A method of obtaining a dispersed water for dust suppression

 

(57) Abstract:

Usage: for dust control during blasting, transportation and processing of various materials in mining industry and construction. The inventive water temperaturas 120 - 180°C and absolute pressure 2-11 kg/cm2release into the atmosphere. In the atmosphere the water instantly becomes overheated condition and boils in the whole volume. The resulting pairs tears stream and turns it into a torch atomized dispergating water spray. 1 C.p. f-crystals, 1 Il.

The invention relates to methods for dispersed water for dust suppression. It can be used for dust control during blasting, transportation and processing of various materials in mining industry, in particular in the extraction of potash ores and construction.

Well-known and widely used methods of dust suppression, based on irrigation of suspended dust particles, water droplets, formed by mechanical fragmentation of jets in a variety of ways. Thus moistened with suspended dust particles coagulated and deposited under the action of gravity.

A method of obtaining a dispersed water by means of the injector mehanicheskaya water (70-80% of the droplets have a size of more than 100 microns). As floating dust particles have much smaller sizes (less than 25 microns) and poorly captured large drops of water, the use of this method results in excessive water for dust suppression at low efficiency.

More effective ways of getting dispersed water obtained by means of devices for Pnevmostroimashina and pneumatic nozzles. However, they require a source of compressed air, which is not always possible to have [1]. Also known is a method of obtaining atomized water mist for dust suppression from a pair of low settings (see ibid., S. 121-125). The essence of this method lies in the fact that steam, cooled, forms a condensation aerosol (fog), consisting of tiny droplets of water, which, owing to their small size, well-moistened dust particles. Due to this, this method provides the most efficient dust suppression with minimal water consumption.

However, the disadvantages of this method is the high consumption of energy for evaporation of water and the need for special treatment (reducing the hardness of the water to reduce scale formation in steam generator.

The purpose of the invention to provide a chalk the effect on the level of the water mist, retrieved from pair, but cheaper, less energy-intensive and easily implemented in mountainous conditions.

This goal is achieved by the fact that the water supplied to paleodelta is under an absolute pressure of 2 to 11 kg/cm2and heated to a temperature of 120-180aboutWith in excess of its boiling point at normal atmospheric pressure. Accepted parameters of heating: the heating temperature is less than the 120aboutWith the dispersion of the jet of water will be insufficient (droplet sizes greater than 100 microns), and when the heating temperature 180aboutSince the droplet size is 25 μm or less, i.e., they have the optimal size of the dust fine dust. Further temperature increase will only lead to waste of energy and danger of ignition and explosion of methane that can be contained in the air of mines, hazardous gas. A jet of water with a temperature of 120-180aboutWith penetrating the atmosphere instantly becomes overheated condition, boils throughout the volume and forms steam breaks the stream, turning it into a torch atomized dispergating water spray. When the steam cools down, it forms droplets of condensation of fog, so this factoryi easy to adjust the degree of heating of water, providing optimum conditions for the wetting of the dust particles.

Know the use of explosion of superheated water (see ed.St. N 612048, CL E 21 F 5/10, 1974) for instant passivation air environment in the mines.

In the proposed method, it is used to create a water torch long-term actions for dust suppression in mines.

Know the effect of the explosion of the overheated liquid for spraying various substances in aerosol containers, where the propellants are liquefied gases (freon, propane, and so on) (see Tsetlin C. M. Aerosols in the home. M.: Nauka, 1978). Unlike aerosol cans hot water in our case is both a propellant and a useful agent.

Thus, the proposed solution meets the criterion of "significant differences".

The essence of the proposed method is implemented by setting, the concept of which is shown in Fig.1.

The installation consists of a hermetically sealed container 1 with the inlet and outlet nozzles, heater 2, the exhaust valve 3, a nozzle 4, pump 5 and tank 6 for water. Between the pump and the capacity of the integrated overflow valve 7 and the back 6, then turns on the heater 2, the valve 3 is closed at this. After filling the tank 1 with water and achievements in her pressure, which is adjusted by the relief valve 7 (3-10 kg/cm2), it opens and the excess water poured back into the tank 6. After heating the water in the tank 1 to a predetermined temperature (120-180aboutC) open the valve 3 and the heated water is flowing from the nozzle 4, instantly turning in the overheated state, and scipy.

Although the fragmentation of a jet of water begins immediately upon its exit from the nozzle, it doesn't happen instantly - decay continues and in the process of being removed from the nozzle and ends at some distance, depending on the power coming out of the jet. Since the pressure in the tank 1 will be reduced after the opening of the valve 3, the valve 7 is closed and the pump 5 will begin to supply water into the tank 1, compensating for her loss and ensuring the constancy of the parameters of the torch and stability. The valve 8 prevents the breakthrough of the heated water and steam from the tank 1 into tank 6 when the pump stops, 5.

This method of dispersion allows water sprayed per unit of time a significant amount of her with getting the torch monodisperse atomized spray for dust suppression with m is laodameia steam) energy consumption for the formation of aerosol drops 3 times, as a minimum, while maintaining the high efficiency of dust suppression.

1. A method of OBTAINING a DISPERSED WATER FOR DUST suppression, including hot water and steam, characterized in that, with the aim of creating a stable atomized monodisperse water torch long steps and save electricity, water under pressure above atmospheric, is heated to a temperature above its boiling point at atmospheric pressure, and then releasing it into the atmosphere and create an explosion of hot water with her aerosol spray, and the constant parameters of the torch support nutrient pump.

2. The method according to p. 1, characterized in that water heating is carried out at an absolute pressure of 2 to 11 kg/cm2up to 120 - 180oC.

 

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