SU1016659A1 - Method of heating-up and purifying from oil of metallic charge - Google Patents

Abstract

THE METHOD OF HEATING AND OHHCTKJH FROM THE OIL OF THE METAL CHARGE In order to increase the degree of heating and heat utilization, the coolant is discharged from the layer of both oil mixture after it is heated to 25 ° C-2500 ° C in an amount of 25-4% of the total heat transfer medium. (L and Od El; O

Description

The invention relates to black megalurgy, in particular to methods of preheating heating and cleaning the metal charge from moisture and oils; pepper; in the electric furnaces; A method is known for preheating the charge, melting pepper, according to the charge mixture on the vibrating conveyor by dropping the combustion products upwards through the layer of the charge and the holes in the conveyor, while the coolant is pre-prepared in a special device, blown under the conveyor pent and then evenly blown through the layer on the belt and thrown into ambient atmosphere. The conveyor is fenced off from the environment to prevent interaction of the schiz (with the outside air C). The well-known method is characterized by insufficient use of the heat carrier energy from the discharge of the charge, since it gets to this place sufficiently heated and the waste gas leaves the layer with a high temperature. The heating of the oily batch. The hot gases are enriched with harmful vapors from the evaporation and sublimation of the oils, which causes pollution of the atmosphere. The heat of the oils contained in the batch is not used. The technical result and the achievable result is a method of heating and cleaning metal oil from oil, including heating the heat with coolant by supplying it countercurrently, burning gases, discharging a portion of the heat carrier to the atmosphere and feeding the rest to evaporating the oil from the smoke. chip heating is higher, since if the temperature of the coolant rises above 350 ° C, it is possible to cause an explosion of oil vapors in the heating tank. As a result, hardware is consumed, and metal waste can reach 10 °. The purpose of the invention is to increase the degree of heating and heat utilization. i The goal is achieved by agreeing to the method of heating and cleaning metal oil from the oil, bftivt. heating the mixture with coolant, supplying it with countercurrent, afterburning of gases, discharging part of the coolant into the atmosphere and transferring the rest to evaporation of oil from the mixture, discharging the heat transfer medium from a layer of deoiled mixture after heating it to 25O10 592 -40% of the total amount of coolant. The method is carried out as follows. The initial batch is loaded into the hopper 1, located at the end of the belt or vibration conveyor 2, enclosed by the casing 3 from the surrounding space. By the conveyor 2, the charge moves from loading to unloading into container 4, from which it is fed to the smelting furnace. At the discharge end of the conveyor 2, through the nozzle 5, coolant with a temperature of 900 ° C is fed in opposite to the movement of the sculling material, which moves over the scraper layer, heating it. At the same time, the length of the conveyor belt is heated from the initial temperature equal to the ambient temperature to 750-8OO C on the discharge side. The temperature of the coolant, on the contrary, decreases from 90 ° C in the place of its supply through the nozzle 5 to 10 ° -150 ° C in the place of loading the bargain onto the conveyor from the hopper 1. As the heating bar is heated, oils and moisture evaporate from it. The evaporation of moisture and oil ends at a temperature of 250 psi. At this temperature of the charge with the oncoming movement of the coolant, the temperature of the latter is ZOO-35SR. Thus, the coolant is in contact with the oily material with a temperature not exceeding 350 ° C, which guarantees the impossibility of ignition of the oil vapor. Subsequently, the coolant is moved towards the charge, where it is enriched with oil vapors, and is supplied by the fan 6 to the afterburner 7, where the temperature is / 900 ° C. . in the oxidative cutter, it is burned to produce harmless products of complete combustion. To dissipate the vapor, the oxidizer 7 feeds the oxidizer through the pipe 8 and the fuel through the pipe 9. The afterburning temperature is about 900, since when it is lowered, complete afterburning is not achieved, and during the heating, the cost of heat to the afterburning increases. Studies have shown that to burn 10OO m of polluted gases it is necessary to spend about -40 m of natural gas and the corresponding amount of oxidizing agent. This, depending on the oiliness of the chips, in each cycle of circulation, this heat carrier increases its volume by 25-40%. The accumulation of the quantity of heat carrier forces it to be discharged from the system. The gases are discharged from a paste 310 by hotsu of the heating process through an opening 1 O, presumably heated in the casing 3 of the conveyor. The discharge pressure is located at the point where the gas temperature is ZOO 350 ° C, and the charge temperature is 250 ° C. at gome.maximalnom level, they are not yet polluted with oil vapors. At the beginning of heating, the conveyor is filled with a clean, oil-free mixture, which will result in the extraction of oil vapors when the coolant is supplied with temperature. After that, the charge is maintained ao as long as the temperature in front of the discharge pipe does not reach 25O-ZOO C. From this moment, a continuous heating mode is started, at which an oily charge is fed to the load, and its temperature is opposite the waste pipe C, which is achieved by controlling the loading rate of the charge and the heat of its movement along the conveyor. In this case, 25-4% of the coolant is thrown out through the waste pipe. Example 1, ShH15 steel chips are heated on a vibrating conveyor according to the proposed method. Heating capacity 1OO kg / h. Chilled oil 3%. On heating serves 45 m- / h. O. coolant with a temperature of 9OO C. that provides for heating chips to. At the end of the heating cycle after evaporation of the oil from the chips, the amount of coolant increases by 2.8 m and is 47.8 m / h. These cans are fed into the combustion chamber and reach 59.4 at the flow rate of natural gas and voipuh in the furnace at 1.9 and 19 .. Thus, 68 gases come out of the burnout chamber, which again enters the conveyor with chips from its heating. Along the conveyor belt, their hemperatura decreases from the exit to the voyoe through the ija. Alina convey. the air in place, the charge temperature of the mixture, through a pipe with the help of an ejector of 20 m / h, the gases are discharged into the atmosphere. The remaining 48 m / h are directed further along the conveyor, heating new batches of chips and evaporation oil. As a result, the coefficient of use of gepla is 0.9. :. Example 2. Chips steel SH 15 is heated on a vibrating conveyor by a known method. Heating capacity 100 kg / h. Oil concentration is 3%. 75 m h of heat of the carrier with a temperature of 350 ° C is fed to the heating, which makes it possible to heat the shavings of ao 275 C. After evaporation of the oil, the amount of heat carrier increased by 2.8 and is 77.8 m / n. In the afterburning chamber, 3.2 m / h gas is additionally burnt in a gas of 32 m v4 air horo, reaching a temperature of 9OO ° C. The gases are then diluted to a temperature, for which they are added 17 ° C of air at a temperature of 20 ° C. From the resulting .. .. with 28O m of heat-transfer agent 75 m are fed to the conveyor to heat the chips, and 205 are dumped into the atmosphere. The heat utilization factor here is 0.27. The results obtained are tabulated.

Known 2O5

350

0.27

275

1OO

Claims (2)

METHOD OF HEATING AND CLEANING FROM THE METAL CHARGE OIL, including heating of the mixture by heat carrier by supplying it by countercurrent, burning of gases, discharge of part of the heat carrier c. atmosphere and the rest of the supply to the evaporation of oil from the mixture, about t and - in that, in order to increase the degree of heating and use 1. US patent No. 36677 47, (56) cl. 266/24, 1973. 2. USSR author's certificate of heat, heat carrier discharge is carried out from a layer of an oil-free mixture after it is heated to 250-300 ° C in a quantity of 25-40% of the total Heat and 0) Si 1 1016659