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Title: Flue gas desulfurization method and apparatus

Abstract

A combined furnace limestone injection and dry scrubber flue gas desulfurization (FGD) system collects solids from the flue gas stream in first particulate collection device located downstream of an outlet of a convection pass of the furnace and upstream of the dry scrubber. The collected solids are diverted to the dry scrubber feed slurry preparation system to increase sulfur oxide species removal efficiency and sorbent utilization. The level of lime in the feed slurry provided to the dry scrubber is thus increased, which enhances removal of sulfur oxide species in the dry scrubber. The decreased particulate loading to the dry scrubber helps maintain a desired degree of free moisture in the flue gas stream entering the dry scrubber, which enhances sulfur oxide species removal both in the dry scrubber and downstream particulate collector, normally a baghouse.

Inventors:
 [1];  [2]
  1. (Canfield, OH)
  2. (Washington Township, Stark County, OH)
Publication Date:
Research Org.:
Babcock and Wilcox Co
Sponsoring Org.:
USDOE
OSTI Identifier:
871782
Patent Number(s):
US 5795548
Application Number:
08/611605
Assignee:
McDermott Technology, Inc. (New Orleans, LA) NETL
DOE Contract Number:
AC22-92PC92160
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
flue; gas; desulfurization; method; apparatus; combined; furnace; limestone; injection; dry; scrubber; fgd; collects; solids; stream; particulate; collection; device; located; downstream; outlet; convection; pass; upstream; collected; diverted; feed; slurry; preparation; increase; sulfur; oxide; species; removal; efficiency; sorbent; utilization; level; lime; provided; increased; enhances; decreased; loading; helps; maintain; desired; degree; free; moisture; entering; collector; normally; baghouse; oxide species; particulate collector; located downstream; gas desulfurization; sulfur oxide; collection device; dry scrubber; feed slurry; gas stream; flue gas; sorbent utilization; scrubber flue; slurry preparation; stream entering; removal efficiency; device located; desired degree; free moisture; combined furnace; collects solids; particulate collection; furnace limestone; desulfurization method; limestone injection; /422/96/110/

Citation Formats

Madden, Deborah A., and Farthing, George A. Flue gas desulfurization method and apparatus. United States: N. p., 1998. Web.
Madden, Deborah A., & Farthing, George A. Flue gas desulfurization method and apparatus. United States.
Madden, Deborah A., and Farthing, George A. 1998. "Flue gas desulfurization method and apparatus". United States. doi:. https://www.osti.gov/servlets/purl/871782.
@article{osti_871782,
title = {Flue gas desulfurization method and apparatus},
author = {Madden, Deborah A. and Farthing, George A.},
abstractNote = {A combined furnace limestone injection and dry scrubber flue gas desulfurization (FGD) system collects solids from the flue gas stream in first particulate collection device located downstream of an outlet of a convection pass of the furnace and upstream of the dry scrubber. The collected solids are diverted to the dry scrubber feed slurry preparation system to increase sulfur oxide species removal efficiency and sorbent utilization. The level of lime in the feed slurry provided to the dry scrubber is thus increased, which enhances removal of sulfur oxide species in the dry scrubber. The decreased particulate loading to the dry scrubber helps maintain a desired degree of free moisture in the flue gas stream entering the dry scrubber, which enhances sulfur oxide species removal both in the dry scrubber and downstream particulate collector, normally a baghouse.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1998,
month = 8
}

Patent:

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  • A combined furnace limestone injection and dry scrubber flue gas desulfurization (FGD) system collects solids from the flue gas stream in first particulate collection device located downstream of an outlet of a convection pass of the furnace and upstream of the dry scrubber. The collected solids are diverted to the dry scrubber feed slurry preparation system to increase sulfur oxide species removal efficiency and sorbent utilization. The level of lime in the feed slurry provided to the dry scrubber is thus increased, which enhances removal of sulfur oxide species in the dry scrubber. The decreased particulate loading to the drymore » scrubber helps maintain a desired degree of free moisture in the flue gas stream entering the dry scrubber, which enhances sulfur oxide species removal both in the dry scrubber and downstream particulate collector, normally a baghouse. 5 figs.« less
  • A combined furnace limestone injection and dry scrubber flue gas desulfurization (FGD) system collects solids from the flue gas stream in first particulate collection device located downstream of an outlet of a convection pass of the furnace and upstream of the dry scrubber. The collected solids are diverted to the dry scrubber feed slurry preparation system to increase sulfur oxide species removal efficiency and sorbent utilization. The level of lime in the feed slurry provided to the dry scrubber is thus increased, which enhances removal of sulfur oxide species in the dry scrubber. The decreased particulate loading to the drymore » scrubber helps maintain a desired degree of free moisture in the flue gas stream entering the dry scrubber, which enhances sulfur oxide species removal both in the dry scrubber and downstream particulate collector, normally a baghouse. 5 figs.« less
  • A combined furnace limestone injection and dry scrubber flue gas desulfurization (FGD) system collects solids from the flue gas stream in first particulate collection device located downstream of an outlet of a convection pass of the furnace and upstream of the dry scrubber. The collected solids are diverted to the dry scrubber feed slurry preparation system to increase sulfur oxide species removal efficiency and sorbent utilization. The level of lime in the feed slurry provided to the dry scrubber is thus increased, which enhances removal of sulfur oxide species in the dry scrubber. The decreased particulate loading to the drymore » scrubber helps maintain a desired degree of free moisture in the flue gas stream entering the dry scrubber, which enhances sulfur oxide species removal both in the dry scrubber and downstream particulate collector, normally a baghouse.« less
  • Flue gas from a coal-fired combustion to which a dry sulfur-binding additive is supplied, after cooling is subjected to filtration to remove additive ash therefrom. According to the invention, cooled additive ash is fed to at least a portion of the flue gas to reduce the temperature thereof approximately to the water dewpoint, thereby promoting the sulfur-binding reaction.
  • A method of desulfurizing boiler flue gas by intimate contact thereof with dry particles of a reactant or absorbent, such as hydrated lime, preferably with recirculation of the flue gas and entrained reactant or absorbent particles. An apparatus suitable for carrying out the method comprises an upstanding conduit defining a vertical gas flow path in communication with a source of SO2-and particulate-laden flue gas, a conveyor for introducing a dry reactant or absorbent into the gas flow path, and a rotatable slinger mounted within the gas flow path for uniformly distributing the reactant or absorbent thereacross. In its preferred form,more » the apparatus includes recirculation means, preferably an eductor, mounted above the slinger for recirculation of gas and entrained reactant or absorbent within the gas flow path to enhance gas-solid contact time, a tangential gas inlet for creating vortical gas flow within the conduit, a gas expansion section at the conduit's discharge end and means for reversing the gas flow direction to enhance separation of particulates.« less