Recirculation ventilation installation

FIELD: mining.

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

 

The invention relates to the mining industry and can be used in the ventilation systems in mines underground structures (tunnels, subways, mines, etc.) in the schemes of ventilation with partial reuse of the air.

Famous fan, which consists of primary and secondary fans, equipped with nozzles, and the nozzles are installed coaxially with the shell. Between the walls of the excavation and the sides with a jumper (the Russian Federation No. 2138648; MCI E21F /08; publ. 27.09.1999,, bull. No. 27).

A disadvantage of the known fan installation is a possibility of leakage of air through the cowling when the fan stops.

The closest in technical essence and the achieved result of the present invention is a fan recirculation system, consisting of fan, located in the mine workings and oriented in the direction vozduhopodajushchej production, ejecting channel in the form of a shell located between the two bridges, the gap between the cowling and the jumper sealed, sealing gaps between the shell and the jumper can be made of elastic material, one side of the shell has a working fan and the other end of the shell covered OTS is flowing valve, which can work in both automatic and mechanical modes, work fan and cowling installed on the frames and lintels in connection with the sides have metal tubes (U.S. Pat. Of the Russian Federation No. 2350753; IPC E21F 1/08; bull. No. 9, publ. 27.03.2009).

The disadvantages of the known fan recirculation system are:

the inability to shut off the valve in an automatic and often in the mechanical modes in case of accidents (e.g. fire or explosion), when there is a power outage in the mine and to the location of the fan recirculation setting no access and approaches to control room or to the flap gassy. When this occurs uncontrolled air leakage, which can exacerbate the consequences of the accident;

- impossibility when working recirculation fan installation to maintain the frame shell and the junction of the confuser and of the cone and the cylindrical part of the shell, as the valve opens (at work) in the direction of the passage and completely overlaps it;

- excessive investment - two tight jumpers;

- the complexity of installation of jumpers that need to be erected around the lateral perimeter framing on both sides of the shell and having high strength and reliable sealing;

- working fan mustache is anouki works protionamide with other sources of thrust, located in the ventilation network, as a result of its technical and economic performance is low;

- no ejection effect in the ring when the above is equivalent to the ventilation network, which operates the fan recirculation setting, less than 2 m2. In the shell arise jet air flow and overall performance of the fan recirculation setting is smaller than the supply of operating the fan.

The technical result of the invention is to improve the safety, reliability and efficiency ventilation of underground structures.

This technical result is achieved by the fact that the fan recirculation apparatus consists of a source of traction, shell, jumpers, with sealing gaps between them, with one side of the shell is the source of power, but on the other hand set valve all equipment is located in the recirculation channel in the direction from the ventilation duct to the intake channel and mounted on poles, sides made of one or several parts, and jumper, which has a shell made wedge-shaped and overlaps the cross-section of the recirculation channel, and valve made of self-compacting, when this fan recircu alonna installation is further provided with a retaining jumper, which is installed in the pair recirculation and ventilation ducts throughout its height.

Fan recirculation installation mounted either at the stake, or on the Islands of self-propelled equipment or on the tables. The source of thrust has one or more fans mounted cascade and configured in series and / or parallel operation. Shell consisting of several parts, includes: a mixing chamber and inlet nozzles, or the mixing chamber and outlet nozzles, or the mixing chamber with inlet and outlet nozzle, and the output of the nozzles is made in the form of a cone, and the length of the self-sealing valve exceeds the diameter or height of the cross section of the shell or cone, and the diameter of the outlet nozzle is equal to or less than the diameter of the mixing chamber and the diameter of the inlet nozzle, and into the ventilation or recirculation channel sensors are quantitative and qualitative control of the recirculation air and the control equipment the source of draught fan recirculation installation.

The invention is illustrated by drawings, where figure 1 shows the design of the fan recirculation setting for any ventilation network, and figure 2 - design fan recirculation setting, to work in ventilati is the R networks with equivalent aperture equal to or more than 2 m2which is additionally used for ejection effect and thereby more effectively using the energy source of thrust.

