1251 results about "Coal dust" patented technology

A process method of coking coal dust forming chiefly aims at settling the problem about a second dust emission in the course of transportation. First, the large quantity of small smut produced by a fluidized bed can be collected by a dust precipitator, be conveyed to a smut collecting storehouse, and constantly transmitted into a high pressure molding machine by an incessant closed conveyer. The feeding mouth of the high pressure molding machine is provided with a repressing screw to ensure the smut entering a high pressure rolling pair to be with certain pressure. Then the smut can be extruded into effigurate briquette, which at last is conveyed into a production coal conveying system after the molding. The process can prevent the production coal from producing the second dust emission during the transportation, thus reducing the engineering investment and environmental pollution with the advantages of less floor space and increasing the coke yield produced by coke oven.

The invention relates to a coal-fired power plant coal dust prepared activated coke flue gas comprehensive purification system and a technology. The technology provided by the invention comprises the following steps of: using coal dust in a coal-fired power plant as a raw material, simultaneously carrying out carbonization and activation on coal dust in an activated coke preparation reactor to obtain powdered activated coke, using pyrolysis gas obtained during the preparation process as reburning fuel and sending it into a boiler so as to remove part of NOx; sending the powdered activated coke into a flue gas adsorption tower, adsorbing pollutants such as sulfur dioxide, mercury and the like at an appropriate temperature, injecting ammonia gas and nitrogen oxide to perform a catalytic reduction reaction so as to remove nitrogen oxide; reusing the adsorbed activated coke after regeneration; sending the activated coke into the boiler for combustion after multiple adsorption/regeneration; regenerating the activated coke after adsorbing sulfur dioxide to obtain high-density sulfur dioxide gas to realize resource utilization. By the utilization of coal resources in a coal-fired power plant, the comprehensive purification of flue gas and the resource utilization of sulfur dioxide are realized without discharge of waste water, exhaust gas and solid waste.

The invention provides a metallurgical composite pelletizing prepared through a twice pelletizing method, as well as a preparation method and an application thereof. The pelletizing is provided with a pelletizing shell formed by a central pelletizing core and a pellet material coating the outside of the pelletizing core. The internal pelletizing core of the formed pelletizing is in a reducing atmosphere, the outside of the formed pelletizing is in an oxidizing atmosphere, and the metallurgical composite pelletizing undergoing twice pelletizing satisfies the metallurgical requirements. The pelletizing core takes an iron-containing material and reducing coal dust or coke powder as raw materials in which adhesive and waste fly dust are added, and is obtained by means of disk pelletization or pressure pelletization. The pelletizing shell takes the iron-containing material and the pelletizing core as raw materials in which the adhesive is added, and is obtained by means of disk pelletization and taking the pelletizing core as the center of the sphere. Various metallurgical performance indexes of the composite pelletizing are highly better than normal pellets. The composite pelletizing not only realizes the harmlessness and the recycling of the waste fly ash, but also can greatly improve the technical and economic indexes of iron making blast furnaces. In addition, the composite pelletizing not only achieves such social benefits as energy conservation, emission reduction, environment protection and environment pollution treatment, but also can create considerable economic benefits.

The invention relates to coal mining equipment and specially, relates to a high-efficiency blocking coal shovel. The high-efficiency blocking coal shovel comprises a shovel body. The shovel body comprises a frame. The high-efficiency blocking coal shovel also comprises an impulsion shovel mechanism. The impulsion shovel mechanism comprises a shovel head and an impulsion device. The shovel head comprises shovel teeth and a fixing part. The shovel teeth are installed on the fixing part. A rear part of the fixing part is provided with an impulsion stroke guiding mechanism. The impulsion stroke guiding mechanism is sildingly connected to a guiding sleeve. The guiding sleeve is arranged on the impulsion device and/or the frame. The impulsion device impacts the impulsion stroke guiding mechanism. Only through one impulsion process, the shovel head can complete both coal falling and surface cleaning. The impulsion shovel mechanism is arranged on the shovel body. The shovel body drives the whole high-efficiency blocking coal shovel to walk. Coal mined by the high-efficiency blocking coal shovel is not broken fully. The high-efficiency blocking coal shovel has a high blocking rate and low power consumption, produces a small quantity of coal dust, provides a good work environment, realizes continuous coal mining, synchronously completes both coal falling and surface cleaning, and saves a mass of energy.

