360 results about "Combustibility" patented technology

The present invention relates to a contact combustion gas sensor provided with a coil-exposed detection element for detecting flammable gas leakage, and a method for manufacturing the same, the contact combustion gas sensor being provided with a detection element (210) that reacts with contact gas and a compensation element (260) that does not react with contact gas, the detection element (210) comprising a coil wire (222) and a thermal block (240), the coil wire (222) has a coil shape, an exposed portion of the coil wire (222) that is in direct contact with the outside air performs a direct catalyst combustion reaction with gas in contact with the outside air, and the thermal block (240) is disposed inside the coil wire (222), and a portion of the thermal block (240) is coupled to the coil wire (222) to support the coil wire (222).

The invention discloses a coal gangue-based solid fuel which comprises pulverized coal, coal gangue particles, a binder, a combustion improver and a sulfur-fixing agent. After the combustion improver prepared by the method disclosed by the invention is added into the solid fuel, the ignition point of the fuel can be obviously reduced, the flammability index of the fuel is improved, and the combustion performance of the solid fuel is greatly improved.

To provide a cooking device capable of achieving improvement in combustibility of a grill burner and uniform grilling of an object to be cooked while improving a lamp black burning effect by an after burner.SOLUTION: An after burner is attached to the upper side of an exhaust duct in a posture in which a burning surface is directed downward. A control plate 61 is provided in a communication port between a grill chamber and the exhaust duct. The control plate 61 includes an opening part 63, a right closing part 64, a left closing part 65, a right half opening part 66, and a left half opening part 67. The opening part 63 is provided in the center of the control part 61 and opens the communication port. The right closing part 64 and the left closing part 65 are provided on both of the right and left end sides of the control plate 61, and close the communication port. The right half opening part 66 is provided between the right closing part 64 and the opening part 63, and the left half opening part 67 is provided between the left closing part 65 and the opening part 63. The right half opening part 66 and the left half opening part 67 close the lower half of the communication port and open the upper half.SELECTED DRAWING: Figure 9

An open riser anti-gravity mold filling integral solidification process device comprises anti-gravity casting equipment, a casting mold, a contact, a cut-off mechanism, a guide sleeve and a plunger. The casting mold is one or a combination of a sand mold, a metal mold and a ceramic mold, the casting mold is composed of a bottom sprue layer, an upper structure layer and an internal structure, and an open riser is arranged at the top of the upper structure layer in the casting mold; and the contact is positioned in the open riser of the casting mold. The invention further claims to protect an open riser casting mold anti-gravity mold-filling integral solidification process method using the open riser anti-gravity mold-filling integral solidification process device. The open riser casting mold anti-gravity mold-filling integral solidification process method sequentially comprises the following steps: preparing a casting mold; installing equipment; performing anti-gravity mold filling; intercepting and releasing pressure; and solidifying. The method is stable in mold filling, less in slag inclusion, less in pinhole and high in feeding capacity; air holes and cold shut can be avoided, and the combustible atmosphere concentration can be effectively reduced; the universality is high, and the production efficiency, the stability and the safety are high.

The invention provides an electrolyte adopting double salts and an efficient flame-retardant additive and application of the electrolyte in a lithium iron phosphate battery, and relates to the technical field of lithium iron phosphate batteries. The electrolyte comprises double salts, a flame retardant additive and a solvent, wherein the double salts are lithium bis (fluorosulfonyl) imide (LiFSI) and lithium hexafluorophosphate (LiPF6). Preferably, the electrolyte contains a high-fluoro diluent, so that the overall solvation ability of solvent molecules can be reduced, and a high-stability solvation structure is formed. The electrolyte provided by the invention can inhibit generation of combustible gas and improve the energy density of the lithium iron phosphate battery, and the additive in the formula is beneficial to formation of a stable SEI film on the surface of an electrode and reduction of loss of active substances, so that the service life of the battery is prolonged.

The invention relates to the technical field of refrigeration air conditioners, in particular to an efficient environment-friendly low-GWP air conditioner refrigerant formula and a preparation method thereof. The technical problem that an existing low-GWP refrigerant is high in flammability is solved. According to the refrigerant formula prepared by the invention, a high-energy-efficiency natural working medium and an ultralow-GWP fourth-generation refrigerant are taken as main components, a small amount of phosphorus-nitrogen hybrid compound is added as a flame-retardant additive, and the main components are mixed under the conditions of low temperature and high pressure. The flame-retardant additive adopted by the invention has excellent flame retardance, and can capture free radicals and release inert gas to inhibit combustion chain reaction during combustion. Nanoscale dispersion of the additive is realized through a low-temperature ultrasonic-assisted microjet homogenization technology, and the stability of the components is ensured by utilizing online monitoring. According to the refrigerant prepared by the invention, the combustibility is greatly reduced while the refrigeration performance is ensured, and both low GWP and low combustibility are realized.

