274results about How to "Improve dust suppression efficiency" patented technology

The invention provides an efficient environment-friendly dust suppressant as well as a preparation method and application thereof. The efficient environment-friendly dust suppressant can solve the problems of single function, possibility of causing secondary pollution, and the like, of the present product, is widely applied and is especially suitable for roads with small dust particles, such as, capturing and absorbing for total suspended particulates, PM10, PM2.5 and nitric oxide. The efficient environment-friendly dust suppressant provided by the invention is prepared by mixing the following components by weight percent: 0.1-7% of latex, 0.1-6% of modified starch / modified cellulose, 0.1-5% of sodium alga acid, 0.1-8% of polyvinyl alcohol, 0.1-8% of sodium silicate, 10-60% of glycerol, 0.01-5% of surfactant and the balance of water.

The invention provides a high-efficiency environmental-friendly dust suppressant as well as a preparation method and application thereof. The high-efficiency environmental-friendly dust suppressant disclosed by the invention solves the problems that the conventional product is single in function, secondary pollution is introduced and the like, has wide application and is particularly applicable to roads with less dust particles, for example, the dust suppressant is used for capturing and adsorbing TSP (Total Suspended Particulates), PM10, PM2.5 and nitric oxides. The high-efficiency environmental-friendly dust suppressant disclosed by the invention is mainly prepared by mixing the following components by weight: 0.1-10% of polyvinyl alcohol, 0.1-5% of sodium silicate, 10-50% of glycerin, 0.01-5% of a surfactant, 0-5% of a preservative, and the balance of water.

The invention discloses a dust preventing device of a machine digging surface and a dust preventing method. The dust preventing device comprises a tunneling machine head spray and a crushing transfer system spray, wherein a wrapping type spray device is arranged at the back end of a tunneling machine head; the front end of the tunneling machine head is exposed outside the wrapping type spray device; the wrapping type spray device comprises an inner steel pipe and an outer steel pipe sleeving the tunneling machine head; and eight mixing type nozzles containing X-shaped diversion core wide-angle spiral openings are evenly arranged between the inner steel pipe and the outer steel pipe for forming a spherical dust reducing area wrapping a tunneling surface head. As for the dust generation of a crushing transfer system, a dust hood is arranged at the joint of a bridge type transfer machine and a belt conveyer outside a crusher, so as to control dust in an all-closed manner; on the other hand, the efficient dust capture is performed by all-aspect and multi-angle atomization nozzles; and in addition, more comprehensive dust preventing measures are formed on the machine digging surface by combining chemical dust removing technology with air curtain dust isolating technology, so that the dust concentration of the machine digging surface is reduced below 10 mg / m3, and the operation environment of workers is greatly improved.

The present invention discloses a dust inhibitor and a preparation method thereof, wherein the dust inhibitor comprises the following raw materials by mass: 0.001-4.50% of a surfactant, 0.001-4.00% of an alcohol auxiliary agent, 0.005-3.00% of an inorganic salt additive, and the balance of water, wherein the alcohol auxiliary agent is at least one selected from ethanol, ethylene glycol, glycerol, n-butanol and polyethylene glycol. According to the present invention, the dust inhibitor is mainly used in the wet spraying dust falling process and can be rapidly dispersed in water; during the use, the dust inhibitor is added to water for spraying dust falling, rapid wetting and flocculation agglomeration are performed on the dust produced during mining, blasting construction and other production processes along with the mist droplet spraying so as to promote the dust to rapidly fall and improve the spraying dust falling efficiency; and the dust inhibitor can further be added to the dust inhibition bag or water flooding so as to improve the blasting dust falling efficiency or water flooding dust falling efficiency.

