Inventors:
Song Wu - Livingston NJ, US
Takanori Nakamoto - Kurc, JP
Takashi Muramoto - Kurc, JP
Udo Zirn - Morristown NJ, US
Toshio Katsube - Kurc, JP
Hirofumi Kikkawa - Hiroshima, JP
Assignee:
Hitachi Power Systems America, Ltd. - Basking Ridge NJ
International Classification:
B01D 53/06
B01D 53/50
Abstract:
Methods and apparatus for pollution control which are well suited for use in a coal power plant are described. Ash is collected and injected into the flue gas stream at a location upstream of a cooling module. The ash acts as an absorbent and/or reactant material onto which condensate may condense. By re-introducing ash to keep the condensation forming wet areas within the system, lower cost materials which are less corrosion resistant than needed for wet operating conditions can be used. Mercury recovery and SO3 removal is facilitated by the cooling process and re-introduction of collected ash. Activated carbon and/or an alkali absorbent material may be added. Use of a dry ESP and/or fabric filter as opposed to a wet ESP for particulate collection leads to cost benefits. Energy recovered by the cooling of the flue gas may be re-used to heat turbine condensate leading to improved energy efficiency.
