Fluid sprinkling – spraying – and diffusing – Distributor continuously moves relative to support during... – Transmission details
Patent
1995-06-23
1997-09-16
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Distributor continuously moves relative to support during...
Transmission details
239290, 239424, 239566, 153161, 15317, 122390, 122392, B05B 300
Patent
active
056671393
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to cleaning apparatus for use in cleaning heat exchange surfaces, especially but not exclusively in regenerative heat exchangers, and more particularly concerns a novel nozzle device for jets of cleaning medium in such apparatus.
Heat exchanger cleaning apparatus is known which functions to provide jets of cleaning medium which impinge on heat exchange surfaces of the heat exchanger to remove coatings or barrier layers which have built up on the surfaces, these barrier layers being formed by the presence of contaminants in heating gas, for example combustion gas from a furnace, passing over the heat exchange surfaces. These barrier layers are generally of a non-conductive form and hence seriously detract from heat exchange performance. The heat exchange surfaces can be formed by tubes or places, and the surfaces may be static, or may move for example for rotary regenerative heat exchange.
In many applications cleaning apparatus of several types generically known as "sootblowers" are fitted as ancillary equipment and used periodically to remove the barrier layer so as to restore heat transfer efficiency and gas flow pressure differential as closely as possible to the clean surface performance design datum. A jet (or jets) of cleaning medium fluid is projected at such mass flow rate and velocity as will ensure sufficient residual energy at point of impact to dislodge contaminant particles adhering to the heat transfer surface, whereupon the particles will migrate from the surface by gravity or by re-entrainment in the gas flow. The cleaning medium is generally pressurized dry saturated or superheated steam, compressed air or some other gaseous fluid, and in some installations temporary provision can be made for passing mains pressure water through the same nozzle or nozzles (or ancillary dedicated nozzle or nozzles) for washing the heat transfer surfaces when off-load.
The heat exchange surfaces can be static, and a sootblower can be designed to move its nozzle or nozzles continuously during operation relative to the static surfaces in such a way as to maximize the proportion of surface area exposed to impact from the cleaning jet or jets. A conventional sootblower therefore may incorporate the means of admitting one or two alternative cleaning media to one or more commonly shared nozzles, and to move the nozzle or nozzles in a predetermined pattern relative to static heat transfer surfaces such as to optimize cleaning effectiveness.
The alternative concept of rotary regenerative heat exchange between two gaseous fluids at different temperatures employs heat exchangers in which moving solid components e.g. corrugated plate packs are heated during passage through ducting containing the hotter of the two fluids, pass through a seal separating the two fluids, and then discharge their acquired heat during passage through the ducting containing the colder of the two fluids. Typical applications are the preheating of combustion air by utilizing residual heat in boiler exhaust gases, or the re-heating of cool gases by transferring heat from gas at a higher temperature from some other part of the gas handling process. The corrugated plates are arranged in a plane parallel to the axis of a hub about which they are arranged circumferentially, and relative to each other in a laminer manner, with the fluid passing axially through each inter-plate cavity width determined by the design of the corrugations. The hub rotates slowly, and in so doing moves the plate assemblies alternately between the hot and cold fluid ducts. As with static flat plate heat exchangers, the inter-plate cavities may become partially blocked, reducing their ability to absorb and discharge heat, and increasing both the gas pressure drop in the direction of gas flow and the risk of fire.
In these types of heat exchangers the heat bearing plates move relative to the static sootblower locations, and the nozzle or nozzles remain stationery for one or more rotations of the hub, discharging jets of cleaning medium along a ci
REFERENCES:
patent: 2897532 (1959-08-01), Cantieri
patent: 4498213 (1985-02-01), Zalewski
patent: 4583496 (1986-04-01), Albers et al.
patent: 5002120 (1991-03-01), Boisture et al.
patent: 5230306 (1993-07-01), Barringer et al.
Clyde Forest Limited
Ganey Steven J.
Kashnikow Andres
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