The invention discloses a compound foaming agent used for depositing dust and a preparation method thereof. The compound foaming agent is prepared from following materials by weight: 5-8 parts of an alkyl polyglucoside, 20-25 parts of a fatty alcohol-polyoxyethylene ether, 9-14 parts of fatty alcohol polyoxyethylene ether sodium sulfate, 1-2 parts of 2-ethyl hexyl succinate sodium sulfonate and 51-65 parts of water. The compound foaming agent has advantages of good acid and alkali resistance and hard-water resistance, strong foaming capability, fine and rich foams, small bubble sizes, moderate stability, large dust contacting area, good adhesiveness and wettability, enhanced dust depositing effects, enhanced capturing capability for respirable dust in particular, no toxicity, no harm, no skin irritation, rapid and complete biodegradation, selection of raw materials common in market and low cost. The compound foaming agent has wide applicability in the field of dust deposition using foams.

The invention discloses a dust suppressant as well as a preparation method, a using method and application thereof, and relates to the technical field of dust suppressants. The dust suppressant is mainly prepared from the following components by weight percent: 30-70% of crusting agent, 0.5-5% of moisturizing agent, 0.5-10% of surfactant, 0-2% of auxiliary materials and the balance of water. The crusting agent is prepared from natural latex; the surfactant is prepared from a polyoxyethylene type nonionic surfactant. The dust suppressant provided by the invention is environmentally friendly andcan adhere soil particles; after being dried, the soil surface sprayed with the dust suppressant has an obvious crusting phenomenon; the dust suppressant is high in dust suppression efficiency, has higher moisturizing rate and excellent film forming property, and also has the characteristics of being low in transportation cost, convenient and fast to use, and the like. The preparation method andthe using method of the dust suppressant are simple and easy to implement; the preparation method is convenient to operate and control, and low in energy consumption and cost, thus being very suitablefor industrial production. When in use, the dust suppressant can be sprayed after being diluted with water, thus being convenient to use and good in effect.

The invention provides an air curtain and water mist linkage dust settling method for a full mechanized workface, which is applicable to dust control in a full mechanized workface in an underground coal mine. According to the invention, an air curtain generator arranged in a no man's zone located between a head-on workface and a driver of a heading machine is started to form an air curtain, and an enclosed area is formed between the head-on workface and the air curtain, which prevents dust from spreading outwards; simultaneously, water mist is injected into the formed enclosed area, and the water mist rapidly disperses in the enclosed area to capture dust in a moistened settling enclosed zone, thereby realizing air curtain and water mist linkage dust settling for the full mechanized workface. The method has the advantages of a simple process, convenient operation, small water consumption, low utilization cost and high dust settling efficiency; the water mist injected into the enclosed area can wet the surface of coal rock mass in head-on full mechanized workface, which enables gas and dust explosion induced by sparks generated in cutting of coal rocks to be avoided; the invention has wide practicality.

The invention relates to an air curtain and water mist linked system for preventing and controlling dust on comprehensive excavation surfaces. The air curtain and water mist linked system is composed of a water inflow pipe, a pipeline filter, a main gas inflow pipe, a linkage valve, branch gas inflow pipes, adjusting valves, pressure gauges, an air curtain generator, a water mist generator and a water mist conveying pipe, wherein the pipeline filter is arranged at the initial segment of the water inflow pipe; the linkage valve is arranged between the water inflow pipe and the main gas inflow pipe and is used for simultaneously controlling the on and off of water and gas; the main gas inflow pipe is divided into two branch gas inflow pipes by a tee joint; the air curtain generator is connected with one branch gas inflow pipe; the water mist generator is connected with the water inflow pipe and the other branch gas inflow pipe; and the adjusting valves and the pressure gauges are sequentially arranged on the branch gas inflow pipes and the water inflow pipe and used for adjusting the working pressure of water and gas. The air curtain and water mist linked system has the characteristics that: when the linkage valve and adjusting valves are opened to form an air curtain and generate a dust isolation region, the water mist is injected into the dust isolation region, thus the effective control to the dust on the comprehensive excavation surfaces is achieved; and the system is simple and convenient to operate, free of electrical elements, agile to move as well as safe and reliable, and has broad practicability.

