94 results about "Oil shale" patented technology

The invention discloses a geothermal development oil shale and CO2 geological storage integrated method, which relates to the field of complex oil and gas reservoir development, and comprises the following steps: designing U-shaped well process parameters, enabling CO2 fluid to flow to a high-temperature geothermal reservoir through a descending section of a U-shaped well, injecting the CO2 fluid into the oil shale reservoir along an ascending section of a shaft after sufficient heat exchange, preheating the oil shale, and storing the CO2 fluid into a high-temperature geothermal reservoir through the descending section of the U-shaped well. Terrestrial heat extraction and utilization are realized; after the temperature of the oil shale layer rises to the target temperature, the oil shale layer is further heated through manual heating, and in-situ conversion development of the oil shale is achieved; after completion, produced CO2 is injected into the oil shale layer again through the U-shaped well, and collaborative development of CO2 geological storage, geothermal extraction and oil shale in-situ conversion is achieved. Geothermal energy is efficiently extracted through CO2 and used for oil shale in-situ pyrolysis, the extra manual heating cost needed by oil shale in-situ conversion is remarkably reduced, and the economic feasibility of a pure storage project and oil shale in-situ conversion development is improved.

The invention provides an oil shale supercritical CO2 fracturing and in-situ conversion integrated device and a working method, belongs to the technical field of oil shale exploitation, and realizes efficient cooperation of supercritical CO2 fracturing and in-situ conversion by integrating a CO2 liquefaction storage system, a fracturing heating system, a stratum simulation system and a data monitoring system. The device comprises a CO2 liquefying and storing system, a CO2 liquefying and storing system, a CO2 liquid storage system, a CO2 liquid storage system and a CO2 liquid storage system, the oil shale fracturing and heating system is used for fracturing the rock core under the simulated formation confining pressure condition and triggering the oil shale in-situ cracking reaction through medium-frequency heating; the oil shale fracturing model is used for simulating an underground fracturing environment and guiding crack propagation; the data monitoring system collects temperature and pressure parameters in real time to optimize process regulation and control. The fracturing process and the conversion process are innovatively coupled, the supercritical CO2 has the characteristics of a fracturing medium, a heat transfer carrier and a reaction medium, the energy utilization rate and the CO2 circulation efficiency are remarkably improved, and the oil shale recovery rate is increased.

The invention discloses an artificial geothermal reservoir construction and development method based on oil shale reverse oxidation, and belongs to the technical field of resource exploitation, the method comprises the following steps: reservoir well construction: arranging an injection well, an exploitation well and a heat recovery well in a target layer section; an initial high-temperature environment is formed through manual heating, so that the oil shale is pyrolyzed to generate fixed carbon; injecting air to form an oxygen-enriched environment, initiating a fixed carbon oxidation self-heating reaction, and continuously pyrolyzing the oil shale; terrestrial heat is exploited through a circulating working medium, the air flow and components are dynamically controlled, and temperature control and safe operation are achieved; and finally reinjecting and sealing the carbon dioxide. The device can convert low-grade oil shale into clean geothermal energy, and has the advantages of energy conservation and environmental protection.

The invention discloses oil shale waste / fly ash glass ceramics as well as a preparation method and application thereof, relates to the technical field of glass ceramics, and solves the problems that in the prior art, OSA post-treatment is serious in environmental harm and low in resource utilization rate, and when OSA is applied to glass ceramics preparation, the crystal phase structure is unstable, the process controllability is poor, and the production cost is high. And high quality, low cost and sustainable utilization of the microcrystalline glass are difficult to realize at the same time. The oil shale waste / fly ash glass ceramic is prepared from 80 parts of industrial waste residues, 4-6 parts of nucleating agent and 14-16 parts of auxiliary components, the industrial waste residue is composed of 50-75 parts of oil shale residue and 5-30 parts of fly ash; the preparation method comprises the following steps: mixing the oil shale waste with the fly ash, adding the nucleating agent and the auxiliary components, grinding, melting, preserving heat, pouring the melt into a mold, and annealing to obtain base glass; and carrying out polishing treatment and heat treatment on the base glass to obtain the microcrystalline glass. The invention can be applied to the fields of building decoration and electrical insulating materials.

