DD214910A1 - METHOD FOR CARBOX PRODUCTION FOR STEAM GENERATORS AND IGNITIONS - Google Patents

Abstract

The invention relates to a method for producing dusty goods, especially coal dust, in Muehlen with its own and foreign ventilation effect. The invention has for its object to simplify the intermediate separation system, therefore to minimize the technical equipment and the associated expenses and to avoid the known from the closed system adverse effects of condensation formation by removal of a partial flow. According to the invention, the object is achieved in that the dust generated in a mill with its own or foreign ventilation effect largely separated from the carrier gas in a simple yet powerful separation system and laden with residual dust Traggasstrom is returned to Muehle, with a partial amount of gas before entering the mill for a separate use is diverted.

Description

Title of the invention

Process for coal dust production for steam generators and furnaces

Field of application of the invention

The invention relates to a method for producing dusty, shaped goods, especially coal dust, in.Mühlen with own and foreign Yentilationswirkung. This method can be used for steam generators and furnaces and in particular for the conversion 'so far heiz.ölgef euerter steam generator suitable.

Characteristic of the known technical solution

It is known that coal dust from unbroken or rorzerkleinerter brown or hard coal by payment z. B. in racket or fan mills is generated. These mills are found in the firing technology of almost all sectors of the economy, especially in the coal and energy industries. These feelings will be

, ν usually as part of the pusher system directly with yours. Steam generator coupled so that hot puffed gas sucked through the mills from the steam generator and in the mill for drying and grinding (grinding drying). and then the resulting pulverized coal gas is injected directly through a burner into the combustion chamber of the steam generator.'The grinding process is used for the treatment of moist fuels.

It is also known that the pulverized coal produced can be conducted to a Z-wischenabscheidung, wherein the loaded with residual dust exhaust gases are introduced back into the steam generator. Depending on the type of mill, the generated dust can either through. Yentilatlonswirkurig the mills, or be discharged by gate and downstream fans with the gas flow from the mill.

When grinding dry or, with residual moisture, fuel e, BV- B. briquette, briquette. abrasion and dry brown coal, the mills are operated with cooled inert gas or air. In this case, the Breanstaub generated can be transported either directly or indirectly via intermediate deposition to the burner »The indirect driving style, which is also referred to as driving with open Mahlsystera requires a very high purification of the exhaust gases to be able to release it to the atmosphere. Their disadvantage is that. a high apparatus, energetic, operational organizational and therefore cost-consuming effort is required. to meet the air hygiene requirements. Despite this effort can not be completely avoided that residual dust enters the atmosphere.

There has been no lack of attempts in the past to avoid the abovementioned disadvantages in the milling of dry fuels. By moving the inert gas in a closed circuit.

By the grinding process and the promotion in a closed cycle, it inevitably comes to a temperature increase of the carrier gas. With existing residual moisture

and the large surface of the milled material evaporative processes are effective, which can go up to a saturation of the supporting gas according to the temperature increase. The thereby an.den cold. Dew point undershoots occurring on the wall surfaces of the grinding system lead to the formation of water pools, as a result of which yerking and additions as well as corrosion of the election system occur, which ultimately leads to malfunctions. In addition, the regrind can partially absorb condensation again, thereby agglomerate and be unsuitable for further processing.

Aim of the invention;

The aim of the invention "is to reduce the high economic costs of the open grinding systems for dry fuels, and to exclude" the malfunctioning closed system pacts.

Explanation of the essence of the invention

The invention has for its object to simplify the intermediate separation system, therefore to minimize the technical equipment and the associated expenses and to avoid the known from the closed system adverse effects of condensation by discharging a partial flow

 According to the invention, this object is achieved in that the dust produced in a mill "with its own, or external ventilation effect in a simple and

nevertheless efficient separation system largely rom carrier gas separated and laden with Reststäub Traggasstrotn to the mill -back, with a partial amount of gas is diverted before entering the mill for a separate.Use Purpose. At the same time an equivalent Traggasraenge is reintroduced in the grinding cycle in or at the mill, so that the carrier gas volume passed through the mill remains constant. The residual dust content of the carrier gas does not disturb the milling process, since it is of the order of magnitude of <15 % . By introducing the fresh gas is avoided that increases the temperature of the circuit and occur evaporation processes on the ground material with residual moisture. The branched loaded with residual dust Teilgasstrorn can either be sucked by a fan or carried away by the ventilation effect of the mill. The discharged partial gas quantity can be sent to one or more points of use.

10.5 leads. In the most favorable case, the volume of the partial gas flow may correspond to the gas flow rate of the grinding system, whereby a modified type of operation with open grinding system is achieved without the disadvantages described occurring , Main fields of application for the discharged partial gas quantity are z. As combustion and gasification facilities, blast furnaces and possibly existing dedusting systems of other technological equipment.

Ausführim.gsbeispiel

The invention is the embodiment of a processing system for Brikettabrieb, Brikettabfall or

Tr ο eke nb raunkohle explains. The fuel, with a coronation of 20/0 mm, passes through the feeder 1 into a pulverized coal dust mill 2 with separator, the pulverized dust is produced in the mill and the generated dust is removed from the mill 2 by air and via the riser 3 to the separator 4 supplied.

In separator 4 80 ... 90 ° h of coal dust. separated and led out via the rotary valve 5 from the system. At the branching point 7, a part of the circulating air is sucked through the fans 8 and fed via pipes 9 to the steam generators 10 as combustion air. The remaining circulating air is sucked through the mill 2. The fresh air volume equivalent to the branched circulating air is introduced into the mill 2 via the intake 11 (or other openings). The coal dust discharged through the rotary valve 5 from the separator 4 passes via the metering bunker 12 and the rotary valves 13 into the pipes 9 and then into the steam generator 10 for combustion.

Claims (1)

Λ. ··· ··!. 9 years Erf indan spruoh Process for pulverized coal production for steam generators and furnaces, in particular for dry or mature wet-laden fuel, characterized in that the dust generated in a mill with its own and / or external ventilation effect is largely separated from the gas bearing gas in a simple and efficient separator and laden with residual dust Traggasstrom to the mill: is recycled, with a Teilgasinenge vor-. Entrance, is diverted to the mill for a separate use. , Method according to item 1, characterized in that the branched, loaded with residual dust partial gas stream either sucked by a fan or is requested by the ventilation effect of the mill. A method according to item 1, characterized in that the discharged partial gas quantity is conducted either to one or more points of use, these maximum depending on the recording conditions of the separate points of use. • times the gas flow rate of the mill can correspond ..