Gas separation – Multiple separators – each with discrete and longitudinally... – Centrifugal
Reexamination Certificate
2000-03-02
2001-08-07
Simmons, David A. (Department: 1724)
Gas separation
Multiple separators, each with discrete and longitudinally...
Centrifugal
C055S459100
Reexamination Certificate
active
06270545
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a multiple-stage cyclone including a double-stage cyclone and a triple-stage cyclone, which is used for measuring or controlling an amount of suspended dust contained in air.
2. Description of the Related Art
Generally, particulate substances (suspended dust) are considered as a major element which causes air pollution, and are generated naturally or artificially. Most of natural particulate substances have a size which is no less than 2.5 &mgr;m, and are mainly generated through a mechanical crushing procedure of soil-originated dust and saline particles which are produced by action of the wind. On the contrary, artificial suspended dust is composed of particles having a size which is substantially no greater than 2.5 &mgr;m, and are mainly generated by chemical combustion of a matter, vehicle exhaust gas and a manufacturing procedure of a chemical material. Particulate substances can also be generated from gaseous substances. Each of the gaseous substances grows from a size of a molecule to a size of a fine particle while experiencing condensation and agglomeration procedures. These gaseous substances not only are increased in their sizes, but also include noxious sulfur dioxide gas and volatile organic compound (VOC) thereby to exert detrimental effects to the human body. Particles discharged from a pollution source have diverse sizes, and a noxiousness degree against the human body varies depending upon a size distribution of the particles and a chemical composition of the particles.
Currently, as an apparatus for controlling an amount of suspended dust, that is, particles, an impactor, a cyclone, a wet scrubber, a filter dust collector or an electrostatic precipitator has been widely used. Also, as a method for measuring an amount of suspended dust, a method which utilizes a principle of an impactor, a cyclone, a diffusion battery, an aerodynamic particle sizer or a differential mobility particle sizer, has been widely used.
Among the above-mentioned apparatuses for controlling an amount of suspended dust, the cyclone exerts centrifugal force to particles while swirling gas which contains suspended dust, and, with the aid of the centrifugal force, the particles are separately collected. Specifically, because the cyclone can be easily designed and fabricated and convenience can be ensured upon using the cyclone, the cyclone is broadly used in a field which is associated with measuring of a particle size and controlling an amount of suspended dust. While the cyclone has been mainly used for controlling deleterious particles which are included in exhaust gas, the cyclone can be used as a preprocessing apparatus of an electrostatic precipitator or a filter dust collector, or can be separately used.
SUMMARY OF THE INVENTION
Accordingly, the present invention has been made in an effort to solve the problems occurring in the related art, and an object of the present invention is to provide a multiple-stage cyclone including a double-stage cyclone and a triple-stage cyclone, which is designed to enable particles contained in air to be collected in a multi-stepwise manner while the air passes through a plurality of cylindrical spaces defined inside an outer cylindrical body.
In order to achieve the above object, according to the present invention, there is provided a multiple-stage cyclone suitable for measuring and controlling an amount of suspended dust, comprising: an outer cylindrical body having an upper end which is closed by an upper plate and a lower portion which is formed as a downward converging pipe, the outer cylindrical body possessing an air inlet which is defined on a circumferential outer surface thereof adjoining the upper end; a first inner cylindrical body secured to an inner surface of the upper plate and having an upper portion which is formed as an upward converging pipe, the first inner cylindrical body being arranged inside the outer cylindrical body in a manner such that a first cylindrical space exists therebetween; a plurality of second inner cylindrical bodies alternately secured to the inner surface of the upper plate and the downward converging pipe in a manner such that an upper portion or a lower portion of one second inner cylindrical body is inserted into another second inner cylindrical body while one of a plurality of second cylindrical spaces exists therebetween; and a discharge pipe having an upper portion or a lower portion which is inserted into an innermost second inner cylindrical body in a manner such that a third cylindrical space exists therebetween and an upper end or a lower end which is fastened to the upper plate or the downward converging pipe, the discharge pipe defining an air outlet.
By the features of the present invention, since a high dust-control efficiency can be achieved in a narrow area, not only economy is improved, but also it is possible to prevent an electrostatic precipitator or a filter dust collector from being overly loaded, which is otherwise likely to occur due to the fact that an efficiency of a preprocessing apparatus is low. Also, because fine particles can be effectively collected, the multi-stage cyclone according to the present invention can be widely used in a field which is associated with industrial health or dust treatment engineering.
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Kim Min Cheol
Kuhlman Michael R.
Lee Ken Won
Park Young Ok
Zhu Yifang
Kwangju Institute of Science and Technology
Lawrence Frank M.
Martine & Penilla LLP
Simmons David A.
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