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Method and device for gas measurement in a combustion chamber

A combustion chamber, gas measurement technology, applied in measurement devices, control of combustion, measurement of heat, etc., can solve problems such as the inability to provide spatial distribution of gas concentration or temperature, and inhalation pyrometry can not provide real-time tools for spatial distribution, etc. Achieve high spatial resolution

Active Publication Date: 2015-12-23
VATTENFALL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, inhalation pyrometry does not provide an efficient method for determining the spatial distribution of gas concentrations or temperatures in combustion systems
In particular, inhalation pyrometry does not provide real-time tools for determining the spatial distribution of gas concentrations and / or gas temperatures

Method used

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  • Method and device for gas measurement in a combustion chamber
  • Method and device for gas measurement in a combustion chamber
  • Method and device for gas measurement in a combustion chamber

Examples

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Embodiment Construction

[0035] The present invention is generally based on the inventor's recognition that light can be used to determine the condition of a gas and the location of that condition in a chamber or conduit that contains the gas and within which it can flow.

[0036] In particular, the inventors have realized that Light Detection and Ranging (LIDAR) technology can be used to determine the condition of a gas and its location in a chamber.

[0037] LIDAR technology can generally be used to measure the physical or chemical properties of gases or aerosols. Lasers are commonly used for LIDAR measurements due to their coherence and narrow beams.

[0038] LIDAR technology typically uses pre-defined laser pulses for ranging, i.e. localizing the pulse by determining the travel time of the laser light as well as the travel time of the (back)scattered light. In turn, the pulse length can determine the minimum spatial resolution.

[0039]When the laser light collides with a molecule, a portion of ...

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Abstract

The invention relates to a method of determining at least one gas condition at a location in a combustion chamber of a power plant or a cogeneration plant by means of laser pulses. The method comprises emitting (S1) a laser pulse into a chamber, determining (S2) a first point in time when said laser pulse is emitted into the chamber, detecting (S3) a laser pulse at said position in the chamber The laser light backscattered by the gas molecules, determine (S4) the second time point when the laser light backscattered by the gas molecules is detected, based on the first time point, the second time point and the pulse length of the laser pulse ( S5) said location, and based on at least one characteristic of the backscattered laser light detected at the second point in time, determining (S5) at least one gas condition at the location. A gas measurement system and combustion system are also described herein.

Description

technical field [0001] The present application relates generally to gas measurement, and in particular to methods and apparatus for determining the condition of a gas and its location in a chamber. Background technique [0002] In general, it may be desirable to know the properties of gases flowing in a combustion system, such as in a boiler used to generate steam in a power plant. In particular, it may be desirable, for example, to determine the gas temperature at various locations within the combustion system. By determining the local temperature of the gas, it is possible to control the gas flow or fuel distribution so that the temperature of the gas is optimally distributed as it flows through the combustion system. Optimum combustion and minimum losses in the combustion system can thus be achieved. [0003] One way of measuring temperature in a combustion system is with thermocouples mounted on the inside of the combustion chamber. However, in this way each thermocou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23N5/08G01K11/12G01N21/53G01N21/65G01K11/324
CPCF23N5/02F23N5/082G01N21/53G01N21/65G01N2021/4709G01N2201/0697G01K11/125G01K11/322G01N21/47G01N21/39F23N5/08G01N21/3504G01N21/63G01N21/51
Inventor S·巴迪埃M·伯格
Owner VATTENFALL
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