WO2013152959A1

WO2013152959A1 - Process and apparatus for briquette production

Info

Publication number: WO2013152959A1
Application number: PCT/EP2013/056648
Authority: WO
Inventors: Hado Heckmann; Robert Millner; Johann Wurm
Original assignee: Siemens Vai Metals Technologies Gmbh
Priority date: 2012-04-10
Filing date: 2013-03-28
Publication date: 2013-10-17
Also published as: AU2013245608A1; UA113639C2; EP2836613A1; RU2014144985A; US20150027038A1; KR20140144738A; IN2014DN07769A; CA2869942A1; RU2642993C2; EP2836613B1; CN109385318A; CN104220604A

Abstract

Process for producing a briquette containing carbon carriers (2), where the carbon carriers (2) together with a binder system (3) are subjected to mixing with introduction of steam and the mixture obtained is subjected to pressing to give briquettes. Here, at least one of the steps - drying of the carbon carriers (2) before mixing, - setting of the temperature of the carbon carriers (2) to be mixed with the binder system before mixing in a predefined temperature range, - heat treatment of the briquettes after pressing, is carried out by means of direct or indirect interaction with superheated steam. Waste steam obtained here is used as at least part of the steam introduced during mixing. An apparatus for carrying out such a process has an apparatus for direct or indirect interaction with steam, from which a waste steam conduit leads and opens directly or indirectly into the mixing device.

Description

title

Method and apparatus for briquette production

Technical area

The present invention relates to a process for the production of a carbon carrier-containing briquette, wherein the carbon carriers are subjected to mixing with a binder system with the addition of water vapor and the resulting mixture is subjected to pressing into briquettes.

State of the art

In the past, hard coal briquetting was mainly used to produce particulate carbon carriers made of fine coal for use as a domestic fire or in industrial grate firing. There are therefore numerous methods of hard coal briquetting known. Hard coal briquetting is very important for the COREX® / FINEX® process for the production of molten pig iron, since this process is based on a fixed bed process in which the fixed bed is produced by lumped carbon carriers.

In these processes, which are also characterized by the term "smelting reduction process", lumped carbon carriers are combined with pre-reduced iron carriers and additives on the fixed bed surface

Melting gasifier charged. In the melter gasifier, the pre-reduced iron carriers are completely reduced and a molten pig iron and a molten slag is produced, which is obtained from time to time by tapping. The necessary for the melting heat is through Gasification of the lumped carbon carriers provided by means of oxygen. The resulting hot gases penetrate the fixed bed with the release of heat and leave the fixed bed on the fixed bed surface. In countercurrent to the hot gases molten pig iron and molten slag seep through the fixed bed and collect in its lowest area, the so-called swamp. For these processes, a sufficient permeability of the fixed bed is required, which depends on the granularity of the lumpy carbon support in charging to the fixed bed surface and the grain stability of the lumpy carbon support under the conditions on the fixed bed or in a fixed bed conditions. The grain size of the lumped carbon carriers should therefore have a sufficiently large coarse grain fraction and a limited undersize fraction when charged onto the fixed bed surface. A suitable grain size for the charged lumped carbon carriers set by screening from the starting material of the carbon carriers must not be substantially destroyed during handling until charging to the packed bed surface due to mechanical stresses. Furthermore, the granularity of the lumpy carbon carriers should keep sufficiently large coarse grain fraction and a limited lower grain fraction under the conditions prevailing on the fixed bed surface or in the fixed bed. The resistance of a particulate carbon support against the destruction of its grain when handled to charging on the packed bed surface is referred to as cold strength, the resistance of a particulate carbon support to destruction of its grain under conditions on or in a fixed bed is called hot strength.

In the case of the COREX® / FINEX® process for the production of molten pig iron, coal is usually used as a carbonaceous material. used. Commercial hard coal usually have only a proportion of 30-70% coarse grain, which can be charged directly as lumpy carbon carrier. In order to be able to use the undersize fraction in particulate carbon carriers, its briquetting is also suitable.

Unlike briquettes, where cold and hot strength are inherent properties, briquetting may favorably influence the cold and hot strength of the lumped carbon carriers produced by the nature of the process used and the characteristics of its performance.

