KR20110082522A - Method and installation for the uninterrupted supply of a gasification plant with fuel - Google Patents

Abstract

FIELD OF THE INVENTION The present invention relates to a method and a facility for providing uninterrupted supply of fuel to a gasification plant for generating biosynthetic gas, wherein via means of transfer the fuel is supplied from a fuel reservoir to a mill drying facility and then produced fuel The powder is supplied to the fuel storage container, from there to the powder receiving container, and finally to the gasifier. It is an object of the present invention, in particular, to increase facility availability and at the same time minimize storage capacity to achieve cost reduction. This is achieved by powdered fuel from at least two mill drying facilities being supplied to the storage container via conveying means, at least one of which is acted upon by the at least two mill drying facilities as a powder conveying device.

Description

METHOD AND INSTALLATION FOR THE UNINTERRUPTED SUPPLY OF A GASIFICATION PLANT WITH FUEL}

The present invention relates to a method and a facility for the uninterrupted supply of fuel to a gasification plant for generating raw syngas, of the kind described in claim 1 or claim 4.

By means of the same method or facility, in gasifiers finely decomposed fuels such as powdered (<0.5 mm) fuels such as coal, petroleum coke, biological waste or fuels are suspended in small particle loads (< 50 kg / m 3; not fluidized bed) Oxygen-containing gasifier is converted at temperatures above the slag melting point under elevated pressure. In carrying out the pressure gasification, the carbon containing fuel is converted with an oxygen containing gas, and the oxygen containing gas is supplied at a substoichiometric ratio, thus obtaining a carbon monoxide containing product gas. In order to achieve the fullest possible return under substoichiometric conditions, the fuel must be broken down and guided into the reactor. In general, the reaction occurs under elevated pressure.

Since the gasification reactions must be run economically if the operation is carried out continuously for longer periods of time, the amount of flowing, finely divided fuel must be as constant as possible in time units to ensure trouble-free operation. In this case, particularly mechanically operated solid guide facility parts are of course more prone to failure than are known for example for gas or liquid guide parts. Therefore, it is urgently necessary to increase the availability of the fuel supply in order to increase the availability of the entire installation. According to the prior art, possible failures are prevented through the capacity of the storage devices. That is, the raw coal silo is dimensioned to be sufficient with the stored fresh coal in the event of a failure of the feeding belt plant to ensure the operation of the gasification plant during repair. Similarly, the powdered coal silo is dimensioned so that sufficient time is given for repairing the grinding mill. With the most modern gasification methods that achieve very high plant performance, the cost of providing corresponding buffer times in storage devices is very high. In this case, the large storage volume does not only affect the cost for the original large container, but also the building facilities and auxiliary equipment to which it belongs. The method described above is known from facilities realized by the applicant and the supply to burners via a number of sluice systems is shown in DE 10 2006 029 595 A1.

It is an object of the present invention, in particular, to increase facility availability and at the same time minimize storage capacity to achieve cost reduction.

This object is, in the method of the type described in the introduction, in accordance with the invention powdered fuel from at least two mill drying installations being supplied to the storage container via transfer means, wherein at least one of the transfer means Is achieved by the action of at least two mill drying facilities as a dust transport device.

In particular, with the method according to the invention, it is ensured that the gasification plant is continuously charged with fuel even if shortages occur between the individual elements.

Implementations of the invention are indicated in the dependent claims. According to this, each of the storage containers connected upstream of each gasifier may be simultaneously operated by at least two mill drying facilities.

According to an embodiment, one powder conveying device is assigned to another powder conveying device, which powder conveying devices are simultaneously and / or separate to be effected by at least two mill drying facilities.

These implementations according to the invention actually give rise to 100% redundancy and thus a great safety of the method according to the invention.

The object described above is achieved by a facility according to the invention, which is assigned at least two mill-drying facilities and transport means for supplying powdered fuel to a powder storage container, wherein at least one transport means Is formed by two flour conveying devices, which exhibit their excellence by being operated by at least two mill drying facilities.

Other implementations of the plant according to the invention are shown in the other dependent claims, whereby each gasifier is assigned a storage container, which is operated by at least two mill-drying plants and In order to form 100% redundancy, each flour conveying device is formed by two flour conveying devices working together and / or separately, each of which is assigned two mill drying facilities. have.

At least two solid matter supply silos and one mill were assigned to each mill drying facility to supply and mix various fuels and additives, which has been found to serve the purpose.

