"Baghouse" là một thuật ngữ phổ biến cho các thiết bị bộ sưu tập mà sử dụng túi vải để bộ lọc của một dòng khí. Túi lọc được đặt trên một tubesheet và kèm theo trong một nhà ở tấm kim loại. Nhà ở có thể nhìn thấy từ "baghouse" duy nhất là dễ dàng để phát âm, nhưng "lọc" kỹ thuật mô tả của quá trình này. Thường xuyên, thuật ngữ "vải lọc" được sử dụng, một phần được chính xác về mặt kỹ thuật và một phần để phân biệt các công nghệ lọc nước. Trong khi. | 23 Filtration and Baghouses INTRODUCTION Baghouse is a common term for the collection device that uses fabric bags to filter particulate out of a gas stream. The filter bags are mounted on a tubesheet and enclosed in a sheet-metal housing. The housing is visible and the single word baghouse is easy to pronounce but filtration is more technically descriptive of the process. Frequently the term fabric filtration is used partly to be technically accurate and partly to distinguish the technology from water filtration. While filtration of particles from air commonly employs fabric bags as the filter media porous ceramic candles and paper cartridges also are used to clean gas streams. Finally a fabric filter baghouse system includes the bag cleaning system dust collection hoppers and dust removal system so the total system involves more than just filtration. It must be understood that the mechanism that achieves filtration of small particles from a gas stream is not simple sieving. The spacing between fabric threads may be on the order of 50 to 75 microns yet particles of 1 micron diameter and less are collected efficiently. Indeed the primary collection mechanisms include impaction interception and diffusion as discussed in Chapter 19. Initially on a clean filter before any dust accumulates the fabric threads and fibers are stationary targets for the particles. As soon as a layer of dust dust cake accumulates however the stationary particles in the dust cake become targets for the particles in the gas stream. This explains an interesting phenomenon about fabric filtration emissions from new clean bags tend to be higher than from used bags. Used bags have been seasoned that is a number of particles have been lodged in the fabric cleaning is not perfect and there is always some residual dust after cleaning that serve as small targets for collection. These embedded particles also tend to fill the gaps between threads reducing the opening size and increasing the .
