Dry Sorbent Circulating Reactor System for Removing Acid Gas Pollutants Emissions from Power and Incineration Utilities

Abstract

Dry type acid gas pollutants removal processes offer the significant advantages of low capital and operating costs when compared to wet type acid gas removal processes. They hold great potential for the economical reduction of SO2 and HCl emissions from power and incineration utilities that use high-sulfur coal and high halide base acids wastes. One of the project's major goals was the development of dry, calcium-based sorption processes for removing sulfur dioxide and hydrogen chloride from the combustion gases and incineration gases produced by high-sulfur coal and high halide base acids wastes. Dry sorbent circulating reactor system for flue gas cleaning highlights a number of experimental research findings that have had a significant and lasting impact in term of scientific understanding. For example, the experimental investigation in demonstration test unit SO2 and HCl capture by dry sorbent obtained removal efficiency more than 99%, thereby revealing the well fluid mixing with sorbent and flue gas and longer residence time in the reactor. The average HCl concentration at the inlet of the reactor maintained at 878 ppm. The HCl removal efficiency maintained at over 99.9%, and the HCl emission concentration maintained at below 5 ppm under the conditions that the flow amount of the flue gas was 40,000 Nm3/hr, the SR was below 2.0, and the pressure loss at the baghouse was 150 mmH2O. We also identified a number of important areas for future research, including reaction mechanisms, sorbent material, transport effects, simulation of particle fluid dynamics and efficient system development.