US1919203A - Furnace - Google Patents

Description

July 25, 1933.

J. G. COUTANT FURNACE Filed Feb. 23, 1929 INVENTOR:

ATTORNEYS.

Patented July 25, 1933 "*hmhh STATES mm or-m: i

, JAY GOULD courim'r, or NEW YORK, N. YL, AssIeNon 'ro FURNACE Emmmmm oom- IPANY, INC, on NEW YORK, N51, coRronATIoN OF NEW YORK i FURNACE Application filed February 23, 1 929. SerialiNo. 342,039.

I This invention relates to furnaces, its chief utility being inrespect to furnaces for heating steam boilers,.and particularly furnaces fired with pulverized coal or similar. fuel;

The general objects of the present invention include the general improvement in the efli ciency of firing of furnaces, while increasing the thoroughness' ofcombustion,.;rate of evaporation and the-durability and economy of operation ofthefurnace. Further objects.

and advantages of the present inventionwill be explained in the hereinafter following description or illustrative embodiments thereof or willbe apparent to those conver- To the attainment of line m-m of Fig. 1, showingthe relation, in

thewater arch, ofthe tubes and the closing wall'members. 1 1

.Figs; 4 to? are corresponding cross sections" showing four other 1 different. structural modifications.

This application is claimed to bea con'- tinuation in part of my prior application filed March 5, 1925, upon which patent isabout to issue on February 26,1929, No.1,703,814, and

of my copending applications Serial No.

60,435, filed October 5,1925 and Serial No. 176,137, filed :March 17,1927. y v [In the prior patent the. fuel is shown in Fig. 4 as being introduced at the left side of w the chamber beneath awater cooled, arch.

The fuel is in the form of pulverized coal in suspension in air, forming a flame directed into the combustion chamber, this ..flame entering the chamber between cooling surfaces bothabove and below, namely the water arch above and a water cooled floor orbottom below.- Figs. 2 to? hereof correspond substantially with Figs. .to-14 of the prior ash chamber or pit.

patent. The formof burner or pulverized fuel injector as herein shown does notcorrespond with the form shown in the prior pata ent, but corresponds with that shownin an other prior application of mine, although either burner, or other burner could be employed in the same relation.

The furnace is a boiler furnace and isshown as enclosed between a front wall 10 and side walls. .11, and an opposite rearor bridge wall will be understood. The'side 1 walls are of a type having water cooling tubes 12 in the upper pa'rt'of the chamber for progressive cooling of'the' gases ascend- I ingvtoward the boiler. Below is the water bottolnor floor 13 shownas comprising wavter 'circulation'jtubes 14; for" the cooling of the'flOor; As in the 'priorpatent thewater bottom is inclined andis provided with'jets' 15 for drivingsettledj ashes downwardlyinto the ash discharge pe n 6l d p In the-front wall 10 is shown aburneri 18; which may be considered asrepresentativef of aseries of, burners arranged along one or more walls. The burner may be of various types, but is shown of a type describ d' a prior application wherein areja system of pension in airfor delivery laterally into the tubes 19 bringing the pulverized coal in-sus- I burner anda nozzle 20 at the outer end'for f delivering, forced draft air longitudinally into the burner. The combustion starts withe in the chamber 21 of the burner and theflamei is delivered atthelm'outh or delivery" point laterally into the combustion chamber of the, furnace.

Above thecombustion chamber-is shown a. water tubeboile ri24 having bafiles 25 of a i J usual sore, Between these and the front wall l.0-is shownaniarch '26 and for the purposesof this invention this arc'h,.which is arranged radiant heat,; is provided with water-circulm. tionpassagesor tubes .27 arranged for high the fuel admission point, and exposedto the. 1

a5 a heat absorption. n willibe, noted that the;

arch'26 is-slantedupwardlyawayirom'tM wall through which the fuel isadmittedand the bottom 13 is slantedidownward-ly; away from the same wall, so that in efi'ect thefuel V is injected into the water cooled flaring side or extension of the general combustion chamber.

The water tubes 27 of the arch are shownv as supplied with Water by a downtake pipe 28 leading from the boiler to the lower header 29, the water passing thencethrough the system of arch tubes 27 and from them into the upper header 30. From this upper header preferably take-ofla system of widely spaced tubes 30 forming a slag screen subto'ry flanges.

