DE1806943A1 - Method and system for treating coal for use in coke ovens and the like. - Google Patents

Description

Method and system for treating coal for use in coking ovens and the like.

If this registration is the 1st priority of the corresponding .critical registration Eo. 49383/67 of October 31, 1967.

The invention relates to a method and a system spurn treating coal for use in coking ovens or the like

So far it has been suggested to divide the coal into one of To bring in mixing bunkers, from which they are crushing devices, such as crushers, hammer mills or the like., fed which will reduce the fineness (grain size) of the coal to about $ 80 to $ 90 to less than 5 mm (-1/8 "). The Crushed coal is then fed to the high-lying storage or storage bunkers located above the furnace battery, which can hold a coal supply for the furnace for around 48 hours, in order to avoid any failure of the conveyor system ensure the continuity of the furnace feed.

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The coal is then extracted from these storage containers by means of Gravity is fed into loading trolleys moving on rails at the top of the furnace battery, which carry the Bring coal into the ovens as needed.

Such a method has in its application to the conveying, storing and bringing in of dry or preheated There are disadvantages in that the crushing devices generate a large amount of fine cone dust than is desired, so that they cause dust nuisance at transfer points and risk of explosion during storage to lead. In addition, the fine coal dust, when it is introduced into the furnace, leads to the fact that a considerable amount of it in the Üasha main manifold the ovens.

The object underlying the invention is accordingly to be seen in the elimination or weakening of the aforementioned deficiencies and disadvantages.

In accordance with the invention, a method for treating coal proposed for use in coking ovens or the like, which is characterized in that coal with a fineness (grain size) of not more than 2.54 cm (1 ") is dried and heated by means of heat and then sorted in order to separate out relatively fine coal dust from it before the coal is introduced into a storage bunker. - 3 -

"MINN.

According to the invention, a system for carrying out the aforementioned method for treating coal for use in coking ovens o Storage bunker from the funding receiving preheating devices with devices for heat drying and heating the coal, assigned to the preheating devices, the large pieces of coal on a J? ^l _e nit (grain size) of not more than 2.54 cm (1 ") comminuting devices and by the coal from the preheating means receiving cyclone separator, the so-sort the Konle that is deposited before introducing the coal into the storage bin of the relatively fine coal dust will.

The fine coal dust is preferably mixed with oil before it is introduced into the storage bunker.

The preheating devices are preferably also available Firing equipment (of the flash type).

An implementation or embodiment of the invention is described in more detail hereinafter with reference to the accompanying, a Flow diagram aes coal preparation process of the invention illustrative drawing - 4 -

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The plant for carrying out "the coal preparation process according to the invention consists of a number of individual parts, all of known and / or conventional construction are, so that consequently the individual components of the system are not claimed on their own.

The coal processing plant consists of a tilting box 10 for supplying a. Conveyor 11 with uncrushed coal containing, for example, 5 to 10 $ water.Ungrinded coal can be fed to this conveyor 11 from a dump (not shown) or conveyed from the conveyor 11 to the dump with the aid of the conveyor 12 or 13 .

The conveyor 11 leads the water-containing, uncomminuted coal to a crusher 14, from which the crushed coal with a fineness (grain size) of 2.54 cm and / or less, preferably of 15 mm and below, via a conveyor 15 into a series of mixers - And storage bunkers 16 arrives, which can store a coal supply for the coke oven battery for about 48 hours.

The crusher 14 can, if it is not required, i.e. if the coal already has the required fineness has to be omitted, in which case the conveyors 11 and 15 are one and the same conveyor.

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The coal is raised from the mixing and storage bunkers 16 two parallel endless .conveyor belts 17 »18 applied, the coal of the first stage 19 of a multi-stage preheating system operating by means of thermal radiation respectively.

The preheating system can be a two- or three-stage system, depending on the required Degree of preheating consists of two or three drying and heating tubes connected in series.

In the embodiment shown, the preheating system is two-stage.

A coal crusher 20 is by means of a chute 21 to a Jiinsehlämmvorrichtung 22 connected to the preheating system and takes out from it at the top of the drying tube 19 of the first stage slurried coal with a fineness of about 3 inm (+1/8 ") and leads over a chute 23 return the crushed coal to the bottom of the same tube. The preheated or heated coal is at their exit from the drying and heating tube 19 of the first stage a primary cyclin separator 24 of the first stage fed »This Zyilonabscheider 24 is like this constructed that he would remove the coal with a grain size of more than lOOBS mesh from the remaining coal with a

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Grain size of less than LOOBS mesh, separates. Me Fine-grained hard coal arrives from the top of the cyclic separator 24 via a pipe 25 to over a Storage bunker 27 arranged secondary cyclone separators

26 for separating fire gases. The coarser-grained cabbage passes through a chute 29 from the underside of the cyclone separator 24 to the heating pipe 28 of the second stage. This coal is then at a temperature of, for example, 150 to 300 ⁰ C above the storage bunker

27 arranged Hauptvorwärmzyklinabscheider 30 supplied Then the coal from the preheating cyclone separator 30 and the fine coal dust from the secondary cyclone separator 26 eineuracht in the storage bunker 27, the fine Coal dust from the cyclone separator 26 runs over a mixing conveyor 31 in which it enters before it enters the storage bunker 27 is mixed with Ul.

