DURABILITY OF BOILER ELEMENTS IN KRASNODAR THERMAL POWER PLANT
The article contains methodology analysis of elements’ durability of boiler units, evidence from Krasnodar thermal power plant (TPP). The transition of the evaporation section of the direct-flow steam generator to the super heater is characterized by the most complex processes of hydrodynamics and heat transfer. In this zone there is a change in the nature of the flow - the transition from a two-phase state to a single-phase one. In this case, the structure of the two-phase flow (due to hydrodynamics instability) undergoes some changes: the flow can have a different structure. For the calculation, we use the results of experimental studies of the temperature regime of the inlet section of the steam super heat channel (SSHC) with the pre-activated unheated area with low humidity in the saturated vapor at the inlet of y<sub>0</sub> = 1,3 % at a pressure of P = 6.9 MPa, specific mass flow rates are: ρw = 1150 kg / m<sup>2</sup>s and the heat flux density is q = 0.49 MW / m<sup>2</sup>. The movement of steam in a vertically located working area is upward. The experiments were carried out on a direct-flow steam-water stand, whose power which supplied by water and steam from a high-pressure steam generator. Corrosion has a particular effect on the durability of the structure with temperature fluctuations. The most reliable method to determine longevity under temperature pulsations is resource testing in field conditions. However, with regard to the elements of power equipment, this method is practically unsuitable, since at a high cost of testing their results, we would have to wait for several years. Currently, estimations of the resource are used with a particular model; or individual experiments are conducted, most often they have illustrative nature, where temperature pulsations are usually created artificially.