A pulverized coal rich and thin burner with adjustable primary wind speed

Abstract

The invention provides a pulverized coal bias flame combustor with adjustable primary wind speed. The pulverized coal bias flame combustor is characterized in that a straight pipe is included, the two ends of the straight pipe are connected with a first bending pipe and a second bending pipe respectively, a primary wind channel is formed in the straight pipe, the first bending pipe and the second bending pipe, and a wind speed adjusting device is arranged in the straight pipe. The centrifugal force of a continuous bend is used for separation, the combustion mode of central dense flames and outer lean flames is achieved, the central dense-phase pulverized coal concentration is improved by about 25 percent, and outer-ring lean-phase pulverized coal concentration is reduced by about 25 percent. In addition, the pulverized coal concentration of a dense nozzle and a lean nozzle and the primary wind speed can be changed by adjusting a baffle, the adjustable range of the primary wind speed is approximately 20 percent of design wind speed, and therefore combustion of variable coal types and variable loads can be met. Therefore, compared with a traditional combustor, the pulverized coal bias flame combustor with the adjustable primary wind speed has the advantages of being strong in stability, good in coking prevention performance, high in combustion efficiency, low in NOX generation and the like.

Description

technical field [0001] The invention relates to a coal powder which is favorable for strong ignition stability, good anti-coking performance, high combustion efficiency, and NO X A low-generation burner belongs to the technical field of pulverized coal burners in thermal power plants. Background technique [0002] Pulverized coal thick and thin burners are widely used in coal-fired boilers in large thermal power plants. However, most of the pulverized coal thick-lean burners currently in use are horizontal thick-lean burners and vertical thick-lean burners, and central thick-lean burners are relatively rare. At present, once the construction and installation of the thick-lean burner is completed, the concentration of the thick-lean phase cannot be adjusted; even if it can be adjusted, it is a small fine-tuning. In short, the currently used thick-lean burners mainly have the following problems: (1) The primary wind speed of the pulverized coal thick-lean phase is poorly adj...

AI Technical Summary

Problems solved by technology

However, most of the pulverized coal thick-lean burners currently in use are horizontal thick-lean burners and vertical thick-lean burners, and the central thick-lean burner is relatively seldom used.

At present, once the construction and installation of the thick-lean burner is completed, the concentration of the thick-lean phase cannot be adjusted; even if it can be adjusted, it is a small fine-tuning

In short, the thick-lean burners currently in use mainly have the following problems: (1) The primary wind speed of the pulverized coal thick-lean phase is poorly adjustable, and the adjustment range is small; (2) The coal type is poorly adaptable

(3) Poor load adaptability

Generally speaking, the thermal load adjustment of power plant boilers is relatively frequent, and the primary air concentration varies greatly under different thermal loads, which is not good for combustion. Therefore, the thick-lean burner needs to adjust the primary air velocity and pulverized coal concentration according to different loads; (4) The structure is complex, Not easy to repair, not easy to replace

In the past, the adjustment mechanism of the thick-thin burner was mostly adjusted by the shutter mechanism, but after a long running time, it is prone to powder accumulation and then stuck.

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