US1843790A - Boiler cleaner - Google Patents

Description

eb; 2, 19.32. N. I... snow ET AL BOILER CLEANER Filed Nov. 21. 1927 upeutoz Jnow Patented Feb. 1932 NORMAN L. SNOWLOENLEW-CANAAN; conivscrrcureaitn Satirist Econ; or ion-Thorn MICHIGAN, ASSIGNORS To nrnivronnrcwnn E'BECIAL'IY ccr ronrlrron; ornnriaor'gp; MICHIGAN, conronnrron or MIGHIGAN a u I c BOiLEB CL AN R Application filed-November 221 ,1927. Serial No.;2s4,7s4;

This invention relates to boiler cleaners and has particular reference toan improved blower element for structures ofthis character.

An object of this invention is to providea blower element which will successfully meet in a practical manner, the very exactinggr quirements of articlesaofrthis character.

More particularly an object of this inventionis to provide a blower elementhaving portions of different materials, the said materials havingsuch characteristics that the various portionsofthe blower element will be particularly adaptedto stand up underj the deteriorating action to which the respective portions are subjected V other Objects land Vantages ofiiis vention will become apparent as thefollowing' description 1 proceeds particularly when reference ishad to the accompanying dra wingswherein;

Figure'l is a sectional view through atypical boiler showing a blower element associat ed, therewith igur 9 line 2 2 of Figure 1 Figure 3 is an elevational view of a blovw er element constructed in accordancei with ourinvention; H e Figure 4 is a sectlonal v'ew through the blower element taken on thelinee ofiFigure 3; and s Figure 5 is a sectional view similarto Fig-e ure 4 showingjarslightly modified formflof blower element.

r Referring now more particularly to the drawings wherein like reference characters designate corresponding partsthroughoutall. VieWsof the same, the reference character 10] designates a boil-er'of .usualconstruction and provided with tllfl'bOllGl tubes 11.

Forthe purposes of cleaning of the boileig there are pr'ovidedthe blower elements 12 whichf r elements are arranged at suitably spacedj points within the boiler being s'upported in any desired manner, as

.for example by the bearings 13,.T'Th'e blower elements 12 may bemounted for rotation in aflsuitable head designated generallyby the reference characterl lfand may be supplied "with'cleani'ngfiuid through a-suitablesupply is a section aliview V y I p i ful blower tube must'possess, is that its sur thisisof usualconstruction a and forms nopart of the presentfinvention.

rigidity, under the'extremely high temperatures which are maintained 'atthesel'c'ertain locations within theboil er; to satisfactorily resist the mechanical strains to which the blowerelement is subjected in service The body of the'element must be'elasticfor tough andyet it must not sag betweenjits points of support when it, is highly heated. Further,

the bodyioffth'e' element must bepossessed of in" certainlocations of'the blowerelements.

alhi'glrtensile strength i and must be capable.

r ng high] te p tur f ser riods of time; and be capable of resisting sud den changes in temperatureysince' inoperas tron when thejfclean ng fiu d 1s adm tted to these tubes "their temperatures are rapidly "lowered by'af considerable' amount;

The second characteristic which successface be'thoroughly resistant to the :fabrasive and scouring-"action of the furnace gases; and

V ash incident to the operation ofthe boiler.

The surface of these elements mustfbe in capable of reacting with the'chemic'alfcom -stituents of the furnace gases and must be particularly resistant to the action of sulphur which is contained in conslderable amounts in thefu'rnace gases and ash.

Certain materials possess the first above mentioned characteristics to a .liigh degree butdo notpossess the othercharacter J i ufacture ofthe blower-elements? Otherima istic in asufiici'ent degree to renderf-them thoroughly efficient and practical in the man- .9 terials possess the second characteristicfto a "high degree but'clo not possess the first char acteristic tOLSLlCll ,ahigh degree; ()ur inven- I tion therefore consists informingthe blower element with: a body portioniformed of a material possessing the requisite character.

istics of the body of the, element and in coveringthis body portion with a protective surface formedof a material possessing-the second characteristlc above outlined. a

More particularly we have found that the 7 of the first mentioned characteristic.

- 1 c]: cent Nickel approximately -1 96 Manganese approximately 4 As a second. example we may form the body portion of the blower element of a nickel chromium iron alloy.. Herealso it is obvious that the proportions of the alloying metals may be varied to meet different requirements although we have found that when these metals are alloyedin the following proportions, theyforma material which is thoroughly efficient in use. 7

Per cent Nickel 20 to 30 Chromium 15 to 2 Iron balance. Y

e have found that when the body of the blower element is formed of'either of the above alloys, it possesses extremely high structural rigidity under the high temperatures to which it is subjected within the boiler. Further the body of the element when formed of eitherof these-alloys is suflicient'ly malleable to resist sudden changes in temperature and 'to' resist the mechanical strains to which the blower element is subjected. in operation- For the surface of the blower element, we prefer to use a chrome iron alloy and these metals may be alloyed in any one of the three following proportions:

' Y 1 Percent Chromium 11 to 1 1- Carbon less than preferably under Silicon less than .50

Manganese less than .50

Sulphur less than .045

Phosphorus less than .045

'Iron balance. j

p 2 a Per cent Chromium"; 16 to 19 Carbon less than 25% preferably under .10 Silicon .5 to 2.0%; preferably .7 5 to 1.25 Manganese less than .50 Sulphur less than .0 15 Phosphorus less than s -i Iron balance.

