DE2335861A1 - Silo storage of cement clinker - spraying with high pressure water on entry to obtain required consistency - Google Patents

Abstract

Dry cement clinker is supported to a cylindrical silo by two endless belt conveyors. The cement is discharged at the top of the silo through a feed hopper and falls past an annular ring containing a number of radially directed spray nozzles. The nozzles are supplied by high pressure water from a pumped supply. By regulating the supply pressure the consistency of the cement mix may be adjusted. The high pressure water, nominally 30 atmos., is generated by a motor driven pump.

Description

07/10/1973 Pat / Ad / Ls BÜHLER-MIAG (EM 1582)

t Order for the introduction of slightly dusty bulk goods into a storage tank

The invention relates to an arrangement for introducing easily dusty bulk material in a storage, especially in a round silo, in which the goods conveyed by a feed conveyor are fed centrally into the silo by a goods supply means.

In order to deal with bulk material that is very prone to dust, for example cement clinker, To keep the development of dust within limits during storage in the silo, a so-called one is used Filling chute as a material supply means. This hopper is at Round silos arranged in the center and as. tubular, hollow Column formed with a large number of outlet slots directed on all sides, through which the material to be ensiled escapes into the storage space of the silo.

Such filling chutes are satisfactory in several ways in practical operation Respect not. In spite of the provision of a filling chute in the silo, the dust is still generated during the stacking process very considerable. In the case of abrasive material such as cement clinker, the hopper is subject to a very considerable, bad controllable wear and must be renewed again and again at certain time intervals. As a supporting element for the silo roof construction acting filling chute requires due to this additional function and its high weight a very stable and expensive foundation. In the case of heavy storage goods, the bottom of the silo sinks unevenly, which, in particular, when the filling chute experiences a tendency as a result, heavy loads occur in the silo roof construction and damage in the Area of the silo roof dome.

The invention is based on the object of reducing the development of dust during the storage process by binding the dust that forms

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07/10/1973 Pat / Ad / Ls BUHLER-MIAG - 2 - (EM 1582)

and avoid a hopper. This task is achieved according to the invention in that the central material supply means is carried by the silo roof structure, free of protruding from the top down into the silo, tubular or funnel-shaped Is stump, which is assigned a spray device which wets the material falling through it with a dust binding agent. The dust binding agent used here is water with an additive in the form of a substance that relaxes the surface of the water Mixing ratio is chosen according to the good to be stored. As an additive for a dust binding agent in cement clinker the agent called "chem Jet" sold by the English company Dust Suppression Limited was shown. Others can, of course Medium with a water surface-relaxing character, for example Pril or the like, can be used. About the wetting effect In the case of storage goods that are difficult to wet, for example hot cement clinker, to be improved and therefore also extremely in the case of such to suppress the tendency to dust as much as possible, is designed according to another feature of the invention, the spray device for applying the dust binding agent under high pressure on the material. So there is still enough space in the dome of the silo for that If a dismantling device, such as the upper portal foot of a semi-portal scraper, is available, it is recommended that the Arrange the spray device at the lower end of the stump. According to the further invention, the spray device itself comprises one The nozzle ring surrounding the material flow with several spray nozzles to which the dust binding agent is supplied by a pressure generator is, in the sense of a good wetting the spray nozzles useful are attached to the nozzle ring in the opposite direction to the flow of material.

The drawing shows an embodiment of the arrangement according to the invention in use in a round silo system for cement clinker, whereby

Fig. 1 partially shows a round silo with the inventive Arrangement in center section and

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10.0? Ο1373? At / M / Ls BÜHLER-f-IIiLG - 3 - - (EM 1582)

Fig. 2 shows a cross section through the Gutauführmittel along line H-II in Fig. 1 on a larger scale shown.

