US1986669A - Furnace - Google Patents

Description

Jan 1 "1935 R. LQIGODSFIIALK :1- AL 1,986,669

FURNACE Filed Nov. 16, 1931 '3 Sheets-Sheet 1 lNVENTORS P1155811 L. Gods/181k Size/Jen berger OREY 1935. R. L. GODSHALK n AL 1,986,669

FURNACE Filed NOV. 16, 1951 3 Sheets-Sheet 2 INVENTOR Russell L. Gods/1a 1k Rolfe J/iellenberger BY heir TTORNEY K Jain. 1, 11935.

R. GODSHALK E'i' AL FURNACE Filed Nov. 16, 1931 3 Sheets-Sheet 5 INVENTORS Russell L Godsha/k Rolfe Shel/en berger BY their ZZTTORNEY v V I M the following specification.

' of Fig. 3, and

Patented Jan. 1, 1935 Russell L. Godshalk, New York, N. Y., and Rolfe Shellenberger, Westfield, N. J., assignors to Fuller Lehigh Company, New York, N. Y., a, cornotation of Delaware Application November 16, 1931, Serial No. 575,260

4 Claims. (01. 122-235) V My invention relates to a furnace and particularly to apparatus used for cooling parts of a.

furnace structure.

One object of the invention is the provision of means for cooling a furnace floor which will operate in a more satisfactory manner than has heretofore been provision of such celerated now of cooling liquid may be produced. A further object is the provision of means for controlling the rate at which the furnace floor is cooled. Other objects will be apparent from The invention is shown by way of illustration in the accompanying drawings, in which Figure l is a vertical sectionthrough a furnace embodying the invention.

Fig. 2 is a horizontal section on the line III-II of Fig. 1,

Fig. 3 is a fragmental section showing the lower left hand corner of Fig. 1 on an enlarged scale. s

Fig. 4 is a vertical section on the line IV-IV of Fig. '3,

Fig. 5 is a horizontal section on Fig, 6 is a vertical section through the boiler drum shown in Fig. 1 on an enlarged scale.

Inthe drawings there is shown afurnace 10 having a boiler 11 above it. The furnace here illustrated is a furnace adapted to burn pulverized fuel and to accumulate slag on its floor. The boiler has a steam and water drum 12 constructed and arranged in the usual manner. The furnace walls 13 and 14 have cooling tubes 15 and 16 respectively therein. There is a furnace floor 1'7 at the bottom of the furnace, and cooling tubes 18 are provided in the floor 1'1. The floor tubes 18 are connected with pipes 19 and 20 which lead toand from the steam and water drum 12 of the boiler: Thus the pipe 20 is connected with the' water side of the drum 12 and carries water downwardly and to the lower end of the floor tubes 18 and the pipe 19 carries water or steam or both to the steam side of the drum 12. In this way means are provided for passing a fluid through the floor tubes.

The floor 17 preferably slopes upward in the direction of cooling fluid travel through it. A box header 21'isconnected to the lower or intake ends of the floor tubes, and a box header 22 is connected to the upper or outlet ends of the floor tubes 18. The-upper ends of the tubes are preferably swaged, as at 23, in order that the fioor tubes may pass outwardly of the furnace possible. Another object is the an apparatus wherein an acthe line V-V- between the wall tubes 15, and the tubes 18 may be bent slightly upward adjacent the swaged As will be seen from the drawings, the riser is connected to the floor tubes by means 'of the box header 22 and passes between the wall tubes into the furnace above the box header extending upwardly within the furnace as shown-at 1911. again passing out of the furnace between the wall tubes 15 to a second box header 24, whence it continues to the steam side of the boiler drum 12 as previously described. By passing upwardly within the furnace, the riser absorbs heat from the furnace and thereby accelerates circulation through the floor cooling system. It' will thus be seen that by means of the riser sectlon'19a, ,.within the furnace heat is given the independent circulation rystem through. the floor tubes '18 as soon as the furnace is started. This is done in spite of any accumulation of slag upon the floor which may have solidified after shut down of the furnace, and which may prevent the transfer of heat to the floor tubes 18 themselves for an appreciable interval after the furnace is started.

