Cleaning apparatus for heat exchange surfaces and an improved nozzle device therefor

A heat exchanger including a cleaning apparatus for cleaning heat transfer surfaces of the heat exchanger, said cleaning apparatus comprising outlet means incorporating nozzle means for discharging cleaning mediums onto said heat transfer surfaces, conduit means for delivering cleaning mediums to said outlet means and inlet means for supplying cleaning mediums to the conduit means, said nozzle comprising two sets of discharge nozzles each of which sets is associated with a respective cleaning medium a first one of said nozzle sets having nozzles for the discharge of relatively higher pressure medium, while the second nozzle set has nozzles of relatively larger throat diameter serving for the discharge of relatively lower pressure medium, said first and second nozzle sets being adapted for fluid communication with separate respective first and second conduit means whereby each nozzle set receives its respective cleaning medium, said first conduit means being adapted to deliver high pressure water substantially without leakage wherein said second nozzle set for the lower pressure medium is located downstream of said first nozzle set for the higher pressure medium, and in that nozzles of said second set are arranged coaxially with nozzles of said first set whereby cleaning medium discharge from the first nozzle set passes through the throats of the nozzles of the second nozzle set so enabling cleaning medium discharged selectively from both the nozzle sets to pass from the outlet means without substantial obstruction.

Cleaning apparatus for cleaning heat transfer surfaces in a heat exchanger and capable of handling several cleaning mediums of different characteristics, said cleaning apparatus comprising outlet means incorporating nozzle means for discharging cleaning mediums onto said heat transfer surfaces, conduit means for delivering cleaning mediums to said outlet means and inlet means for supplying cleaning mediums to the conduit means, said nozzle means comprising two sets of discharge means each of which sets is associated with a respective cleaning medium, a first one of said nozzle sets having nozzles for the discharge of relatively higher pressure medium, while the second nozzle set has nozzles serving for the discharge of relatively lower pressure medium, said first and second nozzle sets being adapted for fluid communication with separate respective first and second conduit means, whereby each nozzle set receives its respective cleaning medium, at least a portion of said first conduit means extending within said second conduit means, said second conduit means including a moveable lance portion and a static input feed portion, said first conduit means being moveable and extending into said lance portion, said static conduit portions being off-set relative to the centre-line of said lance portion and having a section within said lance portion beside which section the first conduit means extend.

Cleaning apparatus for cleaning heat transfer surfaces in a heat exchanger and capable of handling several cleaning mediums of different characteristics, said cleaning apparatus comprising outlet means incorporating nozzle means for discharging cleaning mediums onto said heat transfer surfaces, conduit means for delivering cleaning mediums to said outlet means and inlet means for supplying cleaning mediums to the conduit means, said nozzle means comprising two sets of discharge nozzles each of which sets is associated with a respective cleaning medium a first one of said nozzle sets having nozzles for the discharge of relatively higher pressure medium, while the second nozzle set has nozzles serving for the discharge of relatively lower pressure medium, said first and second nozzle sets being adapted for fluid communication with separate respective first and second conduit means, whereby each nozzle set receives its respective cleaning medium, said first conduit means including a rigid tube part connecting with the first nozzle set and a flexible tube part sealingly coupled at one end to the rigid tube part and passing around a pulley wheel with the other end of the flexible tube part secured at a static fixing point, an extendible member for the first nozzle set for movement of the first nozzle set between retracted and advanced positions, and a carriage for the pulley wheel adapted to move with said extendible member but at a reduced speed relative thereto.

A heat exchanger including cleaning apparatus for cleaning heat transfer surfaces of the heat exchanger said cleaning apparatus comprising cleaning apparatus for cleaning heat transfer surfaces in a heat exchanger and capable of handling several cleaning mediums of different characteristics, said cleaning apparatus comprising outlet means incorporating nozzle means for discharging cleaning mediums onto said heat transfer surfaces, conduit means for delivering cleaning mediums to said outlet means and inlet means for supplying cleaning mediums to the conduit means, said nozzle means comprising two sets of discharge nozzles each of which sets is associated with a respective cleaning medium, a first one of said nozzle sets having nozzles for the discharge of relatively higher pressure medium, while the second nozzle set has nozzles serving for the discharge of relatively lower pressure medium, said first and second nozzle sets being adapted for fluid communication with separate respective first and second conduit means, whereby each nozzle set receives its respective cleaning medium, at least a portion of said first conduit means extending within said second conduit means said second conduit means including a moveable lance portion and a static input feed portion, said first conduit means being moveable and extending into said lance portion, said static conduit portions being off-set relative to the centre-line of said lance portion and having a section within said lance portion beside which section the first conduit means extend.

A heat exchanger including cleaning apparatus for cleaning heat transfer surfaces of the heat exchanger, said cleaning apparatus comprising cleaning apparatus for cleaning heat transfer surfaces in a heat exchanger and capable of handling several cleaning mediums of different characteristic, said cleaning apparatus comprising outlet means incorporating nozzle means for discharging cleaning mediums onto said heat transfer surfaces, conduit means for delivering cleaning mediums to said outlet means and inlet means for supplying cleaning mediums to the conduit means said nozzle means comprising two sets of discharge nozzles each of which sets is associated with a respective cleaning medium, a first one of said nozzle sets having nozzles for discharge of relatively higher pressure medium, while the second nozzle set has nozzles serving for the discharge of relatively lower pressure medium medium said first and second nozzle sets being adapted for fluid communication with separate respective first and second conduit means, whereby each nozzle set receives its respective cleaning medium, said first conduit means including a rigid tube part connecting with the first nozzle set and a flexible tube part sealingly coupled at one end to the rigid tube part and passing around a pulley wheel with the other end of the flexible tube part secured at a static fixing point, an extendible member for the first nozzle set for movement of the first nozzle set between retracted and advanced positions and a carriage for the pulley wheel adapted to move with said extendible member but at reduced speed relative thereto.