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 . 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.
FIELD: mining, particularly methods and devices to prevent dust generation in tailing pit benches by moistening thereof with water or liquid binding agent.
SUBSTANCE: device comprises self-moving vehicle, for instance pontoon water craft, provided with pump, vessel for reagent, hydraulic monitor, unit with executive tool for channel forming in bank area and isolated power generating plant. Above mechanisms are installed on water craft deck. Hydraulic monitor may rotate in horizontal and vertical planes. Drives of all mechanisms are linked with the power generating plant. Executive tool is installed below water craft floating line. Vessel for reagent is provided with proportioning device. Dust control method involves initially installing the water craft on tailing pit water surface; directing the water craft towards bank to area to be sprayed, in which working tool forms channel for water craft movement; pumping water from tailing pit into hydraulic monitor; adding reagent from vessel to water with the use of proportioning device and spraying the obtained liquid over dust-forming area. Water from tailing pit is used for above spraying operation and for water craft movement.
EFFECT: increased dust control efficiency.
2 cl, 2 dwg
FIELD: mining industry, particularly means or methods for preventing, binding, depositing, or removing dust and preventing explosions or fires.
SUBSTANCE: method involves treating dust-and-gas cloud with finely-dispersed ionized liquid, for instance with water, with the use of sprinkling plants alternately arranged so that ions of liquid spays generated by plants have opposite charges. The sprinkling plants are located outside zone of possible plant damage or are protected against explosion action. Sequence of plant alternation, ionicity, liquid quantity and liquid spraying pattern are determined from tests and calculations based on particular pit or underground mine blasting conditions.
EFFECT: reduced time of particle coagulation on liquid droplets and time of particle precipitation, possibility to reduce dust cloud propagation.
2 cl, 2 dwg
FIELD: mining industry, particularly to catch dust generated by machines and/or rigs in mines and tunnels.
SUBSTANCE: dust catcher comprises body with precipitation member formed as demister comprising moistening nozzles and drip catching means. Fan with drive is arranged near inlet/outlet side thereof. Moistening nozzles located in front of the demister in air flow direction are made as spaced multijet nozzles having separate sprayers, which form common sprayed curtain. The fan is installed in cleaned gas flow downstream the demister and drip catching means. The fan is arranged in case connected to dust catcher body. Demister is installed in contaminated air flow at inlet side and is arranged in inclined position. Upper edge thereof projects relatively lower edge. Air deflectors are arranged between the demister and drip catching means. Bottom sheet is inclined towards drip catching means. Multijet nozzles project towards contaminated air flow and are connected to load-bearing frame obliquely installed in accordance with demister inclination angle. Dust catcher is provided with separate vessels for additives, which pass through metering device into water-pipe. Mixer connected to water-pipe or built in water-pipe is installed downstream the metering device. Spraying device is arranged in front of moistening nozzles and demister with drip catching means. Spraying device comprises spraying heads, which create water mist and is connected with water source or with water-pipe and metering device with mixer. Dust-contaminated air flow is mixed with water mist and then the obtained sludge is gathered. Moist air is dried by water droplet separation and then the dried air is introduced in cleaned gas flow. Gases generated as a result of explosion are laden with water mist preliminarily mixed with additives, which create ecologically safe compositions with nitrose or similar gases formed during explosion.
EFFECT: increased operational efficiency and reduced dust catcher size.
20 cl, 8 dwg
FIELD: mining, particularly to depress dust generated during rock milling in enterprises of mining and smelting, coal, construction industries.
SUBSTANCE: plant comprises control unit, high-pressure source, siphon-type vessels filled with ionized water having opposite polarities, spraying jets, which generate fine spray, electromagnetically driven pneumatic and hydraulic valves, pressurizing and purging air channels, water pipelines, coupling members for air and water pipelines and control circuits.
EFFECT: increased dust depression efficiency.
SUBSTANCE: invention is related to the field of mining, in particular, to safety issues in coal mines, namely to explosions of methane caused by friction spark created as a result of mine machines picks friction against hard rocks. Method is suggested to assess danger of rocks regarding friction inflammation of air-methane mixture, which consists in the fact that rock samples are taken, their strength and content of silicon dioxide are determined, and then tests are carried out at test bench danger of friction sparking. In order to perform test, explosive mixture is formed in test bench, and nominal cutting speed is increased 1.5 times. If at hardness of rocks f from 3 and content of silicon dioxide up to 30% no inflammations were observed and no friction sparks were produced, then rock is considered safe. If at hardness of rock from 3 to 5 and silicon dioxide content from 30 to 50% with availability of friction sparks with temperature of up to 300°C and absence of inflammations, rock is considered as spark-hazardous of the 1st extent, and if their temperature is more than 300°C - to spark-hazardous of the 2nd extent. If at least one inflammation occurred from friction sparks, rock is considered highly explosive. Use of suggested method makes it possible to increase safety of cleaning and preparatory works.
EFFECT: development of fundamentals for rock classification procedure by danger of friction inflammation in case of their damage with account of their physical-mechanical properties.
SUBSTANCE: device of pressure water supply to irrigation systems arranged on sections of shield mechanised support for underground mines, includes at least one system of plough or combine working element route irrigation in longwall, and at least one system for irrigation of worked space, upper ceiling and/or side mine with central water line for supply of spray nozzles of irrigation systems and switching valves. At the same time all switching valves for irrigation systems are installed in a single irrigation valve box, which is equipped with connection for water line and is arranged on section of shield mechanised support in the form of unit separated from hydraulic valve box.
EFFECT: improved operational safety of device for water supply into irrigation system.
8 cl, 4 dwg
SUBSTANCE: method includes long-term treatment of a dust and gas cloud with water vapour during the blast and afterwards. Vapour is produced by a mobile steam generator by introduction of water in it that has been heated previously up to 65-70°C. The steam generator is installed in the place that is safe from the blast and is directed along with the wind. Besides, prior to blasting, atmosphere above the blasting area undergoes treatment.
EFFECT: higher efficiency of dust suppression, manoeuvrability of plants.
SUBSTANCE: previously laboratory analysis is carried out on coal from a bed and its packs to detect availability of elements and substances in them that may create compounds with water; natural cracking is detected, as well as cleat in the coal bed; wells are drilled from a bottomhole by coal, with length more than by 1 m of the mine skirting cycle; water is injected into the bed with continuous measurements of the methane, water pressure, injection time; the mine is tunnelled for the value of the hydrated bed with the speed that does not exceed methane release within permissible norms; in the area of bed hydration blast holes are drilled in the sides of the mine at each cycle to detect the hydration area. During arrangement of the mine, parameters are varied, which are related to injection of water into bed, maximum reduction of the released methane, optimising arrangement of the mine.
EFFECT: higher efficiency of development of gas-bearing coal beds.
SUBSTANCE: method involves supply of frozen fluid obtained by mixing with liquid gas to the worked-out space. In addition, distribution of coal dust supplied to the worked-out space is determined as to particle fractions. Distribution of the obtained frozen fluid particles as to fractions is equal to distribution of coal dust as to particle fractions.
EFFECT: improving the prevention efficiency of coal self-ignition in mines.
SUBSTANCE: method includes spraying a liquid in a flow of air arriving to a mined space. At the same time liquid spraying is alternated with supply of dry gas into coal deposits. Moisture content in gas discharged from the coal deposit is measured. Gas supply is replaced with liquid spraying in case moisture content stops dropping in gas discharged from coal deposit.
EFFECT: improved safety of mining works.