Adjustable thermal profile burners

Using many small burners to utilize the whole wall area is a way to achieve good temperature uniformity. (See figs. 3.4 and 3.5, and sec. 7.4.) There are large burners that can hold the burner wall as hot as the point of conventional maximum heat release. These adjustable thermal profile burners (fig. 6.1) can automatically hold a desired temperature profile by controlling the spin of the products of combustion. Optimum use of furnace space and overall refractory wall radiation usually favors the hottest possible burner wall (maximum flame spin, minimum flame length). In... 

Use adjustable thermal profile burners above the load on one side of the furnace. Control these burners by two temperature sensors, each at the level of the top of the load—one in the burner wall and one opposite. Bring the two temperatures up as one by controlling the spin of the air through the burner. Follow the fuel input until minimum fuel input is registered in all zones. Add 1 hr for thin loads and 2 hr for thick loads, then draw the first piece. 

Fig. 3.26. Batch fu rnace for good uniformity control, with top backwall fired by adjustable thermal profile burners and bottoms of sidewalls fired by hlgh-velodty burners multiple T-sensors on both sides. Flow lines show the sweeps of gases of the ATP burners spinning short mode flames, medium length flames, and long mode flames. (See also figs. 2.21,6.1, and 6.23.)...

An alternative to adjustable thermal profile burners above the loads for topside crosswise temperature uniformity might be staggered opposed regenerative burners because the alternate firing from right then left would help develop level temperature patterns, as is done with regenerative burners on both ends of a long radiant... 

Circulation by the burner gases helps convection, raises triatomic gas concentration (for more gas radiation to all sides of the tubes), and lowers NOx emissions. With large burners, use of adjustable thermal profile burners can optimize uniform heating to the coils. 

Q8. Why are adjustable thermal profile burners generally more efficient in continuous longitudinally fired reheat furnaces ... 

A8. For maximum heat transfer at minimum fuel cost, short flame burners are ideal. However, if higher production with reasonable efficiency is needed, flame lengthening is often necessary. This change can be made manually or automatically with adjustable thermal profile burners. Most other burners cannot be adjusted without part changes. 

ATP burners = adjustable thermal profile burners, manually or automatically adjustable to change the heat release pattern of the combustion reaction. See section 2.6.)... 

Otto must be smiling now, with the development of adjustable thermal profile flames and of 20-sec-on and 20-sec-off regenerative burner flames, both of which fulfill his dream as well as Prof. Trinks and Matt Mawhinney s idea of alternating flame patterns (with respect to time) for better overall ttansfer. 

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