【Q&A Question 144】2016.09.11
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【Q&A Question 144】September 11, 2016: How to prevent backfire in heating furnaces? The answer key will be available after responding; scoring is based on answering the key points. 1. Enhance the liquid removal process in the fuel gas separation tank to prevent the fuel gas from containing light oil or water. 2. Maintain stable pressure in the fuel gas to avoid significant fluctuations in its pressure. 3. Ensure that there is sufficient air supply to the furnace, preventing secondary combustion at the top of the furnace which could create positive pressure and lead to backfire. 4. Set the flue dampers to an appropriate opening degree to maintain proper negative pressure and adequate suction.
Reasons for tempering: 1. Positive pressure operation in the furnace； 2. Low gas pressure ； 3. The gas pipeline is not equipped with a flame arrester ； 4. The damper adjustment is too large. Methods to prevent tempering: 1. Operate the furnace under positive pressure ； 2. Pay attention to gas pressure operation ； 3. Install flame arresters on gas pipelines ； 4. Adjust the damper scale reasonably
Low gas pressure, low air pressure, weak suction force; clean the burner during maintenance! Strengthen gas liquid separation!
1. It is strictly prohibited for gas to contain liquid; when this occurs, the dehydration process in the liquid separation tank must be intensified. 2. The flue dampers should be kept at an appropriate opening degree. 3. The negative pressure in the furnace chamber must be maintained within the normal range. 4. When starting the furnace or if ignition fails, it is necessary to purge it with steam for 10–15 minutes, and the gas composition in the furnace chamber must meet the required standards
It is strictly prohibited for gas to contain liquid; when this occurs, it is necessary to intensify the dehydration process in the liquid separation tank. The flue dampers should be kept at an appropriate opening to ensure that the negative pressure in the furnace remains within the normal range. When the furnace is ignited or ignition fails, it must be purged with steam for 10–15 minutes until the gas analysis in the furnace chamber is satisfactory.
It is strictly prohibited for gas to contain liquid; when this occurs, it is necessary to enhance the dehydration process in the liquid separation tank. The flue dampers should be set at an appropriate opening to maintain the furnace at a negative pressure within normal limits. When starting the furnace or if ignition fails, it is essential to purge it with steam for 10–15 minutes until the gas in the furnace meets the required standards. 1. Strengthen the dehydration process in the fuel gas liquid separation tank to prevent the fuel gas from containing light oil or water. 2. Maintain stable pressure in the fuel gas to avoid significant fluctuations. 3. Ensure that the furnace has sufficient air supply, thereby preventing secondary combustion at the top of the furnace, which could lead to positive pressure and backflow. 4. Set the flue dampers at an appropriate opening to ensure proper negative pressure and adequate suction.
Maintain proper negative pressure in the furnace; the fuel quality must be stable, and the gas must be free of oil. When watching the fire, look at it from the side.
Add quench towers and induced draft fans to the flue gas system
It is strictly prohibited for gas to contain liquid; when this occurs, it is necessary to intensify the dehydration process in the liquid separation tank. The flue dampers should be kept at an appropriate opening to ensure that the negative pressure in the furnace remains within the normal range.
It is strictly prohibited for gas to contain liquid; when this occurs, it is necessary to intensify the dehydration process in the liquid separation tank. The flue dampers should be kept at an appropriate opening to ensure that the negative pressure in the furnace remains within the normal range. When the furnace is ignited or ignition fails, it must be purged with steam for 10–15 minutes until the gas analysis in the furnace chamber is satisfactory.