Lime Kiln Preheater

The lime rotary kiln calcination is the main way of active lime production and has big capacity. It also has particular advantages in calcination of small size limestone. Meanwhile, lime rotary kiln operating rate is high, which make it own a place in the iron and steel, calcium carbide and other fields. Lime kiln preheater is an important component of the lime kiln. The flue gas in the tail flue of the boiler can be heated to a certain temperature by the heat radiating fins inside the boiler, which is used to improve the heat exchange performance of the boiler and reduce the energy consumption. Compared with the old shaft kiln, lime rotary kiln with a preheater heat consumption per unit of production is less than 4800 kJ.
Air preheater heat transfer element consists of a thin sheet arranged very dense, which per unit volume of heating surface is very high, The low temperature in the lower part of the metal make it easy to foul, which is source of ignitionHeat sink absorbed the heat of the flue gas arrive to the air side with rotation of the air preheater and then transfer the heat to the air. In the process of production lime kiln preheater is prone to fire accident, There are two reasons. on one hand, a large number of unburned combustible deposition is a key element in heat transfer, on the other hand, Air preheater rotate slowly when it start working. The flue gas inlet and air inlet remain are unchanged. The flue gas enters the air preheater and discharges from side, In operation process we should pay attention to security measures. If there is a fire accident, take effective measures in time instead of panic. The ignition of the air preheater is usually originated from the lower part of the middle layer and the heat transfer element at the end cold. It needs a long time from a local minimum area of fire to a large area of combustion, usually 1~2h, and sometimes longer. We should determine whether it fire as soon as possible in order to reduce the loss. We can estimate whether it fired according to air preheater endpoint temperature and Observation hole. when fire is serious there is smoke leakage or obvious radiation, chimney smoke black smoke。
When it is found that the air preheater is on fire, manual MFT, draught fan should be immediately stopped, insulate air preheater, close the air preheater inlet and outlet baffle. Keep the air preheater rotating, fire control water and spray nozzle cleaning conduit road put fire immediately, at the same time open smoke duct drainage. At this time ensure if the fire water is critical. The air preheater can not open into the hole after the fire to prevent air to enter the combustion. As a last resort, such as, fire water and cleaning water pipeline failures without water inputs. can open the hole and put out the fire with fire power plant. Note that the fire must be thoroughly and carefully check in case of leaving troubles.
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