tailieunhanh - AIR POLLUTION CONTROL EQUIPMENT SELECTION GUIDE - CHAPTER 14

Tháp phun / máy lọc thiết bị loại Phun tháp lọc khí sử dụng vòi phun để mở rộng diện tích bề mặt của chất lỏng chà kỹ để tăng cường chuyển giao khối lượng của chất gây ô nhiễm khí (es) thành chất lỏng. Họ chủ yếu được sử dụng cho sự hấp thụ khí. Lọc khí phun bao gồm thiết kế sử dụng vòi phun (bằng thủy lực hoặc khí hoặc hơi nước phun) để hấp thụ các khí và hạt kiểm soát | chapter 14 Spray towers scrubbers Device type Spray tower scrubbers use spray nozzles to extend the surface area of the scrubbing liquid to enhance mass transfer of contaminant gas es into the liquid. They are primarily used for gas absorption. Spray scrubbers include designs that use spray nozzles hydraulically or air or steam atomized to absorb gases and control particulate. Typical applications and uses Spray tower scrubbers are often used on wet flue gas desulfurization FGD systems at public and industrial power generation facilities. These FGD systems use lime or limestone slurries as the scrubbing liquid. Their open vessel design is an advantage where plugging or scaling may occur. The simplicity of the design makes them a lower cost alternate for high gas volume scrubbing applications over 100 000 acfm . They are also used as part of quenching and gas conditioning systems wherein the gas must be brought to saturation or near saturation with water. Most spray towers are countercurrent in design wherein the gas flows vertically upward and the liquid falls downward through the ascending gases. Some units used for odor control are horizontally oriented using a multiplicity of concurrent spray sections in series. Spray scrubbers cover a wider variety of designs. These vary from devices as simple as a spray header in a duct to cyclonic type devices often called preformed spray scrubbers . Operating principles A common characteristic of this type scrubber is the use of spray nozzles to extend the liquid surface and produce target droplets. At least one spray zone is produced in a spray tower using at least one spray nozzle in a containing vessel. In practice however most spray towers 2002 by CRC Press LLC SPRAY TOWER Figure Spray tower sectional view. use multiple spray zones to achieve the required gas cleaning efficiency. Figure shows a sectional view of a spray tower. The gas inlet is typically horizontally oriented into the containing vessel. A .