gas heat exchanger, the efficient flue gas heat exchanger is connected with a denitration SCR, an outlet of the denitration SCR is connected with an air pre-heater, and an outlet of the denitration SCR is connected with the air pre-heater; the primary air cold air duct is connected with the air preheater, the air preheater is connected with the coal mill, the coal mill is connected with the boiler body, the secondary air cold air duct is connected with the air preheater, and the air preheater is connected with the boiler body. The air temperature of an inlet of the air preheater is greatly increased, the smoke temperature of a heat storage element of the air preheater is increased, the temperature of a metal wall of the air preheater is increased, ammonium hydrogen sulfate deposited on the air preheater is completely gasified, the problem of blockage of the air preheater is solved, and the service life of the air preheater is prolonged. When lignite or Zhundong coal is mixed and combusted in the unit, the temperature of primary air entering the coal mill can meet the requirement for drying output of the coal mill, the temperature of secondary air is increased as much as possible, combustion is optimized, and combustion efficiency is improved.

The application discloses a sorting method of fine lignite based on forced slurrification-high-efficiency deslurrying, and belongs to the technical field of lignite washing and processing, and aims at solving the problems of large coal slurry water treatment capacity and large viscosity of circulating water in the prior art. The method comprises the following steps: performing dry screening on lignite raw materials, wherein the screened material is first clean coal, and the screened material is directly discharged into a product bin; performing wet screening on the low-ash lump coal, wherein the screened material is second clean coal, and the screened material is directly discharged into the product bin; mixing the low-ash lump coal with water, and performing slurrification treatment on the coal-water mixture, so that pre-slurrification treatment of the lignite is realized, and slurrified granular coal is obtained; performing deslurrying treatment on the slurrified granular coal, so that coarse-grained coal slurry and fine-grained coal slurry are obtained; and performing dewatering treatment on the coarse-grained coal slurry, and the solid product after dewatering is third clean coal. The application can be used for sorting fine lignite.

The invention provides a coking coal additive as well as a preparation method and application thereof. The coking coal additive comprises organic extracts of asphalt, titanium dioxide, kaolin, diboron trioxide and lignite. Through research, the coking coal additive provided by the invention is used for coal blending and coking, can be used for improving the strength of coke after reaction, or increasing the ratio of weak caking property or non-coking coal resources, reducing the cost and expanding the coking coal source under the condition that the strength of the coke after reaction is not changed, and has a good popularization and application prospect in the coking industry.