The Impact of Fuel Combustion. In normal production, the volatile matter produced by raw materials during calcination is the primary source of heat. Therefore, volatile matter must be fully utilized while also being strictly controlled. If volatile matter is insufficient, it must be promptly replenished with gas. Otherwise, the calcination temperature will drop, affecting calcination quality. If volatile matter is excessive, the gas valve should be closed and the volatile matter pull plate adjusted to control the amount of volatile matter supplied. Otherwise, excessive volatile matter will cause individual flue temperatures to overheat, potentially damaging the furnace. Therefore, in production, to ensure consistent flue temperature in the calciner, the raw material ratio, volatile matter, and gas dosage must be strictly controlled and adjusted promptly.
The Impact of Air Quantity. The amount of preheated air entering the calciner flue is also a crucial factor in ensuring consistent flue temperature and calcination quality. Only with a properly adjusted air quantity can the fuel be fully burned, the flue temperature of the calciner reach a high temperature, and calcination quality be guaranteed. Insufficient air flow results in incomplete combustion, lowering the temperature of the flue. Furthermore, combustion may continue after entering the regenerator or flue, potentially damaging the equipment. Excessive air flow removes heat from the flue, lowering the flue temperature and reducing calcination quality.
The Impact of Negative Pressure. Controlling furnace negative pressure is also crucial. Ideally, the negative pressure at the top of each furnace chamber should be between 49 and 98 Pa, with the negative pressure within the tank close to zero. Excessive negative pressure increases air flow within the flue, leading to significant heat loss. Too little negative pressure hinders the extraction of volatiles, resulting in insufficient preheating air and incomplete combustion. Therefore, in furnace operation, maintaining a constant calcination temperature and improving raw material calcination quality is crucial by carefully understanding the relationship between the supply of gas, air, and volatiles and the negative pressure, and strictly adhering to production and technical operating procedures.
The sealing of the calciner and the cooling of the calcined material are also crucial. Poor furnace sealing can lead to burnout of raw materials, lower flue temperature, or even damage to the furnace itself. In particular, the discharge device must have good sealing performance; otherwise, the hot calcined material will be oxidized in large quantities, and the discharge equipment will be burned. At the same time, the cooling effect of the cooling device of the calcined material must be good so that the calcined material can be cooled quickly.