FI115717B - Arrangements for composition of process input - Google Patents

Description

The present invention relates to a system for preparing a process feed from different material fractions. The invention is applicable to the composition of feed material fractions which are solid granular material or similar bulk material. By granular material is meant herein a solid material which is finely divided, even powdery, and has mainly gravity flow properties. However, some or all of the fractions may also consist of finely divided materials which require auxiliary functions such as fluidization in order to obtain a gravity flow.

One application of the system of the invention is to provide a feed for the melting furnace of the glass making process. It is known that the furnace feed mainly consists of quartz sand and various chemicals such as calcium carbonate, sodium carbonate, alumina, sodium sulfate, colorants, etc., depending on the intended use of the glass. The various material fractions must be in the feed in precisely defined proportions. The feeds are composed of batch feeds of carefully weighed fractions, and a mixed feed batch * at a time to be fed to the melting furnace. It is known to monitor the completion of a batch assembly with a weighing apparatus connected to the mixing apparatus.

An example of glass making used herein is a continuous process designed to operate continuously for up to ten years, and during this time does not allow for any major interference with the material feed.

This requires a very high level of operational reliability of the feeder equipment, and therefore the equipment has been backed up by parallel devices, if necessary to be put into operation, at various stages of feed assembly. One essential device in this respect is a mixing apparatus for final feed uniformity incorporated into the conventional feed apparatus by at least two parallel operable units.

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Despite accurate weighing of the fractions leading to the respective mixing apparatus used, the control weighing performed on the mixing apparatus has revealed situations where the weight of the batch to be mixed does not match the default value determined from the retail weighing. Part 5 of the material fractions may have remained as aggregates in the hardware parts between weighing and mixing, or these material parts have gradually accumulated material accumulations. Such a batch must be led to a wreck to avoid problems in the downstream process. The problems have proven to be hardware components which, due to the optional use of said mixer, have been forced to be placed in the equipment. Such hardware components include, for example, intermediate funnels, flow dividers, and each other, as well as drainage channels and piping connecting the weighing devices.

Said problems have been significantly reduced by the system according to the invention, the essential features of which are apparent from the appended claim 15. The features of the specific embodiments of the invention are defined in the appended dependent claims.

The invention will be explained in more detail by means of the accompanying drawing, in which: Fig. 1 is a general view of the system of the invention for assembling a batch of a furnace for the furnace.

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Figure 2 illustrates one of the inputs useful in the ice system of the invention. working scale equipment, and g 25 ,, ·. Figure 3 illustrates an alternative feed weighing apparatus for use in a system according to the invention.

i t * t '"In the apparatus shown in Figure 1, a batch of raw material is fed to a glass furnace

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"* 30 of the material fractions, most of which are stored in equipment silos, generally designated by reference numeral 1. From these silos, the material fractions are taken at 115717 3 fractions at a time by means of a suitable feeder 2, 4 and 5. In the embodiment shown, the weighing devices 4 and 5 function in such a way that they direct the feeder 2 of each incoming material feeder 5 to collect the intended amount of said fraction into the weighing device. and preferably has a function which will be explained later, of course, it may also have the same function as the weighing devices 4 and 5, but the special function will achieve certain, benefits.

In the embodiment shown, the weighing devices 3, 4 and 5 are implemented as scales according to Figures 2 and 3 with a collecting container 6, 7, 8 which can be emptied by a belt conveyor located in connection with the collecting container. In the embodiment shown, the weighing devices 4 and 5 consist of separate collection tanks connected to a common horizontal unit. The weighing devices 4 and 5 can, of course, also be implemented as complete devices, each with its own horizontal unit.

• · · • · ·,. ]: 'In order to carry out the basic idea of the invention, the belt conveyor is optionally disassembled in either direction. This unloading function makes it possible to 'direct the fractions of material collected in the weighing apparatus for the feed batch directly into the currently used blend 9, 10, respectively. In between,' * * 'does not require dividers or spacers to form aggregate-generating elements. cents to the path of the weighed material flow, and hence the vagueness of the mixer * ,. i 25 quantities of feed materials.

i t * ';' In carrying out the invention, it is expedient to use a single weighing device, for example a weighing device 5 for dry material fractions, and

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: * · 4 for damp materials, which further reduces the '· · ·' 30 caking and deposition of materials in the equipment.

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In some implementations, it is also desirable to use different weighing equipment for material fractions that are reacting with one another.

If one of the material fractions forms the majority of the feed batch to be composed, such as quartz sand in the glass furnace feed treated as an example, it is desirable to provide this material fraction with its own weighing equipment, such as weighing equipment 3 in Figure 1. This weighing apparatus is preferably implemented on a loss-of-weight basis. In this case, the fraction of material required for each weighing batch is dispensed into the tank 6 of the weighing apparatus, and the exact metering of the fraction 10 is performed as a function of said reduction when the said weighing apparatus is emptied. The emptying is then preferably carried out in a time-controlled manner so that the emptying time is matched to the emptying time of the other weighing apparatuses (apparatuses 4 and 5). This function significantly facilitates the operation of the mixer, 9 or 10, in use.

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The foregoing description of the rigid system shows an example of apparatus having belt conveyors of the type 3, 4 and 5. Instead of belt conveyors f. : Of course, other two-way transport functions can also be used .. ;; 1 equipment such as screw conveyor, vibrating conveyor, etc.

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Claims (6)

115717 A system for composing a process feed from different granular or equivalent bulk material fractions, wherein the material fractions are blended to the process feed in question in the same blender selected from at least two parallel mixers, and at least two fractions are separated from the specific as a discharge function for the weighing system. A system according to claim 1, characterized in that the dry material fractions are weighed separately from the moist fractions. 3. A system according to claim 1 or 2, characterized in that the mutually reactive material fractions are weighed as separate fractions. 15 A system according to any one of the preceding claims, characterized in that at least one material fraction is weighed as a loss-of-weight function. * · • - · A system according to claim 4, characterized in that the loss-of-weight I I »i ', · 20 function is the weighing of the feed fraction. A system according to claim 5, characterized in that the loss-of-weight * * * * of-weight of the power fraction is adjusted to optimize the mixing result. I | I • * »» «•» • * * $ • * »I • I, 115717