tailieunhanh - AIR POLLUTION CONTROL EQUIPMENT SELECTION GUIDE - CHAPTER 17

chương 17 khay lọc khí thiết bị loại Cọ rửa khay lọc khí ẩm ướt có sử dụng một khay hoặc khay chứa nhiều các khe hở mà qua đó khí là tăng tốc sau đó trộn với chất lỏng chà kỹ, loại bỏ hạt do đó nâng cao và hấp thụ khí. Điển hình ứng dụng và sử dụng Khay lọc khí được sử dụng cho việc kiểm soát hạt lớn hơn khoảng 10 mm tại trội ít hơn 1 đến 2 GRS / dscf và hấp thụ các khí hòa tan. Họ cũng thường được sử dụng để làm mát các dòng khí. | chapter 17 Tray scrubbers Device type Tray scrubbers are wet scrubbers that use a tray or multiple trays containing openings through which gas is accelerated to subsequently mix with scrubbing liquid thereby enhancing particulate removal and gas absorption. Typical applications and uses Tray scrubbers are used for the control of particulate greater than approximately 10 pm at loadings less than 1 to 2 grs dscf and to absorb soluble gases. They are also often used for cooling gas streams and to subcool gases. In years before the Clean Air Act 1970 tray scrubbers were used to control the emissions from lime kilns lime sludge kilns boilers tanker inert gas systems sludge incinerators and similar applications where particulate and soluble gases usually acidic gases must be removed simultaneously. As the air pollution control regulations tightened higher efficiency wet devices such as Venturi scrubbers and dry devices such as baghouses became more popular. Tray scrubbers continue to be used as gas cleaning and conditioning devices often in concert with other devices. Tray scrubbers are not used where large diameter particulate may plug the openings in the trays. They are also avoided where the loading of dust is high above 2 grs dscf for the same reason. You often see tray scrubbers successfully used after primary particulate devices. For example they are used for gas cooling and plume suppression after Venturi scrubbers on municipal sludge incinerators and after baghouses to remove SO2 and HCl from waste incinerators. Operating principles Tray scrubbers use one or more punched perforated drilled or woven trays usually flat over which scrubbing liquid is passed. Gases containing particulate and absorbable gases are passed through these openings wherein 2002 by CRC Press LLC Figure Impingement tray scrubber Sly Inc. . the gas is accelerated increasing its kinetic energy. The gas impacts into this liquid passing over the tray and in doing so transfers its energy into