SU1756579A1 - Device for dust-gas suppression in open pits - Google Patents

Abstract

Use: for ventilation of mines and tunnels in the mining industry and the production of building materials. SUMMARY OF THE INVENTION: A turbofan with a pivot and tilt system, a tank for irrigating fluid, a pump and a spray nozzle, made in the form of a chamber consisting of an inner cylindrical 11 outer conical casing. At the same time, the taper angle is equal to 22.5 ° A, spraying apparatus with radial profiled blades, a shaped annular chamber with an annular gap. In this case, the spraying apparatus is placed in the front part of the inner cylindrical casing, and the profiled annular chamber is placed behind the spraying apparatus and connected to the nozzle chamber with hollow radial profiled blades. 7 il.

Description

"

fc

The invention relates to safety equipment and can be used in the ventilation of mines and tunnels in the mining industry and the production of building materials.

A device for generating precipitates is known, comprising a turbofan, a spray nozzle, on the outer side of which a conical spray annular chamber is arranged concentrically, forming an ejection channel with the upper surface of the nozzle. Inside the spray nozzle, tubes are installed with a gap relative to one another, and the outlet part of the annular chamber is made expanding at an angle of 30-60 °.

The disadvantage of the device is the low efficiency of dust and gas suppression,

due to the outflow of the irrigating liquid from the slit of the spray nozzle into the low-speed jet formed by the propeller, due to which the dispersion of the liquid deteriorates, the range of the air-water jets decreases, and the distribution of the irrigating liquid is uneven, since the main part falls out in the immediate vicinity of the installation.

A device for fixing the dusting surfaces is known, comprising a turbo fan with a pivoting and tilting system, a tank for irrigating liquid, a pump, and a spray nozzle in the form of a chamber consisting of an inner cylindrical and outer conical shroud.

but

about c VI about

A disadvantage of the known device is the low efficiency of dust and gas pressure, due to the fact that all the irrigating liquid from the annular gap escapes at the boundary of the low-speed flow created by the propeller of the turbo-fan and the high-speed flow of the jet gas jet, as a result of which uniform saturation of the gas-air flow liquid, the dispersion of the liquid worsens and the range of the jet decreases, as a result of which the main part of the irrigating liquid also falls into eposredstvennoy vicinity of the installation.

The aim of the invention is to increase the efficiency of the device due to the uniform distribution of the spray liquid in the gas-air jet and to increase its long range.

Applying the invention to irrigate the polluted atmosphere of open-cast mines provides improved working conditions for workers and reduces environmental pollution.

1 shows a General view of the device with a longitudinal axial slit; figure 2 is a view along arrow A of the device from the exit side of the gas-air jet; on fig.Z

- ring sweep of the blades of the last stage of the engine turbine; figure 4 is a velocity triangle at the exit from the impeller of the last stage of the turbine, where Wa

- relative flow velocity, U - circumferential velocity RK, Ca absolute flow velocity, C2a - axial component of the velocity C2, Sai - projection of the velocity Cg on U; Fig. 5 shows an annular scan (grid) of a spraying nozzle spraying apparatus, where Ci is the gas flow velocity at the spraying apparatus outlet; 6 shows the intensity of droplet release using known (curve I) and proposed (curve I) devices; in FIG. 7, the core of the maximum gas flow velocity, where OK is the half taper angle of the outer casing, the radius of the nozzle, Oc is the angle of the cone of the jet of gas jets.

A device for dust control in quarries contains a turbofan 1 with a system of its rotation and tilt, a tank for irrigating liquid and a pump (not shown in Fig.), As well as a nozzle 2, made 8 in the form of chamber 3, consisting of an external conical 4 and an internal cylindrical 5 shells, forming in the narrow part of the annular gap b.

Inside the spray nozzle 2 there is a coaxially mounted annular shaped chamber 7 with an annular slot 8. Connected to the chamber 3 nozzles by radial hollow blades 9 with perforations 10. The chamber 3 of the spray nozzle is connected to the pump and the tank for the sawing liquid (Fig. Not shown a) pipe 11. In the lower part of the outer casing 4 on the horizontal axis 12, complaints 13 are installed with the possibility of rotation in a vertical plane by means of, for example, electric actuator 14. In the front part of the spray nozzle there is a spraying an apparatus consisting of profiled blades 15 and a connecting ring 16.

