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

Abstract

A process 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.degree. to 125.degree. 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 2.0more » 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.« less

Inventors:
 [1]
  1. Columbus, OH
Issue Date:
Research Org.:
Battelle Memorial Institute, Columbus, OH (United States)
OSTI Identifier:
866126
Patent Number(s):
4640825
Assignee:
Battelle Memorial Institute (Columbus, OH)
Patent Classifications (CPCs):
C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02A - TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
DOE Contract Number:  
AC22-83PC60264
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
process; simultaneous; removal; gas; streams; stream; flowing; spray; dryer; absorbing; portion; content; zno; contacting; aqueous; slurry; controlling; outlet; temperature; range; degree; 125; approach; adiabatic; saturation; unreacted; absorbed; fabric; filter; collecting; solids; therein; remaining; sufficient; collected; react; passes; whereby; overall; feed; ratio; plus; moles; mole; particulates; removed; prior; treatment; allows; regeneration; reacted; absorb; acid; recovery; simultaneous removal; gas passes; saturation temperature; spray dryer; stream prior; gas outlet; gas stream; gas streams; aqueous slurry; outlet temperature; /423/

Citation Formats

Rosenberg, Harvey S. Process for simultaneous removal of SO.sub.2 and NO.sub.x from gas streams. United States: N. p., 1987. Web.
Rosenberg, Harvey S. Process for simultaneous removal of SO.sub.2 and NO.sub.x from gas streams. United States.
Rosenberg, Harvey S. Thu . "Process for simultaneous removal of SO.sub.2 and NO.sub.x from gas streams". United States. https://www.osti.gov/servlets/purl/866126.
@article{osti_866126,
title = {Process for simultaneous removal of SO.sub.2 and NO.sub.x from gas streams},
author = {Rosenberg, Harvey S},
abstractNote = {A process 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.degree. to 125.degree. 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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1987},
month = {1}
}

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