Installation for blowing ventilation of dead working faces
SUBSTANCE: installation includes fan, delivery line, inducing and water-spraying device installed on its end. Inducing and water-spraying device includes outlet head with annular outlet slot, receiver and compressed air supply nozzle. In order to increase energy use efficiency of compressed air owing to active mixing of inducing and induced jets, separation effect of inducing jet from convex surface is used in inducing and water-spraying device. Common air jet is passed through two-layer fine-meshed screen before it is emitted to atmosphere of mine working. In order to protect outlet slot against deformations, at HWL (high-water level) impact, inducing and water-spraying device is equipped with deformation-proof flange. Water supply nozzles to inner cavity of the main diffuser are installed on convex surface of the main diffuser at angles of 120 degrees to each other.
EFFECT: higher use efficiency of compressed air energy.
4 cl, 2 dwg
The invention relates to the field of mining industry and can be used for ventilation of dead-end faces of the mine workings.
Known device for injection airing dead end faces of mines [Ed. St. No. 661113, 1979, E21F 1/08], including local ventilation fan (VMP), injection pipe (NT) and ejecting-water spray device, consisting of a confuser, fitted with a venting screw (ring nozzle, made in the form of a profiled sleeve) with the receiver (with an internal annular cavity), the outlet slit formed through the gasket between the flange and the annular sleeve, a convex surface and fittings for compressed air and water.
Known for a series of dependent [Ed. St. No. 661113, 1979, E21F 1/08] modifications, for example, [Ed. St. No. 846757, 1981, E21F 1/08, Ed. St. No. 941617, 1982, E21F 1/08, Ed. St. No. 1167350, 1985, E21F 1/08], ejecting-water spray devices which contain the same details.
All known plants, namely their ejecting device suffers from two drawbacks: one is obvious; the second is hidden.
1. The discharge gap is in the vicinity of the slice discharge head (cut profiled sleeve) - side stub of the face. In the air stream moving inside the NT under the action of the FMP that have formed (that is bulentnba) plot speed, falls in the region of acceleration, caused partly by the narrowing of the cross section due to the presence of confuser, but mostly because of the vacuum in the discharge head due to peripheral expiration of compressed air from the outlet slit and loses the previous plot, because the speed of the internal walls of the exhaust head (ejecting speed of the jet) is many times higher than the rate on the flow axis (the speed of the ejected jet). To align the plot of the total speed of the jet over the desired area of the pipe (the mixing chamber) length not less than 3 meters (better diffuser) or hydrodynamic lattice in the flow path. All the known devices do not. Aerodynamically unformed stream immediately available in an open space development, which does not allow the coefficient of performance (COP) of the device to achieve a higher value by making the energy of compressed air for more work on the mixing of jets in the formation aerodynamically normal plot of speed before the release of the total flow in the atmosphere.
2. All known ejecting-water spray device (confuser with ejecting the nozzle and pipe for water supply) massive - 25-30 kg the Authors rightly believed that the massive device less susceptible to shock the air waves (UVV). Currently, the number in rawimage explosives (he), when drilling stub generation, up to 24 kg (10 kg) and UVV formed of such size, where beats outlet head on the wall of the excavation of the deformation of a thin (0.15 mm) exhaust cracks, which leads to uneven release of compressed air along the perimeter of the slit, for violation of concentric uniformity of the flow and, eventually, also to decrease the efficiency of the device.
The task of the invention is to increase the energy efficiency of compressed air by providing a hydrodynamic normalization plots the total speed of the jet produced in open space develop towards the dead-end face of thesis cracks from deformation when exposed to UVV by confuser rejection and use of profiled diffuser, equipped with protivodetonatsionnuyu the flange.
