DD160186A1 - METHOD AND DEVICE FOR THE ADDITIONAL INTRODUCTION OF FUEL WARM INTO A MELT - Google Patents

Abstract

The invention is applied where, in addition to the usual fuel heating, fuel heat is introduced into a melt for the purpose of continuing a melting process and / or accelerating a melting and / or leaching process. The invention in particular extends the oven travel times, accelerates the melt and reduces energy consumption. According to the invention, at least one duese (5) is arranged at the bottom of hearth melting furnaces (6), through which the final fuel-air mixture is introduced into the melt (3), which ignites in the melt (3) and transfers pure heat of combustion to the melt.

Description

2297

Method and device for additional introduction of fuel costs

The invention "refers to a method and apparatus in which fuel heat is introduced into a melt for the purpose of continuing a melting process and / or accelerating a melting and / or refining process in addition to the usual fuel heating

Known Herdschmel ζ ovens are heated fuel so that a flame can float closely above the surface of a partially mixture constituents covered melt and the Wärine partly through. Radiation, partly by convection to the mixture floating on the melt and to the melt itself transfers' © However, this heating also becomes a considerable part. the introduced fuel heat is delivered to the furnace wall which surrounds the flame, which leads to "strong" thermal bars of the furnace and reduces travel times. "This conventional fuel heating of the hearth furnaces suffers from the high heat losses which predominantly occur at the furnace masonry and occur in the kiln exhaust gas «In order to reduce the output of the kiln melting furnaces, which depends partly on the speed of heat input zx>. Increase, processes and devices "are known, in addition to the usual Brennst off heating heat by electrical additional heating in the melt to bring *

This widely used method of additionally introducing fuel heat into a melt requires a relatively high operational effort,

Object of the invention

The object of the invention is also introducing _five fuel heat into the melt of Melting furnaces to accelerate the melt _s to improve the purification, to extend the furnace campaign times and to reduce the energy consumption of these furnaces ^"1

The invention is therefore based on the task _? to bring in the usual fuel heating of hearth furnaces heat in avoiding the known disadvantages in a melt "" Irfindungsgemäß the object is achieved ₉ that at least by an arranged in the bottom of a hearth furnace nozzle an ignitable.Fuel / air or fuel / oxygen mixture in the melt ₀ ^: It is advantageous to arrange such nozzles over the entire bottom of the hearth furnace and to vary their throughput of ignitable mixture according to the individual process stages. The melt melt temperature at the bottom of molten hearth furnaces is substantially higher than the ignition temperature of fuel / air - Or Brennsfcoff / oxygen mixtures, so that the content of the resulting at the nozzle orifice gas bubble ignites immediately '"During the ignition process, the volume of the gas bubble and thus their boundary layer to the melt considerably, so that a relatively large heat transfer surface .en tsteht © On their way to the surface of the smelting of gibt'die gas bubble constantly heat to which they ÄB surrounding melt ₈ so 'that in the' gas bubble trapped combusted gases reach nearly the melting temperature of the enamel surface and leave with substantially lower temperature the melting furnace ,, as is the case with conventional combustion heating.

Via a known exhaust system, the exhaust gases of the fuel additive heating system leave the furnace _e ^:

embodiment

The invention will be explained in more detail below with reference to a drawing.

It shows the application of the invention to a cross-heated hearth melting furnace with regenerative combustion, the rising in the form of gas bubbles 4 from the bottom of the hearth furnace 6 gas mixture ignites immediately upon entry into the melt 3 and receives in comparison to her a very high temperature. Due to the natural buoyancy, the gas bubbles 4 move under constant heat release and volume reduction in the direction of the melt surface. At the surface of the melt 3 the gas ( _v .) Bubbles burst and the combustion products of the introduced gas mixture almost escape with the temperature of the melt 3 the furnace room 1 «There they mix with the exhaust gases of the usual fuel heating and get into the exhaust system of the Eerdschmelzofens *

Bar bottom of the hearth furnace 6 is provided in its entire surface with nozzles 3 , which separately via the fuel supply 7 & η <3 · over the air or «oxygen supply 8 Brenn *« material and air or «oxygen supplied in such a ratio, that in the nozzles 3 © is formed into an ignitable gas mixture «,

Claims (2)

«R? I »Method for additionally introducing fuel heat into a melt in connection with a combustion process _? in which an ignitable fuel off / air or 'Brennst off / oxygen mixture in a melt ₉ the ignition temperature has beenj introduced j characterized in that the mixture within the melt (3) ignites and on the way to the surface of its heat of combustion of the melt ( 3), « 2 * Apparatus for carrying out the method for additional introduction of Brennst off heat in a melt © according to claim 1, characterized in that ^ at least one nozzle on? Supply of the gas mixture provided at the bottom of the hearth melting furnace See 1 Saif's drawings