Many high-rise buildings, underground works, traffic tunnels and public entertainment places have suffered heavy casualties due to fire accidents, which makes people clearly realize the importance and necessity of designing and installing smoke control systems and ensuring their long-term good performance. The fact of the fire tells us that when a fire happens, the smoke control system can effectively control the spread of smoke; And the smoke is quickly and timely, which plays a key role in saving people and disaster relief. It is an important fire control facility related to the success or failure of emergency rescue and disaster relief. It must be well designed, installed and maintained to ensure long-term good performance during the service life. According to the requirements of building regulations, the system consisting of all smoke exhaust facilities must be set in the building is called smoke exhaust system. In the power plant, the smoke exhaust system consists of induced draft fan, flue, gate and chimney. Its task is to exhaust the flue gas produced by the combustion of furnace fuel.

The function of smoke prevention system is to effectively control the smoke in the designated smoke prevention area when the fireworks disaster occurs in the building, to prevent it from spreading to other areas, to reduce the large-scale damage in the building and to reduce the difficulty of saving people and providing disaster relief. The function of the smoke exhaust system is to start quickly when a fireworks disaster occurs in the building, and to exhaust the smoke out of the building in time, so that evacuees and disaster relief personnel are not trapped by fireworks, reducing casualties and property losses. Create favorable conditions for saving lives and extinguishing fires. Many major fire accidents in the world today have caused a large number of casualties and heavy property losses, mainly smoke and flames at the scene of the fire. What is more harmful between the two is smoke. Smoke has added many difficulties and obstacles for people trapped in the fire scene to escape. Black smoke makes people can't see clearly, can't find the way to escape, has difficulty breathing, can be poisoned by inhaling smoke, or even suffocate, and can't escape from the fire.