The problem is solved in that massive, but fundamentally unnecessary confuser refuse at all, and jet HT, accelerated by the negative pressure in the exhaust head, not released immediately into the atmosphere of the mine workings, and passed through the receiving cone, passing through the convex surface in the main diffuser provided at the output of a two-layer aerodynamic grid. The length of the receiving cone is chosen such that the entraining stream it managed to grow in the transverse size of the and the expense of air leaks from the jet HT to the size of the radius of curvature of the convex surface [Zelenetsky VA, Chirkov US ABOUT unseparated gas flow on a convex surface. / Journal of mining science, No. 1, 1989, S-79], then when moving on the surface of the jet separates the centrifugal force inside the jet HT, mixed with it in the main cone, and after passing the flow through a two-layer wind grid expire in the atmosphere with the hydrodynamically normalized (turbulent) velocity profile. Jet with monochromatic turbulent structure has a greater efficiency of energy use compressed air, than in the prototype and its dependent counterparts, as does a greater job of transferring energy and momentum from the entraining jet ejected to mainly the diffuser, the role of the mixing chamber.
Both the diffuser is equipped with flanges that connect by means of bolts through the rubber gasket. The outer diameter of the flange exceeds the external diameter of the discharge head. Thus, the connection represents protivodetonatsionnuyu the flange. The first blow against the wall framing from exposure to UVV on the device receives the flange, thereby protecting the discharge head with a thin slit prom from the strongest impact UVV.
The operational advantage of the proposed device is that it weighs 15 kg less than the mass of the device in A.S. No. 661113 primarily for accounts is not using confuser (to use the confuser is suitable only as a passive accelerator). As the main diffuser, you can use a standardized fire-fighting foam generator, the average multiplicity GPS-600 equipped with a flange.
The water in the inner cavity of the main cone, if necessary dust suppression at the bottom, flows through the fittings mounted on the convex surface at angles of 120 degrees to each other.
Mount HT to the proposed device is provided in the recess formed by the junction of the discharge head with the receiving cone.
Figure 1 shows schematically the proposed installation; figure 2 - node I.
The installation includes the fan 1, the pipe 2, the ejecting device 3 consisting of the discharge head and profiled diffuser. The discharge head is formed by bolting 4 flange 5 with the sleeve 6, containing an internal toroidal cavity 7 and the convex surface 8 through the gasket 9 for the formation of the outlet slit 10, and the discharge head includes a nozzle 11 and a pipe 12 for supplying compressed air into the cavity 7 and the retaining ring 13. Profiled diffuser formed by the serial connection of the receiving 14 and base 15 of the diffuser by means of screw connection 16 of the flanges 17 and 18 through a rubber gasket 19. The cone 15 has a convex surface 20 and includes a socket 21 for the supply of water in its internal cavity, and the grid 22. Established the e diffusers to the flanges and to the outlet of the cylinder is carried out by welding.
Installation for pressure ventilation stub faces is as follows.
Fresh air is sucked in from vozduhopodajushchej generation fan is supplied by pipeline to the bottom stub generation. Passing through the ejecting device, a jet fan undergoes acceleration caused by the discharge generated in the discharge head, expiring at high speed (up to 200 m/s) from the exhaust slots with compressed air. A thin jet of compressed air around the convex surface of the exhaust head, rushes into the receiving cone along its walls, podstava air from a jet fan and increasing in transverse dimension, reaches the convex surface of the base of the cone, it starts to round, but the radius of curvature of the convex surface is chosen such that when the centrifugal force tear parietal stream, discarding it inside a jet fan. Next, in the main diffuser both streams (ejecting - wall and the ejected - jet fan) actively mixed and passing through the multi-layer, fine mesh, fulfilling the role of hydrodynamic lattice, the total jet with monochromatic turbulent structure expire in space generation towards the dead-end face. This jet is the most stable and long-range.
The presence of three nozzles 21 which allows to organize the flow of water, which gives the most effective suppression of fine water-air mixture.
Use ejecting device at the discharge end of the vent pipe equivalent to a reduction of the aerodynamic drag, which allows to increase the flow rate of the air supplied to the slaughter, 1.5 or more times and, consequently, to increase the distance between the end of the pipe and slaughter.
1. Installation for injection airing dead end faces of excavations, including the fan, the discharge line, ejecting water spray device containing the discharge head with the annular outlet slot, the receiver and the socket for the supply of compressed air, which is installed on the discharge end of the pipe and serves to release the total flow in the atmosphere of excavation in the side of the dead-end face, characterized in that for the normalization plots the total speed of the jet ejecting water spray device includes two profiled diffuser formed by the serial connection of the reception and the main drivers, while receiving the diffuser passes through the toroidal convex surface in the main diffuser provided at the output of a two-layer fine mesh mesh, and the length of the receiving cone such that eject the dominant stream it manages to grow in the transverse size by drawing air from the jet discharge to the size of the radius of curvature of the convex surface, that provides separation jet ejecting from the convex surface, its garbage to the center of the stream and further mixing with the ejected jet in the inner space of the main cone.