From US No 6332911, W0200250219, W02004020555, W02005071119, WO9901583; WO2010081620 describes hard coal briquetting processes in conjunction with COREXO / FINEX®. It mentions a variety of possible binder systems for this purpose, including starch and polymers. In the mentioned embodiments, in each case binder in liquid form is mixed with the coal to be briquetted. However, starch and polymers, especially PVA, which are in solid granular to powdery consistency must be blended with high levels of water - 1 part dry binder with at least 10 parts water or more - to give a handleable liquid binder. Too little addition of water makes uniform distribution of the binder in the coal difficult. It easily forms clumps. As a result, the binding capacity of the binder is reduced, which would then have to be compensated by an additional consumption of binder. However, this is undesirable for cost reasons. If the water content of the binder is increased for this reason, it can be better distributed in the coal, but leads to a very wet

Mixture that can not be easily briquetted, because the wet mixture tends due to their adhesiveness in the Brikettpressen task increasingly bridging and the Briquettes therefore often get stuck in the molds of the press.

However, it is for a use of briquettes in the

COREXOIFINEX®- for the production of molten pig iron, it is necessary to control a briquetting process not only to optimize the strength of the briquettes, but also to limit the moisture content of the briquettes prior to use in the production of molten pig iron.

In US1121325 also the mixing of starch in powder form with coal with simultaneous use of steam has been shown. However, the steam must first be produced consuming, which burdens the economy of the process.

In the documents US3018227A, US4557733A, US1871104A steam is described in the context of the production of briquettes, but no Abdampf other process steps in the mixing step of carbon carriers and binder system is added.

Summary of the invention

Technical task

It is the object of the present invention to provide a method and an apparatus for the production of briquettes, which enables economic process control even when using steam to mix carbon carriers and binder systems. Technical solution

This task is solved by

A method of producing a carbon carrier-containing briquette, wherein the carbon carriers are subjected to a mixing with the addition of water vapor with a binder system and the resulting mixture is pressed into briquettes.

The inventive method is characterized in that

at least one of the steps from the group consisting of

- Drying of the carbon carrier before mixing, - Setting the temperature of the with the

Binder system to be mixed carbon carrier before mixing in a predefined temperature range,

- Heat treatment of briquettes after pressing, carried out, wherein

Drying of the carbon carriers before mixing, and / or

Heat treatment of the briquettes after pressing,

and or

Setting the temperature of the carbon carrier to be mixed with the binder system before mixing into a predefined temperature range, by means of direct or indirect interaction with a superheated steam, and used in the interaction occurring Abdampf at least as a subset of the added during mixing water vapor.

The carbon carriers are preferably carbon carriers with a particle size of less than 4 mm, determined by sieve analysis. Such carbon carriers are also referred to as fine coal in this application.

Preferably, the carbon carriers comprise coal, more preferably hard coal, most preferably the carbon carriers are hard coal. The carbon carriers may also include or consist of coke, petroleum coke, carbonaceous dusts, carbonaceous muds. A single type of carbon carrier, for example a single type of coal, may be used, or mixtures of different types of carbon carriers, for example, different types of coal or coal. By one type of carbon carrier is meant, for example, carbon carriers of a source of origin, or carbon carriers of a degree of coalification, or for example only metallurgical coals or only thermal coals. By various types of carbon carriers is meant, for example, carbon carriers of different sources of origin, or carbon carriers with different levels of carbonization, or, for example, metallurgical carbon and thermal carbon.

In the method according to the invention carbon carriers are processed into briquettes by the carbon carriers are mixed with a binder system with the addition of steam and the resulting mixture is pressed into briquettes. As a result of the use of water vapor significantly higher strengths of the briquettes are achieved with the same consumption of binder system compared to methods without steam.

The water vapor - or its properties, that is to say its quality - which is added during mixing, influences the properties of the briquettes obtained - for example via the amount of water introduced into the mixture or via the amount of energy introduced. The quality of water vapor in terms of energy content and

Water content per unit of mass Steam can be adjusted, for example, by the extent of overheating in superheated steam or by the extent of condensation in wet steam. For this purpose, water vapors of different quality can be mixed. Also via the added amount of water vapor and / or over the duration of the addition, the mixing with regard to an optimization of the briquette quality is adjustable.

