University of Cincinnati

Soon-Jai Khang

Timothy C Keener

Antoinette Weil Stein

Kew-Ho Lee

A multiple-field precipitator, flue-gas treating device, in accordance with the principles of the invention, includes a first section having a dual-function, sensible-cooling heat exchanger/electrostatic precipitator, a second section having a wet electrostatic precipitator, and a middle section fluidly connecting the first and second sections. In the first section, the exchanger/precipitator sensibly cools the flue gas and collects most of the dust from the flue gas. In the middle section, the dust-reduced flue gas is combined with an alkaline material, thereby forming reaction products. These reaction products and several other pollutants are captured by the wet electrostatic precipitator, in the form of a pollutant-laden liquid. The pollutant-laden liquid is directed to a series of heat exchangers and settling tanks, where various pollutants such as SO, metals, NO, and chlorides are removed in different stages. In addition, ammonia is liberated from the pollutant-laden liquid, and circulated back to the middle section, where it is combined with additional dust-reduced flue gas to form additional reaction products for subsequent capture in the wet electrostatic precipitator.

Method for treating flue gas

A two stage method is described for the removal of NO,and SO,from flue gas. The first stage removes all NO,by sodium sulfite sorbent injection. The second stage removes SO,by sodium bicarbonate injection. The sodium sulfite product formed in the second stage is transferred to the first stage for injection.

Process for removal of nitric oxides and sulfur oxides from flue gases

An apparatus and process for desulfurizing and denitrifying coal by pyrolysis and subsequently treating the gaseous pyrolysis by-products with a solid sorbent to substantially reduce the release of SO.sub.x gases to acceptable levels. In one aspect of the invention, coal is pyrolyzed in the inner chamber of the desulfurization and denitrification apparatus to drive off the sulfur and nitrogen compounds contained therein. In another aspect of the invention, the gaseous by-products of pyrolysis are treated with a solid sorbent in the outer chamber of the desulfurization and denitrification apparatus to substantially desulfurize those gases. In a further aspect of the invention, the desulfurized gases, which contain nitrogen compounds, are combusted under controlled conditions to minimize the production of NO.sub.x gases.

Method and apparatus for desulfurizing and denitrifying coal

The present invention concerns a method of making a silica-based membrane comprising the steps of:

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Cincinnati, OH, United States of America

Soon-Jai Khang