What Is a Chimney Pipe?

A multi-pipe chimney is mainly a ventilation structure consisting of a chimney, a concrete shell and a foundation. In a large thermal power plant, several independent chimneys are grouped together. Also known as cluster chimney.

Multi-pipe chimney

In large

The multi-pipe chimney is mainly composed of a chimney, a concrete shell (or a tower support) and a foundation. Chimney: It can be welded by steel plates or cast by reinforced concrete. The chimneys cast with reinforced concrete are segmented and free standing. The segmented type is that each chimney is divided into several sections and supported by various floors connected with a concrete shell. The self-supporting type is the self-supporting load of each chimney. There is a floor slab every 40 meters between the chimney and the concrete shell. The chimney can also be built in sections with special refractory bricks, each about 10 meters long, supported on the beam between the corbel on the concrete shell and the chimney. Concrete shell: also known as windshield. It is mainly used to withstand the static deflection effect under wind pressure and the dynamic effect of leeward eddy current. When a segmented chimney is used, it can also bear the load of the chimney. The concrete shell is generally about 10 meters lower than the chimney, and is equipped with a certain number of aviation police lights and ventilation windows. Foundation: Generally, a caisson concrete foundation is used, and a good foundation is required in order to bear the load of tens of thousands of tons in the upper part. In addition, the inner wall or outer wall of various chimneys need to be laid with different thermal insulation and anticorrosive materials or built with anticorrosive and refractory bricks. An elevator room is generally provided in the middle of the multi-pipe chimney. All forms of chimneys need to be equipped with lightning protection devices. Lightning rods are set on the tops of the chimneys and concrete shells of multi-pipe chimneys, and they are connected with crown iron hoops set at different pole heights. At the same time, metal hoops are connected with metal conductors, and they are connected with buried grounding devices to form a lightning protection grounding system . For a multi-cylinder steel chimney supported by an iron tower frame, it only needs to be connected to the grounding system.

There are mainly three types of structure of multi-pipe chimneys: the inside is several concrete or brick chimneys, and a concrete shell is used to coat it. Countries such as the United Kingdom and China have adopted more. Use steel structures such as iron towers to support several steel chimneys together. Japan and Germany use more. There are several steel chimneys inside, and a concrete shell is used. The Soviet Union, the United States and other countries adopted more.