This embodiment has the particular advantage that the corresponding fuels can be optimally configured, in which case several fuels or one fuel and one additive can be mixed, depending on the fuel type, depending on the fuel composition.

In addition, according to the invention, each powder storage container is connected to a plurality of grinding mills via powder conveying devices, wherein the conveying devices from the mill drying facilities to each storage container are formed as a horizontal conveyor. Especially in fluidization channels, drag-link conveyors, screw conveyors, belt conveyors, pipe conveyors or pipe belt conveyors. It may be formed as.

In order to ensure continuous redundancy of the entire installation, according to another embodiment of the present invention, for each solid type, its own conveying device from the fuel reservoir to the distribution device is provided, and each solid type is provided. There is provided a dispensing device to silos of mill drying facilities, in which the conveying device and the dispensing device may each be designed with 100% redundancy for each solid type.

After all, according to the invention, the dispensing devices for live solids, into silos of the mill drying facilities, are connected with respective mill drying facilities, where each of the staying devices provided can have a different technical form and However, this is not very important here.

Other advantages, details and features of the present invention are shown with reference to the following description and drawings.

1 shows a plant according to the invention with one gasifier,
2 shows a facility with two gasifiers, in which the gasifiers are not shown separately;
3 shows a modified embodiment with two gasifiers.

1 shows an example of a gasification plant that can be affected by two different solids. The two solids shown by way of example can be, for example, fuel and additives required for thermal gasification. The need and type of additives depends on the nature of the fuel used. If it relates to a fuel that does not require additives during thermal conversion, it may be related to two fuels in the example of FIG. 1. In principle, a number of other fuels, and, if necessary, additives may be handled with this scheme.

Raw solids are provided from the fuel reservoir 1 to the dispensing apparatuses 4 and 5, respectively, via the conveying apparatuses 2 and 3, which dispensing a plurality of mill drapes (for example three in FIG. 3). Perform distribution to the rowing facility. The capacity of the most modern gasification methods is large, so fuel supply cannot be guaranteed with a single mill-drying facility alone. Even the largest mills currently commercially available are not sufficient to reliably feed gasifiers. This is because, on the one hand, the capacity of the grinding mill is insufficient, and on the other hand, the grinding mill has individual availability. In view of the possibility of failure expressed in the above availability, a certain over-capacity of the grinding mill must be provided in order to ensure control of the gasifier despite the failure of the grinding mill. Excessive capacity of the grinding mill can be achieved with, for example, a standby grinding mill which can be operated in case of failure. Alternatively, the overcapacity may be supplied through increased performance of the grinding mills in the operating state.

In the example of FIG. 1, three mill drying facilities 6a to 6c are provided to supply 100% fuel at any time to the gasification plant. After the two solids are housed in silos 7, 8 of the mill drying plant 6a-c, they are then ground together in a mill 9a-c, dried and crushed, A mixture made of solids (hereinafter referred to as dust) is conveyed out of the mill drying facility through each mill filter. In the case of the grinding mill 6a, which is spatially disposed closest to the gasification plant, the conveying 11 of the fuel powder is performed directly into the powder storage container 13. The other mills 6b and 6c give their powder to one powder conveying device 12 which is used jointly, which enables conveying into the storage container 13. 1 shows an exemplary example, i.e. for spatially different installations, the grinding mill 6a may also be used together with the powder conveying device 12 for supplying to the powder storage container 13. have.

According to the redundancy plan, the capacity of at least one grinding mill is additionally provided to ensure the fueling of the grinding mill in the event of a failure of one grinding mill, either through overcapacity of the remaining grinding mills or through an additional stand-by grinding mill. For safe fueling, redundancy in the conveying device, conveying device and dispensing device must also be provided-in order to be able to take advantage of the redundancy of the grinding lines. In this case, it relates to parts which guide the solids, and in some cases mechanically actuated, and therefore of course the parts are exposed to high loads and are therefore also prone to failure.

Therefore, the conveying device has 100% redundancy for each raw solid 2a, 3a, ie double (2b, 3b) is designed. Likewise, the dispensing device is designed with likewise 100% redundancy for the grinding mills 6a to 6c for each solid type 4a, 5a. Similarly, the powder conveying device 12a from the grinding mills to the powder storage container 13 is likewise designed double (12b). Fuel powder is taken from the powder storage container 13 via a corresponding sluice device 15 to the powder receiving container 16 at the required pressure, from which it continues to the burners 19 of the gasification reactor 18. Conveyance is guaranteed.

