USRE7916E - Improvement in boiler-cleaners - Google Patents

Description

UNITED STATES PATENT OFFICE THOMAS O. KEMP, OF BIJAAMSVILLE, ONTARIO, CANADA, ASSIGNOR 'llOv JAMES F. HOTCHKISS, OF BAY CITY, MICHIGAN.Y

IMPROVEMENT IN BOI'LER-CLEANERS.

Specification forming part of Letters Patent No. 166,782, dated August17,'l875; Reissue No. 7,916, dated October 16,1877; application iiledeptember 22, 1877.

KEMP, of Beamsville, Canada, have invented' certain Improvements'in Boiler-Cleaners, of

which the following is a specification, reference being had to the accompanying drawln gs, and tothe letters of reference marked thereon.

My inventionA consists in an improved method of removing impurities or foreign mat tersrfound in the water of steamboilers, and which are thrown to the surface by the ebullition thereof,"together lwith the mechanical appliances for carrying said method into eiect, as hereinafter described.

The operationvof thisinvention is dependent upon the action of the laws of gravity as applied to waters of different temperatures, and to substances of different specific gravities; andithese well-known laws, bythe construction and arrangement of the parts herein described, are, as I believe, utilized for the pur.-v poses designated to an extent heretofore unknown.

The method employed consists 'in carrying the impurities raised to the surface by ebullition below that surface, and then upward into a reservoir, with an ascending current induced .by the displacement of a descending cooler body of water passing from said reservoir, the said impurities being deposited inthe reservoir by precipitation.

In the accompanying drawings, forming a part hereof, Figure 1 is a longitudinal sectionJ of a boiler havingmy improved cleaning ap-l paratus applied thereto. Fig. 2 is a cross-sec- -tion on line .z' y.

Similar letters of reference indicate similar parts of the invention in both the views.

' level of the water. The pipe C, where it passes through the shell of the boiler, is suitably fastened thereto. The horizontal member .of the pipe l(l is secured to one end of the reservoir B, and is supplied with a cock, e. Similarly attached to `the reservoir, at the other end thereof', is another pipe C', the horizontal sectionof which is provided with a cock, f, the vertical section passing through the shell of the boiler, andbeing secured thereto. Theend of the said pipe extends into the boilerfwater a little below the lowest levell thereof and the end of the pipe C.

It is a rudimentary principle in the art of steamengineering that in a boiler under pressure all of the interior parts thereof,land all exterior chambers or recipients incommunication therewith, are subjected, practically, to-the same pressure. Thus, in the present case, communication being established between the boiler A and reservoir B, the water forced into said reservoir is subject to a pressure common to both it and the boiler-water, and as long as its densityv and specific gravity remain the same as thoseof the water in the boiler, consequent upon equal temperature,) there be an equilibriumestablished in the boiler, reservoir, and pipes, andl no circulatory motion through the same will occur. But, as a body of water removed from actual contactwith the greater body of heated water in the boiler, the reservoir-Water begins to cool, and gathering density in cooling overcomes the equilibrium established and commencestodescend the pipe C. At the same moment the bellmouths of the pipe C admit aniniowing 11pward column of water, which seeks to again establish the former equal condition and the circulation, once begun, will continue indefinitely.- As the impurities are thrown to the water-level 'by ebullition .they are received within the bell-mouths d, and carriedbelow the water-level, up the pi'peC, and deposited in the reservoir B. It will be observed that as the horizontal member of the Tto which the' bell-mouths lead is below the surface, no steam can enter said pipe and be carried to the reservoir. This construction constitutes an effective steamltrap. The fall of the temperature of the water holding the impurities insuspension causes them to be precipitated to the `bottom ofthe reservoir, and the water returned to the boileris practically clear.

The circulation of the water through the boiler, reservoir, and pipes may be inuagurated by closing all communication between the boiler and reservoir after the latter is filled with Water by pressure, by closing the cocks in the pipes C C' and allowing the reservoirwater to cool rapidly, when the .cocks wouldA be again opened.

The impurities may be removed from the reservoir by blowing them through the pipe c, the cock d being opened for the purpose, or they may be extracted through the cleaningopening b, the cover b( being removed.V

In addition to the afore-named results at- 'tained by the use of the bell-mouths d, they allow the ordinary rise and fall of the waterlevel without admitting steam to the reservoir. Then, the pipe C' for the descending colunln of water, terminating just below Athe water-level, is at all times removed from Athe heavier sediment or scale, which settles at the lower parts of the boiler. and around its sides, and the iniiowing of the return clurent tir the boiler is never obstructed by such deposit. y

I am aware that it is not new in steam-boil ers to. make the water circulate from the boiler to a mud-drum and awater-leg in the vicinity of the furnace; bu-t V Having described ,my invention, `what I claim as new, and wish to secure by Letters Patent of the UnitedStates, is-

1. The method of collecting impurities from the water-level of steam-boilers, raised thereto by ebullition, by carrying them beneathjsaid level andupward into a reservoir Withan cending current ,induced by `the displacement of a lcooler body of water in said reservoir, and depositing,I the impurities therein by precipitation, substantially as specified.

2. As an element in av sediment-collector for steam-boilers, a pipe for the ascending current,-

suspended within the boiler, in combination with and terminating in a submerged inletpipe, having mouthsextending to the waterlevel, and forming a steam-trap, substantially .as described. n l

3. In a sediment-collector, bell-mouths suspended within the boiler at the water-level, and leading to a submerged pipe, and an ascending pipe combined with a reservoir, and a descend'hig pipe extending within theboiler,

and reaching just below the Water-level, sub-' .stantially as and for the purposes described. e

for the upward current, carrying the sediment, combined with a reservoir and .a return-pipe leading from the same to the boiler-water, the whole forming` a means Vof circulation for the boiler-Water, and ibrremovingimpurities therafrom, substantially as herein set forth.

In testimony'whereof I have hereto subscribed my name, in the presence of two subscribing witnesses, this 4th day of September, A. D. 187 7. 1

' THOMAS OXBORROW KEMP.

Witnesses:

GEO. A. SKINNER,

THOMAS E. Hints.

Images