Presentation
HCl And SO2 Mitigation With Dry Injection Of Trona Or Sodium Bicarbonate
The newly promulgated Boiler MACT as well as proposed Utility MACT regulations require HCl to be mitigated to extremely low concentrations. Most of existing air pollution control systems will probably not be enough to satisfy the very low limits. Dry injection of sodium bicarbonate or trona is a low-cost solution that can be applied to meet the new challenges.
In a dry sorbent injection system, sodium bicarbonate or trona is injected directly into hot flue gas. After injection, the sorbent is calcined into porous sodium carbonate. Its high surface area enables fast gas-solid reactions between acid gases (mainly HCl and SO2) and Na2CO3 to form NaCl and Na2SO4 which are collected by either electrostatic precipitators (ESP) or fabric filters. The dry injection systems with sodium bicarbonate in Europe have shown that over 99% of HCl and 95% of SO2 removal have been achieved.
This paper will describe the concept of dry sorbent Injection system with sodium bicarbonate or trona, performance data at several plants, and system design guidelines.
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