The binder system comprises at least one binder and, if appropriate, further substances, for example solvents for the binder. A binder in this context is a substance by which solids with a fine degree of dispersion, for example powder, are glued together.

In one embodiment, the binders are poorly water-soluble substances; Hardly water-soluble is to be understood as meaning a substance which, for complete dissolution at 20 ° C., requires a ratio of the proportions by weight of water to binder of equal to or greater than 5: 1.

Binders are for example starch or polyvinyl acetate PVA. As the binder system, for example, starch dissolved in water can be used. In the method according to the invention, at least one of the steps is selected from the group of steps

consisting of - drying the carbon carriers before mixing,

Setting the temperature of the carbon carrier to be mixed with the binder system before mixing in a predefined temperature range,

- Heat treatment of the briquettes after pressing, carried out. If the carbon carriers have too high a moisture content for the production of briquettes having an acceptable moisture content, they are dried according to the invention before they are mixed with the binder system. Preference is given to a moisture having a water content of less than or equal to 7% by mass, more preferably a moisture having a water content of less than or equal to 5% by mass.

By adjusting the temperature of the carbon carriers to be mixed with the binder system, the strength properties of the briquettes can be influenced. Therefore, according to the invention, if appropriate, before mixing, the temperature of the carbon support to be mixed with the binder system is adjusted to a predefined temperature range selected with regard to the desired strength properties.

The temperature of the carbon supports first determines the amount of heat that must be supplied with the water vapor to adjust to the desired temperature for mixing the binder system with the carbon carriers. Depending on- How much energy is removed from the steam by heating up the carbon carriers is condensed to varying extents. If the moisture of the mixture, which is altered, for example, by this condensation, is in an adequate ratio to the amount of binder system used, the strength of the briquettes is favorably influenced.

According to the invention, if necessary, a heat treatment - for example, a heating -, which may be one or more stages, the briquettes after pressing. By the heat treatment, the strength properties of the briquettes can be influenced in terms of curing. According to the invention, at least one of the method steps takes place

Drying of the carbon carriers before mixing,

Heat treatment of the briquettes after pressing,

by direct or indirect interaction with superheated steam.

In the case of direct interaction, the superheated steam and the carbon carriers or briquettes come into contact with one another, heat transfer taking place.

In indirect interaction, the superheated steam and the carbon carriers or briquettes materially do not come into contact; Heat transfer takes place, for example, through a wall.

After completing one or more of the tasks

Drying of the carbon carriers before mixing,

Heat treatment of the briquettes after pressing, Setting the temperature of the carbon carrier to be mixed with the binder system before mixing in a predefined temperature range,

Due to the superheated steam, a so-called waste steam with a lower temperature than the superheated steam is produced.

The mixing can be carried out under batchwise addition of material or with continuous addition of material.

Under heat treatment is heat, so warming to understand, but not heat dissipation, so cooling.

Advantageous Effects of the Invention

According to the invention, exhaust steam produced during the direct or indirect interaction is used at least as a partial amount of the water vapor added during the mixing. It can be used in such a way the entire exhaust steam or part of the resulting exhaust steam. As a result, the efficiency of the method is increased because the exhaust steam is energetically and materially used for heating and as a solvent for the binder system in the mixing. According to a preferred embodiment, in the process according to the invention, the binder system in the solid state, preferably dry, is mixed with the carbon carriers. In this way, the binder system can be better mixed with the carbon carriers than if, for example, a viscous binder system were used.

According to a further embodiment, the binder system in the liquid state is mixed with the carbon carriers. mixed; This is especially used for liquid binder systems.

According to a further embodiment, the binder system is mixed with the carbon carriers in a first mixing step to form a premix,

and subjecting the premix to a second mixing step with the addition of water vapor. Then the steam meets an already largely homogenized mixture of carbon carriers and binder system.

In accordance with a further embodiment, the entry temperature of the premix is set to a predefined temperature range on entry into the second mixing step. This, too, can influence the properties of the briquettes obtained, as already discussed above.

In accordance with a further embodiment, the inlet temperature of the premix is adjusted by adjusting the temperature of the carbon carrier supplied to the first mixing step to a predefined temperature interval. Then, the premix does not need to be extra heated in the mixing device in which it is produced, which means less equipment.

