FGD system design
Abstract
This paper describes the background of flue gas desulphurization technology, the type of flue gas desulphurization technology and classification; flue gas desulphurization and the physical and chemical principles of principle; process (from flue gas in semi-circle suspension of purification devices into the circulation suspended flow at the bottom Bed desulfurizer. Absorbent Ca (OH) 2 after jet pump into the desulfurization tower, fluidized gas and the materials in the acidic substances such as sulphur dioxide in the desulfurization tower in a chemical reaction, and removed from most of Sulphur dioxide, the flue gas desulphurization at the top of the tower from exports into the bag filter to remove most fine ash, dust collector from the lowering of the fine ash particles and the majority of the air circulating into the chute desulfurization tower, a small amount of After row to lose gray ash devices efflux system. Purify the air with smoke from the chimney into the atmosphere); adopted by the Semi-desulfurization has the advantage of (long-life equipment, maintenance of a small amount of smoke and materials Contact a long time to reach full and desulfurization efficiency, control simple, not preservation, a good entrance adaptive changes in the concentration of sulphur dioxide gas, desulfurization by-product flow is good, easy to handle; desulfurizer utilization, desulfurization by-product emissions Less); described in detail PLC, DCS, FCS of their respective advantages and disadvantages of flue gas desulphurization system on the control system components (industrial control computer systems, PLC control systems, on-site control systems, data communication networks), the structure, function and performance Features, as well as the choice of control systems, thermal automation equipment selection and system software design, also summed up the last of this industry also present some of the problems and the industry trend of development.
Keywords:Semi-FGD PLC Semi-cycle suspension FGD Control System