502 results about "Dust emission" 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 present invention relates to compositions useful for the suppression of fugitive dust emissions and methods of suppressing dust emissions by application of an aqueous solution comprising a surfactant, wetting agent and an acrylic copolymer. The compositions of the invention are effective in wetting, penetrating and improving particle cohesion and reducing water evaporation. They can also be used as a knockdown agent for airborne dust and for minimising soil and dust erosion, blowing and loss from roads and bulk solids, mineral flotation processes, waste management applications and as a binding agent.

The invention discloses an iron mine sintering flue gas segmented circulation method. Sintering flue gas high in O2 content on the tail portion of a sintering machine is circulated to the interior of a head flue cover of a sintering feed surface of the head portion of the sintering machine, flue gas of two to three bellows highest in SO2 content in a bellow on the tail portion of the sintering machine is conveyed to a desulfurization system to be desulfurized, and flue gas in other bellows is circulated to a middle flue cover of a sintering feed surface of the middle portion of the sintering machine. After segmented flue gas circulation is adopted, SO2 will not be accumulated in sintering ore, dust emission is reduced by 20-40%, NOx emission is reduced by 20-40%, dioxin emission is reduced by 50-80%, and CO2 emission is reduced by 20-45%.

The invention relates to a centralized drying system of high-humidity grain and a drying method thereof. According to the grain deliver direction, the centralized drying system comprises a preliminary cleaning machine, a wet grain hoister, a wet grain dryer, a conveyor, a middle hoister, a main drying tower, a dry grain conveyor, a dry grain hoister and a dry grain storage silo which are successively connected, wherein the main drying tower successively comprises a high-temperature drying section, a low-temperature drying section and a cooling section; the system also comprises a hot-blast stove, a heat exchanger, a dust remover and a smoke draught fan which are successively connected, wherein the smoke draught fan is connected with the wet grain drier; the heat exchanger is connected to the main high-temperature drying section by an air heater, and the air heater is connected to the low-temperature drying section by a thermosistor; the heat exchanger is connected with the wet grain drier by a wind stopping device and an air cooler; and ambient air is communicated with the air cooler by the cooling section. The drying system can fully utilize natural air and recycle the waste heatand waste gas of the drying system to efficiently dry in an energy saving mode and reduce drying waste gas, waste liquid and dust emission; the drying system has favourable drying effect and is especially suitable for drying a great quantity of high-wet grain in a centralized mode.

The invention relates to a construction method of a soil covering tank for storing product oil and the like, which comprises the following steps of: (A) building a tank chamber of a soil covering tank: firstly, carrying out earth excavation with a method combining a back-acting shovel and manual excavation; then, manufacturing a ring beam, precasting concrete blocks on the spot according to the radian of the ring beam, and building the concrete blocks; carrying out the engineering of steel bars: welding steel bars by machining, and manually binding the steel bars on the spot; carrying out the engineering of templates and scaffolds: taking a bamboo plywood as a top plate template of a concrete thin shell of the tank chamber, designing a camber at the middle part, and taking scaffold tubes as bottom template brackets of the thin shell of the tank; then, carrying out concrete engineering and asphalt sand construction; and finally, carrying out waterproof engineering, thereby completing the construction of the tank chamber of the soil covering tank; and (B) installing a storage tank body of the soil covering tank: firstly, precasting the storage tank body; then, installing a tank bottom plate; installing the tank body, and welding the storage tank; and finally, testing and inspecting to complete the whole construction process of the soil covering tank after the construction is qualified. The invention reduces the occurrence of accidents, increases the benefit and reduces the dust emission.

The invention discloses a flame-retardant anti-dripping resin compound, consisting of 100 weight portions of thermoplastic resin, 0.01-5 weight portions of modified polytetrafluoroethylene anti-dripping agents and 20 to 40 weight portions of environment-friendly flame retardant containing phosphorus and/or nitrogen. The resin compound has strong anti-dripping effect and heat resisting performance, is level and smooth in exterior appearance, and can endow polyester fiber products with excellent enduring flame retardancy without using halogen (Cl and Br) flame retardant. The resin compound has the advantages of high oxygen index, droplet resistance, low heat release rate, no halogen, little toxicity, low smoke dust emission, little influence on the mechanical properties of base materials, etc.

The invention discloses a submerged-arc welding root welding and back chipping process of a thick plate with a K-type groove. The K-type groove is an asymmetric K-type groove, an upper open angle and a lower open angle of the groove are both 45 degrees to 50 degrees, and truncated edges are not reserved at the root. During assembly, groove clearance of 2mm to 3mm is reserved. During welding, solid gas protection welding wires under pulse current are adopted for backing welding of a root pass of the front side of a K-type groove test piece, and after the root pass is thoroughly fused, a part of weld metal penetrates through the reverse side of the groove to achieve backing welding. After welding, back chipping of the reverse side is performed. Finally, gas shielded welding under large current is adopted for fusion welding of the roof of the reverse side groove, and gas rich in argon is used as protective gas. The submerged-arc welding root welding and back chipping process reduces time for slag removal of root pass of submerged-arc welding and polishing and finishing of the reverse side groove of the welding test piece, improves welding efficiency by more than 30%, removes a carbon arc gouging process, decreases welding noises and dust emission, lowers labor intensity of welders and reduces time for damaging workers under high-decibel noises.

