A High –Efficiency , Low-NOx Burner for Oxy-Gas Glass Furnaces

摘要

Switching from air-gas to oxy-gas combustion inglass furnaces offers the advantages of reduced energycosts ,lower NOx and particulate emissions ,and decreasedcapital and maintenance costs by eliminating flue gas cleaningand heat recovery regenerators .Oxygas flames burn at highertemperatures ,providing energy savings through more efficientradiant heat transfer and higher enrgy availability .Low NOxlevels result from the reduced amount of nitrogen in theflame .At high oxy-gas flame temperatures ,the combustionproducts are not luminous (low emissivity ),which limits processefficiency and production rate and results in higher-than-necessary fuel and oxygen consumption .The Institute of GasTechnology (IGT) and Combustion Tec ,Inc .,(CTI) havecompleted laboratory testing of 0.5 MMBtu/h versions of ahigh-luminosity ,low- NOx oxy-gas burner and are preparing a3MMBtu/h version for testing .This IGT-patented burnerproduces a highly luminous flame by forming and then burningsoot in the flame .Tests show an increase in heat transfer to theload of more than 12% ,a significant decrease in NOx emissionscompared with other oxy-gas burners ,a flame shape with largercoverage of the load ,and a reduction in exhaust gastemperatures by more than 100°F compared with commerciallow- NOx oxy-gas burners .Even greater increases in heattransfer and reductions in NOx are expected in the firstcommercial demonstration next year.