tailieunhanh - Advances in Gas Turbine Technology Part 6

Tham khảo tài liệu 'advances in gas turbine technology part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 140 Advances in Gas Turbine Technology influence mainly the superheater of the heat recovery steam generator with effects on temperature flow rate etc. . The design of the gas turbine - afterburning installation - heat recovery steam generator system must take into account these variables for insuring the steam parameters required by the technological process. The active control of the combustion is a concept already accepted and the new generation of afterburning installations will need to answer to the requirements of the new smart aggregates which automatically take into account the emissions the energetic efficiency and the process requirements PIER 2002 . For that purpose the researches conducted at Suplacu de Barcau 2xST 18 Cogenerative Power Plant has focused on the afterburning installation as integral part of the cogenerative group in terms of stack emissions superficial temperature profile and power quality Barbu et al. 2010 as well as on its interaction with the heat recovery steam generator. 2. General principles of the mathematical modelling of the thermo-gasdynamic and chemical processes in the combustion chambers The classical approach of the combustion chambers study assumes as a general rule the embracing of a steady character of the phenomena taking place in these installations constituting only a quasi-adequate manner to the problem of analysing the unsteady phenomena generating important collateral effects. The physical-chemical phenomena succeeding in the combustion chamber are extremely complex each of them injection atomization vaporization diffusion combustion rigorously depending on the physical factors such as air excess gases pressure temperature and velocity in the chamber. It may be admitted that the combustion is normal as long as the fluctuations detected in the combustion chamber only depend on the local conditions and they are randomly distributed in the chamber. The high level of complexity of the phenomena associated to the flow .