The present invention discloses a radial gradation double air regulation cyclone coal powder burner, including nozzle with burner, internal first air channel, external first air channel, internal second air channel, external second air channel, internal tooth profile combustion-stabilizing ring, external tooth profile combustion-stabilizing ring, double-cone flare, stopper coal powder concentrator and central pipe cyclone coal powder burner. It utilizes two air channels to implement radial gradation combustion.

The invention relates to a coal direct liquefaction method. It includes the following steps: mixing coal slurry which is made up of coal dust, hydrogenation cycle solvent, and iron catalyst with freshness or cycle hydrogen; reacting by the first and second reactor; sending the product from the second reactor to high temperature separator to separate; the weight flow ratio of the recycle and freshness materials is 2-20. The method can reduce hydrogen consumption and gas yield.

The invention provides a combined type multi-injector burner with a flammable powder body, which comprises an igniter burner positioned at the center of the burner and a plurality of process combustion nozzles which are evenly formed on the periphery of the igniter burner in the circumferential direction, wherein, each process combustion nozzle comprises a coal dust passage positioned at the center of each process combustion nozzle and a first annular oxidizer passage arranged outside the coal dust passage. In the combined type multi-injector burner, a plurality of process combustion nozzles and the igniter burner are assembled together, the structure is compact, and the combustion efficiency as well as the gasification efficiency are increased; the maintenance of each single process combustion nozzle is flexible, and the disassembly and the assembly are convenient; the process combustion nozzles can limberly adjust the load of the burner, mediums in a hearth can be mixed evenly through repeated impacts, the flame fullness degree is good, and a uniform multilayer cooling structure can protect the burner effectively and prolong the service life of the burner.

The invention discloses a method for calculating thermal efficiency of a coal dust and blast furnace gas co-combustion boiler. The method is designed against the problem that in configuration in the prior art, boilers of storage type coal pulverizing systems cannot accurately obtain the boiler inlet coal quantity under the corresponding working conditions when the thermal efficiency of the boilers is calculated. The method for calculating the thermal efficiency comprises the steps of collection and measurement of relevant parameters, fire coal combustion calculation, gas combustion calculation, boiler inlet quantity calculation, boiler inlet coal quantity calculation, input heat calculation, calculation of various heat losses and thermal efficiency calculation of the boiler. According to the method, the thermal efficiency calculation of the boiler is performed by accurately calculating the boiler inlet coal quantity, main adverse factors influencing the boiler thermal efficiency are found out by analyzing boiler thermal efficiency calculation results, guidance is provided for modification and optimized running of the boiler, and the goal of energy saving and consumption reduction is achieved.

The invention relates to a method for simultaneously producing liquid fuel and asphalt paving materials by coprocessing coal and heavy oil. The method comprises the following steps: mixing coal dust, catalyst and heavy oil to prepare pulp; preheating and entering a reactor to carry out reaction; separating reaction products to separate gaseous substance, light oil, water and heavy mixture; extracting hydrogen from the separated gaseous substance through pressure swing adsorption; returning the purified hydrogen to the reactor to be used circularly, and using the remaining gas as fuel after purification; carrying out oil-water separation on the separated light oil and water to obtain the light oil and the water; leading the heavy mixture into a distilling tower to obtain coarse oil and tower bottom product through distillation separation; mixing the coarse oil and the light oil to obtain liquid fuels of gasoline, kerosene, diesel fuel, fuel oil, and the like through upgrading process; and processing the tower bottom product to get the asphalt paving materials. The invention has the advantage that under the moderate process condition, the liquid fuel and asphalt paving materials canbe produced simultaneously.

