128 results about "Brown coal" patented technology

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 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.

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 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 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 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 discloses a preparation method of coal-based red fluorescent carbon dots, and belongs to the technical field of coal-based carbon nanomaterials. The preparation method of the coal-based red fluorescent carbon dots comprises the following steps: adding lignite into a mixed solution of concentrated sulfuric acid and concentrated nitric acid, carrying out a first mixing reaction, adjusting the pH value to be neutral by using ammonia water, and carrying out a second mixing reaction to obtain a coal sample; a coal sample is added into water to prepare a lignite mixed solution, then the lignite mixed solution is subjected to cavitation stripping treatment, and the coal-based red fluorescent carbon dots are obtained. The coal-based carbon dots with the red fluorescence characteristic are prepared, the common problem that fluorescence of the coal-based carbon dots prepared through a current mainstream chemical oxidation stripping method is generally blue is solved, and a brand-new technical path and solution are provided for expanding the fluorescence wavelength range of the coal-based carbon dots and enriching the polychromaticity of the coal-based carbon dots.

The invention discloses a mining area corner coal pillar mining method and mining equipment thereof, and relates to the technical field of lignite mining. The supporting problem is solved. The method specifically comprises the following steps that geological exploration and mining areas are delimited, and the geometrical morphology of corner coal pillars, the coal seam thickness and the lithology of a top plate and a bottom plate are determined by combining three-dimensional seismic exploration with a drilling peeping technology; an area with the coal pillar width larger than or equal to 8 m and the dip angle smaller than 25 degrees serves as a mineable area; two parallel roadways are constructed in the coal pillar trend, and a gob-side entry retaining technology is adopted to reserve a mining side roadway as a next subsection channel. On the basis of adopting multi-section mining, the hydraulic support and the gangue paste are adopted for synchronous filling during mining, so that the stability of the whole mining area is improved, in addition, the gangue paste is formed by mixing coal gangue, cement and fly ash in a fixed proportion, the bearing capacity can be increased on the basis of achieving quick drying, and the mining efficiency is improved. And the stability of the mining area is further improved, and collapse is prevented.

The present invention relates to a high-strength and high-specific-surface-area coal-based powdered activated carbon and a preparation method thereof, belonging to the technical field of activated carbon preparation. In the present invention, anthracite, lignite, and weakly caking coal are mixed and ground and heat-treated, so that the prepared activated carbon has more types of pore structures, thereby increasing the specific surface area and improving its adsorption capacity. Subsequent steps such as phosphoric acid treatment, addition of zinc chloride, and ultrasonic treatment help to further optimize the pore structure and increase the specific surface area; the formula of the present invention enables the final product to have a higher specific surface area and porosity. The addition of coal tar pitch and alumina helps to improve the mechanical strength of the activated carbon, making it more durable during use. The chemical components in the coal tar pitch will promote the formation and expansion of pores during the carbonization process, thereby optimizing the pore structure of the activated carbon. The addition of alumina can combine with the surface of the activated carbon through chemical or physical actions to form a stable protective film or modified layer.

The present application provides a kind of dual-cycle combustion stabilizing system of mixed combustion boiler, belongs to coal mixed combustion technical field.The system, including lignite dryer, condensate device, poor lignite conveying device, intelligent analysis device, heat exchanger, bypass flue air blower, coal mill and SCR denitration device.Intelligent analysis device controls bypass flue air blower and extracts excess flue gas volume and is transported to heat exchanger.And control bypass flue air blower and transport the excess flue gas volume after heat exchange to coal mill, to supplement the air volume output to coal mill, reach the effect of flue gas circulation, improve the air volume transported to coal mill.At the same time, heat exchanger uses condensate heat exchange to obtain high-temperature steam, and transports high-temperature steam to lignite dryer.Lignite dryer uses high-temperature steam to dry poor lignite to obtain low-temperature condensate, and transports low-temperature condensate to condensate device, to achieve the effect of water circulation.Thereby realize lignite upgrading, improve the purpose of combustion efficiency, and have protective effect to boiler and auxiliary machine.