Per cent Carbon less than 50% preferably under .25 Silicon less than .50 Manganese less than .50 Sulphur less than .045 Phosphorus less than Iron balance.

We have found that when the surface of the; blower element is formed of an alloy of chromium and iron in any of the proportions above specified, it will thoroughly resist the abrasive and scouring action of the furnace gases and ash incident to the operation of the boiler and will be particularly resistant to sulphur Igases. Further the surface formed ofthis alloy-possesses a high resistance to oxidation at high temperatures and is sufficientl'y malleable toresistthe sudden temperature changesto which, as brought out before, the blower element is subjected.

' The selection'jofthe alloy tobe used for the body of the element as well asthe selection of the particular'proportions to be usedin the alloy for the surface of the element will be dependent upon the particular requirements of each installation. The. alloys will be selected in accordance with the degree of malleability desired and the proportion of the ingredients in the two alloys may be varied to so reconcile the co-eflicients of expansion of the two alloys that the composite tube will not be ruptured during its service. While we have suggested certain 'desired proportions in the alloys, it is obvious that many changes may be made to meet many different particular requirements.

In forming the tube of the several materials above mentioned, we may first form the innertube' or body portion 16 of the element 12 of relatively thick-walled material containing the metals specified, namely either nickel and manganese or nickel chromium and iron. The surface 17 of element 12 may then be formed of relatively thin material containing chromium and iron in the proportions desired and either shrunk or driven onto the body portion 16 of the element. The particular method of forming the composite element is not material since many methods known to those skilled in the art may be used.

'After forming the composite tube or element the same may be drilled as at 18 for I the reception of suitable nozzles 19.

i As shown in Figure 4 of the drawings these nozzles 19 may have a body portion formed of one'alloy and a surface formed of a second alloy similar to the element itself. If desired, however, the nozzle may be formed of a: single material as illustrated in Figure 5 of the drawings and designated by the reference character 19. If the nozzle is made of a single material,.we prefer to make the same of the chrome iron alloy having thesame pro portions as the surface of the blower element sired. r

' From the above, it will be apparent that we have formed a bloweraelement which will efficiently withstand'the hard usage to which the same is naturallysubjected during the.

operation of the boiler. That portion ofythe blower element, which is particularly subi "chromium from '11 to 30' per cent and iron jected to the chemical action'of the furnace formed of an alloy containing chromium gases, possesses those characteristics by which it may most efficientlyfwithstand this chemical action while that portion of the blower element which must resist the strain incident to the heating and cooling of the element and the. turning ofthe same during operation (if a rotatable blower element is used) possesses those characteristics which will most successfully resist these strains. I

While we have described with some particularity the preferred forms which our invention may assume, it is to be understood that the embodiments described are an the purpose of'illustration only and are not to be construed as definite of the limits to which our inventive idea may be put. We therefore reserve the right to make such changes in the 7'. A soot blower cleaner tube having an i I outer surface formed of an iron chromium alloy and aninner body portion formed of a nickel chromiumalloy. I T

8. A soot blower cleaner tubehaving' an outer surface formed of an iron chromium alloy and an innerbody portion formed of an alloy, containing nickel20 to 30 per cent and chromium 15-to 25 percent.

9. A soot blower cleaner tube havingan' outer'surface formed of an alloy containlng from68 to 88 percent and having abody -portion formedof nickel 20 to 30 per cent, chromium 15 to 25 percent and iron balance.

In testimony whereof I afiix my signature. I r SAMUEL F. COX;

In testimony whereof I aflix my signature.

. NORMA-N "L; SNOW. I

details of construction as will fall within the purview of the attached claims.

l/Vhat we claim as our invention is:

1. In a soot blower cleaner tube, a body portion formed of an alloy containingnickel, 5 and a protective surface on said body portion formed of an alloy free. from nickel.

2. A soot blower cleaner tube having a body portion formed of analloy containing substantial quantities of nickel and having an outer surface formed of an iron chromium alloy.

3. A soot blower cleaner tube having a body portion formed of an alloy containingover 20 per cent'nickel and having an outersurface formed of analloy containing substan-.

tialquantities of chromium and iron.

4. A soot blower cleaner tube having a body portion formed of an alloy containing substantial quantitiesof nickel and having an outer surface formed. of an alloy containing over 11 per cent chromium an'd'o'v'er 50 per cent iron. I l

5. A soot blower cleaner tube having a body 1 formed of an alloy containing substantial from 11 to 30 per cent and iron from 68 to 88 per cent.

' r 6. A soot blower cleaner tube having a body ofsaid alloys containing substantialquantities of chromium and'iron and being free from nickel. Y

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