Real-time burner efficiency control and monitoring

Patent metadata

Field	Value
Publication number	US-10041672-B2
Application number	US-201314109702-A
Country	US
Kind code	B2
Filing date	Dec 17, 2013
Priority date	Dec 17, 2013
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

A method for real-time burner monitoring and control of a flare system, including analyzing a flare gas and/or flare exhaust gas by one or more analytical techniques and determining the flare gas and/or flare exhaust gas composition. The method may also include an ash particle monitoring system. The method further includes an analytical control unit for real-time adjustment of process conditions.

First claim

What is claimed:

1. A real-time burner efficiency control and monitoring system, the system including:
a flow header configured to feed a multiphase flare mixture to the system;
a separator that is configured to receive the multiphase flare mixture from the flow header, and separate the multiphase flare mixture into two or more fractions including a gas fraction and a liquid fraction, wherein the separator separates the multiphase flare mixture based upon, at least in part, an efficiency of the flare system;
a valve, located downstream from the separator, configured to control the flowrate of the gas fraction exiting the separator;
a flare system, located downstream from the valve, for the handling and burning of the gas fraction;
an air supply unit for supplying oxidant gas, at an adjustable flowrate, to the flare system for gas fraction combustion;
a gas fraction sampling point downstream of the separator and upstream of the flare system for sampling the gas fraction prior to admixture with the oxidant gas;
an exhaust mixture sampling point downstream of the flare system for sampling an exhaust mixture from the flare system; and
an analytical control unit configured to compare the gas fraction sampled at the flare gas sampling point with the exhaust mixture sampled at the exhaust mixture sampling point and provide feedback, based on the comparison, to adjust at least one parameter of the separator.

2. The system of claim 1 , wherein the analytical control unit provides feedback for adjustment of at least one of the air supply flowrate, separator pressure, separator temperature, or valve position.

3. The system of claim 1 , further comprising:
one or more of ion mobility spectrometry, differential mobility spectrometry, isobaric sampling system, isothermal sampling system, gas chromatograph, or mass-spectroscopy for profiling of the gas fraction at the gas fraction sampling point.

4. The system of claim 1 , further comprising:
one or more of ion mobility spectrometry, differential mobility spectrometry, realtime optical spectrometry, gas chromatograph, or mass-spectroscopy for profiling of the exhaust mixture at the exhaust mixture sampling point.

5. The system of claim 1 , further comprising:
one or more feedback circuits for the analytical control unit to vary the air supply, valve, or separator parameters.

6. The system of claim 1 , wherein the flare system further comprises:
a gas fraction inlet;
an exhaust mixture outlet,
an oxidant gas inlet, and
a flare header containing at least one pilot flame.

7. The system of claim 1 , wherein the separator further comprises one or more of: a wet/dry gas separator, a liquid/gas hydrocarbon separator, and a water knock out separator.

8. The system of claim 1 , wherein the oxidant gas comprises one or more of: air, oxygen, and methane.

9. A method for a real-time burner efficiency control and monitoring system, the method including:
analyzing a flare exhaust mixture composition at an exhaust mixture sampling point downstream of a flare system;
identifying specific components in the flare exhaust mixture utilizing one or more of a chromatographic, spectrometric, or optical systems;
adjusting at least one parameter of an upstream flow separator based on the analysis of the flare exhaust mixture composition, wherein a valve is fluidly coupled to and between the flow separator and the flare system;
adjusting an oxidant supply flowrate to the flare system based on the analysis of the flare exhaust mixture composition, wherein the oxidant comprises one or more of air or oxygen or methane, and
wherein the at least one parameter of the upstream flow separator includes separator temperature and pressure.

10. The method of claim 9 , further comprising:
monitoring of one or more ash filtration units by at least one of light scattering or plane plate capacitors to estimate the size and/or amount of the ash particles present in the flare exhaust; and
adjusting an oxidant supply flowrate to the flare system or the at least one separator parameter in response to the amount of light scattered or voltage reading.

11. The method of claim 9 , wherein the one or more of chromatographic, spectrometric, or optical systems are calibrated for flare exhaust monitoring, and
wherein one or more of ion mobility spectrometry, differential mobility spectrometry, real-time optical spectrometry, gas chromatograph, or mass-spectroscopy are utilized for identifying components of the flare exhaust mixture.

12. The method of claim 9 , wherein an analytical control unit provides feedback for the adjustment of the at least one separator parameter and oxidant supply flowrate to the flare system based on the identified composition of the flare exhaust mixture or at least one gas fraction of a multiphase flare mixture supplied to the flow separator.

13. A method for a real-time burner efficiency control and monitoring system, the method including:
feeding a flare mixture to the system through a flow header;
separating the flare mixture received from the flow header into one or more fractions in a separator, the one or more fractions including a gas fraction;
feeding the gas fraction to a valve, located downstream of the separator, configured to control the flowrate of the gas fraction exiting the separator;
burning the gas fraction in a flare system downstream from the valve;
analyzing a flare exhaust mixture composition at an exhaust mixture sampling point downstream of the flare system;
identifying specific components in the flare exhaust mixture utilizing one or more of a chromatographic, spectrometric, or optical systems;
analyzing the gas fraction at a gas fraction sampling point downstream of the separator and upstream of the flare system;
monitoring flare burner efficiency by differential composition analysis, between the gas fraction and flare exhaust mixture;
adjusting at least one parameter of the flow separator based on a comparison of results obtained at the gas fraction sampling point and the exhaust mixture sampling point; and
adjusting oxidant supply flowrate to the flare system, wherein the at least one separator parameter includes separator temperature and pressure.

14. The method of claim 13 , wherein specific components are identified in the gas fraction by utilizing one or more of a chromatographic, spectrometric, or optical systems.

15. The method of claim 13 , wherein differential composition analysis further comprises calibrating the one or more of chromatographic, spectrometric, or optical systems for flare exhaust mixture monitoring, and comparing samples taken from the gas fraction and the flare exhaust mixture sampling points in an analytical control unit.

16. The method of claim 13 , wherein an air supply unit supplies oxidant gas, at an adjustable flowrate, to the flare system for flare gas combustion.

17. The method of claim 15 , wherein the analytical control unit compares the results obtained at each sampling point and provides feedback for adjustment of at least one of oxidant supply flowrate to the flare system, separator pressure, separator temperature, or valve position.

18. The method of claim 15 , further comprising:
monitoring of ash filtration units by at least one of light scattering or plane plate capacitance to estimate the size and amount of the ash particles present in the flare exhaust mixture and controlling an oxidant supply flowrate or separator parameters in response to the amount of light scattered or voltage reading.

19. The system of

Assignees

• Schlumberger Technology Corp

Inventors

• Zhdaneev Oleg

Classifications

• F23N2223/00

  Signal processing; Details thereof · CPC title

• F23N2241/12

  Stack-torches · CPC title

• F23N2239/04

  Gaseous fuels · CPC title

• F23N5/003 Primary

  using detectors sensitive to combustion gas properties (F23N5/02, F23N5/18 - F23N5/26 take precedence) · CPC title

• F23G7/08

  using flares, e.g. in stacks · CPC title