| Abstract |
The report gives results of a test program of dry limestone injection, demonstrated on a 150-Mw pulverized-coal-fired boiler at TVA's Shawnee Plant. The program included: equipment shakedown, dust distribution studies, process optimization, and long-term injection trails. It identified major process variables; evaluated distribution of lime dust in the boiler, effect of operating variables on distribution, and resulting effects on SO2 removal; evaluated the sensitivity of SO2 removal to key operating and process variables; evaluated conditions for optimum SO2 removal; studied process effects on boiler operation and maintenance, on solids collection equipment, and on water quality; and completed a process economics study. The program is discussed in context with previous investigations and EPA-sponsored support activities. Appendices contain test program detail results and results of EPA support projects. Because of low SO2 removal efficiencies and the potential for major reliability problems, it does not appear that dry limestone injection will play an important role in controlling SO2 emissions from power plants. |
