DE1671366B2 - PROCESS FOR MANUFACTURING AGGLOMERATES FOR MOLDED COCK PRODUCTION - Google Patents

Description

6. The method according to any one of claims 1 to 5, characterized in that the after one of these claims produced agglomerates an additional calcination process be subjected.

The invention relates to a method for Manufacture of agglomerates for the production of shaped coke from weakly baking or non-baking ones Coal, which is a mixture of carbonaceous solids and a carbonaceous binder rolled in a rotary kiln and agglomerates and tar are extracted and in which an inadequate 5 corresponding amount of the required carbonaceous binder in the rotary kiln autogenous, generated by itself will.

An embodiment of such a method known from German Patent 8 88 089 ίο is described below.

The prior art also includes the method according to US Pat. No. 3,073,751 which a rotary kiln is used to convert carbonaceous coal coming from a single starting coal To roll solids together with a binder and separate agglomerates from given Size and shape. This process requires the use of bituminous baking Coal as the starting coal, which becomes plastic at the temperature of the rotary kiln, so that there is enough binder is produced and the coal particles adhere tightly to one another. According to the invention, however, the The starting charcoal can be a charcoal that bakes only weakly or not at all.

Regarding the state of the art, it should also be mentioned that it is known from US Pat. No. 30 18 242, bituminous coal with. Extract solvent. But also in this case the coal is baking Coal, and the process of this patent specification is not used to produce agglomerates for the Form coke production, but only for the production of gasoline from the coal.

The method according to German patent specification 8 88 089 deals with the production of molded coke from a charcoal mixture that contains low-baking or non-baking charcoal. The procedure but is not economical or not feasible for certain types of coal for two reasons. That The starting coal mixture to be used should and must namely except for the weakly baked or not baking coal according to claim 1 and page 2, lines 12 to 19, additionally contain baking coal. Furthermore, the binding agent is pitch, produced by the decomposing degassing of the coal and during the calcination will be produced. It should be emphasized, however, that when using non-baking or low-baking coals necessary amount of binder is considerable, if not according to the German patent at the same time baking coal is used in the starting mixture. Would be the bakkende If coal is not present, the amount of pitch produced by decomposing degassing would be are insufficient to produce the agglomerates and the process would not be economically feasible be.

In contrast to the method according to German patent specification 8 88 089, the invention is based from the method mentioned at the beginning, the task is based, from non-baking or weak baking coal without using baking coal such a large amount of carbonaceous Binder autogenous to produce that this is sufficient to produce the agglomerates, and without that pitch is added from a foreign source. It also belongs to the task of the invention, preferably to use a single source of coal and not a mixture of coals.

The invention problem is solved in that

3 4

at least a portion of the raw coal by means of elevated temperature, generally extracted in the area solvent at elevated temperature, between 350 and 400 ° C, in an extract and in _the majority of the solvent v _om extract off a carbon-containing solids residue separated. «Separated and a non-distillable fraction. B. 380 ° C can be formed between and this in the rotary kiln together with the 5 30 and 40 percent by weight of the abandoned coal carbon-containing solids in the form of extract as an extract. The process-related formation temperature necessary for shaped bodies details for the separation of the coal in an exerheated, which is sufficient to the not distillier- tract and in a residue flowable however for the bare fraction and the carbon invention is irrelevant. In general, to make tacky at-containing solids and ₁₀ to this method to bring about the BiI- the coal in a closed-making of the agglomerates. Retort in the presence of a solvent formed during the process. In a practical implementation of this process, the self-formed solvent is heated, as is still the case in detail, the following applies: is carried out. "As much extract is produced. During the extraction, an extract and a residue can be produced externally from a considerable part of the charcoal that can expediently be produced without the addition of hydrogen. Without this addition. The part of the Hydrogen can be extracted until almost the solvent is returned, which is not distilled 50%.

animal fraction is used in the rotary kiln at its high level

Temperature as a binder. Another part of the solvent through a line 14 into a

Binder is produced from the tar introduced at the separation zone 15. In this zone the

