[Q&A Question 207] 2016.11.13
Thread Content
【Q&A Question 207】November 13, 2016: What are the factors that affect the thermal efficiency of a heating furnace? The answer key will be available after responding; scoring is based on answering the key points. 1. The higher the flue gas temperature in the furnace, the lower the thermal efficiency. 2. The larger the excess air coefficient, the lower the thermal efficiency. 3. The greater the losses due to incomplete chemical combustion – that is, the more CO and hydrogen in the flue gases – the lower the thermal efficiency. 4. The greater the losses due to incomplete mechanical combustion, meaning a higher content of unburned carbon particles, the lower the thermal efficiency. 5. The greater the heat loss through the furnace walls, the lower the thermal efficiency. 2016 Q&A Summary Post (updated as of November~~~~) Seeking sponsors for the “2016 HaiChuan Top 10 Members Selection Contest” http://bbs.hcbbs.com/thread-1628108-1-1.html (Source: HaiChuan Chemical Forum)
(1) The higher the flue gas temperature of the furnace, the lower its thermal efficiency. (2) The higher the excess air coefficient, the lower the thermal efficiency. (3) The greater the loss due to incomplete chemical combustion, that is, the more CO and H2 in the exhaust gases, the lower the thermal efficiency. (4) The greater the mechanical incomplete combustion loss, that is, the higher the content of unburned carbon particles in the exhaust gases, the lower the thermal efficiency. (5) The greater the heat loss from the furnace wall, the lower the thermal efficiency.
1. The higher the flue gas temperature in the furnace, the lower the thermal efficiency. 2. The larger the excess air coefficient, the lower the thermal efficiency. 3. The greater the losses due to incomplete chemical combustion – that is, the more CO and hydrogen in the flue gases – the lower the thermal efficiency. 4. The greater the losses due to incomplete mechanical combustion, meaning a higher content of unburned carbon particles, the lower the thermal efficiency. 5. The greater the heat loss through the furnace walls, the lower the thermal efficiency.
1 The higher the flue gas temperature of a furnace, the lower its thermal efficiency. 2 The higher the excess air coefficient, the lower the thermal efficiency. 3 The greater the loss due to incomplete chemical combustion, that is, the more CO and hydrogen in the exhaust gases, the lower the thermal efficiency. 4 The greater the loss due to incomplete mechanical combustion, that is, the higher the content of unburned carbon particles in the exhaust gases, the lower the thermal efficiency. 5 The greater the heat loss from the furnace wall, the lower the thermal efficiency
1. Fuel type； 2. Excess air coefficient ； 3. Furnace negative pressure level ； 4. Smoke exhaust temperature ； 5. Heat loss through the furnace wall
1. Flue gas temperature 2. Control of oxygen content in the furnace chamber 3. Heat transfer efficiency of the furnace tubes and coking conditions
(1) The higher the flue gas temperature of the furnace, the lower its thermal efficiency. (2) The higher the excess air coefficient, the lower the thermal efficiency. (3) The greater the loss due to incomplete chemical combustion, that is, the more CO and H2 in the exhaust gases, the lower the thermal efficiency. (4) The greater the mechanical incomplete combustion loss, that is, the higher the content of unburned carbon particles in the exhaust gases, the lower the thermal efficiency. (5) The greater the heat loss from the furnace wall, the lower the thermal efficiency
1. High excess air coefficient. 2. Dust accumulation or structural issues in the convection section heat exchanger, resulting in high flue gas temperature. 3. Incomplete combustion. 4. Heat loss through the furnace walls. 5. Low temperature of the process medium entering the furnace
(1) The higher the flue gas temperature of the furnace, the lower its thermal efficiency. (2) The higher the excess air coefficient, the lower the thermal efficiency. (3) The greater the loss due to incomplete chemical combustion, that is, the more CO and H2 in the exhaust gases, the lower the thermal efficiency. (4) The greater the mechanical incomplete combustion loss, that is, the higher the content of unburned carbon particles in the exhaust gases, the lower the thermal efficiency. (5) The greater the heat loss from the furnace wall, the lower the thermal efficiency.
(1) The higher the flue gas temperature of the furnace, the lower its thermal efficiency. (2) The higher the excess air coefficient, the lower the thermal efficiency. (3) The greater the loss due to incomplete chemical combustion, that is, the more CO and H2 in the exhaust gases, the lower the thermal efficiency. (4) The greater the mechanical incomplete combustion loss, that is, the higher the content of unburned carbon particles in the exhaust gases, the lower the thermal efficiency. (5) The greater the heat loss from the furnace wall, the lower the thermal efficiency.