ReACT(tm)

Hamon Research Cottrell enjoys a license agreement with J-Power, through their J-Power Entech subsidiary, for a fully commercial multipollutant control technology, called ReACT™, which is based on the use of activated coke as a dry regenerable adsorbent.

ReACT™ (Regenerative Activated Coke Technology) is an advanced version of the Bergbau-Forschburg process which was originally developed in the 1970s and was later developed by Mitsui Mining. J-Power acquired rights to the technology from Mitsui, and has since further improved the technology and implemented it at large scale at their coal-fired power plants at Takehara (1995) and Isogo (2004 and 2009) and have provided ReACT systems for steel mill and refinery applications. The J-Power 2 x 600 MW coal fired Isogo plant near Yokohoma Japan is the world's lowest emissions intensity power plant with SO2 and NOx emissions both at single digit ppm concentration levels.

The ReACT™ process controls SO2, NOx, Hg and particulate in a multistage regenerative process that produces salable byproduct.

A moving bed adsorber provides contact between flue gas (downstream of a primary particulate control device, typically an electrostatic precipitator) and activated coke pellets, where SO2, SO3, NOx, and Hg are adsorbed onto the carbon surfaces. Ammonia is injected upstream in order to promote the SO2 and NOx reactions. The moving bed acts as a particulate collection step as the impingment of the flue gas on the activated coke pellets provides "polishing" control of particulate.

This completely dry process does not evaporate any water into the gas stream.
Highly efficient capture of SO2 and SO3 (>98%) can be incorporated into the design.
NOx capture can be in the range of 30 to 60%.
Mercury capture is in the range of 90%.
A net reduction of particulate in the range of 50% is expected.

Cleaned flue gas to the stack remains at higher temperature, without increased moisture, and with greatly reduced SO3, resulting in a stack discharge with little or no plume compared to SDA, CDS, or WFGD processes.

Activated coke from the adsorber is then processed in a regenerator vessel which completes the reduction of NOx to N2, and drives off SOx in a concentrated sulfur rich gas stream. Adsorbed mercury is retained in the activated coke in a region of the regenerator where temperature conditions allow the mercury to accumulate. Regenerated activated coke is screened to remove fines and returned to the absorber.

Sulfur rich gas is then processed using conventional technology to produce salable sulfuric acid.

This process is especially suited for utilities burning low sulfur coals, such as PRB coals, and for sites where water use, water treatment or discharge are issues.

ReACT™ is applicable for utility and industrial processes including:

Sinter plants
Incineration
RFCC
Coal fired boilers