Combustion method producing low levels of pollutants and apparatus for same
AssigneeElectric Power Research Institute, Inc.
InventorThomas J. Boyd
Life of this patent
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Abstract
A method for combusting a fossil material so as to produce an exhaust stream having a low level of pollutants. The fossil material is introduced into a fluidized bed combustor which is operated at a temperature of at least approximately 1775.degree. F. to produce a partially cleansed exhaust stream having a low level of N.sub.2 O. SO.sub.2 is removed from the partially cleansed exhaust stream outside of the fluidized bed combustor to produce a cleansed exhaust stream having a low level of SO.sub.2. An apparatus is provided for performing the method of the invention.
Claims16
A method for combusting a fossil material so as to produce an exhaust stream having a low level of pollutants comprising the steps of introducing the fossil material into a fluidized bed combustor having a chamber, operating the fluidized bed combustor chamber under at least stoichiometric conditions and at a temperature of at least approximately 1775.degree. F. to produce a partially cleansed exhaust stream having low levels of N.sub.2 O and CO and removing SO.sub.2 from the partially cleansed exhaust stream from the fluidized bed combustor chamber with a sorbent to produce a cleansed exhaust stream having a low level of SO.sub.2, the removal of the SO.sub.2 occurring outside of the fluidized bed combustor chamber to permit the fluidized bed combustor chamber to be operated at temperatures without regard to efficient sorbent utilization therein.
A method for burning coal so as to produce an exhaust stream having a low level of pollutants comprising the steps of combusting the coal in a fluidized bed combustor having a chamber maintained at a temperature of at least approximately 1775.degree. F. to produce a partially cleansed exhaust stream having low levels of N.sub.2 O and CO, removing SO.sub.2 from the partially cleansed exhaust stream with a sorbent in a scrubber located downstream of the fluidized bed combustor chamber to produce a cleansed exhaust stream having a low level of SO.sub.2 and injecting ammonia into the fluidized bed combustor to produce a cleansed exhaust stream having a low level of NO.sub.x.
An apparatus for combusting a fossil material so as to produce an exhaust stream having a low level of pollutants comprising a fluidized bed combustor having a chamber, means for introducing the fossil material into the fluidized bed combustor, means for maintaining the fluidized bed combustor chamber at stoichiometric conditions or above and at an operating temperature of at least approximately 1775.degree. F. so as to produce a partially cleansed exhaust stream having low levels of N.sub.2 O and CO and means apart from the fluidized bed combustor chamber for removing SO.sub.2 from the partially cleansed exhaust stream so as to produce a cleansed exhaust stream having a low level of SO.sub.2, the SO.sub.2 removal means apart from the fluidized bed combustor chamber permitting the fluidized bed combustor chamber to be maintained at temperatures without regard to efficient sorbent utilization therein.
Dependencies are inferred from the claim text.