US1802125A - Feed-water-heating device - Google Patents

Description

April 21, 1931. E. L. SCHELLENS 1,302,125

FEED WATER HEATING DEVICE I Filed Aug. 29. 1928 2 Sheets-Sheet. 1

INVENTOR ymolfkhmw April 21, 1931.

I E. L. SCHELLENS FEED WATER HEATING DEVICE Filed Aug. 29. 1928 2 Sheets-Sheet 2 INYENTOR W TTORNEYS Patented Apr. 21, 1931 UNITED STATES PATENT OFFICE EUGENE L. SCHELLENS, OF MILLBURN, NEW JERSEY, ASSIGNOR TO C-S ENGINEERING COMPANY, OF ENGLEWOOD, NEW JERSEY, A CORPORATION OF DELAWARE FEED-WATER-HEATING DEVICE Application filed August 29, 1928.

This invention relates to feed water heating devices for boilers and is especially useful in connection with locomotive feed water systems.

One of the primary objects of my invention is the provision of a simple and effective device for heating feed water as it is being introduced into the boiler.

Another of the primary objects of my invention resides in the provision of a feed water preheater which operates effectively to facilitate heat transfer therein.

Another object of my invention is the provision of a device adapted to be associated with the usual feed water heater of boilers which operates to raise the temperature of the feed water over the ordinary feed water temperatures.

Still another object resides in providing a device of the character described which operates to deliver the water into the boiler in a manner to prevent scale accumulation on the boiler tubes.

A more specific object is to provide a device for heating boiler feed water as it is introduced into the boiler which operates to deaerate the water.

Other objects have to do with certain features of construction of the device which will hereinafter appear.

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 drawings, where- Fig. 1 is a more or less diagrammatic broken-out side elevation of a locomotive with my invention shown applied thereto;

Fig. 2 is a cross section through the device and locomotive boiler with some of the boiler tubes omitted, the section being taken on the line 2-2 of Fig. 3; and

Fig. 3 is a fragmentary section taken on the line 33 of Fig. 2 with the boiler tubes omitted.

Referring to the drawings and more particularly to Fig. 1, it will be seen that the feed water system of the particular locomotive with which I have associated my device Serial No. 302,698.

comprises in general a feed water pump A, which takes feed water from the tender of the locomotive by means of a pipe 4; and delivers feed water to a feed water heater B, of any preferred type, by means of a pipe 5. From the feed water heater, the feed water is conducted, by means of a pipe 6, to a heating device C located on top of the boiler in a shell or casing c, the operation and construction of which will be hereinafter described.

The pump A is operated by steam led to it from a turret in the cab by a pipe 7 and the exhaust steam discharged from the pump is conducted to any suitable point by a pipe 8. Suitable control apparatus D is provided for the pump.

The particular feed water heater B illustratcd in the drawings is similar to the heater shown in copending application Serial No. 209,540, filed July 30, 1927, in which I am joint inventor with Christopher A. Schellens. The heater receives steam, preferably exhaust steam taken from the valve chests 9 of the 10- comotive, through the medium of the valve controlled pipe 10.

Reverting now to the heating device C and referring more particularly to Figs. 2 and 3 of the drawings, it will be seen that the device comprises a structure secured to the boiler at the top thereof which provides a chamber or dome E having steam and water inlets and outlets. In this instance the structure comprises an open bottomed casing 11 having a flange 12 for securing it to the boiler and a lower portion 13 extending into the boiler through an opening in the boiler shell 14. This casing is provided with a detachable cap or head 15, which head has a water inlet 16 and a steam outlet 17.

Associated with the water inlet 16 is a spray valve 18 of any conventional "type which sprays the water led to the inlet 16 by the pipe 6 hereinbefore referred to into the interior of the chamber E. Steam from the steam space of the boiler enters the chamber E though the opening 19 provided by means of an annular member 20, which member also provides a trough 21 in the chamber receiving the water sprayed into the chamber.

The chamber or dome E has suitable trays or battles 22 therein for providing a time ele ment for the water to pass through the dome or effective heating by the steam rising from the inlet 19 to the outlet 1? and also allows the escape of as many air bubbles as possible. Battles 23 and 24 are also provided in the dome.

From the. foregoing it will be seen that the water and steam take tortuous paths, so to speak, in their passage through the device and they pass through in counterfiew, the water flowing down and the steam up.