2. Installation according to claim 1, characterized in that the entraining water spray device has protivodetonatsionnuyu the flange formed by the flanges and receiving primary diffusers connected through a rubber gasket, and the outer diameter of the flange exceeds the external diameter of the discharge head.
3. Installation according to claim 2, characterized in that the convex surface of the main diffuser installed at angles of 120° to each other fittings for the supply of water into the internal cavity of the main cone.
4. Installation according to claim 3, characterized in that the recess formed by the junction of the discharge head with an acceptance cone, attach the discharge pipe.
SUBSTANCE: protective lock comprises a box with hinges, a rigid web mounted in box hinges with the possibility of rotation in the horizontal plane, a seal of elastic material arranged between the web and the face surface of the box, a mechanism of web rotation and a locking mechanism. The lock is also equipped with an additional seal made as a hollow ring with a source of compressed air. On an inner surface of the box there is a support platform. The additional seal is installed between the box and the web.
EFFECT: increased reliability of underground facility protection with simplification of lock design, provision of economic efficiency in process of manufacturing and operation of the lock.
2 cl, 5 dwg
SUBSTANCE: according to the method, the body is installed in the input cross-section of a mine, its mass is measured, a fixed air medium is installed in the mine, the mine length is measured, as well as angle of its inclination, the body is imparted with a possibility of movement in the air medium. The specified mass flow of body movement is measured, as well as the air medium movement speed that corresponds to it, their possible limit deviations from the specified values are identified. In case there are deviations, the body length is measured, as well as its midlength section, volume and shape. Their respective values are identified in the output cross-section of the mine. The mass flow of the body and the speed of the air medium movement are varied. Mass flow rates of the body and the air medium are measured in the output cross-section of the mine, as well as the specific densities of the volume flow rate of the air medium, corresponding to the mass flow rates of the body, parametres of their variation modes are determined, as well as the specific density of the air medium, and the initial aerodynamic force of the body is specified. The aerodynamic force of the body in the air medium with the variable mass speed of the body is determined in the output cross-section of the mine, at the specific density of the volume flow of the air medium and various parametres of their variation modes using given mathematical formulas.
EFFECT: increased accuracy of aerodynamic force detection and improved validity of air flow supplied into the mine.
SUBSTANCE: device comprises confusor, intermediate flange and nozzle, including inner circular chamber and nipple for supply of compressed air into chamber. Screen filter fixed against falling out with a stop ring is installed in nipple for compressed air supply. End part of inner surface of nozzle that adjoins flange has spherical surface. In area of nozzle connection to flange with the help of bolts a circular slot is formed due to gasket. To supply water into inner cavity of device, confusor is equipped with nozzle in outlet part. Device is equipped with handles for transportation.
EFFECT: improved efficiency of airing due to increased distance up to 20 m and more from end of airing pipeline to blind bottomhole of developing entries, dust suppression of high quality and gas dilution directly in focus of their formation.
SUBSTANCE: proposed installation comprises blower with nozzle arranged in underground recirculation channel, bulkhead and shell with self-sealing valve. Aforesaid shell is arranged in crosswise wedge-like bulkhead along underground recirculation channel that communicates air feed and vent channels. Gaps between shell and aforesaid bulkhead are sealed. Aforesaid blower is arranged on one side of the shell, while on other side a self-sealing valve is fitted. In partial air reuse, said valve is open, while in changing into airing conditions with recirculation, said valves shuts off the shell. Support bulkhead is mounted at intersection of air recirculation and ventilation channels. Ventilation or recirculation channel accommodates sensors that serve to control quantitative and qualitative parametres of recirculated air and installation overall control unit.
EFFECT: higher safety, reliability and efficiency.
7 cl, 2 dwg
FIELD: process engineering.