The application discloses a catalytic combustion heater principle prototype, which comprises an air tank, a methane tank, a mixed gas tank and a combustion chamber, the air tank is connected with the mixed gas tank through a connecting pipeline, the gas outlet of the mixed gas tank is connected with the methane tank and the combustion chamber through two connecting pipelines respectively, the top of the combustion chamber is provided with a mixed gas inlet, and a blower is arranged outside the combustion chamber, the application simulates the operation state of the underground catalytic combustion heater, high-temperature tail gas released by catalytic combustion mixed gas is used for heating oil shale layers, so that the oil shale is pyrolyzed to obtain the purpose of exploiting oil and gas, the simulation reference result of the experimental prototype can be understood as the actual operation result, the application not only reduces the exploitation cost of the oil shale in-situ conversion exploitation, but also improves the oil and gas exploitation efficiency, reduces the exploitation cost and reduces the harm of the toxic tail gas generated by incomplete combustion to animals, plants and the environment caused by direct release of the toxic tail gas into the atmosphere.

The invention discloses an oil shale in-situ conversion and carbon sequestration method by injecting high-temperature carbon dioxide and cooperating with sodium capsules, and belongs to the technical field of fossil energy in-situ exploitation and carbon sequestration. The method comprises the following steps: firstly, determining a target development area and formulating a corresponding development strategy; then, the oil shale reservoir is subjected to fracturing transformation; then, the oil shale reservoir is heated, supercritical carbon dioxide is injected, and displacement recovery is conducted; then, sodium capsule suspension fluid is injected into the oil shale reservoir, and solid-phase geological storage is achieved; and finally, after oil and gas exploitation reaches the economic limit, all the injection wells and the production wells are closed, and final geological storage is completed. According to the method, the carbon dioxide geological sequestration technology and the oil shale in-situ conversion process are deeply fused, the oil shale recovery efficiency is remarkably improved, the geological sequestration of the carbon dioxide is synchronously achieved, and the method has important significance in the fields of carbon emission reduction and fossil energy in-situ exploitation.

The invention relates to a desulfurization method of oil shale residues, which comprises the following steps: step 1, crushing the oil shale residues at room temperature, and then carrying out ball milling on the oil shale residues in a ball mill to obtain refined particles; 2, carrying out heat preservation and desulfurization on the refined particles in a muffle furnace; 3, the desulfurized refined particles obtained in the step 2 are soaked in an alkaline solution, then neutralized with an acid solution and finally washed repeatedly with clear water; and 4, drying the refined particles obtained in the step 3. The desulfurization method provided by the invention can effectively reduce the content of sulfur element in the oil shale residues and reduce the harm of the oil shale residues to the environment; the invention further provides cement mortar prepared from the oil shale residues prepared by the desulfurization method, the cement mortar is higher in compressive strength and flexural strength, lower in porosity, higher in density and higher in applicability, the production cost is saved, and the environment-friendly concept of recycling solid waste is met.

The application provides a wellbore safety experiment device and method for electric heating in-situ exploitation of oil shale, and the wellbore safety experiment device comprises a thermal insulation layer, a simulated injection-production assembly arranged outside the thermal insulation layer, and oil shale raw rock, a simulated wellbore assembly, a simulated production pipe column assembly and a first stress collection assembly arranged in the thermal insulation layer. The sealed cavity is heated by an electric heater, heat is transmitted to the oil shale raw rock through the oil pipe, the casing and the closed wellbore, the cracked product of the oil shale raw rock after being heated and cracked flows into the oil pipe through the product channel, the cracked product in the oil pipe is collected through the simulated injection-production assembly, the temperature in the oil pipe is collected through the first temperature sensor, the stress borne by the casing and the oil pipe at different positions is collected in real time through the first stress collection assembly, the real downhole in-situ exploitation process is simulated, the safety of the casing and the oil pipe can be evaluated in advance before downhole exploitation, and the safety and reliability of the casing and the oil pipe during downhole exploitation can be ensured.

