Method of reducing coal ropes in a burner nozzle for pulverized coal
a technology of pulverized coal and burner nozzle, which is applied in the direction of burners, fuel supply regulation, combustion types, etc., can solve the problems of poor fuel distribution, poor flow distribution, and negative combustion effect, so as to achieve the effect of eliminating coal ropes and improving the flow distribution of the stream
Inactive Publication Date: 2012-06-14
POWER & INDAL SERVICES
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- Abstract
- Description
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Benefits of technology
"The present invention is a coal nozzle that includes an elongated tubular nozzle with an inlet and an outlet for discharging a flowing stream of coal / air mixture into a combustion zone of a furnace for combustion. The invention includes an elbow with a sawtooth or staircase surface configuration that breaks up coal ropes in the stream, improving flow distribution. The nozzle also includes a plurality of annularly arranged and axially aligned fins downstream of the elbow to further improve flow distribution. The staircase surface configuration is applied to the interior surface of a removable cover plate or in staircase segments to the respective interior flat segments of a removable back. The staircase surface configuration is made of a wear-resistant durable material such as steel or ceramic. The technical effects of the invention include improved flow distribution, reduced coal roping, and improved combustion efficiency."
Problems solved by technology
Problems incurred in burning pulverized coal often can be associated with coal roping in the fuel delivery system.
The dense areas of coal flow or coal ropes lead to poor flow distribution exiting the coal pipe and nozzle, which in turn has a negative effect on combustion.
Coal roping causes poor fuel distribution exiting the nozzle tip or outlet which results in flame variations.
With these wide variations at each burner of a multiple burner unit, unit control is difficult.
All of these references have attempted to disrupt the coal roping flow into and out of the stationary coal nozzles with limited success.
Method used
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[0026]Referring to FIG. 1, a basic stationary coal nozzle 10 of the prior art is illustrated and includes an elongated tubular nozzle 11 having an inlet 12 for receiving a flowing stream of coal / air mixture as indicated by the arrows, and an outlet 13 for discharging the flowing stream into a combustion zone of a furnace for combustion.
[0027]Also included is an inlet elbow 14 connected to the inlet 12 of tubular nozzle 11. The flowing stream of coal / air mixture is provided from an upright supply pipe 15 from a conventional source (not shown).
[0028]The elbow 14 illustrated here is a conventional flatback elbow with a removable flatback cover plate 16, which may be removed for wear replacement and clean out. The tubular nozzle 11 is generally lined with ceramic and may also include many types of deflectors or diffusers as previously described in the background. The elbow 14 and the cover plate 16 are generally constructed of cast and machined carbon steel.
[0029]As previously discussed...
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A coal nozzle for a burner on a pulverized coal fired furnace which includes an elongated tubular nozzle having an inlet for receiving a flowing stream of coal / air mixture and an outlet for discharging the flowing stream into a combustion zone of a furnace for combustion, and an inlet elbow connected to the inlet of the tubular nozzle. The interior outer surfaces of the elbow include a staircase surface configuration for engaging the incoming flowing stream whereby coal ropes in the stream are broken up for thereby improving flow distribution of the stream.
Description
CROSS REFERENCE[0001]This application is a division of U.S. application Ser. No. 12 / 322,468, filed 4 Feb. 2009.BACKGROUND OF THE INVENTION[0002]The present invention relates to a burner for pulverized coal and more particularly to a stationary coal nozzle for a burner on a pulverized coal fired furnace.[0003]A wide variety of burner designs have been developed over the years for burners used in furnaces, boilers and the like for burning pulverized coal. Problems incurred in burning pulverized coal often can be associated with coal roping in the fuel delivery system. Fuel roping is believed to be caused by centrifugal flow patterns established by elbows and pipe bends.[0004]Pulverized coal fired boilers have coal pipe networks which transport the coal from the pulverizers to the individual burners using air as the conveying medium. For the specific case of a wall fired boiler, the last turn in the coal / air mixture makes is a hard 90° turn in the burner. Coal roping is caused primaril...
Claims
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IPC IPC(8): F23D1/00
CPCF23D1/00F23D2201/30F23D2201/20
Inventor SHEKELL, LAWRENCE G.
Owner POWER & INDAL SERVICES