CYCLONE

Topics: Air pollution, Tropical cyclone, Dust Pages: 8 (1764 words) Published: April 27, 2015

AIR POLLUTION CONTROL TECHNOLOGY (CEB 30403)

TITLE OF EXPERIMENT

PARTICULATE EMISSION CONTROL BY DOUBLE CYCLONE SYSTEM

NAME : THEYVAN A/L GANESAN

ID : 55201212141

LECTURER : DR. AMELIA

DATE OF EXPERIMENT : 9 MARCH 2015

1.0 INTRODUCTION

This experiment was conducted to study the effect of cyclone body diameter upon collection efficiency. The cyclonic separator is an important and popular type of dust-removal equipment. In this experiment 50 gram of kaolin was used as sample to study the particulate collection efficiency of double cyclone system.

A cyclone collector can be defined as a structure without moving parts in which the velocity of an inlet gas stream is transformed into a confined vortex from which centrifugal forces tend to drive the suspended particles to the wall of of the cyclone body. It consists of vertically placed cylinders which has an inverted cone attached to its base. The particulate-laden gas stream enters tangentially at the inlet point into the cylinder. The outlet pipe for the purified gas is a central cylindrical opening at the top. The dust particulates are collected at the bottom in a storage hopper. The gas path generally follows a double vortex (Tse Hung,2012). The gas is first allowed to flow through a light circular spiral which produces centrifugal force on the suspended particles which in turn are forced to move upwards at the central portion of the cyclone. Because of inertia, the dust particles tend to settle on the surface of the cyclone wall, from where they are collected in receivers (Sharma,2007). Figure 1.0 : Cyclone Separator

(Source : Tse Hung, 2012 Handbook of Environment and Waste Management, pp.13)

The collection efficiency of cyclones varies as a function of particle size and cyclone design. Cyclones are generally sized from the diameter of the cylinder (Mudakavi,2010). Cyclone efficiency generally increases with particle size and/or density, inlet duct velocity, cyclone body length, number of gas revolutions in the cyclone, ration of cyclone body diameter to gas exit diameter, dust loading, and smoothness of the cyclone inner wall. Cyclone efficiency will decrease with increases in gas velocity, body diameter, gas exit diameter, gas inlet duct area, and gas density. A common factor contributing to decreased control efficiencies in cyclones is leakage of air into the dust outlet (Cheremisinoff,2002).

Under ideal operating conditions, the smaller diameter cyclone system can attain 80 % collection efficiency. The larger diameter cyclone systems are usually free of plugging, and can achieve efficiencies up to about 70 %. Very large diameter cyclone untis are rarely used because of their relatively low collection efficiency (Arthur,1977).

There are three important operating problems associated with cyclones. They are erosion, corrosion, and material build-up. Cyclones consists of some advantages. It have low initial cost, low pressure drop, has no moving parts, low maintenance requirements, and so on. As for disadvantages it have low collection efficiency for particles below 5-10 in diameter, deteriorate due to abrasive and decreasing dispersoid concentrations in the gas stream (Tse Hung, 2012).

2.0 OBJECTIVE

This experiment was conducted to achieve the following objectives :

To study the effect of cyclone body diameter upon collection efficiency. To study the operating principle of double cyclone system.
To study the ability of double cyclone system in removing pollutants.

3.0 METHODOLOGY

No.
Descriptions
1
The experiment was prepared for 200 mm cyclone operation.

2
The empty feed container and dust hopper was weighed separately.

3
50g of kaolin was weighed and poured slowly into the feed container.

4
The air pump was connected to the feed container with the tubing provided and the needle valve was initially...
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