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Title: Process for simultaneous removal of SO[sub 2] and NO[sub x] from gas streams

Abstract

A process is described for simultaneous removal of SO[sub 2] and NO[sub x] from a gas stream that includes flowing the gas stream to a spray dryer and absorbing a portion of the SO[sub 2] content of the gas stream and a portion of the NO[sub x] content of the gas stream with ZnO by contacting the gas stream with a spray of an aqueous ZnO slurry; controlling the gas outlet temperature of the spray dryer to within the range of about a 0 to 125 F approach to the adiabatic saturation temperature; flowing the gas, unreacted ZnO and absorbed SO[sub 2] and NO[sub x] from the spray dryer to a fabric filter and collecting any solids therein and absorbing a portion of the SO[sub 2] remaining in the gas stream and a portion of the NO[sub x] remaining in the gas stream with ZnO; and controlling the ZnO content of the aqueous slurry so that sufficient unreacted ZnO is present in the solids collected in the fabric filter to react with SO[sub 2] and NO[sub x] as the gas passes through the fabric filter whereby the overall feed ratio of ZnO to SO[sub 2] plus NO[sub x] is aboutmore » 1.0 to 4.0 moles of ZnO per of SO[sub 2] and about 0.5 to 2.0 moles of ZnO per mole of NO[sub x]. Particulates may be removed from the gas stream prior to treatment in the spray dryer. The process further allows regeneration of ZnO that has reacted to absorb SO[sub 2] and NO[sub x] from the gas stream and acid recovery. 4 figs.« less

Inventors:
Issue Date:
OSTI Identifier:
7260483
Patent Number(s):
4640825
Application Number:
PPN: US 6-716290
Assignee:
Battelle Memorial Inst., Columbus, OH (United States)
DOE Contract Number:  
AC22-83PC60264
Resource Type:
Patent
Resource Relation:
Patent File Date: 26 Mar 1985
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; ADSORBENTS; REGENERATION; FLUE GAS; DENITRIFICATION; DESULFURIZATION; ADSORPTION; AIR POLLUTION CONTROL; FABRIC FILTERS; NITROGEN OXIDES; SPRAY DRYING; SULFUR DIOXIDE; ZINC OXIDES; CHALCOGENIDES; CHEMICAL REACTIONS; CONTROL; DRYING; FILTERS; GASEOUS WASTES; NITROGEN COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; POLLUTION CONTROL; SORPTION; SULFUR COMPOUNDS; SULFUR OXIDES; WASTES; ZINC COMPOUNDS; 010800* - Coal, Lignite, & Peat- Waste Management

Citation Formats

Rosenberg, H S. Process for simultaneous removal of SO[sub 2] and NO[sub x] from gas streams. United States: N. p., 1987. Web.
Rosenberg, H S. Process for simultaneous removal of SO[sub 2] and NO[sub x] from gas streams. United States.
Rosenberg, H S. Tue . "Process for simultaneous removal of SO[sub 2] and NO[sub x] from gas streams". United States.
@article{osti_7260483,
title = {Process for simultaneous removal of SO[sub 2] and NO[sub x] from gas streams},
author = {Rosenberg, H S},
abstractNote = {A process is described for simultaneous removal of SO[sub 2] and NO[sub x] from a gas stream that includes flowing the gas stream to a spray dryer and absorbing a portion of the SO[sub 2] content of the gas stream and a portion of the NO[sub x] content of the gas stream with ZnO by contacting the gas stream with a spray of an aqueous ZnO slurry; controlling the gas outlet temperature of the spray dryer to within the range of about a 0 to 125 F approach to the adiabatic saturation temperature; flowing the gas, unreacted ZnO and absorbed SO[sub 2] and NO[sub x] from the spray dryer to a fabric filter and collecting any solids therein and absorbing a portion of the SO[sub 2] remaining in the gas stream and a portion of the NO[sub x] remaining in the gas stream with ZnO; and controlling the ZnO content of the aqueous slurry so that sufficient unreacted ZnO is present in the solids collected in the fabric filter to react with SO[sub 2] and NO[sub x] as the gas passes through the fabric filter whereby the overall feed ratio of ZnO to SO[sub 2] plus NO[sub x] is about 1.0 to 4.0 moles of ZnO per of SO[sub 2] and about 0.5 to 2.0 moles of ZnO per mole of NO[sub x]. Particulates may be removed from the gas stream prior to treatment in the spray dryer. The process further allows regeneration of ZnO that has reacted to absorb SO[sub 2] and NO[sub x] from the gas stream and acid recovery. 4 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1987},
month = {2}
}