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US 8,573,965 B2Granted
Method of operating a pyrolysis heater for reduced NOx
AssigneeAir Products and Chemicals, Inc.
InventorsReed Jacob Hendershot, Xianming Jimmy Li, Aleksandar Georgi Slavejkov
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Abstract
A method of operating a pyrolysis heater for reduced emissions of NOx and carbon monoxide. One or more wall burners, typically premix burners, are operated with more excess oxidant gas than one or more of the floor or hearth burners, which are typically non-premix burners. The invention takes advantage of different NOx emissions characteristics from different types of burners.
Claims9
A method of operating a pyrolysis heater comprising:
- introducing a first fuel and a first oxidant gas into the pyrolysis heater through a first wall burner positioned in a row of wall burners, wherein the first wall burner is a premix burner, the first wall burner having a first equivalence ratio, φ1;
- and
- introducing at least one of the first fuel and a second fuel and at least one of the first oxidant gas and a second oxidant gas into the pyrolysis heater through a first floor burner positioned in a row of floor burners, wherein the first floor burner is a non-premix burner, the first floor burner having a second equivalence ratio, φ2;
- wherein φ1<0.91<φ2 ≦1.0. and φ1<0.95×φ2.
1 more element
Dependencies are inferred from the claim text.