The invention discloses a dust suppression device used in the construction site. The dust suppression device comprises a bottom plate, a casing, a water tank, an atomizing spray pipe, a dust suction cavity and a cylinder, wherein the casing is fixedly mounted at the upper end of the bottom plate, the dust suction cavity is formed in the inner side of the casing, a motor is arranged at the upper end of the dust suction cavity, and the output end of the motor is fixedly connected with a rotating shaft; the cylinder is fixedly mounted at the right end of the dust suction cavity, a piston is glidingly connected into the cylinder, the upper end of the piston is fixedly connected with a threaded rod, and the other end of the threaded rod is connected into a threaded sleeve in a threaded manner;the water tank is arranged on the left side of the dust suction cavity, the lower end of the water tank is fixedly connected with the bottom plate, and a water suction pump is arranged at the upper end of the water tank. According to the dust suppression device, dust suppression treatment is carried out in two modes simultaneously, so that dust suppression efficiency is high, and dust suppressioneffect is good; treated gas is introduced into a hollow cavity of a first rotating rod, the first rotating rod is driven to rotate under the action of arc-shaped spray pipes, therefore, the dust suppression range is enlarged, and energy is sufficiently utilized.

The invention discloses a space three-dimensional dust control and removal method for dust produced during bracket moving of a fully mechanized mining face. Different dust-proof measures are conductedon the upper, middle and lower spaces of the fully mechanized mining face, an air curtain machine or different kinds of nozzles is / are utilized to form a gas-water double-curtain closed space and a single fog filed closed space, a sensor sends a signal to a central processing system, thus fully-automatic spraying dust-reduction in the bracket moving process of column descending, bracket advancing, column ascending and the like is conducted, and the high-concentration dust is concentrated in the closed space to be treated in a concentrated mode, or the high-concentration dust is blocked outside the closed space; by utilizing closed dust-isolation and spraying dust-reduction modes, a wireless transmission system is adopted, a remote control device is utilized to send a radio signal, a signal processor receives the signal and transmits the signal to the controller, thus the controller can adjust the air volume of the air curtain machine, the spraying range of the nozzles and the water passing pressure, the dust reduction efficiency in the bracket moving process is improved to 95% or above, coal dust explosion accidents are avoided, and the operation environment of workers is also greatly improved.

The invention provides a clean soil-stabilizing and dust-suppression agent which is composed of, by weight, 2-5 parts of sodium silicate, 0.3-0.6 part of sodium carboxymethylcellulose, 1.5-2 parts of glycerol, 5-10 parts of pure acrylic emulsion, 0.25-1 part of sodium dodecyl benzene sulfonate and the rest of water. The invention also provides a preparation method of the above clean soil-stabilizing and dust-suppression agent. The preparation method comprises the following steps: firstly dissolving sodium silicate and sodium carboxymethylcellulose in water, adding the solution and glycerol into a reaction vessel, fully mixing at the temperature of 40-50 DEG C, adding pure acrylic emulsion, fully reacting and mixing at 25-35 DEG C, adding a sodium dodecyl benzene sulfonate solution, and continuously fully reacting and mixing so as to obtain a clean soil-stabilizing and dust-suppression agent. The dust-suppression agent of the invention has bonding and moisture-absorption effects, and has strong anti-evaporation property and good permeability. Effective dust suppression time is as long as 30 d, and dust suppression efficiency is maintained to be 95% and above.

The invention relates to the field of mineral dust treatment, and particularly provides a dust suppressant and a preparation method and application thereof. The dust suppressant is composed of the following components in parts by mass: 60 to 62 parts of vegetable gum, 24 to 28 parts of a humectant, 8 to 12.5 parts of a wetting agent and 2.5 to 3 parts of a thickening agent. The dust suppressant has the advantages of good dust suppression effect, high dust suppression efficiency, good environmental protection property, easily-degradable raw materials, small secondary pollution, low cost, long moisturizing time and long cured layer preservation time, has the characteristics of multiple dust suppressants, and has good adaptability to the environment of mine tailings ponds.

