Industrial Burner Types
Bloom Engineering manufactures a wide range of industrial burner and low NOx burners for industrial furnaces. This page identifies and explains the basic types of industrial burners with links to additional technical information.
Baffle Burners
Baffle burners recirculate furnace gas into the flame. Its appearance is deceptively simple consisting of a body, gas nozzle, baffle and port. Air enters the burner body directly and the gas passes through the body separated from the air with the fuel tube. The refractory baffle separates the body from the burner block (port), which is within the wall of the furnace. (<< More information on Bloom Baffle Burners)
High Thermal Release (HTR) Burners
Bloom HTR Burners are similar to the baffle burner. In the small size range, the HTR burner uses a metallic nozzle rather than a ceramic one. The air jets have a high radial velocity component which imparts a high spin to the air. The port block has a dished area. The combination of the high spin and the block configuration produces a flame with a flat profile. The burner is shown schematically in Figure 2.
The HTR Burner is inherently low NOx because large amounts of furnace gases are re-circulated into the flame area. Bloom has developed a lower NOx, version of the HTR with no loss of performance.
Regenerative Burners
An extremely important characteristic of all Bloom baffle and HTR burners their are low carbon monoxide production. Low NOx, versions of the baffle do not sacrifice low CO performance. This is the result of excellent mixing, flame stability and burning characteristics.
Regenerative burners present a particularly difficult NOx, reduction problem to the designers. Regenerative burners have excellent thermal efficiency because they achieve very high preheat temperatures leading to a high potential to emit NOx . (<< More information on Regenerative Burners)
Air Staged Burners
In the first stage of an air staged burner, all of the fuel is mixed with a portion of the combustion air. The remaining combustion air is then added in one or more additional stages until the fuel is completely used. Figure 1 shows a typical example of an air-staged low NOx, burner. The first stage air is introduced through the inner air jets and the second stage air through the outer air jets. Fuel flows through the center.
Air Staged Radiant Tube Burners
Air staged concepts have also been applied to radiant tube burners to reduce NOx Additionally, radiant tube burner NOx, performance can be improved significantly by adding exhaust gas to the combustion air. EGR and Radiant Tube Burners Bloom Engineering has developed radiant tube burner designs utilizing flue gas recirculation from the exhaust to the combustion air. (<< More information on Radiant Tube Burners)
The Type F burner (figure 3) uses an eductor in the recuperator's air discharge to draw POC from the exhaust into the combustion air, Impact on thermal efficiency is small. Tube temperature uniformity is improved.