SUBSTANCE: proposed method comprises controlled air inflow. Note here that said controlled air inflow occurs between first and second stages of the fan.
EFFECT: lower power consumption.
FIELD: machine building.
SUBSTANCE: device is equipped with autonomous sub-system of control over separate ventilating installation. The sub-system consists of a mode setting block, of an electric engine smooth start-up block, of a control block, outputs of which are connected to inputs of actuators of working wheel blades turn and turn of the gate of the ventilator, of sensors of working wheel blades position and gate position and of a metre of current voltage or electric engine exciting current. The device is additionally equipped with autonomous sub-systems of control over separate ventilator installations. Each sub-system contains an actuator for control over brake, the input of which is coupled with the output of the control block, pressure and brake gauges and a micro-processor controller including a "driving-driven" mode switch block, an input-output module and a micro-processor module. The outputs of the sensors of working wheel blades position, gate position, feed voltage or electric engine exciting current, gauges of pressure and brake are connected with corresponding inputs of the input-output module. The block for electric engine smooth start-up of each autonomous sub-system is made in form of a combined block of a smooth start-up-adjustment of excitation (SSB/EAB). The latter is used as a block of smooth start-up with phase control at application of an a-synchronous electric engine and as a block for adjustment of excitation current at application of synchronous electric engine of the ventilator. The microprocessor controller is coupled with the electric engine of the ventilator via the module of input-output and SSB/EAB.
EFFECT: increased reliability of control over installations containing several ventilator aggregates with a-synchronous or synchronous electric engines.
2 cl, 1 dwg
SUBSTANCE: method includes air supply from main mines along panel transport mines to block transport mines to areas of mining works and removal of spent air from bottom hole through split chambers in block ventilation mines to panel ventilation mines further to main ventilation mines, at the same time part of spent air from panel ventilation mines through blocks, where treatment works are not carried out, recirculates to block ventilation and split mines, and also through block transport mines, to panel transport mines with the help of additional recirculating ventilation plants located on panel and block mines, where mining works are not carried out.
EFFECT: lower risk of contaminated air accumulation in mined-out space, provision of stable microclimate in areas of mining works and reduced costs for ventilation.
SUBSTANCE: long blind drift ventilation method involves drilling of the main and additional wells in a pillar between adjacent and blind drifts; development of the cavity connecting the main and additional wells; air supply via the main well from fan or other draft source from adjacent drift to blind one; air ejection via additional wells from adjacent drift to blind drift. For more qualitative mixture of active (inducing) and passive (induced) jets the created cavity has bigger length and is made in the form of cone - diffuser.
EFFECT: increasing the jet head, flow continuity and its hydrodynamic stability, increasing system ejection coefficient.
SUBSTANCE: method for ventilation of development entries by way of slanting horizontal wells bored from the surface involves delivery of fresh air into the well due to general shaft depression and discharge of the outgoing air stream along main entries and the well. The shaft of the slanting horizontal well bored from the surface is positioned within a protective pillar between coupled development entries being arranged; discharge of the outgoing air stream from the development faces is performed through the breakthrough closest to the faces that intercepts the well shaft and with the help of a vacuum pump installed on the surface at the well mouth.
EFFECT: provision for independent ventilation of coupled development entries and extraction faces and reduced scope of full-faced entries being arranged.
SUBSTANCE: fresh air is supplied into mining face due to general shaft depression along two courses that delineate extraction pillar. It is discharged along course maintained behind mining face. In zones of active gas release of approximate beds, air impermeable throughput brattices are erected to form gas draining chamber. Part of stripped area adjacent to the latter is zone of methane trapping. Flow of air-methane mixture is formed. One part of flow is drained along gas-draining course into outward line of extraction site. The other one is discharged from stripped area outside the limits of extraction site. Between mining face and zone of maximum gas release of developed bed an additional throughput brattice is installed. The other part of air-methane mix flow is pushed aside in the area of impact of throughput brattices of gas draining chamber in direction of developed bed unloading zone arrangement. Flow of air-methane mix pushed aside is captured in wells for degassing. They are drilled in advance to form gas-draining chamber from maintained course into zone of developed bed unloading. Mouths are arranged behind project area, where gas draining chamber throughput brattice is erected. Bottoms are arranged in zone of maximum gas release of developed bed. Additional throughput brattice is initially installed in course maintained behind mining face in area, where its vertical plane matches vertical plane passing through point, which is projection of bottom in the well nearest to mining face for degassing onto ground of stripped area, and line being perpendicular drawn from specified point to the limit between maintained course and stripped area. As mining face advances, it is displaced in direction of extraction pillar development.