According to a further embodiment, a regulation and / or control of the second mixing step takes place by changing at least one of the parameters from the group consisting of the members

Amount - in batchwise operation -, for example in kg, or mass flow - in continuous operation -, for example in kg / time unit, the carbon carrier, Inlet temperature of the carbon carriers from the first mixing step or inlet temperature of the premix into the second mixing step,

Entry moisture of the carbon carriers from the first mixing step or inlet moisture of the premix,

Amount of added water vapor relative to the amount of carbon carriers,

Pressure and / or temperature of the water vapor added, water addition, preferably in a desired ratio to the amount of carbon carriers in the second mixing step,

- amount of water vapor - in batchwise operation -, for example in kg, or water vapor flow rate - in continuous operation -, for example, in kg / time unit,

- Duration of the addition of the steam, preferably a duration of 0.5 to 30 minutes, more preferably from 2 to 7 minutes.

The amount of added water vapor relative to the amount of carbon carriers in the second mixing step is preferably controlled by one of the following parameters:

- amount of water vapor - in batchwise operation -, for example in kg,

- Water vapor flow rate - in continuous operation -, for example in kg / time unit,

Duration of the addition of the steam - in the case of batchwise operation -, preferably a duration of 0.5 to 30 minutes, more preferably of 2 to 7 minutes,

- In continuous operation residence time of the steam and / or premix in the second mixing step.

If, during batchwise operation over the duration of the addition of the steam, the amount of water vapor added is controlled relative to the amount of carbon carriers in the second mixing step, this of course presupposes knowledge of the prevailing steam flow rate in this time. According to a further embodiment, in at least one member of the group consisting of the members - adjustment of the inlet temperature of the premix when entering the second mixing step in a predefined temperature range,

- Adjustment of the inlet temperature of the premix by adjusting the temperature of the carbon carrier supplied to the first mixing step to a predefined temperature interval, direct or indirect interaction with water vapor. Preferably, superheated steam is used.

According to a further embodiment, exhaust steam occurring in this interaction is used at least as a partial amount of the water vapor added during the mixing. This has the advantage that it is introduced materially and energetically back into the process.

Advantageously, the binder system contains starch.

Starch is cheap and readily available and not harmful to the environment.

In another embodiment, the binder system contains at least one member selected from the group consisting of members

- synthetic polymers,

- monomers which polymerize under the conditions of the second mixing step to give synthetic polymers,

- under the conditions of drying the briquettes obtained in the pressing to synthetic polymers polymerizing monomers. By synthetic polymers is meant for example:

Styrene-butadiene copolymers,

- acrylates, - thermoplastics and synthetic resins such as

o polystyrene,

o polyethylene,

o polyvinyl alcohol,

o Polyethylene wax,

o phenolic resin,

o xylene formaldehyde resin,

- Polyurethanes such as

o Polythene

o polyisocyanates

Preferably, the binder system contains

Polyvinyl acetate. Polyvinyl acetate is readily available in large quantities and can be prepared, for example, according to claim 12 in the course of a process for producing pig iron.

According to a further embodiment, the carbon carriers are added to the hot strength of briquette increasing components in an amount of 1 to 10 mass%, based on the mass of the carbon carriers supplied to the mixing. These may be, for example, bitumens in granular

Form or as a drop spray, dusts / sludges from metallurgical processes, coals act with respect to the carbon carriers increased hot strength. According to a further embodiment of the method according to the invention, the mixture is subjected to a pre-agglomeration before it is subjected to compression to briquettes. The pressing of pre-agglomerated mixture brings advantages in terms of the properties of the briquettes, especially a higher density, which leads to firmer briquettes.

Another object of the present application is the use of briquettes produced by the process according to the invention in a process for the production of pig iron with gasification of the carbon carriers.

Preferably, in the process for the production of pig iron with gasification of the carbon carrier resulting waste heat me to produce at least a subset of a method in which he used according to the invention

Steam used.

Another object of the present application is a method in which the binder system holds polyvinyl acetate ent, wherein the polyvinyl acetate is at least partially generated from monomers by means of a synthesis gas, which in in the inventive method for producing pig iron with gasification of the carbon carrier resulting export gas are obtained, with conversion of CO of the synthesis gas via acetic acid in vinyl acetate.

