Control of Particulate Matter Dr. Wesam Al Madhoun

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● Control of Particulate Matter

Dr. Wesam Al Madhoun
● What is Particulate Matter?
● Characteristics of Particles
● Formation Mechanisms
● Control Techniques
● Gravity Settling Chambers
● Mechanical Collectors
● Particulate Wet Scrubbers
● Venturi Scrubbers
● Impingement Plate Scrubbers
● Spray Tower Scrubbers
● Wet Scrubbing Systems
● Scrubber Operating Principles
● Collection Efficiency of Wet Scrubbers
● Advantages and Disadvantages of Scrubbers
● Electrostatic Precipitators
● Advantages and Disadvantages of ESPs
● Collection Efficiency of ESPs
● Fabric Filters
● Advantages and Disadvantages of Fabric Filters
● General Applicability of Particulate
Control Systems

نوع زبان: انگلیسی حجم: 0.66 مگا بایت
نوع فایل: اسلاید پاورپوینت تعداد اسلایدها: 63 صفحه
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گروه موضوعی: زمان استخراج مطلب: 2019/05/17 01:48:43

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., cyclone, diameter, particle, gas, large, stream, particulate, small, tube, micrometer, multus,

توجه: این مطلب در تاریخ 2019/05/17 01:48:43 به صورت خودکار از فضای وب آشکار توسط موتور جستجوی پاورپوینت جمع آوری شده است و در صورت اعلام عدم رضایت تهیه کننده ی آن، طبق قوانین سایت از روی وب گاه حذف خواهد شد. این مطلب از وب سایت زیر استخراج شده است و مسئولیت انتشار آن با منبع اصلی است.

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عبارات پرتکرار و مهم در این اسلاید عبارتند از: ., cyclone, diameter, particle, gas, large, stream, particulate, small, tube, micrometer, multus,

مشاهده محتوای متنیِ این اسلاید ppt

مشاهده محتوای متنیِ این اسلاید ppt

control of particulate matter dr. wesam al madhoun what is particulate matter particulate matter pm describes a wide variety of airborne material. pm pollution consists of materials including dust smoke and soot that are directly emitted into the air or result from the transformation of gaseous pollutants. particles come from natural sources e.g. volcanic eruptions and human activities such as burning fossil fuels incinerating wastes and smelting metals. characteristics of particles the most important characteristic of particulate matter pm is the particle size. this property has the greatest impact on the behavior of particulate matter in control equipment the atmosphere and the respiratory tract. particles of importance in air pollution control span a broad size range from extremely small . ۱ micrometer to more than ۱ micrometers. as a frame of reference a human hair has a diameter of approximately ۵ micrometers. the chemical composition of the particulate matter is also important. absorption and heterogeneous nucleation of vapor phase pollutants onto existing particles can create toxic particulate matter. other characteristics besides size and chemical composition should be considered when selecting an appropriate particulate control device for a gas stream. other important characteristics of particulate matter in gas streams include stickiness and explosiveness. formation mechanisms physical attrition occurs when two surfaces rub together. the composition and density of the particles formed are identical to the parent material and range in size from less than ۱ micrometers to almost ۱ micrometers. combustion particle burnout occurs when fuel particles are injected into the hot furnace area of a combustion process. as the combustion progresses are reduced to ash and char particles that are primarily in the ۱ to ۱ micrometer size range. homogeneous nucleation and heterogeneous nucleation involve the conversion of vapor phase materials to a particulate form. homogeneous and heterogeneous nucleation generally create particles that are very small often between .۱ and ۱. micrometer. droplet evaporation is caused by air pollution control systems that use solids containing water recycled from wet scrubbers to cool the gas streams. the water streams are atomized during injection into the hot gas streams. as these small droplets evaporate to dryness the suspended and dissolved solids are released as small particles. control techniques gravity settling chamber mechanical collectors particulate wet scrubbers electrostatic precipitators fabric filters gravity settling chambers this category of control devices relies upon gravity settling to remove particles from the gas stream. gravity settling chambers are used only for very large particles in the upper end of the supercoarse size range approximately ۷۵ micrometers and larger . the very low terminal settling velocities of most particles encountered in the field of air pollution limit the usefulness of gravity settling chambers. the stringent control requirements adopted in the late ۱۹۶ s through early ۱۹۷ s have resulted in a sharp decline in the use of this type of collector. mechanical collectors the particulate laden gas stream is forced to spin in a cyclonic manner. the mass of the particles causes them to move toward the outside of the vortex. most of the large diameter particles enter a hopper below the cyclonic tubes while the gas stream turns and exits the tube. there are two main types of mechanical collectors ۱ large diameter cyclones and ۲ small diameter multi cyclones. large diameter cyclones are usually one to six feet in diameter while small diameter multi cyclones usually have diameters between ۳ and ۱۲ inches. a typical large diameter cyclone system is shown in figure ۱. the gas stream enters the cyclone tangentially and creates a weak vortex of spinning gas in the cyclone body. large diameter particles move toward the cyclone body wall and then settle into the hopper of the cyclone. the cleaned gas turns and exits the cyclone. large diameter cyclones are used to collect particles down to ۱ ۱۶ inch ۱.۵ mm diameter and above. in systems where the large diameter cyclone is located after the fan positive pressure the treated gas is usually discharged directly from the cyclone. in systems where the cyclone is located before the fan negative pressure the gas stream is either exhausted from a separate stack or from the discharge of the fan itself. in negative pressure systems a solids discharge valve is used to prevent air infiltration up through the hopper area. a small diameter cyclone tube is shown in figure ۲. vanes located on the inlet of each of the tubes create the spinning movement of the gas stream. most of the commercial tubes are six nine or twelve inches in diameter. due to the limited gas handling capacity of each tube large numbers of tubes are mounted in parallel in a single collector. the small diameter of the cyclone tube creates more rapid spinning of the gas stream than in large diameter cyclones. the particles moving outward in the spinning gas stream have a relatively shorter distance to travel in a small diameter multi cyclone tube before they reach the cyclone body wall. these features allow small diameter multi cyclones to collect considerably smaller particles than large diameter cyclones can. small diameter multi cyclones such as the one shown in figure ۲ are capable of removing particles having diameters down to ۵ micrometers. small diameter multi cyclones are not generally used for very large diameter material such as ۳ mm and above because large particles may plug the spinner vanes in the multi cyclone tubes. some mechanical collectors are specially designed to provide high efficiency pm collection down to a particle size of one micrometer. these have higher gas velocities within the cyclone tubes and different cyclone geometries than those shown in figure ۲. a typical application of a conventional multi cyclone collector is shown in figure ۳. in this example the multi cyclone is …

کلمات کلیدی پرکاربرد در این اسلاید پاورپوینت: ., cyclone, diameter, particle, gas, large, stream, particulate, small, tube, micrometer, multus,

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