The invention discloses a mine dust grading combined dust fall device. A primary dust fall system is formed by an inner spraying device and an outer spraying device which are arranged in a coal cutter or a heading machine. The mine dust grading combined dust fall device comprises a secondary haze transform system formed by an ultrasonic wave dry haze generator and a tertiary drizzle wall haze fall system formed by a drizzle generating device. By means of the mine dust grading combined dust fall method and device, conventional instantaneous point dust fall is changed into segmental process dust fall, mine dust different size fraction can be inhibited and reduced by forming water mist particles or gas water mist particles different in particle diameter, and particle diameter grading, segmental inhibition and reduction and process transformation of mine dust in wind current of mining ports are achieved. The mine dust grading combined dust fall device can move along with pushing of the mining points and has functions of automatic control and rain stopping when people go out, dust fall efficiency is high, and dust inhibition, dust fall, explosion protection, fire protection, temperature reduction and drag reduction of return current are achieved by humidifying dirty wind. Compared with the conventional dust fall method, dust fall effect is obvious.

The invention discloses an ultra-micro magnetized foam drilling dust remover, which is applicable to the underground dust removal of a coal mine. The dust remover is mainly composed of a drilling stopper, a first-stage dust settling device and an ultra-micro magnetized foam dust capturing device. The drilling stopper is connected with the first-stage dust settling device. The first-stage dust settling device is connected with the ultra-micro magnetized foam dust capturing device. By means of the first-stage dust settling device connected onto the drilling stopper, large-particle coal dust generated in the drilling process of coal and rock mass is led out through a conical cylinder; the coal dust and gas enter the ultra-micro magnetized foam dust capturing device and are gradually subjected to dust settling in three compartments of the dust collecting device; compared with the prior art, the dust remover has the advantages of simple structure, safety for operation and convenience for use; and by adopting the graded dust settling theory in a dry-process and wet-process combined way, the dust removing process and the drilling process are carried out synchronously, and the efficiency for settling whole dust, in particular respiratory dust, is high.

The invention discloses an air-water double-curtain dust settling device and a method for a fully-mechanized excavation face. A hydraulic support comprises front support beams and main support beams, each main support beam has at least two air injection holes behind a hinged position, two air injection holes in a plurality of main support beams jet air simultaneously to form a shielding air curtain perpendicular to the main support beam, the shielding air curtain, the front support beams and a coal wall form a dust control space, at least one row of air distributing holes and at least one row of mist spraying nozzles are arranged on each front support beam, the air distributing holes of the plurality of front support beams jet air simultaneously to form a plurality of barrier air curtains perpendicular to the front support beams, the barrier air curtains divide the dust control space into a plurality of dust settling spaces, the corresponding mist spraying nozzles spray simultaneously to form a dust settling water curtain. The air-water double-curtain dust settling device is used in an underground coal mine through spraying for dust settlement and air curtains for dust separation, a closed and comprehensive dust prevention space for a coal mining machine is formed on the fully-mechanized excavation face, and the air-water double-curtain dust settling device is safe and convenient and has the dust settling efficiency up to 99%.

A purpose of the invention is to research and develop a composite road flying dust wetting material with characteristics of convenient use, long effective action time and low cost. The invention provides a wetting type dust suppressant for road flying dust, and a preparation method thereof, and belongs to the field of road flying dust control. The wetting type dust suppressant is prepared from thefollowing raw material components in percentage by mass: 0.1-2% of sodium lactate, 0.1-6% of Span-80, 0.1-3% of glycerol, 0.1-5% of a binder, 0.5-5% of urea, 1-20% of CaCl2, 0.1-1% of a surfactant and the balance of water. According to the wetting type dust suppressant disclosed by the invention, the humectant, the moisture absorbent, the surfactant and the binder are combined, so that a certainwater content of a road surface is continuously kept, the road dust suppression effect is ensured, the material strength is high, and the action effect of the dust suppressant is improved.

