System and method for treating a flue gas stream
First Claim
1. A method for treating a flue gas steam, the method comprising the steps of:
- combusting a carbonaceous fuel in a combustion furnace to form a flue gas stream, wherein the flue gas stream comprises water vapor, particulate matter, and at least one strong acid compound;
injecting a sodium sorbent into the flue gas stream downstream of the combustion furnace;
calcining substantially all of the sodium sorbent in the presence of the flue gas stream to form a soda ash;
reducing the concentration of the at least one strong acid compound in the flue gas stream by reacting the at least one strong acid compound with the soda ash to form a sodium based by-product; and
changing the chemistry of the flue gas stream to reduce the overall average particulate matter resistivity.
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Accused Products
Abstract
The present invention is a system and method for treating a flue gas stream to remove strong acid compounds selected from the group consisting of hydrofluoric acid (HF), hydrochloric acid (HCl), sulfuric acid (H2SO4), and sulfur trioxide (SO3) by injecting a sodium sorbent selected from the group consisting of sodium sesquicarbonate, sodium carbonate-bicarbonate, trona ore, mechanically refined trona ore, and trona into the flue gas stream, calcining substantially all of the sodium sorbent in the presence of the flue gas stream to form a soda ash, reducing the concentration of the at least one strong acid compound in the flue gas stream by reacting the at least one strong acid compound with the soda ash to form a sodium based by-product; and changing the chemistry of the flue gas stream to reduce the overall average resistivity of the particulate matter.
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Citations
30 Claims
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1. A method for treating a flue gas steam, the method comprising the steps of:
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combusting a carbonaceous fuel in a combustion furnace to form a flue gas stream, wherein the flue gas stream comprises water vapor, particulate matter, and at least one strong acid compound;
injecting a sodium sorbent into the flue gas stream downstream of the combustion furnace;
calcining substantially all of the sodium sorbent in the presence of the flue gas stream to form a soda ash;
reducing the concentration of the at least one strong acid compound in the flue gas stream by reacting the at least one strong acid compound with the soda ash to form a sodium based by-product; and
changing the chemistry of the flue gas stream to reduce the overall average particulate matter resistivity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method for treating a flue gas steam, the method comprising the steps of:
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combusting a carbonaceous fuel in a combustion furnace to form a flue gas stream, wherein the temperature of the flue gas stream is at least 250 degree Fahrenheit but less than 368 degrees Fahrenheit and wherein the flue gas stream comprises water vapor, particulate matter, and at least one strong acid compound selected from the group consisting of HF, HCl, H2SO4, SO3;
injecting a sodium sorbent into the flue gas stream downstream of the combustion furnace and upstream of a particulate collector wherein the sodium sorbent is selected from the group consisting of sodium sesquicarbonate, sodium carbonate-bicarbonate, trona ore, mechanically refined trona ore, and trona and wherein the sodium sorbent is an essentially moisture free finely divided powder having an average particle size equal to or less than 28 microns;
calcining substantially all of the sodium sorbent in the presence of the flue gas stream to form a soda ash;
reducing the concentration of the at least one strong acid compound in the flue gas stream by reacting the at least one strong acid compound with the soda ash to form a sodium based by-product;
increasing the surface resistivity of the particulate matter downstream of the sodium sorbent injection;
decreasing the volumetric resistivity of the particulate matter downstream of the sodium sorbent injection; and
removing substantially all of the particulate matter and the sodium based by-product from the flue gas stream in a particulate collector, wherein the particulate collector is selected from the group consisting of mechanical particulate collectors, electrostatic particulate collectors, and hybrid particulate collectors.
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30. A system for removing strong acid compounds from a flue gas stream of a steam generator cycle, the system comprising:
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a combustion furnace wherein a carbonaceous fuel is combusted in the presence of oxygen to form a flue gas stream, the flue gas stream comprising particulate matter, water vapor, and at least one strong acid compound wherein the at least one strong acid compound is selected from the group consisting of SO3, HCl, and HF;
at least one flue gas duct in mechanical communication with the combustion furnace through which the flue gas stream traverses, the flue gas duct having an inner and an outer surface wherein the flue gas stream is in fluid contact with the inner surface of the flue gas duct;
at least one sodium sorbent injection probe having at least one terminal end, wherein the at least one terminal end passes through the outer and the inner surface of the at least one flue gas duct so as to be in fluid contact with the flue gas stream;
at least one sodium sorbent delivery system in mechanical communication with the at least one sodium sorbent injection probe;
at least one source of sodium sorbent assessable to the at least one sodium sorbent delivery system wherein the sodium sorbent is selected from the group consisting of sodium sesquicarbonate, sodium carbonate-bicarbonate, trona ore, mechanically refined trona ore, and trona; and
at least one particulate collection system through which essentially all the flue gas stream passes, the particulate collection system being in mechanical communication with the at least one flue gas duct and positioned downstream of the at least one sorbent injection probe.
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Specification