Wobbe index sensor system

A Wobbe index and sensor technology, applied in the field of monitoring gas turbine engine systems, can solve problems such as micro-hot plate breakage, micro-hot plate failure, high stress, etc.

Inactive Publication Date: 2009-01-14
GENERAL ELECTRIC CO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because the hotplate operates at high temperatures, the temperature expansion coefficients of the dissimilar materials that make up the hotplate can cause high stresses that can lead to failure of the hotplate
Additionally, these devices may be structurally prone to fracture due to the high residual stresses induced by the micro-hotplate during fabrication

Method used

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Examples

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Embodiment Construction

[0014] As discussed in detail below, one embodiment of the present invention includes a sensor for measuring the Wobbe Index and lower heating value (LHV) of a fuel. Although the current discussion focuses on sensors for gas turbine engines used in industrial environments, the system is not limited to gas turbines but is applicable to other applications such as measurement of fuel quality in jet engines or measurement of fuel composition in pipelines . Furthermore, the principles and knowledge presented herein are applicable to various gaseous and liquid fuels such as, but not limited to, natural gas, gasoline, kerosene, diesel fuel, and jet fuel.

[0015] Now turning to the attached image, figure 1 is a cross-sectional view of sensor 10 for measuring Wobbe Index and LHV of fuel. Sensor 10 includes a substrate 12 . In a particular embodiment, substrate 12 includes a silicon substrate. An insulating layer 14 is provided on the substrate 12 . In one example, insulating laye...

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Abstract

The present invention relates to a Wobbe index sensor system and a sensor (10) for measuring Wobbe index of a fuel. The sensor (10) includes a substrate (12) and a diaphragm layer (16). The diaphragm layer (16) includes a first layer (18) having at least one heating element configured to sense energy content in a fuel, wherein the heating element includes a doped poly-silicon carbide that is disposed on the substrate (12). The diaphragm layer (16) also includes a second layer (22) including an undoped poly-silicon carbide layer configured to prevent oxidation of the first layer (18). The sensor (10) further includes a sensing layer (22) having a catalyst suspended in a support structure. The sensor (10) also includes a cavity formed under the diaphragm layer (16) and is configured to provide thermal isolation of the heating element.

Description

technical field [0001] The present invention relates generally to monitoring gas turbine engine systems, and more particularly to a system for measuring lower fuel heating value and Wobbe Index. Background technique [0002] There is an increasing demand for gas-fired combustion systems that can readily operate on liquefied natural gas (LNG), blends of pipeline natural gas and LNG, and various low BTU (British thermal unit) fuels . Therefore, there is a need for a system that can determine the lower fuel heating value or Wobbe Index to ensure that the engine characteristics match those of the fuel. [0003] One of the common systems for determining the Wobbe Index includes a gas chromatograph (GC) system. GC systems include a glass capillary system to separate fuel components, and a thermal conductivity detector or flame ionization detector (FID) to quantitatively identify the components. However, the measurements provided by the GC system are not continuous, but at inter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/12G01N33/22
CPCG01N33/225G01N27/16F01D25/00F02C9/00G01N25/18G01N25/22
Inventor A·J·克诺布洛赫W·J·小安特尔M·G·克里斯托福罗R·M·奥伦斯坦
Owner GENERAL ELECTRIC CO
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