The electric heating rotary kiln, also known as electric rotary kiln, is rotary kiln equipment that uses resistance material as an electric heating element for heating. Electric heating is generally used in indirect heating rotary kilns. The electric rotary kiln is important equipment for roasting metal oxides or chemical products in the non-ferrous metallurgy and chemical industries.
The heating elements of the electric rotary kiln use nickel-chromium alloy (1Cr18Ni9Ti or Cr25Ni20Si2) or iron-chromium aluminum alloy (0Cr13A14 or 0Cr25A15) to make spiral heating elements, which are generally installed on both sides and bottom of the electric heating rotary kiln. There are four groups of heating elements in the electric heating rotary kiln, that is, four heating temperature control zones, and the temperature of each zone can be set separately. Its rated heating power can reach 300 kW, which can meet the heating requirements of electric heating rotary kiln, and the power will be reduced after the stable operation of the equipment. The advantages of the electric rotary kiln heating device are that the kiln pipe is heated on three sides, the heating is uniform and the thermal efficiency is high.
Another type of electric heating rotary kiln heating furnace uses silicon carbide (SiC) as the heating element. There are two rows of silicon carbide rods, 24 in each row. A total of 48 silicon carbide rods are electrified to generate heat to heat the kiln pipe, and the heat is transferred to the material through the pipe wall. The temperature of the electric heating rotary kiln is controlled in three stages, and the temperature inside the furnace body structure is measured and controlled by three thermocouples. By increasing or decreasing the number of 48 silicon carbide rods energized, the temperature required for the oxidation and roasting of the material can be adjusted and controlled to realize automatic temperature control.
As the heating element, the silicon carbide rod is only arranged at the bottom of the electric heating rotary kiln. Although this arrangement is single-sided radiation heat transfer, because the kiln pipe rotates at a uniform speed, the heating of the electric rotary kiln is still very uniform. As the heating element of the electric heating rotary kiln, silicon carbide rods are easy to repair and replace without affecting the thermal efficiency of the rotary kiln and normal working conditions.
The complete system of electric heating rotary kiln consists of feeding device, kiln body, discharging device, electric heating device, control unit, etc. The electric heating device heats the surrounding environment of the materials in the kiln to gradually increase the temperature. When the temperature measured by the thermocouple reaches the requirement, the temperature will not continue to rise, and the material can be discharged after the reaction time reaches the specified value, and the whole process is safe and efficient.
Compared with gas-fired rotary kiln and oil-fired rotary kiln, electric power used by electric rotary kilns is the cleanest energy source. Electric energy can be easily connected to the factory and supplied to the electric heating rotary kiln along with the power supply line.
Cement Rotary kiln, is one kind of lime kiln, belongs to building material equipment. The rotary kiln has wide applications, such as metallurgy, chemical industry, cement, refractory materials, lime, environmental protection and other industries.
Cement rotary kiln, also called clinker kiln, can be divided into dry-process cement kiln and wet-process cement kiln according to the cement production technology. Dry-process cement rotary kiln is mainly used to calcine cement clinker. As the core equipment of NSP cement production line, cement rotary kiln is consist of shell, supporting device, transmission device, lubrication device, moving kiln head, sealing device for kiln tail, burning device and etc. dry-process cement rotary kiln has advantages of simple structure, reliable operation and easy to automatic control in the cement production line.
AGICO Cement is one of leading cement plant manufacturers offers cement kiln and other cement equipment, our cement rotary kiln has been widely applied to many cement plant. Based on 60+ years experience and advanced production equipment, we can provide EPC project and custom-designed solution to cement manufacturing.
Cement rotary kiln is a piece of cement equipment with strong durability, also plays a vital role in the cement plant. If you find any problem in the operation, solve it immediately. In general, the maintenance of rotary kiln is a complex process, here are some tips will be helpful.
First of all, check the fire hole of the rotary kiln is closed or not, ensure the close state to avoid too much cold air. Then, check the windshield of the burner at the kiln door is close to the kiln door. If the air leakage is not closed, it should be pushed to the position of close contact with the kiln door. Third, check the door cover of rotary kiln, if there is the phenomenon of positive pressure ash, should inform the central control to adjust properly. Finally, remember to check air leakage or wear out the phenomenon of resistant material, when you find the above problems, promptly inform the relevant leadership to deal with them.
Check the fish scales sealed in the kiln head, and then check the fitting condition of the fish scales in the rotary kiln and friction ring. If there is any bad condition such as non-fitting, the weight should be adjusted by tightening the device to make it fit. If there is too much aggregate in the reliable rotary kiln, the discharging pipe should be adjusted timely. After that, check the wear condition of the friction ring of rotary kiln. If the friction ring is found to be badly worn or worn out, replace it.
Check the cooling air at the kiln head, and then check the friction between kiln head and the kiln door cover. In order to ensure safety, check the oil film contact of the supporting wheel shaft and thrust plate one by one. Check oil level, oil scoop and oil distribution of rotary kiln. Next, check whether there are impurities, water droplets, oil leakage, collision, loosening and other abnormal conditions, if necessary, the temperature can be measured and control.
The service life of rotary kiln is affected by many factors, such as quality, regular maintenance, etc. AGICO CEMENT ensures the quality of the rotary kiln by strict quality control and advanced technology. Besides, regular maintenance can prolong the useful life of your rotary kiln.
Yes, in order to prevent cold air from entering the rotary kiln and smoke dust from spilling out of the cylinder, the rotary kiln is equipped with a reliable sealing device for the inlet end (tail) and an outlet end (head) of the cylinder, ensuring the sealing performance of the rotary kiln.
The cement rotary kiln produced by AGICO has been optimized and added with e dust filter products for environment protection, which is a new type of environmental protection equipment to reduce the environmental pollution caused by industrial production.
Every Harper rotary tube furnace is designed for the customers unique specifications. We bring innovative solutions to designs for continuous processing of advanced materialssuch as granular, powder, or particulate aggregates in high purity and specialty atmosphere environments at temperatures up to 3000C, including gas, electric and microwave heated systems.
Harper rotaries offer exceptional versatility, reliability and energy efficiency. Our designs include multiple patented features that enable better mixing, resulting in improved heat transfer and mass transfer. The absence of moving parts in the tube support system provides a simple, reliable, robust design that enhances scalability. Additionally, the tumbling action of the product within the tube results in high degrees of temperature uniformity and gas-solid contact, producing a more homogenous product, reducing processing times and increasing production rates.
We also offer the unique ability to accommodate a variety of process atmospheres that others cannot. Our excellent seal designs andfocus on atmosphere control includessystem integration of atmosphere recycle systems, off-gas abatement systems, and controlled atmosphere mixing for tailored process control. These atmospheres include flammables and toxic gases hydrogen, nitrogen, argon, air, oxygen, ethylene, methane, CO2, CO, chlorine gas.
Harper approaches the design of a rotary tube furnace as a complete system, with the ability to incorporate process control systems, gas treatment and handling, turnkey installation and complete field commissioning. Field service can incorporate control instrumentation integration and programming as well as process engineering optimization and support.
Modern applications of advanced materials require the performance and safety that is only achieved by maintaining ultra-high purity powders. Harpers rotary systems consider these high purity applications from beginning to end: material in-feed valves and feeder, high-heat reactor tube, product cooling tube, and material discharge valves and collection. We have the experience to engineer these components, whether they are specialty alloys, fused silica quartz, or technical ceramics such as alumina or silicon carbide, to achieve a chemically inert environment all while maintaining a gas-tight and dust-tight system for your advanced materials.