Patent ID: 9739474
Date: 2017-08-22
CPC Classifications: B01F,F22B,F28D,F28F

Claim:
1. Waste heat boiler for heat exchanging a relatively hot process gas with a cooling media comprising: a shell, at least two tube sheets located within the shell, a plurality of heat exchange tubes comprising a plurality of inlet and outlet ends that extend through said tube sheets; a heat exchange section enclosed by a part of said shell and said at least two tube sheets; a process gas inlet section in fluid connection with said inlet ends; a process gas outlet section in fluid connection with outlet ends; at least one by-pass tube extending though the shell comprising an open exit end which is in fluid connection with said gas outlet section; at least one cooling media inlet in fluid connection with a shell side of said heat exchange section; at least one cooling media outlet for removing media from said shell side of said heat exchange section, and a mixer section, said mixer section including a first duct and a second duct extending through and beyond the first duct, said first duct having an inlet end in fluid connection with said outlet ends of said plurality of heat exchange tubes and an annular outlet end with internally arranged swirl inducing elements, said second duct in fluid connection with said open exit end of said by-pass tube and having an outlet end formed with radially arranged nozzles to tangentially eject by-passed process gases into the path of process gas emanating from the swirl elements, the mixer section including a first valve to control the flow of process gas exiting the heat exchange tubes, wherein the first valve is located at the entrance of the first duct and slides around the second duct.