Device for injection airing of bottomholes of blind drift
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.
The invention relates to the field of mining industry and can be used for ventilation stub faces of excavations at tunneling work in underground mines and the mines.
In underground mines and mines to ensure the front of the sewage treatment works annually a large number of preparatory, rifled and drilling openings, the ventilation which is injection method with the use of local ventilation fans and ventilation pipes.
The used means of ventilation have certain disadvantages. So, when blasting occurs the destruction of the bottom level of the vent pipe due to its location near the bottom (according to the requirement of item 142 "Uniform safety rules for the development of ore, rock and gravel deposits underground" PB 03-553-03 and "Rules of safety in coal mines" PB 05-618-03 distance from the end of the vent pipe to the bottom is limited to 10 m)due to the small range of the jet of air from the low speed to the expiration of the duct. The used means of ventilation does not provide suppression of gas and dust formed in the face during tunneling, mining or blasting, which leads to pollution of the atmosphere as ventilated generation, the AK and other workings, located in the direction of the outgoing stream.
A device for injection ventilation stub faces not gassy mines (A.S. No. 308209, E21F 1/00), including fans, becoming the vent pipe and the confuser, in which the confuser is made with the guide bars and is equipped with a mixer.
The disadvantage of this device is that the stream of air supplied from the confuser, washes away from the bottom space of the explosive gases and dust from lack of speed and quality, concentrations that exceed health standards, resulting in the pollution of other workings in the direction of the outgoing stream.
Closest to the proposed technical solution is the device for injection airing faces a dead-end workings (A.S. USSR №941617, publ. 07.07.1982, including the confuser, has a flange, and the nozzle includes an internal annular chamber, a nozzle for compressed air in said chamber and strainer.
The disadvantage of this device is uneven feeding of compressed air around the circumference of the chamber, which reduces the effect of creating a vacuum in the confuser, helps reduce the air flow rate is not providing effective dust suppression and liquefaction of gases, and also very complicated cleaning of the filter is, requiring complete separation of the confuser from the nozzle.
Unified technical result of the proposed technical solution is to increase the efficiency of ventilation by increasing the distance of 20 m or more from the end of the vent pipe to a standstill slaughter preparatory workings and quality dust suppression and expulsion of gas directly in the focus of their education.
Unified technical result is achieved by the fact that in the known device for injection airing dead end faces of excavation, consisting of a confuser, has a flange, the nozzle including an inner annular chamber and fitting for compressed air in said chamber, the end portion of the inner surface of the nozzle adjacent to the flange, has a spherical surface, and at the junction of the nozzle flange is formed a circular slot, while the compressed air is produced through the nozzle and strainer in switchgear with evenly placed additional holes around the circumference of the nozzle body in the annular chamber, the diameter of the nozzle is larger than the diameter of the additional holes and fitting for water supply is installed in the outlet part of the confuser.
Feature of the device is compressed air supply (pressure from 0.5 to 1.0 MPa) in the density of the y, and water supply in the confuser. Proper functioning of the device is governed by the width vozduhovydajushchemu annular gap, which is 0.15-0.20 mm and is formed by an end face of the nozzle and the intermediate flange (adjustable gasket). To prevent the clogging of the annular mechanical impurities in fitting for compressed air has a sieve. Install a strainer in the fitting and fastening his retaining ring provides quick removal and cleaning from mechanical impurities. For the supply of water into the internal cavity of the device confuser is supplied to the output part of the fitting.
The inclusion of the device is carried out jointly with local ventilation fan. Compressed air under pressure is supplied to the device is flowing from the annular chamber expands and rushes toward the end of the slice nozzle, creating in the inner cavity of the nozzle of the vacuum, increasing the pressure drop in the pipeline and providing additional volume of air through the receiving part of the confuser. Water flow in the air flow formed in the confuser, provides for the creation of fine water-air mixture which enters the hearth dust and gas ventilated framing.
Device to transfer handles, which also used the together with eye bolt for installation in the mine workings.
The specified technical solution is illustrated by drawings, where figure 1 shows a longitudinal section of the device of figure 2 - ventilation scheme stub bottom of excavation with the use of the device, figure 3 - General view of the injection device airing dead end faces of the mine workings.
Device for injection ventilation openings dead end faces of the mine workings (see figure 1) consists of a confusor 1, flange 2 and the nozzle 3, includes an internal annular chamber 4 and the nozzle 5 for supplying a compressed air into the chamber 4. To prevent the clogging of the annular gap 7 mechanical impurities in the nozzle 5 for supplying compressed air has a sieve 8 recorded from falling out retaining ring 9.
End portion of the inner surface of the nozzle 3, adjacent to the flange 2 has a spherical surface. At the junction of the nozzle 3 with the flange 2 by means of bolts through the gasket is formed an annular gap 7. For the supply of water into the internal cavity of the device confuser 1 is supplied to the output part of the fitting 6. To transfer the device is equipped with handles 10, which are also used in conjunction with eye bolt for installation in the mine workings.
Operation pressure ventilation stub faces mining is carried out as follows : the m (see 1). The compressed air in the vent line enters the confuser 1. Simultaneously in the annular chamber 4 of the nozzle 3 through evenly distributed additional nozzle orifice 3 is supplied compressed air passing through the annular gap 7, high speed flows in the inner spherical cavity of the nozzle 3, creating a depression in the confuser 1 facilitating and fence extra volume of air flow through the receiving part confuser 1. Proper functioning of the device is governed by the width vozduhovydajushchemu annular gap 7, which is 0.15-0.20 mm water Flow in the air flow formed in the confuser 1, is carried out through the nozzle 6, is provided by the creation of fine water-air mixture which enters the hearth dust and gas ventilated framing.
