Dual Circulating Fluidized Bed Flue Gas Desulfurization Technology In A 100mw Unit

The acid rain caused by SO₂ emission from coal-fired power plants has seriously impacted humans living environment, and the installation of flue gas desulfurization (FGD) apparatus upon power plants has been enforced in China. In contrast with dyr FGD process, however, there are many problems such as higher cost, higher operation expenses and waste water pollution in the wet flue gas desulfurization which is being used. So, those FGD techniques with high efficiency and availability, simple procedures and low power consumption, low investments and costs have to be developed, and semi-dry FGD methods arise as a result.Firstly, this paper describes several methods that are relatively mature and commercially are running on a large scale at home and abroad, and analyzes their technical characteristics.The DCFB-FGD (Double circulating fluidized bed flue gas desulfurization) technology has great advantages of being cheap, lower investment, lower operation cost, lower energy consumption, smaller size, and dry product over other process.The main part of this paper is the design and calculation of DCFB-FGD technology on the 100MW unit of YanTai Power Plant. At present, lime slurry is usually used as sorbent of semi—dry CFB-FGD to spray into the tower at the venturi fluidized equipment after atomization. But there are many problems in operation such as atomizer choke, slurry deposition. To overcome these dis advantages, lime and water was sprayed respectively, but the desulfurization efficiency will decline a little. It can meet the emission standards with this technology after taking appropriate measures in design when the low sulphur coal is used.After the DCFB-FGD technology was operated on the 100MW unit of YanTai Power Plant, the emission concentration of SO₂ can fulfill the emission...