【Q&A】Catalytic Coking Reformate Blending Edition 20170814

(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) Reduce the heat loss from boiler exhaust gases. 1) Lower the air leakage rate of the air preheater, especially that of rotary air preheaters. 2) Strictly control the quality parameters of the water in the boiler; when the scale accumulation in the water wall tubes reaches 400 mg/m³, acid cleaning should be carried out promptly. 3) Use high-quality coal with low sulfur content as much as possible, and reduce the temperature of the air entering the air preheater. Modern large-capacity power generation boilers are equipped with air preheaters to prevent dew formation on the cold end surfaces of these preheaters, which could lead to corrosion at low temperatures. Raising the temperature of the air entering the air preheater increases the exhaust gas temperature (thus increasing heat loss), which helps to extend the service life of the air preheater. (2) Reduce the heat loss due to incomplete combustion. 1) Adjust the combustion conditions according to the boiler’s load and operating time, ensure proper air distribution, and lower the position of the flame center in the furnace as much as possible so that the coal can burn fully inside the furnace. 2) Adjust the amount of coal fed into the furnace based on the volatility of the raw coal and the operating time, keeping the coal supply at an optimal level. (3) Reduce the heat loss from the boiler by improving the maintenance and inspection of the insulation layers around the boiler’s pipes and structure.

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 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 walls, the lower the thermal efficiency.

(1) The higher the flue gas temperature of the furnace, the lower its thermal efficiency. (2) The larger 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 level of flue gas temperature (2) The value of the excess air coefficient (3) Leaks in the furnace body and heat loss through the furnace walls (4) Ash accumulation on the surface of the furnace tubes (5) The quality of fuel combustion

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 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 walls, 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 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 walls, the lower the thermal efficiency.

(1) The level of flue gas temperature (2) The value of the excess air coefficient (3) Leaks in the furnace body and heat loss through the furnace walls (4) Ash accumulation on the surface of the furnace tubes (5) The quality of the fuel combustion process

The main factors affecting the thermal efficiency of a heating furnace are as follows: (1) The higher the flue gas temperature of the furnace, the lower its thermal efficiency. (2) The larger 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 level of flue gas temperature (2) The value of the excess air coefficient (3) Leaks in the furnace body and heat loss through the furnace walls (4) Ash accumulation on the surface of the furnace tubes (5) The quality of fuel combustion