Common problems in industrial ventilation duct design
(1) Division of ventilation system. Some factories are often divided into one system for their own interests or convenience, which not only can not achieve good ventilation effect, but also bury hidden dangers for factory operation. When the industrial area is large and multiple exhaust and supply points are installed, a unified and connected management system can be designed to integrate the total fan and multiple exhaust points. The division of the system can combine the industrial production nature, process, time, operating parameters, and the demand for air, humidity, temperature and other factors. The same or similar can be divided into one system for unified management. However, the two gases that are easy to mix and will produce more toxic gases after mixing, or are easy to cause fire and explosion, must not be divided into one system, but should be designed as an independent ventilation system .
(2) Material selection and section shape of ventilation duct. The material and section shape of the pipe are the root of realizing the good benefits of industrial pipe ventilation. Once the wrong material or shape is selected, it will not only damage the beauty of the industrial building structure, but also fail to achieve the ventilation effect and purpose, and even bury hidden dangers in the use stage of the ventilation pipe due to the poor material. On the one hand, it is necessary to select the correct pipe material. For example, alloy steel with high heat resistance and wear resistance should be selected around the melting furnace in consideration of its high temperature resistance. On the other hand, it is very important to choose the appropriate shape of pipe section. In general, circular is more suitable for pipes with high-speed flow requirements; When the pipeline section is large, it is more appropriate to select a rectangle, which also plays an auxiliary role in improving the utilization of space.
(3) Layout of ventilation ducts. The layout of the ventilation duct should be as convenient as possible to keep the duct smooth and straight. At the same time, the equipment used for adjustment and detection can be installed in the ventilation duct to facilitate real-time and systematic management of the operation of the ventilation duct. In addition, it also needs to be designed according to the actual ventilation demand. For example, when the transported gas contains liquid, the ventilation duct can be arranged in a slope shape to achieve the purpose of eliminating liquid accumulation.
(4) Temperature balance of ventilation duct. The temperature balance of the ventilation pipe is a very important link. Once the design is unreasonable, it is very easy to cause the pipe rupture due to the high or low temperature, or the long-term humid environment. Especially, because the ventilation duct will bring a large amount of heat, cooling capacity and energy consumption during operation, there are high requirements for the temperature control structure of the ventilation duct, which usually includes three layers of protection: thermal insulation, moisture-proof and protective layer. The insulation layer is the core of the pipeline. The damp proof is to avoid the contact between the pipeline material and water and steam, while the protective layer is to protect the insulation layer and damp proof layer from damage.
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