Diesel exhaust analysis system and method of using the same

• US 6,079,251 A
• Filed: 02/17/1998
• Issued: 06/27/2000
• Est. Priority Date: 02/17/1998
• Status: Expired due to Fees

• Current Assignee: Noranda, Inc. (Glencore Plc)
• Original Assignee: Noranda, Inc. (Glencore Plc)
• Inventors: Gaultier, Philippe, Thibault, Donald, McGinn, Sean
• Primary Examiner(s): DOMBROSKE, GEORGE M
• Application Number:
  US09/024,865
• Time in Patent Office: 861 Days
• Field of Search: 73/23.31, 73/23.32, 73/118.1, 73/116, 73/117.2, 73/117.3, 73/23.33, 701/103, 701/104, 701/109
• US Class Current: 73/23.31
• CPC Class Codes: F01N 11/007 the diagnostic devices measuring oxygen or air concentration downstream of the exhaust apparatus
• CPC Class Codes: G01M 15/102 by monitoring exhaust gases
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

The present invention is concerned with a system and method for monitoring the exhaust emissions of combustion engines such as diesel engines equipment used in underground mining operations. The system comprises a gas analyzer capable of measuring the concentration of at least one exhaust gas from the exhaust emissions, the analyzer being coupled to a computer that processes the data collected from the gas analyzer. The processed data is then displayed to the operator on a computer screen, so that the monitoring is carried out in real time.

Claims

1. A method for monitoring the exhaust emissions of a combustion engine, the method comprising the steps of:

(a) inserting a gas probe in the exhaust system of the engine, the probe being coupled to a gas analyzer capable of measuring gas concentration in the exhaust emissions of the engine, the gas analyzer comprising at least one gas sensor for sensing at least one gas;

(b) running the engine at operating temperature, and stabilizing the exhaust gas temperature to a maximum value with a 60 second engine stall-smoke density test;

(c) initiating data collection from the gas analyzer for a period of time and at a rate sufficient to obtain a substantially constant concentration of gas measured in the exhaust emissions; and

(d) processing the data collected in step (c) with processing means coupled to the gas analyzer, and displaying processed data in real time on display means coupled to the processing means, thereby allowing an operator to follow data collection and exhaust emissions monitoring through a progress window; and

(e) storing the processed data in storing means.

2. A method according to claim 1 wherein in step b), the engine is run at full throttle, full converter and hydraulic stall conditions.

3. A method according to claim 2 wherein full throttle, full converter and hydraulic stall conditions are maintained during data collection in step c).

4. A method according to claim 1 wherein in step c, data is collected at a frequency not less than every 2 seconds for 60 seconds.

5. A method according to claim 1 wherein the gas analyzer can measure exhaust gas temperature and pressure.

6. A method according to claim 1 wherein the gas analyzer further comprises processing means to calculate carbon dioxide concentration, total nitrogen oxides concentration, sulphur dioxide concentration, combustion efficiency, and lambda.

7. A method according to claim 1 wherein the gas is carbon monoxide, carbon dioxide, nitrogen oxide, nitrogen dioxide, oxygen, sulphur dioxide, hydrocarbons and combinations thereof.

8. A system for monitoring steady-state exhaust emissions of a combustion engine, the system comprising:

(a) a gas analyzer for measuring the concentration of at least one exhaust gas from the exhaust emissions of an engine that is running at operating temperature, and wherein the temperature of the exhaust gas has been stabilized to a maximum value with a 60 second engine stall smoke density test, the gas analyzer comprising a gas probe to be inserted in the exhaust system and coupled thereto, the analyzer further comprising at least one gas sensor for sensing at least one exhaust gas;

(b) processing means for processing data collected from the gas analyzer; and

(c) display means coupled to the processing means to allow an operator to follow data collection in real time and to monitor exhaust emissions through a progress window;

wherein the processing means and display means are used to create custom functions using the data collected from the gas analyzer.

9. A system according to claim 8 wherein the gas analyzer can measure exhaust gas temperature and pressure.

10. A system according to claim 8 wherein the gas is carbon monoxide, carbon dioxide, nitrogen oxide, nitrogen dioxide, oxygen, sulphur dioxide, hydrocarbons and combinations thereof.

11. A system according to claim 8 wherein the gas analyzer further comprises processing means to calculate carbon dioxide concentration, total nitrogen oxides concentration, sulphur dioxide, combustion efficiency and lambda.

12. A system according to claim 8 further comprising storing means for storing data processed in step b).

13. A system according to claim 8 wherein the engine is running at full throttle, full converter and hydraulic stall conditions.