The primary function of a chimney is to exhaust smoke and flue gases, improving combustion conditions. In high-rise buildings, there are typically varying numbers of stairwells, ventilation ducts, air supply ducts, smoke exhaust ducts, elevator shafts, and pipe shafts, etc. Vertical shafts. When the indoor temperature is higher than the outdoor temperature, the warmer air inside, being less dense, naturally rises along these vertical channels. It escapes through gaps in windows and doors and various openings from the upper part of the building. Cold air from outside, being denser, infiltrates from the lower level to compensate. This forms the chimney effect. The chimney effect is the result of the combined action of the heat pressure caused by the indoor-outdoor temperature difference and the wind pressure outside, with the former usually being predominant. The heat pressure value is directly proportional to the air density difference caused by the indoor-outdoor temperature difference and the height difference between the intake and exhaust openings. This indicates that the higher the indoor temperature is above the outdoor temperature and the taller the building, the more pronounced the chimney effect becomes. It also suggests that the chimney effect in residential buildings generally occurs only during winter. Theoretically, the midpoint of the building's height is considered the neutral plane, with rooms below this plane admitting air from outside and rooms above this plane expelling air indoors.
Key considerations in the construction of chimney corrosion protection include:
1. The construction site must be clean and tidy, with ventilation measures in place, and the content of harmful gases must not exceed the specified requirements. Flammable materials, except for paints used in the anti-corrosion of chimneys, are strictly prohibited from being stored on the construction site. That is to say, pay attention to environmental safety and keep the site clean.
2. Smoking is strictly prohibited on the site. Welding or open flame operations are not allowed within a 10-meter radius. Explosion-proof lighting equipment must be used during construction. Construction workers should wear necessary protective gear. Work inside containers should be rotated, and adequate ventilation facilities must be in place. Anti-slip measures should be taken, and workers must wear safety belts.
3. The chimney anti-corrosion construction is complete. When cleaning tools and containers containing waste solvents, do not pour them carelessly and dispose of them properly. In case of any accidents, place them in designated areas.