The invention relates to a coal dust suppression agent and a preparation method thereof. The coal dust suppression agent comprises 0.5-1.5wt% of sodium carboxymethyl cellulose, 0.5-1.5wt% of sodium carboxy nethyl, 0.1-0.3wt% of glycerol and 96.7-98.9wt% of water. The coal dust suppression agent can be mixed at normal temperature without needing any other warming-up devices; after being mixed at the normal temperature, the coal dust suppression agent is sprayed or coated on the coal of carriage, so that a solidifying layer is formed on the coal, and dust pollution along the line and dust loss of the coal when in the railway transport can be avoided. Furthermore, the coal dust suppression agent does not cause environmental pollution, and has great economic benefit for railway transport and coal customer as well as social benefit for environmental protection. The method of the invention is simple in operation, low in cost and good in dust suppression effect.

The invention provides a difficult-separation iron ore tailing pelletizing rotary kiln magnetic roasting treatment technology. The technology mainly comprises the following technological steps: 1, carrying out magnetic separation enrichment of iron ore tailing by a strongly-magnetic magnet separator having a field intensity of 0.6-1.2T; 2, uniformly mixing an obtained enriched tailing with coal dust and a binder according to a ratio of 100:0.5-2:1-3, drying, carrying out damp milling treatment, and pelletizing; 3, drying pellets obtained in step 2; 4, carrying out the magnetic roasting of dried pellets by adopting a rotary kiln; 5, cooling the magnetically-roasted pellets in a water quenching mode; 6, milling the cooled pellets; and 7, carrying out magnetic separation of ground ore powder to obtain iron ore concentrate. The technology allows the iron ore concentrate having a TF2 grade of about 56% can be obtained, increases the metal recovery rate to above 75% from original 65-70%, improves the resource utilization rate and reduces the environmental pollution.

The invention relates to a feeding method for a hole protecting pipe for a soft coal seam gas extraction hole. The feeding method is characterized in that an epoxy resin adhesive is used for filling sieve pores of the hole protecting pipe before the hole protecting pipe is fed into a drill hole, air with a certain pressure is pressed into the hole protecting pipe in the process of feeding the hole protecting pipe into the drill hole, the air flows into the drill hole through a vent hole arranged at the top end of the hole protecting pipe, and high-speed air currents discharge coal dusts from an orifice along the hole protecting pipe and a gap of the wall of the drill hole. After the hole protecting pipe is fed into the bottom of the hole, an epoxy resin adhesive dissolving agent is injected into inner holes of the hole protecting pipe for dissolving the expoxy resin adhesive in the sieve pores so as to extract the gas. The feeding method is convenient in operation, can overcome the problem that the hole protecting pipe is difficult to feed into the drill hole due to the residual coal dusts in the gas extraction hole and local hole collapse, and has the advantages of long feeding distance of the hole protecting pipe, thereby ensuring the higher concentration and high flow of the soft coal seam gas extraction. The feeding method is particularly suitable for soft coals and very soft coal seams in which hole collapse easily occurs.

The invention provides a U+I type ventilation system for a work surface of top coal caving, which is an improvement of the arrangement of the U type, the U+L type and the E type or B type laneways and the ventilation systems in the prior art. An air intake way and an air return way of the work surface of top coal caving are arranged along a bottom board of a coal bed, and a regulation air door is arranged on the part of the air return way close to a big air return lane to control the reasonable ventilating parameter of the U+I type ventilating system. The invention is mainly characterized in that air exhausting lanes of top boards are arranged in parallel along the air return way with the parallel outward-staggered distance of 0 m to 5 m from the air return way to form the U+I type ventilating system of a one-intake and two-return mode. The invention fundamentally solves the problem of the accumulation of gas and coal dust on the upper section, the upper spatial angle and the gob area of the work surface of top coal caving, in particular the problem of the accumulation of the gas and the coal dust of the upper space of the upper gob area, provides a safe and high-effect ventilating system, and creates an excellent mechanical environment for realizing the exploitation of the top coal caving of small coal pillars and increasing the recovery rate of coal.

