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Title: Method and apparatus for nitrogen oxide determination

Abstract

Method and apparatus for determining nitrogen oxide content in a high temperature process gas, which involves withdrawing a sample portion of a high temperature gas containing nitrogen oxide from a source to be analyzed. The sample portion is passed through a restrictive flow conduit, which may be a capillary or a restriction orifice. The restrictive flow conduit is heated to a temperature sufficient to maintain the flowing sample portion at an elevated temperature at least as great as the temperature of the high temperature gas source, to thereby provide that deposition of ammonium nitrate within the restrictive flow conduit cannot occur. The sample portion is then drawn into an aspirator device. A heated motive gas is passed to the aspirator device at a temperature at least as great as the temperature of the high temperature gas source. The motive gas is passed through the nozzle of the aspirator device under conditions sufficient to aspirate the heated sample portion through the restrictive flow conduit and produce a mixture of the sample portion in the motive gas at a dilution of the sample portion sufficient to provide that deposition of ammonium nitrate from the mixture cannot occur at reduced temperature. A portionmore » of the cooled dilute mixture is then passed to analytical means capable of detecting nitric oxide.« less

Inventors:
 [1]
  1. (Idaho Falls, ID)
Issue Date:
Research Org.:
WESTINGHOUSE IDAHO NUCLEAR CO
OSTI Identifier:
867621
Patent Number(s):
4974453
Assignee:
United States Department of Energy (Washington, DC) INEEL
DOE Contract Number:  
AC07-84ID12435
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; apparatus; nitrogen; oxide; determination; determining; content; temperature; process; gas; involves; withdrawing; sample; portion; containing; source; analyzed; passed; restrictive; flow; conduit; capillary; restriction; orifice; heated; sufficient; maintain; flowing; elevated; provide; deposition; ammonium; nitrate; occur; drawn; aspirator; device; motive; nozzle; conditions; aspirate; produce; mixture; dilution; reduced; cooled; dilute; analytical; means; capable; detecting; nitric; nitrogen oxide; flow conduit; temperature gas; ammonium nitrate; process gas; gas containing; elevated temperature; temperature sufficient; gas source; nitric oxide; reduced temperature; temperature process; conditions sufficient; means capable; dilute mixture; flowing sample; oxide content; involves withdrawing; containing nitrogen; /73/

Citation Formats

Hohorst, Frederick A. Method and apparatus for nitrogen oxide determination. United States: N. p., 1990. Web.
Hohorst, Frederick A. Method and apparatus for nitrogen oxide determination. United States.
Hohorst, Frederick A. Mon . "Method and apparatus for nitrogen oxide determination". United States. https://www.osti.gov/servlets/purl/867621.
@article{osti_867621,
title = {Method and apparatus for nitrogen oxide determination},
author = {Hohorst, Frederick A.},
abstractNote = {Method and apparatus for determining nitrogen oxide content in a high temperature process gas, which involves withdrawing a sample portion of a high temperature gas containing nitrogen oxide from a source to be analyzed. The sample portion is passed through a restrictive flow conduit, which may be a capillary or a restriction orifice. The restrictive flow conduit is heated to a temperature sufficient to maintain the flowing sample portion at an elevated temperature at least as great as the temperature of the high temperature gas source, to thereby provide that deposition of ammonium nitrate within the restrictive flow conduit cannot occur. The sample portion is then drawn into an aspirator device. A heated motive gas is passed to the aspirator device at a temperature at least as great as the temperature of the high temperature gas source. The motive gas is passed through the nozzle of the aspirator device under conditions sufficient to aspirate the heated sample portion through the restrictive flow conduit and produce a mixture of the sample portion in the motive gas at a dilution of the sample portion sufficient to provide that deposition of ammonium nitrate from the mixture cannot occur at reduced temperature. A portion of the cooled dilute mixture is then passed to analytical means capable of detecting nitric oxide.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1990},
month = {1}
}

Patent:

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