# US 4,400,363 A · Method for the removal of sulfur oxides and nitrogen oxides from exhaust gases

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- Number: US 4,400,363 A
- Document ID: US4400363A
- Status: Granted
- Kind: A
- Application number: 06/253,652
- Filed: 1981-04-13
- Granted: 1983-08-23
- Earliest claimed: 1980-04-18
- Assignees: Bergwerksverband GmbH
- Inventors: Horst Grochowski; Karl Knoblauch
- Web page: https://patentgrep.com/patent/US4400363A

## CPC

- B01D 53/8637: {Simultaneously removing sulfur oxides and nitrogen oxides}
- B01D 53/60: Simultaneously removing sulfur oxides and nitrogen oxides
- Y02A 50/20: Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02C 20/10: of nitrous oxide (N2O)
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02C: CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]

## Abstract

Sulfur oxides and nitrogen oxides are removed from exhaust gases containing additionally oxygen and steam, by the addition of gaseous ammonia at temperatures between about 110.degree. and 180.degree. C. The exhaust gases travel in the interior of a reactor across a travelling bed which goes from above to below, composed of granulated, carbon-containing adsorbent with or without catalysts. In the first travelling bed initially a large portion of the sulfur oxides is adsorptively removed. In the second travelling bed after dosed addition of gaseous ammonia the nitrogen oxides are catalytically reduced to nitrogen as well as further sulfur oxides being separated. The improvement involves extending the path of the exhaust gases between the first and the second travelling beds and introducing into the volume of the exhaust gas stream between the travelling beds a forced mixture of dosed added ammonia with the exhaust gas departing from the first travelling bed.

## Claims

### Claim 1

In a method for removal of sulfur oxides and nitrogen oxides from exhaust gases, which additionally contain oxygen and steam, by addition of gaseous ammonia at temperatures between about 110.degree. and 180.degree. C., whereby the exhaust gases travel in the interior of a reactor across a travelling bed, which goes from above to below, of granulated, carbon-containing adsorbent, whereby in a first travelling bed initially a large portion of the sulfur oxides is absorptively removed and in a second travelling bed after dosed addition of gaseous ammonia the nitrogen oxides are catalytically reduced to nitrogen as well as further sulfur oxides being separated, the improvement comprising extending the path of said exhaust gas between said first and said second travelling bed and introducing into the volume of the exhaust gas stream between said first and said second travelling bed a forced mixture of dosed added ammonia with the exhaust gas departing from said first travelling bed.

### Claim 2 (depends on 1)

Method according to claim 1, wherein said ammonia is introduced in the exhaust gases in one or more places in the direction of flow of the exhaust gases.

### Claim 3 (depends on 1)

Method according to claim 1, wherein said dosed added ammonia is introduced in smaller amounts in an upper space and in larger amounts in a lower space of said volume of the exhaust gas stream between said travelling beds.