Agglomeration and is formed during calcination. Residue z. B. by filtration or centrifugation

This tar is fractionated and produces a distillate separated from the extract. Still in that

Tar fraction as well as pitch, the extract, which is also dissolved as a binding solvent, is

is not used. The distillate tar fraction 16 to a solvent recovery zone

is passed with at least part of the starting coal 25 20. This zone is where most of the

mixed at an elevated temperature to give a solvent recovered by distillation

Extract and a solid residue. The residue and through a line 18 back into the inlet line

A low temperature process is introduced for this extraction. Additive or substitute solvent is

subjected to coking or smoldering and in half, if necessary, through a line 22 into the same

converted into coke and tar. After heating, the inlet conduit is introduced. The separated, in the western

Semi-coke introduced into the rotary kiln and the tar essential non-distillable extract of 15.9 kg

serves as the solvent for the original Extrak weighs, together with 2.4 kg of solvent, the

_uon . as a result of the high temperature and the

If all of the starting coal is completely reactive with the coal to form a non-distilling

non-baking charcoal is made, it is preferably 35 baren liquid has been polymerized by a

the entire starting coal of the extraction treatment line 24 into a supply line 26 for the

treatment with the solvent. If, however, liquid binders are introduced which lead to the agglomeration

the starting coal is weakly baked coal, so rierungsdrehofen 25 leads. 4.85 kg of circulatory pitch, that

it is preferably divided into three subsets, obtained in a manner to be described below,

The first subset of the extraction treatment 4 ° is also fed through the feed line 26 for the

is subjected to the solvent, the second liquid binder is conveyed. Thus, overall

Partial quantity is fed directly to the rotary kiln together with 23.1 kg of binding agent at the same time

and the third subset to produce semi-semi-coke in a manner to be described below

coke and tar of a low-temperature coking or the extract residue is obtained, in the turning

-Subject to smoldering, with at least 45 furnace introduced.

part of the semi-coke introduced into the rotary kiln. The residue obtained in the separation zone 15 is _w j _r d. Introduced through a conduit 28 into a cryogenic zone 30. In the process according to the invention, this zone is operated at temperatures of approximately 496 ° C. in FIGS. 1 and 2, respectively, and the drawings show schematically as process sequences. The semi-coke is passed through a non-baking line 32 into a heating zone 35, in which coal or a weakly baking coal is used. he by combustion with in-F i g through the line 34. 1 schematically shows a method that can be used with guided combustion air at a temperature of non-baking coals. At this 55 about 649 ° C is heated. The hot semi-coke, process is preferably the entire task - namely an amount of 26.1 kg, is pre-extracted through a coal with a solvent, whereby line 36 is introduced into the rotary kiln 25, an extract suitable as a binding agent is obtained. In the rotary kiln, which can be rotated around its longitudinal axis, the hot semi-coke and pitch are brought together in the figure for certain materials in the figure by adding numerical values to illustrate the 60 rolling and rolling movements, a material balance that is based on previous behavior of the substances search through the furnace can be achieved. move. The temperature of the introduced Halb-Through a line 12 45.4 kg of fine-grained coke is selected so that the temperature of the non-baking coal (on a water and ash-circulated mixture adiabatically on an approximately free basis, wa) with a content of 3.77 kg 65 413 ^C C is held. Structure and mode of operation Ash in an extraction zone 10 for the coal and a furnace used for agglomeration are guided in. In the extraction zone, the coal is described by the German patent application C 36 375 of July 13, treatment with a coal solvent in 1965.

Green agglomerates, which have a predetermined size, withdrawn from the furnace and placed in a calcining or Firing zone 40 introduced, in which they are heated to an elevated temperature, namely so high that substantially all of the volatiles are removed. The calcined or fired product is taken through a line 41. The amount of shaped coke removed weighs 29.1 kg wafer. The molded coke contained 3.8 kg of ash. Agglomerates that do not have the desired shape size (faulty grains) become reintroduced into the Ticftcmperaturverkokungszone 30 through a line 39.

