Self cleaning, steam cooled, gas sample probe

• US 4,283,947 A
• Filed: 09/10/1979
• Issued: 08/18/1981
• Est. Priority Date: 09/10/1979
• Status: Expired due to Term

• Current Assignee: Kennecott Utah Copper Corporation (Rio Tinto Limited)
• Original Assignee: Kennecott Copper Corp. (Rio Tinto Limited)
• Inventors: George, David B., Bailey, Leonard K.
• Primary Examiner(s): Goldberg, Gerald
• Assistant Examiner(s): Corr, Denis E.
• Application Number:
  US06/074,059
• Time in Patent Office: 708 Days
• Field of Search: 73/421.5 R, 73/421.5 A
• US Class Current: 73/863.11
• CPC Class Codes: G01N 1/2247 Sampling from a flowing stream of gas
• CPC Class Codes: G01N 2001/2285 Details of probe structures

Abstract

A gas sampling probe for industrial furnaces, such as reverberatory furnaces used in extractive metallurgy, is constructed with a sample tube concentrically disposed within a shield tube and spaced therefrom to provide an annular passage for a coolant fluid, such as steam or water vapor, which is discharged from the shield tube through ports therein located, for example, above the open lower end of the sample tube, as well as through the lower open end of such shield tube. The shield tube extends below the lower open end of the sample tube as a protection against accretion build-up, and an annular partition plate which is secured to the shield tube but terminates short of the sample tube permits free expansion and contraction of the sample tube while limiting discharge of the coolant fluid through the lower open end of the shield tube.

Claims

1. A gas sampling probe adapted for installation in an industrial furnace for removing sample portions of the gaseous atmosphere within such furnace, comprising a shield tube having an open end for placement within the furnace;

a sample tube concentrically disposed within the shield tube and spaced therefrom to provide an annular passage for a coolant fluid, said sample tube terminating within the shield tube in an open end that is protectively surrounded by said shield tube;

a partition plate extending across said annular passage between the shield tube and the sample tube adjacent to the open end of the latter, said partition plate being secured to the shield tube but terminating short of the sample tube, so as to permit free expansion and contraction of such sample tube and provide restricted passage for coolant fluid toward and past the open end of the sample tube to keep it clean;

means for introducing a coolant fluid into said annular passge at or near the other end of the shield tube;

port means at one side of the shield tube and at the side of the partition plate that is away from the open ends of the tubes, so as to discharge a major amount of the coolant fluid from the annular passage into a stream of furnace gas flowing past the probe; and

means discharging sample gas from the sample tube at or near the other end thereof, so that the flow of that portion of the coolant fluid that passes by the partition plate in said annular passage is in substantially the opposite direction to the flow of said sample gas.

2. A gas sampling probe in accordance with claim 1, wherein the probe is adapted to be installed in a furnace in substantially vertical position with the open ends of the shield and sample tubes directed downwardly.

3. A gas sampling probe in accordance with claim 1, wherein the restricted passage for coolant fluid between the partition plate and the sample tube is an annulus whose gap is very narrow relative to the partition plate.

4. The combination of a gas sampling probe in accordance with claim 1 and an industrial furnace, the concentric tubes extending through a wall of the furnace.