' Thus circulation in the wall tubes and floor tubes is started simultaneously, which gives better operating'results and prevents water hammer and the possible local formation of steam in the floor tubes beneath thin sections of the floor or cracks therein.

As shown in Fig. 2, only a limited number of riser connections may lie for a portion of their length within the furnace, andas here shown these elements are dispwed in the corners of the furnace where the most intense heat will not be encountered. i

By increasing or decreasing the number of riser connections extending within the furnace, the rate at which the furnace floor is cooled may be controlled. Additional controlmay be effected by applying va refractory covering 25 to this section of the riser tubes, one method of applying this covering being illustrated particularly in .Fig.

5 wherein moldable refractory is held in place by'means of pins welded upon the, tubes. Other well known or convenient methods of holding this refractory covering in'place may obviously be substituted for the one here particularly illustrated.

It is desirable to have the riser connections 19 in the boiler drum 12 soyformed as to make it easy for the floor cooling system to begin its operation. For this reason a'slot may be provided in the end of the tubej19 within the drum -12. This slot is constructed to extend below the 12. Before the fire is water circulating syswater level in the drum started the wall and floor tem is full of cold water.

According to the present inventionmeans is, therefore, provided in the form of the riser section 19a within the furnace, whereby heatis absorbed by the circulation system and circulation of the cooling fluid is induced regardless of the layer of slag which may insulate the floor tubes. This means isprovided in the riser tubes of the circulation system where accelerated circulation can most easily be produced. By providing a slot in the end of the riser tube which extends below the water, assurance is given that no additional head of cooling fluid within the riser-tubes will obstruct the easy flow of the cooling fluid.

It is realized that other forms of the invention differing from the specific description here given,. but coming within the proper scope of the appended claims, will readily suggest themselves to those familiar with the boiler and furnace art. For example, the pipes 19 and 20 which lead cooling fluid from and supply cooling -fluid to the fioor tubes 18 need not be connected directly to the boiler drum, .but maybe otherwise connected to the furnace cooling system. The disclosure here given is merely made by way of illustrating how the invention may be applied' With this understanding, we claim 1. Ina furnace, wall tubes, floor tubes extending outside of the furnace between said wall tubes, means for passing a cooling fluid through said floor tubes in combination with a header connecting all of said fioor tubes outside of the furnace, and a riser connected to-said header extending upwardly outside of said furnace, passing between said wall tubes and extending upwardly inside the furnace; and passing outwardlybethe riser'section within the furnace absorbingheat and accelerating circulation of the cooling fluid through the floor tubes.

2.IIn a furnace, wall tubes,

a header beyond said wall tubes outside of the furnace, floor tubes,

the ends of said floor tubes of the furnace between said wall passing outwardly tubes and being connected to said header, and riser tubes connected to said header, said riser tubes passing between said wall tubes into the furnace above said header, extending upwardly within the furnace, and again passing out of the furnace between said wall tubes.

3. In a furnace, a floor, wall tubes surrounding and definingthe limits of said floor, circulation systems including said wall tubes for passing a cooling fluid through said wall tubes, tubes in said floor and a separate circulation system including said floor tubes, for passing a cooling fluid through said floor tubes, in combination with a riser connected with said floor tubes in said separate circulation system, said riser passing from without the furnace the furnace between adjacent wall tubes within and'then again passing without the furnace through adjacent wall'tubes.

4; In a furnace, the combination of side walls and a floor defining a combustion chamber, thefloor being constructed to supporta relatively thick layer of slag thereon,

the burning of a slag forming fuel in suspension within the furnace, a fluid, circulating system heated thereby and including substantially horizontally extending tubes "and surmounted by a thick layer of slag, the latdisposed in the floor eral disposition of the floor tubes and the slag covering contributing to. circulation,

a relatively slow rate of the fluid circulating system also including downcomers supplying liquid to the floor tubes and upcomers conducting fluid away from the floor tubes, the upcomers being so constructed that at least a portion thereof is disposed within the combustion chamber and above the highest level of slag whereby heated and therate of the upcomers are highly circulation of fluid is augmented to at least offset the effect of the lateral disposition ering.

of the floor tubes with the slagcov- RnssELn L. GODSHALK.

ROLFE SI-IEILENBERGER.\-;

means providing 'for

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