Apparatus for treating dust-containing gas

Claim 1

Apparatus for treating dust-containing, high-temperature gas to separate the dust from the gas, said apparatus comprising: (a) a generally tower-shaped, vertically oriented container comprising an upper case containing a gas distribution chamber, a middle case, and a lower case which functions as a dust hopper; (b) an inlet for dust-containing gas in fluid communication with the gas distribution chamber in said upper case; (c) a discharging port for dust located at the bottom of said lower case; (d) a generally horizontal upper tube sheet disposed in said container in a gas-tight manner between said upper case and said middle case; (e) a generally horizontal lower tube sheet disposed in said container in a gas-tight manner between said middle case and said lower case; (f) at least one generally horizontal middle tube sheet disposed in said container between said upper and lower tube sheets; (g) a plurality of vertically disposed, horizontally spaced filtration tubes made of a solid porous material disposed in said container and extending from said upper tube sheet to said lower tube sheet through said at least one generally horizontal middle tube sheet, each of said filtration tubes having an open upper end received in a gas-tight manner in said upper tube sheet by a gas tight connection and in fluid communication with the gas distribution chamber in said upper case and an open lower end received in a gas-tight manner in said lower tube sheet by a gas tight connection and in fluid communication with the dust hopper in said lower case, each of said plurality of filtration tubes being formed of a plurality of unit filtration tubes which are coaxially disposed in a gas-tight manner by a gas tight connection; (h) at least one clean gas outlet in said middle case, said at least one clean gas outlet providing fluid communication between the exterior of said middle case and the interior of said middle case outside said filtration tubes; (i) a passage for coolant disposed in at least some of said tube sheets; (j) an inlet for coolant in fluid communication with each of said passages for coolant; and (k) an outlet for coolant in fluid communication with each of said passages for coolant.