Патент USA US2355021код для вставки
Aug. 1, 1944. J. wArrKus 2,355,021 WASHING APPARATUS FOR AIR PREHEATERS Filed Aug.’ 8, 1941 '14: 8 _. u. j; a. x 2 Z5A 30 10 Aime/41¢ 71615045 ' ii Mg. ATTORNEY‘ 2,355,021 Patented Aug. 1, 1944 UNITED STATES; PATENT OFFICE 7 ~ WASHING ~ ~ ~ PREHEATERS APPARATUS FOR Am : Joseph Waitkus,y_Wellsville, N. Y., assigno'r'to The ' Air Preheater Corporation, New York, N. Y.v Application August 8, 1941, Serial No. 405,939 ‘ 6 Claims. The present invention relates to heat transfer apparatus and particularly to improvements in apparatus for washing the heat transfer surfaces of rotary, regenerative, air’ preheaters, such as Ljungstrom preheaters; ' ~ ' 1 In the Liun‘gstrom ‘air preheater metallic heat transfer plates carried in compartments of a rotor absorb heat in passing through the gas side (01. 257-1) ‘ " fer elements 16 in the form of undulated metallic plates. The rotor is turned slowly clockwise, for example, aboutza vertical axis by a motor 20' geared by a speed'reducer 22 to the'rotor shaft _ 24 so that the heat transfer elements are turned slowly to vfirst absorb heat from hot gases pass. ing to the outlet duct 26 at the gas side of the air preheater and when rotor movement positions them in the air side of the preheater the heat of the preheater and subsequently. they are turned into position to yield their heat to air flowing 10; transfer elements yield their heat to air entering the preheater through the‘ air inlet duct 28'. In accordance with the present invention the preheater is provided preferably on the air side transfer plates from the gases ?owing thereover. with. a nozzle >30 rotatable in a circular path Soot blowers ‘are ordinarily provided for remov-' ing these deposits. However, experience has in 15.; above the rotor [2. As shown, the nozzle is at the end-of a right angled extension 32 of a pipe dicated that the deposits are heaviest‘ at points 34 mounted for rotation clockwise, for example, near the innermost portions and also in the outer about a vertical axis-substantially in the center parts of the compartments because the soot of the air duct. The diameter of the circle of blower does not clean these surfaces as effec rotation of the nozzle-is preferably nearly equal 20' tively'as it cleans ‘the plates which are in the to the radial depth of the sector compartments center portion of the various‘compartments of‘ in which the heat transfer'plates are mounted so the rotor. that all may be washed. The pipe 34 is guided ' The present invention contemplates apparatus forrrotation in a bearing 36 on a housing 38 for cleaning the heat transfer surfaces in the rotor compartments bycontinuously directing a '25 suitably attached/to'the air duct wall or'the framework of the preheater. Intermeshing bevel stream of water thereover. This is eifected by 7 gears 40, 42 on the-pipe-34 and a shaft 44 driven means of a nozzle rotating in av circular path throughsuitable reduction gearing by a motor 46 above the rotor in the same direction as the latter provide a means by which the pipe 34- maybe on the air side of the preheater. Near the center rotated and the nozzle 30 swung slowly in a cir 30 and also near the outer edge of the rotor the cular path. Water is- supplied to the nozzle pipe ' path of‘ the nozzle is tangential to the ‘path of through a supply line 48 which extends into the movement of the heat transfer elements in these housing 38 and is provided with a coupling 5!] parts of the rotor: compartments. Hence, largerv suitable for connecting it to the rotatable pipe 34. quantities of water ‘?ow over these‘elements be-' Preferably, the motor 46 operates whenever the. cause of the fact that the movement of the nozzle preheater is in- use and water is continuously relatively to the movement of the elements‘is supplied to the nozzle 30. As the latter is moved slowest at'the'se points. ' clockwise, for example, in a circular path above The invention will be best understood upon the heat transfer plates passing therebeneath, consideration of the following detailed descrip tion of an illustrative embodiment when read in‘ 40. the particles of soot, ash-and other deposits are removed from‘ the heat transfer elements by the conjunction with the accompanying drawing in stream of water ?owing thereover. Inasmuch as the clockwise movement of the nozzle is tangen of a Ljungstrom air‘ Figure 1 is a plan view tialto the path; ofclockwise movement of the preheater provided ‘with washing apparatus in accordance with the present invention, some 45 elements when the nozzle is near the outer ends of the compartments, the rate of relative move parts being shown in section; ment between the nozzle and plates is lowest due Figure 2 is a sectional view on the line 2—2 in through the air side of the preheater. Soot and ashes are deposited on the surfaces of the heat which ' Figure 1; and ' _ T ' , Figures 3 and 4 are sectional views of an al to their moving in the same direction and a rela tively greater amount of water flows over the heat 50 transfer elements in the outer parts of the com ternative detail of construction. partments than over elements located nearer to In the drawing the numeral l0 designates the the center of the rotor. The speed of the rotor casing of a Ljungstrom air preheater having a may also be slowed down, if desired, to decrease rotor l2 subdivided by radial partitions I4 to the rate of relative movement and thereby in form a number of sector-shaped compartments each of which contains a plurality of heat trans 55 crease the effectiveness of the washing. 