Chimney calculation
Thread Content
Given the volume of flue gas and the concentration of pollutants emitted, how can one calculate the height and diameter of the chimney, etc.? Are there any standards that can be referred to? Has anyone expert done it?
The diameter is mainly determined by the flow rate selection, while the design requirements for chimney height must be very strict. I usually refer to the \"Industrial Ventilation Design Manual\", taking into account local environmental regulations as well.
This is my first time building a chimney. According to environmental regulations, 15 meters is sufficient. How should I determine the flow rate? I would appreciate some guidance
The exhaust flow velocity should be around 15 m/s. When a steel pipe chimney is used and its height is large or the amount of flue gas is high, the exit flow velocity can be appropriately increased to around 20 m/s–25 m/s.
The value is generally around 15 m/s.
To calculate the chimney duct, follow these steps: 1. Determine the height in accordance with the requirements of environmental protection authorities; it must meet relevant national standards and be higher than surrounding buildings. The chimney height should comply with GB3095 \"Environmental Air Quality Standards\". 2. First, calculate the pipe diameter based on temperature and the recommended flow velocity – for forced ventilation, the flow velocity at full load is 12–20 m/s, 10–15 m/s for natural ventilation, and 2.5–3 m/s at low load; generally, the upper limit is not used. 3. Then calculate the chimney resistance and the required suction force to decide whether to use natural ventilation or forced ventilation with a fan. This is roughly the process involved