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Title: Cyclone performance and optimization

Abstract

The objectives of this project are: to characterize the gas flow pattern within cyclones, to revise the theory for cyclone performance on the basis of these findings, and to design and test cyclones whose dimensions have been optimized using revised performance theory. This work is important because its successful completion will aid in the technology for combustion of coal in pressurized, fluidized beds. During the past quarter, we have nearly completed modeling work that employs the flow field measurements made during the past six months. In addition, we have begun final work using the results of this project to develop improved design methods for cyclones. This work involves optimization using the Iozia-Leith efficiency model and the Dirgo pressure drop model. This work will be completed this summer. 9 figs.

Authors:
Publication Date:
Research Org.:
North Carolina Univ., Chapel Hill, NC (USA). Dept. of Environmental Sciences and Engineering
Sponsoring Org.:
USDOE; USDOE, Washington, DC (USA)
OSTI Identifier:
5630999
Report Number(s):
DOE/PC/79922-T14
ON: DE91015242
DOE Contract Number:
FG22-87PC79922
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 20 FOSSIL-FUELED POWER PLANTS; 54 ENVIRONMENTAL SCIENCES; CYCLONE SEPARATORS; GAS FLOW; AIR POLLUTION CONTROL; BUBBLES; COAL; FLUIDIZED-BED COMBUSTION; PROGRESS REPORT; TURBULENCE; VELOCITY; CARBONACEOUS MATERIALS; CHEMICAL REACTIONS; COMBUSTION; CONCENTRATORS; CONTROL; DOCUMENT TYPES; ENERGY SOURCES; EQUIPMENT; FLUID FLOW; FOSSIL FUELS; FUELS; INERTIAL SEPARATORS; MATERIALS; OXIDATION; POLLUTION CONTROL; POLLUTION CONTROL EQUIPMENT; SEPARATION EQUIPMENT; THERMOCHEMICAL PROCESSES; 010800* - Coal, Lignite, & Peat- Waste Management; 200202 - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions; 540120 - Environment, Atmospheric- Chemicals Monitoring & Transport- (1990-)

Citation Formats

Leith, D. Cyclone performance and optimization. United States: N. p., 1990. Web.
Leith, D. Cyclone performance and optimization. United States.
Leith, D. 1990. "Cyclone performance and optimization". United States. doi:.
@article{osti_5630999,
title = {Cyclone performance and optimization},
author = {Leith, D.},
abstractNote = {The objectives of this project are: to characterize the gas flow pattern within cyclones, to revise the theory for cyclone performance on the basis of these findings, and to design and test cyclones whose dimensions have been optimized using revised performance theory. This work is important because its successful completion will aid in the technology for combustion of coal in pressurized, fluidized beds. During the past quarter, we have nearly completed modeling work that employs the flow field measurements made during the past six months. In addition, we have begun final work using the results of this project to develop improved design methods for cyclones. This work involves optimization using the Iozia-Leith efficiency model and the Dirgo pressure drop model. This work will be completed this summer. 9 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1990,
month = 6
}

Technical Report:
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  • The objectives of this project are: to characterize the gas flow pattern within cyclones, to revise the theory for cyclone performance on the basis of these findings, and to design and test cyclones whose dimensions have been optimized using revised performance theory. This work is impoortant because its successful completion will aid in the technology for combustion of coal in pressurized, fluidized beds. The project is on or ahead of schedule. During this time, the laboratory scale equipment necessary for this project has been constructed and used to make measurements of the gas flow pattern within cyclones. Tangential gas velocitiesmore » for a matrix of eleven different cuclones and operating conditions have been measured. For each different test condition tangential velocities over a wide range of axial and radial positions have been measured. In addition, the literature search that began while the proposal for this work was written has been continued. The computer and printer necessary for modeling the experimental results have been ordered and received. 1 fig.« less
  • The objectives of this project are: to characterize the gas flow pattern within cyclones, to revise the theory for cyclone performance on the basis of these findings, and to design and test cyclones whose dimensions have been optimized using revised performance theory. This work is important because its successful completion will aid in the technology for combustion of coal in pressurized, fluidized beds. This quarter, we have mapped out additional strategies for determining gas flow pattern within cyclones. To measure gas velocities more accurately than has been possible until now, we plan to use a device that generates bubbles withmore » density equal to that of air (the SAI Bubble Generation System). We have now ordered the bubble generation system, and are awaiting delivery. Meanwhile, we have planned the experiments we will run when the system arrives. This planning includes writing computer code to process the data generated. We have also been working on flow visualization methods to identify the cyclone natural length. Several techniques have been used, including smoke generation and flexible tracers. Continuing work on this point is under way.« less
  • The objectives of this project are: to characterize the gas flow pattern within cyclones, to revise the theory for cyclone performance on the basis of these findings, and to design and test cyclones whose dimensions have been optimized using revised performance theory. This work is important because its successful completion will aid in the technology for combustion of coal in pressurized, fluidized beds. During the fall, we have made progress toward modeling the gas flow in a cyclone, based on experimental measurements made during the past summer. Details of the model under development are described below.
  • The objectives of this project are: to characterize the gas flow pattern within cyclones, to revise the theory for cyclone performance on the basis of these findings, and to design and test cyclones whose dimensions have been optimized using revised performance theory. This work is important because it successful completion will aid in the technology for combustion of coal in pressurized, fluidized beds. During the past quarter, we have (1) significantly strengthened our data set for radial and tangential velocities through the cyclone, (2) developed a technique to filter noise from the radial velocity measurements, (3) modified our Model programmore » so that we can now use our flow field measurements to predict cyclone collection efficiency for particles of various sizes. 3 figs.« less
  • The objectives of this project are: to characterize the gas flow pattern within cyclones, to revise the theory for cyclone performance on the basis of these findings, and to design and test cyclones whose dimensions have been optimized using revised performance theory. This work is important because its successful completion will aid in the technology for combustion of coal in pressurized, fluidized beds. This quarter, we have been hampered somewhat by flow delivery of the bubble generation system and arc lighting system placed on order last fall. This equipment is necessary to map the flow field within cyclones using themore » techniques described in last quarter's report. Using the bubble generator, we completed this quarter a study of the natural length'' of cyclones of 18 different configurations, each configuration operated at five different gas flows. Results suggest that the equation by Alexander for natural length is incorrect; natural length as measured with the bubble generation system is always below the bottom of the cyclones regardless of the cyclone configuration or gas flow, within the limits of the experimental cyclones tested. This finding is important because natural length is a term in equations used to predict cyclone efficiency. 1 tab.« less