The invention relates to a polymer composite material, which contains polymer from 10 to 99 % by weight and residual material remaining from the production of chalk from oil shale ash deposited on the hill from 1 to 90% by weight. Preferably, the residual material left over from the production of chalk from oil shale ash deposited on the hill is pre-ground and the particle diameter is less than 15 μm, preferably 97% of the particle diameter is up to 8 μm.

This invention relates to the field of inorganic non-metallic adsorbent technology, specifically an oil shale slag nanocomposite adsorbent, its preparation method, and its application. It addresses the problems of low controllability, poor stability, poor adsorption effect, poor repeatability, and short cycle life associated with the application of oil shale slag as an adsorbent. The invention involves dispersing oil shale slag powder in a sodium silicate nonahydrate aqueous solution, stirring, and ultrasonicating to obtain suspension 1. A manganese sulfate aqueous solution is added to suspension 1 to obtain suspension 2. Suspension 2 undergoes a hydrothermal reaction, and the reaction product is centrifuged until the pH is neutral. The product is then dried, ground, and sieved to obtain the oil shale slag nanocomposite adsorbent, which can be applied to the adsorption of organic dyes. This invention significantly improves the reactivity, removal capacity, and adsorption stability of the oil shale slag nanocomposite adsorbent for organic pollutants, exhibiting excellent repeatability and cycle life, providing an economical, environmentally friendly, and sustainable solution for water treatment and solid waste management.

The invention relates to the field of oilfield chemistry, and discloses a method for pyrolyzing oil shale. The method comprises the following steps: performing first mixing on oil shale, nano copper oxide and chromium trichloride, and performing pyrolysis under the condition of not lower than 300 DEG C; wherein relative to 100g of the oil shale, the dosage of the nano copper oxide is 8 to 30g; the mass ratio of the chromium trichloride to the nano copper oxide is 1: (4-25). The oil shale can be efficiently pyrolyzed into n-alkanes and aromatic hydrocarbons with long and short chains and few branched chains, soluble organic matters and gases are obtained, and oil gas can be obviously discharged from the ground more easily.

The invention provides a solid waste-based cementing material as well as a preparation method and application thereof, and relates to the technical field of building materials. The solid waste-based cementing material comprises the following components in parts by weight: 35-45 parts of slag, 25-35 parts of modified oil shale residues, 15-25 parts of desulfurized gypsum and 1-12 parts of a modifier, wherein the modifying agent is prepared from calcium hydroxide and high belite sulphoaluminate cement. According to the solid waste-based cementing material, on the premise of ensuring that the solid waste-based cementing material has high strength in the early stage and the later stage, the setting time of the solid waste-based cementing material can be regulated and controlled according to actual engineering requirements. Meanwhile, main raw materials adopted by the invention are all industrial solid wastes, the industrial solid wastes can be stably utilized in a large proportion, efficient utilization of industrial solid waste resources is achieved, the P.O 42.5 cement strength standard can be reached only by doping a small amount of performance modifier, the production cost is remarkably reduced, and the environmental pressure is reduced.

The utility model relates to the technical field of petroleum shale gas drills, and discloses a sand-prevention hand-hydraulic dual-drive plug valve for fracturing, which comprises a plug valve, a hydraulic driver, a hand wheel, a gasket, a screw, a bolt and a nut, and is characterized in that the plug valve is connected with the hydraulic driver through the bolt, the nut is in threaded connection with the outer surface of the bolt, and the hand wheel is arranged on the hand wheel. The plug valve and the hydraulic driver are in transmission through a flat key, a copper ring is installed between the hand wheel and the hydraulic driver, and the gasket is installed at the top end of the hand wheel through a screw. According to the sand-prevention hand-hydraulic dual-drive plug valve for fracturing, the hydraulic drive mode and the manual drive mode can be achieved, remote drive and emergency drive are achieved, the plug valve of a floating type sand-prevention structure is adopted, good erosion resistance and scouring resistance are achieved, the plug valve is particularly suitable for high-flow occasions for fracturing, and sand can be effectively prevented from entering a valve cavity; the valve cover, the plug cock, the plug cock arc piece and the like are all uniquely designed, the requirement for on-site maintenance and replacement can be met conveniently, and the production efficiency is improved.