A further subject of the present application is a device

suitable for carrying out a method according to the invention with a mixing device for mixing carbon stock carriers with a binder system,

and with a pressing device for pressing briquettes based on a mixture obtained from the mixing device, wherein the mixing device a

Steam feed line for the addition of water vapor comprises, characterized

that at least one member of the group consisting of

Dryer for drying carbon carriers,

Heat treatment device for heat treatment of the briquettes,

There is a device for changing the temperature of the carbon carriers prior to entering the mixing device,

in which

- the dryer, and / or

- The device for changing the temperature of the carbon carrier before entering the mixing device, and / or

- The heat treatment device for heat treatment of the briquettes, a device for direct or indirect interaction with water vapor, in which a water vapor feed line for feeding water vapor opens, and from which an exhaust steam line, and wherein the exhaust steam line in the Wasserdampfzugabeleitung and / or in the Mixturing device opens. When in

- Dryer, and / or

Device for changing the temperature of the carbon carriers before entering the mixing device, and / or heat treatment device for heat treating the briquettes,

the pressure is increased in relation to the environment, pressure equalizing locks are installed before and after the respective unit for the materials in the respective units - for example carbon carrier, mixture, briquettes.

For example, pressure balancing locks for the briquettes are installed when the pressure in the heat treatment apparatus for heat treating the briquettes from the environment is increased.

The mixing device can be operated batchwise or continuously. The device for changing the temperature of the carbon carriers prior to entry into the mixing device can be designed, for example, as a heatable chamber.

In a preferred embodiment, the dryer is the device for changing the temperature of the carbon carriers before entering the mixing device. This reduces the expenditure on equipment, maintenance, and investment and operating costs. The heat treatment device for heat treatment of the briquettes may be formed, for example, as a heatable chamber. In one embodiment, there is a carbon carrier reservoir from which a carbon carrier discharge conduit discharges into the dryer. Preferably, the carbon carrier storage is provided with a device for changing the temperature of carbon carriers located in the carbon carrier storage. This allows no extra aggregate to be needed to change the temperature of the carbon carriers. Preferably, the mixing device comprises

a premixer for carrying out a first mixing step,

a binder feed line opening into the premixer for adding a binder system to the premixer,

- a carbon carrier discharging into the premixer

Addition line for the addition of carbon carriers, preferably carbon carriers from the dryer, in the premixer,

- A final mixer for performing a second mixing step, in which the Wasserdampfzugabeleitung opens.

Preferably, the premixer comprises means for changing the temperature of premixing in the premixer; for example, by a heat transfer medium such as steam or thermal oil flowed through or electrical heating elements.

Preferably, a device for controlling and / or controlling the

per time unit

and or

per unit of material to be briquetted

in the final mixer einbringbaren amount of water vapor available. As a result, the efficiency of the method according to the invention can be increased by optimally adjusting the treatment conditions to the mixture to be briquetted. Preferably, at least one member of the group is composed of the members

Device for changing the temperature of pre-mixing in the pre-mixer,

- Device for changing the temperature of carbon carriers located in the carrier carbon, a device for direct or indirect interaction with water vapor, in which a water vapor feed line for feeding water vapor opens. In this way, the changes in temperature can be made with the help of water vapor.

According to embodiments, the exhaust steam line opens into the Wasserdampfzugabeleitung and / or in the mixing device.

According to another embodiment, the Abdampfleitun opens into the final mixer.

According to embodiments, premixers and final mixers are combined in an apparatus unit in the mixing device. This reduces the expenditure on equipment, maintenance, and investment and operating costs.

According to a further embodiment, the erfindungsge Permitted device also comprises a device for pre-agglomeration of the mixture prepared in the mixing device. This is then connected via a mixture supply line with the mixing device, and with a

Voragglomeratableitung connected to the pressing device for pressing briquettes. Optionally, the mixture prepared in the mixing device is introduced into an optional pre-agglomeration device prior to introduction into the device. Kneaded kneading hand kneading. As a result, the consistency of the mixture for the briquetting process is improved compared to the state after the mixing device. In the context of the present application, the term steam always means steam.

Brief description of the drawings

Hereinafter, the present invention will be explained with reference to some schematic exemplary figures.

FIG. 1 shows a schematic representation of a device according to the invention.

