Патент USA US2404516код для вставки
July 23, 1946. ' ' F. w. MILLER ' ‘2304516 METHOD OF CLEANING STEAM BOILERS Original Filed‘July 3, 1941 I 2 Sheets-Sheet 1 670/? RLEF/l. ron'PHrm‘ INVENTOR. if "A": ; July 23, 1946. F. w. MILLER ‘ 23045-15 METQ'IQD OF CLEANING ST‘EAM BOILERS . opgginar Filéd July 5, 1941 2_Sheets--Sheet 2 2,404,516 Patented July 23,1946 ’ , ' UNITED STATE 5 PATENT‘ OFFICE 2,404,516 METHOD OF CLEANING STEAM BOILERS 7 Frank W. Miller, Chicago, Ill., assignor to Fran clare Company, Chicago, Ill., a corporation of Illinois Original application July 3, 1941, Serial No. 400,932. Divided and this application Febru ary 3, 1943, Serial No. 474,540 3 Claims. (01. 122-382) 1 1 2 . , - . in Fig. 2, a suitable bracket or other support 6 carries the blow-off line ‘I, the re?ll water line This invention relates to the treatment of steam boilers for the purpose of relieving them of the scale and sludge which accumulates therein dur 8, the live steam line 9 comiected to be supplied with steam from the powerhouse boilers, and,in many instances, a washout water line, which in the present instance is not shown. ing their operation. The method most commonly employed in cleaning boilers is to blow off the steam and water, drain out any remaining water, and then wash the boiler by delivering jets of wash-out water at various angles and at various locations into For the purpose of superheating the re?ll Wa ter to be delivered to a boiler being treated, a water superheater or heat booster of the char, the boiler, in an endeavor to loosen and knock 10 acter illustrated in Fig. 3 is preferably employed. Such a booster comprises "a cylindrical casing ll oil.’ the accumulated scale and force the sludge provided intermediate its ends with a Venturi and other solid material toward the drain open tube [2 disposed in alignment with a water dee ing through which it is discharged. livery nozzle I3 having a ?ange l4 clamped to the The opening up of therboiler to atmosphere after the steam and water have been discharged 15 upper end of the casing H by supportingbolts I5 and IS. The inlet end of the nozzle is con results in a rapid drying and caking of the ob nected .by a pipe H with the re?ll water line 8, jectionable solid matter which it is desirable to re and in the pipe vl‘l is interposed a check valve move'from the boiler. This drying and caking is 18 and a shut-off valve l9. The superheater may increased by the heat existent in the, crown sheet and tubes, with the result that the encrusted solid 20 be mounted at any desirable height above the floor, but when mounted sufficiently high to be matter adheres with such. tenaciousness to the out of the way of workmen around the pits, as boiler surfaces that its removal by the jets of washing water is rendered impossible. One of the purposes of my present invention is to preclude this drying and caking of the solid matter upon the boiler surfaces and to remove the matter from the surfaces while in a soft and uncaked condition. With this end in view, my in vention contemplates the internal washing of the boiler with jets of high pressure water while some water and substantial steam pressure remain in the boiler, so that the atmosphere is excluded from the boiler and all the surfaces remain in a wet condition, which is most conducive to the removal of the sludge and solid matter therefrom. To facilitate an understanding of my inven tion, I have illustrated on the accompanying illustrated in Fig. 2, the valve I9 is equipped with a an operating lever 2| adapted to be operated 26 through the intermediary or pull chains 22 and,23. A pipe 24 is connected at one end with the casing ll above the Venturi tube l2, so as to com municate with the valve 25‘su1‘rounding the noz zle l3 and receives its steam supply from the 80 steam line 9. The pipe 24 is preferably equipped with a shut-off valve 26 and with a regulating ‘valve 21 by which the amount of steam delivered to the superheater may be regulated. This valve also, when located at an inaccessible height, is 35 equipped with operating pull chains 28. A branch 29 leading from the casing H below the Venturi is connected by a pipe 3| with the blow-o? line 1, and this pipe is also equipped with drawings as an exempli?cation one form of appa a check valve .32 and a shut-off valve 33 adapted ratus by which my improved method may be 40 to be operated by lever 34 to which are connected carried out. operating pull chains 35 and 36,. Referring to the drawings, I‘ i A ?exible conduit in the form of a hose or a Fig. 1 is a schematic view of an apparatus by pipe 31 provided with ?exible joints 38 is equipped which my invention may be practiced; at its free end with a coupling wrench 39 by Fig. 2 is a view showing the arrangement em 45 which the conduit may be connected with the