MERCURY CONTROL WITH CALCIUM-BASED SORBENTS AND OXIDIZING AGENTS

Gale, Thomas K.

National Energy Technology Laboratory (U.S.)

关键词: Sorbent Injection Processes;    Boilers;    Oxidizers;    01 Coal, Lignite, And Peat;    Demetallization;   

DOI  :  10.2172/801218
RP-ID  :  FC26-01NT41183--01
RP-ID  :  FC26-01NT41183
RP-ID  :  801218

美国|英语

来源: UNT Digital Library

【 摘 要 】

The initial tasks of this DOE funded project to investigate mercury removal by calcium-based sorbents have been completed, and initial testing results have been obtained. Mercury monitoring capabilities have been obtained and validated. An approximately 1MW (3.4 Mbtu/hr) Combustion Research Facility at Southern Research Institute was used to perform pilot-scale investigations of mercury sorbents, under conditions representative of full-scale boilers. The initial results of ARCADIS G&M proprietary sorbents, showed ineffective removal of either elemental or oxidized mercury. Benchscale tests are currently underway to ascertain the importance of differences between benchscale and pilot-scale experiments. An investigation of mercury-capture temperature dependence using common sorbents has also begun. Ordinary hydrated lime removed 80 to 90% of the mercury from the flue gas, regardless of the temperature of injection. High temperature injection of hydrated lime simultaneously captured SO{sub 2} at high temperatures and Hg at low temperatures, without any deleterious effects on mercury speciation. Future work will explore alternative methods of oxidizing elemental mercury.