DE4424950C2 - Device for withdrawing gaseous products and for draining the glass melt and their use - Google Patents

Description

The invention relates to a device for withdrawing gas products as well as for draining the glass melt from one Device for melting a batch of glazable materia lien according to the preamble of claim 1.  

To problematic residues, e.g. B. rust ash and filter dust from waste incineration plants, so that a subsequent treatment safe and inexpensive landfill or even that the glazing has become further use possible proved to be a suitable method. Although doing most of the problematic ingredients from the dusts to be glazed, Ash or slag, sludge, soil, refractory material or asbestos, largely incorporated into a glass matrix can be closed, but gaseous fraction always remains le being pulled out of the glass melting furnace over a fireplace will. When they are drawn off, these gaseous products cool down, whereby condensate and / or sublimate can also arise.

It goes without saying that this condensate and / or Sublimate must not get into the glass melt to be removed, at least not when you get glass of certain quality wants to continue to be used in the construction sector, for example should.

EP 0 445 030 A2 avoids this problem by: the outlet for the glass melt and a condensate drain to each other are arranged diametrically opposite on the melting tank. This leads to an increased space requirement of the entire system, the may not be desirable.

EP 0 359 003 A2, however, proposes that in the exhaust system feed the resulting condensate to the glass melt in a controlled manner. If necessary, the condensate is then drawn off with the bile.

While it still seems possible with new systems, according to the previous Proposal from EP 0 445 030 A2 is to be retrofitted to the plants for waste recycling the idea of the small space may be in the foreground.

DE-A 17 96 039 relates to an oven for carrying out a electric glass melting, in which in particular problematic glass melts to be treated, whose Stability a special temperature profile in the melting furnace required. To this temperature profile, which is a homogeneous glass melt to be removed should be set up the well-known furnace has two houses, being in the first House, referred to as the melting zone in the previous publication, introduced the material to be glazed and initially only is melted. The melted material is then transferred through a canal to a second house called Working area is called. Then then as appropriate Recognized temperature profile must be set in the work zone provided no less than four facilities, namely Resistance elements that are above the melt level the axis of the work zone, below the glass level electrodes placed, electrodes in the flow channel, the also affect the temperature profile in the work zone be, especially in the area of the glass outlet, as well as a Partition wall that separates the melting zone from the working zone and the evidenced on page 4, lines 2 to 5, the DE-A 17 96 039 is partially cooled by water. Consequently the essential measures are taken in the work zone, to optimize the glass melt with regard to the temperature profile lubricate. From the drawing figure 1 shows that the deduction channel for gaseous products above the passage, the connecting the two houses of the melting furnace. In addition, the discharge channel only conducts gaseous products from the melting zone, but not from the work area.

It is therefore the object of the invention to provide a compact, also for Retrofit suitable device for withdrawing gaseous  Products as well as to drain the glass melt the risk of contamination of the flowing glass melt through condensate and / or sublimate that precipitates from the exhaust gas, does not exist.

This task is carried out by an organization with the characteristics of Claim 1 solved. Advantageous refinements are the subject of subclaims.

According to the deduction, the gaseous products drove directly arranged above the outlet, with the deduction and the Aus run at least one common wall for the glass melt have cut that is fluid-tight. Through this Arrangement can condensate and / or sublimate at most on the hot molten glass drip in the melting furnace, where it immediately reappears evaporates and is therefore not included in the melt.

According to a preferred embodiment of the invention, the common wall section at least partially made for infrared if not direct, let through at least indirectly material. This is a heat balance between the flowing glass melt and the exhaust gas entering the chimney created, usually the exhaust gas some of its heat is transferred to the glass melt in the outlet, which means that Flow behavior of the glass melt is significantly improved. So waste heat that escapes anyway can be used advantageously.

The common wall section can also be made at least partially Alumina and / or chromium oxide-containing material. So that will the effect is essentially achieved through heat conduction.

A device according to one of the preceding claims is found their use preferably in an oven for vitrification Residues, especially of silicate-containing residues, such as Dust, ashes, slags, sludges, floors, refractories or asbestos, with pollutant content, in particular  Heavy metal content, the residues continuously introduced into the furnace and melted there will.

The device according to one of the preceding claims can also be used used in an at least partially burner-heated oven will

In the following, the invention is intended to be used only as an example with reference to the attached drawing will be explained in more detail. The shows only drawing figure a longitudinal sectional view of a glass melting furnace with a device for extracting gaseous Products and to drain the glass melt according to the present invention.

The residual material mixture is introduced into the glass melting furnace through an insertion screw 20 and deposited on the bottom of the melting tank 10 as a pouring cone. The exposed surface of the melt cone above the melt level 12 is swept by the flame of a Brennerein device 30 shown only schematically in the drawing, so that material is melted, which then flows into the glass melt. Any metal or metal sulphide components formed collect at the deepest point in the bottom of the melting tank and are discharged through a drain (not shown). In the upper part of the furnace above the melt level 12 , gaseous waste products are formed which enter a chimney 62 through a discharge 60 , through which they are drawn off in a vertical direction. Directly below the fume cupboard 60 is the outlet 70 for the glass melt, which opens into a feeder 80 , where the glass melt is heated by additional burners or additional electrodes 78 . The output of the feeder 80 forms a derivation 76 which can be closed by a locking device 74 . Between the fume cupboard 60 and the outlet 70 there is a common wall section 72 , which can consist of a material that is directly permeable to infrared radiation or of material that is indirectly permeable to infrared radiation, containing alumina and / or chromium oxide, or a combination of these substances. This common wall section ensures temperature compensation between the exhaust gases flowing into the chimney 62 and the flowing glass melt. Since, as a rule, the exhaust gases will be hotter than the glass melt, the latter will absorb heat, so that the additional burners 78 may only have to be operated to a limited extent. The exhaust gases, on the other hand, are cooled further, and condensate and / or sublimate is not disadvantageous because it cannot get into the outlet 70 for the glass melt.

Reference list

10 melting tank
12 melt level
20 conveyor device (insert screw)
30 single burners
60 deduction
62 fireplace
70 outlet
72 common wall section
74 locking device
76 derivative
78 additional burner
80 feeders

Claims (5)

1.Device for withdrawing gaseous products and for discharging the glass melt from a device for melting a batch of glazable materials with a melting tank in which a minimum melting level is maintained and a maximum melting level is not exceeded, with one Chimney-connected fume cupboard for gaseous products, which opens into the melting tank above the maximum melt level, and with an outlet for the glass melt, which opens into the melting tank above the minimum melt level, characterized in that the fume cupboard ( 60 ) for gaseous products directly above the Spout ( 70 ) for the glass melt is arranged, wherein the trigger ( 60 ) and spout ( 70 ) have at least one common wall section ( 72 ) which is fluid-tight. 2. Device according to claim 1, characterized in that the common wall section ( 72 ) consists at least partially of at least indirectly transparent material for infrared radiation. 3. Device according to claim 2, characterized in that the common wall section ( 72 ) consists at least partially of alumina and / or chromium oxide-containing material. 4. Use of a device according to one of the preceding claims in a furnace for vitrification Residues, especially of silicate-containing residues, such as Dust, ashes, slags, sludges, floors, refractories material or asbestos, with pollutant content, in particular Heavy metal content, with the residues continuously in the Oven introduced and melted there. 5. Use of a device according to one of the preceding claims in an at least partially burner heated oven.