Gas dilution apparatus

• US 3,892,549 A
• Filed: 06/13/1974
• Issued: 07/01/1975
• Est. Priority Date: 02/11/1974
• Status: Expired due to Term

• Current Assignee: Norman A. Lyshkow
• Original Assignee: Norman A. Lyshkow
• Inventors: Lyshkow, Norman A.
• Primary Examiner(s): Lutter, Frank W.
• Assistant Examiner(s): Lacey, David L.
• Application Number:
  US05/478,881
• Time in Patent Office: 383 Days
• Field of Search: 55/267,270,315,316,318,319,386,387,418,417,467,485,512,97,98 73/19,28,421R,421.5R,421.5A,422GC,422TC
• US Class Current: 73/863.12
• CPC Class Codes: B01D 53/02 by adsorption, e.g. preparative gas chromatography solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01
• CPC Class Codes: G01N 1/38 Diluting, dispersing or mixing samples
• CPC Class Codes: G01N 2001/2267 separating gas from liquid, e.g. bubbles
• CPC Class Codes: G01N 2001/227 separating gas from solid, e.g. filter
• CPC Class Codes: G01N 33/0004 Gaseous mixtures, e.g. polluted air gaseous biological material G01N33/497; exhaust gas of internal combustion engines G01M15/102

Abstract

Gas dilution apparatus for providing a source of a dilute gas containing a pollutant gas component for detection and/or analysis, in which a gas stream containing a pollutant gas is drawn into the apparatus and through first passage means and a trap to a gas scrubbing assembly. A small quantity of the gas stream containing the gaseous pollutant is drawn off from the first passage means by way of a restricted flow passage for admixture with the scrubbed gas from the gas scrubber assembly, with the restricted flow passage including heating means operatively connected thereto to maintain the temperature of the restricted flow passage above the due point of the gas stream.

Claims

1. APPARATUS FOR DILUTING FLUIDS COMPRISING A BODY, GAS INLET MEANS FOR RECEIVING A GAS STREAM CONTAINING A POLLUTANT GAS, FIRST PASSAGE MEANS IN THE BODY COMMUNICATING WITH THE GAS INLET MEANS, TRAP MEANS MOUNTED ON THE BODY AND COMMUNICATING WITH THE FIRST PASSAGE MEANS TO RECEIVE THE GAS STREAM FLOWING THERETHROUGH, GAS SCRUBBING MEANS ADAPTED TO REMOVE THE POLLUTANT GAS FROM THE GAS STREAM FLOWING THERETHROUGH, VIA SECOND PASSAGE MEANS WHICH COMMUNICATE WITH THE TRAP MEANS AND THE SCRUBBING MEANS, GAS DISCHARGE MEANS ADAPTED TO BE CONNECTED TO A ZONE OF REDUCED PRESSURE, SCRUBBED GAS PASSAGE MEANS COMMUNICATING WITH THE SCRUBBING MEANS AND THE DISCHARGE MEANS AND RESTRICTED FLOW PASSAGE MEANS EXTENDING INTO THE SCRUBBED GAS PASSAGE MEANS AND EXTENDING INTO THE FIRST PASSAGE MEANS WHEREBY REDUCED PRESSURE APPLIED AT THE DISCHARGE MEANS DRAWS THE GAS STREAM THROUGH THE INLET MEANS AND THROUGH THE FIRST PASSAGE MEANS TO PROVIDE FLOW OF THE BULK OF THE GAS STREAM THROUGH THE FIRST PASSAGE MEANS TO THE TRAP MEANS AND THEN THROUGH THE GAS SCRUBBING MEANS FOR REMOVAL OF POLLUTANT GAS THEREFROM AND TO FORM AN INERT DILUENT GAS AND TO PROVIDE FLOW OF A SMALL AMOUNT OF THE GAS STREAM CONTAINING POLLUTANT GAS THROUGH THE RESTRICTED FLOW PASSAGE MEANS TO PERMIT ADMIXTURE OF THE SMALL AMOUNT OF THE GAS STREAM CONTAINING POLLUTANT GAS, WITH THE RESTRICTED FLOW PASSAGE MEANS INCLUDING HEATING MEANS OPERATIVELY CONNECTED THERETO MAINTAIN THE TEMPERATURE OF THE RESTRICTED FLOW PASSAGE MEANS ABOVE THE DUE POINT OF THE GAS STREAM.

2. Apparatus as defined in claim 1 wherein the inlet means includes gas sampling means adapted to be inserted into the gas stream.

3. Apparatus as defined in claim 1 wherein the trap means is removably mounted on said body and is formed of a transparent material to permit visual inspection of the contents thereof.

4. AppaRatus as defined in claim 1 wherein the trap means communicates with the first passage means through first tube means and the trap means communicates with the second passage means through second tube means, with the first tube means projecting into the trap means farther than the second tube means.

5. Apparatus as defined in claim 1 wherein the gas scrubbing means includes one or more zones containing a material capable of removing pollutant gas from the gas stream.

6. Apparatus as defined in claim 1 wherein the gas scrubbing means includes three zones, with one zone containing means adapted to remove water from the gas stream, with the second zone containing means adapted to remove pollutant gas from the gas stream, and with the third zone containing means adapted to remove any remaining impurities in the gas stream.

7. Apparatus as defined in claim 1 wherein the gas scrubbing means is positioned in a cavity in the body, with the base of the gas scrubbing means being positioned about a conical chamber adapted to receive liquid from the gas scrubbing means for return to the trap means through the second passage means.

8. Apparatus as defined in claim 1 which includes valve means in the scrubbed gas passage means to control the flow of gases therethrough.

9. Apparatus as defined in claim 1 wherein the restricted flow passage means is a hollow needle having a small cross-sectional area whereby the small amount of gas flowing therethrough has a low kinetic energy to permit solid and liquid components to pass to the trap means.

10. Apparatus as defined in claim 9 wherein the scrubbed gas passage means terminates in a chamber, with the needle being positioned in the chamber extending into the scrubbed gas passage means.

11. Apparatus as defined in claim 10 wherein the needle extends into the scrubbed gas passage means beyond the discharge means.

12. Apparatus as defined in claim 9 wherein the needle is mounted in a hub in the body and the heating means is operatively connected to the hub to maintain the temperature of the needle above the due point of the gas stream.

13. Apparatus as defined in claim 12 wherein the heating means includes thermostat means to prevent overheating of the needle.

14. Apparatus as defined in claim 12 wherein the hub includes insulation to prevent heat loss therefrom.