Seawater Flue Gas Desulphurization Technology And Engineering Application In Power Station

At present,more than 90% of great power plant units take Wet-limestone FGD (WLST-FGD)process, this article introduces another seawater FGD (SWFGD)process which also belongs to wet FGD technology and is developed by Dongfang boiler independently. We developed this new process and apply it into the FGD project for xiamen songyu 4×300MW power plant by refering foreign seawater technology, absorber type and according to the seawater's feature of weak alkalescence and sbsorbing acid gas. This seawater FGD process utilize the seawater from condensator as absorbent to get rid of SO2 emissioned from power plant, and the acid seawater after FGD process is discharged into ocean directly, there is no any additive during FGD process.This system take spray empty absorber, optimizing the airflow, fully mixing the flue gas and seawater so as to ensure high efficiency transferring and more than 95% De-Sox efficiency; the feeding of spray seawater depends on both the mother pipes and cell pipes which can improve the load adaptability of FGD system as well as ensure De-Sox efficiency and save energy. The acid seawater from FGD absorber is dicharges by gravity, the recover system for seawater mainly take aeration pool and controlling the pH value of seawater more than 6.8 by providing reasonable aeration time and gas flow. This process has been put into xiamen songyu 4×300MW power plant and the running test result shows that this process is successful and reaches advanced level in the world.Comparing to present widely used WLST-FGD process, seawater-FGD process has the advantage of high De-Sox efficiency, lower running cost, lower investment, simple system, no additive and no byproduct etc. it is a better choice for domestic and southeast asia projects which is closed to seaside to take seawater-FGD process.