Similar to the method described in FIG. 1, it relates to two gasifiers in FIGS. 2 and 3, through which the gasifiers are arranged via an array of grinding mills (four grinding mills in FIG. 2, five in FIG. 3). Grinding mills) are supplied with powdered fuel. Each gasifier has its own powder storage containers 13a, 13b.

In FIG. 2, redundancy in the grinding lines is provided so that the failure of one grinding mill can be corrected through improving the performance of the other grinding mills, so that both gasifiers can continue to operate without performance loss. In the example of FIG. 2, two of the four grinding mills (6a, 6d) are arranged (11a, 11b) so that the grinding mills can direct the resulting powder directly into the powder storage containers 13a, 13b. It is. The powder conveying device 12a has a redundancy 12b and an intermediate grinding mill 6b so that it can be transported into the first storage container 13a to be able to supply fuel for both gasifiers in the event of failure of any one grinding mill. , 6c). At the same time, the two intermediate grinding mills 6b and 6c must be supplied to the powder storage container 13b through another powder conveying device 12c having redundancy 12d.

Example: In normal operation, all four mills operate, each supplying 25% of the total plant capacity (two gasifiers). At this time, the grinding mills 6a and 6b are supplied to the powder storage container 13a, and similarly 6c and 6d are supplied to the container 13b. Now, for example, if the grinding mill 6c fails, the performance of the remaining grinding mills is raised to 33%. The grinding mill 6b feeds half through the powder transport device 12 (a or b) to the powder storage container 13a, and the other half through the powder transport device 12 (c or d). It supplies to 13b.

Similar to the method described in FIG. 1, FIG. 3 relates to two gasifiers, which are fed with powdered fuel through an array of five grinding mills. Each gasifier has its own powder storage containers 13a, 13b.

In Fig. 3, redundancy in the grinding lines is provided so that the failure of one grinding mill can be corrected through the connection of the standby grinding mill, so that both gasifiers can continue to operate without a reduction in performance. In the example of FIG. 3, two of the four grinding mills 6a, 6e are arranged 11a, 11b to direct the resulting powder directly into the powder storage containers 13a, 13b. In order to be able to supply fuel for both gasifiers in the event of failure of any one grinding mill, the powder conveying device 12a has a redundancy 12b and is capable of being transported into the first storage container 13a. 6c) be connected to them. At the same time, the two grinding mills 6c and 6d must be supplied to the powder storage container 13b through another powder conveying device 12c having redundancy 12d.

Example: In normal operation, four of the five mills operate and each supply 25% of the total plant capacity (two gasifiers). At this time, the grinding mills 6a and 6b are supplied to the powder storage container 13a, and similarly 6d and 6e are supplied to the container 13b. The grinding mill 6c is in the standby mode. For example, when the grinding mill 6b breaks down, 6c is connected and conveyed into the powder storage container 13a via the powder conveying apparatus 12a, 12b. Similarly, failures of other grinding mills are corrected.

As transfer and distribution devices 2, 3, 4, 5, 12, in principle all types of mechanical, pneumatic, gravity driven steady-flow conveyors can be used. These include the following:

Mechanical steady flow conveyors with traction means, such as belt conveyors, including so-called link conveyors such as link belt conveyors, drag-link conveyors, scraper chains. conveyors, overhead trolley conveyors) or various types of bucket conveyors (bucket belt conveyors, chain and bucket conveyors, pivoted-bucket conveyors, etc.)

Mechanical steady flow conveyors having no towing means, such as roller conveyors, screw conveyors or vibrator conveyors

Gravity conveyors, such as chutes or downpipes

Pneumatic conveyors, such as dense flow or thin flow solid conveying, fluidized bed conveying or fluidizing channels.

Preferred implementations provide a fluidization channel for the powder conveying device 12 according to the invention. The fluidization channel offers the advantage of a small inclination of about 5 to 10 ° with respect to the horizon, whereby the transport of the powder from the plurality of mills to the powder storage container is mostly done horizontally, thus only a small loss in height You have to take it. For fluidization of the fuel powder and also for transportation, preferably already inert gas can be used. Another advantage is that the moving parts are completely omitted, which results in high serviceability and less chance of failure. The powder conveying may alternatively also be carried out with mechanical conveying devices, such as drag links or worms, but in that case the disadvantages of less availability must be taken into account.

