Heating a gas can be accomplished using any of several heater types and/or a combination of types. Some heaters physically lend themselves to direct immersion in the gas stream, while others are better suited for heating a pipe or vessel containing the gas. The application descriptions below will give you a general idea on how a particular heater type is applied to heating gases and some common examples.
Sinuated or wound into coils and inserted into a pipe to heat flowing gases. Well suited to applications with restricted space requirements, and high temperature and watt density requirements.
Mounted through pipe or vessel walls with gases passing over heated section. Can be mounted in a protection tube for easier access/change-out. Well suited for high temperature and watt density requirements.
Used to construct chambers and furnaces to function as high temperature radiant heaters surrounding gas transfer pipes or other special vessels.
Applied to the surface of a pipe or vessel containing gases. Well suited for curved and irregular shaped objects. Well suited for applications with low to medium temperature and watt density requirements, distributed wattage requirements, or zoned heating requirements.
Multiple elements placed in a duct or vessel through which gases pass. Can also isolate gas from the element by externally heating pass tubes. Well suited for applications with high temperature/high pressure requirements,and zoned heating requirements.
Modified with fins to increase surface area for enhanced heat transfer.
Multiple elements mounted in an array and placed in a duct or vessel through which gases pass. Flat tubular elements can be modified with fins to increase surface area for enhanced heat transfer for duct heaters and circulation heaters with high volume requirements.