A Boiler Overfire Air Adjustment Method Based on Momentum

Abstract

The invention relates to a method for adjusting boiler burn-out air based on dynamic moment. The technical solution is to sum the momentum moments of burners with opposite rotation directions in the main combustion zone to obtain the anti-tangential wind momentum moment; and rotate the main combustion zones to the same combustion The sum of the momentum moment of the burner is the tangential wind momentum moment; the sum of the antitangential wind momentum moment and the sum of the tangential wind momentum moment are compared, and the inverse tangential angle of the overburning air is adjusted through the overburning air adjustment mechanism until the ratio is between 0.8 and 1.2 During the period, the present invention realizes the hot state adjustment effect through the cold state test, simplifies the work flow and workload, and greatly improves the working efficiency. Make the flue gas in the horizontal flue of the boiler evenly distributed, finally the ash accumulation in the horizontal flue is uniform, and the ash fall has no effect on the boiler disturbance, the negative pressure no longer fluctuates greatly, and the deviation of the flue gas and steam temperature in the horizontal flue is reduced , Improve the safe operation of the boiler.

Description

technical field [0001] The invention relates to a method for adjusting boiler overfire air based on momentum moment. Background technique [0002] Coal-fired generator sets are the main force of electric power now. Four-corner tangential combustion boilers have been widely used in coal-fired generator sets. The primary and secondary co-rotating combustions are used, and a few layers of reverse paranoid winds are arranged in the main combustion area to reduce the coking of the furnace in the main combustion area, but the rotation direction of the main combustion area cannot be changed. The overburning air is arranged on the upper part of the furnace. The overburning air has the function of swinging left and right. It can be adjusted through the left and right adjustment mechanism of the overburning air. The adjustment mechanism has an adjustment angle display to eliminate the residual rotation of the boiler circle. In the actual operation of the boiler, in order to reduce NO...

AI Technical Summary

Problems solved by technology

[0003] There is no theoretical calculation basis for the adjustment of the existing overburning air, and most of them are adjusted on site during the unit operation stage. Due to the large number of overburning air layers, 300MW level boilers are arranged with about 3 layers of overburning air nozzles, and 600MW level boilers are arranged with about 6 layers of overburning air outlets. Air nozzles, 1000MW level boilers are arranged with about 8 layers of burn-out air nozzles, the adjustment is complicated and takes a long time, and in the hot state, the burn-out air burners often jam due to thermal expansion and cannot be adjusted

Seriously affect the safe and stable operation of the boiler

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