The drawings indicated:

1 - source of thrust; 2 - shell; 2A - mixing chamber; 2B - input nozzles; 2B - output nozzles; 3 is a transverse wedge-shaped jumper; 4 - self-sealing valve; 5 - intake channel; 6 - fresh Vozduh; 7 - recirculation channel; 8 - recirculation air; 9 - a mixture of fresh and recirculated air; 10 - vent; 11 - the mixture of exhaust and recirculation air; 12 - exhaust air; 13 - retaining retainer; 14 - sensors and apparatus for automated monitoring and control; 15 - support for equipment; 16 - nozzle.

Fan recirculation apparatus consists of a source of thrust 1, which can be either one fan (1, 2)or as multiple fans installed cascade and configured in parallel and / or sequential operation of the shell 2, is installed in a transverse wedge-shaped crosspiece 3, overlying the cross-section of the recirculation channel 7. The gaps between the shell 2 and the transverse wedge-shaped jumper 3 sealed with sealing material such as a sealant or foam. The jumper is made wedge-shaped, as when the ejector will is replaced with the confuser, he additionally held apart, and, thus, improves sealing.

On one side of the shell 3 is the source of thrust 1, and on the other hand has a self-sealing valve 4, which may be either in the form of shell 2, or in the form of a cone (dotted line in the drawing), and its length exceeds the diameter or height of the cross section of the shell or diffuser. Self-sealing valve is made of airtight and relatively light material, for example of the material of the ventilation sleeves or parachute cloth, or thick nylon, etc. In the event of a power fan such fabric falls down and blocks the cross section of the shell or diffuser.

The pairing of the recirculation channel 7 and the ventilation duct 10 is located a retaining retainer 13, which is mounted on the entire height of the channel and is made of airtight material, such as wooden crate, embroidered ventilating hose or conveyor belt, or metal, or concrete, etc.

The parameters of the location of the jumpers a, b, c, indicated on the drawings, are "know-how" of the present invention and are determined from the ratio that takes into account the performance of the source of thrust, sizes, framing, composition and flow rate and mine depression.

All equipment fan recirculation in the system can be mounted stationary on the supports 15, for example on concrete tables, coasters, frames, and can be installed with the possibility of rapid movement (if necessary) in another part of the ventilation network, for example in the Islands self-propelled equipment (for example, on the frames of trucks).

If necessary prompt transfer recirculation fan installed on a new (another) part of the ventilation network jumpers 3 and 8 in the old section shall be redeemed, and a new site built. Also is the remounting of the control equipment 14 due to the movement of the shell 2 and source pull 1 on the carcasses of the self-propelled equipment 15 in the new section of the ventilation network, thus achieving efficiency and less downtime.

Sensors and equipment of the automatic control 14 are arranged either in the duct or in the recirculation channel in a convenient place.

Fan recirculation system works as follows:

When working recirculation fan installation in ventilation mode with partial reuse of air (figure 1) channel thrust 1 takes part recirculating air 8, clip retaining strap 13 of the ventilation duct 10, which moves the mixture of exhaust and recirculation air 11, and pumps egov shell 2 through the nozzle 16. Further, through the self-sealing valve 4, which opens under the action of the velocity head of the recirculation air 8, the mixture of air flows through the recirculation channel 7 to the air supply channel 5 and then the air supply channel 5, which is a mixture of recirculated air 8 with fresh air 6 with the formation of a mixture of fresh and recirculated air 9, which is sent to the places of its consumption.

Sensors and equipment of the automatic control 14 control qualitative and quantitative composition of the recirculating air 8, namely the presence and concentration of any flammable, toxic, inert and other gases. In case of exceeding the measured values in the recirculating air over 8 valid values control equipment the source of thrust 1 fan recirculation setting disables the power supply and the source of thrust 1 stops. The pressure of the recirculation air 8 is weakened and the self-sealing valve 4 under its own weight overlaps the hole of the shell 2, thereby stopping the recirculation air 8. Afflux of fresh air 6 of the air supply channel 5 creates an additional seal self-sealing channel 4.

