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Improving Collection Efficiency of a Cyclone Collector to Capture Finer Particles by Adding a Post Cyclone Collector with Minimized Pressure Drop

IP.com Disclosure Number: IPCOM000202035D
Original Publication Date: 2010-Dec-02
Included in the Prior Art Database: 2010-Dec-02
Document File: 3 page(s) / 191K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

Cyclonic separation is a method of removing particulates from an air, gas or water stream without using filters, solely through vortex separation. Rotational effects and gravity are used to separate mixtures of solids and fluids. Cyclone separators are widely used in industry applications such as coal and biomass gasification, in the cement industry and in pollution control systems of various process plants. Cyclone separators are especially well suited to remove particulates from a gas. The particulate size to be separated is limited due to the particles inertia when following the gas path within the separator. Consequently, the cyclone is not very efficient in separating smaller particles, as the particles tend to follow the gas flow path and hence get carried along. The cyclone separators efficiency can be improved by optimizing its geometrical parameters but only with a significant pressure loss. However, to separate smaller particles, several other state of the art filtration techniques are known for e.g. fabric filters; sintered metal filters and wet scrubbers. But these techniques lead to a significiant pressure drop in the process which is usually disadvantageous. Furthermore, an auxiliary device, the so called Post Cyclone collector (PoC) is used. The PoC is a cylindrical annular shell located on the exit (mostly the top) of a conventional Cyclone separator, which is capable of separating smaller particles than the upstream cyclone. The separation of particles in the PoC mainly occurs due to the centrifugal forces on the particles in the tangential velocity field. The separated particles are carried along with a bleed flow, where they are separated by using additional filtering techniques. The gas stream is subsequently re-mixed with the main stream. The described approach is disadvantageous because an additional filtration device is required which separates particles from the bleed stream. In particular, the device causes also pressure drop and requires regular maintenance.

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Improving Collection Efficiency of a Cyclone Collector to Capture Finer Particles by Adding a Post Cyclone Collector with Minimized Pressure Drop

Idea: Chandrashekar Joshi, IN-Bangalore

Cyclonic separation is a method of removing particulates from an air, gas or water stream without using filters, solely through vortex separation. Rotational effects and gravity are used to separate mixtures of solids and fluids. Cyclone separators are widely used in industry applications such as coal and biomass gasification, in the cement industry and in pollution control systems of various process plants. Cyclone separators are especially well suited to remove particulates from a gas. The particulate size to be separated is limited due to the particles inertia when following the gas path within the separator. Consequently, the cyclone is not very efficient in separating smaller particles, as the particles tend to follow the gas flow path and hence get carried along. The cyclone separators efficiency can be improved by optimizing its geometrical parameters but only with a significant pressure loss. However, to separate smaller particles, several other state of the art filtration techniques are known for e.g. fabric filters; sintered metal filters and wet scrubbers. But these techniques lead to a significiant pressure drop in the process which is usually disadvantageous. Furthermore, an auxiliary device, the so called Post Cyclone collector (PoC) is used. The PoC is a cylindrical annular shell located on the exit (mostly the top) of a conventional Cyclone separator, which is capable of separating smaller particles than the upstream cyclone. The separation of particles in the PoC mainly occurs due to the centrifugal forces on the particles in the tangential velocity field. The separated particles are carried along with a bleed flow, where they are separated by using additional filtering techniques. The gas stream is subsequently re-mixed with the main stream. The described approach is disadvantageous because an additional filtration device is required which separates particles from the bleed stream. In particular, the device causes also pressure drop and requires regular maintenance.

In the following, a novel conical shaped design for a post cyclone collector is presented (see Figure 1). The proposed design improves the collection efficiency by capturing smaller particles escaping the upstream cyclone. In the proposed PoC, smaller particles escaping the cyclone along the crossflow without even reaching the bottom of the cyclone are collected by providing a surface where these small particles are depositing because of sharp changes in flow direction an...