Formation of an axisymmetric swirling flow in a cyclone-vortex pre-heating with a capacity of 65 MW

The article presents power facilities with boiler equipment equipped with cyclone-vortex preheaters with a capacity of 65 MW. The design differences of cyclone-vortex preheaters with one- sided and four-sided supply of gaseous fuel to the combustion chamber are considered. The principle of operation of the cyclone-vortex pre-heating, the features of the distribution of air and gas media in the combustion chamber of the cyclone-vortex pre-heating are described. The article presents a diagram of the location of experimental sections in cyclone-vortex pre-furnaces for conducting pneumometric studies, a list of parameters measured during research is given, information on the modes and loads of boilers during research is given. The results of pneumometric studies are presented. Graphs of changes in the parameters of the swirling flow in cyclone-vortex preheaters during gorenje and without gorenje of natural gas are given. The influence of one-sided and four-sided input of natural gas into the combustion chamber of cyclone-vortex pre-heating on the formation of a symmetrical swirling flow is estimated.A comparative analysis of the parameters of the swirling flow showed the magnitude of the deviation of the aerodynamic axis of the swirling flow from the geometric axis of the combustion chamber of the cyclone-vortex pre-tank. According to the profile of the change in the tangential component of the full velocity vector, the regions of the formation of a swirling flow during combustion and without gorenje gorenje gas in the combustion chamber of the cyclone-vortex pre-heating are marked. The influence of axial air input on the combustion process and the temperature change of the swirling flow is revealed. Gorenje Analysis of data on oxygen content and temperature values of the «hot» flow showed the areas of gorenje and the areas of mixing of air and gas in the combustion chamber of the cyclone-vortex pre-heating. The presented conclusions indicate that the uniform distribution of gas through all tangential air inlets during the combustion process allows to intensify the heat and mass exchange of fuel and air and achieve almost complete combustion of gas in the volume of the combustion chamber of cyclone- vortex pre-heating with subsequent gorenje in the boiler furnace.