What is the purpose of the area where the flue gas exits and enters the chimney?

The area where the flue gas exits into the chimney is primarily used to discharge the waste gases generated by combustion. During combustion, fuels such as coal, oil, and natural gas produce flue gases containing various harmful substances, such as sulfur dioxide, nitrogen oxides, and particulate matter. These flue gases need to be treated through environmental protection facilities before being released into the atmosphere in order to reduce their impact on the environment and human health. This emission process involves the flue gas entering the chimney through the exhaust outlet and then being released into the atmosphere. As for the claim you mentioned that \"the resistance will be low,\" this may involve principles of fluid dynamics. As flue gas flows through flues and chimneys, it is affected by friction and resistance, which are related to the design, diameter, length, shape of the flues and chimneys, as well as the temperature and flow rate of the flue gas. When designing the flue gas outlet and chimney, engineers strive to optimize these parameters in order to reduce resistance and improve the efficiency of flue gas emission. A well-designed flue gas outlet and chimney can ensure: 1. Smooth flow of flue gas, reducing energy consumption and resistance during emission. 2. Raise the emission height of the flue gases, utilizing the \"natural suction effect\" of chimneys to allow the gases to disperse at a higher altitude, thereby reducing ground-level pollution levels. 3. Ensure the effective operation of environmental protection facilities, such as flue gas desulfurization, denitrification, and dust removal systems. 4. Complies with environmental emission standards and regulatory requirements. In summary, the design of the flue gas outlet leading to the chimney is aimed at ensuring that the flue gas can be discharged into the atmosphere effectively and safely, while also taking into account economic efficiency and environmental protection. The low resistance considered during design ensures efficient flue gas flow as well as energy conservation and emission reduction. .

It can be understood as a flow guiding bend, designed to reduce the resistance of the fluid as it passes through the elbow. For reference.

Thank you for your answer. In which book can I find a similar introduction?

““For reference only”, for informational purposes only. The standards outlined in books all stem from practice, and all actions are constrained by those book-based standards; it’s unclear whether humanity can still develop further. For reference only.

I don’t think it should be like this; reducing resistance requires a gradual process, and the diameter of the tube can be increased step by step

The right-angle direction change has been optimized into a smooth, gradual transition, which reduces the resistance in the flow channel

It can reduce resistance; the aerodynamic resistance of a right-angle turn is greater than that of a 45° turn. (Theoretical support is necessary; fluid simulation software can be used for this purpose.) I’ve encountered cases where three pumps were used, with one as a backup; when pumps #1 and #3 were in operation, the flow rate would decrease, but this problem disappeared after the pipes were modified.

This post was last edited by wanlirn on 2023-12-7 at 13:43. What evidence is needed for this? Do you find it harder to turn a right angle or to turn on a large arc while driving?

Inside such a structure, there is a flue gas deflection baffle.