Ventilation scheme stub bottom of excavation with the use of the device shown in Fig. 2. The device 11 is connected with the vent discharge duct 13 through the castle of the clip 12. Using rubberized sleeves 14 and 15, the device is connected to the compressed air lines and water. The air and water pressure is regulated by the valves 16, 17. The local ventilation fan 18 is attached to the duct 13 in the formulation for the pair from a member who true, created at the expense of mine depression.
The operation of the device is as follows (see figure 2). The local ventilation fan 18 pump fresh air through the duct 13 to the device 11. At the same time through a fitting located on the device served by the sleeve 14 compressed air, which creates a vacuum in the device 11, which increases the pressure drop in the pipeline and to ensure the delivery of additional air volume. To combine the process of ventilation with a simultaneous suppression of dust into the internal cavity of the device 11 through the sleeve 15 serves water. As a result of interaction with a jet of compressed air is formed finely dispersed water-air mixture, which fills the bottom space on the length up to 20 m over the whole cross section generation. Due to this, along with the leaching of explosion products, there is an intensive wetting and deposition of dust directly into the bottom space is the liquefaction of natural gas.
Technical characteristics of the device for injection airing dead end faces of mines
|Area ventilation and dust suppression is not less than, m||20|
|Performance under pressure satoh the air 0.5 MPa, m3/min||100|
|Compressed air consumption, m3/min||4,5|
|The width of the annular gap, mm||0,15-0,20|
|Water consumption no more l/min||30|
|The noise level not more, dB||80|
|The effectiveness of dust suppression is not less than, %||80|
Tests of prototypes of the device were conducted at the mines Tashtagol and Sheregesh Deposit mines of OAO Evrazruda when drilling haulage vectors, drift and drilling openings.
As a result of application of the device pressure ventilation stub faces in mines achieved important social and technical-economic effects: increased security maintenance of underground mining operations and work culture; reduced by 20-25% of the time airing with mine sinking; increasing the distance from the end of the duct to a standstill slaughter Virab the current to 20 m, this ensures that the duct when blasting; provided (along with effective ventilation) dust suppression and liquefaction of gases directly into the rock by blasting and tunneling operations, and thereby improve the sanitary and hygienic working conditions; increasing the amount of feed in the bottom of the air in the 1.2-1.4 times by reducing the resistance network; increasing the flow rate of the jet of air from the end of the vent pipe in 2-3 times. The economic effect is from 3.0 to 5.0 thousand rubles per 10 m of tunneling excavation.
Device for injection airing dead end faces of excavation, consisting of a confuser, has a flange, the nozzle including an inner annular chamber, fitting for compressed air in said chamber, a strainer, characterized in that the end part of the inner surface of the nozzle adjacent to the flange, has a spherical surface, and at the junction of the nozzle flange is formed a circular slot, while the compressed air is produced through the nozzle and strainer in switchgear with evenly placed additional holes around the circumference of the nozzle body in the annular chamber, the diameter of fitting larger the diameter the more holes, and fitting for water supply is installed in the outlet part of the confuser.
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
SUBSTANCE: system includes pit shaft with air-sound channels, ventilation and noise silencer chambers and ventilation stall. Stall is attached to pit shaft by means of the pipeline piece built in the building located above the underground structure. Between ventilation and noise silencer chambers there installed is elastic diaphragm with an opening.
EFFECT: reducing noise level by means of multi-staged silencing.
SUBSTANCE: invention relates to mining, in particular - to a method for removal of dust and gas from the breakage heading in case of room-and-pillar development system. It involves supply of fresh air to the bottomhole zone with a draught source generating a vortical circulation circuit. On the one side of the circuit one performs supply of fresh air while on the other side one performs removal of contaminated air from the bottomhole zone. The draught source is placed in the bottomhole zone. It creates the first circuit of circulation vortical motion and generates a directed air flow, contaminated with dust and gas, along the wall of the excavation opposed to the miners' workplaces. At the spot of the first vortical circulation circuit connection to the following vortical circuit a linkage is driven that connects the excavation wherein cleaning works are performed to the exhausted chamber. An additional draught source installed in the exhausted chamber may be equipped with an air duct.
EFFECT: method enables intensification of ventilation in an excavation wherein cleaning works are performed and miners are present and at the place of connection of vortical circulation circuits where occurs accumulation of dust and gas clouds which improves sanitary and hygienic conditions of mining workers labour.
2 cl, 1 dwg
FIELD: technological processes.
SUBSTANCE: invention may be used in mining industry. Separator intended for separation of coal bed gases is placed in cavity of mine. Hydrocarbons separated in separator are exhausted via gas line, and volume of gases discharged from mine is substituted with atmospheric air. Separator comprises body with nozzle of gas inlet 14, nozzle of light gas discharge 12 and nozzle of heavy has discharge 1, engine 20. In toroidal cavity 5 of separator body there is radial-axial centrifugal compressor installed with hollow blades, in which frontal slots 1 and rear slots 2 are provided. Propeller 10 is fixed on tubular extension of shaft 11. To inner surface of propeller 10 there are blades of radial-axial centripetal compressor 9 fixed.
EFFECT: efficient separation of heavy and light gases, reduction of power inputs for air conditioning in mine.
3 cl, 6 dwg, 2 tbl
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