The invention discloses a self-adsorption air type foam dust suspension system for a coal mining working face, and is particularly suitable for dust control of comprehensive mechanized coal mining working faces or comprehensive mechanized caving working faces. The self-adsorption air type foam dust suspension system mainly comprises components such as a high pressure water pipe, a pressure regulation valve, a liquid storage tank, a foaming agent adding device, a self-adsorption air rotational flow foaming device, a regulating valve and a circular arc foam spray head, wherein pressure water in a dustproof water supply system of the coal mining working face is jointed with the high pressure water pipe and regulated to proper pressure by virtue of the pressure regulation valve; the foaming agent in the liquid storage tank is automatically sucked into a water pipeline by virtue of the foaming agent adding device to form a foaming agent solution; and because gas phase-liquid phase foam is prepared by the self-adsorption air rotational flow foaming device arranged on a coal mining machine, the circular arc foam spray head is used for ejecting the foam to a left rolling cylinder and a right rolling cylinder of the coal mining machine for slicing dust sources. The system has a simple structure, and is convenient to mount and operate, safe and reliable; and moreover, a pressure ventilation pipeline is not needed, electric parts are not included, and the dust control effect of the coal mining working face can be improved.

The invention relates to dust settling equipment, in particular to water spray dust settling equipment used for tunnel construction. The invention aims at solving the technical problem of providing water spray dust settling equipment used for tunnel construction with high dust settling efficiency and thorough dust settling. The provided water spray dust settling equipment used for the tunnel construction comprises a cart, a water tank, a support, a frame body, a motor, a first belt pulley, a supporting rod, a first bearing block, a first spindle, a second belt pulley, a belt and the like; theleft side and the right side of the top of a sweeping board of the cart are connected with the water tank and the support respectively, the top of the support is hinged and connected with a frame body, the motor is arranged at the left side of the top of the frame body, the first belt pulley is arranged on an output shaft of the motor, and an opening is formed in the left side of the top of the frame body. The water spray dust settling equipment has the advantages that fan blades rotate to drive the air to flow in the frame body from left to right, a piston moves up and down and drives clear water in the water tank to be sprayed in a mist form from an atomizing nozzle, and airflow blows water spray upward, so that the water spray adsorbs dust, and the effects of high dust settling efficiency and through dust settling are achieved.

The invention discloses a working surface dust treating and preventing method based on a working surface on-site coal dust diffusion regulation. A supporting frame negative pressure secondary dust removing device, a coal mining machine negative pressure secondary dust removing device and a wet-type rolling blind dust preventing net, wherein the supporting frame negative pressure secondary dust removing device and the coal mining machine negative pressure secondary dust removing device perform mist spraying dust reducing according to an entrainment mechanism of a water jet, a negative pressurearea can be formed to entrain high concentration dust aggregates in a working area to improve the dust reduction efficiency, the wet-type rolling blind dust preventing net sprays water mist onto a filter net to form a filter membrane under the action of the tension on the surface of water, the bumping probability between dust in air flows and the filter membrane is increased to improve the dust capturing efficiency, the location and manner of three dust reduction measures are designed according to on-site numerical simulation and the distribution of wind flows and the dust, and cooperative using is conducted to achieve the purpose of reducing the dust concentration of the working surface. The method has the advantages that the dust reducing efficiency is improved, and the dust concentration on large-mining-height comprehensive-mining working surface is reduced.