ployed at one of the drops; blow-off cook or the washout plugs of 'a locomo-v Fig. 3 is a longitudinal sectional view through tive boiler. . the water superheater shown in Fig. 2; and Referring to the schematic layout of Figure 1, Fig. 4 is a fragmentary detail of one of the it will be apparent thatthe steam line 9, the adjustable nozzles. Referring to the drawings more in detail, ref 60 blow-off line 1 and the re?ll line 8 may be con erence character 5 indicates generally a locomo tive stationed at a pit in a roundhouse between - nected with the locomotive boiler through the common conduit 31 at will. The various connec tions are established as desired through manipu two adjacent drops. The apparatus at each drop lation of the valves 33, I3 and 21. From this in the roundhouse is preferably ‘of the character disclosed in my Patent No. 2,260,857.v As shown 5.5 ‘?gure it will be apparent that the blowv-o? line ' 2,404,516 ’ " IT Ti 1;:"11' 4 is adapted to deliver into a steam separator 4|v ously stated, is then further heated by steam from by which the blow-off steam and water are sepa rated. This separator is preferably of the cen trifugal type from which the blow-01f water is the line ‘I delivered through valve 21 until the ' temperature of the high pressure water, When delivered to the boiler is only slightly below the discharged through a pipe line 42 either to a waste. 5 temperature of the boiler under the pressure ex conduit or preferably to a storage tank where the istent therein. Because of this slightly lower water is stored for boiler washout and other use ful purposes. temperature, the delivered ‘water doesnot ?ash The sludge accumulated in the. .. into steam but is delivered as a solid high pres-' separator may be discharged to waste at suitable‘ ‘ ‘ sure jet against various interior surfaces of the intervals through a discharge pipe 43 controlled 10 boiler so as to remove the sludge, scale and other by a valve 44. The steam from the separator is , conducted through a line 45 to a condenser 46,, preferably of the open type through which water‘ is circulated to condense the steam. solid matter which has accumulated on these Since the boiler still contains water and steam and has not been opened to atmos phere as has heretofore been customary, no op - ' surfaces. This con densing water is taken from the re?ll storage tank‘ 15 4'! and delivered by a pump 48 through the line 49 to the condenser, from which it is returned through the line 5| into the re?ll storage tank. Additional water is supplied to the tank as re-' quired through a fresh water supply pipe 52. The 20 details, not shown, of the condensing system may be of the general type disclosed in my prior Patent portunity has been afforded for the accumulated solid matter to become caked upon the boiler sur faces, consequently, it is in a somewhat soft and non-adherent condition which is conducive to its. removal from the boiler surfaces. The main tenance of the boiler in hot condition and the delivery of hot washing water also contribute toward the freeing of the solid matter from the No. 2,135,407, issued November ,1, 1938. Re?ll boiler surfaces, so that greatly superior results water is delivered tolthe re?ll line 8 from the are attained than are possible with the usual prac storage tank‘ 4'! by means of a pump 53 in the 25 tice where the boiler is permitted to cool down and is washed with relatively cool water. In practicing my improved method of treating After the washing of the interior of the boiler boilers, the system above described is utilized in with high pressure high temperature water has’ ' usual manner. ' ' V ' the following manner: . . been partially completed, the blowing off opera IA locomotive to be treated ‘is positioned on a 30 tion is again, resumed by opening the left-hand, pit between two drops and thelefthand drop, for valve 33' (viewing Fig. 1) so that the solid matter which has been washed off of the boiler surfaces through the conduit 37 which is attached to the will be blown out of the boiler along with the blow-off cock of the locomotive._ Valves I9 and blow-off water and deposited in the separator 4 I, 2‘! are closed and valve 33 is vopened, thereby per 35 from which it may be discharged as previously mitting the boiler contents to be blown off through explained. The washing of the boiler with'hot the blow-off line 1, the steam and water being high pressure Water may be continued during the separated by the separator 4!, the blow-oil" water ?nal, blowing oif operation, with the result that being thrown away or conserved, as preferred,-v when the boiler has been completely emptied it is instance, viewing Fig. l 1 is connected thereto 1 1 ‘ ‘ 1 and the steam being condensed and stored in the ‘ re?ll‘ storage tank. ' ' ‘ 40 ' Instead of blowing off all of