The round silo, consisting of one on the bottom of the silo. 1 standing Supports 2 attached outer wall. 3 and a roof structure 4 with roof 5 resting on the supports 2, has a center ring in the middle 6, on which a cylindrical connecting piece 7 with a support ring 8 for the upper track 9 of a dismantling device, not shown, for removing those remaining in the silo Ring heap is attached. With the same longitudinal axis, a downpipe is in the connection 7 as a material supply means for the cement clinker 10 arranged interchangeably. The downpipe 10 expanded in the shape of a funnel at the top is pushed into a flange ring 11, which is welded to the nozzle 7. For the supply of goods into the silo, conveyor belts 12, 13 »are on for removing goods from the silo Removal funnel 14 with trouser chute 15, both of which have outlet openings 16 can be shut off by slide 17, τοr Seen. For covering of the center ring 6 and Stutrens 7 and the conveyor belts 12, 13 is a roof attachment 18, which on with the center ring 6 connected struts 19 rests.

A spray device 20 is arranged at the lower end of the downpipe 10. This consists of a nozzle ring 21 with a large number of spray nozzles 22 pointing radially and obliquely upwards, which hangs on two retaining tabs 23 which are screwed to the downpipe 10. The nozzle ring 21 is connected according to FIG. 2 via a pipe 24 to a pump 25 as a pressure generator, which supplies it with the dust binding agent in the form of, for example, water with a corresponding addition of "chem 3et" with, for example, 30 atmospheric pressure. The pump 25 is driven by an electric motor 26 and sucks in the dust binding agent from a storage container 27.

The one conveyed by the conveyor belts 12, 13 and into the downpipe The cement clinker that is fed in falls through the downpipe 10 into the storage space of the silo and accumulates here in a heap 28

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07/10/1973 Pat / Ad / Ls BUHLER-MIAG - 4 - (EM 1582)

on. During the passage of the cement clinker through the downpipe the stream of material, as soon as it passes the spray device 20, is intensively wetted by the latter with dust binding agent, the spray nozzles 22 of the nozzle ring 21 apply the dust binding agent to the cement clinker under high pressure and in a very fine distribution, so that the dust is optimally bound.

The amount of dust binding agent to be applied to the storage material depends from the type of goods and the per unit of time through the downpipe 10 flowing material. By monitoring the flow of material reaching the downpipe 10 and controlling accordingly as a function of this flow of material can be supplied per unit of time

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Amount of dust binding agent / ggg ^ e will ^ so that when it becomes stronger Material flow is sprayed correspondingly more dust binding agent and vice versa when the flow of material becomes weaker. This can for example done in that the flow of material on the conveyor belt 18 controlling transducer, such as one in this conveyor belt Inserted belt scale, the pump 25 regulates according to the amount of storage material suggested per unit of time. Instead of an exact regulation However, at least one element that interrupts the supply of dust binding agent should be provided, for example a flow of material in the downpipe 10 monitoring button, such as a light barrier, which interrupts the supply of the dust binding agent, for example by Switching off the electric motor 26 if the storage material supply is interrupted for any reason.

The advance achieved by the invention is one essential less dust in comparison with the known arrangement with filling chute, resulting in considerable cost savings by eliminating a filling chute and its stable foundation as well as avoiding additional stresses in the silo roof construction in the event of uneven lowering of the silo floor and also in a uniform cone of material (no ravine formation) and thus an optimal utilization of the storage capacity of the silo.

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Claims (3)

07/10/1973 Pat / Ad / Ls BÜHLER-MIAG - 5 - (EM 1582) patent claims 1. ^ arrangement for introducing slightly dusty bulk material in ~ ^ a store, in particular in a dog silo, in which the goods brought in by a feeder are fed centrally into the silo by a material supply means, characterized in that the central material supply means is one of the silo roof structure (4) carried, tubular or funnel-shaped stump (10) protruding freely from top to bottom into the silo, to which a spray device (20) is assigned, through which the material falling through can be wetted with a dust binding agent. 2. Arrangement according to claim 1, characterized in that the spray device (20) for applying the dust binding agent is arranged under the stump (10), in particular at the lower end of the stump (10). 3. Arrangement according to claim 2, characterized in that the spray device (20) has a nozzle ring surrounding the material flow (21) comprises a plurality of spray nozzles (22) which are primarily directed in opposite directions to the flow of material and which contain the dust binding agent a pressure generator (25) is fed. 409885/0732 lee rs e i t e