1. Introduction to lime
Quicklime is also called burnt lime. Its main component is calcium oxide. The usual preparation method is to calcine the natural rock whose main component is calcium carbonate at high temperature to decompose into carbon dioxide and calcium oxide (chemical formula: CaO, that is, quicklime, also known as cloud stone). All natural rocks with calcium carbonate as the main component, such as limestone, chalk, dolomitic limestone, etc., can be used to produce lime. In coastal areas, shells are used as raw materials and are burned into shell ash, which is used as quicklime.
2. Introduction to quicklime production process
First, the limestone is stored in the silo, and the feeding amount is controlled by the upper and lower level gauges. Then the limestone is evenly distributed to each chamber of the preheater through the discharge pipe. In this process, the limestone is 1150 The kiln flue gas is heated to about 900 degrees Celsius, about 30% decomposes, and then pushed into the rotary kiln through the hydraulic push rod. The limestone undergoes a chemical reaction in the rotary kiln and is decomposed into CaO and CO2 after roasting. After decomposition, the lime is generated and enters the cooling system. The cold air blown in the cooler is cooled to below 100 degrees Celsius and discharged, and the 600 degrees Celsius hot air after heat exchange enters the kiln to mix fuel with gas. The waste gas is mixed with cold air and enters the bag dust collector through the induced draft fan, and is discharged into the chimney through the exhaust fan. The lime discharged from the cooler is sent to the lime storage through vibrating feeder, bucket elevator, belt conveyor and other equipment. Determine whether to perform screening and other processes according to user needs. In the entire lime roasting system, the preheater is divided into several preheating chambers according to different outputs. Each preheating chamber is equipped with a hydraulic pushing device and an automated control system to transmit relevant data to the PLC control platform in the central control room. , to achieve centralized control.
