CN85101717A - The forehearth of melten glass - Google Patents

Abstract

A kind of medullary ray cooling forehearth of regulating the melten glass temperature is equipped with end baffle plate on the chute both sides of forehearth.Be stamped a vault medullary ray on the trough and be furnished with vertical channel, nozzle brick and nozzle are set along the both sides of trough upper edge.Flue block is installed on the nozzle brick, and the flue block lower surface exceeds the nozzle certain distance to the trough centerline direction, therefore, can lean on it along the heat of trough avris reflection from nozzle.

Description

The forehearth of melten glass

The present invention is about the improvement of this type forehearth, and this forehearth has the afterbody cooled region, and outside or front portion are so-called temperature control or homogenizing zone, constitutes the outer end portion of conveying chamber, and the general body of this conveying chamber is the groove of forehearth.In the operational process of this type forehearth, the direct cold wind that comes by the top at first at cooled region, reduce glass temperature, the heat that eliminating comes out from glass, and for the whole glass that leave cooled region, regulate the heat that is provided, so that make the medial temperature of glass be equivalent to shift out the temperature that the glass place requires in the exit or from transit chamber or hopper.When the homogenizing zone of carrying this glass by outside or forehearth, manage to eliminate the thermograde between the glass different piece, thereby prevent or the heat of compensation glass loses in a large number.Lean against the homogenizing zone, regulate the heat that offers glass and realize that purpose is to allow all glass temperatures evenly or equably obtain needed temperature.

Because the glass that provides from the effusive glass of melting pool or material source, in the process of conveying chamber, there is the cold-peace that becomes the slower trend that flows at contiguous path cell wall place by forehearth.Usually, provide some type of heating, do one's utmost to make the temperature of fluidic one side or edge section and main flow to adapt, this mode makes the cooling of glass region intermediate by the roof radiation of forehearth cooled region.And in fact, reduced by heat exchange action on the one side of glass main flow and the thermosteresis of edge.Use the cooled region of molten glass being delivered to most of forehearths of gob feeder at present.

By the U.S.'s 2144973 patents that W.T.Jboniss delivers, pointed out the early stage technical examples of existing forehearth and example preferably, in this patent, the concrete cooled region that discloses, point out to be used to cool off forehearth or

The air of arch is admitted to the air flue of building forehearth masonry structure top in, and discharges in the middle of air flue.Equally, carry the position of air on nozzle to forehearth, usually, have identically apart from the position in the forehearth outside with the nozzle mouth, therefore, gas inlet is in the vertical direction of nozzle mouth, the explanation of making by the Jboniss patent, air is along the center of forehearth, the top of horizontal inswept cooling forehearth, and to not influence of molten glass.By the same token, usually, nozzle provides heat along the edge of forehearth, on one side improved the temperature distribution that arrives the other side, guarantees that the glass in the forehearth groove has uniform temperature.Should be noted that and in the Jboniss reference, passing forehearth Brake shoe brick 54 and 55 are equipped with in upwards expanding of arch center on the vertical openings, these openings are quite big, and when comparing with the forehearth cross-sectional width, opening almost is 1/3rd of a forehearth groove insied width.

The present invention is about improving the method for forehearth cooled region, wherein freezing air is sent into from the avris of forehearth and towards the medullary ray of forehearth, here, refrigerant and combustionmaterial by the vapor pipe carrier band, this product is from the nozzle that is arranged on the forehearth sidewall, and its covering sidewall scope is: introduce freezing air by flue block, from the avris expansion of forehearth vault, minimum 3 inches of every limit is 33% of the every hem width degree of forehearth trough of removing inwall to the maximum.By outer tube air is delivered to flue block, therefore, freezing air is limited in unique centerline of forehearth, because the radiation of cell wall, and obtain bigger concentrated heat.

Fig. 1 is the view elevation view with glass temperature cooled region forehearth of the present invention.

Fig. 2 is the cooled region front view of half amplification of Fig. 1 forehearth.

Fig. 3 is the vertical vertical cross section by Fig. 2 forehearth medullary ray.

Fig. 4 illustrates the arrangement of outer cooling tube and outer flue block for the sectional view by forehearth cooled region 4-4 direction along the line.