The present invention relates to the technical field of phosphorus-nitrogen synergistic flame retardant materials, and particularly relates to triazine ring compounds, preparation methods, triazine ring phosphorus-containing flame retardants and applications. The chemical structure of the triazine ring compound simultaneously has a phosphorus-containing group and a nitrogen-containing group. During the combustion process, the phosphorus-containing group forms P· radicals and PO· radicals, which quench H· and HO· radicals in the gas phase, having a gas-phase flame retardant effect. At the same time, the phosphorus-containing group is further oxidized to form phosphoric acid, promoting the formation of a dense carbon layer in the polymer matrix, achieving the effect of condensed-phase flame retardancy; the nitrogen-containing group can form non-combustible components such as ammonia and nitrogen oxides during the combustion process, effectively reducing the concentration of oxygen and combustible gases in the combustion area, achieving the purpose of gas-phase flame retardancy; the phosphorus-containing group and the nitrogen-containing group can exert the phosphorus-nitrogen synergistic flame retardant effect, thereby achieving the purpose of high-efficiency flame retardancy.

The application provides a liquid nitrogen washing tail gas resource utilization system and method, and belongs to the technical field of tail gas treatment and energy recovery. The application uses a heat exchanger (1) to heat exchange the liquid nitrogen washing tail gas, so that the liquid nitrogen washing tail gas is combusted at a suitable working temperature of a first catalyst (3). In the application, the first catalytic combustion tower (2) is communicated with a constant temperature device, so that the temperature of the first catalytic combustion tower (2) is stably kept at 250-320 DEG C, the safety hidden danger caused by violent reaction is eliminated, and the catalyst cost is significantly reduced. Meanwhile, the steam generated after the constant temperature device is cooled can be used for enterprise heating and heating, and economic benefits are created. The application uses a second catalytic combustion tower (4) to fully catalytically oxidize the combustible gas in the first flue gas, and the generated second flue gas is partly used for heat exchange of the heat exchanger (1), and the gas after heat exchange and the other part of the second flue gas are used for heat supply of a coal mill (6), so that the heat is fully recycled and utilized.

The present invention provides a flavor needle, a preparation method thereof, and its use in tobacco. The preparation method of the flavor needle comprises the following steps: (1) pretreatment of raw materials; (2) extraction; (3) removal of residues and impurities; (4) preparation of dry powder; (5) preparation of flavoring agent; (6) preparation of flavor needle. The flavor needle prepared by the present invention has good combustibility, prominent flavor, has functional effects, can be directly eaten, is easy to carry, convenient and fast to use, and has high selectivity; it can be used in tobacco sections and non-tobacco sections, can be used alone or adhered to each other using a food binder as a composite flavor needle, and adopts segmented different flavors, so as to realize the transformation of different flavors in the front section, middle section, rear section, and end section.

The present invention relates to particular combustors, and e.g., to a combustor comprising a central primary fuel lance, a pilot fuel conduit, a primary oxidant conduit, a secondary oxidant conduit, and optionally a secondary fuel conduit, which are arranged in a particular and advantageous manner so as to surround each other at least in their downstream sections. The invention also relates to a furnace comprising the burner and a method of operating the burner. The burner according to the invention provides, in particular, a particularly advantageous way that comprises a pilot burner as part of the main burner in order to ignite a liquid fuel flame in a cold furnace. If desired, the pilot flame may help extend the flammability limit or operating range of the liquid fuel burner.

The invention relates to the technical field of civil fuels, in particular to a civil ether-based fuel which is formed by mixing C5 and dimethyl ether. The content of the C5 is 10-30% by weight, the content of the dimethyl ether is 70-90% by weight, the C5 adopted by the civil ether-based fuel is a low-pressure flammable liquid and can still be stored in a common low-pressure steel drum after being mixed with the dimethyl ether, a high-pressure container is not needed, and the leakage and explosion risks are reduced; and during combustion, 'air-light hydrocarbon mixed gas' generated by a special gas generator is saturated gas, is easy to mix with air and is not easy to gather together, so that the occurrence of emergency accidents such as explosion or poisoning and the like is reduced.

