Electrostatic precipitator electrode

Claim 1

A method of operating an electrostatic precipitator for the removal of pyrophoric dust from a gas, comprising the steps of: (a) forming corona-discharge electrode assemblies by tensioning corona-discharge electrode strips each composed of a sheet steel core clad on opposite sides with a corrosion-resistant steel and cut from sheet metal having an overall thickness of 1.5 to 2 mm and a cladding thickness of 8 to 12% of the overall thickness, in a frame, said corrosion-resistant steel cladding being resistant to spalling induced by pyrophoric reaction of deposits on said electrodes and selected from the group which consists of: (a 1 ) titanium or niobium stabilized steel with 10 to 18% by weight chromium, up to 0.1% by weight carbon, up to 1.0% by weight silicon, up to 1% by weight manganese, the balance being iron and unavoidable impurities which do not affect the properties of the composition, (a 2 ) titanium or niobium stabilized steel with 16 to 20% by weight chromium, 7 to 12% by weight nickel, up to 0.1% by weight carbon, up to 1% by weight silicon, up to 2% by weight manganese, the balance being iron and unavoidable impurities, and (a 3 ) a steel with 26 to 28% by weight chromium, 4 to 5% by weight nickel, 1.3 to 2% by weight molybdenum, up to 0.1% by weight carbon, up to 2% by weight manganese, the balance being iron and unavoidable impurities; (b) juxtaposing said assemblies with collector electrodes; and (c) electrostatically precipitating pyrophoric dust by electrostatically energizing said electrodes and passing said dust between said collector electrodes and said corona-discharge electrodes at a temperature of substantially 150° C. to 250° C.

Claim 2

A method of operating an electrostatic precipitator for the removal of pyrophoric dust from a gas, comprising the steps of: (a) forming corona-discharge electrode assemblies by tensioning corona-discharge electrode strips each composed of a sheet steel core clad on opposite sides with a corrosion-resistant steel and cut from sheet metal having an overall thickness of 1.5 to 2 mm and a cladding thickness of 8 to 12% of the overall thickness, in a frame, said corrosion-resistant steel cladding being resistant to spalling induced by pyrophoric reaction of deposits on said electrodes and selected from the group which consists of: (a 1 ) titanium or niobium stabilized steel with 10 to 18% by weight chromium, up to 0.1% by weight carbon, up to 1.0% by weight silicon, up to 1% by weight manganese, the balance being iron and unavoidable impurities which do not affect the properties of the composition, (a 2 ) titanium or niobium stabilized steel with 16 to 20% by weight chromium, 7 to 12% by weight nickel, up to 0.1% by weight carbon, up to 1% by weight silicon, up to 2% by weight manganese, the balance being iron and unavoidable impurities, and (a 3 ) a steel with 26 to 28% by weight chromium, 4 to 5% by weight nickel, 1.3 to 2% by weight molybdenum, up to 0.1% by weight carbon, up to 2% by weight manganese, the balance being iron and unavoidable impurities; (b) juxtaposing said assemblies with collector electrodes; and (c) electrostatically precipitating pyrophoric dust by electrostatically energizing said electrodes and passing said dust between said collector electrodes and said corona-discharge electrodes at a temperature of substantially 150° C. to 250° C.