the water and , steam from the boiler, then opening ‘up the boiler ‘ and ‘washing it out as hasheretofore been cus- ,. ' 'tomary, my invention contemplates interrupting ' the blowing off operation when about two-thirds " of‘the ‘water has been blown off and about 100 pounds steam pressure remains in the boiler. ‘ Thisinterruption is effected vby closing the valve . substantially free from the accumulated solid matter, and, unless repairwork is required, it may be immediately re?lled without being opened up to atmosphere'or unduly cooled down. Even when washed in'accordance with my method, without being opened. to' atmosphere, the tem perature of the boiler is materiallyreduced below the normal working temperature, so that’ some contraction of the ‘boiler hasv occurred, ,The amount of contraction, however, is relatively 1 33. ‘Thereupon'the conduit 37; is connected with 50 small as. compared with that encountered in the }_ the boiler for washing purposes. The ‘connection ' ordinary practice of washing boilers, and, since 1 is'made successively to the various washout plugs, the boiler has remained under steam pressure somegof which are customarily equipped with nozzles disposed inside ‘the boiler and adapted to , during, practically the entire washing operation, ‘ 2, cleaning jet of waterzin various directions with such contraction as does occur ‘is, uniform» and does not impose injurious strains and stresses up 1 in the, boiler. onItthevarious believed boiler that parts. procedure.' in; accordance ' _, / 1 be turned tovarious positions so as to discharge A typical nozzle for this purpose ‘ is indicated by reference character 53 in Fig. 4. ‘ This nozzle is rotatably 'mountedln the plug 514 with my methodwill be understood from the force‘ going, and that the advantages resulting ;from 60 the practice of this method ‘will be appreciated, all without further description. Variations in‘ the rection, of discharge therefrom’is effected by method hereinabove described as illustrativea-nd means of theihandle 5t. When the connection toa washout plug, has been established, at the .7 wide modi?cation in the apparatus employedjin righthand .side of?the boiler, for instance, valve 65 practicing the method may obviouslybe resorted to Within the scope of the invention as :de?ne‘d'in 33 is left closed, valve 19 is opened, and valve 2'! ‘ and connected by a swiveljoint 55-wi'th the con ‘ duit 31. Rotation of the nozzle to vary the di ; ‘ 1 ‘ ‘ is also opened or partially opened so ‘as to heat ‘ the delivered water to 250° or more. ' The water 1 in the re?ll line, 8 .isd'elivered by a suitable pump at 150 to 200 pounds'pressure, which is materially ‘ higher than the pressure existent in the boiler. 1 This water has beenvpreviously heated by waste 1 products from the boiler washing system and ex ,haust steam from’. the power "boilers to a tem- . the following claims. 1, " / '~ , ' . ‘ , t 7;. _ This application is a division of my co-pending application Serial No, 400,932,.?led July 3,3,;1941 and which 7 has matured?intol 'PatentQNumber 2,318,247, May 4, 1943; ‘ ' ' » r r - ' v Iclaim; ‘1.1 The method of cleaning boilerswhichecon sists in partially 'Vblowing down a ‘boiler leaving therein about OHS-thll‘diOfltS :normal liquidcoll perature approaching‘200", and, as has been previ 75 tents under a substantial steam pressure, loosen 2,404,516 6 ing and removing accumulated solid matter from the boiler without permitting contact of the at mosphere therewith by delivering into said boiler boiler pressure and at a. temperature only slightly below the temperature existent in the boiler, and thereafter blowing off the remaining water to against the accumulated matter water at a pres gether with the solid matter loosened by the ac- ' sure above and at a temperature below the pres tion of said jet. sure and temperature of the boiler, and blowing o? the thus loosened solid matter together with the Water remaining in the boiler. 2. The method of cleaning steam boilers while under steam pressure which consists in partially blowing off the steam and water in the boiler until approximately one-third of thevnormal amount of liquid remains therein under substantial steam pressure, delivering into said boiler against the solid matter to be removed therefrom a jet of water under pressure greater‘than the existent ‘ 3. The method of cleaning boilers which con sists in blowing oif about two-thirds of the liquid contents of the boiler, delivering into said boiler containing a substantial water level under sub stantia1 steam pressure, jets of water at a slightly lower temperature than the boiler temperature, directing said jets toward the surfaces to be cleaned, and blowing off the thus ‘dislodged solid matter together with the remaining ?uid contents of the boiler. FRANK W. MILLER.