The utility model relates to a cigar smoke panel test auxiliary device. The cigar smoke panel test auxiliary device comprises a box body and an air generator, the box body comprises a detachable upper top cover, side walls and a lower bottom plate; a pipe body is arranged in an inner cavity of the box body; two ends of the pipe body are fixedly and tightly connected with the box body through nuts; and the like. When the cigar smoke panel is used, a sensory smoke panel test of multi-cigarette multi-dimensional comparison is carried out in a group, if cigars can be combusted for a long time, comparison in the group can be carried out at the same time, the cognitive burden and the taste memory requirement of smoke panel test personnel are reduced, and the cigar smoke panel test efficiency is improved. Meanwhile, by means of the design, smoke panel test personnel can smoke more cigarettes compared with smoke panel test personnel under the equivalent nicotine intake burden within the same time. The comparison purpose is achieved, the smoke panel test efficiency is improved, and a more accurate comparison conclusion is obtained. And meanwhile, the device is provided with a white cigarette ash collecting tray, so that the cigarette ash characters of the cigars can be compared after the cigars are smoked, and more intuitive combustibility evaluation can be obtained.

This invention provides a method and system for producing vinyl acetate. [Solution] A method and system for producing vinyl acetate can use a combustion limit (FL) formula with improved efficiency at one or more locations in the vinyl acetate production process. In this invention, FL can be used in one or more of the four parts of the vinyl acetate production process: the reactor, the inter-process heat exchanger, the carbon dioxide removal system, and the ethylene recovery system. Such FL is a function of the operating state and includes at least one interaction term that represents the interrelationship of two or more operating states (e.g., temperature, pressure, and component concentration) with respect to FL.

The present invention discloses a combined quality improvement method for a flue gas modified wheat straw and lignite mixed fuel, comprising the following steps: uniformly mixing wheat straw powder and lignite powder to obtain a mixture, drying the mixture at 200-270°C for 25-30 minutes in a flue gas atmosphere, and cooling to room temperature to obtain a flue gas modified wheat straw and lignite mixed fuel. The fuel quality and physical properties of the flue gas modified wheat straw and lignite mixed fuel are improved. The combined quality improvement method can compensate for the loss of combustible components during the drying process, enhance the hydrophobicity of the flue gas modified wheat straw and lignite mixed fuel while improving the quality of the combined quality improved fuel, effectively improve the combined utilization value of lignite and wheat straw, significantly reduce the emission of NOx from the combustion product, and reduce pollution, effectively improve the utilization value of wheat straw and lignite, and achieve efficient energy saving and carbon reduction at the production capacity end.

The application discloses a construction method for isolating combustible gas risk in a pipeline and a structure thereof, and comprises the following steps: screening a blocked pipeline with hidden safety hazards on both sides of a construction position; customizing a flange blockage device according to the specification of the blocked pipeline at the construction position; sealing the pipeline on both sides of the construction position by the blockage device; reforming the pipeline passing through the construction position into a detection gas pipeline with safety gas; providing an inlet of safety gas at one end of the detection gas pipeline and connecting a gas discharge port of the pipeline at the other end for discharging the safety gas; continuously injecting the safety gas into the detection gas pipeline and keeping the gas in the detection gas pipeline in a slightly positive pressure state, meanwhile, opening a vent valve of the gas discharge port and detecting the safety gas concentration in real time at the position; judging the safety of the construction position according to the concentration standard value of the safety gas. In the case that there is no internal leakage of the valve or there is internal leakage of the valve, the safety hidden danger caused by production suspension, maintenance and modification can be solved by the isolation method.

An oxygen isolation device for preventing combustible rock and soil from spontaneously combusting, and a use method. At least two gas delivery hoses are provided on the upper surface of a combustible rock and soil accumulation body, the gas delivery hoses are spaced apart by a certain distance, and a plurality of through grooves are provided on the outer surface of each gas delivery hose, with the through grooves being distributed in the axial direction of the gas delivery hose. By means of providing the gas delivery hoses, a gas treatment device and a gas detection box, an inert gas enters the interior of the combustible rock and soil via the gas delivery hoses, and at the same time, the gas treatment device extracts gas from the interior of the combustible rock and soil, such that the inert gas quickly enters the interior of the combustible rock and soil, and the air is quickly expelled by the inert gas from the interior of the combustible rock and soil, thereby isolating the combustible rock and soil from the air and preventing the combustible rock and soil from spontaneously combusting.

