Catalytic
Filter is More and More Attractive for Power and Cement - Hot Topic Hour
Yesterday
Could the catalytic filter take the same path as pulse jet filters did three decades ago? At the time, the common belief was that no utility was going to install 10,000 bags. Today pulse jet technology is much more popular than reverse air. Furthermore, it is very likely that filters of one type or another will supplant precipitators in the U.S. and Chinese power plants.
The Hot Topic Hour yesterday further validated that hot gas
filters can be used on some tough and abrasive applications. Furthermore,
companies such as Pentair (Goyen)
have the ability to custom design the pulse cleaning system to assure reliable
operation. George Moeke of Pentair
described the successful installation of a pulse jet cleaning system in
Australia. PTFE bags were failing within weeks. Ceramic elements with a
tailored cleaning system provided reliable operation. Richard
Lydon of Filtration Group
then explained that
the average
life of the Cerafil GR 3000 filter candles is 5-6 years.
The various cost and performance aspects were then reviewed. For a retrofit installation the cost for a fabric filter and SCR can exceed $200/kW. For existing hot precipitator installations, the catalytic filter could be installed by possibly using the hot precipitator shell or support structure.
The hot clean
850°F gas can then pass through a rotary heat exchanger with tight seals and
less than five percent leakage. The 350°F exit gas can then pass through a
condensing heat exchanger and enter a Gore module for mercury removal at
150°F. An example of rapid payback with a CHX heat exchanger was presented.
There are a
number of older power plants in the U.S. which could potentially benefit greatly
from this technology. Tri-Mer has engaged EERC to evaluate the application
on various coals. The incorporation of dry sorbent injection is not likely to
add greatly to the pressure drop. The reason is that the large calcium sulphate
particles are easily removed from the filter surface. The catalyst for the
NOx is protected from the dirty gas due to its location on the clean
side of the filter medium.
The Pentair (Goyen)
presentation is found at
George described the successful installation of a pulse jet cleaning system in Australia.
Revision Date: 9/5/2014
Tags: 221112 - Fossil Fuel 化石燃料, Pentair, Pulse Jet, Valve
The Webinar
slides are found at
http://www.mcilvainecompany.com/HotGasAnalysis/Subscriber/Default.htm
The free
website is http://www.mcilvainecompany.com/HotGasAnalysis/Subscriber/Default.htm