2 2,355,021 Instead of employing a separate motor 46 to operate the nozzle 30 suitable connections may be made so that it may be driven from the rotor shaft 24. about a center substantially coincident with that of one of said ducts for swinging said nozzle in a circular path with respect to the rotor portion in said duct, said path having a diameter sub stantially equal to the radial depth of the rotor compartments; and means for slowly rotating It may be considered undesirable for some in stallations to wet the heat transfer plates l6 when they are positioned in locations where they said arm in the same direction as said rotor. will enter the hot gas side of the preheater before 4. In a regenerative air preheater having a ro there has been an opportunity for water to drain tor divided into compartments carrying heat properly from their surfaces. For example, the 10 transfer surfaces for absorbing heat from hot elements at the upper left hand portion of the ro- ~ tor in Fig. 1 might, if wetted, carry water into the gas side of the preheater. One means of meeting 1 ' this condition is diagrammatically illustrated in Figs. 3 and 4. In these ?gures the nozzle pipe 34a and the coupling member 50a are arranged ' like a plug valve. Part of the wall of the pipe 34a , is cut away near its upper end to receive water gases ?owing through a gas duct and imparting it to air ?owing through an air duct; a nozzle ‘supplied with a ?uid for cleaning said heat trans fer surfaces; means for supporting said nozzle for movement with respect to said rotor in a cir cular path centered approximately in the middle of one of said ducts, said path having a radius approximately one-half the radial depth of the rotor compartments; means for slowly rotating from the chamber in the coupling member 50a. When the port 501) leading from the chamber and 20 said nozzle and rotor in the same direction; and coupling member 50a is obscured by the uncut means controlled by the position of said nozzle portion of the wall of the pipe 34a the ?ow of for automatically discontinuing the supply of ?uid washing ?uid to the nozzle 30 is cut off. By prop erly proportioning and locating the port and the to said nozzle as it moves, through a predeter mined portion of its path. uncutportion of the wall of the pipe 34a the ?ow 25 5. In a regenerative air preheater having a of ?uid to the nozzles 30 may ‘be automatically cut horizontally disposed rotor divided into compart off over the desired arc in the circle of rotation'of ments carrying heat transfer surfaces for ab-' the nozzle pipe 30. ' sorbing heat from gases ?owing through its gas What I claim is: ’ duct and impart it to air ?owing through its air 1. In a regenerative 'air preheater having a ro tor divided into compartments carrying heat transfer surfaces for . absorbing heat from hot 30 duct; a rotatable arm of a length approximat ing half theyradial depth of the rotor compart ments; a nozzle carried at one end of said arm; gases ?owing through a gas duct and imparting it means for supplying a cleaning ?uid to said to air ?owing through an 'air duct; a nozzle sup nozzle; means for supporting said arm at‘ its plied with a ?uid for cleaning said heat transfer 35 other end for movement about a center substan surfaces; means for supporting said nozzle for tially coincident with that of the air ducts for movement with respect'to said rotor in a circu swinging said nozzle in a circular path above the lar path centered approximately in the middle part of the rotor passing through said duct, said path having a diameter substantially equal to the radial depth of the rotor compartments; and of one of said ducts, said path having a radius approximately one-half the radial depth of the rotor compartments; and means for slowly ro tating said nozzle and rotor in the same direction. 2.'In a regenerative air preheater having a means for slowly rotating said arm and rotor in horizontally disposed rotor divided into compart horizontally disposed rotor divided into ‘com; partments carrying heat transfer surfaces for ab sorbing heat from gases ?owing through its gas duct and impart it to air ?owing through its air ments carrying heat transfer plates for absorb ing heat from gases ?owing through a gas duct and impart it to air ?owing through an air duct; the same direction. , ' 6. In a regenerative air' preheater having a a nozzle supplied with ?uid for cleaning said duct; a rotatable arm of a length approximating plates; means for supporting said nozzle for half the radial depth of the rotor compartments; movement above said rotor in a circular path cent tered approximately in the middle of one of said ducts, said path having a radius approximately one-half the radial depth of the rotor compart ments; and means for slowly rotating said nozzle and rotor in the same direction‘ 3. In a regenerative air preheater having a horizontal rotor divided into compartments car rying heat transfer ‘plates for absorbing heat from a nozzle carried at one end of said arm; means for supplying a cleaning ?uid to said nozzle; means. for supporting saidarm at its other end for move ment about a center substantially coincident with that of the air ducts for swinging said nozzle in r a circular path above the part of the rotor pass ing through said duct, said path having a diame ter substantially equal to the radial depth of the rotor compartments; means for slowly rotating hot gases ?owing through a gas duct and im said arm and rotor in the same direction; and parting it to air ?owing through an air duct; a 60 means controlled by the position of said nozzle rotatable arm positioned on the air duct above for discontinuing the supply of water to said noz said rotor; a nozzle carried by said arm; means zle as it moves through a predetermined portion for supplying a cleaning liquid to ‘said nozzle; of its path. ' ' means for supporting said arm for movement JOSEPH WAITKUS.