Modeling NOx Emissions with an Intelligent Combinatorial Algorithm

Table 2

Process variables.

Variables	Unit	Variation range
Boiler load	WM	[700, 1000]
Total air flow	t/h	[2728, 3789]
Total coal flow	t/h	[260, 382]
Water coal ratio	%	[6.44, 7.81]
O2 content	%	[2.29, 5.54]
Feed water flow	t/h	[1923, 2713]
Feed water temperature	°C	[297, 317]
Exhaust gas temperature	°C	[119, 138]
Overfire air valve	%	[56, 183]
Additional air (A, B, C, D)	t/h	[45, 183]
Hot primary air valve opening (B, C, D, E, F)	%	[10, 99]
Cold primary air valve opening (B, C, D, E, F)	%	[0, 99]
Secondary air valve opening (AB, BC, CC, DD, DE, EF, FF)	%	[23, 82]
Outlet pressure of blower	kPa	[0.97, 2.91]
NOx emission in flue gases	mg/Nm^3	[113, 388]