IP Library › Granted Patent US 11,573,155
Granted Patent B2
US 11,573,155 · App. 16/703,949 · Granted Feb 7, 2023

Generation of nitrogen dioxide for use with burner-based exhaust replication system

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Quick Facts
Patent No.
US 11,573,155
App. No.
16/703,949
Filed
Dec 5, 2019
Granted
Feb 7, 2023
Kind
B2
Art Unit
3746
USPC
60/272
Abstract

A method of using a burner-based exhaust replication system to generate exhaust that contains nitrogen dioxide (NO 2 ). An example of such as system is a system used to test automotive exhaust aftertreatment devices. A fluid that decomposes to generate NO 2 as one of its decomposition products is selected. The fluid is heated thereby generating NO 2 , with the amount and duration of heating is controlled to result in a desired decomposition extent of NO 2 from the fluid. The fluid is then delivered to an exhaust stream of the system.

Claims (23)

1. A method of using a burner-based exhaust replication system to generate exhaust that contains nitrogen dioxide (NO 2 ), comprising:

selecting a fluid that decomposes to generate NO 2 as one of its decomposition products;

heating the fluid, thereby generating NO 2 ;

wherein the amount and duration of heating is controlled to result in a desired decomposition extent of NO 2 ;

delivering the NO 2 to an exhaust stream of the test system; and

metering the fluid prior to the heating step, or metering the NO 2 delivered to the exhaust stream, to provide a desired amount of NO 2 into the exhaust stream.

2. The method of claim 1 , wherein the fluid is nitric acid.

3. The method of claim 1 , wherein the heating step is performed in a decomposition reactor having a reduction catalyst.

4. The method of claim 1 , wherein the delivering step is performed using a heated conduit.

5. The method of claim 1 , wherein the desired amount of NO 2 is a proportion of a NO 2 :NOx ratio.

6. The method of claim 1 , further comprising using nitrogen as a carrier gas for the fluid.

7. An improved burner-based exhaust replication system, the exhaust replication system having an exhaust line that carries an exhaust stream as output of the test system, the improvements comprising:

a decomposition reactor, operable to receive a fluid that decomposes to generate NO 2 as one of its decomposition products and to heat the fluid, thereby generating NO 2 ;

a controller operable to control the amount and duration of heating to result in a desired decomposition extent of NO 2 ;

a conduit for delivering the NO 2 from the decomposition reactor to the exhaust stream of the test system; and

a meter upstream or downstream the decomposition reactor, operable to provide a desired amount of NO 2 into the exhaust stream.

8. The test system of claim 7 , wherein an exhaust aftertreatment device is installed on the exhaust line for testing, and wherein the conduit delivers the NO 2 upstream the exhaust aftertreatment device.

9. The test system of claim 8 , wherein the meter is upstream of the decomposition reactor, and wherein the controller controls the duration of heating by controlling the meter and thereby the residence time of the fluid in the decomposition reactor.

10. The test system of claim 8 , wherein the fluid is nitric acid.

11. The test system of claim 8 , wherein the decomposition reactor has a reduction catalyst.

12. The test system of claim 8 , wherein the conduit is heated.

13. The test system of claim 8 , wherein the desired amount of NO 2 is a proportion of a NO 2 :NOx ratio.

14. The test system of claim 8 , wherein the decomposition reactor is further operable to receive nitrogen as a carrier gas for the fluid.