Gas Turbine Combustor Narrowing Parts Partial Load CO
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
During partial load operations of gas turbines, the temperature of combustion gas is relatively low, leading to increased carbon monoxide generation due to delayed chemical reactions between carbon monoxide and carbon dioxide. This makes it difficult to lower the operating load of the gas turbine.
Innovation Solution
The gas turbine combustor features a combustion cylinder with narrowing parts on its inner wall surface, which are strategically positioned to guide combustion gas from the inner wall surface towards the central portion. This design includes a first region and a second region divided by a virtual plane, where the total projected area of narrowing parts in the second region is greater than in the first region, promoting more efficient gas flow and combustion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If narrowing parts are provided on the inner wall surface of the combustion cylinder to promote combustion by mixing combustion gas with high temperature gas, then carbon monoxide generation is suppressed during rated operation, but temperature deviation in the circumferential direction increases during partial load operation
Solution Approach 1:
The narrowing parts are strategically positioned only in the second region (downstream side) where temperature deviation is most pronounced, rather than uniformly distributing them throughout the combustion cylinder. This localized approach addresses the specific problem area without creating unnecessary temperature disturbances in other regions, thereby suppressing carbon monoxide generation while minimizing adverse temperature deviations during partial load operation
Solution Approach 2:
The configuration creates an asymmetric distribution of narrowing parts between the first region (upstream side) and second region (downstream side), with the second region having a larger total projected area of narrowing parts. This asymmetric arrangement compensates for the natural temperature gradient in the circumferential direction by providing enhanced mixing specifically where needed, rather than applying uniform treatment throughout
2Productivity
If the temperature of combustion gas is lowered during partial load operation, then operating load can be reduced, but carbon monoxide generation increases due to delayed chemical reactions
Solution Approach 1:
The narrowing parts are positioned upstream in the combustion cylinder to pre-mix the combustion gas with high-temperature gas before the combustion products reach the downstream region. This preliminary mixing action ensures that the chemical reactions between carbon monoxide and carbon dioxide occur more completely even when the overall combustion gas temperature is reduced during partial load operation, thereby allowing lower operating loads without increasing carbon monoxide emissions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively suppresses carbon monoxide generation even during partial load operations by ensuring uniform temperature distribution and promoting complete combustion of gases within the gas turbine combustor.
Implementation Method 1
a plurality of narrowing parts 71 that are provided on an inner wall surface 20i of the combustion cylinder 20 at intervals in a circumferential direction and that protrude toward the inner side of the combustion cylinder 20
Implementation Method 2
a combustion region 20a through which combustion gas generated by combustion of a fuel is allowed to flow
Implementation Method 3
the timing at which the carbon monoxide (CO) contained in the combustion gas chemically reacts with the carbon dioxide (CO2)
Data Source
AI summary
A gas turbine combustor according to at least one embodiment of the present disclosure includes a plurality of narrowing parts that protrude toward the inside of a combustion cylinder. The center axis of the combustion cylinder includes an upstream center axis, which linearly extends in an upstream region of the combustion cylinder, and extends in an ejection part in a direction that is different from the extension direction of the upstream center axis. The combustion cylinder includes a first region and a second region that are divided by a virtual plane which includes the center axis from the upstream region to the ejection part and which is orthogonal to a virtual flat plane that includes the center axis from the upstream region to the ejection part. A straight line obtained by extending the upstream center axis passes through the first region in the ejection part. The total value of projected areas of the narrowing parts present in the second region as viewed from the extension direction of the center axis is larger than the total value of projected areas of the narrowing parts present in the first region as viewed from the extension direction of the center axis.