SU1407874A1 - Method and apparatus for preventing sticking and freezing-on of rock mass onto conveyer belt - Google Patents

Abstract

The invention relates to conveyor transport, and in particular to methods and means for preventing the sticking and freezing of the rock mass on the conveyor belt. The goal is to reduce sticking and freezing of the rock mass on the tape. For this purpose, a working agent is used on the conveyor belt before loading it with rock mass, for which a snow-icing mixture is used. The device to prevent the rock mass from sticking to the belt includes a pneumatic system for supplying air (fans, compressor, etc.), a pre-cooling chamber 2 for the forced flow and a snow-icing mixture chamber 3. Chambers 2 and 3 have jet ejectors (ESS) 7, 8, output nozzles 9, 10 of which are connected to the atmosphere. Chamber 2 is made with an air manifold 11 connected by means of heat exchange tubular elements 12 located in channel 13 for air flow 5 (L

Description

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ka Channel 13 is connected to the working nozzle of the SE 7, and suction chamber 15 of the SE 7 is connected to the air collector 11. Camera 3 is made in the form of coaxially located external and internal cavities (П) 17 and 18, separated by perforated partition 19, the cooled forced air flow is directed The snow-icing mixture chamber 3 and the inlet ports 21 on the end wall 20 are divided into two parts into the chamber 3. One part of it enters the internal P 17 of the head 16, into which water is injected by the nozzle 28 to form a snow-iced mixture, and the other - to the P 18. Water droplets freeze. Then, the snow-ice on the mixture is applied with a layer on the conveyor belt. 2 sec. and 2 3 r P. f-ly, 5 il „

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The invention relates to conveyor transport means, and in particular to methods for preventing the rock mass from sticking and freezing on the conveyor belt.

The purpose of the invention is to reduce sticking and freezing of the rock mass on the belt.

Fig. 1 shows a device for carrying out a method for preventing the sticking and freezing of the rock mass on a conveyor belt; in fig. 2 — chambers for air cooling and the formation of a snow-iced mixture, vertical section; in fig. 3 shows section A-A in FIG. Fig 4 is a section BB in Fig.2; in fig. 5 is a section bb In FIG.

The method of preventing sticking and sticking of the backstop mass on the conveyor belt is carried out by applying with the help of a pneumatic system to the tape before loading with the rock mass a working reagent, which is used as snow-icing on the mixture.

A device for carrying out the method of preventing the sticking and sticking of the rock mass to the conveyor belt includes a blowing machine 1 of discharge action (fan, blower, compressor), a pre-cooling chamber 2 of the forced air flow, a snow-icing mixture chamber 3 and an outlet 4, oriented to the conveyor belt 5 before point 6 of loading of the transported rock mass of Camera 2 and 3 onto it

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equipped with jet ejectors 7 and 8, the output nozzles 9 and 10 of which are associated with the atmosphere.

The chamber 2 is made with an air manifold 11 connected by means of heat-exchanging tubular elements 12 located in the duct 13 for the passage of the forced air flow of the chamber 2 with the atmosphere. Channel 13 is connected to the working nozzle 14 of the jet ejector 7, and the suction chamber 15 of this ejector is connected to an air manifold 11, Chamber 3 is filled with an inlet head 16 consisting of two coaxially located internal 17 and external 18 cavities rectangular or cylindrical shape. The wall 19 separating the cavities 17 and 18 is perforated. The end wall 20 of the head 16 is provided with inlet ports 21 for passing the air flow from the chamber 2 into the cavities 17 and 18. The chamber 3 is placed in the housing 22 with a coaxial gap 23 connected to one side with the help of nozzles 24 with the atmosphere, and on the other with the suction chamber 25 of the jet ejector 8, the working nozzle 26 of which by means of the highway 27 is connected with a jet machine 1,

The internal cavity 17 is provided with a nozzle 28 for forcible spraying of water supplied to form a snow-iced mixture. The outlet of the nozzle 28 is oriented along the direction of the forced air flow in the cavity 17.

The device allows to obtain a snow-free mixture with the lowest energy consumption and to raise the temperature of atmospheric air (to bring it closer to O c), at which the method is used quite effectively.

The temperature of the forced air flow rises by tons of gas-fueled machines. Therefore, it is necessary to pre-cool the forced air flow. This increases the efficiency of obtaining a snow-iced mixture, since the intensity of freezing of water increases and the specific

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freeze on her. This is also facilitated by the orientation of the outlet of the nozzle 28 in the course of the air flow in the cavity 17, the placement of the holes in the wall 19 and the windows 21 in the wall 20, and their dimensions should be mutually linked.

The length of the inlet head 16 and the cavity 17 is chosen so that, at the exit of it, the water droplets are already covered with an ice shell. The full freezing of water is carried out with its further movement into the inlet-flow of cold air at the formed air flow through the chamber 3 of the snow-iced mixture. Formation up to the outlet nozzle 4. A cold-iced mixture promotes cooling of the chamber Zg. The removal of heat from chamber 3 increases the intensity and reduces the specific flow of cold air to form a snow-iced mixture.