FIG. 2 schematically shows the use of briquettes produced according to the invention in a process for the production of pig iron with gasification of the carbon carriers and the use of accumulating export gas for the production of pig iron

Polyvinyl acetate.

Description of the embodiments

FIG. 1 shows a device according to the invention with a mixing device 1 for mixing carbon carriers 2 with a binder system 3. The device also has a pressing device 4 for pressing briquettes on the basis of a mixture obtained from the mixing device 1. The mixing device 1 a

Steam feed line 5 for the addition of water vapor. Furthermore, there are a dryer 6 for drying the carbon carriers 2 and a heat treatment device 7 for heat treatment of the briquettes.

The dryer 6 is a device for indirect interaction with water vapor, and the heat treatment device 7 for heat treatment of the briquettes is a device for direct interaction with water vapor; in both opens That is, a water vapor feed line 8a, 8b for feeding in steam, and from both, a vapor line 9a, 9b respectively exits, the vapor line 9a discharging into the water vapor feed line 5 and the exhaust line 9b discharging into the mixing device 1.

The carbon carriers 2, in this case a mixture of fine carbons of different origin and different grain size, are subjected to mixing with the addition of steam in the mixing device 1 with a binder system 3, in this case starch powder. The resulting mixture is then subjected to pressing in the pressing device 4 into briquettes. Drying in the drier 6 takes place up to a water content of less than or equal to 7% by mass. The drying of the carbon carriers prior to mixing and the heat treatment of the briquettes after the pressing takes place by means of superheated steam supplied via the steam feed lines 8a, 8b. The resulting exhaust steam is introduced via the exhaust steam line 9a in the water vapor feed line 5 and the exhaust steam line 9b in the mixing device 1, where it is a subset of the added during mixing water vapor.

Mixing device 1 comprises a premixer 10 for performing a first mixing step, and an end mixer 11 for performing a second mixing step. In the mixing device 1 premixer 10 and end mixer 11 are combined in one unit.

A binder feed line 12 for adding the binder system 3 into the premixer 10 opens into the premixer 10. A carbon feed addition line 13 for adding carbon carriers 3 from the drier 6 into the premixer 10 also flows into the premixer 10. In the final mixer 11, the water vapor feed line 5 opens in a first mixing step For example, the binder system 3 in the pre-mixer 10 is mixed with the carbon carriers 2 to form a premix, and the premix is subjected to a second mixing step in the final mixer 11 with the addition of water vapor via the steam feed line 5. A device 14 for controlling and / or controlling the amount of steam that can be introduced into the final mixer per unit of time and / or per unit of quantity of material to be briquetted is present in the water vapor feed line 5. This can be a regulation and / or control of the second mixing step by changing at least one of the parameters from the group consisting of the members

Amount - in batchwise operation -, for example in kg, or mass flow - in continuous operation -, for example in kg / time unit, the carbon carrier,

Inlet temperature of the carbon carriers from the first mixing step or inlet temperature of the premix into the second mixing step,

Entry humidity of the carbon carriers from the first mixing step or inlet moisture of the premix,

Amount of added water vapor relative to the amount of carbon carriers,

Pressure and / or temperature of the added water vapor,

Adding water, preferably in a desired ratio to the amount of carbon carriers in the second mixing step,

- Duration of the addition of the water vapor, preferably a duration of 0.5 to 30 minutes, more preferably from 2 to 7 minutes, take place.

Such devices for control and / or control are also present in the exhaust steam lines 9a, 9b, but not shown for reasons of clarity. The dryer 6 is at the same time a device for changing the temperature of the carbon carriers prior to entry into the mixing device. With this dryer 6, the inlet temperature of the premix can be adjusted to a predefined temperature range on entering the second mixing step by setting the temperature of the carbon carrier 3 supplied to the first mixing step to a predefined temperature interval. In addition, a pre-mix inlet temperature setting (entering the second mixing step into a predefined temperature range may be accomplished by means of a pre-mix temperature changing device 15 of the pre-mixer.) These pre-mix inlet temperature settings on entry Indirect interaction with water vapor takes place in the second mixing step, and exhaust steam produced in such an interaction can be used as a constituent of the water vapor which is fed to the final mixer 11, which, however, for the sake of clarity, just like a

Wasserdampfeinspeisleitung for feeding water vapor to the device 15 is not shown separately.

