Why is the pressure difference of the EDV nozzle so high?
Thread Content
Generally, the pressure of desulfurization nozzles is 0.7 BAR, but according to available information, the pressure of the alkaline (NAOH) nozzles used in EDV is 2–2.5 BAR. I’m not sure why this is the case The atomization effect of nozzles at 0.7 BAR is more than sufficient to meet the requirements for desulfurization efficiency; then why is such a high pressure needed? It not only wastes energy but also increases the amount of mist carried along. Is it because the atomization effect of EDV nozzles is relatively poor?
The desulfurization processes are different; in the EDV method, the flue gas rotates at low speeds inside the tower, and a high liquid-to-gas ratio is used, so a very high operating pressure is not required. The nozzles used in desulfurization do not require high precision regarding atomization quality
Are there any application records of this process in China? How effective is it?
I only know what it is, but not why it is so. Although 0.7 BAR is sufficient for atomization purposes in terms of nozzles, it is necessary to ensure the flow rate of the circulating or absorbing fluid in order to keep the liquid-to-gas ratio within an appropriate range. Therefore, these operating conditions require that the pressure in front of the nozzle reach 2–2.5 BAR. However, based on practical operational experience, for the G400 model, a pressure of 3 BAR in front of the nozzle and a flow rate of 200 T/HR are necessary; for the F130 model, a pressure of 3.4 BAR in front of the nozzle and a flow rate of 14.5 T/HR are required. These conditions ensure the best atomization effect and the lowest possible pressure drop across the nozzle.