Analysis of the advantages and disadvantages of the components of the purification project

Classification of purification projects: 1. Turbulence flow: the air enters the clean room from the air-conditioning box through the air duct and the air filter (HEPA) in the clean room, and returns to the air from the partition walls or elevated floors on both sides of the clean room. The airflow is in a state of irregular turbulence or eddy current due to non-linear motion. This type is suitable for the clean room class thousand - one hundred thousand. Advantages: simple structure, system construction cost, and easy expansion of clean room. In some special-purpose places, dust-free workbench can be used together to improve the level of clean room. Disadvantages: The dust particles caused by turbulent flow are not easy to be discharged in the indoor space, and it is easy to pollute the process products. In addition, if the system is stopped and reactivated, it often takes a long time to achieve the required cleanliness. 2. Laminar flow: The laminar air flow moves into a uniform straight line. The air enters the room through a filter with a coverage rate of 100%, and returns to the air through the raised floor or partition panels on both sides. This type is suitable for clean room grades. It needs to be used in a higher environment, generally its clean room grade is Class1~100. Its types can be divided into two types: (1) Horizontal laminar flow: the horizontal air is blown out from the filter in one direction, and is returned by the return air system of the opposite wall, and the dust is discharged outdoors with the wind direction. Generally, the pollution is higher on the downstream side. serious. Advantages: The structure is simple, and it can become stable in a short time after operation. Disadvantages: The construction cost is higher than that of turbulent flow, and the indoor space is not easy to expand. (2) Vertical laminar flow: The ceiling of the room is completely covered with ULPA filters, and the air is blown from top to bottom, which can achieve higher cleanliness. The dust generated during the process or by the staff can be quickly discharged outside without affecting the other work areas. Advantages: easy to manage, stable state can be reached within a short time after the operation starts, and it is not easy to be affected by the operation state or the operator. Disadvantages: The construction cost is high, the flexible use of space is difficult, the ceiling hanger takes up a lot of space, and the maintenance and replacement of the filter is troublesome. 3. Compound type: The compound type is a combination or combination of turbulent flow and laminar flow, which can provide local ultra-clean air. Previous: What are the application scopes of purification engineering? Next: What are the standard indexes of the 100,000-level purification pharmaceutical cleanroom?
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