On-line coal powder pipeline wind-powder leveling method

Abstract

The invention discloses an on-line coal powder pipeline wind-powder leveling method for monitoring two parameters including the concentration and the flow speed of coal powder, and the leveling of primary wind speed and coal powder concentration adopts a comprehensive regulating scheme according to the monitored result. The regulating sequence is that the gradual leveling is carried out on the primary wind speed firstly, and on the basis, the coal powder concentration leveling is carried out. The on-line wind-powder leveling of the coal powder pipeline is the comprehensive leveling by using the combination of cod state and hot state environments of a machine set, and the great deviation caused by the leveling through the unitary cold state is remedied; the regulation of the primary wind speed is realized through adjustable contracted holes, and on the basis of monitored data, the contracted holes are regulated step by step by gradually reducing the aperture from 100% until the primary wind speed is balanced; and after the primary wind speed is leveled, the coal powder concentration is leveled through a coal powder pipe balanced valve. According to the method, the wind-powder distribution balancing property can be optimized effectively, the secondary wind optimization configuration can be matched, the boiler efficiency is improved, and the emission of NOx is lowered.

Description

technical field [0001] The invention belongs to the technical field of boiler combustion optimization and adjustment, and is based on the precise measurement of the pulverized coal concentration and the primary wind speed of the pulverized coal pipe, and the adjustment of the adjustable shrinkage cavity and the pulverized coal flow balance valve system to adjust the air powder balance of the pulverized coal pipeline. , to optimize the air-to-coal ratio. Background technique [0002] The direct-blown pulverization system commonly used in modern large-capacity units, the distribution of wind speed in the pulverized coal pipeline corresponding to each burner, the distribution and balance of pulverized coal flow are of great importance to the safety, economy and environmental protection of the combustion in the furnace. important influence. [0003] However, at present, the monitoring and measuring points of the large-capacity direct-blowing pulverization system are only limite...

AI Technical Summary

Problems solved by technology

In this way, the concentration distribution of pulverized coal entering the burner will be very uneven, which will adversely affect the flame stability and combustion distribution.

[0008] 2. The measurement of pulverized coal pipeline lacks advanced online measurement means

[0012] 3. Lack of leveling means for pulverized coal pipelines

However, such an adjustment goal requires necessary adjustment means, which is difficult to achieve in terms of the current equipment status

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