The invention discloses a communication type boiler powder adding combustion system and method. The communication type boiler powder adding combustion system comprises a hearth, a flue, a solid combustor, a gas combustor, a raw coal pulverizing device, a lignite pulverizing device and a biomass pulverizing device, and the flue is communicated with the hearth; the solid burner and the gas burner are both arranged in the hearth; the raw coal pulverizing device, the lignite pulverizing device and the biomass pulverizing device are respectively communicated with the gas burner and the solid burner. Different types of fuels are used, the types and proportions of the fuels are adjusted according to the requirements of a power grid, and the more flexible peak regulation capacity is provided. Biomass is a renewable energy source, and carbon dioxide generated by combustion of the biomass can be absorbed in the growth process, so that carbon neutralization is realized. The biomass powder is used as fuel, so that the overall carbon emission can be reduced. By accurately controlling the mixing proportion of the fuel and the combustion gas, the combustion process can be optimized, the combustion efficiency can be improved, and energy waste can be reduced.

The application discloses a method for preparing humic acid by graded oxidative depolymerization of lignite, comprising the following steps: weighing lignite, adding hydrogen peroxide for oxidation pretreatment, filtering and vacuum drying to obtain preliminarily oxidized lignite, named as PTSL; using a mixed gas of ozone and oxygen to perform deep oxidation experiment on the obtained PTSL, and after the oxidation reaction is completed, centrifugal filtration is performed on the mixture, and a liquid sample is collected. The lignite is subjected to graded oxidative depolymerization in a graded oxidation mode, the weak bridge bond and side chain structure in the coal are first oxidatively broken by the green oxidant hydrogen peroxide without damaging the aromatic ring structure, then the lignite is further oxidized by the strong oxidant ozone to gradually damage the polycyclic aromatic hydrocarbon structure in the coal, and step-by-step oxidative depolymerization of the organic matter in the coal is realized. The method can improve the organic matter conversion rate and the humic acid yield of the lignite and reduce the impurity content in the humic acid.

The invention provides a fan mill lignite boiler plasma ignition method, system and related device, the fan mill lignite boiler plasma ignition system comprises a plasma pulverized coal burner and a plasma generator, and the plasma generator is obliquely inserted and installed on the side face of a spray pipe of the plasma pulverized coal burner in the radial direction; the technical problem that the plasma generator cannot be axially installed due to the fact that the arrangement positions of the fan mill pulverized coal pipeline and the combustor are limited is effectively solved, and the plasma generator is particularly suitable for the special structure that the distance between a pulverized coal elbow and a combustor spray pipe is long and the height is inconsistent in a fan mill pulverizing system.

The invention provides a preparation process of a feed additive organic trace humic acid iron (complex) chelate, the specific flow comprises coal (peat, lignite and weathered coal) mineral separation, coal mine crushing and oxidation chain scission, coal water slurry preparation, fine selection and impurity removal, biological acidification reaction, enzymatic hydrolysis reaction, chelation reaction and drying granulation, and the complex (complex) rate of the prepared complex (complex) is greater than 95%. The invention solves the technical problems that the existing humic acid iron product is prepared by physical modes such as mixing, roasting, washing, concentration crystallization and the like or chemical reaction and is low in utilization rate, and solves the technical problems that in the prior art, the pH value of gastrointestinal tracts is regulated only by utilizing acidity of ferric sulfate or humic acid is utilized to promote feed activation and absorption, regulate intestinal health and the like; and the problem that the iron absorption rate is improved by an iron combination form is not fundamentally solved.

The invention belongs to the technical field of lignite drying, and discloses a waste heat recycling system and method in the lignite drying production process, and the system comprises a tower body, a feed port, a discharge port, an air inlet pipe, an air outlet pipe, a heat dissipation pipe, a moisture exhaust fan and a belt elevator; the top of the tower body is provided with a feed port with a switch door, and the bottom is provided with a discharge port with a valve; an air inlet pipe is arranged in the tower body above the discharge port, and an air outlet pipe is arranged in the tower body below the feed port; a plurality of heat dissipation pipes are communicated between the air inlet pipe and the air outlet pipe; the dehumidifying fan is mounted at the top of the tower body and is used for exhausting water vapor generated in the tower body; the belt elevator is arranged on one side of the tower body, and a discharging opening of the belt elevator is located over the feeding opening; moisture in the feed coal is evaporated under the heat conduction of the heat dissipation pipes and the heat dissipation fins, and is discharged out of the tower body under the negative pressure action of the moisture removal fan. Static material baking is achieved, material loss is reduced, the finished product recovery rate is increased, tail gas emission is reduced, and waste heat resources are fully utilized.