2t 32 'between the tubes. An outer refractory layer-33 is shown, which of course may also be employed in Fig. 2 or 4. I

' The blocks 31 and 31 and their depending flanges are preferably composed of 'firebrick. refractory. Thus the radiant heat is directed toward the tubes 27 and toward the refrac- The flanges "protect the tubes from excessive heating and'destruction. The flanges also prevent excessive absorption of radiant'heat and thus maintain a suitably high flame temperature at the delivery of theburner. The circulation tubes in turn' protect the refractory elements and preserve the arch from destruction, while greatly enhancing the total evaporation, and preventing the ill effects of excessively'high flame temperatures. r I

Fig.4'is similar to Fig. 3,.but with the depending flanges of the blocks 35 cut off to expose the tubes substantially to their diameters. y

In any of these constructions, the interposed'blocks might insome cases be con structed partly'or wholly of metal, or the tubes .might be faced with metal, or other I high heat conducting material, but as stated the preferred arch presents a'combined surface of refractory material and water cooled tubes to the radiant heat. 7 :In Fig 5 the depending blocks 36 may be composed ofmetal and give dove-tail support to silicon carbide blocks 37, representative of any high heat conducting refractory block. In this case the blocks are arranged substantially to cover and protect the tubes, but to deliver effectively the absorbed heat to the circulating medium. The block 36 is shown supported from a backing 38.

' In Fig. 6 the blocks 4:0 are ofmetal, but otherwise similar to the blocks 37 in Fig; 5. The blocks 40 are. secured by a' clamping device 41 with a rear metal bar 42 below abacking 43. -InFig. 7 the construction issimilar but the metal block 40 is providedwith a silicon carbide face insert 45.

The operation has been largely indicated.

The burners deliver 'the flames laterally or horizontally into the general chamber. They sweep across the chamber and then swing up through the temperature reducing zonesurrounded by the tubes 12, and thence between the tubes of the slag screen 30 and into the boiler passes. With this invention the progressive cooling of the flames commences shortly beyond the exit of the burners due to the radiant heat absorbing surfaces or waterarch and bottom above and below the flames.

Complete combustion is assured by the high initial temperature while slagging crease evaporation and cooperates in the com- 7 bustion operations. In the case of injected fuel the water arch cooperates with the water bottombeneath as already described.

There has thus been described a furn'ace embodying the principles and. attaining the advantages of the present invention, being illustratively shown as a boiler furnace burning pulverized coal. Since many matters of operation, combination, arrangement and construction may be variously modified with out departing from the principles, the invention is not intendedto be limited to such matters except to the extent set forth in the appended claims.

What is claimed is: I

1. In a pulverized fuel boiler furnace having a combustion chamber in which the boiler is exposed, a burner admitting fuel and'air in a lateral direction through a lateral wall of the chamber, an arch above the burner exposed to the radiant heat, a bottom wall below the burner exposed to the radiant heat, said arch andbottom being arranged'to 'diverge in the direction of fuel admission, and water circulating tubes in both said-arch and bottom, in circulation with the boiler.

2. In a boiler furnace having a com ustion chamber, a burner admitting fuel through one of the lateral walls of the chamber, an arch ther'eabove exposed to the radiant heat, said arch having water circulation passages arranged for high heat absorption, a slag screen of spaced water tubes across the upper part of the furnace, and

connections between the water circulation.

passages and the slag screen tubes-soarranged that the'circulation passages deliver to said slag screen.

3. A pulverized fuel boiler furnace comprising, walls. constituting a combustion chamber belowthe boiler, an arch,a=w'ater cooled bottom, a screen of widely-spaced water tubes between the combustion zone and 1 said injecting means exposedto the radiant heat, and having spaced water circulation tubes arranged for radiant, heat absorption; 1

said arch being inclined upwardly away'iron the fuel injection point, and a closedfurna'ce bottom inclineddownwardly away from the fuel injection point and havingwater circu- 1 lation passages "for absorption of radiant heat, I p V JAY GOULD COUIANT.

Images