1、附录一 This application is a continuation of PCT International Application Number PCT/IB2005/051909 filed Jun. 9, 2005, which claims the benefit of U.S. Provisional Patent Application Ser. No. 60/656,430, filed Feb. 24, 2005, both applications hereby incorporated by reference. TECHNICAL FIELD ： The pre
2、sent invention relates to a method and system for cleaning heat exchanger tube bundles and, more particularly, to a method and system for providing a safe, economical, and environmentally friendly cleaning of heat exchanger tube bundles using cleaning fluid produced on site and reprocessed on site,
3、such that long distance transport of cleaning solution is not required. BACKGROUND OF THE INVENTION ： A mobile cleaner for heat exchanger tube bundles is disclosed in commonly owned U.S. Pat. No. 5,437,296. While the prior art mobile cleaner provided an adequate cleaning of the heat exchanger tubes,
4、 it had several problems associated with its use. The first problem was that the prior art system vented some of the fumes from the cleaning solution directly into the atmosphere. Government agencies are now paying increased attention to the release of fumes into the atmosphere and have promulgated
5、various rules and regulations concerning proper handling of vapor emissions. Another problem involved the two top doors that did not completely seal against the top of the container or with each other, allowing escape of fumes and possibly cleaning fluid. The method of cleaning with the prior art mo
6、bile unit involved transporting the cleaning fluid to the site where the cleaning would take place, cleaning, and then transporting the used cleaning material for disposal or reprocessing. The prior art mobile cleaner also required extensive set up time to change roller positions to accommodate diff
7、erent sized tube bundles. These and other problems associated with the prior art identify a need for a new method and system for cleaning heat exchanger tube bundles. SUMMARY OF THE INVENTION ： The present invention overcomes at least one of the problems identified in the prior art by providing a me
8、thod of cleaning a heat exchanger bundle comprising the steps of: providing a mobile cleaning unit having a cleaning enclosure accessible by a top door and having a cleaning fluid reservoir； opening the top door of the cleaning enclosure to provide access thereto； loading at least one heat exchanger
9、 tube bundle into the cleaning enclosure； closing the top door of the mobile cleaning unit and pressurizing a seal positioned about top door to provide a fluid and vapor lock of the cleaning enclosure； purging oxygen from at least one of the enclosure, the cleaning fluid reservoir, and a control pan
10、els by filling at least one of the enclosure, the reservoir, and the control panels with nitrogen； and cleaning the heat exchanger tube bundle by spraying the cleaning fluid on the bundle. 0005 At least one embodiment of the present invention also provides a system for cleaning heat exchanger tube b
11、undles comprising: a mobile cleaning unit comprising a tube bundle receiving reservoir enclosure having a bottom, upstanding opposing sidewalls and end walls, and a door pivotally secured to one of said sidewalls； a means for moving the door to open and close the tube bundle receiving reservoir encl
12、osure； a cleaning fluid sump in communication with the tube bundle receiving reservoir enclosure； a plurality of drive roller assemblies and guide roller assemblies positioned in the tube bundle receiving reservoir enclosure to receive the heat exchanger tube bundles； an adjustable spray means posit
13、ioned in the tubular bundle receiving reservoir enclosure for spraying a cleaning fluid over the length of the heat exchanger tubular bundle； a pump and filter assembly for recirculating the cleaning fluid from the sump to the adjustable spray means； a cleaning fluid supply reservoir interconnected
14、with the sump； a means for heating the cleaning fluid in the supply reservoir prior to recirculating through the pump and filter assembly； a means for controlling the drive roller assembly, the pump and filter assembly, and the means for heating the cleaning fluid in the cleaning fluid supply reserv
15、oir, the controlling means comprising a plurality of explosion-proof control elements housed in a cabinet, and a vapor lock seal comprising an interior chamber, the seal positioned about the top of the reservoir enclosure and sealingly engaging the door when the interior chamber of the seal is press
16、urized with a source of gas. 0006 These and other advantages will be apparent upon review of the drawings and the detailed description of the invention. BRIEF DESCRIPTION OF THE DRAWINGS 0007 This invention will now be described in further detail with reference to the accompanying drawings, in which
17、: 0008 FIG. 1 is a perspective view of a portion of the heat exchanger tube bundle cleaning device illustrating a mobile reservoir with portions broken away； 0009 FIG. 2 is a top plan view of the heat exchanger tube bundle cleaning device with portions broken away； 0010 FIG. 3 is an end cross-sectio
18、nal view of the heat exchanger tube bundle cleaning device illustrating heat exchanger tube bundles shown in broken lines as positioned during use； 0011 FIG. 4 is a graphic perspective schematic illustration of the cleaning fluid flow path and associated pumping and filtering apparatus and spray noz