The carbon carriers 2 are fed from a carbon carrier storage 16, in which they are stored before being supplied to the mixer 6, via a carbon carrier discharge line 17 into the dryer. The carbon carrier storage 16 is provided with a device 18 for changing the temperature of carbon carriers 2 located in the carbon carrier storage. This device 18 is a device for indirect interaction with

Water vapor into which a water vapor feed line, which is not shown separately for reasons of clarity, leads to the introduction of water vapor. Before pressing of briquettes, a pre-agglomeration may take place by means of a device 28 for pre-agglomeration of the mixture produced in the mixing device 1. Optionally, the mixture produced in the mixing device 1 is kneaded before introduction into the device 28 for pre-agglomeration in an optionally present kneader 29.

The briquettes produced according to the invention are used in a process for the production of pig iron with gasification of

Carbon carriers used; FIG. 2 shows this schematically for a COREX® process. Briquettes taken from the heat treatment device 7, in which briquettes are hardened, are fed to a coal bunker 19, into which bitcoil 20 is also filled. From the coal bunker 19, this material is fed to a melter gasifier 21. In these iron carriers are entered; under gasification, inter alia, the carbon carrier is recovered liquid pig iron. By means of heat exchanger 22, heat for the purpose of producing at least a partial amount of the steam used in the process according to the invention can be withdrawn from the so-called generator gas withdrawn from the melter gasifier 21. After treatment in a de-dusting device, which is not shown separately for reasons of clarity, the generator gas is used as reducing gas in the reduction unit 23, in which the iron carriers intended for input into the melter gasifier are generated. After flowing through the reduction unit 23 so-called top gas 24 is withdrawn from the reduction unit 23. Heat can also be extracted therefrom, for example by means of heat exchanger 25, in order to produce at least a subset of the water vapor used in the process according to the invention. FIG. 2 shows how, after passing through the heat exchanger 25, the cooled top gas is removed, optionally after further, not shown. presented treatment steps - is used as export gas 26 in a binder factory 27 for the production of binder for a binder system used according to the invention. In this case, a carbon monoxide-rich synthesis gas is produced from the export gas and polyvinyl acetate is produced by its conversion via acetic acid and vinyl acetate.

While the invention has been further illustrated and described in detail by the preferred embodiments, the invention is not limited by the disclosed examples, and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention.

201208232

List of reference numbers

1 mixing device

2 carbon carriers

3 binder system

4 pressing device

5 steam supply line 6 dryer

7 heat treatment device

8a, 8b water vapor feed 9a, 9b exhaust steam line

10 premixers

11 final mixer

12 binder feed line 13 carbon carrier feed line

14 device for regulation

and / or controlling the quantity of water vapor which can be introduced into the final mixer per unit of time and / or per unit of quantity of material to be briquetted

15 Device for changing the

Temperature of premix pre-mix

16 carbon carrier storage 17 carbon carrier output line

Device for changing the temperature of carbon carriers in the carbon carrier storage

19 coal bunkers 20 pieces of coal

21 melter gasifier

22 heat exchangers

23 reduction unit

24 topgas

25 heat exchangers

26 export gas

27 binder factory

28 apparatus for Voragglomera ^¬ tion

29 kneader

Claims

claims

1. A process for the production of a carbon carrier (2) containing briquettes, wherein the carbon carriers (2) are subjected to a mixing with the addition of water vapor by a binder system (3) and the resulting mixture is pressed into briquettes,

characterized in that

at least one of the steps from the group consisting of

Drying of the carbon carriers (2) before mixing,

- Setting the temperature of the with the

Binder system (3) to be mixed carbon carrier (2) before mixing in a predefined temperature range,

- Heat treatment of briquettes after pressing, carried out, wherein

Drying of the carbon carriers (2) before mixing, and / or

Heat treatment of the briquettes after pressing,

and or

Adjusting the temperature of the carbon carrier (2) to be mixed with the binder system (3) before mixing into a predefined temperature range, by means of direct or indirect interaction with a superheated steam, and used in the interaction occurring Abdampf at least as a subset of the added during mixing water vapor.

