@article{Rokhman_2017, title={Numerical analysis of various schemes for reconstructing the existing dust preparation system when changing the TР-100 steam generator operation from burning anthracite culm to burning gas coal}, url={https://ve.org.ua/index.php/journal/article/view/47}, abstractNote={<p>Three schemes for reconstructing the dust preparation system for<br>the boiler unit TP-100 for burning gas coal with respect to the<br>explosion safety of the dust system and the stability of the liquid<br>slag leakage from the tap of the combustion chamber of the<br>steam generator at a wide load regulation range of 120-200 MW<br>are studied. These schemes differ by the way of drying solid<br>fuel. It is shown that at air drying of coal it is not possible to<br>achieve a high level of explosion safety of the dust system even<br>when the standard temperature of the air mixture is within 70°C,<br>nor the unloading of the block below 140 MW, which is less<br>than the planned range of 120-200 MW, nor a large margin for<br>drying agent temperature by the condition of condensation of<br>water vapor. The interval of the boiler load changing of the unit<br>TP-100 using the gas-air drying scheme for coal is considerably<br>narrower than in the case of air drying. This is due to a decrease<br>in gas temperatures at the outlet from the zone of maximum heat<br>release and liquid slag, О2 concentration in the gas, and the burnout<br>efficiency of solid fuel due to the discharge of spent drying<br>agent loading with inert gases into the main burners. However,<br>the degree of explosion safety of the dust system (О2 (by<br>volume) &lt; 16%) and the temperature margin of the drying agent<br>by the condition of water vapor condensation at air-gas drying is<br>higher than that of air one. Of the three proposed options for<br>reconstructing the dust preparation system of the boiler unit TP-<br>100, the most efficient is the scheme for drying coal with flue<br>gases and discharging the drying agent into the cooled zone. This<br>scheme allows to organize a regime of stable liquidл slag<br>removal within the planned interval of load regulation of the<br>boiler unit TP-100 of 120-200 MW due to the following<br>measures: a) the thermal energy of the air is not consumed to<br>evaporate the moisture of the raw coal; b) dry coal is fed to the<br>zone of maximum heat release and inert gases are introduced<br>into it; c) a high degree purification from the dust in the spent<br>drying agent is provided. A high level of explosion safety of the<br>dust system is achieved by a low oxygen content in the drying<br>agent (О2 &lt; 10%). The proposed measures allow exceeding the<br>temperature of liquid slag above the temperature of normal<br>liquid ash removal at 113°C, which is much higher than at the air<br>and gas-air drying. This margin provides stable liquid</p&gt;}, number={2 (49)}, journal={Vidnovluvana energetika }, author={Rokhman, B.}, year={2017}, month={Jun.}, pages={6-16} }