Technological Innovation | New Energy-Saving Rotary Kiln
Published:
2026-10-13 07:56
Source:
Energy-saving rotary kiln for ferromolybdenum roasting As a critical piece of equipment in the roasting process, it has reached technological maturity after several upgrades; however, during actual operation, due to limitations imposed by its internal structure, the following issues arise: Drawbacks and problems ：
1. A significant temperature difference exists between the inner and outer cylinders, necessitating the installation of an expansion device. Over prolonged operation, this design is prone to weld‑seam cracking and failure.
2. At the expansion joint, the castable material must be provided with an expansion gap; moreover, since the cylinder at this location experiences concentrated thermal expansion and deformation, the castable is prone to spalling and damage, which can subsequently lead to ablation‑induced deformation of the cylinder.
3. After prolonged use, once the insulation material has carbonized, repairing or replacing it becomes extremely challenging: it requires dismantling the entire inner cylinder and removing the castable lining, which in turn necessitates destroying the inner cylinder and rebuilding it from scratch, resulting in a lengthy and complex construction process.
4. The insulation layer at the expansion joint is relatively thin, resulting in poor thermal insulation; moreover, the annular support flange of the inner cylinder conducts heat. Due to these two factors, an annular high-temperature zone develops on the outer cylinder.
5. The internal utilization rate of the kiln shell is low; since production capacity is proportional to the square of the kiln’s effective inner diameter, its throughput remains limited.
New-type energy-saving rotary kiln Modify the rotary kiln shell air duct 、 Insulation layer structural configuration Having successfully addressed the aforementioned issues, compared with previous energy‑saving rotary kilns, it offers the following advantages: Advantages ：
1. For rotary kilns of the same specification, the effective internal diameter is increased. For equipment of the same specifications, output has increased by more than 20%.
2. Internally is Integral structure , without installing an expansion device, not There are instances of weld seam cracking and damage on the cylinder body.
3. The whole Uniform expansion of the cylinder body , there is no concentrated expansion or contraction zone, thereby preventing localized spalling of the castable. Moreover, the castable’s… Increased thickness Up to 120 mm, significantly Extend the service life of the castable.
4. The insulation layer is installed on the exterior of the cylinder. , replacing or repairing the insulation layer does not require dismantling the internal cylinder or the castable lining, and can be done from the outside. Easy and fast construction Quick.
5. Perform insulation work on the entire outer surface of the cylinder. , the construction results are better and more able to Ensure its thermal insulation performance.
6. The heat-exchanged hot air is fed into the rotary kiln for further… Increase equipment hourly output.
7. More suitable for upgrading legacy products. 。
On-site images of a new energy-saving rotary kiln for ferromolybdenum roasting.
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