【Haichuan Discussion】What Should Be Noted Before Igniting a Heating Furnace (with a Summary of Related Accidents)
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The last edit to this post was made by Desert Fish on 2020-6-2 at 12:08. At 4:28 p.m. on May 30, the first eternal flame lit in Sinopec’s 10 million tons per year atmospheric and vacuum distillation unit was placed inside the heater, and the heater was successfully ignited. At 5 p.m., all 56 burners in the atmospheric pressure furnaces and reduced pressure furnaces were ignited, and the heating process began according to the furnace drying curve to raise the temperature and maintain it at a constant level
Question 1. How many permanent lights are usually installed in a heating furnace? ? ?
Our heating furnace has only one permanent light, but it has two burners
Look at the pictures on the first floor; just on this side alone, there are three of those kind of permanent light igniters
From the picture, the object that the worker is holding appears to be an everlasting lamp; the others are likely not such lamps, but rather modifications made for low-nitrogen combustion.
Those underground ones are probably from the heating furnace next to them
1. The gas line is subjected to an 8-hour steam purging and heat tightening process, followed by an 8-hour nitrogen purging to displace the steam, water, and air from within the pipeline. During nitrogen purging and displacement, a gas-tightness analysis was conducted to confirm the absence of leaks. The criterion for successful nitrogen purging is an oxygen content of no more than 0.5%. 2. After nitrogen displacement is successful, fuel gas is introduced for 4 hours of displacement. The criterion for a qualified replacement is an oxygen content of no more than 0.5% and a nitrogen content of no more than 30%. 3. Take the furnace explosion gas for sampling and analysis to ensure that the concentration of flammable gases is no more than 0.5%. 4. Once the analysis of the explosive gas shows it is satisfactory, it is necessary to contact the factory management and department staff to verify the situation on site and issue a fire permit. It should be noted that the ticket must be issued and ignition carried out within one hour after the relevant analysis is successful; otherwise, re-sampling for analysis will be required. Furthermore, unlike other fire tickets, the ticket for lighting a heating furnace must have the risk options for combustion and open flames checked. 5. The operators must wear the required personal protective equipment, use the kindling provided by the workshop to light the torches, and ignite the perpetual lamps. First, connect the flexible metal hose, open the gas valve to blow out any liquid accumulated inside the hose, and then attach the hose to the side of the heating furnace. Then a torch was lit, and it was inserted into the furnace to light the eternal flame. At this time, the burning condition of the eternal flame can be observed through the fire viewing window. 6. Finally, open the fuel gas valve of the burner and ignite it.
The ignition of heating furnaces poses a high risk and requires special attention; many accidents have occurred during the ignition process of such devices