Heating furnace is being dried; air valve under the constant-light lamp is leaking liquid
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Our factory uses liquefied gas, which is heated and vaporized by a steam coil before being used for furnace drying. The fuel gas pipeline has not been insulated; when the fuel gas reaches the metal hose under the pilot light, it is still in a vaporized state. After the pilot light is ignited by introducing a spark and the fuel gas valve is opened, it is difficult to light the pilot light, and once lit, it is hard to control and tends to go out easily. Liquid leaks occur at the air control valve at the bottom of the pilot light; since it is liquid gas, frost also forms there. What is the reason for this? Additionally: If liquefied gas is heated with steam to increase pressure, the leakage will be more severe
Mainly, the fuel gas composition is heavy; after vaporization, it remains in a saturated state. Additionally, the lack of heat tracing for insulation leads to the formation of liquid droplets. Therefore, the fuel gas not only needs to evaporate but also needs to be superheated, and the pipes must also be insulated with steam.
There are reasons for this, but when the metal hose of the permanent light is drained, few liquid droplets are produced. Additionally, when the heating pressure in the liquefied gas flash tank increases and the permanent light is lit again for adjustment, the issue of liquid droplets becomes more severe.
Today, the flame arrester was temporarily wrapped with rock wool along with the steam purge pipe; it’s not clear what the effect of that will be
After you turned off the eternal flame last time, there must have been gaseous liquefied gas in the pipes. Near the manual valve of the eternal flame, the pressure in the pipes increased, causing the liquefied gas in that area to turn into a liquid state; as a result, it was difficult to light the stove, or flames might burst out. I’m not sure if there is a vent line connected to the pipeline near the furnace where the constant-light device is located; by releasing the pressure inside, starting the furnace again should be fine.