EP0256529A1
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EP
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Method of preventing deactivation of denitrating catalyst
Assignee: TOA NEKKEN CORP Ltd
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Filing: 1987-08-13
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Granted: —
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Expires: 2007-08-13
Abstract
Abstract The deactivation of a denitrating catalyst that is caused by exhaust gas dust in a boiler, a furnace or the like which employs a fossil fuel, particularly pulverized coal, can be controlled with excellent results by adding to a fuel at a mill installed in a coal fuel line or at a point upstream of the mill at least one iron compound in a small amount in the form of an aqueous solution, or a powder or water slurry containing coal particles, or in case of employing pulverized coal or heavy oil as a fuel by adding a mixture of an iron compound, a vanadium compound and a tungsten compound, said mixture being in the form of powder, a water slurry or an oil slurry of powder, or an aqueous solution.
Inventors
- 👤 Iwao Morimoto
- 👤 Hiroshi Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 23:22
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/90; B01J23/94; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8628; B01J23/70; B01J23/74; B01J23/745; B01J38/00; B01J38/48
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
111 words
A method of controlling the deactivation of a denitrating catalyst comprising controlling the deactivation of a denitrating catalyst that is caused by an exhaust gas dust in a boiler, a furnace or the like which employs pulverized coal as fuel by adding to a fuel at a mill installed in a coal fuel line or at a point upstream of the mill at least one iron compound in an amount of 5 to 2000 ppm (in terms of Fe₂O₃) on the basis of the amount of pulverized coal in the form of an aqueous solution, or a powder or water slurry containing coal particles capable of passing through a 100-mesh screen.
Claim 2
Independent Claim
111 words
A method of controlling the deactivation of a denitrating catalyst comprising controlling the deactivation of a denitrating catalyst that is caused by an exhaust gas dust in a boiler, a furnace or the like which employs pulverized coal as fuel by adding to a fuel at a mill installed in a coal fuel line or at a point upstream of the mill at least one iron compound in an amount of 5 to 2000 ppm (in terms of Fe₂O₃) on the basis of the amount of pulverized coal in the form of an aqueous solution, or a powder or water slurry containing coal particles capable of passing through a 100-mesh screen.
Claim 3
Dependent Claim
12 words
The method according to Claim 1 wherein said iron compounds are water-soluble.
Claim 4
Independent Claim
149 words
A method of controlling the deactivation of a denitrating catalyst comprising controlling the deactivation of a denitrating catalyst that is caused by an exhaust gas dust in a boiler, a furnace or the like which employs pulverized coal or heavy oil as fuel by adding to a fuel a mixture of at least one iron compound in an amount of 5 to 200 ppm (in terms of Fe₂O₃) and at least one compound selected from the group consisting of vanadium compounds in an amount of 2 to 50 ppm (in terms of V₂O₅) and tungsten compounds in an amount of 1 to 15 ppm (in terms of WO₃), said mixture being in the form of powder having an average particle diameter of 5 microns or less, a water slurry or an oil slurry of powder having an average particle diameter of 3 microns or less, or an aqueous solution.
Claim 5
Independent Claim
149 words
A method of controlling the deactivation of a denitrating catalyst comprising controlling the deactivation of a denitrating catalyst that is caused by an exhaust gas dust in a boiler, a furnace or the like which employs pulverized coal or heavy oil as fuel by adding to a fuel a mixture of at least one iron compound in an amount of 5 to 200 ppm (in terms of Fe₂O₃) and at least one compound selected from the group consisting of vanadium compounds in an amount of 2 to 50 ppm (in terms of V₂O₅) and tungsten compounds in an amount of 1 to 15 ppm (in terms of WO₃), said mixture being in the form of powder having an average particle diameter of 5 microns or less, a water slurry or an oil slurry of powder having an average particle diameter of 3 microns or less, or an aqueous solution.
Claim 6
Dependent Claim
85 words
The method according to Claim 3 wherein the mixture of at least one iron compound and at least one compound selected from the group consisting of vanadium compounds and tungsten compounds is added in a boiler, a furnace or the like which employs pulverized coal as fuel by adding it to a mill installed in a coal fuel line or at a point upstream of the mill, said mixture being in the form of powder, a water slurry, an oil slurry, or an aqueous solution.
References Cited (Backward Citations)
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