Modifying Char Dustcake Pressure Drop Using Particulate Additives Page: 1 of 15
This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to UNT Digital Library by the UNT Libraries Government Documents Department.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
Carl Landham (Primary Contact)
Southern Research Institute
P.O. Box 1069
Wilsonville, AL 35186
eclandha@southernco.com
205-670-5990 Voice
205-670-5916 Fax
Ruth Ann Martin
Southern Company Services, Inc.
P.O. Box 1069
Wilsonville, AL 35186
rumartin@southernco.com
205-670-5088 Voice
205-670-5843 FaxRobert S. Dahlin
Southern Research Institute
P.O. Box 1069
Wilsonville, AL 35186
rsdahlin@southernco.com
205-670-5068 Voice
205-670-5916 Fax
Xiaofeng Guan
Southern Company Services, Inc.
P.O. Box 1069
Wilsonville, AL 35186
xguan@southernco.com
205-670-5891 Voice
205-670-5843 FaxModifying Char Dustcake Pressure Drop Using Particulate Additives
Keywords: Dustcake, Pressure Drop, Char, Additives
Introduction
Coal gasification produces residual particles of coal char, coal ash, and sorbent that are
suspended in the fuel gas stream exiting the gasifier. In most cases, these particles (referred to,
hereafter, simply as char) must be removed from the stream prior to sending the gas to a turbine,
fuel cell, or other downstream device. Currently, the most common approach to cleaning the gas
stream at high temperature and pressure is by filtering the particulate with a porous ceramic or
metal filter. However, because these dusts frequently have small size distributions, irregular
morphology, and high specific surface areas, they can have very high gas flow resistance
resulting in hot-gas filter system operating problems.
Typical of gasification chars, the hot-gas filter dustcakes produced at the Power Systems
Development Facility (PSDF) during recent coal gasification tests have had very high flow
resistance (Martin et al, 2002). The filter system has been able to successfully operate, but
pressure drops have been high and filter cleaning must occur very frequently. In anticipation of
this problem, a study was conducted to investigate ways of reducing dustcake pressure drop.
This paper will discuss the efficacy of adding low-flow-resistance particulate matter to the high-
flow-resistance char dustcake to reduce dustcake pressure drop. The study had two parts: a
laboratory screening study and confirming field measurements at the PSDF.
The pressure drop across a particulate dustcake is a function of the morphology of the particles in
the cake, the particle size distribution, the dustcake porosity, and the dustcake areal loading.
Adding particles that have benign morphology or size or that produce more porous dustcakes
could be useful in reducing the overall flow resistance of a dust mixture. However, there are a
number of potential problems with this approach:
* It can be difficult to maintain a constant rate of additive injection and to achieve uniform
dispersion of the additive particles within the gas stream.1
Upcoming Pages
Here’s what’s next.
Search Inside
This article can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Article.
Landham, C.; Dahlin, R.S.; Martin, R.A. & Guan, X. Modifying Char Dustcake Pressure Drop Using Particulate Additives, article, September 19, 2002; United States. (https://digital.library.unt.edu/ark:/67531/metadc784702/m1/1/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.