The invention provides a liquid catalyst system for in-situ conversion of oil shale as well as a preparation method and application of the liquid catalyst system. The preparation method of the liquid catalyst system comprises the following steps: (1) heating a transition metal salt I aqueous solution to a reaction temperature, and then adding a sodium hydroxide aqueous solution for reaction; after the reaction is completed, centrifuging and washing to obtain transition metal hydroxide; (2) mixing organic acid with the transition metal hydroxide obtained in the step (1), and reacting; after the reaction is finished, separating liquid, washing and drying to obtain a liquid catalyst; and (3) mixing the liquid catalyst with the transition metal salt II, and uniformly stirring to obtain the catalyst. The liquid catalyst system has excellent hydrophilicity and lipophilicity, is high in diffusivity in oil shale, can penetrate into the oil shale, improves the mass transfer efficiency, remarkably reduces the pyrolysis temperature, effectively improves the oil and gas recovery rate, and has important significance in promoting the in-situ conversion industrial application of the oil shale.

The utility model discloses a circulating fluidized bed boiler oil shale combustion waste heat recycling device which comprises a recycling box, a spherical shell is arranged in the middle of the interior of the recycling box, and a spherical inner container is arranged in the middle of the interior of the spherical shell. A mounting rod is fixed to the middle of the top of the spherical inner container and the middle of the top of the spherical shell, a bearing seat is mounted on the outer wall of the mounting rod, and scraping plates distributed at equal intervals are fixed to the outer wall of the bearing seat; according to the oil shale combustion waste heat recycling device of the circulating fluidized bed boiler, heat exchange can be more sufficiently conducted between tail gas and the spherical shell and the spherical inner container, heat is better conducted to water in the recycling box, the waste heat recycling efficiency is improved, effective recycling of tail gas waste heat generated by oil shale combustion of the circulating fluidized bed boiler is achieved, and the energy consumption is reduced. Part of tail gas can push the scraping plate to rotate, impurities and waste residues attached to the inner wall of the spherical shell and the outer wall of the spherical inner container are removed in time, and impurity accumulation is prevented.

The invention discloses an oil shale waste nano-composite adsorbent as well as a preparation method and application thereof, relates to the technical field of inorganic non-metal adsorbents, and solves the problems of low controllability, poor stability, poor adsorption effect, poor repeatability and short cycle service life when oil shale waste is applied to the field of adsorbents. The preparation method comprises the following steps: dispersing oil shale waste powder in a sodium silicate nonahydrate aqueous solution, stirring and performing ultrasonic treatment to obtain a suspension 1; adding a manganese sulfate aqueous solution into the turbid liquid 1 to obtain turbid liquid 2; carrying out hydrothermal reaction on the suspension 2, and centrifuging a reaction product until the pH is neutral; and drying, grinding and sieving to obtain the oil shale waste nano-composite adsorbent which can be applied to adsorption of organic dyes. The reaction activity, the removal capacity and the adsorption stability of the oil shale waste nano-composite adsorbent on organic pollutants are remarkably improved, the oil shale waste nano-composite adsorbent has excellent repeatability and cycle service life, and an economic, environment-friendly and sustainable solution is provided for water treatment and solid waste management.

The invention discloses an oil shale waste residue microwave activation and microorganism coupling soil improvement method which comprises the following steps: crushing and screening oil shale dry distillation residues, and adding ground phosphate rock when necessary; then carrying out two-stage microwave activation treatment to obtain an activated waste residue carrier with high specific surface area and low content of harmful substances; mixing the activated carrier with a compound microbial agent (containing azotobacter chroococcum, silicate bacteria and cellulose degrading bacteria) and straws according to a specific ratio, and carrying out stack retting to prepare a harmless activated waste residue modifier; finally, the application amount is determined according to the soil type, and the fertilizer is applied to soil. According to the invention, harmlessness and high-value recycling of the oil shale waste residues are realized, and the prepared modifier can significantly increase the soil nutrient content, improve the soil structure, adjust the pH value and promote crop growth, is suitable for improvement of various degraded soil, has the advantages of efficient process, low cost, environmental friendliness and the like, and has a relatively high popularization value.

