Evaluation of the Limestone Dual Alkali Prototype System at Plant Scholz: Final Report

摘要

The report gives results of a 2-month test (February/March 1981) of the limestone dual alkali process at an existing 20 MW prototype facility at Gulf Power Company's Scholz Steam Plant. The project was intended to evaluate the technical feasibility of the process at a prototype scale and to develop sufficient technical information leading to the implementation of the process at a full commercial scale. Due to budgetary limitations, the test was reduced from 6 to 2 months. Although the technology appears to be technically feasible, further testing is necessary before a conclusive evaluation is made; some refinement of the process is still needed. Excellent SO2 removal efficiencies (over 95%) were achieved; limestone utilizations were also high, over 97%. The solids properties ranged from excellent to poor. The generation of poor solids was the most significant process problem. The solids content in the filter cake ranged from 35 to 45% (below the anticipated 55%). The soda ash consumption of 0.29 moles of Na2C03/mole of SO2 removed far exceeded the design consumption of 0.04 moles. Much of this consumption was due to leaks and other liquor losses in the system.