What is a rotary kiln? An ultimate beginner’s guide to the incineration rotary kiln.How to select a good rotary kiln supplier/manufacturer.
A rotary kiln represents a commonly employed industrial apparatus for subjecting materials to high-temperature processing and alteration. This apparatus typically takes the form of a lengthy cylindrical vessel, typically positioned horizontally with a slight inclination. Material enters the rotary kiln via its tail end and proceeds along the axial direction within the kiln before ultimately emerging from the kiln head. The fundamental operating principle of the rotary kiln hinges on the thermal treatment and transformation of materials under elevated temperatures. By subjecting the material within the rotary kiln to heat, diverse treatment effects such as drying, calcination, roasting, incineration, smelting, gasification, and more can be achieved, contingent upon the specific application requirements and process demands.
What are the types of rotary kiln?
Length-to-Diameter Ratio:
The length-to-diameter ratio serves as the fundamental criterion for distinguishing between long kilns and short kilns. Typically, dry kilns are characterized by a shorter length-to-diameter ratio of less than 16, designating them as short kilns. On the other hand, wet kilns tend to be longer, with an aspect ratio ranging from 30 to 40. Spray kilns, used in certain applications, fall in between these two categories in terms of drying duration.
Feeding Method:
Kilns are initially classified based on the moisture content of the materials being fed into them. Dry kilns and wet kilns are the two primary categories. Wet kilns, in turn, can be further subcategorized into those utilizing the inflow method and those employing the injection method.
Cooling Method:
Kilns may incorporate multiple cooling cylinders fixed at the hot end, resulting in what is known as a multi-cylinder cooler kiln. This distinguishes it from kilns equipped with separate cooling systems.
Kiln Type:
Kilns are further classified based on their geometric cylinder shape. This includes straight barrel kilns, cold end expanded kilns, hot end expanded kilns, firing zone expanded kilns, and both ends expanded kilns.
Transmission Type:
Rotary kilns can be categorized by their transmission mechanisms. Two common types are girth gear-pinion drive and friction drive rotary kilns. Tongli is a reputable manufacturer specializing in both of these transmission systems.
Heating Method:
Kilns can be divided into internal heating and external heating types. Most kilns fall under the category of internally heated kilns. However, in non-ferrous metallurgy and chemical plants where highly toxic materials are processed or stringent purity standards are required, external heating rotary kilns come into play. These kilns employ electric heating wires or heavy oil to indirectly heat materials outside the cylinder. Due to their typically smaller diameter, they are commonly referred to as rotary tubes.
Function:
Depending on their intended purpose, rotary kilns can be split into two main categories: incineration rotary kilns and material processing rotary kilns. Material processing rotary kilns are used for various processing tasks, while incineration rotary kilns primarily serve in the disposal of waste materials.
What is the core parts of a incineration rotary 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.
Kiln 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.
Kiln 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.
Kiln 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.
How to select a rotary kiln manufacturer? Top 10 rotary kiln manufacturer/supplier listing
- 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.
Have you heard of 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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Author: Richard.Z
Date: 2023–9–27