EFFECT: increased efficiency of methane removal, provides for the possibility to create reserve for increased load at bottom.
4 cl, 7 dwg
FIELD: mining industry.
SUBSTANCE: pipeline has sections made in form of hermetically interconnected outer and inner covers, mounted with space relatively to each other, and main ventilator. On different ends of pipeline flow meter and additional ventilator are mounted, the latter having adjustable characteristics and being connected to inter-pipe space by branch pipe. In inner cover apertures are made placed along radius and along length of cover. Air comes from apertures to air channel and forms additional air flow near walls of inner cover, which lowers or heightens aerodynamic resistance of ventilation pipeline.
EFFECT: higher efficiency, higher safety, lesser costs.
FIELD: mining industry.
SUBSTANCE: method includes use of screw-drilling machine for driving of several first ventilation shafts in ore body and driving several second shafts, while second and each second shaft crosses, at least, one matching first shaft, forming first support walls, supporting ceiling. First supporting ceilings consist of ore body zones between neighboring second shafts, each first support wall has portion of at least one first shaft, passing horizontally through it. Horizontal channels are formed, each of which is placed transversely to matching second shaft between appropriate portions of first shaft, formed in adjacent support walls, for forming of group of continuous ventilation shafts. Second shafts are filled for forming second supporting walls, supporting well ceiling, and first supporting walls are extracted. First ventilation shafts can be made parallel to each other. Second shafts may be directed perpendicularly relatively to first ventilation shafts. In ore body air-outlet and air-inlet ventilation mines can be formed, placed at distance from each other along horizontal line, while first or each first ventilation shaft passes through portion of ore body between air-inlet and air-outlet ventilation mines. Driving of second or each second shaft can be performed by cutting machine, or by drilling or explosive mining.
EFFECT: higher efficiency.
7 cl, 11 dwg
FIELD: mining industry.
SUBSTANCE: device has working and reserve ventilators, placed in ventilator chamber. By means of connecting channels ventilators are connected to air-conducting and air-draining channels, which com together in triple-output branch pipes, connected via ventilation channels to general mine ventilation network. Ventilation chamber is separated from air-conducting channels by longitudinal vertical wall. Air-conducting channels are made in form of one mine, separated by longitudinal horizontal wall between triple branch-pipes. Means for reversing air flow are mounted in branch pipes. In connection channels on force or suck-in side of ventilators cutting means are mounted. Assembling drift is connected to end of ventilator chamber.
EFFECT: higher safety, lower costs.
FIELD: mining industry.
SUBSTANCE: device has working and reserve ventilators, each of which has diffuser with rotary branch pipe, electric engine, connected to ventilator by transmission shaft via toothed sleeves, and devices, covering input and output of ventilator. Additionally plant is provided with doubled input box, made in form of mated individual boxes of working and reserve ventilators by rotating these to face each other relatively to vertical planes, passing through axes of ventilators rotation. Side inner walls of ventilators form up a common rib, on which axis of special piece is placed, in turns covering branch pipes of input boxes of working and reserve ventilators. When using ventilator plant near residential or administration buildings its output box is provided by muffler and cowl, and output branch pipes of ventilators are provided with controlling blades.
EFFECT: lower costs, higher durability.
2 cl, 4 dwg
FIELD: mining industry.
SUBSTANCE: method includes feeding fresh air along air ducts due to generic depression, and output stream is taken partially through supported mines due to generic depression and partially - through extracted space of extracted or previously extracted column by means of gas-sucking plant. Methane support control in fresh and output streams is maintained. From the surface into air duct a ventilation shaft is drilled and additional fresh air is fed therein in same direction with main stream. Adjustment of methane containment in air streams at extraction portion is performed by changing amount of air, fed additionally.
