| The key of the thermal power plant FGD waste water with evaporation treatment is how to design atomizing nozzle. In order to increase the contact area of the droplets and flue gas, nozzle atomization fineness requirements higher. But due to the wastewater itself is not very clean, the market general atomization nozzle easy to clogging. Therefore, it is very significant to design a kind of spray nozzle which atomize well and can effectively prevent the clogging.Firstly, this paper design two kinds of atomization nozzle, its outlet diameter is 5mm, which can effectively prevent clogging. This kinds of atomization nozzle have a simple structure which convenient to replacement and easy to use in industry. This kinds of atomization nozzle compared with the traditional nozzle has two air atomization process, the atomization effect is better, the theoretical calculation of its spray particle diameter of 45.38 ?m, to meet the use requirements. Theoretical calculation of its spray particle size also meet the use requirements.Secondly, this paper test the two kinds of nozzles' atomization characteristics. Experiment is conducted to study the effects of different spray export deflection angle to atomization characteristics; the effects of different water flow rates and the compressed air pressure to atomization characteristics. The gas-liquid ratio under different flow and air pressure was also investigated. The results show that when spray export deflection angle is 15 °, the nozzle have a better atomization effect under the same conditions; The liquid flow rate decreased and the compression air pressure increased can lead atomization effect better, but the trend is getting smaller and smaller; The type of B nozzle spray effect is better than the type of A nozzle; Through fitting the air pressure and gas-liquid ratio experimental data at the different flow rate, the mathematical relationship between air pressure and gas-liquid ratio is received, which is convenient for industrial calculate gas-liquid ratio.Finally, this paper theoretical calculate and software simulate the engineering of 660 MW power plant FGD waste water with evaporation treatment. Through theoretical calculation and software simulation, it is concluded that: using the designed spray nozzle and selecting the appropriate layout point, 660 MW power plant FGD waste water with evaporation treatment can be very good to treat wastewater. The flue gas temperature decreased by the original 124 ? to 120?, cooling at 4 ?,which still higher than the acid dew point. Droplets evaporation distance is almost 5 m in flue, which can not lead the following equipment and flue corroded. |
PDF Full Text Request