The invention relates to an automatic spray device for blocking dust, including an automatic induction mechanism, a spray mechanism, a spray control mechanism and a dust suppression mechanism; the spray mechanism controls the spray mechanism by the induction signal of the automatic induction mechanism. The invention also provides an automatic spray dust blocking method; the automatic induction mechanism induces environmental parameters and sends the induction signals of the environment parameters to the spray control mechanism, according to the induction signals the spray control mechanism sends instruction to control the spray mechanism to spray or stop spaying fluid to the dust suppression mechanism and/or a material heap. The automatic spray device can realize full automatic management or adopt manual management, thus having convenient use, obvious effect and being capable of treating the pollution problem caused by aeolian erosion and dust emission from working surfaces; meanwhile, the automatic spray device can achieve the functions of auto-regulation, spraying, water conservation, self cleaning, waterproof property, dust collecting, and so on according to the external environment.

The invention relates to a coarse straw bundle negative-pressure coarse grinding method. The coarse straw bundle negative-pressure coarse grinding method is characterized in that a straw bundle passes through an un-roping belt conveyor, an inclined scraper conveyor, a vertical type straw bundle coarse grinder, an air suction tube, a cyclone separator, an unloading air sealer, an air suction tube, a pulse bag dust collector, a dust-collecting air sealer, an air suction tube, a high-pressure draught fan and an air outlet tube; the vertical type straw bundle coarse grinder, the air suction tube, the cyclone separator, the unloading air sealer, the air suction tube, the pulse bag dust collector, the dust-collecting air sealer, the air suction tube, and the high-pressure draught fan are connected through the air suction tube, so that the straw bundle coarse grinding is continuously performed under a negative-pressure pneumatic transmission state. The vertical type straw bundle coarse grinder is characterized by being vertically arranged, wherein a gear roller bundle-off region, an electromagnetic iron removal region, a hammer sheet crushing region and a specific gravity stone removal region are arranged in a crusher tank body from top to top in sequence. According to the detection, the dust emission of the coarse straw bundle negative-pressure coarse grinding method meets the national environmental-friendly standards. The coarse straw bundle negative-pressure coarse grinding method realizes large-scale clean continuous coarse grinding of the straw bundle, can be applied to the fields of straw manmade plates, straw energy resources, straw feed and the like, and provides a novel and reliable process and complete equipment.

A working machine for use in milling the surface of a road includes a drive engine that produces engine exhaust gases. The working machine also includes a milling drum that is mounted for rotation against the surface of the road so as to generate milled material including dust from the road surface. The milling drum is contained within a milling chamber, and a spray assembly directs water into the milling chamber in such a manner that, during a period of rotation of the milling drum against the surface of the road, at least a portion of the water is converted to a vapor. A conduit is provided for conducting at least a portion of the engine exhaust gases into an enclosed space in communication with the milling chamber to raise the temperature of a gas stream therein containing vapor and dust from the milled material.

The invention relates to a wind tunnel test system for a dust sensor, which comprises a dust drying device, a speed adjustable dust feed device connected with a dust output port of the dust drying device, and a dust wind tunnel. The dust wind tunnel comprises a wind inlet, a test section and a wind outlet; a dust output end of the speed adjustable dust feed device is arranged on the wind inlet of the dust wind tunnel; a dust sensor and a dust sampler are arranged in the test section of the dust wind tunnel parallelly; the wind outlet of the dust wind tunnel is connected with a dust removal device and a residual dust emission device in sequence; the dust sensor is connected with a dust concentration display device which displays a dust concentration value; dust sampled by the dust sampler is weighed through a dust weighing device to obtain the dust weight acquired in unit time; then, a corresponding dust concentration value can be calculated; and finally, the dust concentration value is compared with the dust concentration value displayed on the dust concentration display device, and a measurement error of the dust sensor can be calculated, thereby providing basis for trial manufacture, production and maintenance of the dust sensor.

The invention relates to a phosphorus ore dust suppressant composition and a preparation method thereof. The phosphorus ore dust suppressant composition comprises water-soluble polyvinyl alcohol, guar gum, microbicide, and water. The phosphorus ore dust suppressant provided by the invention can form a solidifying layer with certain strength and tenacity on the surface of phosphorus ore or powdered ore, which allows granular or powdered phosphorus ores to bond together, so as to effectively suppress dust emission of powder phosphate ores. The phosphorus ore dust can also be used for treatment of soil desertification and dust suppression at construction sites or dust suppression of other ores and can not pollute environment.

