Local exhaust of ventilation ducts

In the occasions with high noise control requirements, low-noise ventilation duct equipment should be selected. Different types of ventilation duct equipment under the same air volume and pressure, the centrifugal ventilation equipment of the airfoil blade has low noise, and the centrifugal ventilation equipment of the forward version blade has a large noise. Appropriately reduce the speed of ventilation equipment. The rotational noise of the ventilation equipment is proportional to the 10th power of the impeller peripheral speed, and the vortex noise is proportional to the 6th power (or the 5th power) of the impeller peripheral speed. Therefore, reducing the speed can reduce the noise. When designing a ventilation system, the pressure loss of the system should be minimized. When the total amount and pressure loss of the ventilation system are large, it can be divided into small systems. The flow rate of the airflow in the pipeline should not be too high, so as not to cause regeneration noise. To determine the airflow velocity in the pipeline, it should be selected according to the relevant regulations according to different requirements. In the local places where harmful substances are concentrated, set up capture devices to discharge harmful substances to control the diffusion of harmful substances into the room. This ventilation method is called local exhaust. This is the most effective ventilation method for anti-virus and dust removal. The local exhaust system consists of the following parts: (1) Local exhaust hood The local exhaust hood is used to capture harmful substances. Its performance has a direct impact on the technical and economic indicators of the local exhaust system. Local exhaust hoods with good performance, such as airtight hoods, can achieve good working results as long as the air volume is small. Due to different production equipment and operations, the form of exhaust hood is various. (2) Air duct The duct that transports gas in the ventilation system is called an air duct, which connects various equipment or components in the system into a whole. In order to improve the economy of the system, the gas flow rate in the air duct should be reasonably selected, and the pipeline should be short and straight. Air ducts are usually made of materials with smooth surfaces, such as thin steel plates, polyvinyl chloride plates, and sometimes concrete, bricks, and other materials. (3) Dust removal and purification equipment In order to prevent air pollution, when the amount of harmful substances in the discharged air exceeds the emission standard, it must be treated with purification equipment. After reaching the emission standard, it will be discharged into the atmosphere. The purification equipment is divided into two categories: dust collectors and harmful gas purification devices. (4) Fan The fan provides the power for the air flow to the mechanical exhaust system. In order to prevent wear and corrosion of the fan, it is usually placed behind the purification equipment. If the exhaust or air supply is only carried out to local locations, that is, local ventilation; if the entire workshop is exhausted or supplied with air, it is comprehensive ventilation. Generally, ventilation can be divided into local ventilation, general ventilation and accident ventilation according to the scope of action of the ventilation system. The local ventilation system is divided into two categories: local air intake and local exhaust air. They all use local airflow to prevent local work sites from being polluted by harmful substances and create a good air environment.

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