The utility model discloses a power plant fuel management device which comprises a management box and further comprises a management assembly arranged in the management box and used for controlling and managing the surface temperature of pulverized coal fuel, the management assembly comprises a first multi-way pipe arranged on one side of the management box, and an air inlet pipe is arranged on the side, away from the management box, of the first multi-way pipe. An air heater is arranged at the end, away from the first multi-way pipe, of the air inlet pipe. Through the arrangement of the management assembly, pulverized coal fuel is preheated before entering the combustion furnace, so that management control over the surface temperature of the pulverized coal fuel is achieved, the preheated pulverized coal fuel can rapidly reach a stable combustion state after entering the combustion furnace, the flammability of the pulverized coal fuel is improved, and the combustion efficiency of the pulverized coal fuel is improved. And the loss of pulverized coal fuel in the combustion process is reduced, so that the fuel expenditure cost of a power plant is further reduced.

The invention discloses a compound liquid fertilizer for improving combustibility of cigar tobacco leaves as well as a preparation method and application of the compound liquid fertilizer. The compound liquid fertilizer comprises the following components by concentration: 11-12 g / L of zinc, 1.3-1.6 g / L of boron, 0.6-0.8 g / L of molybdenum, 3-4 g / L of brown algae essence, 3-4 g / L of alfalfa extract paste and 78-83 g / L of sugar alcohol chelated magnesium (based on magnesium). The high-efficiency compound liquid fertilizer is constructed by taking sugar alcohol chelated magnesium as a core and compounding trace elements such as zinc, boron and molybdenum as well as the brown algae essence and the alfalfa extract, the magnesium element can be stably released, the interference of side-effect ions is avoided, meanwhile, the potassium-chlorine ratio of tobacco leaves, carbon and nitrogen metabolism and soil micro-ecology are synergistically regulated and controlled, and the yield of the tobacco leaves is increased. Combustion components and physical structures of the tobacco leaves are optimized from the source, and finally the combustion quality of the cigar tobacco leaves is remarkably improved.

The utility model discloses a combustible gas detection device for chemical pipeline maintenance. The combustible gas detection device comprises a maintenance robot crawling in a pipeline, the maintenance robot comprises a crawling mechanism and a turning mechanism for driving the crawling mechanism to turn; the crawling mechanism comprises a center frame, and a plurality of crawling arm structures are installed on the center frame. The climbing arm structure comprises a climbing arm, a wheel arm is mounted on the climbing arm through a spring structure, and a climbing roller is mounted on the wheel arm; a crawling motor for driving the crawling roller is mounted on the crawling roller; the center part of the center frame is fixedly connected with a center seat, the turning mechanism comprises a turning rod fixedly mounted on the center seat, the turning rod is hinged with a hinge seat, and a turning motor for driving the turning rod to swing is mounted on the hinge seat; the hinge seat is fixedly provided with an anchor supporting structure, in the turning process, the anchor supporting structure is supported on the inner wall of the pipeline, and the turning motor drives the pipeline to turn. Crawling detection in the pipeline to be overhauled is achieved through the device, and the safety of overhauling operation is improved.

Whether the co-firing ratio is low or high, interlock control is appropriately implemented when the co-firing ratio fluctuates due to the influence of external disturbances. [Solution] This application relates to a gas turbine control device for controlling a gas turbine equipped with a fuel supply system that supplies a first mixed fuel of a first fuel and a second fuel to a first fuel nozzle. The gas turbine control device determines whether or not interlock control of the gas turbine is necessary by comparing the deviation between a target mixing ratio, which is a target value for the mixing ratio of the second fuel in the first mixed fuel, and the mixing ratio of the second fuel in the first mixed fuel, with a reference value. The reference value for determining whether interlock control is necessary differs between the first mixing ratio region, where the combustibility index of the first mixed fuel decreases with increasing mixing ratio, and the second mixing ratio region, where the combustibility index of the first mixed fuel increases with increasing mixing ratio.

