12 results about "Brown coal" patented technology

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 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 present application provides a kind of lignite powder system, comprising: hot blast stove, settling tube, coal mill and dust collector, the side of hot blast stove is fixedly connected with combustor, the feed inlet of hot blast stove is connected with pneumatic feeding device, fire wall is arranged in the furnace cavity near the air outlet of hot blast stove, and the gap for airflow passing between fire wall and furnace cavity is left;The air inlet of settling tube is connected with the air outlet of hot blast stove, and baffle is arranged in the settling tube near the air outlet of settling tube, and the gap for airflow passing between baffle and the inner wall of settling tube is left;The coal mill is connected with the settling tube, and the air inlet of coal mill is connected with the air inlet of settling tube, and the air inlet of settling tube is connected with the air inlet of coal mill, and filter plate is connected on air inlet channel;The dust collector is connected with the coal mill, and the dust collector is connected with finished product bin.The present application solves the problem that hot flue gas carrying spark enters coal mill and easily causes deflagration, so that lignite powder system can be long-term, stable, efficient and safe production.

The present application relates to lignite drying technical field, propose a kind of vertical double-channel drying pipeline device and control method, the device includes vertically arranged drying pipeline shell, inside partition plate separates its into top intercommunicating uplink channel and downlink channel;Uplink channel bottom connects vertically extending pipeline, downlink channel bottom connects arc flow guide pipeline.The method is based on the principle of pressure difference inversion: obtain pipeline pressure difference by detection unit, utilize pre-calibrated pressure difference-flow relationship model to invert gas flow, and calculate material flow in combination with feeding frequency, and then real-time obtained gas-solid ratio;Control system generates multilevel control instruction according to gas-solid ratio, outlet moisture and pressure difference signal, carries out closed-loop regulation to fan and feeding device.The vertically arranged drying pipeline shell of the present application can avoid lignite accumulation, solve the problem of pipe accumulated coal powder spontaneous combustion in production process.

The application provides a lignite-based hard carbon negative electrode material preparation method and device. The scheme of the application is that lignite raw materials are subjected to pre-oxidation treatment in an oxygen-containing atmosphere through a pre-oxidation process; the pre-oxidation product of the coal is subjected to pre-carbonization treatment in an inert atmosphere through a pre-carbonization process; the pre-carbonization product is subjected to superfine crushing through a superfine crushing process; after the coal powder is subjected to acid washing treatment to remove impurities through an acid washing purification process, high-purity hard carbon negative electrode material is obtained; and through an intelligent control platform, cross-process parameter collaborative regulation is realized through an LSTM neural network and a full-link digital twin model. The application greatly improves the carbonization yield, the first coulomb efficiency of the hard carbon material, the 100-cycle capacity retention rate and the batch performance fluctuation and other key parameters, and provides an industrialization scheme for preparing high-performance battery negative electrode material from low-cost lignite.

The application 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: brown coal is added into a mixed solution of concentrated sulfuric acid and concentrated nitric acid, a first mixing reaction is carried out, ammonia water is used to adjust the pH to neutral, a second mixing reaction is carried out, and a coal sample is obtained; the coal sample is added into water to prepare a brown coal mixed solution, and then cavitation stripping treatment is carried out on the brown coal mixed solution, so that the coal-based red fluorescent carbon dots are obtained. The coal-based carbon dots with the red fluorescent characteristics are prepared, the common problem that the fluorescent colors of the coal-based carbon dots prepared by using the mainstream chemical oxidation stripping method are generally blue is solved, and a new technical path and solution are provided for expanding the fluorescent wavelength range of the coal-based carbon dots and enriching the polychromaticity of the coal-based carbon dots.

This invention belongs to the field of boiler technology and provides a 232MW large-capacity circulating fluidized bed hot water boiler. It includes a high-energy ignition device, a fully membrane-walled isobaric air chamber, a primary air chamber, an air distribution plate, a coal feeding device at the furnace front, a boiler ash removal device, a secondary air box, a furnace, a high-temperature insulated separator, risers, a return feeder, a diverting flue, a tail-end vertical flue, an economizer, an air preheater, and a compartmented outlet flue. The high-temperature insulated separator is a fully downward-sloping, stepless insulated separator; the return feeder is a dual-path return structure; the tubes of the economizer and air preheater form the tail-end heating surface, which is a high-heat-exchange, self-cleaning ash-removing tube array. This invention features more stable combustion, higher separation efficiency, low flue gas resistance, reliable operation, and significant energy-saving and wear-reducing effects. It can burn various fuels such as bituminous coal, lignite, and low-quality coal, making it suitable for large-scale centralized heating projects in northern China.