With reference to Fig. 1, represented the typical cooled region total length of forehearth of the present invention among the figure in detail, this cooled region is made up of two or more a plurality of independent cooling zone, and Fig. 2 is the part side-view of Fig. 1.We should be appreciated that, the part that Fig. 2 right side cuts should in fact only be described and illustrate the previous section or the typical cooling zone of forehearth cooled region of the present invention with shown in Figure 1 that part of identical as for Fig. 2 itself.Fig. 2 left end should be the part of guiding forehearth temperature regulated zone, but does not illustrate, and the right-hand member of forehearth shown in Figure 1 should be the part that connects refiner or melting zone.The frid of forehearth is made of the refractory heat-insulating cushion material, as mullite, though frid 10 represent as one-piece construction, be actually by a large amount of fragments of brick and be built into, and its end brick layer is layered on the metal overlayer structure 11, and these metal overlayer structures are being supported by several I-shaped Beam 12.Should consider that also the bottom of forehearth is supported on the position that is higher than cell floor, but in this figure, not express the support of this overall feed path.

As Fig. 4 finding, groove brick 13 is layered on above the frid 10.The size of groove brick 13 is roughly 2 feet long (as shown in Figure 3) in typical forehearth, and the glass guide channel that is built into groove brick 13 actual wide be 26～48 inches.A large amount of nozzle bricks 15 are being supported in the upper edge 14 of groove brick 13.As shown in Figure 3, every nozzle brick 15 is supporting three independent nozzles 16, is connected with the air feed nozzle pipe 17 at the nozzle brick back side again subsequently.Each spout is made of duct 18, and duct 18 connects an inlet that dwindles 19 shown among Fig. 4 19, and the tip of nozzle 16 just is arranged in 19.The inlet 19 that dwindles on the every limit of cooled region is connected with house steward 20 by jet pipe 17, and house steward 20 is connected with corresponding air-supply duct, provides fuel to nozzle.House steward 20 distributes fuel to valve 21, so just can adjust and control fuel combustion amount in the duct.

Because air and fuel had mixed before being sent here by house steward 20 usually, so outside air is isolated with outer end, fuel duct.In such a way, can finish to several ducts pressure and the uniform fuel mixture of component are provided, pressure and gaseous mixture can be scheduled to and select, and are perfect combustion so that supply with the mixture in each duct in the duct.This will provide heat with inside end wall and adjacent with it glass to heating each duct.In addition, be mapped to the bottom surface 22 of the flue block 23 that stretches out from the flame of nozzle 16 ejection, the glass surface below it provides radiant heat.The flue block 23 that stretches out has roughly covered 1/3rd of glass groove width." 1/3rd " have been considered to ultimate range, because if big again, the center cooling area is just not much of that.See Fig. 3 and Fig. 4, each flue block that stretches out is a pair of wedge shape, and an otch 24 is arranged on sectional.Otch 24 combines with the bottom surface 25 of dome brick 26 and constitutes gas inlet.Referring again to Fig. 4, along the side discharge groove brick 13 that constitutes by insulating material such as mullite material refractory brick structure 27, in addition, brick structures or construct 27 and covered by three-layer tablet shape thermal insulation material 28.In order to force heat to flow away, lay flaky same material along the exterior wall of dome brick 26 from side wall.

Avris along forehearth is equipped with sufficiently long big I-shaped Beam 29, and in fact this I-shaped Beam plays main supporting role to the refractory brick that constitutes microscler forehearth, as shown in Figure 1.This just I-shaped Beam 29 and the horizontal whole forehearth of I-shaped Beam 12 together support make it exceed 10～12 feet at least than cell floor.As shown in figs. 1 and 3, at the forehearth left end individual layer end plate 30 is housed.End plate 30 these parts abut against the temperature regulation section of glass transfer system, and the forehearth of well heater and cooling system is housed in order to sealing

Arch face, thus prevented that air from invading the attemperation section of forehearth.

Shown in Fig. 3 and 4, running through every block of dome brick 26 all has an extend perpendicular opening 31.Opening 31 has along the downward venting hole of the medullary ray of whole forehearth.Each opening 31 all is furnished with a movable closure or flashboard 32.Support and mobile flashboard or closure with lever 33, the pivot of lever 33 is loaded on an end 34 places of fixed support carriage 35.The other end of lever is connected with motion arm 36.In order to operate whole lever 33, motion arm 36 is connected with mechanism, and this device is not shown, all is provided with this mechanism so that each flashboard 32 can both rise or fall on demand along the forehearth total length.Under normal circumstances, will place on these certain height with a threaded bar 37,37 are screwed in the regulating part 38, and 38 are connected with the external part of lever 33.In the normal running, lever 33 and flashboard 32 generally are in the fixed position, and when only carrying out heating just and temperature regulation in the forehearth stopping production or to forehearth, motion arm or lever 36 just adjust.

