Method and apparatus for gas monitoring

• US 5,205,177 A
• Filed: 01/23/1991
• Issued: 04/27/1993
• Est. Priority Date: 01/23/1991
• Status: Expired due to Fees

• Current Assignee: Hamon d'Hondt SA (Pal Invest)
• Original Assignee: Research-Cottrell Incorporated
• Inventors: DuBrock, Robert E. Jr., Kohout, Donald J.
• Primary Examiner(s): RAEVIS, ROBERT R
• Application Number:
  US07/644,706
• Time in Patent Office: 825 Days
• Field of Search: 73/863.12, 73/863.81, 73/863.83, 73/864.81
• US Class Current: 73/863.12
• CPC Class Codes: G01N 1/2247 Sampling from a flowing stream of gas
• CPC Class Codes: G01N 1/2258 in a stack or chimney
• CPC Class Codes: G01N 33/0016 by regulating a physical variable, e.g. pressure, temperature

Abstract

A method and apparatus for monitoring a flue gas is provided. The gas sampling system includes a conditioning unit proximate to a point where the sample is taken, an analyzing unit at a location removed from the point where the sample is taken and a gas sample transport line connecting the conditioning unit and analyzing unit.

Claims

1. A system for sampling a gas stream and for analyzing the gas stream sample, comprising:

means for taking a gas sample from the gas stream;

means for conditioning the gas sample, said conditioning means receiving the gas sample and removing moisture therefrom and being disposed proximate to said sampling means,

means for analyzing the gas sample to determine the concentration of at least one component of the gas sample, said analyzing means being at a location distant from said sampling means and said conditioning means;

a first gas sample transport line fluidically connecting said conditioning means to said analyzing means to conduct the gas sample from said conditioning means to said analyzing means; and

a second gas sample transport line fluidically connecting said sampling means to said conditioning means to conduct the gas sample from said sampling means to said conditioning means, said conditioning means including;

a first condenser;

a first drain to remove condensed liquid from said first condenser;

a gas sample pump having an inlet and an outlet, said gas sample pump creating a gas suction at its inlet and a gas exhaust pressure at its outlet, said pump inlet being in fluidic communication with said first condenser to draw the gas sample through said sampling means and said first condenser into said sample pump inlet, said sample pump outlet being in fluidic communication with said first gas sample transport line;

a second condenser in which vapor in the gas sample is condensed, said second condenser being in fluidic communication with said sample pump outlet and said first transport line such that the gas sample discharged from said pump outlet enters said second condenser before entering said first sample transport line, the pressure of the sample in said second condenser being greater than ambient air pressure outside said system; and

a second drain to remove condensed liquid from said second condenser;

said first and second condensers including refrigerated coils through which the gas sample passes.