A slab continuous casting crystallizer protection slag automatically adding device, pertaining to the field of continuous casting process equipment, includes a large hopper, electric valves, a feeding tube, a small hopper, a screw feeder, a two-dimensional movement mechanism and a base. The device uses gravity to fall material from height, so that the large hopper is far away from the crystallizer mouth, to increase storage amount and allow long time of continuous work; the small hopper with small size, the screw feeder and the two-dimensional motion mechanism are reasonably installed at the intermediate tanker flank nearby the crystallizer to avoid the obstruction to the observation and operation of workers because the device is mounted in front of the crystallizer; the precise control of the feed amount can be achieved by the screw feeder; the conveyer tube is totally enclosed, which avoids slag leakage and dust emission; orthogonal coordinate type two-dimensional motion mechanism can realize a larger area of protection slag uniform spreading, which adapts to different sizes of slabs and billet production; automatic uniform slag adding is achieved, billet surface quality can be improved and the labor intensity of workers is reduced.

The present invention discloses a mine field dust emission inhibitor and a preparation method thereof. The raw materials of the mine field dust emission inhibitor comprise a surfactant, a stabilizer, a wetting agent, an anti-freezing auxiliary agent, and water. During preparation, a proper amount of water is firstly added into a reaction kettle, and the surfactant and the stabilizer are added into the reaction kettle; after the surfacant and the stabilizer are sufficiently dissolved, the wetting agent is slowly added, and dissolved by stirring; then, the anti-freezing auxiliary agent is added; and finally, the residual water is added until determined concentration. According to the mine field dust emission inhibitor disclosed by the invention, the dust suppression principle of the mine field dust inhibitor is that the surfactant is utilized to form an isolating membrane on the contact surface of dust and air, and the isolating membrane has good water carrying property and adhesive property, so that the isolating membrane on the dust surface has stronger wettability and stability, and small-particle dust is aggregated into a large-particle solid, thereby achieving an ideal dust falling effect. and by adding a small amount of salt, the dust inhibitor has certain anti-freezing effect.

The invention discloses a dry-type flue gas desulphurization, denitration and dedusting integrated device and method. The integrated device comprises a flue gas guide device, a reactor, a dedusting device, a draught fan and a funnel which are sequentially connected, as well as a circulation dust fluidization cabin, a humidifying digester, a denitration additive storage bin and a desulphurization absorbent storage bin. The circulation dust fluidization bin is arranged at the bottom of the dedusting device, the output end of the circulation dust fluidization bin is connected with the input end of the humidifying digester, and the output end of the desulphurization absorbent storage bin is also connected with the input end of the humidifying digester. The output end of the denitration additive storage bin is connected with at least one of the input end of the humidifying digester and the flue gas guide device. The invention has the advantages of simple process, small occupation, low one-time investment and low operating cost, the SO2 removing efficiency is 80 to 95%, the NOx removing efficiency is 40 to 65%, and the dust emission concentration is less than 50 mg/Nm<3>. The desulphurization and denitration efficiency of the invention can meet the requirement of environmental protection, the running resistance of the device is low, and no sewage generates during the desulphurization and denitration processes. The final product is dry powder and can not cause any secondary pollution, the flue gas can be directly discharged without the need of heat exchange, and the added denitration additive has the synergistic effect with the absorbent to strengthen the removing of the SO2, thereby enhancing the desulphurization efficiency.

The invention discloses environmental-protection air cleaning equipment used for a hardware production workshop. The environmental-protection air cleaning equipment comprises a movable sweeping board,universal wheels, a support plate rack, a fixed rod frame, an air cleaning cylinder, a separation plate, an air-inlet pipe, an air-outlet pipe, a multiple screening processing apparatus, a dust-emission pipe, a turbine air-exhaust fan, a turbine air-exhaust apparatus, a servo motor, an electricity-connection box, and a distribution box. The movable sweeping board is in a rectangular stricture, the universal wheels are arranged at four ends below the movable sweeping board, and connected through screws in a spiral mode. The multiple screening processing apparatus can separate iron filings, metal shreds and dust collected during an air cleaning process, air purifying is realized, resource can be reutilized and classified for recovery, resource waste can be prevented, the utilization rate ofthe resource is increased, and the environmental-protection air cleaning equipment can effectively enhance the environmental protection performance for the air cleaning equipment.

A collector assembly is configured to vent dust-laden air through at least one filter in one direction using pressure in an air conveyor, whereby dust collects on one side of the filter or filters. The collector assembly is further configured to pulse compressed air through the filter or filters in an opposite direction to dislodge the collected dust into the air conveyor without the dislodged dust entering the atmosphere around the air conveyor.