The water flows by gravity from the trough 21 into the boiler through the outlets 25 located in the lower portion 13 of the casing 11 and adjacent the trough.

l have as ciated chan; 2G with the water outlets 25, which open into the boiler at substantially the middle portion thereof. These channels are secured to the boiler shell 14 in any suitable manner, ant it will be seen that they guide the Water in a general downward direction to a point \vel below the top of the boiler and prevent the accumulati n of scale on the top of the boiler tubes. The normal circulation in the boiler will tend to draw the water to the lower part of the boiler and back to the mud ring, where the sludge can be drawn oil.

The channels 26 have a flattened portion at 27 and the lower portion 13 of the casing 11 is of such length as to engage this flattened portion.

In order to be enabled to readily remove the battles or trays 22 and the member 20 for cleaning or other purposes, I have sup ported them from the detachable head 15, as by means of the bolts 28. Suitable spacing sleeves 29 are employed to properly space the baffles and the trough-like member. It is to be noted that the member 20 engages the shelf or flat portion of the channels and that a slight clearance is provided between this member and the casing, the clearance being just sufficient to permit of ready re moval of the member through the casing.

The steam outlet 1'7 is piped oti to any desirable point of use and in this instance I have illustrated a pipe 30 leading to a turret 31 which may be provided with a plurality of taps 32 whereby connection may be made to lead the steam to useful steam consuming elements on the locomotive, such as auxiliaries of the locomotive, or to the locomotive superheater header. Again the steam may be introduced into the dry pipe of the locomotive or any convenient point on the saturated side of the superheater. In fact, with an oversize superheater it may be desirable to lead the steam into the cylinders. There will be sufiicient pressure drop through the dry pipe to draw the steam through the spray chamber in this case. Thus, a positive circulation is provided through the device which prevents the forming of air pockets therein and facilitates heat transfer in said device.

From the foregoing it will be seen that I have provided a device which operates to heat feed water to approximately boiler temperature before it actually enters the boiler, i. e., as it is being introduced. The device also operates as a de-aerator to remove oxygen in the feed water before it enters the boiler because, as the steam passes through the batties and through the spray, considerable oxygen is removed and is carried off through the steam outlet.

My invention also has the advantage that it raises the temperature of the feed water above the ordinary feed temperaturesas much as 200 degrees, or more, relieving the boiler of expansion stresses.

It is pointed out that in locomotive feed water systems there is always a possibility of running the feed pump with the locomotive throttle closed, in which case cold water is pumped into the boiler. This has a very bad effect on the boiler and causes high maintenance due to leaking tubes, stay bolts, etc. Through the practice of my invention such difficulties are overcome because the device C effectively heats the feed Water even if the Water leaving the usual feed Water heater is cold.

I claim 1. In a heater of the character described, the combination of a casing adapted to be secured to a locomotive boiler, said casing having an open bottom adapted to be in communication with the boiler, a detachable cover member having a water inlet and a steam outlet. a spray valve carried by said cover member for delivering the water from said inlet into said casing, and a series of superimposed baffling members suspended from said cover in spaced relation, said baffling members being removable as a unit upwardly through said casing when said cover is; removed.

2. In a heater of the character described, the combination of a casing adapted to be secured to a locomotive boiler, said casing having an open bottom adapted to be in communication with the boiler, a detachable cover member having a water inlet and a steam outlet, a spray valve carried by said cover member for delivering the Water from said inlet into said casing, and a series of superimposed battling members suspended from said cover in spaced relation, said cover, said spray valve, and said baflles all constituting a readily detachable and removable unit.

A device for heating boiler feed Water as it is introduced into the boiler including a ca secured to the boiler at the upper part thereof, said casing having an open bottom establishing communication between its interior and the interior of the boiler, and a detachable upper portion provided with a water inlet and a steam outlet; 3. member associated With the casing at its open bottom providing an inlet to the casing for boiler steam and a Water trough for the feed Water; tray-like members in said casing located between the aforesaid member and the Water inlet; and Water outlets in said casing adjacent the Water trough through which Water H from the trough discharges into the boiler; and means for supporting said trough and trays from the detachable upper portion of the casing.

In testimony whereof I have hereunto signed my name.

EUGENE L. SCHELLENS.

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