FI96760C - Process for preventing the release of particles into the surrounding air space during transport from materials transported on belt, screw, vibration, tow and other conveyors - Google Patents

Description

96760

The present invention relates to a method for preventing the conveyance of material particles from belt, screw, vibratory, towing conveyors and other material conveyors during transport of material from conveyors of belt, screw, vibrating, wide-conveyor and other material conveyors. particulate emissions from the material during transport to the surrounding air-10 space. In many places, belt conveyors are used to transfer material. The materials to be transferred are often: coal, various aggregates, grain, fertilizers, salt, ash, gypsum powder, various industrial chemicals, etc. Conveyor belts and comparable transport methods are open at the top of the conveyor. Due to the open structure, the environmental damage caused by belt conveyors has not been prevented by official regulations, but during transport up to 20 air pollutants have been released into the nearby environment, mainly in particulate form, causing health hazards. The most common disadvantage is environmental pollution, which has affected plants and the landscape. The Conveyor Conveyors, which are constantly in the same position, have been designed to be closed by tubular or other structural shapes to prevent the release of dust and other components into the environment. The disadvantage in many cases is the organization of maintenance. A completely enclosed structure must be dimensioned to withstand the passage of a maintenance man and the entire belt conveyor system as an investment can be too financially heavy to implement. In practice, especially during long transport journeys, damage occurs in which the material to be transported, e.g. coal, begins to fall off the conveyor belt due to some damage, starting to fill the protective structure. This results in environmental damage to the transport system, as the blocked part is repaired to 2,96760 by often dropping the accumulated material down. In the case of fixed conveyors, it is possible to use the above-mentioned conveyor housing with its associated difficulties.

5 In the case of commonly used mobile and continuously moving belt conveyors, closed constructions are not suitable. As everyone has been able to say, the use of belt conveyors in ports, factories, aggregate handling, etc. is often e.g. dusting 10 cannot be prevented. Wetting of the material to be transferred is the most common means of preventing dust. Wetting is not suitable for almost all transferable materials. There are no other means of prevention for belt conveyors on the market to combat environmental damage. The object of the invention is to eliminate the above drawbacks.

The method according to the invention is characterized in that ion-generating tips are used above the material to be conveyed in the conveyors, so that a strong ionic field is produced due to ion-blowing, in which ionic currents flow from the ion-producing tips to the material to be transferred. Conveyor structures are grounded. The material in the transfer can be earthed, for example, by means of earthing wires. The strong ion field above 25 and the grounded transfer material cause dust, dripping, or other components detached from the transfer material to receive an electrical charge in the ion field when attempting to detach from the transfer material and return to the material being transported. Depending on the quality of the material to be transferred, the humidity, the voltage level of the ion production tip and the distance to the material to be transferred, the legal point for the removal of particles from the material before returning to the starting material is about 2 to 30 mm.

An embodiment of the invention is characterized in that 3 96760 ion generating tips are mounted on a high voltage cable. In the simplest use, the high-voltage cable is installed above the transfer conveyor by installing ion-producing tips on the lower surface of the cable. The distance between the tips 5 is determined by the applied voltage and the distance of the tips from the transfer material. In practice, the aim is to keep the voltage at which protection is as low as possible. For example, if the ion tip voltage is about 50 kV and the distance from the tips to the material to be protected is about 50 cm, a distance between the ion tips of about 50 to 70 cm would be appropriate.

A more protected model of the invention against climatic conditions is a load-bearing support structure along the entire length of the conveyor in question, from which both the salt roof structure and the ion production tips are gaining support through the insulating intermediate parts. The above embodiments are available with both fixed and continuously moving conveyors. The structures of the invention are simple and light. The high voltage can be provided with an operating voltage of 12 V, in which case, for example, the battery of a 12 V car 20 is a source of backup power. The energy requirement is very small. For example, a conveyor 0.5 m wide and 20 m long needs about 10 - 20 W for protection.

The invention will now be described, by way of example, with reference to the accompanying drawings, in which Figure 1 shows protection in simple cross-section, Figure 2 shows protection in simple form in longitudinal section, Figure 3 shows structure in climatic conditions, Figure 4 shows structure in climatic conditions, Figure 4 shows structure in climatic conditions Fig. 5 shows the effect of an ion shielding field on the material to be transported, and Fig. 6 shows a belt conveyor equipped with a release of material particles according to the invention.

The apparatus used in the method consists of an ion field 2, 5 shielding the transferable material 1, which is provided by ion generating tips 3. The ion generating tips 3 are mounted above the transferable material surface 1 generally in a queue form so that ion jets from the transfer tips cover the entire material. The required high voltage 10 for the ion generating tips 3 is obtained from a high voltage source, from which, according to one of the simplest uses, it is conducted by means of a high voltage cable 4 along the area above the area 1 to be protected.

Conveyor belts 5 or other transport platforms and tu-15 structures are earthed. The protective structure 6 of the ion production tips can be constructed of an insulating material as shown in Fig. 3. Lightweight high voltage cable can be supported with pipe, wire 7 or other structures.

Figure 5 shows the release event of the material particles and the return to the surface of the material with arrows.

Claims (6)

1. A method for preventing the release of particles into the ambient air curtain from material (1) transported on belt, screw vibration, tow and other conveyors, during the transport, characterized in that ion production tips (3) are used above (2). the material transported in the conveyors, so that, thanks to ion blowing, a strong ionic field is obtained, whereby the ion currents move from the ion producing tips to the material being transported. Method according to claim 1, characterized in that the ion-producing tips (3) are arranged above (2) the material in the conveyors so that they form a row and follow the conveyor path direction and so that they cover the entire ion-receiving surface of the transport material. Method according to Claim 1 or 2, characterized in that the ion-producing tips are protected (6) against external conditions e.g. by means of a ridge-shaped protective roof (6) located over the high-voltage line and the ion-producing tips. Method according to any of the preceding patent claims, characterized in that the ion production tips (3) are arranged at a distance of 10 - 150 cm from the upper surface of the transported material. Method according to any of the preceding patent claims, characterized in that a voltage of 6 - 150 kV is measured at the ion production tips (3).