US1809097A - Steam generator - Google Patents

Description

W. R. woon STEAM GENERATOR June 9,- 1931 Filed July 24, 1928 i Patented June 9", 1931 I uNI'r-rzo STATES PATENT. OFFICE WILFRED R. woon, OE LONDON, ENGLAND, AssIGNOR To INTERNATIONAL COMBUS- TION ENGINEERING CORPORATION, OE NEW YORK, N. Y., A CORPORATION OE DELA- 'WARE STEAM GENERATOR Application filed July 24, 1928. Serial N0.'294,976.

This invention relates to certain improvements in steam generators and is particularly useful in boiler furnaces, i. e. in steam generators having furnace walls lined with radiant heat steam evaporating tubes arranged to deliver their steam to a steam and Y water drum.

radiant heat tubes and to their multiplicity there is considerable turbulence in the steam and water drum which results in priming and consequent wet steam which is objectionable.

One oflthe objects of my invention is to overcome this objection.

More specificallyv stated it is an object of my invention to provide drum means so constructed and arranged that the contents of such vmeans is substantially segregated into portions whereby I am enabled to take off dry steam from a portion in which objectionable turbulence does not take place.

Another object of'my invention is to 'provide interconnected steam and water drums to .which the steam generated under conditions producing considerable turbulence is delivered and to provide such drums with A chambers thru which the steam successively passes and' to provide steam oitake means s. for a chamber or chambers in which no appreciable turbulence takes place.

How the foregoing together with such other objects and advantages as may hereinafter appear, or are incident to my invention, are realized is illustrated in preferred form in .the accompanying drawing, wherein: y

figure is a sectional elevatlon` of 'a In the particular installation shown the' combustion space A is defined by tubular side walls 2, 2, front and rear tubular walls, the rear wally 3 only appearing in the drawing, and the top or roof inclined tubular wall 4. A plurality of inclined tubes also extend across kthe bottom of the combustion space, it being preferable to arrange the bottom Atubes in a bank as indicated at 5.

The side wall tubes are connected at their lower ends into headers 6 and at their upper ends into headers 7, the lower headers 6 being connected into a lower header or drum of the front wall tubes (not shown) and the upper headers 7 being connected into the steam and water drum 8. The rear Wall tubes are connected at their lower ends into the drum 9 and at their upper ends into the steam and water drum 8. The roof tubes 4 are connected at one end into an upper header or drum of the front wall tubes (not shown) and at the other end into the steam and water drum 8. The bank of tubes 5 are connected at one end into the lower drum of the front i 'space ofthe drum 8 to the lower drum of the front wall tubes. It will thus be seen that thel circulation in the water tubes of the wall and inthe inclined tubeslandis in an upward direction, the steam generated being delivered to the steam and water drum 8.

Fuel such as pulver-ized coal, is introduced into the combustion chamber A by means of a plurality of burners 11 preferably located at the corners of the combustion chamber and disposed so as to deliver their streams tangentially to a circle havingits centre inl the axial line of the chamber. Air, preferably preheated air, is introduced with the fuel as indicated at 12. The particular furnacev illustrated is a down-draft one in which the violent swirling fuel and flame stream descends and sweeps over the tubes hereinbefore mentioned, the products of combustion passing between the tubes of the bank of tubes 5 and passing to a rear outlet.

The steam and water drum 8 receives theN steam discharging from the tubes of the rear wall 3, the upper headers 7 of the side water walls, and the root` tubes 4. Due to the rapidity of circulation in the tubes thereis a great deal of turbulence in the water space of the drum into which the tubes deliver, which turbulence, as above pointed out, gives rise to priming and results in there being a good deal of water with the steam in the steam space, in consequence of which troubles develop from wet steam if the steam is drawn directlyv from the steam space above the tubes in the usual manner.

I aim to overcome such difficulties by providing bafies 13 and 14 which divide the drum 8 into three communicating spaces or compartments a, b and c. The baiies are illustrated as being formed of a plurality of transverse plates arranged in louvre-like fashion, the spacing and inclination being such that steam passes from the space b to spaces a and c in a downward direction which causes a change in the direction of travel of the steam. These baffles are so arranged with respect to the headers 7, the roof tubes 4 and theKtubes of the wall 3,that the turbulence hereirbef fore mentioned is confined to the space b which is intermediate the end rspaces a and c, there being no steam led to the endspaces other than that passing through the baiiles.

Since there is no delivery of steam and water from the steam generating elements' into the water spaces immediately beneath said end steam spaces, turbulence in the compartments a and c is very substantially less than in the intermediatel compartment b and the steam having been subjected to a drying action by the change in direction, is very much drier in these end compartments.

Associated with the drum 8 and preferably located thereabove is a second drum 15 to whichsteam from the end chambers or compartments aand o of the' drum 8 is `led byv means ofpipes 16, 16, or other suitable connections. This drum 15 is also divided into communicating chambers or compartments,

preferably three, which are designated by the reference letters d, e and f. The drum is divided into these compartments by means of the `double bailles 17 and 18. The' baffles in this instance each are formed of two rows of transverse plates arranged in louvre-like fashion. y

The pipes orconnections 16, 16 are connected from the end compartments a and c of the drum 8 into the end compartments d and f of the drumk 15, there being no steam led to the intermediate compartment e other than that passing thru the balies 17 and'18."

It is to be notedI that the baie plates 19 are y ppostely inclined to the bale vplates 20, the

intermediate chamber takes a double change t of further a downcomers 23 for the intermediatev chamthe pipes 16, 16. The downcomers are preferably connected into the same lower drum into' which the downcomers 10 connect. As the -various downcomers lead water to the evaporating tubes from spaces in which no great turbulence takes place eiiective water delivery is ensured.

From the foregoing it will be seen that I have provided an arrangement whereby de fects in water tube boilers, particularly those` employing radiant heat evaporating wall tubes, are effectively overcome.

What I claim is 1. In combination a steam and water drum, louvre-like means for dividing said drum into communicating compartments, a plurality of substantially upright radiant heat evaporating tubes discharging into at least one compartment of said drum, a second drum; louvre-like means for dividing said second drum intoI communicating compartments, means for establishing communication between at least one compartment of the second drum and at least one compartment of the first drum whichdoes not directly receive the discharge of said tubes, and a steam outlet for at least one compartment of the second drum which is not directly in communication with the first drum.

2. The combination with a steam and water i drum and a plurality of steam generating elechambers, means for connecting the end chambers of the irst'drum to the end chambers ofthe second drum, and a steam outlet for the intermediate chamber of the second drum. Y

3. combination a steam and water drum, a plurality of substantially upright radiant heat evaporating tubes, means for dividing the interior of said drum into communicating compartments, said tubes being connected to discharge into a compartment of the steam and Water drum, a. second drum, meansfor dividing the interior of said drum into lcom- I municating compartments, means for establishing communication between a compartment of the first drum other than-the compartment receiving the discharge o said tubes and a compartment of the second drum,

and a steam outlet for another compartment of the second drum, the dividing means for said drums including p1ate-1ike-members arranged to cause the steam to change its direc-v tion in passing from one compartment to another.

n testimony signed my name.

WILFRED R. W001i).

exs

whereof I haue hereunto

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