The utility model discloses drum-type organic fertilizer fermentation equipment with a waste gas treatment function, which relates to the technical field of organic fertilizer fermentation and comprises a machine body, a second motor is fixedly mounted at one end of the machine body, a first bevel gear shaft is movably mounted at the output end of the second motor, and a waste gas purifier is fixedly mounted on one side of the machine body. And a second bevel gear shaft is movably mounted at one end of the waste gas purifier. Through the arrangement of the first bevel gear shaft, the second bevel gear shaft, the filter plate and the fan blades, waste gas is purified through the filter plate, and purified air is discharged into the fermentation tank under the action of negative pressure, so that the purpose of efficiently treating the waste gas is achieved, air pollution is reduced, potential safety hazards caused by possible generation of combustible gas are reduced, and the service life of the fermentation tank is prolonged. Meanwhile, a large amount of waste gas in the fermentation tank is prevented from being deposited, the gas fluidity in the tank is improved, the influence on the biological flora living environment is reduced, and the fermentation efficiency is improved.

The utility model discloses a furnace body structure and a magnesium alloy furnace mouth high-temperature sealing structure thereof, and relates to the technical field of magnesium alloy furnaces, and the magnesium alloy furnace mouth high-temperature sealing structure comprises a first isolation piece, a second isolation piece and a third isolation piece, the second isolation piece is used for being arranged along the inner periphery of the top of a furnace body panel of the magnesium alloy furnace in an attached mode; wherein the contact surface of the first isolation piece and the second isolation piece is a conical surface, and the first isolation piece and the second isolation piece are heat insulation material pieces without flammability. The device can solve the problems of fire leakage of a furnace mouth, failure of a steel structure, shutdown maintenance of the magnesium alloy furnace and the like caused by direct contact between high-temperature open fire in the magnesium alloy furnace and a furnace body panel made of a metal material.

The invention discloses a power fuel generation method for a sea-air amphibious environment, which comprises the following steps: generating fluidized metal fuel by utilizing the properties that methanol and aluminum do not react at a low temperature and methanol and aluminum particle surfaces react at a high temperature; the fluidized metal fuel is composed of methanol and aluminum particles at a low temperature or aluminum particles coated with methanol and aluminum methoxide films at a high temperature. The underwater power fuel is generated by using the violent hydrolysis property of aluminum methoxide and seawater and the self-ignition reaction property of metal aluminum and seawater; high-temperature water vapor is generated through combustion reaction of methanol and air; the generated high-temperature water vapor reacts with aluminum methoxide / aluminum to generate combustible gases such as hydrogen, and the combustible gases and air are combusted and react to generate low-altitude power fuel. The double roles of methanol are ingeniously utilized, and efficient, reliable and self-ignition power fuel on-demand generation and supply of a single fuel system in two different environments of underwater and low altitude are achieved.

This invention provides a method for producing reduced ilmenite, belonging to the field of solid-state reduced ilmenite technology. This invention uses a petroleum coke pot furnace to produce reduced ilmenite, utilizing the heat of the pot furnace to reduce carbon-containing titanium ore pellets. Simultaneously, the combustible gases generated by the titanium ore pellets continue to heat the flue, allowing the reduction process to continue without external heat. This method utilizes the low-cost, self-heating mechanism of a pot furnace for producing calcined coke to produce reduced ilmenite, reduced iron, or other carbothermally reducible metal oxides. The pelletizing formula and method used are significantly different from the traditional rotary kiln used for producing reduced ilmenite, facilitating operation within the pot furnace, increasing permeability, and enhancing the reduction effect. This invention not only reduces production costs but also improves the production method of reduced ilmenite.

The invention relates to the technical field of exhaust systems, in particular to a heat pump anti-explosion laboratory exhaust system which comprises an air source, a pressure reducing valve, an electromagnetic valve, a dilution exhaust hole and an air outlet exhaust hole, the air outlet end of the air source is connected with a main exhaust pipeline and a branch exhaust pipeline through the pressure reducing valve and the electromagnetic valve, and the main exhaust pipeline extends into a laboratory; the branch exhaust pipeline extends into the air inlet side of the exhaust fan, the dilution exhaust hole is formed in the main exhaust pipeline, and the air outlet exhaust hole is formed in the branch exhaust pipeline. The non-combustion-supporting gas source is arranged in the exhaust system, and gas injection operation is performed in the laboratory, so that the exhaust system can inject the non-combustion-supporting gas into the laboratory to dilute the content of the combustible gas in the laboratory while exhausting the combustible gas, and meanwhile, the non-combustion-supporting gas is guided into the air inlet side of the exhaust fan, so that the content of the combustible gas in the laboratory is reduced. Therefore, the concentration of the combustible gas discharged out of the room is sufficiently diluted, and the safety is further improved.