19、zles within the invention； 0012 FIG. 5 is a graphic illustration of the heat exchanger tube bundle cleaning device showing the relative relationship of the associated reservoirs and circulation pumps, etc. 0013 FIG. 6 is an end cross-sectional view of the heat exchanger tube bundle cleaning device s
20、hown in a configuration for cleaning large single tubular heat exchanger tube bundles； 0014 FIG. 7 is a cross-sectional view of the sealing system of the present invention； 0015 FIG. 8 is a diagram depicting the venting system of the present invention； and 0016 FIG. 9 is a diagram showing the method
21、 of the present invention. DETAILED DESCRIPTION OF THE INVENTION 0017 Referring to FIGS. 1-4 of the drawings, a mobile self-contained heat exchanger tube bundle cleaning device 10 can be seen having a mobile base 11 mounted on a trailer configuration 12 having a bed 13 and a trailer hitch portion 14
22、 with associated wheel assemblies 15 thereon. While shown as a trailer configuration, the unit 10 is also contemplated as an integral frame unit that is transported to a location on a flatbed or the like and dismounted at the facility where the cleaning is to take place. 0018 The mobile base 11 incl
23、udes a main tube bundle receiving reservoir enclosure 16 having spaced, oppositely disposed sidewalls 17 and 18 integral respective end walls 19 and 20 and an interconnected bottom structure 21. The main tube bundle receiving reservoir enclosure 16 has a domed top door 22 that is pivotally secured t
24、o the upper edges of sidewall 17. The door 22 pivots inwardly towards sidewall 18 forming an enclosed sealed cleaning area within the tube bundle receiving reservoir enclosure 16 at 24. 0019 A cleaning fluid supply reservoir 25 is positioned directly below a portion of said bottom structure 21 of th
25、e bundle receiving reservoir enclosure 16 defining an elongated rectangular tank, see FIGS. 4, 5 and 6 of the drawings. The cleaning fluid supply reservoir 25 is positioned centrally to the tube bundle receiving reservoir enclosure 16 thereabove and supplies all of the cleaning fluid required in the
26、 mobile self-contained configuration. The reservoir 16 is filled at the cleaning site with cleaning fluid and is emptied after cleaning is complete. A plurality of heating elements 25A are positioned in spaced, longitudinal relation within the cleaning fluid supply reservoir 25 for heating of a clea
27、ning fluid solution within to operational temperatures up to 200 degrees Fahrenheit. The elevated temperature significantly increases the effectiveness of the cleaning fluid. A typical formulation for the cleaning fluid would be Naptha or solvents including Naptha such as Suresol 100, or any other p
28、etroleum distillate that is a product or by-product at the facility having the heat exchangers. It is also contemplated that various chemical cleaning solutions could also be used as the cleaning fluid such as acids or caustic solutions. 0020 A recirculation and filter sump 27 is positioned directly
29、 adjacent the respective ends of said main tube bundle receiving reservoir enclosure 16 and the cleaning fluid supply reservoir 25. The recirculation and filtering sump 27 is in direct communication with the main reservoir 16 for receiving used cleaning fluid therefrom. The recirculation and filter
30、sump 27 has multiple particle filter screens 28 positioned within for initial fluid filtering of the used cleaning fluid within the recirculation system. 0021 A main pump and filter assembly 29 are on a secondary mobile base 11B which is positioned on the trailer bed 13 adjacent to and in communicat
31、ion with the recirculation and filter sump 27 to provide cleaning fluid under pressure to a spray nozzle assembly 30 within said main tubular bundle receiving reservoir enclosure 16. 0022 The spray nozzle assembly 30 includes pairs of nozzle support and supply manifolds 31 and 32 extending in spaced
32、 parallel relation to one another along said respective sidewalls 17 and 18 by adjustable manifold support brackets 17A and 18a, best seen in FIG. 3 of the drawings. 0023 Each of the supply manifolds have a plurality of fixed longitudinally spaced inwardly facing spray nozzles 33 therein forming an
33、overlapping two level spray pattern within the heat exchanger tube bundle receiving reservoir enclosure 16. The supply manifolds 31 and 32 can be rotated on their longitudinal axis within the adjustable manifold support bracket 17A and 18A so that the relative positioning of the nozzles 33 can be di
34、rected and repositioned in relation to the main tube bundle receiving reservoir enclosure 16. The pump and filter assembly 29 includes a pump 34 and a high volume filter 35 interconnected thereto by supply lines 36 and associated valving as will be well known to those skilled in the art. 0024 A seco
35、ndary pump assembly 37 is used to initially fill the heat exchanger tube bundle receiving reservoir enclosure 16 and the recirculation and filtering sump 27 from the cleaning fluid supply reservoir 25 as best seen in FIG. 5 of the drawings. 0025 Referring back to FIGS. 1-3 of the drawings, it will b
36、e seen that the bottom of the heat exchanger tube bundle receiving reservoir enclosure 16 is flat with at least one drive roller assembly 40 and a guide roller assembly 41 mounted thereon. The configuration shown comprises a set-up for two heat exchanger bundles. Drive roller assembly 40 includes variable speed hydraulic motors 40C mounted on end wall 19 turning a sprocket and chain assembly 40D for turning drive roller assembly 40. The variable speed hydraulic motors 40C allow continuous turning of the rollers or a jog feature that rotates a