The storage bunker 27 is provided with level indicators that show the flow of coal from the mixing and storage bunkers 16 to the! Conveyor system 17, 18 regulate, and is with inert Gas cleaned. The preheated coal is by means of a gradient from the storage bunker 27 into the hopper of a Charging trolley 33 introduced, which brings the coal into (not shown) coking ovens. The coal is transferred from the storage bunker 27 to the Loading trolley 33 through telescopic ones provided with filters Spouts headed the subject of British

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Patent application 12 402/68 of March 14, 1968, where, As indicated at 34, an oil film is sprayed over the surface of the coal in each JPÜllt is to prevent the loading carriage 33 Dust enters the ambient atmosphere on its way to the ovens · The loading trolley 33 is a "Clean air" loading trolley, which in a known manner with a gas scrubbing and gas ignition device is provided.

The double or twin conveyors 171 18 are provided a possible failure of one of the conveyors between the main coal storage bunkers 16 and the preheating system to balance or to bridge

Although reference is made to the preheating by means of thermal radiation in the above embodiment, other types of heaters can also be used, such as fluidized bed dryers or sonatige Dryers in which the coal is heat-dried.

It will be understood that the procedure described above and lead the plant to its implementation to a facility by means of which the coal in the way can be treated that an impermissible leakage of fine material due to the avoidance of a repeated! Comminution of naturally occurring fine

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Material and based on the treatment of this material is reduced to a very low value in the course of the process. This fact sets the dust nuisance at transfer points to a minimum, significantly reduces the risk of explosion and keeps the Transfer of fine material to the main manifold the coke oven battery to a minimum.

Another advantage of the invention is that you can do without a large storage tank containing a significant amount of preheated coal.

If the preheating log has more than two thermal and drying levels htt, a suitable circulation of the Coal causes.

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Claims (6)

Claims 1. A method for treating coal for use in coking ovens o. The like., Characterized in that Coal with a grain size of not more than 2.54 cm dried by means of heat and heated and then classified: is to remove before the introduction of the coal into a storage bunker from her relatively Mnen coal dust to be deposited. 2. The method according to claim 1, characterized in that the fine coal dust before its introduction is added to the storage bunker 01. 3. The method according to claim 1 or 2, characterized ι that the coal is crushed in such a way that the grain size of the coarser-grained coal prior to classifying the coal is no more than 2.54 cm. 4. Method according to one of Claims 1 to 3, characterized in that the coal has a grain size of not more than 2.54 cm heat-dried and heated, and then into components of two grain sizes is sorted, and that the coarser-grained coal component secondary heat drying and - 10 A 909834/0243 t * ■■ '· ■ ■ - ίο - Heating is subjected, whereupon both carbon components with addition of oil to the finer-grained one Kohlbeatandteil fed to the storage bunker will. 5. Plant for performing the method according to "claim 1 to 4, characterized by the coal a storage bunker (27) feeding conveying means by before the storage bunker arranged, the coal before it is introduced into the storage bunker from the funds receiving preheating means (19,28) with means for heat drying and heating the coal by the preheating means assigned, which crushes the large-sized coal to a grain size of no more than 2.54 cm Means (14) and cyclonic separating means (24,26,30) which receive the coal from the preheating means, which sort the coal in such a way that the relatively fine coal dust is deposited. 6. Anl & ge according to claim 7, characterized by between the storage bunker and the first level of the multi-level Twin conveyors arranged for preheating means, which are equipped with an oil slurry and a comminuting device form a coal circulation system. - 11 - 909834/0243 - li - 7. Plant according to claim 8, characterized by a primary cyclone separator (24), in which the coal fed in after its second passage through the first preheating stage (19) is separated into components with two grain sizes, with means being arranged for the coarse-grained component a second preheating stage (28) of the "Worwärmmittel and then a preheating Zykxonabscheider (30) over the storage bunker (27), and means are provided that the fine-grained coal components from the primary cyclone separator (24) üekunaär cyclone separator (26) over the pre-storage bunker, and means are provided that the coal component part from the secondary cyclone separator (26) when feeding the coal distant parts from the preheating cyclone separator and the secondary Z.) Kxon separators (kb) in the storage bunker 01 (? z) add. 909834/024 ^ • AD ORWtNAL Blank page