Production plant air filter application
The air quality requirements of different factories vary widely. Factories with fume hoods and pollution control equipment require large amounts of supplemental air, and if the ambient air in these factories is polluted, the supplemental air must be filtered before it is distributed to the workplace. In the semiconductor production and pharmaceutical industry, the air cleanliness is required to be higher. A typical work environment contains 500,000 particles per cubic foot of air, while the latest requirements for semiconductor production are only 1 particle per cubic foot of air. Therefore, the workshop needs to be cleaned continuously with clean air filtered by HEPA filter. In order to maintain the cleanliness and longevity of the HEPA filter, several prefilters with lower efficiency are also required to be used in combination. Industrial cleanrooms require continuous and efficient removal of smaller particles. The HEPA filter was once the most efficient filter, and now the ULPA filter is the most efficient filter, and a new generation of filters with higher efficiency will also be developed and applied in the future. Microfiberglass filter media is the primary choice for filter media, but membranes and electrostatically enhanced media have penetrated the field and gained some applications. For the exhaust gas emitted by the factory, the most stringent requirement is the toxicity. Some heavy metals such as mercury, arsenic, chromium, beryllium are very toxic, and their emission restrictions are very strict. With regard to air toxicity, the United States and Germany have passed new and stricter legislation. After the implementation of the new legislation, the air toxicity limit was reduced from the original 20mg/m3 (standard) to 010004mg/m3 (standard). To achieve this, factories need more advanced filters to remove submicron particles. Some German companies use traditional pleated micro glass fiber HEPA filters for filtration systems, which cooperate with the pulse air cleaning mechanism and make the filter media more corrugated. A US company has gone a step further by designing a tubular microfiberglass HEPA filter.
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