This invention belongs to the field of road engineering and industrial solid waste resource utilization technology, and particularly relates to a construction method for heavy-duty roads in mining areas based on solid-oil toughened oil shale waste residue. The method involves constructing, from bottom to top, an existing layer treatment layer, a first bonding layer, a high-toughness surface layer, a second bonding layer, and a solid-oil toughened oil shale waste residue overlay layer on the existing road layer in the mining area. After crushing, screening, and drying, the oil shale waste residue undergoes surface modification using a silane coupling agent hydrolysate, and is then mixed with toughening oil components and dried to obtain solid-oil toughened oil shale waste residue. This overlay layer is then mixed with aggregates, fillers, and cementing materials, and spread and compacted to form the overlay layer. The existing layer treatment layer improves the base condition through defect repair and interface treatment. The two bonding layers enhance interlayer bonding, and the high-toughness surface layer improves structural toughness and stress dispersion capacity. This method significantly improves the load-bearing capacity, rutting resistance, fatigue cracking resistance, and interlayer stability of heavy-duty roads in mining areas, achieving efficient resource utilization of oil shale waste residue.

The utility model discloses a resistance and friction reducing device for tight oil shale oil exploitation well drilling, which comprises a leveling assembly, the leveling assembly comprises a drill rod, a combined frame is arranged at one end of the drill rod, the combined frame is of a split type design, a plurality of groups of fixed supports are arranged on the outer wall of the combined frame and are respectively arranged on two sides of the combined frame, and the fixed supports are arranged on the outer wall of the combined frame. A screw hole is formed in the fixing support, a gasket is arranged on one side of the fixing support, an open hole matched with the screw hole is formed in the center of the gasket, a plurality of sets of installation frames are symmetrically installed on the outer walls of the two sides of the combined frame respectively, a speed adjusting motor is arranged on the outer wall of one side of each installation frame, and one end of each speed adjusting motor is connected with a transmission shaft. A crushing roller is installed at one end of the transmission shaft, an adjusting assembly used for adjusting the bending angle is arranged at one end of the drill rod, a lubricating assembly used for reducing resistance is arranged on one side of the combined frame, the adjusting assembly comprises an upper sleeve, and a supporting frame is installed at the bottom end of the upper sleeve.

The present application relates to the technical field of degradable agricultural mulching film, and particularly discloses a black biodegradable weeding mulching film and a preparation method thereof. The black biodegradable weeding mulching film is prepared by using biodegradable resin as a base material, replacing traditional carbon black with oil shale semi-coke as a core black functional filler, and compounding plasticizers, nucleating agents, antioxidants and other additives, and then through raw material pretreatment, mixed modification, melt blending, granulation and blow molding. The oil shale semi-coke contains carbon black components and inorganic minerals such as quartz and illite, which can not only endow the mulching film with excellent light-shielding and weeding performance, but also improve the mechanical strength and controllable degradation of the mulching film. Meanwhile, the oil shale semi-coke realizes the resource utilization of industrial solid waste and reduces the production cost of the biodegradable mulching film. The preparation process of the present application is compatible with the existing mulching film production line, is suitable for large-scale production, and has environmental protection value, economic value and agricultural application value.

The invention provides an oil shale electric heating in-situ conversion simulation device and method, the simulation device comprises a model container and a simulation oil shale rock mass placed in the model container, and the gap between the simulation oil shale rock mass and the model container is filled with epoxy resin; at least one simulated heating well and at least one simulated production well are longitudinally drilled in the simulated oil shale body, and temperature sensors and pressure sensors are distributed at multiple points around the simulated heating well; and the simulated production well is connected with a gas-liquid collecting device. The simulation method comprises the following steps: (1) applying confining pressure to a simulated oil shale body in the simulation device; (2) electrically heating the simulated oil shale body in the simulation device; and (3) carrying out sampling operation on the simulation device by adopting a gas-liquid collection device, and respectively and quantitatively calculating the produced oil-gas components and the output. According to the simulation device provided by the invention, the utilization efficiency of electric heating energy is improved, and an efficient, economical and feasible energy input speed can be formulated according to the utilization efficiency.