EFFECT: increased volume of fed fresh air without substantial reconstruction of ventilation system.
1 dwg, 1 ex
FIELD: mining industry.
SUBSTANCE: device has air feeding channels, positioned between support and coal massif and ventilator with pipe for sucking air away. Additionally device is provided with curtain of transparent plastic profiles with load, positioned in lower portion of curtain, positioned on carrying ropes, connected to driving drum. The latter is held on ceiling of support section and provided with electric drive with automatic and manual control. Lower portion of curtain enters a space, formed by walling of cable packer and grating. Ventilator, moved with extraction of coal massif, is positioned in ascending air stream in ventilation drift. Width of curtain equals width of support section, and length is in 1.3 times greater than vertical height of support.
EFFECT: higher efficiency.
FIELD: mining industry.
SUBSTANCE: device has air-intake channels and ventilator with air sucking pipe. Each air-intake channel is made in form of flexible plastic pipe with gate, placed on lower side of ceiling of support section or in ceiling body in parallel to its longitudinal axis. One end of air-intake channel is positioned at same level with working end of ceiling, and second one is connected to air sucking pipe, held below support section ceiling behind combine in parallel to axis of scrapping conveyer. Ventilator is mounted on mating support on out-flowing air stream. Flexible plastic pipes are made having U-like shape with crosspiece perforated along length, positioned along working edge of support section ceiling. Also, air-intake channel is provided with subs, each of which is made of two intertwined parts, mounted on rotation axis, separated by air-impenetrable insert. Subs and ceiling are interconnected with possible rotation of subs relatively to ceiling, and axis of subs is displaced relatively to axis of joint of support section ceiling and is parallel to it.
EFFECT: higher personnel safety, higher efficiency.
FIELD: mining industry, particularly ventilation of mines or tunnels during bauxite deposit development.
SUBSTANCE: method involves supplying pure air from field haulage roadway through blind drift of transport horizon into ore rising one due to mine depression; feeding part of air from rising horizon in intermediate blind drift; directing remaining pure air in layered air supply drift and then to entry ways for venting thereof; removing contaminated air through previously developed entry ways in layered venting drifts arranged in exhausted space at deposit ground along the strike; directing contaminated air through venting rises arranged in exhausted space along block boundaries at deposit ground to field venting drift drilled under deposit ground along the strike at venting horizon level and blind drift of venting horizon to field venting drift; supplying pure air from intermediate blind drift to field rise and then to field venting drift through blind drift of venting horizon. Intermediate blind drift and field rise are adapted to evacuate miners in emergency conditions.
EFFECT: increased efficiency and miner's safety due to changing pure and contaminated air mass flow within the boundaries of the block.
FIELD: mining industry, particularly to form venting system, which controls thermal mine conditions during combined mining.
SUBSTANCE: method involves forming overburden haulage inclined out of the pit extending across the strike up to interface between exposed and underground mines; extracting mineral from the haulage; constructing venting means and mounting support in approach mine; erecting heat-exchanging mines during opened mining.
EFFECT: elimination of time intervals during venting system construction and mining performing, simplified people evacuation in emergency and possibility to use heat-exchanging mines for other purposes.
FIELD: mining, particularly to vent ore and rock mines.
SUBSTANCE: method involves mixing fresh and exhaust air by blasting fuel mixture; forming suction jet, which discharges exhaust air outside the mine. Fuel mixture components are supplied by compressed nitrogen. Air mixing is performed with the use of mixture including sodium permanganate and hydrogen peroxide taken in ratio of 1:(3-10). The suction jet is formed by exhaust air ejection. Venting plant is arranged at bottom mine level. Device comprises body with nozzle arranged over fuel mixture and control panel. The device additionally has nitrogen, sodium permanganate and hydrogen peroxide vessels. Venting pipeline is secured to body nozzle. The venting pipeline is provided with jets to supply hydrogen peroxide and sodium permanganate connected with compressed nitrogen cylinder through control panel. The venting pipeline is composed of separate sections put one on another and provided with conical flares. The flares and adjacent sections define annular air suction slots.
EFFECT: provision of independent operation, simplified structure, increased operational safety and reduced power inputs for mine venting.
1 cl, 1 tbl, 2 cl