The forced air flow and the snow-icing mixture chamber 3 can also be cooled by using refrigeration units. However, this complicates the design of the device as a whole and increases the energy costs of obtaining a snow-iced mixture. The use of cold air for these purposes is most effective. Forming air streams of cold atmospheric air to blow the chamber 3 and cool the heat exchanger, which is 35 degrees, it is subjected to tubular elements 12 in the pre-cooling mode with a suction using jet ejectors by the power of cold heat exchange tubes 7 and 8 most appropriately. These are elements 12. Cooling itself allows to avoid an increase in the temperature of elements 12 by means of cold air flow rounds, which is always atmospheric air, which through

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The presence of an external ice shell around unfrozen water droplets does not allow them to freeze on the walls of chamber 3 in the area from the inlet head 16 to nozzle 4. If necessary, the inner surfaces of chamber 3 can be covered with a plastic polymer, the adhesion properties 25 of which are relative to to the water frozen on its surface is quite low.

The method is carried out as follows.

A stream of atmospheric air of negative temperature T with a full-flow machine 1 is injected into the channel 13 of the chamber 2, due to the fact that its temperature rises by 30 degrees.

Yes, it is, if they are formed in the mode of injection.

To increase the intensity of the heat transfer process from chamber 3 and

the elements 12 and the air collector 11 are drawn from the atmosphere by the jet electrode 7. The working flow in this ejector is a part of the forced air flow to the cooled air flow, and all heat exchanging surfaces can be made with finned atmospheric air. If necessary, the pre-cooling chamber 2 of the forced air flow can be placed in a casing with a coaxial gap connected to the air manifold 11. The perforation of the wall 19 allows

From channel 13 of chamber 2, the cooled injected air flow is then directed to the snow-iced mixture chamber 3. Here, the air flow by the inlet ports 21 on the end wall 20 is divided into two parts. One part of the flow enters the internal cavity 17, and the other into the external cavity 8, the head surface from the internal 55 ki 16. The internal cavity 17

inlet cavities 17 16, an air cushion that does not allow droplets of water injected into cavity 17 reach wall 19 and water is injected to form a snow-iced mixture. Droplets of sprayed water, interacting with a cold air flow, begin to

The length of the inlet head 16 and the cavity 17 is chosen so that, at the outlet of it, the water droplets are already covered with an ice shell. Full freezing of water is carried out with its further movement in the injected air flow through chamber 3 up to the outlet 4.

How many degrees, it is pre-cooled with the help of cold heat exchange tubular elements 12. The elements 12 themselves are cooled by cold atmospheric air, which through

The presence of an external ice shell around unfrozen water droplets does not allow them to freeze on the walls of chamber 3 in the area from the inlet head 16 to nozzle 4. If necessary, the inner surfaces of chamber 3 can be covered with a plastic sheet, the adhesion properties of which with respect to water frozen on its surface is quite low.

The method is carried out as follows.

A stream of atmospheric air of negative temperature T with a full-flow machine 1 is injected into the channel 13 of the chamber 2, In connection with the fact that its temperature rises at the same time

elements 12 and the air collector 11 are drawn from the atmosphere by the jet electrode 7. The working flow in this ejector is a part of the nagam from the channel 13 of the chamber 2. The cooled forced air flow is then sent to the ice-cold mixture chamber 3. Here, the air flow by the inlet ports 21 on the end wall 20 is divided into two parts. One part of the stream enters the internal cavity 17, and the other into the external cavity 8 is injected with water to form a snow-iced mixture. The droplets of sprayed water, interacting with the cold air flow, begin to freeze. Part of the air flow from the external cavity 18 through the holes in the wall 19 enters the internal cavity 17, forming on the wall 19 from the side of the cavity 17 an air cushion that prevents the droplets from measuring the water to reach the wall 19 and freeze on it. Next, the snow-ice on the mixture is applied by a pipe 4 to the tape, as a result of which sticking and freezing of the load on the tape is reduced.

Claims (3)

1. Method of preventing sticking and freezing of the rock mass on the conveyor belt, including the application With the help of a pneumatic system on the tape, before loading the working reagent with its rock mass, I also differ from the fact that, in order to reduce sticking and freezing of the rock mass on the belt, snow is used as a working reagent on the mixture. 2. A device to prevent the rock mass from sticking and freezing onto the conveyor belt, including a pneumatic system for supplying air and an outlet for feeding the working reagent to the belt, characterized in that it is equipped with chambers for cooling the supplied air and forming snow-covered Heated atm 8 27v Ur 2 % Kolo (rern five 078746 the mixture, a liquid nozzle for spraying water, the chamber for forming a snow-icing mixture made g in the form of coaxially arranged external and internal cavities with a separating perforated partition and an end wall with a window, the liquid nozzle installed 10 in the internal cavity of the chamber. 3. A device according to claim 2, about 2 tons — and that the chamber of forming a snow-iced mixture is equipped with a jet ejector with a suction unit. 15 with a chamber, working and exit nozzles, covering the suction chamber with a casing with a gap, the gap being associated with the atmosphere and the suction chamber of the jet ejector, the working nozzle 20 of which is connected to the pneumatic system for supplying air, and the outlet nozzle is connected with the atmosphere, 4, The apparatus according to claim 2, characterized in that the cooling chamber for supplying air is made with heat exchanging tubular elements, a jet ejector with a suction chamber, working and outlet nozzles, an air manifold co 30 communicated through the heat exchanging tubular elements. With the atmosphere and the suction chamber of the jet an ejector whose working nozzle is connected to a pneumatic system for feeding 35 air, and the outlet nozzle has access to the atmosphere. Heated atmospheric ffoffy 4/7 8 27v Ur Ur GT t KoloZniy (real OK: jcm & a / rfffoc ffffS / ffjr rxv ft water Vu.l fig.Z 2U .3 17 2Z FIG. in-s yy sp3ffi / x FIG. five