The present application provides a kind of with sintering desulfurization denitration activated carbon and blast furnace injection coal blending method of coking coal, it is related to blast furnace smelting technical field, including the following steps: obtaining the volatile content, fixed carbon content, ash content and sulfur content of original blast furnace injection mixed coal powder;Based on the volatile content, fixed carbon content, ash content and sulfur content of original blast furnace injection mixed coal powder, the proportion of coking coal and the proportion of sintering desulfurization denitration activated carbon are calculated;According to the calculated proportion of coking coal and sintering desulfurization denitration activated carbon, coking coal and sintering desulfurization denitration activated carbon are mixed with anthracite, bituminous coal, lean coal, lean and lean coal, lignite one or several, to obtain blast furnace injection mixed coal powder.The present application saves valuable coal resources, substantially reduces the cost of coal blending, and achieves the effect of rational utilization of these secondary heat and carbon resources.

The present application belongs to the field of drilling technology, and particularly relates to a drilling fluid suitable for super-deep coal seam gas well, which comprises the following components in parts by weight: water 100 parts, caustic soda 0.1-0.2 parts, asphalt material 4-6 parts, resin material 3-4 parts, lignite material 1-2 parts, salt-resistant soil 1-2 parts, superfine calcium 2-3 parts, filtration reducer 0.8-1.5 parts, film-forming solid wall agent 1-2 parts, ammonium salt inhibitor 1-1.5 parts, potassium chloride 5-7 parts, and organic salt 10-15 parts. The drilling fluid system is used in the drilling process, and has good rheological property, strong lubricity, strong inhibition and plugging capacity, and high temperature resistance up to 180 DEG C. In a high-temperature environment, the failure of the water-based drilling fluid leads to stable rheological property and filtration property, and meets the requirements of well wall anti-sloughing in the drilling of formations with developed fractures and low strength, and the requirements of drilling anti-sloughing in the super-deep coal seam gas well with alternating coal and mudstone formations.

This application provides a method for calculating the dew point of the pulverized coal outlet pipe in a positive pressure direct-fired pulverizing system that co-fires lignite. The method includes the following steps: determining the received moisture content of the lignite; calculating the pulverized coal moisture content based on the received moisture content of the lignite; calculating the humidity content of the air at the pulverizer outlet; calculating the dew point of the pulverized coal outlet pipe based on the humidity content of the air at the pulverizer outlet; and comparing the dew point of the pulverized coal outlet pipe with the pulverizer outlet temperature to generate a graded alarm. This application adjusts the pulverizer outlet temperature by calculating the dew point of the pulverized coal outlet pipe and comparing it with the pulverizer outlet temperature, thereby preventing pulverized coal pipe blockage and ensuring the safe operation of the pulverizer.

This invention belongs to the field of lignite drying technology and discloses a method for recovering and utilizing high-temperature coal powder in lignite drying production. High-temperature coal powder enters a closed-loop oxygen-barrier screw conveyor from the bottom of a cyclone dust collector. The screw blades inside the closed-loop oxygen-barrier screw conveyor rotate under the drive of an explosion-proof geared motor, moving the high-temperature coal powder towards the discharge port. The coal powder then enters a closed-loop humidifying mixer through a pipeline. Water sprayed from the spray pipes inside the humidifying mixer comes into contact with and mixes with the coal powder. Under the stirring of the mixer, the coal powder and water are fully mixed to form wet fine coal powder, which is then transported to the discharge port of the humidifying mixer. The wet fine coal powder falls from the discharge port onto a belt conveyor below the humidifying mixer and is transported to the finished product warehouse. This invention produces dust-free production, avoiding environmental pollution; the closed-loop oxygen-barrier screw conveyor improves production safety and realizes the recovery and utilization of high-temperature coal powder.

The application discloses a kind of coal gangue high-temperature calcination enhanced activation methods, including that coal gangue is broken and screened and iron removal operation is carried out to obtain coal gangue broken material, according to coal gangue broken material chemical composition adds lignite powder to obtain coal gangue calcining material, fitting three-stage calcining temperature model obtains calcining process temperature, determines each stage design calcining time to coal gangue calcining material is calcined, simultaneously according to calcining process temperature and calcining time dynamic control oxygen concentration completes calcining, using phase change medium to the rapid quenching of coal gangue calcining product, after coal gangue calcining product cooling carries out activity regulation and control to obtain coal gangue product.This method can solve the problem of uneven activity caused by raw material fluctuation, improve calcining efficiency and calcining product quality, to realize the industrialization, stabilization and high-end of coal gangue resource utilization provides reliable technical support.