The invention discloses an automatic dedusting system for coal mines, which comprises a nozzle, a dedusting medium supply system, an air compressing device, an explosion-proof coal dust concentration sensor, an explosion-proof electromagnetic control valve and an explosion-proof PLC control system, wherein the explosion-proof coal dust concentration sensor fixedly connected with the nozzle senses the coal dust concentration on the nozzle; the explosion-proof PLC control system analyzes a coal dust concentration signal transmitted by the explosion-proof coal dust concentration sensor and sends a dedusting medium ejecting instruction; and the dedusting medium ejecting instruction is performed by the explosion-proof electromagnetic control valve. The automatic dedusting system for coal mines can realize automatic control on dedusting operation, realize the matching of the ejection quantity of the dedusting medium and the coal dust concentration in real time, improve the dedusting efficiency, reduce medium consumption, save cost and energy source, simplify operation process and reduce labor intensity of workers.

The invention relates to a sand burning preventing coal dust free green sand for casting and preparation method thereof. The green sand contains 50-90% of naturally clay-bonded sand, 2-40% of sand burning preventing assistant and 2.5-20% of water by weight percent; the preparation method includes that the naturally clay-bonded sand and the sand burning preventing assistant are mixed in a sand mixing machine and the water is added for mixing to uniform. The green sand of the invention contains no coal dust and can be recycled; the casting mould made by the green sand of the invention is utilized to produce castings, crude sand consumption is low, the surface of casting is not burning-on, surface quality is high, no coal dust is required to add, recycling of moulding sand is good, environmental protection is less, and high temperature mould dismantling improves productivity.

The invention discloses a method of extracting aluminum oxide from coal ash and preparing cement with waste slag, which comprises the following steps: adopting ''one stove two usage'' craft through coal dust stove of heat power plant; cooling and producing aluminum oxide clinker at the same time; abstracting aluminum oxide to get aluminum oxide product; using waste slag to prepare cement. This invention possesses characterize of reducing the energy consumption of aluminum oxide and cost of production.

The invention relates to coal dust combustion technology and particularly relates to an efficient coal dust combustor for reducing smoke NOx content. The invention solves the problem that the existing grading air supply coal dust combustor cannot be applied to small and medium coal dust boilers. The efficient coal dust combustor comprises a primary air pipe, wherein an inner cavity of the primary air pipe forms a primary air channel; the outer side of the primary air pipe is coaxially sleeved with an air mixing sleeve; the inlet end of the air mixing sleeve is communicated with an air mixing inlet pipe; the air outlet end of the air mixing sleeve is provided with an air mixing expansion section; the inner wall of the air mixing sleeve and the outer wall of the primary air pipe jointly encircle an annular air mixing channel; the outer side of the air mixing sleeve is coaxially sleeved with an inner secondary air sleeve; and the inlet end of the inner secondary air inlet is communicated with an inner secondary air inlet pipe. Based on a brand-new structure, the efficient coal dust combustor disclosed by the invention effectively solves the problem that the existing grading air supply coal dust combustor cannot be applied to the small and medium coal dust boilers; in addition, the efficient coal dust combustor can be applied to the small and medium coal dust boilers.

This invention relates to a method and a gas dissolvant for the frequent gas explosions in coal mine. Its procedures are as following: the gas dissolvent and water are poured in turn into the coal seams containing gas. The gas dissolvent is a kind of water solution made up of acetum and yeast which selective weight ratio is 1000:5-15. The acetum is preferred to be replaced by vinegar of the same acetum. After the vinegar is added into the yeast, their dehydro-ratio is 2-8 times as heavy as the vinegar. The advantages are safety efficient, more feasible and harmless to human body.

The invention discloses coal dust combustion improver for cement kilns, which comprises the following components by weight percentage: 50-80% of manganese ore, 10-40% of chemical activator, 5%-15% of clinker sintering agent, and less than 2% of moisture content. The coal dust combustion improver for cement kilns of the invention has the effects of promoting concentrated combustion of coal powder and improving the strength of clinks, and the combustion-supporting mechanism of the coal dust combustion improver is as follows: by combustion-supporting components, the fire point of coal powder is decreased, the melting point of coal powder ash is increased, and combustion atmosphere is regulated at high temperature, thereby achieving the purpose of utilizing fault coal fully in the process of cement burning and the purposes of promoting the sintering reaction of clinkers and improving the strength of clinkers by adding combustion improver components of cement clinkers.