Babcock-Hitachi Kabushiki Kaisha

Takayuki Saitou

Takanori Nakamoto

Toshio Katsube

Kouji Muramoto

Hiromichi Shimazu

Hirofumi Kikkawa

Hiroshi Ishizaka

Jun Shimamura

Hiroyuki Nosaka

Yoshinori Taguchi

A system is provided that prevents inhibition of adsorption of Hg and other heavy metals by activated carbon or other heavy metal adsorbent due to prior adsorption of sulfur trioxide (SO) in an exhaust gas containing SO. As it has been found that while SOis adsorbed, the adsorption of SOprecedes the adsorption of Hg and other heavy metals onto activated carbon, a basic substance injection system is disposed along an exhaust gas flow channel at an upstream side of an activated carbon injection system, thereby attaining effective removal of Hg and other heavy metals from the exhaust gas by adsorption thereof onto surface pores of the activated carbon. The SOconcentration after removal by basic substance conversion is computed from the SOconcentration before removal, and the activated carbon injection rate can be controlled based on the concentration after removal.

Exhaust gas purifying method and apparatus

An exhaust gas processing method using a device having an air preheater for preheating air for combustion in a combustion device by using an exhaust gas emitted from the combustion device; a gas-gas heater (GGH) heat recovery device composed of a heat transfer tube for recovering the heat of the exhaust gas to a heat medium; a dust collector; a wet-type desulfurization device; a gas-gas heater (GGH) re-heater composed of a heat transfer tube for heating the exhaust gas at its outlet by using the heat medium supplied from the gas-gas heater heat recovery device, which are installed in that order from the upstream to the downstream of an exhaust gas duct of the combustion device.

Exhaust gas treating method

An exhaust gas processing device includes an air preheater for preheating air for combustion in a combustion device by using an exhaust gas emitted from the combustion device; a gas-gas heater heat recovery device composed of a heat transfer tube for recovering the heat of the exhaust gas to a heat medium; a dust collector; a wet-type desulfurization device; a gas-gas heater re-heater composed of a heat transfer tube for heating the exhaust gas at its outlet by using the heat medium supplied from the gas-gas heater heat recovery device, which are installed in that order from the upstream to the downstream of an exhaust gas duct of the combustion device.

Exhaust gas treating apparatus

Growing community of inventors

Hiroshima, Japan

Takayuki Saitou