DD207568A1 - METHOD FOR COMPLETELY COMBUSTION OF RAW COAL - Google Patents

Abstract

Process for the complete combustion of raw coal with a Mahldrocknung in Muehlen under the combustion chamber, the raw coal pre-crushed the combustion chamber is metered by a meter at a certain height of the combustion chamber. During flight through the combustion chamber, the raw coal is dried and fed to a partial combustion. The advantage of the method lies in the reduction of the material to be ground and in the complete utilization of the introduced raw coal. For strongly ash-containing coals, ash removal facilities serve to reduce the ash circulation before the mill. The process is used in steam generators with pulverized coal firing.

Description

Title of the invention

Process for the complete combustion of raw coal

Field of application of the invention

The field of application of the invention comprises a process for the complete combustion of raw coal in pulverized coal fired steam generators.

Characteristic of the known technical solutions

Known are methods and devices for complete combustion of raw coal, which differ in processes and devices with a lying outside the combustion chamber channel for flue gas Rücksaugung and coal pre-drying, crushing drying in a Einblasefflühle and the residual combustion by a combustion grate at the bottom of the combustion chamber, resulting in the use of two different Techniques and methods and devices without Rauchgassugaugekanal, which is a known classic firing method and is not suitable for high performance.

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According to DD-WP 61076 a method for the complete combustion of xylithaltigen coals in pulverized coal combustion in steam generators is known, which exposes the blown with still insufficient, shredded Sylite the temperature action of the flame and the resulting degassing residues at the bottom of the combustion chamber to a separate mill that grinds them and inject again ..

disadvantageous is the necessary separate mill, which forces to separate channels as connections between the mill and burner. Furthermore, the loading of this separate mill, discontinuous, since the xylitol is not present in the homogeneous homogeneous coal and this mill temporarily circulates flue gas. The discontinuous conveyance of xylitol leads to difficult operating conditions in the combustor, which necessitates an increased expense in terms of scale.

Object of the invention . '"'"

The invention has for its object to realize an economic way complete combustion of the raw coal, with a Rauchgasrücksaugekanal is not necessary and the loss is reduced by unburned to an insignificant size.

Explanation of the essence of the invention

The object is achieved in that according to the invention a known ^ allocation device of a combustion chamber directly gives up the pre-crushed raw coal at a certain height, this in the free Pail and / or another Plugbahn to

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Brennkammerboden falls .und thereby undergoes a pre-drying and / or Teilverbrennungs- and / or combustion process. The bottom of the combustion chamber, through its training

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As a baffle plate the impact of the coal parts and has a known distribution device that forwards the incoming flow of material from the bottom of the combustion chamber through channels. The distributor device according to the invention is designed so that, when decommissioning one and / or more mills, the closure of the channel is ensured. The channel leads the crushed, pre-dried coal together with hot flue gas to a known mill, in which a shred drying, which follows a known separator and performs a screening of the ground coal. The crushed and dried coal flows after the classifier through the fuel dust channel to the known burner, which gives up the fuel dust with the gas flow of the combustion chamber. In the combustion chamber, the combustion takes place, through one or more channels, the mills, the number of which is selected according to the requirements, with the fuel flow, which is reduced by the already burned and / or discharged subsets acted upon. By combustion of fine coal fractions and the pre-drying process in the trajectory to the combustion chamber bottom, the amount of raw coal is reduced, which is further enhanced by the impact comminution.

The formation of the distribution device according to the invention prevents: the deposition of coal on the feed part of a mill, which is not in operation due to requirements.

The advantage of the invention lies in the complete workup of the combustion ash, the existing Xylitrückstände and the filling of the Brennerkammertrichters with the flame, Furthermore, the Mahlaufwand is reduced by the done in the combustion chamber combustion of fine coal fractions and the Flugstaubaustrag by the flue gas from the combustion chamber.

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embodiment

The 'invention is to follow an Ausführungsbeispie! be explained in more detail. In the accompanying drawing shows

Pig. 1: the coal dust firing with opening into the combustion chamber "connection channel

The pre-crushed raw coal is abandoned by the allocator 1 of the combustion chamber 2. The raw coal undergoes predrying in the course of the plug web to the bottom 3. Through the distributor device 4, which allows the beating of the coal as a baffle plate, the solids which have reached the bottom are fed together with the hot flue gas through the channel 5 to the suction side of the mill 7. Depending on the requirements, one or more mills are used. In the channel 5, an ash deposit 6 is provided. After the mill 7, the classifier 8 views the ground raw coal and ash particles »In the mill 7, a comminution-drying of the raw coal pre-dried in the combustion chamber takes place. Through the Brennstaubkanal 9 of the fuel dust ash and flue gas stream is supplied to the burner 10, which gives up the total flow of the combustion chamber 2 for combustion.

The ash separation 6 serves to reduce the ash circulation in strongly ash-containing raw coal.

Claims (4)

claim ♦ A process for the complete combustion of raw coal, characterized in that the combustion chamber is used directly for the predrying of the treated raw coal produced by a distributor of the. Combustion chamber is used, is used, in which the raw coal falls from the arbiter by free fall and / or another plug track to the ground, it is .The temperature exposure of the flame is exposed and by a distribution device that allows the beating of the raw coal baffle, a feeder ensured to a mill through the channel together with the hot flue gas, thereby realizing a shredder drying in the mill, then a sifter performs a sighting and the dust-gas mixture passes through a Brennstaubkanal a burner that supplies the combustion chamber, the flow of material for combustion. 2i method make item 1, characterized in that also combustion residues and / or unburned pass through the distributor device to the mill, crushed and returned to the combustion chamber. 3 * Method according to points T and 2, characterized in that .the distributor device in the case of several mills, ensure the decommissioning of one or more mills without adversely affecting the combustion chamber bottom due to ash accumulation. 4 * Method according to items 1 to 3, characterized in that ash separation can be used in the channel from the bottom to the suction side of the mill. Method according to item 1 to 4, characterized in that the drop height between the feeder and the ground allows predrying. For this 1 Selta drawings'