tailieunhanh - AIR POLLUTION CONTROL EQUIPMENT SELECTION GUIDE - CHAPTER 6

Bay hơi làm mát khí sử dụng các ứng dụng kiểm soát của một chất lỏng (thường là nước) với một dòng khí nóng để giảm nhiệt độ của dòng khí đó thông qua sự bay hơi của chất lỏng. Chất lỏng thường được áp dụng trong hình thức một không khí phun sương mù hoặc sương mù. Điển hình ứng dụng và sử dụng Thiết bị làm mát bay hơi được thiết kế để giảm nhiệt độ dòng khí nóng đến một mức độ phù hợp để điều trị thêm. Họ cũng được sử dụng để "điều kiện" hạt trước khi. | chapter 6 Evaporative coolers Device type Evaporative gas coolers use the controlled application of a liquid usually water to a hot gas stream to reduce that gas stream s temperature through the evaporation of that liquid. The liquid is often applied in the form of an air atomized mist or fog. Typical applications and uses Evaporative coolers are designed to reduce a hot gas stream s temperature to a level suitable for further treatment. They are also used to condition the particulate before capture in another device. When a gas stream requires treatment by a device that is sensitive to gas temperatures as well as gas humidity such as a fabric filter collector an evaporative gas cooler is often used to reduce the gas stream temperature to a tolerable level above the saturation temperature. Through the careful application of the liquid the outlet temperature can be reduced yet the bulk stream quality can be maintained safely above the water saturation temperature and or acid dewpoint. The evaporative gas cooler is sometimes also used ahead of devices such as electrostatic precipitators or spray dryers to temper or condition the gas stream before particulate separation or gas absorption onto a sorbent. For boiler applications the addition of moisture often favorably reduces the resistivity of the fly ash. Evaporative coolers are often used as the first stage of a gas cleaning system on hot gas applications such as thermal oxidizers incinerators furnaces calciners and kilns. Figure shows an evaporative cooler to the right ahead of a pulse type baghouse equipped with dry lime injection on a medical waste incinerator. The evaporative cooler reduces the flue gas This chapter is contributed by Wayne T. Hartshorn Hart Environmental Inc. Lehighton Pennsylvania. 2002 by CRC Press LLC Figure Evaporative cooler on pulse type baghouse Bundy Environmental Technology . temperature to less than 500 F to protect the filter media in the collector and to reduce the treated .