Lean premixed combustion is the mainstream technology for low-pollution combustion of gas turbines. At present, the fuel-air premixer of gas turbine combustors adopts swirl mixing technology, and there are large premixers, poor uniformity, and uncontrolled tempering. Limiting defects such as fuel adaptability has become a bottleneck for technological development. The Clean Combustion Scientific Research Team of the Light Power Laboratory of the Institute of Engineering Thermophysics, Chinese Academy of Sciences based on long-term theoretical and technical research in 2011 proposed an array of vortex-mixing models and design concepts: modified swirl mixing for the spoiler forced blending With a special shape of spoiler, the controllable array of trapped vortex flow is constructed, which can effectively suppress the tempering and hanging fire while strengthening the air transport and blending.
Theoretical analysis, numerical calculations and experimental studies show that the mixing strength of the vortex flow in the array is significantly higher than that of the swirling flow under the action of the backflow and stretching mechanism of the array, and the CH4 fuel gas and H2 molar concentration are within the operating range of the modern gas turbine.æ··åˆ 60% of the hydrogen-containing fuel gas and air mixing process is safe, no tempering and hanging fire; under the same flow resistance conditions, the array vortex premixer shorter than the cyclone premixer length 1/3, the uniformity of mixing is doubled, and the disturbance of the outlet air flow is significantly reduced.
In order to use the theoretical model for the development of low-polluting combustion technology, the research team applied for a Chinese invention patent for array vortex fuel-air premixer (an array vortex fuel-air premixer, ZL 2011 1 0380006. 2) and The United States Invention Patent (Air Fuel Premixer Having Arrayed Mixing Vanes For Gas Turbine Combustor, US2013/0133329 A1) was authorized in 2015 and 2016, respectively.
In the national “863†hydrogen-containing fuel gas turbine combustion research project undertaken by the scientific research team, the combustor test of arrayed vortex fuel-air premixed nozzles was completed, and a 60% H2-40N2 fuel gas lean premixed combustion was realized. With the inlet air of the combustion chamber at 410°C and the outlet temperature of 1,450°C, NO x ≯ 20 ppm @ 15% O 2 , and the other indexes are comparable to the same type of combustion chamber. At the same time, the arrayed vortex fuel-air premixer has also attracted the attention of many gas turbine manufacturers and was used for the development and testing of natural gas low-pollution combustion chambers. Preliminary results show that the results are in line with expectations.
Arrayed vortex premixed combustion technology can be widely used in low-pollution combustion of various gas turbines and gas-fired boilers, to improve the working stability and fuel adaptability of gas turbine combustion chambers, to design aeronautical gas turbine low-pollution combustion chambers, and to develop ultra-low gas boilers. Pollution combustion technology makes sense, and the scientific research team will actively promote the technology to industrialization.
The research and development of arrayed vortex premixed combustion technology has been supported by the National Natural Science Foundation of China, the national "863" project, the Chinese Academy of Sciences' instrument and equipment function development technology innovation project, and commissioned projects of many enterprises. Related research has published 10 papers in international and domestic journals such as FUEL, International Journal of hydrogen energy, Chinese Journal of Engineering Thermophysics, Chinese Journal of Electrical Engineering, and Combustion Science and Technology, at ASME TURBO EXPO 2013, The 10 papers were published at international conferences such as the 10th Asia-Pacific Conference on Combustion and the 2015 International Conference on Computer Science and Environmental Engineering.
Sz6745 Zoom Stereo Microscope ,Trinocular Stereo Microscope,Trinocular Stereo Zoom Microscope,Stereo Zoom Microscope With Digital Camera
Ningbo Beilun Kalinu Optoelectronic Technology Co.,Ltd , https://www.kalinueot.com