Method for controlling acidic compounds produced for oxy-combustion processes

A method for treating one or more acidic compounds generated during an oxy-combustion process, the method comprising the steps of:

• (a) generating a flue gas stream as a result of the oxy-combustion of at least one carbonaceous fuel, wherein the flue gas stream contains at least one type of gaseous acid compound and/or gaseous acid precursor compound;
• (b) treating the flue gas stream to remove at least a portion of at least one gaseous acid compound and/or gaseous acid precursor compound present therein via the use of at least one flue gas treatment device;
• (c) subjecting at least a portion of the flue gas stream from Step (b) to at least one compression step and/or cooling step so as to remove at least one additional gaseous acid compound and/or gaseous acid precursor compound, present therein, wherein the compression step and/or cooling step yields a liquid-based acidic waste stream generated as a result of the removal of the at least one additional gaseous acid compound and/or gaseous acid precursor compound and an acid-depleted, or acid-lean, flue gas stream;
• (d) recycling at least a portion of the liquid-based acidic waste stream to the at least one flue gas treatment device of Step (b) for treatment, or neutralization, therein;
• (e) subjecting the acid-depleted, or acid-lean, flue gas stream to at least one additional emissions control and/or flue gas treatment technology;
• and
• (f) subjecting the acid-depleted, or acid-lean, flue gas stream to carbon dioxide recovery so as to recover a majority of the carbon dioxide present in the acid-depleted, or acid-lean, flue gas stream prior to the release of a portion of the remaining acid-depleted, or acid-lean, flue gas stream to the atmosphere.

A method for treating one or more acidic compounds generated during an oxy-combustion process, the method comprising the steps of:

• (I) generating a flue gas stream as a result of the oxy-combustion of at least one carbonaceous fuel, wherein the flue gas stream contains at least one type of gaseous acid compound and/or gaseous acid precursor compound;
• (II) treating the flue gas stream to remove at least a portion of at least one gaseous acid compound and/or gaseous acid precursor compound present therein via the use of at least one flue gas treatment device;
• (III) subjecting the flue gas stream from Step (II) to at least one compression step and/or cooling step so as to remove at least one additional gaseous acid compound and/or gaseous acid precursor compound present therein, wherein the compression step and/or cooling step yields a liquid-based acidic waste stream generated as a result of the removal of the at least one gaseous acid compound and/or gaseous acid precursor compound and an acid-depleted, or acid-lean, flue gas stream;
• (IV) recycling at least a portion of the liquid-based acidic waste stream to the at least one flue gas treatment device of Step (II) for treatment, or neutralization, therein;
• (V) subjecting the acid-depleted, or acid-lean, flue gas stream to at least one additional emissions control and/or flue gas treatment technology;
• and
• (VI) subjecting the acid-depleted, or acid-lean, flue gas stream to carbon dioxide recovery so as to recover a majority of the carbon dioxide present in the acid-depleted, or acid-lean, flue gas stream prior to the release of a portion of the remaining acid-depleted, or acid-lean, flue gas stream to the atmosphere,
• wherein the liquid-based acidic waste stream is split into at least two liquid-based acidic waste streams, a portion of each split liquid-based waste stream then being subjected to recycling in the at least one flue gas treatment device of Step (II) for treatment, or neutralization, therein.