2023年5月24日
(袋式过滤)高温过滤介质概述
目前,工业污染是中国PM2.5的最大来源,水泥制造业、燃煤电厂和钢铁冶金是工业污染源中的三大罪魁祸首。因此,在PM2.5的治理中,工业除尘是不可忽视的。然而,工业除尘并不是一件容易的事情,因为工业烟气是热的,而且往往含有酸性和碱性气体,这对工业除尘的技术和材料要求很高。目前工业除尘的主流技术有两种,即静电除尘器和袋式除尘器。在此基础上,推导出了电袋式复合除尘器。一、袋式除尘器——工业粉尘治理的主流技术目前国内静电除尘器技术已达到成熟应用阶段,袋式除尘器技术正处于快速发展时期。然而,随着国家对控制工业烟气污染的要求不断提高,单靠静电除尘器技术已不能完全满足要求。采用袋式除尘器技术和静电袋式复合除尘器替代静电除尘器技术已成为主流。袋式除尘器的工作原理:采用特殊纤维制作滤袋,将含尘气体注入滤袋中,将粉尘过滤捕获。过滤效果取决于过滤袋的质量。 Structure of Bag Filter (Source: Hitachi Plant Construction, Ltd. 56 ) II. High-temperature Filter Material - The core material of bag filters Filter Bag (Source: Yuanchen Technology) The filtering effect of bag filters is achieved through filter materials. Different filtering effects can be achieved by equipping various types of filter bags with different properties, such as resistance to normal temperature(<130℃), resistance to high temperature(>130℃), corrosion resistance, water and oil repellency, fire and explosion prevention, and long service life (2-4 years). The changes and innovations in bag filter technology are closely related to the transformation of filter materials. Currently, the main high-temperature filter fibers used for flue gas treatment domestically and internationally include PPS (polyphenylene sulfide), Nomex (aromatic polyamide), P84 (polyimide), PTFE (polytetrafluoroethylene), glass fibers, and PSA (polyphenylene sulfone) fibers. In practical applications, multiple fibers are often used in combination. Production processes include needle punching, surface coating, emulsion impregnation, etc., which can achieve surface filtration and gradient filtration effects. This not only improves the dust collection efficiency but also reduces pressure loss, facilitates dust cleaning, and saves energy consumption. III. I...
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