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The steel chimney, as a crucial part of industrial equipment for emitting exhaust gases, directly impacts the safety and environmental efficiency of boilers and other combustion devices. The self supporting steel chimney is an independent structure that does not rely on external support and is widely used in environments that require stable support and efficient exhaust. This article will focus on the self supporting steel chimney design features and applicable scenarios.
In some situations, traditional steel chimneys may not provide sufficient support or bear too much weight, especially when the surrounding environment cannot offer external support. At this time, opting for a self supporting steel chimney becomes an ideal solution. The self supporting steel chimney adopts a self-supporting design, requiring no additional external support structures. It can independently and stably operate without fixed supports like plant steel frames. This type of chimney is particularly suitable for newly-constructed industrial facilities or high-load environments and can effectively avoid safety risks caused by plant structures being unsuitable for support.
Self supporting steel chimney design consider multiple aspects to ensure its stability and safety. The following are the key design parts:
Foundation Piles: Supporting the Entire Structure
Due to its significant weight, the self supporting steel chimney requires a sturdy foundational support. The foundation piles adopt a form of reinforced cages and anchor bolts to ensure a firm connection between the chimney shaft and the ground. Steel plates compatible with the anchor bolts will be reserved on the ground for easy installation and fixation of the chimney. The foundation part of the design provides ample support force for the chimney, preventing tilting or displacement over extended use.
Base Design: Enhancing Structural Stability
The base of the chimney includes a ground flange, pressing plate, and reinforcing ribs to ensure a firm and reliable connection between the chimney and its foundation. The flange is fixed to the pre-embedded steel plate through welding and matches with the foundation steel plate via anchor bolts. Usually, the flange holes are slightly larger than the bolt size to avoid errors during installation. Reinforcing ribs are used at the base to prevent deformation at the rear end of the chimney.
Silo Design: Enhancing Durability and Safety
The chimney shaft is typically made from steel plates ≥6.5mm in thickness, offering high strength and corrosion resistance. The lower end of the shaft is equipped with a cleaning port and drain port for easy maintenance and drainage. The cleaning port consists of a sleeve with a flange and a cover plate, reasonably designed to save costs. The foundation part has a slight slope to effectively drain water, keeping the shaft interior dry. To enhance the anti-deformation ability of the shaft, support structures are installed every 2-3 meters to ensure the chimney's stability under high temperature and pressure.
Connection Design: Ensuring Solidity and Ease of Hoisting
The connection parts of the self supporting steel chimney use flange connections, with additional reinforcing ribs on each flange to enhance the stability of the connection points. The flanges between the two sections of the chimney are slightly smaller in size compared to the base flange, with each connecting flange set up with lifting lugs for easy hoisting and installation. The uppermost flange of the chimney is not perforated, used to fix the lightning rod to ensure system safety.
Lightning Protection Device: Preventing Lightning Strikes
Due to the considerable height of the chimney, it is prone to lightning strikes. Therefore, it is equipped with a lightning protection device. This device includes a lightning rod, conductor, and support structure. The lightning rod is fixed at the chimney top, with the conductor made of galvanized pipe. The conductor support is installed on the chimney shaft through welding, ensuring the entire system can effectively guide lightning current to the ground, avoiding damage to the chimney from lightning strikes.
The advantages of the self supporting steel chimney design make it a common exhaust device in industrial facilities. Its stable structure, sturdy materials, and good corrosion resistance enable it to operate stably under high load and high temperature environments for a long period of time. Rainbow is dedicated to providing customers with high-quality self supporting steel chimney systems and professional technical support and services.