For the raw, ie delivery (2, 3) and distribution (4, 5) of yet coarse solid particles, a mechanical steady flow conveyor, such as a belt conveyor, is provided.

1: solid reservoir / fuel reservoir 2a, b: conveying device
3a, b: conveying device 4a, b: dispensing device
5a, b: dispensing device 6a, ... e: mill drying facility
7a, ... e: silos 8a, ... e: silos
9a, ... e: Mill 10a, ... e: Mill Filter
11a, b: connection line 12a, ... d: powder conveying device
13a, b: powder storage container 14: sluice device
15: sluice container 16: powder container
17 gasifier 18 gasification reactor
19: burner system

Claims (12)

A method for providing uninterrupted supply of fuel to a gasification plant for generating biosynthetic gas, in which fuel is fed from a fuel reservoir to a mill drying facility via transfer means, and the resulting fuel powder is then stored in a fuel storage. A method for providing uninterrupted supply of fuel to a gasifier, which is supplied to a container, from there to a powder receiving container, and finally to a gasifier,
Powdered fuel from at least two mill drying facilities is supplied to the storage container via conveying means, at least one of said conveying means being acted upon by at least two mill drying facilities as a powder conveying device. A method for providing fuel to the facility without interruption. The method of claim 1,
Each of the storage containers connected upstream of each gasifier under the action of at least two mill drying facilities at the same time. The method according to claim 1 or 2,
One powder conveying device is assigned to another powder conveying device to form 100% redundancy, said powder conveying devices being simultaneously and / or separated so as to be operated by at least two mill drying facilities. A facility for providing uninterrupted supply of fuel to a gasification plant (17) for generating biosynthetic gas, in which the fuel is transferred to a fuel reservoir (1) or a fuel depot through transfer means (2, 4, 5 or 12). From the fuel drying container 6, which is then guided to the fuel storage container 13, from there to the powder receiving container 16, and finally to the gasifier 17. In a facility for providing uninterrupted supply of fuel to a gasification plant (17) for generating biosynthesis gas,
At least two mill drying facilities 6a, 6b and conveying means 11, 12 for supplying powdered fuel are assigned to the powder storage container 13, wherein at least one conveying means carries two flours. Gasification plant 17 for generating biosynthetic gas, which is formed by devices 12a and 12b, characterized in that the powder conveying devices are subjected to the action of at least two mill drying facilities 6b and 6c. Facility for supplying fuel without interruption. The method of claim 4, wherein
Each gasifier (17) is assigned a storage container (13), said storage container (13) being operated under the action of at least two mill drying plants (6a, 6b). The method according to claim 4 or 5,
Each powder conveying device 12 is formed by two powder conveying devices 12a, 12b acting together and / or separately to form 100% redundancy, each of which has two powder conveying devices. Facility characterized in that the mill drying facilities 6b, 6c are assigned. The method according to claim 6,
Wherein each mill drying plant (6) is assigned at least two solid feed silos (7, 8) and one mill (9) to feed and mix various fuels or additives. The method of claim 7, wherein
Has a plurality of gasifiers 17 with powder storage containers 13a, 13b assigned to each gasifier 17,
Each flour storage container (13a, 13b) is characterized in that it is connected to a plurality of grinding mills (6b, 6c) through the powder conveying devices (12a, 12b). The method of claim 8,
The conveying devices 12 from the mill drying facilities 6 to the respective storage containers 13 are formed as horizontal conveyors, in particular fluidization channels, drag link conveyors, screw conveyors, belt conveyors, pipe conveyors or pipe belt conveyors. A facility characterized in that it is formed as. The method according to any one of claims 4 to 8,
For each solid type, its own conveying devices 2a, 3a from the fuel reservoir 1 to the dispensing devices 4a, 5a are provided, and for each solid type of mill drying facilities 6 Facility characterized in that a distribution device (4a, 5a) to silos (7, 8) is provided. The method of claim 10,
Facility characterized in that the conveying devices (2a, 3a) and the dispensing devices (4a, 5a) are designed with 100% redundancy (2b, 3b and 4b, 5b) for each solid type, respectively. The method of claim 10 or 11,
Distributor (4a, 4b, 5a, 5b) for live solids, into silos (7, 8) of mill drying facilities (6), characterized in that connected to the respective mill drying facility.

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