The invention relates to a preparation method of a peanut-shell degradable nano dust suppressant, belonging to the field of suppressant preparation. The method aims to solve the problem that the dust suppressant produced at present has the defects of single effect and unideal dust suppression effect and can not adsorb and aggregate fine dust. The method comprises the following steps: carrying out alkaline hydrolysis on peanut shells to prepare cellulose, carrying out activation and centrifugal separation on the cellulose, dialyzing, collecting the nano cellulose, and carrying out fine dust adsorption by utilizing glycosidic bonds in the nano cellulose. The hydroxy groups in the nano cellulose molecules can easily form hydrogen bonds with intramolecular or intermolecular oxygen-containing groups, so that multiple cellulose molecules form a crystal structure to adsorb the nano fine dust. When the nano cellulose is used for preparing the dust suppressant, the surface layer coal particles can resist the wind at the speed of 20 m / s, so the dust suppression efficiency is up to 98% or above. The waste peanut shells are fully utilized to prepare the dust suppressant, thereby saving the resources and being green and environment-friendly.

The invention aims at solving the problem that an existing dust suppressant is not environmentally friendly, and provides an ecological dust suppressant for surface mine dust treatment and a preparation and use method of the ecological dust suppressant. The ecological dust suppressant is prepared from a water absorbent, a surfactant, sodium polyacrylate, glycerol, sodium lactate and water, and a proper amount of citric acid is added to enable the pH value in the system to be 7.0 + / -0.5; the dust suppressant disclosed by the invention is scientific and reasonable in raw material ratio; the surface tension of dust can be obviously reduced; the dust is quickly wetted and quickly coagulated and settled; meanwhile, repeated water absorption performance, evaporation resistance and the like are achieved, the water content of the dust is larger than a critical value (larger than 4%), the purpose of dust inhibition is achieved, a layer of cured film with certain strength and toughness can be formed on the surface of the dust, the dust inhibition efficiency is improved, the dust inhibition time is prolonged, mine atmospheric dust pollution can be effectively solved, and raw materials are environmentally friendly and free of pollution.

The invention discloses a polynary ionic wetting agent for inhibiting mine dust and a preparation method thereof, which are applied to the inhibition of a lot of dust produced during the production ofa mining working face of a mine. A variety of anionic, cationic, nonionic and neutral ionic surfactants are first isotropically combined and compounded, then anisotropically cross-compounded, added with water, put into a chemical reaction kettle and agitated under 120 DEG C for 2 hours while pressure is kept at 0.8MPa; inorganic salt is added to improve the ionized characteristic of the mixture,and agitation is carried out for 1 hour; adhesive is added to improve the capturing capability of mixture droplets, curing and reinforcing agent is added to increase the suspension period of the droplets in the air, and agitation is carried out for 2 hours; imidazole ionic liquid is added as an additive, agitation is carried out for 1 hour, the mixture is depressurized, cooled and taken out of thekettle, and thereby the polynary ionic wetting agent is formed. The wetting agent can greatly improve wetting capability and capturing capability on respirable dust and prolong the suspension life ofdroplets; the mine dust suppression cost is low, skin cannot be injured, machine corrosion is little, and the polynary ionic wetting agent has good applicability and environment-friendliness.

An adjustable jetting support for dust control of a comprehensive mechanized excavation surface of a mine comprises a support plate and a plurality of connecting lugs. A plurality of input port through holes are disposed in the middle of the support plate at intervals, delivery pipes penetrate through the input port through holes, strip-shaped holes are disposed on two sides of each input port through hole, an elongated bolt is arranged in each strip-shaped hole, a sprayer mounting branch pipe connected with a corresponding input pipe is disposed at the front of each input port through hole of the support plate, branch pipe fixing lugs are arranged on the upper side and the lower side of each sprayer mounting branch pipe and are respectively sleeved on the corresponding elongated bolts, each elongated bolt is provided with an adjusting nut used for fixing and adjusting the distance from the corresponding sprayer mounting branch pipe to the support plate, and a plurality of sprayers are disposed on the sprayer mounting branch pipes. The adjustable jetting support is applicable to treating high-concentration dust by the aid of dust falling media such as water mist, foam and the like when an underground coal mine comprehensive mechanized heading machine cuts and crushes coal rocks, dust falling efficiency and utilization rate of the dust falling media are increased, and the adjustable jetting support is simple in structure, simple and convenient in operation and easy to repair and replace.

