Will steam purging damage the refractory wall before igniting the furnace?
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This post was last edited by Catalyzing a Grain on 2018-7-28 at 10:23. As the title suggests, will using steam for purging before lighting up the heating furnace damage the refractory walls? Square furnace. Isn’t it simple to just replace it directly using a blower and flue dampers?
The purge steam is dehydrated before being put into use, and it generally does not damage the refractory walls.
Forced-ventilation furnaces can be replaced with air circulation
Before starting the furnace, the fuel gas hoses and burner are usually disconnected, and they are connected only when it’s time to start the furnace. This eliminates the need for steam purging. However, if ignition fails, it is necessary to purge the furnace of any combustible gases to prevent flash explosions.
Generally not. The steam used for furnace purging needs to be free of condensate, and moreover, the steam valves should not be opened too wide or too quickly; the steam flow rate must be controlled； In normal design, the location where steam enters the furnace is also taken into consideration, right?
The purpose of steam purging is to displace the combustible gases inside the furnace, keeping them below the explosive range. The fast speed of purging allows these combustible gases to be driven away quickly. Before purging, any condensate is removed first; the steam merely moistens the surface of the refractory walls, having little impact on them. Blowing with air may generate static electricity at the air blowing outlet due to air flow, which can be dangerous; nitrogen can also be used for blowing, but the speed is slow, and it’s not as easy to determine when the process is complete as with steam.
Thank you for your explanation; I learned a lot from it
Here, before each ignition, we turn on the fan to ensure forced ventilation for a while; steam is not used for this purpose
Steam purging is used to achieve rapid displacement; when there is no urgency, forced ventilation can be employed, or the flue dampers and air vents can be opened in advance for natural ventilation.