The invention belongs to the technical field of coal chemical industry, oil shale and biomass pyrolysis, and particularly relates to a high-temperature flue gas heat tracing structure of a raw gas dust removal device, which is characterized by comprising a masonry structure layer, a high-temperature flue gas heat tracing layer and a heat insulation layer, the masonry structure layer is arranged on the innermost side of the structure to replace the original outer wall of the dust removal device, and the high-temperature flue gas heat tracing layer is arranged on the heat insulation layer. The heat insulation and preservation layer is arranged on the outer side of the masonry structure layer, the high-temperature flue gas heat tracing layer is arranged between the heat insulation and preservation layer and the masonry structure layer, a channel of high-temperature heat tracing flue gas is formed in the high-temperature flue gas heat tracing layer, and the temperature of the high-temperature heat tracing flue gas is not lower than the temperature of raw coke oven gas in the raw coke oven gas dust removal device; the heat insulation layer is composed of a structure supporting body, a heat insulation layer and a metal isolation layer, and the metal isolation layer is a heat-resistant thin steel plate. The outer wall has the beneficial effects that high-temperature flue gas is prevented from entering the dust removal device to generate adverse effects on raw coke oven gas components, and compared with the outer wall of the conventional dust removal device with a heat-resistant steel structure, the manufacturing cost of the dust removal device can be greatly reduced.

The utility model relates to a self-aligning dynamic and static ring sealing device for a rotary kiln. The self-aligning dynamic and static ring sealing device comprises a dynamic and static ring sealing structure and an aligning pressing assembly, the dynamic and static ring sealing structure is composed of a dynamic ring, a static ring, an axial sealing ring and an end face sealing ring. The axial sealing ring is an inflation and deflation sealing ring; the multiple sets of aligning and pressing assemblies are arranged in the circumferential direction of the static ring, and each set of aligning and pressing assembly is composed of a corrugated pipe, an actuator, a connecting rod and a fixing plate. The rotary kiln end sealing device is suitable for sealing the end of a rotary kiln in the coal pyrolysis or oil shale upgrading process, the structure is simple and reliable, the sealing effect is good, and gas leakage in the kiln can be avoided when a kiln body of a large rotary kiln moves axially.

The application relates to the technical field of oil field development, in particular to a preparation method and application of a composite catalyst for in-situ catalytic pyrolysis of oil shale. The preparation method of the composite catalyst for in-situ catalytic pyrolysis of oil shale comprises the following steps: step one, a certain amount of 3-mercapto propyl trimethoxysilane and ZMS-5 are weighed and placed in toluene, refluxed at 110 DEG C for 12 hours, cooled, filtered, oxidized at normal temperature for 12 hours by using a certain amount of 30% H2O2, reacted at normal temperature for 12 hours by using a certain amount of 0.5 mol / L H2SO4, cleaned by using distilled water, filtered, placed in a drying box, dried at 110 DEG C for 6 hours, and sulfonated modified ZSM-5 is obtained; step two, active ingredients, 0.1wt%-25wt% Mo salt and 0.1wt%-25wt% W salt, are dissolved in deionized water according to a proportion, stirred and dissolved to form a solution; and step three, the composite catalyst is prepared by using an impregnation and calcination method.

The present application is suitable for the technical field of oil shale pyrolysis exploitation, and provides an oil shale pyrolysis state recognition method based on deep learning, which comprises the following steps: collecting the gas data of oil shale in the heating and cracking process at 5 DEG C / min by using a gas sensor electronic nose; performing data cleaning and normalization processing on the data collected by the sensor; dividing the training set, the verification set and the test set by using the gas sensor data; windowing the data, extracting the time sequence features, completing the feature extraction module; and training to obtain a network model based on deep learning. By increasing data cleaning, data normalization and data windowing, the feature engineering effect of the sensor data is improved, the GCN is selected to extract the relationship between the sensors according to the features of the gas sensor array, the LSTM is selected to extract the time sequence features of the reaction according to the oil shale pyrolysis reaction process, and finally the MLP module is used to output the predicted pyrolysis state and the accurate maturity.

