Method for Treating Exhaust Gases Containing Sulfur Oxides

A method for the purification of sulfur oxides-containing exhaust gases arising from technical processes, wherein the method comprises the step of removing the sulfur oxides for the purpose of reducing the sulfur oxide content in the exhaust gases,

• wherein the sulfur oxides-containing exhaust gases are subjected to an exhaust gas treatment by desulfurization by means of at least one particulate sulfur oxide-reactive exhaust gas treatment reagent,
• wherein:
• (a) first, in a method step (a), the sulfur oxides-containing exhaust gases are brought into contact with the exhaust gas treatment reagent such that an exhaust gas stream containing the exhaust gas treatment reagent is obtained, wherein the exhaust gas treatment reagent is injected into the exhaust gases in fine dispersion by means of at least one first lance-shaped injection device, and
• (b) subsequently, in a method step (b), the exhaust gas stream containing the exhaust gas treatment reagent is brought into contact with water vapor such that the exhaust gas treatment reagent is reacted with the sulfur oxides contained in the exhaust gases, wherein the water vapor is injected into the exhaust gases in fine dispersion by means of at least one second lance-shaped injection device, wherein the second lance-shaped injection device is kept free from the exhaust gas treatment reagent by means of at least one displacement body,
• wherein, subsequently to method step (b), the amount of water vapor in the exhaust gases is reduced.

A method for the purification of sulfur oxides-containing exhaust gases arising from technical processes, wherein the method comprises the step of removing the sulfur oxides for the purpose of reducing the sulfur oxide content in the exhaust gases,

• wherein the sulfur oxides-containing exhaust gases are subjected to an exhaust gas treatment by desulfurization by means of at least one particulate sulfur oxide-reactive exhaust gas treatment reagent;
• wherein:
• (a) first, in a method step (a), the sulfur oxides-containing exhaust gases are brought into contact with the exhaust gas treatment reagent such that an exhaust gas stream containing the exhaust gas treatment reagent is obtained,
• wherein the exhaust gas treatment reagent is injected into the exhaust gases in fine dispersion by means of at least one first lance-shaped injection device,
• wherein the exhaust gas treatment reagent is at least one of a hydrated lime and a hydrated lime containing reagent with at least 50% by weight hydrated lime, based on the hydrated lime containing reagent and
• wherein the exhaust gas treatment reagent has average grain sizes D50 in the range of from 1 to 50 μm, determined by sieve analysis;
• and
• (b) subsequently, in a method step (b), the exhaust gas stream containing the exhaust gas treatment reagent is brought into contact with water vapor such that the exhaust gas treatment reagent is reacted with the sulfur oxides contained in the exhaust gases,
• wherein the water vapor is injected into the exhaust gases in fine dispersion by means of at least one second lance-shaped injection device,
• wherein the amount of water vapor in the exhaust gas stream containing the exhaust gas treatment reagent is increased by 0.1 to 20% by volume,
• wherein the water vapor is supplied to the exhaust gas stream with a velocity which is at least twice as high as the velocity of the exhaust gas stream, and
• wherein the second lance-shaped injection device is kept free from the exhaust gas treatment reagent by means of at least one displacement body;
• wherein, subsequently to method step (b), the amount of water vapor in the exhaust gases is reduced.

A system for the purification of sulfur oxides-containing exhaust gases arising from technical processes for the purpose of removing the sulfur oxides,

• wherein the system comprises an exhaust gas generating device for carrying out a technical process generating sulfur oxides-containing exhaust gases and
• wherein the system further comprises an exhaust gas treatment device for the exhaust gas treatment of the sulfur oxide-containing exhaust gases generated in the exhaust gas generating device, which exhaust gas treatment device is arranged downstream from the exhaust gas generating device,
• wherein the exhaust gas treatment device comprises an exhaust gas treatment chamber,
• wherein the exhaust gas treatment chamber comprises at least one first section and, downstream from the first section, a second section, wherein the exhaust gas treatment device further comprises:
• (A) arranged in the first section of the exhaust gas treatment chamber, at least one first lance-shaped injection device for injecting an exhaust gas treatment reagent in fine dispersion into the sulfur oxides-containing exhaust gases, wherein the first injection device is configured such that an exhaust gas stream containing the exhaust gas treatment reagent is obtained, and,
• (B) arranged in the second section of the exhaust gas treatment chamber and arranged downstream from the first injection device, at least one second lance-shaped injection device for injecting, via discharge openings, water vapor into the exhaust gas stream containing the exhaust gas treatment reagent, wherein the second injection device is configured such that the exhaust gas treatment reagent is reacted with the sulfur oxides contained in the exhaust gases,
• wherein at least one displacement body is arranged between the first section of the exhaust gas treatment chamber and the second section of the exhaust gas treatment chamber, wherein the displacement body is configured to generate an area being at least essentially free of exhaust gas treatment reagent for supplying the water vapor in the area of the water vapor discharge openings of the second injection device.