DD297438A5 - DEVICE AND METHOD FOR THE PRODUCTION OF COAL MICA - Google Patents

Abstract

The invention relates to an apparatus and a method for producing Kohlemaische, wherein the mash is suitable as a feedstock for the production of liquid fuels by high pressure hydrogenation or for direct energy use. The invention is characterized in that the discharge device of a heatable Turmreibmuehle is followed by a classifying unit integrated into the Mahlgefaesz and the grinding and mixing of coal, mash and optionally catalyst in the inventive device at a temperature of greater than 150C so takes place, soz the Entwaesserung on less than 3% and a final classification on less than 500 m product fineness in one process step. {Kohlemaische; liquid fuel and fuel; high-pressure hydrogenation; Turmreibmuehle; Mahlgefaesz; integrated classification unit; Mixture; grinding; Drainage; Temperature; classification; Product fineness}

Description

For this 1 page drawings

Field of application of the invention

The invention relates to an apparatus and a method for producing Kohlemaische from hydrous coal, oil and optionally catalyst. This mixture is particularly suitable as a feedstock for the production of liquid bi fuels and fuels by high-pressure hydrogenation or for direct energy use.

Characteristic of the known state of the art

From the literature, z. B. Liesner, A., and Thau, Α .: The chemistry of lignite, Vol. II, Hall 1953.5.264 et seq., It is known that an intensive dispersion of the coal in the oil used for mashing for a high yield of liquid Products of high pressure hydrogenation is of great importance. In addition, the water content of the mash should be as low as possible and an upper grain boundary of the solid components in the mash should not be exceeded. It is therefore a multi-stage predrying in combination with a dry crushing, the mashing of dry coal and optionally catalyst with oil in mixers, mills or stirred tanks to a pumpable mash and the separation of coarse material and uncomminuted foreign bodies by screening held to be necessary.

For the drying and dry comminution a great energy expenditure and extremely expensive measures for the safety technology are necessary. In addition, by the applied drying technology a strong thermal stress of the coal constituents and their partial oxidative decomposition determine, which has a negative effect on the hydrogenation yield.

A gentle drying of the mash can according to the invention in DE-312 060 2 and Garnish, I. F., u. a., Chemical Engineering Progress, New York 80/198411, pp. 42-47

water-containing coal and the high-boiling oil are heated with a low-boiling solvent optionally under pressure and the water is removed with the low-boiling solvent as a tractor. In this method, several process steps are necessary, which require a large amount of energy and equipment and have disadvantages in the management.

These disadvantages are to be eliminated by the DD invention description. There, a method for producing a dehydrated coal-oil mixture is proposed, in which hydrous coal and hot mash oil so vie optionally catalyst thoroughly mixed in a tube mill and ground simultaneously and the partially dewatered mixture is treated in a further process step with stirring and optionally heat ,

The disadvantage of this solution is the subsequent screening of the mash in a further process step.

Also known is a method for producing a liquid combustion material according to DE-OS 3021071.

In a rotary screw vertical grinder filled with a liquid fuel, coarse, pre-dried fuel particles are crushed by grinding media, with the components uniting into a mixture coming out of the mill

is removed. Still coarser fuel particles must be externally separated consuming and again the

Be fed grinding process. For hydrous fuels, eg. B. coal, dan method is not designed so that the aforementioned disadvantages of Preliminary action to take effect. The vertical abrasion mills consist of simple ungraded grinding vessels, depending on the operating mode

closed (overflow mill) or perforated Mahlgefäßböden (continuous mill) are used. Both the discharge in the

Overflow and in the run are in the mash production by the high viscosity of regrind and grinding medium

problematic and require a variety of external ancillary equipment, due to the need for accurate

Vote the handling complicates the overall process at least. The used double-course Worm stirrers are basically operated as an upward conveyor, resulting in a specific grinding element movement

results. Also known are solutions in which the stirrer forms an annular gap with the grinding vessel bottom, through which the product discharge is realized. However, this direct annular gap discharge represents a huge source of interference for the

Operation of the mill. The difficulties of ball absorption by the stirrer and in maintaining a uniform annular gap width are

enormously. Problematic are still up to gap abgenu tected grinding media that can cause considerable damage.

Object of the invention

The aim of the invention is an apparatus and a method for the cost-effective production of a coal-oil mixture for the production of liquid fuels by high-pressure hydrogenation or for a direct energy use.