When working recirculation fan installation in ventilation networks with given equivale Tim hole, equal to or more than 2 m2you can also use the ejection effect.

The output from the source pull 1 set the nozzle 16 and the shell 2 may consist of several parts: either the mixing chamber 2A is input nozzles 2B, or the mixing chamber 2A - output nozzles 2B, or the mixing chamber 2A and the input nozzles 2B, and the output of the nozzles 2B (figure 2). The cross-sectional shape of the mixing chamber 2A may be performed either cylindrical or rectangular, or square, or elliptical. A similar cross-sectional shape can be the input 2 and output 2V nasdaw. It should be noted that the cross-sectional shape of the input 26 and the output 2V nasdaw determines the shape of the mixing chamber 2A.

The diameter of the outlet nozzle 16 must be less than the diameter of the mixing chamber 2A and the diameter of the inlet nozzle 2B. Through the annular section between the nozzle 16 and the shell 2 is sucking extra volume of recirculated air 8 from the ventilation duct 10.

Retaining crosspiece 13 separates the mixture of exhaust and recirculation air in the duct 10 into two streams: the exhaust air 12, which then moves along the ventilation channel 10, and the recirculating air 8, which is a source of thrust 1 and retaining jumper 13 is sent to recirculatio the s channel 7. Due to the kinetic energy of the mixture of exhaust and recirculation air 11 and retaining jumper 13 decreases protivopar that is generated by other sources of draught ventilation network and the current source pull 1 fan recirculation installation.

The use of the proposed solution allows to increase the safety, reliability and efficiency of ventilation of underground structures by increasing the supply part of the exhaust air to fresh air and next to the place of its consumption; the use of self-sealing valve precluding leakage of air when you stop source of traction, including in case of accidents; to create a velocity backwater due to the energy of the mixture of exhaust and recirculation air and thereby reduce protivopar other sources of thrust, which accounts for the source of draught fan recirculation setting; reduce air leaks by using a transverse wedge-shaped jumper; use ejection effect in ventilation networks with the equivalent aperture equal to or more than 2 m; the possibility of maintenance, including when the recirculation fan installation; reduce the consumption of materials and ease of installation of the fan recirculation setting and in underground confined conditions; automated control of qualitative and quantitative indicators of the recirculation air and control the operation of the source of draught fan recirculation installation.

1. Fan recirculation apparatus consists of a source of traction, shell, jumpers, with sealing gaps between them, with one side of the shell is the source of power, but on the other hand set valve all equipment is located in the recirculation channel in the direction from the ventilation duct to the intake channel and mounted on the supports, wherein the shell is made of one or several parts, and jumper, which has a shell made wedge-shaped and overlaps the cross-section of the recirculation channel, and valve made of self-compacting, with recirculation fan installation is further provided with a retaining strap, which is installed in the pair recirculation and ventilation ducts throughout its height.

2. Fan recirculation apparatus according to claim 1, characterized in that it is mounted either at the stake, or on the Islands of self-propelled equipment or tables.

3. Fan recirculation apparatus according to claim 1, characterized in that the source of thrust has one or more fans installed to skade and configured in series and / or parallel operation.

4. Fan recirculation apparatus according to claim 1, characterized in that the shell consisting of several parts, includes: a mixing chamber and inlet nozzles, or the mixing chamber and outlet nozzles, or the mixing chamber with inlet and outlet nozzle, and the output of the nozzles is made in the form of a cone.

5. Fan recirculation installation according to claim 4, characterized in that the length of the self-sealing valve exceeds the diameter or height of the cross section of the shell or diffuser.

6. Fan recirculation installation according to claim 4, characterized in that the diameter of the outlet nozzle is equal to or less than the diameter of the mixing chamber and the diameter of the inlet nozzle.

7. Fan recirculation apparatus according to claim 1, characterized in that the ventilation or recirculation channel sensors are quantitative and qualitative control of the recirculation air and the control equipment the source of draught fan recirculation installation.



 

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1 cl, 1 tbl, 2 cl

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