These heaters can have either helical coils or serpentine coils depending on your specific requirements and most suitable design solution to meet them.
Helical coils are self-draining with lower pressure drop, but they are limited by the number of flow passes and are more expensive to fabricate. Heaters of this type represent a low cost design which requires a minimum of plot area. Typical duties are 0.5 to 20 million Btu/h.
Serpentine coils are easier to maintain and less expensive to build. Here the tube coil is placed vertically along the walls of the combustion chamber. Heaters of this type also represent a low cost design which requires a minimum of plot area. Typical duties are 0.5 to 20 million Btu/h.
Box Type Heaters
These heaters can have vertical tube coils, horizontal tube coils or Arbor coils depending on your specific requirements and most suitable design solution to meet them.
In case of vertical tube double fired heaters, vertical radiant tubes are arranged in a single row in each combustion cell (there are often two cells) and are fired from both sides of the row. Such an arrangement yields a highly uniform distribution of heat-transfer rates about the tube circumference.
Another variation of these heaters uses multilevel side-wall firing, which gives maximum control of the heat-flux profile along the length of the tubes. Multi-level side-wall firing units are often employed in fired-reactor services and in critical reactor-feed heating services. In addition to the twin-cell furnaces, single cell models are available for smaller duties. As a group, these represent the most expensive fired heater configuration. The typical duty range for each cell runs from about 20 to 125 million Btu/h.
The BORN “Pre-fab” heater is a tough, versatile unit that is shipped in completely assembled modules. It is available either with horizontal tubes or vertical tubes.
The prefabricated and preassembled heater was developed in response to a demand for a process heater which could be shipped as a single entity or in modules or sections ready for field assembly.
Units are available in sizes ranging from 200,000 BTU/hr to 500,000,000 BTU/hr.
The unique feature of the Born “Prefab” heater is that it arrives at the job-site as completely preassembled units. This feature reduces field construction costs to the absolute minimum while at the same time giving quality process heater operation and efficiency.