The invention relates to the technical field of oil shale retorts, and discloses a smooth retort double-arch-abutment graded gas and material distribution structure which comprises an outer furnace body, an inner furnace body is fixedly connected to the inner wall of the outer furnace body, a feeding pipe is connected to the top of the inner wall of the inner furnace body in a penetrating mode, and the outer wall of the feeding pipe is fixedly connected with the inner wall of the outer furnace body. High-temperature gas is conveyed into the second gas inlet pipe, the falling oil shale is dispersed through the material distributing assembly, the oil shale with the small size is rearranged multiple times in the falling process, meanwhile, the high-temperature gas in the second gas inlet pipe enters the lower arch abutment, and finally the high-temperature gas is sprayed out through the multiple staggered gas distribution holes. The contact area of high-temperature gas and the oil shale is greatly increased, the high-temperature gas makes full contact with the falling oil shale, materials are evenly distributed in cooperation with the porous inverted-V-shaped plate, the oil shale at different positions and with different granularities is evenly heated, and the problem that due to the fact that the temperature rise difference is large in the oil shale falling process, oil shale dry distillation is insufficient is solved.

The invention belongs to the technical field of coal chemical industry, oil shale and biomass pyrolysis, and particularly relates to a medium-temperature flue gas heat tracing structure of a raw gas dust removal device, which is characterized by comprising an inner heat insulation layer and an outer heat insulation layer, a medium-temperature flue gas channel is arranged between the outer heat insulation and heat preservation layer and the inner heat insulation and heat preservation layer, and medium-temperature flue gas in the medium-temperature flue gas channel is steam or hot flue gas with the temperature of 110-300 DEG C; the inner heat insulation layer is arranged on the innermost side of the structure; the inner heat insulation layer and the outer heat insulation layer are respectively composed of a structure supporting body close to the outer side, a middle heat insulation layer and a metal isolation layer close to the inner side, the metal isolation layer of the inner heat insulation layer is a heat-resistant thin steel plate, and the structure supporting body is composed of a plain carbon steel plate and a profile frame. The heat tracing structure has the beneficial effects that a heat-resistant steel structure selected in a conventional high-temperature flue gas heat tracing environment is replaced by a low-cost structure, and the manufacturing cost of the heat tracing structure of the dust removal device is reduced.

An airflow pulverizing device for oil shale dry distillation waste includes a classification chamber, a pulverizing chamber, and a discharge pipe. The classification chamber contains a classification impeller with an open upper end connected to an exhaust pipe. Multiple nozzles for injecting high-pressure airflow into the pulverizing chamber are arranged in a circumferential array on the sidewall of the pulverizing chamber. The nozzle trajectories converge in the center of the pulverizing chamber to form a pulverizing zone. A guide ring is located below the classification impeller inside the classification chamber. The top surface of the guide ring has an annular groove that fits against the inner wall of the classification chamber. A guide channel extends inward from the guide ring, inclined downwards, and multiple guide channels are arranged in a circumferential array. The guide channels communicate with the annular grooves, and their ends are located above the pulverizing zone of the pulverizing chamber. This design effectively reduces the amount of residue falling into the discharge pipe, thereby reducing the frequency of residue collection and refeeding, and simplifying management processes and workload during pulverization.

The application discloses an oil shale semi-coke / red phosphorus / DOPO flame retardant. In the flame retardant, DOPO is grafted on the surfaces of oil shale semi-coke and red phosphorus, the mass percentage of DOPO grafted on the surfaces of oil shale semi-coke and red phosphorus is 3%-5% of the total mass of oil shale semi-coke and red phosphorus, and the mass ratio of oil shale semi-coke to red phosphorus is 5:1-25:1. Compared with the prior art, the flame retardant can not only realize resource recycling of oil shale semi-coke waste, but also has the characteristics of high flame retardation and low smoke generation.

The invention provides an alkali modified oil shale filler and a preparation method and application thereof, and the preparation method comprises the following steps: uniformly mixing oil shale and an alkali modified solution to form a mixed solution; oscillating the mixed solution in a water bath, so that the oil shale is in full contact with the alkali modification solution for modification; and washing the modified material, and drying to obtain the alkali modified oil shale filler. The adopted raw materials are easy to obtain and low in price, and the preparation method is simple, rapid, low in energy consumption, short in period and easy for mass production; through alkali modification, the denitrification effect of the filler is obviously improved, and the filler can be widely applied to ecological water treatment facilities such as biological filters, constructed wetlands and ditches and ponds.