Seeking help with the issue of flue gas returning from household waste boilers
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I am seeking a professional in the static equipment industry for long-term cooperation, and I have encountered some problems now. I use a furnace whose normal operating temperature is around 200 degrees; during a single operation, when the temperature reaches over 400 degrees, smoke starts to leak out from the furnace door under negative pressure in the downstream system, and in some cases there is even spraying of gas or flames. I am urgently seeking experts willing to work with me on a fee-based basis, preferably professionals in the fields of boiler, pressure vessel, and pipeline design. Discuss the specific parameters via private message.
There is a problem with your ventilation system.
This post was last edited by Simply put_myP89 on 2021-7-20 at 11:20. There are many experts in this forum; let’s discuss first. Are there any photos from the site? There are many reasons for smoke return: insufficient air supply or exhaust, low placement of chimneys leading to inadequate natural ventilation, excessive accumulation of scale inside the furnace, mismatched desulfurization and denitrification equipment, insufficient diameter of flues, and so on. The causes are diverse and multiple. What does furnace temperature refer to? Temperature at the flue outlet at the furnace tail? Or check the data on smoke resistance calculation in the random files, and measure the pressure difference.
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There’s no need for personal contact; posting on the forum on-site is sufficient. Let’s discuss it together.
As the temperature rises, the flue gas cannot be discharged in time, resulting in backflow of smoke and flashback
The positive pressure is rising too fast; there’s no time to extract it
Based on the situation you described, it is likely that there is local scaling and blockage in the furnace outlet pipeline, or that the refractory material has peeled off, which is affecting the ventilation volume； Second, the composition of your material has changed; there is an excessive amount of moisture or a high level of organic substances, which causes gas expansion and results in positive pressure in the furnace.
Your burned materials need to have a composition table in order to determine which substances cannot decompose and burn at 400 degrees. Under normal conditions, it’s only 200 degrees; many organic substances cannot be decomposed and burned properly at such temperatures