Experimental Study on Combustion Optimization for Ultra Low NOx Emissions in 2 028 t/h Sub-Critical Boilers Firing Shenhua-Coal

doi:10.11930/j.issn.1004-9649.2014.12.7.5

Abstract

Abstract: In order to figure out the mechanism of ultra-low NO_x combustion in deep staged air in the boilers firing Shenhua coal and achieve the integrative goals of anti slagging, high efficiency combustion and ultra-low NO_x emission, the directional adjustment test based on the multi-objective optimization technique is conducted. Through the optimization on the air distribution of the coal pulverizing system and auxiliary air system, the thermal efficiency is improved from 94% to 94.14%, the NO_x emissions at the entrance of SCR is reduced from 129 to 108.3 mg/m³, and the CO concentration of air pre-heater inlet also drops from 338 to 50 ppm with the unburned carbon contents both in fly ash and slag significantly decreased. The soot-blowing also is reduced from 3 times to 1 time one day, and the furnace cleanliness is enhanced significantly.

Key words: boiler, deep air staged combustion, ultra-low NOx emission, pulverized coal fineness

CLC Number:

TK223.21

HUANG Jun. Experimental Study on Combustion Optimization for Ultra Low NO_x Emissions in 2 028 t/h Sub-Critical Boilers Firing Shenhua-Coal[J]. Electric Power, 2014, 47(12): 7-12.

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Experimental Study on Combustion Optimization for Ultra Low NO_x Emissions in 2 028 t/h Sub-Critical Boilers Firing Shenhua-Coal

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