Large-Scale Mercury Control Technology Testing for Lignite-Fired Utilities - Oxidation Systems for Wet FGD

Steven A. Benson ; Michael J. Holmes ; Donald P. McCollor ; Jill M. Mackenzie ; Charlene R. Crocker ; Lingbu Kong ; Kevin C. Galbreath

关键词: ACTIVATED CARBON;    ADDITIVES;    CALCIUM BROMIDES;    CALCIUM CHLORIDES;    COMBUSTION;    COMMERCIALIZATION;    DESULFURIZATION;    EFFICIENCY;    ELECTROSTATIC PRECIPITATORS;    EPRI;    FLUE GAS;    GASES;    LIGNITE;    MAGNESIUM CHLORIDES;    MERCURY;    OXIDATION;   

DOI  :  10.2172/925511
RP-ID  :  None
PID  :  OSTI ID: 925511
Others  :  TRN: US200807%%405

美国|英语

来源: SciTech Connect

【 摘 要 】

Mercury (Hg) control technologies were evaluated at Minnkota Power Cooperative's Milton R. Young (MRY) Station Unit 2, a 450-MW lignite-fired cyclone unit near Center, North Dakota, and TXU Energy's Monticello Steam Electric Station (MoSES) Unit 3, a 793-MW lignite--Powder River Basin (PRB) subbituminous coal-fired unit near Mt. Pleasant, Texas. A cold-side electrostatic precipitator (ESP) and wet flue gas desulfurization (FGD) scrubber are used at MRY and MoSES for controlling particulate and sulfur dioxide (SO{sub 2}) emissions, respectively. Several approaches for significantly and cost-effectively oxidizing elemental mercury (Hg{sup 0}) in lignite combustion flue gases, followed by capture in an ESP and/or FGD scrubber were evaluated. The project team involved in performing the technical aspects of the project included Babcock & Wilcox, the Energy & Environmental Research Center (EERC), the Electric Power Research Institute, and URS Corporation. Calcium bromide (CaBr{sub 2}), calcium chloride (CaCl{sub 2}), magnesium chloride (MgCl{sub 2}), and a proprietary sorbent enhancement additive (SEA), hereafter referred to as SEA2, were added to the lignite feeds to enhance Hg capture in the ESP and/or wet FGD. In addition, powdered activated carbon (PAC) was injected upstream of the ESP at MRY Unit 2. The work involved establishing Hg concentrations and removal rates across existing ESP and FGD units, determining costs associated with a given Hg removal efficiency, quantifying the balance-of-plant impacts of the control technologies, and facilitating technology commercialization. The primary project goal was to achieve ESP-FGD Hg removal efficiencies of {ge}55% at MRY and MoSES for about a month.