The invention discloses an automatic spray dust suppression device for overrun of dust concentration, comprising a ground monitoring master station, a plurality of underground monitoring substations, a plurality of spray and sprinkling dust suppression host machines, a dust concentration sensor, a mine light control sensor and a mine explosive-proof electromagnetic valve, wherein the underground monitoring substations are connected with the ground monitoring master station; the spray and sprinkling dust suppression host machines are connected with the underground monitoring substations; the dust concentration sensor, mine light control sensor and mine explosive-proof electromagnetic valve are connected with the spray and sprinkling dust suppression host machines; the output end of the mine explosive-proof electromagnetic valve is connected with a spray component; and the spray component is composed of a plurality of high-pressure spray nozzles arranged in a spiral sector on a water pipe frame. The ground monitoring master station carries out hierarchical management on the underground monitoring substations and the spray and sprinkling dust suppression host machines and reports status words periodically, the normal work or abnormal work conditions of all underground devices are displayed on the ground monitoring master station through judgment of the status words, and the underground position of a device in abnormal condition is displayed by an underground position serial number. The automatic spray dust suppression device for overrun of dust concentration has the advantages of good spray effect, large coverage area, simultaneous control of automatic operation of a plurality of sprinkling points, good atomization effect, low water consumption and high sprinkling efficiency.

The invention discloses novel air dust settling equipment capable of saving water resources. The equipment comprises a device body and a disinfectant stirring bin, wherein a rotating device is arranged in the middle of the top of the device body; a telescopic rod is arranged at the top of the rotating device; a fixing block is arranged at the top of the telescopic rod, a motor is arranged at the top of the fixing block, one side of the fixing block is connected with a sprayer support through a rotating shaft, a sprayer is arranged on one side of the sprayer support, the other side of the fixing block is connected with a water pipe, and one end of the water pipe is connected with a centrifugal pump located on the inner side of the device body. The equipment has the beneficial effects that aplurality of adjustable sprayers which are positioned on the sprayer support at equal intervals are adopted, so that the air quality can be regulated and controlled, a proper amount of water can be sprayed, the utilization rate of water resources can be improved, the waste of the water resources can be reduced, and meanwhile, excessive influence on pedestrians or machines due to excessive water mist can be prevented.

The invention discloses a high molecular spraying dust suppressant prepared based on a graft copolymerization method and a preparation method. The high molecular spraying dust suppressant comprises the following components in percent by weight: sodium alginate, caprolactam, acrylic acid, an initiator, a crosslinking agent, an antifreezing agent and the balance of water. With the sodium alginate as a matrix, a graft copolymerization reaction is performed on the sodium alginate and the caprolactam to obtain a liquid substance which can form gel after water loss and can form a film after air drying, then a proper amount of acrylic acid is grafted to increase the toughness and the stickiness of the gel and the film, and a small amount of antifreezing agent is added to improve the antifreezing performance of the dust suppressant; after the environment-friendly dust suppressant is sprayed onto a coal mine production site, dust can be enwrapped in spraying droplets, so that dust diffusion can be effectively reduced; the dust-enwrapped droplets fall onto the ground surface to form the gel after water loss so as to cover dust on the ground and form a shell film after being dried so as to seal dust particles falling onto the ground surface, so that the dust falling efficiency is improved, and the dust diffusion is reduced.