The angle of taper of the outer casing 4 is 22.5 °, which makes it possible to create4 at a distance of the 5th nucleus the constant velocity of the jet of gases; forming the outer casing and the jet core are the same or parallel. The propellers of the turbo-ventilator of the torus 1 create an air flow, and the gas turbine 17 creates a high-speed jet of reactive gases (RG). which, after passing the gas blower 18, enters the blades 15 of the spinning apparatus, where the flow twist is eliminated, and then, at the outlet of the spray nozzle 2, forms the edges of the constant velocity core (curve I). Availability

The spraying apparatus does not allow eliminating the component of the absolute velocity of Sai, which causes the flow of reactive gases, and increasing the axial velocity of the gases at the outlet of the spraying apparatus (Ci Caa).

The device works as follows.

The irrigating liquid flows through the nozzle 11 into the outer chamber 3 of the spray nozzle, from where it is distributed in the flow of the WG,

Due to the coincidence of the forming shell 4 with the jet core boundaries, the annular slit 6 of chamber 3 falls into the jet core zone.

When the irrigating fluid enters through the pipe 11, it is distributed in three directions: annular slit 6 of the outer chamber 3, perforations of 10 radial vanes 9, annular slit 0 of the inner chamber 7. Due to this distribution

The irrigating fluid (in three streams in the core zone of a constant maximum velocity of the gas-air jet) fully utilizes the kinetic saturation energy of the jet. As a result of the elimination of the RG flow twist, tangential forces disappear, throwing droplets of the spraying liquid tangentially to the outer boundaries of the jet and leading to intensive

dropping out (solid precipitation) at close distance from the device.

Eliminate twist WG flow, increase axial velocity and uniform saturation; Taken together, they ensure the improvement of the distance between the jets and the uniform distribution of liquid droplets on the irrigated surface. In the range of qz qi, the proposed device is an efficient prototype: the main mass of the sprayed liquid is transferred in a gas-air jet over long distances. In the range (qa qi), the main part of the liquid when using the prototype falls out of the Jet in the immediate vicinity of the device due to the twist of the gas flow and is lost, and the remaining part of the liquid is not enough to treat the air, working areas of the quarry that are removed at a distance of 200 m Then, as the proposed device provides in this interval, less / loss in the immediate vicinity of the installation, and consequently, more liquid is sprayed and participates in the air cleaning process. . Thanks to a uniform distribution in the jet and a decrease in the twist of the gas flow, the maximum of the precipitation intensity is displaced in the direction of the jet spread, as compared with the prototype, by 2.5 times (B.Shhax). In the proposed

the device changes the irrigation intensity (displacement x2 max) can be varied in a wide range due to the mode of operation of the turbofan engine (speed of the gas turbine and the airspace), fluid flow, the angle of inclination of the jets in the vertical plane, the speed of angular displacement in the horizontal plane;

Claims (1)

DETAILED DESCRIPTION OF THE INVENTION A device for dust and gas in quarries, comprising a turbofan with its rotation and inclination system, a container for irrigating fluid, a pump and a spray nozzle, made in the form of a chamber consisting of an inner cylindrical and outer conical housings, characterized by the aim of increasing the efficiency of the device due to the uniform distribution of the irrigating fluid in the gas-air jet and the increase in its range, it is equipped with a spraying apparatus with radial profiled blades and a profiled annular chamber with an annular slot, the spraying apparatus is placed in front of the inner cylindrical casing, and the profiled annular chamber is placed behind the spraying apparatus and connected to the nozzle chamber with hollow radial profiled blades, casing is equal to 22.5 °. J Ultrasound ® / S K / 3  VF / 1756579 Type A at Phage 2 Fig.Z, W SD Fiz.Z with, W 0 W // ON FIG f f Imax