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Title: Unconventional cyclone separators

Abstract

Conventional cyclone separators are seldom suitable for dust removal from gases according to present standards. The reason is the presence of secondary currents within the cyclone body, which disturb the process of separation as predicted by elementary cyclone theory. Interference can be avoided by special design of the cyclone, including the geometry of the separation chamber, the position of openings, use of flow guides within the cyclone, the dimension and the geometry of the hopper, bleeding and bypassing of the gas, use of multicyclones, and means for dust agglomeration.

Authors:
 [1]
  1. (Univ. GH-Essen (Germany))
Publication Date:
OSTI Identifier:
6432912
Resource Type:
Journal Article
Resource Relation:
Journal Name: International Chemical Engineering (A Quarterly Journal of Translations from Russia, Eastern Europe and Asia); (United States); Journal Volume: 33:1
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 01 COAL, LIGNITE, AND PEAT; CYCLONE SEPARATORS; DESIGN; GASES; DEASHING; AGGLOMERATION; AIR POLLUTION CONTROL; DUSTS; FLOW REGULATORS; POLLUTION CONTROL EQUIPMENT; REMOVAL; CONCENTRATORS; CONTROL; CONTROL EQUIPMENT; EQUIPMENT; FLUIDS; INERTIAL SEPARATORS; POLLUTION CONTROL; SEPARATION EQUIPMENT 540120* -- Environment, Atmospheric-- Chemicals Monitoring & Transport-- (1990-); 010800 -- Coal, Lignite, & Peat-- Waste Management

Citation Formats

Schmidt, P. Unconventional cyclone separators. United States: N. p., 1993. Web.
Schmidt, P. Unconventional cyclone separators. United States.
Schmidt, P. 1993. "Unconventional cyclone separators". United States. doi:.
@article{osti_6432912,
title = {Unconventional cyclone separators},
author = {Schmidt, P.},
abstractNote = {Conventional cyclone separators are seldom suitable for dust removal from gases according to present standards. The reason is the presence of secondary currents within the cyclone body, which disturb the process of separation as predicted by elementary cyclone theory. Interference can be avoided by special design of the cyclone, including the geometry of the separation chamber, the position of openings, use of flow guides within the cyclone, the dimension and the geometry of the hopper, bleeding and bypassing of the gas, use of multicyclones, and means for dust agglomeration.},
doi = {},
journal = {International Chemical Engineering (A Quarterly Journal of Translations from Russia, Eastern Europe and Asia); (United States)},
number = ,
volume = 33:1,
place = {United States},
year = 1993,
month = 1
}
  • Full-scale performance tests of four types of gas-liquid separators are reported. They have indicated that a cyclone-type separator can have a catch-efficiency rate which approaches 100%. The tests were prompted by recurring condensate formation in a gastransmission system. Preliminary findings indicate that the condensate troubles resulted on several occasions from separators which failed to meet manufacturers' performance specifications on catch efficiency under operating conditions.
  • Besides a continuous increase of the worldwide use of electricity, the electric energy storage technology market is a growing sector. At the latest since the German energy transition ('Energiewende') was announced, technological solutions for the storage of renewable energy have been intensively studied. Storage technologies in various forms are commercially available. A widespread technology is the electrochemical cell. Here the cost per kWh, e. g. determined by energy density, production process and cycle life, is of main interest. Commonly, an electrochemical cell consists of an anode and a cathode that are separated by an ion permeable or ion conductive membranemore » - the separator - as one of the main components. Many applications use polymeric separators whose pores are filled with liquid electrolyte, providing high power densities. However, problems arise from different failure mechanisms during cell operation, which can affect the integrity and functionality of these separators. In the case of excessive heating or mechanical damage, the polymeric separators become an incalculable security risk. Furthermore, the growth of metallic dendrites between the electrodes leads to unwanted short circuits. In order to minimize these risks, temperature stable and non-flammable ceramic particles can be added, forming so-called composite separators. Full ceramic separators, in turn, are currently commercially used only for high-temperature operation systems, due to their comparably low ion conductivity at room temperature. However, as security and lifetime demands increase, these materials turn into focus also for future room temperature applications. Hence, growing research effort is being spent on the improvement of the ion conductivity of these ceramic solid electrolyte materials, acting as separator and electrolyte at the same time. Starting with a short overview of available separator technologies and the separator market, this review focuses on ceramic-based separators. Two prominent examples, the lithium-ion and sodium-sulfur battery, are described to show the current stage of development. New routes are presented as promising technologies for safe and long-life electrochemical storage cells.« less
  • The reasons for the development of the new concurrent conical cyclone of the NVGK type and its main dimensions are given. Results of comparative tests of models NVGK and TsN-15 cyclones 250 mm in diameter are presented. It is shown that for identical gas velocities and flow rates the efficiency of the NVGK cyclone is higher and its hydraulic resistance is lower than for the TsN-15. It was established that cocurrent conical cyclones also have advantages with regard to installation in dust-trapping systems, particularly in the capacity of a second supplemental stage of dry centrifugal gas purification in existing plants.