chapter  17
18 Pages

- R

Reburn is a process where NOx is reduced by reaction with HC fuel fragments as illustrated in Figure 17.1 for a frontwall-fired boiler.

In some cases, LNBs alone may not be able to achieve the NOx emissions to the desired levels in a boiler mainly due to

• The non-availability of LNBs (such as in cyclone firing)

• The performance problems with LNBs (such as in C loss or tubewall wastage) or

• Insufficient NOx reduction

Reburn can be applied to any unit firing any fuel to achieve NOx reductions, typically in the range of 50%–70%. Moreover, it can be integrated with N2-agent injection and other technologies for even greater NOx reduction.