|タイトル||*平成29年度中間年報 水素利用等先導研究開発事業 大規模水素利用技術の研究開発 水素専焼対応型Ｄｒｙ Ｌｏｗ ＮＯｘ高温ガスタービンの研究開発|
|報告書年度||2017 - 2017|
|英文要約||The purpose of this research is development of hydrogen-fired dry low NOx combustor applicable to high temperature gas turbines for power producers of several hundred MW classes, in order to maximize utilization of hydrogen as secondary energy aiming at a long-term perspective such as 2030. By FY2018, we extract the task for achieving the basic design of cluster burner (multi-hole jet combustor) considered to be stable operation without flashback under the hydrogen-fired conditions, and conduct research and development necessary for solving those tasks. In the FY2016, we set the criteria that the fuel distribution must meet for a single nozzle (a minimum component of a cluster burner) for achieving both low-NOx emission performance and flashback resistance. In FY2017, the nozzle shape satisfying the criteria was developed by numerical analysis, and the fuel concentration distribution by non-combustion flow test was evaluated.
1.Analysis and verification of single nozzle
We studied the shape of single nozzle by CFD analysis under a non-combustion condition. We have found a single nozzle shape that can achieve both low NOx performance and flashback resistance by adjusting the fuel injection holes arrangement and inlet shape of single nozzle. Also in non-combustion flow tests, we have confirmed that this single nozzle shape satisfied both criteria of NOx emission and flashback tolerance.
2.Analysis and verification of scaled model burner
Combustion CFD analysis of the scaled model burner was carried out. When estimating NOx emission from this analysis result, it is expected that it will be sufficiently less than 50 ppm (15% O2). For the NOx emission measurement and the flashback tolerance verification by the combustion test in FY2018, we constructed hydrogen fuel supply line and designed test model burner.
3.Structural integrity verification of cluster burner for large-scale GTs
From the results of numerical analysis and non-combustion flow tests of the single nozzle, the fuel injection hole diameter and the number of holes which can achieve the optimum fuel concentration distribution were studied. These results were reflected in the nozzle specifications, and the basic design of the cluster burner nozzle was completed by determining fuel supply structure. Then, we created a schematic drawing of the combustor nozzle part.