The solvent used in extracting the coal in extraction zone 10 is as follows received: In the low-temperature coking zone 30, in the rotary kiln 25 and in the Kalzinierbzw. Tar is produced in the combustion zone. This tar is conveyed through lines 42, 43, 44, 45 to a Tcer reclamation zone 46 introduced, in which all gases are separated and discharged through a line 47. The tar itself is introduced into fractionation column 50 through line 48. In this will the tar in a light, passing distillate with a boiling point below 230 ° C, which in a Amount of 2.0 kg accrues, in a middle distillate with a boiling point between 230 and 400 ° C, which is obtained in an amount of 3.3 kg, and a pitch fraction separated by 4.9 kg. The middle fraction provides the additional or replacement solvent for the Extraction zone, while the pitch fraction is recycled directly back into the furnace and acts as a binder.

In Fig. 2 a method is shown schematically, which is particularly suitable for use with weak for baking coals, as opposed to non-baking coals. The in F i g. 2 reference numbers used denote, insofar as they coincide with the reference numbers in FIG. 1, the same or corresponding ones Features of the embodiment of the invention. Because the coal is weak in this case can be baked, it can use part of the necessary binding agent during the agglomeration stage deliver the rotary kiln yourself. Accordingly, it is not

ίο necessary to feed all coal to the extraction tariff 10. A part is introduced directly through a line 60 into the furnace 25 and there with the semi-coke and mixed with the additional binder in the waelz zone inside the furnace. Another Part of the coal can also be routed around the extraction zone and directly through a conduit 70 are introduced into the Ticftemperaturverkokungszone 30, in which they together with the extraction residue is coked or carbonized with the formation of semi-coke and tar. If in the low temperature coking zone 30 more semi-coke is produced than is required in the process, the excess can Amount can be withdrawn through a line 33. The individual amounts of coal that the extraction zone and the coking zone are regulated so that the required binding agent is available in sufficient quantity. Because coking or smoldering is cheaper than extracting, is it worth seeing to use the coking or smoldering to the greatest possible extent and still use the to obtain the total amount of binding agent required. Otherwise, however, that shown in FIG. 2 runs Process in the same way as the process of FIG. 1.

For this purpose 2 sheets of drawings

Claims (5)

Patent claims: 1. Process for the production of agglomerates for the production of molded coke from weakly baking coke or non-baking charcoal, which is a mixture of carbonaceous solids and a carbonaceous binder rolled in a rotary kiln to extract agglomerates and tar and in which an insufficient amount of the required carbonaceous binder autogenous in the rotary kiln, is produced by itself, characterized in that at least part of the starting coal by means of extracted from a solvent at elevated temperature, most of the solvent separated from the extract and a non-distillable fraction formed and this in the rotary kiln together with the carbonaceous solids in the molding of moldings necessary formation temperature is heated, which is sufficient to the non-distillable Fraction flowable and the carbonaceous solids make it sticky and the formation to bring about the agglomerates. 2. The method according to claim 1, characterized in that the solid residue from the Coal extract is separated and thereupon a low temperature coking to produce Hdibkoks and tar and that at least part of the semi-coke is introduced into the rotary kiln. 3. The method according to any one of claims 1 or 2, characterized in that the entire Initial coal quantity, which consists entirely of non-baking coal, the extraction treatment is subjected to the solvent. 4. The method according to any one of claims 1 or 2, characterized in that a low-baking initial charcoal is divided into three partial amounts, the first partial amount is subjected to the extraction treatment with the solvent, the second portion is fed directly to the rotary kiln and the third part with the production of semi-coke and tar is subjected to cryogenic coking, at least part of the semi-coke is introduced into the rotary kiln. 5. The method according to any one of claims 1 to 4, characterized in that the solvent in the case of solvent extraction, a middle distillate fraction of all or part of the tar produced in the process is used.