The invention discloses a flammability test device for a building energy-saving material, and relates to the technical field of combustion equipment, the flammability test device comprises a tank body and two air inlet channels arranged on the tank body and connected in a penetrating manner, and further comprises a combustion table, a combustion chamber, a combustion chamber and a combustion chamber, the sealing piece is slidably connected into the air inlet channel corresponding to the sealing piece and used for adjusting the opening degree of the air inlet channel; the transmission assembly is connected with the combustion table and the sealing piece; when the mass of the fuel drives the combustion table to move downwards, the transmission assembly is driven to move, the opening degree of the air inlet channel is adjusted through the sealing piece, and then the air inlet amount in the tank body is adjusted. The opening degree of the air inlet channel is adjusted according to the weight of combustible materials placed on the fuel table, then the volume of air entering the tank body is adjusted, and the air in the tank body can maintain sufficient combustion of the combustible materials.

The invention discloses a thermal management device and system and a vehicle with the system.The thermal management device comprises a compressor; the plate heat exchange assembly comprises a condenser and an evaporator, the plate heat exchange assembly and the compressor are arranged on the bottom plate in parallel, and the compressor is located on the same side of the condenser and the evaporator; wherein the thickness direction of the condenser is parallel to the thickness direction of the evaporator, the projection of the compressor in the thickness direction of the condenser covers the condenser, and the projection of the compressor covers part of the evaporator. According to the technical scheme, the plate exchange assembly and the compressor are arranged in parallel, so that the plate exchange assembly and the compressor are integrated into a whole, application of most external pipelines is reduced, the total volume of a refrigerant flow path is greatly reduced, the refrigerant filling amount needed by the whole heat management equipment is reduced, and the heat management efficiency is improved. And the safety requirement of the flammable refrigerant is met.

The invention belongs to the technical field of garbage resource utilization, and particularly relates to an organic garbage resource recycling device which comprises an electric heating box, the upper side of the electric heating box is fixedly connected with a waste heat processing box, garbage is spread out through a material turning plate, smooth feeding is guaranteed, the garbage is evenly heated, combustible gas is rapidly generated, and the waste heat processing box is used for processing waste heat. Then the gas enters a waste heat processing box, wet garbage is dried through heat of the gas, so that the gas is secondarily utilized, gas waste is prevented, when a motor drives a first connecting shaft to rotate, an elastic rope wound on the first connecting shaft is subjected to pay-off treatment, a movable plate is pushed under the action of the elasticity of a spring piece, and the movable plate is driven by the motor to rotate; and a turning plate on a second connecting shaft rotates to turn garbage accumulated on a first filter plate, so that the garbage can be prevented from blocking filter holes in the first filter plate, the garbage can be uniformly heated in the drying process, and the effect of drying the garbage through gas waste heat is optimized.

A burner includes a plate having an upstream end surface and a downstream end surface in an axial direction; at least one mixing flow path formed in the plate so as to extend in the axial direction between the upstream end surface and the downstream end surface and configured to supply air to the inside; a first cavity formed in the inside of the plate and configured to be supplied with a first fuel; a second cavity formed in the inside of the plate and configured to be supplied with a second fuel having a higher combustibility than the first fuel; at least one first injection port for injecting the first fuel from the first cavity into the inside of the at least one mixing flow path; and at least one second injection port for injecting the second fuel from the second cavity into the inside of the at least one mixing flow path, the second cavity being located at a position more downstream than the first cavity in the axial direction.

The invention relates to the field of quality improvement and modification of lignite, in particular to a method for modifying and drying lignite by adopting biomass pyrolysis gas. The method comprises the following steps: carrying out heat treatment on lignite in an inert atmosphere to obtain dried lignite; biomass is pyrolyzed, obtained pyrolysis gas and the dried lignite are subjected to heat and mass transfer, and modified lignite is obtained. According to the invention, tar in the biomass tail gas and a cracking product thereof form a water-blocking layer or a passivated hydrophilic group on the surface of lignite particles, and meanwhile, an aromatic hydrocarbon component can replace water in the lignite, so that the effect of drying and modifying the high-water-content lignite is achieved. According to the method, moisture removal, flammable component increment, hydrophilicity weakening and reactivity strengthening of the lignite can be synchronously achieved, the fuel quality of the dried lignite is further improved by improving the energy density and combustion reactivity of the dried lignite, and recycling of biomass tail gas waste heat is achieved.