There is one by a pair of horizontally extending channel-section steel Beam 39 and 40 steel framed structures that constitute at the forehearth vault.The horizontal both sides Beam 39 and 40 that collapses is connected with translot steel 41.These channel-section steels or Beam 41 are supporting airduct 42, see Fig. 1 and 2, and each crossbeam 41 all supports an airduct 42, and the lower end of airduct communicates with house steward 43.Each house steward 43 has the part 44 of two or more a plurality of inside stretching, extensions, and their cross sections are generally rectangle and place in the open end that flue 23 bricks constitute.Therefore can see that the both sides that will shunt the forehearth of flowing through from the next air of airduct downwards enter house steward 43, thereafter, arrive venting hole 31 by the low central position of flue block 23 inswept arch brick lower surfaces.By this sample loading mode, no matter selected temperature or optimum temps are what, and the medullary ray of forehearth all keeps cooling off.Utilize the relative position of adjusting flashboard 32 and opening 31, can adjust the volume and its flow velocity of control of cooling air.As shown in Figure 1, the air that flows into airduct 42 is from air main 45, and in fact air main 45, links up air main 45 and each airduct 42 by many arms 46 through whole forehearth.Each arm 46 all is equipped with a butterfly valve 47, the motion arm of valve is connected on the lever 33 by armed lever 48, and lever 33 connects and support closure or flashboard 32, and when flashboard 32 puts down when cutting out opening 31, butterfly valve 47 also cuts out simultaneously and stops in the air admission forehearth.This also is very conspicuous, and when adjusting lever 33 risings with threaded bar 37 or falling flashboard 32, butterfly valve will open or close accordingly, so just obtain an air feed and flashboard and open the system that both match.According to foregoing structure, the operation of forehearth is that needed adjustment freezing air is entered from the both sides of forehearth, rather than by the fire-resistant position above the structure.Freezing air passes masonry earlier to unfavorable aspect three before entering feeder channel: (1) masonry is wanted turn cold uncontrollablely; (2) cooling air is heated its cooling efficiency is reduced; (3) some outside airs enter feeder channel from the slit of masonry or the perforate that occurs that is in operation, and therefore produce additional non-controlled chilling.In addition, because flue block stretches out a part than the edge and the nozzle of glass guide channel more, so have considerable radiant heat to be reflected by the flue block lower surface along the glass guide channel both sides, enter in the glass guide channel, the both sides of general glass guide channel are lower than centre temperature.Because the edge thermal losses of forehearth is littler than the forehearth of prior art, therefore, viewpoint from temperature control and temperature distribution, the cooled region of forehearth can produce uniform glass well since along the thermosteresis at edge than transition cooling and reheating that old-fashioned forehearth occurred.

For those skilled in the art, more than the advantage of the forehearth of Miao Xieing is significantly, and the result of this technology controls and provide more equably melten glass better.

Claims (5)

1, a kind of forehearth of transferring of molten glass, comprise the elongated slot that a groove brick of being installed by many levels constitutes, many nozzle bricks are housed along the upper edge of groove brick, many flue blocks are placed on the nozzle brick, and this brick exceeds the big distance of nozzle brick to the forehearth centerline direction, many key bricks cover at flue block with above the forehearth, this key brick is provided with vertical channel at certain intervals along the forehearth medullary ray, each duct all is furnished with damper block, make each damper block and key brick keep giving the mechanism of deciding the slit, be installed in the nozzle unit on the nozzle brick, flue block with horizontal hole, the air main that duct on a plurality of and the flue block joins, each air main extend and contain several flue blocks duct, and airduct is connected with each air main.

2, according to the forehearth of claim 1, also be included in whole forehearth both sides heat-insulating shield is set, its width is greater than the degree of depth of forehearth trough.

3,, also be included in the key brick tapered outer surface and be stamped heat-insulating shield according to the forehearth of claim 2.

4, according to the forehearth of claim 1, wherein this airduct comprises a horizontal component and two horizontal components that extend to forehearth both sides, lower edge, downwards the collar extension of extension connects air main, provides the device of air to be connected to the horizontal position of airduct usually.

5, melten glass method of temperature in the control forehearth groove, this method comprises, the guiding cooling air passes the flue block that an end stretches to the forehearth medullary ray, fuel mixture is lighted at many positions under flue block, burned flame is limited on the glass surface at contiguous forehearth abutment wall position, products of combustion and cooling air are discharged from the medullary ray position of forehearth vault.

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