Principles for Determining Air Supply Strength at the Bottom of Reheat Furnaces
The bottom of reheat furnace is the exhaust outlet of the furnace, through which the flue gas generated by the burning of combustible materials is discharged. The temperature of flue gas during the reheating process is around 500 °C. If the temperature is too high, the furnace may be damaged, thus reducing its service life. Therefore, it is very important to determine the air supply strength of the bottom of the reheat furnace correctly. The following are the principles for determining air supply strength.
1. The air supply strength should be determined in accordance with the local air quality standards, which may be slightly lower or higher than the regional air quality standards. This is because the air quality in the factory may be affected by the characteristics of the surrounding environment or the plants operating in the factory. Therefore, it is necessary to have a detailed inspection before determining the air supply strength.
2. The air supply strength should be in accordance with the technical parameters provided by the furnace manufacturer. These parameters must take into account all aspects of the furnace, including thermal efficiency, air temperature, air temperature rise, air pressure drop and air flow rate. It is very important to pay attention to the temperature, because if the temperature increase caused by air supply is too large, it is easy to cause damage to the furnace wall or other parts. In this way, the air supply strength of the bottom of the reheat furnace should be determined correctly.
3. The air supply strength should be determined based on the fuel and combustion products generated by the furnace. Different fuels, such as coal and gas, have different characteristics, and the combustion products generated are also different. In addition, the flue gas generated by the burning of combustible materials varies from season to season. Therefore, the air supply strength should be adjusted according to the specific situation.
4. The air supply strength should be determined according to the features of the furnace. Different types of furnaces may have different resistance coefficients in the flue, and the air supply strength should be adjusted accordingly. Otherwise, it is easy to cause the furnace products to be incompletely burned or heated due to the imbalance of air supply.
In conclusion, the air supply strength should be determined in accordance with local air quality standards, the technical parameters provided by the furnace manufacturer, the fuel and combustion products generated by the furnace and the features of the furnace. Only by doing so can we ensure the normal operation of the furnace and prolong its service life.
