Abstract Improved lead-in device passing a conductor through the cover of an electrical precipitation apparatus down to its spray system. The improved device is characterized in that a porous insulator is used as the insulator and a gas-tight insulating cylinder concentrically surrounds the porous insulator. The device is further fitted with a tubular gas inlet opening into the porous insulating cylinder. The upper and lower ends of the insulator and the insulating cylinder, respectively, are connected together by annular metal plates so as to form a space therebetween, and the space is occupied by a sealing gas maintained at a relatively higher pressure than that prevailing inside the electrical precipitation apparatus.
A lead-in device passing a conductor through the cover of an electrical precipitation apparatus down to its spray system, characterized in that the conductor passes centrally through a porous insulator; the said insulator being concentrically surrounded by a gas-tight insulating cylinder; the said insulating cylinder being provided with a tubular gas inlet opening thereinto; the upper and lower ends of the said insulator and the said insulating cylinder, respectively, being connected together by annular metal plates so as to form a space therebetween, and said space being occupied by a sealing gas maintained at a relatively higher pressure than that prevailing inside the electrical precipitation apparatus.
Claim 2
Dependent Claim
106 words
A lead-in device passing a conductor through the cover of an electrical precipitation apparatus down to its spray system, characterized in that the conductor passes centrally through a porous insulator; the said insulator being concentrically surrounded by a gas-tight insulating cylinder; the said insulating cylinder being provided with a tubular gas inlet opening thereinto; the upper and lower ends of the said insulator and the said insulating cylinder, respectively, being connected together by annular metal plates so as to form a space therebetween, and said space being occupied by a sealing gas maintained at a relatively higher pressure than that prevailing inside the electrical precipitation apparatus.
Claim 3
Dependent Claim
17 words
The device as claimed in claim 1, wherein the said insulator is made up of porous polytetrafluoroethylene.
Claim 4
Dependent Claim
21 words
The device as claimed in claim 2, wherein the porous polytetrafluoroethylene has pores with a diameter between 40 and 60 microns.
Claim 5
Dependent Claim
19 words
The device as claimed in claim 3, wherein the porous polytetrafluoroethylene has pores with a diameter of 50 microns.