The invention discloses a large off-line ash removal bag-type dust collector which comprises a dust collector box internally partitioned into two channels. Each channel is internally partitioned into two chambers, each chamber is partitioned into an upper purified gas room and a lower smoke room through a tube nest provided with a plurality of filter bags in a perpendicular suspension mode, a pulse jet ash removing mechanism is arranged in each chamber, a gas inlet is formed in each lower smoke room, the gas inlets of the lower smoke rooms in each channel are communicated with one air inlet flue branch pipe at the same time, the two air inlet flue branch pipes are communicated with an air inlet flue main pipe at the same time, each air inlet flue branch pipe is provided with an inlet baffle door, automatic smoke balanced distributors are arranged on the air inlet flue main pipe and the smoke flow distributing parts of all the air inlet flue branch pipes respectively, the upper purified gas room of each chamber is provided with an air outlet, the air outlet of each upper purified gas room is communicated with an air outlet flue branch pipe which is provided with an outlet baffle door, and the air outlet flue branch pipes are communicated with an air outlet flue main pipe at the same time. The large off-line ash removal bag-type dust collector has the advantages of being high in dust removing efficiency.

The invention relates to a preparation method of a wet-type dust removal agent for reducing coal dust. The dust removal agent is prepared by adopting 0.02 to 0.20 percent by weight of anionic surface active agent fast seepage T (according to 100 percent by weight of solvent contained in a component A), 0.01 to 0.20 percent by weight of nonionic surface active agent, a solvent contained in a component B and 0.2 to 2.0 percent by weight of water retention agent (according to 100 percent by weight of the solvent contained in the component B), a mass ratio of the solutions contained in the component A and the component B is (1 to 3): 1. The preparation method of the dust removal agent comprises the following steps: adding the nonionic surface active agent into an anionic surface active agent solution, refluxing, stirring, and cooling to the room temperature to obtain the component A; adding the water retention agent into the solvent to obtain the component B, directly mixing and uniformly stirring the component A and the component B with the mass ratio of the contained solvents of (1 to 3): 1 at the room temperature; and spraying the wet-type dust removal agent at a coal mining site, so that a great amount of dust can be effectively reduced. The preparation method has the characteristics of low cost, non-toxicity and high efficiency.

The invention provides a building construction site dust suppression device. The building construction site dust suppression device effectively solves the problems that a conventional dust suppressionmode is large in manual labor amount, slow in effect taking, incapable of well meeting site requirements, inconvenient to mount and dismount, time-consuming, labor-consuming and low in construction efficiency. According to a technical scheme of the invention for solving the above-mentioned problems, the building construction site dust suppression device comprises a shell, wherein a first frictionwheel is arranged in the shell; a water pump is arranged in the shell; a second friction wheel is arranged on the water pump; a gears is respectively arranged at the left side and the right side of the first friction wheel; a friction disc is arranged at one side of each gear; a first annular plate is arranged in the shell; a rack is arranged at the lower side of the first annular plate; a waterbox is arranged at the upper side of the shell; the water box and the upper side plate of the shell are fixed through a lead screw; spray nozzles are arranged on the water box; a first cylinder is arranged at the lower end of the box body of the water box; a water valve is arranged on the first cylinder; and a cylindrical block sleeves the lead screw. The building construction site dust suppression device provided by the invention greatly reduces the amount of manual labor, can well adapt to site requirements, can adjust a spraying area, is convenient in dismounting and mounting and high in adaptability, and facilitates popularization.

The invention discloses a comprehensive treatment method of dust produced during coal cutting against wind by a coal cutter in a fully-mechanized coal mining working face. Firstly, a first spraying device is utilized to wet front and rear rollers of the coal cutter and nearby caved fragmentized coal bodies; then a dust blocking curtain, a second spraying device and a third spraying device are utilized to guide flying dust to move downward along one side of the coal wall; a fourth spraying device and a fifth spraying device are utilized to intensively and efficiently purify high-concentration dusty airflow guided to one side of the coal wall to move; and lastly, a sixth spraying device is utilized to settle the escaped dust. The whole dust falling efficiency reaches 90% or above, the respirable dust falling efficiency reaches 85% or above, and finally the effective treatment of the dust during coal cutting against wind by the coal cutter is achieved.