Explanation of the essence of the invention The invention has for its object to develop an apparatus and a method for the production of Kohlemaische,

a grinding and mixing of hydrous coal and mash oil as well as a simultaneous drainage and

Allow classification of the mixtures. According to the invention, this object is achieved in that the discharge of a heated tower grinder a in

the grinding vessel (1) is arranged downstream classifying unit (5), which consists of a pot with discharge device, in which at least one sieve insert (6) is arranged, in which a with the screw (2) directly connected agitator (4) rotates with the sieve insert (6) forms an annular gap. Essential to the invention is that the pot is designed to be heated.

Furthermore, it is characteristic that the sieve inserts are interchangeable, conical or cylindrical and one Deduction for coarse material or uncomminable foreign bodies included. Furthermore, it is essential to the invention that the stirring element (4)

a conveying direction opposite to the screw agitator (2) of the mill.

According to the invention the object is further achieved in that the grinding and mixing in the inventive Device at a temperature of> 15O ⁰ C so that the drainage to <3% and a final classification

be realized on <500 microns product fineness in one process step. At a grinding temperature above 1SO ⁰ C is the

Kinetics of water evaporation accelerates, so that the drainage of the Kohlemaische is favored. Furthermore, it is characteristic that the reclassification in the classifying unit (5) is promoted by applying a negative pressure The advantages of the invention are that necessary for the preparation of Kohlemaische grinding, drainage and Classification can be realized in one step. Compared to the state of the art, they can be achieved

Comparable results when using the device according to the invention and the method necessary times are significantly shortened.

Hereinafter, the inventors. , explained in more detail with reference to two embodiments. embodiment FIG. 1 shows an exemplary embodiment of a device according to the invention for producing coal mash. According to FIG. 1, the device consists of a tower grinder with grinding vessel 1 and discharge device 3, which has an opening in the Grinding vessel integrated classification unit 5 with sieve insert 6 and 8 discharge downstream. That within the Sieve insert 6 rotating stirrer 4 is fixed by the discharge device 3 through with the worm 2 Tower grinder connected, but has a screw mixer 2 opposite conveying direction. Stirrer 4 and Sieve insert 6 form a continuously tapered annular gap 7. The feed material, coal with 5-20% Fauchtegehalt and mash oil (T 2150 ⁰ C), in the grinding vessel 1 using the above Worm stirrer 2 agitated media filling mixed and approximate product quality (R ₂ Oo ^ 10%, water content <

5%).

Through the discharge device 3, the mash reaches the integrated classifying unit 5 without the remaining grinding media

and is pressed by the flexible edges of the stirring member 4 through the openings of the sieve insert 6. The sieving process can be assisted by applying a negative pressure to the classifying unit 5. Heavy oversize grain passes over the inclination of Siebeinsatzas 6 to the narrowest point of the between the discharge of Siebeinsatzes 7 and the

Stirrer 4 forming annular gap, whereupon it leaves the stress zone, together with the passage of the Sieve insert 6 the discharge opening 8 happens. Figure 2 shows another embodiment of the 6rfindungsgemäßen device in which the sieve insert 6 in eil em

cylindrical sump 9 ends so that sieve passage and sieve residue can be removed separately.

Claims (8)

1. An apparatus for the production of charcoal mash in tower mills, consisting of a vertical with Mahlkörpern filled grinding tube with screw agitator and a task and discharge device, characterized in that the discharge of the heat mill in the grinding vessel (1) integrated classification unit (5) is arranged downstream, which consists of a pot m! t discharge device (3), in which at least one sieve insert (6) is arranged, in which a with the screw (2) directly connected stirrer (4) rotates, with the sieve insert (6) an annular gap forms. 2. Apparatus according to claim 1, characterized in that the pot is heated. 3. Apparatus according to claim 1, characterized in that the sieve inserts are interchangeable. 4. Apparatus according to claim 1, characterized in that the sieve inserts are cylindrical or conical. 5. Apparatus according to claim 1, characterized in that the sieve inserts have a deduction for coarse material or unzerkleinerbare foreign body. 6. Apparatus according to claim 1, characterized in that the stirring member (4) has a screw mixer (2) of the mill opposite conveying direction. 7. A process for the preparation of Kohlemaische, which is produced by intensive mixing and simultaneous grinding of coal with a water content of about 5 is 20% and mash oil and optionally catalysts, characterized in that the grinding and mixing in the device according to the invention at a temperature greater than or equal to 15O ⁰ C carried out so that the drainage to less than 3% and a final classification to less than 500 pm product fineness are realized in one process step. 8. The method according to claim 7, characterized in that in the classifying unit (5), a negative pressure is applied.