What is a rotary kiln? An ultimate beginner’s guide to how to select a cement rotary kiln and incineration kiln. Zhejiang Tongli Heavy Machinery.
A rotary kiln is a frequently utilized piece of industrial machinery designed for the high-temperature processing and alteration of materials. Typically, it takes the form of an elongated, cylindrical vessel, usually oriented horizontally with a slight inclination. Material is introduced into the rotary kiln at its tail end, and it then progresses steadily along the kiln’s axis before ultimately exiting from the kiln’s head. The fundamental operation of the rotary kiln hinges on subjecting materials to intense heat, leading to various treatment outcomes like drying, calcination, roasting, incineration, smelting, gasification, and more. The specific treatment achieved depends on the particular application and process requirements.
What is the structure of a cement rotary kiln/hazardous waste incineration kiln?
The core parts of the rotary kiln can be divided into cylinder device, support device, transmission device and sealing device. Many customers have very high requirements for the quality of rotary kilns when purchasing rotary kilns. The rotary kiln manufactured by Tongli based on many years of manufacturing experience and combined with the most cutting-edge manufacturing technology has the advantages of high output and good stability.
Rotary Drum Cylinder: The rotary dryer shell is the main body of the kiln, where the material is loaded and rotated. It has a cylindrical shape and is equipped with refractory linings. The drum is heated by the burner to generate hot air or gas that flows through it, either in parallel or countercurrent direction. The drum transfers heat to the material and cause chemical changes to the property of the material.
Supporting Device: rotary kiln supporting device is composed of the supporting roller and thrust roller, the shaft is a forged object to prolong the service life time of the rotary kiln. One thing features about Tongli Supporting device is all the metal casting are produced by our own, the quality is guaranteed. All the metal casting supporting roller, metal casting thrust roller are machined and heat treated, the performance measure is reliable.
Transmission Device: The rotary kiln shell is supported on multiple riding rings usually 2~3, which are attached to the shell with point-welded padding on the inside. The rotary kiln riding rings allow the kiln to rotate smoothly on its axis and help distribute the kiln’s weight. The thickness of the plate under the riding ring is increased to facilitate strength of the shell.
What are the types of rotary kiln?
Feeding Method:
Rotary kilns are categorized based on the moisture content of the materials being fed into them. There are two main types: dry kilns and wet kilns. Wet kilns can further be divided into two subtypes: inflow method and injection method.
Length-to-Diameter Ratio:
The length-to-diameter ratio is a fundamental factor in distinguishing between long kilns and short kilns. Typically, dry kilns have fewer working sections and a length-to-diameter ratio of less than 16, making them short kilns. Wet kilns, on the other hand, tend to be longer, with an aspect ratio ranging from 30 to 40. Spray kilns fall in between, having an intermediate drying process.
Kiln Type:
The geometric shape of the kiln cylinder determines its classification. Rotary kilns can be categorized as straight barrel kilns, cold end expanded kilns, hot end expanded kilns, firing zone expanded kilns, and both ends expanded kilns.
Cooling Method:
Kilns with multiple cooling cylinders fixed at the hot end are referred to as multi-cylinder cooler kilns, distinguishing them from kilns with separate coolers.
Transmission Type:
Rotary kilns can be separated into two types based on their transmission mechanism: girth gear-pinion drive and friction drive rotary kilns. Tongli specializes in manufacturing both of these types.
Function:
Rotary kilns can be further classified based on their primary function. Material processing rotary kilns are designed for processing materials, while incineration rotary kilns are primarily used for the disposal of waste materials.
Heating Method:
Kilns are divided into two categories based on their heating method: internal heating kilns and external heating kilns. Most kilns employ internal heating. In specific industries such as non-ferrous metallurgy and chemical plants, external heating rotary kilns are used for highly toxic materials or when high flue gas concentration and product purity are essential. These kilns use electric heating wires or heavy oil to indirectly heat materials outside the cylinder. Due to their smaller diameter, they are referred to as rotary tubes.
How to select a rotary kiln? Top 10 rotary kiln manufacturer/supplier
- Determine the specific requirements for your project, such as the size, capacity, temperature, and material handling capabilities of the rotary kiln. Also, consider any special features or customization you may need.
- Look for suppliers with a strong reputation for quality and reliability. Check their track record by reading customer reviews, case studies, and testimonials. Consider how long they have been in the industry.
- Assess the technical expertise of the supplier’s team. They should have experienced engineers and technicians who can provide guidance and support throughout the project.
- Visit the supplier’s manufacturing facilities if possible. This will allow you to inspect the quality of their production processes and the materials used in their kilns. Look for modern and well-maintained equipment.
- Ensure that the supplier adheres to relevant industry standards and certifications, such as ISO, CE, or other quality assurance standards. Compliance with safety and environmental regulations is essential.
Who is Zhejiang Tongli Heavy Machinery Co., Ltd
Founded in 1958 Zhejiang Tongli Heavy Machinery Co., Ltd is an equipment manufacturer very famous in China domestic market for making ball mill, vertical roller mill, rotary kiln and all sorts of cement & fertilizer production equipment, even though not as famous as FL Smidth, but Tongli is constantly improving to provide top-tier product and service to global customers. We are dedicated to cement & fertilizer equipment manufacturing. After reading this article, if you still want to know more about rotary kilns, you can follow our tongli official YouTube channel. We will update knowledge about rotary kilns, vertical mills, and ball mills from time to time. The link is attached below:
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Date: 2023–9–27
Author: Richard.Z
