This shaft kiln is a single-cylinder vertical kiln with a simple structure. Compared with other kiln types, this kiln is easy to construct and simple to lay. The mixing system uses a special mixing system to make the stone and fuel mixed evenly, which is beneficial to the uniform calcination of lime. Rotary distributor is used to distribute the stone material in the kiln, the resistance in the kiln section is the same, and the calcination is stable. The high-pressure centrifugal fan is used in the air supply system, so that the air volume in the furnace can be equalized, so that the combustion in the furnace is more fully and uniformly. High activity, can fully meet the requirements of calcium carbide, steelmaking, sintering, light calcium carbonate and other industries. The ash discharge system uses a combination of a disc type ash discharge machine and a two-stage sealed valve ash discharge machine, and the air lock performance is ideal. Loading, batching, air supply and ash discharge are all controlled by computer automation. The equipment is simple, the operation is flexible, the floor area is small, and the investment is relatively low compared to other kiln types.

The structure characteristics of verytical kiln:

1).The kiln body is circular with an effective height of about 22.0 meters and an effective diameter on the inside of 5.4 meters. The outermost layer of the kiln body is a kiln shell of steel structure, which is built with insulation material. Install thermocouples in the preheating zone, calcining zone and cooling zone of the kiln body to measure the temperature in different areas of the kiln for timely adjustment. In addition, a disc ash unloader is installed to ensure that the finished lime in the kiln is evenly discharged.

2).Configure the PLC to control the operating system. The new energy-saving and environmental protection intelligent mixed-fired shaft kiln system adopts advanced frequency conversion technology, and the control adopts a combination of host computer and PLC control operating system. Realizing the fully automatic way from mixing, feeding, calcining and ash discharge greatly reduces the labor intensity of workers and improves the calcination quality of lime.

Calcination principle of new energy-saving and environmental protection intelligent mixed-fired shaft kiln:

The calcination principle of the mixed-fired shaft kiln is to uniformly mix solid fuel (coke or anthracite) with qualified stones, and then send it into the kiln through a rotary distributor on the top of the kiln. , Calcination zone, cooling zone, and finally fired into qualified finished lime. In the calcination zone, the coke or anthracite in the pre-heated mixture and the secondary air combustion of the cooled lime from the kiln generate heat to make the temperature of the calcination zone uniformly reach 1100-1250 °C, and the calcination of the lime is completed. The auxiliary combustion air duct is added to ensure that the temperature at each point is very uniform, which also ensures that the temperature of the kiln body is uniform.