Test Bench Gas Flow Control System and Method

• US 20140335626A1
• Filed: 05/10/2013
• Published: 11/13/2014
• Est. Priority Date: 05/10/2013
• Status: Abandoned Application

• Current Assignee: Clean Diesel Technologies, Inc.
• Original Assignee: CDTI
• Inventors: Hatfield, Randal L.
• Application Number:
  US13/891,758
• Publication Number:
  US 20140335626A1
• Time in Patent Office: Days
• US Class Current: 436/37
• CPC Class Codes: G01N 31/10 using catalysis
• CPC Class Codes: G01N 33/0073 Control unit therefor

Abstract

The present disclosure may include a method for preparing gas mixtures of use in testing catalysts, where the method may include using separate banks of mass flow controllers for mixing the gas composition to the desired composition and for controlling the flow of the gas composition through the heater. A separate bank may be used for controlling any suitable mix of reducing agents while another separate bank may be used for controlling any suitable mix of oxidizing gases.

Claims

1. A method for the preparation of gas mixtures, comprising:

mixing at least one oxidizing component with at least one reducing component;

adding H₂O vapor to the mixture;

heating the H₂O vapor added mixture to produce a heated mixture;

providing interaction of the heated mixture with at least one sample catalyst; and

analyzing a portion of the interacted mixture.

2. The method of claim 1, wherein the heating may be from about 130°

C. to about 180°

C.

3. The method of claim 1, wherein the heating may be to about 150°

C.

4. The method of claim 1, wherein the adding of H₂O vapor is provided by an evaporation block.

5. The method of claim 4, wherein the evaporation block may have a temperature of about 110°

C. to about 150°

C.

6. The method of claim 4, wherein the evaporation block may have a temperature of about 130°

C.

7. The method of claim 1, wherein the at least one oxidizing component comprises at least one selected from the group consisting of N₂, H₂, O₂, CO₂, and combinations thereof.

8. The method of claim 1, wherein the at least one reducing component comprises at least one selected from the group consisting of N₂, H₂, CO, NO, C3H₈, C₁₀H₂₂, C₇H₈, CH₃(CH₂)₁₀CH₃ and combinations thereof.

9. An apparatus for the preparation of gas mixtures, comprising:

at least two gas delivery banks, each for delivering at least one of a plurality of gasses, and each comprising;

at least one gas source for receiving at least one input gas;

at least one control valve operable on the at least one input gas;

at least one pressure regulator operable on the at least one input gas;

a plurality of mass flow controllers operable on the at least one input gas; and

at least one output for outputting a mass-flow controlled, regulated one of the at least one input gas as the delivered at least one of the plurality of gasses; and

at least one evaporation block suitable for adding H₂O to a mixture of more than one of the the delivered at least one of the plurality of gasses received from a respective one of the at least two gas delivery banks;

wherein the ratio of the mixture of the more than one of the the delivered at least one of the plurality of gasses is at least partially controlled by respective ones of the plurality of mass flow controllers of ones of the at least two gas delivery banks.

10. The apparatus of claim 9, wherein the evaporation block may have a temperature of about 110°

C. to about 150°

C.

11. The apparatus of claim 9, wherein the evaporation block may have a temperature of about 130°

C.

12. The apparatus of claim 9, wherein one of the delivered at least one of the plurality of gasses comprises at least one oxidizing component.

13. The apparatus of claim 12, wherein the at least one oxidizing component is selected form the group consisting of N₂, H₂, O₂, CO₂, and combinations thereof.

14. The apparatus of claim 9, wherein one of the delivered at least one of the plurality of gasses comprises at least one reducing component.

15. The method of claim 14, wherein the at least one reducing component is selected form the group consisting of N₂, H₂, CO, NO, C3H₈, C₁₀H₂₂, C₇H₈, CH₃(CH₂)₁₀CH₃ and combinations thereof.

16. The apparatus of claim 9, wherein the at least one control valve is selected from the group consisting of a solenoid valve, a hydraulic valve, a pneumatic valve, and any combination thereof.

17. The apparatus of claim 9, further comprising a heating element suitable for heating at least one the delivered at least one of the plurality of gasses.

18. The method of claim 17, wherein the heating may be from about 130°

C. to about 180°

C.

19. The method of claim 17, wherein the heating may be to about 150°

C.

20. An apparatus for the preparation of gas mixtures, comprising:

a reducing component gas delivery bank for delivering at least one of a plurality of gasses, and comprising;

at least one gas source for receiving at least one reducing component gas;

at least one control valve operable on the at least one reducing component gas;

at least one pressure regulator operable on the at least one reducing component gas;

a plurality of mass flow controllers operable on the at least one reducing component gas; and

at least one output for outputting the at least one reducing component gas;

an oxidizing component gas delivery bank for delivering at least one of a plurality of gasses, and comprising;

at least one gas source for receiving at least one oxidizing component gas;

at least one control valve operable on the at least one oxidizing component gas;

at least one pressure regulator operable on the at least one oxidizing component gas;

a plurality of mass flow controllers operable on the at least one oxidizing component gas; and

at least one output for outputting the at least one oxidizing component gas;

at least one evaporation block suitable for adding H₂O to a mixture of the output at least one oxidizing component gas and the output at least one reducing component gas; and

wherein the ratio of the mixture is at least partially controlled by respective ones of the plurality of mass flow controllers.