Lime Rotary Kiln Equipment List Clinker 280t/d Cement Production Line

Lime Rotary Kiln Equipment List Clinker 280t/d Cement Production Line

Rotary kiln refers to rotary calcining kiln (commonly known as rotary kiln), which belongs to the category of building materials equipment. Rotary kilns can be divided into cement kilns, metallurgical chemical kilns and lime kilns according to different materials.Cement kilns are mainly used for calcination of cement clinker, divided into two categories: dry production cement kilns and wet production cement kilns. Metallurgical chemical kilns are mainly used for the magnetic roasting of lean iron ore in the metallurgical industry; oxidative roasting of chromium and nickel iron ore; roasting high alumina bauxite ore in refractory plants and roasting clinker and aluminum hydroxide in aluminum plants; roasting chrome ore in chemical plants And minerals such as chrome ore powder.Lime kiln (i.e. active lime kiln) is used to roast active lime and light-burned dolomite used in steel plants and ferroalloy plants

Rotary kiln process

1. Principle of rotary kiln

No matter what kind of rotary kiln, its technology is almost the same principle. At present, we only introduce and analyze the wet-process rotary kiln technology. At present, the wet-process rotary kiln body produced by Hongxing Company is usually relatively long (length-to-diameter ratio is 30-40). In order to increase the heat transfer area of the kiln, chains are often hung at the end of the kiln to accelerate the evaporation of water. In the production of wet-process rotary kiln, water is added to the raw meal mill to make the raw meal into a slurry with a water content of 30% to 40% in the rotary kiln. The slurry that meets the requirements after homogenization is fed into the kiln by the kiln head feeder The mature material is calcined, and the clinker out of the kiln is cooled by a cooler and sent to the clinker silo. The raw coal is dried and ground into pulverized coal and then burned to supply the heat required for the clinker calcination.

2. The characteristics of wet-process rotary kiln calcination

Since the raw meal is made into a slurry, it has strong adaptability to heterogeneous raw materials, uniform raw meal composition, stable process, high quality clinker fired, high clinker strength grade, less dust during grinding, and fly ash at the end of the kiln less. However, evaporating 30%-40% of the slurry moisture in wet production requires a large amount of heat, and the energy consumption accounts for 1/2 to 1/3 of the cost of cement, which is higher than that of shaft kilns and dry rotary kilns. Due to high heat consumption, high energy consumption, high water consumption during production, and water consumption in wet production, my country has listed wet cement production as a restricted and eliminated type of kiln.

The rotary kiln (rotary kiln) is a cylindrical object with a certain slope, the slope is 3～3.5%, and the rotation of the kiln is used to promote the mixing of the materials in the rotary kiln (rotary kiln), so that the materials are mixed and contacted. reaction. The kiln head is sprayed and burned to produce a lot of heat, which is transferred to the material by means of flame radiation, convection of hot air, and conduction of kiln bricks (kiln skin). The materials move forward in the kiln depending on the inclination of the kiln shell and the rotation of the kiln.