2. The method according to claim 1, characterized in that the binder system (3) with the carbon carriers (2) is mixed in a first mixing step to a premix,

and the premix is subjected to a second mixing step with the addition of the water vapor.

3. The method according to claim 2, characterized in that the inlet temperature of the premix is set when entering the second mixing step in a predefined temperature.

4. The method according to claim 3, characterized in that the inlet temperature of the premix is adjusted by adjusting the temperature of the first mixing step supplied carbon support (2) in a predefined temperature interval.

5. The method according to any one of claims 2 to 4, characterized in that in at least one member of the group consisting of the members

Setting the inlet temperature of the premix when entering the second mixing step into a predefined temperature range,

Setting the inlet temperature of the premix by adjusting the temperature of the carbon carrier (2) supplied to the first mixing step to a predefined temperature interval, direct or indirect interaction with water vapor takes place.

6. The method according to claim 5, characterized in that is used in the interaction incurred Abdampf at least as part of the added during mixing water vapor.

7. The method according to any one of claims 1 to 6, characterized in that the binder system (3) contains starch.

8. The method according to any one of claims 1 to 6, characterized in that the binder system contains at least one component selected from the group consisting of the members

- synthetic polymers,

polymerizing monomers to synthetic polymers under the conditions of the second mixing step,

- monomers polymerizing under the conditions of drying the briquettes obtained in the pressing to synthetic polymers; this ingredient is preferably polyvinyl acetate.

9. The method according to claim 8, characterized in that the polyvinyl acetate is at least partially produced from monomers which by means of a synthesis gas, which in in the inventive method for producing pig iron according to claim 10 or 11 under gasification of the carbon carrier (2) accruing export gas based, with conversion of CO of the synthesis gas are obtained via acetic acid in vinyl acetate.

10. Device,

suitable for carrying out a method according to the invention, with a mixing device (1) for mixing carbon carriers (2) with a binder system (3), and with a pressing device (4) for pressing briquettes based on a mixture obtained from the mixing device (1),

wherein the mixing device (1) a

Steam feed line (5) for the addition of water vapor,

characterized,

that at least one member of the group consisting of

- dryer (6) for drying carbon supports (2),

Heat treatment device (7) for heat treatment of the briquettes,

- Device for changing the temperature of the Kohlenstoffträ ger (2) before entering the mixing device (1), is present,

in which

- The dryer (6), and / or

- The device for changing the temperature of the carbon carrier (2) before entering the mixing device (1), and / or - The heat treatment device (7) for heat treatment of the briquettes, a device for direct or indirect interaction with water vapor, in which a steam feed line (8a, 8b) opens for supplying water vapor, and from which an exhaust steam line (9a, 9b) emanates , and wherein the exhaust steam line (9a, 9b) in the

Wasserdampfzugabeleitung (5) and / or in the mixing device (1) opens.

11. Device according to claim 10, wherein there is a carbon carrier store (16) from which a carbon carrier output line (17) discharges into the dryer (6), characterized in that the carbon carrier store (16) is provided with a device (18) for changing the temperature of carbon carriers (2) located in the carbon carrier store (16).

12. Device according to one of claims 10 to 11, characterized in that the mixing device (1) comprises

a pre-mixer (10) for carrying out a first mixing step,

a binder feed line (12) opening into the premixer (10) for adding a binder system (3) into the premixer (10),

a carbon carrier feed line (13) opening into the premixer for adding carbon carriers (2), preferably carbon carriers (2) from the dryer (6), into the premixer (10), - An end mixer (11) for carrying out a second mixing step, in which the Wasserdampfzugabeleitung (5) opens.

13. The apparatus according to claim 12, characterized in that the premixer (10) has a device (15) for changing the temperature of the premixer (10) befindlicher premix.

14. Device according to one of claims 10 - 13, characterized in that at least one member of the group consisting of the members

Device (15) for changing the temperature of premix (10) in the premixer (10),

- Device (18) for changing the temperature of carbon carriers in the carrier (16) located carbon carriers

(2), a device for direct or indirect interaction with water vapor, in which a

Steam supply line (8a, 8b) opens for the supply of water vapor.

15. The device according to any one of claims 10-14, characterized in that in the mixing device (1) premixer (10) and end mixer (11) are combined in an apparatus unit.