Clean the Sky
Comprehensive exhaust gas treatment possible with activated charcoal
The SHI Group created a unique dry exhaust gas treatment facility, based on many years of research and development.
This facility can be summed up by the following three key phrases:
In the 1960s the SHI Group launched developmental research for a dry exhaust gas treatment facility that uses activated charcoal. After research into the functional aspects, as well as research on the flow of activated charcoal inside the moving bed that involved the participation by the Division, pilot tests were conducted, involving actual sintering machines and exhaust gases from boilers.
The results led to the delivery of an exhaust gas treatment facility for crude oil boilers at Kansai Electric Power Co., Inc., in 1972. Validation tests were then conducted for the treatment of exhaust gases from coal fired boilers, which led to the delivery of a facility for a 600MW power plant at the Electric Power Development Planning Co., Ltd. Isogo Thermal Power Plant in 2002. Research and development for a treatment facility that can be operated to desulfurize and denitrate simultaneously, intended for steel manufacturing sintering facilities was launched in 1971, which resulted in the delivery of the first unit to Nippon Steel Corporation's Nagoya Works in 1987. Since then, deliveries have not been limited to domestic destinations and a total of ten units for the treatment of exhaust gases from sintering were delivered to Australia, Korea and China.
Other than this, this equipment is also in use in exhaust gas treatment facilities for cement kilns and incinerators.
All these delivered facilities are in good working order and have been rated positively by our customers. A list of commercial equipment delivery destinations is shown in Table 1.
|Delivery destination||Applicable gases||Treated gas flow rate
|Year of construction completion||Remarks|
|Nippon Steel Corporation's Nagoya Works||Sintering machine No. 3||900,000||1987||Commercial equipment|
|Nippon Steel Corporation's Nagoya Works||Sintering machines Nos. 1 and 2||1,300,000||1999||Commercial equipment|
|Electric Power Development Planning Co., Ltd. Isogo Thermal Power Plant||Pulverized coal fired boiler||1,800,000||2002||Commercial equipment|
|Omuta City in Fukuoka Prefecture Recycle Power Plant||RDF fired boiler||106,000||2003||Commercial equipment|
|Blue Scope Steel (formerly BHP)
Port Kembla Steel Works
|Sintering machine No. 3||1,552,000||2003||Commercial equipment|
|Nippon Steel Corporation's Oita Works||Sintering machine No. 1||1,300,000||2003||Commercial equipment|
|POSCO Pohang Steelworks||Sintering machine No. 3||1,350,000||2004||Commercial equipment|
|POSCO Pohang Steelworks||Sintering machine No. 4||1,350,000||2004||Commercial equipment|
|Nippon Steel Corporation's Kimitsu Works||Sintering machine No. 3||1,650,000||2004||Commercial equipment|
|Taiheiyo Cement Corporation||Cement kiln||160,000||2006||Commercial equipment|
|Kobe Steel, Ltd. Kakogawa Works||Sintering machine No. 1||1,500,000||Commercial equipment|
|Shanxi Taigang Stainless Steel Co.,Ltd.||Sintering machine No. 2||1,444,000||2010||Commercial equipment|
|Shanxi Taigang Stainless Steel Co.,Ltd.||Sintering machine No. 3||2,026,000||2010||Commercial equipment|
The facilities use activated charcoal, a superior absorbing agent capable of absorbing and eliminating harmful constituents, such as heavy metals and sulfuric trioxides, which are difficult to remove through other methods. The catalytic features of active charcoal are also used to decompose and eliminate nitrogen oxides. The activated charcoal in the moving bed moves slowly in a vertical direction (top to bottom). As it moves it comes into contact with the exhaust gases that flow in a horizontal direction, eliminating harmful constituents. This method is referred to as the cross flow moving bed method and also provides a dust collecting function. This method is capable of eliminating dust in exhaust gases.
Activated charcoal with absorbed harmful constituents is heated in the regeneration tower that has an inert atmosphere to discharge (release) the absorbed harmful constituents. Once the harmful constituents have been discharged (released), the collected dust and activated charcoal is sorted by sifting and sent once again to the absorption reaction tower to remove harmful constituents. The moving bed is divided into three layers and the structure is such that the displacement of each layer can be changed externally. This makes it possible to optimize operation while observing the operating conditions.
|Dry exhaust gas treatment facilities||Comprehensive exhaust gas treatment facilities use the regenerative recycling of activated charcoal without reducing exhaust gas temperatures.|
Energy & Environment Group